CN100538066C - Electrohydraulic valve variable torque is joined the quantitative plunger piston hydraulic motor of oil type rotating cylinder cartridge type - Google Patents
Electrohydraulic valve variable torque is joined the quantitative plunger piston hydraulic motor of oil type rotating cylinder cartridge type Download PDFInfo
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- CN100538066C CN100538066C CNB2007100693151A CN200710069315A CN100538066C CN 100538066 C CN100538066 C CN 100538066C CN B2007100693151 A CNB2007100693151 A CN B2007100693151A CN 200710069315 A CN200710069315 A CN 200710069315A CN 100538066 C CN100538066 C CN 100538066C
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Abstract
The present invention relates to oil hydraulic motor, aim to provide a kind of electrohydraulic valve variable torque and join the quantitative plunger piston hydraulic motor of oil type rotating cylinder cartridge type.This motor comprises motor casing, swash plate, switch changeable torque valve-controlled oil distributing components, electromechanical converter, driving amplifier, brush, inductance loop and electronic controller; The switch changeable torque valve-controlled oil distributing components comprises the oil distributing valve group, and the oil distributing valve group comprises speed-sensitive switch high-pressure oil feed valve and speed-sensitive switch oil extraction/Fill valve; Each valve all connects electromechanical converter, and each electromechanical converter all connects driving amplifier; The entry end of speed-sensitive switch high-pressure oil feed valve links to each other with the pressure hydraulic fluid port, and outlet end links to each other with the plunger cavity of plunger; Spring chamber one end of speed-sensitive switch oil extraction/Fill valve links to each other with the plunger cavity of plunger, and the other end links to each other with return opening.The present invention has realized that switch becomes moment of torsion control, has saved a large amount of energy consumptions; Valve-controlled oil distributing components is directly installed on the oil hydraulic motor plunger cylinder end face, has improved the driving pressure of oil hydraulic motor greatly.
Description
Technical field
The present invention relates to oil hydraulic motor, in particular, relate to a kind of electrohydraulic valve variable torque and join the quantitative plunger piston hydraulic motor of oil type rotating cylinder cartridge type.
Background technique
Thereby plunger piston hydraulic motor is to rely on pressure oil to act on to make motor output shaft obtain certain torque on the plunger, for plunger can alternately be communicated with pressure hydraulic fluid port and return opening, must adopt flow distribution apparatus, plunger piston hydraulic motor adopts valve plate distribution more at present, and the main devices that is adopted in the valve plate distribution is exactly an oil distribution casing.The similar plate valve of oil distribution casing, be fitted in the cylinder body end face that has assignment hole by plane with two arcs (" waist shape ") window, make cylinder body and oil distribution casing relative rotation on face perpendicular to motor drive shaft, the relative position of window on the oil distribution casing and the perforate of cylinder body end face is arranged according to certain rules, so that be in plunger case in fuel feeding or the oil extraction stroke can replace with the motor body on confession, oil extraction communicates, and guarantees isolation and sealing between each oil pocket.Because relative rotation between oil distribution casing and the cylinder body, therefore wearing and tearing form the end clearance mutually, the leakage of oil hydraulic motor is just mainly revealed from the end face between oil distribution casing and the cylinder body, and the end face of oil hydraulic motor is revealed the major obstacle that becomes present restriction oil hydraulic motor working pressure.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, provide a kind of electrohydraulic valve variable torque to join the quantitative plunger piston hydraulic motor of oil type rotating cylinder cartridge type.
In order to overcome the above problems, the present invention is achieved through the following technical solutions.
