Behaviour of EHL Films under Lateral Vibrations

Behaviour of EHL Films under Lateral Vibrations

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Any machine components, including roller bearings, gears, cams and followers, do not operate under ideal steady-state conditions. Elastohydrodynamic lubricating (EHL) films, separating surfaces of these elements, are affected by vibrations and by variation of operating parameters (speed, load, surface curvature) over time. Previous findings of other authors have shown that the exposure of EHL contacts to transient conditions can cause a film failure but on the other hand it can also improve a lubrication performance according to the particular conditions. In the present article the film thickness behaviour under a lateral harmonic motion is investigated. A colorimetric interferometry method was used to evaluate the film thickness distribution in point contact observed by high-speed camera. The EHL contact was formed between a transparent flat disc and a steel ball. It was subjected to rolling motion simultaneously with sliding harmonic motion of ball in a transverse direction to the main rolling direction. Experimental results of this study demonstrate the effects of different frequencies of harmonic motion on the distribution of the lubricant film thickness.

Any machine components, including roller bearings, gears, cams and followers, do not operate under ideal steady-state conditions. Elastohydrodynamic lubricating (EHL) films, separating surfaces of these elements, are affected by vibrations and by variation of operating parameters (speed, load, surface curvature) over time. Previous findings of other authors have shown that the exposure of EHL contacts to transient conditions can cause a film failure but on the other hand it can also improve a lubrication performance according to the particular conditions. In the present article the film thickness behaviour under a lateral harmonic motion is investigated. A colorimetric interferometry method was used to evaluate the film thickness distribution in point contact observed by high-speed camera. The EHL contact was formed between a transparent flat disc and a steel ball. It was subjected to rolling motion simultaneously with sliding harmonic motion of ball in a transverse direction to the main rolling direction. Experimental results of this study demonstrate the effects of different frequencies of harmonic motion on the distribution of the lubricant film thickness.

transient, non-steady conditions, EHL, side slip, film thickness, oscillatory motion

transient, non-steady conditions, EHL, side slip, film thickness, oscillatory motion

FRÝZA, J.; ŠPERKA, P.; KŘUPKA, I.; HARTL, M.

2016

09.09.2015

Slovak University of Agriculture in Nitra

Nitra

978-80-552-1377-4

Book of Proceedings of 56th International Conference of Machine Design Departments

First

349

352

4