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Low Friction and Low Viscosity Final Drive Oil

Journal Article
ISSN: 2641-9637, e-ISSN: 2641-9645
Published December 19, 2019 by SAE International in United States
Low Friction and Low Viscosity Final Drive Oil
Citation: Kubo, T., Akie, N., Okamoto, Y., Okuda, S. et al., "Low Friction and Low Viscosity Final Drive Oil," SAE Int. J. Adv. & Curr. Prac. in Mobility 2(1):466-471, 2020,
Language: English


The new lubricant was newly developed for differential gear unit to contribute to all friction factors/conditions (Boundary, Hydrodynamic & those Mixed Lubrication) even if the differential gear is operating under very severe conditions such as high-gear-contact pressure and highly sliding speed. The main concept of development was selecting and formulating the optimized additives for severe lubrication conditions in order to achieve the best balance between thinner-film thickness and extreme pressure performance. In conclusion, by the application of both synthetic base oil instead of mineral one and activation technology of MoDTC in spite of ZnDTP free formulation, it is finally realized to reduce the torque of final drive unit by 40% and it can be estimated the 0.5% of CO2 reduction in actual vehicles.