U.S. patent application number 13/937819 was filed with the patent office on 2014-04-10 for pump apparatus.
The applicant listed for this patent is Hitachi Automotive Systems, Ltd.. Invention is credited to Yoshiki SAKAMOTO, Hideaki TAKAHASHI.
Application Number | 20140099227 13/937819 |
Document ID | / |
Family ID | 49965671 |
Filed Date | 2014-04-10 |
United States Patent
Application |
20140099227 |
Kind Code |
A1 |
TAKAHASHI; Hideaki ; et
al. |
April 10, 2014 |
PUMP APPARATUS
Abstract
A pump apparatus includes: a housing; a pump unit; a suction
passage; a discharge passage member including a discharge hydraulic
passage which is formed therein, and which is arranged to discharge
the hydraulic fluid pressurized by the pump unit to an outside of
the housing; a first discharge passage insertion hole which is
formed in the pump unit, and into which the discharge passage
member is inserted through an elastic member; a second discharge
passage insertion hole which is formed in the housing, and into
which the discharge passage member is inserted through an elastic
member; and an axial position adjusting mechanism arranged to
adjust an axial position of the discharge passage member within the
first discharge passage insertion hole and the second discharge
passage insertion hole.
Inventors: |
TAKAHASHI; Hideaki;
(Atsugi-shi, JP) ; SAKAMOTO; Yoshiki;
(Hitachi-shi, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Hitachi Automotive Systems, Ltd. |
Hitachinaka-shi |
|
JP |
|
|
Family ID: |
49965671 |
Appl. No.: |
13/937819 |
Filed: |
July 9, 2013 |
Current U.S.
Class: |
418/206.4 |
Current CPC
Class: |
F04C 11/003 20130101;
F04C 29/12 20130101; F04B 53/22 20130101; F04B 53/16 20130101 |
Class at
Publication: |
418/206.4 |
International
Class: |
F04C 29/12 20060101
F04C029/12; F04C 11/00 20060101 F04C011/00 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 7, 2012 |
JP |
2012-154866 |
Claims
1. A pump apparatus comprising: a housing; a pump unit received
within a receiving portion which is formed in the housing, and
which constitutes a low pressure chamber; a suction passage which
is opened in an outer circumference of the pump unit, and which is
arranged to supply a hydraulic fluid into the pump unit; a
discharge passage member including a discharge hydraulic passage
which is formed therein, and which is arranged to discharge the
hydraulic fluid pressurized by the pump unit to an outside of the
housing; a first discharge passage insertion hole which is formed
in the pump unit, and into which the discharge passage member is
inserted through an elastic member; a second discharge passage
insertion hole which is formed in the housing, and into which the
discharge passage member is inserted through an elastic member; and
an axial position adjusting mechanism arranged to adjust an axial
position of the discharge passage member within the first discharge
passage insertion hole and the second discharge passage insertion
hole.
2. The pump apparatus as claimed in claim 1, wherein the axial
position adjusting mechanism is an elastic member arranged to apply
an elastic force to the discharge passage member.
3. The pump apparatus as claimed in claim 2, wherein the first
discharge passage insertion hole and the discharge passage member
are disposed with a gap therebetween; the second discharge passage
insertion hole and the discharge passage member are disposed with a
gap therebetween; and the pump apparatus further comprises a radial
position adjusting mechanism arranged to adjust a position
relationship between each of the first discharge passage insertion
hole and the second discharge passage insertion hole, and the
discharge passage member.
4. The pump apparatus as claimed in claim 1, wherein the pump
apparatus further comprises a closing member which is fixed to the
housing, and which closes the second discharge passage insertion
hole; and the axial position adjusting mechanism is disposed
between the discharge passage member and the closing member.
5. The pump apparatus as claimed in claim 4, wherein the pump
apparatus further comprises a damper chamber formed by the closing
member, the discharge passage member, and a wall surface of the
second passage member insertion hole.
6. The pump apparatus as claimed in claim 4, wherein the axial
position adjusting mechanism includes a plunger member arranged to
be moved in an axial direction relative to one of the discharge
passage member and the closing member; and the axial position
adjusting mechanism is arranged to adjust a relative position
between the plunger member, and the one of the discharge passage
member and the closing member.
7. The pump apparatus as claimed in claim 4, wherein the axial
position adjusting mechanism is a plate spring disposed in a
contracted state between the discharge passage member and the
closing member.
8. The pump apparatus as claimed in claim 4, wherein the axial
position adjusting mechanism is a coil spring disposed in a
contracted state between the discharge passage member and the
closing member.
9. The pump apparatus as claimed in claim 1, wherein the pump
apparatus further comprises an engagement portion which is formed
in the first discharge passage insertion hole, and with which the
discharge passage member is engaged; and the axial position
adjusting mechanism is an elastic member arranged to urge the
discharge passage member toward the engagement portion.
10. A pump apparatus comprising: a housing; a pump unit received
within a receiving portion which is formed in the housing, and
which constitutes a low pressure chamber; a discharge passage which
is arranged to discharge a hydraulic fluid pressurized by the pump
unit, through the housing to an outside of the housing; a discharge
passage member which constitutes the discharge passage, and which
includes a discharge hydraulic passage formed therein; a first
discharge passage insertion hole which is formed in the pump unit,
and into which an one end portion of the discharge passage member
is inserted through an elastic member; a second discharge passage
insertion hole which is formed in the housing, and into which the
other end portion of the discharge passage member is inserted
through an elastic member; an axial position adjusting mechanism
arranged to adjust an axial position of the discharge passage
member with respect to the first discharge passage insertion hole
and the second discharge passage insertion hole; and the first
discharge passage insertion hole and the discharge passage member
being disposed with a predetermined radial gap therebetween, the
second discharge passage insertion hole and the discharge passage
member being disposed with a predetermined radial gap therebetween,
a radial position adjusting mechanism arranged to adjust a radial
position relationship between the each of the first discharge
passage insertion hole and the second discharge passage insertion
hole, and the discharge passage member.
11. The pump apparatus as claimed in claim 10, wherein the axial
position adjusting mechanism is an elastic member arranged to apply
an elastic force to the discharge passage member.
12. The pump apparatus as claimed in claim 11, wherein the radial
position adjusting mechanism is an O-ring mounted on an outer
circumference of the discharge passage member; and the radial
position adjusting mechanism is arranged to adjust a size of the
radial gap by an elastic deformation of the O-ring.
13. The pump apparatus as claimed in claim 12, wherein the pump
apparatus further comprises a closing member which is fixed to the
housing, and which closes the second discharge passage insertion
hole; and the axial position adjusting mechanism is disposed
between the discharge passage member and the closing member.
14. The pump apparatus as claimed in claim 13, wherein the axial
position adjusting mechanism is a plate spring disposed in a
contracted state between the discharge passage member and the
closing member.
15. The pump apparatus as claimed in claim 13, wherein the pump
apparatus further comprises a damper chamber formed by the closing
member, the discharge passage member, and a wall surface of the
second passage member insertion hole.
