Finite Element Analysis And Optimization Design Of A Commercial Vehicle Transmission Housing

As an important part of vehicle transmission system,transmission housing is the foundation of transmission system.Reasonable structure design of transmission housing can not only assure transmission accuracy and reduce shock and vibration during gear transmission,but also improve the stiffness and strength and prolong its service life in the premise of reducing weight through the optimization of material distribution.In this paper,studies are conducted on structural modal,static strength and fatigue life of a certain type of transmission housing by numerical method.The main work is as follows.Firstly,the design theory of transmission housing and finite element method were studied.Based on those points,the 3D model and finite element model of the transmission housing were accurately built using C ATIA?Hypermesh software.Secondly,the 3D model of the transmission shaft and gear has been established using the Romax software,and forces and torques on transmission housing under all load cases were extracted;stress distribution of the transmission housing were calculated based on those forces and toques data.Thirdly,on the basis of the nominal stress method,the fatigue life prediction of the transmission housing was carried out with Optistruct software,and was judged whether satisfied or not.Then,study on modal theory was conducted,free mode and constraint mode were calculated.Verified that the free mode frequencies were qualified and constraint mode did not meet the requirement.At last,the topology optimization of the transmission housing was carried out,and the fatigue life was introduced into the topology optimization constraint to achieve the maximum stress reduction of the key parts of the transmission housing 36.33%.