Patent ID: 7435007
Filing Date: 2008-10-14
Classification: F16C

Abstract:
1. A self-aligning roller bearing in which double row rollers as rolling elements are arranged rollably between an inner ring and an outer ring in a circumferential direction, wherein a roughness of an outer ring raceway surface formed on an inner peripheral surface of the outer ring is made larger than a roughness of an inner ring raceway surface formed on an outer peripheral surface of the inner ring, and an average roughness Ra of the outer ring raceway surface is set within 0.1 μm≦Ra≦0.5 μm in an axial direction and a circumferential direction, and a roughness parameter S that is defined by where n is a number of peaks of the roughness of a roughness curve indicating the roughness of the outer ring raceway surface, and Si is an interval between neighboring peaks of the roughness curve is set within 0<S≦20 μm.