16. A pump apparatus comprising: a housing; a pump unit which is
received in a receiving portion formed in the housing, and which
includes a low pressure portion and a high pressure portion formed
therein; a suction passage formed in the housing, and arranged to
supply a hydraulic fluid to the low pressure portion of the pump
unit; a low pressure chamber connected with the suction passage and
the low pressure portion, and formed between the pump unit and a
wall portion forming the receiving portion when the pump unit is
received in the receiving portion; a discharge passage arranged to
discharge the hydraulic fluid pressurized by the pump unit; a
connection pipe which constitutes the discharge passage, and which
passes through the low pressure chamber, and which connects the
housing and the high pressure chamber, a first connection pipe
insertion hole which is formed in the pump unit, and into which the
connection pipe is inserted through an elastic member; a second
connection pipe insertion hole which is formed in the housing, and
into which the connection pipe is inserted through the elastic
member; an axial position adjusting mechanism arranged to adjust an
axial position of the connection pipe with respect to the first
connection pipe insertion hole and the second connection pipe
insertion hole; and the first connection pipe insertion hole and
the connection pipe being disposed with a predetermined radial gap
therebetween, the second connection pipe insertion hole and the
connection pipe being disposed with a predetermined radial gap
therebetween, a radial position adjusting mechanism arranged to
adjust a radial position relationship between each of the first
connection pipe insertion hole and the second connection pipe
insertion hole, and the connection pipe.
17. The pump apparatus as claimed in claim 16, wherein the axial
position adjusting mechanism is an elastic member arranged to apply
an elastic force to the connection pipe.
18. The pump apparatus as claimed in claim 16, wherein the radial
position adjusting mechanism is an O-ring which is mounted on an
outer circumference of the discharge passage member; and the radial
position adjusting mechanism is arranged to adjust a size of the
radial gap by an elastic deformation of the O-ring.
19. The pump apparatus as claimed in claim 16, wherein the pump
apparatus further comprises a closing member which is fixed to the
housing, and which closes the second connection pipe insertion
hole; the axial position adjusting mechanism is disposed between
the connection pipe and the closing member; and the pump apparatus
further comprises a damper chamber formed by the closing member,
the connection pipe, and a wall surface of the second connection
pipe insertion hole.
Description
BACKGROUND OF THE INVENTION
[0001] This invention relates to a pump apparatus arranged to
discharge a desired hydraulic pressure by a pump.
[0002] U.S. Patent Application Publication No. 2011/0062773 A1
(corresponding to Japanese Patent Application Publication No.
2011-64147) discloses a conventional pump apparatus in which a
center plate is assembled to a housing, and a discharge portion
received in a receiving hole formed in the housing is inserted into
the center plate, so that a discharge passage confronts a low
pressure chamber, so as to decrease a size of the pump unit.
SUMMARY OF THE INVENTION
[0003] However, in the above-described conventional apparatus, the
assembly error and the dimension error of the housing and the
center plate are generated. Accordingly, it is difficult to ensure
the assembling characteristic (ease of assembly).
[0004] It is, therefore, an object of the present invention to
provide a pump apparatus devised to solve the above-mentioned
problem, and readily assemble the pump apparatus while suppressing
error.
[0005] According to one aspect of the present invention, a pump
apparatus comprises: a housing; a pump unit received within a
receiving portion which is formed in the housing, and which
constitutes a low pressure chamber; a suction passage which is
opened in an outer circumference of the pump unit, and which is
arranged to supply a hydraulic fluid into the pump unit; a
discharge passage member including a discharge hydraulic passage
which is formed therein, and which is arranged to discharge the
hydraulic fluid pressurized by the pump unit to an outside of the
housing; a first discharge passage insertion hole which is formed
in the pump unit, and into which the discharge passage member is
inserted through an elastic member; a second discharge passage
insertion hole which is formed in the housing, and into which the
discharge passage member is inserted through an elastic member; and
an axial position adjusting mechanism arranged to adjust an axial
position of the discharge passage member within the first discharge
passage insertion hole and the second discharge passage insertion
hole.
[0006] According to another aspect of the invention, a pump
apparatus comprises: a housing; a pump unit received within a
receiving portion which is formed in the housing, and which
constitutes a low pressure chamber; a discharge passage which is
arranged to discharge a hydraulic fluid pressurized by the pump
unit, through the housing to an outside of the housing; a discharge
passage member which constitutes the discharge passage, and which
includes a discharge hydraulic passage formed therein; a first
discharge passage insertion hole which is formed in the pump unit,
and into which an one end portion of the discharge passage member
is inserted through an elastic member; a second discharge passage
insertion hole which is formed in the housing, and into which the
other end portion of the discharge passage member is inserted
through an elastic member; an axial position adjusting mechanism
arranged to adjust an axial position of the discharge passage
member with respect to the first discharge passage insertion hole
and the second discharge passage insertion hole; and the first
discharge passage insertion hole and the discharge passage member
being disposed with a predetermined radial gap therebetween, the
second discharge passage insertion hole and the discharge passage
member being disposed with a predetermined radial gap therebetween,
a radial position adjusting mechanism arranged to adjust a radial
position relationship between the each of the first discharge
passage insertion hole and the second discharge passage insertion
hole, and the discharge passage member.
[0007] According to still another aspect of the invention, a pump
apparatus comprises: a housing; a pump unit which is received in a
receiving portion formed in the housing, and which includes a low
pressure portion and a high pressure portion formed therein; a
suction passage formed in the housing, and arranged to supply a
hydraulic fluid to the low pressure portion of the pump unit; a low
pressure chamber connected with the suction passage and the low
pressure portion, and formed between the pump unit and a wall
portion forming the receiving portion when the pump unit is
received in the receiving portion; a discharge passage arranged to
discharge the hydraulic fluid pressurized by the pump unit; a
connection pipe which constitutes the discharge passage, and which
passes through the low pressure chamber, and which connects the
housing and the high pressure chamber, a first connection pipe
insertion hole which is formed in the pump unit, and into which the
connection pipe is inserted through an elastic member; a second
connection pipe insertion hole which is formed in the housing, and
into which the connection pipe is inserted through the elastic
member; an axial position adjusting mechanism arranged to adjust an
axial position of the connection pipe with respect to the first
connection pipe insertion hole and the second connection pipe
insertion hole; and the first connection pipe insertion hole and
the connection pipe being disposed with a predetermined radial gap
therebetween, the second connection pipe insertion hole and the
connection pipe being disposed with a predetermined radial gap
therebetween, a radial position adjusting mechanism arranged to
adjust a radial position relationship between each of the first
connection pipe insertion hole and the second connection pipe
insertion hole, and the connection pipe.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] FIG. 1 is a hydraulic pressure circuit diagram showing a
brake hydraulic pressure control apparatus to which a pump
apparatus according to a first embodiment of the present invention
is applicable.
[0009] FIGS. 2A-2C are skeleton diagrams showing a housing of a
hydraulic pressure control unit in the brake hydraulic pressure
control apparatus of FIG. 1.
[0010] FIGS. 3A-3C are skeleton diagrams showing the housing when
viewed from directions different from FIGS. 2A-2C.
[0011] FIG. 4 is a perspective view showing the housing of FIGS.
2A-2C and FIG. 3A-3C.
[0012] FIG. 5 is a perspective view showing the housing of FIGS.
2A-2C and FIG. 3A-3C.
[0013] FIG. 6 is a perspective view showing the housing of FIGS.
2A-2C and FIG. 3A-3C.
