Understanding micropitting in gears

Clarke, Alastair ORCID: https://orcid.org/0000-0002-3603-6000, Evans, Henry Peredur ORCID: https://orcid.org/0000-0002-6989-0190 and Snidle, Raymond ORCID: https://orcid.org/0000-0001-9333-7195 2016. Understanding micropitting in gears. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 10.1177/0954406215606934

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Abstract

Micropitting is a serious form of erosive wear, which can occur on the teeth of transmission gears. It is associated with roughness effects and surface fatigue and has become a particular problem in the speed-increasing gearboxes of wind turbines. This paper reviews the contributions which the authors have made towards an understanding of the basic mechanism of micropitting in gears based on analysis of the contact mechanics and elastohydrodynamic lubrication (EHL) of gear tooth surfaces under realistic operating conditions. Results are presented which demonstrate the crucial influence of EHL film thickness in relation to roughness (the ‘Λ ratio’) on predicted contact and near-surface fatigue. The important effect of plastic deformation, which takes place during the initial stage of running-in of gears, has also been investigated, and it has been shown that significant residual effects occur, which can contribute to the early formation of surface-initiated cracks.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	T Technology > TJ Mechanical engineering and machinery
Publisher:	Sage
Date of First Compliant Deposit:	30 March 2016
Date of Acceptance:	24 August 2015
Last Modified:	08 Nov 2023 13:37
URI:	https://orca.cardiff.ac.uk/id/eprint/76837

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