US2376991A - Jet carburetor - Google Patents

Description

Patented May 29, 1945 s This specification constitutes limiimpruve-mentl uponiand a continuation in part of my' previous 15, 1943, entitled Jet carmiretcns."4

The objects of the invention are as follows? l.\'1o provide a simplefpracticaland efficient pplication Serial 'Number 472,531, led January;

carburetor of the injection forI internal' connr busticnr engines. A

D 2.To provide a carburetor in which there isl no wet well and no float, I'flierebyjenablingl the device to function 'with equalfacilityfwhenin inverted orany other position. l I f .3.' Toprovide a carburetor having a pre-combu'stion mixingchamber' for fuel" and air', wherethoroughlylblended.` Y

by auT portions or the "combusribremixture .are

4. To lprovide a r'iovel, yet simple and practical t mechanical arrangement',y tof control jet admission of fuel to fa plurali number of orifices ingthe throat' of a Venturi tube of the carburetor f0.1. mixingwith incoming air,` i

vOther objects', vfeatures: and aavantagesv ofthe invention may be observed in the appended` speciflcation and' dra-wing.

" In the drawing:r

' Figure r is an enlargedl detail showing! 'is-'p0rtion vof` the carburetor, ther iigure is rii'ticularly designed to showin detailfthe means used to con--` trol admission. of fuel to the throat ofthe Venturiv tube of the carburetor.

Figure 2 is a further detail showing the fuel regulating valve detached from the carburetor.

Figure 3 is a transverse sectional view taken on line 88, Figure 2, and is designed to showfurther detail of construction adapted to pass fuel through the fuel control valve.

with anincoming fuelvline not shown .in the k4I; having a bored center." The rack is ofcourse movablel within the extension as will be moreparf ticularly set forth in the description of operar tion.

. As shown in Figures i and 3 the valve`321`is tubular in exterior lconguration (and is formed with" a head 33 which is slottedat 3L3m1acrossthe" face thereof, while the body ofthe valvelis ofref duced section at point 32h adjacent thefheadr 33m and extending forwardly a limited distance.

therefrom., A bushing, 31 having a slotted"headl;`

portion 31a. is threadedly secured inthe tubul'arl extension 40 .andis adapted to hold .the` valve 32- The carburetor ofthis invention includes an upper cylindrical portion I2 anda lower bowllike portion I4 in which fue] and air are thoroughly admixed beforemoving into the manifold of an engine, and it also includes means to throttle the volumeof fuel admitted tov an engine.l

The mixing bowl I4 is formed with a smooth inner surface I6 to facilitate movement of vaporized fuel through the device to the intake manifold. The lower face I8 of the bowlis adapted to be flxedly secured upon an intake manifold in any practical manner, -while the `upper surface of the bowl is adapted to receive the cylinder I2 aboverreferred to.

The lower end of the cylinder'i's formed Awith a i flange 28 which is bored at 30 in a direction across the longitudinal axis ofthe cylinder to receive a valve 32 which is movable longitudinally within the bore 30 to control admission of liquid in the end augment therewith. The bushingis also formed with an opening 32g of, somewhat greater diameter than `the reduced section 32h, whereby/an annular space. 32h is formed between@ the bushing` 31 and thereduced sectionf32li ofthe.L valve 32' thus enabling fluid to pass ,there through.

Asshownin Figures l'fand 3 the one"endfof"the f bored centerAUe i'sgsli'glitly recesseddat l41111,` to' form v'an .abutment ,fortv the.. head; 351,` wliifegthe. bushing 31"p'ressing' against the Vother side ofthe head 33 provides an adequate support for the valve in its functional position. f

The body of the valve 32 is bored and threaded at,32c to receive a needle valve38 which is many ually adjustable to minutely regulate the effective area of an orifice. and the volume of liquid fuel which may pass therethrough from the jet 43 positioned in the valve body 32 and extending from the exterior rthereof to a point adjacent the innerendof the needle valve 39.

