GLE-10 INVESTIGATION OF FATIGUE LIFE OF LUBRICATING OIL ADDITIVES USING RADIAL NEEDLE BEARING TEST(GEAR LUBRICATION AND EFFICIENCY)

概要

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The Gear oils and automatic transmission fluids (ATFs) for passenger cars are required to have lower viscosity in order to achieve better fuel economy. In general, when the viscosity of lubricant is reduced, the pitting life of the bearing tends to decrease. In this study, the effect of lubricating oil additive on the pitting life was determined by the radial needle bearing pitting test machine that assumed the needle bearing in the planetary sun gear was produced. Three kinds of and-wear additive were selected, and the individual effect of each additive and the combined effect of two kinds of additives were evaluated. The chemical composition of the additive film formed on the rolling contact surface was analyzed by XPS, and the hardness of the film was measured using a nano-indenter. It is understood that the combination of phosphorus and sulfur additives gives the longest pitting life of all tested samples, and that the additive that forms a softer film on the rolling surface tends to extend the pitting life.
一般社団法人日本機械学会の論文
2009-05-13