EP0059654A1 - Vergaser für eine Brennkraftmaschine mit innerer Verbrennung - Google Patents

Vergaser für eine Brennkraftmaschine mit innerer Verbrennung Download PDF

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Publication number
EP0059654A1
EP0059654A1 EP82400226A EP82400226A EP0059654A1 EP 0059654 A1 EP0059654 A1 EP 0059654A1 EP 82400226 A EP82400226 A EP 82400226A EP 82400226 A EP82400226 A EP 82400226A EP 0059654 A1 EP0059654 A1 EP 0059654A1
Authority
EP
European Patent Office
Prior art keywords
cam
flap
open position
carburetor
shutter
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.)
Granted
Application number
EP82400226A
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English (en)
French (fr)
Other versions
EP0059654B1 (de
Inventor
André Nartowski
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.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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 Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of EP0059654A1 publication Critical patent/EP0059654A1/de
Application granted granted Critical
Publication of EP0059654B1 publication Critical patent/EP0059654B1/de
Expired legal-status Critical Current

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    • 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
    • F02M1/02—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling being chokes for enriching fuel-air mixture
    • 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
    • F02M1/14—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 pressure in combustion-air- or fuel-air-mixture intake

Definitions

  • the present invention relates to a starting flap carburetor for an internal combustion engine.
  • the "choke" allowing the cold start of the engine is constituted by a mechanism comprising a starting flap rotatably mounted in the body of the carburetor upstream of the fueling device.
  • the air shutter closes completely and closes the carburetor body.
  • a membrane capsule connected to the intake manifold opens the air flap thanks to the vacuum then prevailing in the intake manifold due to the very low degree of opening of the throttle valve.
  • the choke is partially pushed back for cold operation. This has the effect of placing the air shutter in an intermediate ajar position between its closed position and its fully open position.
  • the total or partial closing of the air shutter has the effect of enriching the air-gasoline mixture supplied to the engine, this enrichment being all the more important the more the air shutter is closed.
  • French Patent 2,393,161 describes a carburetor which contributes to providing a solution to this problem.
  • This carburetor is of the type comprising at least one body provided with a fuel spraying device, an air shutter mounted to rotate in the body upstream of the spraying device, a throttle valve for controlling the load of the engine mounted to rotate in the body downstream of the spraying device, elastic means urging the air shutter towards its fully closed position, a device for actuating the vacuum-sensitive shutter prevailing at the intake manifold, a linkage link between the device sensitive to depression and the air shutter comprising at least one articulation, said actuation device sensitive to depression and said linkage being arranged to allow the tilting of said shutter between its fully closed position and a maximum open position at against the elastic means, and a manually actuated cam rotatably mounted between a first position, corresponding to the cold start, where it cooperates with said linkage p or limit the stroke at the opening of the shutter in a partially open position, at least a second position, corresponding to
  • this carburetor is relatively complex and costly to produce because it comprises a large number of different parts which are movable relative to one another.
  • the invention aims to produce a carburetor of the above type which is of a particularly simple and inexpensive construction.
  • the subject of the invention is a carburetor of the aforementioned type, characterized in that the cam comprises an appendage which, in the first position of the cam, is interposed in the path of movement of the joint and which, in the second position of the cam is outside the path of movement of the joint.
  • the vacuum-sensitive actuating device can actuate the flap between the minimum and maximum opening positions, and this by means of a minimum of modifications compared to a conventional carburetor such as this will result from the rest of the description.
  • the cam has a first surface which cooperates with the articulation to fix the minimum opening position of the flap in the second position of the cam and to fix the fully open position of the flap in the third position of the cam, and a second surface formed on the appendage and which cooperates with the articulation to fix the position of the shutter ajar in the first position of the cam.
  • the linkage is constituted by a link connected respectively to a movable membrane of the device sensitive to depression and, by the articulation, to a lever integral in rotation with the air flap.
  • the maximum opening position is the fully open position of the shutter.
  • FIG. 1 schematically illustrates the mechanism with a conventional starting flap of a carburetor of which the outline of the body 1 has been shown in fine lines, assumed to be transparent for the clarity of the drawing.
  • the body 1 comprises a venturi 2 in which is mounted a fuel spray device 3. Downstream of the venturi 2, a throttle valve 4 is rotatably mounted around an eccentric axis 5 between a completely closed position delimited by a stop 6 and a fully open position. The rotation of the butterfly 4 is controlled by a lever 7 to which is hooked a spring 8 urging the butterfly 4 towards its closed position.
  • An air flap 9 for the cold start is also rotatably mounted around an eccentric axis 10 in the body 1, upstream of the venturi 2. This flap can switch between a completely closed position delimited by a stop 11 and a total open position which is that shown in Figure 1.
  • the axis 10 is integral with one end of a lever 12 which controls the movements of the air flap 9 between its open and closed positions.
  • a spring 13 attached to the lever 12 biases the flap 9 towards its closed position.
