CN102333956A - Direct control linear variable displacement vane pump - Google Patents

Direct control linear variable displacement vane pump Download PDF

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Publication number
CN102333956A
CN102333956A CN201080009310XA CN201080009310A CN102333956A CN 102333956 A CN102333956 A CN 102333956A CN 201080009310X A CN201080009310X A CN 201080009310XA CN 201080009310 A CN201080009310 A CN 201080009310A CN 102333956 A CN102333956 A CN 102333956A
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CN
China
Prior art keywords
slide block
arm
liquid pump
pump system
actuator shaft
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Pending
Application number
CN201080009310XA
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Chinese (zh)
Inventor
F·斯特拉图拉特
P·L·M·常
G·哈达
P·克鲁格
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STT Technologies Inc
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STT Technologies Inc
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Publication date
Application filed by STT Technologies Inc filed Critical STT Technologies Inc
Publication of CN102333956A publication Critical patent/CN102333956A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
    • F04C14/223—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/16—Controlling lubricant pressure or quantity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N13/00—Lubricating-pumps
    • F16N13/20—Rotary pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control
    • F16H57/0436—Pumps

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)

Abstract

A fluid pumping system for a power transmission device includes a variable displacement vane pump having a housing containing a rotor, a plurality of vanes coupled to the rotor and a linearly translatable slide for varying the displacement of the pump. A control system varies the displacement of the pump and provides a fluid output pressure selected from a continuously variable range of output pressures which are independent from the operating speed of the pump. The control system includes a linear actuator for moving the slide between minimum and maximum pump displacement positions. The linear actuator includes an electric stepper motor for bi-directionally translating an actuator shaft acting on the slide.

