EP0285077B1 - Carburateur pour moteurs à combustion interne - Google Patents

Carburateur pour moteurs à combustion interne Download PDF

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Publication number
EP0285077B1
EP0285077B1 EP88105003A EP88105003A EP0285077B1 EP 0285077 B1 EP0285077 B1 EP 0285077B1 EP 88105003 A EP88105003 A EP 88105003A EP 88105003 A EP88105003 A EP 88105003A EP 0285077 B1 EP0285077 B1 EP 0285077B1
Authority
EP
European Patent Office
Prior art keywords
valve
carburetor
disc
choke
flat plate
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
EP88105003A
Other languages
German (de)
English (en)
Other versions
EP0285077A1 (fr
Inventor
Pierluigi Dell'orto
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.)
Dell Orto SpA
Original Assignee
Dell Orto SpA
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 Dell Orto SpA filed Critical Dell Orto SpA
Priority to AT88105003T priority Critical patent/ATE95891T1/de
Publication of EP0285077A1 publication Critical patent/EP0285077A1/fr
Application granted granted Critical
Publication of EP0285077B1 publication Critical patent/EP0285077B1/fr
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
    • F02M9/00—Carburettors having air or fuel-air mixture passage throttling valves other than of butterfly type; Carburettors having fuel-air mixing chambers of variable shape or position
    • F02M9/02—Carburettors having air or fuel-air mixture passage throttling valves other than of butterfly type; Carburettors having fuel-air mixing chambers of variable shape or position having throttling valves, e.g. of piston shape, slidably arranged transversely to the passage
    • F02M9/06—Carburettors having air or fuel-air mixture passage throttling valves other than of butterfly type; Carburettors having fuel-air mixing chambers of variable shape or position having throttling valves, e.g. of piston shape, slidably arranged transversely to the passage with means for varying cross-sectional area of fuel spray nozzle dependent on throttle position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four

Definitions

  • the present invention concerns improvements in carburetors of the needle type with gate valve, for two-stroke or four-stroke internal combustion engines, especially for motorcycles.
  • the air sucked by the engine increases its own speed, particularly in the area underlying the valve, and this speed increase turns into a pressure fall which causes the inflow of fuel through said calibrated hole.
  • gate valves for this type of carburetors have essentially been cylindrical and flat.
  • the cylindrical valves provide the considerable advantages of an improved distribution of the force transmitted by the spring closing the valve (and, thus, of an improved adjustment of the gas metering by the driver), and of an easier working (with conventional methods) of the mixing chamber (area of intersection between the main duct of the carburetor and the valve guide) and of the valve seat; but also the serious drawback that, as the mixture starts to come out of the full power jet - when the valve is slightly open - it may easily hit against the lower rim of the cylindrical body forming the valve itself, thereby causing dripping, condensation and, consequently, difficult and bad atomization; this fault then shows up most seriously (lack of progression) just when the best carburetion is required from the engine, that is, during pickup and sudden acceleration, and it is all the more emphasized the larger the duct of the carburetor and the diameter of the cylindrical valve.
  • DE-A-2222104 (corresponding to the preamble of claim 1) tries to gather the advantages and to eliminate the disadvantages of the two above kind of carburetors, realizing the gate valve in form of a disc with cylindrical wall from which a flat plate is projected. Said disc is subjected to the pression of the closing spring, while said flat plate moves inside an inserted choke of the carburetor body.
  • this solution does not foresee any positive guide of the disc of the gate valve.
  • DE-A-3019065 teaches to guide the movements of a gate valve in a carburetor, but it is a conventional valve gate, completely different from the one of DE-A-2223104.
  • said flat plate is formed of a pair of interconnected flat walls, the cylindrical wall disc and the flat plate projecting therefrom can form a single piece obtained by casting, and the inserted choke is also formed by casting.
  • these members or parts thereof can be of suitable synthetic plastic material.
  • the carburetor body is indicated by 1, its main duct by 2, the constant level float chamber by 3, the idling jet by 4 and the full-power diffuser by 5.
  • the carburetor is equipped with a gate valve 6 onto which act, for its opening, a control cable 7 controlled by the accelerator and, for its closing, a helical spring 8; to the valve 6 there is fixedly connected a needle 9 which penetrates in known manner into the full-power diffuser 5.
  • Reference CM indicates the carburetor mixing chamber, formed by the inserted choke 10 applied centrally into the carburetor body 1.
  • the gate valve 6 of the carburetor comprises a disc 11 with cylindrical wall 12, onto which bears (as onto a conventional cylindrical valve) the spring 8, and which slides (like a conventional cylindrical valve) into a corresponding cylindrical seat 13 of the carburetor, perpendicular to the main duct 2.
  • a flat plate 14 projecting diametrically and perpendicularly from its disc 11. Furthermore, the end of the needle 9 connected to the valve 6 projects beyond said plate 14, centrally thereto.
  • the plate 14 is formed of two flat parallel walls 15 and 16, mutually connected by a central bridge 17 housing the needle 9, and fixedly connected to the disc 11.
  • the inserted choke 10 - formed separately, preferably by casting - is inserted at the centre of the carburetor body 1, with which it forms the mixing chamber CM. It comprises ports 18, forming the duct 2, and two pairs of guide slots 19, into which are inserted and tightly slide the two flat walls 15 and 16 forming the plate 14 of the valve 6.
  • the disc 11, the walls 15 and 16, and the bridge 17 of the plate 14 of the valve 6, are formed in one piece by casting of metallic material.
  • the valve 6 could be differently obtained and could suitably comprise at least some parts of synthetic plastic material.
  • Even the inserted choke 10 could be made from synthetic plastic material.
  • the wall 15 of the plate 14 of the gate valve 6 comprises a known type recess 20, on the air inlet side, for forming the mixture.
  • the carburetor according to the invention provides all the advantages of those with cylindrical valve and of those with flat valve, without having their defects.
  • the arrangement of the invention in fact combines an efficient bearing of the valve closing spring and an easy working of the valve seat, typical of carburetors with cylindrical valve, with a good atomization in each working step, which is typical of carburetors with flat valve; moreover, without having to resort to a complicated working or having to face problems connected with valve closing, it is possible to prevent dripping and condensation of the mixture on the valve itself.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Means For Warming Up And Starting Carburetors (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Claims (5)

