Abstract
The analysis of experimental and theoretical results, from constant temperature scuffing tests with FZG type A gears lubricated with base oils, show a good agreement between the scuffing loads and the scuffing lubricant film thickness, meaning that a close relation exists between scuffing failure and lubricant film breakdown, for a base oil tested in the FZG rig. This relation is exploited, associating the classic PV scuffing criteria with the lubricant film thickness in scuffing conditions. Correlating experimental and theoretical results, a more general PV scuffing criteria is developed which depends on the lubricant properties and lubricant temperature. The application of the new scuffing criteria to FZG-A/8.6/90 standard tests predicted the corresponding scuffing loads with excellent accuracy.
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