Patent ID: 7108113

Claim:
A rotation transmission apparatus with built-in one-way clutch comprising: an inner-diameter-side member that is fastened to the end of a rotating shaft; a cylindrical-shaped outer-diameter-side member that is located around the inner-diameter-side member such that it is concentric with the inner-diameter-side member; a one-way clutch that is located between the middle in the axial direction of the outer peripheral surface of the inner-diameter-side member and the middle in the axial direction of the inner peripheral surface of the outer-diameter-side member; such that the one-way clutch freely transmits rotational power between the outer-diameter-side member and the inner-diameter-side member only when the outer-diameter-side member rotates relative to the inner-diameter-side member in a specified direction, and a pair of support bearings that are located on the axially opposite sides of the one-way cutch between the outer peripheral surface of the inner-diameter-side member and the inner peripheral surface of the outer-diameter-side member, such that the pair of support bearings support the radial load that is applied to the outer-diameter-side member, while at the same time making it possible for relative rotation between the inner-diameter-side member and the outer-diameter-side member, wherein a protruding section is formed all the way around one of the inner peripheral surface of the outer-diameter-side member and the outer peripheral surface of the inner-diameter-side member at the axially middle section thereof such that it protrudes in the radial direction from that surface, and the one-way clutch has a clutch retainer, wherein part of the one peripheral surface that includes the peripheral surface of the protruding section is engaged with part of the peripheral surface of the clutch retainer in an interlocking manner, so that the clutch retainer is capable of rotating together with the member with the protruding section, wherein retaining sections are formed in the axially opposite end edges of the clutch retainer, in the sections that protrude further in the axial direction than the axially opposite end edges of the protruding section, such that they protrude toward the one peripheral surface, and that the retaining sections hold the protruding section on the opposite sides in the axial direction so as to limit displacement in the axial direction of the clutch retainer and to prevent the axially opposite end surfaces of the clutch retainer from coming in contact with members rotating relative to the clutch retainer, wherein at least one of the retaining sections is elastically deformed such that the clutch retainer is fitted onto the inner-diameter-side member or fitted into the outer-diameter-side member, and wherein the clutch retainer is made of a synthetic resin material with reinforcement fibers mixed therein such that the percentage of the mixed-in reinforcement fibers is 25% or less.