CN106351813A - Compact swash plate type electric proportional axial plunger pump and control method thereof - Google Patents
Compact swash plate type electric proportional axial plunger pump and control method thereof Download PDFInfo
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- CN106351813A CN106351813A CN201610941234.5A CN201610941234A CN106351813A CN 106351813 A CN106351813 A CN 106351813A CN 201610941234 A CN201610941234 A CN 201610941234A CN 106351813 A CN106351813 A CN 106351813A
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- valve
- electric proportional
- swash plate
- pressure
- valve element
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Abstract
The invention discloses a compact swash plate type electric proportional axial plunger pump, comprising an electric proportional control valve (1) and a pump body, wherein the electric proportional control valve (1) is connected with a proportional electromagnet (7), the pump body is connected with a swash plate (6), the electric proportional control valve (1) is arranged at one side of the swash plate (6), and a return spring (5) is arranged at the other side, relative to the electric proportional control valve (1), of the swash plate (6). The control method is as follows: when an electric signal is input to the proportional electromagnet, a thrust force from the proportional electromagnet and a feedback force produced by rotating of the swash plate are applied to left and right sides of a valve core of the electric proportional control valve respectively, so that the valve core of the electric proportional control valve keeps a dynamic equilibrium, and the swash plate is also located at a swing angle corresponding to the electric signal. According to the invention, the overall size of the plunger pump can be reduced, and high compactness is achieved; and all oil lines can be arranged in a pump shell, so that the size can be further reduced.
Description
Technical field
The present invention relates to a kind of plate variable plunger pump, particularly a kind of compact inclined disc type electricity ratio axial plunger pump
And its control method.
Background technology
Inclined disc type electricity ratio axial plunger pump is conventional Hydraulic power units, by changing input proportion electro-magnet electric current
Size its discharge capacity can be controlled.The existing inclined disc type electricity proportional variable plunger pump of engineering machinery is general at present passes through
Swash plate two ends are respectively provided with an oil cylinder, control fluid to flow into or out two oil cylinders and reach by electric proportional control valve and change
Become the purpose of swashplate angle.Two conventional oil cylinders respectively two promote the oil cylinders that swash plates swing, and two oil cylinders are direct and oblique
Disk contacts, and the overall length in swash plate both sides can be caused to become big, and lead to the increase of pump overall volume.But for existing engineering
For machinery, the volume of plunger displacement pump is more little more facilitates integrally-built layout.But existing inclined disc type electricity ratio plunger displacement pump
The distribution form of two oil cylinders, the possibility of plunger displacement pump miniaturization from ceiling structure, it is unfavorable for that the miniaturization of engineering machinery will
Ask.And the electric proportional displacement control pump of routine, beyond its oil circuit control needs to be arranged on the pump housing in the form of oil pipe, is unfavorable for
The installation of engineering machinery and transport.
Content of the invention
It is an object of the invention to, a kind of compact inclined disc type electricity ratio axial plunger pump and its control method are provided.This
Invention can reduce the overall volume of plunger displacement pump, and compact is strong；Also have whole oil circuits to may be provided in pump case body, can reduce further
Volume.
Technical scheme: compact inclined disc type electricity ratio axial plunger pump it is characterised in that: include electric ratio control
Valve processed and the pump housing, electric proportional control valve is connected with proportion electro-magnet, and the pump housing is connected with swash plate, and electric proportional control valve is arranged on swash plate
Side, be provided with return spring in swash plate with respect to the opposite side of electric proportional control valve.
In aforesaid compact inclined disc type electricity ratio axial plunger pump, described electric proportional control valve includes electric proportional valve valve
Set, electric proportional valve valve pocket outer end is provided with variable cylinder, and the sidepiece of electric proportional valve valve pocket is provided with pressure oil port, oil return opening and enters to become
Amount cylinder pressure oil port, electric proportional valve valve sleeving inner wall is provided with automatically controlled valve element step, is provided with electric proportional valve valve in electric proportional valve valve pocket
Core, is provided with the guide rod extending in variable cylinder, electric proportional valve valve element inner end and electricity ratio through feedback spring in electric proportional valve valve element
It is provided with pressure spring, variable cylinder end is provided with steel ball, and steel ball is flexibly connected with swash plate between example valve valve pocket.
