Optimization Of Assembly Process Parameters For Tapered Roller Bearings Of Automobile Main Reducer

Assembly is the process that the relevant parts under the action of fixture,according to a certain assembly sequence,are constantly improved in the function and structure and polymerized into an assembly body with certain functional and technical requirements.Assembly is the key link in production and manufacturing,which has a decisive influence on the final performance and life of the product.The assembly process parameter is an important index to realize the assembly,which is related to the degree of tightness between parts,and has an important influence on the quality of the assembly.In order to improve the assembly quality of complex products such as automobiles,the assembly process parameters of the tapered roller bearing of the main reducer are optimized in this paper.Firstly,the structure and function of the main reducer are studied,and the whole assembly process is analyzed.The preload detection index and adjustment method are clarified,and the axial force distribution in the tightening process of the lock nut is analyzed and calculated.Through the above analysis and calculation process,the theoretical basis is provided for the optimization of the assembly process parameters of the tapered roller bearing.Secondly,the parameterized model of the simplified main reducer was established,and the analysis was carried out by ANSYS,and then the forces of each part of the main reducer under different preloading loads are obtained.The data is provided for the calculation of the no-load torque of the tapered roller bearing.Thirdly,according to the relationship between the maximum stress of the tapered roller bearing and the axial preload,the preload force of the bearing with different thickness of the gasket is obtained.The no-load torque of the main reducer is calculated,and the optimization of the preload force of the tapered roller bearing is realized.The result is beneficial to the optimization of the assembly process parameters of the tapered roller bearing through the optimization method of the experimental design.Finally,the experimental factors that affect the friction torque of the tapered roller bearing of the main reducer are randomly sampled by Monte Carlo method,and the range of the factors is reduced according to the results of Adams dynamics analysis.The method of principal component analysis is used to carry out linear transformation to the simulated data,and the dimensionality reduction of the multivariable is realized.Through the orthogonal experiment design method,the assembly process parameters after reducing the dimension are processed.According to the final experimental simulation results,a better parameter combination is selected,which provides a reference for the selection of assembly process parameters of the tapered roller bearing.