Patent ID: 7276823

Claim:
An active vibration damping device comprising: a first mounting member and a second mounting member, the members attachable respectively to components linked to each other to make up a vibration transmission system; a main rubber elastic body elastically linking the first and second mounting members, defining one portion of a wall of a pressure receiving chamber having a non-compressible fluid sealed therein; an oscillation member defining another portion of the wall of the pressure receiving chamber; a solenoid actuator including: a stator having a coil and a yoke member attached about the coil to form a stator-side magnetic path with a guide hole extending along a center axis thereof; and a movable element positioned inserted into the guide hole of the stator so that actuating force in an axial direction is create between the stator and the movable element by means of supplying electrical current to the coil, the stator of the solenoid actuator being affixed to the second mounting member and the movable element being attached to the oscillation member so as to actively control pressure in the pressure receiving chamber by exciting actuation of the oscillation member, and a magnetic acting force stabilizing portion having a shape that gradually varies in association with axial displacement of the movable element an level of magnetic acting force between a movable element-side magnetic pole forming portion and a stator-side magnetic pole forming portion is disposed on at least one of the movable element-side magnetic pole forming portion where a magnetic pole is produced in the movable element and the stator-side magnetic pole forming portion where a magnetic pole is produced in the stator.