| 摘要 |
An inner ring 1 and an outer ring 2 are assured by a non-destructive inspection that the maximum length of a non-metallic inclusion existing in an area between the raceway surface and a depth twice a depth Z0 where the maximum shearing stress exerts is 0.5 mm or less, The ball bearing is a highly reliable rolling bearing capable of preventing a short life product from occurring and having a stably assured long life, Further, at least one of the inner ring 31 and the outer ring 32 of the self-aligning roller bearing 30 has a contact angle theta of fiber flow with the roller 33 is 15° or less and is assured by the non-destructive inspection that the square root length of a defect such as non-metallic inclusion existing in the volume of a specimen is 0.3 mm or less where entire raceway circumferential surfacexmaximum sharing stress depth=volume of a specimen. The roller bearing 30 has an excellent rolling fatigue life even under an environment where a slip is liable to occur between rollers and inner and outer rings, foreign matter does not enter therein, and lubricating condition is excellent.
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