US1222130A - Carbureter. - Google Patents

Description

C L. RAYHELD.

CARBURETER.

APPLICATION 11w) M1613. 1942.

Patented Apr. 10, 1917.

4 aHEETS-SHEET I C. L. RMHELEL (IARBURETER.

AFPLICM'IGN man wax-2.19:2.

1,222, 130. Patented Apr. 10,1917.

4 SHEETS--SHEET 2.

The

C. L. RAYFIELDI SARBUHETER.

APPLICATION FILED AUG-2E. Hi2.

Patented Apr. 10, 19W.-

4 SHEETS-SHEET 3.

C. L. RAYFIELD.

CARBURETER.

AEPLIGATION min AUG-23 Patented Apr. 10, 1917.

4 SHEETS-SHEET 4.

'. .yvithsaid'air ff(e'ither integrally therewith or otherwise) to' feed chamber in its normal adjustment with reference to the carbureting apparatus.

Fig. 2 is a section on line 2-2 of Fig. 1, and showing the throttle and needle'valve open.

Fig. 3 is a top plan view thereof.

Fig. 4 is a section online 44 of .Fig. 2. F Fig. 5 is a section taken on line 55 of ig. 6 is a section on line 6-6 of Fig. 2,

with parts omitted.

Fig. 7 is a detail section of the automatic adjusting cam taken on line 7-7 of Fig. 2.

F 1g. 8 is an enlarged, sectional detail illustratin the connection between the float feed cha-m er and the hydro-carbon supply pipe from the tank.

Figs. 9 and 10 are top plan views of the carbureter embodying my invention, illustrating in full and in dotted lines. various adjustments, both right and left, to accommodate the carburetor to the best requirements for installation in restricted spaces.

As shown in the drawin s:

The carbureting mechanism, comprising a casing containing a mixing chamber, me chanically operated needle valve, and throttle and air inlet valves, is adjustably connected with a float feed chamber to supply the fluid hydro-carbon thereto. 1, forthe carbureting mechanism is cast or otherwise constructed to afford a ,substantially vertical cylindric bore and said casing is extended downwardly be ow said bore to afford a tubular cylindric boss 2, having apertures openin through the sides thereof I and adapted toa 0rd connection with a float the carbureter, and 0 ening horizontally outward t .feed chamber as hereinafter de sdlfimd;

Extending upwardly and axially in said bore from within said tubular boss, is a hydro-carb'on jet ipe 3, the jet aperture of upwardlyin position to be justable in said bore. Said vertical bore in said casing affords the mixing chamber for substantially erefrom is a lower ori'nlet passage or port 5, the axis of which extends nearthe'or fice in said jet nozzle shown, a pipe connection 6, concentric port, is provided on said casing permit of connecting therewith an air suph h conditions. As shown, the bottom of sat there concentric with lies; slightly below said airlport 5, to'permit th faccnmulation of a-s'ma "1h rocarbo'n in the bottom e amber, and, as

pi e, which may leadfrom closely adja- 5 ce'nt t e cylinders or other location where the"t en1p'erature' of the air is, sufliciently assist-in the carburetion under runthe spray nozzle,

quantity of the of the mixing shown also, a dam or bridge wall..7-, is provided in-said air port to permit a. small quantity of, the hydro-carbon The casing.

12. Sli closure fluid lying in the bottom of said air port or passage, so thatthe inflowing air will be drawn thereover'.

'The upper end of said vertical bore affording the mixing chamber, as before described,

9, which is extended at each side thereof and provided with a bolt aperture .to permit of 'being rigidly secured in communication with the manifold of the engine.

Extending rearwardly from said casing and substantially in axial. alinement with the throttle port or passage 8, connected with the manifold pipe, is the automatic inlet passage or port 10, as shown of relatively large size, and comprising, as shown, an externall threaded tubular boss communicating as before described, in. the upper end of sald bore in said casing, and on which is threaded-a cylindric sleeve 11, having an integral and centrally apertured head 12, at its outei'end. The aperture in said head 12, is relatively large and circular, and the edges of the head at the inner side thereof are beveled inwardly to afford a valve seat. Closing said vertical bore of the mixing chamber at its upper end is a sip or head 13, which is secured in place by ans of screws which extend therethrough and .into the body of the-. casing.- Said head is provided with an axial bore therethrough and has pipe leading to the cylinders connected therewith on the upper and the lower side respectively,

an upwardly extending sleeve '14, and an matic air inlet port or-passage and extendsoutwardliy through the-a erture in thehead- 0, complemental' with. the. valve seat in Said d and adapted to close thereon, and secured on said closure 20, at itsinner is. a relatiyelyweak i to yieldingly the u I ably engaged t ereon is avalve stem and adapted to'. bear against said hub21, on said closure and against said collarafter the-valve closure springs to vary the resistance thereof, is wetogether with said strong coil spring 522, to resist further opening beyond the limit of such initial opening.

