US3608874A - Carburetor for internal combustion engines - Google Patents

Carburetor for internal combustion engines Download PDF

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Publication number
US3608874A
US3608874A US803273*A US3608874DA US3608874A US 3608874 A US3608874 A US 3608874A US 3608874D A US3608874D A US 3608874DA US 3608874 A US3608874 A US 3608874A
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US
United States
Prior art keywords
channel
carburetor
outlet opening
adjusting screw
mixture
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
US803273*A
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English (en)
Inventor
Rudolf Beckmann
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
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
Priority claimed from DE19681601994 external-priority patent/DE1601994A1/de
Application filed by Volkswagen AG filed Critical Volkswagen AG
Application granted granted Critical
Publication of US3608874A publication Critical patent/US3608874A/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
    • F02M3/00—Idling devices for carburettors
    • F02M3/08—Other details of idling devices
    • F02M3/12—Passageway systems
    • 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
    • Y10S261/38—Needle valves

Definitions

  • This invention relates to a carburetor for internal combustion engines having a flap valve with a bypass channel. It should be possible for control of the air flow that the proportional characteristics shall remain unchanged so that the ratio as to the mixture shall also be adjustable. It is therefore an object of the invention to provide a bypass channel in the carburetor so that the operative cross section of the bypass channel can be changed as well as the operative entry opening for the channel.
  • FIG. 1 is a longitudinal section of the carburetor or fuel injector
  • FIG. la is a sectional view of a modified detail of the mixture-entry bore
  • FIG. 2 is a longitudinal section of a modified carburetor.
  • the circulation or bypass channel 1 passes around the throt tle flap or valve 2.
  • the streaming technically operating cross section of the flow can be changed or adjusted by a setting or adjusting screw 3.
  • a regulating screw 4 is guided therein which cooperates with a connecting bore 5 to more or less free the connecting bore as to the bypass channel 1.
  • the regulating screw 4 can be adjusted so that the composition or combination at the mouth 6 will be changed as to the fuel-air mixture.
  • the mixture proportion or relation can be adjusted so that the mixture proportions (relative to air) can be maintained, since the outlet opening of the mixing bore 5 is in the bypass channel 1 and thereby the amount of fuel can be adjusted in the same proportions as the amount of air'.
  • the bypass channel 1 upon the complete closing of the valve 2, will deliver the entire running load mixture.
  • the throttle flap 2 can be adjusted to also permit a constant air-through flow and a constant or fixed mixture relationship. in this case, a mixture outlet opening 7 must be additionally provided, FIG. la. The smaller mixture for the mixture-outlet bore 7 must now be additionally provided over the bypass channel 1. The necessary mixture proportion will also be adjusted by means of the regulating screw 4.
  • the throttle flap valve is set in accordance with constant air-through flow-setting or composition.
  • the setting screw 3 and regulating screw 4 are together provided in a part 3' and this permits only a change in the amount of the mixture; not however a proportional mixture.
  • the mixture relationship is adjusted by means of the regulating screw 8 which in its cross section will change the outlet-mixture bore 7.
  • a carburetor comprising a housing including a main induction conduit having a throttle valve therein, an air bypass channel bridging around said throttle valve, an idling fuel passage in said housing and having an outlet opening in said bypass channel, and an adjustable regulating device projecting into said channel as well as into said outlet opening and operable to simultaneously change the flow cross sections of said channel and said outlet opening in a manner whereby the quantity of idling fuel-air mixture supplied to the engine may be varied without changing the mixing ratio of such mixture.
  • a carburetor according to claim 1 in which the regulating device is provided with an outside adjusting screw projecting into the channel and an inside adjusting screw guided in a thread in the outside adjusting screw and protruding into the outlet opening of the fuel passage and adjustable in order to change the mixing ratio independently of the outside adjusting screw.

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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)
US803273*A 1968-03-01 1969-02-28 Carburetor for internal combustion engines Expired - Lifetime US3608874A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681601994 DE1601994A1 (de) 1968-03-01 1968-03-01 Vergaser-Brennkraftmaschine mit einem die Drosselklappe umgehenden Umluftkanal

Publications (1)

Publication Number Publication Date
US3608874A true US3608874A (en) 1971-09-28

Family

ID=5680992

Family Applications (1)

Application Number Title Priority Date Filing Date
US803273*A Expired - Lifetime US3608874A (en) 1968-03-01 1969-02-28 Carburetor for internal combustion engines

Country Status (2)

