| 摘要 |
PURPOSE:To simplify a structure of double-speed four wheel drive as well as to aim at smooth turning, by installing a speed increasing device making a peripheral speed of each front wheel about two times over that of each rear wheel, while interposingly installing a viscous coupling in a transmission shaft at a transmission route between this speed increasing device and the front wheel. CONSTITUTION:Power out of an engine 1 is transmitted to a differential pinion shaft 5 via the clutch 3 and the gear shift installed in a transmission case 2 and the it is transmitted to a symmetrical pair of rear wheels via a rear-wheel differential gear 6. In this case, in this transmission case 2, there is provided with a front-wheel transmission shaft 8 in parallel with the differential pinion shaft 5, and both these shafts are connected together through a speed increasing means 9. And this speed increasing means 9 is formed by a driving gear 10 and a driven gear 11, while each of these transmission ratios is set to a ratio making each peripheral speed of front wheels about two times over that of rear wheels. On the other hand, the front-wheel transmission shaft 8 is divided into two parts, respectively front and rear transmission shafts 8a and 8b, and these divided shafts are connected together by a viscous coupling 13.
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