Sonlu Eleman Yöntemi İle Düz Dişlilerde Temas Gerilmelerinin İncelenmesi

Abstract

Gears are one of the most critical elements in power transmission because it plays a significant role in the industry. Spur gear is used to transmit power and rotary motion between parallel shafts. It is one of the simplest types of the gears. Surface failure of the gear tooth is a pitting when contact stress is exceeding the strength of the material to surface fatigue. This paper studies the contact stresses in the contact zone among the spur gear pairs by using finite element method under static conditions. Contact stress among the gear tooth pair’s engagement determines the facility of the gear to transmit the power without harm. The contact stress in gears has played an important role for last years, but an extensive research is still required to understand the several parameters affecting this stress. Among these parameters, the most important factors affecting the surface contact stress are; number of teeth, module and face width. In the present study, the contact stress in spur gear is calculated by changing one of these parameters and keeping remaining constant to obtain the influence of each parameter on contact stress separately based on AGMA's equations and finite element method (FEM). A computer program is used to build up the gears by using homemade software and SolidWorks. The results of the FEM analyses from MSC Software (MARC) are presented. These results are compared with the theoretical results (AGMA’s equations). The contact stress achieved by FEM is lower than the obtained results by AGMA's equations and the corresponding percent difference detected are about 8 %. The results of the contact stress analysis specify that increasing the values of geometrical parameters (number of teeth, module and face width) lead to decrease in the tooth contact stress.