| 摘要 |
First and second rotational shafts and an output shaft are provided in a casing. A drive gear on the second rotational shaft and a driven gear of the output shaft mesh with each other. A clutch device, which transmits rotation, obtained by synthesizing rotations of the first and second rotational shafts, or rotation of the second rotational shaft to the output shaft is provided. A counter gear meshes with an intermediate gear and a bearing device is provided between the first rotational shaft and the counter gear. The bearing device is configured by combining four angular contact ball bearings and is arranged at a position corresponding to a meshed portion between the counter gear and the intermediate gear in the axial direction of the first rotational shaft.
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