Patent ID: 7311188

Claim:
An electromagnetic clutch for separably coupling a drive source and a rotary shaft to each other, comprising: a rotor to be disposed in the outside of said rotary shaft concentrically therewith, said rotor being rotated by said drive source; an electromagnetic coil accommodated in said rotor; an armature plate allowed to be attracted toward said rotor by an electromagnetic force generated by said electromagnetic coil so as to adhere to said rotor; and a coupler for coupling said armature plate and said rotary shaft to each other, said coupler including a center part to be coupled to said rotary shaft, including a metal sleeve to be coupled to said rotary shaft, an elastically-deformable outer part comprising heat-hardening resin for coupling the center part to said armature plate, the outer part being made of resin that is insert-molded with said sleeve and being extended from the center part and elastically deformed when said armature plate is attracted to said rotor, wherein said coupler is joined to said armature plate at the deformable outer part, a plurality of metal rings embedded in said outer part by insert molding, and a plurality of rivets, each of which passes through a corresponding one of said metal rings to join said outer part and said armature plate to each other.