| 摘要 |
PROBLEM TO BE SOLVED: To implement a bearing unit for a driving wheel capable of reliably applying preload and of maintaining over an extended period the state in which no grating noise is made during operation. SOLUTION: A preload is applied to respective rolling elements 6 and 6 by retaining an inner ring 5 by a caulking portion 30. A bearing unit 1a for supporting a driving wheel and an equal velocity joint 2 are coupled by fastening a nut 24a. Regulating the fastening force of the nut 24a leads to 1.5×108 Pa or lower of a surface pressure in an abutting portion of a flat surface 32 formed in the caulking portion 30 and the outer edge surface of the outer ring 14 for the equal velocity joint.
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