Patent ID: 7198257

Claim:
A fluid-filled vibration damping device comprising: a first mounting member; a second mounting member; a rubber elastic body elastically connecting the first and second mounting member, and partially defining a pressure-receiving chamber filled with a non-compressible fluid whose pressure is varied upon application of vibration between the first and second mounting member; a flexible layer partially defining an equilibrium chamber filled with the non-compressible fluid and whose volume is changed due to deformation of the flexible layer; an orifice passage permitting a fluid communication between the pressure-receiving chamber and equilibrium chamber; and a cushion surface situated opposite to an opening of the orifice passage to the pressure-receiving chamber in a first direction of flow of the fluid into and out of the opening, with a predetermined distance therebetween, while extending in a second direction approximately perpendicular to the first direction; wherein the orifice passage is partially defined by a partition member fixedly supported by the second mounting member such that the partition member is disposed between the pressure receiving chamber and the equilibrium chamber, the orifice passage circumferentially extending an outer circumferential portion of the partition member and being tuned so that the vibration damping device exhibits a damping performance with respect to low frequency vibrations based on flow action of the fluid flowing through the orifice passage; the cushion surface is defined by a member separate from the rubber elastic body elastically connecting the first and second mounting member, and fixedly supported by the second mounting member directly or indirectly; the cushion surface has a size large enough to spread over an entire of the opening of the orifice passage as seen in the first direction; and the cushion surface is disposed within the pressure receiving chamber so as to be opposite to the opening of the orifice passage to the pressure-receiving chamber from a pressure receiving chamber side, wherein the orifice passage is directly open to the pressure-receiving chamber without interposing a dilatation region formed by an open end portion of an other orifice passage to the pressure receiving chamber, which region has a cross section greater than that of the orifice passage.