| 摘要 |
<P>PROBLEM TO BE SOLVED: To appropriately prevent a failure and deterioration of a motor even if rain water or the like intrudes through an air inlet by improving water proofing property of the motor. <P>SOLUTION: A partition wall 21 which partitions between a rotor 14 and a stator coil 16 is provided in the inner periphery of the stator 14 of the motor 5 over the whole circumference. A front end of the partition wall 21 is made to abut on a sensor board 19, which seals an opening on a front side of the stator 14 and through which a rotary shaft 12 passes, and a rear end of the partition wall 21 is sealed by a rear partition wall 22. A receiver cylinder 27, which is formed in a cap 25 sealing an opening on a rear side of a hammer case 4 so as to pivotally support the rotary shaft 12, is fitted in a through hole 20 for the rotary shaft 12 in the sensor board 19. With this structure, the open air sucked into a housing 2 through the air inlet 42 by the rotation of a fan 41 thereby passes only between the stator coils 16 outside the partition wall 21. <P>COPYRIGHT: (C)2013,JPO&INPIT |