In aforesaid compact inclined disc type electricity ratio axial plunger pump, described electric proportional control valve is parallel with pressure cut off
Valve, variable cylinder is connected with pressure shut-off valve through check valve b；The oil-out of the described pump housing is also through a pair oppositely arranged check valve a
It is connected with external controlled interface with check valve c.
According to the control method of aforesaid compact inclined disc type electricity ratio axial plunger pump, when the input to proportion electro-magnet
During the signal of telecommunication, the electric proportional valve valve element left and right sides of electric proportional control valve is subject to the thrust of proportion electro-magnet and swash plate to rotate respectively
The feedback force leading to, makes electric proportional valve valve element keep a dynamic equilibrium, and swash plate is also at a pendulum corresponding to the signal of telecommunication
Angle.
In the control method of aforesaid compact inclined disc type electricity ratio axial plunger pump, when proportion electro-magnet power-off or be less than
During variable threshold value, the pressure oil of external controlled interface or the pressure oil of oil-out entering variable cylinder on the right side of automatically controlled valve element step,
Under the active force of pressure oil, swash plate is pushed to zero pivot angle, and now pump housing output flow is 0.
In the control method of aforesaid compact inclined disc type electricity ratio axial plunger pump, when proportion electro-magnet input current by
The cumulative added-time, on the right side of automatically controlled valve element step, valve port is closed, and the pressure oil of entering variable cylinder is cut off, meanwhile, automatically controlled valve element step
Left side is opened, and the pressure oil in variable cylinder passes through to enter oil return on the left of valve element step, makes the pressure drop in variable cylinder, swash plate exists
In the presence of return spring, pivot angle is gradually increased, and the discharge capacity of the pump housing is gradually increased simultaneously.
In the control method of aforesaid compact inclined disc type electricity ratio axial plunger pump, described swash plate angle is in the mistake increasing
The angular displacement of swash plate is changed into variable cylinder straight-line displacement by steel ball, guide rod, the power of feedback spring is with straight-line displacement amount by Cheng Zhong
Increase and increase, electric proportional valve core in the presence of feedback spring power, on the left of automatically controlled valve element step close, automatically controlled valve element step
Right side is opened, and pressure oil reenters variable cylinder, until new dynamic balance state is set up in variable cylinder both sides.
In the control method of aforesaid compact inclined disc type electricity ratio axial plunger pump, when the input current of proportion electro-magnet
When being gradually reduced, automatically controlled valve element step left and right sides valve port opening and closing is switched, and closes, automatically controlled valve element on the left of automatically controlled valve element step
Open on the right side of step, hydraulic oil entering variable cylinder on the right side of automatically controlled valve element step, the pressure in variable cylinder gradually rises, thus
Compression retracteding position spring, makes swash plate pivot angle gradually less, the discharge capacity of pump is gradually reduced simultaneously.
In the control method of aforesaid compact inclined disc type electricity ratio axial plunger pump, when electric current rising makes discharge capacity increase
Lead to system pressure to rise, pressure cut off is carried out by pressure shut-off valve and realizes self-protection.
In the control method of aforesaid compact inclined disc type electricity ratio axial plunger pump, when pressure shut-off valve is not opened,
Check valve b is closed, and pressure shut-off valve now does drainback passage and uses；After pressure shut-off valve is opened, check valve b
Open, now, electric proportional valve valve element is in any position by the function of current, swash plate all will be pushed into 0 pendulum in the presence of hydraulic coupling
Angle, realizes pressure cut off.
Compared with prior art, the present invention is decreased on the swaying direction of swash plate by variable cylinder is arranged on swash plate side
Entire length, compared to existing electricity proportioning pump, the variable cylinder that the present invention adopts, its length dimension only has the one of existing structure
Half, so required when swash plate Integral swinging space is just less, and oil circuit control is integrated in pump case, so pump
Body can relatively be made less, to reduce overall volume.There is no external oil pipe, no matter being transport or installation, all filling change
Simpler and easy to operate.And it is controlled using electric proportional control valve, as long as coding control is carried out to the input current of main pump
System, just can make main frame that the discharge capacity under various operating modes is adjusted, the intelligentized control method of achievable main frame.Used in the present invention
Number of components, the half of only existing electricity proportioning pump, the therefore present invention has the characteristics that strong antijamming capability.
