US3618581A - Carburetors for internal combustion engines - Google Patents

Carburetors for internal combustion engines Download PDF

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Publication number
US3618581A
US3618581A US854040A US3618581DA US3618581A US 3618581 A US3618581 A US 3618581A US 854040 A US854040 A US 854040A US 3618581D A US3618581D A US 3618581DA US 3618581 A US3618581 A US 3618581A
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US
United States
Prior art keywords
orifice
fuel
rod
obturator
reduced pressure
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
US854040A
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English (en)
Inventor
Jocelyn Elie Louis Simonet
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.)
Societe du Carburateur Zenith SA
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Societe du Carburateur Zenith SA
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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
    • F02M5/00—Float-controlled apparatus for maintaining a constant fuel level
    • F02M5/10—Float-controlled apparatus for maintaining a constant fuel level having means for preventing vapour lock, e.g. insulated float chambers or forced fuel circulation through float chamber with engine stopped
    • 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
    • F02M3/00—Idling devices for carburettors
    • F02M3/02—Preventing flow of idling fuel
    • 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
    • Y10S123/11—Antidieseling
    • 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
    • Y10S261/74—Valve actuation; electrical
    • 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
    • Y10S261/81—Percolation control

Definitions

  • the temperature of the feeding devices, and in particular that of the carburetor rises, since these devices are no longer cooled as is the case during running by.the arrival of fresh air and combustible gases.
  • the fuel contained in the carburetor begins to boil at one or more points, and the pressure produced is sufficient to force liquid fuel through the principal spray outlet of the carburetor.
  • the liquid fuel thus driven out generally remains on the accelerator control butterfly, then in the closed position.
  • the motor is finally restarted, the liquid fuel passes into the inlet manifold and into the cylinders entraining an excessively rich mixture which will not ignite. It is thus necessary, in order to start the engine, to keep the butterfly wide open and, on an automobile vehicle, to turn over the engine with the starter for a few seconds.
  • the phenomenon is of maximum effect about minutes after stopping the motor. For a shorter time, the fuel expelled from the carburetor is in very small quantity, so the mixture formed, less rich, is more easily inflammable; for a longer time, the motor has started to cool, and as a result the vaporization of the liquid fuel in the inlet manifold is slower, from which a similarly less rich mixture results.
  • the object of the invention is to avoid the disadvantages generated by the boiling of the fuel in the carburetor by stopping the liquid fuel from being projected onto the butterfly when the motor is stopped.
  • a carburetor comprising an exit orifice for fuel into the inlet manifold for normal running, fed by a constant level chamber, which does not supply fuel when the motor is stopped, characterized by a device for avoiding the escape of liquid fuel by percolation into the inlet manifold, this device comprising, on the liquid path leading from the constant level chamber to the exit orifice in normal running in the inlet manifold, an obturator for this path, and means enabling, on starting of the motor, the opening of this obturator, and means for closing it on stopping thereof.
  • the obturator is preferably formed by a rod axially displaceable by the said opening and closure means, so as to act either axially in the manner of a valve in the linking channel from the chamber to the inlet manifold, or transversely to this channel in the fashion of a slide valve.
