| 摘要 |
PURPOSE:To raise the mechanical reliability, by fitting an outside oil seal ring to the piston disc in the caption using the rim part of a piston disc made of a metal plate, and integrating them in one body. CONSTITUTION:A clutch disc pressing means is formed by folding and shaping a rim 13 around a piston disc 12. At the same time, the base of this rim 13 is bent toward the inner circumferential surface side of the rim 13, to be U-shaped, so as to form a ring groove 32 shaped by the U-shaped curved wall 31, on the outer circumferential surface of the rim 13, and an outside oil seal ring 15 is fitted in the ring groove 32. This outside oil seal ring 15 adheres closely to the U-shaped curved wall 31 by the shrinking force of itself, and is held in the groove 32 stably. Consequently, the strength of the piston disc 12 and the strength of the rim 13 serving as a clutch disc pressing means are increased, and the mechanical reliability is raised. |
