WHEEL EXCAVATOR WITH TRAVEL SPEED MAINTAINING SYSTEM

摘要

A steady speed driving holding unit of the wheel excavator is provided that the electronic proportional valve is controlled and the pressure of the hydraulic oil delivered to the main control valve is preserved. A steady speed driving holding unit of the wheel excavator comprises a running speed maintenance switch(8) connected to the input terminal of MCU(Micro Control Unit)(4) which is installed at the neighboring of the driver's seat. As to the control program inputted to MCU, the pressure of the hydraulic oil delivered to the engine RPM (Revolution Per Minute) and main control valve(3) is sensed when the running speed maintenance switch is turned on. The engine RPM manipulated range of the driving pedal(1) is controlled from the engine maximum RPM within the fixed range.