  • the control means for the rod can be a manually operable linkage.
  • the rod can also be moved axially against a spring which tends to keep the obturator shut by means of a solenoid energized at the same time as the ignition coil of the motor, i.e. actuated by the ignition key switch.
  • the movement of the obturator against a spring which keeps it closed can also be obtained automatically by the effect of the reduced pressure which is present in the inlet manifold during running.
  • a piston or membrane closing a chamber which is put under reduced pressure by its connection to a suitably chosen portion of the inlet manifold.
  • the action of the reduced pressure alone may be insufficient, for it is known that the reduction in pressure in the inlet manifold becomes negligible when, for example, as the engine picks up, a wide opening of the butterfly is associated with low running of the motor.
  • the chamber under reduced pressure may communicate with the inlet manifold via an automatic valve.
  • the said chamber is thus kept at the maximum reduced pressure despite variations of pressure in the manifold.
  • FIG. 1 shows a carburetor in section according to the invention, which uses an electromagnetic force to operate the obturator.
  • FIG. 2 is a similar view of a variant which uses the reduced pressure for this purpose.
  • FIGS. 3 and 4 which are at least in part sections of one another along the lines IIIIII and IV-IV of FIGS. 4 and 3, show a variant which uses the reduced pressure.
  • FIG. 5 is a partial section of a variant also using the reduced pressure.
  • FIG. 6 shows, again in section, a constructional variant in which the reduced pressure alone is used, but with preservation thereof by a valve.
  • FIG. 7 is a detail of FIG. 6 according to arrow VII.
  • FIG. 8 shows in section an embodiment in which a manual control is associated with the effect of the reduced pressure.
  • FIG. 9 shows in similar view an embodiment in which the reduced pressure control is linked to the accelerator control.
  • This carburetor comprises an air arrival body 1 in which pivots a shutter 2, a central body 3 which comprises the constant level chamber 4 and the inlet venturi 5, and last the connection to the inlet manifold with the pivoting mixture volume shutter or fuel butterfly 7.
  • the constant level chamber 4 contains in classic fashion the float 8 rocking about the axis 9 and bearing on the needle 10 which shuts off more or less the flow of combustible liquid 1 I.
  • the chamber 4 communicates with the inlet manifold via a channel I2, the supply to which is fixed by the normal running jet 13, and which contains the mixer tube 14 for mixing the combustible liquid with the air led through channel 15 and arriving at this mixer apparatus across one or more air bores 16.
  • this channel opens into the primary venturi 17 within the secondary venturi 5 via the bored conduit l8. This air and combustible material reach the mixing chamber formed by the downstream part of venturi 5.
  • an obturator closes the linking channel from the chamber to the primary venturi 17 between the jet l3 and the orifice 18a of conduit 18.
  • this obturator is a rod 20 ending in a point 200 which fits axially into the orifice 18a which is terminated by a suitable seating for the point.
  • This rod is biased by a spring 21 and it is integral with a plunger core 22 moveable axially in a coil 23 carried in the magnetic cavity formed by base 24 and casing 25. This latter is connected to the central body 3 of the carburetor by screwing.
  • the coil 23 When the motor is to be put to use, the coil 23 is energized via wire 26 at the same time as the ignition coil, by means of the usual key switch.
  • the core 22 is drawn in and it keeps the point 20a separated from orifice 18a. The boring of the passage of the rod 20 across the wall of the primary venturi 17 ensures the guidance of this rod during its axial motion.
