CN108412760A - The adjusting method and variable pump of variable pumpage - Google Patents

The adjusting method and variable pump of variable pumpage Download PDF

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Publication number
CN108412760A
CN108412760A CN201810335548.XA CN201810335548A CN108412760A CN 108412760 A CN108412760 A CN 108412760A CN 201810335548 A CN201810335548 A CN 201810335548A CN 108412760 A CN108412760 A CN 108412760A
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China
Prior art keywords
driving
stator sleeve
pressure
eccentricity
rotor core
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CN201810335548.XA
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CN108412760B (en
Inventor
王长健
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Hangzhou Zhonghe Smart City Technology Co., Ltd.
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王长健
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/22Control 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

Abstract

The invention discloses a kind of adjusting method and variable pump of variable pumpage, adjusting method includes:The actual pressure of system pipeline in hydraulic system where obtaining variable pump;Actual pressure is set to be compared with the specified operating pressure of hydraulic system;When actual pressure is more than operating pressure, stator sleeve is set to be moved towards the direction that eccentricity reduces using driving mechanism driving stator sleeve.When actual pressure is less than operating pressure, stator sleeve is set to be moved towards the direction that eccentricity becomes larger using driving mechanism driving stator sleeve;Wherein:Eccentricity is the distance between the center of circle in the center of circle and rotor core of stator sleeve.The adjusting method and variable pump of the variable pump of the present invention are not only able to meet demand of the action variation of executive component to hydraulic oil, and can more safeguard the stabilization of hydraulic system pressure, and have protective effect to executive component and control element.

Description

The adjusting method and variable pump of variable pumpage
Technical field
The present invention relates to technical field of engineering machinery, more particularly to a kind of the adjusting method and variable pump of variable pumpage.
Background technology
Engineering machinery would generally be using hydraulic system as apparatus for work power, for example, the pivot large arm of excavator, booth Running gear of paving machine etc. provides power by hydraulic system.
It is known to, hydraulic system would generally include dynamical element (such as hydraulic pump), (such as reversal valve overflows control element Flow valve etc.) and executive component (such as hydraulic cylinder, motor).Dynamical element is for providing hydraulic oil, and control element is for controlling The pressure of hydraulic oil and the flow direction of hydraulic oil etc., executive component are used to convert the kinetic energy of hydraulic oil to mechanical kinetic energy to drive Dynamic apparatus for work.
To meet operating mode needs, technical staff will be arranged to as the hydraulic pump of dynamical element can be with the knot of Displacement Regulation Structure, changes the flow of the hydraulic oil of supply executive component by Displacement Regulation, and the change of the flow can also influence entirely indirectly The pressure of hydraulic system.
Hydraulic pump would generally include shell, the stator sleeve being set in shell and the interior and and stator sleeve positioned at stator sleeve The rotor core of eccentric setting, circumferentially multiple plungers on rotor core, when rotor core rotates, multiple plunger pumps are by stator The inside alternation of set squeezes, and to make plunger realize, oil suction and oil extraction effect, the oil extraction act as whole system and provide hydraulic pressure Oil.Accordingly, variable pump in the prior art usually changes hydraulic pump using the eccentricity for changing stator sleeve and rotor core Discharge capacity (that is, oil drain quantity of plunger).
Changing the method for the discharge capacity of hydraulic pump in the prior art is:
The flow of the hydraulic oil in the exit of hydraulic pump is obtained using flowmeter, then, is utilized according to the flow of hydraulic pump Driving part adjusts the eccentricity in hydraulic pump between stator sleeve and rotor core, and the specific adjusting method of eccentricity is: Straight-line displacement is generated in one direction using driving part driving stator sleeve, that is, the motion process of stator sleeve is always a straight line It is mobile.
There are following defects for the adjusting method of hydraulic system in the prior art, variable pump and variable pump:
1, variable pump in the prior art is according to the flow-rate adjustment eccentricity and discharge capacity in its exit so that after adjusting Variable pump can not provide accurate flow for hydraulic system.
2, displacement caused by stator sleeve contributes to eccentricity, that is to say, that the displacement variable of stator sleeve is equal to inclined The heart away from variation variable quantity, accordingly, if driving part driven by being contacted between stator sleeve stator sleeve generate displacement, (so-called drive displacement actually refers to driving part so that stator sleeve is moved to the driving force and drive displacement of driving part The variable of the displacement of designated position, the displacement and eccentricity that drive displacement is generated with stator sleeve production is equal) it needs precisely Eccentricity can accurately be adjusted, however, driving part in the prior art is mostly drive cylinder or driving piston 42, the driving The dynamic accuracy and displacement accuracy of component are inaccurate, so that variable pump utilizes above-mentioned adjusting method and driving part Eccentricity can not accurately be adjusted.
3, service life of the above-mentioned discharge capacity adjusting method of variable pump in the prior art for the control element of such as overflow valve And hydraulic system reliability and noise control it is unfavorable.
Invention content
For the above-mentioned technical problems in the prior art, the embodiment provides a kind of variable pumpages Adjusting method and variable pump.
In order to solve the above technical problems, the embodiment of the present invention the technical solution adopted is that:
A kind of adjusting method of variable pumpage, the variable pump includes shell, the stator that is set in the shell The rotor core cover, being set in the stator sleeve, the multiple plungers and the driving mechanism that are arranged circumferentially on the rotor core, The adjusting method includes:
The actual pressure of system pipeline in hydraulic system where obtaining the variable pump;
The actual pressure is set to be compared with the specified operating pressure of the hydraulic system;When the actual pressure When more than the operating pressure, the stator sleeve is set to be moved towards the direction that eccentricity reduces using driving mechanism driving stator sleeve. When the actual pressure is less than the operating pressure, make the stator sleeve towards eccentricity using driving mechanism driving stator sleeve The direction movement to become larger;Wherein:
The eccentricity is the distance between the center of circle in the center of circle and the rotor core of the stator sleeve.
