CN103671092B

CN103671092B - Variable displacement vane pump

Info

Publication number: CN103671092B
Application number: CN201310380464.5A
Authority: CN
Inventors: 野中智史
Original assignee: Hitachi Automotive Systems Steering Ltd
Current assignee: Hitachi Astemo Ltd
Priority date: 2012-09-18
Filing date: 2013-08-28
Publication date: 2017-03-01
Anticipated expiration: 2033-08-28
Also published as: CN103671092A; JP2014058892A; JP5997556B2; KR20140036964A

Abstract

The present invention provides a kind of variable displacement vane pump, and this variable displacement vane pump is able to easily form the pressure being connected with pressure switch and imports path and pressure venting path.In the present invention, in variable displacement vane pump, the high pressure importing high pressure to control valve is imported road and is partly shared with the high pressure importing road leading to pressure switch.

Description

Variable displacement vane pump

Technical field

The present invention relates to a kind of variable displacement vane pump.

Background technology

In the past, in the technology that patent documentation 1 is recorded, there is in hydraulic circuit pressure switch, be changed in hydraulic circuit When more than the pressure of regulation, reduce for avoiding engine load to increase adjoint engine speed, make raising engine speed Device action, thus prevents engine stall.

Patent documentation 1：（Japan）Unexamined Patent 9-180607 publication

Here, in the technology that patent documentation 1 is recorded, making the pressure of the type of piston slip open by pressure in setting In the case of pass, the pressure of pressure for detecting high pressure is needed to import road and by the pressure of the clearance leakage from sliding part to low The return road that splenium is discharged.However, in the case of variable displacement vane pump, in terms of the construction making cam swings, relatively In core bag（カートリッジ）Direction of rotation, half is configured to suction side, and second half is configured to outlet side, accordingly, it is difficult to be formed For pressure is imported the oil path structure being connected with both pressure ventings.

Content of the invention

It is an object of the invention to provide a kind of variable displacement vane pump, this variable displacement vane pump can be easily Form the pressure being connected with pressure switch and import path and pressure venting path.

In order to reach above-mentioned purpose, in the present invention, the height of high pressure in variable displacement vane pump, is imported to control valve Pressure is imported road and is partly shared with the high pressure importing road leading to pressure switch.

Specifically, a kind of variable displacement vane pump of the present invention has：Pump case, it is by the first housing and second shell Body is constituted, and described first housing has cylindrical portion and closes the bottom of the axial side of described cylindrical portion, described second housing envelope Close the described axial opposite side of described cylindrical portion；Drive shaft, its e axle supporting is in described pump case；The stator of ring-type, it is with can The mode of movement is located in described cylindrical portion；Rotor, it is located in described stator, drives rotation by described drive shaft；Slit, its The circumference of described rotor is formed with multiple；Blade, it projects, submerging is located in described slit freely, with described stator And described rotor is separated into multiple pump chambers together；Platen, it is located between the described bottom in described cylindrical portion and described stator, Pushed to described stator side by the output pressure exporting from described pump chamber；First fluid pressure chamber and second fluid pressure chamber, it is shape Become the space between the inwall and the outer peripheral face of described stator of described cylindrical portion, described first fluid pressure chamber is located at to institute State the direction movement that stator increases, the side of volume reducing, described second fluid pressure chamber with respect to the offset of described rotary shaft It is located at the direction with increasing with respect to the offset of described rotary shaft to described stator to move, the side that volume increases；Suck Mouthful, it is located in described pump case, and to the rotation with described rotor, the inhalation area that in the plurality of pump chamber, volume increases is opened Mouthful；Delivery outlet, it is located on described platen, to the rotation with described rotor, the output of volume reducing in the plurality of pump chamber Region openings；Suction passage, it, located at described pump case, is connected with described suction inlet；Altitude chamber, it is located at described first shell Body, is to configure in axial direction in the position opposed with described delivery outlet in the length direction of described drive shaft, with described delivery outlet The mode of connection is formed；Pressure switch, it is located at the described inhalation area side of described first housing, detects output pressure；High pressure Import road, it is located at described first housing, and a side is connected with described altitude chamber, another side is with described pressure switch even Connect；Control valve receiving hole, it is to be in the radial outside of described stator and with respect to described drive shaft more positioned at described suction area The mode of domain side is located at described pump case；Tributary circuit, its from described high pressure import road way be branched off, and a side with Described high pressure imports road and connects, and another side is connected with described control valve receiving hole；Control valve, it is contained in described control valve and holds Receive in the hole, including guiding valve, described based on controlling via the output pressure from described delivery outlet that described tributary circuit imports Guiding valve, and in order to control the offset of described stator to control described first fluid pressure chamber or the pressure of described second fluid pressure chamber Power.

In addition, another kind of variable displacement vane pump of the present invention includes：Pump case, it is by the first housing and the second housing Constitute, described first housing has cylindrical portion and closes the bottom of the axial side of described cylindrical portion, described second housings close The described axial opposite side of described cylindrical portion；Drive shaft, its e axle supporting is in described pump case；The stator of ring-type, it is moving Dynamic mode is located in described cylindrical portion；Rotor, it is located in described stator, drives rotation by described drive shaft；Slit, its It is formed with multiple in the circumference of described rotor；Blade, it projects, submerging is located in described slit freely, with described stator and Described rotor is separated into multiple pump chambers together；Platen, it is located between the described bottom in described cylindrical portion and described stator, quilt Push to described stator side from the output pressure of described pump chamber output；First fluid pressure chamber and second fluid pressure chamber, it is to be formed Space between the inwall and the outer peripheral face of described stator of described cylindrical portion, described first fluid pressure chamber is located at to described The direction that stator increases with respect to the offset of described rotary shaft is moved, the side of volume reducing, and described second fluid pressure chamber sets Moving with the direction increasing with respect to the offset of described rotary shaft to described stator, the side that volume increases；Suction inlet, It is located in described pump case, to the rotation with described rotor, the inhalation area opening that in the plurality of pump chamber, volume increases； Delivery outlet, it is located on described platen, to the rotation with described rotor, the output area of volume reducing in the plurality of pump chamber Opening；Suction passage, it, located at described pump case, is connected with described suction inlet；Altitude chamber, its located at described first housing, The length direction of described drive shaft is to configure in the position opposed with described delivery outlet in axial direction, with connect with described delivery outlet Mode is formed；Pressure switch, it detects output pressure located at the described inhalation area side of described first housing；High pressure imports road, It is located at described first housing, and a side is connected with described altitude chamber；Control valve receiving hole, it is to be in the footpath of described stator More it is located at the mode of described inhalation area side located at described pump case laterally and with respect to described drive shaft；Tributary circuit, its Import the way on road from described high pressure and be branched off, and a side and described high pressure import road and be connected, another side and described control Valve receiving hole processed connects；Control valve, it is contained in described control valve and accommodates in the hole, including guiding valve, leads to based on via described branch The output pressure from described delivery outlet that road imports to control described guiding valve, and in order to control the offset of described stator to control Make described first fluid pressure chamber or the pressure of described second fluid pressure chamber；Mounting recess, it is formed through to described first shell The outside of body, and described pressure switch is arranged on its outside opening portions；Pressure switch high pressure imports road, one side with The described control valve receiving hole being imported into described output pressure connects, another side in the bottom opening of described mounting recess, with Described pressure switch connects；Drain passageway, it, in the bottom opening of described mounting recess, is connected with described suction passage side.

