Grease composition for automobile wheel bearing
AssigneesNtn Corporation, Kyodo Yushi Co., Ltd.
InventorsKazunori KUBOTA, Makoto OISHI
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Abstract
The present invention provides a grease composition for automobile wheel bearings, which contains (a) an urea thickener represented by general formula (1); R1—NHCONH—R2—NHCONH—R3 (wherein R1 and R3 may be the same or different from each other and are each independently an aromatic hydrocarbon group having 6 to 12 carbon atoms, and R2 represents an aromatic hydrocarbon group having 6 to 15 carbon atoms); (b) an organic molybdenum compound; and (c) a base oil. The composition of the present invention can extend the flaking life and lubrication life, and reduce the fretting wear.
Claims9
A tapered roller bearing for an automobile wheel, wherein a grease composition comprising the following (a) to (c) is packed:
- (a) an urea thickener represented by general formula (1):
- R1—NHCONH—R2—NHCONH—R3 (1)
- wherein R1 and R3 may be the same or different from each other and each independently represents an aromatic hydrocarbon group having 6 to 12 carbon atoms, and R2 represents an aromatic hydrocarbon group having 6 to 15 carbon atoms;
- (b) 1 to 5% by mass of a molybdenum dithiocarbamate;
- and
- (c) as a base oil, a mixture comprising 20 to 50% of a synthetic hydrocarbon oil and 80 to 50% of a mineral oil.
(canceled)
-9. (canceled)
A tapered roller bearing for an automobile wheel, wherein a grease composition comprising the following (a) to (c) is packed:
- (a) an urea thickener represented by formula (1-1) or (1-2) in an amount of 10 to 25% by mass with respect to the total mass of the composition;
- (b) a molybdenum dithiocarbamate in an amount of 1 to 5% by mass with respect to the total mass of the composition;
- and
- (c) a mixed base oil consisting of 60% of a mineral oil and 40% of a synthetic hydrocarbon oil.
Dependencies are inferred from the claim text.