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US 5,840,663 AGranted
Power transmitting fluids improved anti-shudder durability
AssigneeExxon Chemical Patents Inc.
InventorsRoger K. Nibert, Manoj Tandon, Raymond F. Watts
Life of this patent
Estimating the term…
Abstract
The anti-shudder durability of power transmitting fluids, particularly automatic transmission fluids, is improved by incorporating a combination of low potency friction modifiers, alkyl phosphites, specific ashless dispersants and a corrosion inhibitor. The anti-shudder durability of these fluids may be further enhanced by inclusion of a metallic detergent.
Claims16
A power transmitting fluid composition comprising:
- (1) a major amount of a lubricating oil, and
- (2) an anti-shudder improving effective amount of an additive combination comprising:
- (a) a reaction product of an isomerized alkenyl substituted succinic anhydride and a polyamine characterized by structure (I), where structure (I) is:
- ##STR7## where:
- x and y are independent integers whose sum is from 1 to 30, and
- z is an integer from 1-10;
- or the alkyl analog thereof,
- (b) an oil-soluble alkyl phosphite;
- (c) an ashless dispersant with alkyl sidechains of greater than about 1800 molecular weight;
- and
- (d) a nitrogen containing corrosion inhibitor.
8 more elements
A power transmitting fluid composition comprising:
- (1) a major amount of a lubricating oil, and
- (2) an anti-shudder improving effective amount of an additive combination comprising:
- (a) a reaction product of an isomerized alkenyl substituted succinic anhydride and a polyamine characterized by structure (I), where structure (I) is:
- ##STR8## where:
- x and y are independent integers whose sum is from 1 to 30, and
- z is an integer from 1-10;
- or the alkyl analog thereof,
- (b) an oil-soluble alkyl phosphite;
- (c) an ashless dispersant with alkyl sidechains in the range of 1800 to 5000 molecular weight;
- and
- (d) a nitrogen containing corrosion inhibitor.
8 more elements
An additive concentrate composition comprising:
- (a) a reaction product of an isomerized alkenyl substituted succinic anhydride and a polyamine characterized by structure (I), where structure (I) is:
- ##STR9## where:
- x and y are independent integers whose sum is from 1 to 30, and
- z is an integer from 1-10;
- or the alkyl analog thereof,
- (b) an oil-soluble alkyl phosphite;
- (c) an ashless dispersant with alkyl sidechains of 1800 to 5000 molecular weight;
- and
- (d) a nitrogen containing corrosion inhibitor.
6 more elements
Dependencies are inferred from the claim text.