Patent ID: 6789949
Filing Date: 2004-09-14
Classification: F16C

Abstract:
A roller bearing, comprising:an inner ring member; an outer ring member arranged concentrically with said inner ring member and around said inner ring member; and a plurality of rollers arranged between said inner ring member and said outer ring member, at least one of said inner ring member and said outer ring member having an end portion in an axial direction including a flange having a guide surface arranged to guide end faces of said rollers, and said end faces of said rollers including microscopic streaked grinding trails arranged in multiple directions including two or more different directions each of which is different from a circumferential direction, the microscopic streaked grinding trails on said end faces of said rollers being arranged in multiple directions under a condition satisfying the following formula (1); &ggr;=L2/L1&lE;2.5â€ƒâ€ƒ(1) in which &ggr; surface pattern parameter of the roller end face, L1: a correlation length of roughness in a radial direction on said end faces of said rollers, and L2: a correlation length of roughness in a circumferential direction on said end faces of said rollers, wherein the correlation length corresponds to a length until an auto-correlation coefficient becomes 0.5.