Prediction of Performance of Involute Helical Gears by Observation of Tooth Contact Pattern. 1st Report. Prediction of Composite Error Surface as Function of Tooth Contact Pattern.

Abstract

Tooth contact pattern or tooth bearing pattern is the most common criterion used to check the state of gears in a gear box or on a meshing frame. From that pattern, ar. experienced gear engineer can determine, whether the manufacturing and/or the assembling of gears has realized the specified geometrical accuracy of gears and gear box. However, this technique of evaluating tooth contact pattern remains as pure empirical know-how of an experienced engineer. To realize this technique as an engineering method to be transfered easily to other engineers, a practical algorithm to generate the composite form deviation of mating tooth flanks defined on the plane of action, referred to as "composite error surface", as a function of tooth contact pattern of the gear set is proposed in this report. Upon combining this method with a simulation program to calculate the stresses induced in gears as a function of composite error surface, the prediction of gear performance as a function of tooth contact pattern becomes possible.