Retainer segment for a roller bearing for supporting a main shaft of a wind-power generator

A retainer segment provided in a roller bearing, for supporting a main shaft of a wind-power generator, having a pocket to house a roller, and arranged so as to be continuously lined with each other in a circumferential direction, wherein

• said retainer segment is formed of a resin containing a filler material, wherein the thermal linear expansion coefficient of said retainer segment is 1.3×10−5/C.° to 1.7×10−5/C.°, the filler material lowering the thermal linear expansion coefficient for the retainer segment as compared to a retainer segment that is made only of said resin,
• wherein lowering of the thermal linear expansion coefficient of the retainer segment such that the thermal linear expansion coefficient of the retainer segment approximates a thermal linear expansion coefficient of a steel bearing component of the roller bearing and a circumferential spacing between adjacent retainer segments is within a range so that a function of the roller bearing can be prevented from being lowered as a result of pushing between adjacent retainer segments, and
• further wherein the retainer segment is sized for a roller bearing that supports the main shaft of a wind power generator, the roller bearing having a pocket to house a roller, in the roller bearing, a plurality of retainer segments are continuously lined with each other in a circumferential direction of the roller bearing.