Patent ID: 6491290
Filing Date: 2002-12-10
Classification: F16F

Abstract:
A fluid-filled vibration damping device comprising:a first and a second mounting member, which are spaced apart from each other; an elastic body elastically connecting said first and second mounting members and partially defining a pressure-receiving chamber, said pressure-receiving chamber being filled with a non-compressible fluid whose pressure is changed upon application of a vibrational load between said first and second mounting members; an easily deformable flexible diaphragm partially defining an equilibrium chamber on one of opposite sides thereof, said equilibrium chamber being filled with said non-compressible fluid and has a volume easily variable; a first orifice passage for fluid communication between said pressure-receiving chamber and said equilibrium chamber; an elastic wall member being elastically displaceable and partially defining said pressure-receiving chamber; a restricting member disposed on one of opposing sides of said elastic wall member, the restricting member being disposed on the side of the elastic wall member opposite to said pressure-receiving chamber, said elastic wall member being pressed onto said restricting member based on elasticity of said elastic wall member when pressures on the opposing sides of the elastic wall member are equal such that said elastic wall member is displaceable away from said restricting member against said elasticity thereof; a working air chamber partially defined by the other side of said flexible diaphragm remote from said equilibrium chamber; and a negative pressure-regulating device adapted to apply different negative pressures to said working air chamber, depending upon frequencies of vibrations to be damped.