| 摘要 |
PROBLEM TO BE SOLVED: To eliminate backlash. SOLUTION: When an input side member 1 receives an input rotating power from a driving source to rotate, a part of the input rotating power is converted into an axial force by the fit between a nearly V shaped recessed cam 5a and a projected cam 5b, and an intermediate member 3 is axially displaced to the output side against a spring 4. As the intermediate member 3 is axially displaced to the output side, a friction clutch 7 is released, and the intermediate member 3 can rotate in relation to a stationary side member 6. On the other hand, when the driving source is stopped, the intermediate member 3 is axially displaced to the input side against pressing energizing force of the spring 4, and the friction clutch 7 is operated to restrict the intermediate member 3 in the direction of rotation with respect to the stationary side member 6 without causing backlash.
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