US1788914A - Carburetor - Google Patents

Description

Jan. 13, 1931. A J HAMLlN v 1,788,914

CARBURETOR Filed Aug. 2o, 19,28 2 sheets-sheet -:L

ATTORNEY.

Jan. 13, 1931. A. .1. HAMLIN l 1,788,914

I CARBURETOR Filed Aug. 20, 1928 2 Sheets- Sheet 2 Fzjv.

INVENTOR. LFRED t HAMA/N.

A TTORNEY mmm 'Patented Jan;4 13, 1931 f UNITED y-sfleafrrf'zs' 1 ALFRED J'. HAMLIN, Orl-Ventron, enmroniiin, ns'sieNon `'ro .Manni LosnNGnLEsoAmroRNiA si, yiinivitiiv, 'or

' CARBURETOR Application mednagustfeo, 11928. serial No. 300337;

vrlyhis linventiongas engines.V

. One Vof the objects lofthe invention is tcprovide `a'ca'rlouretor which will enable a gas j engine to attain a :higher running speed.

relates to carburetors for Another object 4of Vthe invention is to provide ka Carburetor by 'means of which 'smoother running of a gasengine in any gear and at any speed is 'effected l 1 Y: A 1U Another .ob'ect is lto providea carburetor which will enable a gas yengine to '.piek up"V or start more quickly.v 1

Another object. is to provideV a carburetor which will function in such manner as to 15 prevent killing or stalling of the engine. Another obJectis to provide a carburetor in which a variable idling jet is regulated by the engine choke. .Ag furtherobject-iswt-o provide a carburetor of the character stated 20 by means of Vwhich higher eiiiciency ano greater economy' is attained. j v

Otherobjects and advantages will appear hereinafter. E

y The inventionis illustrated the an` annexed drawingswhichforr'n a part'of this specification and inwhlchf.

Fig. 1 is a side elevation of Fig. `8 isY a' fragmentary side viewiogtv the' t;arb'ureto'rand the vchoke conn'eetions'to the' main air intake valveoperating arm :andthe Yidling jet operating arm. e VFig. 9 is a fragmentary transversejvertivcal section of the carburetor taken on line 9-.9

of Fig. 5" showing the main air intake valve and the auxiliary airV intake valve. i

" Fig.. 10 is `a horizontal ,section of. the; idling l*regulatingftheadmission of air intothe'jet.

the carburetor.`r Fig.' 2-is a sidefelevationioffthe carburetor v'taken from the side opposite to that shown in Y 30 Fig. l. v Y

upper end of the tube 14 'in the mixing cham- -jet'taken on line 10-10of Fig.' `showing the jet valve operating arin. y y f Corresponding reference characters refer f' to the .same parts throughoutythe several views. Y 5' *My carburetor eomprises'generally a iloat chamber 1, an idling jet 2, a mixing chainher `3, a main air intake valve 4 and anaux` ilia-ryrgair intake .Valvefin the lfront-end of' said mixingv hambfer, a main ,gas jet 6 in said mixing chamber,.a main jet; regulating valve 7, `a weighted mixture/,outlet valve 8 in said l:mixing chamberra butterfly throttle valve 9 the mixing ehamber outlet 10', and a. kick-out. valve 11 controllingjan opening 12 inthe rear Iend of the mixing chamber.

The float Chamberl is providedwith an Vin-let 13 which connects with the gasoline supplylnotshownym The idling jet 2 fof myflcarburetor is of 70y vspecial design land construction, comprising generally a pair of aligned-jetf tubes 14 and 15j, barrel 16 into whichthe ends'of said Itubes extend,V and an idlerjet valvev 17 vfor The tubeMV extends upwardlyV from a point y near the bottom ofl the ioatchamber through the topV of the chamber and through thelower f i end wall 18-of the barrel intoa mixing chamber 19 infthe lower rend ofthe barrel. The lower endof the tube lext'ends downwardly vrthroug'rh a" threaded bore' 20 inthe upper end of the barreljl-into the mixing chamber. 19

