To provide a steering control device of a working vehicle capable of increasing safety and operability since the sharp turning of front wheels 13 is eliminated when a vehicle is not turned in working, for example, when the vehicle adjusts its course to change a lane in traveling or turns at a square crossing and capable of increasing durability since the front wheels are not always turned excessively and the wear of tires is reduced.
An intermediate case 4 is rotatingly supported on an axle casing 1 at both ends, and an axle case 3 steered through a power steering 2 is rotatingly supported on the outside of the intermediate case 4. An actuator 7 is installed in the intermediate case 4. When the vehicle travels on a road, the front wheels 13 are steered by the power steering 2 only, and when the vehicle is at work, the front wheels 13 are steered together with the actuator 7. In addition, when the vehicle is at work, the intermediate case 4 is driven to a swing inner side simultaneously or after the high-speed driving of the front wheels 13 and simultaneously or after the output of a rear wheel brake on the swing inner side.
HYODO OSAMU
YOSHIZAWA YUJI
MURAKAMI TATSUZO
