Patent ID: 9012386
Filing Date: 2015-04-21
Classification: C10M,C10N,F16C

Abstract:
1. A grease composition for a hub unit bearing employing an angular contact ball bearing, comprising: (a) as a thickener a mixture of diurea compounds represented by formulas (I), (II) and (III): wherein R the molar ratio of the cyclohexyl groups with respect to the total number of moles of the cyclohexyl groups and straight-chain or branched alkyl groups having 18 carbon atoms being 85 to 95 % in the thickener; (b) a base oil selected from the group consisting of a mineral oil, a synthetic hydrocarbon oil and a mixture thereof; (c) a molybdenum dialkyldithiocarbamate; (d) a calcium sulfonate; and (e) an antioxidant selected from the group consisting of antioxidants having at least one functional group selected from amine functional groups, phenol functional groups, and quinoline functional groups, wherein the base oil has a kinetic viscosity of 70 to 400 mm wherein the thickener (a) is contained in an amount of 3 to 20 mass % based on the total mass of the grease composition, wherein the molybdenum dialkyldithiocarbamate (c) is contained in an amount of 1 to 5 mass % based on the total mass of the composition, and wherein the calcium sulfonate (d) is contained in an amount of 1 to 5 mass % based on the total mass of the composition.