| 摘要 |
In a 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 are placed is closed by a cap, and another opening at an outside end thereof is sealed by a seal ring having three seal lips. The rotational resistance of the seal ring 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.
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