CN107906064A - The device and variable method for control speed of changeable constant pressure variable displacement pump variable speed - Google Patents
The device and variable method for control speed of changeable constant pressure variable displacement pump variable speed Download PDFInfo
- Publication number
- CN107906064A CN107906064A CN201711423735.5A CN201711423735A CN107906064A CN 107906064 A CN107906064 A CN 107906064A CN 201711423735 A CN201711423735 A CN 201711423735A CN 107906064 A CN107906064 A CN 107906064A
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- China
- Prior art keywords
- variable
- displacement pump
- constant pressure
- variable displacement
- pressure variable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000003921 oil Substances 0.000 claims abstract description 40
- 238000013016 damping Methods 0.000 claims abstract description 29
- 230000008859 change Effects 0.000 claims abstract description 18
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims description 12
- 239000012530 fluid Substances 0.000 claims description 4
- 230000035772 mutation Effects 0.000 claims description 4
- 230000004907 flux Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 239000000446 fuel Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 239000002828 fuel tank Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
The device and variable method for control speed of changeable constant pressure variable displacement pump variable speed, including constant pressure variable displacement pump（1）；With constant pressure variable displacement pump（1）The variable cylinder of connection；The pressure-compensated valve of control chamber and oil inlet and constant pressure variable displacement pump outlet（2）；The rodless cavity of variable cylinder（6）It is connected with the first oil outlet of pressure-compensated valve, the rod chamber of variable cylinder（7）Mechanically connected with constant pressure variable displacement pump；First oil outlet of the pressure-compensated valve and the rodless cavity of variable cylinder（6）Between connecting pipeline be equipped with switchable hydraulic oil stream amount speed adjusting gear（5）；Pressure-compensated valve（2）The first oil outlet and oil return box between be in series with the second damping（3）With the 3rd damping（4）, the 3rd damping is equipped between the second oil outlet and oil return box（4）.Speed adjusting gear can change the damping size of variable cylinder sensitive cavity inlet and outlet of fuel channel, so as to change the variable regulating time of constant pressure variable displacement pump, ensure that constant pressure variable displacement pump is in optimal operating condition.
Description
Technical field
The present invention relates to variable pump technical field, more particularly, to a kind of dress of changeable constant pressure variable displacement pump variable speed
Put；The invention further relates to a kind of control method of constant pressure variable displacement pump variable speed.
Background technology
Higher and higher with requiring hydraulic system pressure grade and energy-efficient performance, variable pump obtains in hydraulic system
It is commonly used.Fig. 1 is illustrated that prior art variable pump Hydraulic System Principle schematic diagram, and oil pump systems include variable pump 1 ', become
Cylinder 2 ', pressure-compensated valve S and damping DR are measured, wherein：Variable pump 1 ' has pump discharge, and pump discharge is connected to control element（In figure
It is not shown）.Pump discharge connects two other branch L1 and L2, L1 branch are connected to the control chamber of pressure-compensated valve S, and L2 oil circuits connect
It is connected to pressure-compensated valve S oil inlets.Pressure-compensated valve S also has an oil outlet, the oil outlet and the rodless cavity of variable cylinder 2 '
It is connected.The piston rod of variable cylinder 2 ' is mechanically connected with variable pump 1 ', and the expanding-contracting action of the piston rod of variable cylinder 2 ' can change
The discharge capacity of variable pump 1 '.
It is a typical technical problem that hydraulic pump, which is emptied in engineer application,.At present, it is emptied both at home and abroad for hydraulic pump
Research be concentrated mainly on outside air and be mixed into caused by fluid and be emptied, the solution method of use is improved fuel tank structure mostly
And the passive mode such as pipeline connection, and for being mutated because of flow caused by the research that is instantaneously emptied it is also fewer.Constant pressure becomes
Amount pump easily causes constant pressure variable displacement pump to be damaged because being emptied, seriously limits perseverance when being applied to the occasion of frequent variable
The use scope of pressure variable amount pump.
The content of the invention
The defects of in order to overcome the prior art, present invention solves the technical problem that being to provide a kind of changeable constant-pressure variable
Pump the device of variable speed and a kind of control method of constant pressure variable displacement pump variable speed is provided.Can effectively solve constant pressure variable displacement pump because
The technical problem that frequent fast variable causes high frequency to be instantaneously emptied and damages, makes constant pressure variable displacement pump be applicable to frequent variable
Occasion, expands the use scope of constant pressure variable displacement pump.
