An Experimental Study on Film Thickness in a Rolling Bearing for Fresh and Mechanically Aged Lubricating Greases

Yuxin Zhou*, Rob Bosman, Piet M. Lugt

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    2 Citations (Scopus)
    30 Downloads (Pure)

    Abstract

    The lubricating film formation of greases has been widely studied using single contact ball-on-disc configurations. However, other than for oil, the film formation with grease is governed by starvation, which in a full bearing is clearly different from that of the single contact. In this paper, film thickness measurements for various greases in a shielded deep groove ball bearing will be presented. The results were obtained using an in-house-made film thickness measurement rig based on the ‘electric capacitance method’. It will be shown that the film thickness may deviate from the theoretical elastohydrodynamic film thickness calculated from the base oil and that the film thickness is not constant in time. It will also be shown that the film thickness for longer times is not only determined by the classical properties such as oil viscosity and grease bleed but also by shear degradation of its microstructure.

    Original languageEnglish
    Pages (from-to)557-566
    Number of pages10
    JournalTribology transactions
    Volume62
    Issue number4
    Early online date6 May 2019
    DOIs
    Publication statusPublished - 4 Jul 2019

    Fingerprint

    Bearings (structural)
    greases
    Lubricating greases
    Film thickness
    film thickness
    Oils
    Thickness measurement
    oils
    Deep groove ball bearings
    elastohydrodynamics
    ball bearings
    Elastohydrodynamics
    grooves
    balls
    Capacitance
    capacitance
    Viscosity
    viscosity
    degradation
    shear

    Keywords

    • UT-Hybrid-D
    • grease application
    • Greases
    • ball bearings

    Cite this

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    title = "An Experimental Study on Film Thickness in a Rolling Bearing for Fresh and Mechanically Aged Lubricating Greases",
    abstract = "The lubricating film formation of greases has been widely studied using single contact ball-on-disc configurations. However, other than for oil, the film formation with grease is governed by starvation, which in a full bearing is clearly different from that of the single contact. In this paper, film thickness measurements for various greases in a shielded deep groove ball bearing will be presented. The results were obtained using an in-house-made film thickness measurement rig based on the ‘electric capacitance method’. It will be shown that the film thickness may deviate from the theoretical elastohydrodynamic film thickness calculated from the base oil and that the film thickness is not constant in time. It will also be shown that the film thickness for longer times is not only determined by the classical properties such as oil viscosity and grease bleed but also by shear degradation of its microstructure.",
    keywords = "UT-Hybrid-D, grease application, Greases, ball bearings",
    author = "Yuxin Zhou and Rob Bosman and Lugt, {Piet M.}",
    note = "Taylor & Francis deal",
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    An Experimental Study on Film Thickness in a Rolling Bearing for Fresh and Mechanically Aged Lubricating Greases. / Zhou, Yuxin; Bosman, Rob; Lugt, Piet M.

    In: Tribology transactions, Vol. 62, No. 4, 04.07.2019, p. 557-566.

    Research output: Contribution to journalArticleAcademicpeer-review

    TY - JOUR

    T1 - An Experimental Study on Film Thickness in a Rolling Bearing for Fresh and Mechanically Aged Lubricating Greases

    AU - Zhou, Yuxin

    AU - Bosman, Rob

    AU - Lugt, Piet M.

    N1 - Taylor & Francis deal

    PY - 2019/7/4

    Y1 - 2019/7/4

    N2 - The lubricating film formation of greases has been widely studied using single contact ball-on-disc configurations. However, other than for oil, the film formation with grease is governed by starvation, which in a full bearing is clearly different from that of the single contact. In this paper, film thickness measurements for various greases in a shielded deep groove ball bearing will be presented. The results were obtained using an in-house-made film thickness measurement rig based on the ‘electric capacitance method’. It will be shown that the film thickness may deviate from the theoretical elastohydrodynamic film thickness calculated from the base oil and that the film thickness is not constant in time. It will also be shown that the film thickness for longer times is not only determined by the classical properties such as oil viscosity and grease bleed but also by shear degradation of its microstructure.

    AB - The lubricating film formation of greases has been widely studied using single contact ball-on-disc configurations. However, other than for oil, the film formation with grease is governed by starvation, which in a full bearing is clearly different from that of the single contact. In this paper, film thickness measurements for various greases in a shielded deep groove ball bearing will be presented. The results were obtained using an in-house-made film thickness measurement rig based on the ‘electric capacitance method’. It will be shown that the film thickness may deviate from the theoretical elastohydrodynamic film thickness calculated from the base oil and that the film thickness is not constant in time. It will also be shown that the film thickness for longer times is not only determined by the classical properties such as oil viscosity and grease bleed but also by shear degradation of its microstructure.

    KW - UT-Hybrid-D

    KW - grease application

    KW - Greases

    KW - ball bearings

    U2 - 10.1080/10402004.2018.1539202

    DO - 10.1080/10402004.2018.1539202

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    JO - Tribology transactions

    JF - Tribology transactions

    SN - 1040-2004

    IS - 4

    ER -