The Use of Elastohydrodynamic Lubrication in Understanding Bearing Performance

This paper is a survey introduction to elastohydrodynamic (EHD) lubrication for the practicing engineer. A brief description of the theoretical background and experimental evidence of the EHD lubricant film existing in concentrated contracts as found in bearings and gears is provided. The influence of the range of EHD and partial EHD lubricant conditions on bearing performance and mode of fatigue is next explored. The evidence discussed is drawn primarily from carburized and hardened tapered roller bearings tested under a wide range of environmental conditions.