| 摘要 |
PROBLEM TO BE SOLVED: To provide a farm working tractor of four wheel drive, having a stable turning radius of the vehicle, corresponding to the steering angle of right and left wheels, allowing smooth turns. SOLUTION: In turning operation, output of a turning hydraulic driving means 61 is transmitted to each rear wheel planetary gearing mechanism 51 to provide a torque in reverse direction to each other, so that the right and left wheels 3, 3 have a difference in their speeds. A front wheel planetary gearing mechanism 38 is provided between a running hydraulic driving means 81 and a front axle mechanism 15, and a power switching mechanism 91 and a braking means 96 are provided between the turning hydraulic driving means 61 and the front wheel planetary gearing mechanism 38. In forward turning operation, output of the turning hydraulic driving means 61 adjusted according to the steering angle of the both front wheels 2, 2, is transmitted to the front wheel planetary gearing mechanism 38 through the power switching mechanism 91 to continuously increase the speed of the both front wheels 2, 2. COPYRIGHT: (C)2004,JPO
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