US3168599A - Carburetor main fuel nozzle - Google Patents

Description

Feb. 2, 1965 F. J. MARSEE ETAL CARBURETOR MAIN FUEL NOZZLE Filed July 16, 1962 Q JM an ATTO/P/VEY United States Patent Oil" 3,168,599 CARZBURETGR MAIN FUEL NOZZLE Frederick J. Marsee, Hazel Park, Neil M. Romeo, St.

Clair Shores, and John Dirda, Detroit, Mich., assignors to Holley Carburetor Company, Warren, Mich., a corporation of Michigan Filed July 16, 1962, Ser. No. 209,823 3 Claims. (Cl. 261-65) This invention relates generally to carburetors for internal combustion engines, and more specifically to a novel carburetor and main nozzle construction.

Each carburetor design and application presents its own peculiar problems of proper distribution of fuel and air mixture to the engine, and it has been found that variations in main nozzle design may substantially effect distribution. Also, each carburetor design presents peculiar problems in the manner in which the main nozzle must be formed or assembled in the carburetor.

A main object of this invention is to provide a nozzle design which is capable of thoroughly mixing and dispersing the fuel and air mixture, in order that proper distribution to the engine will be attained.

A specific object of the invention is to provide a novel nozzle and carburetor structure in which the nozzle is easily manufactured and adaptable to be inserted into the main Well chamber of the carburetor.

Other objects and advantages of the invention will become apparent when reference is made to the accompanying illustrations wherein:

FIGURE 1 is an elevational view, with portions thereof broken away and in cross section, illustrating a carburetor embodying the invention and mounted on an intake manifold.

FIGURE 2 is an enlarged perspective view of a nozzle embodying the invention.

Referring to the drawings in greater detail, FIGURE 1 illustrates generally a carburetor 16, which may comprise upper and lower portions 12 and 14, mounted on m engine intake manifold 16. The carburetor comprises an induction passage 18 having the usual choke plate 20', venturi 22 and throttle plate 24 therein, as well as the novel main fuel nozzle 26. The fuel reservoir 28 is generally formed as an integral part of the carburetor 10', and it has associated therewith a main metering system 30. A conduit 32 containing a main metering jet 34 communieates between the fuel reservoir 28 and the main well 36 of the main fuel metering system 30.

A main well tube 38 is pressed into the upper body 12 of the carburetor 10, as at 40, so as to be suspended in the main well 36 When the portions 12 and 14 are assembled. The main well tube 38 contains a plurality of bleed passages 42 so as to communicate the inside of the tube with the main well chamber 36. A conduit 44 and a restriction 46 communicate between the open top 48 of the main well tube 38 and the induction passage 18.

The novel main fuel nozzle 26 is associated and cooperates with the carburetor main metering system 30 by virtue of having its tubular inlet end 50 press fitted into a bore 52 in the lower body 14 of the carburetor 10, so as to surround the main well tube 38. That is, the tubular end 50 forms a portion of the main well 36. A discharge passage 54 through the stem 56 of the main nozzle 26 communicates between the main well 36 and the induction passage 18. An anti-siphon air bleed 58 communicates between the inlet end 60' of the discharge passage 54 and the conduit 44 leading to the induction passage 18.

As is better illustrated in FIGURE 2, the novel main nozzle 26, which may comprise a one piece casting, is formed so as to include a cylindrical end 58 adapted to be press fitted into a counter-bored upper end 52 of the main fuel well 36 so as to form, with its inside wall 62 a continuation of the main well chamber 36. The upper portion of the cylindrical end 50 is extended tangentially from two sides 64 and 66 thereof, so as to enable formation of a point of intersection 68 between the uppermost end of the main well chamber 36 and the passage 54 extending axially through the downwardly sloping stem 56, the latter entering the induction passage 18 in the vicinity of the venturi 22. The surface 70 at the inlet end 60 is perpendicular to the axis of the stem 56.. At the discharge end 72 of the stem 56 there is formed a pair of diverging prongs 74 and 76 having a separating fillet therebetween substantially equal to the diameter of the passage 54. A vertical passage 78 is formed through the center of a rounded protuberance 80 which connects the discharge end 72 of the stem 56 to the separated prongs 74 and 76.

Operation When the engine is operating, fuel already partially mixed with air is drawn in the well known manner into the main well 36, into the clearance 82 between the cylindrical end 50 of the nozzle 26 and the main well tube 38 and thence through the passage 54 and outlet 84 into the induction passage 18. As the fuel is discharged through the outlet 84, it is intercepted by a downward flow of air through the centrally located passage 78. A portion of the resulting fuel-air mixture is then deflected upon impact with the two prongs 74 and 76, while another portion of the mixture passes between the prongs. The various portions of the fuel-air mixture are thus distributed in a controlled manner by and through the prongs 74 and 76, depending upon the preselected attitude and shape of the prongs.

