Electromagnetic actuator and fluid-filled active vibration damping device using the same

A fluid-filled active vibration damping device comprising:

• a first mounting member disposed spaced apart from an axial opening of a second mounting member having cylindrical shape;
• a main rubber elastic body linking the first mounting member and the second mounting member;
• a pressure-receiving chamber formed therein and a portion of whose wall being defined by the main rubber elastic body;
• an equilibrium chamber a portion of whose wall being defined by a flexible film, the pressure-receiving chamber and the equilibrium chamber being filled with a non-compressible fluid;
• and
• an orifice passage interconnecting the pressure-receiving chamber and the equilibrium chamber, wherein:
• the device comprises an electromagnetic actuator including:
• a stator having a stator magnetic path provided by yoke members attached about a circumference of a coil;
• a movable member disposed in a center hole of the coil, the movable member being actuated in an axial direction of the coil through action of a magnetic field generated by energizing the coil;
• an annular supporting member secured to the stator and an oscillator member secured to the movable member that are disposed in opposition across a gap in an axis-perpendicular direction;
• and a supporting rubber elastic body of annular plate shape disposed between opposing faces of the annular supporting member and the oscillator member in the axis-perpendicular direction, and elastically linking the oscillator member to the annular supporting member, such that the supporting rubber elastic body includes a thin walled portion, and at the thin walled portion, one axial face of the supporting rubber elastic body is furnished with an inside peripheral recessed portion and a first outside peripheral protruding portion while another axial face of the supporting rubber elastic body is furnished with a first inside peripheral protruding portion and an outside peripheral recessed portion;
• another portion of the wall of the pressure-receiving chamber is defined by the oscillator member;
• the annular supporting member is secured to the second mounting member;
• and
• the oscillator member and the annular supporting member are linked by the supporting rubber elastic body.