| 摘要 |
PROBLEM TO BE SOLVED: To elongate a bearing service life by making foreign matters included in a lubricant hardly enter between balls and a raceway groove of an outer ring and an inner ring, in a double-row ball bearing.SOLUTION: A double-row ball bearing 5 includes a plurality of first balls 11 disposed between an outer ring 16 and an inner ring 15 and configuring a first row, a plurality of second balls 12 disposed between the outer ring 16 and the inner ring 15 and constituting a second row having a pitch circle diameter larger than that of the first row, an annular first retainer 21 having a plurality of pockets 23 for retaining the first balls 11, and an annular second retainer 22 having a plurality of pockets 24 for retaining the second balls 12. Further the double-row ball bearing 5 includes an annular portion 30. The annular portion 30 covers a part exposed from the pockets 24 of the second balls 12 and facing a radial outer side, with the outer ring 16 from a radial outer side. |
