Double row self-aligning roller bearing 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 with the blade;
• and
• a double row self-aligning roller bearing incorporated in a fixing member and supporting said main shaft rotatably,
• said double row self-aligning roller bearing comprising an inner ring, an outer ring, and spherical rollers in double rows, characterized in that
• the curvature radius of the ridge line of the spherical roller in the row positioned farther from the blade is R1, the curvature radius of the ridge line of the spherical roller in the row positioned closer to the blade is R2, the curvature radius of the inner ring track surface in the row positioned farther from the blade is N1, and the curvature radius of the inner ring track surface in the row positioned closer to the blade is N2, a relation such that
• N1/R1>N2/R2
• is satisfied.

A double row self-aligning roller bearing in which spherical rollers are arranged in double rows between an inner ring and an outer ring, characterized in that

• said inner ring has a center rib abutting on the end surfaces of said spherical rollers in double rows,
• the end surface of each spherical roller abutting on said center rib has a convex spherical configuration, and
• said center rib has at least a flat side surface of both side surfaces abutting on the end surfaces of said spherical rollers in double rows, characterized in that
• one side surface of said center rib is a concave curved surface matched to the convex spherical configuration of said spherical roller, and the other side surface thereof is a flat surface.