Grease composition for constant-velocity joints

摘要

A grease composition for constant-velocity joints which is prepared by blending a lube base oil with (A) a urea-urethane thickening agent comprising a mixture of (a) 20 to 95 mole % of a diurea compound of the formula (1): <IMAGE> (1) (b) 4 to 50 mole % of a urea-urethane compound of the formula (2): <IMAGE> (2) and (c) 1 to 50 mole % of a diurethane compound of the formula (3): <IMAGE> (3) with each mole percentage being based on the total amount of the components (a) to (c), wherein a ratio of the total number of R2-NH-, R3-NH- and R5-NH- groups contained in the mixture to the total number of R6-O-, R8-O- and R9-O- groups contained therein lies between 40:60 and 95:5, (B) at least one compound selected from oxidized paraffins, diphenyl hydrogenphosphite and hexamethylphosphoric triamide, and (C) at least one organomolybdenum compound selected from molybdenum dithiophosphate and molybdenum dithiocarbamate.