風車用増速機の信頼性向上に関する研究（第１報，ローターモーメントによる軸受損傷メカニズム）

概要

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In this paper, it is clarified that the early damage of a spherical roller bearing used in the planetary gear of the gear box for wind turbine is caused by the rotor moment which wind force generates. We remarked to the outer ring of the damaged bearing having slipped out, in spite of shrink fitting. Therefore it was hypothesized that the outer ring started slipping out by the rotor moment, and the bearing is damaged early by uneven distribution of the load to act on roller. The drive train analysis by using multi-body dynamics, the field testing and the scaled laboratory testing were carried out to verify the hypothesis. As a result, it was clarified that 1% - 1.8% of the rotor moment were transmitted to the planetary gear in the conventional drive train of the wind turbine, the rotor moment is increased by wake, and the moment which wake generates lets an outer ring start slipping out. As a solution, it was shown to be effective to change a spherical roller bearing to a cylinder roller bearing, and disconnect the transmitted moment from rotor to gearbox by gear coupling.
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