In order to solve the above-mentioned technical problem, on the one hand, the present invention provides a kind of changeable constant pressure variable displacement pump variable speed
Device, including constant pressure variable displacement pump；The variable cylinder being connected with the constant pressure variable displacement pump；Control chamber and oil inlet and the constant-pressure variable
The pressure-compensated valve of pump discharge connection；The rodless cavity of the variable cylinder is connected with the first oil outlet of the pressure-compensated valve,
The rod chamber of variable cylinder is mechanically connected with constant pressure variable displacement pump；First oil outlet of the pressure-compensated valve and the rodless cavity of variable cylinder
Between connecting pipeline be equipped with switchable hydraulic oil stream amount speed adjusting gear；First oil outlet of the pressure-compensated valve is with returning
The second damping and the 3rd damping are in series between fuel tank, the 3rd damping is equipped between the second oil outlet and oil return box.
Preferably, the device of changeable constant pressure variable displacement pump variable speed provided by the invention, the speed adjusting gear is can be more
Change the damping orifice plate of different damping bore dia.
Preferably, the device of changeable constant pressure variable displacement pump variable speed provided by the invention, the speed adjusting gear is manual
Regulating valve or electric proportional-regulation valve.
Preferably, the device of changeable constant pressure variable displacement pump variable speed provided by the invention, the speed adjusting gear are throttling
Valve or speed governing valve.
Preferably, the device of changeable constant pressure variable displacement pump variable speed provided by the invention, the speed adjusting gear are to change
To valve and at least two different size of damping holes are combined into handover module, change fluid flow direction by reversal valve to change damping
The size in hole.
In order to solve the above-mentioned technical problem, on the other hand, the present invention provides the control of changeable constant pressure variable displacement pump variable speed
Method processed, the constant pressure variable displacement pump are equipped with the device of changeable constant pressure variable displacement pump variable speed, which includes constant pressure variable displacement pump,
The pressure compensation of the variable cylinder being connected with the constant pressure variable displacement pump, control chamber and oil inlet and the constant pressure variable displacement pump outlet
Valve, the rodless cavity of the variable cylinder are connected with the first oil outlet of the pressure-compensated valve, the rod chamber and constant pressure of variable cylinder
Variable pump mechanically connects, and the connecting pipeline between the first oil outlet of the pressure-compensated valve and the rodless cavity of variable cylinder is equipped with
The speed adjusting gear of switchable hydraulic oil stream amount；When constant pressure variable displacement pump operate in it is low to constant-voltage characteristic requirement, it is necessary to frequently variable and
When in multivariable process in the presence of the operating mode for causing constant pressure variable displacement pump to be emptied because of fast variable, it is logical that speed adjusting gear is adjusted to small area throttling
Road, in multivariable process, extends the variant time of constant pressure variable displacement pump, reduces the flux change velocity of constant pressure variable displacement pump, avoid perseverance
Pressure variable amount pump is damaged because being instantaneously emptied flow mutation；When constant pressure variable displacement pump operates in high to constant-voltage characteristic requirement, it is not required to frequently
Variable, though or frequently variable variable amount is smaller, when will not cause the operating mode that constant pressure variable displacement pump is emptied in multivariable process, governor
Structure is adjusted to large area throttling passage, reduces the variant time of variable pump, constant pressure variable displacement pump is realized fast variable, reaches constant pressure
The good control targe of characteristic；When constant pressure variable displacement pump, to operate in both constant-voltage characteristic requirements to variable pump high, also needs frequent variable
During operating mode, speed adjusting gear uses proportional flow control valve or speed governing valve, its uninterrupted is variable, according to the pressure to constant pressure variable displacement pump
And the demand of variant time, change the throttling passage area of speed adjusting gear, constant pressure variable displacement pump is not caused because of fast variable
It is emptied.
