Abstract: A rotor-type carburetor is provided with a specially designed spray ring which centrifugally discharges atomized fuel droplets in two different sizes for mixture with engine-ingested air traversing the interior of the carburetor and driving its rotor section. Larger droplets are forced outwardly through an annular series of discharge openings formed in the ring, while smaller droplets are formed by the passage of fuel over an annular spray edge extending around the bottom of a radially inwardly bent lower end portion of the ring. This simultaneous formation and discharge of two series of differently sized atomized fuel droplets improves the overall performance of the engine and reduces the level of its emission pollutants. The spray ring also functions to automatically vary, in a predetermined manner, the flow rate relationship between the differently sized fuel droplets as a function of engine speed to further enhance engine performance.

Abstract: An improved rotor-type carburetor for use with an internal combustion engine is provided which, in one embodiment, is adjustable to selectively vary its constant fuel-air ratio by axially moving an internal body portion thereof relative to the turbine rotor assembly of the carburetor. Alternatively, the constant fuel-air ratio of the carburetor may be altered simply by replacing such internal body portion with a differently configured one. Undesirable fuel delivery from the turbine rotor to the engine during turbine spin-down is significantly diminished through the use of an internal fuel reservoir structure, formed within the carburetor body, which functions to capture and retain unneeded fuel discharged from the rotor during turbine spin-down periods. During turbine spin-up periods (e.g., when the engine is being started) the reservoir-retained fuel is released into the engine's incoming air stream to hasten fuel delivery to the engiune during initial portions of turbine spin-up periods.

Abstract: An airstream driven rotor assembly with a centrifugal pump forcing a measured fuel quantity through a fixed orifice in direct substantially linear proportion to rotor speed and thus to airstream volume. The ultimate fuel-air ratio is corrected for optimum operation by slightly changing, in response to measured parameters, one of the mixture constituents. In one embodiment, the fuel discharge bore (9) of a rotor (7) is dimensioned that the rotor carburetor (2) produces a lean mixture with a .lambda.-value which is constant for all operating points approximately 1.25. For fuel-air ratio correction additional fuel is brought into atomization ring (11) of rotor (7), by which the fuel-air ratio in the lean mixture is changed and at the engine operating points the .lambda.-values are adjusted to give most favorable fuel consumption, output and pollution.

Abstract: An injection molded plastic turbine rotor for a rotor-type carburetor is assembled by simply pressing together upper and lower generally cylindrical sections. When joined in this manner the two sections form in the assembled rotor an internal circumferential seal between the two sections, and an internal passageway system which defines a centrifugal pump mechanism within the turbine rotor. In an alternate embodiment, the rotor includes a third plastic section which is captively retained within the rotor, between the upper and lower sections thereof, and is adapted to lockingly receive an end portion of a fuel supply tube inserted downwardly through a central opening formed through the upper section.

Abstract: The annulus (20) around the fuel feed stud (8) which seals the rotor (14) of this central injection device is connected to a stowage compartment (40) for intake air by way of a ball bearing (7). In the case of the impeller (31, 35) driven rotor (14), the stowage air pressure counteracts the leakage fuel pressure in the annulus (20). By .[.adapting.]. .Iadd.adopting .Iaddend.the width of the opening of the stowage compartment (40), the stowage air pressure is adjusted to be equal to or slightly higher than the leakage fuel pressure, so that no fuel can flow out of the annulus (20). .[.To enrich the fuel of the air-fuel mixture in the higher load range, a width of opening of the stowage compartment (40) is provided where the stowage air pressure at the corresponding RPM's becomes smaller than the leakage fuel pressure and the rotor (14) delivers additional fuel. .].