Rolling bearing

Abstract

A rolling bearing holding two or more rolling elements 13 between inner ring 10 and outer ring 11 in such a way that these rolling elements can freely roll, and packed with a grease is described, wherein the grease is a mixture of at least one of metal complex soap-based grease and urea-based grease, each incorporated with 8 to 35% by mass of thickening agent, and fluorine-based grease comprising perfluoropolyether oil as a base oil incorporated with 15 to 42.5% by mass of polytetrafluoroethylene as a thickening agent, ratio of said at least one of the metal complex soap-based grease and urea-based grease versus said fluorine-based grease being 40 to 80:60 to 20 by mass, and total content of the thickening agents being 20 to 30% by mass.

What is claimed is:  
     
         1 . A rolling bearing holding two or more rolling elements between inner and outer rings in such a way that these rolling elements can freely roll, and packed with a grease, wherein said grease is a grease composition comprising a mixture of at least one of metal complex soap-based grease and urea-based grease, each incorporated with 8 to 35% by mass, based on the amount of the metal complex soap-based grease or the urea-based grease, of thickening agent, and fluorine-based grease comprising perfluoropolyether oil as a base oil incorporated with 15 to 42.5% by mass, based on the amount of the fluorine-based grease, of polytetrafluoroethylene as a thickening agent, ratio of said at least one of the metal complex soap-based grease and urea-based grease versus said fluorine-based grease being 40 to 80:60 to 20 by mass, and total content of the thickening agents being 20 to 30% by mass based on the amount of the grease composition.  
     
     
         2 . The rolling bearing as claimed in  claim 1 , wherein the thicknening agent is incorporated in each of the metal complex soap-based grease and urea-based grease at 10 to 30% by mass based on the amount of the metal complex soap-based grease or the urea-based grease.  
     
     
         3 . The rolling bearing as claimed in  claim 1 , wherein a mixture of urea-based grease and fluorine-based grease is used.  
     
     
         4 . The rolling bearing as claimed in  claim 1 , wherein polytetrafluoroethylene is incorporated at 15 to 35% by mass based on the amount of the fluorine-based grease.