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Lubricants 2018, 6(1), 17; doi:10.3390/lubricants6010017

TEHL Simulation on the Influence of Lubricants on the Frictional Losses of DLC Coated Gears

Gear Research Centre (FZG), Technical University of Munich, Boltzmannstraße 15, 85748 Garching b. München, Germany
This paper is an extended version of an abstract published in World Tribology Congress 2017, Beijing, China, 17–22 September 2017.
Author to whom correspondence should be addressed.
Received: 6 December 2017 / Revised: 17 January 2018 / Accepted: 31 January 2018 / Published: 10 February 2018
(This article belongs to the Special Issue Selected Papers in the Sixth World Tribology Congress (WTC 2017))
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Diamond-Like Carbon (DLC) coatings can reduce fluid friction in TEHL contacts (thermo-elastohydrodynamic lubrication) of meshing gears. This study investigates the influence of different base oils i.e., mineral, polyalphaolefin and polyglycol oil on the friction of DLC coated spur gears. Thereby, a transient TEHL simulation model based on the finite element based full-system approach coupled iteratively with the thermal equations is applied, considering mechanical and thermal properties of the DLC coatings. Results show a clear reduction of fluid friction in DLC coated gears for all considered lubricants. This can be traced back to higher TEHL temperatures for DLC coated gears, which is due to its low thermal inertia resulting in a thermal insulation effect. View Full-Text
Keywords: elastohydrodynamic; DLC coatings; friction; gears; thermal insulation; EHL simulation elastohydrodynamic; DLC coatings; friction; gears; thermal insulation; EHL simulation

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Ziegltrum, A.; Lohner, T.; Stahl, K. TEHL Simulation on the Influence of Lubricants on the Frictional Losses of DLC Coated Gears. Lubricants 2018, 6, 17.

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