  • the other end of the lever 12 is connected by a linkage 14 to the membrane 15 of a capsule 16 whose internal volume is placed in communication by a pipe 17 with that of the intake manifold (not shown) of the engine (also not shown) on which the carburetor is mounted.
  • a vacuum prevails at the intake manifold, the membrane 15 is drawn towards the inside of the capsule against a spring 18.
  • the linkage 14 comprises a first link 19 articulated at one end on the lever 12 and the other end of which 20 is slidably received in a buttonhole 21 of a second link 22 integral in translation with the membrane 15.
  • the articulation axis 23 of the lever 12 with the connecting rod 19 is guided in a light 24 of a cam 25 articulated around an axis 26 parallel to the axes 5, 10 and 22.
  • the rotational movements of the cam 25 around of its axis 26 are controlled by a lever 27 integral with the axis 26 and a rod 28 with manual actuation.
  • a part of the external contour of the cam 25 constitutes a first cam surface D with which the free end of the lever 7 cooperates, while the opposite edges of the light 29 define two other cam surfaces E and F with which the end of lever 12.
  • the lengths of the links 19 and 22 and of the buttonhole 21 are such that, in this position, the membrane 15 being completely pushed back by the spring 18, the end 20 of the link is in support against the bottom of the buttonhole 21, on the side of the free end of the link 22. Simultaneously, during the rotation of the cam 25, the cam surface D gradually pushes the lever 7 to half open the throttle valve 4 as far as in the position of figure 2.
  • a first "pushing" of the choke is carried out which brings the cam 25 into the position shown in FIG. 4.
  • the cam surface E pushes back the articulation 23 and rotates the lever 12 and the air shutter 9 to the partial open position of FIG. 4.
  • the air / petrol mixture supplied by the carburetor is therefore leaner than in the case of accelerated idling of Figure 3, while still being substantially richer than in the fully open position of the air flap.
  • the rotation of the cam 25 also has the effect of allowing the butterfly valve 4 to close thanks to the adapted profile of the cam surface D.
  • the carburetor provides the engine with a mixture of relatively high richness, whatever the engine speed (idle, acceleration, deceleration or stabilized speed). This richness can only be reduced by manually pushing the choke as the engine warms up. When the engine has reached a normal operating temperature, the choke should in principle be pushed back fully and the flap 9 will be wide open, as shown in Figure 1.
  • FIGS. 5 to 8 represent the starting flap mechanism according to the invention in different positions corresponding respectively to those of FIGS. 1 to 4 and on which the same reference numbers increased by the number 100 have been used to designate analogous elements.
  • the cam 125 has an external contour, a first part of which constitutes a cam surface D 'cooperating with the end of the lever 107 and playing the same role as the cam surface D, namely ajar the butterfly valve 104 when the choke is fully fired.
  • the cam 125 does not include a light but an appendage 130 in the form of a hook, the inner contour of which constitutes a cam surface F 'extending another cam surface E'.
  • This cam surface E ′ plays the same role as the cam surface E and is defined by a second part of the external contour of the cam 125.
  • the linkage 114 is a simple link articulated on the lever at 123 and on the membrane 115 of the capsule 116.
  • the length of the link and the stroke of the membrane 115 are adapted to allow tilting of the flap 109 between its fully closed position and its position d total opening.
  • Figure 5 shows the mechanism in the position where the choke is fully pushed. In this position, the mechanism according to the invention plays exactly the same role as that of FIG. 1, the cam surface E 'holding the flap 109 in the fully open position.
  • the appendix 130 which acts as a stop, is retracted by the rotation of the cam 125, as shown in FIG. 8: in fact, in this position of the cam 125, the lever 112 is free to switch between the fully open position of the shutter of FIG. 8 and a minimum open position delimited by the abutment of the joint 123 against the cam surface E '•
  • the position of the starting flap 109, and therefore the enrichment of the mixture no longer depend solely on the position of the choke, but also on the operating conditions of the engine.
  • the vacuum in the intake manifold is high because the opening of the throttle valve is small.
  • the membrane 115 then has maximum clearance and completely opens the air flap 109.
  • the engine although cold, operates with an unenriched mixture identical to that which is supplied to it hot.
  • the membrane 115 of the mechanism according to the invention continues to adapt the richness of the mixture to the load of the engine until the choke has been pushed back completely.
  • the mechanism according to the invention therefore makes it possible to achieve significant fuel savings by depleting the mixture in all conditions where the cold engine is operating under low load.
  • Figure 9 which shows consumption curves in liters / 100 km as a function of the mileage covered after start-up, illustrates the savings thus achieved: indeed, curve B consumption of an engine equipped with an improved carburetor according to the invention after cold start indicates consumption considerably lower than that of the same engine operating under the same conditions, but with a conventional carburetor (A).
  • FIG. 10 shows, in partial section, a particular embodiment of the carburetor body 101 according to the invention mounted on an intake manifold 131.
  • the pipe 117 opens out by two conduits in parallel 132 and 133 in a duct 134 which communicates with the interior volume of the intake manifold 131.
  • the duct 132 has a calibration 135 while a unidirectional ball valve 136 is interposed between the duct 117 and the duct 133.
EP82400226A 1981-03-03 1982-02-09 Vergaser für eine Brennkraftmaschine mit innerer Verbrennung Expired EP0059654B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8104185A FR2501293B1 (fr) 1981-03-03 1981-03-03 Procede d'alimentation en melange air-essence d'un moteur a combustion interne et carburateur pour sa mise en oeuvre
FR8104185 1981-03-03