The `jet or passage-way 4I terminates in a viared opening -45 which is thus shaped to accome modate an increased volume of fuel from the jets or passage-ways 43a, 43h, and 43e which extend from the interior of the valve body to the exterior thereof and which are so located. along the length thereof as to` be normally concealed and covered by the sides of the bore 30 when the valve is in what may be termed engine idlingpofsitiOIL/ The bore 30 and the open. end of the valve '32 terminate in a passage-way 30a in open communication with a circular manifold formed as a groove '30h `in the lower and outer face of the Y tube, 26.

free end of the shaft 10 is provided 4vvithyan.farmi:L manual control to control movement of the rack I gine,l it is onlynecessary that the ignitionkeY or,r

` impulsi; yto start the same.`

` ducedsecnpnpoi the body of the vali/@32", the fneif yfictifs,tlifrougn the bushng'31 andthe slottectheadi`v only/gras above set' fuelhas only l through '.iet 43, however, upon ;movement,ofv the tribution manifold fromA which a plural number Vof jets 52 extend convergingly toward and which terminate in the throat 2Gb of the Venturi Y 5 In order to better control the intake of vaporized fuel I place a valve BIJ in the throat of the Venturi tubeV 26 in such manner that the face thereof is seated against `the under andA divergent side ofthe-Venturi throat 26b l l0 Referncehas previously been made ""to the" pinion-wheel 42, this element is rotated or rocked by means of a shaft which extends through af' bearing 12 formadas an extension of the part'liti Asuitable packing gland may be used to seal the l5 shaft 1 0 with respect to the bearing12,'whi1ethe` v ;A description of the operation of the carbuf retor of this inventionis substantially asy follow .'Assuming thatA the carburetor Ihas been i st'alled'upon the intake manifold of an engine; n and that a controly therefor has been fumsztionally;I

j connectedl with an accelerator `of 'anautomcbile v l orwithahandthrottle as the case. may be; ndf

that the threadedend 'ofthe extension 40 :isrlclonk-i` n netted, with afue1SupD1y1na1thenn that case; as i'n lthe; manner of anyl internal combustion .enfy

switjn be :closed and. the engine givn anvil? .al b' tAlfter the engine has beenstartedl. a fuell puiiinl notshown, forces raw liquid-` fuel into the 'extena V 40 andwthrogh lthe interior of theyrac p44" 'l th ugh'the s'lotsrv33m in the hea'd'f3 alve body 32,v thenceby reasonofgther th, Y

31u andentersthe vcavtyl from whichla portion i O'fY the' fuel will ow through, the jet 43 f and past 40 thelneedl valve' 39, thence through the( ne 'u s andthe flaredwopening of th'egvalve'z, which point'the fuel will.enterthemanifoldringf 30h land the severaL lateral jets' 5.2jeXte'nding th emefrorri;` l', thereby @entering the.' throat of ,the- Venturijtube at itspoint ofgreatest'constriction.

` receding Statement ,covers idling, position f Carb tiene @entre geef-" andthe me; time 15 1 additional fuel to the complete capacity of the carburetor. Concurrently with manipulation of 4the valve Y32, movement ofthe carburetor vcontrol causes the valve v6l) to be moved with respect to: the seatlilla,1 thereby controlling1 the volume of combustibilefuel-"admittedto the .eri'g'ine;f

The preceding matterv is believedto be completely descriptive of my new and improved in- 'je'ction carburetor, the essence of the invention oftwhi'ch resides in extreme ysimplicity of conl struction, unfailing operation, increased emci'ency lover conventional types of carburetion, ease of m'aintenance,= anlj simplicity of adjustment. I have shown and .described the preferiedform of my invention, I do not wish to be understood, as l limiting myself, to the specic showingfherein mada-but ido .claim as apart-of this invention all such-modications :as-defined g In an injection ,type offcarburetor,y means to contr-olfthe, :admission aci: fuel ithereiny-said vmeans vinchiding an elongated tubular housin'g,-av.cylin drical. tracks, movable within saidY f 1 housing, a hanged-tube` int end alignment: with said rack;

said. rrack having a. threadevzlv fend yportion;means to join said rack and tube, saidfrneansy comprising;

aj bushing in .threaded union Y. with said rack and `in -iflush contact with the'flaneeonfsaidtubeiftliea bodylofsaid carburetor;beinggformedwitliaibo I to receivesaid tube, an adjustablef-fjetinfesaidi tube,-=-and otner4jets in saidtube, said-lastrneri-y v' tioned jets extending transversely i'fherfeo,ffgf'and.v `being-norrnally coveredfbyf Said bore,,saidtube-` at; its .place-of juncture-withA said rack havingyapassageway whereby fuel mayfflow therethrough to :an- `area in direct communication-.with the; firstof. said jets `and in direct :communication ,with

= others of said jets upon withdrawalfromgvqsaid l bore, means to conduct fuel tosaidftubula'rfhousf ing, vmeans to conduct fuel fromsaid jetset the Y throat cfa Venturi Itube in said; carbureto .for v admixture with air; mamans' tofectuat; eid` cylindrical-rack. EARL. E CKENBER

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