Patent ID: 7494115

Claim:
A fluid-filled type vibration damping device comprising: a first mounting member; a second mounting member; a main rubber elastic body elastically connecting the first and second mounting members; a primary fluid chamber whose wall is partially constituted by the main rubber elastic body; an equilibrium chamber whose wall is partially constituted by a flexible film, a partition member supported by the second mounting member such that the primary fluid chamber and equilibrium chamber are formed to either side thereof; a partition rubber film of generally disk shape having a tubular fitting member vulcanization bonded to an outer circumferential surface thereof, the tubular fitting member being superimposed against a center of a primary-fluid-chamber-side face of the partition member and secured interlocking with an annular interlocking projection projecting from the partition member with a lower open end portion thereof fitting externally onto the interlocking projection; a first seal rubber is compressed between an outer circumferential surface of the interlocking projection and an inner circumferential surface of the tubular fitting member and extending about an entire circumference, thereby forming a working air chamber between opposite faces of the partition member and the partition rubber film; and an annular orifice member is superimposed against an outer circumferential portion of the partition member from a primary fluid chamber side, the partition member and the orifice member forming a first orifice passage through which the primary fluid chamber and the equilibrium chamber communicate with each other, wherein a gap is furnished between an outer circumferential surface of the tubular fitting member and an inner circumferential surface of the orifice member, and a second seal rubber is compressed between the tubular fitting member and the orifice member, and extending about an entire circumference, wherein the second mounting member is fit securely to an outer circumferential surface of the orifice member by means of a diameter constriction process, and the outer circumferential surface of the tubular fitting member has a diameter dimension smaller than a diameter dimension of the inner circumferential surface of the orifice member so that the gap is formed therebetween in the diametric direction.