DE2128084A1 - Setup for air valve carburetors - Google Patents

Description

Godfather ία t aime 1 α un ^ :,

'£ \ ie Zenith Carburetter Company Ltd., Hone ^ pot Lane, btanmore, I and .

jiinrichtun, -: ./ ei Luf eventilver ^ asern

Jie jirfindUiL-; concerns one; ei constant negative working carburetor, lit a ^ insau ^ iianal, with a throttle flap 2ur ^ liis division ues k-fuel f-air-air, which a r.iit deu yer- ^ cu-.er connected.; .r enn eraftraasctiine zu ^ efüiirt, with an otronaaf from the jjrossei: .. Iappe arranged air valve, the sicu oei.-öt ci. "ti. _: ; in A.-bän ^; i £,; _ eit; from deia Unteramt: einstej.lt, which in the interim aei.i Drosselklappe'und ociiieii dea air valve ( "iüscrucaimaer") • efiiid .. icuen Jeii of xjinsau ^ - Anala aerröOLt and aen Luftdurchflu aui-j ¹ a constant negative pressure in the. kisctuiaramer regulates, and with one in the üinsau ^ .raiial on a steep eininuadenden

rennst of f>, e: .iessungadüse, at which the we ^ jun ^ s ^ uersctinitt of the üin- & au ..:, aTi-als by one of the ^ insteilun .- =; des Luftventiis ^ e-K. ·. fcimiiiten throttle gap ^ e-. iiaet becomes the calibration with increasing ^ f fnun ^ aeö ji'inBaugi.analü changes where, ei is the effective cross-section of the

rennst off eaessungsdüse by adjusting a profile needle and open now, the air valve closed.

sv. uicL ueraus ₀ -estei 11, there-) when using carburetors of the above-mentioned type in connection with racing machines it is not always necessary. Satisfactory idle. e trie., the i-las chine is possible ic t.

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109851/1221

The object of the invention. is a carburetor aer ■ This is called a type of creating a better idle operation erin. glicht.

According to the invention; this is achieved by providing a device i .-.; Preferably, the fuel measurement nozzle forms a narrowed part of the fuel supply channel, which connects the throttle gap in the intake channel with a fuel storage chamber, where the narrowed part with the throttle gap over a part of the fuel supply channel which is greener in diameter than the fuel conditioning nozzle.

Erf is a indungsgeraäJ _rennstoffü> e rführungskanal provided, which with the urossexspalt connecting part of the fuel. ^ Eniessungsduse of. rennst off the supply channel and discharges into the intake / ianal downstream of the throttle valve.

Advantageously, uei the carburetor according to the invention is one Air intake device for feeding through the fuel measuring nozzle Passing fuel to generate a .rennst off air emulsion provided. Daoei is the said emulsion the Einsauglianal both over the throttle gap and downstream from the throttle valve feed -., ar.

Exemplary embodiments of the invention are described below with reference to Illustrations described:

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109851/1221

Fig. "'Shows part of a longitudinal section through a carburetor with the Είη-ricirtun according to the invention, ;

Figure 2 shows a similar partial longitudinal section corresponding to Pig. 1 shows another embodiment. Example of the invention, "where" is provided that: 3 with the help of an adjustable flow regulator, additional air is supplied to the fuel supply for technical reasons drawn in this figure, the Durchflum.egrenzungseinheit in the sections "ene and the tlchwimmerkaiiinier been omitted; Durchflußoegrenzungseinfceit course will be arranged so in practice, the releasing of the öchwiinmer -... a-Nmer .iei ^ t.

According to Figure 1, the carburetor reads from a conventional carburetor ::; ^- rper, of which a part is shown with i - ..ezeictuieter, with an i, insaug ^: anal 11 running therein ausamnienwirivit with a separate end surface H of the air valve slide, which is movable through the channel 11 in a direction perpendicular to the flat surface 14 and thus changes the (^ uersclmitt of the throttle gap 16, which is determined by the -rücke Ic and the bchieu-er 15) .

liin throttle valve 17 is downstream of the air valve slide ^ -er arranged in the intake duct 11; the division of the air valve ■ schie.ers 15 is well known by the negative pressure in the

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Mischiammer 18 controlled by the between the air valve tilschieuer 15 and the throttle valve 17 located part aes Intake channel is formed.

• The intake duct 11 of the carburetor is transformed from an “ei V? partially shown-fuel storage chamber fuel supplied, the ^ fuel level in this name in üolicher way by a float (not shown) is set. In a bore of the gasoline body 10 there is a nozzle 21 which opens to the flat surface 13 of the bridge 12 and at 22 has a smaller diameter johrung part which represents the actual fuel metering nozzle. This measuring nozzle 22 is arranged at a distance from the upper end of the nozzle 21, with which it connects a pipe 23 of larger diameter. A profile needle 24 carried by the lift valve slide 15 runs through the remote measurement nozzle 22 in such a way that the effective cross-section of this opening changes with the position of the air valve slide.