Therefore, it is possible to install pressure switch in the case of not leading to loop structure to complicate.

Brief description

Fig. 1 is the master of the variable displacement vane pump being applied to vehicle hydraulic power steering apparatus representing embodiment 1 View.

Fig. 2 be represent embodiment 1 be applied to the variable displacement vane pump of vehicle hydraulic power steering apparatus after View.

Fig. 3 is the right side of the variable displacement vane pump being applied to vehicle hydraulic power steering apparatus representing embodiment 1 View.

Fig. 4 is the bowing of the variable displacement vane pump being applied to vehicle hydraulic power steering apparatus representing embodiment 1 View.

Fig. 5 is the X-X sectional view of the variable displacement vane pump of embodiment 1.

Fig. 6 is the Y-Y sectional view of the variable displacement vane pump of embodiment 1.

Fig. 7 is the A-A sectional view of the variable displacement vane pump of embodiment 1.

Fig. 8 is the B-B sectional view of the variable displacement vane pump of embodiment 1.

Fig. 9 is the A-A sectional view of the variable displacement vane pump of embodiment 2.

Figure 10 is the B-B sectional view of the variable displacement vane pump of embodiment 2.

Figure 11 is the right side of the variable displacement vane pump being applied to vehicle hydraulic power steering apparatus representing embodiment 3 View.

Figure 12 is the bowing of the variable displacement vane pump being applied to vehicle hydraulic power steering apparatus representing embodiment 3 View.

Figure 13 is the B-B sectional view of the variable displacement vane pump of embodiment 3.

Figure 14 is the master of the variable displacement vane pump being applied to vehicle hydraulic power steering apparatus representing embodiment 4 View.

Figure 15 be represent embodiment 4 be applied to the variable displacement vane pump of vehicle hydraulic power steering apparatus after View.

Figure 16 is the right side of the variable displacement vane pump being applied to vehicle hydraulic power steering apparatus representing embodiment 4 View.

Figure 17 is the bowing of the variable displacement vane pump being applied to vehicle hydraulic power steering apparatus representing embodiment 4 View.

Figure 18 is the A-A sectional view of the variable displacement vane pump of embodiment 4.

Figure 19 is the B-B sectional view of the variable displacement vane pump of embodiment 4.

Figure 20 is the master of the variable displacement vane pump being applied to vehicle hydraulic power steering apparatus representing embodiment 5 View.

Figure 21 is the right side of the variable displacement vane pump being applied to vehicle hydraulic power steering apparatus representing embodiment 5 View.

Figure 22 is the bowing of the variable displacement vane pump being applied to vehicle hydraulic power steering apparatus representing embodiment 5 View.

Figure 23 is the A-A sectional view of the variable displacement vane pump of embodiment 5.

Description of reference numerals

1 variable displacement vane pump

2 precursors

2a inner bottom surface

2b cylindrical portion

Body after 3

4 pump housings

4a receiving space

5 pump units

6 drive shafts

7 rotors

7a slit

7b back pressure chamber

8 stators

9 joint rings

10 platens

10a suction passage

14a first fluid pressure chamber

14b second fluid pressure chamber

16 blades

17 pump chambers

18 inlet holes

19c1 switch pin insert port

19d1 seal member

19a suction passage

19b output channel

19c first high pressure imports road

19d second high pressure imports road

19e output channel

20 suction tubes

22 current return circuits

23rd, 25 delivery outlet

24a first pressure room

24b second pressure room

26 control valves

27 connectors

28 control valve receiving holes

28a altitude chamber

Pressure chamber in 28b

28c low-pressure chamber

29 guiding valves

30 control valve springs

31 low-pressure passage

32 access

40 pressure switches

41 switch pins

42 terminal components

43 springs

44 switch case

50 variable metering orifices

70 belt wheels

201 mounting recess

401 drain passageways

401a drain passageway

Specific embodiment

(embodiment 1)

Fig. 1～Fig. 4 is the variable displacement vane pump being applied to vehicle hydraulic power steering apparatus representing embodiment 1 Figure.Fig. 1 is front view, and Fig. 2 is rearview, and Fig. 3 is right view, and Fig. 4 is top view.Variable displacement vane pump 1 is by precursor 2 Constitute with rear 3 two main bodys of body, variable metering orifice 50 described later is arranged on precursor 2 by bolt outside main body.In addition, Inhalation area side and from pump unit 5 formed to control valve 26 side first high pressure import road 19c extended line, pressure is installed Switch 40.Hereinafter, it is described in detail.

