CN106089868B - energy recovery pump, road vehicle and engineering machinery - Google Patents
energy recovery pump, road vehicle and engineering machinery Download PDFInfo
- Publication number
- CN106089868B CN106089868B CN201610643419.8A CN201610643419A CN106089868B CN 106089868 B CN106089868 B CN 106089868B CN 201610643419 A CN201610643419 A CN 201610643419A CN 106089868 B CN106089868 B CN 106089868B
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- pump
- motor
- energy recovery
- swash plate
- pivot angle
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Classifications
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- 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
- F15B21/14—Energy-recuperation means
-
- 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
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/88—Control measures for saving energy
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Reciprocating Pumps (AREA)
Abstract
The present invention relates to a kind of energy recovery pump, road vehicle and engineering machinery, wherein, energy recovery pump includes：Oil circuit, pump motor and the variable cylinder for controlling the swash plate pivot angle of pump motor are controlled, control oil circuit can change the swash plate pivot angle of pump motor to variable oil supply cylinder, to realize that pump motor switches between pump condition and motor operating conditions.Energy recovery pump by select pump motor and set for control pump motor swash plate pivot angle variable cylinder, control oil circuit can realize pump motor free switching between pump condition and motor operating conditions to variable oil supply cylinder to change the swash plate pivot angle of pump motor, energy recovery pump is enabled pump can be used as to use output hydraulic pressure, the hydraulic energy transfer that will be inputted can be used to recycle for mechanical energy as motor again, it is and easy to control quick, cost is relatively low, has higher exploitativeness.
Description
Technical field
The present invention relates to a kind of rotating machine art field more particularly to energy recovery pump, road vehicle and engineering machinery.
Background technology
For engineering machinery since application is wide, quantity is more, the energy, the pollutant of discharge consumed generates environment serious shadow
It rings, one of efficient, energy saving target for having become domestic and international project machinery new-product development is realized to it.In current hydraulic pressure member
In part, existing variable pump can only realize pumping function, swash plate can only be controlled to change in the range of 0~-a ° of pivot angle, it is impossible to realize horse
Up to function, it is impossible to realize energy regenerating and utilize function.
Energy saving research based on Energy Recovery Technology needs the plunger pump of a specific function, in high pressure hydraulic fluid port and main shaft
In the case that rotation direction is constant, pump can be used as using output hydraulic pressure energy and be used as motor by accumulator hydraulic energy transfer
It is recycled for mechanical energy.
The content of the invention
It, can the technical problem to be solved by the present invention is to provide a kind of energy recovery pump to overcome more than technological deficiency
It uses, and can be used as motor as pump.
In order to solve the above technical problems, the present invention provides a kind of energy recovery pump, including：Control oil circuit, pump motor
And the variable cylinder for controlling the swash plate pivot angle of pump motor, control oil circuit can change the oblique of pump motor to variable oil supply cylinder
Disk pivot angle, to realize that pump motor switches between pump condition and motor operating conditions.
Preferably, pump motor is oblique tray type axial plunger piston variable pump.
Further, variable cylinder has motor displacement maximum travel position, zero delivery travel position and pumpage maximum
Travel position；
Under pump condition, the travel position of the piston of variable cylinder is in zero delivery travel position and pumpage range position
Between putting；
Under motor operating conditions, the travel position of the piston of variable cylinder is in zero delivery travel position and motor displacement maximum row
Between journey position.
Further, the proportioning valve being arranged on control oil circuit is further included；
Under pump condition, proportioning valve is shown in a fully open operation；
Under motor operating conditions, proportioning valve can change control oil circuit to the fuel delivery of variable cylinder to realize the motor of pump motor
Discharge capacity is adjustable.
Further, proportioning valve is electromagnetic proportional valve, and electromagnetic proportional valve is shown in a fully open operation in dead electricity.
