| 摘要 |
<p>A rolling bearing unit for supporting a wheel, wherein openings at both ends of a space having balls (14, 14) installed therein are closed by seal rings (16c, 16d) each of which having two to three seal lips, a rolling resistance varying according to a pre-load is restricted in the range of 0.15 to 0.45 N.m, and the total of the rotating resistances of the seal rings (16c, 16d) based on a friction between the seal lips and their mating surface is restricted in the range of 0.06 to 0.4 N.m.</p> |
