Study On Transmission Parameter Optimization Design And Gear Modification Of Hub Drive Reducer

With the rapid development of China's economy and the increasing exploitation of resources,the demand for large and heavy-duty mining dump trucks in China is increasing.The high torque hub drive system is an important core component of mining dump trucks.Its quality seriously affects the performance of vehicle transmission system and restricts the upgrading of the whole vehicle.Compared with foreign countries,the integrated design optimization and gear modification vibration reduction methods of high torque hub drive in China are insufficient.It is difficult to design and optimize the best transmission parameters of hub drive system and obtain the best practice of gear modification,and it is difficult to meet the requirements of long service life and high reliability of hub drive system,As a result,China's construction machinery hub drive core components mainly rely on foreign imports,which restricts the upgrading and development of the whole project dump truck.Firstly,this thesis takes the design of a dump truck hub drive system with a load of more than 360 tons as the research goal,determines the transmission structure,installation layout and boundary conditions of the hub reducer according to the parameters of the motor,vehicle parameters and vehicle performance requirements,selects a relatively accurate calculation formula to calculate the relevant parameters of the gear system,and establishes the tooth width,transmission ratio The number of planetary gears,the number of teeth and the modification coefficient are taken as the optimization variables,the minimum volume of the reducer and the equal life of the gear are taken as the optimization objectives,and the gear interference,tooth surface hardness,tooth root bending strength,tooth surface gluing and shaft radial size are taken as the constraints.Secondly,the Sparrow Search Algorithm(SSA)is improved by introducing the idea of particle symbiosis mechanism,Levy flight mechanism and uniform guidance of current population particles.The Improved Sparrow Search Algorithm(ISSA)is compared with particle Swarm Optimization Algorithm(PSO),Gray Wolf Algorithm(GWO),Whale Algorithm(WOA)and Sparrow Search Algorithm(SSA)under the same equipment environment and benchmark function by comparison,the results show that the solution accuracy and robustness of ISSA algorithm are better than the other four algorithms.ISSA algorithm is used to solve the optimization model of hub drive reducer.The optimization results are analyzed in Masta software.The results show that the output torque of the reducer meets the expected high torque requirements.The topology optimization of planetary carriers at all levels is based on ANSYS software The static and modal analysis of the two-stage planetary carrier is carried out to analyze the maximum deformation and maximum strain of the optimized two-stage planetary carrier,and judge whether the planetary carrier has resonance after structural change.Then,the time-varying meshing stiffness,tooth side clearance,static transmission error and friction torque of internal and external meshing pairs of planetary gear train are analyzed and calculated respectively.Combined with the coordinated deformation conditions of planetary gears,the planetary gear dynamic model with the influence of tooth surface friction factors is constructed,and then the dynamic differential equation is solved and calculated by Runge Kutta method,Thus,the maximum fluctuation of dynamic transmission error of internal and external gear pairs at all levels is analyzed and obtained under the influence of friction factors.At the same time,the contact spots of the gear pair are analyzed,the correct modification scheme is selected through the contact analysis,and the dynamic transmission error calculation model considering the modification parameters is constructed to form a dynamic modification optimization model with the minimum sum of the maximum dynamic transmission error fluctuation of the internal and external meshing pairs of each stage as the optimization objective and the modification of the internal and external meshing pairs of each stage as the optimization variable,Then the modification optimization model is solved by ISSA algorithm,so as to obtain the optimal modification amount of gear modification.Based on Masta software,the transmission error fluctuation,contact load distribution and maximum flash temperature of each gear pair of hub drive reducer before and after modification are discussed to verify the correctness of this dynamic modification method.Finally,based on the theoretical analysis of the whole thesis,the guide module in Matlab software is used to develop the optimization design and gear modification system of Engineering hub planetary reducer,and the relevant system pages such as user authentication login,initial operation,material setting,original parameter input,variable parameter setting,optimization results,dynamic parameter excitation analysis,gear modification and modification results are established,Taking the hub drive reducer in this thesis as an example,the parameter data of the hub drive reducer in this thesis are input and compared with the above theoretical analysis results to verify the correctness of the development system.