U.S. patent application number 13/702363 was filed with the patent office on 2013-03-28 for electric construction machine.
This patent application is currently assigned to HITACHI CONSTRUCTION MACHINERY CO., LTD.. The applicant listed for this patent is Akira Noguchi, Masayuki Yunoue. Invention is credited to Akira Noguchi, Masayuki Yunoue.
Application Number | 20130078071 13/702363 |
Document ID | / |
Family ID | 45348092 |
Filed Date | 2013-03-28 |
United States Patent
Application |
20130078071 |
Kind Code |
A1 |
Noguchi; Akira ; et
al. |
March 28, 2013 |
ELECTRIC CONSTRUCTION MACHINE
Abstract
An electric construction machine that enables quick and easy
replacement of the battery device with different types of battery
devices is provided. An upper swing structure has a vehicle main
body and a vehicle rear part. The battery device is mounted on the
vehicle rear part and the vehicle rear part is attachable and
detachable to/from a vehicle body frame of the vehicle main body
using a bolt. A main frame overhangs and extends in a longitudinal
direction to reach the underside of the vehicle rear part. The
vehicle rear part also includes a rear frame to be mounted on the
main frame and is fixed with the bolt and a rear cover covering the
rear frame forming a battery compartment, and having a shape
imitating a counter weight.
Inventors: |
Noguchi; Akira; (Koka-shi,
JP) ; Yunoue; Masayuki; (Koka-shi, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Noguchi; Akira
Yunoue; Masayuki |
Koka-shi
Koka-shi |
|
JP
JP |
|
|
Assignee: |
HITACHI CONSTRUCTION MACHINERY CO.,
LTD.
Tokyo
JP
|
Family ID: |
45348092 |
Appl. No.: |
13/702363 |
Filed: |
June 6, 2011 |
PCT Filed: |
June 6, 2011 |
PCT NO: |
PCT/JP2011/062978 |
371 Date: |
December 6, 2012 |
Current U.S.
Class: |
414/719 |
Current CPC
Class: |
B60Y 2200/412 20130101;
B60K 1/04 20130101; B60K 2001/0477 20130101; E02F 9/0858 20130101;
E02F 9/226 20130101; E02F 9/0808 20130101; B60K 2001/0416 20130101;
E02F 9/207 20130101 |
Class at
Publication: |
414/719 |
International
Class: |
E02F 9/08 20060101
E02F009/08 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 15, 2010 |
JP |
2010-136384 |
Claims
1. An electric construction machine having a battery device mounted
on a rear part of a vehicle body thereof, the electric construction
machine performing operations by driving an electric motor with the
battery device, wherein the vehicle body is made up of a vehicle
main body and a vehicle rear part, wherein the vehicle main body
includes a vehicle body frame to whose front a work implement is
attached and a cab seat and a machine room, the cab seat and the
machine room being provided on the vehicle body frame, wherein the
vehicle body frame includes a main frame to whose front the work
implement is attached, wherein the main frame has an overhanging
part overhanging and extending in a longitudinal direction to reach
the underside of the vehicle rear part, wherein the vehicle rear
part includes a rear frame to be mounted on the overhanging part
and a rear cover covering the rear frame, the rear cover forming
therein a battery room in which the battery device is arranged and
having a shape imitating a counter weight, and wherein the rear
frame mounted on the overhanging part is fixed on the overhanging
part using a bolt and is detachable from the overhanging part by
removing the bolt.
2. The electric construction machine according to claim 1, wherein
the overhanging part of the main frame of the vehicle main body
includes two longitudinal ribs overhanging and extending in
parallel in the longitudinal direction to reach the underside of
the rear frame of the vehicle rear part, and the rear frame of the
vehicle rear part includes a base frame which couples with the two
longitudinal ribs of the main frame from above, and the base frame
mounted on the two longitudinal ribs of the main frame is fixed on
the two longitudinal ribs using the bolt.
3. The electric construction machine according to claim 2, wherein
fixing means for fixing the base frame on the two longitudinal ribs
of the main frame includes not only the bolt but also two
positioning pins provided corresponding to the two longitudinal
ribs of the main frame, and the base frame mounted on the two
longitudinal ribs of the main frame is fixed on the two
longitudinal ribs and prevented from coming off using the two
positioning pins and the bolt, the base frame being detachable from
the two longitudinal ribs by removing the positioning pins and the
bolt.
4. The electric construction machine according to claim 2, wherein
the base frame includes two side plates to be arranged inside the
two longitudinal ribs, a base plate connecting lower ends of the
two side plates, and outward horizontal flanges provided at upper
ends of the two side plates, respectively, and the base frame is
mounted on the two longitudinal ribs by making the horizontal
flanges be supported on upper ends of the two longitudinal
ribs.
5. The electric construction machine according to claim 2, wherein
the base frame has a support part to be used for setting the
vehicle rear part on forks of a forklift, the support part being
provided on the lower surface of the base frame and between the two
longitudinal ribs of the main frame, and the vehicle rear part is
movable with respect to the vehicle main body using the
forklift.
6. The electric construction machine according to claim 2, wherein:
the vehicle rear part further includes at least one rear post
erected on a rear part of the base frame and a battery storage
structure for storing the battery device, the battery storage
structure being attached on the base frame with bolts and, the rear
post and the battery storage structure are equipped with wire
attaching parts, and the vehicle rear part is movable with respect
to the vehicle main body by using a crane by attaching wires for
the crane to the wire attaching parts.
7. The electric construction machine according to claim 2, wherein
the base frame has a plurality of mount rubbers attached thereon at
prescribed intervals in the longitudinal direction, and the vehicle
rear part further includes a battery storage structure attached on
the base frame with bolts via the mount rubbers and storing the
battery device.
8. The electric construction machine according to claim 7, wherein
the battery storage structure has a plurality of wire attaching
parts, and the battery storage structure is movable in the vertical
direction with respect to the base frame by using a crane by
attaching wires for the crane to the wire attaching parts.
9. The electric construction machine according to claim 2, wherein
the vehicle rear part further includes a battery storage structure
attached on the base frame and storing the battery device, the
battery storage structure includes a battery table mount mounted on
the base frame and multiple stages of battery tables mounted on the
battery table mount, a battery table as the lowermost one of the
multiple stages of battery tables is fixed on the battery table
mount using bolts, and the multiple stages of battery tables are
supported to be separate from each other in the vertical direction
via posts and are integrated by fixing upper and lower ends of each
of the posts to corresponding battery tables with bolts.
10. The electric construction machine according to claim 1, wherein
the vehicle main body includes the cab seat provided on the vehicle
body frame and a machine room in which a plurality of devices
including the electric motor and an inverter for controlling the
electric motor are arranged, and the rear cover included in the
vehicle rear part and having the shape imitating the counter weight
covers a rear part, a right-hand part, a left-hand part and a top
part of the vehicle rear part, and the machine room is separated
from the other parts of the vehicle main body by a partition plate,
and when the vehicle rear part is connected with the vehicle main
body, the battery room formed by the rear cover secures a space
insulated from heat sources in the machine room by using the
partition plate, the space preventing effects of heat on batteries
of the battery device arranged in the battery room.
Description
TECHNICAL FIELD
[0001] The present invention relates to an electric construction
machine such as hydraulic shovel, wheel loader, etc., which has an
electric motor as a source of power and is operable with a battery
device and a commercial power supply.
BACKGROUND ART
[0002] Construction machines such as hydraulic shovels used for
excavation work and demolition work are generally configured to
supply the hydraulic fluid for the operation (hydraulic operating
fluid) to hydraulic actuators such as a hydraulic motor for the
traveling, a hydraulic motor for swinging, various hydraulic
cylinders constituting a work implement, etc. by driving a
hydraulic pump with a diesel engine.
[0003] Meanwhile, in response to the upsurge of the efforts toward
low-carbon society, there has recently been proposed an electric
hydraulic shovel comprising an electric motor as the source of
power for driving the hydraulic pump in place of the engine and a
battery device for supplying electric power to the electric motor
(Patent Literature 1).
[0004] In the above electric hydraulic shovel according to the
conventional technology, the cab seat is arranged on the left side
of the upper swing structure with respect to the transverse
direction of the upper swing structure. The hydraulic pump, the
electric motor, an oil tank, a heat exchanger (oil cooler), etc.
are arranged on the right side of the cab seat. The battery device
is arranged to the rear of the cab seat. The hydraulic pump, the
electric motor, the oil tank, the heat exchanger, the battery
device, etc. are stored in a single storage space formed by a
cover. The hydraulic pump, the electric motor, the oil tank, the
heat exchanger, etc. are cooled down by a cooling air flow which is
circulated inside the storage space by a cooling fan.
PRIOR ART LITERATURE
Patent Literature
[0005] Patent Literature 1: JP,A 11-140906
SUMMARY OF THE INVENTION
Problem to be Solved by the Invention
[0006] However, there is certain limitation on the amount of
electricity storable in the battery device. With the present
performance of batteries, it is difficult, even for a small-sized
construction machine (e.g., small hydraulic shovel (so-called
mini-shovel)), to continue the operation for an entire day with no
replacement of the battery device, unless the battery device is
used together with the commercial power supply.
[0007] Therefore, when an electric hydraulic shovel is used for
operations for a long time at a place where no commercial power
supply is available, the operator is forced to temporarily stop the
current operation, move the hydraulic shovel to a place where the
commercial power supply is available, and recharge the batteries,
or to call a serviceperson to make him/her remove the exterior
cover of the hydraulic shovel and replace the currently used
battery device with a recharged battery device. The recharging of
the batteries and the replacement of the heavy battery device at
the worksite take a long time, which not only are inconvenient but
also seriously deteriorate the working efficiency of the hydraulic
shovel.
