Patent ID: 6874605

Claim:
A controllable viscous coupling for generating a locking effect between two coupling parts rotatable relative to one another around a common longitudinal axis, for the driveline of a motor vehicle, comprising a first coupling part, a second coupling part, wherein the first and the second coupling part form a sealed annular chamber which is at least partially filled with a highly viscous medium, first plates connected to said first coupling part in a rotationally fast way, second plates connectable to said second coupling part in a rotationally fast way, wherein said first and second plates are arranged in said annular chamber so as to alternate in the longitudinal direction, controllable connecting means settable between an open position in which said second plates are freely rotatable relative to said second coupling part, and a closed position wherein said second plates are connected to the second coupling part in a rotationally fast way, and wherein said connecting means is held in said second coupling part and comprises at least one brake jaw which acts on said second plates, thereby radially loading said second plates on the outer circumference.