| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power transmission device for a four-wheel drive car capable of preventing low fuel-efficiency at the time of two-wheel driving by completely stopping rotation of a driving-force transmitting path to rear wheels at the time of the two-wheel driving. Ž<P>SOLUTION: The power transmission device is provided with a front-wheel differential 16 for receiving input driving-force and outputting the driving-force to right-and-left front wheels 46, 48 and to a driving-force distribution device 14 via a bevel gear 50 and an output pinion 52, a rear-wheel differential 18 for receiving input driving-force distributed from the driving-force distribution device 14 and outputting the driving-force to right-and-left rear wheels 80, 82, a first clutch mechanism 20 capable of interrupting and permitting driving-force transmission between the front-wheel differential 16 and the bevel gear 50, and a second clutch mechanism 22 capable of interrupting and permitting driving-force transmission between the rear-wheel differential 18 and a right rear-wheel driving axle 78. In a four-wheel drive mode, the first clutch mechanism 20 and the second clutch mechanism 22 are connected with each other and driving-force distribution of the driving-force distribution device 14 is automatically controlled according to a traveling condition. In a two-wheel drive mode, the first clutch mechanism 20 and the second clutch mechanism 22 are disengaged. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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