CN106523453A - Electromechanical actuator having cavity prevention function - Google Patents
Electromechanical actuator having cavity prevention function Download PDFInfo
- Publication number
- CN106523453A CN106523453A CN201611195420.5A CN201611195420A CN106523453A CN 106523453 A CN106523453 A CN 106523453A CN 201611195420 A CN201611195420 A CN 201611195420A CN 106523453 A CN106523453 A CN 106523453A
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- CN
- China
- Prior art keywords
- control
- control unit
- pipeline
- pressure
- line
- 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
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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
- 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
- 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
- F04B1/28—Control of machines or pumps with stationary cylinders
- F04B1/29—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
- F04B1/295—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
-
- 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
- F04B1/30—Control of machines or pumps with rotary cylinder blocks
- F04B1/32—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
- F04B1/324—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
-
- 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
- F15B13/16—Special measures for feedback, e.g. by a follow-up device
-
- 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
Abstract
The invention discloses an electromechanical actuator having a cavity prevention function. The electromechanical actuator comprises a first hydraulic working pipeline, a second hydraulic working pipeline, a throttling valve, a two-way variable displacement motor, a first control unit, a second control unit, an adjusting oil cylinder, a third control unit and an overflow valve. The second control unit of the electromechanical actuator is switched between a first position and a second position according to differential pressure between a first external control pipeline and a second external control pipeline, so that the position switching of the second control unit is controlled by an external pipeline, and the displacement of the two-way variable displacement motor can be controlled selectively through external control. The overflow valve is arranged on an oil return pipeline of the first control unit, and when one working pipeline having greater pressure is used for driving the two-way variable displacement motor, the overflow valve can allow hydraulic oil in the other working pipeline having less pressure to return to an oil tank at certain pressure, so that a situation that the two-way variable displacement motor generates a cavity due to the fact that the flow of the hydraulic oil, in the working pipeline having less pressure, which returns to the oil tank is too high is avoided effectively.
Description
Technical field
The present invention relates to electromechanical integration technology area, more particularly to a kind of electromechanical actuator with antiaircraft acupoints.
Background technology
Double-action variable displacement motor can undertake load in two rotation directions, specifically, as two with double-action variable displacement motor
The pressure of first working line and the second working line of individual port connection is 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 little and discharge capacity is constant and is short of power.
The content of the invention
For above-mentioned technical problem present in existing technology, implementing for the present invention has antiaircraft acupoints there is provided a kind of
Electromechanical actuator.
To solve above-mentioned technical problem, the technical solution used in the present invention is：
A kind of electromechanical actuator with antiaircraft acupoints, including：
First hydraulic pipeline；
Second hydraulic pipeline；
Double-action variable displacement motor, which is used to be connected with first fluid pressure line and second fluid pressure line；
First control unit, which is passed through the first branch line and is connected with first fluid pressure line, by second branched pipe
Road is connected 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 have and make first branch line backflow fuel tank, and make the 3rd position that the second branched pipe road blocks；
Second control unit, which is passed through Three branched pipe road and is connected with first fluid pressure line, by the 4th branched pipe
Road is connected with second fluid pressure line；Second control unit has makes institute Three branched pipe road block and make 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；
Oil cylinder is adjusted, which includes that cylinder body, the piston being arranged in the cylinder body and one end are connected with the piston, another
End stretch out the cylinder body after the piston rod that is connected with the swash plate of the double-action variable displacement motor, 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 is connected with the rod chamber；
3rd control unit, which 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 is connected with the rodless cavity
The second position, wherein：
Second control unit has two second unit control mouths, and two second unit control mouths are respectively with the
One external control pipeline and the second external control pipeline connection, so that when the pressure in the first external control pipeline is more than institute
When stating the pressure in the second external control pipeline, second control unit is in the second position, when first external control
When pressure in pipeline is less than the pressure in the second external control pipeline, second control unit is in the second 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 position from first position；
Choke valve is provided with quintafurcation pipeline between the rodless cavity and the 3rd control unit；
Overflow valve is provided with the return line of first control unit.
Preferably, first control unit has two first module control mouths, the first module control mouth difference
Connect 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 position, 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 electromechanical actuator with antiaircraft acupoints of the invention is：The present invention
The electromechanical actuator with antiaircraft acupoints pass through the second control unit and the 3rd control unit and adjust oil cylinder to coordinate energy
It is enough effectively to prevent because of working line hypertonia and the impact to double-action variable displacement motor.
