US3690625A - Carburetor utilizing fluidics - Google Patents

Carburetor utilizing fluidics Download PDF

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Publication number
US3690625A
US3690625A US3690625DA US3690625A US 3690625 A US3690625 A US 3690625A US 3690625D A US3690625D A US 3690625DA US 3690625 A US3690625 A US 3690625A
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United States
Prior art keywords
negative pressure
flow
fuel
passage
flow duct
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
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English (en)
Inventor
Takashi Ishida
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Mikuni Corp
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Mikuni Corp
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Publication date
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Publication of US3690625A publication Critical patent/US3690625A/en
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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
    • F02M7/10—Other installations, without moving parts, for influencing fuel/air ratio, e.g. electrical means
    • F02M7/106—Fluid amplifier as a device for influencing the fuel-air mixture
    • 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
    • Y10S123/00—Internal-combustion engines
    • Y10S123/10—Fluidic amplifier fuel control
    • 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
    • Y10S261/69—Fluid amplifiers in carburetors
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/206—Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]
    • Y10T137/212—System comprising plural fluidic devices or stages
    • Y10T137/2125—Plural power inputs [e.g., parallel inputs]

Definitions

  • ABSTRACT A carburetor whose main fuel flow system is constructed by a jet deflection proportional fluid amplifier.
  • the carburetor has a separate fluid amplifier adapted to inject a fuel for use in a slow fuel flow system by means of a negative pressure in proportion to the amount of air passing through a throttle valve opening.
  • FIG.2 1 Claim, 2 Drawing Figures P'ATE'NTED SEP 12 m2 fuel FIG.2
  • the present invention relates to a carburetor utilizing fluidics.
  • jet deflection proportional fluid amplifier so as to construct a main fuel flow system of a carburetor.
  • fluid amplifier only one jet deflection proportional fluid amplifier (hereinafter abbreviated as fluid amplifier) is adapted to be used throughout the total operation range of an engine from an instant when the engine is operated under the idling operation to an instant when the engine is operated under the high speed condition with fully opened state of a throttle valve.
  • FIG. 1 shows one example of the above mentioned conventional carburetor.
  • the carburetor comprises a fluid amplifier which includes a deflection flow passage connected to a fuel injection nozzle 16 opened to a Venturi member 17 and a control flow passage 18 connected to a negative pressure detecting nozzle 19.
  • the fluid amplifier 10 is provided at its substrate 11 with a main jet supplying port 12 connected at both sides thereof with control ports 13a and 13b, respectively.
  • the main jet supplying port 12 is connected through an interaction region 14 to output flow passages 15a" and 15b, respectively.
  • the deflection flow from the output flow passage 15a is supplied to the fuel injection nozzle 16 while the fuel from the output flow passage 15b returns to a fuel tank T.
  • 36 designates a throttle valve.
  • An object of the invention is to provide such a carburetor comprising a control negative pressure circuit constructed by a fluid amplifier for use under a light load condition so that a properarnount of fuel flow can be obtained throughout the total operation range of the engine from an instant when the engine is operated under the idling condition to an instant when the engine is operated under the high. speed condition with fully opened state of a throttle valve.
  • the above mentionedobject can be attained by a carburetor whose main fuel flow system is constructed by a jet deflection proportional fluid amplifier characterized in that provision ismade for a separate fluid amplifier adapted to inject a fuel for use in a slow fuel flow system by means of a negative pressure in proportion to the amount of air passing through a throttle valve opening.
  • FIG. 1 is a sectional view showing a conventional carburetor utilizing fluidics
  • FIG. 2 is a sectional view showing a carburetor according to the present invention.
  • a carburetor in one embodiment of the invention comprises two fluid amplifiers 10 and 20 as shown in FIG. 2.
  • the first fluid amplifier 10 comprises a main fuel flow system which is the same in construction as the conventional fluid amplifier shown in FIG. 1.
