Patent ID: 6276673
Filing Date: 2001-08-21
Classification: F16F

Abstract:
A fluid-filled active vibration damping device comprising:a first and a second mounting member which are spaced apart from each other;an elastic body which elastically connects said first and second mounting members and which partially defines a fluid chamber filled with a non-compressible fluid;an oscillating member which partially defines said fluid chamber;an electromagnetic actuator for oscillating said oscillating member, so as to control a pressure of said non-compressible fluid in said fluid chamber;a stabilizing member which is disposed on one of opposite sides of said oscillating member that is remote from said fluid chamber, and which is opposed to and spaced apart from said oscillating member in an oscillation direction in which said oscillating member is oscillated by said electromagnetic actuator;a first elastic support through which said oscillating member is elastically supported by said second mounting member, such that said oscillating member is displaceable relative to said second mounting member;a second elastic support through which said stabilizing member is elastically supported by said second mounting member, such that said stabilizing member is displaceable relative to said second mounting member; anda connecting member which connects said oscillating member and said stabilizing member, so as to cooperate with said oscillating member and said stabilizing member to provide a displaceable assembly which is displaceable relative to said second mounting member,wherein said electromagnetic actuator comprises a holder block which is fixed to said second mounting member, a coil which is held by said holder block, and an electromagnetically movable member which is fixed to said oscillating member and is displaceable relative to said coil in an axial direction of said coil, said electromagnetically movable member being displaced by an electromagnetic force generated upon energization of said coil with an electric current applied thereto, for thereby oscillating said oscillating member,and wherein said holder block has a through-hole formed therethrough and extending in said axial direction of said coil in which said electromagnetically movable member is displaceable relative to said coil, and wherein said connecting member consists of a cylindrical rod which has an outside diameter smaller than an inside diameter of said through-hole and which is introduced in said through-hole such that said through-hole and said cylindrical rod are brought in a substantially coaxial relationship with each other, with a predetermined radial spacing distance therebetween, so that said displaceable assembly is displaceable without said cylindrical rod being in contact at an outer circumferential surface thereof with an inner circumferential surface of said through-hole.