| 摘要 |
PROBLEM TO BE SOLVED: To improve the reliability and to reduce the abrasion by connecting a supporting element at a radially outer side of at least one supporting device, with an assembly attached to at least one supporting device, of the first and second assemblies. SOLUTION: In the axial direction, a ring piston 32 is supported by a housing 14 or a housing of a clutch 10 through a first bearing devcie 64. The bearing device 64 comprises a bearing ring 66 at a radially outer side, a bearing ring 68 at a radially inner side, and a plurality of bearing balls 70 existing therebetween, as a bearing element, the bearing ring 66 is engaged with the piston 32, and the bearing ring 68 is fixed to the housing 14 by means of a fixing ring 72 and the like. Corresponding thereto, a ring cylinder 34 is axially supported by a diaphragm spring 18 through a second bearing device 74 in a wall zone 44, and similarly comprises the bearing rings 76, 80. By applying this structure, the rotation substantially does not exist relative to an inertial system, the lubricant does not flow by the centrifugal force, and the abrasion can be reduced.
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