Further, rodless cavity fuel feeding of the oil circuit to variable cylinder is controlled, the piston rod of variable cylinder is used to control pump motor
Swash plate pivot angle, piston rod are equipped with swash plate pivot angle and feed back part, and being equipped with swash plate pivot angle between swash plate pivot angle feedback part and proportioning valve feeds back
Spring；
Under pump condition, swash plate pivot angle feedback spring is in pre-pressing state, so that proportioning valve is equal in the case where obtaining electric and dead electricity
It is shown in a fully open operation；
In the case where motor operating conditions and pump motor are in maximum pump discharge state, swash plate pivot angle feedback spring is in free state.
Further, resetting apparatus is further included, under the independent action of resetting apparatus, pump motor is in pump maximum pump discharge position
It puts.
Further, the load-sensitive flow control valve and pressure shut-off valve being arranged on control oil circuit, load are further included
The load feedback end end of sensitive flow control valve is communicated with load feedback mouth, controls the control fluid of oil circuit by the work of pump motor
Oil circuit provides.
Further, shuttle valve and constant pressure oil source oil inlet, the first oil inlet of shuttle valve and the working oil of pump motor are further included
Road communicates, and the second oil inlet of shuttle valve is communicated with constant pressure oil source oil inlet, and control oil circuit is communicated with the oil outlet of shuttle valve.
The present invention also provides a kind of road vehicle, including above-mentioned energy recovery pump.
The present invention also provides a kind of engineering machinery, including above-mentioned energy recovery pump.
As a result, based on above-mentioned technical proposal, energy recovery pump of the present invention is by selecting pump motor and setting to control pump
The variable cylinder of the swash plate pivot angle of motor, control oil circuit can realize pump to variable oil supply cylinder to change the swash plate pivot angle of pump motor
Motor free switching between pump condition and motor operating conditions so that energy recovery pump can be used as pump using output hydraulic pressure energy and
The hydraulic energy transfer that will be inputted can be used to recycle for mechanical energy as motor, and it is easy to control quick, and cost is relatively low, has
Higher exploitativeness.Road vehicle of the present invention and engineering machinery also correspondingly have above-mentioned advantageous effects.
Description of the drawings
Attached drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair
Bright schematic description and description is only used for explaining the present invention, does not constitute improper limitations of the present invention.In the accompanying drawings：
Fig. 1 is the principle schematic diagram of energy recovery pump embodiment of the present invention.
Specific embodiment
Below by drawings and examples, technical scheme is described in further detail.
The present invention specific embodiment be for the ease of to the present invention design, solve the technical issues of, composition skill
The technical characteristic of art scheme and the technique effect brought have further description.It should be noted that for these embodiment party
The explanation of formula does not form limitation of the invention.In addition, the technical characteristic involved in following embodiments of the present invention is only
Conflict is not formed each other can be combined with each other.
In the schematical embodiment of energy recovery pump one of the present invention, as shown in Figure 1, energy recovery pump includes：Control
Oil circuit, pump motor 2 and the variable cylinder 3 for controlling the swash plate pivot angle of pump motor 2, control oil circuit can be to 3 fuel feeding of variable cylinder
Change the swash plate pivot angle of pump motor 2, to realize that pump motor 2 switches between pump condition and motor operating conditions.
In the schematical embodiment, by the way that pump motor 2 and setting is selected to control the swash plate pivot angle of pump motor
Variable cylinder 3, pump motor are that one kind can realize pumping function and realize the special Hydraulic Elements of motor function, control oil circuit energy
It is enough to realize pump motor 2 between pump condition and motor operating conditions freely to change the swash plate pivot angle of pump motor 2 to 3 fuel feeding of variable cylinder
Switching so that energy recovery pump can be used as pump using output hydraulic pressure energy and the hydraulic energy that will be inputted is used to turn as motor
Mechanical energy recycling is turned to, and it is easy to control quick, and cost is relatively low, has higher exploitativeness.Wherein, pump motor 2 is excellent
Selection of land is oblique tray type axial plunger piston variable pump, can be easily real by the swash plate pivot angle for changing oblique tray type axial plunger piston variable pump
Existing free switching of the pump motor 2 between pump condition and motor operating conditions, for example, when swash plate pivot angle is swung in the range of 0 °~-a °,
Pump motor 2 is in pump condition；When swash plate pivot angle is swung in the range of 0 °~a °, pump motor 2 is in motor operating conditions.Wherein-a ° and
The maximum of a ° of respectively swash plate pivot angle bears swinging and maximum positive swinging.Wherein, energy recovery pump preferably also comprises reset
Device 1, under the independent action of resetting apparatus 1, pump motor 2 is in pump displacement, and so setting can ensure to pump horse
It is located at pump displacement in the initial state up to 2.Resetting apparatus 1 can be as illustrated in fig. 1 by an independent oil cylinder
Composition is provided with the resetting spring for promoting piston in the in-oil cylinder rodless cavity；Can also be by being arranged in variable cylinder 3
Resetting spring forms, and can also be other structures form certainly, will not enumerate herein.
