GREASE COMPOSITION AND GREASE-FILLED WHEEL BEARING

摘要

Provided is a grease composition for a wheel bearing, containing (a) a base oil consisting of a mineral oil and a synthetic hydrocarbon oil, wherein the ratio of the synthetic hydrocarbon oil to the total amount of the mineral oil and the synthetic hydrocarbon oil is 40 to 60 mass %, and the base oil has a kinematic viscosity at 40° C. of 40 to 65 mm2/s; (b) a thickener of formula (A) wherein R2 is diphenylmethane, and R1 and R3, which may be the same or different from each other, each represent cyclohexyl group or a straight-chain or branched alkyl group having 16 to 20 carbon atoms, with a molar ratio of the cyclohexyl group to the total number of moles of the cyclohexyl group and the alkyl group being 50 to 90 mol %; (c) an amine type antioxidant; and (d) an amine phosphate type antiwear agent.;

主权项

1. A grease composition for a wheel bearing, comprising;
(a) a base oil consisting of a mineral oil and a synthetic hydrocarbon oil, wherein a ratio of the synthetic hydrocarbon oil to a total amount of the mineral oil and the synthetic hydrocarbon oil is 40 to 60 mass %, and the base oil has a kinematic viscosity at 40° C. of 40 to 65 mm2/s; (b) a thickener represented by formula (A): wherein R2 is diphenylmethane; and R1 and R3, which may be the same or different from each other, each represents cyclohexyl group or a straight-chain or branched alkyl group having 16 to 20 carbon atoms, with a molar ratio of the cyclohexyl group to the total number of moles of the cyclohexyl group and the alkyl group, expressed by [((the number of cyclohexyl groups)/(the number of cyclohexyl groups+the number of alkyl groups))×100] being 50 to 90 mol %; (c) an amine type antioxidant; and (d) an amine phosphate type antiwear agent.