| 摘要 |
PURPOSE:To prevent transmission of vibration in a wide range by a simple and compact structure. CONSTITUTION:A main fluid chamber A and subfluid chambers B, C, connected respectively by flow paths 41, 51 with rubber films 2, 3 serving as a chamber wall, are formed in a vibro-isolating rubber unit 1 for supporting an engine. Fluid resonance is generated at a low frequency in the flow path 41 and at a high frequency in the flow path 51. A stopper plate 9 for limiting deformation upward of the rubber film 3, at the time of applying a static load, is provided, and an air chamber 61 is formed below the rubber film 3 and selectively conducts to the atmosphere and a negative pressure source 73 by a three-way solenoid valve 72. In the case of inputting idling vibration of high frequency, the pressure chamber 61 communicates with the atmosphere, and the rubber film 3 is freely deformed to absorb vibration by the fluid resonance in the flow path 51. In the case of inputting shake vibration of low frequency, the air chamber 61 is exhausted, and the rubber film 3 closely adheres to the wall of a bottom plate 6 to damp the vibration by the fluid resonance in the flow path 41 connected to the subfluid chamber B. |
