| 摘要 |
<p>A rolling bearing unit for supporting a wheel, wherein both end openings of a space having balls (14) and (14) installed therein are closed by seal rings (16c) and (16d) having two to three seal lips, a rolling resistance varying based on a pre-load is limited to the range of 0.12 to 0.23 N·m, and the total of the rolling resistances of both seal rings (16c) and (16d) based on the friction of the seal lips with their mating surfaces is limited to the range of 0.06 to 0.4 N·m, whereby the traveling performances of a vehicle mainly comprising an acceleration performance and a fuel consumption performance can be increased by reducing the torque of a hub rotating together with the wheel while assuring a steering stability.</p> |
