Patent ID: 8329623

Claim:
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.