| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball bearing capable of preventing effect of reduced costs from being impaired due to increase of the number of parts and realizing high dustproof property. SOLUTION: This ball bearing is provided with an outer ring 11 and an inner ring 12 manufactured by press-machining a steel plate, a plurality of balls 13 arranged between the outer ring 11 and the inner ring 12 so as to roll, and a holder 14 holding the plurality of balls 13. The outer ring 11 and the inner ring 12 have raceway track parts 11a, 12a and cylindrical parts 11b, 12d continuous with the raceway track parts and extending in the axial direction, respectively. A step difference part 22 whose wall thickness is reduced to separate it from the holder 14 is provided at an outer peripheral fringe of the cylindrical part 12d of the inner ring 12 to constitute labyrinth seal between the step difference part 22 and the holder 14. COPYRIGHT: (C)2004,JPO&NCIPI |
