| 摘要 |
<p>An object of the present invention is to provide a bearing apparatus for a wheel of vehicle which can solve the antinomic problems of reducing the weight and size of the bearing apparatus and of increasing the rigidity of the bearing apparatus, and also can improve the noise characteristics and the life of the bearing apparatus by preventing generation of damages on balls during assembly of them. According to the present invention there is provided a bearing apparatus for a wheel of vehicle characterized in that a pitch circle diameter of a ball group of the outer side is larger than a pitch circle diameter of a ball group of the inner side, and that each of corner portions of the outer circumferential surfaces of the inner member is rounded as a smooth circular arc.</p> |
