| 摘要 |
A cooling device for construction machinery according to the present invention comprises: at least two hydraulic motors (30a, 30b) for rotating cooling fans (20a, 20b) connected thereto respectively, each motor being able to rotate forwardly/reversely with respect to the feed direction of pressurized oil; a switching valve (40) for changing the rotational direction of the at least two hydraulic motors by switching the direction in which the pressureized oil from a hydraulic pump (60) is fed to the at least two hydraulic motors (30a, 30b); and makeup valves (50a, 50b) for regulating a flow mass being provided additionally upstream of the at least two hydraulic motors (30a, 30b) with respect to the feed direction of the pressurized oil, if the pressure drop occurs in the upstream of the at least two hydraulic motors. |