In energy recovery pump one of the present invention specifically or in preferred embodiment, as shown in Figure 1, variable cylinder 3 has motor
Discharge capacity maximum travel position A, zero delivery travel position D and pumpage maximum travel position C；Under pump condition, variable cylinder 3
The travel position of piston is between zero delivery travel position D and pumpage maximum travel position C；Under motor operating conditions, variable
The travel position of the piston of cylinder 3 is between zero delivery travel position D and motor displacement maximum travel position A.Motor is set to arrange
Amount maximum travel position A, zero delivery travel position D and pumpage maximum travel position C can be convenient for accordingly adjusting swash plate
The position of pivot angle, in the specific embodiment, piston is from pumpage maximum travel position C to the shifting of zero delivery travel position D
Dynamic to correspond to swing of the swash plate pivot angle at-a °~0 °, piston is from zero delivery travel position D to motor displacement maximum travel position A
Between movement correspond to swing of the swash plate pivot angle at 0 °~a °.
In order to realize that motor displacement is adjustable under motor operating conditions, in a preferred embodiment, as shown in Figure 1, energy
Recovery pump further includes the proportioning valve 6 being arranged on control oil circuit；Under pump condition, proportioning valve 6 is shown in a fully open operation；In motor work
Under condition, proportioning valve 6 can change control oil circuit to the fuel delivery of variable cylinder 3 to realize that the motor displacement of pump motor 2 is adjustable.Wherein
It is highly preferred that proportioning valve 6 is electromagnetic proportional valve, electromagnetic proportional valve is shown in a fully open operation in dead electricity.When electromagnetic proportional valve obtain it is electric
When, by controlling fuel delivery of the i.e. controllable control oil circuit of size of current to variable cylinder 3, the size for then changing swash plate pivot angle is come
Adjust the motor displacement of pump motor 2.Wherein, in order to ensure the safe to use of motor operating conditions, pump motor 2 during electromagnetic proportional valve dead electricity
In motor maximum pump discharge, increase control electric current discharge capacity and reduce, is i.e. motor displacement and control electric current is inversely proportional.
The control to the swash plate pivot angle of pump motor 3 how is realized for variable cylinder 3, in a specific or preferred embodiment
In, as shown in Figure 1, control rodless cavity fuel feeding of the oil circuit to variable cylinder 3, the piston rod of variable cylinder 3 is used to control the oblique of pump motor 2
Disk pivot angle, piston rod are equipped with swash plate pivot angle and feed back part 8, and being equipped with swash plate pivot angle between swash plate pivot angle feedback part 8 and proportioning valve 6 feeds back
Spring 7；Under pump condition, swash plate pivot angle feedback spring 7 is in pre-pressing state, so that proportioning valve 6 is equal in the case where obtaining electric and dead electricity
It is shown in a fully open operation；In the case where motor operating conditions and pump motor 2 are in maximum pump discharge state, swash plate pivot angle feedback spring 7 is in freely
State.It can so ensure that swash plate pivot angle feedback spring 7 does not allow to be relaxed to disengaging spring under pump condition or motor operating conditions
Seat and electric proportional valve core, swash plate pivot angle feedback spring 7 is in pre-pressing state under pump condition, swash plate during motor operating conditions maximum pump discharge
Pivot angle feedback spring 7 is in free state.Under motor operating conditions, swash plate pivot angle feedback spring 7 is by freedom when increasing control electric current
State is completed control of the pump motor 2 from maximum pump discharge to minimum injection rate, is then arbitrarily arranged under pump condition to pre-pressing state change
The pre-pressing force of the swash plate pivot angle feedback spring 7 of amount is by more than the maximum thrust of electromagnet, therefore proportioning valve 6 is unexpected under pump condition
It electric must can not also commutate, i.e., proportioning valve 6 is shown in a fully open operation always, avoids the influence to pump discharge control.The present invention passes through
Electromagnetic Control realizes the functional shift of pump condition and motor operating conditions, does not interfere with each other.
