Patent ID: 8235198

Claim:
A hydraulic clutch assembly for a motor vehicle driveline, the clutch assembly comprising: an input member ( 31 ), an output member ( 124 ) and a friction clutch pack ( 94 ) operably disposed therebetween for controlling torque transfer between the input and output members ( 31 , 124 ); a first fluid circuit ( 140 ) containing hydraulic based fluid at a first pressure and being in fluid communication with the friction clutch pack ( 94 ) for lubrication thereof; a second fluid circuit ( 49 ) having a reservoir ( 104 ) and being in fluid communication with the first fluid circuit ( 140 ) for replenishing the reservoir ( 104 ) with the hydraulic based fluid at a second pressure that is less than the first pressure; a motor ( 50 ) and a gear train ( 54 , 58 ), the gear train ( 54 , 58 ) having an input force driven by the motor ( 50 ) and an output force; a first piston ( 92 ) in fluid communication with the second fluid circuit ( 42 ) for delivering the hydraulic based fluid from the reservoir ( 104 ) to the first piston ( 92 ), the first piston ( 92 ) operatively driven by the output force to displace the hydraulic based fluid; and a second piston ( 128 ) translated by the hydraulic based fluid displaced by the first piston ( 92 ) to actuate the friction clutch pack ( 94 ).