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The purpose of this study is to clarify the influence of lubricating conditions, such as temperature and amount of oil supplied, viscosity grade, and chemical composition of base stock, on the tooth surface strength of carburized gears. Experiments were carried out to measure the tooth surface strength and the tooth surface temperature during operation by changing the lubricating conditions. The results obtained were discussed on the basis of EHL film thickness calculated with consideration for measured tooth surface temperature. It was found that tooth surface strength under various lubricating conditions was describable using a new parameter PHmean λ-0.3 which is composed of the Hertzian pressure PHmean and the specific film thickness λ. An empirical formula that quantitatively expressed changes in the tooth surface strength under the various conditions was obtained.

nihon kikai gakkai ronbunshū. c

Evaluation of Tooth Surface Strength of Transmission Gears Based on EHL Film Thickness Calculated with consideration for Tooth Surface Temperature(Influence of Temperature and Amount of Supplied Lubricating Oil, Viscosity Grade, and Synthetic Base Stock)