ABSTRACT

The EEF bogie proposed by Frederich shows good curving performance making use of the gravity restoring force generated by the tread gradient of independently rotating wheels. However, the bogie gives rise to a kind of hunting motion as the vehicle running speed increases. In this paper, an effective modification of the EEF bogie which solves the hunting motion is mentioned. The solution is to incline both wheel axles while adjusting the tread gradient of each wheel. In this paper, the EEF bogie with inclined wheel axles is firstly proposed and analytically evaluated by MBD simulation. From the result of linear stability analysis, proposed bogie can dramatically improve the hunting stability. In addition, the proposed bogie has excellent curving performance in tight curve section equivalent to the conventional EEF bogie. As those results, it is possible to achieve both high speed stability and curving performance.