Patent ID: 6935481

Claim:
Clutch device comprising: a pressure piston ( 1 ) axially moving to engage a clutch ( 4 , 9 , 8 , 10 , 27 ), said pressure piston ( 1 ) being guided to slide in a housing ( 5 , 15 . 1 , 15 . 2 , 15 . 3 , 15 . 4 ), said housing ( 5 , 15 . 1 , 15 . 2 , 15 . 3 , 15 . 4 ) and said pressure piston ( 1 ) enclosing a pressure chamber ( 11 ), which can be pressurized with a pressurizing agent ( 24 ) to generate the pressure force, balance piston ( 2 ) for generating a counterpressure on said pressure piston ( 1 ), said balance piston is essentially ring-shaped with fingers ( 30 . 2 ) which are having ends each including a detent ( 31 . 2 ) pointing radially outwardly, said balance piston ( 2 ) being hold essentially immobile to said housing ( 5 , 15 . 1 , 15 . 2 , 15 . 3 , 15 . 4 ) when said clutch ( 4 , 9 , 8 , 10 , 27 ) is put into motion in the sliding direction of said pressure piston ( 1 ), said housing ( 5 , 15 . 1 , 15 . 2 , 15 . 3 , 15 . 4 ), said pressure piston ( 1 ) and said balance piston ( 2 ) enclosing a balance chamber ( 12 ) that can be pressurized with a counterpressurizing agent to generate the counterpressure force, and a latching mechanism ( 28 . 1 , 28 . 2 , 28 . 3 , 29 . 1 , 29 . 2 , 29 . 3 , 30 . 1 , 30 . 2 , 30 . 3 , 31 . 1 , 31 . 2 , 31 . 3 ) to hold said balance piston ( 2 ) immobile to said housing ( 5 , 15 . 1 , 15 . 2 , 15 . 3 , 15 . 4 ) when said clutch ( 4 , 9 , 8 , 10 , 27 ) is put into motion in the sliding direction of said pressure piston ( 1 ).