| 摘要 |
PROBLEM TO BE SOLVED: To effectively prevent flaking on a rolling/sliding surface caused by hydrogen embrittlement. SOLUTION: A grease composition filled in a rolling bearing for automobile electric equipment/accessory is obtained by mixing an additive into a base grease comprising a base oil and a thickener. The additive comprises at least one bismuth additive selected out of inorganic bismuth and organic bismuth containing no sulfur component, and the mixing ratio of the bismuth additive is 1.05-10 pts.wt. to 100 pts.wt. of the base grease. The inorganic bismuth is at least one inorganic bismuth selected out of bismuth trioxide, bismuth powder and bismuth carbonate, and the organic bismuth is organic acid bismuth. The thickener is a urea-based thickener, and the base oil is at least one oil selected out of alkyl diphenyl ether oil and poly-α-olefin oil. COPYRIGHT: (C)2007,JPO&INPIT |
