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RESEARCH PAPERS

Influence of Linear Profile Modification and Loading Conditions on The Dynamic Tooth Load and Stress of High-Contact-Ratio Spur Gears

[+] Author and Article Information
Chinwai Lee, Hsiang Hsi Lin

Department of Mechanical Engineering, Memphis State University, Memphis, TN 38152

Fred B. Oswald, Dennis P. Townsend

Mechanical Systems Technology Branch, NASA Lewis Research Center, Cleveland, OH 44135

J. Mech. Des 113(4), 473-480 (Dec 01, 1991) (8 pages) doi:10.1115/1.2912807 History: Received September 01, 1990; Online June 02, 2008

Abstract

This paper presents a computer simulation for the dynamic response of high-contact-ratio spur gear transmissions. High contact ratio gears have the potential to produce lower dynamic tooth loads and minimum root stress but they can be sensitive to tooth profile errors. The analysis presented in this paper examines various profile modifications under realistic loading conditions. The effect of these modifications on the dynamic load (force) between mating gear teeth and the dynamic root stress is presented. Since the contact stress is dependent on the dynamic load, minimizing dynamic loads will also minimize contact stresses. This paper shows that the combination of profile modification and the applied load (torque) carried by a gear system has a significant influence on gear dynamics. The ideal modification at one value of applied load will not be the best solution for a different load. High-contact-ratio gears were found to require less modification than standard low-contact-ratio gears. High-contact-ratio gears are more adversely affected by excess modification than by under modification. In addition, the optimal profile modification required to minimize the dynamic load (hence the contact stress) on a gear tooth differs from the optimal modification required to minimize the dynamic root (bending) stress. Computer simulation can help find the design tradeoffs to determine the best profile modification to satisfy the conflicting constraints of minimizing both the load and root stress in gears which must operate over a range of applied loads.

Copyright © 1991 by The American Society of Mechanical Engineers
Topics: Stress , Gears , Stress , Spur gears
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