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:
Jan. 11, 2000
Filed:
Mar. 09, 1998
Yuji Shimpo, Kanagawa-ken, JP;
Keijiro Iwao, Kanagawa-ken, JP;
Nissan Motor Co., Ltd., Kanagawa-ken, JP;
Abstract
An airflow type sound isolation plate structure comprises two sheets of plate members positioned in parallel at a predetermined interval. One of plate members is arranged on an air inlet side and the other of plate members is arranged on an air outlet side. Plural sets of first opposing holes and plural sets of opposing second holes are provided in two sheets of plate members respectively. Peripheral areas of respective sets of first holes are connected by cylindrical connecting portions so as to form a continuous hole in their internal spaces. Annularly extended portions are provided to peripheral areas of respective sets of second holes so as to oppose to each other and not to contact to each other. Internal spaces are provided around the annularly extended portions between both plate members. Inner peripheral surfaces of the first holes and the second holes formed in one of plate members are expanded gradually toward the upstream side of air flow. As a result, air flow passes through peripheral portions of the holes without separation from the inner peripheral surfaces and therefore the an air permeability is improved much more. In addition, all areas of top inner peripheral surfaces of the annularly extended portions formed in one of plate members are positioned on the inside rather than those of top inner peripheral surfaces of the annularly extended portions formed in the other of plate members. Vortex flows are turned toward the center sides by edge portions of the annularly extended portions following to the holes. As a result, whistling sound is prevented from being generated at portions connected to air chambers.