Replenishment Differences in EHL Contact Lubricated by New and In-bearings-aged Grease

Abstract

In-contact replenishment differences between new and aged grease are studied using ball-on-disc optical fluorescence. Three different greases were aged in rolling bearings for 30 -50 % of their predicted life. A considerable effort is focused on fluorescence calibration, so that differences in lubricant volume can be quantified. No changes in replenishment between new and aged samples were found in one grease. The other two greases were contaminated by metal particles and iron oxide powder. Grease fluorescence was quenched by contaminants and linear relation between intensity values and film thickness did not apply for samples with heaviest contamination. Nevertheless, strong link between the degree of contamination and lubricant replenishment was found.

Research on Anti-Wear Properties of Nano-Lubricated High-Speed Rolling Bearings under Various Working Conditions

“…Nanoscale lubrication has received much attention from researchers as a method for reducing the wear of materials. Common lubrication methods include grease lubrication [16], oil lubrication [17], and water lubrication [18]. Owing to its advantages of high temperature resistance and good lubricity, oil-based lubrication has been widely used and has achieved obvious results.…”