Patent ID: 6866131

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 and a second coupling part, wherein said first and second coupling parts 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 and second plates connectable to said second coupling part in a rotationally fast way, wherein said first and the second plates are arranged in the 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 in which said second plates are connected to the second coupling part in a rotationally fast way, wherein said connecting means comprises at least one push rod which extends along the length of said annular chamber and, when being moved into the closed position synchronously acts axially on the end faces of said second plates.