DE1626545B1

DE1626545B1 - Carburettors for internal combustion engines

Info

Publication number: DE1626545B1
Application number: DE19631626545D
Authority: DE
Inventors: Mennesson Andre Louis
Original assignee: Societe Industrielle de Brevets et dEtudes SIBE
Current assignee: Societe Industrielle de Brevets et dEtudes SIBE
Priority date: 1962-07-13
Filing date: 1963-07-02
Publication date: 1970-03-12
Also published as: GB974212A; FR1335659A; ES289277A1

Description

1 21 2

Die Erfindung betrifft Vergaser für Brennkraft- im Ansaugkanal die willkürlich betätigbare Hauptmaschinen mit einem stromauf von einem Willkür- · drosselklappe· angeordnet ist. Danach ist. es auch belieh betätigbaren Hauptdrosselorgan im Ansaugkanal kannt, daß dieser vom Brennstoffhauptkanal abzweiangeordneten Hilfsdrosselorgan, mit einem im Brenn- gende Leerlaufkanal stromab der Hauptdrosselklappe stoffhauptkanal zwischen Hauptdüse und einer 5 in den Ansaugkanal mündet. Die Brennstoffdosie-Brennstoffquelle angeordneten, mit dem vom Unter- rung bei einem Vergaser dieser bekannten Art erdruck im Ansaugkanal betätigten Hilfsdrosselorgan folgt hierbei einzig und allein durch eine oder mehverbundenen, mit einer Drosselstelle zusammenwir- rere radiale Öffnungen, die bei der von der Hilfskenden profilierten Dosierglied und einem aus dem drosselklappe gesteuerten Verschiebebewegung des Brennstoffhauptkanal abzweigenden, zu einer im io Dosiergliedes freigegeben werden. Außerdem handelt Leerlaufbetrieb stromab des Hauptdrosselorgans in es sichbeidieserbekanntenAusführungsformumeinen den Ansaugkanal ausmündenden Leerlaufgemisch-; , schwimmerlosen' Vergaser, der zwangläufig mit unter öffnung führenden Leerlauf kanal. Druck stehendem Brennstoff versorgt werden muß.The invention relates to carburetors for internal combustion in the intake duct, the arbitrarily actuated main engines with an upstream of an arbitrary · throttle · is arranged. After that is. it also borrowed operable main throttle member in the intake channel knows that this is separated from the main fuel channel Auxiliary throttle body with an idling duct in the burning end downstream of the main throttle valve Main material channel between the main nozzle and a 5 opens into the intake channel. The fuel dosing fuel source arranged, with the erdruck from the under- in a carburetor of this known type Auxiliary throttle device actuated in the intake duct follows solely through one or more connected, with a throttle point tangle together radial openings, which in the case of the auxiliary ends profiled metering element and a sliding movement controlled by the throttle valve Main fuel channel branching off to be released to one in the io metering member. Also acts Idle operation downstream of the main throttle is common to this known embodiment idling mixture opening into the intake duct; 'floatless' carburetor, which inevitably comes with under opening leading idle channel. Pressurized fuel must be supplied.

Bekanntlich sind bei derartigen Vergasern der Bei der Ausführungsform nach der britischen Pa-It is known that in the case of such carburetors, in the embodiment according to the British Pa-

durch das Hilfsdrosselorgan bestimmte Durchtritts- 15 tentschrift 402148 wird, nachdem durch die Hilfsquerschnitt für Luft und der durch das Dosierglied drosselklappe eine Nadel von der Brennstoffzufuhrbestimmte Durchtrittsquerschnitt für Brennstoff theo- Öffnung abgehoben ist, der in den Leerlaufkreis ströretisch zueinander proportional, so daß Luft und mende Brennstoff einzig und allein durch eine gleich-Brennstoff, die unter der gleichen Druckdifferenz ge- bleibende Kalibrierung gesteuert, wodurch der Brennliefert werden, ein Gemisch konstanter Zusammen- 20 stoffdurchsatz über einen gewissen Öffnungsbereich setzung bilden. der Hauptdrosselklappe und demzufolge auch derthrough the auxiliary throttle element certain Durchtritts- 15 tentschrift 402148 is after through the auxiliary cross-section for air and the throttle valve determined by the metering member, a needle of the fuel supply Passage cross-section for fuel theo- opening is lifted, the disturbance in the idle circuit proportional to each other, so that air and mende fuel solely through an equal fuel, the calibration, which remains under the same pressure difference, is controlled, as a result of which the burn delivers a mixture of constant substance throughput over a certain opening area form settlement. the main throttle and consequently also the

