US3754739A - Carburetor air/fuel distribution control - Google Patents

Carburetor air/fuel distribution control Download PDF

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Publication number
US3754739A
US3754739A US00165423A US3754739DA US3754739A US 3754739 A US3754739 A US 3754739A US 00165423 A US00165423 A US 00165423A US 3754739D A US3754739D A US 3754739DA US 3754739 A US3754739 A US 3754739A
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United States
Prior art keywords
fuel
valve
passage
air
flow
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Expired - Lifetime
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US00165423A
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English (en)
Inventor
G Buike
W Haboush
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Ford Motor Co
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Ford Motor Co
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Publication date
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M7/00—Carburettors with means for influencing, e.g. enriching or keeping constant, fuel/air ratio of charge under varying conditions
    • F02M7/12—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves
    • F02M7/22—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves fuel flow cross-sectional area being controlled dependent on air-throttle-valve position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/02—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling being chokes for enriching fuel-air mixture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M11/00—Multi-stage carburettors, Register-type carburettors, i.e. with slidable or rotatable throttling valves in which a plurality of fuel nozzles, other than only an idling nozzle and a main one, are sequentially exposed to air stream by throttling valve
    • F02M11/02—Multi-stage carburettors, Register-type carburettors, i.e. with slidable or rotatable throttling valves in which a plurality of fuel nozzles, other than only an idling nozzle and a main one, are sequentially exposed to air stream by throttling valve with throttling valve, e.g. of flap or butterfly type, in a later stage opening automatically