[0014] FIG. 7 is a perspective view showing a pump unit and
discharge portions in the pump apparatus according to the first
embodiment of the present invention.
[0015] FIG. 8 is a sectional view showing a portion in a state
where the pump unit and the discharge portions are received within
the housing, in the pump apparatus according to the first
embodiment of the present invention.
[0016] FIG. 9 is a sectional view taken along a section line A-A of
FIG. 8.
[0017] FIG. 10 is an enlarged sectional view showing a portion near
the discharge portion.
[0018] FIG. 11 is an enlarged sectional view showing a portion near
a discharge portion in a pump apparatus according to a second
embodiment of the present invention.
[0019] FIG. 12 is an enlarged sectional view showing a portion near
a discharge portion in a pump apparatus according to a third
embodiment of the present invention.
[0020] FIG. 13 is an enlarged sectional view showing a portion near
a discharge portion in a pump apparatus according to a fourth
embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0021] Pump apparatuses according to embodiments of the present
invention will be explained hereinafter with reference to the
accompanying drawings.
First Embodiment
[Structure of Brake Hydraulic Pressure Circuit]
[0022] FIG. 1 is a hydraulic pressure circuit diagram showing a
brake hydraulic pressure control apparatus 32. The hydraulic
pressure circuit is formed within a hydraulic pressure control unit
30 provided between a master cylinder M/C and wheel cylinders W/C.
FIG. 2 and FIG. 3 are skeleton diagrams of a housing 31 of a
hydraulic pressure control unit 30. FIG. 2 and FIG. 3 show a state
in which valves, the control unit, and a motor M are detached for
facilitating the understanding.
[0023] This brake hydraulic pressure control apparatus 32 performs
a hydraulic pressure control in accordance with a desired hydraulic
pressure for a Vehicle Dynamics Control (hereinafter, referred to
as a VDC), and an Anti-lock Brake System (hereinafter, referred to
as ABS) from a controller. Brake hydraulic pressure control
apparatus 32 has an x-piping system having two systems including a
brake hydraulic pressure circuit 21P of a P system and a brake
hydraulic pressure circuit 21S of an S system. The P system is
connected with a wheel cylinder W/C(FL) of a left front wheel, and
a wheel cylinder W/C(RR) of a right rear wheel. The S system is
connected with a wheel cylinder W/C(FR) of a right front wheel, and
a wheel cylinder W/C(RL) of a left rear wheel. Brake hydraulic
pressure control apparatus 32 and wheel cylinders W/C are connected
with wheel cylinder ports 19 (19RL, 19FR, 19FL, and 19RR) formed on
an upper surface 31c of housing 31 described later. Moreover, a
pump unit P is a tandem gear pump including a gear pump PP in the P
system, and a gear pump PS in the S system.
[0024] Master cylinder M/C and hydraulic pressure control unit 30
are connected with each other by fluid passages 18P and 18S through
master cylinder ports 20P and 20S formed on a port connection
surface 31a1 of housing 31 described later. These fluid passages 18
(18P and 18S) and a suction side of pump unit P are connected by
fluid passages 10P and 10S. Moreover, there is provided a master
cylinder pressure sensor 22 provided on fluid passage 18P between
master cylinder port 20P, and a connection portion between fluid
passage 18P and fluid passage 10P.
[0025] A discharge side of pump unit P and wheel cylinders W/C are
connected, respectively, by fluid passages 11P and 11S. There are
provided pressure increasing valves 3FL, 3RR, 3FR, and 3RL which
are normally-open solenoid valves corresponding to wheel cylinders
W/C, and which are provided on fluid passages 11 (11P and 11S).
Moreover, there are check valves 6 (6P and 6S) which are provided
on fluid passages 11 (11P and 11S) between pressure increasing
valves 3 (3FL and 3RR, and 3FR and 3RL) and pump unit P. Each of
check valves 6 is arranged to allow a flow of a brake hydraulic
pressure in a direction from pump unit P toward the corresponding
pressure increasing valve 3, and to prohibit a flow of the brake
hydraulic pressure in an opposite direction from the corresponding
pressure increasing valve 3 to pump unit P. Moreover, there are
provided discharge pressure sensors 23P and 23S disposed on fluid
passages 11 (11P and 11S) between pressure increasing valves 3 (3FL
and 3RR, and 3FR and 3RL) and pump unit P.
[0026] Moreover, there are provided fluid passages 16FL, 16RR,
16FR, and 16RL which are disposed on fluid passages 11 (11P and
11S), and which bypass the corresponding pressure increasing valves
3, respectively. There are provided check valves 9FL, 9RR, 9FR, and
9RL which are disposed, respectively, on fluid passages 16 (16FL,
16RR, 16FR, and 16RL). Each of check valves 9 (9FL, 9RR, 9FR, and
9RL) is arranged to allow a flow of the brake hydraulic pressure in
a direction from the corresponding wheel cylinder W/C to pump unit
P, and to prohibit a flow of the brake hydraulic pressure in an
opposite direction from pump unit P to the corresponding wheel
cylinder W/C.
[0027] Master cylinder M/C and fluid passages 11 (11P and 11S) are
connected by fluid passages 12P and 12S. Fluid passages 11 and
fluid passages 12 are joined between pump unit P and the
corresponding pressure increasing valves 3. There are provided gate
out valves 2P and 2S which are normally open solenoid valves, and
which are disposed on fluid passages 12. Moreover, there are
provided fluid passages 17P and 17S which are disposed on fluid
passages 12, and which bypass the respective gate out valves 2 (2P
and 2S). Furthermore, there are provided check valves 8P and 8S
which are disposed on fluid passages 17 (17P and 17S). Each of
check valves 8P and 8S is arranged to allow a flow of the brake
hydraulic pressure in a direction from the master cylinder M/C's
side toward the corresponding wheel cylinders W/C, and to prohibit
a flow of the brake hydraulic pressure in an opposite direction
from the corresponding wheel cylinders W/C toward the master
cylinder M/C's side.
[0028] Furthermore, there are provided reservoir 15P and 15S which
are disposed on the suction side of pump unit P. These reservoirs
15P and 15S and pump unit P are connected by fluid passages 14P and
14S. There are provided check valves 7P and 7S which are disposed
between reservoirs 15 (15P and 15S) and pump unit P. Wheel
cylinders W/C and fluid passages 14 (14P and 14S) are connected by
fluid passages 13P and 13S. Fluid passages 13 (13P and 13S) and
fluid passages 14 are joined between check valves 7 (7P and 7S),
and reservoirs 15 (15P and 15S). There are provided pressure
decreasing valves 4FL, 4RR, 4FR, and 4RL which are disposed on
fluid passages 13 (13P and 13S), and which are normally-closed
solenoid valves.
[0029] [Structure of Housing]
[0030] In below illustrations, a surface on which master cylinder
ports 20 are opened is a front surface 31a, and a back surface of
front surface 31a is a rear surface 31b. A surface on which wheel
cylinder ports 19 are opened is an upper surface 31c. A back
surface of upper surface 31c is a lower surface 31d. A side surface
on a left side of front surface 31a is a left side surface 31e. A
side surface on a right side of front surface 31a is a right side
surface 31f. FIG. 2A is a view when housing 31 is viewed from front
surface 31a's side. FIG. 2B is a view when housing 31 is viewed
from the upper surface 31c's side. FIG. 2C is a view when housing
31 is viewed from the rear surface 31d's side. FIG. 3A is a view
when housing 31 is viewed from the rear surface 31b's side. FIG. 3B
is a view when housing 31 is viewed from the right side surface
31f's side. FIG. 3C is a view when housing 31 is viewed from the
left side surface 31e's side.
