Carburetor for an internal combustion engine

Claim 1

A carburetor for an internal combustion engine comprising a lower portion having an opening adapted to be connected to a suction inlet of the engine, a partially closed compartment defining an air passage therethrough extending upwardly from said opening and being provided with a cover, valve means for regulating the air passage through said opening thereby controlling the transmission into said compartment of the reduced pressure produced by the suction effect of the engine, piping means including an arrangement of fuel lines adapted to be connected to a fuel supply and provided with fuel distribution means for providing an air-fuel mixture necessary for each running speed of the engine, said fuel distribution means comprising a system of outlets connected to means for conditioning the fuel flow, said conditioning means including a device sensitive to at least one of the two joint parameters which are the reduced pressure and the kinetic energy of the air current, said sensitive device comprises fuel outflow regulating means which cooperates with an outlet to control the distribution of a fuel flow adapted to each of the running speeds of the engine, said compartment being formed in a tubular body which has the general form of a funnel, said valve means comprising a butterfly-valve being mounted in the tubular part having the smallest transversal dimension of this body and the said compartment being formed in the truncatEd part of the funnel form, the main jet fuel outlet, regulatable and susceptible of being completely closed, comprising calibrated openings provided in the lower part of the wall of a conduit having the form of a tube element secured to said cover at the center of the height of the funnel form, directed towards the bottom coaxially to this form, whereby said tube element forms at least a part of said arrangement of fuel lines and said sensitive device comprising a movable choke plate crossed through at its center by said tube element and displacing itself coaxially to said tube element and to the funnel form to control an air inflow through an opening made in the cover of said compartment, the movement of said choke plate being controlled against the action of elastic retraction means by the suction in the said compartment, said main fuel outlets being controllably opened or closed relative to the amount of said air inflow, said fuel outflow regulating means of said sensitive device being fixedly connected to said movable choke plate by an open cradle means under said choke plate and includes a piston slidingly positioned at the lower end of the fuel outlet conduit for controlling the fuel discharged through said calibrated openings in said fuel conduit, said choke plate being constructed and positioned relative to said main outlets and said fuel outflow regulating means for causing fuel to be ejected directly below said choke plate in the part of said compartment where reduced pressure from the engine is primarily introduced, whereby the fuel impacts the incoming air under optimum conditions for intimate mixing with each other.