| 摘要 |
PROBLEM TO BE SOLVED: To improve responsivity of straight-ahead moving control in a two-pump two-motor type traveling vehicle, and to avoid a remarkable lowering of straight-ahead moving property at the time of a sudden failure in a straight-ahead moving control actuator. SOLUTION: A tractor T comprises right and left traveling hydraulic motors 3R, 3L making right and left traveling portions 1R, 1L independently travel; a pair of HST pumps 2R, 2L respectively connected to the right and left traveling hydraulic motors 3R, 3L, and changing the speed of output rotations of the traveling hydraulic motors 3R, 3L according to operation of pump levers 4R, 4L; and a pair of operating wires 5R, 5L operating the pump levers 4R, 4L of the HST pumps 2R, 2L according to operation of a main transmission lever 7 and a steering wheel 8. A straight-ahead moving controlling actuator 9 is linked to the operating wire 5L operation one pump lever 4L, thereby adjusting arm length in the other pump lever 4R. COPYRIGHT: (C)2007,JPO&INPIT
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