A kind of electrohydraulic valve variable torque is joined the quantitative plunger piston hydraulic motor of oil type rotating cylinder cartridge type, comprises motor casing and swash plate, also comprises switch changeable torque valve-controlled oil distributing components, electromechanical converter, driving amplifier, brush, inductance loop and electronic controller; Described switch changeable torque valve-controlled oil distributing components comprises plunger and oil distributing valve group, and described oil distributing valve group is made up of front shroud, valve plate, back shroud, speed-sensitive switch high-pressure oil feed valve and speed-sensitive switch oil extraction Fill valve; Described speed-sensitive switch high-pressure oil feed valve and speed-sensitive switch oil extraction Fill valve all are contained on the valve plate; The one side of described valve plate is close to described front shroud, and another side is close to described back shroud; Each speed-sensitive switch high-pressure oil feed valve and speed-sensitive switch oil extraction Fill valve all are connected with electromechanical converter, and each electromechanical converter all is connected with driving amplifier; Described speed-sensitive switch high-pressure oil feed valve and speed-sensitive switch oil extraction Fill valve are formed by push rod, spool, spring chamber and spring, and an end of described spool links to each other with push rod, and valve core upper sleeve has spring, and the other end of push rod is connected with electromechanical converter; Described electromechanical converter is used to control the motion of push rod;
The entry end of described speed-sensitive switch high-pressure oil feed valve links to each other with the pressure hydraulic fluid port, and outlet end links to each other with the plunger cavity of plunger; Spring chamber one end of described speed-sensitive switch oil extraction Fill valve links to each other with the plunger cavity of plunger, and the other end links to each other with return opening;
Described brush is made up of brush drive part and coupled brush receiving part, and the brush drive part is installed on the motor casing, is used to connect the external power supply of oil hydraulic motor; The brush receiving part is installed on the oil distributing valve group and with all driving amplifiers and links to each other, and is used to the driving amplifier power supply.
Described inductance loop is made up of inductance loop drive part and coupled inductance loop receiving part, and the inductance loop drive part is installed on the motor casing, is used to detect the angular signal of oil hydraulic motor; The inductance loop receiving part is installed on the oil distributing valve group and with driving amplifier and links to each other, and is used to transmit the signal that is transmitted by drive part and gives driving amplifier;
Described electronic controller is installed on the motor casing and with each inductance loop and links to each other, and provide the control signal of each threshold switch according to the angular signal that the inductance loop drive part obtains, fit like a glove to the phase angle of each valve control signal and the suction oil condition of each plunger of oil hydraulic motor guaranteeing.
As a kind of improvement, an end of described push rod passes back shroud and links to each other with motor converter.
As a kind of improvement, the receiving part of described inductance loop be 2N to plain conductor, every pair of corresponding connection with each driving amplifier of plain conductor is used for controlling the switch of each valve; Wherein N is a plunger quantity.
As a kind of improvement, the drive part of described inductance loop is made up of the sense cell that is evenly distributed on the ring; The quantity of sense cell is 2 times of required speed-sensitive switch signal dutyfactor resolution inverse, and each sense cell all links to each other with electronic controller.
A kind of electrohydraulic valve variable torque that is applicable to is joined the change torque control method of the quantitative plunger piston hydraulic motor of oil type rotating cylinder cartridge type, may further comprise the steps:
(1) inductance loop detects and obtains the hydraulic motor output shaft angle of swing, electronic controller is according to this angle of swing, by driving amplifier and electromechanical converter the high-speed switch valve in the oil distributing valve group is carried out switch control, make the phase angle of control signal and the angle of swing of oil hydraulic motor projecting shaft fit like a glove, guarantee that each plunger of oil hydraulic motor can both be discharged to return opening to hydraulic oil by speed-sensitive switch oil extraction Fill valve in the backhaul process, in the process process, can both pass through speed-sensitive switch high-pressure oil feed valve or speed-sensitive switch oil extraction Fill valve from pressure hydraulic fluid port or return opening oil suction;
(2) opening time of control speed-sensitive switch high-pressure oil feed valve, make corresponding plunger, have only part-time pressure oil can enter the plunger cavity of oil hydraulic motor, promote the plunger acting by speed-sensitive switch high-pressure oil feed valve in the oil suction stage;
All the other time plunger cavities in oil suction stage are the speed-sensitive switch oil extraction Fill valve by communicating with return opening all, directly from the return opening oil suction, replenish the cavity that plunger motion produces, but can not promote the plunger acting, guarantee that the average output torque of oil hydraulic motor is directly proportional with the dutycycle of displacement in whole plunger oil suction stroke of speed-sensitive switch high-pressure oil feed valve opening time section inner plunger;
(3) by real-time regulated to displacement dutycycle in whole plunger oil suction stroke of speed-sensitive switch high-pressure oil feed valve opening time section inner plunger, the average torque that is directly proportional with dutycycle of output has realized that electrohydraulic valve variable torque joins the change moment of torsion of the quantitative plunger piston hydraulic motor of oil type rotating cylinder cartridge type and control; Pass between dutycycle and the average torque is:
Dutycycle=X
Open* 2n=T/ (D * P * η
Machine* η
Valve),
Wherein: X
OpenBe the plunger displacement in the speed-sensitive switch high-pressure oil feed valve opening time section, n is the rotating speed of hydraulic motor output shaft, the average torque of T for needing to obtain, and D is the discharge capacity of oil hydraulic motor, P is the pressure of pressure hydraulic fluid port, η
MachineBe the mechanical efficiency of oil hydraulic motor, η
ValveEfficient for oil distributing valve group control plunger cavity.