Die Erfindung bezieht sich insbesondere, wenn Hilfsdrosselklappe konstant bleibt. Jenseits dieses auch nicht ausschließlich, auf solche Vergaser, bei Öffnungsbereiches kann zusätzlich Brennstoff durch denen das Hilfsdrosselorgan durch eine exzentrische die Hauptdüse in den Raum zwischen den beiden Klappe gebildet wird, die sich unter der Einwirkung 25 Drosselorganen über die größer werdende Anzahl der im Ansaugkanal strömenden Luft entgegen der von radialen Öffnungen einströmen. Da in diesem Wirkung einer Feder oder eines Gegengewichts zu Raum die Luftgeschwindigkeit nahezu Null ist, legt öffnen sucht. Mit einer derartigen Anordnung kann .' sich der durch diese Öffnungen austretende Brennzwischen den beiden Drosselorganen ein praktisch ..stoff zunächst hauptsächlich.auf der unteren Wandkonstanter Unterdruck auf rechterhalten werden. 30 des Ansaugkanals an, worauf'er entlang dieser in The invention relates in particular when the auxiliary throttle remains constant. Beyond this also not exclusively, on such carburettors, at the opening area additional fuel can through which the auxiliary throttle body through an eccentric the main nozzle in the space between the two Flap is formed, which is under the action of 25 throttling organs over the increasing number the air flowing in the intake duct counter to that of the radial openings. Because in this Effect of a spring or a counterweight to space the air velocity is close to zero places open looking. With such an arrangement. ' the fire emerging through these openings is between the two throttle organs a practical .. material initially mainly.on the lower wall constant negative pressure on the right. 30 of the intake duct, whereupon along this in

Berm Arbeiten im Langsam- bzw. Leerlauf weisen Richtung auf die Hauptdrosselklappe fließt. Da hierjedoch Vergaser dieser Art einige Nachteile auf. Die bei der Brennstoff keinesfalls kontinuierlich oder geangesaugte Brennstoffmenge ist dann nämlich sehr... nau dosiert an der Hauptdrosselklappe ankommt, gering, und der Brennstoff gelangt in eine Kammer lassen sich unerwünschte Änderungen der Arbeitsgroßen Volumens, in der die Luftgeschwindigkeit fast 35 weise des Motors mit dieser Ausführungsform nicht Null ist, so daß das Leerlaufgemisch wenig homogen vermeiden.Berm work at low or idle speed indicates direction of flow to the main throttle valve. There, however Carburetors of this type have some disadvantages. The fuel is by no means continuously or sucked in The amount of fuel is then very ... precisely dosed arrives at the main throttle valve, small, and the fuel gets into a chamber, undesirable changes in the working size can be Volume in which the air speed almost 35 wise the motor with this embodiment does not Is zero, so avoid the idle mixture being less homogeneous.

ist und zu einem unregelmäßigen Arbeiten des Mo- Schließlich ist aus der britischen Patentschriftis and to an irregular working of the mo- Finally is from the British patent specification

tors in diesem Betriebszustand führt. 281027 ein Vergaser anit willkürlich betätigbarertors in this operating state. 281027 a carburetor that can be operated at will