[0008] Further, the battery device needs periodical maintenance by
a serviceperson. Also for the maintenance of the battery device,
the exterior cover of the hydraulic shovel has to be removed or the
battery device has to be detached from the hydraulic shovel for
checking the battery device. In the case of checking the battery
device without detaching it from the construction machine, however,
performing the check properly and efficiently is impossible since
the battery device has been installed in a small space. The
detaching of the battery device at the worksite also takes a
considerably long time similarly to the replacement of the battery
device, which seriously deteriorates the working efficiency.
[0009] Furthermore, the battery technology is progressing
remarkably these days. Especially, the lithium-ion batteries have
high charging capacities and their capacities are expected to
increase more and more in years to come. Therefore, it is desirable
that the electric construction machines be designed to allow for
replacement of the batteries with different types of batteries
according to the progress of the battery technology.
[0010] It is therefore the primary object of the present invention
to provide an electric construction machine that enables quick and
easy replacement of the battery device while allowing for easy
replacement of the battery device with different types of battery
devices according to the progress of the battery technology.
Means for Solving the Problem
[0011] (1) To achieve the above object, the present invention
provides an electric construction machine having a battery device
mounted on a rear part of a vehicle body thereof, the electric
construction machine performing operations by driving an electric
motor with the battery device, wherein the vehicle body is made up
of a vehicle main body and a vehicle rear part, wherein the vehicle
main body includes a vehicle body frame to whose front a work
implement is attached and a cab seat and a machine room, the cab
seat and the machine room being provided on the vehicle body frame,
wherein the vehicle body frame includes a main frame to whose front
the work implement is attached, wherein the main frame has an
overhanging part overhanging and extending in a longitudinal
direction to reach the underside of the vehicle rear part, wherein
the vehicle rear part includes a rear frame to be mounted on the
overhanging part and a rear cover covering the rear frame, the rear
cover forming therein a battery room in which the battery device is
arranged and having a shape imitating a counter weight, and wherein
the rear frame mounted on the overhanging part is fixed on the
overhanging part using a bolt and is detachable from the
overhanging part by removing the bolt.
[0012] As mentioned above, the capacity (storable amount of
electricity) of the battery device is limited and with the present
performance of batteries, it is difficult even for a small-sized
construction machine (e.g., small hydraulic shovel (so-called
mini-shovel)) to continue the operation for an entire day with no
replacement of the battery device unless the battery device is used
together with the commercial power supply.
[0013] In the present invention, the vehicle body is made up of the
vehicle main body and the vehicle rear part. The electric
construction machine is configured so that the vehicle rear part is
detachable from the vehicle main body by removing the bolt.
Therefore, the replacement of the vehicle rear part is facilitated.
Even when the electric construction machine is used for operations
for a long time at a place where no commercial power supply is
available, it is possible to replace the battery device easily and
quickly and to increase the working efficiency by preparing another
vehicle rear part loaded with a recharged battery device, detaching
the already-attached vehicle rear part from the vehicle main body
when the electricity amount of the battery device on the vehicle
rear part has become insufficient, and attaching the prepared
vehicle rear part that is loaded with the recharged battery device,
to the vehicle main body.
[0014] The maintenance of the battery device can also be done with
ease, by replacing the vehicle rear part with another vehicle rear
part loaded with a recharged battery device and moving the detached
vehicle rear part to maintenance facilities.
[0015] Further, when a different type of battery device having an
increased capacity has appeared due to the progress of the battery
technology and the new battery device is desired to be mounted to
the an electric construction machine, it is possible to detach the
vehicle rear part loaded with the currently used battery device
from the vehicle main body and attach another vehicle rear part
loaded with the different type of battery device to the vehicle
main body. Consequently, the battery device can easily be replaced
with different types of battery devices according to the progress
of the battery technology.
[0016] Furthermore, the rear frame of the vehicle rear part can be
formed in various shapes differing in the length in the
longitudinal direction, by which the number of the mounted
batteries can be changed and adjusted to suit the operating time
required of the electric construction machine.
[0017] Moreover, since the battery room is formed inside the rear
cover, the battery device can be protected from shocks from the
outside during the swing of the vehicle body. By forming the
vehicle rear part in a shape imitating the counter weight, an
external appearance having innovativeness can be given to the
electric construction machine.
[0018] (2) Preferably, in the electric construction machine (1),
the overhanging part of the main frame of the vehicle main body
includes two longitudinal ribs overhanging and extending in
parallel in the longitudinal direction to reach the underside of
the rear frame of the vehicle rear part. The rear frame of the
vehicle rear part includes a base frame which couples with the two
longitudinal ribs of the main frame from above. The base frame
mounted on the two longitudinal ribs of the main frame is fixed on
the two longitudinal ribs using the bolt.
[0019] With this configuration, the movement of the rear frame in
the transverse direction is restricted by the base frame and the
two longitudinal ribs of the main frame. Consequently, the vehicle
rear part can be held and fixed stably with respect to the vehicle
main body.
[0020] (3) Preferably, in the electric construction machine (2),
fixing means for fixing the base frame on the two longitudinal ribs
of the main frame includes not only the bolt but also two
positioning pins provided corresponding to the two longitudinal
ribs of the main frame. The base frame mounted on the two
longitudinal ribs of the main frame is fixed on the two
longitudinal ribs and prevented from coming off using the two
positioning pins and the bolt, the base frame being detachable from
the two longitudinal ribs by removing the positioning pins and the
bolt.
[0021] With this configuration, the whole of the vehicle rear part
can be attached to and detached from the vehicle main body with
ease while leaving the battery device mounted on the vehicle rear
part.
[0022] (4) Preferably, in the electric construction machine (2),
the base frame includes two side plates to be arranged inside the
two longitudinal ribs, a base plate connecting lower ends of the
two side plates, and outward horizontal flanges provided at upper
ends of the two side plates, respectively. The base frame is
mounted on the two longitudinal ribs by making the horizontal
flanges be supported on upper ends of the two longitudinal
ribs.
[0023] With this configuration, the movement of the rear frame in
the transverse direction is restricted by the two side plates of
the base frame and the two longitudinal ribs of the main frame, and
the movement of the rear frame in the vertical direction is
restricted by the horizontal flanges of the base frame and the two
longitudinal ribs of the main frame. Consequently, the vehicle rear
part can be fixed to the vehicle main body more stably.
[0024] (5) Preferably, in the electric construction machine (2),
the base frame has a support part to be used for setting the
vehicle rear part on forks of a forklift. The support part is
provided on the lower surface of the base frame and between the two
longitudinal ribs of the main frame. The vehicle rear part is
movable with respect to the vehicle main body using the
forklift.
[0025] With this configuration, the vehicle rear part can be
replaced safely by use of a forklift even when the vehicle rear
part loaded with the battery device is heavy.
[0026] (6) Preferably, in the electric construction machine (2),
the vehicle rear part further includes at least one rear post
erected on a rear part of the base frame and a battery storage
structure attached on the base frame with bolts and storing the
battery device. The rear post and the battery storage structure are
equipped with wire attaching parts. The vehicle rear part is
movable with respect to the vehicle main body by using a crane by
attaching wires for the crane to the wire attaching parts.
[0027] With this configuration, the vehicle rear part can be
replaced safely by use of a crane even when the vehicle rear part
loaded with the battery storage structure is heavy.
[0028] (7) Preferably, in the electric construction machine (2),
the base frame has a plurality of mount rubbers attached thereon at
prescribed intervals in the longitudinal direction. The vehicle
rear part further includes a battery storage structure attached on
the base frame with bolts via the mount rubbers and storing the
battery device.
[0029] With this configuration, vertical vibrations of the battery
storage structure and the battery device during the operation of
the construction machine are absorbed, by which the battery device
and the battery storage structure can be protected from vertical
operating vibrations of the construction machine.
[0030] Further, by standardizing the lowermost attaching part of
the battery storage structure (i.e., battery table mount), it
becomes possible to mount various types of battery storage
structures differing in the configuration. Consequently, various
types of batteries can easily be mounted according to the progress
of the battery technology.
[0031] (8) Preferably, in the electric construction machine (7),
the battery storage structure has a plurality of wire attaching
parts. The battery storage structure is movable in the vertical
direction with respect to the base frame by using a crane by
attaching wires for the crane to the wire attaching parts.
[0032] With this configuration, the battery storage structure can
be replaced safely by use of a crane even when the battery storage
structure loaded with the battery device is heavy.
[0033] (9) Preferably, in the electric construction machine (2),
the vehicle rear part further includes a battery storage structure
attached on the base frame and storing the battery device. The
battery storage structure includes a battery table mount mounted on
the base frame and multiple stages of battery tables mounted on the
battery table mount. A battery table as the lowermost one of the
multiple stages of battery tables is fixed on the battery table
mount using bolts. The multiple stages of battery tables are
supported to be separated from each other in the vertical direction
via posts and are integrated by fixing upper and lower ends of each
of the posts to corresponding battery tables with bolts.
[0034] With this configuration, a lot of battery modules can be
mounted and the attaching/detaching of the battery modules can be
conducted safely and easily.
[0035] (10) Preferably, in the electric construction machine (1),
the vehicle main body includes the cab seat provided on the vehicle
body frame and a machine room in which a plurality of devices
including the electric motor and an inverter for controlling the
electric motor are arranged. The rear cover included in the vehicle
rear part and having the shape imitating the counter weight covers
a rear part, a right-hand part, a left-hand part and a top part of
the vehicle rear part. The machine room is separated from the other
parts of the vehicle main body by a partition plate. When the
vehicle rear part is connected with the vehicle main body, the
battery room formed by the rear cover secures a space insulated
from heat sources in the machine room by the partition plate. The
space prevents effects of heat on batteries of the battery device
arranged in the battery room.