  • the second fluid amplifier 20 comprises a slow fuel flow system 35 including a deflecting flow passage 25a connected through a passage 26 to a fuel injection nozzle 29 adapted to be opened to a Venturi member 17 and including a control flow passage adapted to be opened to a portion corresponding to a pilot passage 0 a conventional carburetor.
  • the second fluid amplifier 20 is provided with a deflecting flow passage 25b which returns to a fuel tank T.
  • 24 is an interaction region connecting a main jet supplying port 12 and the flow passages 25aand 255.
  • A. negative pressure passage 28 connected to a control port 23av is provided at its intermediate portion with a reduced section 27 and provided at its end with a boost hole 31 and negative pressure holes 32 and 33.
  • the boost hole 31 is adjusted by a screw 30.
  • the negative pressure holes 32 and 33 are arrangedadjacent to the boost hole 3lfand are adapted to be operated to stop compensating fuel supplied to the nozzle 29 when a throttle valve 36 is closed and to inject the fuel from the slow fuel flow system 35 in proportion to a slight opening of thethrottle valve 36.
  • the negative pressure passage 28 is provided immediately after itsreduced section 27 with a negative pressure drop down screw 34 whichis connected to an air inlet 37 arranged at one side of the screw 34.
  • the carburetor shown in FIG. 2 comprises the first fluid amplifier l0 constituting a main fuel flow system and the second fluid amplifier 20 whose circuit is connected to the control port 234 adapted to receive negative pressure for deflecting a main jet stream through a circuit which is substantially the same as the slow fuel flow system of the conventional carburetor.
  • the boost hole 31 and the negative pressure hole 32 correspond to so'called pilot outlet bypasses, respec tively, of the conventional carburetor.
  • the boost hole 31 and negative pressure hole 32 serve to adjust the degree of negative pressure to be introduced into the negative pressure passage 28 with the aid of the adjusting screw 30.
  • 'Ihe negative pressure hole 32 serves to detect the negative pressure generated due to the speed of air stream passing through the throttled portions in response to the degree of opening of the throttle valve
  • the screw 30 adjusted and the position, numbers, diameter etc. of the negative pressure holes of the slow fuel flow system 35 ensure a generation of the negative
  • the addition of the separate fluid amplifier 20 to the first fluid amplifier makes it possible to properly adjust the amount of fuel flow when the engine is operated at no load or low load condition.
  • the above mentioned construction is also capable of properly adjusting the amount of fuel flow in an easy manner when'the engine is operated at light load or partial load condition.
  • the conventional carburetor whose fuel system is constructed by one fluid amplifier only has a considerable difliculty in obtaining a proper amount of fuel flow both when the engine is operated under no load or light load condition and when the engine is operated under heavy load condition
  • the addition of a separate fluid amplifier for use under the light load condition to the conventional fluid amplifier so as to construct a control negative pressure circuit according to the invention provides the important advantage that a proper amount of fuel flow can be obtained throughout the total operation range of the engine from an instant when the engine is operated under the idling condition to an instant when the engine is operated under the high speed condition with fully opened state of the throttle valve.
  • a carburetor comprising first means forming a main fuel flow system, said first'means including a tubular flow duct for the passage of air therethrough, a Venturi member providing an annular constriction in said flow duct intermediate its ends, a throttle member positioned in said flow duct downstream in the direction of air flow therethrough from said Venturi member, a first jet deflection proportional fluid amplifier, a fuel injection nozzle opening into said flow duct at the location of said Venturi member, an output flow passage connecting said first fluid amplifier to said fuel injection nozzle, a negative pressure detecting nozzle opening into said flow duct at the location of said Venturi member, a control flow passage connecting said negative pressure detecting nozzle to said first fluid amplifier, wherein the improvement comprises second means forming a slow fuel flow system separate from said main fuel flow system, said second means including a second jet defection proportional fluid amplifier for injecting fuel into said flow duct, a second fuel injection nozzle opening into said flow duct at the location of said Venturi member for injecting fuel into said duct,

