CN104728197A - Load-sensitive electro-hydrostatic actuator - Google Patents
Load-sensitive electro-hydrostatic actuator Download PDFInfo
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- CN104728197A CN104728197A CN201510120019.4A CN201510120019A CN104728197A CN 104728197 A CN104728197 A CN 104728197A CN 201510120019 A CN201510120019 A CN 201510120019A CN 104728197 A CN104728197 A CN 104728197A
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- load
- hydraulic pump
- actuator
- displacement hydraulic
- hydrostatic actuator
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
- F15B11/163—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for sharing the pump output equally amongst users or groups of users, e.g. using anti-saturation, pressure compensation
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
- F15B11/165—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for adjusting the pump output or bypass in response to demand
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/16—Special measures for feedback, e.g. by a follow-up device
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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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
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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
- F15B21/08—Servomotor systems incorporating electrically operated control means
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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
- 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
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/61—Secondary circuits
- F15B2211/613—Feeding circuits
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/65—Methods of control of the load sensing pressure
- F15B2211/651—Methods of control of the load sensing pressure characterised by the way the load pressure is communicated to the load sensing circuit
Abstract
The invention relates to a load-sensitive electro-hydrostatic actuator. The load-sensitive electro-hydrostatic actuator comprises a variable displacement hydraulic pump, a first series switch set, a dissymmetrical hydraulic cylinder and an executing mechanism; the variable displacement hydraulic pump comprises an oil inlet and an oil outlet; the first series switch set comprises a first switch valve and a second switch valve which are connected in series, the first end of the first switch valve is connected with the oil outlet, and the first end of the second switch valve is connected with the oil inlet; the dissymmetrical hydraulic cylinder comprises a shell and a first dissymmetrical piston, the shell is separated into a first rod cavity and a first non-rod cavity by the first dissymmetrical piston, the first rod cavity is connected to the second end of the first switch valve and the second end of the second switch valve, and the first non-rod cavity is connected to the oil inlet; the input end of the executing mechanism is connected with the first rod cavity and used for generating signals of changing the output displacement of the variable displacement hydraulic pump based on the hydraulic pressure of the first rod cavity. By adopting load-sensitive electro-hydrostatic actuator, heating of a system can be reduced, and therefore the energy loss can be reduced.
Description
Technical field
The present invention relates to a kind of Electrical hydrostatic actuator field, particularly a kind of Electrical hydrostatic actuator of load-sensitive.
Background technique
EHA (Electrical hydrostatic actuator, Electro-Hydrostatic Actuator) is the integrated local hydraulic actuator of a kind of height, is the actuator of power-by-wire actuating system in how electric aircraft.EHA has compared with traditional hydraulic actuation system that volume is little, lightweight, efficiency advantages of higher, is the focus of current research.By adopting the mode of load-sensitive, can energy loss be reduced, reducing the heating of motor.
At present, what the power-by-wire actuating system Application comparison of aircraft was many in the world is fixed displacement variable speed type Electrical hydrostatic actuator, and its advantage is that structure is simple, lighter in weight.But, due to the Integration Design of height, cause system radiating more difficult; Under heavy load, electric efficiency is lower, and electric current is comparatively large, and heating is serious, causes EHA to work long hours.
Current solution, one be system at the beginning of, consider the heat dissipation problem of system; Two is utilize variable-displacement pump, changes the velocity ratio of system, thus improve the power match situation of motor by changing pump delivery, reduces the heating value of system.And the stroking mechanism that the variable actuator of variable displacement pump adopts servo valve control oil hydraulic cylinder to carry out driven pump mostly realizes becoming discharge capacity, or the stroking mechanism of electromechanical actuator (EMA) driven pump is adopted to realize becoming discharge capacity; These two kinds of mode complicated structures, add system failure rate.
