Patent ID: 6352249
Filing Date: 2002-03-05
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 primary fluid chamber filled with a non-compressible fluid; a flexible diaphragm partially defining an auxiliary fluid chamber filled with the non-compressible fluid and whose volume is variable; a first partition wall fixed to said second mounting member and disposed between said primary fluid chamber and said auxiliary fluid chamber; a first orifice passage formed at a central portion of said first partition wall for fluid communication between said primary and auxiliary fluid chamber; and an elastic oscillating plate having an annular or a cylindrical shape and disposed radially outwardly of said orifice passage so as to continuously extend in a circumferential direction thereof, said elastic oscillating plate partially defining said primary fluid chamber on one of opposite sides thereof and an oscillating air chamber on the other side thereof, said oscillating air chamber being applied with periodic change of an air pressure so as to apply to said elastic oscillating plate an oscillating force whose frequency is corresponding to that of vibrations to be damped, whereby said vibration damping device exhibits an active damping effect with respect to said vibrations to be damped.