TEST METHODS FOR DETERMINING ANTI-SHUDDER DURABILITY OF AUTOMATIC TRANSMISSION FLUIDS 2007-01-1974
Anti-shudder characteristics are an important part of automatic transmission fluid (ATF) performance. Anti-shudder performance has two aspects, initial friction aimed at the prevention of “green shudder” and anti-shudder durability which is the prevention of shudder at high vehicle mileage. Different methods of measuring anti-shudder durability give different results. We have found that some fluids give very acceptable performance when measured in a Low Velocity Friction Apparatus (LVFA) test, such as a JASO M349-2001 [1] , do not give good results when measured in a method that includes high energy engagements and oxidation. This apparent anomaly in test results is due to unexpected behavior of certain fluids after oxidation. The observation is a cause for concern relative to the widely accepted JASO method.
Citation: Noles, J., Watts, R., Ishikawa, M., and Saito, H., "TEST METHODS FOR DETERMINING ANTI-SHUDDER DURABILITY OF AUTOMATIC TRANSMISSION FLUIDS," SAE Technical Paper 2007-01-1974, 2007, https://doi.org/10.4271/2007-01-1974. Download Citation
Author(s):
Joe Noles, Raymond F. Watts, Masahiro Ishikawa, Hirokazu Saito
Affiliated:
Infineum USA LP, 1900 East Linden Avenue, Linden, New Jersey 07036, USA
Pages: 4
Event:
JSAE/SAE International Fuels & Lubricants Meeting
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Automatic transmissions
Transmission fluids
Test procedures
Durability
Corrosion
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