| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing waterproof device capable of effectively preventing the entry of slurry. SOLUTION: A bearing 5 is fitted into the bearing installation hole 2 of a pulley 1, and the bearing 5 is pivotally supported on a pivot shaft 10. The inner ring 6 of the bearing 5 is fixed, at the tip flange part 12 of the pivot shaft 10, to an installation frame 13 through a collar member 15. The tip side of the bearing 5 and the tip flange part 12 are covered with a waterproof cap 20, and the base end side of the bearing 5 is covered with a waterproof ring 22. The bearing side outer peripheral part 16 of a collar member 15 is radially enlarged along the inner ring 6 of the bearing 5 to near an outer ring 7, and the base end side outer peripheral part 17 of the collar member 15 is radially enlarged along the installation frame 13 to near a base end side boss part 4 to form a ring-shaped partition chamber 18 between the base end side outer peripheral part 17 and the bearing 5. By overlapping the inner peripheral part 23 of a waterproof ring 22 with the bearing side outer peripheral part 16 of the collar member 15 in the partition chamber 18, the partition chamber 18 is formed in a waterproof labyrinth 18a.
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