CN106762993A - Automatically controlled electromechanical actuator with protecting against shock function - Google Patents
Automatically controlled electromechanical actuator with protecting against shock function Download PDFInfo
- Publication number
- CN106762993A CN106762993A CN201611195453.XA CN201611195453A CN106762993A CN 106762993 A CN106762993 A CN 106762993A CN 201611195453 A CN201611195453 A CN 201611195453A CN 106762993 A CN106762993 A CN 106762993A
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- China
- Prior art keywords
- control unit
- control
- branched pipe
- branch line
- pipe road
- 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.)
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/001—Servomotor systems with fluidic control
-
- 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
-
- 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
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/008—Reduction of noise or vibration
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a kind of automatically controlled electromechanical actuator with protecting against shock function, including：First hydraulic pipeline；Second hydraulic pipeline；Double-action variable displacement motor；First control unit；Second control unit；Regulation oil cylinder；3rd control unit.Automatically controlled electromechanical actuator with protecting against shock function of the invention is coordinated and can effectively be prevented because of working line hypertonia to the impact of double-action variable displacement motor by the second control unit and the 3rd control unit and regulation oil cylinder.Automatically controlled electromechanical actuator with protecting against shock function of the invention on quintafurcation pipeline due to being provided with choke valve, when the pressure in the first working line and the second working line is excessive, effectively prevent the flow into the hydraulic oil in rodless cavity excessive and exchange fuel-economizing cylinder and produce impact, and then double-action variable displacement motor discharge capacity is become big suddenly and is produced impact to load, double-action variable displacement motor discharge capacity under steady mobile piston rod is uniformly increased.
Description
Technical field
The present invention relates to electromechanical integration technology area, more particularly to a kind of automatically controlled electromechanical cause with protecting against shock function
Dynamic device.
Background technology
Double-action variable displacement motor can undertake load in two rotation directions, specifically, as two with double-action variable displacement motor
First working line of individual port connection and the pressure of the second working line are different, and double-action variable displacement motor becomes being capable of driving load.
Such as, when the first working line more than the second working line pressure when, double-action variable displacement motor towards a rotation direction driving load,
And when the first working line is less than the pressure in the second working line, double-action variable displacement motor drives negative towards another rotation direction
Carry.
However, control system of the prior art cannot be according to the pressure control in the first working line and the second working line
The discharge capacity of double-action variable displacement motor processed, that is to say, that no matter the pressure of the first working line and the second working line has much, two-way
The discharge capacity of variable displacement motor is constant, and so as to cause motor, because pressure is excessive, discharge capacity is constant and damage, or causes motor because of pressure mistake
It is small and discharge capacity is constant and is short of power.
The content of the invention
For above-mentioned technical problem present in existing technology, of the invention implementing has protecting against shock function there is provided a kind of
Automatically controlled electromechanical actuator.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of automatically controlled electromechanical actuator with protecting against shock function, including：
First hydraulic pipeline；
Second hydraulic pipeline；
Double-action variable displacement motor, it is used to be connected with first fluid pressure line and second fluid pressure line；
First control unit, it passes through the first branch line and is connected with first fluid pressure line, by second branched pipe
Road connects with second fluid pressure line；First control unit has makes first branch line and second branched pipe road
The first position blocked, with blocking first branch line, and make the of the second branched pipe road backflow fuel tank
Two positions and with making first branch line backflow fuel tank, and make the 3rd position that the second branched pipe road blocks；
Second control unit, it passes through Three branched pipe road and is connected with first fluid pressure line, by the 4th branched pipe
Road connects with second fluid pressure line；Second control unit has to be blocked an institute Three branched pipe road and makes the described 4th
The first position of branch line conducting and make that the Three branched pipe road turns on and make that the 4th branch line blocks the
Two positions；
Regulation oil cylinder, it includes that cylinder body, the piston being arranged in the cylinder body and one end are connected with the piston, another
The piston rod that is connected with the swash plate of the double-action variable displacement motor after the cylinder body is stretched out at end, and the piston is by the work in the cylinder body
Plug chamber is divided into rod chamber and rodless cavity；The outlet of second control unit is connected with control piper, the control piper point
Into quintafurcation pipeline and the 6th branch line, the quintafurcation pipeline is connected with the rodless cavity, the 6th branched pipe
Road connects with the rod chamber；
3rd control unit, it is arranged on the quintafurcation pipeline, and the 3rd control unit has makes the control
First position and block the control piper and make the rodless cavity backflow fuel tank that tubulation road connects with the rodless cavity
The second place, wherein：
Second control unit has Electromagnetic Control mouthful, so that when the Electromagnetic Control mouthful is powered, described the
Two control units are in the second place, and when the Electromagnetic Control mouthful is powered off, second control unit is in first position；
3rd control unit has a 3rd unit control mouth, the 3rd unit control mouth and the control pipe
Road connects, and when the pressure in the control piper increases, the 3rd control unit switches to the second place from first position；
Choke valve is provided with quintafurcation pipeline between the rodless cavity and the 3rd control unit.
