US3661367A - Carburetors for internal combustion engines - Google Patents

Carburetors for internal combustion engines Download PDF

Info

Publication number
US3661367A
US3661367A US131940A US3661367DA US3661367A US 3661367 A US3661367 A US 3661367A US 131940 A US131940 A US 131940A US 3661367D A US3661367D A US 3661367DA US 3661367 A US3661367 A US 3661367A
Authority
US
United States
Prior art keywords
channel
constant level
carburetor
fuel
passage
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
US131940A
Other languages
English (en)
Inventor
Andre Louis Mennesson
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 Industrielle de Brevets et dEtudes SIBE
Original Assignee
Societe Industrielle de Brevets et dEtudes SIBE
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 Societe Industrielle de Brevets et dEtudes SIBE filed Critical Societe Industrielle de Brevets et dEtudes SIBE
Application granted granted Critical
Publication of US3661367A publication Critical patent/US3661367A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F02M3/00—Idling devices for carburettors
    • F02M3/08—Other details of idling devices
    • 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
    • F02M3/06—Increasing idling speed
    • 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
    • F02M7/02—Carburettors having aerated fuel spray nozzles
    • 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
    • Y10S261/19—Degassers

Definitions

  • the carburetor has a fuel/air mixture supply circuit constituted by the sequence of an ascending channel connected to I a float chamber through an immersed calibrated orifice and a descending channel with an opening intothe intake pipe of the carburetor downstream of the main throttle member of this pipe.
  • the descending channel is controlled by a member which opens it only during periods of deceleration of the engine.
  • the linking zone between the two channels is above the constant level of the float chamber and connected through an air passage having a second calibrated orifice, to an air intake zone of the carburetor other than that connected to the upper portion of the float chamber.
  • the ascending channel has a further calibrated orifice above the constant level and communicates with the space above the constant level through a passage of small cross-section opening into the ascending channel between its two calibrated orifices and also itself above the constant level.
  • the assembly reduces the suction in the ascending channel to an extent insufficient or sufficient to stop the fuel being sucked into the descending channel according as the closure member is open or not.
  • the invention relates to carburetors, for internal combustion engines, of the type which comprise a circuit for supplying fuel mixed with air constituted by the succession of an ascending channel which is connected to a float chamber through an immersed calibrated orifice and of a descending channel which ends in the intake pipe of the carburetor downstream of the main throttle member of this pipe and which is controlled by an obturating member adapted to free it only during periods of deceleration of the engine, the linking zone between the two channels being situated above the constant level of the float chamber and connected, through an aerating passage provided with a second calibrated orifice, to an air intake zone of the carburetor different from that by which the upper portion of thefloat chamber is connected to this air intake by an equilibrating passage in order to be subjected to a pressure substantially
  • this obturating member is actuated by a capsule adapted to beconnected, to the zone of the, intake pipe of the carburetor situated downstream of its'main throttle member, by an electromagnetic valve controlled byan electronicdevice sensitive to the speed of the engine or, at least, of the vehicle driven normally by this engine.
  • the assembly is then such that the above-mentioned obturating member is only open when, simultaneously, the electronic device registers a high speed and the capsule a strong suction which corresponds to the closing of the main throttle member.
  • the abovesaid obturating member is actuated by a first capsule sensitive to the suction which exists in the zone of the intake pipe of the carburetor situated downstream of its main throttle memberand which itself is transmitted through a second capsule sensitive to the suction existing at a point of the intake pipe situated so as to pass from downstream to upstream of the main throttle member when the latter is partly opened, the first capsule being arranged so as to be subjected to atmospheric pressure when the said obturating member is closed.
  • the supply circuit during periods of deceleration when the obturating member is consequently open, delivers a mixture. of fuel taken from the float chamber through the ascending channel and of air taken through the air passage in the air intake of thecarburetor.
  • the upper portion of the float chamber occurs at a pressure greater than that of the linking zone between the ascending and descending channels of the abovesaid supply circuit.
  • the carburetor of the type defined above is characterized, according to the invention, by the fact that the ascending channel comprises, in addition to the immersed calibrated orifice, a calibrated orifice situated above the constant level of the fuel in the float chamber and communicates with the portion of the float chamber situated above this level through a passage of small section opening into this channel between its two calibrated orifices and situated itself also above the constant level, the assembly being such that the said passage reduces the suction existing in the ascending channel to an extent insufficient or sufficient to prevent the fuel from being sucked up to the descending channel according as the obturating member of the latter is open or not respectively.
