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Super Low Viscosity ATF; AW-2
Technical Paper
2018-01-1756
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Reducing loss torque in automatic transmissions (ATs) is a key factor in improving fuel economy. A promising approach is to reduce the viscosity of the Automatic Transmission Fluid (ATF) so as to minimize churning loss. Aisin AW and JXTG Nippon Oil & Energy Corporation have developed a super low viscosity ATF, called “AW-2”, which has approximately 50% lower kinematic viscosity at 40 °C compared to the conventional ATF “AW-1”. It is generally understood that if the viscosity of an ATF is too low, it can have a negative impact on the fatigue life of components such as gears and bearings, and possibly lead to increased wear or seizure. AW-2 was designed to solve these problems via the application of two key technologies. The first is a high performance base oil with a low traction coefficient, which translates to low viscosity under high pressure conditions. This decreases the shear resistance between sliding surfaces under elastohydrodynamic lubrication (EHL) conditions, which contributes in improving the fatigue life of bearings and other components. The second is an ester type base oil with high polarity. It was found that the amount of ester base oil used has a major influence on fatigue life. The adsorption of esters onto metal surfaces is thought to improve lubricity in severe lubrication conditions. Durability tests were performed in a wide range of conditions, using gear and bearing components and actual transmission units, and it was confirmed that AW-2 outperforms AW-1, despite its super low viscosity. Furthermore, AW-2 reduced loss torque in the transmission by approximately 10% compared to AW-1.
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Authors
- Kohei Masuda - JXTG Nippon Oil & Energy Corp.
- Hajime Nakao - JXTG Nippon Oil & Energy Corp.
- Hitoshi Komatsubara - JXTG Nippon Oil & Energy Corp.
- Osamu Kurosawa - JXTG Nippon Oil & Energy Corp.
- Katsuhito Yamada - Aisin AW Co.,Ltd.
- Kazunori Ishikawa - Aisin AW Co.,Ltd.
- Atsushi Mori - Aisin AW Co.,Ltd.
Topic
Citation
Masuda, K., Nakao, H., Komatsubara, H., Kurosawa, O. et al., "Super Low Viscosity ATF; AW-2," SAE Technical Paper 2018-01-1756, 2018, https://doi.org/10.4271/2018-01-1756.Data Sets - Support Documents
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References
- Sasaki , T. , Ohmori , I. , Furumoto , M. , Tanaka , H. et al. Development of Automotive Lubricants Based on High-Viscosity Index Base Stock SAE Technical Paper 951028 1995 10.4271/951028
- Kurosawa , O. , Matsui , S. , Komiya , K. , Morita , E. et al. Development of the Fuel Saving Low Viscosity ATF SAE Technical Paper 2003-01-3257 2003 10.4271/2003-01-3257
- Yamamori , K. , Saitou , K. , Kobiki , Y. , and Ogawa , A. Development of New Automatic Transmission Fluid for Fuel Economy SAE Technical Paper 2003-01-3258 2003 10.4271/2003-01-3258
- Kurihara , I. and Kurosawa , O. Design and Performance of Low-Viscosity ATF SAE Technical Paper 2007-01-3974 2007 10.4271/2007-01-3974
- Yamamori , K. , Saito , K. , and Yoneda , T. Development of New Manual Transmission Gear Oil for Fuel Economy SAE Technical Paper 2005-01-2182 2005 10.4271/2005-01-2182
- Kurashina , H. , Ito , Y. , Isomura , H. , and Yamaguchi , K. A Study of Transmission Fluid Performance on Fuel Economy SAE Technical Paper 2007-01-1980 2007 10.4271/2007-01-1980
- Fukumizu , T. , Yamashita , M. , Ogawa , M. , Nishinosono , J. et al. Development of Continuously Variable Transmission Fluid for Fuel Economy SAE Technical Paper 2013-01-2584 2013 10.4271/2013-01-2584
- Ito , M. , Kurosawa , O. , and Matsuoka , T. The Evaluation of the Fuel-Economy Performance of Low-Viscosity Drive-Train Lubricants and the Development of Oils with Improved Fatigue Life SAE Technical Paper 2004-01-3029 2004 10.4271/2004-01-3029
- Hata , H. Molecular Structure of Traction Oils and Their Traction Characteristics Journal of the Japan Society for Precision Engineering 56 9 1589 1990