| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a hydraulic device to prevent direct entrance of foreign matters into working oil from an external part and prevent leakage of the working oil to the outside of a device. SOLUTION: A ventilation hole 4N to intercommunicate an oil tank 2 and a machine room 1 is formed in a partition wall W by which an oil tank 2 and the machine room 1 are separated away from each other and a cylindrical oil return member R is protruded from the partition wall W on the oil tank 2 side. Thus, a need to use a conventional breather hole is eliminated, direct entrance of the foreign matters into the oil tank 2 is prevented from occurring, and the opening and closing structure of an oil feed opening 5N is simplified.</p> |