Because the power loss of load sensitive control system is lower, efficiency is far above conventional hydraulic system; High efficiency, power loss be little means the saving of fuel and the lower heating value of hydraulic system; Thus load-sensitive mode is introduced in EHA by Ye You research institution.But existing load-sensitive type EHA mostly adopts servovalve to carry out commutating and controls, and servovalve will produce amount of heat in the process of work, be unfavorable for the heating of reduction system.
Summary of the invention
Provide hereinafter about brief overview of the present invention, to provide about the basic comprehension in some of the present invention.Should be appreciated that this general introduction is not summarize about exhaustive of the present invention.It is not that intention determines key of the present invention or pith, and nor is it intended to limit the scope of the present invention.Its object is only provide some concept in simplified form, in this, as the preorder in greater detail discussed after a while.
A main purpose of the present invention is the Electrical hydrostatic actuator providing a kind of new load-sensitive, and it can reduce heating, the minimizing energy loss of whole system, and then improves the working efficiency of whole system.
According to an aspect of the present invention, a kind of Electrical hydrostatic actuator of load-sensitive, comprises and becomes displacement hydraulic pump, the first tandem tap group and asymmetrical cylinder and actuator;
Described change displacement hydraulic pump comprises filler opening and oil outlet;
First tandem tap group comprises the first switch valve and the second switch valve of series connection, and the first end of described first switch valve is connected with described oil outlet, and the first end of described second switch valve is connected with described filler opening;
Described asymmetrical cylinder comprises housing and the first asymmetry piston, described housing is divided into the first rod chamber and the first rodless cavity by described first asymmetry piston, described first rod chamber is connected to the second end of described first switch valve and the second end of described second switch valve, and described first rodless cavity is connected to described filler opening;
The input end of described actuator is connected with described first rod chamber, changes for generating based on the hydraulic pressure of described first rod chamber the signal that described change displacement hydraulic pump exports discharge capacity.
Adopt the Electrical hydrostatic actuator of load-sensitive of the present invention, the heating of system can be reduced, reduce energy loss.
Accompanying drawing explanation
Below with reference to the accompanying drawings illustrate embodiments of the invention, above and other objects, features and advantages of the present invention can be understood more easily.Parts in accompanying drawing are just in order to illustrate principle of the present invention.In the accompanying drawings, same or similar technical characteristics or parts will adopt same or similar reference character to represent.
Fig. 1 is the structural drawing of a kind of mode of execution of the Electrical hydrostatic actuator of load-sensitive of the present invention;
Fig. 2 is the Electrical hydrostatic actuator of the load-sensitive of Fig. 1 flow direction schematic diagram when being operated in first quartile and the second quadrant;
Fig. 3 is the Electrical hydrostatic actuator of the load-sensitive of Fig. 1 flow direction schematic diagram when being operated in third quadrant and fourth quadrant.
Embodiment
With reference to the accompanying drawings embodiments of the invention are described.The element described in an accompanying drawing of the present invention or a kind of mode of execution and feature can combine with the element shown in one or more other accompanying drawing or mode of execution and feature.It should be noted that for purposes of clarity, accompanying drawing and eliminate expression and the description of unrelated to the invention, parts known to persons of ordinary skill in the art and process in illustrating.
Shown in Figure 1, be the structural drawing of a kind of mode of execution of the Electrical hydrostatic actuator of load-sensitive of the present invention.
In the present embodiment, the Electrical hydrostatic actuator of load-sensitive comprises and becomes displacement hydraulic pump 2, first tandem tap group and asymmetrical cylinder 9 and actuator 4.
Wherein, become displacement hydraulic pump 2 and comprise filler opening and oil outlet.When specifically using, the filler opening and the oil outlet that become displacement hydraulic pump 2 all can carry out oil suction and oil extraction according to the actual requirements.
First tandem tap group comprises the first switch valve 7 and the second switch valve 8 of series connection.The first end of the first switch valve 7 is connected with oil outlet, and the first end of second switch valve 8 is connected with filler opening.