Definitions

  • ABSTRACT The air valve of a dual stage carburetor has a tapered fuel metering rod secured to it and movable as a function of air valve movement to increase fuel flow; the fuel inducted passes through a hole in the air valve and splashes against a member that deflects the fuel downwardly to provide good fuel and air distribution on both sides of the valve; the splash member and air valve together act as a venturi at higher engine speed air flows to provide a greater than normal fuel metering signal at the fuel nozzle, thereby providing greater fuel delivery volume at the higher engine speeds.
  • This invention relates, in general, to a multi-barrel, downdraft type carburetor. More particularly, it relates to a carburetor having primary and secondary stages of operation, the secondary stage having a fuel metering system operably connected to an air valve.
  • the invention provides a fuel flow deflection plate to'not only guide the secondary fuel flow into the throttle bore in a manner to provide good distribution to all the engine cylinders, but the deflecting plate also at times acts as a venturi to increase the air flow velocity at higher air flows to allow a greater than conventional fuel delivery at higher engine speeds.
  • the prior art devices that are directed to multi-barrel carburetors having primary and secondary stages and secondary fuel metering systems operable by air valves generally have only fixed attitude fuel jet nozzles so that the fuel is discharged in one direction only, with no increase above the normal increase in fuel flow delivery volume as a function of the increase in air flow.
  • FIG. 1 is a top plan view of a multi-barrel carburetor embodying the invention
  • FIG. 2 is a cross-sectional view of a portion of the air horn section of the carburetor of FIG. 1 taken on a plane indicated by and viewed in the direction of the arrows 2-2 of FIG. 1; and, I
  • FIG. 3 is a perspective side view of the carburetor of FIG. 1, with parts broken away and in section, illustrating the invention in a different operative position than that shown in FIG. 2.
  • FIGS. 1 and 2 show the outline and a portion of the air horn section, respectively, of a conventional, except for the invention, four barrel carburetor of the downdraft type. It contains two primary throttle bores 12 that are closed at times by a conventional choke plate 14. The latter is fixed for rotation with a shaft 16 rotatably mounted in the carburetor body walls. The carburetor also contains a pair of secondary bores 18, flow through both being controlled by an air valve 20. The latter is fixed for rotation with a shaft 22 also rotatably mounted in the walls of the carburetor body. The carburetor body portion 24 dividing the primary and secondary bores is cast at its lower end to provide an angled secondary fuel passage 24 that leads from a conventional fuel bowl, not shown.
  • the air valve 20 in general is of conventional construction. It is a plate fixed to shaft 22 in an unbalanced manner so as to be responsive to the forces of air acting thereon when the throttle valves, not shown, located below in the carburetor, are opened to admit secondary air and fuel into the engine proper.
  • air valve plate 20 The underside of air valve plate 20 is provided with an ear or socket 26 to which is hingedly mounted the end of a tapered fuel metering rod 28.
  • the metering rod in turn slidably projects through the upper opening of the fuel passage 24 so as together with the fuel passage define a fuel jet or nozzle 29 that varies in area as a function of the movement of the air valve.
  • the tapered metering rod 28 will be moved inwardly into the fuel passage 24 to increase the annular area of the fuel jet nozzle between the walls of the rod and passage, thereby permitting an increasingly greater volume of fuel to be inducted into the secondary bores or passages 18 as the air valve opens.
  • the air valve plate 20 is provided with a hole, aperture or opening 30 over each throttle bore aligned essentially with the discharge outletof fuel nozzle 29. Fuel now discharged from the nozzle passes in a fan shape spray through distribution of the fuel flow into the main induction passage 18.
  • an essentially dome or hat-shaped fuel deflecting member 32 is attached to the air valve plate 20 over each of the holes or apertures 30 to deflect the fuel downwardly into the throttle bores in the most advantageous direction providing the best distribution of fuel and air flow into the intake manifold.
  • the deflecting member in this case consists essentially of an inverted open end channel-shaped member.
  • each member 32 also acts as a venturi at higher air flows at higher engine speeds to increase the fuel metering signal acting on the fuel nozzle 29 to thereby increase the fuel delivery volume at this time.
  • FIG. 3 where it can be seen that when air valve plate 20 is rotated nearly to its vertical position indicating essentially wide open throttle operation, the deflector plates are then essentially aligned with the air flow direction so that a maximum venturi effect is accomplished, as indicated by the arrows.
  • the increased air velocity through the venturi creates an even greater depression at the fuel jet nozzle 29 to effect a greater than normal delivery of fuel at this time.
  • the invention improves the fuel and air distribution through the secondary bores of a multi-barrel air valve type carburetor by guiding the fuel in an efficient manner, and increasing fuel delivery volume at high engine speeds.
  • a carburetor air/fuel mixture flow control device for use in a carburetor having an air/fuel induction passage, with an air inlet at one end and connected to an engine intake manifold at the other end, the passage having a valve rotatably mounted thereacross for movement between positions opening and closing the passage, a fuel passage outlet opening into the passage adjacent and below the valve, fuel metering means secured to the valve and projecting into the fuel outlet in a manner to vary the quantity of fuel flow inducted into the passage as a function of the rotative position of the valve, and fuel and air flow directing means secured to the valve for rotative movement with it for directing the flow of fuel and air into the passage in a manner to maximize air/fuel mixture distribution through the passage, the valve having an aperture therein for passage therethrough of fuel inducted into the passage, the directing means comprising deflecting means in the path of the fuel inducted to be engaged by the fuel and deflect the fuel downwardly into the passage.
  • the deflecting means comprising an open end dome shaped hollow channel-like member overlying the aperture in the valve, the deflecting means also constituting a venturi at higher air flows when the valve is rotated towards an open position for increasing the flow velocity of the air therethrough to thereby induct a greater fuel flow at higher air flows at higher engine speeds.
  • a carburetor air/fuel mixture flow control device for use in a carburetor having an air/fuel induction passage, with an air inlet at one end and connected to an engine intake manifold at the other end, the passage having a valve rotatably mounted thereacross for movement between positions opening and closing the passage, a fuel passage outlet opening into the passage adjacent and below the valve, fuel metering means secured to the valve and projecting into the fuel outlet in amanner to vary the quantity of fuel flow inducted into the passage as a function of the rotative position of the valve, and fuel delivery volume increasing means mounted on the valve for movement therewith for increasing fuel flow at higher air flows upon rotation of the valve to an increased air flow position, said fuel delivery volume increasing means including a hole in the valve aligned with the fuel outlet for induction of fuel through the hole into the passage, and venturi means secured to the valve over the hole whereby air passing through the venturi at increased air flows upon opening rotative movement of the valve increases the fuel delivery volume.
  • venturi being defined by an open end inverted channel shaped member overlying the hole and directing fuel splashed thereagainst downwardly towards the center of the passage.
  • a carburetor fuel and air flow control member comprising, an air valve rotatable mounted across a carburetor induction passage, the latter having a fuel outlet port downstream of the valve, the valve having a tapered fuel metering rod movable with the valve variably in'to'the fuel outlet to constitute a variable area fuel jet, the valve having an opening aligned with the flow of fuel from the jet into the passage so as to permit the passage of the fuel therethrough, and a fuel flow directing means and fuel volume control member secured to the valve on the upstream side of the valve over the opening for deflecting the fuel flow downstream towards the center of the induction passage to minimize fuel fogging while providing good distribution of fuel and air throughout the passage.
  • control member as in claim 8, the control member consisting of an inverted channel shaped member covering the opening and constituting a splash surface for the fuel.
  • control member as in claim 8, the control member consisting of a dome like member open at its ends and covering the opening to define a venturi operable at higher air flows to increase the velocity of air passing through the venturi to increase the fuel metering induction signal on the fuel jet to increase fuel flow at this time.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
  • Means For Warming Up And Starting Carburetors (AREA)
US00165423A 1971-07-21 1971-07-21 Carburetor air/fuel distribution control Expired - Lifetime US3754739A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US16542371A 1971-07-21 1971-07-21