  • the rod 20 is integral with a piston 27 moveable in a bore 28, which toward the rear, communicates via bored channels 29 with the orifice 30 situated below the butterfly 7 and with the orifice 3I situated at the mouth of the primary venturi 17 in the neck of the secondary venturi 5.
  • the piston 27 forms in the bore 28 a chamber 32 under reduced pressure communicating with the channels 29, and a space 33 connected to the atmosphere via channels 34.
  • the spring 21 keeps the rod 20 in closure position (shown in dotted lines) in orifice 18a.
  • the reduced pressure acts, created in the inlet manifold by the inspiration of the cylinders.
  • the reduced pressure arises in chamber 32 via orifice 30.
  • the reduced pressure is generated by orifice 31, since the position chosen for this orifice corresponds to the maximum reduction in pressure in the venturi 5.
  • the diameter of the orifice 31 should be substantially smaller than that of orifice 30 in order that when the butterfly is closed, the entry of air via orifice 31 does not cancel out the effect of the reduced pressure acting via orifice 30.
  • FIGS. 3 and 4 on the one hand, and FIG. on the other, show two examples of obturation at different points on the channel.
  • the obturator is a rod 35 forming a slide valve which runs transversely in a bore in arm 36 bearing the venturi 17, which arm is axially traversed by conduit 18. Pressed by spring 21, the rod 35 obturates the channel 18; it frees it when the reduced pressure acting in chamber 32 displaces the piston 27 to the left as seen in FIG. 3.
  • the end point 40a of the rod 40 closes the channel 12 at the exit of jet 13.
  • the quantity of fuel trapped in the tube 14 which, by percolation, could escape via the tube 18, is considered negligible.
  • the flapping valve On stopping, air enters chamber 32 via the play of cylinder 27 in the bore 28. If this play is insufficient or if, in place of a piston, there is used a membrane for controlling the rod 20, the flapping valve can have a small hole 45 at its center.
  • FIGS. 8 and 9 show constructions in which the risks attendant on a drop in the reduction of pressure in the chamber 32 are even more positively alleviated.
  • the prolongation 20b of the rod 20 is engaged in a lever 46 joined to a cable or a thin rod moveable by a manually operable pull.
  • the lever 50 acting on the projection 20b is, on the opposite side with respect to its fulcrum, joined by the rod 51 to the crank 52 of the butterfly control 7 (or to any other point on the accelerator linkage).
  • the compression spring 53 allows an extra displacement of the rod 5 la when the lever 50 has already reached the position 50, of total opening ofthe obturator 200.
  • the reduced pressure serves on starting to open the obturator 20a after which, when one presses on the accelerator, the pressure exercised thereon is associated with the reduced pressure to keep the obturator open.
  • Rod 51 and spring 53 can be replaced, for example, by a cam of suitable shape fixed to rotate about axis 52 (or a parallel axis) which on the starting of rotation of axis 52 rocks the lever 50 completely and then maintains it in this position. Other mechanisms ensuring this result can be used.
  • a carburetor for an internal combustion engine having an ignition coil and a key switch for controlling the circuit of said ignition coil
  • said carburetor including an exit orifice for fuel located on one side with respect to an inlet manifold to which said fuel is delivered for normal running, constant level chamber for feeding said orifice with fuel through a liquid path
  • the improvement consisting in an obturator in the form ofa rod on said liquid path and having a pointed end which engages said orifice, which rod transversely passes through said manifold and, outside thereof, is urged in direction of said orifice by a coaxial coil spring and in opposite direction by a coaxial electromagnet coil, the coil of said electromagnet being fed by the same circuit as the ignition coil.

