Cam-helical actuator with backlash elimination

Details Cam-helical actuator with backlash elimination Cam-helical actuator with backlash elimination

F - Mech Eng,Light,Heat,Weapons

15

B

138/86

F15B 15/00 (2006.01) F01B 3/06 (2006.01) F15B 15/08 (2006.01) F16H 25/20 (2006.01) F16H 25/24 (2006.01)

Patent

CA 2000220

CAM-HELICAL ACTUATOR WITH BACKLASH ELIMINATION Abstract of the Disclosure The fluid-powered actuator having a body, an axially extending rotatable shaft with a plurality of helical grooves, and an annular piston sleeve reciprocally mounted within the body and receiving the shaft therethrough. The piston sleeve has a plurality of radial bores extending fully therethrough with an inward open end adjacent to the grooved shaft. Guide pins are rotatably disposed in each of the piston sleeve bores and ride in the shaft grooves. An annular carrier is reciprocally mounted within the body coaxial with the piston sleeve and is adjustably axially movable relative thereto. The carrier has a plurality of radial bores extending fully therethrough with an inward end adjacent to the grooved shaft. Guide pins are rotatably disposed in each of the carrier bores and ride the shaft grooves. Rotation of the carrier is prevented relative to the piston sleeve. An adjustably rotatable collar extends between the piston sleeve and the carrier to selectively set the axial distance between the piston sleeve and collar to eliminate backlash. The collar also serves to limit the radial outward movement of the pins in the bores. Lock nuts are provided to prevent axial movement of the carrier relative to the piston sleeve during fluid-powered operation.

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