Parametric Modeling And Lightweight Analysis Of Automobile Differentials

The differential is one of the very vital sections in the drive axle of a automobile.When the car is turning or driving on uneven roads,it can make the left and right drive wheels roll at different angular speeds to ensure that the drive wheels on both sides and the ground Do pure rolling exercises.The research content of this paper are as follows:According to the basic specifications of a differential pair of car models,based on differential design principle,the basic design parameters of the calculation of the differential gear,such as the number of teeth,pressure angle,modulus,etc.,and then use the differential gear Housing and other parts are designed.After the design is completed,the differential is modeled according to the design parameters.The model uses the 3D software SolidWorks and its plug-in Maidi toolset to form the basic tooth profile with Maidi.Based on this,the differential model is completed.Compared with the parametric modeling,it will have the high design efficiency,simplify the design process,and quickly correct the deficiencies in the design.Based on the three-dimensional model and the finite element method,Perform contact analysis on the planetary gear and side gear in the differential,set the contact pair and apply the load,solve the force situation of the gear,and obtain the force cloud diagram of the gear.Finally,it is concluded that the stress value of the gear at the tooth root is the largest,followed by the subsurface stress at the meshing position of the two gear teeth,which is also an important reason for the tooth root breakage and gear pitting.The analysis results and the actual use of the gear The common failure forms match.The finite element analysis of the differential gear shaft was carried out to obtain the gear shaft stress cloud diagram and the first six-order vibration mode diagram,which was prepared for further dynamic analysis.Secondly,propose a light weight of the differential case.According to the commonly used lightweighting approach,the aluminum alloy ADC12 was tried to replace the traditional ductile iron.For the two conditions of wheel slipping on one side and rolling Far East on both sides,static analysis and free modal analysis are performed on the differential case of these two materials,and the judgment is made by comparing the analysis data of the two materials.The feasibility of this lightweight approach.The static analysis results show that no matter which material is used,the maximum stress value of the casing is less than the yieldstrength of the material,which meets the requirements of the use of the differential;modal analysis results show that the inherent frequency of aluminum alloy is higher than that of ductile iron,but from the frequency itself,it will not affect the NHV performance of the car.Based on physical experiments,we can try to replace the original nodular cast iron with aluminum alloy to reduce the weight of the car.