| 摘要 |
PURPOSE:To prevent leakage of operating oil by providing a second oil duct for reclaiming fluid on the outside of a pocket and a third oil duct having fluid sucking means positioned outside further. CONSTITUTION:Oil pressure discharged from a pump 25 passes through a switching valve 27, a first oil duct 16 and a throttle 17 to a pocket 15. Most of operating oil flowed out from the pocket 15 through a gap 21 is returned to a tank 23 through a second oil duct 18. The operating oil which is leaked out from the second oil duct 18 to a third oil duct 19 positioned outside further is compulsorily sucked by a pump 29 driven by a motor 28 and returned to the tank 23. Therefore, the operating oil is prevented from leaking out from the third oil duct 19 to the outside further. |
