	US 11,732,208 B2
	Composition and method for lubricating automotive gears, axles and bearings
William R. S. Barton, Belper (GB); and Brian B. Filippini, University Heights, OH (US)
Assigned to The Lubrizol Corporation
Appl. No. 17/265,242
Filed by The Lubrizol Corporation, Wickliffe, OH (US)
PCT Filed Aug. 1, 2019, PCT No. PCT/US2019/044660 § 371(c)(1), (2) Date Feb. 2, 2021, PCT Pub. No. WO2020/033232, PCT Pub. Date Feb. 13, 2020.
Claims priority of provisional application 62/715,041, filed on Aug. 6, 2018.
Prior Publication US 2021/0222082 A1, Jul. 22, 2021
Int. Cl. C10M 137/10 (2006.01); C10M 135/36 (2006.01); C10M 137/08 (2006.01); C10M 169/04 (2006.01); C10N 30/00 (2006.01); C10N 10/14 (2006.01); C10N 20/02 (2006.01); C10N 30/04 (2006.01); C10N 30/06 (2006.01); C10N 40/02 (2006.01); C10N 40/04 (2006.01)

CPC C10M 137/10 (2013.01) [C10M 135/36 (2013.01); C10M 137/08 (2013.01); C10M 169/04 (2013.01); C10M 2219/106 (2013.01); C10M 2223/043 (2013.01); C10M 2223/045 (2013.01); C10N 2010/14 (2013.01); C10N 2020/02 (2013.01); C10N 2030/04 (2013.01); C10N 2030/06 (2013.01); C10N 2030/43 (2020.05); C10N 2040/02 (2013.01); C10N 2040/04 (2013.01)]

12 Claims

1. A lubricant composition for an automotive gear comprising

a. an oil of lubricating viscosity;

b. a zinc thiophosphate to provide from 100 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 1500 ppm to about 4000 ppm.