Pressure official post of second control unit of the present invention according to the first external control pipeline and the second external control pipeline
Which switches between the first position and the second position, so that the switching of the position of the second control unit is controlled by exterior line
System, so as to the discharge capacity that external control selectively controls double-action variable displacement motor can be passed through.
The present invention the electromechanical actuator with antiaircraft acupoints as choke valve is provided with quintafurcation pipeline, when
When pressure in first working line and the second working line is excessive, the flow into the hydraulic oil in rodless cavity is effectively prevent
It is excessive and exchange fuel-economizing cylinder and produce impact, and then double-action variable displacement motor discharge capacity is become suddenly big and is produced impact to load, make double
To variable displacement motor, under steady mobile piston rod, discharge capacity uniformly increases.
The electromechanical actuator with antiaircraft acupoints of the present invention is due to arranging on the return line of the first control unit
Overflow valve, when the working line of larger pressure is used to drive double-action variable displacement motor, overflow valve can make the work of less pressure
Make pipeline with certain pressure can fuel tank, so as to effectively prevent the working line of less pressure because the flow of oil sump tank is excessive so that
Double-action variable displacement motor produces hole, and then generation is vibrated and damaged.
Description of the drawings
Fig. 1 is the structural representation of the electromechanical actuator with antiaircraft acupoints of the present invention.
In figure：
1- double-action variable displacement motors；The first working lines of 2-；The second working lines of 3-；The first control units of 4-；First point of 5-
Bye-pass；6- second branched pipes road；The second control units of 7-；8- Three branched pipes road；The 4th branch lines of 9-；10- the 3rd is controlled
Unit processed；11- control pipers；12- quintafurcation pipelines；The 6th branch lines of 13-；14- adjusts oil cylinder；15- fuel tanks；101- is oblique
Disk；16- the first external control pipelines；17- the second external control pipelines；18- choke valves；19- overflow valves.
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 electromechanical actuator with antiaircraft acupoints, for basis
The discharge capacity of operating pressure or operating pressure difference control double-action variable displacement motor 1, should include with the electromechanical actuator of antiaircraft acupoints：
First hydraulic pipeline；Second hydraulic pipeline；Double-action variable displacement motor 1, which is used for and first fluid pressure line and institute
State the connection of the second fluid pressure line；First control unit 4, which is passed through the first branch line 5 and is connected with first fluid pressure line, is led to
Cross second branched pipe road 6 to connect with second fluid pressure line；First control unit 4 has makes first branch line
5 and second branched pipe road 6 block first position, with blocking first branch line 5, and make second branch
The second position of the backflow fuel tank 15 of pipeline 6 and have and make first branch line 5 backflow fuel tank 15, and make described second point
The 3rd position that bye-pass 6 is blocked；Second control unit 7, which is passed through Three branched pipe road 8 and is connected with first fluid pressure line
It is logical, connected with second fluid pressure line by the 4th branch line 9；Second control unit 7 has makes the 3rd branch
Pipeline 8 blocks and makes the first position of the conducting of the 4th branch line 9 and the Three branched pipe road 8 is turned on and is made institute
State the second position that the 4th branch line 9 is blocked；Adjust oil cylinder 14, it include cylinder body, the piston being arranged in the cylinder body with
And one end is connected with the piston, the work that the other end is connected with the swash plate 101 of the double-action variable displacement motor 1 after stretching out the cylinder body
Plunger shaft in the cylinder body is divided into rod chamber and rodless cavity by stopper rod, the piston；The outlet of second control unit 7
It is connected with control piper 11, the control piper 11 is divided into quintafurcation pipeline 12 and the 6th branch line 13, described 5th point
Bye-pass 12 is connected with the rodless cavity, and the 6th branch line 13 is connected with the rod chamber；3rd control unit 10, its
It is arranged on the quintafurcation pipeline 12, the 3rd control unit 10 has makes the control piper 11 with described without bar
First position and block the control piper 11 and make the second position of the rodless cavity backflow fuel tank 15 that chamber connects, its
In：Second control unit 7 has two second unit control mouths, two second unit control mouths respectively with first outside
Portion's control piper 16 is connected with the second external control pipeline 17, so that when the pressure in the first external control pipeline 16 is more than
During pressure in the second external control pipeline 17, second control unit 7 is in the second position, outside described first
When pressure in control piper 16 is less than the pressure in the second external control pipeline 17, second control unit 7 is in
The second 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 position；Choke valve is provided with quintafurcation pipeline 12 between the rodless cavity and the 3rd control unit 10
18；Overflow valve 19 is provided with the return line of first control unit 4.