Technical solution provided by the invention, is additionally arranged a switchable hydraulic between pressure-compensated valve and variable cylinder sensitive cavity
The speed adjusting gear of oil stream amount, can change the damping size of variable cylinder sensitive cavity inlet and outlet of fuel channel, so as to change constant pressure variable displacement pump
Variable regulating time, ensures that constant pressure variable displacement pump is in optimal operating condition.Though to be not required to frequent variable or frequently variable but
Variable magnitude is smaller, and when will not cause the operating mode that constant pressure variable displacement pump is emptied in multivariable process, speed adjusting gear is adjusted to large area section
Circulation road, reduces the variant time of variable pump, constant pressure variable displacement pump is realized fast variable, reaches the good control mesh of constant-voltage characteristic
Mark；Constant-voltage characteristic is being required low, it is necessary to frequently exist in variable and multivariable process because fast variable causes constant-pressure variable pumping
During the operating mode of sky, speed adjusting gear is adjusted to small area throttling passage, in multivariable process, when extending the variable of constant pressure variable displacement pump
Between, the flux change velocity of constant pressure variable displacement pump is reduced, avoids constant pressure variable displacement pump from being damaged because being instantaneously emptied flow mutation, in reality
It is easy to implement in engineering, expand the use scope of constant pressure variable displacement pump.
Brief description of the drawings
Attached drawing is used for providing a further understanding of the present invention, forms the part of the application, schematic reality of the invention
Apply example and its explanation is used to explain the present invention, do not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is prior art variable pump Hydraulic System Principle schematic diagram；
Fig. 2 is the Hydraulic System Principle schematic diagram of the device of the changeable constant pressure variable displacement pump variable speed of embodiment.
Embodiment
The embodiment of the present invention is described in further detail below in conjunction with the accompanying drawings.
The device of changeable constant pressure variable displacement pump variable speed as shown in Figure 2, including constant pressure variable displacement pump 1, with constant-pressure variable
The pressure-compensated valve 2 of the variable cylinder of the connection of pump 1, control chamber and oil inlet and 1 outlet of constant pressure variable displacement pump, the variable cylinder
Rodless cavity 6 is connected with the first oil outlet of pressure-compensated valve 2, and rod chamber 7 and the constant pressure variable displacement pump 1 of variable cylinder mechanically connect,
Connecting pipeline between first oil outlet of pressure-compensated valve 2 and the rodless cavity 6 of variable cylinder is equipped with switchable hydraulic oil stream amount
Speed adjusting gear 5, the second damping 3 and the 3rd damping 4 are in series between the first oil outlet and oil return box of pressure-compensated valve 2, the
The 3rd damping 4 is equipped between two oil outlets and oil return box.
Speed adjusting gear 5 is the damping orifice plate of replaceable different damping bore dia, manual modulation valve or electric proportional-regulation valve,
Throttle valve or speed governing valve, by reversal valve and at least two different size of damping holes are combined into handover module, are changed by reversal valve
The size of fluid flow direction to change damping hole etc..
The setting pressure of constant pressure variable displacement pump 1 is by the pressure regulating screw step-less adjustment of pressure-compensated valve 2, and with the shape of spring force
Formula is acted on the spool of pressure-compensated valve 2, and pump discharge pressure is then by controlling what oil circuit was respectively acting on variable cylinder to have bar
The spool of chamber 7 and pressure-compensated valve 2.Its Isobarically Control principle is to feed back by the change of outlet pressure, constant pressure variable displacement pump
Its output flow is automatically adjusted, so as to fulfill the constant of pressure.
The control process of constant pressure variable displacement pump 1 includes：When constant pressure variable displacement pump 1 operate in it is low to constant-voltage characteristic requirement, it is necessary to frequency
When in numerous variable and multivariable process in the presence of the operating mode for causing constant pressure variable displacement pump 1 to be emptied because of fast variable, speed adjusting gear 5 switches to
The small damping flow channel of flow velocity, in multivariable process, extends the variant time of constant pressure variable displacement pump 1, reduces the flow of constant pressure variable displacement pump 1
Rate of change, avoids constant pressure variable displacement pump 1 from being damaged because being instantaneously emptied flow mutation；When constant pressure variable displacement pump 1 is operated in variable pump
Constant-voltage characteristic require high, be not required to frequent variable, though or frequently variable variable magnitude is smaller, will not cause perseverance in multivariable process
During the operating mode that pressure variable amount pump 1 is emptied, speed adjusting gear 5 switches to the big damping flow channel of flow velocity, reduces the variant time of variable pump, makes
Constant pressure variable displacement pump 1 realizes fast variable, reaches the good control targe of constant-voltage characteristic；When constant pressure variable displacement pump 1 is operated in both to variable
The constant-voltage characteristic of pump requires height, and when also needing the operating mode of frequent variable, speed adjusting gear 5 uses proportional flow control valve or speed governing valve, its
Uninterrupted continuous variable, according to the pressure and the demand of variant time to constant pressure variable displacement pump 1, the section of change speed adjusting gear 5
Circulation road area, makes constant pressure variable displacement pump 1 not cause because of fast variable on the premise of being emptied, realizes fast variable.