[0036] With this configuration, the temperature rise as a cause of
deterioration of the battery modules can be prevented.
Effect of the Invention
[0037] According to the present invention, the replacement of the
battery device can be conducted easily and quickly and the working
efficiency can be increased.
[0038] Since the battery device can be replaced easily and quickly,
the maintenance of the battery device can be done with ease.
[0039] Further, since the battery device can be replaced by
detaching the whole of the vehicle rear part from the vehicle main
body, the battery device can easily be replaced with different
types of battery devices according to the progress of the battery
technology.
[0040] Furthermore, the rear frame of the vehicle rear part can be
formed in various shapes differing in the length in the
longitudinal direction, by which the number of the mounted
batteries can be changed and adjusted to suit the operating time
required of the electric construction machine.
[0041] Moreover, since the battery room is formed inside the rear
cover, the battery device can be protected from shocks from the
outside during the swing of the vehicle body. By forming the
vehicle rear part in a shape imitating the counter weight, an
external appearance having innovativeness can be given to the
electric construction machine.
BRIEF DESCRIPTION OF THE DRAWINGS
[0042] FIG. 1 is a perspective view showing the external appearance
of an electric hydraulic shovel in accordance with an embodiment of
the present invention.
[0043] FIG. 2 is a schematic diagram showing a state in which an
upper swing structure of the hydraulic shovel has been separated
into a vehicle main body and a vehicle rear part, wherein the
separated upper swing structure is viewed from its left side.
[0044] FIG. 3 is a schematic diagram showing the state in which the
upper swing structure of the hydraulic shovel has been separated
into the vehicle main body and the vehicle rear part, wherein the
separated upper swing structure is viewed from its right side.
[0045] FIG. 4 is a perspective view magnifying a swing frame of the
vehicle main body.
[0046] FIG. 5 is a perspective view magnifying a rear frame of the
vehicle rear part.
[0047] FIG. 6 is a perspective view of a battery storage structure
on which a battery device has been mounted.
[0048] FIG. 7 is an exploded perspective view of the battery
storage structure.
[0049] FIG. 8 is a perspective view of the battery storage
structure.
[0050] FIG. 9 is a schematic diagram showing the details of the
positional relationship between a battery table mount and a base
frame of the rear frame and the details of base structure of the
two parts when the battery table mount has been installed in the
box-shaped base frame, wherein the left-hand side is a cutaway view
in which front parts of the base frame and the battery table mount
have been cut away at a plane extending in the transverse direction
and the right-hand side is a cutaway view in which right-hand parts
of the base frame and the battery table mount have been cut away at
a plane extending in the longitudinal direction.
[0051] FIG. 10 is a schematic diagram showing a state in which
battery modules have been stored in the battery table mount.
[0052] FIG. 11 is a schematic diagram showing a state in which
battery modules have been mounted on a lowermost battery table and
the loaded battery table has been attached on the battery table
mount shown in FIG. 10.
[0053] FIG. 12 is a schematic diagram showing a state in which
battery modules have been mounted on a second battery table and the
loaded battery table has been attached on the lowermost battery
table shown in FIG. 11.
[0054] FIG. 13 is a schematic diagram showing the details of a
method for attaching a battery module to a third battery table and
showing a state in which a battery module has been detached from a
right side plate of the third battery table.
[0055] FIG. 14 is a schematic diagram showing the details of the
method for attaching a battery module to the third battery table
and showing a state in which the battery module has been attached
to the right side plate of the third battery table.
[0056] FIG. 15 is a schematic diagram showing the details of the
method for attaching a battery table to the third battery table and
showing a coupling relationship among a clamp bar, a battery
support bolt and the battery module, wherein the left-hand side
shows a state in which the battery module has been cramped, and the
right-hand side shows an end of the clamp bar and a connecting part
of the battery support bolt in a disassembled state.
[0057] FIG. 16 is a schematic diagram showing the details of the
method for attaching a battery table to the third battery table and
showing a state in which the battery module has been positioned and
held by ribs provided on the bottom of a central plate of the third
battery table.
[0058] FIG. 17 is a schematic diagram showing the mounting of the
completed battery storage structure on the rear frame of the
vehicle rear part, which is a state just before the battery storage
structure is mounted on the base frame of the rear frame.
[0059] FIG. 18 is a schematic diagram showing the mounting of the
completed battery storage structure on the rear frame of the
vehicle rear part, which is a state in which the battery storage
structure has been mounted on the base frame.
[0060] FIG. 19 is a schematic diagram showing a state just before
the rear frame loaded with the battery storage structure is mounted
on the swing frame (main frame) of the vehicle main body.
[0061] FIG. 20 is a schematic diagram showing a state in which the
rear frame has been mounted on the swing frame (main frame) of the
vehicle main body.
[0062] FIG. 21 is a schematic diagram magnifying a connecting part
between the rear frame and the swing frame (main frame) using
positioning pins and a bolt.
[0063] FIG. 22 is a schematic diagram showing the mounting of the
rear frame that is loaded with the battery storage structure, on
the swing frame using a crane.
[0064] FIG. 23 is a schematic diagram showing the mounting of the
rear frame that is loaded with the battery storage structure, on
the swing frame using a forklift.
[0065] FIG. 24 is a schematic diagram showing a driving/cooling
system of the hydraulic shovel.
MODE FOR CARRYING OUT THE INVENTION
[0066] In the following, an embodiment of an electric construction
machine in accordance with the present invention will be described
in detail with reference to the accompanying drawings, by
illustrating a case where the present invention is applied to a
hydraulic shovel.
[0067] FIG. 1 is a perspective view showing the external appearance
of an electric hydraulic shovel in accordance with this
embodiment.
[0068] The reference character 1 in FIG. 1 represents the electric
hydraulic shovel. The hydraulic shovel 1 comprises a lower travel
structure 2 of the crawler type capable of traveling by itself, an
upper swing structure 3 mounted on the lower travel structure 2 to
be capable of swinging, and a work implement 4 of the swinging type
attached to the front part of the upper swing structure 3 for
performing earth/sand excavation, etc. The vehicle body of the
hydraulic shovel 1 is formed by the upper swing structure 3 and the
lower travel structure 2. The work implement 4 is made up of a boom
4A, an arm 4B, a bucket 4C, a boom cylinder 4D, an arm cylinder 4E,
a bucket cylinder 4F, etc.
[0069] FIG. 24 is a schematic diagram showing a driving/cooling
system of the hydraulic shovel 1.
[0070] The hydraulic shovel 1 comprises a hydraulic pump 17, an
electric motor 18 as a source of power, an inverter 19, an oil tank
20, a heat exchanger 21 including an oil cooler 22 and a radiator
23, a control valve 24, a hydraulic fluid supply line 25, a
hydraulic fluid discharge line 26, a coolant line 27 (27A, 27B,
27C), a coolant pump 28, a cooling fan 30, a battery device 31,
etc.
[0071] The electric motor 18 is powered by the battery device 31 as
a power source and controlled by the inverter 19. The inverter 19
is controlled via unshown operating means and controller. The
electric motor 18 is connected to the hydraulic pump 17. Being
driven by the electric motor 18, the hydraulic pump 17 pumps up the
hydraulic fluid from the oil tank 20 via the hydraulic fluid supply
line 25 and drives hydraulic actuators such as the boom cylinder
4D, the arm cylinder 4E, the bucket cylinder 4F, a travel hydraulic
motor (unshown) and a swing hydraulic motor (unshown) by supplying
the hydraulic fluid to the actuators via the control valve 24. The
hydraulic fluid returning from each actuator flows back to the oil
tank 20 via the control valve 24 and the hydraulic fluid discharge
line 26. The hydraulic fluid discharge line 26 is equipped with the
oil cooler 22. The oil cooler 22 cools down the hydraulic fluid
heated by the hydraulic devices by use of cooling air from the
cooling fan 30.
[0072] The electric motor 18 and the inverter 19 have cooling
jackets 18A and 19A, respectively. A circulatory path for
circulating the coolant through the radiator 23, the coolant line
27 (27A, 27B, 27C), the coolant pump 28 and the cooling jackets 18A
and 19A is formed. The radiator 23 cools down the coolant heated by
the electric motor 18 and the inverter 19 by use of cooling air
from the cooling fan 30.
[0073] FIGS. 2 and 3 are schematic diagrams showing a state in
which the upper swing structure 3 of the hydraulic shovel 1 has
been separated into a vehicle main body and a vehicle rear part.
The upper swing structure 3 in the separated state is viewed from
its left side in FIG. 2 and from its right side in FIG. 3. In this
description, terms indicating directions (right, left, front, rear,
etc.) mean directions from the viewpoint of the operator seated on
the cab seat.
[0074] Referring to FIGS. 1 to 3, the upper swing structure
(vehicle body) 3 is made up of a vehicle main body 100 and a
vehicle rear part 200.
[0075] The vehicle main body 100 includes a swing frame (vehicle
frame) 101 to whose front the work implement 4 is attached, and a
cab seat 102 (generic name for equipment on which the operator is
seated to operate the construction machine) and a machine room 103
which are mounted on the swing frame 101. The cab seat 102 is
arranged in a left-hand part of the vehicle main body 100. The
machine room 103 is arranged in a right-hand part of the vehicle
main body 100 and on the right side of the cab seat 102.
[0076] The cab seat 102 is of the canopy type, which is equipped
with a canopy 104. The cab seat 102 has a floor panel 102a (see
FIG. 1), on which devices/equipment necessary for letting the
operator operate the hydraulic shovel 1 are mounted. The
devices/equipment include a seat 105 on which the operator is
seated, control levers 106a, 106b and 107, etc. The cab seat 102
may also be of the cabin type surrounded with panels and window
panes.
