Patent ID: 8191876

Claim:
A fluid-filled type vibration damping device comprising: a first mounting member secured to a primary vibration system; a second mounting member secured to a vehicle body and having a cylindrical portion, the first mounting member being positioned spaced apart from a first opening of the cylindrical portion of the second mounting member; a main rubber elastic body elastically linking the first mounting member and the second mounting member; a pressure-receiving chamber in which part of a wall is constituted by the main rubber elastic body and filled with a non-compressible fluid; a flexible film being arranged so as to cover an outside of the main rubber elastic body, forming an equilibrium chamber filled with the non-compressible fluid to an opposite side of the main rubber elastic body from the pressure-receiving chamber; a low-frequency orifice passage and a high-frequency orifice passage which are tuned to mutually different frequency ranges are formed to connect the pressure-receiving chamber and the equilibrium chamber; a cover member closing off another opening of the cylindrical portion of the second mounting member to form the pressure-receiving chamber between opposing faces of the cover member and the main rubber elastic body; a first moveable member that limits a fluid flow amount being disposed on a fluid channel through the high-frequency orifice passage, with the first moveable member being supported by a first support member that is elastically linked to the second mounting member via the main rubber elastic body; and a fluid channel through the low-frequency orifice passage being situated away from the placement location of the first moveable member; a medial support member attached to the main rubber elastic body in a medial section of the main rubber elastic body in a direction of linking the first mounting member and the second mounting member such that the medial support member extends so as to encircle an outer perimeter of the first mounting member; and a middle chamber filled with a non-compressible fluid and formed between the first moveable member and the first mounting member, wherein the first moveable member is supported by the medial support member, the pressure-receiving chamber is formed between the first moveable member and the cover member, and the pressure-receiving chamber and the equilibrium chamber communicate by the high-frequency orifice passage via the middle chamber.