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 (10) and a second support structure (12) which are spaced from each other in a load-receiving direction, an elastic body (14) for elastically connecting these structures, and a partition structure (36) supported by the second support structure. The elastic mount has a pressure-receiving chamber (48) partially defined by the elastic body, a first and a second variable-volume equilibrium chamber (52, 56) partially defined by respective flexible diaphragms (50, 54), and a first and a second air chamber (62, 64) for permitting the respective diaphragms to elastically deform. The pressure-receiving chamber communicates with the first and second equilibrium chambers, through respective orifice passages (90, 94) which are tuned to different frequency ranges of vibrations. The present elastic mount includes a pressure control device (68, 74, 76, 78) connected to the second air chamber for changing a pressure in the second air chamber.