The load-sensitive pressure difference of pump motor is controlled under pump condition for how to realize, in an improved embodiment
In, as shown in Figure 1, energy recovery pump further includes the load-sensitive flow control valve 5 and pressure cut off being arranged on control oil circuit
Valve 4, the load feedback end end of load-sensitive flow control valve 5 are communicated with load feedback mouth X, control the control fluid of oil circuit by pumping
The working oil path of motor 2 provides, that is, the actuator port B of pump motor 2 is communicated with control oil circuit.As shown in Figure 1, pump motor 2 goes out
The pressure oil of mouth reaches load-sensitive flow control valve 5 and pressure shut-off valve 4 by proportioning valve 6, passes through load-sensitive flow control
The feedback pressure difference that valve 5 processed compares between pump discharge pressure and load feedback mouth X adjusts swash plate angle in the range of 0~-a °
It swings, to meet system flow demand；When pump discharge pressure, which reaches pressure shut-off valve 4, sets pressure, pressure shut-off valve 4 commutates
To left position, the minimum injection rate position that pump motor 2 is in pump, no longer output flow are adjusted, ensures 2 non-overloading of pump motor.Wherein, bear
The control terminal for carrying sensitive flow control valve 5 and pressure shut-off valve 4 is communicated with control oil circuit, 5 He of load-sensitive flow control valve
The oil inlet of pressure shut-off valve 4 is also communicated with control oil circuit, and the load feedback end of load-sensitive flow control valve 5 and pressure are cut
The oil outlet end of disconnected valve 4 is communicated with the unloading port L of energy recovery pump, and is equipped with damping on its draining oil circuit to ensure that draining is steady
Pressure.
To ensure also realize Variable Control in the case where actuator port B pressure is relatively low, energy recovery pump can be with excellent
Selection of land includes shuttle valve 9 and constant pressure oil source oil inlet G, and the first oil inlet of shuttle valve 9 is communicated with the working oil path of pump motor 2, shuttle valve 9
The second oil inlet communicated with constant pressure oil source oil inlet G, control oil circuit communicated with the oil outlet of shuttle valve 9.Constant pressure oil sources is from G
Mouth introduces the Variable Control for motor operating conditions, ensures the reliability that pump motor 2 works.
Illustrate that the course of work of energy recovery pump is as follows below with embodiment shown in FIG. 1：
Original state is the displacement of pump, when 6 dead electricity of proportioning valve, pump motor 2 are without input speed, variable cylinder 3
The fluid of inner cavity passes sequentially through pressure shut-off valve 4, load-sensitive flow control valve 5 connects pressure release with drain tap L, and pump motor 2 is logical
Cross-a ° of the displacement that resetting apparatus 1 promotes swash plate to be in pump.
The acquiescence operating mode of energy recovery pump is pump condition, when 6 dead electricity of proportioning valve, 2 input speed of pump motor, pump motor 2
It pumps from hydraulic fluid port S, the pressure oil that pump motor 2 exports reaches load-sensitive flow control valve 5 and pressure shut-off valve by proportioning valve 6
4, pump discharge pressure is compared by load-sensitive flow control valve 5 and adjusts swash plate angle with load feedback mouth X feedback pressures difference
It is swung in the range of 0~-a °, to meet system flow demand；When pump discharge pressure, which reaches pressure shut-off valve 4, sets pressure,
Pressure shut-off valve 4 commutates to left position, adjusts oil pump and is in minimum injection rate position, no longer output flow, ensures oil pump non-overloading.
