| 摘要 |
PURPOSE:To prevent the vibration transmission in a wide range with the simple and compact structure. CONSTITUTION:A main liquid chamber A is formed in a rubber elastic body 1 which sopports an engine. Subliquid chambers B and C which communicate to the main liquid chamber A through flow passages 21 and 22 and have diaphragms 3 and 4 as chamber walls are formed. The long flow passage 21 generates liquid resonance at the low frequency, while the short flaw passage 22 which is branched from the long flow passage 21 generates liquid resonance at the high frequency. An air chamber D is formed under the diaphragm 4, and allowed to selectively communicate to the atmosphere and a negative pressure source 52 by an electromagnetic selector valve 5. When the high frequency idling vibration is inputted, the air chamber D communicates to the atmosphere, and the diaphragm 4 freely deforms, and the vibration is absorbed by the liquid resonance in the flow passage 22. When the low frequency shake vibration is inputted, the air chamber D generates a negative pressure, and the free deformation of the diaphragm 4 is regulated, and vibration attenuation is performed by the liquid resonance in the flow passage 21 which communicates to the subliquid chamber B. |