The adjustment of the tension of said coinplished by threa-iding the sleeve 11, i1 wardl'y or outwardly, thus adjusting the clean-e20, on the stem particularly to vary the resistance of the weak spring 23. An integral arm 2%, is provideiil on the cap or head affording the closure for the upper end 'of'the mixing chamber, and a. suitable here is provided in the under side of said arm to receive therein a detent 25, and spring 26, whereby said detent is held downwardly in engagement with the periphery of the sleeve, which is longitudinally fluted, as shown in Fig. 1, to afford engz'igeincnt for said detent at any of the adjusted positions for said sleeve.

A. shaft 27, extends through the throttle passage 8, and air passage 5, before descrihed,'and substantially parallel with the axis of the mixing chamber, and secured thereon in the throttle passage, is a butterfly valve closure 2-8, adapted to control said passage, and secured on aid shaft in said, air passage,-is a butterfly valve 29, which is sufficiently smaller than said passage to per 0 Init air inlet around said butterfly valve closure.

When the throttle valve is closed, con venientiy (though. not necessarily) said closures 28 and 29 are arranged'on the shaft iifsubstantially the same plane, and the air valve closure 29, is sufficiently smaller than the air passage to permit a clearance be tween the tllIQOgf and the walls of the passage, of a small fraction of an inch to insure an air supply at all times for the lowest possible de ree of opening of the throttle. As shown a so, such clearance is indicated by slightly cutting a way the lower edge of said closure to afford a slightly greater clearance at the bottom, so that infiovvinp air drawn over thebridge wall 7, and beneath said edge is drawn through. any of the liydro-carboi-i. liquid. that may be in the bottom of sa-id'air passage, thereby agitating such liquid and assi stingin the, carhuretion of the air. Seenred on the upper end of said shaft 27, is ath-rottle lever 30, for operating said valves, and means are also-secured on said.

, shaft and operated by said lever therewith to adjust the needle valve proportionately to the degreeof openingof the throttle to supplythe requisite amount of the hydlo carbon fonthe running conditions of the fiengine and its throttleadjustment. For this 69 purpose, as shown, a block 31, is secured on said shaft'and is providedwith a transverse bore therethrough, shown in Figs. 6 and "(yandthreziddthrou" sardine and lying in a recess or notch in saidshait 27, isa

screw shaft 32, the ends of which are rotatahl y engaged in the parallel arms 33 and 34, of a. cam 35, theouter or cam faces of which lie at substantially a right angle with calls other and are connected by a curved or rounded surface at the apex.

Said block 55], is 'abbetcd to receive the inner edge of said 11am member to permit the same to slide on said block, as shown in I hold the cam normally in adjustment or-prerents the varying of ihe adjustment through any vibration to .wlich the parts may be subjected, thereby lockiugthe cam in its adj ustn'ient,

The stern of the n edle valve provided near its lower end with a collar 38, and a spring 3 shown as a coiled spring, hours at its lo 1' end ag'a inst said collar and at the lower end of the sleeve 15 and acts to hold said needle valve closure normally seated. Connections are aii'ordcd between said cam 35, and said needle valve stem to open the needle valve 1311 |)()ll1l0Illlll Y 'with the adjustment of the throttle and also to open or raise the same, as desired, for the {it"ilgial starting ot' the engine. 5

For this purpose, a; shower; the upper end oi said step: is longiti din-ally bored and for at least a part of its length, screw threaded at its upper end, as shown in Fig. 2, and a longitudinal slot provided through said stein iuto'said bore. 'lhreadedin the bore of said stein isa set screw 40, having a milled head 41, at ;he upper end thereof for manual engagement, and secured at the inner end of saidset s rew and at the axis of the bore in said stem, is an anti-friction hall -4l, \vhich at all times upon one of the arms 42, of it bent (fr U shapul lever, the other arm 43, otwhicli is englged by the arm 44, of a hent lever, which is fulcrumed on the head 13, and the other arm 45, of which extends fUTWtl ally and hears against the outer face of 'saidjcam, so that the set screw 40, having been properly adjusted, ro-

tation of the throttle shaft 27, by its lever,

actuutes the needle v ilve, closure to lift the same with the opening; of the throttle and to close the same W:th the closing of the throttle.

