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Research Article | Open Access

Laser pattern-induced unidirectional lubricant flow for lubrication track replenishment

Chenglong LIU1,2, Feng GUO1( ), Patrick WONG2( ), Xinming LI1
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China
Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China
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Graphical Abstract

Abstract

Effective oil replenishment to the lubrication track of a running bearing is crucial to its sustainable operation. Reliable practical solutions are rare despite numerous theoretical studies were conducted in the last few decades. This paper proposes the use of surface effect, wettability gradient, to achieve the goal. This method is simple and can be nicely implemented using femtosecond laser ablation. A periodic comb-tooth-shaped pattern with anisotropic wetting capability is devised and its effect on the anisotropic spreading behaviour of an oil droplet is studied. Results show that the comb-tooth-shaped pattern enables the rearrangement of oil distribution, thereby escalating oil replenishment to the lubrication track. The effect is due to the unbalanced interfacial force created by the surface pattern. The influence of the shape and the pitch of teeth, which are the two governing factors, on oil transport is also reported. The effects of the newly devised surface pattern on lubrication are experimentally evaluated under the conditions of limited lubricant supply. These results are promising, demonstrating the reduction in bearing friction and the increase in lubricating film thickness.

Keywords

laser surface texturelimited lubricant supplycomb-tooth-shaped patternlubricant replenishmentfriction coefficient

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Friction
Volume 10 Issue 8,
August 2022
Pages 1234-1244
DOI: 10.1007/s40544-021-0528-y
Cite this article:
LIU C, GUO F, WONG P, et al. Laser pattern-induced unidirectional lubricant flow for lubrication track replenishment. Friction, 2022, 10(8): 1234-1244. https://doi.org/10.1007/s40544-021-0528-y

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Received: 04 December 2020
Revised: 05 March 2021
Accepted: 19 May 2021
Published: 12 August 2021
© The author(s) 2021.

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