Patent ID: 7350635

Claim:
Hydraulic double clutch for a transmission of an engine, the transmission having an outer shaft and a concentrically arranged inner shaft comprising: a stationary stator; a clutch housing having a drive can driven by the engine; a first hydraulically activated clutch including a first clutch pack driving an inner drum connected to the outer shaft; a second hydraulically activated clutch including a second clutch pack driving an outer drum connected to the inner shaft; a central hub connected to the clutch housing and having a web separating the juxtaposed clutch packs; a first piston-cylinder unit including a first clutch piston being activated by a first hydraulic activation chamber disposed between a first cylinder and one side of the first clutch piston acting on the first clutch pack; a second piston-cylinder unit including a second clutch piston being activated by a second hydraulic activation chamber disposed between a second cylinder and one side of the second clutch piston acting on the second clutch pack; balancing means including: a first balancing chamber disposed on the other side of the first clutch piston; and a second balancing chamber disposed on the other side of the second clutch piston; wherein the first and the second balancing chambers are fluidly connected to each other by distribution holes in the central hub to form a common balancing room and to connect to a common balancing oil passage in the stator; wherein the connected balancing chambers have an own oil supply from a balancing cavity located in the stator above an inlet into the balancing chambers; and wherein sealing rings are disposed between the stator and the piston cylinder units radially inside the piston-cylinder units at the smallest possible diameter thereof.