Friction and Stick-Slip Durability Testing of ATF

941883

10/01/1994

Event
International Fuels & Lubricants Meeting & Exposition
Authors Abstract
Content
Recent commercial specification revisions for automatic transmission fluids (ATFs) have focused upon more stringent friction requirements. More stringent friction durability characteristics are assessed using the SAE No. 2 tester. The commercial specifications do not include provisions to evaluate low speed friction characteristics, which have been shown to relate to torque converter shudder.
This paper focuses upon effective use of the Falex 6 Multispecimen Tester to evaluate friction durability and to evaluate low speed friction characteristics in conjunction with low speed friction apparatus (LVFA) testing. Falex 6 testing agreed with torque fade observed in SAE No. 2 tests. Low speed stick-slip durability characteristics were effectively differentiated for a number of field ATFs. Falex 6 testing coupled with LVFA testing was shown to correlate with field experience and other test methods related to torque converter shudder. Finally, a Variable Speed Friction Tester (VSFT) was developed to improve test method continuity and improve test quality.
Meta TagsDetails
DOI
https://doi.org/10.4271/941883
Pages
22
Citation
Ward, W., Sumiejski, J., Castanien, C., Tagliamonte, T. et al., "Friction and Stick-Slip Durability Testing of ATF," SAE Technical Paper 941883, 1994, https://doi.org/10.4271/941883.
Additional Details
Publisher
Published
Oct 1, 1994
Product Code
941883
Content Type
Technical Paper
Language
English