Simulation research on brake and release performances for the TMB60 brake equipment

Abstract

The foundation brake rigging plays an important ole in wagon brake system, which is responsible for low-down and parking. TMB60 is a beam unit brake quipment combined brake shoes stack adjuster with cylinder. Compared with the multi-lever structure of traditional layout form, TMB60 has an advantage of higher transmission efficiency and smaller space occupying, and so on. This paper mainly focuses on knowing how the braking and releasing performances of TMB60 and the influence of wheel wear on the braking and releasing process. With the multi-body dynamics simulation method, the pressure uniformity of brake shoes and the difference of release resistance and mechanism movement are researched. Firstly, the structural components, the performance parameter and the working principle of the unit brake equipment are analyzed. The modeling and simulation analysis method of mechanisms with clearance in RecurDyn software are explored and a multi-rigid body dynamics model of the TMB60 is established. And then, the simulation experiments in four kinds of working conditions are conducted, including air brake, spring aided release, non-spring aided release and 10 times consecutive brakes. The pressure distribution of the brake shoes, the release sequence, the release resistance, the release displacement, and the lateral shift of brake beams are discussed. The results indicate that in braking process, the pressure of shoes is distributed evenly and the difference of every axle and every side is less than 3%. In releasing process, the release resistance of non-cylinder beam is larger than the other, and the release displacement of both beams are negatively correlated. After multiple brakes, the two beams shift laterally along the opposite direction. The simulation results are well consistent with data from the worksite. The research accomplishments above provide technical support for further application of the unit brake equipment in China railway wagon.