Fluid-filled vibration damping device

摘要

A fluid-filled vibration damping device including: a pressure-receiving chamber; an equilibrium chamber; a partition member having a communication aperture through which the two chambers communicate; and an elastic rubber plate superposed to cover the communication aperture from a pressure-receiving chamber side. The elastic rubber plate includes one or more contact retaining portions that are provided on an outer peripheral edge thereof and retained in contact against the partition member, and a deformation-allowing region that is provided between circumferentially opposite ends of one or two of the contact retaining portions of the elastic rubber plate and that is elastically deformable based on pressure differential between the two chambers. A gap is formed between the deformation-allowing region and the partition member so that a communication passage is constituted by including the gap through which the two chambers communicate with each other.

主权项

1. A fluid-filled vibration damping device comprising:
a first mounting member; a second mounting member; a main rubber elastic body connecting the first and second mounting members; 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 containing a non-compressible fluid sealed therein; an orifice passage through which the pressure-receiving chamber and the equilibrium chamber communicate with each other; a partition member that separates the pressure-receiving chamber from the equilibrium chamber while having a communication aperture through which the pressure-receiving chamber and the equilibrium chamber communicate; and an elastic rubber plate arranged so as to cover the communication aperture by being superposed thereon from a pressure-receiving chamber side so that pressure in the pressure-receiving chamber is applied to a first surface of the elastic rubber plate while pressure in the equilibrium chamber is applied to a second surface thereof via the communication aperture, wherein the elastic rubber plate includes one or more contact retaining portions that are provided on an outer peripheral edge thereof and retained in contact against the partition member, and a deformation-allowing region that is provided between circumferentially opposite ends of one or two of the contact retaining portions of the elastic rubber plate and that is elastically deformable based on pressure differential between the pressure-receiving chamber and the equilibrium chamber, a gap is formed between the deformation-allowing region and the partition member so that a communication passage is constituted by including the gap through which the pressure-receiving chamber and the equilibrium chamber communicate with each other, and in a static state of the device, the communication aperture is held in communication with the pressure-receiving chamber through the gap.