| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a drain hole structure for a fully-enclosed motor that reduces entry of water, dust, and the like from outside of the motor. <P>SOLUTION: A fully-enclosed motor has a housing 20 provided with a through hole 21. In the through hole 21, a bush 10 is inserted that has an outer circumferential surface to be fitted in an inner circumferential surface of the through hole 21. On the outer circumferential surface of the bush 10, nonlinear grooves 11 to 15 are provided that pass through the motor. The nonlinear grooves 11 to 15 allow water to be drained from the motor to the outside, and also prevent water, dust, and the like from entering the inside of the motor therethrough against gravity. <P>COPYRIGHT: (C)2013,JPO&INPIT |
