| 摘要 |
PURPOSE:To enable rapid discharge of oil in a hydraulic chamber without effect of centrifugal force by providing a long hole accommodating a ball movable by flow of oil on a supply-discharge passage which is curved and provided on a hub unit of a clutch drum. CONSTITUTION:A long hole 19 which is long to the peripheral direction of a hub unit 3 is provided on a supply-discharge passage 13 having an atmosphere opening mechanism. And a first communicating path 20 whose one end is opened in the long hole 19 and the other is communicated to a hydraulic chamber 12, a second communicating path 21 whose one end is opened in the long hole 19 and the other is communicated to an oil supply path 18, and an open path 22 whose one end is opened in the long hole 19 and the other is opened in atmosphere are provided. In the long hole 19, a check ball 23 opening and closing the open path 22 by moving by flow of oil is accommodated. |
