WORKING FLUID COOLING DEVICE OF CONSTRUCTION MACHINE

摘要

PROBLEM TO BE SOLVED: To increase cooling efficiency of working fluid by an oil cooler.

SOLUTION: In an working oil cooling device, an oil cooler 9 for cooling the working oil is disposed to a return oil line 4 of a hydraulic actuator circuit 3, and a fan motor 11 is connected to be in parallel with the oil cooler 9 to drive a blower fan 10 with respect to the oil cooler 9. The fan motor 11 is constituted as a variable displacement type, a motor capacity is automatically controlled depending on an oil temperature detected by an oil temperature sensor 15 by a controller 13 and a regulator 14, in a direction reducing the capacity of the fan motor 11 when an oil temperature is increased.

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