Preferably,
When the actual pressure is more than the operating pressure and the difference of the actual pressure and the operating pressure When poor less than preset pressure, drive the stator sleeve towards the of the axis perpendicular to the rotor core using the driving mechanism One direction moves linearly to reduce the eccentricity;When the actual pressure is less than the operating pressure and the operating pressure And when the difference of the actual pressure is less than preset pressure difference, drive the stator sleeve towards perpendicular to institute using the driving mechanism The negative direction for stating the first direction of the axis of rotor core moves linearly to increase the eccentricity;
It is more than when the actual pressure is less than the operating pressure and the difference of the operating pressure and the actual pressure value When preset pressure difference, drive the stator sleeve towards the first party of the axis perpendicular to the rotor core using the driving mechanism To after linear movement, drive the stator sleeve towards the second direction perpendicular to the rotor core axis using the driving mechanism Movement, finally to increase the eccentricity;When the actual pressure be more than the operating pressure and the actual pressure with it is described When the difference of operating pressure is more than preset pressure difference, drive the stator sleeve towards perpendicular to the rotor using the driving mechanism After the negative direction linear movement of the first direction of the axis of core, using the driving mechanism drive the stator sleeve towards perpendicular to The second direction of the rotor core axis moves or the movement of the negative direction of second direction, finally to reduce the eccentricity; Wherein:
Before the stator sleeve is moved towards first direction, when the eccentricity between the rotor core and the stator sleeve is 0 When, the first direction is the arbitrary radial direction by the center of circle of the rotor core;When the rotor core and the stator sleeve Between eccentricity be it is non-zero when, the first direction is determined by the line in the center of circle of the rotor core and the center of circle of stator sleeve Direction;
The first direction and the angle of the second direction are more than 0 ° and are less than 90 °.
Preferably, the second direction is the moving direction different from the first direction.
Preferably, the stator sleeve is directly rotatably or is indirectly connected to the stator sleeve;The second direction For the rotation direction different from the first direction.
Preferably, the driving mechanism includes the first driving portion and the second driving portion;First driving portion is for driving The stator sleeve is moved towards first direction;Second driving portion is for driving the stator sleeve to be rotated towards the second direction.
The invention also discloses a kind of variable pump, the variable pump is constructed based on above-mentioned adjusting method.
Compared with prior art, the adjusting method of variable pumpage disclosed by the invention and the advantageous effect of variable pump are: The adjusting method and variable pump of the variable pump of the present invention are not only able to meet need of the action variation to hydraulic oil of executive component It asks, and can more safeguard the stabilization of hydraulic system pressure, and there is protective effect to executive component and control element.
Description of the drawings
Simple view (the variable pump for the variable pump that Fig. 1 is constructed for the adjusting method of the variable pumpage based on the present invention The state for being 0 in eccentricity).
Simple view (the variable pump for the variable pump that Fig. 2 is constructed for the adjusting method of the variable pumpage based on the present invention In the state that eccentricity is e0).
Simple view (the variable pump for the variable pump that Fig. 3 is constructed for the adjusting method of the variable pumpage based on the present invention In the state that eccentricity is es).
Simple view (the variable pump for the variable pump that Fig. 4 is constructed for the adjusting method of the variable pumpage based on the present invention In the state that eccentricity is en, wherein second direction is the moving direction perpendicular to first direction).
Simple view (the variable pump for the variable pump that Fig. 5 is constructed for the adjusting method of the variable pumpage based on the present invention In the state that eccentricity is en, wherein second direction is the rotation direction perpendicular to first direction).
Fig. 6 is the topology view of variable pump provided by the present invention (variable pump is in the state that eccentricity is 0).
Fig. 7 is the partial enlarged view of the A of Fig. 6.
Fig. 8 is the partial enlarged view of the B of Fig. 6.
Fig. 9 is the topology view of variable pump provided by the present invention (variable pump is in the state that eccentricity is e0).
Figure 10 is the partial enlarged view of the C of Fig. 9.
Figure 11 is the partial enlarged view of the D of Fig. 9.
Figure 12 is the topology view of variable pump provided by the present invention (variable pump is in the state that eccentricity is es).
Figure 13 is the partial enlarged view of the E of Figure 12.
Figure 14 is the partial enlarged view of the F of Figure 12.
Figure 15 is the topology view of variable pump provided by the present invention (variable pump is in the state that eccentricity is en).
Figure 16 is the partial enlarged view of the G of Figure 15.
Figure 17 is the partial enlarged view of the H of Figure 15.
Figure 18 is the partial enlarged view of the I of Figure 15.
In figure:
10- shells;20- stator sleeves;21- the first sliding grooves;22- second sliding slots;The articulated sections 23-;24- third sliding slots;25- Recess;30- rotor cores;31- plungers;32- piston shoes;The first driving portions of 40-;41- the first balance groups;The first dummy pistons of 411-; 4111- protrusions;412- second springs;413- buckle closures 413;414- adjusting screws;415- locknuts 415;42- drives piston 42; The first springs of 43- 43;44- axis pins 44;The second driving portions of 50- 50;51- the second balance groups;511- head covers;Shell is kept on 512-; 513- third springs;The second bushings of 514-;The second dummy pistons of 515-;The second piston shoes of 516-;52- deformable bodys;53- electromagnetism Body;54- driving bodies;The first glands of 541-;The first piston shoes of 55-;56- adjustment is female;57- fixing bodies;Shell is kept under 571-;58- One bushing;The 4th springs of 59-;60- controls valve member.
Specific implementation mode
To make those skilled in the art be better understood from technical scheme of the present invention, below in conjunction with the accompanying drawings and it is embodied Mode elaborates to the present invention.
Embodiment of the invention discloses that a kind of adjusting method of variable pumpage, the adjusting method make the row of variable pump Amount disclosure satisfy that demand of the hydraulic system to hydraulic oil, it is especially useful in meet in hydraulic system executive component (e.g., hydraulic cylinder, Hydraulic motor) action variation caused by demand to hydraulic oil change so that the apparatus for work of engineering machinery can be into Action is made to change.For example, when hydraulic system is sent out because of the change of hydraulic actuator (such as hydraulic cylinder, hydraulic motor) operating mode When raw movement speed variation is to cause demand of the hydraulic system to hydraulic oil to generate variation, adjusting side provided by the invention is utilized Method enables to the discharge capacity of variable pump to meet the needs of hydraulic system is to hydraulic oil.That is, the adjusting method of the present invention It is to meet the needs of hydraulic system is to hydraulic oil by changing the discharge capacity of variable pump, rather than change according to external impetus and become The rotating speed of pump is measured to meet the needs of hydraulic system is to hydraulic oil.The adjusting method of the offer of the present invention is specific as follows:
Before introducing adjusting method, the composition of variable pump is first introduced.As shown in Fig. 1 to 5, variable pump includes shell 10, sets The stator sleeve 20 that is placed in shell 10, the rotor core 30 being set in stator sleeve 20, be arranged circumferentially in it is multiple on rotor core 30 Plunger 31 and driving mechanism, wherein stator sleeve 20 with rotor core 30 there is eccentricity external impetus to be made to drive rotor core When 30 rotation, plunger 31 carries out alternation and stretches out compression, to make variable pump absorption and discharge hydraulic oil to be supplied to hydraulic pressure system System, eccentricity is bigger, and the flow for the hydraulic oil that variable pump is discharged is bigger (that is, the discharge capacity of variable pump is bigger), and eccentricity is got over Small, the flow of this hydraulic oil being discharged of variable is smaller.
