| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hydraulic operation device which can extend the replacement time of hydraulic oil by suppressing the occurrence of jelly-like foreign matter in the hydraulic oil contained in an open hydraulic oil tank. <P>SOLUTION: The hydraulic oil tank 13 is formed in an open type which stores the hydraulic oil to be supplied to a hydraulic drive part 11 and which has a vent hole 16 for sucking and discharging air according to a change in the level of the hydraulic oil 12 to be supplied to the hydraulic drive part 11. A pump 14 supplies the hydraulic oil from the hydraulic oil tank 13 to the hydraulic drive part 11. A bag-like partition wall 15 formed in the hydraulic oil tank 13 is attached airtight to the vent hole 16 of the hydraulic oil tank 13. Since the surface of the partition wall 15 on the vent hole 16 side is brought into contact with the outside air and the surface thereof on the hydraulic oil tank 13 side is brought into contact with the hydraulic oil 12, the moisture of the outside air is prevented from being sucked through the vent hole 16 and mixed with the hydraulic oil 12. <P>COPYRIGHT: (C)2012,JPO&INPIT |
