| 摘要 |
PROBLEM TO BE SOLVED: To prevent damage such as galling from being generated in a sliding part between an inner ring 6 and a rotating shaft inserted to an inside thereof without using a sleeve. SOLUTION: A recess groove 14 of polygonal line shape in which inclining direction is alternately changed is formed on an inner peripheral surface of the inner ring 6. The sliding part between the inner peripheral surface of the inner ring 6 and an outer peripheral surface of the rotating shaft is lubricated by a grease present inside the recess groove 14 in an assembled condition, whereby the above problem is solved. |