Secured on the upper end of thetiieedle valve stem, is a retard, extendi g. rear rand rear vltia slide aperture there ,irin :1 at its up wardly there-tron end provided through, ll the otherle'nd of which "extend :wire 4 7 vvhr :h' 155 connected, w th't' crank 48, secured on the head 41, of the friction, the other or outwardly directed set screw 40. In starting the engine from yoked end being also provided ,with V a state of rest, it is desirable to flood the shaped,-upwardly directed ribs 66, and encarbureter, and for this purpose the operagages b neath a nut 67, threaded on said v tor, .by means of said wire, may rotate the stem, an which may be held in rigid and setscrew 40, sufliciently to thread the same permane t adjustment by a jam nut 68, inwardly for a part of one revolution, there-. threaded hereagainst. by lifting the needle valve closure on the A suitable air inlet ortor assage 69, arm 42, of said lever and permitting the is provided through sai head to ermit hydro-carbon fluid to flow into the. mixing the inflow of air with the outflow of t e hychamber. Of course, when the engine is dro-carbon fluid to the mixing chamber. started, the screw shaft is returned to nor- Mounted adjustably upon said head 58, is a mal adjustment by means of said wire 47. bracket 70, upon which is fulcrumed a lever The float feed chamber comprises a casing 71, which engages beneath the head of the, constructed ofcast metal or in any suitable stem 59, as shown in rig. 2, and is provided manner and material, having a removable with one arm 72, adapted for manual encap or head 49. The casing of the float feed gagement to permit said needle valveto be chamber is extended at its bottom to afford raised in flooding the carbureter, andgno upper and lower, parallel walls 50 and 51, vided with an arm 73, normally presse by 20 which are apertured to fit on the cylindric a spring 74, carried on said bracket, and g5 boss 2, at the lower end of the mixing cham: which holds said lever normally out of her, as shown in Fig. 2. Metallic or other action. suitable packing washers 52 and 53, are en- As shown, a tubular boss75, is provided gaged on said boss to pack the joints aflordintegral with the floor or bottom of the float 5 ed at the connection of said boss therefeed chamber, and apertured therethrough through, anda screw plug 54, is inserted to to communicate 4 therein and closed by a close the lower end of'said tubular boss afscrew plug 76; The removal of said screw -fording a art of the communication beplug permits the float feed chamber to be tween the oat feed chamber and the mixdrained at any time for the removal. of 30 ing chamber: water or dirt.

A cylindric stem 55, is extended through Tlie operation is as follows: In installing "the cap 49, of the float feed chamber, and the arbureter, the float feed chamber may threaded into the bottom thereof and slid; be ranged as shown in Figs. 1, 2 and 3; able'on said stem in said chamber, the that is to say, substantiall in alinement 35 feed float 56, which may be constructed of with the throttle passage an air inlet ports, an buoyant substance 'or may be a thin or," if desired, or the requirements-ofv the ho ow sheet metal float, as preferred. As 'a-jfailable space render it necessary, the

shown, a vertical passage or bore is rorew plu 5-1, may be loosened slightly and vided in the-casing at one side of the oafiie float chamber swung either to the '40 feed chamber'in alinement with the pip right or left with reference to the mixing connection 57!, whereby the line pipe 57, chamber, .as shown in Figs. 9 and 10, it' befrom the tank iseonnected therein. .Said ing possible, as shown in dotted lines" in?" pipe connection 57', discharges into saidver- Figs. 9 and 10, to adjust the float feed chamtical passage through, a restricted opening her through an angle 015180 degrees,'sh'own 45 or passagle and the metalsurrounding the in Figs, 1 "to 3 inclusive, and of course, to

same is aped to afiord a valve seat. any positionv intermediate said extreme posi- Threaded in the u per -end'of said pastions.

sage is a closure or ead 58 }liaving a min The screw plug 54, is again set-up after tral bore therethrough, and 'slidably' extendthe adjustment is efiected, rigidly engaging .50ing therethrough is a stem 59, thelower end the float feed chamber with the carbureting 1'15 60,01 which is tapered to close the aperture chamber. The bracket' 70, is also rotatably in'said ipe fitting 56, .afiording a. needle adjusted upon the plug- 58, fornthe 'floa't' valve. nut 6 1, is threaded on said stem feed needle valve so'that whatever the adand a weak sgrihgfiQ, bears at its'up er end justment of the float feed mechanism, rela- 55 against the. ead orjcl'osure' 58, an at-its tively to the carbureti'ng mechanism, the lower end. bears against said nut and acts lever arm 72, may be ro rly directed to tohold thevneedle valve normally seated. L be '0 erated from thedasg by'm'eans of a. .yElllGl'U-Hlfid .upon a ,intle -63, extending. suita- 1e connectionn'otshown', for example, transversely between t c axis of the float a lwire similar to the wire-'47, before ,de- 6,0 feed chamber and said. needle valve stem, is sc'ribemxwhich may be hooked in the-aper} alever 64, yoked at eachJend,-bne of the .ture in said arm..

