| 摘要 |
<p>PURPOSE: To prevent the occurrence of abnormal double meshing by stopping rotation of an upper side transmission shaft while causing a double mesning by means of a main transmission in case of shifting a second sub-transmission through stopping of a car body, and preventing shifting of a main clutch to a transmission side when the corresponding hydraulic clutch is not in an interruption state. CONSTITUTION: In order to perform transmission operation by means of a shift member 43 of a second sub-transmission device 12 through a transmission lever 28, all hydraulic clutches of a main clutch and a first sub-transmission device are driven to the transmission interruption side. Simultanenously, two or more hydraulic clutches of a main transmission device are driven to the transmission side. A double meshing (multiple transmission) state is generated by the main transmission device where transmission ratios are differentiated in two or more hydraulic clutches for controlling. In case that the hydraulic clutches under a double meshing state are not shifted to the transmission interruption side unil a specified time passes, operation of the main clutch to the transmission side is prevented and an alarm is started.</p> |
