| 摘要 |
An electromagnetic clutch (1) includes: a rotor (4); an armature plate (5) that is disposed to face the rotor (4) ; an excitation coil (3) that is accommodated on the inside of the rotor (4), and generates an attracting force attracting the armature plate (5) onto the rotor (4); a temperature fuse (15) that is disposed on the excitation coil (3) side further than a side end surface (4b) of the rotor (4) and blocks the electric connection to the excitation coil (3) when exceeding a predetermined temperature; an outer magnetic blocking portion (21) and an inner magnetic blocking portion (22) on the side end surface (4b) of the rotor (4) ; and an intermediate magnetic blocking portion (23) in the armature plate (5) in a position between the outer magnetic blocking portion (21) and the inner magnetic blocking portion (22), in which an annular groove (25) is formed on the side end surface (4b) so as to include the inner magnetic blocking portion (22), and in which a friction member (26) protruding from the side end surface (4b) is disposed in the annular groove (25). The side end surface (4b) may have a center concave shape. |
