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This work was carried out as a part of the Collaborative Applied Research Project, CIT-020000-2008-032, financed by the Spanish Ministry of Science and Innovation. The authors would also like to thank the Lubricants Laboratory of Repsol-YPF.

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Analytical model for predicting the friction coefficient in point contacts with thermal elastohydrodynamic lubrication

Publicado en:Proceedings Of The Institution Of Mechanical Engineers Part J-Journal Of Engineering Tribology. 225 (J4): 181-191 - 2011-04-01 225(J4), DOI: 10.1177/1350650111398848

Autores: Echavarri Otero, J; Lafont Morgado, P; Chacon Tanarro, E; de la Guerra Ochoa, E; Diaz Lantada, A; Munoz-Guijosa, I M; Munoz Sanz, I L

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Resumen

This article presents analytical friction prediction models applicable to lubricants in point contacts under thermal elastohydrodynamic lubrication (TEHL). The types of models used consider the heat generated and its penetration into the bulk of the contacting solids. Therefore, the increase in temperature is determined, which causes important variations in the operating conditions. The article sets out the hypotheses assumed, the theoretical calculation procedures and the ensuing equations for determining the friction coefficient under TEHL. An experimental stage is performed on a mini-traction-machine, which allows the measurement of friction coefficient in ball-disc contacts under a wide range of control parameters involved in TEHL, such as lubricant bath temperature, load, average velocity slide-to-roll ratio, and contacting materials. The experimental results for different lubricants are compared to those given by the models, and show the proposed models to be accurate for predicting the friction coefficient.

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