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US 11,702,613 B2Granted
Grease composition for ball joint
AssigneeKyodo Yushi Co., Ltd.
InventorsTsuyoshi Kochi, Mitsuhiro Kakizaki, Yosuke Fujiwara, Tomohiro Monna
Life of this patent
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Abstract
Provided is a grease composition for a ball joint that can reduce the wear of a ball seat at a slide region and also has excellent compatibility with a dust cover. The grease composition for a ball joint comprises a base oil, a thickener, and an additive. The base oil contains an ethylene-α-olefin copolymer and the kinetic viscosity of the base oil at 40° C. is 2,000 to 6,000 mm2/s. The additive contains a polar wax (e.g., monoamide wax or ester wax).
Claims6
A grease composition for a ball joint comprising:
- a base oil;
- a thickener;
- and
- an additive,
- wherein the base oil is a combination of an ethylene-α-olefin copolymer having a kinetic viscosity at 40° C. of 7,000 to 15,000 mm2/s and poly-α-olefin having a kinetic viscosity at 40° C. of 19 to 50 mm2/s, the base oil has a kinetic viscosity at 40° C. of 2,200 to 5,400 mm2/5, and a content of the ethylene-α-olefin copolymer is 70% by mass or more and 90% by mass or less based on a total amount of the base oil,
- the additive contains as a polar wax hydrogenated castor oil,
- the thickener contains a Li soap,
- a content of the base oil is 80 to 95% by mass based on a total amount of the grease composition,
- a content of the thickener is 1 to 5% by mass based on the total amount of the grease composition,
- a content of the polar wax is 1 to 10% by mass based on the total amount of the grease composition, and
- a content of additive except for the polar wax is 18% by mass or less based on the total amount of the grease composition.
8 more elements
Dependencies are inferred from the claim text.