| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent deterioration of sucking performance of operating oil and occurrence of cavitation in a main hydraulic pump by bleeding operating oil and accumulated air from an air bleed hole of the main hydraulic pump and making them flow into an oil cleaning system without human assistance. <P>SOLUTION: The hydraulic pressure generating device 100 is configured so that the operating oil accumulated in an oil tank 1 is sucked into the main hydraulic pump 4 via an inlet pipe 2, hydraulic pressure is generated and the operating oil is fed to a hydraulic operation part 6, and the operating oil after doing its job in the hydraulic operation part 6 is returned to the oil tank 1 by a return pipe 7. The oil cleaning system 11 having a circulating hydraulic pump 8 and an oil cleaning filter device 9 are provided to the oil tank 1 via a circulating hydraulic pump inlet valve 10. An air bleed hole 4_<SB>1</SB>provided at a portion where air is easily accumulated in the main hydraulic pump 4 is communicated with a suction port of the circulating hydraulic pump 8 of the oil cleaning system 11 by an air bleed pipe 13, and bleeding of air is performed by sucking the operating oil mixed with air from the main hydraulic pump 4 by the circulating hydraulic pump 8. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
