| 摘要 |
A device for changing the speeds of the front and rear wheels in a four-wheel-drive vehicle including a continuously variable speed-changing mechanism for the front wheels, which changes the input rotational speed and outputs it to the front wheel drive shafts, and a continuously variable speed-changing mechanism for the rear wheels, which changes the input rotational speed and outputs it to the rear wheel drive shafts. The device for changing the speeds of the front wheels and the rear wheels comprises a detector means for detecting the operation conditions of the vehicle, a steering angle sensor for detecting the steering angle of the vehicle, and a controller for variably controlling the speeds of the continuously variable speed-changing mechanisms based on the operation conditions of the vehicle. The controller sets a target speed-changing ratio obtained from the vehicle operating conditions to be a target speed-changing ratio for the rear wheels in the continuously variable speed-changing mechanism for the rear wheels, and sets a speed-changing ratio obtained from the target speed-changing ratio and from a steering angle detected by the steering angle sensor to be a target speed-changing ratio for the front wheels in the continuously variable speed-changing mechanism for the front wheels.
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