Carburetor for an internal combustion engine

In a carburetor of the injection type for an internal combustion engine having a fuel supply and a mixing chamber, the combination comprising

• a fuel-infeed conduit adapted to be fixedly disposed coaxially within the mixing chamber, said conduit having a lower end with a fuel outlet opening,
• a fuel chamber cooperating with said conduit,
• an impeller for rotating the fuel chamber about the lower end of said conduit and about an axis defined by said conduit,
• said fuel chamber including a bottom disposed under the fuel outlet opening of said conduit and at least one fuel ejection opening being disposed above the fuel outlet opening of said conduit by a distance greater than an outer diameter of said conduit,
• said fuel chamber and the lower end of said conduit cooperating to define a lower fuel compartment,
• said lower fuel compartment extending between the fuel chamber bottom and the fuel outlet opening of said conduit,
• fuel flow channel means extending parallel to the axis of rotation of said fuel chamber from said lower fuel compartment to said fuel ejection opening,
• said channel means having a lower end communicating with said lower fuel compartment and an upper end transverse to the axis of rotation of said fuel chamber and communicating with said fuel ejection means, and
• an annular gap between said conduit and an inner surface of said fuel chamber.

A carburetor for an internal combustion engine, comprising means defining a fuel chamber, a fuel-infeed conduit cooperating with the fuel chamber, an impeller wheel for rotating the fuel chamber about a lower end of the fuel-infeed conduit, the fuel chamber possessing at least one lateral nozzle for the delivery of fuel into a mixing compartment, a substantially ring-shaped gap provided in the fuel chamber between its inner wall and the fuel-infeed conduit, the fuel chamber including a lower fuel compartment and an upper fuel compartment, the fuel-infeed conduit opening into the lower fuel compartment, the ring-shaped gap flow communicating the lower fuel compartment with the upper fuel compartment, the upper fuel compartment having a ring-shaped air inlet opening which is substantially coaxially arranged with respect to the fuel-infeed conduit, wherein the means defining said fuel chamber incorporates a housing having a housing wall, and within the fuel chamber-housing there is provided between the housing wall and the fuel-infeed conduit a substantially ring-shaped compartment forming the ring-shaped gap and the upper fuel compartment, the length of the ring-shaped compartment being greater than the outer diameter of the fuel-infeed conduit, and the diameter of the lower fuel compartment which is coaxial with the fuel-infeed conduit is smaller than the external diameter of the fuel-infeed conduit, and at least one fuel channel provided at its upper end with said nozzle, said channel leading laterally upwardly away from the lower fuel compartment, the nozzle comprising a dosing nozzle delivering a quantity of fuel which is at least approximately proportional to the square root of the fuel excess pressure prevailing in the fuel channel.