| 摘要 |
<p>With regard to the rolling bearing unit for supporting a vehicle wheel, the traveling performance represented by acceleration performance and fuel consumption performance is improved by reducing the rotational torque of a hub rotating together with a wheel. An opening at an inside end of a space where balls 14 are placed is closed by a cap 17a, and another opening at an outside end thereof is sealed by a seal ring 16c having three seal lips. The rotational resistance of the seal ring 16c is limited within a range of 0.03 to 0.2 N.m resulting from the friction between the respective seal lips and the counterpart surfaces. <IMAGE></p> |
