| 摘要 |
The invention provides a grease composition which is capable of extending the bearing life even at elevated temperatures and has little effect on acrylic rubber; and a bearing in which the above-mentioned grease composition is packed. The grease composition contains a thickener and a base oil, the base oil including a synthetic hydrocarbon oil in an amount of 20 mass% or more of the total mass of the base oil and an ester-based oil in an amount of 20 mass% or less of the total mass of the base oil, and the thickener containing a diurea compound represented by formula (I): R 1 -NHCONH-R 2 -NHCONH-R 3 wherein R 2 is a divalent aromatic hydrocarbon group having 6 to 15 carbon atoms, and R 1 and R 3 may be the same or different and represent cyclohexyl group or a straight-chain or branched alkyl group having 8 to 18 carbon atoms, with the ratio of the number of moles of the cyclohexyl group to the total number of moles of R 1 and R 3 being 60 to 95%. The bearing has the above-mentioned grease composition sealed therein. |
