Switchable liquid-filled vibration isolating mount

摘要

There is provided a switchable liquid-filled vibration isolating mount that damps each of shaking vibration and idling vibration by opening and closing an orifice, and that maintain a stable and reliable operation for a long period. First and second fixtures are joined together by a vibration isolating base body to form an inner space defined thereby. This inner space is partitioned by a partitioner and first and second diaphragms to form main and sub-liquid chambers that are communicating with each other via inner and outer orifices. A space between the first and second diaphragms is an equilibrium chamber. A space between the second diaphragm and second fixture is a switching chamber into which either of an atmospheric pressure and a reduced pressure is selectively introduced. The inner orifice is an opening of the partitioner. The first diaphragm has in its central portion a valve body that has a projection always inserted in the inner orifice all the time the orifice is opened or occluded.