| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a piston of high durability without generating a stress concentration part in case of applying pressing force to a multidisk clutch member. SOLUTION: A reverse clutch R/C arranged in an internal diametric side of a clutch drum 14 is provided with a plurality of piston pressing parts 26d formed in comb shape to serve partly as a reverse clutch use piston 26 to be extended toward a first multidisk clutch member from an outer edge. In an internal peripheral surface in the vicinity of a tip end surface of a plurality of these piston pressing parts, a peripheral groove 44 is formed. In a high clutch H/C arranged in an internal diametric side of the reverse clutch, a part of a high clutch use clutch member is made to pass in transfixing shape from a slit 26c between the piston pressing parts 26d, a rotational direction is engaged with the clutch drum, also a snap ring 46 for locking a retaining member 24 is mounted in the peripheral groove. In a tip end surface of each piston pressing part 26d, a notched part is formed.</p> |