The adjusting method of variable pumpage of the present invention includes:
The actual pressure of system pipeline in hydraulic system where obtaining variable pump.In this step, available be connected to is The device for pressure measurement (e.g., pressure sensor and pressure gauge) with signal output function of road under the overall leadership carrys out measuring system pipe The actual pressure (namely actual pressure of hydraulic system) of hydraulic oil in road.
Making the specified operating pressure of actual pressure and hydraulic system, (the specified operating pressure is to ensure hydraulic system The pressure of each element normal work) it is compared;When actual pressure is more than operating pressure, stator is driven using driving mechanism Stator sleeve 20 is made to be moved towards the direction that eccentricity reduces for set 20 so that the discharge capacity of variable pump reduces, and then actual pressure is made to adjust To operating pressure or operating pressure;When actual pressure is less than operating pressure, stator sleeve 20 is driven using driving mechanism Stator sleeve 20 is set to be moved towards the direction that eccentricity becomes larger so that the discharge capacity of variable pump increases and then actual pressure is made to be adjusted to work Near pressure or operating pressure;Eccentricity is the distance between the center of circle in the center of circle and rotor core 30 of stator sleeve 20.At this In step, actual pressure is set to be compared with operating pressure using the processor being electrically connected with device for pressure measurement, for example, It is pre-stored the pressure value of the operating pressure of hydraulic system in the processor, then, by processor to from device for pressure measurement institute The pressure value for obtaining actual pressure is compared with the pressure value of operating pressure, then, recycles the control being electrically connected with processor Device processed controls driving mechanism, so that driving mechanism driving stator sleeve 20 moves.In the present embodiment, driving mechanism can be machine Tool driving mechanism (e.g., nut and screw mechanism), hydraulic drive mechanism (e.g., hydraulic cylinder) or electromagnetic drive mechanism (electromagnet With magnetopause bar).
The advantage of the adjusting method of above-mentioned variable pumpage disclosed in this invention is:
The discharge capacity that the present invention is pumped according to the actual pressure in hydraulic system come regulated variable, so that discharge capacity after the adjustment It is attached that the hydraulic oil that variable pump afterwards is discharged can make the pressure of the hydraulic system where it maintain specified operating pressure Closely, the discharge capacity adjusting method of this variable pump not only meets demand of the executive component to the flow of hydraulic oil, and makes execution Control element in element and hydraulic system can work normally under operating pressure, after Displacement Regulation Variable pump discharge capacity because so that damage to executive component and control element caused by the hypertonia of hydraulic system, and it is same When avoid because pressure is low cannot meet executive component realization action requirement.
It should be noted that:It has been found that whether the discharge capacity of judgment variable pump meets the needs of hydraulic system, it is practical On be that whether the discharge capacity of judgment variable pump meets the requirement of executive component movement speed, and whether the discharge capacity of judgment variable pump full The requirement of sufficient executive component movement speed can be known by the actual pressure of the hydraulic oil in measuring system pipeline, work as reality Border pressure compares operating pressure hour, and the discharge capacity of explanatory variable pump is smaller to provide enough liquid for the action of executive component Pressure oil, it is therefore desirable to increase the discharge capacity of variable pump, and when actual pressure is more than working hydraulic pressure, explanatory variable pump is supplied to liquid The oil of pressure system is excessive, and executive component does not need to so many hydraulic oil.
The present invention adjusting method compared with the prior art in by measurand pump outlet hydraulic oil flow, The actual needs flow for making the flow and being calculated is compared to the method for the discharge capacity that regulated variable pumps (in the prior art Method do not consider the pressure condition of entire hydraulic system, this can cause the discharge capacity when variable pump although to meet execution The demand of element movement, but entire hydraulic system pressure is excessively high, causes whole system unstable, and be easy to such as overflow valve etc. Control element damages), adjusting method of the invention can more safeguard the stabilization of hydraulic system pressure, and to executive component And control element has protective effect.
A kind of adjusting method of more preferably variable pumpage is proposed in a preferred embodiment of the invention, it should Method synthesis adjusts the discharge capacity of variable pump according to actual pressure and operating pressure comparison result and the two pressure difference value Section.Specifically, when actual pressure is more than operating pressure and the difference of actual pressure and operating pressure is less than preset pressure difference, profit The first direction for driving stator sleeve 20 towards the axis perpendicular to rotor core 30 with driving mechanism moves linearly to reduce eccentricity; When actual pressure is less than operating pressure and operating pressure and the difference of actual pressure are less than preset pressure difference, driving mechanism is utilized The negative direction for driving stator sleeve 20 towards the first direction of the axis perpendicular to rotor core 30 moves linearly to increase eccentricity;When When actual pressure is less than operating pressure and the difference of operating pressure and actual pressure value more than preset pressure difference, as shown in figure 3, sharp After the first direction for driving stator sleeve 20 towards the axis perpendicular to rotor core 30 with driving mechanism moves linearly, such as Fig. 4 and Fig. 5 It is shown, drive stator sleeve 20 towards the second direction movement perpendicular to 30 axis of rotor core using driving mechanism, finally to increase partially The heart away from;When actual pressure is more than operating pressure and the difference of actual pressure and operating pressure is more than preset pressure difference, driving is utilized After the negative direction that mechanism drives stator sleeve 20 towards the first direction of the axis perpendicular to rotor core 30 moves linearly, driving is utilized The negative direction that mechanism drives stator sleeve 20 towards second direction movement or second direction perpendicular to 30 axis of rotor core moves, Finally to reduce eccentricity;Wherein:Before stator sleeve 20 is moved towards first direction, when between rotor core 30 and stator sleeve 20 When eccentricity is 0, first direction is the arbitrary radial direction by the center of circle of rotor core 30;When rotor core 30 and stator sleeve 20 Between eccentricity when being non-zero, first direction is side determined by the line in the center of circle of the center of circle and the stator sleeve 20 of rotor core 30 To;First direction and the angle of second direction are more than 0 ° and are less than 90 °.
