A Hydraulic Back-to-Centre Locking Actuating Cylinder Structure

Abstract

The invention relates to a hydraulic centering locking actuating cylinder structure. The hydraulic centering locking actuating cylinder structure comprises an actuating cylinder shell, a cylinder cover and a piston rod; and the piston of the piston rod divides the inner cavity of the actuating cylinder shell into a front cavity and a rear cavity. The hydraulic centering locking actuating cylinderstructure further comprises a centering hydraulic oil flow channel and a centering actuating rod, wherein the centering hydraulic oil flow channel is formed in the side wall of the actuating cylindershell; the inner end of the centering actuating rod is inserted into the centering hydraulic oil flow channel; the outer end of the centering actuating rod is fixedly connected with the outer end of the piston rod through a connecting support, and synchronously acts with the piston rod; the centering actuating rod is of a hollow tubular structure which is blocked at a blocking position; at the blocking position, the centering actuating rod divides the centering hydraulic oil flow channel into a front cavity sub centering hydraulic oil flow channel and a rear cavity sub centering hydraulic oilflow channel through an internal blocking section and an external centering sealing ring, wherein the front cavity sub centering hydraulic oil flow channel and the rear cavity sub centering hydraulicoil flow channel are communicated with an external oil tank; and the blocking section is synchronous with the piston in position. Compared with the prior art, the hydraulic centering locking actuatingcylinder structure has the advantages of centering balance, convenience in control, simple structure, abrasion prevention and the like.

Description

technical field [0001] The invention relates to the field of engine hydraulic cylinders, in particular to a hydraulic centering and locking actuator structure. Background technique [0002] The traditional hydraulic actuator for launching the nozzle has no emergency return function, which does not meet the safety requirements of the thrust vectoring nozzle control. Therefore, it is necessary to design an actuator structure with an emergency return-to-center locking function, so that the piston of the vector nozzle actuator can stop at a certain intermediate position when the ESC fails, so as to ensure that multiple The nozzle controlled by the type actuator can return to the safe neutral position, thereby ensuring the safe and reliable operation of the engine. [0003] The literature "Research on Mechanism and Application of Wall Hole Back-to-center Hydraulic Actuator" (Zhu Kangwu. Chinese Journal of Mechanical Engineering, 2018, 54(10): 225-232) proposed a wall-hole back-t...

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Problems solved by technology

[0003] The literature "Research on Mechanism and Application of Wall Hole Back-to-center Hydraulic Actuator" (Zhu Kangwu. Chinese Journal of Mechanical Engineering, 2018, 54(10): 225-232) proposed a wall-hole back-to-center hydraulic actuator. Under fault conditions, the two-chamber At the same time, high-pressure oil is supplied to push the piston to the center hole in the middle of the actuator housing, and the oil flows back to the oil tank through the center hole. The structural defect is that the piston will scratch when it passes through the wall hole, and long-term work will cause The wear of the sealing ring increases the internal leakage and affects the performance of the actuator

[0004] The Chinese patent "A Hydraulic Actuator for Emergency Centering" (publication number CN101451556A) has designed a centering structure including active pistons, emergency pistons and support rods. The structure is relatively complicated and the actuator works in a limited space. Small range of travel

[0005] The US patent "Fall-safe Electric Hydraulic Actuator" (patent number US 005950427A) resets the actuator to the center position through the spring installed in the two chambers of the actuator. Its structure is relatively complicated, and it also needs to be equipped with a spare controller , the system is complex and redundant, and the aerospace field with strict requirements on space and weight restrictions cannot be well applied

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