| 摘要 |
PROBLEM TO BE SOLVED: To provide an electro-motive drive device rotatably supporting a rotor and a decelerator without providing a partition wall on a case and attaining a small diameter of a rotor bearing. SOLUTION: An electric motor 5 comprising a stator 6 and the rotor 7 is stored in the case 2. The decelerator 8 for decelerating rotation of the rotor 7 and outputting it is constituted by a sun gear 9 of a rotor rotation shaft 7c; a ring gear 10 fixed in the case 3; a pinion 11 with a step integrally formed by a large diameter pinion 11a engaged with the sun gear 9 and a small diameter pinion 11b engaged with the ring gear 10; and a carrier 12 for rotatably supporting the pinion 11 with the step. An output shaft 13 is provided on the rotor rotation shaft 7c and the carrier 12 is bonded to it. The output shaft 13 is rotatably supported on the case 4 through a double row bearing 14 given with a previous pressure. The rotor rotation shaft 7c is extended to the output shaft 13 and is abutment-fitted to it, and the rotor bearing 20 is provided on the fitting part. An opposite end of the rotor rotation shaft 7c is rotatably supported on the case portion 2 by the other rotor bearing 21. COPYRIGHT: (C)2008,JPO&INPIT
|