Compared with prior art, the invention has the beneficial effects as follows:
(1) the present invention passes through the real-time regulated to displacement dutycycle in whole plunger oil suction stroke of speed-sensitive switch high-pressure oil feed valve opening time section inner plunger, and the average torque that output is directly proportional with dutycycle has realized that switch becomes moment of torsion control.
(2) when load torque is less, though its part plunger is in the oil suction district, but still from the return opening oil suction, and do not need pressure oil is wasted on the extra throttling control valve mouth, thereby saved a large amount of energy consumptions.
(3) valve-controlled oil distributing components of the present invention is directly installed on the oil hydraulic motor plunger cylinder end face, replaced traditional oil distribution casing, owing to do not had slide relative between valve-controlled oil distributing components and the oil hydraulic motor plunger cylinder end face, therefore improved the driving pressure of oil hydraulic motor greatly.
Description of drawings
Fig. 1 is a schematic representation of the present invention.
Fig. 2 is a valve-controlled oil distributing components structural representation of the present invention.
Fig. 3 is plunger position of the present invention and action flow chart.
Fig. 4 is a brush mounting structure schematic representation of the present invention.
Fig. 5 is an inductance loop mounting structure schematic representation of the present invention.
Among the figure, 1 electromechanical converter, 2 speed-sensitive switch high-pressure oil feed valves, 3 speed-sensitive switch oil extraction Fill valves, 4 plunger cylinders, 5 plunger cavities, 6 plungers, 7 brushes, 8 inductance loops, 9 electronic controllers, 10 projecting shafts, 11 rotating sleeves, 12 motor casings, 13 pressure hydraulic fluid ports, 14 return openings, 15 drain taps, 21 driving amplifiers, 28 front shrouds, 29 valve plates, 30 back shrouds, 31 speed-sensitive switch oil extraction Fill valve spring chambers, 32 speed-sensitive switch high-pressure oil feed valve inlet ends, 33 speed-sensitive switch high-pressure oil feed valve outlet port ends, 42 conductive hoops, 43 power supply supply lines, 56 sense cells, 57 accept device and control signal line.
Embodiment
In conjunction with the accompanying drawings, the present invention is described in detail below.
A kind of electrohydraulic valve variable torque is joined the quantitative plunger piston hydraulic motor of oil type rotating cylinder cartridge type, comprises motor casing and swash plate, also comprises switch changeable torque valve-controlled oil distributing components, electromechanical converter, driving amplifier, brush, inductance loop and electronic controller; The switch changeable torque valve-controlled oil distributing components comprises plunger and oil distributing valve group, and the oil distributing valve group is made up of front shroud, valve plate, back shroud, speed-sensitive switch high-pressure oil feed valve and speed-sensitive switch oil extraction Fill valve; Speed-sensitive switch high-pressure oil feed valve and speed-sensitive switch oil extraction Fill valve all are contained on the valve plate; The one side of described valve plate is close to described front shroud, and another side is close to described back shroud; Each speed-sensitive switch high-pressure oil feed valve and speed-sensitive switch oil extraction Fill valve all are connected with electromechanical converter, and each electromechanical converter all is connected with driving amplifier; Speed-sensitive switch high-pressure oil feed valve and speed-sensitive switch oil extraction Fill valve are formed by push rod, spool, spring chamber and spring, and an end of spool links to each other with push rod, and valve core upper sleeve has spring, and the other end of push rod passes back shroud and links to each other with electromechanical converter; Electromechanical converter is used to control the motion of push rod;
The entry end of speed-sensitive switch high-pressure oil feed valve links to each other with the pressure hydraulic fluid port, and outlet end links to each other with the plunger cavity of plunger; Spring chamber one end of described speed-sensitive switch oil extraction Fill valve links to each other with the plunger cavity of plunger, and the other end links to each other with return opening;
Electromechanical converter drives each speed-sensitive switch high-pressure oil feed valve and speed-sensitive switch oil extraction Fill valve in the oil distributing valve group by the motion of control push rod, and each valve is joined one, is that and then plunger case is rotating together.Its driving amplifier also is fitted together, and also and then plunger case turns round together.
