| 摘要 |
PURPOSE:To attenuate low frequency vibration so as to dispense with dislocation preventing mechanism by providing a main fluid chamber in a supporting elastic body between inner and outer cylinders and forming an auxiliary fluid chamber with a diaphragm separated from the supporting elastic body, and then intercommunicating both fluid chamber to each other through an orifice passage. CONSTITUTION:A supporting elastic body 16 is mounted between an inner cylinder 12 connected to a power unit and an outer cylinder 14 connected to a car body member. A main fluid chamber 60 is provided in a cavity portion 36 of the supporting elastic body 16 and the secondary auxiliary fluid chamber 70 is formed between an upper side plate 46 and a diaphragm 45. Besides, the first auxiliary fluid chamber 64 is formed, separated from the supporting elastic body 16, between a diaphragm 62 and the outside of a groove portion 30. The first vibration attenuating mechanism 66 is composed of the first auxiliary fluid chamber 64, the first orifice passage 54 and the main fluid chamber 60 and the second vibration attenuating mechanism 72 is composed of the main fluid chamber 60, the second orifice passage 56 and the second auxiliary fluid chamber 70. Accordingly, the transmission of the low frequency vibration to a car body can be prevented, while dispersing any dislocation preventing mechanism. |