Fig. 5, Fig. 6 are the sectional views of the variable displacement vane pump of embodiment 1.Fig. 5 is the X-X sectional view of Fig. 4, and Fig. 6 is The Y-Y sectional view of Fig. 4.Variable displacement vane pump 1 is in receiving space 4a in the pump housing 4 of precursor 2 and rear body 3 docking Accommodate pump unit 5, drive pump unit 5 to rotate to carry out pump action by using the drive shaft 6 through receiving space 4a.Driving Belt wheel 70 is provided with moving axis 6, drives drive shaft 6 to rotate using the band being erected on engine crankshaft (not shown).Precursor 2 has There is the inner bottom surface 2a as bottom of the axial side of cylindrical portion 2b and closing cylindrical portion 2b, by closing cylindrical portion with rear body 3 The axial opposite side of 2b and formed accommodate pump unit 5 receiving space 4a.

Pump unit 5 has rotor 7, substantially circular stator 8, substantially circular joint ring 9 and substantially discoid Platen 10, rotor 7 is linked with drive shaft 6, drives rotation by this drive shaft 6, and stator 8 is located at the outer circumferential side of this rotor 7, relatively The side of the offset change of this rotor 7 is swung up freely, engaging ring 9 and being fitted together to the periphery barrel surface being installed on receiving space 4a, This stator 8 is accommodated in the inner the week side of boss, platen 10 configures on the inner bottom surface 2a of precursor 2 in accommodation space 4a.

Engage ring 9 and platen 10 is positioned by alignment pin 11 with respect to the direction of rotation of the pump housing 4.In the inner circumferential engaging ring 9 Diametrically opposed with alignment pin 11 position in face, is provided with and will engage the seal member 13 of sealing between ring 9 and stator 8. Fluid pressure chamber 14a, 14b in a pair is separated using this seal member 13 in stator 8 with engaging between ring 9.That is, in stator 8 radially opposite sides form first fluid pressure chamber 14a and second fluid pressure chamber 14b respectively, by using fluid pressure chamber 14a, 14b it Between pressure official post stator 8 swing, so that the offset of stator 8 relative rotor 7 is increased and decreased.The bullet additionally, stator 8 is reset all the time Spring 15 becomes maximum direction force to the offset with rotor 7.

In the peripheral part of rotor 7, equally spacedly it is provided with multiple slit 7a radially cutting formation in the circumferential.Substantially flat The blade 16 of tabular respectively by radially freely the projecting of rotor 7, submerge in the way of be contained in each slit 7a, by using Above-mentioned each blade 16 will be circumferentially spaced for the annulus between stator 8 and rotor 7, forms multiple pump chambers 17.And, by profit Rotor 7 is driven to rotate with drive shaft 6 to the counter clockwise direction in Fig. 2, each pump chamber 17 makes its volume occur increase and decrease to divide Not circumferentially moved, carry out pump action.Additionally, each blade 16 is imported into the pressure of the working oil in back pressure chamber 7b to stator 8 Inner peripheral surface push it is ensured that pump chamber 17 fluid tight, back pressure chamber 7b is formed at the inner circumferential side of each slit 7a.

In rear body 3 on the medial surface 3a of receiving space 4a, each pump chamber 17 volume with rotor 7 rotation And the suitable part of the inhalation area that gradually expands, it is in substantially meniscate first suction that cutting is formed with when circumferentially facing Hole 18.And, this first inlet hole 18 is connected with suction passage 19a being opened on rear body 3.Thus, via with (not shown) The suction tube 20 that storage tank connects imports to the working oil in suction passage 19a, by the pumping suction effect of above-mentioned inhalation area And be inhaled in each pump chamber 17.

On the face opposed with rotor 7 in platen 10, in the position opposed with the first inlet hole 18, cutting is formed with and is somebody's turn to do First inlet hole 18 is in substantially the second inlet hole 21 of same shape.And, this second inlet hole 21 be formed on precursor 2 The current return circuit 22 of elliptical shape connects.Will seal in this current return circuit 22 and precursor 2 is close between precursor 2 and drive shaft 6 Envelope part accommodate get up recess connection, acted on by the pumping suction by above-mentioned inhalation area supply to each pump chamber 17 above-mentioned The remaining oil of seal member, prevents above-mentioned remaining oil from spilling to outside.

And, on the face opposed with rotor 7 in platen 10, each pump chamber 17 volume with rotor 7 rotation and by The suitable part of tapered little output area, it is in substantially meniscate first delivery outlet that cutting is formed with when circumferentially facing 23.And, this first delivery outlet 23 is via the first pressure on the recessed inner bottom surface 2a opposed with platen 10 that be being arranged in precursor 2 Power room 24a and connect with output channel 19b, and via second pressure room 24b with first high pressure import road 19c connect.Thus, The working oil exporting from each pump chamber 17 by the pumping output action of above-mentioned output area passes through first pressure room 24a and output is logical Road 19b via variable metering orifice 50, exports to outside the pump housing 4 via output channel 19e, sends into power steering gear (not shown) Fluid power cylinder.

Here, variable metering orifice 50 is configured to change the throttling in path using electromagnetic force action by making guiding valve Amount（Throttle diameter）, thus, by freely setting the raising seeking controlling with respect to the pressure drop characteristics of flow.This Outward, platen 10 is pushed to rotor 7 side by the pressure in first and second pressure chamber 24a, 24b.

In addition, opposed with the first delivery outlet 23 position in the medial surface 3a of rear body 3, cutting is formed with first defeated with this Portal 23 the second delivery outlets 25 substantially in same shape.So, by across each pump chamber 17 to set by way of axially symmetric Put first, second inlet hole 18,21 and first, second delivery outlet 23,25 it is ensured that the pressure of the axial both sides of above-mentioned each pump chamber 17 Balance.

Fig. 7, Fig. 8 are the sectional views of the variable displacement vane pump of embodiment 1.Fig. 7 is the A-A sectional view of Fig. 4, and Fig. 8 is The B-B sectional view of Fig. 4.As shown in Figure 7, Figure 8, second pressure room 24b imports road 19c with the first high pressure and is connected, this first high pressure Import road 19c to be abreast opened in precursor 2 with platen 10.And, second pressure room 24b and the second high pressure import road 19d（Point Forehearth limb）Connect, this second high pressure is imported road 19d and opened up substantially in parallel with drive shaft 6, logical to control valve 26 described later supply Cross the high pressure before variable metering orifice 50.Second high pressure is imported road 19d and is opened up substantially in parallel with drive shaft 6, opposed with rear body 3 Side upper shed, sealed by making rear body 3 be arranged on precursor 2.Specifically, the second high pressure imports road 19d and is opening Mouth is formed with seal groove, by seal member fluid-tight seal at periphery.In addition, the first high pressure imports road 19c being formed through to front The outside of body 2, in its outside opening portions, is formed with the mounting recess 201 installing pressure switch 40.In mounting recess 201 Bottom surface is formed with switch pin insert port 19c1, and this switch pin insert port 19c1 imports road 19c with the first high pressure and connects, and with the It is slightly larger that one high pressure imports road 19c phase diameter group.

