2619 点接触油不足 EHL 油膜厚さに及ぼす側方流れの影響

概要

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In a high speed spindle assembled in machine tools, ball bearings has been often lubricated with a minute amount of lubricant to reduce a temperature rise due to viscous drag and churning. Small lubricant supply rate may give rise to a starved lubrication condition, especially in a high speed condition. To avoid fatal seizure of the bearing, lubricant behavior in the vicinity of ball-race contacts must be clarified in the above situation. In this report, lubricant walls at the sides of a contact footprint, called side bands, is noted because there exists significant portion of lubricant in these walls. It is assumed that the lubricant in these walls can re-flow to the contact area if only a small misalignment between two successive ball tracks. Effect of the re-flow from the walls on central film thickness is investigated by interferometric measurement.
2003-08-05