Brief description
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the structural representation of electric proportional solenoid；
Fig. 3 is the structural representation of pressure shut-off valve；
Fig. 4 is the control principle schematic diagram of the present invention.
Being labeled as in accompanying drawing: 1- electric proportional control valve, 2- feedback spring, 3- rotor, 4- plunger, 5- return spring, 6-
Swash plate, 7- proportion electro-magnet, 8- electric proportional valve valve pocket, 9- electric proportional valve valve element, 10- pressure spring, 11- guide rod, 12- variable
Cylinder, 13- steel ball, 14- valve body, 15- pressure cut off valve element, 16- check valve a, 17- check valve b, 18- check valve c, 101- are automatically controlled
Valve element step, p- pressure oil port, a- entering variable cylinder pressure oil port, t- oil return opening.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples, but be not intended as to the present invention limit according to
According to.
Embodiment.Compact inclined disc type electricity ratio axial plunger pump, is constituted as shown in figure 1, including electric proportional control valve 1 He
The pump housing, electric proportional control valve 1 is connected with proportion electro-magnet 7, and the pump housing is connected with swash plate 6, and electric proportional control valve 1 is arranged on swash plate 6
Side, be provided with return spring 5 in swash plate 6 with respect to the opposite side of electric proportional control valve 1.The described pump housing generally comprises rotor 3
With plunger 4.
Described electric proportional control valve 1, is constituted as shown in Fig. 2 including electric proportional valve valve pocket 8, electric proportional valve valve pocket 8 outer end
It is provided with variable cylinder 12, the sidepiece of electric proportional valve valve pocket 8 is provided with pressure oil port p, oil return opening t and enters variable cylinder pressure oil port a, electricity
Proportioning valve valve pocket 1 inwall is provided with automatically controlled valve element step 101, is provided with electric proportional valve valve element 9, electric ratio in electric proportional valve valve pocket 1
It is provided with the guide rod 11 extending in variable cylinder 12, electric proportional valve valve element 9 inner end and electric ratio through feedback spring 2 in valve core 9
It is provided with pressure spring 10, variable cylinder 12 end is provided with steel ball 13, and steel ball 13 is flexibly connected with swash plate 6 between valve valve pocket 8.
Pressure shut-off valve is parallel with described electric proportional control valve 1, variable cylinder 12 is through check valve b17 with pressure shut-off valve even
Connect；The oil-out of the described pump housing is also connected with external controlled interface through a pair oppositely arranged check valve a16 and check valve c18.Described
Pressure shut-off valve, constituting as shown in figure 3, including valve body 14, being provided with pressure cut off valve element 15 in valve body 14.
The control method of the present invention, as shown in figure 4, wherein top is pressure shut-off valve, lower section is electric proportional control valve, s
For inlet port, b is oil-out, and y is external controlled interface, the pump housing in original state, electric proportional solenoid left position work, pump housing outlet
Oily normal open variable cylinder, so pump is initially at zero delivery.When proportion electro-magnet is energized, electric proportional control valve core 1 is in ratio electricity
In the presence of Magnet 7 thrust, start working in right position, and now pump housing outlet is truncated towards the oil circuit of variable cylinder n, and variable cylinder is connected
Oil return, swash plate 6 changes to zero delivery in the presence of return spring 5.Concrete Variable Control process is as follows:
In order that the control when outlet pressure is relatively low for the oil pump capacity is more accurate, external control oil sources need to be introduced, this oil sources should be controlled
The pivot angle of swash plate 6 processed, can not be led to outlet oil duct again, therefore, disposed check valve between outer governor pressure oil and pump discharge oil
A16 and external controlled interface setting check valve c18, when external control pressure oil is more than outlet pressure oil, check valve c18 opens, check valve
A16 closes, and it is external control pressure oil that swash plate 6 controls oil sources；When outlet pressure oil is more than external control pressure oil, check valve a16 opens,
Check valve c18 closes, and it is pump discharge pressure oil that swash plate 6 now controls oil sources.
When proportion electro-magnet 7 power-off or less than variable threshold value when, external control pressure oil or outlet pressure oil through electrically-controlled valve
Core step 101 right side entering variable cylinder, under the active force of pressure oil, swash plate 6 is pushed to zero pivot angle, and now POF is
0.
