Hydraulic Rotary Actuator

摘要

A hydraulic rotary actuator including a stator housing having a through bore to position a rotor assembly. A rotor assembly includes an output shaft and at least a first rotary piston member disposed radially about the output shaft. The rotary piston member includes an vane element. A continuous seal is disposed on peripheral longitudinal faces and lateral end faces of the rotary piston element. The bore through the stator housing includes an interior cavity with surfaces adapted to receive the rotor assembly and contact the continuous seal. With rotation fluid ports blocked, the housing cavity is sealed with the continuous piston seal for hydraulic blocking, preventing actuator displacement by external forces. A method of operation and method of assembly is disclosed.

主权项

1. A hydraulic rotary actuator comprising:
a stator housing comprising a single seamless body having a bore disposed axially therethrough, the bore having a first end bore portion having a first diameter, a second end bore portion having a second diameter, and at least a middle bore portion disposed between the first end bore portion and the second end bore portion, said middle bore portion having a third diameter larger than the first diameter and a semi-cylindrical surface of the middle bore, and a first interior end surface between the middle bore portion and the first end bore portion, and a second interior end surface between said second bore portion and the middle bore portion, said middle bore further including a first arcuate ledge disposed inward radially along a portion of a perimeter of the middle bore, said arcuate ledge having a fourth diameter less that the third diameter of the middle bore and a semi-cylindrical surface; a rotor assembly including:
an output shaft, anda first rotary piston member disposed radially about the output shaft, said first rotary piston member including:
an vane,a portion adapted to connect to the output shaft when the first rotary piston member is disposed radially about the output shaft,a first peripheral longitudinal face of the rotary piston member,a second peripheral longitudinal face of the rotary piston member, said second peripheral longitudinal face positioned axially on the vane,a first peripheral lateral face,a second peripheral lateral face, anda continuous seal disposed on the first and second peripheral longitudinal faces and the first and second peripheral lateral faces of the rotary piston member; and wherein when the rotor assembly is assembled and rotated in the bore of the stator housing, a portion of the continuous seal positioned on the first peripheral longitudinal face contacts the semi-cylindrical surface of the middle bore portion, a portion of the continuous seal positioned on the second peripheral longitudinal face contacts the semi-cylindrical surface of the arcuate ledge, a portion of the continuous seal positioned on the first peripheral lateral face contacts the first interior end surface, and a portion of the continuous seal positioned on the second peripheral face contacts the second interior end surface.