Pressure switch 40 has terminal component 42, switch pin 41 and spring 43, and terminal component 42 is held in switch case 44 And electrically connect with outside wiring, switch pin 41 insertion switch pin insert port 19c1 is interior and can relatively switch case 44 carry out relatively Mobile, spring 43 exerts a force to the direction leaving terminal component 42 to this switch pin 41.Insert switch pin insert port in switch pin 41 In the state of in 19c1, when the hydraulic pressure in the first high pressure importing road 19c is changed into high pressure, switch pin 41 resists the elasticity of spring 43 Power and start move, contact with terminal component 42.Thus, pressure switch 40 detects the high pressure conditions of regulation set in advance.

It is formed with space in mounting recess 201, the minim gap between switch pin insert port 19c1 and switch pin 41 The working oil revealed flows in this space.In addition, in mounting recess 201, being connected with the drain passageway connecting with current return circuit 22 401, the working oil of leakage is suitably discharged to current return circuit 22 by drain passageway 401, thus adapting to by switch pin 41 action institute The differential pressure in mounting recess 201 determining keeps and volume changes etc..

Additionally, drain passageway 401 is formed as the angle that can be opened up by the drill bit that the opening from mounting recess 201 sideling inserts Degree.In other words, it is set to when drain passageway 401 extends to hull outside, the knot passing through in the open area of mounting recess 201 Structure.Therefore, drain passageway 401 can be imported with the first high pressure and be sealed it is not necessary to separately utilize by pressure switch 40 together with the 19c of road Sealing bolt etc. is sealed.

So, import road because the first high pressure leading to control valve 26 imports road 19c with the pressure leading to pressure switch 40 Can partly be shared, therefore, it is possible to install pressure switch 40 in the case of not leading to loop structure to complicate.In addition, Because pressure switch 40 configures in inhalation area side, therefore, easily formed and arrange for the pressure being fed into pressure switch 40 side The drain passageway 401 going out.In addition, in the case of there is no the structure of pressure switch, needing to install in the position of pressure switch 40 Open up the sealing bolt in the case that the first high pressure imports road 19c using drill bit, but due to just can be carried out using pressure switch 40 Sealing, therefore, it is possible to save sealing bolt.

The inside of the upper end side in precursor 2, along the direction orthogonal with drive shaft 6（The left and right directions of Fig. 6）It is provided with control The control valve 26 as pressure control mechanism of pump output pressure.This control valve 26 includes control valve receiving hole 28, substantially has bottom Cylindric guiding valve 29 and control valve spring 30, control valve receiving hole 28 left side from Fig. 6 on precursor 2 opens up to the right, Close the peristome in left side in Fig. 6 using connector 27, guiding valve 29 is contained in this control valve in the way of sliding freely in the axial direction In receiving hole 28, control valve spring 30 exerts a force to connector 27 side to this guiding valve 29.

In control valve receiving hole 28, respectively altitude chamber 28a, middle pressure chamber 28b and low-pressure chamber 28c are separated into by guiding valve 29, Altitude chamber 28a is formed between connector 27 and guiding valve 29, the upstream side of the variable metering orifice 50 in output channel 19b way Hydraulic pressure, the namely hydraulic pressure of second pressure room 24b are imported into this altitude chamber 28a, and middle pressure chamber 28b accommodates control valve spring 30, can The hydraulic pressure becoming the downstream of metering orifice 50 is imported into pressure chamber 28b in this, and low-pressure chamber 28c is formed at the outer circumferential side of guiding valve 29, pumping Enter pressure and import this low-pressure chamber 28c from suction passage 19a via low-pressure passage 31.And, guiding valve 29 is based on middle pressure chamber 28b and height The pressure differential of pressure chamber 28a is axially moveable.

Specifically, less with the pressure differential of altitude chamber 28a in middle pressure chamber 28b, when guiding valve 29 is located at connector 27 side, by the , to low-pressure chamber 28c opening, this low-pressure chamber 28c's is relatively low for the access 32 that one fluid pressure chamber 14a is connected with control valve receiving hole 28 Hydraulic pressure is imported in first fluid pressure chamber 14a.On the other hand, the pressure differential in middle pressure chamber 28b and altitude chamber 28a increases, guiding valve The 29 opposing active forces of control valve springs 30 and when being axially moveable, the connection of low-pressure chamber 28c and first fluid pressure chamber 14a is gradually Separated, altitude chamber 28a is connected with first fluid pressure chamber 14a via access 32.Thus, the higher hydraulic pressure quilt of altitude chamber 28a Import in first fluid pressure chamber 14a.That is, being selectively introduced low-pressure chamber 28c or height into first fluid pressure chamber 14a The hydraulic pressure of pressure chamber 28a.

And, import pump intake pressure all the time into second fluid pressure chamber 14b, in the importing into first fluid pressure chamber 14a During the hydraulic pressure of low-pressure chamber 28c, using the active force of back-moving spring 15, stator 8 is located at the position of the offset maximum and rotor 7 between Put（Leftward position in Fig. 6）, pump delivery maximum.On the other hand, in the importing altitude chamber 28a into first fluid pressure chamber 14a During hydraulic pressure, using the pressure of this first fluid pressure chamber 14a, the active force of back-moving spring 15 resisted by stator 8, to reduce second fluid The mode of pressure chamber 14b volume swings, and this stator 8 is reduced with the offset of rotor 7, and pump delivery reduces.

As described above, in embodiment 1, following effects effect can be obtained.

