US1480308A - Ethel-supply device eor internal-combustion engines - Google Patents

Description

Jan. 8, 1924.

c. R. SHORT ET AL FUEL SUPPLY DEVICE FOR INTERNAL COMBUSTION ENGINES Filed y 51, 1919 WITNESS:

'MJTFM 2 Sheets-Sheet 1 INVENTORS I Umrles Rlzofi BY Q3161; Eummer;

% ATTORNE Jan. 8, 1924. I 1,480,308

c. R. SHORT ET AL FUEL SUPPLY DEVICE FOR INTERNAL COMBUSTION ENGINES Filed May 31, 1919 2 Sheets-Sheet 2 INVENTORS Patented Jan. 8, 1924;

UNITED STATES means rArENr orrics.

CHARLES R. SHORT AND CALEB E. SUMMERS, 0F DETROIT, MICHIGAN, ASSIGNORS TO GENERAL IYIOTORS CGRPC-Bi-LTIUN, OF DETRQIT, MICHIGAN, A COEPORATION OF 10 ELi-LVJA RE.

FUEL-SUPPLY DEVICE F01 INTERNAL-COMBUSTION' ENGINES.

Application filed May 31, 1919.

To all 10710711 it may cmtccru:

Be it known that we, Crmnnns ll. Snow and (linen l SUMMERS, citizens of the United tilt-ates, both residents of Detroit, ll' ayne County, State of Michigan, have invented certain new and useful lr iprovemeets in l uel Supply Devices for Internal- Combustion Engines, of which the followinn is a specification.

Our invention relates to car-bursting devices desi ned for use with internal combustion engines, and particularly to carbureting devices designed for use with liquid fuels which require a consiiilerahle amount of heat to accomplish their vaporization and the production of a gaseous mixture. such, for example, as kerosene.

The objects of our invention are to pro vide a carbureting device of the class re ferred to with improved means for vaporizing the liquid fuel employee; to provide a earbureting device in which the temperature of the vaporized fuel and of the air with which it is mixed is kept as low as practicable, to thereby secure increased volumetric efficiency of the engine; to provide a carbureting device in which a gaseous mixture better adapted for use when the engine is running under light load, or idling, will be pro duced than has heretofore usually been the case; to provide a device wherein the mixture producing function and the functions pen formei'l by intake and exhaust manifolds are combined in a single structure: and to provide improvemei'its in and relating to vi z'ious of the clen'lents and features present in and forming a part of carhin-eting devices of the type or class to which our invention relates.

With the above and other objects in view, our invent on consists in the improved carbureting device illustrated in the aecom- 'ianying drawings, described. in the following specification, and particularly claimed, and in such variations and modifications thereof as will be obvious to those skilled in the art to which our invention relates.

In the drawings accompanying and forming a part of this specification, and wherein the preferred embodiment of our invention is illustrated:

Figure 1 is a view illustratin our improved carbureting device in side elevation, and embodied in a structure wherein the ele- Serial No. 301.076.

n'ients whereby the vaporization of the liquid fuel is accomplished are combined with the intake and exhaust manifolds of the engine with which the device is used. 7

Figure 2 is a view showing a section of our invention taken upon a vertically extending transverse plane indicated by the line H, ll, Figure 1.

Figure 3 is a view illustrating our invention in plan, certain portions of the exterior casing thereof being broken away to better show features of internal construction;

Figure 4 is a view showing a section upon a vertically extending plane indicated by the line IV, IV, Figure 3.

l igure is a view showing the vaporizinp plate of our device by itself; and

Figure 6 is a view showing a section taken upon an inclined plane indicated by the line l l, VI, Figure l.

Referring now to the drawings, the reference numeral 5 designates an exhaust manifold of any suitable type, style or construction, but which is illustrated as having four passages indicated by the reference numerals 6 leading thereinto, and which passages are designed to communicate with a like number of exhaust passages provided in the engine with which our device is used, so that the exhaust may fiow into said manifold, and out therefrom through an outlet passage 7 and an exhaust pipe 8. The peripheral. wall. of the said u'ianifold is provided with a substantially vertical and fiat or plane portion, the l-ocation of which is indicated by the reference lilYlHlQltLlS 9, .lligure l, and this flat portion is provided with an opening 10 adapted to receive and accommodate a vaporizing plate which is heated by the exhaust gases flowing through the manifold, and which plate serves to vaporize the liquid fuel and produce a gaseous mixture whereby the engine is operated.