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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)
US3690625D 1969-08-18 1970-08-17 Carburetor utilizing fluidics Expired - Lifetime US3690625A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6522969 1969-08-18

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US3690625A true US3690625A (en) 1972-09-12

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US3690625D Expired - Lifetime US3690625A (en) 1969-08-18 1970-08-17 Carburetor utilizing fluidics

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US (1) US3690625A (enrdf_load_stackoverflow)
GB (1) GB1290975A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938486A (en) * 1974-04-18 1976-02-17 Borg-Warner Corporation Pneumatically controlled fuel injection system
US4034724A (en) * 1976-04-14 1977-07-12 Flanagan Richard P Stratified charging of internal combustion engines
US4043303A (en) * 1974-06-24 1977-08-23 Consiglio Nazionale Delle Ricerche Air-fuel ratio control system for internal-combustion engines with controlled ignition
US4205643A (en) * 1975-12-01 1980-06-03 Societe Anonyme Pour L'equipement Electrique Des Vehicules S.E.V. Marchal Device for supplying fuel to an internal combustion engine
US5843345A (en) * 1995-12-22 1998-12-01 Briggs & Stratton Corporation Pneumatic accelerator for low emission charge forming devices

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2123129C1 (ru) * 1995-05-26 1998-12-10 Научно-исследовательский институт машиностроения Главного управления ракетно-космической техники Комитета РФ по оборонным отраслям промышленности Смесительная головка
RU2136915C1 (ru) * 1998-01-28 1999-09-10 Военная академия бронетанковых войск Устройство распыла жидкости в цилиндрах двигателя
RU2136916C1 (ru) * 1998-07-29 1999-09-10 Военная академия бронетанковых войск Устройство для впрыска жидкости в цилиндры двигателя

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3288446A (en) * 1965-03-29 1966-11-29 Bendix Corp Carburetor
US3389894A (en) * 1965-10-11 1968-06-25 Alan M Binder Fuel induction device
US3406951A (en) * 1965-09-16 1968-10-22 Gen Motors Corp Fluid amplifier arrangement and fuel system incorporating same
US3556488A (en) * 1968-07-10 1971-01-19 Aisan Kogyo Co Ltd Carburetor with fluid elements
US3570823A (en) * 1968-07-12 1971-03-16 Aisan Kogyo Co Ltd Carburetor with fluid amplifying elements
US3574346A (en) * 1968-08-21 1971-04-13 Bendix Corp Fuel system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3288446A (en) * 1965-03-29 1966-11-29 Bendix Corp Carburetor
US3406951A (en) * 1965-09-16 1968-10-22 Gen Motors Corp Fluid amplifier arrangement and fuel system incorporating same
US3389894A (en) * 1965-10-11 1968-06-25 Alan M Binder Fuel induction device
US3556488A (en) * 1968-07-10 1971-01-19 Aisan Kogyo Co Ltd Carburetor with fluid elements
US3570823A (en) * 1968-07-12 1971-03-16 Aisan Kogyo Co Ltd Carburetor with fluid amplifying elements
US3574346A (en) * 1968-08-21 1971-04-13 Bendix Corp Fuel system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938486A (en) * 1974-04-18 1976-02-17 Borg-Warner Corporation Pneumatically controlled fuel injection system
US4043303A (en) * 1974-06-24 1977-08-23 Consiglio Nazionale Delle Ricerche Air-fuel ratio control system for internal-combustion engines with controlled ignition
US4205643A (en) * 1975-12-01 1980-06-03 Societe Anonyme Pour L'equipement Electrique Des Vehicules S.E.V. Marchal Device for supplying fuel to an internal combustion engine
US4034724A (en) * 1976-04-14 1977-07-12 Flanagan Richard P Stratified charging of internal combustion engines
US5843345A (en) * 1995-12-22 1998-12-01 Briggs & Stratton Corporation Pneumatic accelerator for low emission charge forming devices

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GB1290975A (enrdf_load_stackoverflow) 1972-09-27

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