（1）The variable displacement vane pump of the present embodiment has：Pump case, it is by precursor 2（First housing）With rear body 3 （Second housing）Constitute, precursor 2 has the inner bottom surface 2a of the axial side of cylindrical portion 2b and closing cylindrical portion 2b（Bottom）, rear body The axial opposite side of 3 closing cylindrical portion 2b；Drive shaft 6, its e axle supporting is in pump case；The stator 8 of ring-type, it is moving Mode is located in cylindrical portion 2b；Rotor 7, it is located in stator 8, drives rotation by drive shaft 6；Slit 7a, it is in the week of rotor 7 It has been upwardly formed multiple；Blade 16, it projects, submerging is located in slit 7a freely, is separated into together with stator 8 and rotor 7 Multiple pump chambers 17；Platen 10, it is located between the inner bottom surface 2a in cylindrical portion 2b and stator 8, the output being exported from pump chamber 17 Pressure pushes to stator 8 side；First fluid pressure chamber 14a and second fluid pressure chamber 14b, it is to be formed at cylindrical portion inwall and stator Space between 8 outer peripheral face, and first fluid pressure chamber 14a be located at to stator 8 relative rotation axi offset increase Direction is moved, the side of volume reducing, and second fluid pressure chamber 14b is located at and increases with to the offset of stator 8 relative rotation axi Direction move, volume increase side；Inlet hole 18（Suction inlet）, it is located in pump case, to the rotation with rotor 7, The inhalation area opening that in multiple pump chambers 17, volume increases；Delivery outlet 23, it is located on platen 10, to the rotation with rotor 7, The output area opening of volume reducing in multiple pump chambers 17；Suction passage 19a, it, located at pump case, is connected with inlet hole 18；The Two altitude chamber 24b, it is to configure in axial direction in the position opposed with delivery outlet 23 located at precursor 2 in the length direction of drive shaft 6 Put, formed in the way of connecting with delivery outlet 23；Pressure switch 40, it is located at the inhalation area side of precursor 2, detection output pressure Power；First high pressure imports road 19c, and it is located at precursor 2, and a side is connected with the second altitude chamber 24b, and another side is opened with pressure Close 40 connections；Control valve receiving hole 28, it is to be in the radial outside of stator 8 and with respect to drive shaft 6 more positioned at inhalation area The mode of side is located at pump case；Second high pressure imports road 19d（Tributary circuit）, it imports the way of road 19c from the first high pressure and divides Prop up out, and a side imports road 19c with the first high pressure and is connected, another side is connected with control valve receiving hole 28；Control valve 26, It is contained in control valve receiving hole 28, including guiding valve 29, based on importing that road 19d imports via the second high pressure from delivery outlet 23 output pressure carrys out spool control valve 29, and in order to control the offset of stator 8 and control first fluid pressure chamber 14a or The pressure of two fluid pressure chambers 14b.

（2）Second high pressure imports road 19d and is formed as almost parallel with drive shaft 6.Therefore, the second high pressure imports road 19d and exists The side upper shed opposed with rear body 3, therefore, it is possible to by making rear body 3 be arranged on precursor 2 to be sealed it is not necessary to sealing bolt Can be sealed Deng just.

（3）The variable displacement vane pump of the present embodiment includes：The current return circuit 22 of elliptical shape, itself and suction passage 19a connects；Mounting recess 201, it is formed through to the outside of precursor 2, and pressure switch 40 is arranged on its outer openings portion Point；Drain passageway 401, it, in the bottom opening of mounting recess 201, current return circuit 22 is connected with mounting recess 201.

Therefore, the working oil being leaked to mounting recess 201 can return to current return circuit 22 it can be ensured that pressure switch 40 Suitable action.Further, since in the bottom opening of mounting recess 201, connecing therefore, it is possible to pressure switch 40 is pressed into configuration The position of nearly mounting recess 201 bottom, therefore, it is possible to seek the miniaturization of device profile.Further, since current return circuit 22 is formed For elliptical shape, therefore, it is possible to improve the design freedom opening up direction etc. of current return circuit 22.

（4）When making drain passageway 401 extend to hull outside, the path of this prolongation is in the open region of mounting recess 201 Pass through in domain.

Therefore, drain passageway 401 can be imported with the first high pressure and be sealed by pressure switch 40 it is not necessary to another together with the 19c of road Row is sealed using sealing bolt etc..

(embodiment 2)

Then, embodiment 2 is illustrated.Basic structure is same as Example 1, therefore difference is illustrated.Figure 9th, Figure 10 is the sectional view of the variable displacement vane pump of embodiment 2.Fig. 9 is the A-A sectional view of Fig. 4, and Figure 10 is the B-B of Fig. 4 Sectional view.As shown in Figure 10, in example 2, road 19c is imported with the first high pressure and the second high pressure imports the branch of road 19d Divide side than control valve receiving hole 28 side closer to the mode of drive shaft 6, be formed obliquely the second high pressure and import road 19d.That is, pressure Switch 40 is necessary to ensure that the length scale of switch pin insert port 19c1 for switch pin 41 insertion, and the position of control valve 26 is also subject to shell The restriction of body intensity etc..Then, tilted by making the second high pressure import road 19d, and configure component near pump unit 5 side, The first high pressure can be shortened and import road 19c.Therefore, as shown in figure 9, the short transverse of variable displacement vane pump 1 can be reduced Size.Additionally, it is impossible to utilize rear body 3 sealing the second high pressure to import road 19d as in Example 1 in the case of being somebody's turn to do, therefore separately sharp Sealed with seal member 19d1.

As described above, in example 2, following effects effect can be obtained.

（5）Road 19c is imported with the first high pressure and the second high pressure imports the component side of road 19d than control valve receiving hole 28 Side, closer to the mode of drive shaft 6, is formed obliquely the second high pressure and imports road 19d.Therefore, it is possible to seek the small-sized of device profile Change.

