Carburetor

Claim 1

A carburetor for an internal combustion engine which includes a duct connectable to a combustible charge inlet of the engine; a vane mounted to be displaceable by airflow through the duct; a butterfly valve within the duct and connectable to a throttle linkage of the engine; a regulating valve extending transversely into the duct and having an outlet directly into the duct, the regulating valve including a first regulating member having a helical groove rotatably displaceable into and out of progressive alignment with the outlet; and at least one control valve, the control valve and the regulating valve being connected in series for controlling and regulating fuel flow from a fuel source and into the duct via the outlet, the regulating valve being controllably operable by the vane dependent on the rate of airflow through the duct and the control valve being linked to the butterfly valve to operate in conjunction with the degree of opening of the butterfly valve, and in which the control valve is in the form of a housing having an inlet connected to the fuel source with a second regulating member in sealing engagement with the inner walls of the housing, the second regulating member having a groove formed in its periphery to form a restricted passage between the housing inlet and the outlet, and the second regulating member being controllably displaceable to vary the supply of fuel from the housing inlet through the restricted passage to the outlet.