Patent ID: 8764304

Claim:
A roller bearing comprising: an outer ring; an inner ring; a plurality of rollers arranged between said outer ring and said inner ring; and at least three retainer segments, each having a plurality of pockets to house rollers, and arranged so as to be continuously lined with each other in a circumferential direction between said outer ring and said inner ring, wherein each said retainer segment is formed of a resin containing a filler material to lower a thermal linear expansion coefficient, a clearance is provided between the first retainer segment and the last retainer segment after said plurality of retainer segments have been arranged in the circumferential direction without providing any clearance, and a circumferential range of said clearance is larger than 0.075% of a circumference of a circle passing through a center of said retainer segment and smaller than 0.12% thereof, at room temperature, wherein a thermal linear expansion coefficient of said resin is 1.3×10 −5 /C.° to 1.7×10 −5 /C.° and the roller bearing is used for supporting a main shaft of a wind-power generator.