andsaidtubehas a thread 21 whichv engages Vthe thread of said threaded bore,v so that uponV 'l turning said' barrel in one direction ori-the .v other,the tube 15 will be moved axially in the barrel` whereby the lower end of the tube will Y be adjusted closer to yQrffurther from the 9e ber, as conditions require Vforvarying-the gas niixture. Alock nut'22 screws on the upper tube thread 21 against'the upper end of the barrel'for lockingthe tubeadjusted in the barrel. j The bore ofthe tubev 141is restricted 95 at itsupper end at 23 and the bore of the tube 15 is restricted jat its lower en d at 24. The barrel 16 is provided with air inlets 25 ,lead-` ing .intothe mixing chamberl). V.The valve l? comprises a sleeve26`turnablyfitted ir-rthV .109

sog-V lower end of the barrel and provided with air v inlet ports 27, whichports correspond in diameter at one endto the diameter of thev barrelinlets 25, as indicated at 28, and taper from said end to points attheir other ends, as indieatedat 29, fo-r varyingk the admission of air therethroughand through the inlets into the mixing chamber 19. 'An operatingv arm ,is adjustably clamped on thevalve sleeve 26 by^means ofY a clamp 31V yformedl on one end of the arm. The tube l5 leads into the carburetor outlet 10 above the closed posi@ Ytion of the throttle valve 4 as indicated at 32.A

In the mixing chamber 3 area seriesfof baille plates-33, 34, 35, 36, 37 and 38-spaced progressively from the front end of the mixing chamber toward the rear end thereof, the rearmostplate 38 being spaced a short distance forwardly of theV rearY end wall'Y of the chamber forming the rear portion of anoutlet passage 39 between the plate and said wall. Theibaflle plates 33 to 38 inclusive Vextend entirely across the mixing chamber and upwardly from the bottom` thereof to a horizontal wall 40 which is vspaced below'the top wall ofthe Chamberzandforms'the remaining portion of the outlet passage 39, leading fromA the rear portion ofthe passagetothe throttle outlet l0. Afvertical partition 4l extends longitudinally `of the mixing chamber midway thereof from the front end -wall of the Vchamber tothe first baille plate 33 and from the bottom olf-the chamber to the top thereof, the upper portion 'of the rear edge 42 of said partition extending atan angle of` (45) up- I wardly from the first baille plate 33toithe substantially forty-five degrees intersection of the f front' wall- Vof the Vmixing chamber and the wall v40. l The partition 4() divides the .front end of the mixing chamber forwardly of thelirst baille plate 33 Vinto a main air' and-gas intakeehamber V43 and an v auxiliary air Vintakechamber 44, the main gas jet 6 being located in the chamber 43 and the valves 4 and 5 controlling ` air Vinlets 45 and 46 in the front wall Vvof. the mixing chamv ber leading into saidV chamber '43 vand 44 re! spectively. The lowerhalfl'ofthebaffle plate 33 i'ssolid v'while .theV upper halflthereof is perforated with openings-47 The upper half v'of the baille plate 34 is solid-while the lower half thereof is fperforatedwith openings 48v slightly smallerrthan the openings`47 lin the baiiie plate 33;Y The lower half ofthe baffle plate35 is 'solidwhile'f the upper half thereof is perforated with openings 49 slightly larger than the `openings48; The upper half'of the baille plateV 36 yis solid while the-lowerzhalf thereofis perforated with openings 50 slightly Vlarger than Vthe openings 49. 'The lower half of the baflle plate` 37fisfsolid; whilefthe' f upper half thereof is perforatedwith openings 5'1, slightlylarger than the openings 50. The baffle plate'38 issolidrland extends Aapproximatelyro'nly half 'the' distance fro-mfthe upper wall 40 to the bottom of themixing chamber 3, leaving an outlet 52- between the lower edge of the plate and the bottom of the mixing chamber, which outlet is normally closed by the weighted mixture valve 8, which is hinged at its lower edge at 53 in the lower rear corner of the mixing vchamber 3 and carries a weight 54 which normally holds the kvalve closed with its upper end againstva seat V55.on the lower edge of the bathe plate 38, but said valve is opened by the suction of the engine.

