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:
May. 25, 2010
Filed:
Dec. 12, 2007
Kimio Koizumi, Isehara, JP;
Kimio Koizumi, Isehara, JP;
Zama Japan Kabushiki Kaisha, , JP;
Abstract
The present invention provides an internal shape of a rotor for a two-bore rotary carburetor used in a stratified scavenging engine whereby an engine for a power saw, lawn mower, or the like can be stabilized in the course of a complete change in orientation during idling. A groove pocket () in communication with a fuel supply-side bore () is formed at the aperture edge of each of the upstream end and the downstream end of a carburetor rotor valve () toward an accelerated rotation direction in the fuel supply-side bore () of the rotor valve (). The groove pocket () is shaped so as to gradually rise and decrease in cross-sectional surface area toward the accelerated rotation direction along a peripheral surface of the rotor valve (). The resulting structure is one in which the groove pocket () is initially superposed with the mixing channel during horizontal rotation of the rotor valve (), the fuel supply-side bore () and the mixing channel are in communication with each other, and the fuel supply-side bore () opens before the air supply-side bore () does.