| 摘要 |
A power transmission has a drive side rotatable member having a plurality of tapered radial concave portions with each having a pair of tapered surfaces. The plurality of tapered radial concave portions are disposed in a radial direction along a radial axis of the drive side rotatable member. A driven side rotatable member is connected to a rotary shaft and has a plurality of radial and axial concave portions disposed in a radial direction along a radial axis of the driven side rotatable member. A plurality of balls are each moveable between each of the plurality of tapered radial concave portions and each of the plurality of radial and axial concave portions. A spring is provided on the driven side rotatable member. Further, a ring having an inclined surface is urged by the spring, whereby the ring presses each of the plurality of balls at a point at which the inclined surface is formed. The ring presses each of the plurality of balls to each of the plurality of tapered radial concave portions and to the driven side rotatable member when torque is transmitted. Further, the ring presses each of the plurality of balls to each of the pairs of tapered surfaces of each of the plurality of tapered radial concave portions and to the inclined surface of the ball pressing ring in order to move each of the balls into each of the plurality of radial and axial concave portions when a torque is interrupted. Accordingly, the present invention has a structure which may maintain torque in an interrupted condition once torque is interrupted.
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