Alternator for vehicle.

摘要

A pulley-side bearing (10) is held by a boss portion (1a) which extends toward a space inside the pulley (3). The loading center of the pulley (3) placed at a prescribed distance from the loaded center of the pulley-side bearing (10) so that a counter pulley-side bearing (11) is biased to an inner surface of a boss portion (2a), thereby generating a frictional force against creeping of the counter pulley-side bearing (11). Specific grease including ether base lubricating oil is filled in the bearings (10, 11) so that a single row bearing (10) may be used as the pulley-side bearing (10) and creeping of the counter pulley-side bearing (11) may be prevented. 2 pi /3 electric-angle-pitch multi phase windings and a counter pulley-side cooling fan (8') contribute to reduction in the axial dimension of the alternator.