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. 03, 2015
Filed:
Aug. 08, 2012
Takamasa Otsuji, Tokyo, JP;
Buhei Kobayashi, Kanagawa, JP;
Takamasa Otsuji, Tokyo, JP;
Buhei Kobayashi, Kanagawa, JP;
Yamabiko Corporation, Tokyo, JP;
Abstract
It is intended to effectively prevent blow-by with no need for large changes in typical structures of two-cycle internal combustion engines. A main scavenging passage () for supplying air-fuel mixture from a crankcase to a combustion chamber for scavenging purposes has a branch scavenging passage () that extends upward aslant toward an intake port (). The main scavenging passage () communicates with a first scavenging port () located nearer to an exhaust port (). The branch scavenging passage () communicates with a second scavenging port (). A mean cross-sectional area of the branch scavenging passage () is smaller than that of the main scavenging passage (). Cross-sectional area of a portion () next to an inlet port () of the main scavenging passage () opening to the crankcase is smaller than the sum of cross-sectional areas of the first and second scavenging ports ().