| 摘要 |
<p>A working chamber (19) filled with a silicone oil is provided therein with first resisting plates (21) spline-fitted around the outer circumferential surface of a first transmission shaft (3), and second resisting plates (23) spline-fitted on a second transmission shaft (9). The outermost resisting plates (21, 23) are held at their respective outer sides by a clamp means consisting of annular members (27, 29). These annular members (27, 29) are operatively connected to a piston consisting of the first transmission shaft (3), a side plate (11) and a stopper ring (25). When this piston is thrust-moved, the distance between the annular members (27, 29) decreases to clamp the block, in which the first and second resisting plates (21, 23) are arranged, and thereby bring these resisting plates (21, 23) into close contact with one another so that a set frictional force is obtained.</p> |
