SPEED CHANGE CONTROL MECHANISM FOR TRACTOR

摘要

PURPOSE:To change speed without shock and efficiently control a tractor when a hydraulic clutch type transmission is operated to shift between high and low speed by increasing or decreasing engine speed by the portion corresponding to speed change ratio of the high and low shift steps. CONSTITUTION:An engine E is arranged inside a bonnet on the front part of a tractor, and an electronic governor mechanism A is provided along the side of the engine E. An accelerator lever 14 and an accelerator lever sensor 5 are arranged by the side of a steering handle. A clutch pedal 27 is provided on the position under the steering handle, and a stroke detector 26 is provided on the clutch pedal. A forward and backward changeover device and high and low speed changeover device constituted by a hydraulic clutch type transmission are arranged inside a transmission case M. At operating the hydraulic clutch type transmission to shift between high and low speed, the engine speed is increased or decreased by the portion corresponding to speed change ratio of the high and low shift steps.