US3903214A - Carburetor devices - Google Patents

Carburetor devices Download PDF

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Publication number
US3903214A
US3903214A US351636A US35163673A US3903214A US 3903214 A US3903214 A US 3903214A US 351636 A US351636 A US 351636A US 35163673 A US35163673 A US 35163673A US 3903214 A US3903214 A US 3903214A
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United States
Prior art keywords
well
induction pipe
engine
fuel feed
feed device
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Expired - Lifetime
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US351636A
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English (en)
Inventor
Jacques Sigwald
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Automobiles Peugeot SA
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Automobiles Peugeot SA
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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
    • F02M7/06—Means for enriching charge on sudden air throttle opening, i.e. at acceleration, e.g. storage means in passage way system
    • 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

Definitions

  • a main fuel feed circuit has an outlet opening onto an induction pipe in the vicinity of the throat.
  • a fuel regulating butterfly member is'mounted downstream of the throat and a starting flap is mounted upstream of the throat.
  • An additional fuel feed device has an outlet which opens onto the induction pipe downstream of and in the vicinity of the flap when the flap is substantially in its induction pipe closing position.
  • PATENTEB SEP 2 975 SHEEI30f3 It is current practice to employastarting flapin carburetors intended to sup'ply'ra ⁇ mixture of airand petrol or gasole'ne to internal combustion engines so as to facilitate starting'the en'ginc when the latter is-cold.
  • This flap which may be controlled manually or automatically. is p'lacedin the-induction pipe upstream of the venturi. When thc engine is cold. the flap is in its closing position in which'it allows passage of only a small amount of air.
  • the depression or suction produced in the region of the emulsion'outlet jet located in the vicinity of the throat-thus results in an enrichment of the mixture Whieh'facilitates the starting of the engine.
  • the starting flap As soon as the engine is'sufficiently warm. the starting flap is brought to-its position of maximum opening where it no longer performs its function.
  • An object of the invention is to overcome the aforementioned drawback.
  • the additional feed device may comprise a well which is connected to prevailing in theinductionpipedownstream of the butterfly member andlor'in accordance with the temperatureof the cnginccoolihg fluid.
  • FIG. l is a'vi ew in partial cross-section of a-carburetor device constructed in accordance with the present invention.
  • H6. 2 is avicw in partial cross-section ofa second cmbodiment'of the inventior'rwhich provides fuel enrichmcntduringacceleration?
  • w 1 FIG. 3 isa vie'vi' lll partial cross-section illustrating a third embodiment c'iftlfe'in'vention which limits fuelcn: richment during idling or lowload.”
  • FIG. 4 is a view in partial cross-section illustrating a fourth embodiment 'of the inicntion which limitsfucl enrichment during idlingorlow load.
  • FIG. 5 is a viewin partial cross-section illustrating a fifth embodiment of the invention having a thermostatic device to preclude fuel enrichment in a warm en-
  • FIG. 6 is a view in. partial cross-section illustrating a sixth embodiment of the invention having a thermostatic device to preclude fuel enrichment in a warm engine.
  • a constant-level float chamber 1 1.
  • a casing 2 provided with a venturi 3 defining a throat.
  • a main fuel feed circuit 8 comprising a well 9 connected to the float chamber 1 through a calibrated jet 10, an airjet 11 extended by a spray jet 12 and an emulsion outlet nozzle 13 opening into the casing 2.
  • an additional feed device or complementary feed circuit comprising a well 14 which communicates in its lower part with the chamber 1 through a calibrated jet 15 is provided in its upper part with ajet 16 for the entry of air and is connccted through a passageway 17 to an orifice 18 disposed downstream of the flap 7 when the latter occupies a position in the vicinity of the closing position.
  • FIG. 2 which is slightly more perfected.
  • the elements already shown in FIG. I carry the same reference characters.
  • the improvement resides in the provision of a tube 19 which extends the jet l6 downwardly into the fuel.
  • This tube I9 is provided with a calibrated orifice 20 in its upper part.
  • This embodiment operates in the following manner: when the flap 7 occupies its closing position and the butterfly member 5 is in its idling speed position. there is created between these two elements a depression which. as in the first embodiment. enrichens the mixture supplied and acts on the upper part of the well H where it is attenuated owing to the entry of air by way of the jet l6 and the orifice 20. The fuel therefore rises in the well to a level slightly below the passageway 17 as shown in FIG. 2.
  • FlGS. 3-6 illustrate additional arrangements for preventing in a certain manner the additional fuel feed when the latter is undesirable.
  • FIGS. 3 and 4 illustrate two devices which overcome this drawback and prevent operation of the additional fuel feed device when the engine is employed at idling speed or at low load.
  • a capsule 21 mounted in the upper part of the well 14 comprises an elastic diaphragm 22 which divides it into two chambers 21a. 21b.
  • the chamber 21a is connected to the induction pipe. downstream of the butterfly member 5. and receives a spring 23 which biases the diaphragm 22.
  • the chamber 21/) is connected to the atmosphere and communicates by way of an orifice 24 with the upper part of the well 14.
  • the diaphragm 22 carries a closure member 2211 which controls the opening or closing of the orifice 24.
  • the butterfly member 5 occupies a position in the neighbourhood of closing position. for example the position corresponding to idling speed or low load.
  • the depression acting on the diaphragm 22 maintains it remote from the orifice 24.
  • the depression then prc- ⁇ ailing in the upper part of the well 14 is low and the fuel cannot reach the level of the conduit or passage way 17. ll the butterfly member 5 is sufficicntly open.
  • a capsule 25 comprises an elastic diaphragm 26 subjected to the action of a spring 27 and to the depression prevailing in the induction pipe downstream of the butterfly member 5.
