Fluid-filled elastic mount having vacuum-receiving chamber and auxiliary air chamber for accommodating volumetric change of equilibrium chamber

摘要

A fluid-filled elastic mount including first and second support members and an elastic body interposed between these support members for elastically connection thereof. The elastic mount has a pressure-receiving chamber partially defined by the elastic body, first and second equilibrium chambers defined by first and second flexible diaphragms and communicating with the pressure-receiving chamber through first and second orifice passages, respectively, and a vacuum-receiving chamber which is separated by the second diaphragm from the second equilibrium chamber. In operation, the vacuum-receiving chamber is selectively subjected to a sub-atmospheric pressure or exposed to the atmosphere to control the elastic deformation of the second diaphragm. The elastic mount further has an auxiliary air chamber which cooperates with the vacuum-receiving chamber to accommodate a volumetric change of the second equilibrium chamber when the vacuum-receiving chamber is exposed to the atmosphere.