When proportion electro-magnet 7 input current is gradually increased, automatically controlled valve element step 101 right side valve port is closed, entering variable
The pressure oil of cylinder 12 is cut off, and meanwhile, automatically controlled valve element step 101 left side is opened, and the pressure oil in variable cylinder 12 passes through valve element platform
Rank 101 left side enters oil return, makes the pressure drop in variable cylinder 12, now, swash plate 6 in the presence of return spring 5, pivot angle by
Cumulative big, accordingly, the discharge capacity of pump is gradually increased., during increasing, by steel ball 13, guide rod 11 will tiltedly for swash plate 6 angle
The angular displacement of disk 6 changes into variable cylinder straight-line displacement, and the power of feedback spring 2 increases with the increase of straight-line displacement amount, electric ratio
Valve element 9 in the presence of feedback spring 2 power, close, and opens, pressure on the right side of automatically controlled valve element step 101 by automatically controlled valve element step 101 left side
Power oil reenters variable cylinder 12, until new dynamic balance state is set up in variable cylinder 12 both sides.
When the input current of proportion electro-magnet 7 is gradually reduced, automatically controlled valve element step 101 left and right sides valve port opening and closing is carried out
Switching, automatically controlled valve element step 101 left side is closed, and opens on the right side of automatically controlled valve element step 101, and hydraulic oil (the system relatively) is through electricity
Control valve element step 101 right side entering variable cylinder 12, the pressure in variable cylinder 12 gradually rises, thus compression retracteding position spring 5, makes tiltedly
Disk 6 pivot angle is gradually less, and accordingly, the discharge capacity of pump is gradually reduced.The size of electric current, determines the size of the pivot angle of swash plate 6, electricity
The consecutive variations of stream are it is achieved that the stepless change of pumpage.
From zero delivery to maximum pump discharge, corresponding electric current is interval, is to be determined by feedback spring 2 rigidity, and spring rate
Then the power output according to electric magnet 7 and current characteristics select for design, and spring rate is bigger, output flow from 0 to set solid amount area
Between longer, conversely, then shorter.Change rising of range of variables and adjust point, feedback spring 2 can be changed by increasing adjust pad and adjust
Realizing, pretightning force is bigger, and variable starting point is higher, and pretightning force is less, and variable starting point is got over for the common pretightning force of pressing spring 10
Low.
Make discharge capacity when increasing, lead to system pressure to rise when electric current rises, need pressure cut off to realize self-protection, then,
Present invention pressure shut-off valve in parallel, in order to ensure pressure shut-off valve does not operationally interfere with each other with electric proportional control valve, can be respectively
From realizing specific function, by disposing check valve b, when pressure shut-off valve is not opened, check valve b is closed, this
When pressure shut-off valve do drainback passage use；After pressure shut-off valve is opened, check valve b opens, now, no matter electric proportional valve
Core 9 is in any position by the function of current, and swash plate 6 all will be pushed into 0 pivot angle in the presence of hydraulic coupling, realize pressure cut off.
Claims (10)
1. compact inclined disc type electricity ratio axial plunger pump it is characterised in that: include electric proportional control valve (1) and the pump housing, electricity ratio
Example control valve (1) is connected with proportion electro-magnet (7), and the pump housing is connected with swash plate (6), and electric proportional control valve (1) is arranged on swash plate (6)
Side, be provided with return spring (5) in swash plate (6) with respect to the opposite side of electric proportional control valve (1).
2. compact according to claim 1 inclined disc type electricity ratio axial plunger pump it is characterised in that: the ratio control of described electricity
Valve (1) processed includes electric proportional valve valve pocket (8), and electric proportional valve valve pocket (8) outer end is provided with variable cylinder (12), electric proportional valve valve pocket
(8) sidepiece is provided with pressure oil port (p), oil return opening (t) and enters variable cylinder pressure oil port (a), on electric proportional valve valve pocket (1) inwall
It is provided with automatically controlled valve element step (101), in electric proportional valve valve pocket (1), is provided with electric proportional valve valve element (9), in electric proportional valve valve element (9)
It is provided with the guide rod (11) extending in variable cylinder (12), electric proportional valve valve element (9) inner end and electric proportional valve through feedback spring (2)
It is provided with pressure spring (10), variable cylinder (12) end is provided with steel ball (13), steel ball (13) and swash plate (6) activity between valve pocket (8)
Connect.
