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Research Article | Open Access

Grease film evolution in rolling elastohydrodynamic lubrication contacts

Xinming LI1( ), Feng GUO1, Gerhard POLL2, Yang FEI1, Ping YANG1
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266250, China
Institute of Machine Design and Tribology, Leibniz University Hannover, Hannover 30167, Germany
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Abstract

Although most rolling element bearings are grease lubricated, the underlying mechanisms of grease lubrication has not been fully explored. This study investigates grease film evolution with glass disc revolutions in rolling elastohydrodynamic lubrication (EHL) contacts. The evolution patterns of the grease films were highly related to the speed ranges and grease structures. The transference of thickener lumps, film thickness decay induced by starvation, and residual layer were recognized. The formation of an equilibrium film determined by the balance of lubricant loss and replenishment was analyzed. The primary mechanisms that dominate grease film formation in different lubricated contacts were clarified.

Keywords

grease lubricationrolling contactsstarvationreplenishmentelastohydrodynamic lubrication (EHL)

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Friction
Volume 9 Issue 1,
February 2021
Pages 179-190
DOI: 10.1007/s40544-020-0381-4

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Cite this article:
LI X, GUO F, POLL G, et al. Grease film evolution in rolling elastohydrodynamic lubrication contacts. Friction, 2021, 9(1): 179-190. https://doi.org/10.1007/s40544-020-0381-4

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Received: 18 December 2019
Revised: 13 February 2020
Accepted: 07 March 2020
Published: 26 August 2020
© The author(s) 2020

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