Research On Structure Optimization Design And Braking Performance Of Wedge Brake For Commercial Vehicles

With the rapid development of China's economy and the rapid construction of highway networks,the demand for commercial vehicles is increasing in all walks of life.Commercial vehicles have become an indispensable means of transportation in people's lives,with the increasing frequency of transportation of commercial,their huge body and loading has brought more safety hazards for drivers and other traffic participants.The braking system of the car has an inseparable relationship with the safety of the car.To reduce the frequency of traffic accidents,it is imperative to design and optimize a brake with high braking efficiency,stable braking performance and high reliability.Current commercial vehicle brakes are mainly drum brakes,and there are many problems in it,such as cumbersome processing of key components,heavy component quality,and large space occupied by the mechanism.In response to these problems,the design and research of the drum brakes installed in commercial vehicles,through the design and optimization of the main components,to achieve the purpose of improving the braking performance of the brake,reducing the weight of the brake and reducing the volume of the brake.This paper analyzes and studies the working principle and structure type of the brake first,comprehensively considers the advantages and disadvantages of various structures,and determines the most suitable structural design plan.Through the analysis of the braking force,the main structural parameters of the brake are designed and calculated;secondly,the expansion mechanism and the brake shoe are studied,the traditional cam expansion mechanism is replaced by the wedge-type expansion mechanism,and the stamped welding brake shoe is used It replaces the traditional cast brake shoe,optimizes the overall structure based on the multi-objective particle swarm algorithm,reduces the volume of the brake,and performs three-dimensional modeling and virtual assembly.The key components were analyzed by the static finite element analysis method,and the rationality of the design was verified,and the key components were further optimized based on the analysis results.Finally,the braking performance of the brake is analyzed and verified.The natural frequencies of key components are studied through modal analysis,the effect of friction temperature rise on the stress field is studied by the thermal-structure coupling analysis method,and the brake prototype is tested.The results It shows that the designed brake structure is reliable and superior to the cam brake of the same specification in terms of braking performance.