| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing device for a wheel which improves durability by securing an appropriate preload during straight running and appropriate bearing rigidity during turning and which achieves cost reduction by flexibly responding to each bearing specification. SOLUTION: The bearing device for the wheel includes an angular contact ball bearing comprising double row balls 6. In this device, an inner rolling face 3a of an inner ring 3 is structured with a radius r of curvature, which is formed over a range from the vicinity of a contact point P contacting the balls 6 at an initial contact angleαto a groove bottom and a radius r1 of curvature, which is smaller than the radius r of curvature and formed over a range from an inflection point P1 contacting the balls 6 at the contact angleα1 to large outer diameter 3b of the inner ring 3. The radii r, r1 of curvature are set to the ranges of 1.05d<2r≤1.10d and 1.01d≤2r1≤1.05d with respect to the diameter d of the balls. When the inflection point P1 of the two radii r, r1 of curvature is determined asα1=α+Δαunderα=30 to 45°,Δαis set to the range of 2 to 8°. COPYRIGHT: (C)2010,JPO&INPIT |
