Patent ID: 8556239
Filing Date: 2013-10-15
Classification: F16F

Abstract:
1. A fluid filled type vibration damping device comprising: a first mounting member and a second mounting member linked by a main rubber elastic body; a pressure receiving chamber whose wall is partially defined by the main rubber elastic body; and an equilibrium chamber whose wall is partially defined by a flexible film, the pressure receiving chamber and the equilibrium chamber being filled with a non-compressible fluid, and the pressure receiving chamber and the equilibrium chamber communicating with each other through an orifice passage, wherein a partition member that partitions the pressure receiving chamber and the equilibrium chamber is provided with a communication aperture that connects the pressure receiving chamber and the equilibrium chamber, an obstructing rubber elastic plate is superposed against the communication aperture from a pressure receiving chamber side so as to obstruct the communication aperture, and is arranged such that pressure of the pressure receiving chamber acts upon a first face of the obstructing rubber elastic plate while pressure of the equilibrium chamber acts on another face thereof through the communication aperture, a plurality of contact retaining portions that are held in contact against the partition member are arranged circumferentially on an outer peripheral edge of the obstructing rubber elastic plate, an elastic deformation zone is arranged circumferentially between the contact retaining portions adjacently situated on the obstructing rubber elastic plate, so as to undergo elastic deformation on a basis of pressure differential between the pressure receiving chamber and the equilibrium chamber to be spaced away from the partition member to cause the communication aperture to open up, and a non-linearizing member is provided to endow non-linear elastic characteristics on the elastic deformation zone of the obstructing rubber elastic plate such that the elastic characteristics become more rigid in a non-linear manner in association with increase in an amount of elastic deformation of the elastic deformation zone.