Methods for improved power transmission performance and lubricating compositions therefor

摘要

Advanced methods are provided for achieving improved power transmission performance, and unique fluid compositions useful for practicing such methods are also presented. In particular a method and related composition is provided for reducing NVH in a power transmission apparatus having a friction torque transfer apparatus, such as, e.g., a shifting clutch, comprising maintaining a negative ∂µ/∂T slope, and/or a negative ∂µ/∂P slope, during engagement of the friction torque transfer apparatus. The composition comprises a minor amount of an additive composition including alkoxylated amine, dihydrocarbyl phosphite, metallic detergent and phosphorylated succinimide.