Patent ID: 6315277
Filing Date: 2001-11-13
Classification: F16F

Abstract:
A fluid-filled active vibration damping device mounted on a desired object which is subject to a vibration received from a vibration source, for actively damping said vibration, said vibration having a frequency F and including at least one major component of vibration which has a minimum frequency value F.sub.L, comprising:an elastic body which is elastically deformable by the vibration of said desired object and which partially defines a fluid chamber filled with a non-compressible fluid;an oscillating body which partially defines said fluid chamber;an elastic support member which elastically supports said oscillating body such that said oscillating body is displaceable;an actuator for oscillating said oscillating body, so as to control a pressure of said non-compressible fluid in said fluid chamber;a control device for controlling said actuator by applying thereto a pulse signal whose frequency corresponds to said frequency F of said vibration received from said vibration source; andsaid oscillating body having a natural frequency fa satisfying an inequality, (1/2)F.sub.L <fa<2 F.sub.L.