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US 12,606,768 B2Granted
Lubricating composition for vehicle transmissions
AssigneeAfton Chemical Corporation
InventorsArturo Carranza, Wenjun Liu, Yue Hu
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Abstract
A gear fluid composition for lubricating a driveline including a thiadiazole additive and select substituted aryl-phosphite compounds to achieve good antiwear and copper corrosion performance.
Claims12
A lubricating composition suitable for use in vehicle transmissions, the lubricating composition comprising:
- one or more base oils of lubricating viscosity;
- about 0.4 weight percent of a thiadiazole additive, wherein the thiadiazole additive comprises 2,5 dimercapto-1,3,4-thiadiazole, and wherein the 2,5 dimercapto-1,3,4-thiadiazole comprises a blend of 2,5-bis-(alkyl-dithio)-1,3,4-thiadiazole and 2,5-mono-(alkyl-dithio)-1,3,4-thiadiazole and wherein the blend includes about 10 to about 25% of the 2,5-mono-(alkyl-dithio)-1,3,4-thiadiazole;
- about 0.5 weight percent of one or more substituted tris-aryl phosphites having an overall ratio of para-position substitution to ortho-position substitution of about 1.0.
A method of lubricating a transmission comprising:
- lubricating a transmission with a lubricating composition;
- wherein the lubricating composition includes one or more base oils of lubricating viscosity, about 0.4 weight percent of a thiadiazole additive, wherein the thiadiazole additive comprises 2,5 dimercapto-1,3,4-thiadiazole, and wherein the 2,5 dimercapto-1,3,4-thiadiazole comprises a blend of 2,5-bis-(alkyl-dithio)-1,3,4-thiadiazole and 2,5-mono-(alkyl-dithio)-1,3,4-thiadiazole and wherein the blend includes about 10 to about 25% of the 2,5-mono-(alkyl-dithio)-1,3,4-thiadiazole, and about 0.5 weight percent of one or more substituted tris-aryl phosphites having an overall ratio of para-position substitution to ortho-position of about 1.0.
Dependencies are inferred from the claim text.