Publications (1)

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US3754739A true US3754739A (en) 1973-08-28

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US00165423A Expired - Lifetime US3754739A (en) 1971-07-21 1971-07-21 Carburetor air/fuel distribution control

Country Status (6)

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US (1) US3754739A (de)
JP (1) JPS5025976B1 (de)
AU (1) AU459913B2 (de)
CA (1) CA982433A (de)
DE (1) DE2228167C3 (de)
GB (1) GB1387295A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4276239A (en) * 1978-10-19 1981-06-30 Nissan Motor Company, Limited Variable air valve carburetor
US5176855A (en) * 1990-02-02 1993-01-05 David P. Ward Liquid fuel system with tilt valve

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1900191A (en) * 1930-07-28 1933-03-07 Bendix Aviat Corp Charge forming device
US3322408A (en) * 1965-09-01 1967-05-30 Gen Motors Corp Carburetor
US3392965A (en) * 1967-02-13 1968-07-16 Ford Motor Co Fuel metering system for an air valve carburetor
US3432152A (en) * 1966-03-25 1969-03-11 Frank B Sweeney Fuel injection system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1900191A (en) * 1930-07-28 1933-03-07 Bendix Aviat Corp Charge forming device
US3322408A (en) * 1965-09-01 1967-05-30 Gen Motors Corp Carburetor
US3432152A (en) * 1966-03-25 1969-03-11 Frank B Sweeney Fuel injection system
US3392965A (en) * 1967-02-13 1968-07-16 Ford Motor Co Fuel metering system for an air valve carburetor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4276239A (en) * 1978-10-19 1981-06-30 Nissan Motor Company, Limited Variable air valve carburetor
US5176855A (en) * 1990-02-02 1993-01-05 David P. Ward Liquid fuel system with tilt valve

Also Published As

Publication number Publication date
AU4415172A (en) 1974-01-10
DE2228167C3 (de) 1981-05-27
CA982433A (en) 1976-01-27
AU459913B2 (en) 1975-04-10
DE2228167B2 (de) 1980-10-02
JPS5025976B1 (de) 1975-08-28
DE2228167A1 (de) 1973-02-15
GB1387295A (en) 1975-03-12

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