Actual tests have proven that a fuel-air mixture dispersed in this manner upon being discharged into the air stream through the induction passage 18 has resulted in an ideal distribution to the cylinders of the engine.

It is also apparent that this nozzle construction, in addition to providing ideal distribution of fuel, provides a Very convenient method of assembling a separately formed nozzle into the carburetor. The tubular end 50 of the nozzle is merely inserted into the bore 52 in the lower portion 14 of the carburetor, and the gasket 85 and upper portion 12 of the carburetor are then assembled on the lower portion 14 so as to retain the nozzle 26.

Although but one embodiment of the invention has been shown and described, it is apparent that other .modifications thereof may be made without exceeding the scope of the appended claims.

What we claim as our invention is:

1. Carburetor, comprising assembled upper and lower body portions; a main fuel metering system including a main well chamber and a main well tube, an induction passage having a venturi and throttle plate therein, and a main fuel nozzle having a hollow mounting portion inserted in and forming a part of said main well chamber, a stem extending from a point adjacent the top of said main well chamber to substantially the center of said venturi, a plurality of downwardly extending protrusions, a bridge-like portion formed between the tops of said protrusions and the end of said stem positioned in said induction passage, and a vertical passage formed through said bridge-like portion.

2. In a carburetor having upper and lower body portions, a main fuel metering system including a main well chamber and a main well tube, and an induction passage having a venturi and throttle plate the-rein, a main fuel nozzle, said nozzle comprising a cylindrical portion for insertion in said main well as a part of the wall of said main Well, a downwardly sloping stem extending from said cylindrical portion and into said induction passage, an

Patented Feb. 2, 1965 1 axial passageway through said stem, a pair of legs opposite the outlet end of said stem and connected to the top of said outlet end by a bridge-like portion, and a passage through said bridge-like portion.

3. In a carburetor having assembled upper and lower body portions, a main fuel metering system including a main well chamber and a main well tube, and an induction passage having a venturi and throttle plate therein, a main fuel nozzle, said nozzle comprising a tubular portion inserted into said main well with the top surface thereof level with the top surface of said lower body and the inside surface thereof forming a vertical extension of said main well chamber, an integral portion extending from substantially the upper half of said tubular portion and toward said induction passage, a stem extending from said integral portion in a downwardly sloping attitude into said induction passage and terminating at a point substantially at the center of said venturi, a passageway extending radially through the length of said stem, a protuberance extending from the end of said stem and having a pair of vertical legs extending downwardly therefrom toward said throttle plate with the top of the opening be tween said pair of vertical legs being substantially level with the axis of said passageway, and a vertical opening formed through said protuberance.

References Cited in the file of this patent UNITED STATES PATENTS 2,615,695 Winkler Oct. 28, 1952 2,986,378 Moseley May 30, 1961 3,076,639 Szwargulski et a1 Feb. 5, 1963 3,081,986 Egerer Mar. 19, 1963 3,089,634 Smith May 14, 1963 FOREIGN PATENTS 602,404 France Dec. 23, 1925 881,461 Great Britain Nov. 1, 1961

Claims (1)

1. CARBURETOR, COMPRISING ASSEMBLED UPPER AND LOWER BODY PORTIONS; A MAIN FUEL METERING SYSTEM INCLUDING A MAIN WELL CHAMBER AND A MAIN WELL TUBE, AN INDUCTION PASSAGE HAVING A VENTURI AND THROTTLE PLATE THEREIN, AND A MAIN FUEL NOZZLE HAVING A HOLLOW MOUNTING PORTION INSERTED IN AND FORMING A PART OF SAID MAIN WELL CHAMBER, A STEM EXTENDING FROM A POINT ADJACENT THE TOP OF SAID MAIN WELL CHAMBER TO SUBSTANTIALLY THE CENTER OF SAID VENTURI, A PLURALITY OF DOWNWARDLY EXTENDING PROTRUSIONS, A BRIDGE-LIKE PORTION FORMED BETWEEN THE TOPS OF SAID PROTRUSIONS AND THE END OF SAID STEM POSITIONED IN SAID INDUCTION PASSAGE, AND A VERTICAL PASSAGE FORMED THROUGH SAID BRIDGE-LIKE PORTION.

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