| 摘要 |
PROBLEM TO BE SOLVED: To prevent the creation of negative pressure in a liquid container for a pressure medium of a hydraulic device due to pressure fluctuation in the liquid container by providing the pressure container with a means for compensating pressure between the atmospheric pressure and pressure in the liquid container, and a means for compensating the volume difference of the pressure medium, separately from each other. SOLUTION: This liquid container 1 for supplying an internal pressure medium 2 to a hydraulic device through a conduit 8 and receiving an excess pressure medium and bubbles has a casing 1a closed with a cover 5. A bellows 3 for compensating the difference of two pressure levels of the pressure medium is provided in the container 1, and a gas permeable diaphragm 4 is fitted to the end face 11 of the bellows 3. An inner chamber 9 functioning as an air cushion 10 is partitioned by the bellows 3 and diaphragm 4. The diaphragm 4 is pressed by the air cushion 10 until coming in contact with the pressure medium 2, and when the pressure of the pressure medium 2 rises, pressure fluctuation is absorbed by the deformation of the bellows 3.
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