| 摘要 |
The present invention pertains to a ball bearing (1) comprising: an inner ring (2) that has an inner ring raceway surface (11) at the outer periphery thereof; an outer ring (3) that has an outer ring raceway surface (15) at the inner periphery thereof; a plurality of balls (4) disposed between the inner and outer ring raceway surfaces (11, 15); and a holder (5). The holder (5) has a plurality of pocket holes (27). The inner periphery of the outer ring (3) is in contact with the outer peripheral surface (28) of the holder (5) and guides the outer diameter of the holder (5). Ag rease reservoir groove (20) is formed in the inner periphery of the outer ring (3) and only at one side in the axial direction (X) relative to the outer ring raceway surface (15). The grease reservoir groove (20) communicates with the outer ring raceway surface (15). In relation to the axial direction (X), an end edge (40) of the grease reservoir groove (20) at one side in the axial direction (X) matches end sections, at one side in the axial direction (X), of the peripheral walls (30) of the pocket holes (27). Thus, the present invention is capable of good grease lubrication over a long period and is capable of providing a ball bearing that can prevent the occurrence of partial abrasion in the outer peripheral surface of the holder. |
