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Computer Aided Spur Gear Design and Analysis

Edward M. Vavrek Purdue University North Central

I. Introduction

This paper describes a spur gear analysis program written in visual basic. The program is used to assist students to learn the procedures to size and select spur gears. The class that this is used in is called machine elements (MET-214). It is a second level mechanical engineering technology course. The student’s background coming in to this course includes statics, dynamics, and strength of materials. The course covers topics related to mechanical design. Students learn the concepts and procedures to size and select components such as gears, bearings, belt drives, shafts, clutches, and brakes. The program provides the data necessary to analyze and make the decisions to properly select these components.

The focus of this paper is on the procedure used to size and select a spur gear using a software program. Spur gears are used in many machine design applications. The selection process of a spur gear system involves many calculations and decisions. This software program simplifies and streamlines the design and selection process. The program is written in visual basic, which is an event driven program. The user can go through the program inputting values into text boxes and initiating events by clicking on command buttons. Visual basic was used because of its windows environment in which most users would feel comfortable using. Also, the most important feature of this program is the ability to insert pictures, tables, graphs, drawings, and figures to enhance the program functionality. The program is visual and interactive which helps guide the user through the design process. While the user should have some basic knowledge of gears, the program assists the user through the design process. Most inputs are taken from graphs, charts, or tables so the user knows where and how the information is obtained and used. Outputs are shown with their appropriated figures or drawings to assist the user in understanding how the output was determined and how it is used. What this means is the user does not have to have a gear design book at his side in order to interpret results or to get input data.

II. Spur Gear Background

The selection of spur gear material is based on two factors, bending stress and contact stress. Bending stress in a gear is based on the concept that gear teeth act similar to a cantilever beam with a bending force applied to them. The bending stress, st, is calculated based on the shape,

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Vavrek, E. (2001, June), Computer Aided Spur Gear Design And Analysis Paper presented at 2001 Annual Conference, Albuquerque, New Mexico. 10.18260/1-2--9021