Abstract
Rolling and sliding friction effects in the two more important regimes of the lubrication of gears, the mixed and elastohydrodynamic (EHD) regimes, are reviewed in order to extract useful equations for the traction (friction) coefficient. A brief résumé is given of the theoretical background in the more important situations. In line with questioning the application of lubrication theories (based on disc machine tests) to gears, the correlation of disc and gear tests is discussed. The testing of actual gears is examined, particularly the aspects which would enable the lubrication theories to be tested. It is concluded that values of the coefficient of friction can be predicted reasonably accurately in the EHD regime and that useful estimates can be made in the mixed regime.
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