| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of damage, such as abnormal wear, by effectively utilizing lubrication oil injected from a nozzle 24 during high speed operation also. SOLUTION: A slope 25 is formed on the inner peripheral surface of the end part of a holder 23. Lubrication oil is injected through a nozzle 24, as shown by an arrow mark β, from obliquely above against the proximity part of an inner ring track 11 formed in the outer peripheral surface of an inner ring 12. After, based on the presence of the slope 25, lubrication oil injected through the nozzle 24 reaches the vicinity part of the inner ring track 11 without flying of it to a periphery as a result of collision of it with the holder 23, the lubrication oil is served to lubricate contact parts. As a result, a problem described above can be solved. |
