| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball bearing capable of actualizing grease lubrication between an outer ring raceway surface and the outer surface of each ball over a long period.SOLUTION: The ball bearing includes an inner ring having an inner ring raceway surface on the outer periphery, an outer ring 3 having an outer ring raceway surface 15 on the inner periphery, a plurality of balls 4 arranged between the inner ring raceway surface and the outer ring raceway surface 15, and a cage 5. On and in the outer periphery of the inner ring, an inner ring shoulder part and a counter bore are provided at one side in an axial direction X of the inner ring and at the other side in the axial direction X of the inner ring, respectively. In each pocket hole of the cage 5 at the one side in the axial direction X, a through-hole 52 is formed passing through an outer peripheral face 28 of the cage 5 and an inner peripheral face 51B of the cage 5.SELECTED DRAWING: Figure 2 |
