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Low Friction and Low Viscosity Final Drive Oil
- Mona Ariyama - JXTG Nippon Oil & Energy Corporation ,
- Hitoshi Komatsubara - JXTG Nippon Oil & Energy Corporation ,
- Tomoo Kubo - Nissan Motor Co., Ltd. ,
- Naoto Akie - Nissan Motor Co., Ltd. ,
- Yuji Okamoto - Nissan Motor Co., Ltd. ,
- Sachiko Okuda - Nissan Motor Co., Ltd. ,
- Takumaru Sagawa - Nissan Motor Co., Ltd.
ISSN: 2641-9637, e-ISSN: 2641-9645
Published December 19, 2019 by SAE International in United States
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, https://doi.org/10.4271/2019-01-2336.
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.