Material Selection for Optimum Design of Planetary Gear Train used in Automobile Gear Box

Abstract

Planetary Gear Trains are used in different applications like power transmitting systems of machine tools and so on. Planetary gear boxes are used frequently to match the inertias, lower the motor speed, boost the Torque, and at the same time provide a study mechanical interface for pulleys, cams, drums and other mechanical components. Gears in planetary gear boxes sometimes get short life due to wear and breakage by repetitive load during operation time. Even if failure of a single tooth of a gear will make the machine to stop. Hence our aim is to strengthen the gear which is a key element of gear box. In this project I needed to suggest appropriate gear material by considering its Young's modulus, Yield Strength, Hardness, coefficient of friction. The materials utilized for gears are nodular graphite cast iron. The material properties and costing of pinion and gear material were studied, and standard gear materials were identified from PSG Design Data Book. The selection of the gear materials is based on some multi criteria decision making methods (MCDM) like TOPSIS, VIKOR and Weighted properties. The material or gear has selected by using above mentioned criteria methods. After the material selection than a planetary gear set has designed by convectional method and MAT Lab coding is generated within allowable bending and compressive strength. Then comparison is done to predict the Weight and Volume of the both gear trains. Then a motion analysis on currently used material and the selected material of gear train. The modelling and motion analysis is done by using the solid works.