Patent ID: 6695113
Filing Date: 2004-02-24
Classification: F16D

Abstract:
A viscous fluid coupling comprising:a coupling housing which can be fixed to a drive shaft, an operating chamber formed in the coupling housing, a rotor arranged in said operating chamber for rotation with respect to said coupling housing, a storage chamber in said coupling housing, a fluid connection between said operating chamber and said storage chamber, said fluid connection comprising an opening, a valve arrangement which influences said fluid connection, said valve arrangement comprising a closure element which can be moved relative to said opening, and an electromagnetic actuating device comprising an electromagnet, a rotary armature arranged immediately next to said electromagnet to form a magnetic flux path including the rotary armature when the electromagnet is excited and a pair of magnetic pole shoes fixed on said coupling housing, said pole shoes being arranged in an axial plane with said rotary armature, said rotary armature and said closure element being rotationally fixed on a common shaft which is rotatably mounted in said coupling housing.