Asymmetrical cylinder 9 comprises housing and the first asymmetry piston.Housing is divided into the first rod chamber and the first rodless cavity by the first asymmetry piston, and the first rod chamber is connected to the second end of the first switch valve 7 and the second end of second switch valve 8, and the first rodless cavity is connected to filler opening.The post portion external load of the first asymmetry piston, for being with dynamic load to perform relevant action, or, move up and down under the drive of load.
The input end of actuator 4 is connected with the first rod chamber, becomes for generating to change based on the hydraulic pressure of the first rod chamber the signal that displacement hydraulic pump 2 exports discharge capacity.
The Electrical hydrostatic actuator of the load-sensitive of present embodiment, also comprises the second tandem tap group and fuel tank 3.
Between the filler opening that second tandem tap group is connected to change displacement hydraulic pump 2 and oil outlet, and be connected with fuel tank 3, for the oil in fuel tank 3 being inputted asymmetrical cylinder 9 or the oil in asymmetrical cylinder 9 being expelled in fuel tank.
In one embodiment, the second tandem tap group can comprise the first Pilot operated check valve 5 and the second Pilot operated check valve 6 of series connection.
First Pilot operated check valve 5 comprises the first hydraulic control end, first input end and the first output terminal.First hydraulic control end is connected with filler opening, and first input end is connected with oil outlet, and the first output terminal is connected with fuel tank.Because the first hydraulic control end is connected with filler opening, when filler opening is high pressure, the first Pilot operated check valve 5 is opened.
Second Pilot operated check valve 6 comprises the second hydraulic control end, the second input end and the second output terminal.Second hydraulic control end is connected with oil outlet, and the second input end is connected with filler opening, and the second output terminal is connected with fuel tank.Because the second hydraulic control end is connected with oil outlet, when oil outlet is high pressure, the second Pilot operated check valve 6 is opened.
First asymmetry piston can comprise the first piston part and be connected in the first side, piston part and the first post portion vertical with the first piston part.
As a kind of preferred version, the cross-section area of the first piston part is two times that the first post cross section amasss.
As a kind of preferred version, the Electrical hydrostatic actuator of load-sensitive of the present invention can also comprise the damping hole 10 be connected between the first rod chamber and actuator 4 input end.Damping hole 10 can reduce the instantaneous flow being input to actuator 4 input end, makes the flow being input to actuator 4 more steady.
In one embodiment, actuator 4 can be single-action hydraulic cylinder.
Single-action hydraulic cylinder 4 can comprise cylinder body, the second asymmetry piston and be positioned at the spring of cylinder body.Second asymmetry piston comprises orthogonal second post portion and the second piston part.Second piston part coordinates formation one to comprise the second cavity of the entrance being connected to the first rod chamber with the inwall of cylinder body.
What spring was arranged at single-action hydraulic cylinder comprises in the 3rd cavity in the second post portion, the elastic force direction of spring and the dead in line in the second post portion, and spring works is in unstretched condition.
One end and second piston part in the second post portion are connected, the other end in the second post portion is connected to change displacement hydraulic pump, for according to entering liquid in the second cavity to the pressure of the second piston part and spring making a concerted effort to change and become displacement hydraulic pump and export discharge capacity the pressure of the second piston part.
In the present embodiment, become displacement hydraulic pump 2 and comprise swash plate, become the output flow of displacement hydraulic pump 2 and the angle of inclination positive correlation of swash plate.In other words, swash plate angle of inclination is larger, and the output flow becoming displacement hydraulic pump 2 is larger.
Second post portion of single-action hydraulic cylinder 4 is connected with the swash plate becoming displacement hydraulic pump, changes the output flow becoming displacement hydraulic pump 2 for the angle of inclination by changing swash plate.
