U.S. patent application number 10/886458 was filed with the patent office on 2005-05-19 for electric twin flow pump apparatus.
Invention is credited to Ji, Sang Woo.
Application Number | 20050103286 10/886458 |
Document ID | / |
Family ID | 34567808 |
Filed Date | 2005-05-19 |
United States Patent
Application |
20050103286 |
Kind Code |
A1 |
Ji, Sang Woo |
May 19, 2005 |
Electric twin flow pump apparatus
Abstract
An electric twin flow pump apparatus configured to include a
housing wherein a transmission oil passage and a water jacket are
separately formed; a motor wherein one side of the housing is
mounted and its drive shaft passes through the oil passage and
water jacket and extends to the other side of the housing; a first
impeller that is coaxially secured at the drive shaft and located
in the water jacket path; and a second impeller that is coaxially
secured at the drive shaft and located in the oil passage so as to
provide a twin flow pump that has formed an electric oil pump and
an electric water pump as one body.
Inventors: |
Ji, Sang Woo; (Whasung-city,
KR) |
Correspondence
Address: |
MORGAN, LEWIS & BOCKIUS LLP (SF)
2 PALO ALTO SQUARE
PALO ALTO
CA
94306
US
|
Family ID: |
34567808 |
Appl. No.: |
10/886458 |
Filed: |
July 7, 2004 |
Current U.S.
Class: |
123/41.44 ;
123/196R; 417/321 |
Current CPC
Class: |
F16H 57/0434 20130101;
F01P 5/10 20130101; F01M 2001/0215 20130101; F01P 7/165 20130101;
F04D 13/14 20130101; F02B 77/14 20130101 |
Class at
Publication: |
123/041.44 ;
123/196.00R; 417/321 |
International
Class: |
F01P 005/10; F04B
017/00; F01B 023/08 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 18, 2003 |
KR |
10-2003-0081838 |
Claims
What is claimed is:
1. An electric twin flow pump apparatus, comprising: a housing
wherein a transmission oil passage and a water jacket are
separately formed; a motor wherein one side of the housing is
mounted with a drive shaft passing through the oil passage and
water jacket and extending to an opposite side of the housing; a
first impeller that is coaxially secured on the drive shaft and
located in the water jacket; and a second impeller that is
coaxially secured on the drive shaft and located in the oil
passage.
2. The electric twin flow pump apparatus according to claim 1,
wherein the motor is driven if the temperature of the cooling water
exceeds a temperature setting or if an associated engine is in the
idle stop mode.
3. The electric twin flow pump apparatus according to claim 2,
wherein bearings are further included in the opposite side of the
housing that supports the drive shaft.
4. The electric twin flow pump apparatus according to claim 3,
wherein one or more sealing members are furnished in the
housing.
5. The electric twin flow pump apparatus according to claim 4,
wherein the motor is furnished as a DC motor.
6. An electric twin flow pump apparatus, comprising: a housing
wherein a transmission oil passage and a water jacket are
separately formed; a motor interposed between the oil passage and
the water jacket and mounted at the housing with a drive shaft
passing through the oil passage and the water jacket and extending
to both ends of the housing; a first impeller that is coaxially
secured on the drive shaft and located in the said water jacket;
and a second impeller that is coaxially secured on the drive shaft
and located in the oil passage.
7. The electric twin flow pump apparatus according to claim 6,
wherein the motor is driven if the temperature of the cooling water
exceeds a temperature setting or if an associated engine is in the
idle stop mode.
8. The electric twin flow pump apparatus according to claim 7,
wherein bearings are further included that support the drive shaft
of the motor to enable its rotation at both ends of the
housing.
9. The electric twin flow pump apparatus according to claim 8,
wherein one or more sealing members are furnished in the
housing.
10. The electric twin flow pump apparatus according to claim 9,
wherein the motor is furnished as a DC motor.
11. An electric twin flow pump apparatus, comprising: a housing
including separately a formed transmission oil passage and water
jacket, wherein said oil passage and water jacket each define an
impeller chamber formed around a common axis; a first impeller
disposed in the water jacket impeller chamber configured and
dimensioned for pumping water; a second impeller disposed in the
oil passage impeller chamber configured and dimensioned for pumping
transmission oil; at least one drive shaft extending between said
impellers along said common axis for driving said impellers; and a
motor operatively connected to said at least one drive shaft.