Y yoked ends thereoffreceiving'fthe steln -55 1 therein, cat which the float 56, slides,

In adjusting the carbureter, a';; ;..a '..'av mentor theneedle valve is by means yprovided w thnpwardly directed-transverse pftheset'screwaqtomeet"the'reqli m -i,

that is to say, when the engine shaft is barely turnin .vanced for maximum speed. This brings the lever end45, into bearing on the other straight side of said cam, and the cam is adjusted by means of its screw shaft 32, varying. the throw of the lever, and, of course, varying the opening of the needle valve by means of said cam lever until the en ine operates perfectly and without back fir ng or missing at such high rate. At the same time, of course, the automatically controlled air valve may be adjustedto supply the requisite air supply a over the requirements at the low running position.

Having secured a satisfactory. adjustment for. maximum speed, the shape of the cam is such that the throttle may be shifted from full openposition to any intermediate position, with the efiect of proportionately reducing ,or increasing the supply of the h dro-carbon liquid. Inasmuch also, as the a1r valve 29, is'secured on the same shaft with the throttle valve, the airsu iply is likewise varied simultaneously. to tie best running conditions for the engine at whatsoever speed it be operated.

Of course, beforethe ad ustment of the valves, as before described, the float is set to permit the float feed needle valve to close under the action of its spring, and the buoyancy of the liquid in said chamber, when the level of the liquid in said chamber is just below the orifice of the nozzle 3. This adjustment, however, is very easily effected by means of the nuts ()7 and ($8, and having once been adjusted, for oxaiiiple, atthc factory, need not be further disturbed..-

Should it be required to flood the carbureter, the lever arm,72,is actuated in any suitable manner to raise the stem 5%), opening said needle valve, and holding the same open independently of the position of the float until the desired amount of gasolene or other hydrocarbon fluid has flowed into said chainher. Of course, an adjustment of the set sciew 40,-by means of the rod 47, is effected at the-same time, permitting the excess gasolene to flow into the mixing chamber. When said rods are released, theparts return immediately to normal adjustment and; the operation is as before described.

I claim as my invention:

1. A carbur'eter of the class do. "ribed embracing an upright mixing chambt and automatically and mechanically contimlledlaterally directed air inlet ports communicating therein, a float feed chamber adjustably and eccentrically :onnected therewith, and

communicating therein, and a needle valve controlling the communication between the same.

Q. A carbureter embracing a mixing chamber, a mechanically adjustable needle valve tl1erein,'an upper throttle valve, a lower air inletv valve, a shaft to which both are secured to operate the same simultaneously, connections between the '1lll'0ttl6 valve and the needle valve acting 20 open said needle .valve proportionately with the degree of opening of the throttle valve and air valve, an automatic air inlet valve mounted in an inlet to said mixing chamber ,alined with the passage controlled by said tthrottle valve, and a float feed chamber eccentrically, adjustably and scalingly conncctul to said mixing chamber to admit fuel to said needle valve.

3. A carburete r embracing an upright mixing chaml'ier, a float'feed source of hydro-carbon Suppl; opening through the bot tom thereof and adjustably and ecccntrically connected thcrew .th, a needle valve controlling the same,-a throttle shaft journalcd parallel the axis of the mixing chambcr, a throt-. tle valve scoured thereon near the top of the mixing chamber, all air valve below the throttle valve and above the bottom of the mixing chamber, a lever for operating said valves simultaneously, operative connections for opening sait. needle valve proportioir ately with the owning ot' the throttle and air inlet valves, and an automatic air. inlet valve arranged substantially in alincment with the throttle valvc.

l. A device of the class described e1n.

bracing avertical mixing chamber, a float fccd chamber c centrically and .adjustably connected therein, a-necdlc valve positioned togcontrol said source of supply, a throttle valve and an air valvc rigidly connected togcther, connections between the throttle valve and needle valve, and a single lever connected to siniultai'ieously open the throt tle, the air valve, and the needle valve p'roportionatcly. I

In testimony whereof I have hereunto subscribed my. name in the presence of two subscribing witnessas.

. -CH ARLES L. RAYFIELD. Witnesses:

CHARLES 'W. HiLLs, J r., Gnoaor. B. Moore.

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