  • the carburetor as a whole, it is constructed in any suitable manner such that is comprises a supply circuit for fuel mixed with air constituted by the succession of an ascending channel 1, connected to a constant level N reservoir 2, (this level being generally regulated by a float 3) through an immersed calibrated orifice 4, and by a descending channel 5 which ends in the intake pipe 6 of the carburetor downstream of the-main throttle member (or butterfly valve) 7 of this pipe and which is controlled by an obturating member or needle valve 8 adapted to free this channel 5 during periods of deceleration of the engine.
  • a supply circuit for fuel mixed with air constituted by the succession of an ascending channel 1, connected to a constant level N reservoir 2, (this level being generally regulated by a float 3) through an immersed calibrated orifice 4, and by a descending channel 5 which ends in the intake pipe 6 of the carburetor downstream of the-main throttle member (or butterfly valve) 7 of this pipe and which is controlled by an obturating member or needle valve 8
  • the linking zone 9 between the channels 1 and 5 is situated above the level N and connected, through an aerating passage 10 provided with a calibrated orifree 11, to an air intake zone l2 of the carburetor different from that through which the upper portion of the reservoir 2 is connected to this air intake, through an equilibrating passage 13, in order to be subjected to a pressure substantially equal to atmospheric pressure.
  • the obturating member 8 is placed between a calibrated orifice 14 opening into the pipe 6 and a chamber 15 where the descending channel 5 ends.
  • This member 8 is actuated by a capsule constituted for example by a chamber 16 bounded by a diaphragm 17 which bears the member 8, this chamber 16 being connected through two successive channels 18 and 19 to a zoneof the pipe 6 situated downstream of the throttle member 7 at least when the latter is closed.
  • an obturating member 20 controlled by means 21 such that it does not make the channels 18 and 19 communicate between themselves except when the speed of the engine exceeds a certain limit.
  • the origin 22 of the channel 19 is preferably situated so as to pass from downstream to upstream of the main'throttle member 7 when the latter is moved from the idling position shown.
  • a spring 23 acts on the diaphragm 17 in the direction opposite to the suction existing in the chamber 16 and tends thus to close the obturating member 8 and an air intake regulated through a calibrated orifice 24 is provided on the channel 18 and/or the chamber 16 so that atmospheric pressure is established there when the obturating member 20 is closed (i.e. at low or nil speeds of the engine).
  • the carburetor also includes:
  • a main jetting circuit (not shown) constituted by a channel, supplied with fuel by the reservoir 2, which opens into the pipe 6 upstream of the main throttle member 7 and at the level of a venturi 25;
  • a channel 26 taking fuel through an orifice 27 and generally in the main jetting circuit and air through an orifice 28 in the air intake 12, which channel opens into the pipe 6, on one hand, through an idling orifice 29 regulated by a screw 30 and opening downstream of the main throttle member 7 and, on the other hand, by orifices called transfer" orifices 31 situated so as to pass from upstream to downstream of this member 7 when the latter is partly opened.
  • the obturating member 8 frees the orifice 14, which thus allows to pass into the pipe 6 a mixture of air and fuel arriving respectively through the orifices 11 and 4, which mixture is added to that delivered through the idling orifice 29 to improve the combustion conditions in the cylinders of the engine and thus to reduce the emission of pollutant products in the exhaust gas.
  • the obturating member 8 is closed. Pressure in the zone 9 is slightly less than that which exists in the reservoir 2, due to the fact that the orifice 11 and the equilibrating passage 13 are not situated and oriented in the same manner in the air intake 12. As a result, the level N of the fuel in the ascending channel 1 rises into this zone 9 and, from there, flows into the descending channel where it accumulates. At the beginning of the deceleration period which follows, the pipe 6 receives the unmixed quantity of fuel which is thus accumulated and which unduly enriches the mixture admitted into the cylinders of the engine.
  • the ascending channel 1 comprises, in addition to the immersed calibrated orifice 4, a calibrated orifice 32 situated above the constant level N in the reservoir 2 and communicates, with the portion 2a of the reservoir situated above this level N, through a passage of small section or a calibrated orifice 33 opening into the channel 1 between its two calibrated orifices 4 and 32 and situated itself also above the level N, the assembly (and especially the cross-sections of the orifices 4, 32 and 33) being such that the said passage 33 reduces the suction existing in the ascending channel 1 to an extent insufficient or sufficient to prevent the fuel from being sucked up to the descending channel 5 according as the obturating member 8 of the latter is respectively open or not.
  • Carburetor for internal combustion engines which comprises a circuit for the supply of fuel mixed with air constituted by the sequence of an ascending channel which is connected to a constant level chamber through an immersed calibrated orifice and of a descending channel with an opening into the intake pipe of the carburetor downstream of the main throttle member of this pipe and which descending channel is controlled by an obturating member adapted to free it only during periods of deceleration of the engine, the linking zone between the two channels being situated above said constant level and connected, through an air passage provided with a second calibrated orifice, to an air intake zone of the carburetor different from that by which the upper portion of the float chamber is connected to this air intake zone through an equilibrating passage in order to be subjected to a pressure substantially equal to atmospheric pressure, characterized by the fact that the ascending channel comprises, in addition to the immersed calibrated orifice, a calibrated orifice situated above the constant level of the fuel in the reservoir and communicates with the portion of the reservoir situated