[0031] Moreover, FIG. 4, FIG. 5, and FIG. 6 are perspective views
showing housing 31. FIG. 4 is a view when housing 31 is viewed from
the rear surface 31b's side, the upper surface 31c's side, and the
left side surface 31e's side. FIG. 5 is a view when housing 31 is
viewed from the front surface 31a's side, the upper surface 31c's
side, and the left side surface 31e's side. FIG. 6 is a view when a
unit case 34 and motor M are attached.
[0032] Housing 31 has a substantially rectangular parallelepiped
(rectangular solid) shape. Motor M is mounted on the front surface
31a's side. The solenoid valves of gate out valves 2, pressure
increasing valves 3, and pressure decreasing valves 4, and an
electric unit arranged to drive the solenoid valves are mounted on
the rear surface 31b's side. The electric unit includes a circuit
board arranged to perform a predetermined calculation in accordance
with input signals of wheel speed sensors and so on which are
attached to the vehicle. The electric unit is arranged to output a
predetermined electric signal to solenoids attached to the solenoid
valves, and motor M. This electric unit is received within unit
case 34. Housing 31 includes power supply holes which penetrate
through front surface 31a and rear surface 31b. Electrodes of motor
M are inserted into these power supply holes 24, so that the
electric unit and motor M are connected.
[0033] Housing 31 includes a valve mounting holes in which the
solenoid valves are mounted by press fit or staking; a plurality of
fluid passages which connect the ports and the solenoid valves; and
holes in which ports (wheel cylinder ports 19 and master cylinder
ports 20) connected with the cylinders (wheel cylinders W/C and
master cylinders M/C), and reservoirs 15 are disposed. These holes,
fluid passages, and so on are formed by drilling the respective
surfaces from the outside of housing 31.
[0034] Housing 31 includes a port connection surface 31a1 which is
formed on front surface 31a on the upper surface 31c's side, which
has a surface normal on the motor M's side, and which is
substantially parallel with front surface 31a. Port connection
surface 31a1 is formed to protrude in a forward direction (the
motor side in the axial direction of the motor drive shaft) from
front surface 31a. Master cylinder ports 20 are formed on this port
connection surface 31a1.
[0035] Pump unit P is received within a substantially cylindrical
receiving portion 41 which penetrates through housing 31 from front
surface 31a to rear surface 31b. This receiving portion 41 includes
an opening portion which is on the rear surface 31b's side, and
which is closed by a pump cover 35. Moreover, housing 31 includes a
discharge portion receiving hole 47 (47P and 47S) which extends
from left side surface 31e of housing 31 to right side surface 31f
of housing 31, and which is substantially perpendicular to
receiving portion 41. Discharge portions 48 (48P and 48S) are
received within this discharge portion receiving hole 47. Discharge
portions 48 are connected with the discharge side of pump P.
[0036] [Structure of Pump Unit]
[0037] FIG. 7 is a perspective view showing pump unit P and
discharge portions 48. Moreover, FIG. 8 is a partially sectional
view showing a state where pump unit P and discharge portions 48
are received within housing 31. FIG. 9 is a sectional view taken
along a section line A-A of FIG. 8.
[0038] Pump unit P includes a pump housing 36, a center plate 49,
and a pump cover 35. Pump housing 36, center plate 49, and pump
cover 35 have, respectively, substantially cylindrical outer
profiles. Pump housing 36, center plate 49, and pump cover 35 are
arranged in this order in the axial direction. Pump housing 36
includes a bottomed hollow section. Gear pump PP is received in a
space between this hollow section of pump housing 36 and center
plate 49. Moreover, pump cover 35 includes a bottomed hollow
section. Gear pump PS is received in a space between this hollow
section of pump cover 35 and center plate 49.
[0039] Pump housing 36 includes an O-ring groove 55a and an O-ring
groove 55b formed on an outer circumference of pump housing 36.
Pump cover 35 includes an O-ring groove 55c formed on an outer
circumference of pump cover 35. O-ring grooves 55a, 55b, and 55c
are formed to be apart from each other in the axial direction.
O-rings 45a, 45b, and 45c are mounted, respectively, in O-ring
grooves 55a, 55b, and 55c.
[0040] Pump housing 36 includes a circumferential side surface 56P
formed between O-ring 45a and O-ring 45b. Moreover, there is formed
a low pressure chamber groove 57P which is formed on an inner
circumference of receiving portion 41 at a position to confront
circumferential side surface 56P when pump unit P is received
within receiving portion 41 of housing 31. There is formed a low
pressure chamber 40P defined by circumferential side surface 56P of
pump housing 36, low pressure chamber groove 57P of receiving
portion 41, O-ring 45a, and O-ring 45b.
[0041] Center plate 49 includes a low pressure chamber groove 56S
formed on an outer circumference of center plate 49 in a
circumferential direction. Moreover, housing 31 includes a low
pressure chamber groove 57S which is formed on an inner
circumference of receiving portion 41 at a position to confront low
pressure chamber groove 56S when pump unit P is received within
receiving portion 41 of housing 31.
[0042] Gear pumps PP and PS include, respectively, first gear
plates 38P and 38S, second gear plates 39P and 39S, and a pair of
driving and driven gears 46P and 46S which are externally engaged
with each other. There are formed suction portions 58P and 58S
between first gear plates 38P and 38S, and second gear plates 39P
and 39S. An O-ring 37P is provided on an outer circumference of
gear pump PP on the opening portion side of suction portion 58P of
gear pump PP, that is, on an outer circumference of gear pump PP on
a side on which gear pump PP and pump housing 36 are abutted on
each other. Moreover, an O-ring 37S is provided on an outer
circumference of gear pump PS on the opening portion side of
suction portion 58S of gear pump PS, that is, on an outer
circumference of gear pump PS on a side on which gear pump PS and
center plate 49 are abutted on each other.
[0043] A shaft 63 is connected to a drive side of gear 46P and a
drive side of gear 46S. This shaft 63 penetrates through first gear
plates 38P and 38S, second gear plates 39P and 39S, center plate
49, and pump housing 36. This shaft 63 is connected to a rotational
shaft of motor M.
[0044] There is formed a high pressure chamber 480P defined by pump
housing 36, center plate 49, first gear plate 38P, and second gear
plate 39P. Moreover, there is formed a high pressure chamber 480S
defined by pump cover 35, center plate 49, first gear plate 38S,
and second gear plate 39S.
[0045] Pump housing 36 includes a suction passage 42P connecting
suction portion 58P of gear pump PP and low pressure chamber 40P.
Moreover, center plate 49 includes a suction passage 42S connecting
suction portion 58S of gear pump PS and low pressure chamber
40S.
[0046] Discharge portions 48P and 48S are received, respectively,
within discharge portion receiving holes 47P and 47S formed to
extend from left side surface 31e of housing 31 to right side
surface 31f of housing 31 to be substantially perpendicular to
receiving portion 41, as described above. That is, these discharge
portions 48P and 48S are received within discharge portion
receiving holes 47P and 47S formed in symmetry with respect to a
line in a radial direction of low pressure chambers 40P and
40S.
