Patent ID: 6214774
Filing Date: 2001-04-10
Classification: C07C,C10M,C10N

Abstract:
A grease-sealed rolling bearing for a fan of forced cooling in an engine of an automobile which restricts or prevents generation of hoot sound and provides service life of said grease of greater than 6,000 hours, which bearing is filled with a grease comprising a base oil, which base oil is a silicone oil having a viscosity of 30 to 500 mm.sup.2 /s at 40.degree. C. and a viscosity of 30,000 mm.sup.2 /s or less at -30.degree. C., and a thickening agent having a diurea compound, wherein the ratio of said base oil and said thickening agent is 2 to 30 wt-%, with the diurea compound having a general formula of:R.sub.1 --NHCONH--R.sub.2 --NHCONH--R.sub.3whereinR.sub.1 is a straight chain saturated alkyl group having 6 to 18 carbon atoms,R.sub.2 is a tolylene, diphenylmethylene or dimethylbiphenylene group, andR.sub.3 is an alicyclic group,wherein the ratio of the straight chain saturated alkyl group to the alicyclic group is within a range of 5 to 95 mol-% to 95 to 5 mol-%.