Kwik Products International

Autoelektronik Ag

Other

Rudolf Diener

Elbert M Hubbard

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. The carburetor is also provided with a capillary action fuel scavenging system which functions to capture fuel centrifugally discharged from the spray ring during rotor spin-down periods to prevent the undesirable delivery of fuel to the engine during such periods. Fuel captured by the scavenging system is returned to the engine fuel supply system.

Rotor-type carburetor with improved fuel scavenging and atomization

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. Additionally, various structural improvements are incorporated into the carburetor. Included in these improvements are a carburetor body construction in which three generally annular sections are telescopingly interengaged to form the outer body of the carburetor, and the provision of improved sealing structures to better inhibit fuel leakage from the turbine rotor assembly.

Rotor-type carburetor apparatus and associated methods

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. The fuel-air ratio correction apparatus includes a regulated injection pump (20) with an injection nozzle (39a) directed at the internal wall (13) of the atomization ring (11) with approximately 50 mm.sup.3 of additional fuel delivered per stroke, and a regulating device (50) with a pulse generator (40) for driving injection pump (20) with pulses of regulated frequency. The regulation of repetition frequency is controlled by control signal generators in dependence on operating parameters of the engine such as opening of the throttle valve (18) for acceleration correction, coolant temperature for the cold start correction, etc. In other embodiments, the air volume is reduced to enrich the mixture, and in another, the air velocity is increased to enrich the mixture.

Fuel-air ratio (lambda) correcting apparatus for a rotor-type carburetor

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.

Turbine rotor assembly for a rotor-type carburetor

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 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. A ventilating passage (42) connects the stowage compartment (40) with the annulus (33) which conducts the fuel discharged from the fuel outlet opening (16) to the spray ring (35) below the blades (38). This ventilation ensures an undisturbed fuel delivery into the annulus (33). This injection device produces an air-fuel mixture in which the toxic constituents in the exhaust lie uniformly below the limit values and there are no high peak values for the toxic constituents.

Central injection device for internal combustion engines

This rotor-carburetor arrangement with idling mixture formation has a traditional throttle flap (2), a rotor-carburetor (3) and at least one idling duct (20). The rotor-carburetor (3) contains an impeller (9) which drives a rotor (8). The rotor (8) has a fuel outlet bore (17). This nozzle bore (17) in the case of a rotating impeller (9) delivers a fuel quantity which stands in a linear relationship to the impeller rpm. The load-fuel air mixture is so lean that a portion of harmful substances in the exhaust gases is minimum and the CO portion is less than about 0.3%. The idling duct (20) has a pipeshaped inlet (23) which is directed toward the impeller (9) and an inlet opening (24) which lies in the marginal area of the intake duct (1) and close below the impeller. In the case of a closed throttle flap (2), the aspirated air flows through the idling duct (20) and this calls for a higher impeller rpm for the idling air throughput. Because of the higher impeller rpm, an idling mixture enriched with fuel will be obtained. The idling mixture in the exhaust gases may be adjusted with the setscrew (25) to 0.5-0.8% CO, which results in a satisfactory idling.

Rotor-carburetor having an idling mixture arrangement for internal

A carburetor for an internal combustion engine comprising a fuel chamber arranged in the mixing compartment of a suction tube and rotatable about the lower end of a fuel-infeed conduit secured in the mixing compartment by means of an impeller wheel rotatable in the sucked-up air current. The fuel chamber possesses at least one lateral nozzle for the delivery of fuel into the mixing compartment. A ring-shaped gap is provided in the fuel chamber between its inner wall and the stationary fuel-infeed conduit. By means of this gap a lower fuel compartment, into which opens the fuel-infeed conduit, communicates with an upper fuel compartment. The upper fuel compartment has a ring-shaped air inlet opening which is coaxially arranged with respect to the fuel-infeed conduit.

Carburetor for an internal combustion engine

A carburetor for an Otto cycle engine comprising a mixing compartment through which flows a suction air current regulated by means of a regulating valve. In the mixing compartment there is prepared from the dosed fuel delivered by nozzle means a fuel-air mixture for the Otto cycle engine. Within the mixing compartment there is arranged an impeller driven by the suction air current, this impeller containing a fuel compartment into which opens a fuel delivery channel. The nozzle means embody nozzle channels which lead away from the fuel compartment, these nozzle channels rotating with the impeller and fuel is sprayed from spray nozzles of the nozzle channels during rotation of the impeller owing to an excess pressure brought about by the centrifugal forces, the fuel being sprayed out of the fuel compartment into the mixing compartment.

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Zurich, Switzerland

Rudolf Diener