Rolling bearing and wind power generation rotor shaft support device

Abstract

To provide a rolling bearing having a hard film on an inner ring raceway surface and an outer ring raceway surface of the rolling bearing that improves peeling resistance of the hard film, shows the original property of the hard film, and suppresses the attackability to a mating material. A rolling bearinghas an inner ringhaving an inner ring raceway surfaceon an outer circumference, an outer ringhaving an outer ring raceway surfaceon an inner circumference, and rolling elementsthat roll between the inner ring raceway surfaceand the outer ring raceway surface. A hard filmincludes a foundation layer formed directly on the inner ring raceway surface 2or the outer ring raceway surfaceand mainly formed of Cr and WC, a mixed layer having a gradient composition formed on the foundation layer and mainly formed of WC and DLC, and a surface layer formed on the mixed layer and mainly formed of DLC. In a roughness curve of a surface on which the foundation layer is formed, the arithmetical mean roughness Ra is 0.3 μm or less and the root mean square gradient RΔq is 0.05 or less.