| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a ball bearing that has an excellent seizure resistance even under a high temperature of 200 deg.C or higher and a heavy load. SOLUTION: The ball bearing holds a plurality of balls rollable between an inner ring and an outer ring. A ratio Ri/D of a radius of curvature Ri of a groove as an inner ring raceway to an outside diameter D of the balls is more than 52% and not more than 54% and a ratio Re/D of a radius of curvature Re of a groove as an outer ring raceway to the outside diameter D of the bass is more than 52% and not more than 53%, or the ratio Ri/D is not less than 51% and not more than 54% and the ratio Re/D is more than 53% and not more than 55%. A filler is grease comprising perfluoropolyether oil of a kinematic viscosity of 20 to 200 mm<2> /sec. at 40 deg.C as base oil and polytetrafluoroethylene as a thickening agent.</p> |
