Patent ID: 7837393
Filing Date: 2010-11-23
Classification: F16C

Abstract:
1. A self-aligning roller bearing comprising: an inner ring having a double-row raceway; an outer ring having a double-row integral and spherical raceway; a plurality of rollers incorporated between the inner ring raceway and the outer ring raceway on a double-row basis; and a retainer for rotatably retaining the rollers, wherein: processing marks crossing each other are formed on a raceway surface of the spherical raceway of the outer ring; the processing marks are substantially straightly cut at a predetermined crossing angle to the circumferential direction of the raceway surface, the surface roughness of the raceway surface of the outer ring is in the range from 0.15 to 0.4 μmRa in terms of average roughness at the centerline thereof in both of the radial direction and the circumferential direction at least at portions in contact with the rollers, a difference in surface roughness between measurements in the axial direction and the circumferential direction is 0.1 μmRa or less, skewness (Rsk) is −0.4 or less, and the roughness of a raceway surface of the inner ring is 0.1 μmRa or less in terms of average roughness at the centerline in the axial direction thereof.