| 摘要 |
PURPOSE:To avoid a tight corner braking phenomenon by transmitting power to one of the front and rear wheels of an FF four wheel drive vehicle via a one-way clutch and controlling a transfer gear ratio being related to the tire slip ratio at the time of tight cornering. CONSTITUTION:In an FF four-wheel-drive vehicle, the power of an engine 1 is directly transmitted to front wheels 5 via a clutch and a transmission 2, a front wheel differential gear 3, and front wheel axles 4. The front wheel differential gear 3 is also power transmittingly connected to two sets of one way clutches 11, 12 via the pairs of gears 7 and 8 of a transfer device 6 and a direction changing gear 10, to transmit the rotation of a propeller shaft 13 to rear wheels 16 via a rear wheel differential gear 14 and rear wheel axles 15. The gear ratios of the pairs of gears 7 and 8 are set above '1', '1 + S' ( S = a slip ratio at the time of tight cornering) respectively, and each of the pairs of gears 7, 8 are switched over go as to use the pair of gears 7 at the time of direct-connected four wheel driving by means of a sleeve 9 while using the pair of gears 8 at the time of normal traveling.
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