| 摘要 |
PROBLEM TO BE SOLVED: To prevent the abnormal abrasion of a commutator and a brush by installing a ventilating filter capable of passing only a gas so as to cover a ventilating path capable of passing the gas between the inside and the outside of a liquid-tight enclosed type motor. SOLUTION: A ventilating filter 28 capable of passing only a gas is mounted on a lead wire 20 so as to cover an opening at the end section of a coating 24 for covering an opening between the cable conductor of the lead wire 20 as a ventilating path between the inside and the outside of the motor 10 and the coating 24 of the lead wire 20. Consequently, even when the internal temperture of the motor 10 is changed by heat generated by the rotation of a commutator 12, air in a motor case 11 can be discharged to the outside through the ventilating filter 28 through the opening of the lead wire 20. The outside air can be sucked into the motor case 11 through the opening between these ventilating filter 28 and lead wire 20. As a result, pressure fluctuation with the temperature change of the inside of the motor 10 can be inhibited excellently. Accordingly, the abnormal abrasion of a commutator 17 and a brush 19 can be prevented. |
