Abstract: A multipoint contact ball bearing in constructed to prevent damage to rolling surfaces of the balls and to ensure durability while maintaining radial load capacity. An inner raceway has a complex curved surface including a pair of side surface sections having a generating line shape with a radius of curvature larger than 50% of the ball diameter, and an inner raceway bottom section connecting inside end edges in the width direction of the side surface sections. The inner raceway bottom section is a concave curved surface having a generating line shape with a radius of curvature less than 50% of the ball diameter. The edges of both sides in the width direction of the inner raceway bottom section and the inside end edges of the inner raceway side surface sections are smoothly continuous, and finishing is performed on the inner raceway bottom section and the inner raceway side surface sections.

Abstract: The present invention achieves construction of a multipoint contact ball bearing that is able to prevent the rolling surfaces of the balls 4 from becoming damaged and can keep the durability of the bearing from decreasing while maintaining the radial load capacity even when large radial loads act and the rolling surfaces of the balls 4 coming in contact with the inner raceway bottom section 8a. The inner raceway 5a is complex curved surface that comprises a pair of inner raceway side surface sections having a generating line shape with a radius of curvature that is larger than 50% the diameter of the balls 4, and an inner raceway bottom section 8a that connects the edges of the inside end in the width direction of the pair of inner raceway side surface sections 7a; with the inner raceway bottom section 8a big a concave curved surface having a generating line shape with a radius of curvature R8 that is less than 50% the diameter of the balls 4.

Abstract: A one-way clutch includes a radially-outer annular member having an inner peripheral race surface, a radially-inner annular member having an outer peripheral race surface, plural torque-transmitting members interposed between the annular members such that they are selectively tiltable to first positions where they come into engagement with the race surfaces to transmit a torque and second positions where they come out of engagement with the race surfaces, a ribbon spring for biasing the torque-transmitting members in a direction that they come into engagement with the race surfaces, a cylindrical cage for holding the torque-transmitting members at predetermined angular intervals and controlling their tilting, and a pair of end bearings arranged between the annular members on axially opposite sides of the cage, respectively, and supporting the annular members in a concentric relation. The ribbon spring is arranged between the cage and the inner peripheral race surface.

Abstract: The present invention provides a one-way clutch of sprag type comprising an outer race having an inner peripheral track surface, an inner race disposed within the outer race and having an annular outer peripheral track surface, the outer and inner races being disposed concentrically to be rotated relative to each other, a plurality of sprags disposed between the outer race and the inner race and adapted to transmit torque between the outer peripheral track surface and the inner peripheral track surface, a holder for holding the sprags, and a ribbon spring for biasing the sprags, and wherein the ribbon spring is constituted by side bars disposed at both axial end portions of the ribbon spring and having wrinkle portions, and cross bars extending in an axial direction and adapted to interconnect the side bars and further wherein both circumferential end portions of the ribbon spring are secured to each other.

Abstract: A machining apparatus 10 of an end face of a roller includes a rotatable inner disk 11, a cage 14 having a pocket portion 13 for holding a plurality of rollers 12 at predetermined intervals in a peripheral direction at an outer diameter portion of the inner disk 11 and rotatable independently from the inner disk 11, and a drive belt 15 hung over outer diameter portions of the plurality of rollers 12 held by the inner disk 11 and the cage 14, and by rotating the inner disk 11, the cage 14 and the drive belt 15 in predetermined directions, the roller 12 is revolved while being rotated and the end face of the roller is crowned by an elastic cup grinding wheel 19.

Abstract: A machining apparatus 10 of an end face of a roller includes a rotatable inner disk 11, a cage 14 having a pocket portion 13 for holding a plurality of rollers 12 at predetermined intervals in a peripheral direction at an outer diameter portion of the inner disk 11 and rotatable independently from the inner disk 11, and a drive belt 15 hung over outer diameter portions of the plurality of rollers 12 held by the inner disk 11 and the cage 14, and by rotating the inner disk 11, the cage 14 and the drive belt 15 in predetermined directions, the roller 12 is revolved while being rotated and the end face of the roller is crowned by an elastic cup grinding wheel 19.