| abstract |
The present invention provides a grease composition having an excellent fretting wear resistance in a wide temperature region from low to high temperatures and particularly even at low temperatures and a rolling bearing in which the grease composition is packed. A grease composition ( 7 ) is packed inside a grease-packed bearing ( 1 ). The grease composition ( 7 ) contains base oil, a thickener, and an additive. The additive contains at least, one kind selected from among a phosphite ester shown by a chemical formula (1) or a phosphite ester shown by a chemical formula (2). The content of the phosphite ester is 0.5 to 4 parts by weight for 100 parts by weight which is the total of the amount of the base oil and that of the thickener. n n n n n n n n n n (In the chemical formulas (1) and (2), R 1 , R 2 , R 3 , R 4 , and R 5 denote a methyl group or an ethyl group respectively. R 1 and R 2 are the same group or different groups. R 3 , R 4 , and R 5 are the same group or different groups). |