About the change of flow factors during the run-in process of lubricated contacts
Industrial Lubrication and Tribology
ISSN: 0036-8792
Article publication date: 20 October 2021
Issue publication date: 29 March 2022
Abstract
Purpose
This paper aims to increase the knowledge of the run-in process of lubricated contacts in hydraulical pumps. When performing EHL simulations of tribological contacts, the surface influence needs to be taken into account. This experimental measurement wants to investigate the amount of change of the flow factors in the first hour of run of tribological contacts.
Design/methodology/approach
An experimental test bench is used to run-in several samples. After several minutes of running, samples are removed and the surface structure is captured using a digital microscope. With the measured data, flow factors are calculated.
Findings
The findings were clear that flow factors are highly direction-dependent, especially shear flow factors in radial directions experience almost no change. Overall, influence of the surface structure of up to 30% compared to a flat surface can be registered.
Originality/value
This paper helps to choose application-oriented values for the simulation of tribological contacts.
Keywords
Acknowledgements
The IGF research project 20083N/1 of the research association Forschungskuratorium Maschinenbau e. V. – FKM, Lyoner Straße 18, 60528 Frankfurt am Main was supported from the budget of the Federal Ministry of Economic Affairs through the AiF within the scope of a program to support industrial community research and development (IGF) based on a decision of the German Bundestag.
Citation
Holzer, A. and Schmitz, K. (2022), "About the change of flow factors during the run-in process of lubricated contacts", Industrial Lubrication and Tribology, Vol. 74 No. 3, pp. 316-323. https://doi.org/10.1108/ILT-06-2021-0216
Publisher
:Emerald Publishing Limited
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