It is clear that the invention is not restricted to above preferred embodiment, can also limit in the claims in the present invention and specification
In spirit, the conversion and improvement of diversified forms are carried out, same technical problem, and technique effect expected from acquirement can be solved, therefore
Do not repeat.Those of ordinary skill in the art can from present disclosure directly or all schemes for associating, if
Within the spirit that claim limits, protection scope of the present invention is fallen within.
Claims (6)
1. a kind of device of changeable constant pressure variable displacement pump variable speed, including constant pressure variable displacement pump（1）；With the constant pressure variable displacement pump
（1）The variable cylinder of connection；Control chamber and oil inlet and the constant pressure variable displacement pump（1）The pressure-compensated valve of outlet（2）；It is described
The rodless cavity of variable cylinder（6）With the pressure-compensated valve（2）The first oil outlet be connected, the rod chamber of variable cylinder（7）With perseverance
Pressure variable amount pumps（1）Mechanically connect；It is characterized in that, the pressure-compensated valve（2）The first oil outlet and variable cylinder rodless cavity
（6）Between connecting pipeline be equipped with switchable hydraulic oil stream amount speed adjusting gear（5）；The pressure-compensated valve（2）First
The second damping is in series between oil outlet and oil return box（3）With the 3rd damping（4）, the is equipped between the second oil outlet and oil return box
Three dampings（4）.
2. the device of changeable constant pressure variable displacement pump variable speed according to claim 1, it is characterised in that the governor
Structure（5）For the damping orifice plate of replaceable different damping bore dia.
3. the device of changeable constant pressure variable displacement pump variable speed according to claim 1, it is characterised in that the governor
Structure（5）For manual modulation valve or electric proportional-regulation valve.
4. the device of changeable constant pressure variable displacement pump variable speed according to claim 1, it is characterised in that the governor
Structure（5）For throttle valve or speed governing valve.
5. the device of changeable constant pressure variable displacement pump variable speed according to claim 1, it is characterised in that the governor
Structure（5）For by reversal valve and at least two different size of damping holes are combined into handover module, pass through reversal valve and change fluid stream
Always the size of damping hole is changed.
6. a kind of control method of changeable constant pressure variable displacement pump variable speed, it is characterised in that the constant pressure variable displacement pump is equipped with can
Switch the device of constant pressure variable displacement pump variable speed, which includes constant pressure variable displacement pump（1）, with the constant pressure variable displacement pump（1）Connection
Variable cylinder, control chamber and oil inlet and the constant pressure variable displacement pump（1）The pressure-compensated valve of outlet（2）, the variable cylinder
Rodless cavity（6）With the pressure-compensated valve（2）The first oil outlet be connected, the rod chamber of variable cylinder（7）With constant-pressure variable
Pump（1）Mechanically connect, the pressure-compensated valve（2）The first oil outlet and variable cylinder rodless cavity（6）Between connecting pipeline
It is equipped with the speed adjusting gear of switchable hydraulic oil stream amount（5）；Work as constant pressure variable displacement pump（1）Operate in, need low to constant-voltage characteristic requirement
Want to exist because fast variable causes constant pressure variable displacement pump in frequent variable and multivariable process（1）During the operating mode being emptied, speed adjusting gear
（5）Small area throttling passage is adjusted to, in multivariable process, extends constant pressure variable displacement pump（1）Variant time, reduce constant-pressure variable
Pump（1）Flux change velocity, avoid constant pressure variable displacement pump（1）Damaged because being instantaneously emptied flow mutation；Work as constant pressure variable displacement pump（1）
It is high to operate in constant-voltage characteristic requirement to variable pump, is not required to frequent variable, though or frequent variable but variable magnitude is smaller, variable
During will not cause constant pressure variable displacement pump（1）During the operating mode being emptied, speed adjusting gear（5）Large area throttling passage is adjusted to, is reduced
