Cooling fan drive system for travel type working machine

Details Cooling fan drive system for travel type working machine Cooling fan drive system for travel type working machine

2006-10-24

2010-11-30

Kamen, Noah (Department: 3741)

Internal-combustion engines

Cooling

Automatic coolant flow control

C123S041490

Reexamination Certificate

active

07841307

ABSTRACT:
In a cooling fan drive system for a travel type working machine, the rotational speed of a cooling fan is controlled to the optimum rotational speed in accordance with temperature increase of the temperature of an engine cooling water, and the engine rotational speed is smoothly increased when the engine rotational speed is increased under travel acceleration. A fourth fan target rotational speed calculator35eand a minimum value selector35fare provided, and under non-operation, the fan target rotational speed is set to a low rotational speed irrespective of the temperature. When an acceleration pedal12is depressed to increase the rotational speed of the engine under travel acceleration, the increase of the drive pressure of a hydraulic motor23due to increase of the rotation of the cooling fan9is suppressed, and the load on the engine1is reduced.

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