Publications (2)

Publication Number Publication Date
EP0059654A1 true EP0059654A1 (de) 1982-09-08
EP0059654B1 EP0059654B1 (de) 1984-07-18

Family

ID=9255802

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82400226A Expired EP0059654B1 (de) 1981-03-03 1982-02-09 Vergaser für eine Brennkraftmaschine mit innerer Verbrennung

Country Status (6)

Country Link
US (1) US4439377A (de)
EP (1) EP0059654B1 (de)
CA (1) CA1197742A (de)
DE (1) DE3260384D1 (de)
ES (1) ES510045A0 (de)
FR (1) FR2501293B1 (de)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3445839C2 (de) * 1984-12-15 1997-03-13 Stihl Maschf Andreas Startautomatik für einen Verbrennungsmotor, insbesondere den Motor einer Motorkettensäge
JPS62279259A (ja) * 1986-05-28 1987-12-04 Sanshin Ind Co Ltd オ−トチヨ−ク装置
DE3842974A1 (de) * 1988-12-21 1990-06-28 Stihl Maschf Andreas Membranvergaser mit stellungsabhaengig gekoppelter drosselklappe und chokeklappe
DE4117554B4 (de) * 1991-05-29 2004-05-27 Walbro Gmbh Vergaser für eine Brennkraftmaschine, insbesondere einer Motorsäge
DE4120876C2 (de) * 1991-06-21 2003-03-06 Stihl Maschf Andreas Arbeitsgerät, insbesondere Motorkettensäge
JP3864027B2 (ja) * 2000-02-10 2006-12-27 株式会社共立 吸気制御機構
US6439547B1 (en) * 2001-03-05 2002-08-27 Walbro Corporation Carburetor throttle and choke control mechanism
JP4414115B2 (ja) * 2001-08-03 2010-02-10 本田技研工業株式会社 気化器のチョーク弁装置
US6779785B2 (en) * 2002-07-25 2004-08-24 Walbro Engine Management, L.L.C. Self-relieving choke adjustment apparatus
US6851664B2 (en) * 2003-05-15 2005-02-08 Walbro Engine Management, L.L.C. Self-relieving choke valve system for a combustion engine carburetor
US7144000B2 (en) * 2004-08-24 2006-12-05 Briggs & Stratton Corporation Automatic choke for an engine
CN102777284A (zh) * 2012-07-17 2012-11-14 星月集团有限公司 汽油机空滤器自动风门装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE929399C (de) * 1952-06-26 1955-06-27 Gen Motors Corp Vergaser fuer Brennkraftmaschinen
FR2220680A1 (de) * 1973-03-06 1974-10-04 Honda Motor Co Ltd
FR2393161A1 (fr) * 1977-06-02 1978-12-29 Sibe Perfectionnements aux carburateurs munis d'un volet de depart

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3190623A (en) * 1961-08-01 1965-06-22 Chrysler Corp Automatic choke for carburetor
JPS5435261B2 (de) * 1972-08-10 1979-11-01
US3837322A (en) * 1973-07-30 1974-09-24 Honda Motor Co Ltd Carburetor choke
DE2525594C3 (de) * 1975-06-09 1980-01-24 Honda Giken Kogyo K.K., Tokio Steuereinrichtung an einem Vergaser für Brennkraftmaschinen für Anlaß- und Kaltstartbetrieb
US3962380A (en) * 1975-10-14 1976-06-08 Ford Motor Company Carburetor with combined choke pulldown and fast idle cam kickdown apparatus
FR2470255A2 (fr) * 1979-11-23 1981-05-29 Sibe Perfectionnements aux carburateurs comportant un dispositif auxiliaire de depart

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE929399C (de) * 1952-06-26 1955-06-27 Gen Motors Corp Vergaser fuer Brennkraftmaschinen
FR2220680A1 (de) * 1973-03-06 1974-10-04 Honda Motor Co Ltd
FR2393161A1 (fr) * 1977-06-02 1978-12-29 Sibe Perfectionnements aux carburateurs munis d'un volet de depart

Also Published As

Publication number Publication date
FR2501293B1 (fr) 1985-06-07
CA1197742A (fr) 1985-12-10
US4439377A (en) 1984-03-27
EP0059654B1 (de) 1984-07-18
DE3260384D1 (en) 1984-08-23
ES8303608A1 (es) 1983-02-01
ES510045A0 (es) 1983-02-01
FR2501293A1 (fr) 1982-09-10

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