| 摘要 |
PURPOSE:To make a turn smoothly and rapidly by providing power transmission systems which transmit power to main and sub-driving wheels having mutually different wheel diameters so as to increase the peripheral speed of the main driving wheel side, and providing a clutch which is disengaged at the time of making a turn in a specific way and a mechanism for increasing the speed of the sub-driving wheel. CONSTITUTION:In a vehicle, main and sub-driving wheels having mutually different wheel diameters are placed in front and in rear on a vehicle body. In this case, main and sub-power transmission systems 22, 23 corresponding to the main and sub-driving wheels respectively, and a nospin differential 24, etc. are provided in a power transmission 20 placed between the driving wheels. And, the main and sub-power transmission systems 22, 23 are formed in such a way that the peripheral speed of the main driving wheel side is the larger, while being interlockedly linked to a transmission 4 on a prime mover side via the nospin differential 24. Also, a front wheel clutch 25 which is disengaged when the center of turning of the vehicle comes to the inside from the one side outside of the main driving wheel is provided on the main power transmission system 22 while also providing a mechanism 27 for increasing the speed of the sub-power transmission system 23 at the time of the disengagement of the clutch 25.
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