| 摘要 |
An actuator of the type utilizing an orbiting ring gear to drive an output shaft in which a rotatable clutch is provided for coupling and decoupling the ring gear to the output shaft. A bearing supported crank ring cooperates with a supporting clutch ring to hold the ring gear in a confined path when coupling of the ring gear to the output shaft is desired, and the clutch ring is rotatable to a position in which the ring gear can be moved out of driving engagement with the output shaft when decoupling is desired. Fluid actuated motors, arranged symmetrically with respect to the clutch ring, are operable to move the ring gear so as to drive the output shaft and centering pistons cooperate with the motors to decouple the ring gear from the output shaft when the clutch ring is in a position releasing the ring gear for movement out of engagement with the output shaft.
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