| 摘要 |
<p>PURPOSE:To prevent the generation of a sudden change of the front wheel driving force at the time of speed change, and to enable the smooth traveling by disconnecting a clutch at the time of speed change so that the output side and the front wheels are not connected, and connecting the clutch after performing the speed change. CONSTITUTION:When a transmission 9 is operated to change the speed, the speed change starting signal and the speed change finishing signal are input from a speed stage detecting sensor 20 to a main controller 23. When the speed change starting signal is input to the main controller 23, the main controller 23 stops the current supply to a solenoid 30a of a clutch switching valve 30. Then, the clutch switching valve 30 is positioned at a drain position (a), and the pressure oil is flowed out to disconnect a clutch 14. When the speed change finishing signal is input to the main controller 23, current supply to the solenoid 30a is started after a predetermined time, and the clutch switching valve 30 is positioned at a supplying position (b) to connect the clutch 14, and the output side and the front wheels 2 are connected. Even in the case where the engine speed of an engine 7 is changed at the time of speed change, the front wheel driving force is not changed suddenly to perform the smooth traveling.</p> |
