Experimental study of starved EHL contacts based on thickness of oil layer in the contact inlet

• Study of starved EHL contacts based on thickness of oil layer in contact inlet.
• Two-elements optical test rig used for film thickness measurement.
• Spherical roller provides input oil layer for the second starved circular contact.
• Experimental approach validated through the comparison with theoretical simulations.

Starved lubrication conditions bring the risk of the damage of machine components. The experimental simulation of starved conditions is connected with the need to define the input conditions to joint the amount of the oil entering the contact with the resulting film thickness. This paper describes the experimental approach based on the thickness of the oil layer entering the starved contact. The use of multiple contacts optical test rig based on thin film colorimetric interferometry for film thickness measurement has enabled to simulate starved conditions and to compare the obtained results with theoretical prediction. The first elliptical contact between spherical roller and the glass disc is used to supply the defined oil layer to the second contact formed between the steel ball and the glass disc. Through the comparison with the theoretical prediction it was found that acceptable input conditions for the study of starved contacts can be achieved with such test rig configuration.

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