| 摘要 |
PROBLEM TO BE SOLVED: To prevent the outflow of oil separated from grease. SOLUTION: This ball bearing comprises a ring-like inner ring 4, a ring-like outer ring 6 arranged on the radially outside of the inner ring 4, and a plurality of rolling elements 12 interposed between the inner ring 4 and the outer ring 6. Trap recessed parts 24, 26 for catching the oil separated from grease are provided on both end parts of the polished surface of the inside surface of the outer ring (and/or both end parts of the polished surface of the inside surface of the inner ring 4), and the oil flowing to the outside is caught by the trap recessed parts 24, 26. Another objective motor is provided with the ball bearing having such a structure. |
