Patent ID: 8739952
Filing Date: 2014-06-03
Classification: F16D

Abstract:
1. An electromagnetically operated friction disk clutch for a motor vehicle comprising: a rotor, an armature disk that is attracted against the rotor by means of magnetic forces, a switchable electric coil for applying a magnetic force to the armature disk, permanent magnets for applying an attraction force to the armature disk against the rotor so that the armature disk rests against the rotor, and clutch elements that are matched to one another in such a way that the armature disk remains in a position in which it is separated from and rotatable relative to the rotor when a switching force is applied to the armature disk by the switchable electric coil counter to the force of the permanent magnets, whereby the switching force separates the armature disk from the rotor, and subsequently the switching force of the switchable electric coil is removed, wherein the armature disk and the rotor are only brought into physical contact by application of the switching force of the switchable electric coil, wherein the permanent magnets are positioned between magnetically conductive clutch elements, where one magnetically conductive clutch element positioned between the permanent magnets and the rotor directs magnetic flux from one pole face of the permanent magnets to the rotor, and another magnetically conductive clutch element positioned opposite to a side of the permanent magnets facing away from the rotor directs magnetic flux from the other pole face of the permanent magnets to the rotor, and wherein the magnetically conductive clutch elements are permanently connected to a static part of assembly which is to be driven.