[0047] Discharge passages 43P and 43S are formed by discharge
passage members 481P and 481S each having an axial through hole.
One end portions of discharge passage members 481P and 481S are
inserted, respectively, together with O-rings 483P and 483S into
insertion holes 64P and 64S formed in side surfaces of center plate
49. In this case, discharge passage members 481P and 481S penetrate
through low pressure chamber 40S. Center plate 49 includes
connection passages 49P and 49S which connect opening portions of
one ends of discharge passage members 481P and 481S, and high
pressure chambers 480P and 480S, respectively.
[0048] FIG. 10 is an enlarged sectional view showing a portion near
the discharge portion in the pump apparatus according to the first
embodiment of the present invention. In FIG. 10, an axis X1 is
defined by a direction in which discharge portion 48 extends.
Discharge portion 48P has a structure substantially identical to
that of discharge portion 48S. Accordingly, the only discharge
portion 48S is illustrated below. Discharge portion 48S includes
discharge passage member 481S inserted into center plate 49; a
closing member 482S serving as a cover closing discharge portion
receiving hole 47S; and a wave washer 70 elastically sandwiched
between discharge passage member 481S and closing member 482S.
[0049] Discharge passage member 481S includes a tip end portion
481a which is formed into a tapered shape, and which is inserted
into insertion hole 64S of center plate 49, and a body portion 481h
which is formed into a cylindrical shape, and which has a diameter
larger than that of tapered portion 481a.
[0050] Tip end portion 481a of discharge passage member 481S
includes a seal groove 481b formed on an outer circumference of tip
end portion 481a. An O-ring 483S is mounted in this seal groove
481b. When tip end portion 481a is inserted within insertion hole
64S, O-ring 483S liquid-tightly separates connection passage 49S
and low pressure chamber 40S within insertion hole 64S. Tip end
portion 481a includes a tip end side discharge passage 481c which
is formed at a shaft center of tip end portion 481a, and which
penetrates through tip end portion 481a.
[0051] Body portion 481h is a member which is inserted into a
discharge passage member receiving hole 47c of discharge portion
receiving hole 47S that receives discharge passage member 481S.
Body portion 481h includes a seal groove 481e formed on an outer
circumference of body portion 481h. An O-ring 484S is mounted in
this seal groove 481e. Body portion 481h includes a body side
discharge passage 481f which is formed at a shaft center of body
portion 481h in the axial direction, and which is connected with
tip end side discharge passage 481c. Discharge passage member 481S
includes a stepped portion 481d provided at a connection portion
between tip end portion 481a and body portion 481h. This stepped
portion 481d is engaged with low pressure chamber groove 56S of
center plate 49 so as to position discharge passage member 481S in
a direction of axis X1. Accordingly, low pressure chamber groove
56S serves as an engagement portion which is engaged with stepped
portion 481d.
[0052] As shown in a partially enlarged view of body portion 481h,
there is formed a radial gap provided radially between the outer
circumference of body portion 481h and discharge passage member
receiving hole 47c. This gap is arranged to ensure sufficient
liquid-tightness by the elastic deformation of O-ring 484S, and to
absorb the deviation even when a radial position relationship
between discharge passage member 481S and discharge passage member
receiving hole 47c is misaligned (deviated) due to the
manufacturing error, assembly error, and so on. That is, in
discharge passage member 481S, tip end portion 481a is inserted
into center plate 49, and body portion 481h is inserted into
discharge passage member receiving hole 47c formed in housing 31.
In this case, the position relationship between center plate 49 and
housing 31 in the direction of the motor rotational shaft is not
stable due to the assembly error and so on. For improving the
assembling accuracy so as to dissolve the above-described matter,
it is necessary to improve the accuracy of the entire components.
Accordingly, the cost may be increased. On the other hand, in the
pump apparatus according to this embodiment, there is provided the
radial gap. With this, it is possible to absorb the deviation in
the radial direction. Therefore, since the high accuracy of the
components is not needed, it is possible to ensure the facility
(ease) of the assembling operation while avoiding the cost
increase. Besides, O-ring 484S liquid-tightly separates low
pressure chamber 40S and body portion side discharge passage
481f.
[0053] Body portion side discharge passage 481f is opened on a body
portion side end surface 481g of discharge passage member 481S. A
position of this body portion side end surface 481g in the
direction of axis X1 is designed to be positioned at a position on
the outer side of the housing outer side end portion of discharge
passage member receiving hole 47c. Wave washer 70 is provided on
this body portion side end surface 481g. Closing member 482S is
assembled through wave washer 70.
[0054] Closing member 482S includes a cover portion 482a received
within a cover portion receiving hole 47a of discharge portion
receiving hole 47S, and a cylindrical portion 482b received within
a cylindrical portion receiving hole 47b of discharge portion
receiving hole 47S. Cylindrical portion receiving hole 47b has a
diameter larger than that of discharge passage member receiving
hole 47c. A radial portion of cylindrical portion receiving hole
47b of closing member receiving hole 47S is connected to the
discharge hydraulic passage. Moreover, cover member receiving hole
47a has a diameter larger than that of cylindrical portion
receiving hole 47b. Discharge portion receiving hole 47S is
liquid-tightly closed by the staking and so on after closing member
482S is inserted. Cylindrical portion 482b includes a damper
chamber 482c which is formed at a shaft center of cylindrical
portion 482b, which has a diameter larger than that of body portion
side discharge passage 481f, and which has an axial length longer
than that of body portion side discharge passage 481f. Moreover,
cylindrical portion 482b includes a radial hydraulic passage 482d
which is formed radially outside this damper chamber 482c.
Cylindrical portion 482b includes a discharge groove 482h formed on
an outer circumference of cylindrical portion 482b at an axial
position at which discharge groove 482h is overlapped with radial
hydraulic passage 482d; and a ring groove 482e and a ring groove
482f formed on both sides of this discharge groove 482h in the
axial direction. Ring groove 482f receives an O-ring 485S. Ring
groove 482e receives an O-ring 486S. Moreover, wave washer 70 is
abutted on a io pump side end surface 482g of cylindrical portion
482b.
[0055] Next, an assembling process, and functions of the members
are illustrated. When hydraulic pressure control unit 30 is
assembled, pump unit P is assembled to housing 31. With this, the
position of center plate 49 with respect to housing 31 is
determined. Then, discharge passage member 481S is inserted from
discharge portion receiving hole 47S formed in the side surface of
housing 31. The tip end of discharge passage member 481S is
inserted within insertion hole 64S of center plate 49. In this
case, even when the position relationship between discharge passage
member receiving hole 47c and center plate 49 is deviated
(misaligned) in a measure, it is possible to insert discharge
passage member 481S since there is the radial gap between discharge
passage member 481S and discharge passage member receiving hole
47c. The position of discharge passage member 481S in the direction
of the axis X1 is determined by the engagement between low pressure
chamber groove 56S of center plate 49, and stepped portion 481d of
discharge passage member 481S.
