EP0768460B1 - Carburettor for an endothermic engine - Google Patents

Carburettor for an endothermic engine Download PDF

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Publication number
EP0768460B1
EP0768460B1 EP96115975A EP96115975A EP0768460B1 EP 0768460 B1 EP0768460 B1 EP 0768460B1 EP 96115975 A EP96115975 A EP 96115975A EP 96115975 A EP96115975 A EP 96115975A EP 0768460 B1 EP0768460 B1 EP 0768460B1
Authority
EP
European Patent Office
Prior art keywords
carburettor
carburettor according
float chamber
fuel
connection pipe
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
EP96115975A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0768460A1 (en
Inventor
Roberto Busi
Alfredo Terzi
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.)
Marelli Europe SpA
Original Assignee
Magneti Marelli 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 Magneti Marelli SpA filed Critical Magneti Marelli SpA
Publication of EP0768460A1 publication Critical patent/EP0768460A1/en
Application granted granted Critical
Publication of EP0768460B1 publication Critical patent/EP0768460B1/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
    • F02M7/00—Carburettors with means for influencing, e.g. enriching or keeping constant, fuel/air ratio of charge under varying conditions
    • F02M7/06—Means for enriching charge on sudden air throttle opening, i.e. at acceleration, e.g. storage means in passage way system

