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.
Friction and Stick-Slip Durability Testing of ATF
Sae Technical Papers
International Fuels & Lubricants Meeting & Exposition ; 1994
01.10.1994
Aufsatz (Konferenz)
Englisch
Friction and stick-slip durability testing of ATF
Tema Archiv | 1994
|Friction and Stick-Slip Durability Testing of ATF
British Library Conference Proceedings | 1994
|Study of Stick-Slip Friction between Plunging Driveline
British Library Conference Proceedings | 2015
|Study of Stick-Slip Friction between Plunging Driveline
SAE Technical Papers | 2015
|Modelling Friction Stick-Slip in Heavy Haul Draft Gears
TIBKAT | 2022
|