  • This diaphragm actuates a slide 28 placed across the passageway 17. So'long as the butterfly member 5 occupies a position in the neighbourhood of the closing position. the depression acting on the diaphragm 26 is such that the slide 28 closes the passageway 17.
  • thebutterfly member 5 is sufficiently open. there is a drop in the depression and the spring 27 shifts the diaphragm 26 and slide 28 which opens the passageway 17 as shown in the drawing.
  • the additional fuel feed device can then normally come into operation.
  • thermostatic device precluding in all cases intervention of the additional fuel feed device when the engine is warm.
  • FIGS. 5 and 6 show 'l'wo embodiments of such devices.
  • a thermostatic element 30 of known type is responsive to the temperature of the engine-cooling water 3,.
  • the finger member 301: of this thermostatic element acts on a valve 32 which controls an orifice 33 for entry of air to the upper part of the well 14.
  • the valve 32 opens the orifice 33 and there cannot occur in the upper part of the well 14 a depression which would be sufficient to allow the fuel to reach the passageway 17.
  • a thermostatic element 35 is still subjected to the temperature of the engine-cooling water 36. Its finger member 3511 is here employed as a closure member for the passageway 17. When the temperature of the water is sufficient. the passageway 17 is closed and thus renders the additional fuel feed device inoperative.
  • a carburetor structure for an internal combustion engine comprising means defining an induction pipe.
  • a carburetor float chamher a main fuel feed circuit having an outlet opening into the induction pipe in the vicinity of the throat and a fuel inlet communicating with the float chamber and an air inlet.
  • a fuel-air mixture regulating butterfly member disposed downstream of the throat with respect to the direction of the flow of the fuel mixture in the induction pipe.
  • an engine starting flap located upstream of the throat with respect to said flow and movable b'etwecn a first position for opening the induction pipe and a second position for substantially closing the induction pipe
  • an additional fuel feed device comprising a closed fuel well which has a lower part in communication with the float chamber and an upper end in the vicinity of which upper end the well comprises an air inlet and a fuel outlet opening onto the induction pipe downstream of the starting flap with respect to said flow and in the vicinity of the starting flap when the starting flap is substantially in said second position
  • said air inlet of the well comprising an open-ended air inlet tube for connection to air which tube extends downwardly in the well from adjacent said upper end of the well to below said fuel outlet and defines an orifice which is located in an upper part of the well and puts the interior of the inlet tube in communication with the upper part of the well.
  • a carburetor structure as claimed in claim 1, comprising means associated with the additional fuel feed device for neutralizing the additional fuel feed device under predetermined conditions of operation of an engine for which the carburetor structure is intended, the neutralizing means comprising an orifice for communication with outside air located in the upper part of the well, a closure member for selectively opening and closing said air communication orifice.
  • a diaphrahm operatively connected to the closure member, means for subjecting the diaphragm to opposing actions of the depression prevailing in the induction pipe downstream of the butterfly member and of a resiliently yieldable return means.
  • a carburetor structure as claimed in claim 1, said fuel outlet of the well comprising a conduit connecting the well to the induction pipe, means being associated with the additional fuel feed device for neutralizing the additional fuel feed device under predetermined conditions of operation ofan engine for which the carburetor structure is intended.
  • the neutralizing means comprising a closure member inserted in the conduit for selectively opening and closing the conduit. a diaphragm operatively connected to the closure member for actuating the closure member, means for subjecting the diaphragm to opposing actions of the depression prevail ing in the induction pipe downstream of the butterfly member and of a resiliently yieldable return means.
  • a carburetor structure as claimed in claim 1, comprising means associated with the additional fuel feed device for neutralizing the additional fuel feed device under predetermined conditions of operation of an engine for which the carburetor structure is intended.
  • the neutralizing means comprising an orifice for communication with outside air located in the upper part of the well, a closure member for selectively opening and closing said air communication orifice and a thcrmothe well to the induction pipe.
  • the neutralizing means comprising a closure member inserted in the conduit for selectively opening and closing the conduit, and a thermostatic element operatively connected to the closure member for shifting the closure member in response to variations in the temperature of cooling fluid for the engine for which the carburetor structure is intended.
  • a carburetor structure for an internal combustion engine comprising means defining an induction pipe, a throat in the induction pipe, a carburetor float chamher, a main fuel feed circuit having an outlet opening into the induction pipe in the vicinity of the throat and a fuel inlet communicating with the float chamber and an air inlet, a fuel-air mixture regulating butterfly member disposed downstream of the throat with respect to the direction of the flow of the fuel mixture in the induction pipe, an engine starting flap disposed upstream of the throat with respect to said flow and movable between a first position for opening the induction pipe and a second position for substantially closing the induction pipe, an additional fuel feed device comprising a closed fuel well which has a lower part in communication with the float chamber and an upper end in the vicinity of which upper end the well comprises an air inlet and a fuel outlet opening onto the induction pipe downstream of the starting flap with respect to said flow and in the vicinity of the starting flap when the starting flap is substantially in said second position, said air inlet of the well comprising an open-

