Static And Dynamic Mechanical Analysis Of Automotive Gearbox Casing

Automotive gearbox casing is the framework of the whole auto transmission, providing for installation of corresponding movement space and the channel for coolant and lubricants in the internal, while packing the drive and shift gear of transmission and connecting with the whole machine in the external. Auto transmission box working environment is very bad, undertaking different gear cyclical change force, pull, pressure, bend, twist, and vibration caused by complex stress state. Therefore, as a major part of the vehicle drivetrain, the researching of automotive gearbox casing has the extremely vital significance.First, a model of automotive transmission as the research object in this paper, in-depth reserched the modeling process of the automotive gearbox casing. The automotive gearbox casing three-dimensional solid model was created in the Pro/E software, and after a reasonable simplification was exported to software ANSYS. Selected unit type and defined material properties, mesh, applied load, defined the boundary condition, ultimately got the finite element model of automotive gearbox casing.Then, based on finite element analysis theory, the automotive gearbox casing carried out a static analysis, through the first and reverse gear calculation of structure strength analysis, the strength obtained in the gearbox casing meet the request, safe and reliable power system can guarantee the normal delivery, but the safety factor of the box and the design tends to conservative.The thesis carried out a modal analysis for the automotive gearbox casing by using ANSYS, extracted of the automotive gearbox casing of the former16-order mode and frequency, in order to lay the foundation for dynamic response analysis. Through the harmonic response analysis, this thesis simulates the impact of the transmission vibration excitation on the box, in order to propose the improvements for the choice of engine operating parameters and design of the box.Finally, dynamics simulation for the automotive transmission was carried out with ADAMS. The aim is to solve transient load on box at first and reverse gear. Using ANSYS transient analysis module analyzed the transient response of automotive gearbox casing at first and reverse gear. Provided a theoretical basis to further improve the structure of the automotive gearbox casing and overcome the weaknesses.This study guides and improves the design of automotive gearbox casing. The results of the analysis can be used to develop new models, effectively shorten the design cycle, and reduce the cost of design.