EP0113268B1 - Kaltstartautomatik für Vergaser - Google Patents

Kaltstartautomatik für Vergaser Download PDF

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Publication number
EP0113268B1
EP0113268B1 EP19830402348 EP83402348A EP0113268B1 EP 0113268 B1 EP0113268 B1 EP 0113268B1 EP 19830402348 EP19830402348 EP 19830402348 EP 83402348 A EP83402348 A EP 83402348A EP 0113268 B1 EP0113268 B1 EP 0113268B1
Authority
EP
European Patent Office
Prior art keywords
lever
rotary
rotary lever
arm
flap
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
EP19830402348
Other languages
English (en)
French (fr)
Other versions
EP0113268A1 (de
Inventor
André Nartowski
Jacques Picault
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.)
Regie Nationale des Usines Renault
Weber SRL
Original Assignee
Regie Nationale des Usines Renault
Weber SRL
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 Regie Nationale des Usines Renault, Weber SRL filed Critical Regie Nationale des Usines Renault
Publication of EP0113268A1 publication Critical patent/EP0113268A1/de
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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
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/08—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically
    • F02M1/10—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically dependent on engine temperature, e.g. having thermostat

Definitions

  • the present invention relates to carburetors of internal combustion engines and relates more particularly to an automatic choke device of the bimetal type fitted to a carburetor.
  • These carburetors generally have an eccentric flap in a suction pipe upstream of a gas butterfly. At low temperatures, this flap is biased in the direction of its closing by a bimetal spring commonly known as a bimetallic strip, connected to a first arm of a rotary lever mounted on a shaft and a second arm of which is engaged with a pull rod. '' a diaphragm box controlled by the pressure in the suction pipe.
  • a bimetal spring commonly known as a bimetallic strip
  • This choke system supplies the internal combustion engine with a more highly enriched mixture at cold start than during normal engine operation during which the diaphragm box controlled by the pressure prevailing in the suction pipe slightly opens the shutter. starting point closed by the bimetallic strip, after the engine has started.
  • the richness is suitable for a start at - 20 ° C for example, it turns out to be too low at + 15 ° C and the engine stalls after the start.
  • the invention aims to overcome this drawback by providing an automatic choke device for carburetors which always ensures a suitably enriched mixture.
  • the control arrangement of the flap and the throttle valve comprises a first rotary lever, one arm of which is linked to a bimetallic strip, which is connected by by means of a spring with a first arm of a second rotary lever articulated to a tie rod itself articulated to a control lever secured to the shutter shaft, the second arm of the second rotary lever being engaged with a pull rod of a diaphragm box controlled by the pressure prevailing in the suction pipe, on the one hand, as well as an adjustable stop positioned opposite the arm of the first rotary lever so as to limit the rotation of the latter in the direction of closing the flap, on the other hand.
  • This feature makes it easy to obtain, on the one hand, a torque of the starting flap which is no longer proportional to the temperature thanks to an adjustable locking in rotation of the first rotary lever and, on the other hand, a flap couple sought during of the development and therefore the richness of optimal mixture to start the engine.
  • the two rotary levers of the shutter control arrangement have respective arms provided with respective stops intended to cooperate with each other in the direction of opening of the shutter.
  • This feature allows the second rotary lever to be driven by the first rotary lever in the direction of opening the shutter.
  • the first rotary lever has a cam surface capable of opening a throttle valve via a control lever and a tie rod.
  • the carburetor on which the automatic choke device according to the present invention is mounted, comprises all the usual systems which ensure its complete operation; these systems not directly related to the invention have not been shown in the drawings.
  • the conventional automatic choke device is mounted on a body 1 of the carburetor; it includes an arrangement for controlling a starting flap 2 and a throttle valve not shown.
  • the shutter 2 located in the air inlet E of the carburetor 1 upstream of the spray not shown, can pivot around an eccentric axis A. It is linked by means of a control lever 3 and a tie rod 4 to a choke mechanism; this mechanism essentially comprises two rotary levers 6 and 8 mounted axially and respectively on two flats of a shaft 7.
