Patent ID: 7284647
Filing Date: 2007-10-23
Classification: F16D,F16H

Abstract:
1. A clutch device for an automatic transmission, comprising (a) a drum supporting frictional coupling elements, (b) a piston disposed radially outwardly of said drum and cooperating with the drum to define a hydraulic pressure chamber, (c) a shaft to which said drum is fixed, and (d) a balancer disposed on one side of said piston which is remote from said hydraulic pressure chamber, said balancer cooperating with said piston to define therebetween a canceling chamber, said clutch device being characterized in that: said shaft has a radial flange portion, and said drum has a stepped portion and is fixed to said shaft such that said stepped portion of the drum and said radial flange portion of the shaft cooperate to define therebetween an oil sump; and said drum further has at least one oil hole for communication between said oil sump and said canceling chamber.