| 摘要 |
PURPOSE:To prevent drastic turning of a vehicle in high speed travelling by providing on a drive shaft a variable torque clutch for reversing the rotation of an axle, and providing a variable throttle valve for adjusting oil pressure operating the clutch and a relief valve interlocked with a speed changing lever. CONSTITUTION:A drive shaft 7 in a transmission case 1 is driven by an input shaft 2 through a reduction gear and change gear group a-f. A variable torque clutch 18 consisting of multiple discs is provided on a reversing drive gear 14 loosely fitting on the shaft 7, and a variable throttle valve 20 interlocked with side clutch levers 25a, 25b to adjust oil pressure is provided between a working hydraulic cylinder 19 and a hydraulic pump 22. Also, a solenoid valve 30 is provided which opens hydraulic circuits of relief valves 28, 29 for regulating the max, pressure in the hydraulic circuit at the high speed position of a speed change lever 34 or the descend position of an operating machine. Thus, safety operation becomes possible. |
