| 摘要 |
A rotary coupling comprises a driving part and a driven part, for transmission of driving torque between them; a fixed part in which the driving and driven parts are each rotatable coaxially; and a set of coupling members. The coupling members are carried by the driving part and are seated in recesses in the driven part so as to be in torque-transmitting engagement therewith. The coupling members are juxtaposed to an annular braking surface of the fixed part, and can independently move into and out of engagement with the braking surface. A driving torque, applied by the driving part to the coupling members, is transmitted by the latter to the driven part without the coupling members engaging the braking surface. A reverse torque, applied by the driven part to the coupling members, moves the latter into wedging engagement with the braking surface, locking up the coupling.
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