Hydraulically Driven Direct Rotary Actuator with Limited Rotation Angle

Abstract

The invention discloses a hydraulic drive limited-rotating-angle straight rotating actuator. An oil port A penetrates through a piston rod (4) to be communicated with the left end of a hollow piston head (6), an oil port B penetrates through a fixing rod (7) to be communicated with the right end of the hollow piston head, the piston rod and the fixing rod are respectively connected at the two ends of a distributing rod (5) through the hollow piston head, the distributing rod connected with the piston rod at the two ends is assembled in a cavity of the hollow piston head assembled in an output barrel body (3), the piston rod movably assembled at the two ends of the distributing rod is connected with the hollow piston head through an external thread on a rod head, the screwing directions of internal threads at the two ends of the cavity of the hollow piston head are opposite, the internal threads are respectively screwed with the piston rod by a helix lead angle of more than 80 degrees to form a screw motion pair, the screwing directions of the two ends of the piston rod and helix lead angles of the two ends of the piston rod are the same, wherein one end of the hollow piston head and the piston rod form a screw motion pair, the other end of the hollow piston head and the fixing rod form a screw motion pair, the piston rod is fixed to the output barrel body, and the output barrel body outputs a torque. According to the hydraulic drive limited-rotating-angle straight rotating actuator, a transmission mechanism is simple, and the actuation time is short.

Description

technical field [0001] The invention is a rotary actuator which adopts a hydraulically driven helical pair to rotate a limited angle to realize the conversion of hydraulic energy into mechanical energy. Background technique [0002] Actuators are divided into electrohydraulic actuators, electromechanical actuators (EMA), electrohydrostatic actuators (EHA) and integrated actuator devices (IAP). Most of the swing mechanisms such as aircraft doors, rudder surfaces, and steering systems are driven by linear actuators or all-electric actuators. The linear actuator requires a special locking mechanism and linkage mechanism to realize the mechanism swing, which not only occupies a large amount of weight and installation space of the aircraft, but also affects the overall layout of the equipment; the all-electric mechanism actuator has a complex structure and limited output torque , is not suitable for driving large torque loads. At the same time, the reliability of all-electric me...

AI Technical Summary

Problems solved by technology

The linear actuator requires a special locking mechanism and linkage mechanism to realize the mechanism swing, which not only occupies a large amount of weight and installation space of the aircraft, but also affects the overall layout of the equipment; the all-electric mechanism actuator has a complex structure and limited output torque , not suitable for driving large torque loads. At the same time, the reliability of all-electric mechanism actuators is lower than that of mechanical actuators, which often needs to be compensated in the form of redundancy, which undoubtedly increases the weight and overall layout.

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