| 摘要 |
Two coaxial clutch members, one driving and one driven, are normally coupled for joint rotation by several peripherally spaced rotary coupling elements projecting under a resilient biasing force into aligned sets of recesses thereof, at least one of these sets having camming edges by which the coupling elements are dislodged against their biasing force when the driven clutch member tends to lag behind the driving clutch member in the event of an overload. One clutch member, or a guide member entrained thereby, has peripherally spaced-apart lodgments which are aligned with its recesses at least during normal operation and confine the cammed-out coupling elements under overload conditions; the guide member may be a cage operatively connected with both clutch members through a planetary-gear transmission so as to rotate about their axis at a speed intermediate those of the two clutch members when they are decoupled from each other.
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