Definitions

  • the present invention relates to a carburettor for an endothermic engine, according to the preamble of claim 1 (US-A- 4305368).
  • an endothermic engine functions if fed with a mixture composed of air drawn from the atmosphere outside the engine and of fuel, in turn drawn from a carburettor fed by a tank.
  • the two components of the mixture are mixed with one another inside an induction pipe shaped like a Venturi tube which is arranged downstream of the engine and ends with a valve for regulation of the flow of air having a throttle which can be actuated by means of the accelerator.
  • a pressure prevails which is all the lower, the more the throttle keeps the induction pipe itself open. Therefore, the drawing of fuel from the carburettor and the number of revolutions of the engine are all the greater, the more the induction pipe is open.
  • the head between the fuel contained inside the carburettor and the induction pipe is all the smaller, the more the depression inside the induction pipe is accentuated, and therefore the more the throttle valve is open.
  • some carburettors are provided with a supercharging pump which is activated to reduce the head mentioned for the purpose of providing, until the moment when the new operating conditions prevail, a fuel flow leaving the carburettor of a greater value than that otherwise provided for the one pressure difference.
  • the aim of the present invention is to produce a carburettor for an endothermic engine which makes it possible to vary rapidly the functioning conditions of the engine without the need to resort to the use of an additional pump and, therefore, is particularly simple and economical.
  • a carburettor for an endothermic engine comprising a float chamber arranged at the bottom and capable of containing fuel, an inlet for feeding fuel to said float chamber, and an outlet for feeding, by induction, fuel to outside the carburettor, said inlet and outlet being respectively engaged by a first and by a second essentially vertical pin, said first pin being integral with a vertically mobile body floating in the fuel contained in the float chamber, first actuating means arranged above said float chamber for moving axially said second pin, characterized in that it comprises a second body shaped in a determinate manner, and guide means constraining said second body to move vertically inside said float chamber, and second actuating means which are mobile in phase with said first actuating means being provided to control the movement of said second body inside the float chamber so as to cause determinate variations of the free surface of the fuel contained by the float chamber.
  • FIG 1 indicates as a whole a carburettor for an engine 1a (Figure 2) with controlled ignition which can be fed with liquid fuel 2.
  • the carburettor 1 comprises a float chamber 3 arranged at the bottom and capable of receiving the fuel 2 from a tank 4 through an essentially cylindrical inlet pipe 5 which is essentially vertical and is arranged on the side of the tank 4 in Figure 1.
  • the carburettor 1 is also provided with an outlet pipe 6 which receives fuel 2 from the float chamber 3 and feeds it to an essentially horizontal outlet mouth 8 which is arranged above, and at a determinate distance from the bottom of, the float chamber 3.
  • the carburettor 1 also comprises another pipe 9 for the fuel 2 made in the bottom of the float chamber 3 for connecting hydraulically the pipe 6 to a cylinder 10 which is open upwards and extends vertically from the bottom of the float chamber 3.
  • the carburettor 1 also comprises a group 11 for controlling the opening of the pipe 5 for dosing the flow of fuel 2 inside the float chamber 3 in a manner inversely proportional to the level of the fuel 2 contained inside the float chamber 3 itself, and a group 12 for control of the flow of fuel 2 leaving the carburettor 1 through the pipe 6.
  • the carburettor 1 also comprises two actuating devices 13 and 14 with cam and rocker arranged above the float chamber 3, and a group 16 for pumping of the volumetric type which is capable of pumping fuel 2 from the float chamber 3 to the pipe 6 through the pipe 9.
  • the device 13 and the device 14 can be actuated in phase, and the device 14 is capable of actuating the pumping group 16.
  • the group 11 comprises an internally hollow toroidal body 18 which is coupled externally to the pipe 6 in a freely sliding and angularly fixed manner and bears, in the region of an outlet mouth of the pipe 5 facing downwards, a cylindrical pin 20 having a cross-section, the diameter of which approximates to the nearest greater whole number the internal dimension of the pipe 5, and ends towards the top with a conical end portion 22 in such a manner that, at a determinate position of the level of the fuel 2 inside the float chamber 3, the inlet mouth of the pipe 5 has a passage port of determinate dimensions.
  • an increase in the port for passage of the fuel 2 corresponds to the falling of the level of fuel 2 inside the float chamber 3 so as to obtain rapidly the reestablishment of a determinate level of fuel 2 inside the float chamber 3.
  • control group 12 comprises a pin 24, the lateral surface of which has a slight conicity in such a manner that a passage port for the fuel 2 from the float chamber 3 of determinate width corresponds to a determinate axial position inside the pipe 6, and, in any case, the port falls with the lowering of the pin 24 itself.
  • the actuating device 13 comprises a pivot 26 which is orthogonal to the longitudinal axis of the pin 24 and on which a rocker 28 is fulcrumed.
  • the rocker 28 is connected to the pin 24 by means of the interposition of a rod 28a which is coaxial with the pin 24 and belongs to an elastic device 28b which is capable of rotating the rocker 28 in the anti-clockwise direction (Figure 1) to bring the pin 24 back into a respective rest position, to which a minimum flow of fuel 2 through the pipe 6 corresponds.
  • the rocker 28 is provided, in an essentially intermediate position between the pivot 26 and a portion 29, with a tappet roller 30 parallel to the pivot 26.
  • the rocker 28 is mobile with an oscillatory motion under the thrust of a cylindrical body 31 which is arranged below the rocker 28 and fulcrumed in the region of a spindle 32 parallel to the pivot 26 and is rotatable about the spindle 32 through an angle which approximates to the nearest smaller whole number 180°.
  • the body 31 is delimited laterally by a peripheral surface orthogonal to the pin 24, one lateral portion 33 of which (facing upwards in Figure 1) is shaped so as to define a cam 34, about which more will be said below.
  • the body 31 is rotatable about the spindle 32 under the thrust of a metal wire 31a and against the action of a known return spring (not illustrated).
  • the device 13 also comprises, in addition to the pivot 26, the rocker 28, the cam 34 and the roller 30.
  • the wire 31a is actuated together with a known pull rod (not illustrated) which actuates the throttle valve 32a of the carburettor 1 itself to increase the flow of air to a contracted section 32b of an induction pipe 32c of the engine 1a.
  • the pumping group 16 has a piston 35 which engages the sealed cylinder 10 and constitutes the lower part of a vertical rod 36 which passes, with its upper end 38, through a separating wall 40 capable of isolating an upper zone of the carburettor 1 containing the actuating devices 13 and 14 from a lower zone of the carburettor 1 itself. Therefore the cylinder 10 and the piston 35 define a guide device which keeps the rod 36 constantly vertical.
  • the pumping group 16 also comprises a chamber 42 defined by a lower face of the piston 35 and by the lateral walls and lower wall of the cylinder 10, and that the chamber 42 is fed by the fuel 2 during the travel upwards of the piston 35 through an induction hole 44 made in the pipe 9 in essentially intermediate position between the cylinder 10 and the pipe 6.
  • the rod 36 is provided, below the wall 40 and in a raised position in relation to an upper edge of the float chamber 3, with a cylindrical body 45 which is more clearly visible in Figure 3 having a longitudinal axis and two faces essentially transverse to the longitudinal axis itself.
  • the body 45 is integral with the rod 36, is therefore guided vertically by the cylinder 10 and by the piston 35 and its own function will be clarified further below.
  • pipe 9 ends on the side of the pipe 6 with a cylindrical portion 46 facing and open upwards which surrounds an inlet mouth 6a of the pipe 6 itself isolating an annular portion 48 which, in the case in question, is engaged by an annular "O ring” type seal 50, by means of which the pipes 6 and 9 are interconnected in a sealed manner.
  • the rod 36 ends above the wall 40 with an end piece 52, and the device 14 comprises a tappet roller 54 orthogonal to the rod 36 and supported by the end piece 52, and a rocker 55 integral with the cylindrical body 31 which, therefore, is mobile with an oscillatory motion about the spindle 32.
  • the roller 54 is freely rotatable about its own longitudinal axis and is tangent at the bottom to the body 31 in the region of a respective lateral portion 56 opposite the portion 33 and shaped so as to define a cam 58.
  • the rod 36 is pushed downwards by the cam 58 against the thrust of a spring 60a which is contained inside the body 10 between the bottom of the float chamber 3 and the face of the piston 35 facing downwards. Consequently, the rod 36 moves downwards causing the body 45 to be submerged in the fuel 2 contained in the float chamber 3. Therefore, the head of the fuel 2 in relation to the mouth 8 is reduced very rapidly by virtue of the principle of communicating vessels and by the thrust which the fuel 2 contained inside the chamber 42 and inside the pipe 9 receives from the piston 35.
  • the hole 42 and the seal 50 could be omitted so as to leave to the annular portion 48 the function of communication between the pipe 9 and the float chamber 3, carried out originally by the hole 44.
  • the seal 50 could be omitted leaving the hole 44.
  • the carburettor 61 differs from the carburettor 1 in the fact that it has no connection pipe 9 between the cylinder 10 and the pipe 6, therefore the cylinder 10 of the carburettor 61 is closed at the bottom and communicates with the float chamber 3 by means of a pipe 62 made inside the piston 35.

