| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic fan drive device for reducing a rotating speed when a radiator has low water temperatures. SOLUTION: The hydraulic fan drive device comprises a hydraulic motor 17 for driving a fan 16, a hydraulic pump 13 for forcibly feeding operating oil absorbed from a tank 11 into the hydraulic motor 17, a bypass line 19 connected between a discharge side oil path 15 of the hydraulic pump 13 and the tank 11 for bypassing the hydraulic motor 17, a control valve 30 provided in the bypass line 19 for controlling the maximum flow amount, and a radiator thermo valve 39 connected to a pilot passage 31 of the control valve 30 for controlling a flow amount in the control valve 30 corresponding to a cooling water temperature in the radiator 20. The radiator thermo valve 29 opens the control valve during low water temperatures for discharge oil to flow into the tank 11, suppressing the rotating speed of the hydraulic motor 17 to be lower independently of the discharge flow amount. The radiator thermo valve 39 closes the control valve 30 during high water temperatures for the discharge oil to flow to the hydraulic motor, increasing the rotating speed of the hydraulic motor. COPYRIGHT: (C)2006,JPO&NCIPI
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