| 摘要 |
The present invention provides a multi-plate clutch comprising drive plates which are coaxially disposed within a clutch housing and to which friction materials are fixed, driven plates which are alternately arranged with the drive plates and a piston having an urging surface for providing an axial load to engage the drive plates and the driven plates with each other and wherein a plurality of urging portions protruding toward the driven plate are formed on the urging surface of the piston and the urging portions are provided in correspondence to an arrangement of spline projections provided on an outer periphery of the driven plate un-equidistantly along a circumferential direction.
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