| 摘要 |
PROBLEM TO BE SOLVED: To provide a front-rear wheel driving force distribution control device for a hydraulically driven vehicle capable of automatically changing from 2WD to 4WD according to a traveling condition without needing a complicated sensor. SOLUTION: The rotation of a travel motor 7 is transmitted to a tire 11f through a transmission 8, a propeller shaft 9 and an axle 10f. An electromagnetic clutch 30 provided on the rear side fluctuates clutch transmission torque according to the inputted voltage to distribute driving force to front and rear wheels 11f, 11r. The inlet pressure Pin and outlet pressure Pout of the travel motor 7 are detected, and the differential pressure is made motor effective pressure Pm and used for estimating the driving torque of the travel motor 7. When the motor effective pressure Pm exceeds a threshold P1, clutch transmission torque is generated, and front-rear wheel driving force distribution is controlled to perform four-wheel drive travel in a condition with large driving torque.
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