Composition and method for lubricating automotive gears, axles and bearings
AssigneeThe Lubrizol Corporation
InventorsWilliam R. S. Barton, Brian B. Filippini
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Abstract
The disclosed technology relates to a lubricant composition for automotive gears, axles and bearings, the lubricant composition containing an oil of lubricating viscosity and a metal thiophosphate compound, such as zinc dialkyldithiophosphate, as well as a method of obtaining extreme pressure performance in automotive gears, axles and bearings at lower sulfur content than is typical, by lubricating such automotive gears, axles and bearings with a lubricant composition containing a metal thiophosphate compound, such as zinc dialkyldithiophosphate.
Claims14
A lubricant composition for an automotive gear comprising
- a. an oil of lubricating viscosity;
- b. a zinc thiophosphate to provide from 150 ppm to 3000 ppm zinc, and
- c. a non-metal phosphorus containing compound, wherein the non-metal phosphorus containing compound comprises at least one of a phosphorus amine salt, a sulfur containing phosphorus amine salt, a phosphite, a phosphonate, a sulfur containing phosphite, a sulfur containing phosphonate, non-metal dithiophosphates, or mixtures thereof,
- d. between 0.07 and 0.5 wt. % of a thiadiazole or derivative thereof, and
- e. a sulfurized olefin between 2 and 3 wt. %,
- wherein the lubricant comprises a total sulfur level from all additives (i.e., not including base oil) of about 0.5 to about 2 wt % and a total phosphorus level of about 500 ppm to about 1500 ppm.
Dependencies are inferred from the claim text.