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The effect of surface texture on friction and lubrication of axial plain bearings
Knotek, Jan ; Hartl, Martin (referee) ; Šperka, Petr (advisor)
This paper deals with the influence of textures on friction and lubrication of axial plain bearings. Targeted texturing has the potential to affect the performance of mechanical components, where the main parameter is the friction coefficient and the thickness of the lubricating layer. Many experimental studies have been published so far, but few of them lead to a more detailed understanding of the function of textures on parallel surfaces and their interaction with a wedge-shaped gap. The problem was modeled in this work using a pin-on-disk configuration operated with controlled tilt in the hydrodynamic lubrication regime. In contrast to previously published studies, the thickness of the lubricating film was measured in real-time during the experiment using fluorescence microscopy, along with the friction coefficient. It has been demonstrated that textures are generally more beneficial in conditions with parallel surfaces compared to conditions with wedge-shaped gaps. For the case of parallel surfaces, the influence of partial texturing was identified, where the surface textured with a quarter of its area located at the entrance to the contact in the centerline led to the most positive results. In addition to partial texturing, the influence of texture size and the pattern of their distribution on the contact surface was confirmed. Parallel surfaces showed a high sensitivity of results to small changes in surface tilt. However, with increasing tilt, the effect of the wedge-shaped gap dominated over the effect of textures, and their contribution was typically in the range of single-digit to low double-digit percentages.
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