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The Analysis on Grease Lubrication at Two Tapered Bodies Contact Considering Surface Roughness

Die Analyse der Fettschmierung an zwei konischen Körperkontakten unter Berücksichtigung der Oberflächenrauheit

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Abstract

Considering surface roughness and non-equal cross-section feature of tapered body and non-Newtonian characters of grease, fresh grease lubrication problem at two tapered bodies contact in the initial lubrication stage was analyzed, and effects of profile crowning, misalignment (tilting and skewing), sliding and loads were included. The multigrid method was applied to grease lubrication simulation by linear interpolation of rough surfaces and the discrete convolution and FFT (DC-FFT) was employed to compute elastic deformation. The results show that grease film thickness decreases with sliding aggravation. Both surface roughness and tilting motion will weaken the effectiveness of crowning and deteriorate the film bearing capacity. The adaptability of the tapered body with the cut-off profile to tilting motion is better than that with the logarithmic profile. However, if the cut-off profile is adopted, the crowning radius at small end of the tapered body should be larger than that at large end. The effect of minor skewing on grease lubrication is relatively slight. In a wide range of speed, the variation of traction coefficient is similar to the typical Stribeck curve, and the contact would experience three states of full-film, mixed and boundary lubrication.

Zusammenfassung

Unter Berücksichtigung der Oberflächenrauheit und der ungleichen Querschnittsmerkmale des Kegelkörpers und der nicht-Newtonschen Merkmale des Schmierfetts wurde das Problem der Frischfettschmierung bei Kontakt zweier Kegelkörper in der Anfangsschmierungsphase analysiert und die Effekten vom Konturänderung, Fehlausrichtung (Kippen und Schräglauf), Rutschen und Lasten waren enthalten. Die Multigrid-Methode wurde auf die Schmierfettsimulation durch lineare Interpolation von rauen Oberflächen angewendet, und die diskrete Faltung und FFT (DC-FFT) wurden benutzt, um die elastische Verformung zu berechnen. Die Ergebnisse zeigen, dass die Fettfilmdicke mit zunehmender Verschlechterung des Rutschens abnimmt. Sowohl die Oberflächenrauheit als auch die Kippbewegung werden die Wirksamkeit des Konturänderungs schwächen und die Filmtragfähigkeit verschlechtern. Die Anpassungsfähigkeit des sich verjüngenden Körpers mit dem cut-off Profil an eine Kippbewegung ist besser als die mit dem logarithmischen Profil. Wenn jedoch das cut-off Profil übernommen wird, sollte der Balligkeitsradius am kleinen Ende des sich verjüngenden Körpers größer sein als am großen Ende. Der Effekt eines geringen Schräglaufs auf die Fettschmierung ist relativ gering. In einem weiten Geschwindigkeitsbereich ist die Variation des Traktionskoeffizienten der typischen Stribeck-Kurve ähnlich, und der Kontakt würde drei Zustände der Vollfilm-, Misch- und Grenzflächenschmierung erleben.

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Funding

The paper is supported by the National Natural Science Foundation of China (Grand No. 51675427).

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Authors and Affiliations

  1. School of Mechatronical Engineering, Northwestern Polytechnical University, 710072, Xi’an, China

    Zhenghai Wu, Yingqiang Xu & Kaian Liu

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  1. Zhenghai Wu
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  2. Yingqiang Xu
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  3. Kaian Liu
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Correspondence to Yingqiang Xu.

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Conflict of interest

Z. Wu, Y. Xu and K. Liu declare that they have no competing interests.

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Wu, Z., Xu, Y. & Liu, K. The Analysis on Grease Lubrication at Two Tapered Bodies Contact Considering Surface Roughness. Forsch Ingenieurwes 83, 339–350 (2019). https://doi.org/10.1007/s10010-019-00350-9

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