| 摘要 |
A fluid-powered actuator for selectively rotating and linearly moving an external device with two fluid ports to communicate pressurized fluid thereto for its operation. The actuator includes a body having a rotatable shaft extending therewithin. The shaft has a chamber with a forward opening and a rearward wall. A first piston is mounted for reciprocal axial movement within said body and means are provided for transmitting torque between the body and shaft to produce rotational movement of the shaft in response to axial movement of the first piston. A second piston having bores extend fully therethrough extends within said shaft chamber and is supported for axial movement relative to said shaft. The external device is attached to the second piston at its forward end. Three rigid tubes have a rearward end portion fixedly positioned in bores in the shaft rearward wall and extend forward into the second piston bores a sufficient axial distance to maintain the tubes at least partially therewithin as the second piston axially reciprocates within said shaft chamber. The second piston is slidably disposed on the tubes which restrain the second piston against rotational movement. The tubes each have an interior conduit for communicating pressurized fluid between ports in the body and the external device and a remote side of the second piston. In an alternative embodiment, torque rods restrain the second piston against rotation.
|
