| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a working vehicle having a hydraulic control device capable of smoothly boosting by calculating the effect of centrifugal force generated by the rotation of a hydraulic clutch input shaft upon boosting by operating from a non-connected state of the hydraulic clutch with the transmission torque at substantially zero until the hydraulic clutch is connected. <P>SOLUTION: This vehicle is provided with a return spring 77 having urging force for bringing an advancing/retreating clutch D into a connected state by stepping of a clutch pedal 119 and supplying operating oil into the advancing/retreating clutch D, and bringing the advancing/retreating clutch D into a disconnected state by releasing the stepping of the clutch pedal 119. Hydraulic pressure sufficiently higher than the urging force of the spring 77 is output at starting of the advancing/retreating clutch D in the disconnected state. Thereafter, hydraulic pressure substantially equal to the urging force of the spring 77 to one exceeding the urging force of the spring 77 is gradually output, and the advancing/retreating clutch D is brought into a connected state. Therefore, boosting from the disconnected state to the connected state of the advancing/retreating clutch D can be smoothly performed. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