[0077] The machine room 103 stores the hydraulic pump 17, the
electric motor 18, the inverter 19, the oil tank 20, the heat
exchanger 21 (the oil cooler 22 and the radiator 23), the cooling
fan 30, etc.
[0078] Most of the vehicle main body 100 exclusive of the cab seat
102 is covered with an exterior cover 110. The exterior cover 110
is made up of a left cover 110a covering a left rear part of the
cab seat 102, a rear cover 110b covering a rear part of the cab
seat 102, a floor cover 110c covering a lower front part and a side
part of the floor panel 102a of the cab seat 102, and an upper
right cover 110d and a right side cover 110e which are arranged on
the right side of the cab seat 102 and covering the machine room
103.
[0079] The vehicle rear part 200 includes a rear frame 201, a
battery storage structure 203 and a rear cover 205. The rear frame
201 is connected to the swing frame 101 of the vehicle main body
100. The battery storage structure 203 storing the battery device
31 is mounted on the rear frame 201. The rear cover 205 covers the
rear frame 201 and the battery storage structure 203 and forms a
battery room 204 thereinside together with the left cover 110a and
the rear cover 110b of the vehicle main body 100, etc. The rear
cover 205 has a shape imitating the counter weight of the
conventional engine-driven hydraulic shovels. The vehicle rear part
200 serves also as the counter weight that is generally employed
for hydraulic shovels, by use of the weight of the battery storage
structure 203, the rear frame 201 and the rear cover 205. The
battery device 31 stored in the battery storage structure 203 is
formed by electrically connecting a lot of battery modules 202 (see
FIG. 6). As shown in FIG. 24, the battery device 31 is electrically
connected to the electric motor 18 installed in the machine room
103 and functions as a power supply for driving the electric motor
18. The electric motor 18 can also be driven by the commercial
power supply.
[0080] FIG. 4 is a perspective view magnifying the swing frame 101
of the vehicle main body 100.
[0081] The swing frame 101 of the vehicle main body 100 is provided
as a vehicle body frame to serve as the base of the upper swing
structure 3. As shown in FIG. 4, the swing frame 101 includes a
main frame 120, a left side frame 130 and a right side frame
140.
[0082] The main frame 120 includes a support bracket 121,
longitudinal ribs 122a, 122b, 123a and 123b, a base plate 124, and
a transverse plate 125. The work implement 4 is attached to the
support bracket 121 provided at the front of the main frame 120.
The left and right longitudinal ribs 122a and 122b are provided in
a rear part of the main frame 120 to overhang and extend in
parallel in the longitudinal direction to reach the underside of
the vehicle rear part 200. The longitudinal ribs 123a and 123b are
arranged in a front part of the main frame 120 to link the support
bracket 121 with the longitudinal ribs 122a and 122b. The base
plate 124 is a flat plate-like member attached to the lower ends of
the longitudinal ribs 122a, 122b, 123a and 123b. The transverse
plate 125 is erected on the base plate 124 to be sandwiched between
the front longitudinal ribs (123a, 123b) and the rear longitudinal
ribs (122a, 122b) and to extend across the longitudinal ribs. The
two longitudinal ribs 122a and 122b form an overhanging part 122. A
left part 125a of the transverse plate 125 protrudes and extends to
the left side frame 130.
[0083] The left side frame 130 includes a left overhang beam 131
overhanging leftward from the front end of the left front
longitudinal rib 123a, a left overhang beam 132 overhanging
leftward from a central part of the left rear longitudinal rib
122a, and a left frame member 133 connected to the left ends of the
left overhang beams 131 and 132 and the left part 125a of the
transverse plate 125.
[0084] The right side frame 140 includes a right overhang beam 141,
in a central part thereof, overhanging rightward from between the
right front longitudinal rib 123b and the right rear longitudinal
rib 122b, a right overhang beam 142, in a rear part thereof,
overhanging rightward from a central part of the right rear
longitudinal rib 122b, a right frame member 143 connected to the
right ends of the right overhang beam 141 in the central part and
the right overhang beam 142 in the rear part, a connection plate
member 144 connecting the right front longitudinal rib 123b to the
front end of the right frame member 143, and a heat exchanger
support table 145 fixed to cross-link the connection plate member
144 with the right overhang beam 141 in the central part.
[0085] The floor panel 102a (see FIG. 1) of the cab seat 102 is
attached on the front longitudinal ribs 123a and 123b, the
transverse plate 125 and the left front overhang beam 131 of the
main frame 120. The cab seat 102 is mounted on the floor panel
102a.
[0086] Partition plates 151 and 152 joined with each other in an
L-shape (see FIGS. 2 and 3) are attached to upper ends of the front
and rear right longitudinal ribs 123b and 122b and the right rear
overhang beam 142 of the main frame 120. The machine room 103 is
separated from the cab including the cab seat 102 and from the
vehicle rear part 200 (especially, the battery room 204) by the
partition plates 151 and 152. Multiple stages of support tables
(not shown) are provided on the right overhang beams 141 and 142 in
the central and rear parts. The electric motor 18, the inverter 19,
the hydraulic pump 17, etc. shown in FIG. 24 are set on the support
tables. The oil tank 20 is set on the connection plate member 144.
The heat exchanger 21 and the cooling fan 30 are set on the heat
exchanger support table 145.
[0087] The aforementioned left cover 110a and floor cover 110c are
attached to the left frame member 133, the front face of the left
overhang beam 131 of the left side frame 130, the left end of the
left part 125a of the transverse plate 125 and the left end of the
left overhang beam 132. The aforementioned right side cover 110e
covering the machine room 103 is attached to the right frame member
143 and the right ends of the right overhang beams 141 and 142 of
the right side frame 140.
[0088] Pin holes 155a and 155b, as through holes for positioning
pins 301a and 301b (see FIG. 5, etc.), are formed through lateral
surfaces of rear end parts of the rear longitudinal ribs 122a and
122b of the main frame 120. A hole 156, into which a bolt 302 (see
FIG. 5, etc.) is inserted, is formed through the lateral surface of
the rear end part of the right rear longitudinal rib 122b to adjoin
the pin hole 155b. Reinforcing plates 157a and 157b (see FIG. 19,
etc.) are attached by welding, etc. to parts of lateral surfaces of
the longitudinal ribs 122a and 122b where the pin holes 155a and
155b are formed.
[0089] Support plates 158a and 158b (see FIG. 19, etc.) are
attached by welding, etc. to front parts of medial surfaces of the
longitudinal ribs 122a and 122b to be situated at a prescribed
height. The lower surface of the tip (rear end part) of each
support plate 158a, 158b is shaped to form a slanted guiding
part.
[0090] FIG. 5 is a perspective view magnifying the rear frame 201
of the vehicle rear part 200.
[0091] The rear frame 201 of the vehicle rear part 200 includes a
base frame 216 which couples with the two longitudinal ribs 122a
and 122b in the rear part of the vehicle main body 100 from above.
The rear frame 201 is configured so that the base frame 216 can be
set on the two longitudinal ribs 122a and 122b. The base frame 216
which has been set on the two longitudinal ribs 122a and 122b is
fixed to the longitudinal ribs 122a and 122b by using the
positioning pins 301a and 301b and the bolt 302. The vehicle rear
part 200 can be detached from the vehicle main body 100 by removing
the positioning pins 301a and 301b and the bolt 302.
[0092] Specifically, the rear frame 201 includes the aforementioned
base frame 216, a left outer frame 217a in a curved shape, and a
right outer frame 217b in a curved shape.
[0093] The base frame 216 is a box-like frame including two side
plates 211a and 211b (left side plate 211a, right side plate 211b),
a front plate 212a, a rear plate 212b and a base plate 213. The two
side plates 211a and 211b, extending in the longitudinal direction
of the vehicle rear part 200, are formed so that the base frame 216
can be inserted into the gap between the two longitudinal ribs 122a
and 122b in the rear part of the vehicle main body 100. The front
plate 212a connects the front ends of the two side plates 211a and
211b. The rear plate 212b connects the rear ends of the two side
plates 211a and 211b. The base plate 213 connects the lower ends of
the front plate 212a, the rear plate 212b and the side plates 211a
and 211b. Horizontal flanges 214a and 214b protruding outward are
provided at the upper ends of the side plates 211a and 211b,
respectively. The outer frames 217a and 217b are integrally fixed
to rear ends of side faces of the base frame 216 (rear ends of
lateral surfaces of the side plates 211a and 211b) by welding.
[0094] The rear frame 201 further includes two rear posts 218a and
218b and guard pipes 219a and 219b. The rear posts 218a and 218b
are integrally fixed to left and right rear ends of the top of the
base frame 216 (rear ends of the tops of the horizontal flanges
214a and 214b) by welding. Each guard pipe (219a, 219b) is
integrally fixed between the outer frame (217a, 217b) and the rear
post (218a, 218b) by welding so as to protect the battery storage
structure 203 and the battery device 31 from external shocks. The
aforementioned rear cover 205 is attached and fixed to the curved
outer frames 217a and 217b and the rear posts 218a and 218b with
bolts. Upper ends of the two rear posts 218a and 218b are equipped
with wire attaching parts 220a and 220b, to which wires 311 (see
FIG. 22) used for pulling up the rear frame 201 with a crane are
attached.
[0095] Insertion support plates 221a and 221b (see FIG. 23, etc.)
are fixed by welding to the lateral surfaces of the side plates
211a and 211b of the base frame 216, respectively. Pin holes 222a
and 222b, as through holes for the positioning pins 301a and 301b,
are formed through the lateral surfaces of the rear parts of the
insertion support plates 221a and 221b and the side plates 211a and
211b. A tapped bolt hole 223, into which the bolt 302 is inserted,
is formed through the lateral surface of the rear part of the right
side plate 211b to adjoin the pin hole 222b.