Landscapes

  • 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)
US131940A 1970-04-17 1971-04-07 Carburetors for internal combustion engines Expired - Lifetime US3661367A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7014054A FR2088608A5 (enrdf_load_stackoverflow) 1970-04-17 1970-04-17

Publications (1)

Publication Number Publication Date
US3661367A true US3661367A (en) 1972-05-09

Family

ID=9054192

Family Applications (1)

Application Number Title Priority Date Filing Date
US131940A Expired - Lifetime US3661367A (en) 1970-04-17 1971-04-07 Carburetors for internal combustion engines

Country Status (6)

Country Link
US (1) US3661367A (enrdf_load_stackoverflow)
BR (1) BR7101803D0 (enrdf_load_stackoverflow)
DE (1) DE2105268A1 (enrdf_load_stackoverflow)
ES (1) ES194197Y (enrdf_load_stackoverflow)
FR (1) FR2088608A5 (enrdf_load_stackoverflow)
SE (1) SE358209B (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3847125A (en) * 1972-01-27 1974-11-12 A Malherbe Carburetor
US3866588A (en) * 1972-04-28 1975-02-18 Toyota Motor Co Ltd Device for supplying secondary air to a gas engine intake manifold
DE2553699A1 (de) * 1974-11-30 1976-08-12 Fuji Heavy Ind Ltd Verbrennungskraftmaschine fuer motorfahrzeuge
US4007237A (en) * 1975-04-19 1977-02-08 Toyota Jidosha Kogyo Kabushiki Kaisha Compensation apparatus for carburetor
US5591383A (en) * 1995-04-25 1997-01-07 Krup; William R. Carburetor and metering device therefor
US5843345A (en) * 1995-12-22 1998-12-01 Briggs & Stratton Corporation Pneumatic accelerator for low emission charge forming devices
US7398962B2 (en) 2005-07-11 2008-07-15 Patrick Cooper Quick jet change fuel float bowl
US20100176519A1 (en) * 2007-05-25 2010-07-15 Omarsson Kristjan Bjoern Carburettors

