| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent the damage of a crack and the like from occurring at a rolling surface of each of balls 7, 7 when assembled between an inner periphery surface of a bearing hole 22a of a fixed bearing 21a and the outer periphery surface of a pinion axis 3a, and to obtain a structure in which excessive vibration or noise is not generated during driving, and excellent durability can also be secured. <P>SOLUTION: The whole portion among the inner periphery surface of an outer ring 5b ranging from an outer ring track 11 small in an inner diameter to a continuing part with an end face 23 at a side of the outer ring 5b large in the inner diameter, and the whole portion among the outer periphery surface of an inner ring 6b ranging from an inner ring track 12 large in the outer diameter to the continuing part with the end face 24 in the side small in outer diameter of the inner ring 6b have no corners unable to be differentiated with respect to a cross-section shape and to be a polishing processed smooth surface. <P>COPYRIGHT: (C)2013,JPO&INPIT |
