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. 08, 2005
Filed:
Mar. 06, 2003
Masaaki Ashida, Yokohama, JP;
Kimiyoshi Nishizawa, Yokohama, JP;
Masaaki Ashida, Yokohama, JP;
Kimiyoshi Nishizawa, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
In an exhaust manifold of a four-cylinder engine four cylinders of which line up in order of cylinder #cylinder #cylinder #and cylinder #temperature rise performance of a manifold catalyst improves by shortening a total length of the exhaust manifold while preventing exhaust gas interference between the cylinders. Therefore, an exhaust manifold branch of cylinder #and an exhaust manifold branch of cylinder #in outward sides of the engine that are not fired in succession are made convergent with its convergence angle θbeing equal to or below 20 degrees to form a first convergent exhaust manifold branch and an exhaust manifold branch of cylinder #and an exhaust manifold branch of cylinder #between the cylinder #and cylinder #that are not fired in succession are made convergent at a minimum distance having a laterally projected shape to form a second convergent exhaust manifold branch. The first and the second convergent exhaust manifold branches are thereafter convergent at a convergence angle θfrom 0 degrees to 20 degrees.