| 摘要 |
PROBLEM TO BE SOLVED: To maintain good straight advancing performance as well as to decrease peak steering force and to eliminate a turning feeling and a climbing feeling by setting the caster angle of a steeling wheel on the front side in relation to the advancing direction is set to the minimum in a working vehicle to which a working machine is to be mounted. SOLUTION: In a working vehicle such as a tractor, a front weight 5 and a handle post 6 are arranged on the front part of a vehicle body frame 2, and a working machine such as a rotary cultivator is mounted on the rear part of it. The working vehicle is provided with the caster angleθ, namely, the angle formed by an axis L1 passing a king pin 42 in relation to a vertical line L0 passing an axle of a front wheel 3. In this case, the caster angleθis set to the minimum by being arranged rearward from the ground contact point G of the front wheel 3. The caster angleθis specified in the range of -0.5 deg. to -2 deg., preferably, it is set to -1.0 deg.. Therefore, steering force, particularly, peak steering force is reduced, a turning feeling and a climbing feeling are eliminated, and good straight advancing performance is maintained.
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