Wet Clutch Design And Modeling Simulation Based On HMCVT

Hydro-mechanical Continuously Variable Transmission has smooth hydraulic transmission and high mechanical transmission efficiency.Compared with the traditional transmission,the segmentation is smoother.In recent years,HMCVT has become more and more popular in new non-road vehicles developed in Europe and the United States.With its unique advantages,HMCVT has gradually become the preferred transmission scheme for high-power tractor gearbox design,with huge market application prospects.In this thesis,the planetary platoon and its brake control device-wet clutch,combined with the actual working condition parameters of the high-powered tractor P7000,complete the design calculation and modeling simulation of the relevant parts.The specific research contents and conclusions are as follows:1.According to the actual working conditions of the planetary gear mechanism,a planetary row mechanism capable of realizing HMCVT high/low speed switching is designed.On this basis,the design of the wet clutch connected to the ring gear is completed,including the selection of the reserve coefficient,the friction plate design,the piston design,the return spring design,the spline and seal selection,and the housing design.2.Aiming at the special structure of the planetary gear ring and the clutch active hub and the need to transmit torque,ANSYS was used to analyze the static force of the active hub and the sun gear.And by comparing the simulation results of different oil drain hole structures,finally,under the premise that the strength meets the requirements,the structure of processing the long oil hole on the clutch spline groove structure is determined to realize the function of cooling and lubricating the friction plate and achieve the lightweight design of the clutch.Further verified by modal analysis that the maximum strain is in accordance with the strength requirements.3.The planetary assembly and wet clutch were modeled in three dimensions by SolidWorks modeling software,and the virtual assembly of its key components was completed.The rationality of the structure was verified by interference analysis.The dynamic model of the clutch is established,and the oil-filling stage,piston pushing stage and friction plate joining stage are simulated and analyzed.4.Using AMESim to simulate the v-α-f commutation law and the traditional synchronous commutation law respectively,the simulation results show that compared with the application of the traditional synchronous commutation law,the application of v-α-f commutation law can be more effectively reduce the impact of the segment and improve the stability of the transmission system.The hydraulic characteristics of the wet clutch during the commutation process were simulated and the effectiveness of the simulation results was verified by bench test.