| 摘要 |
PURPOSE:To reduce vibration even when vibration is generated in a wide range frequency band. CONSTITUTION:An elastic body 16 is fitted between a top plate 18 and a support cylinder 14 connected to a bottom plate 10. In the top plate 18 and the support cylinder 14, a main liquid chamber 26 and a first auxiliary liquid chamber 28, which are partitioned by a partition wall member 42, are formed. At an upper part of the partition wall member 42, a second auxiliary liquid chamber 30 isolated from the main liquid chamber 26 by a membrane 48 is provided. A first orifice 44 for communicating the main liquid chamber 26 with the first auxiliary liquid chamber 28 is formed in an outer periphery of the partition wall member 42. A second orifice 52 for communicating the first auxiliary liquid chamber 28 with the second auxiliary liquid chamber 30 is arranged on the underneath side of the partition wall member 42. The second orifice 52 is shorter in length and larger in a cross sectional area than the first orifice 44. |
