US3317196A - Carburetor - Google Patents

Carburetor Download PDF

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Publication number
US3317196A
US3317196A US439200A US43920065A US3317196A US 3317196 A US3317196 A US 3317196A US 439200 A US439200 A US 439200A US 43920065 A US43920065 A US 43920065A US 3317196 A US3317196 A US 3317196A
Authority
US
United States
Prior art keywords
fuel
carburetor
nozzle
air
barrels
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US439200A
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English (en)
Inventor
Robert J Smith
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ACF Industries Inc
Original Assignee
ACF Industries Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ACF Industries Inc filed Critical ACF Industries Inc
Priority to US439200A priority Critical patent/US3317196A/en
Priority to GB4359/66A priority patent/GB1121571A/en
Priority to DE1526651A priority patent/DE1526651C3/de
Application granted granted Critical
Publication of US3317196A publication Critical patent/US3317196A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • F02M5/00—Float-controlled apparatus for maintaining a constant fuel level
    • 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
    • F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
    • F02M2700/43—Arrangements for supplying air, fuel or auxiliary fluids to a combustion space of mixture compressing engines working with liquid fuel
    • F02M2700/4302—Arrangements for supplying air, fuel or auxiliary fluids to a combustion space of mixture compressing engines working with liquid fuel whereby air and fuel are sucked into the mixture conduit
    • F02M2700/4304—Arrangements for supplying air, fuel or auxiliary fluids to a combustion space of mixture compressing engines working with liquid fuel whereby air and fuel are sucked into the mixture conduit working only with one fuel
    • F02M2700/4311—Arrangements for supplying air, fuel or auxiliary fluids to a combustion space of mixture compressing engines working with liquid fuel whereby air and fuel are sucked into the mixture conduit working only with one fuel with mixing chambers disposed in parallel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/50—Surge prevention in carburetors

Definitions

  • R. J. SMITH may 2, 1957 CARBURETOR 2 Sheets-Sheet 1 Filed March 12, 1965 INVENTOR.
  • This invention relates to carburetors and in particular to low-profile multi-stage carburetors having both primary and secondary conduits and to a novel nozzle construction particularly adapted for use in the secondary conduit.
  • the automatic transmission was set to downshift if the throttle was opened far enough to open the secondaries.
  • the increase in engine speed after the-downshift so .increased .the air flow velocity in the secondaries that satisfactory operation of the carburetor was obtained.
  • the downshift of course, increased the torque transmitted from the automatic transmission and this was accomplished by the natural increase in torque from the engine which jumped to higher speeds.
  • a multi-stage, multi-barrel carburetor is constructed with primaries which are relatively much smaller than the secondaries.
  • the small primaries will provide a soft smooth engine response in the low-speed low-power range of the engine, while the much larger secondaries will supply the capacity for fuel engine power throughout a substantial range of engine operation.
  • the large secondary barrels or mixture conduits are provided with downwardly inclined main fuel nozzles, which nozzles are so constructed as to permit high tilt angles.
  • the nozzles are so installed as to aid or facilitate the separation of vaporous fuel from liquid fuel thus providing percolation-resistant characteristics.
  • FIGURE 1 is a top-plan View of a four-barrel carburetor incorporating the invention.
  • FIGURE 2 is a side sectional view of the carburetor of FIGURE 1.
  • FIGURE 3 is a sectional view of a portion of a carburetor showing the float chamber and nozzle construction of a prior-art device.
  • a carburetor having primary barrels 12 and 14 and secondary barrels 16 and 18. Each of the primary barrels is provided with a venturi cluster 21 and a main fuel nozzle 22.
  • the primary barrels of the carburetor are provided with a common choke valve 24 attached to a shaft 26 which is freely journaled at its ends to a portion of the carburetor air horn. Attached to shaft 26 is a lever arm 28 coupled by a link 30 to another lever arm 32 which in turn is coupled to a shaft 34.
  • the shaft 34 is a counter-shaft for actuating the choke valve and shaft 34 may be provided at itsends with any conventional choking mechanism such as a manual choke or an automatic choke. Also counter-shaft 34 may be provided with a vacuum choke break unit 36'if desired.
  • Primary bores 12 and 14 are also provided with throttle valves indicated at 37 which valves are mounted on a throttle shaft 38 journaled
  • the secondary side of the carburetor is provided with an air valve 54 as shown in the open position. Air valve 54 is mounted on a shaft 56 journaled into the air horn of the carburetor.
  • Shaft 56 is also provided with a biasing spring 58 for urging the air valve to a normally closed position. The air valve is opened by pressure of air against it whenever the secondary throttles are open and the engine demands additional air and fuel.
  • FIGURE 2 where the secondary portion of the carburetor is shown in section, it is seen that there are provided a pair of float chambers 60 which contain floats 62 for regulating the quantity of fuel in the float chamber.
  • the floats 62 are provided with actuating means for operating a needle valve to adrnit fuel as required.
  • Bleeder tube 68 is provided with a plurality of air bleed holes 69 which are supplied with air through a drilled passage 70. Air entering the fuel through holes 69 aerates and partially emulsifies the fuel as it rises in the passageway 66.
  • a hollow tube or fuel nozzle 72 is installed, as by a press fit, in suitable holes in the body of the carburetor so as to intersect fuel well 66 and project outwardly and downwardly into each of secondary barrels 18.
  • the downward inclination of the tube 72 provides clearance for the air valve plate 54.
  • Each nozzle tube 72 is provided with a plug 74 to close the end thereof as shown.
  • Each nozzle is further provided with an aperture or notch 76 which as shown is in an upper portion of the tube. It is to be understood, however, that the notch 76 could be placed elsewhere as to one side or the other or even at the bottom of tube 72 if desired. The location of notch 76 will have an effect on the tilt angle required for fuel will spill over of its own accord through the nozzle, as will be herein after explained.
  • Each fuel well 66 is also provided with a closure plug 77 at the top thereof and each plug is provided with a vent hole '78.
  • Vent holes 78 serve a two-fold function. One of these functions is to serve as a siphon break to prevent fuel from siphoning over through the nozzle from the fuel well 66. Another function is to release vapors that may build up in the system. A buildup of vapors can occur when the automobile engine is hot and no fuel is being drawn through the main nozzle 72. Under these conditions fuel vaporizing in well 66 will cause percolation of the liquid portion of the fuel and under some circumstances this may cause fuel to flow through the nozzle even though there is no requirement for the same. Vent hole 78 therefore permits release of these vapors and serves as an anti-percolation device.
  • FIGURE 3 In the fragmentary section of FIGURE 3 there is shown in nozzle 72A of the type that has been used in some prior art carburetors.
  • the fuel bowl is shown at an angle as would be the case if a car were parked on a hillside or similar location. In this tilted attitude, the fuel rises in the fuel well 66 to such an extent that as shown in FIGURE 3 it is beginning to spill over into nozzle 72A.
  • the angle indicated at X is the tilt angle permissible before fuel begins to spill over. In this instance, it is approximately 11 degrees although other angles of greater or lesser amounts may occur with slight changes in spacing or geometry of the carburetor.
  • a carburetor for an internal combustion engine comprising:
  • an air valve in said secondary conduit anterior to said point of entry of main fuel said air valve being adapted to substantially close off said secondary conduit and thereby prevent entry of air into said secondary conduit when said air valve is closed, said air valve being provided with biasing means urging said air valve to closed position, said biasing means being responsive to air flow through said secondary conduit to open an amount proportional to the flow of air,
  • a fuel bowl connected to a source of fuel and having valve means for regulating admission of fuel to said bowl,
  • a downwardly inclined fuel nozzle intersecting said passage and extending into said secdary conduit, said nozzle being closed at the end extending into said passage and being provided with an aperturee in the upper portion only of said nozzle extending into said passage, said aperture being located so as to permit tilt angles of about 22 degrees, the portion of said nozzle under said aperture and in said passage serving to function as a vapor separator, and an anti-percolation vent at the top of said passage for venting vapors from said passage.

