Rolling bearing, rolling bearing for fuel cell, compressor for fuel cell system and fuel cell system

Abstract

The rolling bearing of the invention to be incorporated in the compressor for fuel cell system comprises a fluorine-based grease containing a fluororesin and a fluorine-based oil, a urea grease containing a urea compound and a synthetic oil or a lithium complex grease containing a lithium complex and a synthetic oil encapsulated therein. In this arrangement, the grease deterioration of the rolling bearing incorporated in the compressor for force-feeding various fluids between machines can be prevented, making it possible to provide a fuel cell system which can maintain stable operation over an extended period of time.

1 . A rolling bearing having a fluorine-based grease containing a fluororesin and a fluorine-based oil, a urea grease containing a urea compound and a synthetic oil or a lithium complex grease containing a lithium complex and a synthetic oil encapsulated therein.  
     
     
         2 - 11 . (canceled)  
     
     
         12 . The rolling bearing as defined in  claim 1 , wherein there is encapsulated a grease having a vapor pressure of not higher than 1.3×10 −1  Pa at 25° C. as a base oil.  
     
     
         13 . The rolling bearing as defined in  claim 12 , wherein the base oil is an alkyl chain-derived polyphenylether oil, an alkyl chain-derived naphthalene oil, a paraffin-based hydrocarbon oil, a fluorine-based oil, an alkylcyclopentane or a mixture oil thereof.  
     
     
         14 . The rolling bearing as defined in  claim 12 , wherein the base oil is an alkylcyclopentane or a mixture oil thereof.  
     
     
         15 - 16 . (canceled)  
     
     
         17 . The rolling bearing as defined in  claim 1 , wherein there is encapsulated a grease composition comprising an electrically-conductive material incorporated therein in an amount of from 0.1 to 10% by weight or a grease composition substantially free of sulfonate.  
     
     
         18 . The rolling bearing as defined in  claim 17 , wherein the electrically-conductive material is carbon black.  
     
     
         19 . The rolling bearing as defined in  claim 17 , wherein the electrically-conductive material is carbon nanotube.  
     
     
         20 . The rolling bearing as defined in  claim 18 , wherein the amount of the thickening agent based on the total amount of the grease composition is from 5 to 40% by weight as calculated in terms of total amount, including that of carbon black.  
     
     
         21 - 25 . (canceled)  
     
     
         26 . The rolling bearing as defined in  claim 1 , wherein there is encapsulated a grease having an initial worked penetration of from 150 to 240 at 25° C.  
     
     
         27 . The rolling bearing as defined in  claim 26 , wherein the thickening agent incorporated in the grease is made of a metal complex soap and accounts for from 20 to 30% by weight of the total amount of the grease.  
     
     
         28 - 43 . (canceled)