Because single-action hydraulic cylinder 4 is connected with the first rod chamber of asymmetrical cylinder 9, it can the responsive hydraulic pressure when the first rod chamber, and promote the second asymmetry piston of single-action hydraulic cylinder 4 left, and then change the angle of inclination of the swash plate becoming displacement hydraulic pump 2.
In addition, the Electrical hydrostatic actuator of load-sensitive also comprises speed-adjustable motor 1.Speed-adjustable motor 1 is connected with change displacement hydraulic pump 2, becomes displacement hydraulic pump 2 for driving.
Such as, when single-action hydraulic cylinder 4 promotes the swash plate becoming displacement hydraulic pump 2, its angle of inclination is reduced, ensures that if think the power exporting the load be connected with asymmetrical cylinder 9 to remains unchanged simultaneously, the rotating speed of speed-adjustable motor 1 can be increased.Rotating speed by increasing motor 1 ensures that the power exporting load place to remains unchanged.So, the Driving Torque of motor reduces, and therefore its electric current reduces, and then reduces copper loss and the heating value of motor.
Shown in Figure 2, the Electrical hydrostatic actuator for the load-sensitive of Fig. 1 is operated in flow direction schematic diagram when first quartile and the second quadrant.The Electrical hydrostatic actuator that filled arrows in Fig. 2 represents load-sensitive is operated in liquid flow direction during first quartile; The Electrical hydrostatic actuator that hollow arrow in Fig. 2 represents load-sensitive is operated in liquid flow direction during the second quadrant.
Shown in Figure 3, the Electrical hydrostatic actuator for the load-sensitive of Fig. 1 is operated in flow direction schematic diagram when third quadrant and fourth quadrant.The Electrical hydrostatic actuator that filled arrows in Fig. 3 represents load-sensitive is operated in liquid flow direction during third quadrant; The Electrical hydrostatic actuator that hollow arrow in Fig. 3 represents load-sensitive is operated in liquid flow direction during fourth quadrant.
When the Electrical hydrostatic actuator of load-sensitive of the present invention is operated in first quartile, speed-adjustable motor 1 drives change displacement hydraulic pump 2 to rotate, high pressure oil is exported by the upper end (i.e. oil outlet) becoming displacement hydraulic pump 2, first switch valve 7 works in on-state, second switch valve 8 works in cut-off state, first asymmetry piston ouput force of asymmetrical cylinder 9 and movement velocity all downward, second Pilot operated check valve 6 is because the high pressure of upper end oil circuit is in open mode, a fluid part for first rodless cavity enters the filler opening becoming displacement hydraulic pump 2, and a part gets back to fuel tank 3.
When the Electrical hydrostatic actuator of load-sensitive of the present invention is operated in the second quadrant, asymmetrical cylinder 9 acts on by along carrying, and the ouput force of the first asymmetry piston is downward, and movement velocity upwards, becomes displacement hydraulic pump 2 and work in motor operating conditions.Speed-adjustable motor 1 works in generator operating mode, and the first switch valve 7 works in on-state, and second switch valve 8 works in cut-off state.Second Pilot operated check valve 6 is in open mode, and the fluid part entering the first rodless cavity flows into by becoming displacement hydraulic pump 2, and a part is by fuel tank 3 repairing.
When the Electrical hydrostatic actuator of load-sensitive of the present invention is operated in third quadrant, namely speed-adjustable motor 1 drives variable displacement pump to rotate backward, high pressure oil is exported by the lower end (i.e. filler opening) of pump, first switch valve 7 works in cut-off state, second switch valve 8 works in on-state, all upwards, the first Pilot operated check valve 5 is because the high pressure of lower end oil circuit is in open mode for the ouput force of the first asymmetry piston of asymmetrical cylinder 9 and movement velocity.The fluid of the first rod chamber enters the first rodless cavity by oil circuit, and remaining fluid is drawn by becoming displacement hydraulic pump 2 and is input to the first rodless cavity from fuel tank 3.
