Patent ID: 7055665

Claim:
A one-way clutch comprising: an outer ring fitting member comprising a hole, in which a recess portion is formed at an inner peripheral face of the hole; a shaft passed through the hole of the outer ring fitting member; a thin plate having a substantially uniform thickness and forming a shell-type annular outer ring comprising a plurality of cam faces on an inner peripheral face thereof, which is fitted into the hole of the outer ring fitting member and through which the shaft is passed; a plurality of rollers arranged between the shaft and the annular outer ring so as to correspond to the plurality of cam faces, respectively; and an annular retainer for retaining the plurality of rollers fitted to the outer ring, the retainer comprising, an axially projected portion projected from the outer ring in an axial direction thereof, and a projection projected from the axially projected portion in a radial direction thereof, which is fitted to the recess portion of the outer ring fitting member to prevent the retainer from rotating with respect to the outer ring fitting member, wherein each of said plurality of cam faces includes an expanded portion formed by expanding a cylindrical portion of said thin plate to an outer peripheral side to recess an inner face side thereof, and wherein said expanded portion is fitted to said recess portion.