| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a bearing unit for a wheel applying a proper preload while suppressing costs. <P>SOLUTION: Finishing of an outer circumferential face of a hub 8 composing the bearing unit for the wheel is carried out by a rotary grinding wheel 35 rotating in a state with a outer circumferential face form adjusted by a forming rotary dresser 36. Finishing of a plurality of rows of outer ring raceways provided in an inner circumferential face of an outer ring, and finishing of an inner ring raceway formed on an outer circumferential face of an inner ring externally fit and fixed on a small diameter step part 15 of the hub 8 are also carried out by a similar rotary grinding wheel. The preload applied to each rolling element can be appropriated in a state combining the hub 8, the outer ring, and the inner ring by precisely regulating form accuracy and size accuracy of a portion influencing the preload. <P>COPYRIGHT: (C)2004,JPO |
