| 摘要 |
<p>PROBLEM TO BE SOLVED: To attain compactness and provide high torque by providing a nonagonal hole in a rotary friction plate so as to be the same shape as a bearing part for synchronous rotation therewith. SOLUTION: A bearing part 1b is a nonagonal shape. Each rotary friction plate 2, 4, 6 has a hole of the same nonagonal shape as the bearing part 1b for synchronous rotation therewith. A device main body mounting plate 3 and a fixing friction plate 5 are formed of a circular hole for rotatably supporting the bearing part 1b. The mounting plate 3 is formed of an engaging hole 3a, to which an engaging projection 5a formed in the fixing friction plate 5 is engaged, and a rotary shaft 1 is rotated. The bearing part 1b can be made to be small diameter since the bearing part 1b is made into nonagonal shape and the rotary friction plates 2, 4, 6 synchronously rotating therewith have nonagonal holes. Moreover, high torque is provided since contact area of the rotary friction plates 2, 4 contacting to the device main body mounting plate 3 and the fixing friction plate 5 is increased.</p> |
