The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 14, 2000
Filed:
Oct. 27, 1997
Takehiro Okanaka, Kasugai, JP;
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.