Preferably, first control unit has two first module control mouths, the first module control mouth difference
Connected with first branch line and the second branched pipe road, so that when the pressure in first branch line is equal to institute
When stating the pressure in second branched pipe road, first control unit is in first position, when in first branch line
When pressure is more than the pressure in the second branched pipe road, first control unit is in the second place, when described first point
When pressure in bye-pass is less than the pressure in the second branched pipe road, first control unit is in the 3rd position.
Preferably, first control unit is three position three-way change valve.
Preferably, the 3rd control unit is two position three way directional control valve.
Preferably, the 3rd control unit is proportional reversing valve.
Compared with prior art, the beneficial effect of the automatically controlled electromechanical actuator with protecting against shock function of the invention is：
Automatically controlled electromechanical actuator with protecting against shock function of the invention passes through the second control unit and the 3rd control unit and tune
Fuel-economizing cylinder coordinates can effectively be prevented because of working line hypertonia to the impact of double-action variable displacement motor.
Second control unit of the invention make it in first position according to the power on/off of the Electromagnetic Control mouthful of Unit the 3rd and
Switch between the second place, so that the switching of the position of the second control unit is controlled by external electromagnetic, so that can be by outside
The discharge capacity of the control double-action variable displacement motor of Electromagnetic Control selectivity.
Automatically controlled electromechanical actuator with protecting against shock function of the invention on quintafurcation pipeline due to being provided with section
Stream valve, when the pressure in the first working line and the second working line is excessive, effectively prevent the hydraulic pressure into rodless cavity
The flow of oil is excessive and exchange fuel-economizing cylinder and produce impact, and then double-action variable displacement motor discharge capacity is become big suddenly and is produced punching to load
Hit, double-action variable displacement motor discharge capacity under steady mobile piston rod is uniformly increased.
Brief description of the drawings
Fig. 1 is the structural representation of the automatically controlled electromechanical actuator with protecting against shock function of the invention.
In figure：
1- double-action variable displacement motors；The working lines of 2- first；The working lines of 3- second；The control units of 4- first；First point of 5-
Bye-pass；6- second branched pipes road；The control units of 7- second；8- Three branched pipes road；The branch lines of 9- the 4th；10- the 3rd is controlled
Unit processed；11- control pipers；12- quintafurcation pipelines；The branch lines of 13- the 6th；14- adjusts oil cylinder；15- fuel tanks；16- is saved
Stream valve；101- swash plates.
Specific embodiment
To make those skilled in the art be better understood from technical scheme, below in conjunction with the accompanying drawings and specific embodiment party
Formula elaborates to the present invention.
