| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a roller bearing for a fuel cell system, which can effectively prevent the peeling on a rolling surface attributing to water infiltration, and has an excellent long-term durability. <P>SOLUTION: In the roller bearing for the fuel cell system, the roller bearing 1 comprises an inner ring 2 and an outer ring 3, and a plurality of rolling elements 4 disposed between the inner ring 2 and the outer ring 3. A sealing member 6 for sealing grease 7 around the rolling element 4 is installed in both axial directional end openings 8a, 8b of the inner ring 2 and the outer ring 3. The grease is a water-resistant grease cnostituted by compounding an additive agent containing at least a water dispersing agent blended with a base grease consisting of a nonaqueous base oil and a thickening agent. In the compound amount of the water dispersing agent, the saturated moisture content of the water-resistant grease is an amount set to 30 to 60 wt.%. <P>COPYRIGHT: (C)2008,JPO&INPIT |