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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)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
US854040A 1968-09-05 1969-08-29 Carburetors for internal combustion engines Expired - Lifetime US3618581A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR165165 1968-09-05

Publications (1)

Publication Number Publication Date
US3618581A true US3618581A (en) 1971-11-09

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US854040A Expired - Lifetime US3618581A (en) 1968-09-05 1969-08-29 Carburetors for internal combustion engines

Country Status (4)

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US (1) US3618581A (enrdf_load_stackoverflow)
DE (1) DE1944166A1 (enrdf_load_stackoverflow)
FR (1) FR1586471A (enrdf_load_stackoverflow)
GB (1) GB1283764A (enrdf_load_stackoverflow)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805760A (en) * 1972-11-27 1974-04-23 Honda Motor Co Ltd Run-on prevention device for internal combustion engines
US3834679A (en) * 1972-12-26 1974-09-10 R Baribeau Fuel injection system for internal combustion engine
US3920778A (en) * 1974-06-26 1975-11-18 Rugeris John De Carburetor apparatus having an improved fuel metering arrangement
US3931814A (en) * 1972-09-28 1976-01-13 Regie Nationale Des Usines Renault Cylinder-induction responsive electronic fuel feed control carburetors
US3994356A (en) * 1975-06-06 1976-11-30 Colt Industries Operating Corporation Safety shut-off fuel system
US4050436A (en) * 1976-03-17 1977-09-27 Crabtree Roger A Idle system blocking means
US4076770A (en) * 1976-11-16 1978-02-28 Toyota Jidosha Kogyo Kabushiki Kaisha Carburetor with auxiliary accelerator-pump system
US4111176A (en) * 1977-05-11 1978-09-05 Kohler Co. Engine shutdown control
US4124662A (en) * 1974-05-02 1978-11-07 Nissan Motor Company, Limited Carburetor and method of operating same
US4157366A (en) * 1978-03-13 1979-06-05 Acf Industries, Incorporated Apparatus for venting fuel vapors
US4244334A (en) * 1977-03-14 1981-01-13 Robert Bosch Gmbh Valve actuating and control circuit
US4277424A (en) * 1979-12-21 1981-07-07 Shivers Jr Charles B Carburetor for internal combustion engines
US4283356A (en) * 1978-05-16 1981-08-11 Aisan Industry Co., Ltd. Carburetor for internal combustion engines
USRE30844E (en) * 1972-11-27 1982-01-12 Honda Giken Kogyo Kabushiki Kaisha Run-on prevention device for internal combustion engines
US4341723A (en) * 1980-08-26 1982-07-27 Hidenori Hirosawa Variable venturi carburetor
US4434110A (en) 1981-03-23 1984-02-28 Fuel Systems Management Carburetor, control apparatus and method for internal combustion engines
US5069174A (en) * 1989-03-30 1991-12-03 Sanshin Kogyo Kabushiki Kaisha Fuel supplying device for marine propulsion engine
US20050274364A1 (en) * 2004-06-14 2005-12-15 Kirk J D Evaporative emissions control system for small internal combustion engines
US7185639B1 (en) 2004-09-30 2007-03-06 Walbro Engine Management, L.L.C. Evaporative emission controls
US7216635B1 (en) 2004-09-30 2007-05-15 Walbro Engine Management, L.L.C. Evaporative emission controls in a fuel system
US20090293828A1 (en) * 2008-05-27 2009-12-03 Briggs & Stratton Corporation Engine with an automatic choke and method of operating an automatic choke for an engine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2009109A (en) * 1931-11-14 1935-07-23 Bendix Aviat Corp Carburetor
US2131848A (en) * 1936-06-16 1938-10-04 Conrad R Robidoux Carburetor
US2445097A (en) * 1943-12-27 1948-07-13 Bendix Aviat Corp Carburetor
AT175416B (de) * 1951-08-06 1953-07-10 Ferdinand Stary Einrichtung an Auf- oder Fallstromvergasern mit oder ohne Pumpe zum Absperren der Brennstoffzufuhr zwischen Brennstoffdüse und Schwimmergehäuse
FR1118214A (fr) * 1954-01-28 1956-06-01 Daimler Benz Ag Dispositif pour éviter, dans des moteurs à combustion interne à carburateur, la continuation de l'allumage après l'interruption du courant d'allumage
US2943615A (en) * 1955-03-23 1960-07-05 Daimler Benz Ag Air inlet control mechanism for an internal combustion engine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2009109A (en) * 1931-11-14 1935-07-23 Bendix Aviat Corp Carburetor
US2131848A (en) * 1936-06-16 1938-10-04 Conrad R Robidoux Carburetor
US2445097A (en) * 1943-12-27 1948-07-13 Bendix Aviat Corp Carburetor
AT175416B (de) * 1951-08-06 1953-07-10 Ferdinand Stary Einrichtung an Auf- oder Fallstromvergasern mit oder ohne Pumpe zum Absperren der Brennstoffzufuhr zwischen Brennstoffdüse und Schwimmergehäuse
FR1118214A (fr) * 1954-01-28 1956-06-01 Daimler Benz Ag Dispositif pour éviter, dans des moteurs à combustion interne à carburateur, la continuation de l'allumage après l'interruption du courant d'allumage
US2943615A (en) * 1955-03-23 1960-07-05 Daimler Benz Ag Air inlet control mechanism for an internal combustion engine

