Analysis of Spur Gear Using Finite Element Analysis

The objective of this thesis is to study the various stress state of spur gear. We calculated the tangential and radial forces which acts on various point upon that basis we can analyze by applying the forces. By using Ansys software bending stress and contact stress on the tooth of spur gear drive is found Gears are machine elements used to transmit power between rotating shaft by means of engagement of projection called teeth. Gears are most common means of transmitting power in the wooden mechanical world. They vary from a tiny size used in watches to larger gears used in massive speed reducers, bridge lifting mechanism and rail road turn table drive. The gears are vital elements of main and auxiliary mechanism in many machines such as automobiles, tractors, metal cutting machine tools rolling mills hosting and transmitting and transporting machinery, massive engines etc. increasing competition. Therefore it becomes more and Reason for the Gear Tooth Failure: The different modes necessary to consider alternative technology of of failure of gear teeth are bending failure, pitting and manufacturing materials used for gears. scoring, corrosive wear. In bending failure-every gear The high volume production industry such as tooth acts as cantilever. If total repetitive dynamic load automobile industry has various manufacturing materials acting on the gear tooth is greater than the beam strength used gears like metal removal method, casting and forming of the gear tooth, then the gear tooth will fail in bending. method, but that method which is more suitable In pitting failure-it is surface fatigue failure which containing finishing operations optimal utilization of raw occurs due to many repetition of Hertz contact stress. The materials, short-cycle times and favorable energy failure occurs when the surface contact stresses are consumptions, compared to convectional manufacturing higher than the endurance limit of the material. technology. Scoring-it is a stick slip phenomenon in which Metal removal methods have the manufacturing alternate sharing and welding takes place rapidly at method profiling and generating methods. In profiling highest spots. It is avoided by properly designing the method, the spaces between the teeth are cut by means of parameters such as speed, pressure and proper flow a disc cutter and end milling cutter. lubricant. In generating method teeth are formed in a series of Corrosive wear-the corrosion of the tooth surfaces is passes by a generating tool. If it is threaded and gashed, namely caused due to the presence of corrosive elements it is called a hob and the process is known as "hobbing". such as additives present in the lubricating oils. To avoid Most of the structural part application is placed in these proper anticorrosive additives should be used. rolling mills and marine engines etc.