US1173246A - Carbureter. - Google Patents

Description

A. H. BOETTCHER.

CARBUHETER. Y APPucYATfoN FILED JAN. 29, :912.

Patente Feb. 29, 1916.

.ARTHUR H. BOEITCLIER, OF

CHICAGO, ILLINOIS, ASSIGNOR TO STROMERG MOTOR DEVICES COMPANY, 0F CHICAGO, ILLINOIS, ACORPOBATION 0F ILLINOIS.

caminantes.

Specification `of Letters Patent.

iateatea ireb. as, une.

Application filed January 29, 1912. Serial No. 673,983.

To all whom t may concern.'

Be it known that I, 'ARTHUR H. Boi-:TT- CHER,V a citizen of the United lStates, re-

siding at (liicagoin the county of Cook and State of Illinois. havefinvented new and useful Improvements in Carbureters, of which the following is a full, clear. conoise, and exact description, reference being had to the accompanying drawings. forming a part'of thisspecification.

My invention relates to charge forming devices for internal 4combustion engines and has to do with that type of carbureter designated in the art as multiple feed` the idea being to-vary Athe amount of f uel and air supplied in, accordance with the demand made by the associated engine. This regulationis 'secured by the-use of a valve which number of the plurality of fuel supply devices provided* It .will appear that, broadly, so faras the features of myfinvention are concerned. this valve may be operated manually or may be operated automatically by means of a goveinor connected with the engine or by means of the suction of the engine.

In the specific form of my invention herein shown and described. the valve is operated by the suction of the engine and in `this way its workings are a matter of its response to the requirements of the engine. In devices of this kind it is old iii the art to provide an air inlet. a plurality of fuel jets. and a valve for 'simultaneously varyair inlet and the number of open fuel jets. The valve,'in this particular instance, is in the form of a piston, the chamber on one side of the valve being connected with the manifold of the engine. By the movement of this valve, the space connected with the engine may be made greater or smaller, in accordance with the and simultaneously more or fewer of the'gasolene inlets or jets, which are properly arranged along the -line of travel of the valve, are open to the draft of air entering the carburetiiig chamber.v These devices have been found to be effective and, so far as the movement of t'he valve is concerned, sensitively responsive to the demand made b v the engine. However, in the devices of the prior art the changes in the size of the air inlet were infinitely"A ingthe size of the ineffective another fuel inlet.

small while the amount of fuel increased step by step. That is, since there was a single air inlet and a plurality of fuel jets, and no ar angement to overcome the difiiculty, the `amount of. air admitted could he increased to some. extent without correspondingly increasing the amount of fuel, since the slightest movement of the valve would vary the amount of air but a' considerable movement thereof would be required to open or close another fuel inlet, or render The valve could move vthe entire distance between the inlets to increase the amount of air vwithout opening the next succeeding inlet.

It is the object of my invention to overcome this difficulty and to provide` a carbu` reter of the type referred to wherein the slightest movement of the valve to increase the amount of air would result in a corresponding'increase in the amount of fuel. Thus every part. ofthe movement of the valve, however slight, to increase the air inlet, will be accompanied by an increase in the amount of fuel admitted, and every inlet, when the air inlet is varied but these have not been found to be successful since the control is ditlicult if not impossible and the range is so limited.'

In order to secure the objects of my invention as set forth in the preceding paragraph. I provide a special form of valve which operates to positively open and close the fuel4 jets and also to restrict some of them. As before stated, the valve of my invention is in the formof a piston. and the cylinder in which it operates is provided with a longitudinally extending air inlet and a longitudinal row of fuel inlets.4 The valve operates to connectmore or less of this air inlet with the carbureting chamber and also positively vand correspondingly opens andcloses the fuel jets. In view of the fact that itis the definite proportion between the air andV fuel.

of the jets unintentionally. I secure this desirablefeature by means of la simple vand -inexpensive structure and the fact that some of the fuel inlets are allowed to respond partially tothe suction of the engine avoids any tendency for the leaking-or by-passing of fuel around the valve in response to any unbalanced vacuum. Thus, the uninten tional passage of fuel. which would 'upset the constituent proportions of the combustible mixture, is prevented and only't'ho'se fuel jets which are intended to operate will respond. In this 'way the device is always sensitive and accurate and maintains the proper constituent proportions of the combustible mixture Whatever be the speed of the engine. l