  1. Carburateur pour moteur à combustion interne, d'un type dans lequel le conduit principal est intercepté, pour des raisons de réglage, par un robinet vanne soumis à l'action d'un ressort de fermeture en correspondance avec l'entrée du mélange dans ledit conduit et dans lequel un pointeau est associé à ladite vanne un pointeau pour régler le flux d'entrée du mélange; ledit robinet vanne est formé par un disque (11) avec une paroi cylindrique, soumis à la pression du ressort de fermeture (8) et par une plaque plane (15, 16) en saillie diamétralement et perpendiculairement audit disque, auquel il est relié de façon fixe; un volet d'admission à piège rapporté (10) est associé au corps du carburateur, ledit volet d'admission à piège (10) ayant des fentes parallèles à son axe dans lesquelles ladite plaque plane (15, 16) du robinet vanne est guidée et retenue pendant son déplacement, caractérisé en ce que le disque (11) avec la paroi cylindrique se déplacent sur un siège (13) de forme correspondante et est guidé avec précision sur ledit siège (13) pendant son déplacement; et en ce que le volet d'admission à piège rapporté (10) a une forme cylindrique externe et comprend un passage cylindrique traversant formant le conduit principal (2) du carburateur dans ledit volet d'admission à piège (10).
  2. Carburateur selon la revendication 1, dans lequel ladite plaque plane de la vanne est formée d'une paire (15, 16) de parois planes interconnectées.
  3. Carburateur selon la revendication 1, dans lequel le disque de la paroi cylindrique (11, 12) et la plaque plane (15, 16) de la vanne forment une seule pièce obtenue par moulage.
  4. Carburateur selon la revendication 1, selon laquelle ledit volet d'admission à piège (10) est formé par moulage.
  5. Carburateur selon les revendications 1 à 4 dans lequel ladite vanne (11, 15, 16) et ledit volet d'admission à piège rapporté (10) sont au moins partiellement formés dans une matière plastique synthétique.
EP88105003A 1987-04-02 1988-03-28 Carburateur pour moteurs à combustion interne Expired - Lifetime EP0285077B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88105003T ATE95891T1 (de) 1987-04-02 1988-03-28 Vergaser fuer brennkraftmaschinen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1994087 1987-04-02
IT19940/87A IT1203425B (it) 1987-04-02 1987-04-02 Carburatore per motori a combustione interna perfezionato

Publications (2)

Publication Number Publication Date
EP0285077A1 EP0285077A1 (fr) 1988-10-05
EP0285077B1 true EP0285077B1 (fr) 1993-10-13

Family

ID=11162511

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88105003A Expired - Lifetime EP0285077B1 (fr) 1987-04-02 1988-03-28 Carburateur pour moteurs à combustion interne

Country Status (5)

Country Link
EP (1) EP0285077B1 (fr)
AT (1) ATE95891T1 (fr)
DE (1) DE3884837T2 (fr)
ES (1) ES2044994T3 (fr)
IT (1) IT1203425B (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB280028A (en) * 1926-10-28 1927-11-10 Brown & Barlow Ltd Improvements in or relating to carburettors for internal combustion engines
FR950064A (fr) * 1947-07-24 1949-09-16 Weber Spa E Dispositif d'étranglement du mélange pour carburateur et carburateur muni du dispositif même
DE1238719B (de) * 1959-04-07 1967-04-13 J Gurtner Sa Des Ets Kolbenschiebervergaser
DE2222104C2 (de) * 1971-06-10 1982-09-23 Ford-Werke AG, 5000 Köln Vergaser für Ottomotoren
DE3019065A1 (de) * 1980-05-19 1981-11-26 William H. El Toro Calif. Edmonston Vergaser

Also Published As

Publication number Publication date
DE3884837T2 (de) 1994-02-10
ES2044994T3 (es) 1994-01-16
IT8719940A0 (it) 1987-04-02
EP0285077A1 (fr) 1988-10-05
IT1203425B (it) 1989-02-15
ATE95891T1 (de) 1993-10-15
DE3884837D1 (de) 1993-11-18

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