When the Electrical hydrostatic actuator of load-sensitive of the present invention is operated in fourth quadrant, asymmetrical cylinder 9 acts on by along carrying, first asymmetry piston ouput force upwards, and movement velocity is downward, become displacement hydraulic pump pump 2 and work in motor operating conditions, speed-adjustable motor 1 works in generator operating mode, first switch valve 7 works in cut-off state, and second switch valve 8 works in on-state, first Pilot operated check valve 5 is in open mode, a part of fluid of the first rodless cavity flows into the first rod chamber, and unnecessary fluid gets back to fuel tank 3 by becoming displacement hydraulic pump 2.
Because the first rod chamber of asymmetrical cylinder and effective work area of the first rodless cavity are 1:2, and asymmetrical cylinder 9 actuator adopts Differential Driving when being operated in three four-quadrants, in other words, high pressure oil is communicated with the first rod chamber and first rodless cavity of asymmetrical cylinder 9 simultaneously, because the first rod chamber and the first rodless cavity exist difference in areas, at the same pressure, the active force of the first rodless cavity is greater than the first rod chamber, promote the piston rod movement of asymmetrical cylinder 9, therefore when the delivery pressure becoming displacement hydraulic pump 2 is constant, actuator is equal in one or three quadrant ouput forces, direction is contrary.The control asymmetry of such asymmetrical cylinder 9 is overcome, and obtains the control identical with symmetrical hydraulic cylinder and output characteristics.
In addition, choosing of speed-adjustable motor 1 power is no longer determined by the peak rate of flow of the first rodless cavity of asymmetrical cylinder.Namely power of motor reduces half than before, alleviates the weight of system, improves capacity usage ratio.Specifically, because the first rod chamber of asymmetrical cylinder 9 and the first rodless cavity exist difference in areas, when high pressure oil acts on the first rod chamber and the first rodless cavity respectively time, under same traffic, when high pressure oil acts on the first rod chamber time, ratio acted on the first rodless cavity, the movement velocity of the first asymmetry piston wants large.When being applied to the first rodless cavity to allow high pressure oil, the movement velocity of the first asymmetry piston arrives the maximum movement speed of this Electrical hydrostatic actuator, then need the peak rate of flow according to the maximum movement speed computing system of the first rodless cavity thus choose the power of speed-adjustable motor.According to the feature of this system, the area ratio of the first rod chamber and the first rodless cavity is 1:2, if do not adopt Differential Driving, then the power of speed-adjustable motor, rotating speed and rated current will be the twices adopting Differential Driving.In addition, after adopting Differential Driving, the weight of speed-adjustable motor and the volume of motor also have obvious minimizing.
In the four-quadrant operation of the Electrical hydrostatic actuator of load-sensitive of the present invention, according to the performance characteristic of oil circuit, first rod chamber is in high pressure operating mode always, again because effective work area of the first rod chamber and the first rodless cavity is 1:2, the pressure of the first rod chamber directly reacts the ouput force of actuator, therefore using the pressure of this first rod chamber directly as the input end of single-action hydraulic cylinder 4.When induced pressure raises, the pressure of the first rod chamber increases, then the second asymmetry piston of single-action hydraulic cylinder 4 is moved to the left, and the swashplate angle becoming displacement hydraulic pump 2 diminishes, and discharge capacity reduces.Meanwhile, in order to keep flow needed for load, can increase by improving speed-adjustable motor 1 rotating speed the output flow becoming displacement hydraulic pump 2, thus increasing the flow exporting load to.So, the heating of speed-adjustable motor 1 can be reduced, improve its working efficiency.
The Electrical hydrostatic actuator of load-sensitive of the present invention, can realize the control of the ouput force to actuator, displacement or speed.Specifically, the parameters such as the exportable power of Electrical hydrostatic actuator of the present invention, displacement and speed, this Electrical hydrostatic actuator can realize controlling respectively the power exported, displacement and speed respectively.In other words, when the output of Electrical hydrostatic actuator is power, it accurately can control size and the outbound course of ouput force; Also similar control can be realized for displacement and speed.
