Patent ID: 7165761
Filing Date: 2007-01-23
Classification: F16F

Abstract:
1. A fluid filled active vibration damping device comprising: a first mounting member; a second mounting member; a rubber elastic body elastically connecting the first and second mounting members; a pressure receiving chamber having a non-compressible fluid sealed therein and undergoing input of vibration, the pressure receiving chamber being defined at one part by the rubber elastic body, and at another part by an excitation plate capable of displacement; an electromagnetic actuating assembly disposed on an opposite side from the pressure receiving chamber with the excitation plate being located therebetween; and an output member; wherein: the excitation plate is subjected to actuating force of the output member actuated by application of electrical current to a coil member in the electromagnetic actuating assembly, thereby exciting the excitation plate in order to control a pressure in the pressure receiving chamber; the output member projects out towards the excitation plate from the electromagnetic actuating assembly, and a permanent magnet is disposed in at least one of the output member and the excitation plate, the permanent magnet generating an attractive magnetic force that couples the output member and the excitation plate; and the permanent magnet is disposed on one of the output member and the excitation plate, and a magnetic member comprising ferromagnetic material is disposed on an other of the output member and the excitation plate, while the output member and the excitation plate are coupled by means of superimposing a magnetic pole produced by the permanent magnet, against the ferromagnetic material.