The main jet 6 `comprises a tube formed wlth a vertical-valve member 56, a horizontal member 57 extending from said vertical member intermediateits ends and a jet mem? ber 58 extending upwardly from the end ofV said horizontal member, said jet'member vbe- 'through the adjoining walls of rthe float chamber and the mixing chamber 3, withy the jetj6 centrally disposed-in the gas and air chamber43 and immediately below the center of the cholretube 60 which is 'secured in the gas and air intake-chamber. The valve member 56 is formedwitha valve'seat 56 immediately below the horizontal member 57 and anscrew valve 61 is threaded in the valve member 56 tofengagethe seat 6l for regulating the flow of gasoline from the float chamber through theV j et 6 and the choke tube 60 into the mixing chamber, the upper end Vof the screw valve extending .through the top of the Lfloat chamber whereit may be engaged by a screw driver for regulating the Valve. Y f The-Jet',regulat1ngvalve7 comprises a stem 62,/avalve head63 .on the lower end of the stem, a.Y valve tube 64, headsv 65 and 66 in the lower and upper ends respectively of the tube, a'collar 67 on the stem, and a spring 68 surrounding the stem.` The `stem 62 ex `vtends through the tube 64 and the-heads 65 and66,`whi le the upper end ofthe'tub`e64 is screw-seated at 69v inthe upper `wallzof the mixing chamber` and the base iange 7 O'of the throttle. outlet casting in axial alignment with the j et member 58.".V The spring 68 is interposedbetween the lower head )65 of the tube and the collar 67 andnormally holds the stein 62 and valve head 63 elevated with said head above the jet seat 59, so that gasoline lili) may beA introduced through the jet linto theY mixing chamber. Y l Y v v YMeans 7l are provided for closing the gas .jjet'6 when the vthrottle' valve 9 is closed, which means comprises a-lever 72 'hinged at 73 to the Vthrottle outlet casting, andan arm 74 secured on oneend of the throttle valve shaft e 75 Yand formed with a cam 76 vfor engaging liz-emi@ Y* .,.saidilenen Oneendof theqleY-.er 72... bent bent. end.- YforE engaging .the .upper -end Qfsad .-stemvwhen the. leve- P17 2.-.`s Swungdfwnbyfthe engagement thereof by thefcam.Tffwhena the A dnwm; aga-instthetenSiQn Q-fxthe sli-.ring1 68,

:until the'valveheadr 63 see-te .0n t.. .59).ausili'Closes:*sadiet4 A. Set S52 Je .seat .79 iS seated.- in the-Guten end; .Oi the arm 74:; f0.1" engaging the throttle outlet 'liagigef-'L0 for Y limiting the @being .Qf/ the-fthottle #able A9- lary-j. am mieke-valve @are fiat. velve .hmeled swunglformrdly they 5111.desethe-alrlntak The air intakefvelvelind.the auxilat their; 19ml: ende reenatively en' Sheffs@ iacent'theimm.andlowenwallslf.themx# ngf Chambon, so that` when;k said valves are f when swungibeC-kmdly- .All 31.82 saeesuned @Mlle Outer.emlfQf-'thevalte Shaft' 8.9;;199 Awhich arm a isncenneted .,tliechok; rod 8.3.11; e Stud .Sefproiects from-911e Side-.edged dosed-when; the alte 4i GlQSlz liu-tl the vallvee may be Openedwthout openmgrtxe valve end ofsaid spring;`v ngagee th. fen-189. The

A .Thek-ick-ont valveopening 12 isgjoi-.ovded leven et andsaidf atbet iis engage bf Seid' lenen to hol r;l..theE leven in. dijerentg p Vwherelogythe.EenS1011 of the spring, Sil-:throngh oam89'lis {faniedto vaify-.the ieSSla-alleeatv thsuction ofthe-engine. y

whielthe auxiliary ainvalYe 5i is; opened; by

outside 'ofthe 'near enclfwallfoftlie mixing chamber 3.. Said; me. is @tmf-11m heid. lGlQSelby spifllgk 9.5 which is; Coliictd. at

1 elle endfQ-,the-upipe1 part Of tali@ filndgat itS ether endtothe,baeflange'l 0f. tllstbmta @emblema-ing.;

for; Opening and'.c1osr1gftl1e.L throttevelye..

link` 9.8 tothefchoke-rod'8.31; whereby the n-mportant .fatureofmy invent-ion is 'the ConneQQn; of. the. idling jet' valve-@paf ating arm 30, by any suitablemeansuch yas, a

is operatedgto close thelmain,intakel valve 4:

to introduce a ieh primingchargefinto-the engine manifold t-hroughfthe'idling jet' and jet{aube-15,L i I The-'operation of myfcjanburetor: is es Vf0.1-