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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)
US351636A 1972-05-29 1973-04-16 Carburetor devices Expired - Lifetime US3903214A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7219179A FR2187022A5 (enExample) 1972-05-29 1972-05-29

Publications (1)

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US3903214A true US3903214A (en) 1975-09-02

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US351636A Expired - Lifetime US3903214A (en) 1972-05-29 1973-04-16 Carburetor devices

Country Status (6)

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US (1) US3903214A (enExample)
DE (1) DE2319722A1 (enExample)
FR (1) FR2187022A5 (enExample)
GB (1) GB1396643A (enExample)
IT (1) IT980115B (enExample)
SE (1) SE398533B (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4096839A (en) * 1976-02-24 1978-06-27 Stromberg-Carlson Corporation Internal combustion engine air-fuel ratio control system utilizing oxygen sensor
US5879595A (en) * 1997-03-19 1999-03-09 Holtzman; Barry L Carburetor internal vent and fuel regulation assembly

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2977948A (en) * 1957-11-25 1961-04-04 Holley Carburetor Co Automatic carburetor primer
US3346245A (en) * 1964-11-16 1967-10-10 Sibe Carburetors for internal combustion engines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2977948A (en) * 1957-11-25 1961-04-04 Holley Carburetor Co Automatic carburetor primer
US3346245A (en) * 1964-11-16 1967-10-10 Sibe Carburetors for internal combustion engines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4096839A (en) * 1976-02-24 1978-06-27 Stromberg-Carlson Corporation Internal combustion engine air-fuel ratio control system utilizing oxygen sensor
US5879595A (en) * 1997-03-19 1999-03-09 Holtzman; Barry L Carburetor internal vent and fuel regulation assembly

Also Published As

Publication number Publication date
IT980115B (it) 1974-09-30
SE398533B (sv) 1977-12-27
FR2187022A5 (enExample) 1974-01-11
GB1396643A (enExample) 1975-06-04
DE2319722A1 (de) 1973-12-13

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