Country Link
US (1) US3608874A (enrdf_load_stackoverflow)
FR (1) FR1599537A (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878271A (en) * 1972-05-17 1975-04-15 Alfa Romeo Spa Device for feeding the air-fuel mixture to an internal combustion engine during idling
US3931372A (en) * 1973-11-21 1976-01-06 Societe Industrielle De Brevets Et D'etudes S.I.B.E. Carburettors for internal combustion engines
US3942493A (en) * 1972-09-22 1976-03-09 Robert Bosch Gmbh Fuel metering system
US4007237A (en) * 1975-04-19 1977-02-08 Toyota Jidosha Kogyo Kabushiki Kaisha Compensation apparatus for carburetor
DE2855683A1 (de) * 1978-12-22 1980-06-26 Pierburg Gmbh & Co Kg Vergaser fuer brennkraftmaschinen
US4285887A (en) * 1979-01-29 1981-08-25 Honda Giken Kogyo Kabushiki Kaisha Carburetor
US4438049A (en) 1982-09-07 1984-03-20 Ford Motor Company Carburetor engine idle speed air bypass
US4578228A (en) * 1983-11-03 1986-03-25 Andreas Stihl Carburetor for an internal combustion engine
US4931226A (en) * 1989-03-01 1990-06-05 Shinagawa Diecasting Co., Ltd. Charge forming apparatus
US5002705A (en) * 1989-01-20 1991-03-26 Walbro Gmbh Carburetor including an idling adjustment system
US20030168753A1 (en) * 2002-03-08 2003-09-11 Takashi Abei Carburetor with idle fuel supply arrangement

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2970822A (en) * 1957-06-13 1961-02-07 Bernard Kriegel Carburetor idle system control apparatus
US3201097A (en) * 1961-11-20 1965-08-17 Walbro Corp Carburetor fuel system
US3319944A (en) * 1964-10-30 1967-05-16 Exxon Research Engineering Co Carburetor icing-eliminating structure
US3363886A (en) * 1966-05-17 1968-01-16 Walker Brooks Carburetor
US3374991A (en) * 1965-03-12 1968-03-26 Walker Brooks Carburetor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2970822A (en) * 1957-06-13 1961-02-07 Bernard Kriegel Carburetor idle system control apparatus
US3201097A (en) * 1961-11-20 1965-08-17 Walbro Corp Carburetor fuel system
US3319944A (en) * 1964-10-30 1967-05-16 Exxon Research Engineering Co Carburetor icing-eliminating structure
US3374991A (en) * 1965-03-12 1968-03-26 Walker Brooks Carburetor
US3363886A (en) * 1966-05-17 1968-01-16 Walker Brooks Carburetor

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878271A (en) * 1972-05-17 1975-04-15 Alfa Romeo Spa Device for feeding the air-fuel mixture to an internal combustion engine during idling
US3942493A (en) * 1972-09-22 1976-03-09 Robert Bosch Gmbh Fuel metering system
US3931372A (en) * 1973-11-21 1976-01-06 Societe Industrielle De Brevets Et D'etudes S.I.B.E. Carburettors for internal combustion engines
US4007237A (en) * 1975-04-19 1977-02-08 Toyota Jidosha Kogyo Kabushiki Kaisha Compensation apparatus for carburetor
DE2855683A1 (de) * 1978-12-22 1980-06-26 Pierburg Gmbh & Co Kg Vergaser fuer brennkraftmaschinen
US4283354A (en) * 1978-12-22 1981-08-11 Pierburg Gmbh & Co. Kg Carburetor for internal-combustion engines
US4285887A (en) * 1979-01-29 1981-08-25 Honda Giken Kogyo Kabushiki Kaisha Carburetor
US4438049A (en) 1982-09-07 1984-03-20 Ford Motor Company Carburetor engine idle speed air bypass
US4578228A (en) * 1983-11-03 1986-03-25 Andreas Stihl Carburetor for an internal combustion engine
US5002705A (en) * 1989-01-20 1991-03-26 Walbro Gmbh Carburetor including an idling adjustment system
US4931226A (en) * 1989-03-01 1990-06-05 Shinagawa Diecasting Co., Ltd. Charge forming apparatus
US20030168753A1 (en) * 2002-03-08 2003-09-11 Takashi Abei Carburetor with idle fuel supply arrangement
EP1342906A3 (en) * 2002-03-08 2003-12-10 Walbro Japan, Inc. Carburetor with idle fuel supply arrangement
US6871843B2 (en) 2002-03-08 2005-03-29 Walbro Japan, Inc. Carburetor with idle fuel supply arrangement

Also Published As

Publication number Publication date
FR1599537A (enrdf_load_stackoverflow) 1970-07-15

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