On the interest of a semi-empirical model for the tooth friction coefficient in gear transmissions. (December 2021)

• Record Type: Journal Article
• Authors: Quiban, Romain; Grenet De Bechillon, Nicolas; Touret, Thomas; Navet, Pierre; Diab, Yasser; Cavoret, Jérôme; Ville, Fabrice; Changenet, Christophe
• Is Part Of: Proceedings of the Institution of Mechanical Engineers. Volume 235:Number 12(2021)
• Page Start: 2654
• Page End: 2663
• Publication Date: 2021-12
• Subjects: Friction -- boundary regime -- mixed regime -- two discs -- gears; Tribology -- Periodicals; 621.89
• DOI: 10.1177/13506501211052179
• Languages: English
• ISSNs: 1350-6501

Abstract

Accurate modelling of friction coefficient is of primary importance in efficiency, vibration and failure analyses of enclosed gear drives. After showing the influence of surface/lubricant interactions on friction, the authors used a semi-empirical model which can take all these aspects into account. Lubricant is modelled as an Eyring–Reynolds fluid and rough surfaces are described with two parameters via a stochastic approach. A specific two-disc machine is used to perform series of friction measurements on smooth and rough discs. Smooth discs allow to operate under full film lubrication and to measure a reference shear stress of lubricant, whereas rough discs reproduce gear tooth roughness and generate a representative value of friction on asperities. The purpose of this present paper is to describe calculations of this physical-based friction coefficient model and to present the experimental process. On the basis of new results, the impact of a surface finishing process is assessed as well as the consequence of calculating friction coefficient based on oil injection instead of local bulk temperature.