Patent ID: 6170625
Filing Date: 2001-01-09
Classification: F16D,F16H

Abstract:
A pulley unit for use around a shaft that extends in an axial direction, the pulley unit comprising:a) inner and outer concentric ring bodies that define an annular space therebetween;b) a one-way clutch, interposed in the annular space between the inner and outer ring bodies, the one-way clutch including:1) a member mounted on said inner concentric ring body, said member having:i) an axial end face with a recessed part; andii) a cam face forming a wedge space;2) a cage having an axial end face with a projecting part that is fit to the recessed part so as to restrain circumferential motion of the cage; and3) a roller and an elastic member accommodated in the wedge space, said roller locking said one way clutch when said outer concentric ring body is rotated faster than said inner concentric ring body and said roller unlocking said one way clutch and engaging said elastic member when said outer concentric ring body is rotated slower than said inner concentric ring body; andc) a rolling bearing provided on both sides of the one-way clutch in the annular space so as to restrain axial movement of the one-way clutch, each of said rolling bearings including an inner ring mounted on said inner concentric ring body and said projecting part of said cage being pressed between said member of said one-way clutch and said inner ring of only one of said rolling bearings.