Adopt the Electrical hydrostatic actuator of load-sensitive of the present invention, the heating of system can be reduced, thus reduce energy loss.
Above some embodiments of the present invention are described in detail.As one of ordinary skill in the art can be understood, whole or any step of method and apparatus of the present invention or parts, can in the network of any calculating equipment (comprising processor, storage medium etc.) or calculating equipment, realized with hardware, firmware, software or their combination, this is that those of ordinary skill in the art use their basic programming skill just can realize when understanding content of the present invention, therefore need not illustrate at this.
In addition, it is evident that, when relating to possible peripheral operation in superincumbent explanation, any display device and any input device, corresponding interface and control program that are connected to any calculating equipment will be used undoubtedly.Generally speaking, related hardware in computer, computer system or computer network, software and realize the hardware of the various operations in preceding method of the present invention, firmware, software or their combination, namely form equipment of the present invention and each constituent elements thereof.
Therefore, based on above-mentioned understanding, object of the present invention can also be realized by an operation program or batch processing on any messaging device.Described messaging device can be known standard equipment.Therefore, object of the present invention also can realize only by the program product of providing package containing the program-code realizing described method or equipment.That is, such program product also forms the present invention, and stores or the medium that transmits such program product also forms the present invention.Obviously, described storage or transmission medium can be well known by persons skilled in the art, or the storage of any type developed in the future or transmission medium, therefore also there is no need to enumerate various storage or transmission medium at this.
In equipment of the present invention and method, obviously, each parts or each step reconfigure after can decomposing, combine and/or decomposing.These decompose and/or reconfigure and should be considered as equivalents of the present invention.Also it is pointed out that the step performing above-mentioned series of processes can order naturally following the instructions perform in chronological order, but do not need necessarily to perform according to time sequencing.Some step can walk abreast or perform independently of one another.Simultaneously, above in the description of the specific embodiment of the invention, the feature described for a kind of mode of execution and/or illustrate can use in one or more other mode of execution in same or similar mode, combined with the feature in other mode of execution, or substitute the feature in other mode of execution.
Should emphasize, term " comprises/comprises " existence referring to feature, key element, step or assembly when using herein, but does not get rid of the existence or additional of one or more further feature, key element, step or assembly.
Although described the present invention and advantage thereof in detail, be to be understood that and can have carried out various change when not exceeding the spirit and scope of the present invention limited by appended claim, substituting and conversion.And the scope of the application is not limited only to the specific embodiment of process, equipment, means, method and step described by specification.One of ordinary skilled in the art will readily appreciate that from disclosure of the present invention, can use perform the function substantially identical with corresponding embodiment described herein or obtain and its substantially identical result, existing and that will be developed in the future process, equipment, means, method or step according to the present invention.Therefore, appended claim is intended to comprise such process, equipment, means, method or step in their scope.
Claims (9)
1. an Electrical hydrostatic actuator for load-sensitive, is characterized in that, comprises and becomes displacement hydraulic pump, the first tandem tap group and asymmetrical cylinder and actuator;
Described change displacement hydraulic pump comprises filler opening and oil outlet;
First tandem tap group comprises the first switch valve and the second switch valve of series connection, and the first end of described first switch valve is connected with described oil outlet, and the first end of described second switch valve is connected with described filler opening;
Described asymmetrical cylinder comprises housing and the first asymmetry piston, described housing is divided into the first rod chamber and the first rodless cavity by described first asymmetry piston, described first rod chamber is connected to the second end of described first switch valve and the second end of described second switch valve, and described first rodless cavity is connected to described filler opening;
The input end of described actuator is connected with described first rod chamber, changes for generating based on the hydraulic pressure of described first rod chamber the signal that described change displacement hydraulic pump exports discharge capacity.
