| With the steady development of my country’s economy and the continuous improvement of people’s living standards,it has promoted the continuous development and growth of my country’s civil automobile market.Among them,as an important means of land transportation,automobiles are more closely related to people’s production and life,and their safety issues cannot be ignored.As an important part of the automobile assembly,the automobile braking system is the key to ensure the safe driving of the automobile.At the same time,as the core part of the car braking system,the performance of the brake directly affects the safe operation of the car braking system and even the whole car.In this paper,a rigid-flexible hybrid model of the wedge brake is constructed by computer-aided engineering(CAE)software,and a virtual prototype of the wedge brake opening mechanism is established.The research on the overall performance of wedge brakes provides theoretical guidance and practical methods.The main research work in this paper is as follows:(1)The mechanical analysis of the brake air chamber and the wedge-type opening mechanism,the structural design of the wedge-type brake,the design and calculation of the key parameters of the brake,and the three-dimensional modeling of the main components of the brake are carried out.At the same time,in order to ensure the accuracy and speed of subsequent simulation analysis,the components are structurally simplified,and the connectors are compressed..(2)Establishing a rigid-flexible hybrid simulation model of the wedge brake.First,a multi-rigid body system is directly established on the basis of the 3D model.After defining the material properties and boundary conditions,a preliminary multi-rigid body system dynamic analysis is carried out,and the model is verified at the same time.Then,the flexible body processing is performed on the components considering elastic deformation,and the rigid-flexible hybrid simulation model of the wedge brake is obtained after rigid-flexible replacement.(3)A virtual prototype of the wedge-type brake opening mechanism was established,and the dynamic simulation of the model was carried out,and the contact force,thrust ratio,braking time and braking strength of the brake opening mechanism on the left and right brake shoe assemblies were obtained.By comparing the relevant national standards for brake testing,it shows that the performance of the brake opening mechanism meets the requirements.(4)The fatigue life analysis and bench fatigue test of the wedge-type opening mechanism were carried out,and the relevant fatigue coefficients affecting the fatigue life were obtained by consulting the literature and reference books,and the S-N curve of the part was obtained.Based on the static analysis of the wedge-type opening mechanism,the fatigue life simulation analysis is carried out.According to the fatigue life,safety factor and other fatigue parameters obtained from the simulation,it is verified that the fatigue life of the wedge-type opening structure meets the requirements.At the same time,several sets of bench fatigue tests are carried out on the samples of the wedge-type brake opening mechanism.The test results show the reliability of the wedge-type opening mechanism and the availability of the automatic clearance adjustment mechanism. |
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