| 摘要 |
<p>PURPOSE:To miniaturize an electric tool by providing a fan on the rotor blade side of a commutator motor and discharging a part of wind of a wind discharging passage against said rotor blade through small holes. CONSTITUTION:In an electric tool, when a commutator motor 1 rotates at a high speed, a fan 4 is rotated, forcedly discharging wind through a wind discharging passage 5. The wind discharged by the fan 4 is sucked through a suction port formed on the opposite side and, after cooling the commutator motor 1, discharged into the case 6 of a gear 2. Therefore, the discharged wind by the fan 4 cools a rotor blade 3 through wind discharging passages 5a, while cooling the motor 1. Accordingly, the tool can be miniaturized, without need for using a large motor.</p> |