[0056] Next, wave washer 70 is inserted. Moreover, closing member
482S is inserted into discharge portion receiving hole 47S. In this
case, pump side end surface 482g of closing member 482S presses
discharge passage member 481S through wave washer 70 in the
direction of the axis X1 (in the rightward direction of FIG. 10).
Besides, body portion side end surface 481g of discharge passage
member 481S is exposed within cylindrical portion receiving hole
47b having the large diameter. Accordingly, it is possible to
constantly act the elastic pressing force by wave washer 70. On the
other hand, closing member 482S is positioned by the staking and so
on of cover portion 482a. Accordingly, there are problems such as
the manufacturing accuracy of cover portion receiving hole 47a and
closing member 482S, and the assembly error in the direction of the
axis X1. In this case, it is possible to absorb the error in the
direction of the axis X1 by providing the elastic force by wave
washer 70.
[0057] That is, discharge passage member 481S and closing member
482S are different members. Discharge passage member 481S absorbs
the radial error. On the other hand, wave washer 70 absorbs the
error in the direction of the axis X1. With this, it is possible to
ensure the stable assembling accuracy.
[0058] (1) The pump apparatus according to the first embodiment of
the present invention includes a housing 31, a pump unit P received
within a receiving portion 41 which is formed in housing 31, and
which constitutes low pressure chamber 40S; suction passages 58S
and 58P opened in an outer circumference of pump unit P, and
arranged to supply a hydraulic fluid to pump unit P; a discharge
passage member 481S including a tip end side discharge passage 481c
and a body portion side discharge passage 481f (discharge passage)
formed within discharge passage member 481S so as to discharge the
hydraulic fluid pressurized by pump unit P to the outside of pump
housing 31; insertion hole 64S (first discharge passage insertion
hole) which is formed in pump unit P, and in which discharge
passage member 481S is inserted through O-ring 483S (elastic
member); discharge passage member receiving hole 47c (second
discharge passage insertion hole) which is formed in housing 31,
and in which discharge passage member 481S is inserted through
O-ring 484S (elastic member); and a wave washer 70 (axial position
adjusting mechanism) arranged to position discharge passage member
481S within discharge passage member receiving hole 47c in the
axial direction.
[0059] Accordingly, it is possible to absorb the assembly error of
discharge passage member 481S and so on, and thereby to ensure the
facility (ease) of the assembling operation without needs for the
extreme increase of the manufacturing accuracy of the
components.
[0060] (2) In the pump apparatus according to the embodiments of
the present invention, wave washer 70 is an elastic member which is
arranged to apply the elastic force to discharge passage member
481S.
[0061] Accordingly, it is possible to absorb the error in the wide
range by elastically absorbing the manufacturing error of the
components, the assembly error, and so on, and to ensure the stable
assembling characteristic.
(3) In the pump apparatus according to the embodiments of the
present invention, the pump apparatus further includes a
predetermined radial gap between discharge passage member 481S and
each of insertion hole 64S and discharge passage member receiving
hole 47c (each of the insertion holes), and a radial position
adjusting mechanism arranged to adjust the position relationship
between the insertion holes and the discharge passage member
481S.
[0062] Accordingly, it is also possible to elastically adjust the
assembly error in the radial direction, and so on, and to ensure
the stable assembling characteristic.
(4) In the pump apparatus according to the embodiments of the
present invention, the pump apparatus further includes closing
member 482S which is fixed to housing 31, and which closes
discharge passage member receiving hole 47c (second discharge
passage insertion hole); and wave washer 70 (the axial position
adjusting mechanism) is provided between discharge passage member
481S and closing member 482S.
[0063] Accordingly, it is possible to ensure the stable assembling
operation by the elastic force even when there is the variation of
the axial lengths of the closing member 482S and discharge passage
member 481S.
(5) In the pump apparatus according to the embodiments of the
present invention, the axial position adjusting mechanism is wave
washer 70 (plate spring) disposed in a contracted state between
discharge passage member 481S and closing member 482S. Accordingly,
it is possible to apply the large elastic force even when there is
only slight gap relative to the gap necessary for the elastic
member such as the coil spring and so on. (6) In the pump apparatus
according to the embodiments of the present invention, the pump
apparatus further includes a low pressure chamber groove 56S
(engagement portion) which is formed in insertion hole 64S, and
which is arranged to be engaged with discharge passage member 481S.
The axial position adjusting mechanism is an elastic member
arranged to urge discharge passage member 481S toward low pressure
chamber groove 56S. Accordingly, it is possible to engage low
pressure chamber groove 56S and stepped portion 481d, and to
further improve the seal characteristic between connection passage
49S having the high pressure and low pressure chamber 40S.
Second Embodiment
[0064] Next, a pump apparatus according to a second embodiment of
the present invention is illustrated below. The pump apparatus
according to the second embodiment of the present invention has a
basic structure substantially identical to the pump apparatus
according to the first embodiment of the present invention.
Accordingly, only different portions are illustrated. FIG. 11 is an
enlarged sectional view showing a portion near the discharge
portion in the pump apparatus according to the second embodiment of
the present invention. In the pump apparatus according to the first
embodiment, wave washer 70 which is the elastic member is provided
between discharge passage member 481S and closing member 482S. On
the other hand, in the pump apparatus according to the second
embodiment wave washer 70 is provided between discharge passage
member 481S and insertion hole 64S, unlike the pump apparatus
according to the first embodiment. Besides, in the pump apparatus
according to the first embodiment, the positioning is performed by
the engagement between stepped portion 481d of discharge passage
member 481S and low pressure chamber groove 56S. On the other hand,
in the pump apparatus according to the second embodiment, stepped
portion 481d and low pressure chamber groove 56S are elastically
held with a gap, by the change of the position of wave washer 70.
The basic effects and functions in the pump apparatus according to
the second embodiment are substantially identical to those in the
pump apparatus according to the first embodiment. Accordingly, the
repetitive illustrations are omitted.
Third Embodiment
[0065] Next, a pump apparatus according to a third embodiment of
the present invention is illustrated. The pump apparatus according
to the third embodiment has a basic structure substantially
identical to that of the pump apparatus according to the first
embodiment. Accordingly, only different portions are illustrated.
FIG. 12 is an enlarged sectional view showing a portion near the
discharge portion in the pump apparatus according to the third
embodiment. In the pump apparatus according to the first
embodiment, pump side end surface 482g of closing member 482S
applies the elastic force to the discharge passage member 481S
through wave washer 70. On the other hand, in the pump apparatus
according to the third embodiment, a coil spring 71 is provided in
place of wave washer 70. Moreover, closing member 482S has an axial
length shorter than that of closing member 482S in the pump
apparatus according to the first embodiment. With this, it is
possible to form a large damper chamber by increasing a space
formed by the wall surface of cylindrical receiving hole 47b, pump
side end surface 482g, and body portion side end surface 481g. With
this, it is possible to ensure the damping characteristic of the
discharge passage. Besides, the radial position adjusting function,
and the position adjusting function in the direction of the axis X1
are identical to those of the pump apparatus according to the first
embodiment. Accordingly, the repetitive illustrations are
omitted.
(7) In the pump apparatus according to the embodiments of the
present invention, the pump apparatus further includes a damper
chamber formed by closing member 482S, discharge passage member
481S, and cylindrical portion receiving hole 47b (second passage
member insertion hole). Accordingly, it is possible to effectively
suppress the pulsation of the discharge pressure. Moreover, it is
possible to ensure the volume necessary for the damping by using
coil spring 71, and thereby to improve the damping characteristic.
