Effects of molybdenum disulphide and an organic molybdenum compound in gear oil on rolling contact fatigue

Abstract

Sliding-rolling contact fatigue tests with roller pairs were performed using three kinds of oils as lubricants in order to elucidate the effects of molybdenum disulphide and an organic molybdenum compound in oil on fatigue life and surface failure. A Weibull analysis was applied to pitting failure to analyse the depths and sizes of pits. These experimental and analytical results for each oil were discussed with respect to the amplitudes of the ratios of shear stresses to Vickers' hardnesses beneath the roller surfaces calculated considering friction forces and hardness distributions at elevated temperatures in service.