Spur Gear Analysis
ANALYSIS OF CONTACT STRESS OF SPUR GEAR BY FEM 1 Dr. JITENDRA KUMAR PANDEY, 2 CHANDRA PRAKASH
1 Associate Professor 2 M. Tech Student, Mechanical Engineering Department NRIIST BHOPAL (M.P) India
Email: 1jitendra.me@gmail.com, 2chandraprakash210@gmail.com
Abstract: Gears which are most widely used for transmission of power from one shaft to the shaft are considered in this paper for analysis and hence predict the stresses in them using the most versatile numerical techniques in practice, the Finite Element Method (FEM). In all spur gears are the most preferred type of gear because of simplicity of use & manufacturing with high degree of transmission efficiency. They develop high stress concentration at the root and the point of contact
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People now prefer cars with light weight and low engine sound. This opens up a demand for power transmission. Automobile industry is one of the largest manufacturers of gears. Light weight gears with high reliability are necessary to make light-weighted automobiles. The success in engine noise reduction promotes the production of quieter gears. Designing highly loaded spur gears for power transmission systems that are both strong and quiet requires analysis methods that can easily be implemented and also provide information on contact stresses. The finite element method is capable of providing this information, but the time needed to create such geometry is large. In order to reduce the modeling time, a pre-processor method that creates the geometry needed for a finite element analysis is used. Modeling software like Pro Engineer, Solid Works, CATIA and many more are the best option available to create complex geometry for analysis. In this paper, CATIA is used to create the Gear geometry and then it is imported in ANSYS Workbench 13.0 for analysis. The results of ANSYS 13.0 are then compared with the AGMA standards for the specified gear set in contact. The purpose of this project is to develop a general model to study bending stress of spur gears in …show more content…
Application of FEM in stress analysis of spur gear & convergence study of a few finite elements. Validation of the results from the finite element analysis, with the results obtained according to AGMA standards.
2.2 Modeling Set up
The first step in this paper is to model a spur gear assembly. The most complicated part in spur gear is the involute profile of its teeth. There are a number of ways of creating involute profile of a spur gear. In this paper, the spur gear model was designed in CATIA design workbench. CATIA is a suite of programs, which are basically used in designing and manufacturing a range of products. By defining the parameters and relation in CATIA final gear model will look like Fig.2 and by changing the parameters, angular degree (a), module (m), and number of teeth (z) we will get different gears.
Fig.2 Solid model of gear in CATIA
Hertz theory assumes the gear teeth as an equivalent contacting cylinder. Therefore the gear can be modelled by two contacting parallel cylinders with the properties described in following
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