(8) In the pump apparatus according to the embodiments of the
present invention, the axial position adjusting mechanism is coil
spring 71 disposed in a contracted state between discharge passage
member 481S and closing member 482S. Accordingly, it is possible to
ensure the larger elastic deformation region with respect to axis
X1, relative to the wave washer and so on. Consequently, it is
possible to effectively absorb the assembly error and so on.
Moreover, it is possible to obtain the damping space, and thereby
to ensure the damping characteristic.
Fourth Embodiment
[0066] Next, a pump apparatus according to a fourth embodiment of
the present invention is illustrated. The pump apparatus according
to the fourth embodiment has a basic structure substantially
identical to the pump apparatus according to the first embodiment.
Accordingly, only different portions are illustrated. FIG. 13 is an
enlarged sectional view showing portions near the discharge portion
of the pump apparatus according to the fourth embodiment of the
present invention. In the pump apparatus according to the first
embodiment, pump side end surface 482g of closing member 482S
applies the elastic force to discharge passage member 481S through
wave washer 70. On the other hand, the pump apparatus according to
the fourth embodiment includes a plunger member 72, in place of
wave washer 70. An inner wall of damper chamber 482c and plunger 72
are fixed by the press fit.
[0067] Plunger member 72 is a bottomed cylindrical member. Plunger
member 72 includes a cylindrical portion 72b which is formed into a
hollow cylindrical shape; a bottom portion 72a which closes an
opening of body portion side discharge passage 481f of the
discharge passage member 481S; an axial orifice 72c formed in
bottom portion 72a, and opened to body portion side discharge
passage 481f; and radial orifices 72d formed in cylindrical portion
72b, and opened to the discharge passage within housing 31.
[0068] At the assembly operation, first, discharge passage member
481S is inserted within discharge portion receiving hole 47S. Next,
plunger member 72 is slightly mounted in the inner wall of damper
chamber 482c of closing member 482S. In this temporary assembly
state, this is inserted into discharge portion receiving hole 47S.
Then, when cover portion 482a of closing member 482S is pressed
into discharge portion receiving hole 47S by being applied with the
load, the relative position between plunger member 72 and closing
member 482S is varied. The press fit is continued until cover
portion 482a of closing member 4825 is fully received within cover
portion receiving hole 47a. With this, the urging force toward the
pump unit side is applied to discharge passage member 481S.
(9) In the pump apparatus according to the embodiments of the
present invention, the axial position adjusting mechanism includes
plunger member 72 which is arranged to be moved relative to closing
member 482S (or discharge passage member 481S) in the axial
direction. The axial position adjusting mechanism is arranged to
adjust the relative position between plunger member 72 and closing
member 482S (or discharge passage member 481S). With this, it is
possible to absorb the assembly error in the axial direction, and
to ensure the facility (ease) of the assembling operation without
needs for the extreme increase of the manufacturing accuracy of the
components. Besides, in the pump apparatus according to the fourth
embodiment of the present invention, the axial position is adjusted
by the relative displacement between closing member 482S and
plunger member 72. However, discharge passage member 481S and
plunger member 72 may be relatively moved, and the press fit may be
performed by the pressing force of closing member 482S.
[0069] As described above, the pump apparatuses according to the
embodiments of the present invention are illustrated. However, the
present invention is not limited to the above-described
embodiments. The other structures may be employed within the gist
of the invention. For example, in the pump apparatus according to
the embodiments of the present invention, the O-ring is used as the
elastic member. However, the elastic member is not limited to the
O-ring. It is optional to elastically absorb the deviation of the
radial position by other elastic members. Moreover, in the pump
apparatus according to the embodiments of the present invention,
the elastic member and the press fit which serve as the axial
position adjusting mechanism absorb the assembly error and so on.
However, it is optional to employ a structure in which the axial
position is adjusted by screw and so on.
[1] A pump apparatus according to the embodiments of the present
invention including: a housing; a pump unit received within a
receiving portion which is formed in the housing, and which
constitutes a low pressure chamber; a suction passage which is
opened in an outer circumference of the pump unit, and which is
arranged to supply a hydraulic fluid into the pump unit; a
discharge passage member including a discharge hydraulic passage
which is formed therein, and which is arranged to discharge the
hydraulic fluid pressurized by the pump unit to an outside of the
housing; a first discharge passage insertion hole which is formed
in the pump unit, and into which the discharge passage member is
inserted through an elastic member; a second discharge passage
insertion hole which is formed in the housing, and into which the
discharge passage member is inserted through an elastic member; and
an axial position adjusting mechanism arranged to adjust an axial
position of the discharge passage member within the first discharge
passage insertion hole and the second discharge passage insertion
hole.
[0070] With this, it is possible to absorb the assembly errors of
the discharge passage member and so on, and to ensure the facility
(ease) of the assembly operation without needs for the extreme
increase of the manufacturing accuracy of the components.
[2] In the pump apparatuses according to the embodiments of the
present invention, the axial position adjusting mechanism is an
elastic member arranged to apply an elastic force to the discharge
passage member.
[0071] Accordingly, it is possible to absorb the error in the wide
range by elastically absorbing the manufacturing error of the
components, the assembly error of the components and so on, and to
ensure the stable assembly characteristic.
[3] In the pump apparatus according to the embodiments of the
present invention, the first discharge passage insertion hole and
the discharge passage member are disposed with a gap therebetween;
the second discharge passage insertion hole and the discharge
passage member are disposed with a gap therebetween; and the pump
apparatus further includes a radial position adjusting mechanism
arranged to adjust a position relationship between each of the
first discharge passage insertion hole and the second discharge
passage insertion hole, and the discharge passage member.
[0072] Accordingly, it is possible to elastically adjust the
assembly error and so on in the radial direction, and to ensure the
stable assembly characteristic.
[4] In the pump apparatus according to the embodiments of the
present invention, the pump apparatus further includes a closing
member which is fixed to the housing, and which closes the second
discharge passage insertion hole; and the axial position adjusting
mechanism is disposed between the discharge passage member and the
closing member.
[0073] Accordingly, it is possible to ensure the stable assembly
characteristic by the elastic force even when there are the
variations of the axial lengths of the closing member and the
discharge passage member.
[5] In the pump apparatus according to the embodiments of the
present invention, the pump apparatus further includes a damper
chamber formed by the closing member, the discharge passage member,
and a wall surface of the second passage member insertion hole.
[0074] Accordingly, it is possible to effectively suppress the
pulsation of the discharge pressure.
[0075] [6] In the pump apparatus according to the embodiments of
the present invention, the axial position adjusting mechanism
includes a plunger member arranged to be moved in an axial
direction relative to one of the discharge passage member and the
closing member; and the axial position adjusting mechanism is
arranged to adjust a relative position between the plunger member,
and the one of the discharge passage member and the closing
member.
[0076] Accordingly, it is possible to absorb the assembly error in
the axial direction, and so on, and to ensure the facility (ease)
of the assembly operation without needs for the extreme increase of
the manufacturing accuracy of the components.
