Lubricants
Influence of lubricating grease composition and run-in procedures on the formation of anti-wear tribolayers in rolling bearings
In this research project the influence of different operating conditions and lubricant oils
as well as greases on the buildup of tribological boundary layers during the run-in
phase of rolling bearings was investigated. By using theoretical and microanalytical
examination and the results of the experimental investigation fundamental propositions
about the prerequisites for the buildup of effective boundary layers and their protective
function were to be derived. The chosen model lubricants were tested with cylindrical
roller thrust bearings under wear-critical conditions (FE8-wear test) concerning their
wear protection and their ability to build up boundary layers. Most of the lubricants
showed insufficient wear protection and boundary layer buildup. By the variation of the
operating parameters bearing temperature, load and speed for all the tested lubricants
a boundary layer formation was achieved. In the following, the influence of the
boundary layers, which were formed out in the run-in processes, on the subsequent
wear protection in the FE8-wear test was examined. For most of the otherwise
unsuitable lubricants a very good wear protection was achieved following the
respective run-in processes. Thus, run-in procedures with rolling bearings are suitable
to achieve an increased operational reliability against wear, in dependence of the
lubricant.
The IGF project (17280 N) of the research association DGMK Deutsche Wissenschaftliche Gesellschaft für Erdöl, Erdgas und Kohle e.V., Überseering 40, 22297 Hamburg was funded by the Federal Ministry for Economic Affairs and Energy via the AiF within the framework of the programme for the promotion of joint industrial research (IGF) on the basis of a resolution of the German Bundestag.
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