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 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.

Abstract: 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.

Abstract: 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.