| 摘要 |
<p>PURPOSE:To prevent the dispersion of the connection timing of a hydraulic clutch by installing a control means for varying the time of the initial stage of the connection of a hydraulic clutch device. CONSTITUTION:With a controller, the solenoids 37-40 for selecting the solenoid valves 18 and 19 for operating the shifters 31 and 32 of a main transmission, solenoids 41 and 42 of a solenoid valve 22 for selecting an advance/retreat selecting device, and a proportional solenoid 47 for controlling the proportional reducing valve 45 for controlling boosting of the advance/retreat selecting device are connected. The drive electric current control time for shifting a piston in the initial stage of the connection, for the proportional solenoid 47 for controlling the proportional reducing valve 45 of a hydraulic clutch 13 is properly selected. Accordingly, even if the bore diameter, etc., of the piston of the hydraulic clutch 13 disperse, the different feeling is not generated in the mechanical clutch connection, since adjustment is enabled in the stage of shipping of a tractor, and the stable performance is secured.</p> |