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)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
EP96115975A 1995-10-09 1996-10-04 Carburettor for an endothermic engine Expired - Lifetime EP0768460B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT95BO000477A IT1279647B1 (it) 1995-10-09 1995-10-09 Carburatore per un motore endotermico.
ITBO950477 1995-10-09

Publications (2)

Publication Number Publication Date
EP0768460A1 EP0768460A1 (en) 1997-04-16
EP0768460B1 true EP0768460B1 (en) 2001-01-17

Family

ID=11340846

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96115975A Expired - Lifetime EP0768460B1 (en) 1995-10-09 1996-10-04 Carburettor for an endothermic engine

Country Status (4)

Country Link
EP (1) EP0768460B1 (es)
DE (1) DE69611586T2 (es)
ES (1) ES2154770T3 (es)
IT (1) IT1279647B1 (es)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR617094A (fr) * 1925-06-06 1927-02-12 Solex Perfectionnements apportés aux carburateurs comportant un réservoir à niveau constant et un ou plusieurs gicleurs
US1803012A (en) * 1928-12-04 1931-04-28 Solex Carburetor
FR672250A (fr) * 1929-03-29 1929-12-24 Perfectionnement aux carburateurs
GB348179A (en) * 1930-02-07 1931-05-07 Ernest John Daniel Child Improvements in and relating to carburettors for internal combustion engines
US1872555A (en) * 1930-04-18 1932-08-16 Frederick O Ball Carburetor
DE697404C (de) * 1938-11-08 1940-10-14 Alwin Duesterloh Dipl Ing Spritzvergaser mit Schwimmerkammerregelung
AU511472B2 (en) * 1976-04-07 1980-08-21 General Motors Corporation Carburettor accelerator pump
US4305368A (en) * 1977-09-12 1981-12-15 Acf Industries, Inc. Apparatus for venting fuel vapors

Also Published As

Publication number Publication date
ITBO950477A1 (it) 1997-04-09
IT1279647B1 (it) 1997-12-16
DE69611586D1 (de) 2001-02-22
EP0768460A1 (en) 1997-04-16
DE69611586T2 (de) 2001-06-21
ITBO950477A0 (it) 1995-10-09
ES2154770T3 (es) 2001-04-16

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