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T Lohner, J Mayer, K Michaelis, B-R Höhn, K Stahl . Journal of Engineering Tribology. March 26, 2015 .
Forschungsstelle fuer Zahnraeder und Getriebebau (Gear Research Centre) – FZG, Technische Universitaet Muenchen, Boltzmannstraße 15, Garching 85748, Germany.
Abstract
The first operating period of machine elements is subject to a running-in phase. Thereby, stresses applied on the contacting surfaces are influenced by the running-in conditions including the lubricant used and can strongly affect the frictional behavior and load-carrying capacity of lubricated contacts after running-in. This study investigates the influences of operating conditions and lubricant additives on the running-in behavior of lubricated line contacts of discs and gears. Results show a strong influence of the lubricant additive on the coefficient of friction during running-in as well as on the surface roughness and surface condition after running-in. The specific boundary friction power, supplemented by considering load carrying capacity limits, has been introduced as a criterion for defining the running-in conditions of gears.
