| abstract |
The present invention provides a grease composition that can be suitably used particularly for wheel bearings of automobiles and the like used under high speed and high temperature conditions. A grease composition comprising a base oil and a thickener, wherein the base oil contains at least one of mineral oil and synthetic oil, and the thickener is a composite lithium soap with respect to the total amount of grease. 2 to 20 mass% and a polyurea compound represented by the following formula (1) 0.5 to 10 mass%, and the blend ratio of the composite lithium soap and the polyurea compound is 9.5 by mass ratio. : 0.5-5: 5, and a grease composition characterized by having a penetration of 130-340. R 1 —NH— (CONH—R 2 —NHCONH—R 3 NH) y—CONH—R 2 —NHCONH—R 4 (1) (in the formula (1), y is an integer of 0 to 3, R 1 , R 2 , R 3 and R 4 are each independently a hydrocarbon group having 1 to 30 carbon atoms.) [Selection figure] None |