Because the swashplate angle direction of this oil hydraulic motor is fixed, so oil suction district of plunger, the oil extraction district is all fixed with respect to the oil hydraulic motor housing, by driving amplifier and electromechanical converter the high-speed switch valve in the oil distributing valve group is carried out switch control, make the phase angle of control signal and the angle of swing of oil hydraulic motor projecting shaft fit like a glove, guarantee that each plunger of oil hydraulic motor can both be discharged to return opening to hydraulic oil by speed-sensitive switch oil extraction Fill valve in the backhaul process, in the process process, can both pass through speed-sensitive switch high-pressure oil feed valve or speed-sensitive switch oil extraction Fill valve from pressure hydraulic fluid port or return opening oil suction.Like this, along with the rotation of plunger case, each high-speed switch valve can both open and close with identical waveform and amplitude, and phase phase difference each other (360 °/plunger number), thereby has substituted the rotating function of the relative hydraulic motor cylinders of oil distribution casing.
Brush divides two bodies, and the brush drive part is installed on the housing of oil hydraulic motor, and the brush receiving part then is installed on the oil distributing valve group of oil hydraulic motor.The brush receiving part is a complete conductive hoop, links the feeder ear of all driving amplifiers, is these driving amplifier power supplies.The brush drive part is then linked on the external power supply of oil hydraulic motor.By being rotatably connected of brush, no matter how plunger case turns round, and each driving amplifier total energy obtains continuous, stable power supply.
Inductance loop also divides two bodies, and the inductance loop drive part is installed on the housing of oil hydraulic motor, and the inductance loop receiving part then is installed on the oil distributing valve group of oil hydraulic motor.Receiving part be 2N to plain conductor, receive the signal input part of the driving amplifier of this 2N high-speed switch valve respectively, be used for controlling the switch by force of this 2N high-speed switch valve.N is the plunger quantity of this oil hydraulic motor.The inductance loop drive part is not a single induction-driving component, but is made up of up to a hundred the induction-driving component that are distributed on the ring.The quantity of the sense cell corresponding with speed-sensitive switch high-pressure oil feed valve equals 2 times of required speed-sensitive switch signal dutyfactor resolution inverse, and each sense cell is all controlled separately by the electronic controller that directly links to each other with it.Only under the situation of induction-driving component useful effect, the inductance loop receiving part plain conductor of its corresponding position could picked up signal, allows corresponding speed-sensitive switch valve events.
Electronic controller is then according to the mounting point of each sense cell of inductance loop drive part on motor casing and the angle of swash plate, provide the switching signal of each valve of control, fit like a glove to the phase angle of each valve control signal and the suction oil condition of each plunger of oil hydraulic motor guaranteeing.Simultaneously according to requirement to the output loading size, dutycycle switching time to each speed-sensitive switch high-pressure oil feed valve is carried out real-time regulated, make oil suction stage at corresponding plunger, have only portion of time pressure oil can enter the plunger cavity of oil hydraulic motor by speed-sensitive switch high-pressure oil feed valve, the acting of promotion plunger, all the other time plunger cavities in oil suction stage are the speed-sensitive switch oil extraction Fill valve by communicating with return opening all, directly from the return opening oil suction, replenish the cavity that plunger motion produces, but can not promote the plunger acting, thereby make oil hydraulic motor average output torque not only with the discharge capacity of this oil hydraulic motor, the inlet oil pressure is directly proportional, also with the dutycycle of displacement in whole plunger oil suction stroke of speed-sensitive switch high-pressure oil feed valve opening time section inner plunger, thereby the average torque that output is directly proportional with dutycycle has realized that switch becomes moment of torsion control.It had not both changed the discharge capacity of oil hydraulic motor, did not change charge oil pressure yet, but it has finally directly changed the output torque of oil hydraulic motor.Pass between dutycycle and the average torque is:
Dutycycle=X
Open* 2n=T/ (D * P * η
Machine* η
Valve),
Wherein: X
OpenBe the plunger displacement in the speed-sensitive switch high-pressure oil feed valve opening time section, n is the rotating speed of hydraulic motor output shaft, the average torque of T for needing to obtain, and D is the discharge capacity of oil hydraulic motor, P is the pressure of pressure hydraulic fluid port, η
MachineBe the mechanical efficiency of oil hydraulic motor, η
ValveEfficient for oil distributing valve group control plunger cavity.
