Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Hironobu Imaizumi0
Shigeo Tsuzuki0
Hiroyuki Nozaki0
Yukitoshi Ogawa0
Takayuki Ishikawa0
Akihiko Kita0
Date of Patent
October 21, 2008
0Patent Application Number
120077320
Date Filed
January 15, 2008
0Patent Primary Examiner
Patent abstract
A cushion plate is provided, for example, between a piston of a hydraulic servo and an adjacent friction plate in a frictional engagement element of an automatic transmission. The cushion plate is deflected by a pressing force of the piston to absorb an engagement shock. The cushion plate includes a main body portion formed into a belleville-spring shape, and a plurality of pawls that extend from the outer periphery of the main body for spline engagement with a member that is splined to, for example, the friction plate. A side wall of each pawl is formed with a curved recess extending circumferentially of the cushion plate and located adjacent the juncture (base) of the pawl at the outer periphery of the main body.
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