[0096] The rear frame 201 is put on the longitudinal ribs 122a and
122b of the main frame 120 of the vehicle main body 100 by making
the horizontal flanges 214a and 214b of the base frame 216 be
supported on the upper ends of the longitudinal ribs 122a and 122b
of the main frame 120. Subsequently, the side plates 211a and 211b
of the rear frame 201 are gradually inserted into the main frame
120, by which the insertion support plates 221a and 221b that are
attached to the lateral surfaces of the side plates 211a and 211b,
slide along and under the support plates 158a and 158b that are
attached to the medial surfaces of the longitudinal ribs 122a and
122b, with upper surfaces of the tips of the insertion support
plates 221a and 221b sliding along the slanted guiding parts of the
support plates 158a and 158b. After the side plates 211a and 211b
of the rear frame 201 have been inserted in the main frame 120, the
movement of the rear frame 201 in the vertical direction is
restricted.
[0097] The side plates 211a and 211b of the rear frame 201 are
connected and integrated with the swing frame 101 of the vehicle
main body 100 by inserting the positioning pins 301a and 301b into
the pin holes 155a and 155b of the longitudinal ribs 122a and 122b
and the pin holes 222a and 222b of the side plates 211a and 211b,
inserting the bolt 302 into the hole 156 of the longitudinal rib
122b and the bolt hole 223 of the side plate 211b, and tightening
up the bolt 302. In this state, the movement of the rear frame 201
in the vertical and longitudinal directions is restricted by the
positioning pins 301a and 301b and the movement of the rear frame
201 in the transverse direction is restricted by the bolt 302.
[0098] As shown in FIG. 21, a reinforcing plate 341 is attached to
a part of the longitudinal rib 122b of the main frame 120 where the
pin hole 155b for the positioning pin 301b is formed. The
positioning pin 301b is inserted into the longitudinal rib 122b via
the reinforcing plate 341. The positioning pin 301b has a lock
plate 342 at its top. By fixing the lock plate 342 to the
reinforcing plate 341 with a bolt 343, the positioning pin 301b is
firmly fixed to the longitudinal rib 122b of the main frame 120 and
securely prevented from coming off. The same goes for the
positioning pin 301a on the left side unshown in FIG. 21.
[0099] The rear frame 201 has a plurality of mount rubbers 231
(four mount rubbers 231 for each side plate 211a, 211b in the
illustrated example), a plurality of guide plates 232 (three guide
plates 232 for each side plate 211a, 211b in the illustrated
example), and a plurality of guide plates 233 (two guide plates 233
for each of the front and rear plates 212a and 212b in the
illustrated example). The mount rubbers 231 are attached to the
horizontal flange 214a, 214b of each side plate 211a, 211b of the
base frame 216 via a reinforcing plate 230a, 230b at prescribed
intervals in the longitudinal direction. The guide plates 232 are
attached to the medial surface of each of the side plates 211a and
211b at prescribed intervals in the longitudinal direction. The
guide plates 233 are attached to the medial surface of each of the
front and rear plates 212a and 212b of the base frame 216 at
prescribed intervals in the transverse direction.
[0100] Each mount rubber 231 is a rubber member in a cylindrical
shape. A mount bolt 234 that is attached to the horizontal flange
214a, 214b and the reinforcing plate 230a, 230b, penetrates and
protrudes from the center of the mount rubber 231. The battery
storage structure 203 is mounted on the base frame 216 via the
reinforcing plates 230a and 230b and the mount rubbers 231 and
fixed to the base frame 216 by attaching nuts to the mount bolts
234. In the state in which the battery storage structure 203 has
been attached on the base frame 216, the mount rubbers 231 serve as
antivibration rubbers for preventing vibrations of the battery
storage structure 203 and the battery device 31 in the vertical
direction.
[0101] In the state in which the battery storage structure 203 has
been mounted on the base frame 216, part of the battery storage
structure 203 is accommodated in the space inside the base frame
216 (explained later). When the mount rubbers 231 prevent the
vibrations of the battery storage structure 203 and the battery
device 31 in the vertical direction in the state in which part of
the battery storage structure 203 has been accommodated in the
space inside the base frame 216, the guide plates 232 which are
attached to the medial surfaces of the two side plates 211a and
211b at prescribed intervals and the guide plates 233 which are
attached to the medial surfaces of the front and rear plates 212a
and 212b at prescribed intervals, serve to stabilize the
antivibration function of the mount rubbers 231, by fixing the
positions of the battery storage structure 203 and the battery
device 31 in the longitudinal and transverse directions while
allowing the vibration of the battery storage structure 203 and the
battery device 31 in the vertical direction. The guide plates 232
and 233 are formed of, for example, self-lubricating plastic
material or rubber material that has undergone surface processing
for surface lubrication.
[0102] FIG. 6 is a perspective view of the battery storage
structure 203 on which the battery device 31 has been mounted. FIG.
7 is an exploded perspective view of the battery storage structure
203. FIG. 8 is a perspective view of the battery storage structure
203.
[0103] The battery storage structure 203 includes a battery table
mount 251 mounted on the base frame 216 and multiple stages (three
stages in the illustrated example) of battery tables 252, 253 and
254 mounted on the battery table mount 251. A plurality of battery
modules 202 are set in the battery table mount 251 and on the
battery tables 252, 253 and 254. The battery table 252, as the
lowermost one of the multiple stages of battery tables 252, 253 and
254, is fixed on the battery table mount 251 with bolts. The
multiple stages of battery tables 252, 253 and 254 are supported to
be separate from each other in the vertical direction via posts
276a, 286a, 287a and 287b (explained later). The upper and lower
ends of each post 276a, 286a, 287a, 287b are fixed to corresponding
battery tables with bolts.
[0104] Specifically, the battery table mount 251, having a box-like
shape similar to the base frame 216, includes a left side plate
261a, a right side plate 261b, a front plate 262a, a rear plate
262b and a base plate 263. The left and right side plates 261a and
261b are provided with horizontal flanges 264a and 264b protruding
outward. However, the size of the box-shaped battery table mount
251 is set one step smaller than that of the box-shaped base frame
216 so that the side plates 261a and 261b and the front and rear
plates 262a and 262b of the battery table mount 251 can be inserted
into the space inside the side plates 211a and 211b and the front
and rear plates 212a and 212b of the base frame 216 while being
pressed and guided by the guide plates 232 and 233. The base plate
263 has a plurality of vent holes 265 for forming an upward air
flow for cooling the battery modules 202.
[0105] Each horizontal flange 264a, 264b of the battery table mount
251 has a plurality of (four in the illustrated example) bolt holes
266, into which the mount bolts 234 penetrating the mount rubbers
231 of the horizontal flange 214a, 214b of the base frame 216 are
inserted. Each horizontal flange 264a, 264b further has a plurality
of (three in the illustrated example) tapped bolt holes 267.
[0106] The battery table 252 as the lowermost stage (first stage)
includes a central plate 271a extending in the longitudinal
direction, a left side plate 271b situated to the left of the
central plate 271a and having substantially the same length as the
central plate 271a, a right side plate 271c situated to the right
rear of the central plate 271a and being shorter than the central
plate 271a, and a framing member 272 supporting these plates and
forming the exterior frame of the battery table 252. Each plate has
a plurality of vent holes 273 for forming an upward air flow for
cooling the battery modules 202. The central plate 271a is
separated from the left and right side plates 271b and 271c by left
partition plate 274a and right partition plate 274b which are
erected on each sides of the central plate 271a. Lateral parts of
the left and right side plates 271b and 271c are also provided with
vertical partition plates 274c and 274d (see FIG. 6, FIG. 8, etc.)
for positioning the battery modules 202.
[0107] A plurality of mount plates 275, each having a tapped bolt
hole, are provided at appropriate positions on the framing member
272.
[0108] Further, a post structure 276 having four posts 276a is
attached to the rear part of the battery table 252 where the right
side plate 271c is situated. The lower ends of the four posts 276a
are supported on the top surface of the framing member 272. The
lower ends of the posts 276a on the right-hand side are fixed to
the right partition plate 274b with bolts, while the lower ends of
the posts 276a on the left-hand side are fixed to the left
partition plate 274a with bolts. The upper ends of the four posts
276a are connected by a top plate 276b having a plurality of tapped
bolt holes.
[0109] The lowermost battery table 252 is fixed on the battery
table mount 251 by positioning the lowermost battery table 252 on
the battery table mount 251 such that after the bolt holes of the
mount plates 275 are aligned with the bolt holes 267 of the
horizontal flanges 264a and 264b of the battery table mount 251,
bolts 255 are inserted into the bolt holes, and the bolts 255 are
tightened up.
[0110] Similarly to the lowermost (first) battery table 252, the
second battery table 253 also includes a central plate 281a, a left
side plate 281b, a right side plate 281c, a framing member 282,
vent holes 283, partition plates 284a, 284b, 284c and 284d, and a
post structure 286 including four posts 286a and a top plate 286b
having tapped bolt holes. However, no mount plate is provided on
the framing member 282. Instead, the second battery table 253
further includes two additional upper posts 287a erected on the top
surface of the framing member 282 and five additional lower posts
287b extending downward from the under surface of the framing
member 282. The lower ends of the upper posts 287a are fixed to the
top surface of the framing member 282 with bolts, while the upper
ends of the lower posts 287b are fixed to the under surface of the
framing member 282 with bolts. A mount plate 288a having tapped
bolt holes is attached to the upper end of each upper post 287a,
while a mount plate 288b having tapped bolt holes is attached to
the lower end of each lower post 287b.
