Patent ID: 7478718

Claim:
Wet clutch, comprising: a stationary stator; a clutch housing having a drive can driven by an engine; a first hydraulically activated clutch including a first clutch pack driving an inner drum connected to an outer shaft, wherein the first clutch pack includes; a plurality of steel plates, and a plurality of friction plates being positioned between the steel plates and at least one first clutch piston acting on the first clutch pack wherein disc springs are positioned between the steel plates, the disc springs having an outer conical surface spaced from an inner conical surface; a second hydraulically activated clutch including a second clutch pack driving an outer drum connected to an inner shaft, wherein the second clutch pack includes: a plurality of steel plates, and a plurality of friction plates being positioned between the steel plates and at least one second clutch piston acting on the second clutch pack wherein disc springs are positioned between the steel plates, the disc springs having an outer conical surface spaced from an inner conical surface; a central hub connected to the clutch housing and having a web separating the juxtaposed first and second clutch packs; a first piston-cylinder unit including the first clutch piston being activated by a first hydraulic activation chamber positioned between a first cylinder and one side of the first clutch piston acting on the first clutch pack; a second piston-cylinder unit including the second clutch piston being activated by a second hydraulic activation chamber positioned 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 positioned on the other side of the first clutch piston; and a second balancing chamber positioned 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; and wherein sealing rings are positioned between the stator and the piston cylinder units radially inside the piston-cylinder units at the smallest possible diameter thereof.