| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of damage, such as abnormal wear, by feeding lubrication oil to a slide contact part between the outer peripheral surface of a holder 14 and the inner peripheral surface of an outer ring 23 during high speed operation also. SOLUTION: An oil feed hole 24 is formed in the end part of an outer ring 23 and lubrication oil is discharged through the oil feed hole 24 toward the outer peripheral surface of a holder 14. Lubrication oil discharged, as described above, to the outer peripheral surface of the holder 14 high-efficiently lubricates the outer peripheral surface and the inner peripheral surface of the outer ring 23. As a result, a problem described above can be solved. |
