Patent ID: 6055317
Filing Date: 2000-04-25
Classification: F16F

Abstract:
A pneumatically operated active vibration damping device comprising:a mounting member attachable to an object whose vibration is to be damped;a mass member elastically connected to said mounting member such that said mass member can be oscillated based on a periodic change of an air pressure in an air chamber connected to an air piping system;an active damping switch valve which is connected to said air piping system and which is operable for selective connection of said air chamber to a vacuum source and an atmosphere, to control a frequency and a phase of an oscillation of said mass member; anda pressure regulating switch valve connected to said air piping system, for alternately connecting and disconnecting said air chamber to and from said vacuum source and/or said atmosphere, so as to regulate a magnitude of said periodic change of said air pressure in said air chamber, for thereby adjusting an amplitude of said oscillation of said mass member.