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 are 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, make the first external control pipeline
Pressure of 16 pressure more than the second external control pipeline 17, so that the second control unit 7 switches to the second position, so that
Hydraulic oil in first working line 2 is entered in control piper 11 by the second control unit 7, the hydraulic oil in control piper 11
Unit the 3rd is caused to switch to the second position by the 3rd unit control mouth, so that the hydraulic oil oil sump tank 15 in rodless cavity,
And quintafurcation pipeline 12 is truncated, the hydraulic oil in control piper 11 enter rod chamber through the 6th branch line 13 so that
Direction movement of the piston rod towards the inclination angle increase of the swash plate 101 for making double-action variable displacement motor 1, so that the row of double-action variable displacement motor 1
Amount increase, the situation for increasing 2 pressure of the first working line of adaptation increase because of 2 pressure of the first working line so as to effectively prevent
Situation that is big and causing double-action variable displacement motor 1 to damage occurs.Correspondingly, when the second working line 3 is more than the first working line 2
When, the first control unit 4 is in the second position, and the second working line 3 is blocked by the first control unit 4, in the first working line 2
Hydraulic oil flow back to fuel tank 15, double-action variable displacement motor 1 rotates to drive load in the opposite direction.And when 3 mistake of the second working line
When big, the pressure of the second external control pipeline 17 is made more than the pressure of the first external control pipeline 16, 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 Unit the 3rd to switch to the second position by the 3rd unit control mouth, so that
Hydraulic oil oil sump tank 15 in rodless cavity, and quintafurcation pipeline 12 is truncated, the hydraulic oil in control piper 11 is through the 6th
Branch line 13 is into rod chamber so that piston rod is moved towards the direction of the inclination angle increase of the swash plate 101 for making 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 3 pressure of the second working line of adaptation, so as to effectively prevent
Having stopped causes the situation that double-action variable displacement motor 1 is damaged to occur because 3 pressure of the second working line increases.
It follows that the second control unit 7 and the 3rd control unit 10 and regulation oil cylinder 14 effectively can be prevented because of work
Make that loine pressure is too high and impact to double-action variable displacement motor 1.
Second control unit 7 of the present invention is according to the first external control pipeline 16 and the pressure of the second external control pipeline 17
Official post its switch between the first position and the second position so that the switching of the position of the second control unit 7 receive exterior line
Control, selectively control the discharge capacity of double-action variable displacement motor 1 so as to external control can be passed through.
The electromechanical actuator with antiaircraft acupoints of the present invention is due to being provided with choke valve on quintafurcation pipeline 12
18, when the pressure in the first working line 2 and the second working line 3 is excessive, effectively prevent into the hydraulic pressure in rodless cavity
The flow of oil is excessive and exchange fuel-economizing cylinder 14 and produce impact, and then 1 discharge capacity of double-action variable displacement motor is become suddenly big and is produced to load
Raw impact, makes the discharge capacity under steady mobile piston rod of double-action variable displacement motor 1 uniformly increase.
The electromechanical actuator with antiaircraft acupoints of the present invention is due to arranging on the return line of the first control unit 4
Overflow valve 19, when the working line of larger pressure is used to drive double-action variable displacement motor 1, overflow valve 19 can make less pressure
Working line with certain pressure can fuel tank 15, so as to effectively prevent the working line of less pressure because of the flow of oil sump tank 15
It is excessive so that double-action variable displacement motor 1 produce hole, and then produce vibrate and damage.
Preferably, first control unit 4 has two first module control mouths, the first module control mouth difference
Connect with first branch line 5 and the second branched pipe road 6, so that when pressure in first branch line 5 etc.