3. compact according to claim 2 inclined disc type electricity ratio axial plunger pump it is characterised in that: the ratio control of described electricity
Pressure shut-off valve is parallel with valve (1) processed, variable cylinder (12) is through check valve b(17) it is connected with pressure shut-off valve；The described pump housing
Oil-out is also through a pair oppositely arranged check valve a(16) and check valve c(18) it is connected with external controlled interface.
4. compact according to claim 3 inclined disc type electricity ratio axial plunger pump control method it is characterised in that: when
To proportion electro-magnet input electrical signal when, the electric proportional valve valve element left and right sides of electric proportional control valve is subject to ratio electromagnetism respectively
The thrust of ferrum and swash plate rotate the feedback force leading to, and make electric proportional valve valve element keep a dynamic equilibrium, and swash plate is also at electricity
A pivot angle corresponding to signal.
5. compact according to claim 4 inclined disc type electricity ratio axial plunger pump control method it is characterised in that: when
Proportion electro-magnet power-off or during less than variable threshold value, the pressure oil of external controlled interface or the pressure oil of oil-out are through automatically controlled valve element
Entering variable cylinder on the right side of step, under the active force of pressure oil, swash plate is pushed to zero pivot angle, and now pump housing output flow is 0.
6. compact according to claim 4 inclined disc type electricity ratio axial plunger pump control method it is characterised in that: when
When proportion electro-magnet input current is gradually increased, on the right side of automatically controlled valve element step, valve port is closed, and the pressure oil of entering variable cylinder is cut
Disconnected, open on the left of automatically controlled valve element step, the pressure oil in variable cylinder passes through to enter oil return on the left of valve element step, makes variable meanwhile
Pressure drop in cylinder, in the presence of return spring, pivot angle is gradually increased swash plate, and the discharge capacity of the pump housing is gradually increased simultaneously.
7. compact according to claim 6 inclined disc type electricity ratio axial plunger pump control method it is characterised in that: institute
State swash plate angle during increasing, the angular displacement of swash plate is changed into by variable cylinder straight-line displacement by steel ball, guide rod, feedback
The power of spring increases with the increase of straight-line displacement amount, electric proportional valve core in the presence of feedback spring power, automatically controlled valve element step
Left side is closed, and opens, pressure oil reenters variable cylinder on the right side of automatically controlled valve element step, until variable cylinder both sides are set up new power and put down
Weighing apparatus state.
8. compact according to claim 7 inclined disc type electricity ratio axial plunger pump control method it is characterised in that: when
When the input current of proportion electro-magnet is gradually reduced, automatically controlled valve element step left and right sides valve port opening and closing is switched, automatically controlled valve element
Close on the left of step, open on the right side of automatically controlled valve element step, hydraulic oil entering variable cylinder, variable cylinder on the right side of automatically controlled valve element step
In pressure gradually rise, thus compression retracteding position spring, make swash plate pivot angle gradually less, the discharge capacity of the pump housing is gradually reduced simultaneously.
9. compact according to claim 4 inclined disc type electricity ratio axial plunger pump control method it is characterised in that: when
Electric current rises makes discharge capacity lead to system pressure to rise when increasing, and carries out pressure cut off by pressure shut-off valve and realizes self-protection.