As shown in Figure 1 The embodiment provides a kind of automatically controlled electromechanical actuator with protecting against shock function, use
In the discharge capacity according to operating pressure or operating pressure difference control double-action variable displacement motor 1, there should be the automatically controlled machine of protecting against shock function
Electric actuator includes：First hydraulic pipeline；Second hydraulic pipeline；Double-action variable displacement motor 1, it is used for and described first
Fluid pressure line and second fluid pressure line are connected；First control unit 4, it passes through the first branch line 5 with first liquid
Pressure pipeline connection, is connected by second branched pipe road 6 with second fluid pressure line；First control unit 4 has makes institute
State block in the first branch line 5 and second branched pipe road 6 first position, with blocking first branch line 5, and
Make the second place of the second branched pipe road 6 backflow fuel tank 15 and with making the backflow of the first branch line 5 fuel tank 15,
And make the 3rd position that the second branched pipe road 6 blocks；Second control unit 7, it passes through Three branched pipe road 8 with described
One fluid pressure line is connected, and is connected with second fluid pressure line by the 4th branch line 9；Second control unit 7 has
Make Three branched pipe road 8 block and make the first position of the 4th branch line 9 conducting and make the Three branched pipe
Road 8 turns on and makes the second place that the 4th branch line 9 is blocked；Regulation oil cylinder 14, it includes cylinder body, is arranged at the cylinder
Internal piston and one end is connected with the piston, and the other end stretches out oblique with the double-action variable displacement motor 1 after the cylinder body
Plunger shaft in the cylinder body is divided into rod chamber and rodless cavity by the piston rod of the connection of disk 101, the piston；Second control
The outlet of unit processed 7 is connected with control piper 11, and the control piper 11 is divided into the branch line of quintafurcation pipeline 12 and the 6th
13, the quintafurcation pipeline 12 is connected with the rodless cavity, and the 6th branch line 13 is connected with the rod chamber；3rd
Control unit 10, it is arranged on the quintafurcation pipeline 12, and the 3rd control unit 10 has makes the control piper
11 first positions connected with the rodless cavity and block the control piper 11 and make rodless cavity backflow fuel tank 15
The second place, wherein：Second control unit 7 has an Electromagnetic Control mouthful, so that when the Electromagnetic Control mouthful is powered
When, second control unit 7 is in the second place, and when the Electromagnetic Control mouthful is powered off, second control unit 7 is in
First position；3rd control unit 10 has a 3rd unit control mouth, the 3rd unit control mouth and the control
Tubulation road 11 connects, and when the pressure in the control piper 11 increases, the 3rd control unit 10 switches from first position
To the second place；Choke valve is provided with quintafurcation pipeline 12 between the rodless cavity and the 3rd control unit 10
16。
Understood according to above-mentioned, when the first working line 2 is more than the second working line 3, the first control unit 4 is in first
Position, the first working line 2 is blocked by the first control unit 4, and the hydraulic oil in the second working line 3 flows back to fuel tank 15, two-way
Variable displacement motor 1 rotates to drive load in one direction.And when the first working line 2 is excessive, Electromagnetic Control mouthful is powered, from
And the second control unit 7 is switched to the second place, so that the hydraulic oil in the first working line 2 passes through the second control unit
7 enter in control pipers 11, and hydraulic oil in control piper 11 causes that Unit the 3rd switches to the by the 3rd unit control mouth
Two positions, so that the hydraulic oil oil return box 15 in rodless cavity, and quintafurcation pipeline 12 is truncated, the liquid in control piper 11
Force feed is by the 6th branch line 13 into rod chamber so that piston rod court makes the inclination angle of the swash plate 101 of double-action variable displacement motor 1
The direction movement of increase, so that the discharge capacity increase of double-action variable displacement motor 1, the feelings for increasing the pressure of the first working line of adaptation 2
Condition, causes the situation that double-action variable displacement motor 1 is damaged to occur so as to effectively prevent because the pressure of the first working line 2 increases.Phase
Ying Di, when the second working line 3 is more than the first working line 2, the first control unit 4 is in the second place, the second instrumentation tubes
Road 3 is blocked by the first control unit 4, and the hydraulic oil in the first working line 2 flows back to fuel tank 15, and double-action variable displacement motor 1 is towards opposite
Direction rotates to drive load.And when the second working line 3 is excessive, make Electromagnetic Control mouthful power-off, so that the second control is single
Unit 7 switches to first position, so that the hydraulic oil in the second working line 3 enters control piper by the second control unit 7
In 11, the hydraulic oil in control piper 11 causes that Unit the 3rd switches to the second place by the 3rd unit control mouth, so that
Hydraulic oil oil return box 15 in rodless cavity, and quintafurcation pipeline 12 is truncated, the hydraulic oil in control piper 11 is by the 6th
Branch line 13 is into rod chamber so that piston rod is moved towards the direction for increasing the inclination angle of the swash plate 101 of double-action variable displacement motor 1
It is dynamic, so that the discharge capacity increase of double-action variable displacement motor 1, the situation for increasing the pressure of the second working line of adaptation 3, so as to effectively prevent
Stopped causes the situation that double-action variable displacement motor 1 is damaged to occur because the pressure of the second working line 3 increases.
