Abstract:

                    Spur gear and Bevel gear have variety of application in different field. The main problem of gear is failure due to root bending stress and surface contact stress. Experimental, theoretical and numerical research of bending stress analysis is done by many researchers in years. In this paper only theoretical and numerical methods are used as experimental research are expensive and time consuming. Bending stress is the reason behind breakage or fatigue failure of tooth .The main objective of this paper is to analyze the  bending Stress of gears at various pressure angle and at various axis orientation. At various pressure angle such as spur gear of pressure angle 20° and 25° and orientation axis such as spur gear with pressure angle 20° have parallel axis and bevel gear with pressure angle 20° have intersecting axis. For modeling and assembling of gears Creo parametric 2.0 was used. Two exactly similar gear are taken for assembling. The gears which are designed have same parameters which can be kept same. The three dimensional gear which were designed were analyzed with ANSYS Workbench 14.0. Each gear ANSYS results is compared with theoretical results for validation. Spur gear with theoretical Lewis Equation and Bevel gear with tooth bending stress AGMA standard. After Validation of results, comparison is done among spur gear pair of pressure angle 20°, spur gear pair of pressure angle 25° and bevel gear of 20° to evaluate  which gear pair have less bending stress value.   

Keywords: ANSYS, Lewis equation, von Mises Stress, spur gear, bevel gear