| 摘要 |
PROBLEM TO BE SOLVED: To reduce the torque transmission capacity of a two-way clutch mechanism of a four-wheel drive vehicle to miniaturize the vehicle and to reduce the cost. SOLUTION: A multiple disc clutch 11 for distributing a part of the torque of front wheels to rear wheels is mounted between a driving shaft 5 connected to front wheels as main driving wheels and a driven shaft 6 connected to rear wheels as sub-driving wheels. A torque cam mechanism 12, a hydraulic pump 13 and a two-way clutch mechanism 14 are successively mounted between the driving shaft 5 and the driven shaft 6. When the rotational frequency of the front wheels is more than that of the rear wheels, the two-way clutch mechanism 14 is fastened, a first rotor 23 of the hydraulic pump 13 interlocking with the front wheels and a second rotor 24 interlocking with the rear wheels are relatively rotated, and the rotational load is produced by a hydraulic circuit 25. A first cam element 19 and a second cam element 21 of the torque cam mechanism 12 are relatively rotated by this rotational load to produce the thrust power, and the multiple disc clutch 11 is fastened by the thrust power to provide a vehicle with four-wheel driving.
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