The reference numeral 11 designates a suitable casing illustrated as in the form of a supply or intake manifold having an air inlet passage 12 leading therei-nto, and one or more outlet branches or passages 13 leading therefrom and adapted to communicate with the inlet passages of the engine with which the device is used, the structure of the said manifold or casing being likewise capable of variation in order to adapt it to the particular type of engine with which our device is to be used, as will be appreciated. 1

The intake manifold is shown as having vertically extending portion into the lower end of which the inlet passage 12 leads, and from the upper end of which the outlet passage or passages aforesaid extend to the engine; and the interior of said manifold provides a mixing chamber at about the place indicated by the reference numeral 1 -l in Figure 2, and, the einl'iodiinent of our invention illustrated, a branch passage 15 is provided in the wall thereof, the said passage communicating with the air inlet 12 and serving to supply air for atomizing the fuel used in our device preparatory to the vaporization thereof, as will hereinafter ap pear. The intake manifold is provided with a vertically extending flat side wall 16, as best shown in Figure 2, which wall is adapted to extend over the opening 10 aforesaid provided in the exhaust manifold, and with a flange 1'7, see Figures 1 and 3, adapted to extend about the said opening; and the said manifold is held in. place by cap screws 18 extending through the flange 17, and by yokes 19 held in place by cap screws 20 extending into the engine, so that the same may be removed independently of the exhaust manifold, the latter being secured in place by cap screws 21 extending into the engine, as will be understood,

The reference numeral 22 designates a vaporizing plate located within the opening lO' provided in the exhaust manifold, and which plate is preferably secured to the flat surface or side wall 16 provided upon the intake manifold as by means of a series of screws arranged about the periphery thereof and extending throi holes 3, see Figure 5, so that the vaporizing plate will be removed along with the manifold when the latter is removed, as above explained, The said vaporizing plate is provided with a recess in one of its surfaces whereby a vaporizing chamber 24 is provided between the same and the wall 16, and with a pinrality of heat conducting fins upon the opposite side thereof which are exposed to the hot gases passing through the exhaust manifold, to thereby secure a more effective heating of the vaporizing plate.

A vertically extending heating passage is provided in the plate 22, the lower end of said passage being in communication with the vaporizing chamber E l throu h an opening 27, and the upper end thereof being placed in communication with the interior of the intake manifold and with the i'iiixing chamber 14 therein, as by means of a passage 28. The rate of flow through the passage 28 may be controlled in any way,

as by means of an adjustable needle valve 29.

The vaporizing chamber 24L is arranged substantially vertically, as best shown in l hrure 2, and the suction of the engine when the device is in use induces a flow of air through the passage 15 and past a fuel supply nozzle 30, whereby the liquid fuel employed is atomized, the mixture of air and fuel thus produced flowing through a tube 81 extending through the supply manifold in the en'ibodiment of our invention illust ated. and which tube, in connection with the par-. and the fuel supply nozzle provides a fuel supply conduit discharging into the vaporizing duimber adjacent the upper end thereof.

The stream of air and fuel supplied through the fuel supply conduit aforesaid is directed against the heated vertically extending inner surface or wall of the vaporizing plate, and wets and runs down the same to a greater or less extent depending, obviously, upon the rapidity with which the liquid fuel intercepted by the plate is vaporized, the fuel in question passing off from the heated surface, whereby its vaporization is accomplished, into the com paratively large vaporizing chamber s fast as it vaporized by heat derived from the vaporizing plate, as will be appreciated, the average temperature within said vaporizing chamber being materially lower than the temperature of the vaporizing plate because of the relative location of the parts of our device and the continuous flow of air and fuel theret-h rough.

The lower end of the vaporizing chamher is placed in communication with an annular passage 32 formed, preferably, in the ex ,rior surface of a Venturi tube located in the air inlet passage 12, by means of an opening and the vaporized liquid fuel and the air which is mixed therewith flow from the passage 32 through openings 35 in the venturi, and mix with additional air entering through the air supply par- 1,, or 2, the opening 341-, the annular passage 32, and the openings providing a perma- .nently open passage. leading from the lower end of the vaporizing chamber and discharging into the air supply passage. T he completion of the mixing of the rich preliminary mixture thus provided with tlie diluting air to form a proper combustible mixture is accomplished in the mixing chamber 14:, and as the mixture flows along the passage or passages leading to the engine, as will be understood.