(embodiment 3)

Then, embodiment 3 is illustrated.Basic structure is same as Example 1, therefore only difference is illustrated. Figure 11, Figure 12 are the figures of the variable displacement vane pump being applied to vehicle hydraulic power steering apparatus representing embodiment 3.Figure 11 is right view, and Figure 12 is top view.In addition, Figure 13 is the B-B sectional view of the variable displacement vane pump of embodiment 3.In reality Apply in example 1, open up the first high pressure substantially in parallel with platen 10 and import road 19c.On the other hand, in embodiment 3, with closer to Then the mode further away from rear body 3 is formed obliquely the first high pressure importing road 19c ' for pressure switch 40 side, and this puts different.Change speech It, the first high pressure imports road 19c ' and swings to the configuration of belt wheel side.That is, exist and configure the suction in same side with pressure switch 40 Enter path 10a and output channel 19e, pipe arrangement etc. is connected with these paths, thereby, it is ensured that the space on this side has just become problem. Now, it is able to ensure that space by making pressure switch 40 swing to the configuration of belt wheel side, it can be avoided that pipe arrangement etc. and pressure switch 40 Interfere.

（6）By suction passage 19a, to outside pump case, the output channel 19e of derivation output pressure and pressure switch 40 set In the inhalation area side of precursor 2, in the way of closer to pressure switch 40 side then further away from rear body 3, it is formed obliquely first high Pressure imports road 19c '.

It is accordingly possible to ensure the space of casing peripheral, it can be avoided that pipe arrangement etc. is interfered with pressure switch 40.

(embodiment 4)

Then, embodiment 4 is illustrated.Basic structure is same as Example 1, therefore difference is illustrated.Figure 14～Figure 19 is the figure of the variable displacement vane pump being applied to vehicle hydraulic power steering apparatus representing embodiment 4.Figure 14 is front view, and Figure 15 is rearview, and Figure 16 is right view, and Figure 17 is top view.Variable displacement vane pump 1 is by precursor 2 He 3 two main bodys of body are constituted afterwards, and variable metering orifice 50 described later is arranged on precursor 2 by bolt outside main body.In addition, inhaling Enter area side, from pump unit 5 to radial outside, be sequentially installed with control valve 26 and pressure switch 40.Hereinafter, carry out specifically Bright.

Figure 18, Figure 19 are the sectional views of the variable displacement vane pump of embodiment 4, and Figure 18 is the A-A sectional view of Figure 17, figure 19 is the B-B sectional view of Figure 17.Additionally, the X-X section of Figure 19 is identical with Fig. 5, the basic structure of variable displacement vane pump 1 with Embodiment 1 is identical, therefore, omits the explanation to common structure.

As shown in figure 19, second pressure room 24b imports road 19c ' with the first high pressure and is connected, and this first high pressure imports road 19c ' Abreast it is opened in precursor 2 with platen 10.And, second pressure room 24b and the second high pressure import road 19d（Tributary circuit）Even Connect, this second high pressure is imported road 19d and opened up substantially in parallel with drive shaft 6, is fed through variable flow measurement to aftermentioned control valve 26 High pressure before mouth 50.Second high pressure is imported road 19d and is opened up substantially in parallel with drive shaft 6, opens on the side opposed with rear body 3 Mouthful, sealed by making rear body 3 be arranged on precursor 2.Specifically, the second high pressure imports road 19d shape at opening periphery Become to have seal groove, by seal member fluid-tight seal.In addition, the first high pressure imports road 19c ' being formed through to the outside of precursor 2, Close its outside opening portions using seal member 190.

The inside of the upper end side in precursor 2, along the direction orthogonal with drive shaft 6（The left and right directions of Figure 18）It is provided with control The control valve 26 as pressure control mechanism of pump output pressure.This control valve 26 includes control valve receiving hole 28, substantially has bottom Cylindric guiding valve 29 and control valve spring 30, control valve receiving hole 28 left side from Figure 18 on precursor 2 opens up to the right, Close the peristome in left side in Figure 18 using connector 27, guiding valve 29 is contained in this control valve in the way of sliding freely in the axial direction In receiving hole 28, control valve spring 30 exerts a force to connector 27 side to this guiding valve 29.

With control valve receiving hole 28 adjoining position, be formed with install pressure switch 40 mounting recess 201.Installing The bottom surface of recess 201, is formed with the pressure switch being connected with altitude chamber 28a high pressure and imports road 19f, high in this pressure switch Pressure imports in the opening by mounting recess 201 side of road 19f, is formed with the switch pin insertion for switch pin 41 described later insertion Mouth 19c1.

Pressure switch 40 has terminal component 42, switch pin 41 and spring 43, and terminal component 42 is held in switch case 44 And electrically connect with outside wiring, switch pin 41 insertion switch pin insert port 19c1 is interior and can relatively switch case 44 carry out relatively Mobile, spring 43 exerts a force to the direction leaving terminal component 42 to this switch pin 41.Insert switch pin insert port in switch pin 41 In the state of in 19c1, when the hydraulic pressure in pressure switch high pressure importing road 19f is changed into high pressure, switch pin 41 resists spring 43 Elastic force and start move, contact with terminal component 42.Thus, pressure switch 40 detects the high pressure of regulation set in advance State.

It is formed with space in mounting recess 201, the minim gap between switch pin insert port 19c1 and switch pin 41 The working oil revealed flows in this space.In addition, in mounting recess 201, being connected with the drain passageway connecting with low-pressure chamber 28c 401a, the working oil of leakage suitably passes through drain passageway 401a and discharges to low-pressure chamber 28c, thus adapting to by switch pin 41 action institute The differential pressure in mounting recess 201 determining keeps and volume changes etc..

Additionally, what drain passageway 401a was formed as being opened up by the drill bit that the opening from mounting recess 201 sideling inserts Angle.In other words, it is set to, when drain passageway 401a extends to hull outside, pass through in the open area of mounting recess 201 Structure.Therefore, drain passageway 401a can be imported with pressure switch high pressure and be sealed by pressure switch 40 together with the 19f of road, no Need separately to be sealed using sealing bolt etc..

So, import road 19f by the altitude chamber 28a of control valve 26 and pressure switch 40 by using pressure switch with high pressure Connect, pressure switch 40 can be installed in the case of not leading to loop structure to complicate.Further, since pressure switch 40 and tool The control valve receiving hole 28 having low-pressure chamber 28c adjacently configures, and is therefore easily formed for being fed into pressure switch 40 side The drain passageway 401a of pressure venting.

