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Electro-hydrostatic actuator sensitive to load

An electro-hydrostatic, load-sensitive technology, used in fluid pressure actuation devices, fluid pressure actuation system components, servo motors, etc., can solve problems such as unfavorable system heating, and achieve the effect of reducing heat generation and energy loss.

Active Publication Date: 2015-07-01
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the existing load-sensitive EHAs use servo valves for commutation and control, and servo valves will generate a lot of heat during operation, which is not conducive to reducing the heat generation of the system

Method used

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  • Electro-hydrostatic actuator sensitive to load

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Embodiment Construction

[0022] Embodiments of the present invention will be described below with reference to the drawings. Elements and features described in one drawing or one embodiment of the present invention may be combined with elements and features shown in one or more other drawings or embodiments. It should be noted that representation and description of components and processes that are not related to the present invention and known to those of ordinary skill in the art are omitted from the drawings and descriptions for the purpose of clarity.

[0023] see figure 1 Shown is a structural diagram of an embodiment of the load-sensitive electrohydrostatic actuator of the present invention.

[0024] In this embodiment, the load-sensitive electrohydrostatic actuator includes a variable-displacement hydraulic pump 2 , a shuttle valve 7 , an asymmetric hydraulic cylinder 8 , a pressure-following servo valve 9 and an actuator 4 .

[0025] A variable displacement hydraulic pump includes an oil inl...

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Abstract

The invention relates to an electro-hydrostatic actuator sensitive to load. The actuator comprises a variable displacement hydraulic pump, a shuttle valve, an asymmetrical hydraulic cylinder, a pressure servo valve and an actuating mechanism. The variable displacement hydraulic pump comprises an oil inlet and an oil outlet; the shuttle valve comprises a first inlet, a second inlet and an outlet; the asymmetrical hydraulic cylinders comprises a shell and a first asymmetrical piston; the pressure servo valve is connected between a first rod cavity of the asymmetrical hydraulic cylinder and the input end of an actuating mechanism and used for adjusting the instantaneous flow input into the input end of the actuating mechanism; the input end of the actuating mechanism is connected with the output end of the pressure servo motor and used for generating a signal for changing the output displacement of the variable displacement hydraulic pump based on hydraulic pressure of the first rod cavity. By the adoption of the electro-hydrostatic actuator sensitive to load, the output hydraulic pressure of the pressure servo value can be controlled to adjust the output flow of the variable displacement hydraulic pump in a quantitative mode, and therefore heat dissipation and power consumption of a whole system are reduced.

Description

technical field [0001] The invention relates to the field of electric hydrostatic actuators, in particular to a load-sensitive electric hydrostatic actuator. Background technique [0002] EHA (Electro-Hydrostatic Actuator) is a highly integrated partial hydraulic actuator, which is the actuator of the power fly-by-wire actuation system in multi-electric aircraft. Compared with the traditional hydraulic actuating system, EHA has the advantages of small size, light weight, high efficiency, etc., and it is a hot spot of current research. By adopting the load sensitive method, energy loss can be reduced and the heating of the motor can be reduced. [0003] At present, the electric hydrostatic actuator with constant displacement and variable speed is widely used in the power fly-by-wire actuation system of aircraft in the world. Its advantages are simple structure and light weight. However, due to the highly integrated design, it is difficult to dissipate heat from the system; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B11/16F15B13/16F15B15/14F15B21/08F15B13/06
CPCF15B11/08F15B13/06F15B15/1423F15B21/08
Inventor 尚耀星郝伟一焦宗夏吴帅宋增宁
Owner BEIHANG UNIV
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