| 摘要 |
PROBLEM TO BE SOLVED: To permit smooth forward/reverse change-over by allowing a forward- reverse hydraulic clutch shifted by a shuttle lever, to be shifted by a clutch pedal, and allowing the hydraulic clutch to be controlled in pressure by the clutch 'in' start action of the clutch pedal when operating a shuttle lever. SOLUTION: Engine power is transmitted to front and rear wheels via a forward-reverse selecting device constituted to alternately select a normal rotation gear and a reverse rotation gear by a forward-reverse hydraulic clutch, and various transmission gears. In controlling the forward-reverse selecting device, a shuttle switch (F, R) is selected by the selecting operation of a shuttle lever 41 to alternately actuate forward side and reverse side solenoid valves 36F, 36R, and an operating fluid controlled to modulated pressure through a solenoid proportional pressure reducing valve 32A is supplied to the forward- reverse hydraulic clutch. Current application to the solenoid proportional pressure reducing valve 32A can be controlled according to the output of a clutch pedal sensor 38 changed in association with the depression of a clutch pedal 37. |