On the outer surface of the nozzle 21 at its upper end, there is a flattening and the wall of the pipe in the carburetor body a cavity 25 bounded by a radiai ^ anal 26 of the The nozzle is connected to the bore part 23 above the Bemassurig nozzle 22 is; a transfer channel 27 running inside the carburetor body 10 connects this cavity 25 with an opening 28, which are in such a position towards Einsaugi-canal 11 opens to be downstream of the throttle valve 17, except close to its edge, when the throttle valve is closed. The throttle valve edge then moves over the opening 28 when it is a very small angle from the closed Position is moved out.

BAD ORIGINAL J * M ^ " -5." · '

109851/1221

When the throttle valve is completely or almost closed, a high suction effect occurs at the opening 2ö, so that part of the metered run off it is fed directly downstream from the throttle valve 17 by passing over the radial xcanal 2b, the cavity 25 and the Üoerf üarungs ^ anal 2? is sucked out of the eye .ohrurigsteil 25 with a larger diameter of the nozzle 21, while reading of the metered fuel is fed in üoiicher 'V.'eise the Drosseispalt sixteenth The result of the cavity 25 is that the structural effect occurring at the radial canal 26 is less than that which is effective at the opening 28. ei your size from de *.! Volume of the cavity 25 depends, and --Wcxr in such a way that, with increasing volume of the cavity, the difference between the structural wire at the opening 20 and at the radial channel 26 is increased. In this way, the cavity 25 has the properties of an organ of mood. If the throttle valve opens beyond a certain position, the structural effect occurring at the opening is not greater than that which is effective at the throttle gap 16, so that essentially the whole allotted. fuel flow through the throttle slot, where the total fuel supply is adjusted at all times by the effective oversize of the fuel nozzle. When the throttle valve is closed again, fuel is initially sucked out of the cavity 25 and fed through the air duct 27 to the opening 2d, in such a way that the initial fuel flow stops when the throttle valve is closed is fed out of the cavity 25 or is sucked into the cavity 25 by the fuel that is sucked into the cavity 25 from the back, to which the cavity 25 opens. "else is achieved da3 through the transfer channel 27 of the fuel rather flows as would be the case if the Vl Ό erführ ungs channel 27 with the

BATH ORIGINAL 109851/1221

Sohrungteil 23 larger diameter of the nozzle 21 alone ür.er which in the Durclaraesser narrow Itadia H: anal 26 would be connected.

In the one from the side opening of the nozzle to the one in the intake duct opening channel leading to the adjustment of the fuel flow through this channel (not shown) valve provided.

The fuel metering nozzle 22.: Ann through an air duct 29, fe the 'laterally opens into said opening 22 and the intake duct 11 upstream of the air valve slide, it 15 extracts air, Air can be supplied, so that in the nozzle 21 an air-fuel -Emulsion "forms that downstream of the throttle valve 17 your intake duct 11 is fed. The air duct 29 runs preferably with an outward inclination towards the connection point with the fuel break, thereby avoiding the danger will that fuel collects within this channel and prevents the supply of the air forming the emulsion.

The above-mentioned air supply to the fuel oil measurement nozzle is in detail in the German patent application ™. P 2ü 35 772.6 has been described and claimed.

In the one in Pig. 2 shown embodiment of the invention. is an additional air supply for the transferring ^ anal provided, the air of which with the fuel or the fuel-air emulsion, flowing through this channel is mixed. In the applicant's patent application P 21 14 921.3 there is a carburetor of this kind have been described and claimed, including one additional channel provided to the inlet duct stroina :, from

10 9851/1221

to supply air directly to the throttle valve when the throttle valve is closed is in idle position. This additional channel is in cooperation with the throttle valve controlled that the air supply through this channel in the üinsaugkanal upstream of the throttle valve stops, · if the throttle valve moves slightly from the idle position out.

In Fig. 2, the corresponding parts are provided with the same .rezug ζ calibration as in Pig. 1. The additional channel according to the patent application P 21 H 9-21.3 is on the part of Ücerführungskanals 2? provided, which is adjacent to the opening 28 is. An air supply duct runs to the named one Transfer channel.

The air supply duct consists of a part 31 which runs from the intake duct 11 upstream of the air valve slide 15 to an adjustable throughflow limiting unit 32, and a cable 33 which runs from the unit 32 mentioned by him to the transfer duct 27. The unit 32 is located in the drawing in the section of the pig. 2, is _d edoch in practice; ESUG the lüins & ugkanalachse arranged differently so that they do not use the in Pig. 2 float chamber, not shown, comes into contact.

The flow limiting device 32 has a first channel 34 which is connected to a partial channel 31 of the air supply, a second channel 35 which runs parallel to the channel 34 and is closed at one end , a third channel 36 » which the other end of the channel 35 with the channel 34 connects, and a fourth channel 37 connecting the channels 34 and 35 and between

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its ends by a fifth /, anii] .3 ^ nit an 'i'eii .u 33 connected to the air supply ii: t.

