| abstract |
Urea-based lubricating grease compositions comprising:n n n (a) a diurea compound, which is an alkyldiurea compound having an average molecular weight in the range of 600 to 700, as a thickener, wherein the range of 25 to 60 mol% of the total alkyl groups is an unsaturated component and the total amine of the primary amine constituting the raw material Value is in the range of 250 to 350),n n n (b) a base oil having as its main component one or more synthetic hydrocarbon oil (s) having a pour point of -40 ° C. or less, wherein the dynamic viscosity of the base oil is no greater than 6000 mm 2 / sec at -40 ° C., andn n n (c) a mixture comprising an oil-soluble organic molybdenum complex, an oil-soluble organic zinc compound of dithiocarbamic acid, an oil-soluble organic zinc compound of dithiophosphoric acid, and an inorganic sulfur compound; Andn n n The roller bearing and power steering apparatus in which said urea-based lubricating grease composition is used as a lubricant. |