COOLING FAN DRIVE SYSTEM FOR TRAVEL TYPE WORKING MACHINE

COOLING FAN DRIVE SYSTEM FOR TRAVEL TYPE WORKING MACHINE

It is provided a cooling fan drive device system (21; 21A; 21B) for a travel type working machine including a cooling fan (9) for cooling an engine cooling water, a hydraulic pump (22; 22A) driven by an engine (1), a hydraulic motor (23; 23A) actuated by a hydraulic fluid delivered by the hydraulic...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: NAKAMURA, TSUYOSHI, NAKAMURA, KAZUNORI, ITOGA, KENTAROU
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
BLASTING
COOLING OF INTERNAL-COMBUSTION ENGINES
COOLING OF MACHINES OR ENGINES IN GENERAL
DREDGING
ENGINE PLANTS IN GENERAL
FIXED CONSTRUCTIONS
FOUNDATIONS
HEATING
HYDRAULIC ENGINEERING
LIGHTING
MACHINES OR ENGINES IN GENERAL
MECHANICAL ENGINEERING
SOIL SHIFTING
STEAM ENGINES
WEAPONS
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Beschreibung
Zusammenfassung:It is provided a cooling fan drive device system (21; 21A; 21B) for a travel type working machine including a cooling fan (9) for cooling an engine cooling water, a hydraulic pump (22; 22A) driven by an engine (1), a hydraulic motor (23; 23A) actuated by a hydraulic fluid delivered by the hydraulic pump for rotating the cooling fan, and temperature detecting means (31) for detecting the temperature of the engine cooling water, wherein said cooling fan drive system comprises: rotational speed detecting means (34) for detecting the rotational speed of the engine; and cooling fan control means (24, 35a, 35b, 35c, 35d, 35e, 35f, 35g, 35h; 24, 35a, 35b, 35c, 35d, 35f, 35g, 35h, 35i; 44, 35a, 35b, 35c, 35d, 35e, 35f, 35h, 35j; 54, 35a, 35b, 35c, 35d, 35e, 35f, 35h, 35k) for controlling the rotational speed of the hydraulic motor on the basis of the detection values of the temperature detecting means and the rotational speed detecting means so that the rotational speed of the cooling fan is increased as the temperature of the engine cooling water rises up and the increase of the rotational speed of the cooling fan is limited when the rotational speed of the engine increases. It is an object of the present invention to provide a cooling fan drive device system with an improved functionality. Therefore the rotational speed detecting means (34) has means (34) for detecting the target rotational speed of the engine (1) and means (34) for detecting the actual rotational speed of the engine, and the cooling fan control means (24; 35a, 35b, 35c, 35d, 35f, 35g, 35h, 35i) calculates the fan target rotational speed that increases as the temperature of the engine cooling water rises up, calculates the limiting value of the fan target rotational speed that is lowered as the rotational speed difference between the target rotational speed and the actual rotational speed of the engine increases, corrects the fan target rotational speed so that the fan target rotational speed does not exceed the limiting value, and controls the rotational speed of the hydraulic motor (23) so as to achieve the corrected fan target rotational speed.