EP0193264B1 - Ensemble d'admission de carburant pour carburateur - Google Patents

Ensemble d'admission de carburant pour carburateur Download PDF

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Publication number
EP0193264B1
EP0193264B1 EP19860300356 EP86300356A EP0193264B1 EP 0193264 B1 EP0193264 B1 EP 0193264B1 EP 19860300356 EP19860300356 EP 19860300356 EP 86300356 A EP86300356 A EP 86300356A EP 0193264 B1 EP0193264 B1 EP 0193264B1
Authority
EP
European Patent Office
Prior art keywords
fuel
fitting
inlet
carburetor
disposed
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
Application number
EP19860300356
Other languages
German (de)
English (en)
Other versions
EP0193264A3 (en
EP0193264A2 (fr
Inventor
John Ross Lebold
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.)
Vernay Laboratories Inc
Original Assignee
Vernay Laboratories Inc
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 Vernay Laboratories Inc filed Critical Vernay Laboratories Inc
Publication of EP0193264A2 publication Critical patent/EP0193264A2/fr
Publication of EP0193264A3 publication Critical patent/EP0193264A3/en
Application granted granted Critical
Publication of EP0193264B1 publication Critical patent/EP0193264B1/fr
Expired 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0017—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor related to fuel pipes or their connections, e.g. joints or sealings
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • 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
    • F02M5/12—Other details, e.g. floats, valves, setting devices or tools
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators

Definitions

  • the present invention relates generally to a fuel supply system and carburetor for a motor vehicle, and more particularly, to the needle valve assembly typically used within the carburetor at the fuel inlet port.
  • a basic fuel supply system for a motor vehicle includes a fuel tank, and a fuel pump which carries fuel along a fuel line through the pump and directs the fuel into a carburetor. There, it is mixed with air for subsequent combustion within the engine.
  • One variation on this design includes a fuel return line extending from the fuel pump outlet back to the tank.
  • a check valve is provided within this line near the tank to prevent unwanted flow of fuel from the tank toward the carburetor or out of the fuel tank in the event of an accident.
  • a system of this kind is disclosed in U.S. Patent 4 173 958.
  • a needle valve is disposed for cooperation with the fuel float assembly inside the carburetor.
  • the valve is disposed within a seat and is normally pushed to an open position by the flow of flow into the carburetor.
  • the rear of the needle valve is in contact with a pivotally mounted float assembly, so that as the float chamber fills with fuel, the needle valve is pushed back into the seat, thereby reducing fuel flow.
  • this problem is solved by improving a motor vehicle fuel system having a tank, a fuel pump, and a carburetor including a fuel inlet.
  • a first fuel line connects the pump inlet and the tank, while a second fuel line connects the pump outlet and the carburetor fuel inlet.
  • a third fuel line connects the pump outlet with the tank.
  • a first check valve is disposed within the third fuel line near the tank for preventing flow from the tank into the third fuel line.
  • the carburetor further includes a needle valve located within the fuel inlet.
  • the improvement provided by the present invention includes a second check valve disposed within the carburetor fuel inlet for preventing flow from the vicinity of the needle valve toward the fuel pump and the tank.
  • the carburetor may include a float chamber, a float assembly, and a means defining a needle valve seat within the carburetor fuel inlet for containing the needle valve.
  • the needle valve itself then cooperates with the float assembly to regulate the flow of the fuel into the float chamber.
  • the check valve may be constructed as a single piece from a resilient material and includes a pair of lips arranged in a converging relationship to define for the valve an open end and a normally closed. End at the closed end, the lips are disposed adjacent each other to define a normally closed slit, and at least one side wall connects the lips.
  • An annular flange is directed outwardly about the open end of the valve member. The valve member is disposed with its closed end directed toward the needle valve, and is clamped by its flange for retaining the valve within the fuel inlet.