As described above, in example 4, following effects effect can be obtained.

（7）The variable displacement vane pump of the present embodiment includes：Pump case, it is by precursor 2（First housing）With rear body 3 （Second housing）Constitute, precursor 2 has the inner bottom surface 2a of the axial side of cylindrical portion 2b and closing cylindrical portion 2b（Bottom）, rear body The axial opposite side of 3 closing cylindrical portion 2b；Drive shaft 6, its e axle supporting is in pump case；The stator 8 of ring-type, it is moving Mode is located in cylindrical portion 2b；Rotor 7, it is located in stator 8, drives rotation by drive shaft 6；Slit 7a, it is in the week of rotor 7 It has been upwardly formed multiple；Blade 16, it projects, submerging is located in slit 7a freely, is separated into together with stator 8 and rotor 7 Multiple pump chambers 17；Platen 10, it is located between the inner bottom surface 2a in cylindrical portion 2b and stator 8, the output being exported from pump chamber 17 Pressure pushes to stator 8 side；First fluid pressure chamber 14a and second fluid pressure chamber 14b, it is to be formed at cylindrical portion inwall and stator Space between 8 outer peripheral face, and first fluid pressure chamber 14a be located at to stator 8 relative rotation axi offset increase Direction is moved, the side of volume reducing, and second fluid pressure chamber 14b is located at and increases with to the offset of stator 8 relative rotation axi Direction move, volume increase side；Inlet hole 18（Suction inlet）, it is located in pump case, to the rotation with rotor 7, The inhalation area opening that in multiple pump chambers 17, volume increases；Delivery outlet 23, it is located on platen 10, to the rotation with rotor 7, The output area opening of volume reducing in multiple pump chambers 17；Suction passage 19a, it, located at pump case, is connected with inlet hole 18；The Two altitude chamber 24b, it is to configure in axial direction in the position opposed with delivery outlet 23 located at precursor 2 in the length direction of drive shaft 6 Put, formed in the way of connecting with delivery outlet 23；Pressure switch 40, it is located at the inhalation area side of precursor 2, detection output pressure Power；First high pressure imports road 19c ', and it is located at precursor 2, and a side is connected with altitude chamber 28a；Control valve receiving hole 28, its with It is in the radial outside of stator 8 and be more located at the mode of inhalation area side located at pump case with respect to drive shaft 6；Second high pressure is led Approach 19d（Tributary circuit）, it imports road 19c ' way from the first high pressure and is branched off, and a side imports road with the first high pressure 19c ' connects, and another side is connected with control valve receiving hole 28；Control valve 26, it is contained in control valve receiving hole 28, including Guiding valve 29, based on the output pressure from delivery outlet 23 importing via the second high pressure importing road 19d come spool control valve 29, and In order to control the offset of stator 8 and control first fluid pressure chamber 14a or the pressure of second fluid pressure chamber 14b；Mounting recess 201, it is formed through to the outside of precursor 2, and pressure switch 40 is arranged on its outside opening portions；Pressure switch high pressure Import road 19f, one side is connected with the control valve receiving hole 28 being imported into output pressure, and another side is in mounting recess 201 Bottom opening, be connected with pressure switch 40；Drain passageway 401a, its in the bottom opening of mounting recess 201, with suction passage Side connects.

So, due to importing road 19f using pressure switch high pressure, control valve 26 is connected with pressure switch 40, therefore, Pressure switch 40 can be installed in the case of not leading to loop structure to complicate.Further, since pressure switch 40 is configured in Inhalation area side, therefore, easily forms the drain passageway 401a of the pressure venting for being fed into pressure switch 40 side.Separately Outward, in the case of there is no the structure of pressure switch, need high using opening up first in the position of pressure switch 40 installation drill bit Pressure imports the sealing bolt in the case of the 19c ' of road, but due to just can be sealed using pressure switch 40, therefore, it is possible to save Sealing bolt.Further, since control valve 26 is in the position closer to mounting recess 201 compared with current return circuit 22, therefore, it is possible to Seek to shorten drain passageway 401a.

（8）When making drain passageway 401a extend to hull outside, the path of this prolongation is in the open region of mounting recess 201 Pass through in domain.

Therefore, drain passageway 401a can with the first high pressure import be sealed by pressure switch 40 together with the 19c ' of road it is not necessary to Separately sealed using sealing bolt etc..

（9）Second high pressure imports road 19d and is formed as almost parallel with drive shaft 6.Therefore, the second high pressure imports road 19d and exists The side upper shed opposed with rear body 3, therefore, it is possible to by making rear body 3 be arranged on precursor 2 to be sealed it is not necessary to sealing bolt Can be sealed Deng just.

（10）In addition it is also possible to by suction passage 19a, to outside pump case derive output pressure output channel 19e and Pressure switch 40 is located at the inhalation area side of precursor 2, by closer to pressure switch 40 side then further away from rear body 3 in the way of obliquely Form the first high pressure and import road 19c '.In the case of the being somebody's turn to do it can be ensured that space of casing peripheral, it can be avoided that pipe arrangement etc. and pressure leave Close 40 interference.

(embodiment 5)

Then, embodiment 5 is illustrated.Basic structure is same as Example 4, therefore difference is illustrated.Figure 20～Figure 23 is the figure of the variable displacement vane pump being applied to vehicle hydraulic power steering apparatus representing embodiment 5.Figure 20 is front view, and Figure 21 is right view, and Figure 22 is top view.Figure 23 is the sectional view of the variable displacement vane pump of embodiment 5. Figure 23 is the A-A sectional view of Figure 22.In example 4, as drain passageway 401a, be formed as the low-pressure chamber with control valve 26 The structure that 28c connects.On the other hand, in embodiment 5, the bottom of mounting recess 201 is connected by formation with current return circuit 22 Drain passageway 401a.As illustrated in embodiment 1, will seal precursor 2 and driving in this current return circuit 22 and precursor 2 Seal member between axle 6 accommodates the recess connection got up, and is acted on to each pump by the pumping suction by above-mentioned inhalation area Room 17 supplies the remaining oil of above-mentioned seal member, prevents above-mentioned remaining oil from spilling to outside.