It follows that the second control unit 7 and the 3rd control unit 10 and regulation oil cylinder 14 can be prevented effectively because of work
Make loine pressure it is too high and to the impact of double-action variable displacement motor 1.
Second control unit 7 of the invention make it in first position according to the power on/off of the Electromagnetic Control mouthful of Unit the 3rd and
Switch between the second place, so that the switching of the position of the second control unit 7 is controlled by external electromagnetic, so that can be by outside
The discharge capacity of the control double-action variable displacement motor 1 of Electromagnetic Control selectivity.
Automatically controlled electromechanical actuator with protecting against shock function of the invention on quintafurcation pipeline 12 due to being provided with
Choke valve 16, when the pressure in the first working line 2 and the second working line 3 is excessive, effectively prevent into rodless cavity
Hydraulic oil flow it is excessive and exchange fuel-economizing cylinder 14 and produce impact, and then the discharge capacity of double-action variable displacement motor 1 is become big and right suddenly
Load produces impact, the discharge capacity under steady mobile piston rod of double-action variable displacement motor 1 is uniformly increased.
Preferably, first control unit 4 has two first module control mouths, the first module control mouth difference
Connected with first branch line 5 and the second branched pipe road 6, so that when pressure in first branch line 5 etc.
When pressure in the second branched pipe road 6, first control unit 4 is in first position, when first branched pipe
When pressure in road 5 is more than the pressure in the second branched pipe road 6, first control unit 4 is in the second place, works as institute
When stating pressure in the first branch line 5 less than pressure in the second branched pipe road 6, first control unit 4 is in
3rd position.
Preferably, first control unit 4 is three position three-way change valve.
Preferably, the 3rd control unit 10 is two position three way directional control valve.
Preferably, the 3rd control unit 10 is proportional reversing valve.
Above example is only exemplary embodiment of the 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 make respectively in essence of the invention and protection domain to the present invention
Modification or equivalent are planted, this modification or equivalent also should be regarded as being within the scope of the present invention.
Claims (5)
1. a kind of automatically controlled electromechanical actuator with protecting against shock function, it is characterised in that including：
First hydraulic pipeline；
Second hydraulic pipeline；
Double-action variable displacement motor, it is used to be connected with first fluid pressure line and second fluid pressure line；
First control unit, it passes through the first branch line and is connected with first fluid pressure line, by second branched pipe road with
The second fluid pressure line connection；First control unit has makes first branch line and second branched pipe road cut
Disconnected first position, with blocking first branch line, and the second branched pipe road is flowed back the second of fuel tank
Put and with making first branch line backflow fuel tank, and make the 3rd position that the second branched pipe road blocks；
Second control unit, it passes through Three branched pipe road and is connected with first fluid pressure line, by the 4th branch line with
The second fluid pressure line connection；Second control unit has makes institute Three branched pipe road block and make the 4th branch
First position and the Three branched pipe road is turned on and make the second that the 4th branch line is blocked that pipeline is turned on
Put；
Regulation oil cylinder, it includes that cylinder body, the piston being arranged in the cylinder body and one end are connected with the piston, and the other end is stretched
Go out the piston rod being connected with the swash plate of the double-action variable displacement motor after the cylinder body, the piston is by the plunger shaft in the cylinder body
It is divided into rod chamber and rodless cavity；The outlet of second control unit is connected with control piper, and the control piper is divided into
Quintafurcation pipeline and the 6th branch line, the quintafurcation pipeline are connected with the rodless cavity, the 6th branch line with
The rod chamber connection；
3rd control unit, it is arranged on the quintafurcation pipeline, and the 3rd control unit has makes the control pipe
First position that road connects with the rodless cavity and block the control piper and make the of the rodless cavity backflow fuel tank
Two positions, wherein：
Second control unit has an Electromagnetic Control mouthful, so that when the Electromagnetic Control mouthful is powered, second control
Unit processed is in the second place, and when the Electromagnetic Control mouthful is powered off, second control unit is in first position；
3rd control unit has a 3rd unit control mouth, and the 3rd unit control mouth connects with the control piper
Logical, when the pressure in the control piper increases, the 3rd control unit switches to the second place from first position；
Choke valve is provided with quintafurcation pipeline between the rodless cavity and the 3rd control unit.
