In this article are comparison HCR and Convex-Concave (C-C) gearing from the point of view to pitting. The introduction of the article describes a fundamental difference between the involute HCR and noninvolute (C-C) gearing and the influence of some parameters, especially of the slip ratio to damage of gearing. The paper also shows the basic results of the experiment, which was executed on two types of gearing (involute HCR gearing and noninvolute C-C gearing) on the Niemann's stand from the point of view damage flank of tooth to pitting.
