Patent ID: 8172209

Claim:
A fluid filled type vibration damping device comprising: a rubber elastic body elastically connecting a first mounting member and a second mounting member; a partition member supported on the second mounting member; a pressure-receiving chamber whose wall is partly defined by the rubber elastic body; an equilibrium chamber whose wall is partly defined by a flexible film; the pressure-receiving chamber and the equilibrium chamber being formed to either side of the partition member and filled with a non-compressible fluid; a first orifice passage connecting the pressure-receiving chamber and the equilibrium chamber; an oscillating plate defining another part of the wall of the pressure-receiving chamber; and an electromagnetic actuator for actuating oscillation of the oscillating plate, wherein the oscillating plate is constituted by including a cylinder shaped hole having a round tubular inside peripheral face formed in the partition member, and a piston shaped plate accommodated within the cylinder shaped hole with a gap provided between an outside peripheral face of the piston shaped plate and the inside peripheral face of the cylinder shaped hole so that the piston shaped plate is axially displaceable within the cylinder shaped hole, an output member of the electromagnetic actuator is passed through the flexible film and linked to the piston shaped plate, a plate spring extending in an axis-perpendicular direction is disposed to an opposite side from the electromagnetic actuator with the piston shaped plate therebetween, with the oscillating plate being elastically linked to and supported in an axial direction with respect to the partition member by the plate spring, and the oscillation plate is supported at both sides of a center axis thereof such that the oscillating plate at a first side thereof in an axial direction is positioned and supported in an axis-perpendicular direction by an output member of the electromagnetic actuator, and another side thereof in the axial direction is positioned and supported in the axis-perpendicular direction by the plate spring.