Description

Directly control linear variable displacement vane pump
The cross reference of related application
The preference that No. the 61/157th, 601, the U.S. Provisional Application that the application requires to submit on March 5th, 2009.The whole of above-mentioned application disclose by reference in this combination.
Technical field
The disclosure relates to the liquid pump system that is used for automobile.More specifically, the disclosure relates to the variable displacement vane pump and the control system of the continuous change output flow that is used to provide the service speed that is independent of pump.
Background technique
Mechanical system such as internal-combustion engine and automatic transmission case generally includes the lubricant pump that under pressure subtense angle of many moving links and/or mechanical system is provided lubricant oil.In most of the cases, lubricant pump is driven by the rotating member of mechanical system.The service speed of pump changes along with the service speed of mechanical system with output.Yet the lubricating requirement of mechanical system is not exclusively directly corresponding with the service speed of mechanical system usually.
Front known fixed discharge capacity lubricant pump is typically designed to: enough flowing is provided under the situation corresponding to the relatively low speed of engine idle and maximum oiling agent operating temperature.This design concept causes lubricant oil overfeeding during the major part of vehicle operating.In at least a layout, reduction valve is provided to overlubricate oil is back to pump intake or oil groove to avoid the overvoltage condition in the mechanical system.Under some serviceability, the mistake output of pressurized lubrication oil possibly be mechanical system required 500%.The result is that significant amount of energy is used to pressurized lubrication oil, and this lubricant oil is discharged through reduction valve subsequently.
Recently, variable displacement vane pump is used as lubricating pump.These pumps generally include control ring or other mechanism, and therefore this control ring or other mechanism can change its output by operation to change the swept volume of pump under a service speed.Usually, provide pressurized lubrication oil, so that in the whole desired extent of the serviceability of mechanical system, change pump delivery to avoid the overvoltage condition in the motor from pump output to feedback mechanism.
Though this variable-displacement pump provides some improvement with respect to constant flow pump aspect energy efficiency; But because pump displacement is directly or indirectly controlled by the delivery pressure of pump; The delivery pressure of said pump changes along with the service speed of mechanical system; And do not change with the change demand of mechanical system, therefore possibly cause the significant amount of energy loss.
Another variable-displacement pump control system is disclosed in U. S. Patent the 7th, 018, in No. 178.Control system comprises the o that is attached to variable-displacement pump, and this o is used for during power operation, changing pump delivery.Though o can provide the control to pump of additional degree, there are a plurality of defectives in its application.Particularly, o requires continuous supplying electric current usually so that it is all worked during the whole operation of pump.Power consumption possibly offset control pump so that pump provides the overlubricate agent benefit that mobile time minimum is brought.In addition, the maximum force ability of o receives the restriction to the size of its electromagnetic field that applies and electric current.Use for some, provide the size of the required electromagnetic field of the active force of expectation to make and can't o be installed in the vehicle environmental.Therefore, need to improve lubrication system and reduce to minimum in the flow of lubricant of making expectation, will make the required energy of flow of lubricant.
Summary of the invention
This joint provides total general view of the present disclosure, and the systematicness that is not its four corner or all characteristics discloses.
A kind of liquid pump system that is used for power transmitting deice; It comprises: variable displacement vane pump; This variable displacement vane pump has and comprises rotor, a plurality of blade and shell that can linearly moving slide block; Said a plurality of blade is attached to this rotor, said can being used for changing this pump delivery through changing its off-centre by linearly moving slide block.Control system changes this pump delivery and the output liquid pressure of the delivery pressure that is selected from the continuous variable scope is provided, and the delivery pressure of said continuous variable scope is independent of the service speed of this pump.Said control system comprises linear actuators, and said linear actuators is used to make this slide block between minimum and maximum pump displacement position, to move.Said linear actuators comprises electric stepper motor, and said electric stepper motor is used for the actuator shaft of two-way migration on this slide block.
In addition, this disclosure a kind of liquid pump system that is used for power transmitting deice, it comprises variable displacement vane pump, this variable displacement vane pump has can linearly moving slide block, saidly can be used to change this pump delivery by linearly moving slide block.Linear actuators moves this slide block between minimum and maximum pump displacement position.Said linear actuators comprises electric motor, and said electric motor is used for rotary driving part.Said driver part engages driven actuator shaft, and linearity moves so that actuator shaft responds the rotation of driver part.This control system comprises controller, and said controller sends signal to said actuator so that extend or shrink said actuator shaft, thereby changes pump displacement.
