| 摘要 |
[Object] To keep an air-gap between an electromagnetic clutch and a magnet within a predetermined range even if a camshaft vibrates in a radial direction. [Achieving Means] A bearing 26 and a stopper 51 are attached to a stepped part 20c of an inner cylinder part 20, the bearing 26 is supported by a C ring 28 inserted in a groove 44c of a rotational drum 44, a bearing 52 is attached to a stepped part 51a formed on the side of the outer periphery of the stopper 51, an inner sidewall 122c of an electromagnetic clutch 42 is supported by the bearing 52, the bearing 52 is supported by a clip 128 attached to an annular groove 127 formed in the inner sidewall 122c, the rotational drum 44 is supported by the bearing 26 prevented from moving in an axial direction, the electromagnetic clutch 42 is supported by the bearing 52 prevented from moving in the axial direction, and an air-gap AG between the electromagnetic clutch 42 and the magnet 45 of the rotational drum 44 is easily managed. |
