Abstract: A roller type one-way clutch includes an outer ring and an inner ring disposed concentrically with each other for rotation relative to each other, the outer ring having an axially extending annular inner peripheral cam surface, the inner ring being disposed in the outer ring and having an annular outer peripheral raceway surface, and a plurality of rollers disposed between the outer ring and the inner ring for transmitting torque between the outer peripheral raceway surface and the inner peripheral cam surface. The rolling surface of each of the rollers has a recess depressed toward the axis thereof over the entire circumference thereof. In an alternative arrangement, an axially extending annular inner peripheral raceway surface is provided on the outer ring and an annular outer peripheral cam surface is provided on the inner ring.

Abstract: A one-way clutch apparatus with torque transmission elements and biasing members in concave cams on one of the inner and outer races has a retainer rotatable in a circumferential direction relative to the one race, has circumferential grooves on the one race, and has block bearings between the races with radial projections that move circumferentially in corresponding grooves.

Abstract: A roller type one-way clutch comprising an outer ring and an inner ring radially spaced apart from each other and disposed concentrically with each other for rotation relative to each other, the outer ring having an axially extending annular inner peripheral cam surface, the inner ring being disposed in the outer ring and having an annular outer peripheral raceway surface, and a plurality of rollers disposed between the outer ring and the inner ring for transmitting torque between the outer peripheral raceway surface and the inner peripheral cam surface is characterized in that the rolling surface of each of the rollers has a recess depressed toward the axis thereof over the entire circumference thereof.

Abstract: A one-way clutch apparatus comprises an inner ring, an outer ring disposed to be coaxial with the inner ring and rotatable relatively thereto, a plurality of concave grooves formed in an axial direction in an inner peripheral surface of the outer ring, and block bearings engaging the respective concave grooves and keeping an interval between the inner ring and the outer ring. The concave groove takes such a configuration that a surface including two or more circular arc surfaces connects side surfaces extending in radial directions to a bottom surface extending in a peripheral direction, which configure the concave groove.

Abstract: In a one-way clutch apparatus comprising an inner race element having an outer peripheral surface on which either one of a concave cam and a cylindrical surface is formed, an outer race element having an inner peripheral surface on which the other of the concave cam and the cylindrical surface is formed, a torque transmission member interposed between the concave cam and the cylindrical surface for performing torque transmission between the inner race element and the outer race element, urging means for urging the torque transmission member, a bearing member adapted to maintain a space between the inner race element and the outer race element, and a retainer mounted on whichever element on the cam side having the concave cam, out of the inner race element and the outer race element, for maintaining the torque transmission member, the urging means and the bearing member, the retainer is rotatable in the circumferential direction relatively with the element on the cam side.

Abstract: A one-way clutch apparatus comprises an inner ring, an outer ring disposed to be coaxial with the inner ring and rotatable relatively thereto, a plurality of concave grooves formed in an axial direction in an inner peripheral surface of the outer ring, and block bearings engaging the respective concave grooves and keeping an interval between the inner ring and the outer ring. The concave groove takes such a configuration that a surface including two or more circular arc surfaces connects side surfaces extending in radial directions to a bottom surface extending in a peripheral direction, which configure the concave groove.