Grease composition and grease-sealed bearing
AssigneeNtn Corporation
InventorTakayuki Kawamura
Life of this patent
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Abstract
The present invention provides a grease composition (7) which has a low friction and a low viscosity and is durable at a high temperature and a grease-sealed bearing (1) in which the grease composition is enclosed. The grease composition contains base oil, a thickener, and an additive. The base oil contains an ionic liquid consisting of a cation component and an anion component. The additive contains a corrosion inhibitor such as nitrites, molybdates or dibasic acid salts. The thickener is fluorine resin such as polytetrafluoroethylene. The grease composition (7) is applied to a periphery of each rolling element (4) of the grease-sealed bearing (1).
Claims3
A grease-sealed bearing in which a grease composition is enclosed;
- said grease composition being a grease composition for a bearing comprising a bearing steel comprising a base oil, a thickener, and an additive, wherein said base oil contains an ionic liquid consisting of a cation component and an anion component;
- said cation component of said ionic liquid is imidazolium and said anion component thereof is a bis-trifluoromethylsulfonyl imide anion or a tri(pentafluoroethyl)-trifluorophosphide anion;
- said thickener contains polytetrafluoroethylene resin;
- said additive contains a corrosion inhibitor containing sodium sebacate and a mixing amount of said sodium sebacate is 5 to 15 wt % for a total of an amount of said base oil and an amount of said thickener wherein a mixing ratio of said ionic liquid is not less than 50 wt % for an entirety of said base oil.
Dependencies are inferred from the claim text.