[0111] The second battery table 253 is fixed on the lowermost
battery table 252 by positioning the second battery table 253 on
the lowermost battery table 252 such that after the bolt holes of
the mount plates 288b of the lower posts 287b are aligned with the
bolt holes of the framing member 272 of the lowermost battery table
252 and unshown bolt holes of the left and right side plates 281b
and 281c are aligned with the bolt holes of the top plate 276b of
the post structure 276 of the lowermost battery table 252, bolts
are inserted into the bolt holes, and the bolts are tightened
up.
[0112] The third battery table 254 has a size and a shape
corresponding to the rear part of the lowermost battery table 252
where the right side plate 271c is situated and corresponding to
the rear part of the second battery table 253 where the right side
plate 281c is situated. The third battery table 254 includes a
central plate 291a, a left side plate 291b, a right side plate
291c, a framing member 292, vent holes 293, and partition plates
294a, 294b and 294c. A plurality of mount plates 295, each having a
tapped bolt hole, are attached to appropriate parts of the under
surface of the framing member 292.
[0113] The third battery table 254 is fixed on the second battery
table 253 by positioning the third battery table 254 on the second
battery table 253 such that after the bolt holes of the mount
plates 295 on the under surface of the framing member 292 are
aligned with the bolt holes of the mount plates 288a of the upper
posts 287a of the second battery table 253 and unshown bolt holes
of the left and right side plates 291b and 291c are aligned with
the bolt holes of the top plate 286b of the post structure 286 of
the second battery table 253, bolts are inserted into the bolt
holes, and the bolts are tightened up.
[0114] Right and left lateral parts of the framing members 272, 282
and 292 of the first through third battery tables 252, 253 and 254
are equipped with wire attaching parts 312, to which wires 311 (see
FIG. 22) for pulling up each battery table with a crane can be
attached. Further, a plurality of battery support bolts 314 for
fixing the battery modules 202 are erected on appropriate parts of
the first through third battery tables 252, 253 and 254.
[0115] As shown in FIG. 6, a duct support plate 316 having a duct
hole 316a is attached to a front part of the framing member 292 of
the third battery table 254 where the right side plate 291c is
situated. A duct 317 is connected to the duct hole 316a of the duct
support plate 316. The other end of the duct 317 is connected to a
duct hole 318 (see FIG. 2) formed through the partition plate 151
of the machine room 103. The duct 317 has a cooling fan (unshown)
installed therein. The whole of the battery storage structure 203
storing the battery modules 202 is covered with a flexible sheet
(unshown) having a hole formed at a position corresponding to the
duct 317. The duct is inserted into the hole of the sheet and the
part is sealed up by winding a string thereon. With this
configuration, the cooling of the battery modules 202 can be
performed efficiently during the operation of the hydraulic shovel
1 by discharging the air which flows upward through the vent holes
265, 273, 283 and 293 of the battery table mount 251 and the first
through third battery tables 252, 253 and 254, into the machine
room 103 with the cooling fan inside the duct 317 and then out of
the machine room 103 to the outside with the cooling fan 30 of the
machine room 103.
[0116] FIG. 9 is a schematic diagram showing the details of the
positional relationship between the battery table mount 251 and the
base frame 216 of the rear frame 201 and the details of base
structure of the two parts when the battery table mount 251 has
been installed in the box-shaped base frame 216. The left-hand side
of FIG. 9 is a cutaway view in which front parts of the base frame
216 and the battery table mount 251 have been cut away at a plane
extending in the transverse direction. The right-hand side of FIG.
9 is a cutaway view in which right-hand parts of the base frame 216
and the battery table mount 251 have been cut away at a plane
extending in the longitudinal direction.
[0117] The base plate 263 of the battery table mount 251 has vent
holes 265 as mentioned above. The interior surface (upper surface)
of the base plate 263 is provided with two ribs 321 for positioning
and holding the battery modules 202. The medial surfaces of the
side plates 261a and 261b are equipped with battery support bolts
322 for fixing the battery modules 202.
[0118] The battery table mount 251 has been attached on the base
frame 216 of the rear frame 201 via the mount rubbers 231. In the
state in which the battery table mount 251 has been installed in
the base frame 216, a prescribed gap (clearance) 325 is formed
between the battery table mount 251 and the base frame 216. During
the operation of the hydraulic shovel 1, the gap 325 functions as
an air intake channel when the air around the battery modules 202
is heated due to the heating of the battery modules 202 and flows
upward through the vent holes 265, 273, 283 and 293, by which the
cooling of the battery modules 202 can be performed
efficiently.
[0119] The base plate 213 of the base frame 216 is a two-stage
structure including a lower plate 213a and an upper plate 213b. The
interior surface (upper surface) of the lower plate 213a is
reinforced with two hollow square pipes 213c stretched in the
transverse direction. The exterior surface (lower surface) of the
lower plate 213a is flat and functions as a support part to be used
for setting the vehicle rear part 200 on the forks 327 (see FIG.
23) of a forklift when the vehicle rear part 200 is separated from
the vehicle main body 100 using the forklift.
[0120] FIG. 10 is a schematic diagram showing a state in which
battery modules 202 have been stored in the battery table mount
251. FIG. 11 is a schematic diagram showing a state in which
battery modules 202 have been mounted on the lowermost battery
table 252 and the loaded battery table 252 has been attached on the
battery table mount 251 shown in FIG. 10. FIG. 12 is a schematic
diagram showing a state in which battery modules 202 have been
mounted on the second battery table 253 and the loaded battery
table 253 has been attached on the lowermost battery table 252
shown in FIG. 11. The aforementioned FIG. 6 shows a state in which
battery modules 202 have been mounted on the third battery table
254 and the loaded battery table 254 has been attached on the
second battery table 253 shown in FIG. 12.
[0121] As shown in the figures, the battery support bolts 322
attached to the battery table mount 251 and the battery support
bolts 314 attached to the battery tables 252 to 254 are situated at
the corners (four corners) of the battery modules 202. Each battery
module 202 is held by the battery support bolts 314 or 322 and two
clamp bars 329 stretched diagonally with respect to the top surface
of the battery module 202. Each end of the clamp bar 329 is
attached and fixed to the top of a corresponding battery support
bolt 314 or 322.
[0122] FIGS. 13 to 16 are schematic diagrams showing the details of
a method for attaching a battery module 202 to the third battery
table 254. Specifically, FIG. 13 shows a state in which a battery
module 202 has been detached from the right side plate 291c of the
third battery table 254. FIG. 14 shows a state in which a battery
module 202 has been attached to the right side plate 291c of the
third battery table 254. FIG. 15 shows coupling relationship among
the clamp bar 329, the battery support bolt 314 and the battery
module 202, wherein the left-hand side shows a state in which the
battery module 202 has been cramped and the right-hand side shows
an end of the clamp bar 329 and a connecting part of the battery
support bolt 314 in a disassembled state. FIG. 16 shows a state in
which a battery module 202 has been positioned and held by ribs 331
provided on the bottom of the central plate 291a of the third
battery table 254.
[0123] As shown in FIGS. 13 to 15, a bracket 333 is slid onto the
battery support bolt 314. At each of the four corners of the
battery module 202, a shoulder 202a to be in contact with the
bracket 333 is formed. Two ribs 331 (front, rear) are attached to
the front and rear of the right side plate 291c to adjoin the
framing member 292. Three ribs 331 (front, center, rear) are
attached to the front, center and rear of the central plate 291a.
On each of the front lower edge and the rear lower edge of the
battery module 202, a shoulder 202b (see FIG. 16) to be in contact
with the rib 331 is formed.
[0124] First, the battery module 202 is set on the right side plate
291c while aligning the shoulders 202b situated on the lower edges
of the battery module 202 with the ribs 331 on the right side plate
291c, by which the movement of the battery module 202 in the
longitudinal direction is restricted. In this state, the four
corners of the battery module 202 are in contact with or in close
vicinity of corresponding battery support bolts 314, respectively.
Subsequently, the brackets 333 are slid onto the battery support
bolts 314, respectively, to let the brackets 333 be supported on
the shoulders 202a at the four corners of the battery module 202.
Subsequently, the two clamp bars 329 are stretched diagonally on
the battery module 202 and the battery support bolts 314 are
inserted into holes at the ends of the clamp bars 329 to make the
battery support bolts 314 hold and support the two clamp bars 329.
The clamp bars 329 serve as supports for preventing the brackets
333 from being detached outward. Subsequently, double lock nuts 335
are screwed onto a threaded part formed at the upper end of each
battery support bolt 314 and the lock nuts 335 are tightened up.
Consequently, the brackets 333 are pressed against the shoulders
202a at the four corners of the battery module 202 and the movement
of the battery module 202 in the vertical direction is restricted.
The battery module 202 can be detached by reversely conducting the
above steps.
[0125] As shown in FIG. 16, two battery modules 202 are mounted on
the central plate 291a of the third battery table 254. Also in this
case, each battery module 202 can be attached according to the same
procedure as the above explanation regarding the attachment of one
battery module. In this case where two battery modules 202 are
attached, however, two central battery support bolts 314 are shared
by the two battery modules 202. Specifically, a bracket (not
shown), having a shape fitting with two shoulders 202a at adjoining
corners of the two battery modules 202, is slid onto each of the
central battery support bolts 314 and the double lock nuts 335 are
tightened up, by which the two battery modules 202 are held down
together and their vertical movement is restricted.
[0126] The mounting of battery modules on the battery table mount
251 can also be conducted similarly by use of the battery support
bolts 322, the ribs 321 and the clamp bars 329.
