Spur Gear Contact Stress Analysis and Stress Reduction by Experiment Method

Abstract—The gears are used for a wide range of industrial applications. They have varied application starting from textile looms to aviation industries, automobile gear box and machine tool application to transmitting the power. Their function is to convert input provided by prime mover into an output with lower speed and corresponding higher torque. Spur gears are used to transmit the power up to velocity ratio is ten. This phase they induce high stress at the point of contact. A pair of teeth in action is generally subjected to contact stresses causing fatigue failure of gear tooth. The main purpose of this study is to reduce the contact stress of gear by increasing the module of gear. One Spur gear train is selected for analysis. The Contact stress of existing gear train is calculated and compared with fatigue strengths of gear material. If this stress on gears are higher than fatigue strengths means gears are failed due to fatigue. To reduce the contact stress by increasing the module of gear. The contact stress are calculated by Hertz’s Equation and Strain gauge is used for the experimental investigation of the stress field