  • the fuel inlet assembly embodying the present invention possesses the advantage that it avoids intermittent sticking of the carburetor needle valve within its seat, thereby facilitating starting of the engine.
  • the improved inlet assembly has no effect upon the normal operation of the carburetor.
  • the improved inlet assembly can be added to an existing carburetor on a retrofit basis, and with relatively little expense.
  • float chamber 10 of a carburetor for an engine for a motor vehicle is shown schematically.
  • a float assembly 12 including at least one float 14 mounted to an arm 16 which is connected to a float assembly lever 18.
  • Float assembly 12 is pivotally mounted to a shaft 20.
  • Fitting 22 Threadingly engaged through the side wall of float chamber 10 is a fuel inlet fitting 22.
  • Fitting 22 includes an internal open end 24 into which is placed a needle valve 26 having a forward, conical tip 28 and a rearward end 30.
  • the interior of fitting 22 narrows so to define a valve seat 32 for needle valve 26.
  • An outer open end 34 is provided for fitting 22, with threads extending along a portion of the interior of fitting 22.
  • a fuel line 36 is secured by clamp 37 to a line fitting 38, which in turn is threadingly connected to outer end 34. Fuel may then be directed through line 36, through fitting 22 past needle valve 26, and into float chamber 10. Gaskets 39 may be provided to ensure a fluid- tight seal for the fuel flow path.
  • a fuel system is shown in which fuel is stored in a fuel tank 40.
  • a fuel line 42 directs fuel from tank 40 to fuel pump 44, from which fuel is directed along line 36 to carburetor 48.
  • a fuel filter 46 is disposed within line 36.
  • An excess fuel return line 50 connects the pump with tank 40.
  • a check valve 52 is provided within return line 50 at or near its entry into tank 40.
  • Check valve 52 is provided so that in the event of an accident in which the vehicle is overturned, fuel will not be able to flow from tank 40 through return line 50 to carburetor 48, where the fuel could spill creating the potential for fire or explosion. Since a typical fuel pump 44 will include internal valving that closes the fuel path when the pump is not operating, fuel would not flow through line 42 to line 36.
  • pump 44 directs fuel from tank 40 to carburetor 48.
  • the fuel pressure generated by the fuel pump moves needle valve 26 rearwardly so that fuel can enter flow chamber 10 through flow passages 53.
  • Fuel may enter chamber 10 more rapidly than the engine can accept the fuel, so that chamber 10 may fill with fuel.
  • the fuel Upon reaching a sufficient level within the chamber 10, the fuel will raise float 14, pivoting float assembly 12 about shaft 20, and causing lever 18 to move needle valve 26 back into its seat 32. This prevents the flow of fuel into chamber 10.
  • fuel can no longer flow through line 36, and must be directed through line 50 back to fuel tank 40.
  • the present invention provides a check valve 54 disposed between line fitting 38 and needle valve 26.
  • the function of check valve 54 is to prevent fuel from being drawn away from needle valve 26 and its seat 32. Accordingly, check valve 54 is positioned to permit flow towards carburetor 48, but to prevent its backward flow. Hence, despite the evacuation of fuel from line 46, the region around needle valve seat 32 retains fuel and is protected from any resulting vacuum.
  • check valve 54 is preferably of the duckbill type, and is formed as a single piece from a resilient material.
  • the valve 54 includes a pair of lips 56 arranged in a converging relationship to define a normally closed end for the valve 54 where lips 56 are disposed adjacent each other to define a normally closed slit 58.
  • a cylindrical side wall 60 connects the lips 56.
  • an annular flange 62 extends outwardly about the open end of the valve 54.
  • Check valve 54 is formed of an appropriate size so as to be placeable within inlet fitting 22 as shown in Fig. 1. Cylindrical side wall 60 and lips 56 fit within the narrow portion of fitting 22, with flange 62 disposed so that valve member 54 can be secured in place by attachment of fuel line fitting 38. (See also Fig. 3). This directs lips 56 toward needle valve 26 to provide the appropriate valving action.
  • the fuel filter mounts directly into the fuel inlet fitting 22. It will, of course, be recognised that in such a case, the filter may be used to secure valve 54 into place in a manner identical to that with fuel line fitting 38.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Check Valves (AREA)
  • Controls For Constant Speed Travelling (AREA)

