Patent ID: 8678156

Claim:
Shiftable friction clutch ( 1 a , 1 b ) for actuation with a flowable pressure medium, comprising two coupling elements ( 2 , 3 ) which are mounted rotatably about the same axis of rotation and are able to be brought into frictional contact with one another in order to transmit a rotary motion, and a pressure chamber ( 4 ) located in the clutch ( 1 a , 1 b ), the volume of which pressure chamber ( 4 ) is variable by means of an axially movable piston ( 5 ), the piston ( 5 ) being held in a predefined position by the force of a disk spring ( 6 ) which is mounted inside the pressure chamber, wherein the disk spring ( 6 ) pulls an outer coupling element, so that conical friction surfaces of the coupling elements ( 2 , 3 ) come into frictional contact with one another.