To provide an easy-to-handle agricultural vehicle capable of automatically correcting a steering angle of front and rear wheels to a proper value for safe traveling.
The agricultural vehicle for manually changing over between two-wheel steering and four-wheel steering is provided with sensors 18, 28 detecting the steering angles of the front wheels 10a, 10b and the rear wheels 20a, 20b, and a solenoid valve 34 allowing hydraulic pressure from a hydraulic pump 30 to act on a front wheel driving hydraulic cylinder 12 and a rear wheel driving hydraulic cylinder 22 while changing over. The agricultural vehicle is further provided with a control means obtaining the proper steering angle of the rear wheels to be set as a rear wheel target value, having the steering angle of the rear wheels to pass through the rear wheel target value, switching the solenoid valve to either of a two-wheel steering position, a four-wheel steering position of the same phase and the four-wheel steering position of the opposite phase to act on the rear wheel driving hydraulic cylinder, and correcting the rear wheels to have the normal steering angle as a means for correcting the front and rear wheels to have the proper steering angles when the steering angles of the front and rear wheels are out of the normal values at the start of an engine.
COPYRIGHT: (C)2005,JPO&NCIPI
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Horimai Kazuharu