Patent ID: 6902156
Filing Date: 2005-06-07
Classification: F16F

Abstract:
1. A pneumatically operated active 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 vibration to be damped 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 having a volume easily variable; a first orifice passage for fluid communication between said pressure-receiving chamber and said equilibrium chamber; an elastic oscillating plate partially defining said pressure-receiving chamber on one of opposite sides thereof and an oscillating air chamber on an other one of said opposite sides thereof, said elastic oscillating plate being oscillated by a periodic change of an air pressure generated in said oscillating air chamber, so as to actively generate a change of a fluid pressure in said pressure receiving chamber, for actively damping said vibration to be damped based on said change of said fluid pressure in the pressure receiving chamber, and a static pressure control mechanism adapted to substantially statically change said fluid pressure in said pressure receiving chamber, so as to induce a substantially static elastic deformation of said elastic oscillating plate for changing a spring stiffness of said elastic oscillating plate.