My invention is embodied in the 4device illustrated in the accompanying drawings, in which- Figure 1 is al longitudinal sectional View rta-ke on an axial plane through my device, Fig. 2.is a cross-sectional view taken on the -plane `ofthe line 4 4 of Fig. land looking in the directionindicated by the arrows. Like reference characters are applied to the same parts throughout the several views.

Thev main framework ofthe carbureter.

itself is in the form of a generally .cylindrical body 10 which'provides the carbureting chamber 11, a sensitive piston cylinder-12, and a valve piston cylinder 13, the cylinders extending in opposite directions from the carbureting chamber and being' in axial alinement therewith and with each other.

The carbureting chamber 11 has the upwardly extending outlet pipe 14 which is provided with a iange 15 to facilitate its at'- tachment to the piping which leads to the engine. A rock shaft 16 extends diametrically across the outlet pipe 14 and carries the throttle valve 18. The shaft 16 extends beyond its bearings in the pipe 14 and isl v there provided with an operating lever rigidly mounted thereon. If the engine with'. 'which the carbureter is associated is mounted 4asa car motor, this lever is connected by means of suitable linkages 'conveniently located on the dash of the automobile.

The sensitive piston chamber 12,- in the specific Vembodiment herein shown, is separated from -the carbureting chamber 11 by meansof a Wall25 which'has an aperture 26 providing for pneumatic connection between the carbureting chamber and its cylinvso alinement with the cylinders 12 and 13. -A

der. The wall 25`carries an elongated boss 27'jwhichv has a longitudinal bore in axial A 'Y p rod 2'8`is mounted to .slide with a bearing .A fit in `this boss, as bestillustrated in Fig.l 1-,

`this rod'b'eing of such length that it .may-

extend into both cvlinders 12 'and 13.4 With- .0f this piston. The other end vof the rod 2S is provided with apiston 34 which is the valve hereinbefore referredto and hereinafter; to be described specifically. In order to distinguish conveniently between the two pistons I shallref'er tothe piston 29 as the sensitive piston and to the piston 34 as the valve.` It will be understood, of course,

that the suction of the engine has some effect on the valve 34 and it will be noted that the valve 34 and the piston 29 are of different -diameters so as to secure a differential ac tion, the diiference' in the areas `of thetwo parts being thatwhich makes possible the effective operation.

.It will b e seen from the draWngsthat the cylinder 13 is supplemented by a downwardly extending box or passage 36 which is substituted for substantially one-fourth of the peripheral area -of the cylinder. rlhe interior of this box connects directly with the interior of the cylinderand is exposed at thebottom directly to the atmosphere as indicated at 37l This the air inlet. v

It will be seen that, for the greater part of the periphery of the valve 34, there is a suitable space between itand the inside surface of the, cylinder. Av shell or sleeve 38, as best shown in Figs. 1` and 2, occupies this space, fitting snugly within the cylinder and extending the entire length thereof. It will be noted that the sleeve 38. is not a complete cylinder, but has-what may be'termed an ,opening 40 which is approximately the same size as the opening between the box 36 and the cylinder: 13. The valve 34 is. therefore out out to accommodate the sleeve :3321s far around its periphery 'as need be,`,while the remaining part ofthe pistonis of a vradius equal to the inside vradius of' the cylinder, as

is the outer-radius of the sleeve. The'sleeve 38'carrie's ahead 39 which fits in a pocket valve 34 may ride in positive sliding contact upon the: top thereof. This block is substantially rectangular in shape and is disposed directly below the axis of the cylinder 13,

' the axes of the blocklying in the same plane therewith.- The essential feature is at the top of the block, whereithe fuel jets are, as

will be explained, Iand this top isv tangent to the surface ofthe valve '34 orbetter than there is .considerable apertures 50,

that, slightly concave to tit the convex sur face of the valve. The block- 44 is mounted upon lugs 45, 45 extending inwardly from the wall of the box 36 and from the removable cover 46, held in place by the screws 4T, 4T, which permits o ready access to the interior of the box, The box 36, as shown in Fig. 2.,-is of such size and disposition that space for the passage or air on both sides of the nozzle block.

