Patent ID: 7100754
Filing Date: 2006-09-05
Classification: F16D,F16H

Abstract:
1. A pulley unit mounted around a shaft having a free end and a base end, the shaft extending, at the base end, in an axial direction from an alternator, the pulley unit when mounted on the shaft has a free end side near the free end of the shaft and a base end side near the base end of the shaft, the pulley unit comprising: inner and outer concentric ring bodies that define an annular space there between; a roller bearing located in the annular space at the free end side adjacent the free end of the shaft; a ball bearing located in the annular space at the base end side adjacent the base end of the shaft, the roller bearing having a comparatively large load carrying capacity as compared to the ball bearing, the ball bearing having a comparatively small load carrying capacity; a one-way clutch located in the annular space between the inner and outer ring bodies and between the roller bearing and the ball bearing, the one-way clutch including the roller bearing being having a cylinder in rolling contact with the outer surface of the inner ring body, axial movement of the holder of the one-way clutch being restricted by the inner ring body adjacent to the ball bearing, and a belt engaging the outer ring body at the free end side in a region including only the roller bearing and the one-way clutch.