To provide a simple and low-cost oil cooling device by providing an air blower relative to a radiator provided in an oil circuit.
A radiator 27 is provided in a suction side of a fan 31 as an air blower covered with a ventilation cover 32, the fan 31, the ventilation cover 32, and an electric motor 34 constitute a fan unit 35, and this is freely detachable/attachable in a connecting part 36 of the radiator 27. The temperature of the operating fluid is increased by controlling the direction of operating fluid discharged from a hydraulic pump 14 by a switch valve 18 and operating the hydraulic actuator 22 so that the fresh cooling air is fed through ventilation clearance of the radiator 27 by the suction force of the fan 31 rotated by the electric motor 34 to cool the radiator 27. On the other hand, the operating fluid returning to a tank 12 from the switch valve 18 via the radiator 17 radiates the heat in the fluid by the radiator 27 so that the operating fluid can hold a constant temperature in a range 60-70°C and suppress the temperature rise.
ICHIJO MASAYUKI
TAKAGI MOTOMI
Next Patent: ASSEMBLING METHOD FOR ETCHING THIN PLATE FOR FORMING FLUID MODULE