Aus der USA.-Patentschrift 3 003 754 ist ein Ver- Hauptdrosselklappe und einem Hilfsdrosselorgan begaser bekannt, bei dem die Leerlauf gemischöffnung 40 kannt, das in der Form einer mittig gelagerten und bei jeder Stellung der Hauptdrosselklappe stromab in axialer Richtung im Ansaugkanal verschiebbaren dieser Klappe liegt, und bei dem die Brennstoffzufüh- Scheibe ausgebildet ist und sich in Äbhängikeit vom rung für die Leerlaufdüse mit der Hauptdüse in Ver- Lüftstrom im Ansaugkanal selbsttätig öffnet. Bei diebindung steht. Dieser bekannte Vergaser weist je- ser Ausführungsform steht das Hilfsdrosselorgan doch keine Hilfsdrosselklappe."auf, deren Öffnung «!über eine Stange mit einem federbelasteten Kugelvom Luftdurchsatz abhängig ist, sondern lediglich ventil in Verbindung, das bei einer Verschiebung des eine in Abhängigkeit von der Temperatur einzustel-~ * Hirfsdrosselorgans in Strömungsrichtung der Luft die lende Starterklappe. Beim Übergang vom Leerlauf Brennstoffzufuhr zum Leerlaufkreis und zur Hauptzu höheren Drehzahlen erfolgt bei dieser bekannten düse freigibt.. Auch hierbei wird der Brennstoff für Ausführungsiorrn bis zum Einsatz der Hauptdüse 50 das Leerlaufgenüsch stromauf der dosierten Brenneine ungenügende Brennstoffzulieferung. stoff zur Hauptdüse liefernden Drosselstelle über eineFrom the United States patent specification 3 003 754 a main throttle valve and an auxiliary throttle element is gassed known, in which the idle mixing port 40 knows that in the form of a centrally mounted and in any position of the main throttle valve can be displaced downstream in the axial direction in the intake duct this flap is, and in which the fuel feed disc is formed and dependent on the tion for the idle nozzle with the main nozzle in the air flow in the intake duct opens automatically. In the case of the bond stands. This known carburetor has the auxiliary throttle element in each embodiment but no auxiliary throttle valve. "open whose opening"! via a rod with a spring-loaded ball from Air flow is dependent, but only valve in connection, which is when the one to be adjusted depending on the temperature ~ * Hirf throttle organ in the direction of air flow loin starter flap. At the transition from idle fuel supply to idle circuit and main supply This known nozzle releases higher speeds. Here too, the fuel is used for Execution orrn up to the use of the main nozzle 50 the idle fuel upstream of the metered fuel line insufficient fuel supply. substance to the main nozzle via a throttle point