[7] In the pump apparatus according to the embodiments of the
present invention, the axial position adjusting mechanism is a
plate spring disposed in a contracted state between the discharge
passage member and the closing member.
[0077] Accordingly, it is possible to apply large elastic force by
a short travel, and to decrease the size of the apparatus.
[8] In the pump apparatus according to the embodiments of the
present invention, the axial position adjusting mechanism is a coil
spring disposed in a contracted state between the discharge passage
member and the closing member.
[0078] Accordingly, it is possible to ensure the space which has a
damping function of the discharge pressure, and to improve the
damping characteristic.
[9] In the pump apparatus according to the embodiments of the
present invention, the pump apparatus further includes an
engagement portion which is formed in the first discharge passage
insertion hole, and with which the discharge passage member is
engaged; and the axial position adjusting mechanism is an elastic
member arranged to urge the discharge passage member toward the
engagement portion.
[0079] Accordingly, it is possible to position the discharge
passage member with respect to the pump unit, and to ensure the
facility of the assembly operation.
[0080] (10) The pump apparatus according to the embodiments of the
present invention including: a housing; a pump unit received within
a receiving portion which is formed in the housing, and which
constitutes a low pressure chamber; a discharge passage which is
arranged to discharge a hydraulic fluid pressurized by the pump
unit, through the housing to an outside of the housing; a discharge
passage member which constitutes the discharge passage, and which
includes a discharge hydraulic passage formed therein; a first
discharge passage insertion hole which is formed in the pump unit,
and into which an one end portion of the discharge passage member
is inserted through an elastic member; a second discharge passage
insertion hole which is formed in the housing, and into which the
other end portion of the discharge passage member is inserted
through an elastic member; an axial position adjusting mechanism
arranged to adjust an axial position of the discharge passage
member with respect to the first discharge passage insertion hole
and the second discharge passage insertion hole; and the first
discharge passage insertion hole and the discharge passage member
being disposed with a predetermined radial gap therebetween, the
second discharge passage insertion hole and the discharge passage
member being disposed with a predetermined radial gap therebetween,
a radial position adjusting mechanism arranged to adjust a radial
position relationship between the each of the first discharge
passage insertion hole and the second discharge passage insertion
hole, and the discharge passage member.
[0081] Accordingly, it is possible to absorb the assembly error and
so on of the discharge passage member in the axial direction and in
the radial direction, and to ensure the facility (ease) of the
assembly operation without needs for the extreme increase of the
manufacturing accuracy of the components.
(11) In the pump apparatus according to the embodiments of the
present invention, the axial position adjusting mechanism is an
elastic member arranged to apply an elastic force to the discharge
passage member.
[0082] Accordingly, it is possible to absorb the error in the wide
range since the axial position adjusting mechanism absorbs the
manufacturing errors of the components, and the assembly errors,
and so on, and thereby to ensure the stable assembling
characteristic.
(12) In the pump apparatus according to the embodiments of the
present invention, the radial position adjusting mechanism is an
O-ring mounted on an outer circumference of the discharge passage
member; and the radial position adjusting mechanism is arranged to
adjust a size of the radial gap by an elastic deformation of the
O-ring.
[0083] Accordingly, it is possible to absorb the error of the
radial position while ensuring the seal characteristic, by simple
structure.
(13) In the pump apparatus according to the embodiments of the
present invention, the pump apparatus further includes a closing
member which is fixed to the housing, and which closes the second
discharge passage insertion hole; and the axial position adjusting
mechanism is disposed between the discharge passage member and the
closing member.
[0084] Accordingly, it is possible to ensure the stable assembling
characteristic even when the axial length of the closing member and
the axial length of the discharge passage member are varied.
(14) In the pump apparatus according to the embodiments of the
present invention, the axial position adjusting mechanism is a
plate spring disposed in a contracted state between the discharge
passage member and the closing member.
[0085] Accordingly, it is possible to attain the large elastic
force by a short travel, and thereby to decrease the size of the
pump apparatus.
(15) In the pump apparatus according to the embodiments of the
present invention, the pump apparatus further includes a damper
chamber formed by the closing member, the discharge passage member,
and a wall surface of the second passage member insertion hole.
[0086] Accordingly, it is possible to effectively suppress the
pulsation of the discharge pressure.
[0087] (16) A pump apparatus according to the embodiments of the
present invention includes: a housing; a pump unit which is
received in a receiving portion formed in the housing, and which
includes a low pressure portion and a high pressure portion formed
therein; a suction passage formed in the housing, and arranged to
supply a hydraulic fluid to the low pressure portion of the pump
unit; a low pressure chamber connected with the suction passage and
the low pressure portion, and formed between the pump unit and a
wall portion forming the receiving portion when the pump unit is
received in the receiving portion; a discharge passage arranged to
discharge the hydraulic fluid pressurized by the pump unit; a
connection pipe which constitutes the discharge passage, and which
passes through the low pressure chamber, and which connects the
housing and the high pressure chamber, a first connection pipe
insertion hole which is formed in the pump unit, and into which the
connection pipe is inserted through an elastic member; a second
connection pipe insertion hole which is formed in the housing, and
into which the connection pipe is inserted through the elastic
member; an axial position adjusting mechanism arranged to adjust an
axial position of the connection pipe with respect to the first
connection pipe insertion hole and the second connection pipe
insertion hole; and the first connection pipe insertion hole and
the connection pipe being disposed with a predetermined radial gap
therebetween, the second connection pipe insertion hole and the
connection pipe being disposed with a predetermined radial gap
therebetween, a radial position adjusting mechanism arranged to
adjust a radial position relationship between each of the first
connection pipe insertion hole and the second connection pipe
insertion hole, and the connection pipe.
(17) In the pump apparatus according to the embodiments of the
present invention, the axial position adjusting mechanism is an
elastic member arranged to apply an elastic force to the connection
pipe.
[0088] Accordingly, it is possible to absorb the error in the wide
range since the manufacturing error of the components, the assembly
error, and so on are elastically absorbed, and thereby to ensure
the stable assembling characteristic.
(18) In the pump apparatus according to the embodiments of the
present invention, the radial position adjusting mechanism is an
O-ring which is mounted on an outer circumference of the discharge
passage member; and the radial position adjusting mechanism is
arranged to adjust a size of the radial gap by an elastic
deformation of the O-ring.
[0089] Accordingly, it is possible to absorb the error of the
radial position while ensuring the seal characteristic, by the
simple structure.
(19) In the pump apparatus according to the embodiments of the
present invention, the pump apparatus further includes a closing
member which is fixed to the housing, and which closes the second
connection pipe insertion hole; the axial position adjusting
mechanism is disposed between the connection pipe and the closing
member; and the pump apparatus further includes a damper chamber
formed by the closing member, the connection pipe, and a wall
surface of the second connection pipe insertion hole.
[0090] Accordingly, it is possible to ensure the space having the
damping function, and to improve the damping characteristic.
[0091] The entire contents of Japanese Patent Application No.
2012-154866 filed Jul. 10, 2012 are incorporated herein by
reference.
[0092] Although the invention has been described above by reference
to certain embodiments of the invention, the invention is not
limited to the embodiments described above. Modifications and
variations of the embodiments described above will occur to those
skilled in the art in light of the above teachings. The scope of
the invention is defined with reference to the following
claims.
* * * * *