Patent ID: 6592111
Filing Date: 2003-07-15
Classification: F16F

Abstract:
A fluid-filled active vibration damping device comprising:an elastic body elastically deformed due to a vibrational load applied thereto; a pressure-receiving chamber partially defined by said elastic body and filled with a non-compressible fluid; an oscillating rubber plate disposed elastically displaceable; an oscillating fluid chamber partially defined by said oscillating rubber plate and disposed on one of opposite sides of said oscillating rubber plate, while being filled with said non-compressible fluid; a first orifice passage for permitting a fluid communication between said pressure-receiving chamber and said oscillating fluid chamber; and a working air chamber partially defined by said oscillating rubber plate and disposed on an other one of opposite sides of said oscillating rubber plate; wherein an air pressure variation having a frequency corresponding to that of a vibration to be damped is applied from an external area to said working air chamber so as to cause an oscillation of said oscillating rubber plate for actively controlling a pressure of said fluid in said pressure-receiving chamber via said oscillating fluid chamber and said first orifice passage, and wherein a ratio V/Q of a passage volume V of said first orifice passage to a unit flow amount Q of said fluid through said first orifice passage is held within a range of 1-10.