Thehnozzle block is provided with a-plurality of . vertical passagevvays 48, 48 and the tops of these passageway-s are restricted by means of the plate 49 upon which the valve slides, this plate having alining 50', which form the fuel jets. Theoretically, it would be proper to have the valve 34 be of such width that it could cover all and positively close all the jets or nozzles at the same time. Practically, however, this is not necessary and the valver34 may be reduced in width, quite as shown in the drawings, so as to eeonomize in metal and reduce the over-all dimension of the device. since those nozzles Awhich are uncovered to t-he right so remote from the aspiration and suction effects as limited by the position of the valve that they will not respond. The position of the piston 34 determines the size of the active zone, that is. the zone subject to the suction of the engine. scribed presently, the first one, two or three nozzles 50 are exposed to this active zone. The next three, four or five, or probably more, remote from the carbureting chamber, are positively closed bythe valve 34 -while the remaining ones remote from the carbureting chamber are as much inactive as those positively closed because they are so far removed from the active zone, the zone to the right of the valve (Fig. l) being inactive or dead It will be seen that the main part'of the valve 34 fits down tightly upon the top of the nozzle block while a limited front part 51 tapers or converges toward the carbureting chamber to leave a tapered space between that part of the piston and the top of the nozzle block as illustrated in Fig. l. ln the drawings it has been necessary to exaggerate this taper somewhat in order that the illustration might be clear. It will be seen that with this construction of valve the main part of that 'member positively closes three, four or five or some other convenient number of nozzles while the tapered edge of the valve merely restricts the next one, two or three nozzles, toward the carbureting chamber, the nearest of these toward `the carbureting chamber being the least restricted. Beyond that, toward the carbureting chamber, the nozzles are free and operi..v It Will'thus be seen that provide an arrangement whereby of the valve (Fig. l) are As will be del there are first wide open nozzles, second, rer

stricted nozzles, or a series of increasingly restricted nozzles, and third, positively closed nozzles. Regardless of the position of the valve therewill always be these three sets of nozzles. lt will be seen that as the valve 34 moves to the right (Fig. l), any restricted nozzle will gradually become less and less restricted, by reason of the` gradually enlarging passageway at that point, due to the tapered part ofthe valve, until -nally it is entirely exposed to the aspiration and suction effects. Similarly, a closed nozzle is not immediately exposed to the active zone but it is gradually opened by the tapered part of the valve. Thus, however slight may be the movement of the valve there is a corresponding and propor tioncd change in the amount of fuel passing by it. Since it is only the left hand side of the-valve (Fig. l) which is exposed to the lactive zone, the volume of air passing through the box 3G and into the carburetng chamber is gradually changed, one way or the other. by means of the valve. There again, the slightest movement of the valve results in an increase inthe amount of passing air and in this way Lmaintain a constant proportion between y the constituents of the combustible mixture. In the' case of the fuel as in the case' of the air the variations are infinitely small. thisl being made possible'by the oblique valve face. The operation is positive and reliable and sensitively accurate because the fuel nozzles are positively opened and closed and the position of the valve always determines exactly those nozzles from which there is to be a response. Since there is a response from the restricted nozzles. the suction and aspiration effects which might tend to draw around the main part of the piston, unless the pressures are otherwise balanced. are satisfied in that way and there will be no leaking froml the nozzles which are intended to be positivellvfclosed. In' the drawing. the valve is shown in the starting position and it will he seen that two of the nozzles are wide open. three are increasingly restricted. and the succeeding ones are positively closed.

