Diaphragm-type carburetor
US6202988A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1999 |
| Grant date | Mar 20, 2001 |
| Priority date | — |
| Expiry date | Jul 27, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S261/83
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A diaphragm-type carburetor includes a fuel well communicating with a lower end of a fuel nozzle, a constant-pressure fuel chamber communicating with the fuel well through an outlet bore, and a fuel pump incorporated in fuel passages defined between an inlet bore of the constant-pressure fuel chamber and a fuel tank. A fuel introduction control valve controls the introduction of fuel into the constant-pressure fuel chamber. The fuel introduction control valve includes a valve seat member which communicates at its lower end with the fuel well through a bypass passage extending above the constant-pressure fuel chamber. Thus, when fuel vapor is introduced into the constant-pressure fuel chamber, it immediately passes towards the fuel nozzle, whereby the extreme reduction in air-fuel ratio of a fuel-air mixture can be avoided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.