Theoretical and experimental investigations about flank breakage in bevel gears

• Type: Article in International Scientific Journal
• Date: 2011

Authors

Jorge Seabra (Author) FEUP; Klein, M (Author) Other; Höhn, B (Author) Other; Michaelis, K (Author) Other; Annast, R (Author) Other

Journal

Title: Industrial Lubrication and Tribology

Vol. 63

Pages: 5-10

Publisher: Emerald

Indexing

Scopus - 0 Citations

Other information

Authenticus ID: P-00K-VB5

DOI: 10.1108/00368791111101786

Abstract (EN): A failure mode called ¿flank breakage¿ is increasingly observed in cylindrical and bevel gears. Up to now, there was no calculation method available to determine the load¿carrying capacity related to flank breakage in bevel gears. Therefore, a research project was initiated to investigate the described failure mode in bevel gears and to develop a calculation method to predict the risk of flank breakage of such gears. The purpose of this paper is to describe this project. The presented research project contained: determination of the decisive influence parameters in experimental investigations with bevel gears; development of a model to explain flank breakage in bevel gears; and development of a calculation method and design rules to avoid flank breakage. In systematic tests, the influenced parameters of flank breakage were investigated. Besides the load torque, especially the case depth and the core hardness turned out as decisive parameters. A higher sulfur concentration in the material does not seem to be critical. The analysis of damage patterns of test and practical gears showed that the initiating crack always started below the surface in the region of the transition from case to core. For unidirectional loading, the crack propagates to the active flank on the one side and to the tooth root on the other side. On the basis of these findings, a local and a simplified calculation method were developed to estimate the risk of flank breakage. With the described calculation method, it is now possible to evaluate running gears according to their risk of flank breakage and design new gears with a sufficient safety factor to avoid this failure. © 2011, Emerald Group Publishing Limited

Language: English

Type (Professor's evaluation): Scientific