| 摘要 |
A geared rotary actuator (1) including planet gears (2) disposed around a shaft (S), sun gears (8, 9) meshing with the planet gears (2) and with axially displaceable ramp members (10, 11) splined to the shaft (S) at least a pair of ball members (13, 14) are accommodated in pockets formed between the respective ramp members (10, 11) and a further member (12). Ramp surfaces (11a, 11b, 12a, 12b, 10a, 10b) are provided at the respective pockets to enable the ball members (13, 14) to ride out of the pockets upon an occurrence of an excessive torque thereby axially displacing the respective ramp members (10, 11) against a bias of springs (15, 16) coupled to the sun gears (8, 9) through planet gear radial support members (40 integrally formed with the sun gears (8, 9) thereby disconnecting a torque path through the actuator (1). Axial support for the radial support members (4) and ramp members (10, 11) is provided by struts (17, 18) fashioned as pins displaceable between an axial position and a transverse position upon the occurrence of excessive torque.
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