The flow through the carbureter casing or intake manifold is controlled by a suitable throttle valve to thereby regulate the operation of the carburetor and the speed of the engine with which the same is used. In the embodiment of our invention illus trated the throttle valve is located in the vertically extending portion of the carbureter casing, and between the points at which the passage leading from the lower end of the vaporizing chamber discharges into the air supply passage 12 and the point at which the passage 26 discharges into the casing through the passage 28, the said throttle valve being designated by the reference numeral 36, and the same being shown as of the ordinary butterfly type, although any kind or type of throttle valve may be used so long as it is suitable for the purpose of controlling the flow through the carburetor casing or intake manifold.

Liquid fuel is supplied to the nozzle 30 through a fuel supply passage 37 leading from a fuel reservoir 38, which'reservoir is supplied through a fuel supply pipe 39, and within which reservoir a constant level of liquid fuel is maintained by a valve 40 controlled by float 4:1, by an overflow device, or otherwise.

The rate of flow through the fuel supply conduit 37 is regulated by a rotary controlling member 42 housed in a passage pro vided in a boss 43 formed on the side wall of the fuel reservoir 38, see Figure 4, which rotating member is provided with a central passage 44-, with which a plurality of separate passages 45 differing in size one from another, see Figure 2, communicate, and any one of which passages may be brought into a position to establish a communication between the passage 37 and the nozzle 30 by rotating the member 42. This construction provides in effect a plurality, four in the embodiment of our invention illustrated, of fuel supply passages any one of which may be used independently of the others, the operator being thus enabled to regulate the supply of liquid fuel throughout wide limits and according to the speed and load conditions under which the engine is operating, although he cannot shut off the supply entirely for the rotating member 42 is arrested and held in positions such that an opening 15 registers with the fuel supply passage 37 by means of a spring-pressed stop or catch 46 in engagement with the recesses l7 provided, in the member 4L2, and having in clined sides, as illustrated in Figure 6 of the drawings.

The fuel supply reservoir is secured to the supply manifold by means of cap screws 48 or equivalent securing means so that the same may be readily removed from the sup ply manifold, or removed therewith when the latter is removed as hereinbefore explained, as will be appreciated, the said manifold being provided with a suitable boss a9 to facilitatethe securing of the fuel supply reservoir thereto, as best shown in Figure 3.

While in the foregoing description of our carbureting device we have referred freipiently to the intake and exhaust manifolds present in the preferred embodiment of our invention illustrated, and in which embodiment the elements concerned with the production of the combustible mixture are merged with the manifolds in question, our invention, considered in its broader aspect and merely as a device for providing a combustible mixture, is by no means limited to a structure in which elements whereby the mixture forming function and the functions performed by intake and exhaust manifolds are combined and form a single structure of such form, shape, and outline as to provide for all of said functions, although the more restricted and specific form of our invention does con'iprehend a single structure having means for producing a combustible mixture, and having a form, shape and arrangement of the parts such that intake and exhaust manifolds for the engine are present in such structure. e have, therefore, in the broader claims wherein the distinguishing features of our invention are enun'ierated defined the invention as comprising a casing, together with other elements and features whereby a carbureting device is provided, while in the more specific claims the casing takes the form of an intake manifold, as illustrated in the drawings, and the elements which collectively form the device, regarded in its more comprehensive aspect, provide also the intake and exhaust manifolds for the engine, in addition to means for producing a combustible mixture for use therein.

When our improved carbureting device is in use, and assuming that the throttle valve is open so as to permit a free flow through the intake manifold or carbureter casing, the suction produced by the engine induces a flow of air through the fuel supply conduit formed by the air passage 15 and the tube 31, and into the vaporizing chamber 24, the liquid fuel being entrained by the air as it flows past the fuel nozzle 30.

The liquid fuel thus supplied to the vaporizing chamber is vaporized therein, and the rich preliminary mixture thus formed flows from the chamber through the opening 3 1-, passage 32, and openings 35 into the main stream of air entering the casing through the air inlet passage 12, and mixes therewith as the mixture flows toward the engine.

