Patent ID: 7188830
Filing Date: 2007-03-13
Classification: F16F

Abstract:
1. A fluid-filled active damping apparatus comprising: a first mounting member; a second mounting member; a rubber elastic body elastically connecting the first and second mounting members; a pressure receiving chamber filled with a non-compressible fluid, whose wall is partially defined by the rubber elastic body, and subjected to input of vibration; an equilibrium chamber filled with the non-compressible fluid, whose wall is partially defined by a flexible diaphragm to readily permit change in volume; an oscillation plate defining an another portion of the wall of the pressure receiving chamber, and elastically supported so to be capable of displacement, the oscillation plate being excited by an actuator for pressure control of the pressure receiving chamber; a partition member fixedly supported on the second mounting member to divide the pressure receiving chamber, forming to either side of the partition member a primary fluid chamber situated on the rubber elastic body side and an auxiliary fluid chamber situated on the oscillation plate side, the primary fluid chamber and the auxiliary fluid chamber being held in communication with each other through a communication hole formed in the partition member; and an orifice passage being provided connecting the primary fluid chamber and the equilibrium chamber to each other, wherein the partition member includes: an upper divider plate and a lower divider plate superposed on each other, with the communication hole being formed in combination with at least one upper through hole provided in the upper divider plate and at least one lower through hole provided in the lower divider plate; and a movable plate of size extending entirely across between opposing faces of the upper and lower through holes, being disposed between the upper divider plate and the lower divider plate, wherein a plurality of elastic projections that project to both sides of the movable plate from an outer peripheral portion of a first and a second face of the movable plate, so as to be spaced apart from one another on a circumferential direction of the movable plate, these elastic projections being held sandwiched between the upper divider plate and the lower divider plate so that the first face of the movable plate is exposed to the primary fluid chamber through the upper through hole and the second face of the movable plate is exposed to the auxiliary fluid chamber through the lower through hole, whereby when a pressure difference between the primary fluid chamber and the auxiliary fluid chamber is exerted across the movable plate, the movable plate undergoes displacement between the upper divider plate and the lower divider plate, wherein the upper through hole or the lower through hole is blocked off by the movable plate by means of the movable plate coming into contact with the upper divider plate or the lower divider plate, and a resonance frequency of fluid induced to flow through the upper and lower through holes in association with displacement of the movable plate is established at a frequency equal to or above that of vibration targeted for damping by pressure control of the pressure receiving chamber by means of excitation actuation of the oscillation plate, and wherein a connecting gap is formed between the upper and lower divider plates and the peripheral portion of the movable plate where the elastic projections have not been formed, to connect the primary fluid chamber and the auxiliary fluid chamber to each other through the upper and lower through holes and the connecting gap.