| 摘要 |
An outer ring raceway surface (14) formed on the inner peripheral surface of an outer ring (13) has roughness higher than that of inner ring raceways (12a, 12b) of an inner ring (11). Average roughness (Ra) in the axial direction and circumferential direction of the outer ring raceway surface (14) is 0.1 mum <= Ra <= 0.5 mum in the ranges of b1/(B/2) <= 0.9 and b2(B/2) <= 0.9 and in the measurement length of 0.1 mm to 1.0 mm, with B the width of the outer ring (13), b1 and b 2 the distances in the axial direction from both end surfaces of the outer ring (13). Roughness parameter (S) of the outer raceway surface is 0 < S <= 20 mum.
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