Below in conjunction with accompanying drawing 3, when plunger was in state 1, speed-sensitive switch high-pressure oil feed valve cut out under spring force and action of hydraulic force, and speed-sensitive switch oil extraction Fill valve is opened by force, and plunger is to the smooth oil extraction of return opening; When plunger was in state 2, speed-sensitive switch oil extraction Fill valve was closed by force, and plunger cavity pressure rises; When plunger was in state 3, speed-sensitive switch high-pressure oil feed valve was opened by force, and speed-sensitive switch oil extraction Fill valve still is in closed condition, the plunger cavity oil suction of boosting; When plunger was in state 4, speed-sensitive switch high-pressure oil feed valve cut out, and speed-sensitive switch oil extraction Fill valve still is in closed condition, and pressure promotes plunger and continues motion; When plunger was in state 5, plunger cavity pressure reduced, and speed-sensitive switch oil extraction Fill valve is opened under the effect of return opening pressure, and plunger is from the return opening oil suction; When plunger was in state 6, speed-sensitive switch oil extraction Fill valve was opened by force, guaranteed that plunger is from the smooth oil suction of return opening.
Substituted oil distribution casing oil hydraulic motor afterwards by this oil distributing valve group, when load torque is less, though its part plunger is in the oil suction district, but still from the return opening oil suction, and do not need pressure oil is wasted on the extra throttling control valve mouth, thereby saved a large amount of energy consumptions.
Meanwhile, because the face leakage of slide relative face is the biggest obstacle that fluid motor-driven pressure further raises between oil distribution casing and the plunger cylinder always, oil distributing valve group of the present invention is directly installed on the oil hydraulic motor plunger cylinder end face, replace oil distribution casing, do not had slide relative between oil distributing valve group and the oil hydraulic motor plunger cylinder end face, cleared away the major technique obstacle yet for the plunger hydraulic motor driving pressure significantly improves.
At last, it should be noted that above what enumerate only is specific embodiments of the invention.Obviously, the invention is not restricted to above embodiment, a lot of distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive from content disclosed by the invention or associate all should be thought protection scope of the present invention.
Claims (5)
1, a kind of electrohydraulic valve variable torque is joined the quantitative plunger piston hydraulic motor of oil type rotating cylinder cartridge type, comprise motor casing and swash plate, it is characterized in that, also comprise switch changeable torque valve-controlled oil distributing components, electromechanical converter, driving amplifier, brush, inductance loop and electronic controller; Described switch changeable torque valve-controlled oil distributing components comprises plunger and oil distributing valve group, and described oil distributing valve group is made up of front shroud, valve plate, back shroud, speed-sensitive switch high-pressure oil feed valve and speed-sensitive switch oil extraction Fill valve; Described speed-sensitive switch high-pressure oil feed valve and speed-sensitive switch oil extraction Fill valve all are contained on the valve plate; The one side of described valve plate is close to described front shroud, and another side is close to described back shroud; Each speed-sensitive switch high-pressure oil feed valve and speed-sensitive switch oil extraction Fill valve all are connected with electromechanical converter, and each electromechanical converter all is connected with driving amplifier; Described speed-sensitive switch high-pressure oil feed valve and speed-sensitive switch oil extraction Fill valve are formed by push rod, spool, spring chamber and spring, and an end of described spool links to each other with push rod, and valve core upper sleeve has spring, and the other end of push rod is connected with electromechanical converter; Described electromechanical converter is used to control the motion of push rod;
The entry end of described speed-sensitive switch high-pressure oil feed valve links to each other with the pressure hydraulic fluid port, and outlet end links to each other with the plunger cavity of plunger; Spring chamber one end of described speed-sensitive switch oil extraction Fill valve links to each other with the plunger cavity of plunger, and the other end links to each other with return opening;
Described brush is made up of brush drive part and coupled brush receiving part, and the brush drive part is installed on the motor casing, is used to connect the external power supply of oil hydraulic motor; The brush receiving part is installed on the oil distributing valve group and with all driving amplifiers and links to each other, and is used to the driving amplifier power supply.
Described inductance loop is made up of inductance loop drive part and coupled inductance loop receiving part, and the inductance loop drive part is installed on the motor casing, is used to detect the angular signal of oil hydraulic motor; The inductance loop receiving part is installed on the oil distributing valve group and with driving amplifier and links to each other, and is used to transmit the signal that is transmitted by drive part and gives driving amplifier;
Described electronic controller is installed on the motor casing and with each inductance loop and links to each other, and provide the control signal of each threshold switch according to the angular signal that the inductance loop drive part obtains, fit like a glove to the phase angle of each valve control signal and the suction oil condition of each plunger of oil hydraulic motor guaranteeing.
