Carburetor for stratified internal combustion engine

摘要

A carburetor for an internal combustion engine of the stratified combustion type supplies a rich air-fuel mixture in the neighborhood of the ignition plug in each cylinder and a lean air-fuel mixture in the remaining space in the cylinder. The carburetor comprises an air horn, a fuel jet having a nozzle open to the air horn, and main and auxiliary ducts branching from the air horn downstream of the fuel nozzle and extending parallel to each other. Air-fuel mixture produced from both air introduced into the air horn and fuel supplied from the fuel jet is led to both the main and auxiliary ducts. At this time, the rich air-fuel mixture is collected in the auxiliary duct, which is closer to the fuel nozzle, and lean air-fuel mixture is collected in the main duct, which is spaced further from the fuel nozzle. The main and auxiliary ducts are respectively provided with main and auxiliary throttle valves, which are controlled by the accelerator pedal.