2. the automatically controlled electromechanical actuator with protecting against shock function according to claim 1, it is characterised in that described first
Control unit has two first module control mouths, the first module control mouth respectively with first branch line and described
Second branched pipe road connects, so that when the pressure in first branch line is equal to the pressure in the second branched pipe road
When, first control unit is in first position, when the pressure in first branch line is more than the second branched pipe
During pressure in road, first control unit is in the second place, when the pressure in first branch line is less than described
During pressure in second branched pipe road, first control unit is in the 3rd position.
3. the automatically controlled electromechanical actuator with protecting against shock function according to claim 1, it is characterised in that described first
Control unit is three position three-way change valve.
4. the automatically controlled electromechanical actuator with protecting against shock function according to claim 1, it is characterised in that the described 3rd
Control unit is two position three way directional control valve.
5. the automatically controlled electromechanical actuator with protecting against shock function according to claim 4, it is characterised in that the described 3rd
Control unit is proportional reversing valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611195453.XA CN106762993A (en) | 2016-12-22 | 2016-12-22 | Automatically controlled electromechanical actuator with protecting against shock function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611195453.XA CN106762993A (en) | 2016-12-22 | 2016-12-22 | Automatically controlled electromechanical actuator with protecting against shock function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106762993A true CN106762993A (en) | 2017-05-31 |
Family
ID=58900425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611195453.XA Pending CN106762993A (en) | 2016-12-22 | 2016-12-22 | Automatically controlled electromechanical actuator with protecting against shock function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106762993A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19509869A1 (en) * | 1995-03-17 | 1996-09-26 | Sauer Sundstrand Gmbh & Co | Control and regulation system for automotive hydrostatic drive |
| US5709282A (en) * | 1995-03-31 | 1998-01-20 | Fiat-Hatachi Excavators S.P.A. | Traveling control system for hydraulically driven vehicle |
| WO2004068004A1 (en) * | 2003-01-29 | 2004-08-12 | Brueninghaus Hydromatik Gmbh | Control of a hydrostatic gearbox |
| CN1570346A (en) * | 2004-05-09 | 2005-01-26 | 浙江大学 | Enclosed return circuit hydraulic beam-pumping unit utilizing frequency conversion technology |
| EP1873424A1 (en) * | 2006-06-29 | 2008-01-02 | Brueninghaus Hydromatik Gmbh | Hydrostatic drive and control method therefore |
| US7487707B2 (en) * | 2006-09-27 | 2009-02-10 | Husco International, Inc. | Hydraulic valve assembly with a pressure compensated directional spool valve and a regeneration shunt valve |
| CN101871477A (en) * | 2010-06-22 | 2010-10-27 | 上海萨澳液压传动有限公司 | Intermediate-pressure control two-position variable axial plunger hydraulic motor |
-
2016
- 2016-12-22 CN CN201611195453.XA patent/CN106762993A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19509869A1 (en) * | 1995-03-17 | 1996-09-26 | Sauer Sundstrand Gmbh & Co | Control and regulation system for automotive hydrostatic drive |
| US5709282A (en) * | 1995-03-31 | 1998-01-20 | Fiat-Hatachi Excavators S.P.A. | Traveling control system for hydraulically driven vehicle |
| WO2004068004A1 (en) * | 2003-01-29 | 2004-08-12 | Brueninghaus Hydromatik Gmbh | Control of a hydrostatic gearbox |
| CN1570346A (en) * | 2004-05-09 | 2005-01-26 | 浙江大学 | Enclosed return circuit hydraulic beam-pumping unit utilizing frequency conversion technology |
| EP1873424A1 (en) * | 2006-06-29 | 2008-01-02 | Brueninghaus Hydromatik Gmbh | Hydrostatic drive and control method therefore |
| US7487707B2 (en) * | 2006-09-27 | 2009-02-10 | Husco International, Inc. | Hydraulic valve assembly with a pressure compensated directional spool valve and a regeneration shunt valve |
| CN101871477A (en) * | 2010-06-22 | 2010-10-27 | 上海萨澳液压传动有限公司 | Intermediate-pressure control two-position variable axial plunger hydraulic motor |
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Application publication date: 20170531 |