| 摘要 |
PROBLEM TO BE SOLVED: To secure a necessary motor cooling function while making the size in a diameter direction compact in a structure where a motor is connected with a speed reducer by bolts through an intermediate flange on two circumferences, i.e. an inner circumference and an outer circumference.SOLUTION: An outer circumferential side coolant passage 34 is provided in a circumferential direction at an area between a first bolt 32, which connects an electric motor 22 with an intermediate flange 30 while disposing the intermediate flange 30 serving as a cooler between the electric motor 22 as a driving part and a speed reducer 23, and a second bolt 33 which connects the intermediate flange 30 with the speed reducer 23. An inner circumferential side coolant passage 35 is provided in a circumferential direction at an area located at the flange inner diameter side relative to the second bolt 33. A coolant passes through both coolant passages 34, 35. |
