| 摘要 |
<p>The present invention addresses the problem of making the area of the elastic movable membrane as large as possible to absorb fluctuations in the internal pressure of the main fluid chamber and reduce the dynamic spring constant even when the elastic movable membrane and the relief valve are integrally provided. A pair of parallel straight sections (Q) is provided on opposite portions of an elastic partition member (30) that has a round shape. The area that is surrounded by the pair of straight sections (Q) and a pair of opposing arc sections (P), which are demarcated by said straight sections (Q) on the circumference of the elastic partition member (30), and that includes the center (O) of the elastic partition member (30) configures the elastic movable membrane (32). The relief valve (36) is provided on the portions of the elastic partition member (30) external to the straight sections (Q). Because the elastic movable membrane (32) has a non-circular stadium shape and some portions expand to the arc sections (P), which are on the circumference of the elastic partition member (30), the area has been made as large as possible. Moreover, the relief valve (36) can be provided as a pair at opposing positions with the straight sections (Q) therebetween.</p> |
