| 摘要 |
A wave spring, a friction device including the same, and an automatic transmission including the friction device are provided to maximize lifetime of a wave spring by forming an insertion part in a free terminal part of a piston. A cylinder type retainer(10) is coupled in a center(X) of an input axis. A cylinder type piston(12) is movably installed in the retainer. A pressure chamber(11) is formed in a rear surface of the cylinder type piston. A moving passage(10a) is formed in the retainer. A plurality of plates(14) is coupled in an inner circumference of the retainer. A cylinder type hub(16) is coupled in the center of the input axis. A plurality of friction discs(18) is movably coupled in an outer circumference of the hub. |
