Abstract
We introduce about study of low noise gear system technique of Sinkansen. First, we made a simulation model for the purpose of evaluating the dynamic behavior of the Shinkansen gear device. and evaluate influence on vibration by Miss-alignment between a pinion and gear. Second, we describe about FCD material technique. The spheroidal graphite cast iron gear aimed at the decreased of the vibration from the meshing vibration of the gear of the driveline system in the railway vehicle and the noise source. The spheroidal graphite cast iron is excellent in the vibration damping capability and the gear meshing face roughness compared with the steel materials. In the noise testing result of the driveline system gear reduced model that used the spheroidal graphite cast iron, the meshing volume of the gear of 20-25% was reduced. In addition, the gear cutting cost reduction is effective compared with the steel materials. However, rolling fatigue strength and the bending fatigue strength of spheroidal graphite cast iron material is low from the steel materials. It is necessary to improve the fatigue strength of the spheroidal graphite cast iron. And, heat treatment and surface treatment were done to the high strength spheroidal graphite cast iron. This report is a heat treatment of the high strength spheroidal graphite cast iron and introduces of the fatigue strength improvement effect by the surface treatment.
