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US 9,469,825 B2Granted
Lubricant composition for automatic transmissions
AssigneeAfton Chemical Corporation
InventorTom Hong-Zhi Tang
Life of this patent
Estimating the term…
Abstract
A transmission lubricant composition, a method of lubricating a machine part, and a transmission are provided that utilize select boronated and phosphorylated N-substituted polyisobutylene succinimide dispersants combined with metal containing detergents to achieve high friction durability and low wear rates for automatic transmissions.
Claims18
A transmission lubricant composition comprising:
- a major amount of a lubricating oil;
- 4.5 to 23 weight percent of a boronated and phosphorylated N-substituted polyisobutylene succinimide dispersant having a number average molecular weight of the polyisobutylene substituent greater than 1300 to 2300 as determined by gel permeation chromatography using polystyrene as the reference and a viscosity of the polyisobutylene at 100° C. of 2100 to 2700 cSt, a ratio of boron to phosphorus of 0.21 to 0.46, and a ratio of boron to nitrogen of 0.09 to 0.19, and an amount of boron to provide 58 to 371 ppm boron to the transmission lubricant composition;
- and
- a metal containing detergent providing metal at greater than 0 ppm and up to 281 ppm to the transmission lubricant composition and delivering a soap content of 0.02 to 0.15 weight percent to the transmission lubricant composition.
1 more element
A method of lubricating a machine part comprising supplying thereto a lubricant composition, the method comprising:
- lubricating a machine part with a lubricant composition, the lubricant composition including a mixture of
- a major amount of a lubricating oil;
- 4.5 to 23 weight percent of a boronated and phosphorylated N-substituted polyisobutylene succinimide dispersant having a number average molecular weight of the polyisobutylene substituent greater than 1300 to 2300 as determined by gel permeation chromatography using polystyrene as the reference and a viscosity of the polyisobutylene at 100° C. of 2100 to 2700 cST, a ratio of boron to phosphorus of 0.21 to 0.46, and a ratio of boron to nitrogen of 0.09 to 0.19, and an amount of boron to provide 58 to 371 ppm boron to the lubricant composition;
- and
- a metal containing detergent providing metal at greater than 0 ppm and up to 281 ppm to the lubricant composition and delivering a soap content of 0.02 to 0.15 weight percent to the lubricant composition.
2 more elements
Dependencies are inferred from the claim text.