Design And Performance Simulation Of Vehicle Braking System Of Haulage Vehicle Underground

In order to solve the problem of underground rail traction locomotive in coal mine, such as reacting slow, long free distance, poor braking ability and etc., this paper presents a braking scheme which use spatial cam linkage mechanism combined with drum brake. Through establishing the virtual prototype, carry on dynamic simulation of braking system; meanwhile, using finite element analysis method to analyze the contact of drum brake.Based on the analysis of the existing wheel type mechanical braking structure, combining the advantages of spatial cam mechanism, such as efficient, lightweight, design contour curve of cam reasonably; arrange the linkage position correctly, get cam linkage mechanism which can transfer the braking force. Then use the leading and trailing shoe brake as brake execution mechanism, braking the vehicle.Modeling of the brake system using virtual prototype technology to obtain the kinetic parameters of braking system such as contact force, braking torque and etc., and gain parameters which can reflect performance of braking such as braking time, braking distance by using ADAMS software. Verify the correctness of the simulation process by comparing practical simulation results and theoretical analysis results. The error between them is within 8% and the parameters as braking distance, braking time are all accordance with provisions of the articles of the "coal mine safety", which prove the simulation analysis to be correct and feasible.Conduct contact analysis of drum brake by means of finite element analysis software ANSYS/Workbench. By using the method of pre-loaded, obtain braking efficiency factor, then analyzes the stress and the contact stress distribution of components of drum brake under the actual force. Stress distribution of brake components characterize its structure meet the strength requirements; the distribution of contact pressure is consistent with the existing cosine distribution theory, which verified the correctness of the contact analysis. Optimize the design of brake structure parameter- initial friction angle to fix the error. The result after optimizing is more close to the theoretical value, verifying the feasibility, correctness of the optimization, providing a basis for the design and optimization of the brake.