| 摘要 |
In a rolling bearing used for supporting the principal axis of machine tools and the like, oil supply holes (5) for air-oil lubrication that penetrate through to the bearing space are provided in the outer ring (2). On both side surfaces of the outer ring (2), notches (9) for exhausting the air-oil that are indented in the axial direction of the bearing are provided from the internal diameter surface (2b) to the external diameter surface (2c). In addition to providing a circumferential groove (6) that communicates with the oil supply holes (5) on the external diameter surface of the outer ring (2), ring-shaped grooves (7, 7) are severally provided on both sides of the circumferential groove (6) on said external diameter surface of the outer ring (2) and in each ring-shaped groove (7), a ring-shaped sealing member (8) is provided. |