Lin threaded plug 39 in a threaded ..oh.ru.ru ,, those with the Lana! 36 aligns, -.eoitzt a rejuvenated end 41, the one? Closing opening of the Lu.nc.lG 36 and oicli crossing pipes 42, 43 has, whereby between the channels and 35 there is a fixed flow limitation i. A second threaded plug 44 in a threaded opening 45 which is aligned with the channel 37 has tapered portions 46 and 47, each of which cooperate with a corresponding portion of the channel 37 on opposite ends of the channel 30 to provide an adjustable flow rate Limitation between channels 34, 35 and 33 Lüden. The actual air flow through the channel 31, 33 is thus determined by the cross-section of the holes 42 and 43 in the plug 39 and by the setting of the tapered parts 46 and 47 in relation to the corresponding parts of the channel 37 with which they interact. The Luftdurchfj_ui; iAnn by .bewegung, of the threaded plug 44 in one or the other clearing can be changed by adjusting the setting of the tapered parts 46 and 47 with respect to the corresponding parts aes _x .anals 37 with which they interact, changed wira.-Le.r extent of control of the actual air flow through the channel 3'j 33 "as it can be set by the /. movement of the 3-thread plug 39, is related to the setting of the ue" -win ^ .estopfens 44. The extent to which the air throughput uei a "certain setting of the threaded plug 44 can be influenced by moving the threaded plug 39 is reduced to a minimum by the cross-section of the ^ ears 42 and 43 οlimited and limited by the adjustment of the tapered part 47 in relation to the corresponding part of the channel 3b with which it collides, to a maximum extent.

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Additional. Advantages of the iL experience channel 27 houses result from this, last through its connection with the ± iinsau ^ icanä.1 stroraai. from the throttle valve to the air emulsion supply system a higher baugwir ^ Tuhg from ^ eü: vfc than it would otherwise be the Ji'all. This higher building efficiency a stct ^ ilisiertuen üinfiuid on the ITuniition des ^ iuuisions supply system from, ..esonaers im hin ^ lici: on the ±, inse is the air supply to the rennetoff nozzle.

BATH ORIGINAL

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Claims (7)

Pat entans ρ r üc h e 1 «_If a constant negative pressure working carburetor rai t intake duct, with a throttle valve for adjustment, aes" fuel-air Gerniscaes, aas a with ae _: a carburettor veruunden i.-ren2i-; raft engine is supplied, ax a: a strcüi- -Air valve arranged on γόη of the throttle valve, dac automatically in Ai. It is dependent on the negative pressure that prevails in the part of the intake duct ("^ iisehkamraer") located between the throttle valve and the air valve and regulates the air pressure to a constant negative pressure in the mixing chamber, and one in the Einsaugv: anal opening out at a location fuel ueiaessungsdüse, ^r to the aer Vi irkungsquerschnitt of Einsaugkanals by a oestimmten the setting of the throttle gap Luftventiis overall. which changes as the opening of the Lirisaug channel increases, the effective cross-section of the fuel measuring nozzle being set by a profile needle and increasing when the air valve is opened, as a result of the fact that a device (23, 25, 26, 27, 28; 31 -is 47) is provided, by means of which, when the throttle valve (17) is completely or substantially closed, part of the ... 2. Carburetor according to claim 1, characterized dadurca, daij the fuel measuring nozzle a narrowed part (22) in ^ rennst off supply ivanal (21), which the throttle gap (16) in Einsaug.canal (11) connects to a ^, fuel storage tank (19), Forms, and that the narrowed part with the Drosseispalt üuer a part (23) of the fuel supply channel connect is'ii ^ 'aer "" a larger you eggs larger in diameter than the fuel; enies— solution nozzle is seated. 10985 1/12 2 1 ORIGINAL BATHROOM 3. Carburetor according to claim 2, characterized in that a. fuel erführmic G ^ anal (27) is provided, which emanates from the ... fuel-.emeεαιΐη ^ εdüse (22) with the throttle gap (Ib) connecting the part (23) of the ". rennst off supply channel (21) and stroma , from the throttle valve (17) opens into the ikinsaugkanal (11). 4. Carburetor according to the preceding claims, characterized in that an air mixing device (29) for the through the. rennst off i.-measurement nozzle (22) passing through run off provided for the production of a run off air emulsion is, and that said jämulsion is the Linsaugkanai (. :) both ü ;; he the throttle gap (16) as well as stromac of the throttle. ". Iap2? e (I7). supply;: ar is. 5. Carburetor after the previous one. In that an additional air supply passage is provided (51) ennseichnet, by the out of; claims, characterized ge _t. air is also supplied to the fuel entering the streamac from the throttle valve (17) into the intake duct (11). b. Carburetor according to Claims 3 and 5, characterized in that the additional air supply duct (31) with the fuel supply duct (27) is connected. 7. Carburetor according to claim 5 or 6, characterized in that the additional air supply duct (3'0 with an adjustable Flow limiter (31 .Ois 47) is provided. BATH 109851/1221 ■■■ Λ- '' * ι - '- V--