| 摘要 |
An alternator of the present invention is mounted on an automotive vehicle to supply electric power to an on-board battery and electric loads. The alternator is composed of a housing, a stator fixedly held in the housing, a rotor rotatably supported in an inner bore of the stator, and other associated components. Alternating current generated in the stator is rectified into direct current and supplied to the on-board battery and electric loads. A cooling fan is connected to an axial end surface of the rotor. The cooling fan includes an annular portion extending in the axial direction to overlap with a bearing holder formed in the housing. A small annular gap is made between the annular portion and the bearing holder. Plural projections extending from the annular portion in the outer radial direction are formed integrally with the annular portion. Foreign particles are prevented from entering into the bearing by the annular portion having the projected portions.
|
