DE1816237B2 - Carburetors for internal combustion engines - Google Patents

Description

λ ο r> nh Hip Use of an electromaguet

mmg 29 is pulled away from the valve seat 26, so that Dun * me ν _membrane switch 34 is achieved

Additional air through valve 25 downstream of the main \ entih30 J ^ J ^ J ^ of the additional air supply. Can flow into the intake throttle valve 10 ^ ^^ Κ £ membrane switch 34 is such Thus, the through the throttle bore 12 which the £ ™ ^ f _ne ^Q _Membrail 35 in two unterschiedh-space 13 of air supplied during the sliding hardware 5 that "* udi ane Me ^^ ^ _{of those}

drive both in the intake duct and to the before JJjJJ ^ g ^ _{37 via} the line 42 with idle system, while they during the the ^ ueroruc intake line system

Idle operation committee in the Leer aufsystem ^^ SHmnktert and from which the flows. The amount of air passing through the valve 25 (mcht J ^ g ^^ T ^ inner single set of can be determined by the dimensioning of the inner diameter xo Aj ^ jg "^ ™! ^ Contacts 39 or 40 of the bore 24, preferably for movable ^ """JJ ^ _evictions contact 39 by about 600mniHg. The throttle bore 12 is so nn« ^ wjjvondeu »the ^^ _{y connected} . Inside diameter dimensioned that in space 13 a clasp ^ 41 mn Q resting state under the

During idling there is a pressure, the _{membrane 35 ^ g ^ on diß K}

which causes an idle mixture that ensures a perfect 15 effect ^ the ijeaj * ^ _{moving contact} 39 of free operation. TtaLnary contact 40 is kept away.

During the overrun, the ^sta ^ ° ^ _k ™ _a ^ _et .Ventil, on the other hand, has a considerable amount of air in the line 23 in the anDk »^^ gj ^ del 32, which under the effect

Suction channel out and thus the pressure in the interior ^ ™ ^{in the} ₃₁ ^ _{n rest} state against the Ra ₁ HBl ₃ reduced. This results daflίώβ to _"Q Sg 'g' g * J ^ ¹ _{An additional} l _u ftzuführung the first and second Emulgierlufteinlaß 14 and ^Ve ™" JS _{u {tlei} tung 23 and the Zusatzluftan-15 air flowing amount proportional to the pressure üb "^ ^ ^Z" ™ ^set _the i _usga ngskanal is thereby reduced drop in the space 13, so that by a trittsottnung

the slow speed exit 20 and the idle discharge ^ra ^ P ~ _{ö u of a} motor vehicle of 21 auszusprühende fuel mixture increases enriched * ₅ Be y ^ ° g ™ _e ^g _{rdruck au} f is a height of. That through these two outlets 20 and 21 ^{A. n} _n ^sa ^ ^e ^ ™ ^g ₀ T _r ^te _more . This causes the containing fuel mixture is i ^ runs züge- 6501 nra ^ Hg ode ^ me _{Steuerdruckkam} mer

mixes, which _comes ^{through the opening gap between the M e} mbran35 in ^ ebtu g, Kontakt39

Throttle valve 10 and the outlet 20 flows as well as 37 sucked, and lü ^ ^ _{contact 40 Hierdur} ch

Air, on the one Zusatzluftaustnttsoffnung 29 30 * »rAntage to the ^ta JJ _{ktrom tables} valve at will eefünrt, whereby the amount and the air is the coil aes e β valve needle

BreWstoIv; rhätoi _{S of} the mixture for shear tension gtf ^^ g · helical spring 31 from drive assumes. , H ⁸ Vrntilste 33 is pulled away. This leads to,

According to Fig. 2, the space 13 'is placed in such a way that the valve rtz 33 weggeg _{additional air23 and}

it only blocks the second emulsifying ^{air inlet 15, 35 J ß} dieJuich den Aus ^ ₁₃ , _& . ^ _{Lu {t} so that from the atmosphere through the throttle hole the opening ² * ^ _{ί & υ5ΐήίί500ηυη6} 29 leading tion 12 'fed air with the fuel to the Zusatzmtt intake duct of the

mixed is mixed, which is caused by the slow open passage P ^as « ^ier ^ ⁿ ™ _{n Since} the nozzle 16 is to be guided in this way and that during the idling carburetor get ^ nn _{the ζ} ^ _ζ _

operating from the slow speed exit 20 and the 40 m the R ^a at 13 be ^ _{1 γ u mt the} idle exit 21 emtntt in the intake duct, wah- ^ line M ui the ^ An g ^ ^^

"SSrL ^ clrf will.

