| 摘要 |
PURPOSE:To provide a compact four-wheel-drive vehicle and utilize a conventional system, by using one planet gear to drive rear wheels so that a front-drive vehicle with a side engine is run as the four-wheel-drive vehicle and by using another planet gear to change a high and a low speeds for each other. CONSTITUTION:Driving power from a transmission 3 is transmitted to the sun gear S1 or the first planet gear 6 from a speed reduction gear 5. The ring gear R1 of the first planet gear 6 is secured to the sun gear S1 or a casing by a clutch 7. As a result, the speed of a pinion P1 is kept unchanged or is reduced to drive the pinion P2 of the second planet gear 8. The sun gear S2 of the second planet gear 8 drives front wheels 11, 12 through a final speed reducer 17 for the front wheels 11, 12. A ring gear R2 drives rear wheels 9, 10 through a transmission gear 24 and bevel gears 25, 26. Since the drive o the front and rear wheels 9, 10, 11, 12 and the shifting of a high and a low speeds are effected by the planet gears 6, 8, respectively, a conventional drive system can be utilized and a vehicle can be made compact.
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