Fluid-filled elastic mount having two differently tuned orifices selectively utilized for damping or isolating vibrations in different frequency ranges

摘要

A fluid-filled elastic mount including a first support structure and a second support structure which are spaced from each other in a load- receiving direction, an elastic body for elastically connecting these structures, and a partition structure supported by the second support structure. The elastic mount has a pressure-receiving chamber partially defined by the elastic body, first and second variable- volume equilibrium chambers partially defined by respective flexible diaphragms, and first and second air chambers for permitting the respective diaphragms to elastically deform. The pressure-receiving chamber communicates with the first and second equilibrium chambers, through respective orifice passages which are tuned to different frequency ranges of vibrations. The present elastic mount includes a pressure control device connected to the second air chamber for changing a pressure in the second air chamber.