Patent ID: 7581628
Filing Date: 2009-09-01
Classification: F16D

Abstract:
1. An electromagnetic clutch comprising: first and second rotary members rotatable relative to each other; an electromagnet having a coil and a yoke; a rotor placed in close proximity to the electromagnet and through which magnetic field lines generated by the electromagnet are permeated, the rotor is associated with the first rotary member; a friction clutch operative to transfer drive torque between the first and second rotary members; an armature through which permeating magnetic field lines coming from the rotor are permeated to control coupling of the friction clutch; wherein the rotor includes first and second magnetic members for forming magnetic flux loops and the first and second magnetic members are made of materials different from each other, and wherein the first magnetic member is made of the material with a higher carbon content than that of the material of the second magnetic member.