Other application will be obvious from the explanation that provides at this.Explanation in this general view is intended to the only purpose of example with concrete example, and is not intended to limit the scope of the present disclosure.
Description of drawings
Accompanying drawing described here is merely and selects embodiment but not the illustrative purpose of all possible mode of execution, is not intended to limit the scope of the present disclosure;
Fig. 1 is the cross-sectional view of exemplary directly actuated variable displacement vane pump;
Fig. 2 is the local enlarged perspective of the pumping system described among Fig. 1;
Fig. 3 is the fragmentary, perspective view that connects the connector of actuator shaft and slide block;
Fig. 4 is the schematic representation that is used to control the open-loop control system of variable displacement vane pump;
Fig. 5 is the schematic representation of the closed loop control system describing to cooperate with variable displacement vane pump;
Fig. 6 is the fragmentary, perspective view of another variable displacement vane pump;
Fig. 7 is the planimetric map of layout of slide block and the actuator of the pump described among Fig. 6; And
Fig. 8 is the planimetric map of the shell that is used for pump shown in Fig. 6.
In a plurality of accompanying drawings, corresponding reference number is indicated corresponding component.
Embodiment
To exemplary embodiment more fully be described with reference to accompanying drawing now.
With reference to accompanying drawing 1-3, pumping system 10 vertical (plumbed) illustrates to be communicated with exemplary power transmitting deice 12.Power transmitting deice 12 is illustrated by exemplary, and can comprise any amount of device, and this device comprises internal-combustion engine, speed changer, transfer case and shaft assembly etc.Pumping system 10 comprises variable-displacement pump 14, and this variable-displacement pump comprises the shell 16 with flange 17, and this flange 17 is used for pump 14 is mounted to power transmitting deice 12.Replacedly, shell 16 can be integrally formed with power transmitting deice.Inlet 18 extends through shell 16, thereby oil groove 22 interconnection of pumping fluid are treated in low pressure oilhole 20 and storage.The outlet 24 of shell 16 is with high-pressure chamber 26 and power transmitting deice 12 interconnection.
Pump 14 comprises the pump rotor 28 that is rotatably installed in the rotor chamber 32.Live axle 34 is parts of power transmitting deice 12, and is fixed so that with pump rotor 28 rotations, thereby is provided for the energy of pumping oiling agent.A plurality of pump blades 36 are attached to rotor 28 and can radially slide with respect to rotor 28.The radial outer end of each blade 36 engages with the internal surface 38 of slide block 40.A plurality of pump chambers 44 are limited in internal surface 38, pump rotor 28 and blade 36.
Slide block 40 comprises the first arm 46, and this first arm is positioned at slidably and is formed in the depression of first in the shell 16 48.Slide block 40 also comprises second arm 50, and this second arm 50 is positioned in second depression 52 slidably.Slide block 40 also wraps substantially parallel relative wall 54,56, and wall 54,56 is positioned adjacent to the wall 58,60 of shell 16 respectively.Based on above-mentioned geometrical construction, slide block 40 can be linear mobile between first and second positions, but be constrained to not rotating with respect to shell 16.
The internal surface 38 of slide block 40 has circular cross-sectional shape.The outer surface 61 of rotor 28 also has circular cross-sectional shape.The center line of cylindrical surface 38 is located with respect to the center of outer surface 61 prejudicially.Therefore, the volume of each pump chambers 44 changes along with the rotation of rotor 28.The volume of chamber 44 increases in the low voltage side of pump, and this low voltage side is communicated with inlet 18.The size of pump chambers 44 reduces in the high pressure side, and this high pressure side is communicated with the outlet 24 of pump 14.The variation of the volume of pump chambers 44 is through producing pump action from oil groove 22 extraction operation liquid, and carries pressurized liquids from exporting 24.
The output of pump 14 can change through moving slider 40.Particularly, when slide block 40 was in primary importance as shown in Figure 1, the offset between the internal surface 38 of slide block 40 and the outer surface 61 of rotor 28 was maximum.In this position, POF is maximum.When slide block 40 was in the second place, the output of offset and pump 14 was minimum, and possibly be zero.
Linear activated assembly 62 is attached to second arm 50, and can operate so that slide block 40 moves to primary importance, the second place and any position therebetween along axle 63.Therefore, pump 14 can be controlled to export the hydrodynamic pressure of the delivery pressure that is selected from the continuous variable scope, and this delivery pressure is independent of the service speed of pump.
Be the size of the active force that reduces to be provided by actuating assembly 62, pressure balance chamber 64 is around the part of slide block 40.Pressure balance chamber 64 be communicated with from exporting the 24 pressure fluid fluids that provide.The shape of pressure balance chamber 64 and position be the active force of balanced action on slide block 40 effectively, thereby make moving slider 40 and to change the required active force of pump output minimum.Pressure balance chamber 64 extends along a side of slide block 40 at the opposite side that intersects vertically with axle 63 and extend through the straight line of surface 38 center line.It should be noted that pressure balance is arranged can expect, but is not the essential part of pumping system 10.Do not have the pressure balance chamber, actuator 62 can act on, but will serve as the input action power that the provides bigger task with moving slider 40.
