Abstract
As the key subsystem of the locomotive, the braking performance of the brake system has a crucial impact on the safety of the vehicle, as the most critical connecting component in the braking system, the connecting bolts have a direct impact on the braking performance of the braking system. Therefore, the strength of the bolt must be checked and analyzed before the braking system is installed. Aiming at the braking system of a freight train, this paper adopts the method of combining theory with finite element numerical analysis to check and analyze the strength of the bolts during the braking process. Firstly, the bolt is subjected to force analysis and the reasonable preload range of the bolt and the critical friction coefficient between the friction plate and the brake caliper are deduced theoretically. Then by using finite element numerical analysis method, the influence of preload on the bolt and friction coefficient between friction plate and brake caliper on force loaded bolts during braking is analyzed by simulating the actual braking process. The results show that the bolt pretension is uneven and the friction coefficient between the friction plate and the brake caliper has a great influence on the bolt strength.
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