Patent ID: 9341227
Filing Date: 2016-05-17
CPC Classification: F16F

Claim Text:
1. A fluid-filled 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 partition member supported by the second mounting member; a pressure-receiving chamber whose wall portion is partially defined by the main rubber elastic body; an equilibrium chamber whose wall portion is partially defined by a flexible film, the pressure-receiving chamber and the equilibrium chamber being disposed on either side of the partition member and filled with a non-compressible fluid; an orifice passage through which the pressure-receiving chamber and the equilibrium chamber communicate with each other; a housing space formed within the partition member; a movable member housed in the housing space with liquid pressure of the pressure-receiving chamber applied to one side of the movable member and liquid pressure of the equilibrium chamber applied to another side of the movable member through communication holes formed in walls of the housing space respectively on sides of the pressure-receiving chamber and the equilibrium chamber; and an elastic buffer body supported by the partition member and arranged in the housing space such that the elastic buffer body is held in contact with both of wall inner surfaces of the housing space on the sides of the pressure-receiving chamber and the equilibrium chamber so that the inner surfaces are covered by the elastic buffer body, wherein windows are formed to penetrate the elastic buffer body at portions corresponding to the communication holes so that the communication holes formed in the respective walls on the sides of the pressure-receiving chamber and the equilibrium chamber are always narrowed by the windows of the elastic buffer body, and a ratio (a/l) of an opening area (a) of the windows to a penetration length (l) thereof is made smaller than a ratio (A/L) of an opening area (A) of the communication holes to a penetration length (L) thereof.