| 摘要 |
A fluid-powered actuator having a body with an interior helical groove, a drive member supported for rotary movement relative to the body, and a carrier reciprocally mounted within the body. In a first embodiment, the carrier rotatably retains first and second rollers in a fixed axial and circumferential position relative to the carrier, with the one roller engaging the body groove and the other roller engaging a helical groove formed on the drive member. The carrier includes a piston portion. In an alternative embodiment, only a single roller is used for engaging the body groove and the carrier has a key member which projects into a keyway recess of the drive member to permit substantially uninhibited axial movement of the carrier relative to the drive member as the carrier reciprocates within the body while coupling the rotational drive of the carrier to the drive member.
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