Above-described embodiment proposes a kind of more specific and preferably adjusting method, this method are directed to actual pressure and work The degree that pressure is deviateed takes eccentricity different adjustings, to realize the adjusting to the discharge capacity of variable pump.
The adjusting method that above-described embodiment is provided specifically can be regarded as:When the pressure between actual pressure and operating pressure When force difference is smaller (size of pressure difference is judged based on preset pressure difference), that is, the degree that actual pressure deviates operating pressure is smaller When, only stator sleeve 20 need to be driven to move in a first direction using driving mechanism and so that eccentricity is met required for variable pump and adjust Discharge capacity;And when the pressure difference between actual pressure and operating pressure is larger, that is, actual pressure deviates operating pressure Degree it is larger when, as shown in figure 3, driving stator sleeve 20 towards moving linearly on first direction first using driving mechanism, so Afterwards, as shown in Figure 4 and Figure 5, driving mechanism is recycled to be moved towards second direction, to make final eccentricity meet variable pump The discharge capacity of required adjusting.Wherein, preset pressure difference is set according to operating pressure, and generally 1/10th of operating pressure are left It is right.
The advantage for the adjusting method that above-described embodiment is provided is:
When the degree that actual pressure deviates operating pressure is smaller, the adjusting sensitivity of the discharge capacity of variable pump is key point, At this point, eccentricity can be made quickly to be adjusted to the row needed for variable pump by driving stator sleeve 20 to move in one direction Amount, to make actual pressure quickly be adjusted to operating pressure, to reach sensitive effect.
When the degree that actual pressure deviates operating pressure is larger, the degree of regulation of the discharge capacity of variable pump becomes key point, At this point, making eccentricity quickly be adjusted to one relatively most by driving stator sleeve 20 to move linearly in a first direction The intermediate eccentric distance e s of whole eccentricity carries out a coarse adjustment, accordingly, the discharge capacity of variable pump to realize to eccentricity Accordingly coarse adjustment is carried out;After completing the coarse adjustment to eccentricity, by driving stator sleeve 20 to move in a second direction, So that eccentricity is completed an accurate adjustment section after adjusting twice, makes the discharge capacity of variable pump to obtain final eccentric distance e n Accurately meets very much the needs of system is to flow.
When actual pressure deviate operating pressure degree it is larger when, by priority both direction drive stator sleeve 20 with The advantage for adjusting eccentricity is:When driving in a first direction, the drive displacement of driving mechanism is completely used for contributing to bias Away from (that is, drive displacement is equal to the variable quantity et of eccentricity), how many drive displacement just generates the variable quantity of how many eccentricity The characteristics of et has in this way using making eccentricity quickly be adjusted, and this drive displacement all contributes to eccentricity cannot So that eccentricity realization is accurately adjusted, is merely able to carry out coarse adjustment to eccentricity, and stator sleeve 20 is on completing first direction After movement, what drive displacement (H1, H2) in a second direction only had part contributes to eccentricity, that is to say, that such as Fig. 4 and Shown in Fig. 5, the variable quantity ed of eccentricity is less than drive displacement (H1, H2) in a second direction, in this way, in second direction On the variable quantity of eccentricity of unit drive displacement contribution contributed compared to unit drive displacement in a first direction Eccentricity is much smaller, therefore, drives stator sleeve 20 that eccentricity is enable to obtain higher adjusting essence in a second direction Degree.
As described above, in above-described embodiment using both direction drive stator sleeve 20 come adjust eccentricity can Meet and adjust sensitive requirement, and meets the requirement of degree of regulation.
It should be noted that:As depicted in figs. 1 and 2, when variable pump starts from the state that eccentricity is 0 (at this point, becoming Amount pump is used as slippage pump more), original eccentricity distance e0 leads to driving mechanism and stator sleeve 20 is driven to obtain in a first direction.
Being moved in two directions using driving mechanism driving stator sleeve 20 can be by (this two driving of two driving portions Portion is as driving mechanism) it realizes, i.e. the first driving portion 40 and the second driving portion 50, first driving portion 40 is for driving stator Set 20 moves in a first direction, and the second driving portion 50 is for driving stator sleeve 20 to move in a second direction.
And the second driving portion 50 drives there are two types of the forms of motion of stator sleeve 20 in a second direction:
The first is:Driving stator sleeve 20 moves linearly in a second direction, in a preferred embodiment, such as Fig. 4 institutes Show, the second driving portion 50 moves linearly towards perpendicular to first party upwardly direction driving stator sleeve 20.
It is for second:Driving stator sleeve 20 is rotated around a center in a second direction, in a preferred embodiment In, as shown in figure 5, originally the second driving portion 50 drives stator around a center rotating towards perpendicular to first party upwardly direction. In this kind of forms of motion, stator sleeve 20 need to be made to be rotatably connected on shell 10.
As shown in Figure 4 and Figure 5, above two predetermined form can make variable quantity of the drive displacement less than eccentricity, from And illustrate that drive displacement does not contribute to eccentricity completely, and then demonstrate the movement of stator sleeve 20 in a second direction Process is the process accurately adjusted to eccentricity.