2. the Electrical hydrostatic actuator of load-sensitive according to claim 1, is characterized in that, also comprises the second tandem tap group and fuel tank;
Between the filler opening that described second tandem tap group is connected to described change displacement hydraulic pump and oil outlet, and be connected with described fuel tank, for the oil in described fuel tank being inputted described asymmetrical cylinder or the oil in described asymmetrical cylinder being expelled in described fuel tank.
3. the Electrical hydrostatic actuator of load-sensitive according to claim 2, is characterized in that:
Described second tandem tap group comprises the first Pilot operated check valve and second Pilot operated check valve of series connection;
Described first Pilot operated check valve comprises the first hydraulic control end, first input end and the first output terminal, and described first hydraulic control end is connected with described filler opening, and described first input end is connected with described oil outlet, and described first output terminal is connected with described fuel tank;
Described second Pilot operated check valve comprises the second hydraulic control end, the second input end and the second output terminal, and described second hydraulic control end is connected with described oil outlet, and described second input end is connected with described filler opening, and described second output terminal is connected with described fuel tank.
4. the Electrical hydrostatic actuator of the load-sensitive according to claim 1-3 any one, is characterized in that:
Described first asymmetry piston comprises the first piston part and is connected in described first side, piston part and the first post portion vertical with described first piston part;
The cross-section area of described first piston part is two times that described first post cross section amasss.
5. the Electrical hydrostatic actuator of load-sensitive according to claim 4, is characterized in that, also comprises:
Be connected to the damping hole between described first rod chamber and described actuator input end, for reducing the instantaneous flow being input to described actuator input end.
6. the Electrical hydrostatic actuator of load-sensitive according to claim 5, is characterized in that:
Described actuator is single-action hydraulic cylinder.
7. the Electrical hydrostatic actuator of load-sensitive according to claim 6, is characterized in that:
Described single-action hydraulic cylinder comprises cylinder body, the second asymmetry piston and is positioned at the spring of described cylinder body;
Described second asymmetry piston comprises orthogonal second post portion and the second piston part;
Described second piston part coordinates formation one to comprise with the inwall of described cylinder body to be connected to the second cavity of the entrance of described first rod chamber;
What described spring was arranged at described single-action hydraulic cylinder comprises in the 3rd cavity in the second post portion, the elastic force direction of described spring and the dead in line in described second post portion, and described spring works is in unstretched condition;
One end and described second piston part in described second post portion are connected, the other end in described second post portion is connected to described change displacement hydraulic pump, for according to enter liquid in described second cavity to the pressure of described second piston part and described spring to the pressure of described second piston part make a concerted effort change described change displacement hydraulic pump and export discharge capacity.
8. the Electrical hydrostatic actuator of load-sensitive according to claim 7, is characterized in that:
Described change displacement hydraulic pump comprises swash plate, the output flow of described change displacement hydraulic pump and the tilt angle positive correlation of described swash plate;
Second post portion of described single-action hydraulic cylinder is connected with the swash plate of described change displacement hydraulic pump, changes the output flow of described change displacement hydraulic pump for the angle of inclination by changing described swash plate.
9. the Electrical hydrostatic actuator of load-sensitive according to claim 8, is characterized in that:
Also comprise speed-adjustable motor;
Described speed-adjustable motor is connected with described change displacement hydraulic pump, for driving described change displacement hydraulic pump.
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| CN108412826A (en) * | 2018-04-26 | 2018-08-17 | 福建工程学院 | A kind of electric hydrostatic actuator and its control method of two parallel pumps driving |
| CN110778565A (en) * | 2019-10-31 | 2020-02-11 | 北京机械设备研究所 | Single-rod servo electric cylinder with embedded linear displacement sensor |
| CN111734699A (en) * | 2020-07-09 | 2020-10-02 | 四川航天烽火伺服控制技术有限公司 | Electric hydrostatic actuator |
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| CN104728197B (en) | 2017-03-15 |
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