Patent ID: 6830137
Filing Date: 2004-12-14
Classification: F16H

Abstract:
A pulley unit comprising:a pulley; a shaft relatively rotatable with said pulley and concentrically arranged inside of said pulley; a one-way clutch interposed in an annular space between said pulley and said shaft; and a ball bearing arranged adjacent to said one-way clutch in an axial direction in said annular space, said ball bearing having an inner ring and an outer ring; wherein raceway curvatures of said inner and outer rings of said ball bearing are set to not less than 50.5% and not more than 52.0%, and said ball bearing is disposed in one side of said one-way clutch, while a roller bearing is disposed in the other side of said one-way clutch, and a radial internal clearance after mounting of said ball bearing is set to a smaller value than a radial internal clearance after mounting of said roller bearing.