| 摘要 |
PROBLEM TO BE SOLVED: To ensure the rotation of a 4-wheel drive agricultural tractor by stabilizing the rotating radius of a traveling machine body according to the steering angle of both lateral front wheels. SOLUTION: In the rotating operation of the traveling machine body, power is transmitted from a variable hydraulic driving means 61 driven by the power of an engine to each planet gear mechanism 51 or 51 so as to give mutually reverse directional rotating forces, whereby the rotating speeds of lateral rear wheels 3 and 3 are mutually differed. A front wheel speed increasing mechanism 35 for increasing the rotating speeds of both the lateral front wheels 2 and 2 in the forward rotating operation of the traveling machine body is provided on the upstream side from a front accelerator mechanism 15. COPYRIGHT: (C)2004,JPO
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