抄録
It is important to secure running safety of railway vehicles against wheel-climb derailment accidents. The safety is often discussed according to the value of the derailment coefficient for the leading-outside wheel of a railway bogie running on a sharp curve. Therefore, the detailed mechanism which influences the value of derailment coefficient should be clarified. One of the most dominant factors which greatly affect the value of derailment coefficient is the friction coefficient between wheel and rail. In some sharp curves running, the lubricator is installed on the track to reduce the friction coefficient between the wheels and rails. However, grease withers by repeatedly passing through the railway vehicle. Furthermore, on some sharp curve, the four wheels of the bogie trace each different part of the rails. Therefore, the values of the friction coefficients for wheels are different from each other. In addition, the lubrication between wheel and rail affect the wear of the wheel tread and flange. As the wear progresses, the shape of the tread surface of wheel change, and the motion characteristics also change. In this study, the induced mechanism of derailment coefficient is clarified by using multibody dynamics simulation and the roller-rig test equipment. The influence of wheel wear due to the difference in friction coefficient is also compared.
