Roller bearing, retainer segment of roller bearing for supporting main shaft of wind-power generator, and main shaft support structure of wind-power generator

A main shaft support structure of a wind-power generator, comprising:

• a blade receiving wind power;
• a main shaft having one end fixed to said blade and rotating together with said blade;
• and
• a roller bearing assembled in a fix member to support said main shaft rotatably, wherein
• said roller bearing has 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,
• 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.°.