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:
Nov. 18, 2003
Filed:
Dec. 03, 2001
Yosei Kodama, Osaka, JP;
Yukio Takashima, Osaka, JP;
Toyo Tire & Rubber Co., Ltd., Osaka, JP;
Abstract
In a hydraulic antivibration device for use in supporting a vibratory body like an automobile engine, the invention enables it to enhance the dimensional precision of an orifice for shake vibration, to decrease the dispersion in characteristics, and to reduce the dynamic spring rate in a high frequency region thereby reducing noise such as muffled sound. Its expedient is in that a main liquid chamber ( ) and a first subsidiary liquid chamber ( ) are mutually brought into communication through a first orifice ( ), a partition element ( ) comprises a partition plate member ( ) including an elastic membrane ( ) and an orifice member ( ), the first orifice ( ) is formed by outer circumferences of the orifice member and partition plate member and a cylindrical rubber portion ( ) linking to a diaphragm, a space enclosed by a central plate section ( ) of the orifice member and the elastic membrane ( ) is formed as a second subsidiary liquid chamber ( ), and an opening as a second orifice ( ) for muffled sound communicating from the first ( ) to the second liquid chamber ( ) is formed in the central plate section ( ).