| 摘要 |
PROBLEM TO BE SOLVED: To obtain a structure in which rotational resistance is stably restrained low by reducing all differential slips between a rolling surface of a roller and a raceway surface, friction between an axial end face of the roller and internal surface of a pocket of a retainer and friction acting between the retainer and a counterpart surface without making an attitude of each roller unstable. SOLUTION: Convex portions 14 are formed on raceway surfaces 4A of the rollers 1b, 1b. Positioning with respect to axial direction of the retainer 3a is obtained by a roller guide structure. The internal surface of the retainer 3a is abutted on flat surfaces 11, 11 with central portions of axial end faces of the rollers 1b, 1b as the flat surfaces 11, 11. The rotational resistance is significantly reduced by a synergy effect. COPYRIGHT: (C)2012,JPO&INPIT |