10. compact according to claim 9 inclined disc type electricity ratio axial plunger pump control method it is characterised in that:
When pressure shut-off valve is not opened, check valve b is closed, and pressure shut-off valve now does drainback passage and uses；Work as pressure
After power stop valve is opened, check valve b opens, and now, electric proportional valve valve element is in any position by the function of current, and swash plate all will be
It is pushed into 0 pivot angle in the presence of hydraulic coupling, realize pressure cut off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610941234.5A CN106351813B (en) | 2016-10-26 | 2016-10-26 | The inclined disc type electric ratio axial plunger pump of compact and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610941234.5A CN106351813B (en) | 2016-10-26 | 2016-10-26 | The inclined disc type electric ratio axial plunger pump of compact and its control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106351813A true CN106351813A (en) | 2017-01-25 |
| CN106351813B CN106351813B (en) | 2019-04-02 |
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ID=57864263
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610941234.5A Active CN106351813B (en) | 2016-10-26 | 2016-10-26 | The inclined disc type electric ratio axial plunger pump of compact and its control method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107725300A (en) * | 2017-11-15 | 2018-02-23 | 中航力源液压股份有限公司 | A kind of anti-down irrigation method and the reverse-filling Variable plunger pump of Variable plunger pump |
| CN108083116A (en) * | 2017-10-26 | 2018-05-29 | 武汉船用机械有限责任公司 | A kind of hydraulic control system for crane |
| CN110384850A (en) * | 2019-07-18 | 2019-10-29 | 南华大学 | Portable assisted respirator and assisted respiartion method |
| CN110397635A (en) * | 2019-07-30 | 2019-11-01 | 山东兰徳液压精工有限公司 | A kind of hydraulic planger pump proportional reversing valve |
| CN110500252A (en) * | 2018-05-18 | 2019-11-26 | 佛山市科达液压机械有限公司 | Plunger pump control method and device |
| CN110848111A (en) * | 2019-11-27 | 2020-02-28 | 力源液压（苏州）有限公司 | Plunger variable pump integrated control system |
| CN111005899A (en) * | 2019-12-30 | 2020-04-14 | 徐州重型机械有限公司 | Load-sensitive hydraulic system with controllable oil pump limit displacement, control method and engineering machinery |
| CN111005851A (en) * | 2019-12-25 | 2020-04-14 | 潍柴动力股份有限公司 | Displacement feedback variable mechanism of hydraulic plunger pump and hydraulic plunger pump |
| CN114962201A (en) * | 2022-05-23 | 2022-08-30 | 中航力源液压股份有限公司 | Compact type aviation hydraulic variable pump swash plate variable mechanism and method |
| US11828276B2 (en) | 2017-11-11 | 2023-11-28 | Liebherr Machines Bulle Sa | Adjusting device for an axial piston machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN110384850A (en) * | 2019-07-18 | 2019-10-29 | 南华大学 | Portable assisted respirator and assisted respiartion method |
| CN110397635A (en) * | 2019-07-30 | 2019-11-01 | 山东兰徳液压精工有限公司 | A kind of hydraulic planger pump proportional reversing valve |
| CN110848111B (en) * | 2019-11-27 | 2021-09-10 | 力源液压（苏州）有限公司 | Plunger variable pump integrated control system |
| CN110848111A (en) * | 2019-11-27 | 2020-02-28 | 力源液压（苏州）有限公司 | Plunger variable pump integrated control system |
| CN111005851A (en) * | 2019-12-25 | 2020-04-14 | 潍柴动力股份有限公司 | Displacement feedback variable mechanism of hydraulic plunger pump and hydraulic plunger pump |
| CN111005851B (en) * | 2019-12-25 | 2021-07-20 | 潍柴动力股份有限公司 | Displacement feedback variable mechanism of hydraulic plunger pump and hydraulic plunger pump |
| CN111005899B (en) * | 2019-12-30 | 2022-06-07 | 徐州重型机械有限公司 | Load-sensitive hydraulic system with controllable oil pump limit displacement, control method and engineering machinery |
| CN111005899A (en) * | 2019-12-30 | 2020-04-14 | 徐州重型机械有限公司 | Load-sensitive hydraulic system with controllable oil pump limit displacement, control method and engineering machinery |
| CN114962201A (en) * | 2022-05-23 | 2022-08-30 | 中航力源液压股份有限公司 | Compact type aviation hydraulic variable pump swash plate variable mechanism and method |
| CN114962201B (en) * | 2022-05-23 | 2023-08-08 | 中航力源液压股份有限公司 | Compact type aviation hydraulic variable pump swash plate variable mechanism and method |
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| CN106351813B (en) | 2019-04-02 |
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Application publication date: 20170125 Assignee: Suzhou Liyuan Hydraulic Co.,Ltd. Assignor: AVIC LIYUAN HYDRAULIC Co.,Ltd. Contract record no.: X2023520000016 Denomination of invention: Compact swashplate electric proportional axial piston pump and its control method Granted publication date: 20190402 License type: Exclusive License Record date: 20230625 |