| 摘要 |
An output shaft is disposed in parallel relation to an engine crank shaft. The output shaft is formed with a gear portion. A first drive shaft is formed with another gear portion which is meshed with the gear portion formed on the output shaft, and disposed in the longitudinal direction intersecting the output shaft at right angle. The first shaft is adapted to transmit power to either ones of front and rear wheels. The output shaft and the first drive shaft are supported on a case. The case is detachably attached to an internal combustion engine. A second drive shaft is supported on an extension of the first drive shaft, and connected to the first drive shaft. The second drive shaft is adapted to transmit power to the remaining wheels of the front and the rear wheels. Due to the foregoing arrangement, both the front and rear wheels are simultaneously driven by one engine output shaft.
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