| 摘要 |
The present invention relates to a frictional engagement apparatus comprising a first frictional engagement unit ( 42 ), a second frictional engagement unit ( 44 ) and being disposed axially spaced from the first frictional engaging unit, and one case ( 40 ) for supporting the first and the second frictional engagement unit non-rotatably circumferentially but shiftably axially relative thereto. One retaining ring ( 51 ) is fitted to the case to be located between the first and second frictional engagement unit, the retaining ring being abutted to the nearest first friction plate and/or the second friction plate to stop an approaching shift of the first frictional engagement unit and/or the second frictional engagement unit. At a portion of the retaining ring remote from the case a recess ( 51 a) is formed for allowing an elastic deformation in a direction decreasing thickness thereof, when the first and second frictional engagement units approach to each other.
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