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3931814A (en) * 1972-09-28 1976-01-13 Regie Nationale Des Usines Renault Cylinder-induction responsive electronic fuel feed control carburetors
US3805760A (en) * 1972-11-27 1974-04-23 Honda Motor Co Ltd Run-on prevention device for internal combustion engines
USRE30844E (en) * 1972-11-27 1982-01-12 Honda Giken Kogyo Kabushiki Kaisha Run-on prevention device for internal combustion engines
US3834679A (en) * 1972-12-26 1974-09-10 R Baribeau Fuel injection system for internal combustion engine
US4124662A (en) * 1974-05-02 1978-11-07 Nissan Motor Company, Limited Carburetor and method of operating same
US3920778A (en) * 1974-06-26 1975-11-18 Rugeris John De Carburetor apparatus having an improved fuel metering arrangement
US3994356A (en) * 1975-06-06 1976-11-30 Colt Industries Operating Corporation Safety shut-off fuel system
US4050436A (en) * 1976-03-17 1977-09-27 Crabtree Roger A Idle system blocking means
US4076770A (en) * 1976-11-16 1978-02-28 Toyota Jidosha Kogyo Kabushiki Kaisha Carburetor with auxiliary accelerator-pump system
US4244334A (en) * 1977-03-14 1981-01-13 Robert Bosch Gmbh Valve actuating and control circuit
US4111176A (en) * 1977-05-11 1978-09-05 Kohler Co. Engine shutdown control
US4157366A (en) * 1978-03-13 1979-06-05 Acf Industries, Incorporated Apparatus for venting fuel vapors
US4283356A (en) * 1978-05-16 1981-08-11 Aisan Industry Co., Ltd. Carburetor for internal combustion engines
US4277424A (en) * 1979-12-21 1981-07-07 Shivers Jr Charles B Carburetor for internal combustion engines
US4341723A (en) * 1980-08-26 1982-07-27 Hidenori Hirosawa Variable venturi carburetor
US4434110A (en) 1981-03-23 1984-02-28 Fuel Systems Management Carburetor, control apparatus and method for internal combustion engines
US5069174A (en) * 1989-03-30 1991-12-03 Sanshin Kogyo Kabushiki Kaisha Fuel supplying device for marine propulsion engine
US20050274364A1 (en) * 2004-06-14 2005-12-15 Kirk J D Evaporative emissions control system for small internal combustion engines
US7165536B2 (en) 2004-06-14 2007-01-23 Tecumseh Products Company Evaporative emissions control system for small internal combustion engines
US7591251B1 (en) 2004-09-30 2009-09-22 Walbro Engine Management, L.L.C. Evaporative emission controls in a fuel system
US7216635B1 (en) 2004-09-30 2007-05-15 Walbro Engine Management, L.L.C. Evaporative emission controls in a fuel system
US7185639B1 (en) 2004-09-30 2007-03-06 Walbro Engine Management, L.L.C. Evaporative emission controls
US8240292B1 (en) * 2004-09-30 2012-08-14 Walbro Engine Management, L.L.C. Evaporative emissions controls in a fuel system
US20090293828A1 (en) * 2008-05-27 2009-12-03 Briggs & Stratton Corporation Engine with an automatic choke and method of operating an automatic choke for an engine
US20090299614A1 (en) * 2008-05-27 2009-12-03 Briggs & Stratton Corporation Engine with an automatic choke and method of operating an automatic choke for an engine
US8219305B2 (en) 2008-05-27 2012-07-10 Briggs & Stratton Corporation Engine with an automatic choke and method of operating an automatic choke for an engine
US8434445B2 (en) 2008-05-27 2013-05-07 Briggs & Stratton Corporation Engine with an automatic choke and method of operating an automatic choke for an engine
US8434444B2 (en) 2008-05-27 2013-05-07 Briggs & Stratton Corporation Engine with an automatic choke and method of operating an automatic choke for an engine

Also Published As

Publication number Publication date
DE1944166A1 (de) 1970-05-14
FR1586471A (enrdf_load_stackoverflow) 1970-02-20
GB1283764A (en) 1972-08-02

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