Patent ID: 9291216
Filing Date: 2016-03-22
CPC Classification: F16D

Claim Text:
1. An electromagnetic clutch, comprising: a rotating shaft; a pole body having an exciting coil; a rotor located at a position facing the pole body along an axial direction of the rotating shaft; and an armature movable in the axial direction of the rotating shaft in a direction in which the armature alternately touches and releases the rotor, the armature being capable of forming a magnetic circuit along with the pole body and the rotor, wherein when the exciting coil is in an excited state, the armature is moved in the axial direction of the rotating shaft by an electromagnetic attraction force so as to be pressed against a friction surface of the rotor, and the rotating shaft comprises: an input side shaft portion at an input side and an output side shaft portion at an output side; the input side shaft portion consisting of a non-magnetic material having a sufficient strength for supporting rotation of the armature and the rotor; and the output side shaft portion consisting of a magnetic material engaged with the input side shaft portion in such a manner that the output side shaft portion cannot be rotated relative to the input side shaft portion, wherein the output side shaft portion is not extended to the input side across the friction surface of the rotor.