TRAVEL TRANSMISSION CONTROL DEVICE FOR AGRICULTURAL TRACTOR FOR SHIFTING GEAR ACCORDING TO SURROUNDING CONDITION WITHOUT FREQUENTLY REGULATING SPEED

摘要

PURPOSE: A travel transmission control device of an agricultural tractor is provided to improve working efficiency and convenience by shifting gears according to the surrounding condition without frequently regulating speed. CONSTITUTION: A travel transmission control device of an agricultural tractor is composed of a main shifting mechanism having the gear position of plural ranges for selecting the motor gear ratio according to the vehicle speed range predetermined within the shifting range by a motor, and a shifting command unit commanding shifting of gear position of the main shifting mechanism. The shifting command unit has an automatic shifting unit for counting the remaining time of the selected gear position during traveling(S7), memorizing the maximum gear position in finishing the vehicle speed range(S11) and commanding shifting of gear position related to the memory in using the vehicle speed range again(S12).