| 摘要 |
A rolling bearing unit (H) for a wheel includes an outer ring member (1) having a flange portion (10) formed on its outer periphery and fitted to a vehicle body-side member, an inner ring member (2) rotatably fitted in the outer ring member (1), and double-row rolling elements (3) arranged between the outer ring member (1) and the inner ring member (2). The flange portion (10) includes a first flange portion (10a) formed on the upper-side portion of the outer periphery, and a second flange portion (10b) and a third flange portion (10c) formed on the lower-side portion of the outer periphery. Each of the first, second and third flange portion (10a, 10b, 10c) has a bolt-hole used to fit the outer ring member (1) to the vehicle body-side member. The first flange portion (10a) is formed in such a manner that the bolt-hole thereof is positioned on the vertical line that passes through the rotational center (C) of the outer ring member (1). |
