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Friction Characteristics of DEXRON®-III Automatic Transmission Fluids
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Abstract
The friction characteristics of several DEXRON®-III automatic transmission fluids were examined in a variety of friction tests. These evaluations included tests with SAE No. 2 Friction Machines using either Band or Plate heads, breakaway friction tests, and low-sliding speed friction tests. The effect of bulk fluid temperature on friction performance was examined in band tests and in breakaway tests using the plate clutch apparatus. The DEXRON®-III fluids were compared to the previous generation automatic transmission fluids. Results showed that the DEXRON®-III fluids exhibited more desirable friction characteristics; for example, with the DEXRON®-III fluids in the band machine, dynamic friction remained stable during sustained operation at high temperature, whereas with DEXRON®-IIE fluids, dynamic friction decreased as much as 25%. Band tests and breakaway friction tests at various temperatures showed fluid friction characteristics and durability to be sensitive to bulk fluid temperature, but with the DEXRON®-III fluid being less sensitive than the DEXRON®-IIE fluid.
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Authors
Citation
Linden, J., Stebar, R., and Kemp, S., "Friction Characteristics of DEXRON®-III Automatic Transmission Fluids," SAE Technical Paper 941887, 1994, https://doi.org/10.4271/941887.Also In
References
- DEXRON®-III Automatic Transmission Fluid Specification April 1993
- DEXRON®-IIE Automatic Transmission Fluid Specification August 1992
- Kemp S. Linden J. “The Oxidation Stability of General Motors Proposed Factory-Fill Automatic Transmission Fluid” SAE Paper No. 922371 October 1992
- MERCON® Automatic Transmission Fluid Specification Ford Motor Company September 1992
- Stebar R.F. Davison E. D. Linden J. L. “Determining Frictional Performance of Automatic Transmission Fluids in a Band Clutch” SAE Paper No. 902146 October 1990
- Smith G. Ross W. Silbert P. Herndon W. “Putting Automatic Transmission Clutch Friction Researchers on Speaking Terms” SAE Paper No. 670051
- C-4 Heavy Duty Automatic Transmission Fluid Specification Allison Transmission Division, General Motors Corporation May 1989
- SAE Publication J-1646 “Glossary of Terms -Lubricated Friction Systems” SAE Warrendale, PA March 1994