| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power transmission device having a reduced size and suppressed play in a rotating direction of a plug with respect to a socket. <P>SOLUTION: The power transmission device includes the plug, the socket and a sleeve, wherein a ball is fitted in a through-hole of the socket. The ball is held movably between a locked position where part of the ball engages with a recessed portion to prevent the rotation of the plug relative to the socket and the movement thereof toward the rotational center axis when the sleeve is moved in one of the reciprocating directions and an unlocked position where part of the ball can disengage from the recessed portion to permit the movement of the plug relative to the socket toward the rotational center axis when the sleeve is moved in the other direction. When part of the ball engages with the recessed portion, the ball abuts on one position of each of the recessed portion, the peripheral wall of the through-hole and the sleeve, namely, on totally three positions, and is held thereon. A flat surface including three contact points which abut on the ball traverses a reference flat surface including the rotational axis of the plug and the center of the ball. <P>COPYRIGHT: (C)2009,JPO&INPIT |