If new the throttle valve 36 is moved toward its closed position the quantity of mixture flowing through the intake manifold and to the engine is reduced, and, as such valve reaches or approaches its completely closed condition, a flow of air and vaporized fuel from the vaporizing chamber 24-, and of air through the air inlet passage 12, openings 35, passage 32 and opening 34-, will be established through the opening 27 and upwardly along the passage 26, and tl'n'ough the passage 23 and into the carburetor 3L1Si1-19 the Q'lizlttll. )art it not the entire quantity of the mn-iture flowing to the engine when. the throttle v; lve is closed or nearly closed taking; place through the passage 26 in the vaporizing plate, although it will. be appreciated that the volume of mixture thus supplied to the engine is much thui' is the case when thethrottle valve is open, at winch time little or no nurture flows through the passaga 26 and into the upper end oil? the carburetor casing.

The throttled condition above niez'itioned obviously that which is present when the ine is opcratmg without load, or idling, luring; which time the tpiantity of combusible mixture flowing); to the on re 1s cone z ativcly snnli. .thc proportion. of fuel resent in said mixture, however, 1n-

I in our device as the throttle valve pproachcs its closed posiion, in order to [will ti ereby insure a more cefie: ignition, and o more complete bu ning; of the mixture nider the lower maximum compression. preisure corulitions resulting}; tron]. the reduced quantity of i'n ii'ture entering the ermine cylinders, this increase in the quantity of fuel supplied being due to the turn tha "he ro duced flow of air i1ll1'()".l5{ 1li the restricted openings is accomplished by an inordi fall of pressure within the carburet cur :sults in air increased siuition e'llcct at tle iiu-el nozzle 30 over that present at said nozzle when the throttle valve is open, which increase in suction the nozzle results in an inc "cased low oi. fuel theretl rough, will ood.

roe valve 29 used "0 adjust the can l')'ljl1'i'lh novice to the engine with which it used so that the engine will run properly or idle at low speed, and under reduced or no load conditi ms, and the pass throu which the mixture flows to the engine when idling is so disposed that it nary be heated, by ranging: said pasload conditions and normal vith full which lack of heat may charges, result in incomplete aporization of: the fuel in the vaporizing chamber. Such inconuilcte vaporization, however, is con'ipleted or more nearly completed by causing the mixture to flow through the heated passage 26, whereby a proper combustible mixture for use when idling, or when operating with the throttle valve closed to a considerable extent, is secured.

The liquid "fuel, being discharged into the vaporizing chamber 24 at the upper end thereof and against the vaporizing plate 22, wets the plate and runs down the same until it is vaporized, there being no accumulation of liquid fuel within the vapo 'izing chamber 'l'ucl being}; vaporized very soon after the fuel reaches the plate, while the greater heating ell'ect due to longer contact with the plate as it runs down the same may be necessary to vaporize the less volatile portion of the :tue As to all parts of the fuel, however, .11: vapors produced by their vaporization ass from the plate immediately upon bc 1;); produced and mingle with the ontents the vapriirizing chamber, the average temperature of which is much lower than the temperature of the vaporizing plate.

tenlperaturo ,vithin the vaporizing chamber as con'iparcd with the temperature of the vaporizing plate is due to the strustural features oil? our device wherein the vapori chamber located between the H porizang plzette and the much mixing chamber, and to the features in, construction, 1 ment and (moi-alien oi the vaporizinq r are itself, it i obvious that in designing the device a ,y to provide only for a ten1- "he vaporizing plate suliiciently atomizoe 1 1o vaporize the thin film of liquid tuel n u lows down the surface thereof, as distinguished from providing for heating the entire volume of the chamber to the v2 porizirig "temperature, as would be necessary it the l liquid fuel. was to be v2 nuizezl by coinluction of heat from one particle to another throughout the mass thereof, as has heretofore commonly been the case. It there its follows that the tem- 1 utcd tllilll the (piantity or mass of stible i1'1ii-;'ture entering; the cylinders upon the suction stroluas of the pistons will be increascc, and high volun'ictric e'lliciency ot the engine thereby secured.

ln view of the tact that an enriched mixture is desirable, it indeed not necessary, at startiugy it will be appreciated that an. engine equi iped with our improved carbureting device may be readily sta ted, the throttle *alve being closed at such time and the mixture produced. being a much enricl'ied mixture, because of the :tact that increased suction effect will be produced at the "fuel. supply nozzle over that which would be present thcreat fl air could enter the carburetor casinp; freely through the air inlet 12. In tact the presence of the enriched mixture, together with the more eli'ective atomization. which results from a strong flow past the fuel supply nozzle, provides a scheme whereby the engine may ordinarily be started cold, and with kerosene as a fuel.

