Research On Radial Isothermal Rise Technology Of Friction Element Of Wet Clutch

The rising cost of manpower and material resources and the increasingly harsh working environment put forward the requirements of stable service life,high operation reliability and good economy for the machinery industry.Because of its special position in the control power transmission system terminal,researchers have developed a variety of clutches suitable for different working environments.Wet clutches are used in heavy-duty tractors because of their stable working performance and good thermal effect.In this paper,aiming at the characteristics of uneven radial temperature distribution of friction element of wet clutch and easy thermal warpage deformation,this paper applies heat transfer theory,thermoelastic deformation theory,mathematical model of temperature field of friction element and mathematical model of cooling flow field to study the thermal warpage deformation mechanism of clutch,and uses simulation software to study the temperature distribution and deformation of dual steel sheets under the radial gradient of various groove parameters and friction material of friction plates.The specific research contents are as follows:The size of the friction element suitable for the actual working condition of the clutch is calculated and the friction element suitable for the heavy tractor is designed.The friction effect of the clutch under dry working condition was analyzed,and the thermal and mechanical coupling simulation of the friction element of the clutch in dry working condition was carried out by ABAQUS simulation software,and the energy formula was verified for the simulation results.The thermal-fluid-structure coupling process of the friction element of the wet clutch is analyzed.STAR CCM+ was selected to simulate the flow field in the groove of the friction element,and ABAQUS and STAR CCM+ were used to conduct the thermal-fluid-structure coupling simulation study,and the simulation results of thermal-fluid-structure coupling and thermal-mechanical coupling were compared,and the thermal-fluid-structure coupling simulation analysis of the groove number under multiple working conditions was carried out,and the temperature distribution and deformation of the friction element were comprehensively considered.Based on the simulation results of the number of grooves,in order to solve the problem of uneven circumferential temperature distribution caused by stress concentration at the edge of the groove,the inclination angle of the grooves was simulated and analyzed under multiple working conditions.On the basis of the selected number of grooves and slot angle,in order to make the temperature distribution of friction elements more uniform,based on three common friction materials,a variety of radial material gradient schemes of friction plates were designed,and the scheme was simulated and analyzed.The material gradient scheme was selected by comprehensively considering the characteristics of friction materials,temperature distribution and deformation of friction elements and economic benefits.