[0127] Next, an example of a procedure for assembling the battery
storage structure 203 storing the battery device 31 in this
embodiment configured as above will be explained below.
[0128] First, the battery modules 202 are mounted and fixed on the
battery table mount 251, the lowermost battery table 252, the
second battery table 253 and the third battery table 254 by the
above method explained referring to FIGS. 13 to 16.
[0129] Subsequently, the battery table mount 251, the lowermost
battery table 252, the second battery table 253 and the third
battery table 254 are stacked up and fixed one by one by the method
explained referring to FIG. 6 and FIGS. 10 to 12, by which the
battery storage structure 203 storing the battery device 31 is
completed.
[0130] Thereafter, the completed battery storage structure 203 is
mounted and fixed on the rear frame 201 of the vehicle rear part
200.
[0131] The stacking of the battery table mount 251 and the battery
tables 252 to 254 and the mounting of the battery storage structure
203 on the rear frame 201 can be performed with ease by using a
crane and the wires 311 attached to the wire attaching parts 312.
The same goes for the detaching of the battery storage structure
203 from the base frame 216 and the separation of the battery table
mount 251 and the battery tables 252 to 254.
[0132] FIGS. 17 and 18 are schematic diagrams showing the mounting
of the completed battery storage structure 203 on the rear frame
201 of the vehicle rear part 200, wherein FIG. 17 shows a state
just before the battery storage structure 203 is mounted on the
base frame 216 of the rear frame 201 and FIG. 18 shows a state in
which the battery storage structure 203 has been mounted on the
base frame 216. In FIGS. 17 and 18, the battery modules 202 are
unshown for convenience of illustration.
[0133] As mentioned above, the mount rubbers 231 have been attached
to the horizontal flanges 214a and 214b of the base frame 216 via
the reinforcing plates 230a and 230b, with the mount bolts 234
protruding from the mount rubbers 231.
[0134] The battery storage structure 203 is mounted on the
horizontal flanges 214a and 214b of the base frame 216 by lowering
the battery storage structure 203 and inserting the mount bolts 234
of the base frame 216 into bolt holes 256 formed in flange parts
251a and 251b of the battery table mount 251. Then, nuts are
attached to the mount bolts 234 and tightened up, by which the
battery storage structure 203 is connected and integrated with the
base frame 216. Conversely, by loosening and removing the nuts from
the mount bolts 234 and lifting the battery storage structure 203,
the battery storage structure 203 can be detached from the base
frame 216.
[0135] Incidentally, instead of completing the battery storage
structure 203 and thereafter mounting the completed battery storage
structure 203 on the base frame 216 of the rear frame 201 as
explained above, it is also possible to complete the battery
storage structure 203 on the base frame 216, by successively
mounting the battery table mount 251 and the battery tables 252 to
254 on the base frame 216 while attaching the battery modules 202
on each mount/table.
[0136] Next, a procedure for mounting and fixing the rear frame 201
that is loaded with the battery storage structure 203 as above, on
the vehicle main body 100 will be explained referring to FIGS. 19
to 23.
[0137] FIG. 19 is a schematic diagram showing a state just before
the rear frame 201 loaded with the battery storage structure 203 is
mounted on the swing frame 101 (main frame 120) of the vehicle main
body 100. FIG. 20 is a schematic diagram showing a state in which
the rear frame 201 has been mounted on the swing frame 101 (main
frame 120) of the vehicle main body 100. FIG. 21 is a schematic
diagram magnifying a connecting part between the rear frame 201 and
the swing frame 101 (main frame 120) using the positioning pins
301a and 301b and the bolt 302. In FIGS. 19-21, the battery modules
202 and parts of the vehicle main body 100 exclusive of the swing
frame 101 are unshown for convenience of illustration.
[0138] As mentioned above, the pin holes 155a and 155b and the
holes 156 have been formed through the longitudinal ribs 122a and
122b of the main frame 120 of the swing frame 101, and the pin
holes 222a and 222b and the bolt hole 223 have been formed through
the side plates 211a and 211b of the base frame 216 of the rear
frame 201. The support plates 158a and 158b each having the guiding
part formed by the lower surface of its tip, have been attached to
the front parts of the medial surfaces of the longitudinal ribs
122a and 122b, and the insertion support plates 221a and 221b have
been attached to the lateral surfaces of the side plates 211a and
211b of the base frame 216.
[0139] The rear frame 201 loaded with the battery storage structure
203 is put on the longitudinal ribs 122a and 122b of the main frame
120 of the vehicle main body 100 by lowering the rear frame 201 and
making the horizontal flanges 214a and 214b of the base frame 216
be supported on the upper ends of the longitudinal ribs 122a and
122b of the main frame 120. Subsequently, the side plates 211a and
211b of the rear frame 201 are gradually inserted into the main
frame 120, by which the insertion support plates 221a and 221b, the
plates being attached to the lateral surfaces of the side plates
211a and 211b, slide along and under the support plates 158a and
158b, the plates being attached to the medial surfaces of the
longitudinal ribs 122a and 122b, with the upper surfaces of the
tips of the insertion support plates 221a and 221b sliding along
the slanted guiding parts of the support plates 158a and 158b.
After the side plates 211a and 211b of the rear frame 201 have been
inserted in the main frame 120, the movement of the rear frame 201
in the vertical direction is restricted.
[0140] Subsequently, the positions of the base frame 216 (rear
frame 201) and the main frame 120 (vehicle main body 100) are
adjusted so that the pin holes 222a and 222b of the side plates
211a and 211b of the base frame 216 are aligned with the pin holes
155a and 155b of the longitudinal ribs 122a and 122b of the main
frame 120. Then, the rear frame 201 loaded with the battery storage
structure 203 is connected and integrated with the swing frame 101
of the vehicle main body 100 by inserting the positioning pins 301a
and 301b into the pin holes 155a and 155b and the pin holes 222a
and 222b, inserting the bolt 302 into the hole 156 and the bolt
hole 223, and tightening up the bolt 302. In this state, the
movement of the rear frame 201 in the vertical and longitudinal
directions is restricted by the positioning pins 301a and 301b, and
the movement of the rear frame 201 in the transverse direction is
restricted by the bolt 302.
[0141] The mounting of the rear frame 201 on the swing frame 101
can be conducted with ease by attaching the wires 311 (see FIG. 22)
to some wire attaching parts selected from the wire attaching parts
220a and 220b at the upper ends of the rear posts 218a and 218b and
the wire attaching parts 312 of the battery tables 252 to 254 of
the battery storage structure 203 (e.g., the wire attaching parts
220a and 220b of the rear posts 218a and 218b and the wire
attaching parts 312 of the uppermost battery table 254) and pulling
up the wires 311 using a crane.
[0142] FIG. 22 is a schematic diagram showing the mounting, on the
swing frame 101 using a crane, of the rear frame 201 that is loaded
with the battery storage structure 203. Since the rear posts 218a
and 218b of the rear frame 201 and the battery storage structure
203 in this embodiment are equipped with the wire attaching parts
220a, 220b and 312 as shown in FIG. 22, the mounting of the rear
frame 201 can be conduct with ease by attaching the wires 311 to
arbitrarily selected wire attaching parts 220a, 220b, 312 and
pulling up the wires 311 using a crane. The same goes for the
detaching of the rear frame 201 from the swing frame 101.
[0143] FIG. 23 is a schematic diagram showing the mounting, on the
swing frame 101 using a forklift, of the rear frame 201 that is
loaded with the battery storage structure 203. Since the support
part 328 to be used for setting the rear frame 201 on the forks 327
of a forklift is provided on the lower surface of the base frame
216 (lower surface of the lower plate 213a of the base plate 213)
and between the longitudinal ribs 122a and 122b of the swing frame
101 in this embodiment as shown in FIG. 23, the mounting of the
rear frame 201 can be conduct with ease also by using a forklift.
The same goes for the detaching of the rear frame 201 from the
swing frame 101.
[0144] The rear cover 205 may either be attached immediately after
the completion of the battery storage structure 203 or after
mounting and fixing the rear frame on the swing frame.
[0145] By this embodiment configured as above, the following
effects are achieved:
[0146] 1. The upper swing structure 3 as the vehicle body of the
hydraulic shovel 1 is made up of the vehicle main body 100 and the
vehicle rear part 200, and the hydraulic shovel 1 is configured so
that the vehicle rear part 200 is detachable from the vehicle main
body 100 by removing the positioning pins 301a and 301b and the
bolt 302. Therefore, the replacement of the vehicle rear part 200
is facilitated. Even when the electric hydraulic shovel 1 is used
for operations for a long time at a place where no commercial power
supply is available, the battery device 31 can be replaced easily
and quickly and the working efficiency can be increased by
preparing another vehicle rear part 200 loaded with a recharged
battery device 31, detaching the already-attached vehicle rear part
200 from the vehicle main body 100 when the electricity amount of
the battery device 31 on the vehicle rear part 200 has become
insufficient, and attaching, to the vehicle main body 100, the
prepared vehicle rear part 200 loaded with the recharged battery
device 31.
[0147] 2. The maintenance of the battery device 31 can also be done
with ease, by replacing the vehicle rear part 200 with another
vehicle rear part 200 loaded with a recharged battery device 31 and
moving the detached vehicle rear part 200 to maintenance
facilities.
[0148] 3. When a battery device 31 of a different type has to be
mounted, the vehicle rear part 200 loaded with the currently used
battery device 31 is detached from the vehicle main body 100 and
another vehicle rear part 200 loaded with the battery device 31 of
the different type is attached to the vehicle main body 100.
Therefore, the battery device 31 can easily be replaced with
different types of battery devices according to the progress of the
battery technology.