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2824726A (en) * 1955-11-08 1958-02-25 Gen Motors Corp Degasser attachment for internal combustion engines
US2877998A (en) * 1956-06-29 1959-03-17 Holley Carburetor Co Apparatus for controlling the admission of fuel and air to an internal combustion engine
US2993485A (en) * 1959-01-12 1961-07-25 Holley Carburetor Co Intake manifold vacuum actuated fuel shut-off apparatus
US3503594A (en) * 1967-08-28 1970-03-31 Toyota Motor Co Ltd Fuel system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2824726A (en) * 1955-11-08 1958-02-25 Gen Motors Corp Degasser attachment for internal combustion engines
US2877998A (en) * 1956-06-29 1959-03-17 Holley Carburetor Co Apparatus for controlling the admission of fuel and air to an internal combustion engine
US2993485A (en) * 1959-01-12 1961-07-25 Holley Carburetor Co Intake manifold vacuum actuated fuel shut-off apparatus
US3503594A (en) * 1967-08-28 1970-03-31 Toyota Motor Co Ltd Fuel system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3847125A (en) * 1972-01-27 1974-11-12 A Malherbe Carburetor
US3866588A (en) * 1972-04-28 1975-02-18 Toyota Motor Co Ltd Device for supplying secondary air to a gas engine intake manifold
DE2553699A1 (de) * 1974-11-30 1976-08-12 Fuji Heavy Ind Ltd Verbrennungskraftmaschine fuer motorfahrzeuge
US4007237A (en) * 1975-04-19 1977-02-08 Toyota Jidosha Kogyo Kabushiki Kaisha Compensation apparatus for carburetor
US5591383A (en) * 1995-04-25 1997-01-07 Krup; William R. Carburetor and metering device therefor
US5843345A (en) * 1995-12-22 1998-12-01 Briggs & Stratton Corporation Pneumatic accelerator for low emission charge forming devices
US7398962B2 (en) 2005-07-11 2008-07-15 Patrick Cooper Quick jet change fuel float bowl
US20100176519A1 (en) * 2007-05-25 2010-07-15 Omarsson Kristjan Bjoern Carburettors
US8641015B2 (en) 2007-05-25 2014-02-04 Kristjan Björn Omarsson Carburettors
US8695951B2 (en) * 2007-05-25 2014-04-15 Kristjan Björn Omarsson Carburettors

Also Published As

Publication number Publication date
DE2105268A1 (de) 1971-11-04
FR2088608A5 (enrdf_load_stackoverflow) 1972-01-07
ES194197U (es) 1974-11-16
BR7101803D0 (pt) 1973-02-22
ES194197Y (es) 1975-03-01
SE358209B (enrdf_load_stackoverflow) 1973-07-23

Similar Documents

Publication Publication Date Title
US3706444A (en) Carburettor for motor vehicle
US2621911A (en) Carburetor
GB1417081A (en) Internal combustion engine exhaust gas recirculation system
GB1214071A (en) Improvements in or relating to carburation devices for internal combustion engines for automobile vehicles
US3987131A (en) Altitude correction device for a carburetor and carburetor incorporating the same
US3661367A (en) Carburetors for internal combustion engines
US4235828A (en) Fuel economizer employing improved turbulent mixing of fuel and air
US4359034A (en) Exhaust gas recirculation control system
CA1196238A (en) Air-fuel mixture intake construction for internal combustion engines
FR2355172A1 (fr) Dispositif de recyclage des gaz d'echappement
GB1498869A (en) Multi-cylinder internal combustion engine
GB1143300A (en) Improvements in or relating to carburetors
US4495112A (en) Variable venturi-type carburetor
GB2086485A (en) Ic engine mixture intake system
GB1066656A (en) Improvements in carburetors for internal combustion engines
GB1242288A (en) Carburetors for internal combustion engines
US4010723A (en) Exhaust gas cleaning apparatus for an internal combustion engine for a vehicle
US2512085A (en) Carburetor nozzle
US2209511A (en) Carburetor
US2807449A (en) Carburetor construction
GB1341424A (en) Carburetor
GB1020440A (en) Improvements in carburetting devices with float chamber for internal combustion engines
US2576475A (en) Internal-combustion engine carburetion system
GB1224610A (en) Improvements in/or relating to carburation devices for internal combustion engines
GB1300325A (en) Improvements in or relating to compound carburetters for internal combustion engines