| 摘要 |
PURPOSE:To enable the vibration in a wide frequency range to be absorbed by providing a pair of liquid chambers arranged on an opposite side via an inner cylinder and a plurality of auxiliary chambers which thin wall portions on an elastics body between the restricted conduits communicating the liquid chambers and each liquid chamber formed within the elastic body. CONSTITUTION:When vibration is shake vibration or roll vibration of low frequency and large amplitude, the vibration is absorbed by passing resistance against the liquid in one side liquid chamber, moving to the other side liquid chamber through a restriction passage 30 owing to a pressure increase in the one side liquid chamber 22 or 24. Although the thin wall portion 36 on the pressure rise side is deformed during this vibration, it makes only an auxiliary chamber 32 or 34 come into close contact, so the sufficient pressure change rate for passing through the restriction passage 30 can be secured. When the vibration has a high frequency and a very small amplitude, the liquid within the restriction passage 30 is put in plugged condition, however, the pressure rise within the liquid chamber 22, 24 is restricted by making the thin wall portion 36 to be deformed elastically through the vibration of very small amplitude and the deformation rate to the degree of placing the auxiliary chambers 32, 34 into contact can be never produced because of the very small amplitude. Consequently, the vibration across a wide frequency range can be absorbed. |
