| 摘要 |
The invention provides a control type liquid-sealed vibration-proof device, with which to reduce dynamic spring rate in wide-ranging frequency bands and obtain stable product characteristics by bringing a membrane facing a switchover chamber into stepwise contact with a wall surface to put into constraint. To that end, between a vibration-insulating base (2) and a diaphragm (4) connected through a main body fitting (1), a partition division (10) including a partition proper (15), a partition plate (16), and a partition-bearing bottom plate (17) is fitted, to compart the interior into a main liquid chamber (7) and a first subsidy liquid chamber (8). On the main liquid chamber side of the partition proper (15) having therein a first orifice (13), a membrane (11) is disposed to form a switchover chamber (12) capable of changing over the introduction of a negative pressure and the atmospheric pressure, and a second subsidiary liquid chamber (9) and a second orifice (14) are formed by pressing the peripheral portion of membrane (11) with the partition plate (16). The wall surface (20) of the switchover chamber (12) facing the membrane (11) is provided with steps so that by the introduction of negative pressure into the chamber the membrane (11) may come, from its outer periphery stepwise, into contact with the wall surface to be constrained. |
