Contact Analysis And Profile Modification Study Of Automobile Transmission Gears

With the people’s requirement for more comfort of riding,Vibration decreasing and noise absorption is an important task of automobile industry. Reducing the noise of automobile not only is raising safe driving, but also is beneficial to the environment and avails to people health and improving the standard of living. Many fact show that the noise of gearbox is one of the main source of the automobiles noise, and that the noise of automobile gearbox is mainly from the gear drive.Large number of experiments and production practice shows that the reasonable tooth profile modification can effectively reduce the vibration and noise of the gear transmission. The task base on the fact working condition of the automobile gearbox, and analyze the primary cause of the noise and vibration of the gear transmission. Analyzing the gear tooth meshing process through the finite element method, reasonably determine the parameters of the gear modification and modification the gears, thus can reaching the purpose of reducing the noise and shaking of the gear transmission.First, discussing the solving process of the finite element analysis theory, expounding the solving function of the finite element analysis software ABAQUS, providing the theoretical basis for the contact analysis of the automobile transmission gears drive.Then under the principles of involute gear mesh derived equation of involute tooth profile, spiral equation, with rack-type cutting tools according to the processing gear tooth root principle of the transition curve obtained, commissioned under the project provided by the transmission gear parts diagram, based on the CAD software Pro/E to create a precise three-dimensional model of gear meshing, imported into finite element software ABAQUS for contact analysis, through literature review of the model study the issue of border interception, through the simulation results of two methods of interception, this model proved the rationality of the border interception. Finally, according to gear modification and the modification design theory, according to gear tooth contact analysis results to determine the amount of the initial top dressing. Compared with two kinds of modification methods to determine the effect of modification of tooth profile modification of the modification methods. Comparison of three kinds of modification curve of the modification to determine the effect of the modification curve for this article, through the analysis in the design of modified gear tooth contact under load during the load fluctuation law, discussing the modification of the amount of the different modification effects, determining the amount of modification under the load conditions in the design. Gear modification before and after the finite element analysis results show that tooth profile modification can improve the tooth contact stress distribution, elimination of stress concentration, improving the strength of gear contact and reducing errors caused by the base section of tooth interference and impact, this improve that the tooth profile used in this modification is effective and feasible.