Importance

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Abstract

A vibration isolator has four fluid filled variable volume load bearing chambers, with two arranged on one side of a core and the other two on the other side. The core and chambers are contained within a frame, with the chambers extending between the core and the frame, so that vibrating the core axially compresses or extends the chambers. Diagonally opposite pairs of chambers are each connected with a separate fluid track, and the two fluid tracks may be tuned to have different resonant frequencies or the same resonant frequency. The chambers are defined by elastomeric bodies which may be reinforced using a tubular shaped reinforcing element adjacent to the chamber, to help contain the pressures within the chamber without materially increasing the compression strength of the elastomeric bodies. A fluid expansion chamber communicates with the fluid envelope of the chambers and tracks through porous flow restriction elements which allow flow to or from the expansion chamber in response to temperature changes of the fluid but snub significant flow to or from the expansion chamber which may otherwise be caused by subjecting the isolator to vibrations.

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First Claim