1 sheet of drawings

Claims (2)

the section of the intake duct of the carburetor is closed. This measure has the consequence that with sliding 1. Carburetor for internal combustion engines with an operation in the room there is a pressure drop, so downstream of an arbitrarily operable main S that via the idle system with limited air throttle valve Much more fuel is sucked in, which opens into the intake duct, which is then fed into the additional air supply line, which is connected to the downstream of the throttle valve from a valve is controlled, which is an optimal combustible throttle valve via the downstream of the main additional air the pressure prevailing in the sliding mixer for sliding operation. operation is open, with the additional air supply. management is based on a room from which matic drawings on two exemplary the emulsifying air supply for the idle gel explained in more detail. mixed takes place and that with the atmosphere. Fig. 1 is a vertical section through an inven- is bound, characterized in the carburetor according to a first embodiment this space (13) approximately shape via a throttle bore 15; (12) on the air-guiding section of the intake Fig. 2 is a representation corresponding to Fig. 1 channel of the carburetor is connected. ment, which is a modification of the device according to 2. Carburetor according to claim 1, characterized in that F i g. 1 represents. draws that the idle system with a two- To the hydrocarbon content in the exhaust gases th emulsifying air duct via a throttle cross 20 to a minimum during overrun operation, cut (14) with the air-conducting section of the it is essential on the one hand to open the fuel mixture Intake channel is connected. to bring an optimal value and at the same time the Negative pressure in pushing operation to a value hold, which on the one hand does not affect the engine braking effect The invention relates to a carburetor for 25 impaired and, on the other hand, the lowest possible internal combustion engines with a downstream a will- ensures hydrocarbon content,
The main throttle valve, which can be operated recently, is in the 1 is a carburetor in the state of Intake duct opening additional air supply line, overrun operation with essentially completely gedie controlled by a valve shown above the main throttle valve closed. The main downstream the main throttle valve prevailing pressure 30 throttle valve 10 is on a rotatable shaft is open in push mode, with the additional air attached. supply line emanates from a room, through a throttle bore 12 is a room 13 which is connected to the emulsifying air supply for the idling with the atmosphere. This room mixes up takes place and which is connected to the atmosphere provides a first and a second emulsifying air. 35 inlet 14 or 15. Through the first emulsifying air A carburetor of this type is known in which air entering inlet 14 becomes the low-speed auxiliary air when overrun is fed to the nozzle 16, where it is in a predetermined Mi-fuel consumption to be reduced by the impurity ratio with the liquid fuel downstream of the throttle valve is mixed, which is from a fuel source (not is so that an increased suction of fuel 40 shown) is fed via the inflow channel 17, fuel mixture from the idle system due to the The mixture of air and fuel is in the reduced negative pressure is prevented. This low-speed nozzle 16 metered and atomized and for However, the measure leads to the fact that the machine is then further mixed with by the second emulein Fuel mixture is supplied, the slow-speed maintenance air introduced for the yaw air inlet 15 a complete combustion 45 nozzle 18 supplied. The resulting fuel does not is suitable so that the proportion of hydrocarbon mixture is now through the mixture channel 19 rises in the exhaust gases. out and through the slow speed outlet 20 and It was found that when the idling outlet 21 is considerable downstream, the main throttle rise in the negative pressure during overrun operation rapidly injects the flap 10 into the intake duct of the carburetor with a proportion of hydrocarbons in the exhaust gases. Which is injected through the idling outlet 21 when the engine can then only be adjusted via the zende mixture quantity by means of the idling system with fuel mixture adjustment screw 30, which is customary for idling,
is taken care of. Although it could be by reducing the The space 13 is arranged so that it with the Underpressure, a reduction in the hydrocarbon intake duct downstream of the idle outlet 21 is maintained reach in the exhaust gases, but this would be communicated 55, by means of an outlet 22, a Degradation by the mere supply of additional air again additional air supply line 23, an opening 24, can be reversed, since there is then no combustible valve 25 and additional air outlet opening Mixture is present more. tion 29. The object of the invention is to provide a carburetor of the suction line negative pressure during the To create the type described at the beginning, which ^{moves at 6o} idling operation in the order of magnitude of simultaneous reduction of the intake line under- of 500 mm Hg, so that the valve ball 27 by pressure on a for limiting the carbon, the action of the coil spring 28 against the hydrogen content in the Exhaust gases optimal value tilsitz 26 is printed, whereby the flow of Zuein ensures a favorable air-fuel mixture. set air is interrupted by the valve 25. This object is achieved in that the space, 65 as soon as the vehicle slows down where the emulsifying air supply for idling begins, the suction line negative pressure rises steeply, mixture takes place and which is connected with the atmosphere. B. to more than 650 mm Hg, so that the Ventilden is, via a throttle hole on the air guide ball 27 in the direction of the additional air outlet