Patent ID: 9739318
Date: 2017-08-22
CPC Classifications: B23P,B29C,B29K,F16D

Claim:
1. A clutch piston assembly for an automatic transmission of an automobile, comprising: a housing; an at least one piece piston body which extends about an axis and has at least one of a radially inwardly facing surface and a radially outwardly facing surface; at least one seal engaged with said piston body and extending either radially outwardly from said radially outwardly facing surface or radially inwardly from said radially inwardly facing surface and sealed against a wall of said housing to define an expandable cavity on one axial side of said one piece piston body; and said seal being made of polyetheretherketone (PEEK) or polyaryletherketone (PAEK) and being molded to present a flat base which extends parallel to said axis and to present a curved lip which extends radially from said flat base and curves axially when in a resting condition; and wherein said curved lip is curved axially towards said expandable cavity to present an annular pocket between said lip and said piston body.