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Oil drop formation at the outlet of an elastohydrodynamic lubricated point contact
Luleå tekniska universitet.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
1995 (English)In: Journal of tribology, ISSN 0742-4787, E-ISSN 1528-8897, Vol. 117, no 1, p. 74-79Article in journal (Refereed) Published
Abstract [en]

The loss of lubricant from grease-lubricated bearing surfaces is determined by a number of different mechanisms such as side-flow out of the contacts, evaporation, drop formation, oxidation etc. Some of the drops formed behind a rolling element in a bearing will be onrolled by the next rolling element but some will be lost from the bearing. This loss of lubricant is dependent to a high degree on the speed of the air flow through the bearing and is one of the reasons for early failure of grease lubrication in bearings operating in strong, axial air streams. To evaluate the most important parameters in drop formation, the droplets being thrown out from the outlet of an elastohydrodynamic contact were analyzed using picture processing and statistical methods. An empirical model has been built to describe mathematically the principal factors involved in the volume flow thrown out into the air at the outlet side of the Hertzian contact area. For example, drops in a ball bearing will contribute to the inlet feed of oil for the next ball if it is not lost by sideways flow out from the bearing.

Place, publisher, year, edition, pages
1995. Vol. 117, no 1, p. 74-79
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-3965DOI: 10.1115/1.2830609Local ID: 1cfe64f0-c25e-11db-9ea3-000ea68e967bOAI: oai:DiVA.org:ltu-3965DiVA: diva2:976827
Note
Godkänd; 1995; 20070202 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-01-10Bibliographically approved

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Larsson-Kråik, Per-OlofHöglund, Erik
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