Patent ID: 8047513

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 movable member of limited displacement or limited deformation disposed within the pressure-receiving chamber, the pressure-receiving chamber being partitioned by the movable member thereby forming a primary fluid chamber whose wall is partly defined by the rubber elastic body and to which vibration is input, and an auxiliary fluid chamber whose wall is partly defined by an oscillating plate and whose pressure is controllable through actuated oscillation of the oscillating plate; a first orifice passage connecting the primary fluid chamber to the equilibrium chamber; and a second orifice passage connecting the auxiliary fluid chamber to the equilibrium chamber, the second orifice passage being tuned to a higher frequency range than the first orifice passage, wherein a through-hole is formed in the partition member that partitions the auxiliary fluid chamber and the equilibrium chamber, the oscillating plate is housed within the through-hole with a gap provided between an outside peripheral face of the oscillating plate and an inside peripheral face of the through-hole whereby the oscillating plate is displaceable in an axial direction within the through-hole, the wall of the auxiliary fluid chamber is partly defined by the oscillating plate, a stopper abutted by the oscillating plate during displacement to one side in the axial direction is provided, with the gap becoming closed off when the oscillating plate is in a state of abutment against the stopper, and wherein an electromagnetic actuator furnished with a coil member and an output member that receives actuating force through flow of electrical current to the coil member is used as an actuating member for actuating oscillation of the oscillating plate, with the electromagnetic actuator disposed on an opposite side of the oscillating plate from the pressure-receiving chamber, and with the output member penetrating through the flexible film and linked to the oscillating plate.