Patent ID: 7815029

Claim:
An electromagnetic clutch apparatus comprising: a multiplates clutch including an outer plate and an inner plate alternately arranged, and configured to control a torque transmission between rotating members by engaging the outer plate and the inner plate in an axial direction; and a nonmagnetic portion formed continuously along the axial direction and at a middle portion in a diameter direction of the multiplates clutch to form a magnetic path of an electromagnet surrounding the nonmagnetic portion in a circulating shape, wherein the multiplates clutch is divided in the diameter direction into at least two parts, wherein a nonmagnetic member is interposed between the parts to form the nonmagnetic portion, and wherein one of the outer plate and the inner plate is divided in a plate thickness direction and in a diameter direction into an outer diameter portion and an inner diameter portion, the outer diameter portion includes an outer diameter side piece, and the inner diameter portion includes an inner diameter side piece, the outer diameter side piece and the inner diameter side piece are opposed to each other in the axial direction, and the nonmagnetic member is interposed between the outer diameter side piece and the inner diameter side piece to integrate the outer diameter portion and the inner diameter portion.