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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)
  • Automatic Cycles, And Cycles In General (AREA)
US439200A 1965-03-12 1965-03-12 Carburetor Expired - Lifetime US3317196A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US439200A US3317196A (en) 1965-03-12 1965-03-12 Carburetor
GB4359/66A GB1121571A (en) 1965-03-12 1966-02-01 Carburettors
DE1526651A DE1526651C3 (de) 1965-03-12 1966-03-04 Vergaser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US439200A US3317196A (en) 1965-03-12 1965-03-12 Carburetor

Publications (1)

Publication Number Publication Date
US3317196A true US3317196A (en) 1967-05-02

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ID=23743715

Family Applications (1)

Application Number Title Priority Date Filing Date
US439200A Expired - Lifetime US3317196A (en) 1965-03-12 1965-03-12 Carburetor

Country Status (3)

Country Link
US (1) US3317196A (de)
DE (1) DE1526651C3 (de)
GB (1) GB1121571A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3628773A (en) * 1968-10-03 1971-12-21 Gen Motors Corp Carburetor
US4060573A (en) * 1974-03-29 1977-11-29 Hitachi, Ltd. Carburetor assembly
US6003844A (en) * 1996-12-20 1999-12-21 Nippon Carburetor Co., Ltd Dual carburetor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2832576A (en) * 1955-08-01 1958-04-29 Acf Ind Inc Two-stage carburetor
US3053240A (en) * 1960-10-27 1962-09-11 Gen Motors Corp Carburetor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2832576A (en) * 1955-08-01 1958-04-29 Acf Ind Inc Two-stage carburetor
US3053240A (en) * 1960-10-27 1962-09-11 Gen Motors Corp Carburetor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3628773A (en) * 1968-10-03 1971-12-21 Gen Motors Corp Carburetor
US4060573A (en) * 1974-03-29 1977-11-29 Hitachi, Ltd. Carburetor assembly
US6003844A (en) * 1996-12-20 1999-12-21 Nippon Carburetor Co., Ltd Dual carburetor

Also Published As

Publication number Publication date
DE1526651C3 (de) 1974-05-09
GB1121571A (en) 1968-07-31
DE1526651A1 (de) 1970-01-22
DE1526651B2 (de) 1973-10-11

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