| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a structure for preventing oil infiltration in an electric motor, discharging oil infiltrated in the electric motor without accumulating the oil inside the electric motor and preventing reduction of a service life and malfunction of the electric motor. <P>SOLUTION: In the direct current motor M, in a state of a front housing 7 fitted into a first large diameter hole 3a and a right bearing 10 fitted into a second large diameter hole 3c, a flange part 6a formed on a rear housing 6 is fixed to a mounting plate 2. A first discharge passage for discharging the oil infiltrated in a through-hole 3 from the outside of an oil seal 12 to the outside of a housing case is formed of: an introduction groove 21 formed in the inner peripheral face of the through hole 3; a discharge groove 22 formed in the first large diameter hole 3a; a communication hole 23 bringing the introduction groove 21 into communication with the discharge groove 22; a first through-hole 25 formed in the flange part 6a and communicating with the discharge groove 22; and a discharge hole 24 formed in the housing case and bringing a discharge opening into communication with the first through-hole 25. <P>COPYRIGHT: (C)2011,JPO&INPIT |
