Sachidananda, H K and Raghunandana, K (2014) Effect of Bending and Contact Stresses in Altered Tooth-Sum Gearing. International Journal of Emerging Technology and Advanced Engineering, 4 (9). pp. 7-12. ISSN 2250-2459

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Abstract

For the design of gears the stress due to bending and contact plays a significant role. The stress from bending is largest in the root of the gear teeth, and the magnitude of the maximum stress is controlled by the nominal bending stress and stress concentration due to the geometric shape of the tooth. The tooth failure due to pitting is dependent on the contact stresses developed between the gear pair. This paper examines the effect of bending stress and contact stress in altered tooth-sum gearing when the tooth-sum is altered by ±4% of the tooth-sum. The load carrying capability of the spur gear tooth is analyzed for a tooth sum of 100 operating between a specified center distance and the effects of tangential, radial force, contact stress and bending stress is analyzed. This paper discusses an alternate yet simple method of improving bending strength and contact stresses by way of altering the tooth-sum. Altering the tooth-sum working between a specified center distance for a given module changes the operating pressure angle and hence necessitates profile shift. Using this profile shift gears can be designed to advantage.

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