Experimental Study of the Effect of Thickener on the Film Thickness in the Contacts of a Grease-Lubricated Ball Bearing at Low Speed

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dc.contributor.authorOkál, Michalcs
dc.contributor.authorKošťál, Davidcs
dc.contributor.authorOsara, Jude A.cs
dc.contributor.authorLugt, Pietcs
dc.contributor.authorKřupka, Ivancs
dc.contributor.authorHartl, Martincs
dc.coverage.issue1cs
dc.coverage.volume68cs
dc.date.accessioned2025-07-31T11:56:03Z
dc.date.available2025-07-31T11:56:03Z
dc.date.issued2025-01-02cs
dc.description.abstractThe level of starvation in axially loaded grease lubricated ball bearings can be well described by the product of the base oil viscosity, the half contact width and the rotational speed (gbu). This paper highlights the effect of the thickener as another parameter for estimating the film thickness in a ball bearing. Film thickness measurements were done with an optical simulator of the ballon- disc configuration and a real ball bearing using the capacitance method. Three greases with the same base oil but different thickener types were selected for the experiments. Two greases followed the gbu model but the grease with alicyclic di-urea thickener produced a higher thickness than the model prediction, which is most likely caused by the formation of residual layers on the contact surfaces. The layer formation occurs in the first few hours of operation reaching a thickness of about 500–550 nm. Other greases also form layers, but they are comparable to prior observations, and they follow the model. The evolution of the normalized film thickness versus gbu in the case of alicyclic-di urea grease shows the same trend as the other grease types but with overall higher values.en
dc.formattextcs
dc.format.extent28-38cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationTRIBOLOGY TRANSACTIONS. 2025, vol. 68, issue 1, p. 28-38.en
dc.identifier.doi10.1080/10402004.2024.2431523cs
dc.identifier.issn1040-2004cs
dc.identifier.orcid0000-0002-4833-6588cs
dc.identifier.orcid0000-0003-1351-9373cs
dc.identifier.orcid0000-0002-9936-7480cs
dc.identifier.orcid0000-0001-5432-6645cs
dc.identifier.other193598cs
dc.identifier.researcheridF-6941-2012cs
dc.identifier.researcheridD-8147-2012cs
dc.identifier.researcheridD-8261-2012cs
dc.identifier.scopus55826337100cs
dc.identifier.scopus7005196946cs
dc.identifier.urihttps://hdl.handle.net/11012/255369
dc.language.isoencs
dc.publisherTaylor & Francis Group, LLC.cs
dc.relation.ispartofTRIBOLOGY TRANSACTIONScs
dc.relation.urihttps://www.tandfonline.com/doi/full/10.1080/10402004.2024.2431523cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1040-2004/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectEHL: greaseen
dc.subjectthickeneren
dc.subjectball bearingen
dc.titleExperimental Study of the Effect of Thickener on the Film Thickness in the Contacts of a Grease-Lubricated Ball Bearing at Low Speeden
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-193598en
sync.item.dbtypeVAVen
sync.item.insts2025.07.31 13:56:03en
sync.item.modts2025.07.31 13:32:56en
thesis.grantorVysoké učení technické v Brně. Fakulta strojního inženýrství. Ústav konstruovánícs
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