Air-valve type carburetor

A carburetor for a vehicle internal combustion engine, comprising:

• a curburetor body having an induction duct passing therethrough in which the induction duct contains a cylindrical longitudinal section of a desired radius with an enlarged segment defining a mixing chamber having a peripheral wall with a larger radius then the cylindrical section;
• a fuel delivery means communicating with the mixing chamber haaving a plurality of fuel nozzles at angularly spaced fuel discharge locations about the peripheral wall for delivering metered amounts of fuel to the mixing chamber at the angularly spaced locations;
• wherein the fuel delivery means includes (1) a fuel reservoir vented to the atmosphere, (2) a fuel well in liquid communication with the fuel reservoir and in vapor communication with the mixing chamber, and (3) a fuel line between the well and the nozzles for supplying fuel to the nozzles in which the amount of fuel supplied to the mixing chamber varies in relation to the difference between the atmospheric pressure and the mixing chamber vacuum pressure as reflected by the difference in fuel levels between the fuel reservoir and the fuel well;
• a throttle valve mounted in the induction duct downstream of the mixing chamber for regulating the flow of said mixture to the engine;
• a pressure sensitive air valve mounted in the induction duct for regulating the amount of air flow into the mixing chamber in relation to the magnitude of vacuum pressure prevailing in the mixing chamber;
• and
• said air valve having an umbrella-shaped valve disc mounted in the induction duct for axial movement in response to the vacuum pressure prevailing in the mixing chamber for regulating the flow into the mixing chamber and for channeling the air entering the mixing chamber into a stream flowing radially outward to the periphery of the disc and along the peripheral wall of the mixing chamber past the ful discharge locations to suspend fuel therein and for creating a pressure depression in the mixing chamber behind the valve disc to cause the stream to flow radially inward from the peripheral wall to form a turbulent eddy in the pressure depression to thoroughly mix the fuel and air.