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 tapered roller bearing comprising:

• an outer ring;
• an inner ring;
• a plurality of tapered rollers having rolling surfaces abutting said outer ring and said inner ring;
• and
• a plurality of retainer segments each having pockets formed by a plurality of column parts extending in an axial direction and connection parts extending in a circumference direction to couple said plurality of column parts to house said tapered 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
• a relation D>d is satisfied in at least one position of the rolling surface of each tapered roller,
• where D is a roller diameter of the tapered roller at a certain position of the rolling surface is D, and d is a distance between the track surfaces of the inner ring and the outer ring at the measurement position of the roller diameter of the tapered roller.

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 tapered roller bearing assembled in a fix member to support said main shaft rotatably, wherein,
• said tapered roller bearing includes an outer ring, an inner ring and, a plurality of tapered rollers having rolling surfaces abutting said outer ring and said inner ring and a plurality of retainer segments each having pockets formed by a plurality of column parts extending in an axial direction and connection parts extending in a circumference direction to couple said plurality of column parts to house said tapered 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
• a relation D>d is satisfied in at least one position of the rolling surface of each tapered roller,
• wherein D is a roller diameter of the tapered roller at a certain position of the rolling surface is D, and d is a distance between the track surfaces of the inner ring and the outer ring at the measurement position of the roller diameter of the tapered roller.