Comparison of Bending Stress on Circular and Elliptical Profile Fillet of Helical Gear Using AGMA and ANSYS

Mechanical

Gear tends to play a very vital role in all industries for power transmission between shafts. It is a critical mechanical component in a mechanical power transmission system. A pair of helical gear generally subjected to two types of repeated load, one is bending load and another is surface load. Two types of stresses developed in helical gear pairs are: Bending stress (causing bending fatigue) and contact stress (causing contact fatigue). Both stresses act at a time at the same point of contact. If the both stresses attain their maximum value, the failure of gear occurs mainly in two distinct regions, which are tooth flank and the tooth root fillet. These types of tooth failure can be minimized or can be avoided by taking greater care during the design stage by avoiding the problem and creating a proper tooth surface profile with the better manufacturing method. This thesis reviews the methodology used to investigate bending strength of helical gear. Bending stress plays a vital role in gear design and manufacturing to reduce failure and cost. Magnitude of bending stress is controlled by the nominal bending stress and the stress concentration due to the geometrical shape. This work shows that the bending stress estimation for different shape of tooth root fillet. AGMA and ANSYS is used to estimate bending stresses at tooth root fillet and suggestion for best suited shape of tooth fillet.

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