Patent ID: 7225726

Claim:
A piston for an automatic transmission, comprising a first piston member forming a cylindrical portion and a second piston member forming a bottom portion, wherein an improvement comprises: said first piston member having a plurality of engaging grooves formed in one of opposite axial end portions thereof, each of said engaging grooves having a radial surface extending in a radial direction of said first piston member; said second piston member having a plurality of elongate claws which extend in a circumferential direction thereof and which respectively correspond to said plurality of engaging grooves; and each of said plurality of elongate claws having a free end portion and a fixed end portion, and is bent in an axial direction of said second piston member such that said free end portion is spaced from said fixed end portion in said axial direction toward an open end of said piston, said each elongate claw having a first engaging lug which is formed at said free end portion and which is held in engagement with a corresponding one of said engaging grooves and in pressing contact with said radial surface of said corresponding engaging groove.