Claims (6)

1. Système de carburation pour véhicule à moteur ayant un réservoir (40), une pompe de carburant (44), comportant une entrée de pompe et une sortie de pompe, un carburateur (48) comportant une entrée de carburant, une première conduite de carburant (42) connectant ladite entrée de pompe et ledit réservoir, une seconde conduite de carburant (36) connectant ladite sortie de pompe et ladite entrée de carburant du carburateur, et une troisième conduite de carburant (50) connectant ladite sortie de pompe et ledit réservoir, un premier clapet anti retour (52) disposé dans ladite troisième conduite de carburant près dudit réservoir pour empêcher l'écoulement depuis ledit réservoir dans ladite troisième conduite de carburant, ledit carburateur comportant en outre une soupape à pointeau (26) disposée dans ladite entrée de carburant, caractérisé par un second clapet anti retour (54) disposé dans ladite entrée de carburant du carburateur pour empêcher l'écoulement depuis le voisinage de ladite soupape à pointeau vers ladite pompe de carburant et ledit réservoir.
2. Système de carburation pour véhicule à moteur selon la revendication 1, dans lequel:
ledit second clapet anti retour (54) comporte un organe de soupape qui est construit en une seule pièce en un matériau élastique; et
ledit organe de soupape comporte une paire de lèvres (56) arrangées de façon convergente pour définir pour ledit organe de soupape, une extrémité ouverte et une extrémité normalement fermée tandis que lesdites lèvres sont disposées adjacentes l'une à l'autre pour définir entre elles une fente (58) normalement fermée, au moins une paroi latérale (60) pour connecter lesdites lèvres, et une collerette annulaire (62) dirigée vers l'extérieur autour de l'extrémité ouverte dudit organe de soupape.
3. Système de carburation pour véhicule à moteur selon une des revendications 1 ou 2, dans lequel:
ladite entrée de carburant comporte un raccord d'entrée (22) monté dans ledit carburateur (48), ledit raccord d'entrée définissant un siège (32) pour ladite soupape à pointeau;
ledit système de carburation comporte un raccord (38) de conduite de carburant fixé à ladite seconde conduite de carburant (36) et connecté audit raccord d'entrée; et
ledit second clapet anit retour (54) est disposé dans ledit raccord d'entrée et y est fixé par connexion audit raccord d'entrée dudit raccord de conduit de carburant.
4. Système de carburation pour véhicule à moteur selon la revendication 3, dans lequel:
ledit raccord d'entrée (22) comporte une partie extérieure d'extrémité (34), dont la surface intérieure comporte des moyens pour y fixer ledit raccord de conduite de carburant, une section centrale relativement étroite, et une région de jonction entre ladite partie extérieure d'extrémité et ladite section centrale;
ledit organe de soupape est disposé dans ledit raccord d'entrée par placement desdites lèvres (56) et de ladite paroi latérale dans ladite section centrale dudit raccord, avec ladite collerette posi- tionée adjacente à ladite région de jonction;
ledit organe de soupape étant fixé par connexion dudit raccord de conduite de carburant audit raccord d'entrée par lesdits moyens de fixation, tandis que ladite collerette est maintenue entre ledit raccord de conduite de carburant et ladite région de jonction.
5. Système de carburation pour véhicule à moteur selon une des revendications 1 ou 2, dans lequel:
ladite entrée de carburant comporte un raccord d'entrée (22) monté dans ledit carburateur (48), ledit raccord définissant un siège (32) pour ladite soupape à pointeau;
ledit système de carburation comporte un filtre de carburant disposé dans ladite seconde conduite de carburant (36) et connecté audit raccord; et
ledit second clapet anti retour (54) est disposé dans ledit raccord et y est fixé par connexion audit raccord dudit filtre à carburant.
6. Système de carburation pour véhicule à moteur selon la revendication 1, dans lequel:
ledit raccord (22) comporte une partie extérieure d'extrémité (34), dont la surface intérieure comporte des moyens pour y fixer ledit filtre de carburant, une section centrale relativement étroite et une région de jonction entre ladite partie extérieure d'extrémité et ladite section centrale;
ledit organe de soupape est disposé dans ledit raccord par placement desdites lèvres (56) et de ladite paroi latérale dans ladite section centrale dudit raccord, avec ladite collerette positionnée adjacente à ladite région de jonction; et
ledit organe de soupape étant fixé par connexion dudit filtre de carburant audit raccord par lesdits moyens de fixation, tandis que ladite collerette est maintenue entre ledit filtre de carburant et ladite région de jonction.
EP19860300356 1985-02-28 1986-01-20 Ensemble d'admission de carburant pour carburateur Expired EP0193264B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US70658585A 1985-02-28 1985-02-28
US706585 2003-11-12

Publications (3)

Publication Number Publication Date
EP0193264A2 EP0193264A2 (fr) 1986-09-03
EP0193264A3 EP0193264A3 (en) 1987-02-04
EP0193264B1 true EP0193264B1 (fr) 1990-05-23

Family

ID=24838232

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860300356 Expired EP0193264B1 (fr) 1985-02-28 1986-01-20 Ensemble d'admission de carburant pour carburateur

Country Status (3)

Country Link
EP (1) EP0193264B1 (fr)
JP (1) JPS61205370A (fr)
DE (1) DE3671501D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4997555A (en) * 1985-05-14 1991-03-05 Parker Hannifin Corporation Fuel filter assembly with heater
CA1312018C (fr) * 1987-03-30 1992-12-29 John F. Church Ensemble filtre a carburant et dispositif chauffage
US5772928A (en) * 1996-06-14 1998-06-30 Holtzman; Barry L. Needle and seat valve assembly

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR837163A (fr) * 1938-04-26 1939-02-03 Procédé et carburateurs pour l'alimentation d'un moteur à explosions
JPS53134112A (en) * 1977-04-22 1978-11-22 Toyota Motor Corp Carburetor
JPS5666437A (en) * 1979-11-06 1981-06-04 Nissan Motor Co Ltd Restart valve device
US4392507A (en) * 1981-05-15 1983-07-12 Stant Inc. Two-stage pressure relief valve

Also Published As

Publication number Publication date
EP0193264A3 (en) 1987-02-04
JPS61205370A (ja) 1986-09-11
EP0193264A2 (fr) 1986-09-03
JPH0580589B2 (fr) 1993-11-09
DE3671501D1 (de) 1990-06-28

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