| 摘要 |
PROBLEM TO BE SOLVED: To provide a rolling bearing capable of combining an indentation-proof property and a rolling fatigue life at a high level while securing easiness in obtaining a material, and to achieve low torque.SOLUTION: A deep-grooved ball bearing 1 includes an outer ring 11, an inner ring 12, a plurality of balls 13 and a cage 15 for holding the plurality of balls. At least the outer ring 11 and the inner ring 12, or the plurality of balls are made of quench-hardened steel such as JIS standard SUJ2, a nitrogen concentration of an outer ring rolling surface 11A, an inner ring rolling surface 12A and a ball rolling surface 13A is 0.25 mass% or more, an amount of residual austenite is 6 vol% or more and 12 vol% or less, the cage 15 is provided with a ball non-contact portion 32, and a value of A/(B+C) is determined to 0.70-0.90, when a length in the circumferential direction of a pocket of the ball non-contact portion 32 is A, a diameter of the ball is B, and a clearance gap between the ball and a ball opposite face is C. |
