| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve reliability of self-sealing performance of an accumulator by constituting a valve element with an upper surface part for covering an opening, and a plurality of annular protrusive streaks by which the opening is enclosed along its circumference, and which are closely fitted to a circumferential edge of the opening. SOLUTION: When liquid pressure of a passage 8 is reduced due to fluctuation of pulsation, stop, and a load in a pump, a metallic bellows 5 is expanded so as to ensure liquid pressure of the passage 8. When the liquid pressure of the passage 8 is reduced to lower than the inner pressure of an air chamber 3, a valve element 7 is closely fitted to a valve seat 9 to close an opening 8a. Since the valve element 7 is formed into a double structure of a first annular protrusion part 7b of the inside and a second annular protrusion part 7c formed on its outer periphery, one of the annular protrusions 7b, 7c is surely sealed by the other annular protrusion, even if its sealing property is reduced by deterioration due to aging, sandwiching of foreign matter, and the like. Accordingly it is possible to prevent reduction of pressure in the liquid chamber 4, and it is also possible to improve durability without generating stresses on the metallic bellows 5.</p> |