IOWS: ASSumng'thethrot-tle. valveQ-tQfQbe closed. and: the. main. jet 6 Closedl byfthejet valyel 63,11pon pullingout lthe 'choke5 the `main all@` Valve'. u41's. swung open Vby Ythe. ohoker'od Sandthe-.nalve-QG isturned also by'thecfhoke md, 'throughY theA .link 9.8, `so kthat. saldi valve4 If. the throttle .valveisleftalosel, the

will be. mixed inthemXng'ChambexB'or pass therefrom; but: air wlllbetaken into thegd'lng jet thnough. valve; inlet. ponts 29..:and. jet n- Chamber-- :Thegae passingfifomjthe float chamber through thedling iet? aridE itsgtube 15; and; through. thecarbunetoroutlet. 1.0.; into the'. engne-c-y1i11dene..wllsvstat' and. mm. the engine.r By regulatingthe jet .Vaale 2.6." by mea-ns of the choke, so that jet inlets 25,. Will be Completely.; oitpartly openefLby-the val nablevalvefnletporlts 29, .themiXtu-pe 'of-gas fedinto the, engi-neand the speed, of tlieenj gine. will aocording'lybe varied; 'lfh'epuri-v .olrgaseieeffeoted in. the mixingfhamber of is.: possible by means offtfhe thread@ Cl.- engagemehtfoi'? the ll'alrel lttafllfd tuloe4 ChokeJ is; eleased'falicl the engine started, the Gana., "7 6; W1-ll lleleese l Leyen 72,. and the Splimg 58..v Q: till@ lllll glfS.. ]e.t rValve willv raise the -jetvalve head 63. ofi-.its .Sea-.t faildfOPefi-e jet, wheeupen gasoline-will be, @lm-.Wn by @he emotion, of the engine-,fromme float chamber.

'.thrQilgllf. the iet.; into the. air intake' chamber 43, While airWill beirawnthyoiighvtlieman 7 'aire-intake Qneemg paeiat-.hepnnlein .air Y intake. table 4,. into; Seidleininfke chamber and the gaselllef en@ aewillmeand nass 'filttlef-Ouzglthe @helle t 10,860 then through web.

.the space between said'baiile plate-and 'bathe plate 3.4; then downwardly through said space and throughthe perforations 48 in baiiie plate 34, into the space betweenbaflle plates 3e and 35; then upwardly in said space and through the openings 49 inthe plate 35, into the space betweeiithel baiile'fplates `and 36;V then downwardly through said` space and through fil) the openings 50.inthe batle plate 36, into the space betweenV the baffle plates 36 and `37;

then upwardly in said space and through the openings 51 in baffle plate 37, into the space between the' battle plates 37 and 38; `then downwardly in saidspace thrbughthe outlet 52, (the valve 8 being drawn open by the suction :ofthe engine) andout through outlet passage 39f-and the carburetor outlet 10 into the enginefor driving the engine v'in thev usual mannerwiththe throttle open. As the engine speeds upthe auxiliary air valve 5 is opened by the greater suction'of thefengine and an' additional amount-of air passes first through the auxilialryarrintake chamber L14 arid=mixe`s withthe gas behind the inclined frear ed'ge'ofthe' partitionand then passes Vthrough the openings 47 tof-5l and between the baiiie platesas above described andinixes with the gas drawn'v through the V,mixing chamberfas above described. Thegasin-circulating between the baffle plates 33 and 34,

34" and 35, 3,5Yand 36,' 36and 37,37 and 38,

and passing throughthe progressively smaller openings 4:7 to ,5l-inclusive' in :saidbafle plates, is sothoroughly and finely mixed-as to'effectv most perfect and'complete combuster with the gasoline; atdi'erent levels inthe.

float Vchamber 1, I have provided means for regulating the level of the gasoline inthe .float chamber to accommodate the requirements 'of the engine. y I

To the floatV 100 of the fioat-l chamber-1 connectedan arm 101 whichis pivoted' at l102` tothe upper'end of-a screw 103 whichex' tendsV through the lower wall Y of the float chamber in threaded engagement` therewith.

