Abstract: Provided is an electromagnetic clutch, in which a plurality of magnetic flux shielding slits extending in the axial direction and arcuately in the circumferential direction are formed individually in a rotor and an armature, and in which the magnetic flux by the excitation of a coil inserted on the anti-armature side of the rotor is passed from the non-slit portion of the rotor to the non-slit portion of the armature and from the non-slit portion of the armature to the non-slit portion of the rotor, so that a magnetic attraction is generated to bring two frictional faces into press contact with each other and so that the two frictional faces are separated by the demagnetization of the coil. The slits of at least one of the rotor and the armature are formed to change in such a taper shape that the slit width at the frictional face side may be smaller than that at the anti-frictional face side.

Abstract: An electromagnetic clutch for separably coupling a drive source and a rotary shaft has a rotor to be disposed in the outside of the rotary shaft concentrically therewith. The rotor is rotated by a drive source and accommodates an electromagnetic coil. The electromagnetic clutch has an armature plate that is attracted toward the rotor by an electromagnetic force generated by the electromagnetic coil so as to adhere to the rotor. Furthermore, the electromagnetic clutch has a coupler for coupling the armature plate and the rotary shaft to each other. The coupler includes a center part to be coupled to the rotary shaft and an elastically-deformable outer part for coupling the center part to the armature plate, the outer part being extended from the center part and elastically deformed when the armature plate is attracted to the rotor.

Abstract: The present invention provides an electromagnetic clutch for compressor which can align axial centers of a core ring and a rotor with high accuracy. In the present invention, since a support portion 22c for supporting a rotor 11 is provided integrally on a core ring 22, the core ring 22 can be formed coaxially with the support portion 22c, and the rotor 11 supported by the support portion 22c and the core ring 22 can be arranged on the same axial center without separate alignment. In this case, since a fixed portion 22b is engaged with an engagement portion 4c of a compressor body 4 so that movement in the radial direction is regulated, the core ring 22 is not displaced in the radial direction with respect to the compressor body 4, and the axial centers of the core ring 22 and a rotational axis 1 can be aligned with high accuracy. By this, a gap G between the core ring 22 and the rotor 11 can be made smaller, and the permeability between the core ring 22 and the rotor 11 can be improved.

Abstract: An electromagnetic clutch for separably coupling a drive source and a rotary shaft has a rotor to be disposed in the outside of the rotary shaft concentrically therewith. The rotor is rotated by a drive source and accommodates an electromagnetic coil. The electromagnetic clutch has an armature plate that is attracted toward the rotor by an electromagnetic force generated by the electromagnetic coil so as to adhere to the rotor. Furthermore, the electromagnetic clutch has a coupler for coupling the armature plate and the rotary shaft to each other. The coupler includes a center part to be coupled to the rotary shaft and an elastically-deformable outer part for coupling the center part to the armature plate, the outer part being extended from the center part and elastically deformed when the armature plate is attracted to the rotor.