Shown in Fig. 2 and 3, actuating assembly 62 comprises electric stepper motor 70, and this electric stepper motor 70 comprises the stator 72 and rotor 74 that is supported in the shell 75.Rotor 74 is attached to nut 76, this nut 76 with have externally threaded actuator shaft 78 threaded joint.Shell 75 comprises the flange 79 that is attached to pump casing 16.Replacedly, flange 79 can be fixed to power transmitting deice 12.
Fig. 3 describes actuator shaft 78, and this actuator shaft 78 comprises far-end 80, and this far-end is attached to second arm 50 through clamp member 82.Actuator shaft 78 comprises groove 84, and this groove is admitted the half-round 86 of clamp member 82.Clamp member 82 also comprises elongated top 88, and this elongated top can move in the slit 90 that is formed in second arm 50, so that actuator shaft 78 is attached to slide block 40.
With reference to Fig. 4, actuating assembly 62 is communicated with controller 100, power supply 102 and driver 104.Controller 100 can use one or more such algorithms to be programmed, and this algorithm makes controller can use the flow like the open-loop control system control pump of describing among Fig. 4 with reference to the mapping graph of speed, pressure, flow or temperature.Fig. 5 describes a closed loop control system, and this closed loop control system comprises the pressure transducer 106 that is communicated with controller 100.
In operation, live axle 34 begins rotation and starts rotor 28.Lubricant pressure and flow begin to increase at outlet 24 places.When starting, controller 100 makes slide block 40 be arranged in primary importance, so that peak rate of flow to be provided.Like this, flow increases along with the speed of live axle 34 is linear.At a certain specific speed, will be by the flow that pump 14 produces above the lubrication needs of power transmitting deice 12.Carve at this moment, controller 100 provides signal for driver 104.Driver 104 is accepted electric power from power supply 102.Driver 104 produces electrical pulse, and pulse is supplied to electric stepper motor 70, makes nut 76 along one or two direction rotation, so that signal extension or contraction that actuator shaft 78 is sent according to controller 100.Because actuator shaft 78 is attached directly to slide block 40, so the eccentricity of the linear motion change pump of actuator shaft 78 and slide block 40, thereby POF changed.
When implementing the open-loop control system of Fig. 4, controller 100 continues with signal indication driver 104, based on speed, pressure, flow or the temperature map figure positioning sliding block 40 of control algorithm.The special pressure sensor that need not be associated with pump 14.Replacedly, the closed loop feedback system of describing among Fig. 5 comprises pressure transducer 106, the signal that the pressure that this pressure transducer provides indication pump 14 for controller 100 is exported.Controller 100 gives driver 104 output signals with positioning sliding block 40 and make the lubricant pressure of pump 14 output expectations.
Described convenience actuator housings 75 has been mounted to the connection technique that pump casing 16 perhaps is mounted to another part of power transmitting deice 12 with carinate mode.This connection allows actuator shaft 78 linearities to move and force transmission is given can linearly moving slide block 40.It should be noted that any amount of method that actuator shaft 78 is fixed to slide block 40 all is considered within the scope of the present disclosure, these methods are for example for lock is fixed, riveted joint, welding, press fit, adhesive bond etc.In addition, be communicated with, it should be noted that and also can implement any amount of other sensor be provided for for controller 100 to relate to the data of the controlling decision of actuator 62 and pumping system 10 though closed loop control system is illustrated as with pressure transducer in front.
Fig. 6 and 7 describes interchangeable variable-displacement pump, and this pump indicates with label 150.Pump 150 is substantially similar to pump 14.Therefore, similar components will keep its above-mentioned reference label, additional apostrophe " ' ".Pump 150 is different from pump 14 parts and is: slide block 40 ' oppressed is towards first or the maximum eccentric position.An end of pressure spring 152 is positioned in the pit 154 that is formed at slide block 40 ' interior.The opposite end of spring 152 be positioned at be formed at shell 16 ' in depression 156 in.Spring 152 is under the compressive state continuously, with promote towards primary importance slide block 40 '.
Through this layout, actuator 62 ' no longer need towards primary importance moving slider 40 '.Actuator 62 ' apply active force so as towards second place moving slider 40 '.Like this, ABAP Adapter 158 can be fixed to actuator shaft 78 '.ABAP Adapter 158 comprises end face 160, this end face be formed at slide block 40 ' on step 162 contact.Because the active force that pressure spring 152 provides, end face 160 keeps in touch with step 162 each other.First or the maximum eccentric position, step 162 compelled be formed at shell 16 ' on 164 contact.
During pump operated, can optionally activate actuator 62 ' so that actuator shaft 78 ' extend and make slide block 40 ' move towards the second place from primary importance.In case no longer give actuator 62 ' supply of electrical energy, then because stepper motor 70 ' internal structure, slide block 40 ' the position will be held.For making slide block 40 ' move, activate actuator 62 ' once more to allow slide block 40 ' mobile under the active force that spring 152 provides towards primary importance.Can as preceding discuss pass through control actuator 62 ' and in the primary importance that peak rate of flow is provided with provide and obtain unlimited many positions between the second place of minimum discharge.
In addition, aforementioned discussion only discloses and describes exemplary embodiment of the present disclosure.Those skilled in the art will recognize from this discussion and from accompanying drawing and claims easily, can obtain different changes, modification and modification therein and do not deviate from the purport and the scope of the content that limits in following claims.

