Research On The Low-Wear Radial Bogie For High Speed Passenger Car

Increasing the speed of train is the stratagem of railway development in our country.Four times increasing speed has been done since 1997 on main lines in the large. The highest speed is up to 160km/h.Two times of increasing speed will be done during the tenth five-year' plan also which will increase the speed of train on main line further and on other lines. But the standard of existing railway is low. Furthermore it is not in accord with our country' realistic situation to build the rail lines for high speed largely. So depending on the improvement of the locomotives and rolling stocks performance to meet the need of high speed is what should be done on the basis of existing railway.Following the increasing speed of train,the force between wheel and rail become bigger and the wear is more serious which leads to the shorter period of wheel turning and track replacement raised transport cost and decreased running safety of train. At the same time the serious wear of wheel and rail will reinforce the pollution of surrounding. It is required to search and design a bogie with low wear and good performance to meet the need of transport market.For a long time, the lateral stability and negotiation performance is contradictory for the vehicles with ordinary bogies. The force between wheel and rail will increase and the wear will be more serious when the train is curving at higher speed. Compared to ordinary bogie, the radial bogie can ensure the lateral stability of vehicle. At the same time it can improve the vehicle negotiation performance and reduce the lateral force and wear between wheel and rail. It solves the contradiction between lateral stability and negotiation performance effectively. So the structure of low wear bogie for high speed passenger car searched in this paper is self-steering bogie.The characteristic of several classical self-steering bogies all over the world are compared in this paper. The pull-push rod self-steering mechanism is selected to be the basic structure of the low-wear bogie for high speed passenger car. It' s the first time for this type steering mechanism to be used on the bogie for passenger car in our country . The scheme design and technology design are completed in the paper. The structure parameters are determined. The primary parameters of suspensions and radial mechanism are selected simultaneously.The low-wear bogie for high speed passenger car should have not only the higher critical speed but also better negotiation. So the force and torque of wheel set, bogie frame and car body are analyzed and the dynamic simulation models are established. Then using the multiple bodies simulation program SIMPACK the dynamic performance of the models is simulated and calculated. The primary parameters of suspensions and radial mechanism are optimized. The optimum parameters are picked up which will ensure the low-wear bogie for high speed passenger car better comprehensive performance including lateral stability, ride index and negotiation. Further the dynamic performance of bogie is analyzed and calculated and the performance is compared to that of ordinary bogie. The analysis and calculation results show that the radial bogie might have higher lateral stability and can improve the negotiation meanwhile. It can reduce the vehicle friction power to some extent. When the train runs on the existing railway whose curve radius is smaller the vehicle friction power can be reduced to a larger degree.The frame is the most complex component of the bogie. The intensity of the frame is analyzed using ANSYS program based on the reference of TB/T 1335-1996. According to the calculation result, the structure of frame is optimized so that the intensity requirement would be met and the running security would be ensured when running at high speed.