Weiterhin sind aus der deutschen Patentschrift gleichbleibende Kalibrierung abgezweigt. Diese KaIi-595128 sowie aus der britischen Patentschrift brierung jnündetzwischeirden beidenDrosselorganen 402148 Vergaser bekannt, bei denen stromauf der direkt in den Ansaugkanal, wobei ihr in einem Abwillkürlich betätigbaren Hauptdrosselkl'appe im An- 55 stand die Eintrittsöffnung eines Leerlaufkanals gegensaugkanal eine exzentrisch gelagerte, auf den Unter- überliegt, der stromab der Hauptdrosselklappe in den druck im Ansaugkanal ansprechende Hilfsdrossel- Ansaugkanal mündet. Bei geschlossener Hauptdrosklappe angeordnet ist, deren Öffnung eine Funktion seiklappe soll im Leerlauf über diesen Leerlaufkanal der durchströmenden Luftmenge ist und die über der aus der Kalibrierung austretende Brennstoff zuein Gestänge mit einem Dosierglied zur Steuerung 60 sammen mit der Luft im Änsaugkanal zwischen den des Brennstoffzuflusses zu einer im Ansaugkanal beiden Drosselorg'anen abgesaugt und stromab der zwischen den beiden Drosselorganen angeordneten Hauptdrosselklappe in den Ansaugkanal eingeleitet Brennstoffhauptdüse verbunden ist. Bei diesen be- werden, während bei stärkerer Öffnung des Hilfskannten Ausführungsformen zweigt aus einem strom- drosselorgan ein profiliertes Dosierglied den Brennauf des Drosselquerschnitts der Brennstoffzumeß- 65 stoff durch eine Drosselstelle zur Hauptdüse ausdüse liegenden Ringkanal ein zu einer Leerlauf- treten läßt und mit stärker werdender Luftströmung gemischöffnung führender Hilfskanal ab, wobei im im Ansaugkanal die freie Verbindung zwischen Kali- : Bereich der Mündung der Leerlaufgemischöffnung brierung und Leerlaufkanal unterbrochen wird. AuchFurthermore, constant calibration has been branched off from the German patent specification. This KaIi-595128 as well as from the British patent specification now between the two throttling devices 402148 known carburetor, in which the upstream of directly into the intake duct, taking her in an abvoluntary The main throttle valve which can be actuated is positioned against the inlet opening of an idle channel an eccentrically mounted, on top of the lower, which is located downstream of the main throttle valve in the Pressure in the intake port responsive auxiliary throttle intake port opens. With the main throttle valve closed is arranged, the opening of which is a function seiklappe should idle via this idle channel the amount of air flowing through and the amount of fuel exiting from the calibration is closed Linkage with a dosing member for control 60 together with the air in the Änsaugkanal between the of the fuel inflow to one of the two throttle bodies in the intake duct and downstream of the The main throttle valve, which is arranged between the two throttle elements, is introduced into the intake duct Main fuel nozzle is connected. Load with these, while with greater opening of the auxiliary knowledge Embodiments, a profiled metering element branches off the combustion run from a flow throttle element of the throttle cross-section of the fuel metering material through a throttle point to the main nozzle lying ring channel a to an idle can occur and with increasing air flow Auxiliary channel leading to the mixture opening, whereby in the intake channel the free connection between potash: Area of the mouth of the idle mixture opening brierung and idle channel is interrupted. Even

Claims

3 43 4

with this known embodiment, the position can be held or by a potassium

The disadvantages set out above cannot be avoided, brier opening with invariable cross-section

because in this latter known carburetor also be formed.

the calibration for the idle fuel in the loading The operation of such carburetors is known

rich of the main nozzle opens freely into the intake duct. : 5 and therefore does not need to be explained in detail

The invention has for its object to be one. In particular, it is known that in the empty

Carburetor of the type described at the beginning will run out when the throttling devices 2 and 3 are almost closed.

zubilden that a quiet idle and a steady sen are the speed of the air in the section

The transition from idling to high speeds of the intake duct is extremely low, so that the

is enough. ·. "10 from the main nozzle 5 δ only emerging fuel

According to the invention, this task is difficult to carry along to the main throttle element 2, solves that the idle channel from the one with which it flows, then rather through its own weight Atmosphere-communicating fuel of the walls without being swelled by the air flow constant levels of outgoing fuel-7 is taken, resulting in an irregular main channel branches off downstream of the throttle point and results in 15 idle work.

idling ¹ when the main throttle is opened. This disadvantage is remedied by the fact that the mixture opening upstream from the main throttle element to idle mixture opening 19 is exposed to the negative pressure. is set, which is in the intake duct downstream of the main

An example embodiment of the Rrfin- organs 2 prevails and is considerable, so that remainder is explained in more detail below with reference to the drawing 20 gens only an opening with an extremely small cross, which schematically requires a detail according to the invention. This negative pressure is shows formed carburetor in longitudinal section. through the idle channel 18 on the fuel

The carburetor can transmit as a whole, apart from the main channel 5, and it is sufficient if it is on Means for introducing the metered fuel orifice 19 of the idle channel 18 into the feedstock in the intake duct, can be designed as desired. 25 suction channel 1 is at least slightly larger than that In the embodiment shown, there is negative pressure upstream, that in section 11 of the intake duct an arbitrarily operable main throttle member 2 prevails to ensure that the whole through In section 7 of the intake duct 1, an auxiliary throttle, the metering member 4, metered fuel of the idling element 3 arranged, the mixing opening 19 flows in as an eccentric flap.

