Most of the rolling bearings work under starvation conditions. The quantitative measurement of the oil layer may provide a new perspective on the rolling bearing lubrication. In this research, the laser-induced fluorescence technique was utilized to measure the oil layer thickness out of the contact on a modified angular contact ball bearing testing apparatus. The forms of oil supply for the ball-outer-ring contact at various speeds were studied, as well as the influences of centrifugal forces.

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