Design of a special gear tooth profile in accordance with geometric criteria and fatigue strength

Abstract

This paper shows the design of spur gears that uses special features in the

layout of the job profile of the teeth. The special profiles are defined by

mean of potential functions, while the conjugates profiles are calculated

by polynomial functions, to ensuring compliance with the basic law of

meshing. The designs of the gears with special profiles are compared

to an equivalent standardized modular gear. The Ansys Software is

used for modeling the equivalent Von Mises maximum stress, in order

to perform the estimation of fatigue life in the gears. The main results

of this research is found that the use of special profiles can reduce the

equivalent von Mises maximum stress in the transmission system by

up to 5.4 %, which is an element that enhances the safety factor in the

couple of special profiles, compared with the profile of normal module

system; it becomes in a prolongation of life to being gear damaged.