Claims (22)

1. liquid pump system that is used for power transmitting deice, it comprises:
Variable displacement vane pump, it has and comprises rotor, a plurality of blade and shell that can linearly moving slide block, and said a plurality of blades are attached to said rotor, saidly can be used to change said pump delivery by linearly moving slide block; With
Control system; The fluid output pressure that it is used to change said pump delivery and the delivery pressure that is selected from the continuous variable scope is provided; The delivery pressure of said continuous variable scope is independent of the service speed of said pump, and said control system comprises linear actuators, and said linear actuators is used to make said slide block between minimum and maximum pump displacement position, to slide; Said linear actuators comprises electric stepper motor, and said electric stepper motor is used for the actuator shaft of two-way migration on said slide block.
2. liquid pump system as claimed in claim 1; Wherein, said shell comprises the pressure balance chamber, and said pressure balance chamber is communicated with said slide block and admits pressurized working fluid; The fluid balance active force acts on the said slide block, wherein acts on making a concerted effort near zero on the slide block.
3. liquid pump system as claimed in claim 2, wherein, said control system comprises controller, and said controller is communicated with driver, and said driver provides electrical pulse for said stepper motor.
4. liquid pump system as claimed in claim 1; Wherein, Said slide block comprises the first arm; Said the first arm has substantially parallel relative face, said substantially parallel relative face be positioned at the depression that is formed in the said shell substantially parallel relative wall near, said the first arm limits the relative rotation between said slide block and the said shell.
5. liquid pump system as claimed in claim 4; Wherein, Said slide block comprises second arm, and said second arm has substantially parallel relative face, said substantially parallel relative face be positioned at another depression that is formed in the said shell substantially parallel relative wall near; Said second arm limits the relative rotation between said slide block and the said shell, and wherein said the first arm is relative along diametric(al) each other with said second arm.
6. liquid pump system as claimed in claim 5, wherein, said second arm comprises the pit of admitting said actuator shaft.
7. liquid pump system as claimed in claim 6 also comprises making said actuator shaft and the interconnected clamp member of said second arm.
8. liquid pump system as claimed in claim 2; Wherein, Said slide block comprises the hole of admitting said blade; And said pressure balance chamber extends along a side of said slide block, extends through on the part of relative both sides of center line in hole of said slide block to allow fluid to act on being positioned at of said slide block.
9. liquid pump system as claimed in claim 1, wherein, said actuator shaft and said slide block all move in parallel with each other.
10. liquid pump system as claimed in claim 9, wherein, said slide block comprises the hole of admitting said blade, the center line in the portable cord of said actuator shaft and the hole of said slide block intersects.
11. liquid pump system as claimed in claim 1 also comprises spring, said spring is oppressed said slide block, and said slide block is contacted with said actuator shaft, and wherein, said actuator shaft is not fixed to said slide block.
12. a liquid pump system that is used for power transmitting deice, it comprises:
Variable displacement vane pump, it comprises can linearly moving slide block, saidly can be used to change said pump delivery by linearly moving slide block;
Linear actuators; It is used to make said slide block between minimum and maximum pump displacement position, to move; Said linear actuators comprises electric motor; Said electric motor is used for rotary driving part, and said driver part engages driven actuator shaft, and linearity moves so that said actuator shaft responds the rotation of said driver part; With
Control system, it comprises controller, said controller signals to said actuator, changes pump displacement so that extend or shrink said actuator shaft.
13. liquid pump system as claimed in claim 12, wherein, said controller is operated under open loop control mode, and does not accept to indicate the signal by the pressure of said pump output.
14. liquid pump system as claimed in claim 12, wherein, said controller response indication operation under closed loop mode by the signal of the pressure of said pump output.
15. liquid pump system as claimed in claim 12, wherein, said electric motor is a stepper motor, and said stepper motor can be operated said slide block is positioned at each position between minimum and the displacement.
16. liquid pump system as claimed in claim 12; Wherein, Said pump comprises the shell with pressure balance chamber; Said pressure balance chamber is communicated with said slide block and admits pressurized working fluid, and said fluid balance active force acts on the said slide block, wherein acts on making a concerted effort near zero on the said slide block.
17. liquid pump system as claimed in claim 16; Wherein, Said slide block comprises the first arm; Said the first arm has substantially parallel relative face, said substantially parallel relative face be positioned at the depression that is formed in the said shell substantially parallel relative wall near, said the first arm limits the relative rotation between said slide block and the said shell.
18. liquid pump system as claimed in claim 17; Wherein, Said slide block comprises second arm, and said second arm has substantially parallel relative face, said substantially parallel relative face be positioned at another depression that is formed in the said shell substantially parallel relative wall near; Said second arm limits the relative rotation between said slide block and the said shell, and the wherein said the first arm and second arm are relative along diametric(al) each other.
19. liquid pump system as claimed in claim 18, wherein, said second arm comprises the pit of admitting said actuator shaft.
20. liquid pump system as claimed in claim 19 also comprises making said actuator shaft and the interconnected clamp member of said second arm.
21. liquid pump system as claimed in claim 12 also comprises spring, said spring is oppressed said slide block, and said slide block is contacted with said actuator shaft, and wherein, said actuator shaft is not fixed to said slide block.
22. liquid pump system as claimed in claim 12, wherein, said actuator shaft all moves along identical line with said slide block.
CN201080009310XA 2009-03-05 2010-02-23 Direct control linear variable displacement vane pump Pending CN102333956A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US15760109P 2009-03-05 2009-03-05
US61/157,601 2009-03-05
PCT/CA2010/000269 WO2010099599A1 (en) 2009-03-05 2010-02-23 Direct control linear variable displacement vane pump

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CN102333956A true CN102333956A (en) 2012-01-25

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US (1) US20120093672A1 (en)
EP (1) EP2404062A4 (en)
JP (1) JP2012519253A (en)
KR (1) KR20120006977A (en)
CN (1) CN102333956A (en)
BR (1) BRPI1010521A2 (en)
CA (1) CA2753511A1 (en)
WO (1) WO2010099599A1 (en)

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KR20120006977A (en) 2012-01-19
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EP2404062A4 (en) 2014-01-15
US20120093672A1 (en) 2012-04-19

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