Spring devices – Resilient shock or vibration absorber – Including energy absorbing means or feature
Patent
1997-10-27
2000-03-14
Graham, Matthew C.
Spring devices
Resilient shock or vibration absorber
Including energy absorbing means or feature
F16F 500
Patent
active
060361824
ABSTRACT:
A fluid-filled cylindrical vibration damping device comprising: an inner sleeve; an outer sleeve disposed radially outwardly of the inner sleeve; an elastic body interposed between the inner and outer sleeves; a pressure-receiving chamber partially defined by the elastic body; a first flexible diaphragm partially defines a first equilibrium chamber; a second flexible diaphragm partially defines a second equilibrium chamber; a first orifice passage which permits fluid communication between the pressure-receiving and first equilibrium chambers; for defining a second orifice passage which permits fluid communication between the first and second equilibrium chambers; the second orifice passage having a ratio A/L which is smaller than that of the first orifice passage, wherein A and L are a cross sectional area and a length of each orifice passage, respectively, and wherein the fluid flowing in the first orifice passage has a first resonance frequency f1 while the fluid flowing in the second orifice passage has a second resonance frequency f2 which is higher than the first resonance frequency f1.
REFERENCES:
patent: 4749173 (1988-06-01), Kanda
patent: 4936555 (1990-06-01), Ishiyama et al.
patent: 5213313 (1993-05-01), Tsutsumida et al.
Graham Matthew C.
Talavera Melanie
Tokai Rubber Industries Ltd.
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