12. The pump apparatus of claim 11, wherein said motor is disposed
to one side of said housing and a single drive shaft extends from
the motor through one impeller to the other impeller.
13. The pump apparatus of claim 12, further comprising a shaft
supporting bearing mounted on the housing opposite said motor.
14. The pump apparatus of claim 11, wherein said motor is disposed
between said impeller chambers and drive shafts extend from
opposite sides of the motor to the first and second impellers.
15. The pump apparatus of claim 14, further comprising first and
second shaft supporting bearings mounted on opposite sides of said
impeller chambers from said motor.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority of Korean Application No.
10-2003-0081838, filed Nov. 18, 2003, the disclosure of which is
incorporated herein by reference.
BACKGROUND OF THE INVENTION
[0002] (a) Field of the Invention
[0003] This invention relates to pumps for vehicles, and more
specifically to an electric twin flow pump apparatus including an
electric water pump and an electric oil pump.
[0004] (b) Description of the Related Art
[0005] In general, a 14V power system uses vehicles, and the
maximum power that may be supplied by a 14V power system is known
to be approximately 2.5 KW. However, a number of various electric
and electronic equipment of new technologies are recently mounted
in a vehicle, and the said 14V power system cannot supply a stable
voltage to the new equipment. Therefore, a power system whose
battery voltage has been boosted to a high voltage of 24V or higher
(for example, 35V or 42V) has been recently researched.
[0006] In the case of the 42V vehicle, an idle stop mode has been
adopted as a method to prevent air pollution and reduce fuel
consumption. The idle stop is a function that does not place an
engine in an idle condition but stops it if a vehicle stops.
Specifically, the engine is automatically stopped based on a signal
concerning the vehicle speed from a vehicle speed sensor without
manipulating an ignition switch. The engine is re-started based on
a signal from the accelerator pedal sensor that detects
manipulation of an accelerator pedal, and emission of air pollution
materials such as carbon dioxide may be suppressed.
[0007] However, the engine stops under the condition of idle stop,
and, as a result, it becomes impossible to drive a peripheral
device that is driven by belt driving of an engine, for example a
transmission oil pump. On the other hand, if an engine is restarted
under the condition of idle stop, it becomes necessary to input oil
into a transmission to prevent a change speed shock in the
transmission. Therefore, usage of an electric oil pump is being
considered that may be driven under the condition of idle stop.
[0008] In addition, an additional sub-cooling system is configured
for the 42V vehicle to cool down peripheral devices following
adoption of a 42V power system. Thus, a water pump to be used needs
to be installed with an electric pump as well.
SUMMARY OF THE INVENTION
[0009] Embodiments of the present invention provide a twin flow
pump in which an electric oil pump and an electric water pump are
formed as one body. In a preferred embodiment, an electric twin
flow pump apparatus according to this invention includes a housing
wherein a transmission oil passage and a water jacket are
separately formed; a motor wherein one side of the housing is
mounted and its drive shaft passes through the oil passage and
water jacket and extends to the other side of the housing; a first
impeller that is coaxially secured at the drive shaft and located
in the water jacket path; and a second impeller that is coaxially
secured at the drive shaft and located in the oil passage.
[0010] In an alternative embodiment, an electric twin flow pump
apparatus according to this invention includes a housing wherein a
transmission oil passage and a water jacket are separately formed;
a motor wherein it is interposed between the oil passage and the
water jacket and mounted at the housing, but its drive shaft passes
through the oil passage and the water jacket and extends to both
ends of the housing; a first impeller that is coaxially secured at
the drive shaft and located in the water jacket path; and a second
impeller that is coaxially secured at the drive shaft and located
in the oil passage.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] FIG. 1 is a schematic drawing illustrating a configuration
of an electric twin flow apparatus according to a first embodiment
of this invention;
[0012] FIG. 2 is a schematic drawing illustrating a configuration
of the electric twin flow pump apparatus according to a second
embodiment of this invention;
[0013] FIG. 3 is a graph illustrating operating conditions of an
electric twin flow pump apparatus concerning cooling water
temperatures; and
[0014] FIG. 4 is a graph illustrating operating conditions of an
electric twin flow pump apparatus concerning the idle stop.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0015] The following describes the embodiments of this invention in
reference to the drawings attached.