  • the shaft 7 is articulated at one end of the tie rod 4.
  • the rotary lever 6 has three arms 61, 62 and 63.
  • a bimetallic strip 5 is fixed on the end of the arm 61.
  • the arm 62 is engaged with a traction rod 22 of a membrane box 16.
  • the arm 63 bears on the stop 10 of the cam 9 and is linked to
  • a gas butterfly not shown can be ajar by means of a control lever 12 pivoting around a shaft 13. This lever 12 bears at one end on the cam 9 and its other end is articulated to a tie rod 14 connected to a throttle shaft not shown.
  • a stop 15, housed inside the body 1 of the carburetor, is positioned so as to stop the starting flap 2 in a substantially vertical position.
  • the starting flap 2a housed in a carburetor body 1a, can pivot around an eccentric axis B.
  • This starting flap 2a is linked to a choke mechanism according to the invention by the 'through a control lever 3a and a tie rod 4a.
  • This choke mechanism consists essentially of a first rotary lever 9a, one arm 18 of which is linked to a bimetallic strip 5a.
  • This rotary lever 9a is connected via a spring 11a a to a first arm 20 of a second rotary lever 8a articulated to the tie rod 4a.
  • This second lever 8a has a second arm 6a which is engaged with a traction rod 22a of a membrane box 16a.
  • rotary levers 8a and 9a are mounted on the same shaft 7a.
  • the rotary lever 8a pivots freely on the shaft 7a and the rotary lever 9a has a cam surface 23 capable of opening a throttle valve not shown by means of a control lever 12a bearing on this surface by one of its ends and pivoting around a shaft 13a.
  • a tie rod 14a articulated at the other end of the lever 12a, is integral with a throttle shaft not shown.
  • a stop 15a housed inside the body 1a of the carburetor, is positioned so as to stop the starting flap 2a in a substantially vertical position.
  • the choke device according to the invention comprises an adjustable stop 17 positioned opposite the arm 18 of the first rotary lever 9a, and stops 19 and 21 intended to cooperate with each other and integral with the respective arms 18 and 20 of the two rotary levers 9a and 8a.
  • This flexible spring connection is necessary to allow tilting of the flap 2 after the engine has started despite the blocking of the cam 9 by the control lever 12.
  • the lever 12 connected to the throttle shaft not shown by the tie rod 14 , allows to open the throttle valve.
  • the bimetallic strip 5 When the bimetallic strip 5 is hot after the engine has started, it gives a torque C 'oriented in the opposite direction to that of a torque C corresponding to a cold bimetallic strip.
  • the levers 6 and 8 will lower the tie rod 4 and open the starting flap 2 until it is found against the stop 15 in a substantially vertical position.
  • the cam 9 is no longer in contact at this time with the control lever 12 and the throttle valve is in the hot idle position.
  • the automatic choke device operates as follows:
  • the constituent elements of the choke occupy a position shown in FIG. 2.
  • the bimetallic strip 5a exerts a torque on the first rotary lever 9a along the arrow C.
  • This lever 9a pulls the second rotary lever 8a via of the spring 11 a, which causes the closing of the starting flap 2a via the tie rod 4a and the control lever 3a.
  • the bimetallic strip 5a turns the first rotary lever 9a in a limited way because, at a given angle of rotation, this lever 9a comes into contact with the adjustable stop 17.
  • This stop 17 is judiciously positioned so that the given angle of rotation corresponds to a specific bimetallic pair at a chosen temperature.
  • Curve 1 represents a curve for variation of the shutter torque for a conventional automatic choke device as a function of the temperature and with a given bimetallic strip.
  • Curve 2 represents a variation curve of the flap torque for an automatic choke device according to the invention as a function of the temperature, with the bimetallic strip which gives curve 1 and the stop 17 set at 0 ° C; the rotation of the first rotary lever 9a is stopped as soon as the temperature of the bimetallic strip 5a reaches 0 ° C.
  • Curve 3 represents the flap torque given by a bimetallic strip 5a, the torque of which increases faster than that of the bimetallic strip relating to curve 1, with a stop 17 preventing the rotation of the first rotary lever 9a at + 10 ° C.
  • Curve 4 represents the flap torque given by the same bimetallic strip corresponding to curve 1 but with an initial setting at + 25 ° C instead of + 20 ° C and a stop 17 set at + 7.5 ° C.
  • Curve 1 which is substantially a straight line, has been replaced by curves 2, 3 and 4 which each represent two straight line segments whose point of intersection corresponds to a maximum flap couple and at a temperature chosen for a given bimetallic strip .

