| 摘要 |
PURPOSE:To enable vibration absorption over a wide frequency by forming a gas layer with a plastic sheet on a sectioning member sectioning a liquid chamber and enabling expansion and contraction by deformation of the plastic sheet. CONSTITUTION:An upper bulkhead board 24 sections a liquid chamber 22 into an upper liquid chamber 22A and a lower liquid chamber 22B as a sectioning member, and constitutes an orifice 30, a limit passage with a lower bulkhead board 26. The upper bulkhead board 24 is made of an elastic plastic board and the lower bulkhead board 26 is made a reinforced plastic board, and an air chamber 38 formed on the superposed portion of both the bulkhead boards is expanded and contracted by deformation of the elastic plastic board. Then, high frequency vibration is absorbed, and dynamic spring constant cannot be increased. |
