Patent ID: 8387766

Claim:
A wet clutch arrangement, comprising: a housing; a first friction face formation coupled to the housing for rotation around an axis of rotation; a second friction face formation coupled with an output member configured for rotation around the axis of rotation; and a pressing piston movable in a direction along the axis of rotation which, together with the housing, defines a pressure fluid space, wherein a change in fluid pressure in the pressure fluid space causes a frictional interaction between the first and the second friction face formations, wherein an operant fluid application surface of the pressing piston is in a range of about 15000 mm 2 to about 25000 mm 2 for generating a force acting upon the pressing piston, wherein: 0.85 <D R /D A <1.5, where: D R is a diameter of the pressing piston in an area configured to act upon the first and the second friction face formations that causes the frictional interaction between the first and the second friction face formations; and D A is an outer diameter of the fluid application surface of the pressing piston.