To the outer end of the arm jlOl is pivoteda needle valve 1, whicli slides intheiipper inner end of the inlet tube 13 of the chamber and is adapted toopen and closeports 105 y and to engage a seatVV 106 in said tube and Vshut o the inflowof gasoline when it reaches a .predetermined level-,in the chamberV as adjusted by the screw-103. s s

Having described my invention I claim;

y 1. In acarburetor, a mixing chamber provi ded withan airintakeopening and'anoutlet7 an air intake valve controlling said opening, a'plurality of baffle plates spaced between the front and rear endv walls of the Vmixing chambenls'aid bafflev plates, exceptvthat `one nearthe rear end of the mixing chamber, beingl perforated, the perforations decreasi'ngxprogressively-in size` in the Vplates as spaced fromthe front towards the'rearbf themixing chamber, said mixing chamber fromthe space between the two rearmost baflleplates, to the carburetor outlet, and fa fuel nozzle in the Space between the front end wall of the mixing chamber and the first baille'plate. f A i Y,

`2. In a carburetor, armixing chamber provided withan air intake opening andan outv let, an airintake' valve controlling'said opening, a vlfnluralityof baffle plates spaced between .Y the front andrear endwalls'of the mixing cliambersaid'bailleplates, except that one nearthe rear end of the mixing chamber,

beingperforated, the .perforations' decreas- 'being formed with an outlet passage leading Y ino progressively `insize in the 'plates as Y spaced vfromjthe vfront 'towards the rear of the s mixing "chamber, said mixing chamber V'being formed 'with'an outlet'passage leading from the space between the v'two' rearmost baille plates, to the*carburetorV outlet,av mixtu'i'egcontrol valvev in said passage normally closed-but capable'o'f being opened by the suction ofthe engineyand a fuelv nozzle inthe spacebetween'thev front end wall of the mixing chamber and the first baille plate.v

' 3.1 InV a carburetor, a mixing chamber provided with a main'air intake opening andan auxiliary air intake opening in the-'front end'- ywall of said mixing chamber,'a mainA air intake valve 'controlling said main airiintake opening, an auxiliary intake valve controlling 1 said auxiliary intake opening, a plurality of baiile plates spaced betweenthe front and rear endrwall's of the mixing chamber,

said bailleplates,A except that'l :one nea-r4 the: VrearV end of *the*v mixing chamber,

' being Y perforated, the perforations decreasingprogressively in size in the plates as j spaced from'the front towards the rear ofthe mixing'chamber, a partition 'extending from thel front wall of lthe `mixing chamber .to the air intake chamber into which said mainair "intake opening andsaidl auxiliary ,air intake opening lead,"said mixing chamber being formed with ran joutlet passage leading from `the space between the-two rearmostbaifle plates to the carburetor outlet, andv a fuel nozzle in the mainair'intake chamber.

Q4. a carburetor@ mixing chamber proi' vided with an air intake openingv and an outlet, lan 'airi intake valve controlling said opening, fa plurality of balfle plates' vspaced :first baffle plate and dividing the spaceinto ay main'V air intake .chamber andan auxiliary between the front and rear endl walls of the l` mixing chamber, said baffle plates, except that vone near the` rear end of themixing chamber, being perforated, the perforations decreasing progressively in size in theV platesjas spaced from the front towards the rear of the mixing chamber, said mixing chamber being formed with an outlet passage leading from the space between the two rearmost baiie plates to the carburetor outlet, a mixture control valve' in' saidpassage normally closed but capable of being opened bythe suction vof the engine, and a fuel nozzle in the space between the frontv end wall of the mixing chamber and the first ba-ile plate, and alickout valve in said passage betweenv said mixture Vvalve and the carburetor outlet.

5. In a carburetor, a mixing chamber, a main air intakevalve and a hlnged auxlliary air valve, forl controlling the admission ofl air into said mixing chamber, a throttle valve Y for controlling the outlet of mixture from said mixing chamber, and means for adjusting the resistance `against opening of said auxiliary air intake valve, said` resistance adjusting means comprising a lever, a cam on said lever, a flat spring connected to the pivot of said hinged auxiliary valve and engaging said cam, anda ratchet to be engage by said'lever to hold the'same and said cam in dierent positions to adjust the tension of said spring. s f

6. In a carburetor, a ioat chamber, a mixing chamber provided with 'an outlet, an Y idlingV bypass including a bypass mixing chamber, a tubeextending from said iloat chamber into said bypass mixing chamber,

a second .tube extending from said bypass mixing chamber to the carburetor outlet, means for adjusting the adjacent ends of said tubes closer together or. further apart within said bypass mixing chamber, and means operated by the choke for admitting air into said bypass mixing chamber.

ALFRED J. HAMLIN.

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