As shown in Fig. 6 to 18, the invention also discloses a kind of variable pump, the variable pump include shell 10, stator sleeve 20, Rotor core 30, multiple plungers 31, driving mechanism.Wherein, shell 10 is that detachably separate structure, shell 10 are interior with accommodating Chamber;Stator sleeve 20 is set in accommodating cavity and can be moved in accommodating cavity, and the receiving space of accommodating cavity is more than stator sleeve 20, So that stator sleeve 20 can have certain movement surplus in accommodating cavity, in the present embodiment, the inner wall of accommodating cavity is by two Lunette and the planar wall for connecting two lunettes surround;Rotor core 30 is set in stator sleeve 20, the rotor core 30 tool There is one end of axially extended shell 10, which connect with external impetus component, for example, be directly connected to external drive motors, or Person is connect by gearbox with external drive motors, and the power part is for driving rotor core 30 to rotate;Multiple plungers 31 are circumferential Be arranged in around rotor core 30, one end of the plunger 31 is hinged with rotor core 30, and the inner wall of the other end and stator sleeve 20 is slided Dynamic connection, when rotor core 30 rotates, multiple plungers 31 are rotated with rotor core 30 simultaneously, when stator sleeve 20 and rotor core 30 have When certain eccentricity (so-called eccentricity is the distance between the center of circle of stator sleeve 20 and rotor core 30), multiple plungers 31 with Rotor core 30 rotates and carries out alternation stretching or compression (oil drain quantity of multiple plungers 31 is to become to carry out oil suction and oil extraction Measure the discharge capacity of pump), the oil being discharged is used to supply the hydraulic system where variable pump, and changes column by changing eccentricity The alternation of 31 pump of plug stretches out and decrement is to change the discharge capacity of variable pump;Driving mechanism is driven including the first driving portion 40 and second Dynamic portion 50, the first driving portion 40 generate drive displacement by itself component and stator sleeve 20 are driven to move linearly in a first direction; Second driving portion 50 is used for after the first driving portion 40 completes the driving to stator sleeve 20 in a first direction, second driving portion 50 driving stator sleeves 20 towards second direction move, second direction is different from first direction in the present embodiment, and first direction with Second direction is perpendicular to the direction of the axis of rotor core 30.So-called second direction refers to first party with first direction difference To with second direction there is certain angle, the angle to be chosen as being less than 180 ° more than 0 °, also, in stator sleeve 20 towards first Before the movement of direction, when the eccentricity between rotor core 30 and stator sleeve 20 is 0, first direction is the circle by rotor core 30 The arbitrary radial direction of the heart;When the eccentricity between rotor core 30 and stator sleeve 20 is non-zero, first direction is rotor core 30 The center of circle and stator sleeve 20 the center of circle line determined by direction.
Above-mentioned variable pump can adapt to the requirement of the regulated quantity of different discharge capacities, and with adjusting high sensitivity and adjusting Advantage with high accuracy, actual pressure of the variable pump where according to it in system pipeline of hydraulic system carry out the tune of discharge capacity When section, adjust sensitivity and degree of regulation it is high advantage it is more obvious.
Above-mentioned variable pump is as follows according to the method and process of the different pressure Displacement Regulation of system pipeline:
When (actual pressure is obtained actual pressure by the device for pressure measurement being connected on system pipeline, the pressure measurement Device can be pressure sensor and pressure gauge) (making each control element, executive component just in hydraulic system more than operating pressure The pressure often to work) and the difference of actual pressure and operating pressure when being less than preset pressure difference, it is fixed to be driven using the first driving portion 40 The first direction of sub-set 20 towards the axis perpendicular to rotor core 30 moves linearly to reduce eccentricity;When actual pressure is less than work Make pressure and when operating pressure and the difference of actual pressure are less than preset pressure difference, using the first driving portion 40 so that stator sleeve 20 Negative direction towards the first direction of the axis perpendicular to rotor core 30 moves linearly to increase eccentricity;When actual pressure is less than When the difference of operating pressure and operating pressure and actual pressure value is more than preset pressure difference, as shown in figure 12, the first driving portion is utilized After the first direction of 40 driving stator sleeves 20 towards the axis perpendicular to rotor core 30 moves linearly, as shown in figure 15, second is utilized Driving portion 50 drives stator sleeve 20 towards the second direction movement perpendicular to 30 axis of rotor core, finally to increase eccentricity;Work as reality When border pressure is more than operating pressure and the difference of actual pressure and operating pressure more than preset pressure difference, the first driving portion 40 is utilized After the negative direction for driving stator sleeve 20 towards the first direction of the axis perpendicular to rotor core 30 moves linearly, the second driving is utilized 50 mechanism of portion drives stator sleeve 20 towards the negative direction of second direction movement or second direction perpendicular to 30 axis of rotor core Movement, finally to reduce eccentricity (motion process and state that are not shown in the drawings the stator sleeve 20 of this kind of situation).
The mode and process of the variable pump Displacement Regulation of above-described embodiment can be regarded as:When actual pressure and operating pressure Between pressure difference it is smaller when (size of pressure difference based on preset pressure difference judge), that is, actual pressure deviates operating pressure When degree is smaller, stator sleeve 20 need to be driven to move in a first direction using the first driving portion 40 and eccentricity is made to meet variable The discharge capacity adjusted required for pump;And when the pressure difference between actual pressure and operating pressure is larger, that is, actual pressure When the degree of deviation operating pressure is larger, as shown in figure 12, drive stator sleeve 20 towards first party first using the first driving portion 40 Then linear movement upwards as shown in figure 15, recycles the second driving portion 50 that stator sleeve 20 is driven to be moved towards second direction, To make final eccentricity meet the discharge capacity adjusted required for variable pump.Wherein, preset pressure difference is set according to operating pressure Determine, generally 1/10th or so of operating pressure.
The variable pump that above-described embodiment is provided possessed advantage in terms of Displacement Regulation is:
When the degree that actual pressure deviates operating pressure is smaller, the adjusting sensitivity of the discharge capacity of variable pump is key point, At this point, eccentricity can be made quickly to be adjusted to the row needed for variable pump by driving stator sleeve 20 to move in one direction Amount, to make actual pressure quickly be adjusted to operating pressure, to reach sensitive effect.
When the degree that actual pressure deviates operating pressure is larger, the degree of regulation of the discharge capacity of variable pump becomes key point, At this point, making eccentricity quickly be adjusted to one relatively most by driving stator sleeve 20 to move linearly in a first direction The intermediate eccentricity of whole eccentricity carries out a coarse adjustment to realize to eccentricity, accordingly, the discharge capacity of variable pump also phase Coarse adjustment should be carried out;After completing the coarse adjustment to eccentricity, by driving stator sleeve 20 to move in a second direction, make Eccentricity completes an accurate adjustment section after adjusting twice, keeps the discharge capacity of variable pump very smart to obtain final eccentricity Accurate meets the needs of system is to flow.
When the degree that actual pressure deviates operating pressure is larger, displacement pump bigger that above-described embodiment is provided it is excellent Gesture is:When driving in a first direction, the drive displacement of the first driving portion 40 is completely used for contributing to eccentricity, how many Drive displacement just generates the variable quantity of how many eccentricity, has in this way using making eccentricity quickly be adjusted, and this driving position Moving the characteristics of all contributing to eccentricity can not but be such that eccentricity realization accurately adjusts, and be merely able to carry out eccentricity thick It adjusts, and after movement of the stator sleeve 20 on completing first direction, drive displacement in a second direction only has contributing to for part Eccentricity, that is to say, that the variable quantity of eccentricity is less than drive displacement in a second direction, in this way, in a second direction Unit drive displacement contribution eccentricity variable quantity contributed compared to unit drive displacement in a first direction it is inclined The heart is away from much smaller, therefore, drives stator sleeve 20 that eccentricity is enable to obtain higher degree of regulation in a second direction.