[0149] 4. The rear frame 201 of the vehicle rear part 200 can be
formed in various shapes differing in the length in the
longitudinal direction, by which the number of the mounted
batteries can be changed and adjusted to suit the operating time
required of the electric hydraulic shovel.
[0150] 5. The battery room 204 is formed inside the rear cover 205.
Therefore, the battery device 31 can be protected from shocks from
the outside during the swing of the upper swing structure 3
(vehicle body). By forming the vehicle rear part 200 in a shape
imitating the counter weight, an external appearance having
innovativeness can be given to the electric hydraulic shovel.
[0151] 6. The two longitudinal ribs 122a and 122b overhanging and
extending to the underside of the vehicle rear part 200 are
provided in the rear part of the main frame 120 of the vehicle main
body 100. The rear frame 201 of the vehicle rear part 200 is
equipped with the base frame 216 which couples with the two
longitudinal ribs 122a and 122b of the main frame 120 from above.
The base frame 216 mounted on the two longitudinal ribs 122a and
122b of the main frame 120 is fixed on the two longitudinal ribs
122a and 122b. Therefore, the movement of the rear frame 201 in the
transverse direction is restricted by the base frame 216 and the
two longitudinal ribs 122a and 122b of the main frame 120.
Consequently, the vehicle rear part 200 can be held and fixed
stably with respect to the vehicle main body 100.
[0152] 7. The base frame 216 mounted on the two longitudinal ribs
122a and 122b of the main frame 120 is fixed on the two
longitudinal ribs 122a and 122b and prevented from coming off using
the positioning pins 301a and 301b and the bolt 302. The whole of
the vehicle rear part 200 is detachable from the two longitudinal
ribs 122a and 122b by removing the positioning pins 301a and 301b
and the bolt 302. Therefore, the whole of the vehicle rear part 200
can be attached to and detached from the vehicle main body 100 with
ease while leaving the battery device 31 mounted on the vehicle
rear part 200.
[0153] 8. The rear frame 201 is mounted on the two longitudinal
ribs 122a and 122b of the main frame 120 by making the horizontal
flanges 214a and 214b of the base frame 216 be supported on the
upper ends of the two longitudinal ribs 122a and 122b. Therefore,
the movement of the rear frame 201 in the transverse direction is
restricted by the two side plates 211a and 211b of the base frame
216 and the two longitudinal ribs 122a and 122b of the main frame
120, and the movement of the rear frame 201 in the vertical
direction is restricted by the horizontal flanges 214a and 214b of
the base frame 216 and the two longitudinal ribs 122a and 122b of
the main frame 120. Consequently, the vehicle rear part 200 can be
stably fixed to the vehicle main body 100.
[0154] 9. The support part to be used for setting the vehicle rear
part 200 on the forks 327 of a forklift is provided on the lower
surface of the base frame 216 (lower surface of the lower plate
213a of the base plate 213) and between the two longitudinal ribs
122a and 122b of the main frame 120. The vehicle rear part 200 is
movable with respect to the vehicle main body 100 using the
forklift. Therefore, the vehicle rear part 200 can be replaced
safely by use of a forklift even when the vehicle rear part 200
loaded with the battery device 31 is heavy.
[0155] 10. The vehicle rear part 200 and the battery storage
structure 203 are equipped with the wire attaching parts 220a, 220b
and 312. The vehicle rear part 200 is movable with respect to the
vehicle main body 100 using a crane. Therefore, the vehicle rear
part 200 can be replaced safely by use of a crane even when the
vehicle rear part 200 loaded with the battery storage structure 203
is heavy.
[0156] 11. The base frame 216 is provided with a plurality of mount
rubbers 231. The battery storage structure 203 is attached on the
base frame 216 with the mount bolts 234 via the mount rubbers 231.
Therefore, vertical vibrations of the battery storage structure 203
and the battery device 31 during the operation of the hydraulic
shovel 1 are absorbed, by which the battery device 31 and the
battery storage structure 203 can be protected from vertical
operating vibrations of the hydraulic shovel 1.
[0157] 12. By standardizing the lowermost attaching part of the
battery storage structure 203 (i.e., the battery table mount 251),
it becomes possible to mount various types of battery storage
structures differing in the configuration. Consequently, various
types of batteries can easily be mounted according to the progress
of the battery technology.
[0158] 13. The battery storage structure 203 is equipped with a
plurality of wire attaching parts 312. The battery storage
structure 203 is movable in the vertical direction with respect to
the base frame 216 by using a crane. Therefore, the battery storage
structure 203 can be replaced safely by use of a crane even when
the battery storage structure 203 loaded with the battery device 31
is heavy.
[0159] 14. The battery storage structure 203 is made up of the
battery table mount 251 and multiple stages of battery tables 252
to 254. The battery table mount 251 and the multiple stages of
battery tables 252 to 254 are supported and fixed to be separate
from each other in the vertical direction via the posts 276a, 286a,
287a and 287b. Therefore, a lot of battery modules can be mounted
and the attaching/detaching of the battery modules can be conducted
safely and easily.
[0160] 15. The rear cover 205 of the vehicle rear part 200 covers a
rear part, a right-hand part, a left-hand part and a top part of
the vehicle rear part 200. The machine room 103 is separated from
the other parts of the vehicle main body 100 by the partition
plates 151 and 152. When the vehicle rear part 200 is connected
with the vehicle main body 100, the battery room 204 is insulated
by the partition plates 151 and 152 from heat sources such as the
electric motor 18, the inverter 19, etc., in the machine room 103
and a space preventing effects of heat on the battery modules 202
of the battery device 31 arranged in the battery room 204 is
secured. Therefore, the temperature rise as a cause of
deterioration of the battery device 31 can be prevented.
[0161] Incidentally, while the overhanging part 122 of the main
frame 120 is formed by the two longitudinal ribs 122a and 122b in
the above embodiment, the overhanging part 122 may be configured
differently as long as the structure of the overhanging part 122
can support the base frame 216 of the vehicle rear part 200. For
example, the overhanging part 122 can be a frame structure having a
part supporting the base frame 216. The overhanging part 122 may
also be formed of three longitudinal ribs including a third
longitudinal rib that supports the central part of the base frame
216. The base frame 216 in the above embodiment includes the two
side plates 211a and 211b to be arranged inside the two
longitudinal ribs 122a and 122b of the main frame 120, the base
plate 213 connecting the lower ends of the two side plates 211a and
211b, and the outward horizontal flanges 214a and 214b provided at
the upper ends of the two side plates 211a and 211b, respectively,
and the rear frame 201 is mounted on the two longitudinal ribs 122a
and 122b by making the horizontal flanges 214a and 214b be
supported on the upper ends of the two longitudinal ribs 122a and
122b. However, the present invention is not to be restricted to
this configuration. For example, the base frame 216 may include two
side plates to be arranged outside the two longitudinal ribs 122a
and 122b of the main frame 120 and a top plate connecting the upper
ends of the side plates, and the rear frame 201 may be mounted on
the two longitudinal ribs 122a and 122b by making the top plate be
supported on the upper ends of the two longitudinal ribs 122a and
122b.
[0162] Further, while the battery storage structure 203 in the
above embodiment includes the battery table mount 251 and the
battery tables 252 to 254, the number of stages of the battery
tables 252 to 254 may be changed properly, depending on the number
of batteries to be mounted. The configuration of the battery tables
252 to 254 may also be changed properly, depending on the type of
the battery device to be mounted.
[0163] Furthermore, while the hydraulic shovel 1 has been
illustrated in the above embodiment as an example of the electric
construction machine, the present invention is not to be restricted
to hydraulic shovels; the present invention is applicable also to a
wide range of other construction machines such as wheel loaders,
hydraulic cranes, etc.
DESCRIPTION OF REFERENCE CHARACTERS
[0164] 1 electric hydraulic shovel [0165] 2 lower travel structure
(vehicle body) [0166] 3 upper swing structure (vehicle body) [0167]
4 work implement [0168] 17 hydraulic pump [0169] 18 electric motor
[0170] 19 inverter [0171] 20 oil tank [0172] 22 oil cooler [0173]
23 radiator [0174] 30 cooling fan [0175] 31 battery device [0176]
100 vehicle main body [0177] 101 swing frame (vehicle body frame)
[0178] 102 cab seat [0179] 103 machine room [0180] 104 canopy
[0181] 110 exterior cover [0182] 120 main frame [0183] 130, 140
side frame [0184] 122a, 122b longitudinal rib [0185] 151, 152
partition plate [0186] 200 vehicle rear part [0187] 201 rear frame
[0188] 202 battery module [0189] 203 battery storage structure
[0190] 204 battery room [0191] 205 rear cover [0192] 211a, 211b
side plate [0193] 212a front plate [0194] 212b rear plate [0195]
213 base plate [0196] 214a, 214b horizontal flange [0197] 216 base
frame [0198] 217a, 217b outer frame [0199] 218a, 218b post [0200]
219a, 219b guard pipe [0201] 220a, 220b wire attaching part [0202]
231 mount rubber [0203] 232, 233 guide plate [0204] 234 mount bolt
[0205] 251 battery table mount [0206] 252 first (lowermost) battery
table [0207] 253 second battery table [0208] 254 third battery
table [0209] 261a, 261b side plate [0210] 262a front plate [0211]
262b rear plate [0212] 263 base plate [0213] 264a, 264b horizontal
flange [0214] 265, 273, 283, 293 vent hole [0215] 276a,286a, 287a,
287b post [0216] 301a,301b positioning pin [0217] 302 bolt [0218]
311 wire [0219] 312 wire attaching part [0220] 314, 322 battery
support bolt [0221] 321, 331 rib [0222] 327 forks of a forklift
[0223] 329 clamp bar
* * * * *