The variant time of variable pump, makes constant pressure variable displacement pump（1）Realize fast variable, reach the good control targe of constant-voltage characteristic；Work as constant pressure
Variable pump（1）It is high to operate in both constant-voltage characteristic requirements to variable pump, when also needing the operating mode of frequent variable, speed adjusting gear（5）Adopt
With proportional flow control valve or speed governing valve, its uninterrupted is variable, according to constant pressure variable displacement pump（1）Pressure and variant time
Demand, changes speed adjusting gear（5）Throttling passage area, make constant pressure variable displacement pump（1）It will not cause to be emptied because of fast variable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711423735.5A CN107906064A (en) | 2017-12-25 | 2017-12-25 | The device and variable method for control speed of changeable constant pressure variable displacement pump variable speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711423735.5A CN107906064A (en) | 2017-12-25 | 2017-12-25 | The device and variable method for control speed of changeable constant pressure variable displacement pump variable speed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107906064A true CN107906064A (en) | 2018-04-13 |
Family
ID=61871264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711423735.5A Pending CN107906064A (en) | 2017-12-25 | 2017-12-25 | The device and variable method for control speed of changeable constant pressure variable displacement pump variable speed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107906064A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109899333A (en) * | 2019-03-29 | 2019-06-18 | 潍柴动力股份有限公司 | Valve block, hydraulic control system and vehicle |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070006580A1 (en) * | 2003-09-11 | 2007-01-11 | Bosch Rexroth Ag | Control system and method for supplying pressure means to at least two hydraulic consumers |
| CN201461362U (en) * | 2009-05-05 | 2010-05-12 | 上海电气液压气动有限公司 | Variable control mechanism of plunger piston variable pump |
| DE102010039350A1 (en) * | 2010-08-16 | 2012-02-16 | Zf Friedrichshafen Ag | Method for operating a hydraulic device of a transmission device |
| CN102384113A (en) * | 2011-08-09 | 2012-03-21 | 三一重机有限公司 | Oil supply and energy-saving device for mining dump truck |
| CN204739183U (en) * | 2015-06-11 | 2015-11-04 | 力源液压（苏州）有限公司 | Hydraulic transmission device's servo control with fixed set -point mechanism |
| CN105134578A (en) * | 2015-07-30 | 2015-12-09 | 徐州重型机械有限公司 | Plunger pump with energy recycling function |
| CN105156391A (en) * | 2015-09-17 | 2015-12-16 | 徐州工业职业技术学院 | Composite variable pump and hydraulic control system using composite variable pump |
| CN205389333U (en) * | 2016-03-20 | 2016-07-27 | 商旭东 | Hydraulic drive rotary cultivator |
| CN205478600U (en) * | 2016-01-13 | 2016-08-17 | 潍柴动力股份有限公司 | Constant voltage variable pump |
| CN207715451U (en) * | 2017-12-25 | 2018-08-10 | 邵阳维克液压股份有限公司 | The device of changeable constant pressure variable displacement pump variable speed |
-
2017
- 2017-12-25 CN CN201711423735.5A patent/CN107906064A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070006580A1 (en) * | 2003-09-11 | 2007-01-11 | Bosch Rexroth Ag | Control system and method for supplying pressure means to at least two hydraulic consumers |
| CN201461362U (en) * | 2009-05-05 | 2010-05-12 | 上海电气液压气动有限公司 | Variable control mechanism of plunger piston variable pump |
| DE102010039350A1 (en) * | 2010-08-16 | 2012-02-16 | Zf Friedrichshafen Ag | Method for operating a hydraulic device of a transmission device |
| CN102384113A (en) * | 2011-08-09 | 2012-03-21 | 三一重机有限公司 | Oil supply and energy-saving device for mining dump truck |
| CN204739183U (en) * | 2015-06-11 | 2015-11-04 | 力源液压（苏州）有限公司 | Hydraulic transmission device's servo control with fixed set -point mechanism |
| CN105134578A (en) * | 2015-07-30 | 2015-12-09 | 徐州重型机械有限公司 | Plunger pump with energy recycling function |
| CN105156391A (en) * | 2015-09-17 | 2015-12-16 | 徐州工业职业技术学院 | Composite variable pump and hydraulic control system using composite variable pump |
| CN205478600U (en) * | 2016-01-13 | 2016-08-17 | 潍柴动力股份有限公司 | Constant voltage variable pump |
| CN205389333U (en) * | 2016-03-20 | 2016-07-27 | 商旭东 | Hydraulic drive rotary cultivator |
| CN207715451U (en) * | 2017-12-25 | 2018-08-10 | 邵阳维克液压股份有限公司 | The device of changeable constant pressure variable displacement pump variable speed |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109899333A (en) * | 2019-03-29 | 2019-06-18 | 潍柴动力股份有限公司 | Valve block, hydraulic control system and vehicle |
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Application publication date: 20180413 |