As described above, when the variable pump of above-described embodiment offer is in applied to the larger hydraulic system of pressure oscillation, Stator sleeve 20 is driven to move in two directions by two driving portions so that it is sensitive that the adjusting of eccentricity can meet adjusting Requirement, and meet the requirement of degree of regulation.
In a preferred embodiment of the invention, as shown in Fig. 6 to Figure 18, the first driving portion 40 includes the first driving Group and the first balance group 41;Second driving portion 50 includes the second driving group and the second balance group 51;Wherein:First driving group with First balance group 41 is symmetrically installed in shell 10;Second driving group is symmetrically installed in shell 10 with the second balance group 51 In;The circumferentially position of first driving group and the circumferentially position of the second driving group are in 90 °.In the present embodiment, first Driving portion 40 and the second driving portion 50 drive the movement of stator sleeve 20 to change bias in a manner of contacting pushing and pressing with stator sleeve 20 Away from.In the present embodiment, the arrangement of the first driving portion 40 and the second driving portion 50 shows in embodiment, stator sleeve The first direction and second direction of 20 movements are perpendicular, and the first driving portion 40 and 50 advantage so arranged of the second driving portion exist In:So that the drive displacement and the ratio of the correspondingly variable quantity of eccentricity that stator sleeve 20 is obtained are maximum, to utmostly The final degree of regulation for improving eccentricity.
It should be noted that:First driving group and the first balance group 41 cooperation driving stator sleeve 20 are straight in a first direction Line moves, for example, when the force of the first driving group is more than the first balance group 41, stator sleeve 20 is driven court by the first driving group It moves linearly (as shown in figure 12) on first direction, and when the first balance group 41 force is more than the first driving group, stator sleeve 20 By the first balance drive (attached to be not shown in figure this kind of situation) is moved linearly towards the negative direction of first direction;For another example when the When the force of two driving groups is more than the second balance group 51, stator sleeve 20 is driven towards second party by the second driving group and is moved upwards (such as Shown in Figure 15), and when the second balance group 51 force is more than the second driving group, stator sleeve 20 driven by the second balance group 51 and Negative direction towards second direction moves (attached to be not shown in figure this kind of situation).
In a preferred embodiment of the invention, as shown in Fig. 6 to 18, the arranged on left and right sides of shell 10 is respectively formed with Penetrate through the left directed cavity to accommodating cavity and right directed cavity;First driving group includes being set in left directed cavity and capable of being led along a left side To chamber slide with push against the driving piston 42 of stator sleeve 20, be set in left directed cavity and with drive piston 42 abut first Spring 43;First balance group 41 includes being set in right directed cavity and capable of being slided along right directed cavity to push against stator sleeve 20 First dummy piston 411, is set between the first dummy piston 411 and buckle closure 413 buckle closure 413 being fixed on shell 10 Second spring 412 wears buckle closure 413 and for pushing against second spring 412 to adjust the adjusting screw 414 of its compression degree (after having adjusted compression degree, being locked by locknut 415).In the present embodiment, in the external setting one in the left side of shell 10 Valve member 60 is controlled, external control hydraulic oil (the control hydraulic oil may be from hydraulic system, or be provided by hydraulic oil) is logical It crosses control valve member 60 and enters left directed cavity, stator sleeve 20 is driven to control driving piston 42 by controlling the pressure of hydraulic oil Power so that driving piston 42 stator sleeve 20 can be driven to move in a first direction, when stator sleeve 20 be moved to institute it is scheduled When eccentricity, the first spring 43 and control hydraulic oil make to the active force of stator sleeve 20 and second spring 412 by the One dummy piston 411 is to the force balance of stator sleeve 20, at this point, before being not affected by otherwise active force, stator sleeve 20 It is maintained at the position after moving in a first direction, corresponding eccentricity keeps determining size.In the present embodiment, spiral shell is adjusted Nail 414 for adjusting second spring 412, with when the pressure of the control hydraulic oil in left directed cavity is minimum or left directed cavity in Control hydraulic oil is not fed and stator sleeve 20 is in (as shown in Figure 6 to 8) when so that eccentricity is 0 position, the first spring 43 reach balance (such as Fig. 6 institutes by driving piston 42 and dummy piston with second spring 412 to the active force of stator sleeve 20 Show).
In a preferred embodiment of the invention, the left side of stator sleeve 20 is provided with articulated section 23, and articulated section 23 passes through Axis pin 44 is rotationally articulated in driving piston 42.The upper and lower both sides of shell 10 are respectively formed with the upper straight slot of perforation accommodating cavity With lower straight slot.Second driving group includes lower holding shell 571, fixing body 57, electromagnet, deformable body 52, the first piston shoes 55, driving Body 54;The lower downside for keeping shell 571 to be fixed on shell 10;Fixing body 57 is fixed in lower holding shell 571, and fixing body 57 has Mounting groove and the guide groove penetrated through vertically;Electromagnet 53 includes iron core and the coil being wound on iron core, electromagnet 53 It is installed in mounting groove with the magnetic induction line of formation level;Deformable body 52 is that columned magnetic imitates memory metal, and deformable body 52 is vertical Be set in guide groove, magnetic induction line can pass through deformable body 52;Driving body 54 is set in guide groove and is located at deformable body 52 Top, after working as deformable body 52 by magnetic strength, deformable body 52 vertically increase to drive driving body 54 to move straight up;The The tail portion of one piston shoes 55 is hinged with the upper end of driving body 54, and head is arranged to the matched cylinder in the periphery of stator sleeve 20 simultaneously It is attached with stator sleeve 20 across lower straight slot;Second balance group 51 include upper holding shell 512, third spring 513, head cover 511, Second dummy piston 515 and the second piston shoes 516;The upper upside for keeping shell 512 to be fixed on shell 10, the second dummy piston 515 It being set to and keeps in shell 512, third spring 513, which is set to, keeps in shell 512 and pushes against the second dummy piston 515, and second The tail portion of piston shoes 516 is articulated on the second dummy piston 515, and head is arranged to and the matched cylinder in the periphery of stator sleeve 20 And it is attached with stator sleeve 20 across upper straight slot.Preferably, the lower section of deformable body 52 is provided with adjustment mother 56, and deformable body 52 Top also set up the 4th spring 59 for pushing against deformable body 52, the 4th spring 59 is for making deformable body 52 lose magnetic strength After effect, the distortion allowance that itself can not restore is removed.
