| 摘要 |
An in-wheel motor drive device (21) is configured in such a manner that a motor section (A), a speed reduction section (B), and a bearing section (C) for a wheel, which are sequentially arranged from the inboard side of a vehicle to the outboard side thereof, are held by a casing (22), the speed reduction section (B) being provided with: a speed reducer input shaft (25) rotated and driven by the motor section (A); and a speed reducer output shaft (28) for transmitting the rotation of the speed reducer input shaft (25), the speed of the rotation having been reduced, to the bearing section (C) for a wheel. The speed reducer output shaft (28) has a weakest section (W) at a position closer to the inboard side than the section where the speed reducer output shaft (28) and the bearing section (C) for a wheel are connected. Among the sections of the power transmission system of the device, the weakest section (W) has the lowest strength against external force inputted into the device. |
