Automatic transmission fluid

Abstract

An automatic transmission fluid contains: a base oil: a component (A) that is two or more succinimides each having an alkenyl group or an alkyl group, wherein a mass average molecular weight of the alkenyl group or the alkyl group is different in each of the succinimides; a component (B) that is a primary amine having a carbon chain having 12 to 24 carbon atoms; a component (C) that is an aliphatic amine alkylene oxide adduct having a carbon chain having 12 to 20 carbon atoms; and a component (D) that is an amide compound.

1 : An automatic transmission fluid, comprising:
 a base oil;   a component (A) comprising two or more succinimides each having an alkenyl group or an alkyl group, wherein a mass average molecular weight of the alkenyl group or the alkyl group is different in each of the succinimides;   a component (B) comprising a primary amine having a carbon chain having 12 to 24 carbon atoms;   a component (C) comprising an aliphatic amine alkylene oxide adduct having a carbon chain having 12 to 20 carbon atoms; and   a component (D) comprising an amide compound.   
     
     
         2 : The automatic transmission fluid according to  claim 1 , wherein the two or more succinimides are mono-succinimides. 
     
     
         3 : The automatic transmission fluid according to  claim 1 , wherein the mass average molecular weight of the alkenyl group or the alkyl group ranges from 800 to 1500. 
     
     
         4 : The automatic transmission fluid according to  claim 3 , wherein the component (A) comprises:
 a mono-succinimide (A1) having an alkenyl group or an alkyl group having a mass average molecular weight in a range from 1200 to 1500; and   a mono-succinimide (A2) having an alkenyl group or an alkyl group having a mass average molecular weight in a range from 800 to less than 1200.   
     
     
         5 : The automatic transmission fluid according to  claim 4 , wherein a blending ratio of the component (A1) ranges from 50 mass % to 80 mass % based on a total amount of the components (A1) and (A2). 
     
     
         6 : The automatic transmission fluid according to  claim 1 , wherein a content of the component (A) range from 4.5 mass % to 6 mass % based on a total amount of the automatic transmission fluid. 
     
     
         7 : The automatic transmission fluid according to  claim 1 , wherein a content of the component (B) ranges from 24 mass ppm to 235 mass ppm in terms of a nitrogen amount based on a total amount of the automatic transmission fluid. 
     
     
         8 : The automatic transmission fluid according to  claim 1 , wherein a content of the component (C) ranges from 10 mass ppm to 320 mass ppm in terms of a nitrogen amount based on a total amount ofthe automatic transmission fluid. 
     
     
         9 : The automatic transmission fluid according to  claim 1 , wherein a content of the component (D) ranges from 62 mass ppm to 310 mass ppm in terms of a nitrogen amount based on a total amount of the automatic transmission fluid.