Fluid-filled active elastic mount wherein oscillating member is elastically supported by two elastic support members

A fluid-filled active elastic mount interposed between two members of a vibration system comprising:

• a first mounting member and a second mounting member which are spaced-apart from each other, and which are attachable to said two members of the vibration system, respectively;
• an elastic body elastically connecting said first and second mounting members and partially defining a fluid chamber filled with a non-compressible fluid;
• a movable plate partially defining said fluid chamber and being displaceable to change a pressure of said fluid in said fluid chamber;
• and
• an actuator adapted to oscillate said movable plate and constituted by an oscillating force generator including a yoke member made of a magnetic material and having an annular groove open in one of axially opposite end faces thereof such that said yoke member has an inner and an outer circumferential wall portion which are cooperate to partially define said annular groove, a coil disposed in said annular groove of said yoke member, and an oscillating member made of a magnetic material and disposed opposite to said one end face of said yoke member in an axial direction of said yoke member with a predetermined axial distance therebetween, said yoke member being fixedly supported by said second mounting member, while said oscillating member being fixed to said movable plate, to thereby constitute said actuator,
• said coil being energized by an electric current applied thereto, so as to form a magnetic circuit around said coil such that said inner and outer circumferential wall portions of said yoke member are magnetized as respective opposite magnetic poles at open end portions thereof, and so as to generate a magnetic force acting on said oscillating member so that an oscillating force is generated between said oscillating member and said yoke member in said axial direction,
• at least one of said open end portions of said inner and outer circumferential wall portions of said yoke member being directly opposed in said axial direction to an inner and/or an outer circumferential portion of said oscillating member, said inner and outer circumferential portions of said oscillating member being located nearest to said open end portions of said inner and outer circumferential wall portions of said yoke member, respectively,
• said oscillating member having an axial protrusion extending axially outwardly toward said yoke member, said axial protrusion having a predetermined diameter so that said axial protrusion is locatable radially inwardly and/or outwardly of at least the other of said open end portion of said inner and outer circumferential wall portions of said yoke member, and having at least one edge portion which is opposed to said open end portion of said inner and/or outer circumferential wall portions of said yoke member in a direction inclined to said axial direction;
• and
• said oscillating member being elastically supported by a first and a second elastic support member disposed at respective axial positions which are spaced apart from each other in said axial direction, with respect to said respective axial positions on the side of said yoke member.