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. 19, 2013
Filed:
Sep. 09, 2011
Junichi Ishida, Saitama, JP;
Masaaki Negoro, Saitama, JP;
Yosuke Ariga, Saitama, JP;
Takanori Osuka, Saitama, JP;
Tomiyuki Sasaki, Saitama, JP;
Junichi Ishida, Saitama, JP;
Masaaki Negoro, Saitama, JP;
Yosuke Ariga, Saitama, JP;
Takanori Osuka, Saitama, JP;
Tomiyuki Sasaki, Saitama, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
A motorcycle includes an engine configured to expel an exhaust from combustion chambers of cylinders in a cylinder head through exhaust ports. Each of the cylinders is provided with a recessed portion provided in an exhaust passage wall surface in a central portion of an exhaust passage of a corresponding exhaust port. This makes it possible to maintain flow rate and flow velocity of the exhaust gas, and to decrease exhaust loss. As a result, it is possible to increase engine torque by use of a simple structure. In addition, no restriction is imposed on the layout of parts around the engine, because the recessed portions are provided in the exhaust ports.