| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball bearing having the fretting resistance performance when stopping it and capable of maintaining the lubricating performance when rotating it. SOLUTION: The churning type grease 5 having 15-20×10-2 m2/s of the base oil viscosity and 200-300 of the consistency is arranged in a rolling surface 1a of a race part 1, while the channeling type grease 6 having 24-35×10-2 m2/s of the base oil viscosity and 240-270 of the consistency is arranged in a retainer 4. With this structure, when rotating a ball bearing, lubrication is continued while maintaining a lubricating oil film 7 inside of the bearing by the grease 6, and when stopping the ball bearing, the grease 5 protects the lubricating oil film so as to prevent the fretting. |
