Spring devices – Resilient shock or vibration absorber – Including energy absorbing means or feature
Patent
1997-09-10
1999-03-09
Schwartz, Chris
Spring devices
Resilient shock or vibration absorber
Including energy absorbing means or feature
1882671, 18832222, 267 6426, F16F 500
Patent
active
058789979
ABSTRACT:
According to one aspect of the invention, a magnetorheological fluid (MRF) damping device includes two concentric coils or groups of coils arranged to produce respective magnetic fields that mutually cancel substantially everywhere but within the gap between them. The rheological properties of the MRF are magnetically controlled within this gap. According to a second aspect of the invention, the piston rod of a MRF damper or other viscous fluid damper communicates its motion to a hollow, capped cylinder. Damping fluid within this cylinder communicates via a narrow channel with damping fluid outside of this cylinder. When the piston rod undergoes motions directed so as to expel fluid from the interior of the cylinder, resistance within the narrow channel causes pressure to build up within the cylinder, but prevents any substantial amount of pressure from building up without the cylinder, thus isolating sealing devices from the highest resistive forces generated within the damping fluid. According to a third aspect of the invention, a piston head for a viscous fluid damper is arranged to pass small-amplitude displacements with reduced damping. A floating piston is disposed in a borehole that passes through the piston head. This borehole provides a low-resistance pathway for fluid flow when piston displacements are relatively small, but the floating piston closes this pathway when piston displacements are relatively large.
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Lucent Technologies - Inc.
Schwartz Chris
LandOfFree
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