| 摘要 |
PROBLEM TO BE SOLVED: To favorably secure straight running performance of a vehicle body. SOLUTION: The working vehicle is equipped with a steering operation area detection means detecting the steering operation area of a steering operation tool, a revolution speed detection means detecting the revolution speed of a drive shaft of each traveling part, a control means with these detection means connected to an input side, and a fine adjustment means connected to the output side of the control means and finely adjusting the attitude of a swash plate operating arm installed on either of the variable flow control pumps. When the difference in the revolving speed between the two drive shafts detected with the revolution speed detection means is smaller than a prescribed threshold, though the steering operation area detection means detects a steering operation area exceeding the straight traveling operation area, feedback control is performed so that the difference in the revolving speed between the two drive shafts detected with the revolution speed detection means becomes larger than a prescribed threshold by operating the fine adjustment means in accordance with the steering operation direction, and the attitude of one of the swash plate operating arms is finely adjusted. COPYRIGHT: (C)2004,JPO
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