As shown in Figure 12 to 14, after the first driving portion 40 is completed to the driving in a first direction of stator sleeve 20, to electricity Magnetic coil is powered, and electromagnet can generate the magnetic induction line that memory metal is imitated across magnetic so that magnetic imitates memory metal towards stator sleeve 20 Side it is upwardly-deformed, and then drive driving body 54 towards moving on the direction of stator sleeve 20, so pushed against by the first piston shoes 55 it is fixed Sub-set 20 rotates in a second direction, until eccentricity is made to reach final adjusting position.
It should be noted that:As shown in Figure 15 to 18, while the first piston shoes 55 driving stator sleeve 20 rotates, stator Set 20 drives the second dummy piston 515 to be moved towards the direction far from stator sleeve 20 by the second piston shoes 516, so that third Spring 513, finally so that effect of the third spring 513 by the second dummy piston 515 and the second piston shoes 516 to stator sleeve 20 Power and the first piston shoes 55 are to the force balance of stator sleeve 20, and to make stator sleeve 20, suffered power is flat in a second direction Weighing apparatus makes to be passed through so that eccentricity keeps stablizing, and when needing to make the direction counter motion in a second direction of stator sleeve 20 When the electric current of electromagnetic coil reduces, the deflection that magnetic imitates memory metal reduces, and third spring 513 passes through the second dummy piston 515 and 516 reverse push of the second piston shoes support stator sleeve 20, and so that stator sleeve 20 is moved to makes eccentricity reach the flat of expected size Weighing apparatus position.
In the above-described embodiments, it is connected on driving piston 42 by rotatable mode due to stator sleeve 20, first After driving portion 40 makes stator sleeve 20 complete linear movement in a first direction, stator sleeve 20 is enable by the second driving portion 50 Enough rotations realized in a second direction.Above-described embodiment, which makes stator sleeve 20 be connected by the way of rotationally, makes stator sleeve 20 movement in a second direction is easier to realize, and movement is made more to stablize, and improves the designability of variable pump, can add Work and assembling capacity.
The magnetic effect memory metal of above-described embodiment is advantageous in that as the power source of driving body 54:On the one hand, magnetic induction line The deflection function correspondence of intensity and magnetic effect metal be one-to-one relationship, and the electric current and electromagnetism for passing through coil The relationship of magnetic induction line intensity produced by body 53 is also one-to-one relationship, this makes electric current and the deflection of deformable body 52 have One-to-one relationship, so that displacement caused by driving body 54 is more accurate, so that driving body 54 is slided by first The position that boots 55 drive the movement of stator sleeve 20 in a second direction that can reach is more accurate, in a second direction It is more accurate to the adjusting of eccentricity;On the other hand, after magnetic effect metal is influenced by magnetic induction line, deformation sensitivity and Frequency is higher than Mechanical Driven displacement and hydraulic-driven displacement, this makes the adjusting sensitivity of eccentricity in a second direction more It is high.
In above-described embodiment stator sleeve 20 is directly driven using the first piston shoes 55 and the second piston shoes 516 in a second direction The advantage of rotation is:The head of first piston shoes 55 and the head of the second piston shoes 516 are matched with the peripheral surface of stator sleeve 20, and First piston shoes 55 are that hinged mode connects with the tail portion of the second piston shoes 516, so that turning around junction in stator sleeve 20 After dynamic certain angle, as shown in Figure 12,14,15,18, the first piston shoes 55 and the second piston shoes 516 still can be tight with stator sleeve 20 Close attaching, to improve the stability in the rotation process of stator sleeve 20 in a first direction and the stability after rotation.
In a preferred embodiment of the invention, as shown in figures 12 and 14, right in stator sleeve 20 and the first piston shoes 55 The first sliding groove 21 is offered on the periphery answered, and the slot bottom of the first sliding groove 21 is made to be processed into the higher arcwall face of surface quality, first The head of piston shoes 55 is attached at the slot bottom of the first sliding groove 21, to reduce the resistance of the first piston shoes 55 sliding;In stator sleeve 20 and Two piston shoes offer second sliding slot 22 on 516 corresponding periphery, so that the slot bottom of second sliding slot 22 is processed into surface accuracy higher The head of arcwall face, the second piston shoes 516 is attached at the slot bottom of second sliding slot 22, to reduce the resistance of the second piston shoes 516 sliding.
In a preferred embodiment of the invention, as shown in Figure 1, it is convex in the setting one of the head of the first dummy piston 411 4111 are played, third sliding slot 24, and third sliding slot 24 are offered on the periphery of 411 corresponding stator sleeve 20 of the first dummy piston Slot bottom open up recess 25, when the second driving portion 50 not yet drives stator sleeve 20, protrusion 4111 be embedded at recess 25 in, such as This, when the second driving portion 50 not yet drives stator sleeve 20, the 25 pairs of protrusions 4111 that are recessed have certain restriction effect, to The first driving portion 40 drive stator sleeve 20 when, stator sleeve 20 can stablize in a first direction move without Play on non-first direction.When stator sleeve 20 is driven by the second driving portion 50, as shown in Figure 18, protrusion 4111 is from recessed It falls into 25 to skid off, limitation of 25 contact of recess to protrusion 4111.
In a preferred embodiment of the invention, as illustrated in fig. 7 and fig. 10, the peripheral surface of articulated section 23 at least has Partial cylindrical surface, and the diameter on the cylindrical surface is identical as the driving peripheral surface diameter of piston 42, wherein:When the first driving group It is at least part of in the priming stroke section that articulated section 23 is moved in a first direction to be located at a left side when moving linearly in a first direction It is oriented in chamber.In the present embodiment, so-called priming stroke section is construed as, should be by the second driving portion 50 having not yet been reached Before the position of driving, the shift motion of stator sleeve 20 in a first direction.In this way, when to the adjusting of eccentricity only need to by When being adjusted on first direction, articulated section 23 is at least part of to be located in left directed cavity, to stator sleeve 20 Rotation is limited, and play is carried out on non-first direction to further effectively prevent stator sleeve 20.
It should be noted that:As shown in Fig. 6 and Fig. 9, when variable pump starts from the state that eccentricity is 0 (at this point, becoming Amount pump is used as slippage pump more), original eccentricity distance drives stator sleeve 20 that can obtain in a first direction using the first driving portion 40.