During 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 position, 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 the exemplary embodiment of the present invention, is not used in the restriction present invention, protection scope of the present invention
It is defined by the claims.Those skilled in the art can be made respectively to the present invention in the essence and protection domain of 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 electromechanical actuator with antiaircraft acupoints, it is characterised in that include：
First hydraulic pipeline；
Second hydraulic pipeline；
Double-action variable displacement motor, which is used to be connected with first fluid pressure line and second fluid pressure line；
First control unit, which is passed 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 make the second branched pipe road flow back the second of fuel tank
Putting and having makes first branch line backflow fuel tank, and makes the 3rd position that the second branched pipe road blocks；
Second control unit, which is passed 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 make the Three branched pipe road turn on and make the second that the 4th branch line is blocked that pipeline is turned on
Put；
Oil cylinder is adjusted, which 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
The piston rod being connected with the swash plate of the double-action variable displacement motor after going out 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, which is arranged on the quintafurcation pipeline, and the 3rd control unit has makes the control pipe
First position that road is connected 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 two second unit control mouths, two second unit control mouths respectively with first outside
Portion's control piper and the second external control pipeline connection, so that when the pressure in the first external control pipeline is more than described the
During pressure in two external control pipelines, second control unit is in the second position, when the first external control pipeline
When interior pressure is less than the pressure in the second external control pipeline, second control unit is in the second position；
3rd control unit has a 3rd unit control mouth, and the 3rd unit control mouth is connected with the control piper
Logical, when the pressure in the control piper increases, the 3rd control unit switches to the second position from first position；
Choke valve is provided with quintafurcation pipeline between the rodless cavity and the 3rd control unit；
Overflow valve is provided with the return line of first control unit.
2. the electromechanical actuator with antiaircraft acupoints according to claim 1, it is characterised in that first control is single
Unit has two first module control mouths, the first module control mouth respectively with first branch line and described second point
Bye-pass is connected, so that when the pressure in first branch line is equal to the pressure in the second branched pipe road, it is described
First control unit is in first position, when the pressure in first branch line is more than the pressure in the second branched pipe road
During power, first control unit is in the second position, when the pressure in first branch line is less than second branch
During pressure in pipeline, first control unit is in the 3rd position.
3. the electromechanical actuator with antiaircraft acupoints according to claim 1, it is characterised in that first control is single
Unit is three position three-way change valve.
4. the electromechanical actuator with antiaircraft acupoints according to claim 1, it is characterised in that the 3rd control is single
Unit is two position three way directional control valve.
5. the electromechanical actuator with antiaircraft acupoints according to claim 4, it is characterised in that the 3rd control is single
Unit is proportional reversing valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611195420.5A CN106523453A (en) | 2016-12-22 | 2016-12-22 | Electromechanical actuator having cavity prevention function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611195420.5A CN106523453A (en) | 2016-12-22 | 2016-12-22 | Electromechanical actuator having cavity prevention function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106523453A true CN106523453A (en) | 2017-03-22 |
Family
ID=58340448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611195420.5A Pending CN106523453A (en) | 2016-12-22 | 2016-12-22 | Electromechanical actuator having cavity prevention function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106523453A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5709282A (en) * | 1995-03-31 | 1998-01-20 | Fiat-Hatachi Excavators S.P.A. | Traveling control system for hydraulically driven vehicle |
| CN1570346A (en) * | 2004-05-09 | 2005-01-26 | 浙江大学 | Enclosed return circuit hydraulic beam-pumping unit utilizing frequency conversion technology |
| 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 |
| CN201363332Y (en) * | 2009-03-05 | 2009-12-16 | 中国矿业大学 | Large inertia variable frequency volume bypass throttling speed governing system |
| CN203639965U (en) * | 2013-10-16 | 2014-06-11 | 天津柳工机械有限公司 | Hydraulic device for traveling of bulldozer |
-
2016
- 2016-12-22 CN CN201611195420.5A patent/CN106523453A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5709282A (en) * | 1995-03-31 | 1998-01-20 | Fiat-Hatachi Excavators S.P.A. | Traveling control system for hydraulically driven vehicle |
| CN1570346A (en) * | 2004-05-09 | 2005-01-26 | 浙江大学 | Enclosed return circuit hydraulic beam-pumping unit utilizing frequency conversion technology |
| 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 |
| CN201363332Y (en) * | 2009-03-05 | 2009-12-16 | 中国矿业大学 | Large inertia variable frequency volume bypass throttling speed governing system |
| CN203639965U (en) * | 2013-10-16 | 2014-06-11 | 天津柳工机械有限公司 | Hydraulic device for traveling of bulldozer |
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