| 摘要 |
In an electromagnetic clutch for selectively transmitting rotation of a pulley to a drive shaft having an armature by magnetic force attracting the armature to the pulley, the pulley is mounted by a bearing on a tubular support projecting from a side wall of a mount and an electromagnetic device is mounted through a supporting plate on the mount for generating a magnetic force to attract the armature to the pulley. In order to make assembly of the clutch easy, the supporting plate supports the electromagnetic device at an outer peripheral region on one surface and comprises a central boss projecting from the surface and extending around the tubular support to have a projecting end, an annular surface region in contact with the side surface of the mount, and a radial inner flange radially inwardly extending from the projecting end to form a central hole through which the tubular support extends. The bearing has an axial end in press contact with the radial inner flange and an opposite axial end engaging a snap ring fitted in a snap ring receiving groove of the tubular support, to thereby prevent the bearing and the supporting plate from moving in an axial direction on the tubular support between the side wall of the mount and the snap ring.
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