| 摘要 |
PROBLEM TO BE SOLVED: To provide a new over-rotation prevention device of a hydraulic motor capable of preventing over-rotation of other hydraulic motors even when partial hydraulic motors fail.SOLUTION: A device for preventing over-rotation of a plurality of hydraulic motors 50 rotationally driven by pressure oil delivered from a single variable displacement hydraulic pump 20 includes a controller 80 for controlling a discharge flow rate of the pressure oil from the hydraulic pump 20 to be reduced when pressure of pressure oil supplied to the hydraulic motor 50 is set higher than pressure in ordinary rotation drive of the hydraulic pump 20. When any partial hydraulic motors 50 fail, a discharge flow rate of the pressure oil in that part is reduced, and thereby over-rotation of the other hydraulic motors 50 can be prevented. |
