| 摘要 |
PROBLEM TO BE SOLVED: To simplify the maintenance work of a bearing or the like by facilitating attaching/detaching of a bearing box, simplify the structure of a casing and a bolt stopping work, to reduce manufacturing costs and to enhance productivity. SOLUTION: A rear bearing box 28 is attached to the rear of a motor case 2. A rear lid body 29 is attached to the rear of an oil reservoir 3. Therefore when the maintenance work of an electric motor 13 and ball bearings 17, 18 is carried out, only the rear bearing box 28 can be removed from the motor case 2 with the rear lid body 29 left attached to the oil reservoir 3. The motor case 2 and the oil reservoir 3 are sandwiched by a front case 6, the rear bearing box 28 and the rear lid body 29. In this state, the rear bearing box 28, the rear lid body 29 and the front case 6 can be integrally assembled by screwing the long bolt 30 from the rear bearing box 28 and the rear lid body 29 to the front case 6.
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