2, electrohydraulic valve variable torque according to claim 1 is joined the quantitative plunger piston hydraulic motor of oil type rotating cylinder cartridge type, it is characterized in that, an end of described push rod passes back shroud and links to each other with motor converter.
3, electrohydraulic valve variable torque according to claim 1 is joined the quantitative plunger piston hydraulic motor of oil type rotating cylinder cartridge type, it is characterized in that, the receiving part of described inductance loop be 2N to plain conductor, every pair of corresponding connection with each driving amplifier of plain conductor is used for controlling the switch of each valve; Wherein N is a plunger quantity.
4, electrohydraulic valve variable torque according to claim 1 is joined the quantitative plunger piston hydraulic motor of oil type rotating cylinder cartridge type, it is characterized in that the drive part of described inductance loop is made up of the sense cell that is evenly distributed on the ring; The quantity of sense cell is 2 times of required speed-sensitive switch signal dutyfactor resolution inverse, and each sense cell all links to each other with electronic controller.
5, a kind of electrohydraulic valve variable torque that is applicable to is joined the change torque control method of the quantitative plunger piston hydraulic motor of oil type rotating cylinder cartridge type, it is characterized in that, may further comprise the steps:
(1) inductance loop detects and obtains the hydraulic motor output shaft angle of swing, electronic controller is according to this angle of swing, by driving amplifier and electromechanical converter the high-speed switch valve in the oil distributing valve group is carried out switch control, make the phase angle of control signal and the angle of swing of oil hydraulic motor projecting shaft fit like a glove, guarantee that each plunger of oil hydraulic motor can both be discharged to return opening to hydraulic oil by speed-sensitive switch oil extraction Fill valve in the backhaul process, in the process process, can both pass through speed-sensitive switch high-pressure oil feed valve or speed-sensitive switch oil extraction Fill valve from pressure hydraulic fluid port or return opening oil suction;
(2) opening time of control speed-sensitive switch high-pressure oil feed valve, make corresponding plunger, have only part-time pressure oil can enter the plunger cavity of oil hydraulic motor, promote the plunger acting by speed-sensitive switch high-pressure oil feed valve in the oil suction stage;
All the other time plunger cavities in oil suction stage are the speed-sensitive switch oil extraction ≠ Fill valve by communicating with return opening all, directly from the return opening oil suction, replenish the cavity that plunger motion produces, but can not promote the plunger acting, guarantee that the average output torque of oil hydraulic motor is directly proportional with the dutycycle of displacement in whole plunger oil suction stroke of speed-sensitive switch high-pressure oil feed valve opening time section inner plunger;
(3) by real-time regulated to displacement dutycycle in whole plunger oil suction stroke of speed-sensitive switch high-pressure oil feed valve opening time section inner plunger, the average torque that is directly proportional with dutycycle of output has realized that electrohydraulic valve variable torque joins the change moment of torsion of the quantitative plunger piston hydraulic motor of oil type rotating cylinder cartridge type and control; Pass between dutycycle and the average torque is:
Dutycycle=X
Open* 2n=T/ (D * P * η
Machine* η
Valve),
Wherein: X
OpenBe the plunger displacement in the speed-sensitive switch high-pressure oil feed valve opening time section, n is the rotating speed of hydraulic motor output shaft, the average torque of T for needing to obtain, and D is the discharge capacity of oil hydraulic motor, P is the pressure of pressure hydraulic fluid port, η
MachineBe the mechanical efficiency of oil hydraulic motor, η
ValveEfficient for oil distributing valve group control plunger cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100693151A CN100538066C (en) | 2007-06-15 | 2007-06-15 | Electrohydraulic valve variable torque is joined the quantitative plunger piston hydraulic motor of oil type rotating cylinder cartridge type |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100693151A CN100538066C (en) | 2007-06-15 | 2007-06-15 | Electrohydraulic valve variable torque is joined the quantitative plunger piston hydraulic motor of oil type rotating cylinder cartridge type |
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| CN101074658A CN101074658A (en) | 2007-11-21 |
| CN100538066C true CN100538066C (en) | 2009-09-09 |
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Granted publication date: 20090909 Termination date: 20130615 |