COOLING FAN DRIVE DEVICE FOR TRAVELLING WORKING MACHINE

摘要

PROBLEM TO BE SOLVED: To control rotation speed of a cooling fan to optimal rotation speed according to temperature rise of engine cooling water and smoothly raise engine rotation speed at a time of rise of engine rotation speed in travel acceleration in a cooling fan drive device of a traveling working machine. SOLUTION: A fourth fan target rotation speed operation part 35e and a minimum value selection part 35f are provided. Fan target rotation speed is set to a low rotation speed irrespective of the temperature at a time of non-operation, and increase of drive pressure of a hydraulic motor 23 due to rotation speed rise of the cooling fan 9 is inhibited to reduce load of the engine until engine rotation speed rises to a certain level when an acceleration pedal 12 is stepped on to raise engine rotation speed at a time of travel acceleration. COPYRIGHT: (C)2007,JPO&INPIT