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AssigneeNtn Corporation
InventorsHidenobu Mikami, Yosuke Taguchi, Takayuki Kawamura
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The present invention provides a grease composition or a lubricating oil composition which is capable of effectively preventing hydrogen brittleness-caused peeling from occurring on a rolling surface of a rolling bearing, is excellent in durability in a high temperature and speed operation, and can be used for a long time. A grease-packed bearing (1) has an inner ring (2), an outer ring (3), and a plurality of rolling elements (4). A sealing member (6) for sealing a grease composition (7) is provided at openings (8a) and (8b) disposed at both axial ends of the inner ring (2) and the outer ring (3). The grease composition (7) includes a base grease composed of a base oil and a thickener and an additive added to the base grease. The additive contains at least one compound selected from among plant-derived polyphenolic compounds and compounds formed by decomposition thereof. The above-described compounds include tannin, gallic acid, ellagic acid, chlorogenic acid, caffeic acid, curcumin, quercetin, and quinic acid.
A grease composition comprising a base grease composed of a base oil and a thickener, and an additive added to said base grease, wherein a kinematic viscosity of said base oil is 10 to 100 mm2/second at 40° C., wherein said additive comprises at least one compound selected from the group consisting of ellagic acid, a derivative of ellagic acid, caffeic acid, curcumin, a derivative of curcumin, quercetin, and a derivative of quercetin which are plant-derived polyphenolic compounds and quinic acid which is a compound formed by decomposition of a plant derived polyphenolic compound.
A grease composition comprising a base grease composed of a base oil and a thickener, and an additive added to said base grease, wherein said thickener is a urea-based compound, wherein said additive comprises at least one compound selected from the group consisting of ellagic acid, a derivative of ellagic acid, caffeic acid, curcumin, a derivative of curcumin, quercetin, and a derivative of quercetin which are plant-derived polyphenolic compounds and quinic acid which is a compound formed by decomposition of a plant derived polyphenolic compound.
A grease composition comprising a base grease composed of a base oil and a thickener, and an additive added to said base grease, wherein said thickener is a metal soap, wherein said additive comprises at least one compound selected from the group consisting of ellagic acid, a derivative of ellagic acid, caffeic acid, curcumin, a derivative of curcumin, quercetin, and a derivative of quercetin which are plant-derived polyphenolic compounds and quinic acid which is a compound formed by decomposition of a plant derived polyphenolic compound.
A grease composition comprising a base grease composed of a base oil and a thickener, and an additive added to said base grease,
A grease composition comprising a base grease composed of a base oil and a thickener, and an additive added to said base grease, wherein said base oil is perfluoropolyether oil;
Dependencies are inferred from the claim text.