| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress breakage of an M-type retainer for a needle roller bearing, even if the retainer is elliptically deformed or a twisting force is applied to the retainer. <P>SOLUTION: A roller bearing 19 containing a retainer 11 is made of a cylinder equipped with a plurality of pockets 13 which house a needle roller 20 in circumferential direction with a pillar part 12 in between. The cylinder has an M-shaped cross section which includes a flange part 15 bent toward the inner diameter side at both ends of an outer diameter cylinder part 14, and a recessed part that recesses in a V-shape toward the inner diameter side at the central position in axial direction. The recessed part includes an inclination part which recesses to the inner diameter side, and a bottom part that is provided at the end part on the inner diameter side of the inclination part, being parallel to the outer diameter cylinder part 14. The wall of the bottom part is formed to be thicker than that of the outer diameter cylinder part 14. <P>COPYRIGHT: (C)2012,JPO&INPIT |
