Patent ID: 7628254
Filing Date: 2009-12-08
Classification: F16F

Abstract:
1. An apparatus for isolating vibration comprising: a damping device containing a magneto-rheological fluid, and being connected to a first fixture and a second fixture, wherein the second fixture is for being vibrated; means for subjecting the magneto-rheological fluid to a magnetic field flux; the magneto-rheological fluid having a viscosity that varies as a function of the magnetic field flux; a tubular sleeve composed of magnetically impermeable material for shielding the damping device from a least a portion of the magnetic field flux; and means for oscillating the sleeve relative to the damping device, responsive to vibration of the second fixture; the damping device including a plunger having a plunger head immersed in the magneto-rheological fluid; and the magneto-rheological fluid proximate to the plunger head being shielded from the magnetic field flux when the sleeve is stationary and being cyclically exposed to the magnetic field flux when the sleeve oscillates, whereby oscillation of the sleeve enables interaction between the magnetic field flux and the magneto-rheological fluid, to vary the viscosity of the magneto-rheological fluid and produce frequency dependent damping of vibration of the second fixture.