Patent ID: 7325640
Filing Date: 2008-02-05
Classification: B60K

Abstract:
1. A power transmission system for a four-wheel drive vehicle, comprising: a power transmission mechanism, provided in a vehicle arranged such that power is always transmitted to one of two pairs of wheels consisting of a pair of front wheels and a pair of rear wheels, which transmits power to the other pair of wheels; a power transmission control means for controlling the power transmission mechanism to adjust the power transmitted to said other pair of wheels; and a differential gear unit arranged between left and right wheels in said other pair, to distribute the power transmitted from the power transmission mechanism to said other pair, between the left and right wheels in said other pair, wherein: said differential gear unit is a mechanical-type torque-sensitive limited-slip differential gear unit with a differential limiting function for producing a differential limiting force between the left and right wheels in said other pair depending solely on power transmitted to an input element of the differential gear unit, and said power transmission control means controls the power transmitted from the power transmission mechanism to the differential gear unit according to a driving state of the vehicle.