'The passagewavs 48. 48, which are vertical and parallel. are all connected together at the bottom b v means of a horizontal passage 52 which is alined with a passageway 53 in the wall of the box 36. This passageway communicates with a float .chamber 54 which is closed at the bottom by means of a base piece 55 to which a pipe 56, leading from the fuel supply, is connected.' The base piece is provided with a valve seat 57 with which a valve 58 is associated. This valve, through the intervention of' lever mechanism 59, 59 is operatively connected with a oat 60. ln this Way the fuel is.

maintained at a denite heighein the' non;

, chamber and in theijuel. passageways 48, 48.

I claim as new and-desire to. secure by Letters Patent:

M size of said air inlet and progressively in# l'g-In a carbureter, a carbureting chamber,' an air inlet therefof1', 'f i plurality' of fuel inlets therefor and a singleftapered vaflye -for. (simultaneously determining the ci'fejasin'gly restrictingla series of `said fuel v inlets land positively1 closing others.

av carbureter,` a 'carbureting Acharnber,l anx air inlet therefor, a'plurality offuel inlets therefor', and a single 'tapered valve responsive to the suction ofthe engine for Vsimultaneously determining the Asize .of said* air inletjan'd progressively increasingly restricting a' 'series of said'fuel'inl'ets and'positively. closing 'othersj i g3, Ina carbureten a. ber,',"a'1ifair inlet therefor, a plurality of-fu'el lioz'z'les-- therefor, a single tapered valve foi" carbnreting chaml 'simultaneously'determining the size of'said with said. valv .ar'inleband progressively restricting: some "f'fsaidv fuel nozzles and positively closing )i;lfiers, andav piston vresponsive tothe suction ofthe en gine .mechanically connected a carbureter, .a ca rlouretingV chainber, an inlet therefor, a row of fuel noztermin'ating'. in a single plane, -and a {ingle tapered'valve sliding upon said 'fuel nozzles,l forlrprogressively positively closing `someof said nozzles and restricting others and-determining the size of the vair inlet.

' In a carbureter, a carbureting chambei", an 'air inlet therefor, a row of fuely noz- ,zles terminating in a' single plane, 'and a .single tapered valve sliding upon saidfuel nozzles', for progressively positively closing soi'ne o f said nozzles and determining the .size of the air inlet, said'valve having a'part restricting other fuel nozzles. l

,;` 6. In al carbureter, a carbureting charnber, a cylindrical valve Vchamber connectedl therewith, an air' opening extending substantially the length of sald Valve chamber,. 'a fuel nozzle block arranged in said air opening, and a piston valve mounted in said valve chamber and sliding, upon the ton of tion. 1

said nozzle' block to positively close some of theznozzles, the part of said piston toward' the 'carbu'retingrchamberY be'ii'ig tapered to diminishingly restrictl the adjoining fuel nozzles, saidA piston'. valve lalso determining the part of the air openingfinjcommunication'with the carburetin'g chamber.

'7. In a carbureter, a carbureting chamber, .a cylindrical valve' chamber connectedl therewith, an air vopening extending substantially the length of'said valve chamber, a'fuel nozzleblock airranged in said air opening-, a piston valveA mounted in said valve ,c'hainbel andjsliding upon thetop of said nozzleblock to positively close some `of the nozzles, the part'of 'said piston toward the l,lcxbureting chamber being tapered to dimin- 'shingly restrict' the adjoining, fuel nozzles,

f said piston valve also determininglthe partA of the air opening incommunication with lthe carbureting chamber, a second and larger cylinder-'in alinement with saidvalve chamber,l and a piston in said vcylinder mechanically. connected with said piston valve to form a slidingstructure responsive to sucl8. In a carbureter, ah carbureting chamber, 'avcylindrical valve chamber connected therewith,' an' air opening extending substantially the lengthl of said valve chamber,-

a fuel nozzle block arranged in said 'air opening, a piston valve mountedv in said valve chamberand slid-ingiu 0n the top of said nozzle block topositi ely close some .of the nozzles, the part of said piston toward the. carburetingl, chamber being tapered to diminishingly restrict the adjoiningy fuel:

ARTHUR H. BOE'FITCl-IER.-v Vitnesses: 1

HARVEY L. HANsoN.

LEONARD E. BOGUF..

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