Patent ID: 7932219

Claim:
A grease composition consisting of a base oil, a thickener and an extreme-pressure agent containing sulfur in a molecular structure thereof, wherein said extreme-pressure agent is added to said base oil so that a product of an amount (mgS/g) of active sulfur contained in said extreme-pressure agent and an addition amount (wt %) of said extreme-pressure agent with respect to an entire amount of said grease composition is in a range of 3 to 13, wherein said base oil is mineral oil, said thickener is lithium soap, and said extreme-pressure agent is at least one extreme-pressure agent selected from among sulfurized grease, sulfurized olefin, ester sulfide, molybdenum dithiocarbamate, zinc dithiocarbamate, zinc dithiophosphate, and molybdenum dithiophosphate.