| 摘要 |
A tractor transmission includes a pair of dual power clutches that connects an engine to an input shaft through a gearset that selectively makes a direct connection or overdrives the input shaft in accordance with the stat of the clutches. Two nonsynchronized couplers connect the input shaft in accordance with the movement of the gear shift lever by the vehicle operator to high speed and low speed forward gear ratios and to a reverse drive mechanism. Hydraulically actuated disk clutches located in the driveline between the couplers and the drive wheels are selectively operated to transmit power through a multiple speed ratio gearset. A friction clutch or torque converter transmits power from the power source to the input of the dual power clutches. A hydraulically-actuated brake holds a gear and countershaft, located between the couplers and the dual power clutches. A clutch pedal is depressed by the operator.
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