In a preferred embodiment of the invention, as shown in Figure 15 and Figure 18, driving body 54 is set to the first bushing In, the second dummy piston 515 is set in the second bushing 514, and the first bushing 514 and the second bushing 58 are by strength and stiffness Larger titanium alloy is made.The effect that the larger bushing of strength and stiffness is arranged is:In the first piston shoes 55 and the second piston shoes When second direction rotates, the first piston shoes 55 and the second piston shoes 516 can generate larger 516 driving stator sleeves 20 radially Component, and the bushing of the big rigidity of high intensity prevent the component destroy the second driving group and the second balance group 51 dependent part The damage of part.
In a preferred embodiment of the invention, as shown in Figure 15 and Figure 18, the first piston shoes 55 and the second piston shoes 516 Tail portion be respectively provided with into ball head structure, and the first piston shoes 55 and the second piston shoes 516 are made by the first gland and the second gland respectively It links together respectively with driving body 54 and the second dummy piston 515.
Above example is only exemplary embodiment of the present invention, is not used in the limitation present invention, protection scope of the present invention It is defined by the claims.Those skilled in the art can within the spirit and scope of the present invention make respectively the present invention Kind modification or equivalent replacement, this modification or equivalent replacement also should be regarded as being within the scope of the present invention.

Claims (6)

1. a kind of adjusting method of variable pumpage, the variable pump includes shell, the stator sleeve that is set in the shell, is set The rotor core being placed in the stator sleeve, the multiple plungers and the driving mechanism that are arranged circumferentially on the rotor core, feature It is, the adjusting method includes:
The actual pressure of system pipeline in hydraulic system where obtaining the variable pump;
The actual pressure is set to be compared with the specified operating pressure of the hydraulic system;When the actual pressure is more than institute When stating operating pressure, the stator sleeve is set to be moved towards the direction that eccentricity reduces using driving mechanism driving stator sleeve.When described When actual pressure is less than the operating pressure, make the side that the stator sleeve becomes larger towards eccentricity using driving mechanism driving stator sleeve To movement;Wherein:
The eccentricity is the distance between the center of circle in the center of circle and the rotor core of the stator sleeve.
2. according to the adjusting method described in claim 2 variable pumpage, which is characterized in that
It is less than when the actual pressure is more than the operating pressure and the difference of the actual pressure and the operating pressure When preset pressure difference, drive the stator sleeve towards the first direction of the axis perpendicular to the rotor core using the driving mechanism Linear movement is to reduce the eccentricity;When the actual pressure is less than the operating pressure and the operating pressure and the reality When the difference of border pressure is less than preset pressure difference, drive the stator sleeve towards perpendicular to the rotor core using the driving mechanism The negative direction of the first direction of axis moves linearly to increase the eccentricity;
When the actual pressure is less than the operating pressure and the difference of the operating pressure and the actual pressure value is more than default When pressure difference, drive the stator sleeve towards the first direction straight line of the axis perpendicular to the rotor core using the driving mechanism After movement, the stator sleeve is driven to be moved towards the second direction perpendicular to the rotor core axis using the driving mechanism, with Finally increase the eccentricity;When the actual pressure is more than the operating pressure and the actual pressure and the operating pressure Difference when being more than preset pressure difference, drive the stator sleeve towards the axis perpendicular to the rotor core using the driving mechanism After the negative direction linear movement of first direction, drive the stator sleeve towards perpendicular to the rotor mandrel using the driving mechanism The second direction of line moves or the movement of the negative direction of second direction, finally to reduce the eccentricity;Wherein:
Before the stator sleeve is moved towards first direction, when the eccentricity between the rotor core and the stator sleeve is 0, institute It is the arbitrary radial direction by the center of circle of the rotor core to state first direction;When between the rotor core and the stator sleeve When eccentricity is non-zero, the first direction is direction determined by the line in the center of circle of the rotor core and the center of circle of stator sleeve;
The first direction and the angle of the second direction are more than 0 ° and are less than 90 °.
3. the adjusting method of variable pumpage according to claim 2, which is characterized in that the second direction be different from The moving direction of the first direction.
4. according to the adjusting method of the variable pumpage described in claim 2, which is characterized in that the stator sleeve is rotationally Directly or indirectly it is connected to the stator sleeve;The second direction is the rotation direction different from the first direction.
5. according to the adjusting method of the variable pumpage described in claim 4, which is characterized in that the driving mechanism includes the One driving portion and the second driving portion;First driving portion is for driving the stator sleeve to be moved towards first direction;Described second Driving portion is for driving the stator sleeve to be rotated towards the second direction.
6. a kind of variable pump, which is characterized in that the variable pump is constructed based on the adjusting method described in claim 4.
CN201810335548.XA 2018-04-11 2018-04-11 Variable pump and displacement adjusting method thereof Active CN108412760B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110171423A (en) * 2019-05-31 2019-08-27 吉林大学 A kind of pumpage compensation method under wheel hub fluid power system assistant mode

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US3969038A (en) * 1973-11-20 1976-07-13 Robert Bosch G.M.B.H. Pressure regulator for an adjustable pump
CN86209862U (en) * 1986-12-03 1988-03-16 徐冠英 Reciprocating engine with rotary cylinder
CN1464197A (en) * 2002-06-13 2003-12-31 尤尼西亚Jkc控制系统株式会社 Variable delivery pump
CN101131152A (en) * 2007-10-16 2008-02-27 天津市泽华源泵业科技发展有限公司 Constant-pressure variable radial-plunger pump
CN202833134U (en) * 2012-07-31 2013-03-27 东莞市神煜机械有限公司 Low-pressure type variable vane pump

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Publication number Priority date Publication date Assignee Title
US3918855A (en) * 1973-11-16 1975-11-11 Rexroth Gmbh G L Adjustable vane pump
US3969038A (en) * 1973-11-20 1976-07-13 Robert Bosch G.M.B.H. Pressure regulator for an adjustable pump
CN86209862U (en) * 1986-12-03 1988-03-16 徐冠英 Reciprocating engine with rotary cylinder
CN1464197A (en) * 2002-06-13 2003-12-31 尤尼西亚Jkc控制系统株式会社 Variable delivery pump
CN101131152A (en) * 2007-10-16 2008-02-27 天津市泽华源泵业科技发展有限公司 Constant-pressure variable radial-plunger pump
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110171423A (en) * 2019-05-31 2019-08-27 吉林大学 A kind of pumpage compensation method under wheel hub fluid power system assistant mode

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