| 摘要 |
PURPOSE: Structure for improving durability of a piston of an automatic transmission is provided to improve durability of the piston by absorbing impact between the piston and adjacent parts. CONSTITUTION: In structure for improving durability of a piston(108) of an automatic transmission, shock-absorbing units are installed at the ends of an apply part and a stopper part of the piston. The shock-absorbing units are friction materials(1,3). When the piston is moved toward plates(104), to touch the plate and disks(106) by hydraulic pressure applied to an oil hole(110) of a retainer, the friction material absorbs the impact force contacted with the plate by hydraulic pressure while the friction material copes with the rotational difference of the piston and the plate. Thus, breakage of the apply part of the piston is prevented. If the hydraulic pressure supplied to the oil hole is released, the piston is moved back by the elastic force of return springs(112). The friction material adhered to the rear stopper part absorbs the impact when the piston touches with the retainer. Thus, breakage of the piston is prevented.
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