The switching operating mode of energy recovery pump is motor operating conditions, after load feedback mouth X feeds back oil circuit pressure release, from actuator port
The high pressure oil that B is passed through acts on load-sensitive flow control valve 5 by proportioning valve 6 and makes its commutation to left position, thus by than
The B mouths high pressure oil of example valve 6 connects simultaneously successively by load-sensitive flow control valve 5, pressure shut-off valve 4 with the inner cavity of variable cylinder 3
Pressure, swash plate is by from negative-a ° of pendulum of maximum pendulum angle to a ° positive of maximum pendulum angle, and energy recovery pump switches to horse from pump condition at this time
Can be mechanical energy by hydraulic energy transfer up to operating mode maximum pump discharge state.When proportioning valve 6 obtains electric and changes control electric current, cooperation is oblique
Disk pivot angle feedback spring 7, swash plate pivot angle feedback part 8 can be realized swash plate pivot angle and accurately controlled in the range of positive 0~a ° of pivot angle
System, to realize that motor displacement is adjusted.It is fed back by position of the swash plate of pump motor 2 in the range of positive pivot angle, realizes motor work
The discharge capacity ratio control of condition.
Energy recovery pump of the present invention is applied especially to the Brake energy recovery of road running class vehicle or construction machinery product
Hydraulic system or other potential energy (or inertia energy) energy-recuperation systems.
The present invention also provides a kind of road vehicle, including above-mentioned energy recovery pump.Due to energy regenerating of the present invention
Pump can be used as pump to use and used as motor, and correspondingly, road vehicle of the present invention also there is above-mentioned Advantageous to imitate
Fruit, details are not described herein.
The present invention also provides a kind of engineering machinery, including above-mentioned energy recovery pump.Due to energy regenerating of the present invention
Pump can be used as pump to use and used as motor, and correspondingly, engineering machinery of the present invention also there is above-mentioned Advantageous to imitate
Fruit also repeats no more herein.
Above in association with embodiment be described in detail for embodiments of the present invention, but the present invention is not limited to be retouched
The embodiment stated.For example, the proportioning valve 6 of pump motor 2 is placed on the load-sensitive flow control valve 5 and pressure of pump by the present invention program
The arranged in series made above of power stop valve 4, after proportioning valve 6 is placed on load-sensitive flow control valve 5 and pressure shut-off valve 4
Face or the intermediate arranged in series that carries out have same effect.For a person skilled in the art, do not departing from the present invention's
In the case of principle and connotation these embodiments are carried out with a variety of variations, modification, equivalence replacement and modification to still fall within
Within protection scope of the present invention.
Claims (10)
1. a kind of energy recovery pump, which is characterized in that including：Control oil circuit, pump motor (2) are arranged on the control oil circuit
Proportioning valve (6) and variable cylinder (3) for controlling the swash plate pivot angle of the pump motor (2), the control oil circuit can be to
Variable cylinder (3) fuel feeding changes the swash plate pivot angle of the pump motor (2), with realize the pump motor (2) in pump condition and
Switch between motor operating conditions；
The control rodless cavity fuel feeding of the oil circuit to the variable cylinder (3), the piston rod of the variable cylinder (3) are described for controlling
The swash plate pivot angle of pump motor (2), the piston rod are equipped with swash plate pivot angle feedback part (8), the swash plate pivot angle feedback part (8) and institute
It states and swash plate pivot angle feedback spring (7) is equipped between proportioning valve (6)；
Under the pump condition, the swash plate pivot angle feedback spring (7) is in pre-pressing state, so that at the proportioning valve (6)
In full-gear；
In the case where the motor operating conditions and the pump motor (2) are in maximum pump discharge state, at the swash plate pivot angle feedback spring (7)
In free state.
2. energy recovery pump according to claim 1, which is characterized in that the pump motor (2) is cam-type axial piston
Variable pump.
