Hydraulic double clutch

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.