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)

Claims (3)

1. Kaltstartautomatik für Vergaser mit einer Steueranordnung für eine Klappe (2a) und eine im Vergasergehäuse (1a) angeordnete Drosselklappe, die im wesentlichen an einer Welle (7a) drehbar angeordnete Hebel (8a, 9a), ein wärmeempfindliches Teil in Form eines Bimetallstreifens (5a), ein Membrangehäuse (16a), das von dem im Ansaugstutzen herrschenden Druck gesteuert wird und eine Zugstange (4a) aufweist, die an einem Ende eines Steuerhebels (3a) angelenkt ist, der mit der Welle (8) der Klappe (2a) fest verbunden ist, dadurch gekennzeichnet, daß der erste drehbare Hebel (9a), der über einen Arm (18) mit dem Bimetallstreifen (5a) verbunden ist, über eine Feder (1 la) mit einem ersten Arm (20) des zweiten drehbaren Hebels (8a) verbunden ist, der am anderen Ende der Zugstange (4a) angelenkt ist, während der zweite Arm (6a) des zweiten drehbaren Hebels (8a) in eine Zugstange (22a) des Membrangehäuses (16a) eingreift und daß ein regelbarer Anschlag (17) vorgesehen ist, der gegenüber dem Arm (18) des ersten drehbaren Hebels (9a) derart angeordnet ist, daß er die Drehung des letzteren in Richtung des Schließens der Klappe (2a) begrenzt.
2. Kaltstartautomatik nach Anspruch 1, dadurch gekennzeichnet, daß die entsprechenden Arme (18 und 20) der beiden drehbaren Hebel (9a und 8a) mit entsprechenden Anschlägen (19 und 21) versehen sind, die dazu dienen, in Richtung des Öffnens der Klappe (2a) zusammenzuwirken.
Kaltstartautomatik nach Ansprüchen 1 oder 2, dadurch gekennzeichnet, daß der erste drehbare Hebel (9a) eine Nockenfläche (23) aufweist, die in der Lage ist eine Drosselklappe mittels eines Steuerhebels (12a) und einer Zugstange (14a) halb zu öffnen.
EP19830402348 1982-12-07 1983-12-06 Kaltstartautomatik für Vergaser Expired EP0113268B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8220455A FR2537212A1 (fr) 1982-12-07 1982-12-07 Dispositif de starter automatique pour carburateurs
FR8220455 1982-12-07

Publications (2)

Publication Number Publication Date
EP0113268A1 EP0113268A1 (de) 1984-07-11
EP0113268B1 true EP0113268B1 (de) 1986-11-26

Family

ID=9279850

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830402348 Expired EP0113268B1 (de) 1982-12-07 1983-12-06 Kaltstartautomatik für Vergaser

Country Status (4)

Country Link
EP (1) EP0113268B1 (de)
DE (1) DE3367957D1 (de)
ES (1) ES8406638A1 (de)
FR (1) FR2537212A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1219300B (it) * 1988-05-13 1990-05-03 Weber Srl Procedimento per la costruzione di un collettore per il carburante per un impianto di alimentazione del carburante di un motore a combustione interna
US7628387B1 (en) 2008-07-03 2009-12-08 Briggs And Stratton Corporation Engine air/fuel mixing apparatus
CN104215744A (zh) * 2014-09-23 2014-12-17 山东省分析测试中心 基于城市公交网的大气监测系统及方法
CN107687378B (zh) * 2016-08-03 2021-03-09 华益机电有限公司 一种通用汽油机燃油供给系统

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2285523A1 (fr) * 1974-09-23 1976-04-16 Peugeot & Renault Dispositif de starter automatique de carburateur
DE2446403A1 (de) * 1974-09-28 1976-04-08 Daimler Benz Ag Einrichtung zur drehzahlstabilisierung im leerlauf nach dem starten bei einem vergaser fuer ottomotoren
GB1488452A (en) * 1975-06-03 1977-10-12 Honda Motor Co Ltd Automatic choke valve apparatus for an internal combustion engine
DE2928092C2 (de) * 1979-07-12 1982-04-08 Pierburg Gmbh & Co Kg, 4040 Neuss Vergaser mit Kaltstarteinrichtung
FR2493921A1 (fr) * 1980-11-07 1982-05-14 Renault Dispositif de starter automatique pour carburateur double corps

Also Published As

Publication number Publication date
EP0113268A1 (de) 1984-07-11
ES527831A0 (es) 1984-08-01
FR2537212B1 (de) 1985-04-12
ES8406638A1 (es) 1984-08-01
DE3367957D1 (en) 1987-01-15
FR2537212A1 (fr) 1984-06-08

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