| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric power tool which achieves sufficient dustproof performance in a bearing part.SOLUTION: An electric power tool includes: a motor 31 serving as a driving source; a rotation shaft which is rotated by the motor 31; a bearing 18 which pivotally supports the rotation shaft; a bearing storage hole 12b in which the bearing 18 is supported; and a dustproof collar 40 which is disposed adjacent to the bearing 18 and rotates with the rotation shaft. A space is formed between an outer peripheral surface 40c of the dustproof collar 40 and an inner peripheral surface of the bearing storage hole 12b. A helical channel 40d, which causes feed action toward the opening side of the bearing storage hole 12b utilizing rotations of the dustproof collar 40, is formed on the outer peripheral surface 40c of the dustproof collar 40. |