It is formed with space in mounting recess 201, from the switch pin being formed at pressure switch high pressure importing road 19f end The working oil that minim gap between insert port 19c1 and switch pin 41 is revealed flows in this space.In addition, in mounting recess 201, it is connected with the drain passageway 401a connecting with current return circuit 22, the working oil of leakage suitably passes through drain passageway 401a to returning Logical circulation road 22 is discharged, thus the differential pressure adapting in the mounting recess 201 that determined by switch pin 41 action keeps and volume change Deng.

As described above, in embodiment 5, following effects effect can be obtained.

（11）The backflow that the variable displacement vane pump of the present embodiment has the elliptical shape connecting with suction passage 19a is led to Road 22, drain passageway 401a is connected with the current return circuit 22 of suction passage side.

Above the present invention is illustrated based on embodiment, but the invention is not restricted to above-described embodiment, it would however also be possible to employ other knots Structure.For example, in an embodiment, be formed as the structure that drain passageway 401 is connected with current return circuit 22, but be not limited to flow back logical The situation that road 22 connects is it is also possible to be formed as the structure discharged to other low-pressure sections.For example, by drain passageway 401 and control In the case that the low-pressure chamber 28c of valve 26 processed connects, preferably formed as follows, i.e. the excretion being formed in control valve 26 is led to Road is in a straight line with drain passageway 401.In the case of being somebody's turn to do, both drain passage and drain passageway can be opened up simultaneously, The simplification of manufacturing process can be sought.

Claims

1. a kind of variable displacement vane pump is it is characterised in that have：

Pump case, it is made up of the first housing and the second housing, and described first housing has cylindrical portion and closes described cylindrical portion The side of axial direction bottom, the described axial opposite side of cylindrical portion described in described second housings close；

Drive shaft, its e axle supporting is in described pump case；

The stator of ring-type, it is located in described cylindrical portion in the way of can moving；

Rotor, it is located in described stator, drives rotation by described drive shaft；

Slit, it is formed with multiple in the circumference of described rotor；

Blade, it projects, submerging is located in described slit freely, is separated into multiple pumps together with described stator and described rotor Room；

Platen, it is located between the described bottom in described cylindrical portion and described stator, is pressed by the output exporting from described pump chamber Power pushes to described stator side；

First fluid pressure chamber and second fluid pressure chamber, its be formed at the inwall of described cylindrical portion and described stator outer peripheral face it Between space, described first fluid pressure chamber be located at to the relatively described drive shaft of described stator offset increase direction move Dynamic, the side of volume reducing, described second fluid pressure chamber is located at and increases with to the offset of the relatively described drive shaft of described stator Big direction is moved, the side that volume increases；

Suction inlet, it is located in described pump case, to the rotation with described rotor, the suction that in the plurality of pump chamber, volume increases Enter region openings；

Delivery outlet, it is located on described platen, to the rotation with described rotor, the output of volume reducing in the plurality of pump chamber Region openings；

Suction passage, it, located at described pump case, is connected with described suction inlet；

Altitude chamber, its located at described first housing, the length direction of described drive shaft be configure in axial direction with described output The opposed position of mouth, is formed in the way of being connected with described delivery outlet；

Pressure switch, it is located at the described inhalation area side of described first housing, detects output pressure；

High pressure imports road, and it is located at described first housing, and a side is connected with described altitude chamber, another side and described pressure Switch connects；

Control valve receiving hole, it is to be in the radial outside of described stator and with respect to described drive shaft more positioned at described suction area The mode of domain side is located at described pump case；

Tributary circuit, it imports the way on road from described high pressure and is branched off, and a side imports road with described high pressure and is connected, separately One side is connected with described control valve receiving hole；

Control valve, it is contained in described control valve and accommodates in the hole, including guiding valve, based on being derived from of importing via described tributary circuit The output pressure of described delivery outlet controlling described guiding valve, and in order to control the offset of described stator to control described first Fluid pressure chamber or the pressure of described second fluid pressure chamber；

The current return circuit of elliptical shape, it is connected with described suction passage；

Mounting recess, it is formed through to the outside of described first housing, and described pressure switch is arranged on its outer openings Part；

Drain passageway, it, in the bottom opening of described mounting recess, described current return circuit is connected with described mounting recess.

2. variable displacement vane pump according to claim 1 it is characterised in that

With the component side on described tributary circuit and described high pressure importing road than control valve receiving hole side closer to described driving The mode of axle, is formed obliquely described tributary circuit.

3. variable displacement vane pump according to claim 1 it is characterised in that

Described tributary circuit is formed as almost parallel with described drive shaft.

4. variable displacement vane pump according to claim 1 it is characterised in that

When making described drain passageway to pump case lateral, the path of this prolongation is logical in the open area of mounting recess Cross.

5. variable displacement vane pump according to any one of claim 1 to 4 it is characterised in that

By described suction passage, derive the output channel of described output pressure to outside described pump case and described pressure switch sets In the inhalation area side of described first housing,

In the way of closer to described pressure switch side then further away from described second housing, it is formed obliquely described high pressure and imports Road.

6. a kind of variable displacement vane pump is it is characterised in that include：

Drive shaft, its e axle supporting is in described pump case；

Slit, it is formed with multiple in the circumference of described rotor；

Pressure switch, it detects output pressure located at the described inhalation area side of described first housing；

High pressure imports road, and it is located at described first housing, and a side is connected with described altitude chamber；

Pressure switch high pressure imports road, and one side is connected with the described control valve receiving hole being imported into described output pressure, Another side, in the bottom opening of described mounting recess, is connected with described pressure switch；

Drain passageway, it, in the bottom opening of described mounting recess, is connected with described suction passage side.

7. variable displacement vane pump according to claim 6 it is characterised in that

There is the current return circuit of the elliptical shape connecting with described suction passage,

Described drain passageway is connected with the described current return circuit of described suction passage side.

8. variable displacement vane pump according to claim 7 it is characterised in that

9. the variable displacement vane pump according to any one of claim 6 to 8 it is characterised in that

10. variable displacement vane pump according to claim 6 it is characterised in that