Abstract
ABSTRACT When a hydrodynamic journal bearing works under an excessively heavy load, there occurs the very small bearing clearance where physical adsorbed layer boundary lubrication is present. For evaluating the performance of such a hydrodynamic journal bearing, an analysis is here presented by incorporating both the hydrodynamic lubrication and the boundary lubrication which respectively occur in different lubricated areas. The calculation results show that the boundary lubrication effect significantly increases the lubricating film pressure and load-carrying capacity of the bearing especially when the fluid-bearing surface interaction is strong, as compared to the conventional hydrodynamic lubrication theory calculations; Stronger the boundary lubrication, closer to the exit of the bearing the location where the maximum film pressure occurs, and nearer to the minimum bearing surface separation the exit of the bearing.
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