Internal shape of rotor for two-bore rotary carburetor used in stratified scavenging engine
US7722015B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 12, 2007 |
| Grant date | May 25, 2010 |
| Priority date | — |
| Expiry date | Nov 11, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S261/01
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
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 (10) in communication with a fuel supply-side bore (8) is formed at the aperture edge of each of the upstream end and the downstream end of a carburetor rotor valve (6) toward an accelerated rotation direction in the fuel supply-side bore (8) of the rotor valve (6). The groove pocket (10) 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 (6). The resulting structure is one in which the groove pocket (10) is initially superposed with the mixing channel during horizontal rotation of the rotor valve (6), the fuel supply-side bore (8) and the mixing channel are in communication with each other, and the fuel supply-side bore (8) opens before the air supply-side bore (7) does.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.