[0016] FIG. 1 illustrates a configuration of an electric twin flow
pump apparatus of a 42V vehicle according to a first embodiment of
this invention. As illustrated in FIG. 1, a water jacket (110) and
an oil passage (120) are respectively formed in the housing of the
electric twin flow pump (100). Each forms a chamber on a common
axis for containing an impeller. A motor (200) is mounted in one
side of the housing (100). A drive shaft (210) of the motor (200)
passes through the water jacket (110) and the oil passage (120) and
extends to the other side of the housing (100). The motor (200)
includes a coil (230) and a rotor (220), and the drive shaft (210),
if a power source is applied to a coil, rotates with the rotor
(220). Preferably, a bearing (300) is furnished on the other side
of the housing (100) and supports the drive shaft (210)
extended.
[0017] A first impeller (400) is coaxially secured at the location
where it passes through the water jacket (110) of the drive shaft
(210). A second impeller (500) is coaxially secured on the drive
shaft (210) at the location where it passes through the oil passage
(120) of the drive shaft (210). Furthermore, a sealing member (610,
620) is mounted in the housing (100) to prevent cooling water or
oil from leaking outside the housing.
[0018] Examining the water jacket (110) and the oil passage (120)
in detail, the water jacket (110) forms a passage for cooling water
of a cooling water system that has been additionally configured to
cool down peripheral devices following adoption of a 42V power
system. Cooling water flows in the cooling water system to cool
down MCU, DC/DC converter, inverter, etc. In addition, the oil
passage (120) is a passage for oil supplied to a transmission to
prevent change speed shock of a transmission at the idle stop mode
of an engine and when idle stop condition is changed to an
operation condition.
[0019] FIG. 2 illustrates a configuration of an electric twin flow
pump apparatus of a 42V vehicle according to a second embodiment of
this invention. In this embodiment, the location of motor (200a)
mounted on a housing (100a) has been changed; however, the housing
still defines two impeller chambers on a common axis. Comparing
this with the prior embodiment, motor (200a) is mounted at the
center of housing (100a). Drive shaft (210a, 210b) of motor (200a)
is extended to both ends of a housing (100a) in this embodiment. In
addition, the drive shafts (210a, 210b) extending to both ends of
the housing (100) have a structure that is supported respectively
by bearings (300a, 300b) so as to allow rotation. Therefore, it has
the shape that a water jacket (110a) and an oil passage (120a) are
located at both sides centering on the motor (100a).
[0020] If the motor is driven, the first impeller and the second
impeller coaxially secured at the drive shaft begin to rotate, and
cooling water and oil is forced to circulate. If the temperature of
cooling water exceeds the temperature setting, the motor operates
based on the temperature, or, if the idle stop condition of an
engine is changed to an operation condition, it is driven to supply
oil of the hydraulic pressure setting to a transmission. The
cooling water temperature condition that requires supply of the
cooling water and the idle stop condition that requires supply of
the oil may not be satisfied at the same time, so the motor is
controlled based on one of the two conditions.
[0021] FIG. 3 is a graph concerning the cooling water condition
under which the motor is driven. As illustrated in FIG. 3, the
motor is driven if the temperature of cooling water exceeds
53.degree. C., and, if the first impeller is rotated by driving the
motor, cooling water cools down peripheral devices of a 42V system
circulating a cooling system.
[0022] On the other hand, in FIG. 4 is a graph concerning the idle
stop mode under which the motor is driven. As illustrated in FIG.
4, if the supply of oil with an oil setting is required, it marks
the idle stop condition and the time at which an idle stop mode is
changed to an operation condition. Afterward, oil supply takes
place by a mechanical oil pump.
[0023] Based on the transmission fluid pressure curve illustrated
in FIG. 4, the motor (200) is driven as low duty at an idle stop
mode and as high duty when an idle stop mode is changed to an
operation condition to rotate the second impeller.
[0024] It is self-evident that the second embodiment may also be
controlled by the same method of the first embodiment, so further
explanation is omitted. According to the electric twin flow pump
apparatus based on this invention, it provides a twin flow pump
that has formed an electric oil pump and an electric water pump as
one body to promote reduction of a number of parts and
simplification of a structure.
* * * * *