Study On Working Performance Of Floating Shoe Brake

Nearly a century after the birth of the drum brakes,it occupies a large market with its simple working principle,low cost,and high braking performance,especially in medium and large passenger cars and trucks.Drum brakes have a variety of structural forms,but the problem of non-uniform friction plate contact remains to be solved.How to improve the performance of the brake without changing the volume of the drum brake is of great significance.This paper starts from the structure of the supporting pin of the drum brake.By changing the support pin assembly with floating function,the brake shoe has a floating function and changes the brake shoe's movement tendency,so as to achieve the purpose of improving the performance of the brake.First of all,this paper theoretically analyzes the influence of the main dimensions of the drum brake on the contact of the brake.Through the use of Matlab simulation analysis,it is confirmed that the fluctuation of the brake shoe has a direct impact on the friction plate contact,and draws a different float In the direction,the different floating distance and the change law of the contact area between the friction plates.Then,considering the elastic linear deformation of the friction plate,the force conditions and complete contact conditions of the brake friction plate are deduced,and the theoretical optimal floating angle of the brake shoe when the friction plate is completely fitted to the brake drum is calculated..Subsequently,a radial floating brake model was established in the finite element analysis software ANSYS Workbench.The dynamic performance was simulated and analyzed.The analysis results were consistent with the experimental data,indicating that the finite element analysis can accurately describe the brake braking process.Selecting different floating angles for optimization analysis to optimize the contact of the friction plates is the main optimization goal.Ultimately,under the deduced theoretical optimal floating angle,the friction plate is best fitted to the brake drum,and the braking torque is obtained.Promote.If the float angle is too large or too small,the contact condition of the friction plate will deteriorate,making the braking effect unstable and unable to meet the requirements of use.Finally,the degree of brake deviation of the two types of brakes is compared.In the direction of eccentricity of the different brake drums,performance simulations were performed on the normal brake and the brake with the best floating direction of the leading hooves,respectively.The results show that the braking performance of ordinary brakes varies greatly in different eccentric directions,and the braking performance of the floating brakes is stable in different eccentric directions.The results of the integrated finite element analysis show that the theoretical optimal floating angle obtained from the calculation of the brake shoe force in this paper is reasonable,the contact condition of the floating brake can be significantly improved,and the performance of the braking process is also better than that of ordinary drums.The brake is also improved when the assembly error exists for a certain degree.