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Automatic Transmission Fluid Development: Reaching New Levels of Friction Durability
ISSN: 0148-7191, e-ISSN: 2688-3627
Published July 23, 2007 by SAE International in United States
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This paper reports development of a new automatic transmission (AT) fluid (ATF) with enhanced durability for the Asian marketplace. The authors contend the new step-automatic transmission hardware, such as wet starting clutches, new friction materials, dual clutches and six- and seven-speed ATs, create the need for enhanced levels of friction durability from the ATF. The new challenge from such hardware for the fluid developer lies in simultaneously meeting more stringent wear, extreme pressure (EP), friction durability and torque capacity requirements.
The new additive chemistry, when used in a mineral oil base fluid, is capable of 1000+ hours in JASO M349 LVFA durability testing, a 16-fold increase over the JASO M349 reference ATF Toyota T-III. This performance easily doubles that of the currently most durable Asian ATFs, while offering better anti-wear and EP performance.
- Mark S. Jones - R&D Laboratory, Afton Chemical, Ltd., Bracknell, Berkshire, United Kingdom
- Kenji Yatsunami - R&D Laboratory, Afton Chemical Japan Corp., Tsukuba, Japan
- Samuel H. Tersigni - R&D Laboratory, Afton Chemical, Inc., Richmond, Virginia, USA
- Lee D. Saathoff - R&D Laboratory, Afton Chemical, Inc., Richmond, Virginia, USA
- Christopher Cleveland - R&D Laboratory, Afton Chemical, Inc., Richmond, Virginia, USA
CitationTersigni, S., Saathoff, L., Cleveland, C., Jones, M. et al., "Automatic Transmission Fluid Development: Reaching New Levels of Friction Durability," SAE Technical Paper 2007-01-1986, 2007, https://doi.org/10.4271/2007-01-1986.
- General Motors DEXRON® VI ATF service-fill specification
- Box, G. Hunter, W. Hunter, J. Statistics for Experimenters Wiley & Sons 1975 New York, New York
- Nixon H. SAE paper 840213 Film Thickness Effects on Bearing Life
- A note on fluid terminology: an ATF contains at least a performance additive (a multi-component chemical mixture) and a base fluid, which may be mineral or synthetic. Optionally, the ATF may also contain viscosity index improvers (thickeners), seal swell agents and pour point depressants, usually not considered part of the performance additive system because their use is mainly dependent upon base fluid choice
- ASTM D2783
- ASTM D2266