| 摘要 |
PURPOSE:To obtain characteristics in high and low frequency range by providing a communicating passage giving small resistance to between two fluid chambers and a communicating passage giving large resistance thereto and by disposing a movable plate interrupting the latter communicating passage at the time of low frequency vibration on the passage. CONSTITUTION:A rubber elastic body 4 is fit between an inner cylinder metal fitting 2 and an outer cylinder metal fitting 6, and two fluid chambers 46, 46 are formed in the elastic body 4. The fluid chambers 46, 46 are communicated each other by a first communicating passage 48 and a second communication passage 50 formed by a circular arc orifice member 8. The first communicating passage 48 is formed to large resistance relatively and the second communicating passage give 50 is formed to give small resistance relatively. And a movable plate 36 is provided so as to interrupt the communicating passage 50 when a large displacement vibration of low frequency is generated. |
