C - Chemistry – Metallurgy – 10 – M
Patent
C - Chemistry, Metallurgy
10
M
253/136
C10M 133/06 (2006.01)
Patent
CA 1301736
SHIFT-FEEL DURABILITY ENHANCEMENT Abstract of the Disclosure Improved durability of shift-feel frictional charac- teristics in automotive transmission fluids is achieved by use of an initially substantially inert (friction-wise) compound -- viz., an aliphatic tertiary amine having one long chain and two short chain groups -- incorporated into a formulation which is otherwise balanced for initially good shift-feel frictional properties. When the fluid is subjected to the oxidative and thermal degradation condi- tions encountered under normal service conditions, the friction modifiers that give the fluid good initial shift-feel frictional properties degrade. However, as this occurs the aliphatic tertiary amine has itself been transformed by a mechanism that activates it so that in its new form it acquires the ability to provide good shift-feel properties. Thus this additive serves as a time-activated or delayed action substitute for the friction modifiers that have been degraded during service. The result is a continuation of good shift-feel performance over a long period of severe operation. In one embodiment of the invention, oil-soluble aliphatic diamines are used as the primary (i.e., initially effective) friction-reducing additives with which the delayed action tertiary amines are used. In another embodiment, the primary (i.e., initially effective) friction-reducing additives with which the delayed action tertiary amines are used are oil-soluble N-substituted dialkanolamines.
585609
Ethyl Petroleum Additives Inc.
Macrae & Co.
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