	US 12,467,012 B2
	Grease composition for vehicular hub unit bearings
Kazuki Isa, Fujisawa (JP); Yuki Takeyama, Shanghai (CN); Masatoshi Ijima, Fujisawa (JP); Suguru Sugawara, Fujisawa (JP); and Hiroaki Ishikawa, Fujisawa (JP)
Assigned to KYODO YUSHI CO., LTD., Kanagawa (JP); and NSK LTD., Tokyo (JP)
Appl. No. 18/689,492
Filed by KYODO YUSHI CO., LTD., Fujisawa (JP); and NSK Ltd., Tokyo (JP)
PCT Filed Sep. 13, 2022, PCT No. PCT/JP2022/034199 § 371(c)(1), (2) Date Mar. 6, 2024, PCT Pub. No. WO2023/038149, PCT Pub. Date Mar. 16, 2023.
Claims priority of application No. 2021-148638 (JP), filed on Sep. 13, 2021.
Prior Publication US 2024/0263099 A1, Aug. 8, 2024
Int. Cl. C10M 171/02 (2006.01); C10M 115/08 (2006.01); C10M 129/10 (2006.01); C10M 129/26 (2006.01); C10M 137/10 (2006.01); C10M 169/06 (2006.01); F16C 33/66 (2006.01)

CPC C10M 171/02 (2013.01) [C10M 115/08 (2013.01); C10M 129/10 (2013.01); C10M 129/26 (2013.01); C10M 137/105 (2013.01); C10M 169/06 (2013.01); F16C 33/6633 (2013.01); C10M 2207/125 (2013.01); C10M 2215/1026 (2013.01); F16C 2210/04 (2013.01); F16C 2326/02 (2013.01)]

8 Claims

1. A grease composition for vehicular hub unit bearings comprising:

a base oil;

a thickener; and

an additive,

wherein the base oil is a synthetic hydrocarbon oil having a kinematic viscosity at 40° C. of 25-50 mm²/s,

the thickener is an alicyclic aliphatic diurea compound,

the additive includes, based on a total mass of the composition, 0.2-0.4% by mass of a carboxylic acid-based corrosion inhibitor which is-contains an alkenyl succinic acid half ester, 0.3-0.4% by mass of a carboxylic acid salt-based corrosion inhibitor which comprises zinc abietate, and 0.9-1.1% by mass of an amine salt of a fatty acid wherein an amine constituting the amine salt is selected from the group consisting of octylamine, laurylamine, myristylamine, and stearylamine, and

a worked penetration is 220-270.