is formed. This is actuated via a displaceable 30. If it turns out that the idle mixture rod 17 has a profiled metering member 4, which with an opening 19 is so small that it does not cooperate economically throttle point 14 and the fuel Hch can be produced Another opening - throughput to a main fuel channel 5.5 α control 22 are provided, which is the idle channel, which via a main nozzle 5 b into the section 35 lying between the 18 and section 11 of the intake duct connecting throttle elements 2 and 3 det, which actually opens from the idle duct 18 11 of the intake duct. The throttle element 2 transmitted to the main fuel channel 5 is actuated by the driver via a shaft 6, while the pressure is reduced.

rend the throttle member 3 mounted on a shaft 8 It is namely appropriate that this is empty, which in turn with a return device in running through the idle channel 18 on the main connection stands, which the effect of the sub- 40 channel 5 transferred negative pressure is hardly greater than pressure on the eccentric flap 3 counteracts. the one prevailing in section 11 of the intake duct This return device can be activated by a vacuum to create a profile for the metering shaft 8 fixed and with a tension spring 10 can be used 4 that no discontinuity linked lever 9 are formed. between idling and running

The fuel comes from a through an opening 45 with higher speeds, in which the opening 13 with the atmosphere connected fuel through the part 5 α of the main channel and float tank 12. The main nozzle 5 b supplied to the engine is to be delivered.
The amount of fuel depends on the instantaneous Since the idle mixture opening 19 in the cross-section of the throttle point 14, which is the free vicinity of the edge of the main throttle element 2, ge cross section between the throttle element 4 and a 50 reaches at a small opening of the main throttle-fixed orifice 4 α corresponds. The fuel immediately flowing through this throttle organ 2 through the idle mixture opening 19 to selstellel4 comes from the upstream side of the latter, so that the float tank is connected to the chamber 15, which is connected by a channel 16 to the negative pressure prevailing in it. as the b to the main nozzle 5 sub-acting

Downstream of the throttle point 14, the combustion pressure branches off. The fuel delivery then takes place through the main fuel channel 5 from an idle channel 18, the current to the main nozzle 5 b, and the carburetor works in an idle manner in the direction of the main throttle element 2. _-
Mixture opening 19 opens, which, at least in this way, allows the fuel to pass through at least part of the metered fuel 60 completely downstream of the main throttle, without disturbing the long main throttle body occupying its idle position during normal operation of the carburetor. Introduce the idle mixture opening organs 2, whereby the An-19 is, as shown in the drawing, preferential essence of fuel in section 11 of the instructions immediately downstream of the point, which avoids the suction channel and thus the operation in the edge of the main throttle element 2 occupies, if this operating condition is improved,
this is in its idle position. 65.

The cross section of the idle mixture opening 19 ratentansprucne:

can optionally by a regulating screw 20 1. Carburetor for internal combustion engines with a

be adjusted by a spring 21 in its upstream of an arbitrarily operable

Main throttle element arranged in the intake duct, with an auxiliary throttle element in the main fuel duct arranged between the main nozzle and a fuel source, with the negative pressure Auxiliary throttle member actuated in the intake duct connected, with a throttle point cooperating profiled metering member and one branching off from the main fuel channel to one downstream of the in idle mode Main throttle body in the intake channel opening out idle mixture opening leading idle channel, characterized in that

the idle duct (18) branches off from the main fuel duct (5 a, 5, 16) emanating from the constant level fuel source connected to the atmosphere downstream of the throttle point (14) and, when the main throttle element (2) is opened, the idle mixture opening (19) upstream of the main throttle element comes to rest.

2. Carburetor according to claim 1, characterized through an opening (22) which connects the idle channel (18) with the one between the main throttle element (2) and the auxiliary throttle member (3) lying section (11) of the intake duct connects.

1 sheet of drawings