3. energy recovery pump according to claim 1, which is characterized in that the variable cylinder (3) has motor displacement maximum
Travel position (A), zero delivery travel position (D) and pumpage maximum travel position (C)；
Under the pump condition, the travel position of the piston of the variable cylinder (3) is in the zero delivery travel position (D) and institute
It states between pumpage maximum travel position (C)；
Under the motor operating conditions, the travel position of the piston of the variable cylinder (3) be in the zero delivery travel position (D) and
Between the motor displacement maximum travel position (A).
4. energy recovery pump according to claim 1, which is characterized in that
Under the pump condition, the proportioning valve (6) is shown in a fully open operation；
Under the motor operating conditions, the proportioning valve (6) can change fuel delivery of the control oil circuit to the variable cylinder (3)
To realize that the motor displacement of the pump motor (2) is adjustable.
5. energy recovery pump according to claim 1, which is characterized in that the proportioning valve (6) is electromagnetic proportional valve, described
Electromagnetic proportional valve is shown in a fully open operation in dead electricity.
6. energy recovery pump according to claim 1, which is characterized in that further include resetting apparatus (1), reset dress described
Under the independent action for putting (1), the pump motor (2) is in pump displacement.
7. energy recovery pump according to claim 1, which is characterized in that further include and be arranged on bearing on the control oil circuit
Sensitive flow control valve (5) and pressure shut-off valve (4) are carried, the load feedback end of the load-sensitive flow control valve (5) is with bearing
It carries feedback port (X) to communicate, the control fluid of the control oil circuit is provided by the working oil path of the pump motor (2).
8. energy recovery pump according to claim 1, which is characterized in that further include shuttle valve (9) and constant pressure oil source oil inlet
(G), the first oil inlet of the shuttle valve (9) is communicated with the working oil path of the pump motor (2), the shuttle valve (9) second into
Hydraulic fluid port is communicated with the constant pressure oil source oil inlet (G), and the control oil circuit is communicated with the oil outlet of the shuttle valve (9).
9. a kind of road vehicle, which is characterized in that including claim 1~8 any one of them energy recovery pump.
10. a kind of engineering machinery, which is characterized in that including claim 1~8 any one of them energy recovery pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610643419.8A CN106089868B (en) | 2016-08-09 | 2016-08-09 | energy recovery pump, road vehicle and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610643419.8A CN106089868B (en) | 2016-08-09 | 2016-08-09 | energy recovery pump, road vehicle and engineering machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106089868A CN106089868A (en) | 2016-11-09 |
| CN106089868B true CN106089868B (en) | 2018-05-18 |
Family
ID=57455413
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610643419.8A Active CN106089868B (en) | 2016-08-09 | 2016-08-09 | energy recovery pump, road vehicle and engineering machinery |
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| Country | Link |
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| CN (1) | CN106089868B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109826836B (en) * | 2019-01-11 | 2020-07-24 | 徐州工业职业技术学院 | Intelligent variable pump and hydraulic control system |
| CN112555236A (en) * | 2020-11-30 | 2021-03-26 | 三一海洋重工有限公司 | Potential energy recovery system, control method thereof and engineering equipment |
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| CN105134578A (en) * | 2015-07-30 | 2015-12-09 | 徐州重型机械有限公司 | Plunger pump with energy recycling function |
| AU2016203112A1 (en) * | 2007-01-19 | 2016-06-02 | Rds Technologies Pty Ltd | A hydraulic circuit for a regenerative drive assembly |
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| AU2016203112A1 (en) * | 2007-01-19 | 2016-06-02 | Rds Technologies Pty Ltd | A hydraulic circuit for a regenerative drive assembly |
| 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 |
| CN104176639A (en) * | 2014-08-13 | 2014-12-03 | 徐州重型机械有限公司 | Constant-pressure-variable network hydraulic system, hydraulic control method and crane |
| CN104847613A (en) * | 2015-04-13 | 2015-08-19 | 徐州重型机械有限公司 | Swash plate axial hydraulic plunger pump or motor |
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| CN106089868A (en) | 2016-11-09 |
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