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Abstract

The invention provides a grease composition containing a base oil, a thickener and an additive, characterized in that the base oil has a kinetic viscosity at 40° C. of 50 to 200 mm²/s; the thickener contains a diurea compound represented by formula (I): R¹—NHCONH—R²—NHCONH—R³ (wherein R² is a divalent aromatic hydrocarbon group having 6 to 15 carbon atoms, and R¹ and R³, which may be the same or different, represent cyclohexyl group or a straight-chain or branched alkyl group having 8 to 22 carbon atoms); and the additive is at least one selected from the group consisting of a metal salt of naphthenic acid, a salt of a fatty acid having 6 to 10 carbon atoms and an aliphatic amine having 6 to 10 carbon atoms, and a metal salt of an organic sulfonic acid. The composition of the invention shows excellent anti-fretting properties under the conditions of ordinary temperature to low temperature (e.g., −50° C., preferably about −40° C.).

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First Claim