As changes of construction could be made within the scope of our invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense; the distinguisln ing features of our invention being particularly pointed out in the following claims.

Having thus described and explained our invention, we claim and desire to secure by Letters Patent 1. In a carbureting device for internal combustion engines, a casing having an air inlet passage leading thereinto and a mixture outlet passage leading therefrom, a vaporizing chamber, means for heating said vaporizing chamber, means for supplying atomized liquid fuel to said vaporizing chamber to be vaporized therein, a passage leading "from said vaporizing chamber and discharging into said air inlet passage, a passage leading from said vaporizing chamher and discharging into said casing, and a throttle valve for controlling the flow through said casing.

2.11 a carbureting device for internal combustion engines, a casing having an air inlet passage leadingthereinto and a mix ture outlet passage leading therefrom, a vaporizing chamber, means for heating said vaporizing chamber, means for supplying atomized liquid fuel to said vaporizing chamber to be vaporized therein, a passage leading from said vaporizing chamber and discharging into said air inlet passage, a passage leading from said vaporizing chamher and discharging into said casing,' adjacent the mixture outlet passage leading therefrom, means For heating said last nien tioned passage, and a throttle valve for controlling the flow through said casing.

3. In a carbureting device for internal combustion engines, a casing having a vertically extending portion, an air inlet passage leading into the lower end thereof, and a mixture outlet passage leading from the upper end of said casing, a vertically extending vaporizing chamber the lower end of which is in permanently open. communication with said air inlet passage, a passage leading from said vaporizing chamber and. iftlischarging into said casing adjacent the upper end thereof, means for supplying atomized liquid fuel to the upper end of said vaporizing chamber, and a throttle valve for controlling the flow through said casing.

4c. In aca-rbureting device for internal combustion engines, a casing having a vertically extending portion, an air inlet passage leading into the lower end thereof, and a mixture outlet passage leading from the upper end of said casing, a vertically extending vaporizing chamber the lower end of Which is in permanently open communication with said air inlet passage, a passage leading from the lower end of said vaporizing cha1nher and discharging into said casing adjacent the upper end thereof, means for heatingsaid passage, means for supplying atomized liquid ifuel to the upper end of said vaporizing chamber, and a throttle valve for controlling the flow through said casing.

5. In a carbureting device for internal combustion engines, a casing having an air inlet passage leading thereinto and a mixture outlet passage leading therefrom, a throttle valve for controlling the flow through said casing, a vaporizing chamber, means for heating said vaporizing chamber, means for supplying liquid fuel to said vaporizing chamber to be vaporized therein, a passage leading from said vaporizing cham beer and discharging into said air inlet pas- Sage between said throttle valve and the external atmosphere, and a passage leading from said vaporizing chamber and discharging into said casing between said throttle valve and the engine with which the device is used.

6. In a carbureting device for internal combustion engines, a casing having a vertically extending portion, an air inlet at the lower end and a mixture outlet at the upper end of said casing, and a throttle valve located between said inlet and outlet, a vertically extending vaporizing chamber the lower end oi? which i in permanently open communication with said air inlet, a pas sage leading in said vaporizing chamber and discharging); into said casing above said throttle valve, and means for supplying liquid iiuel to the upper end oi" said vaporizing chamber.

7. In a carluireting device for internal combustion engines, a casing having a vertically extending portion, an air inlet at the lower end and a mixture outlet at the upper end of said casing, and a throttle valve located between said inlet and outlet, a vertically extending vaporizing chamber the lower end of which is in permanently open communication with said air inlet, a passage leading trom the lower end of said vapor izing chamber and discharging into said casing above said tln ttle valve, means for heat ing said passage, and means for supplying liquid Fuel to the upper end oi said vapor izing chamber.

8. In a carbnreting device for internal comlnistion engines, a casing having an air inlet passage leading thereinto and a mixture outlet passage leading therefrom, a throttle valve for controlling the flow through said casing, a vaporizing chamber,

means for heating said vaporizing chamber,

an air supply conduit leading; into said vaporizing chamber, a fuel supply nozzle discharging into said air supply conduit, a passage leading from said v21Q0llZl1'lZ chainber and discharging into said air inlet passage between said throttle valve and the c ternal atmosphere, and a passage leading from said Yap rizing chamber and discharg ing' into said casing between said throttle valve and the engine with which. the device is used.

9. in a carbu'eting device for internal combustion. engines, a casing having a ver tically extending; portion, an air inlet at the lower end of said casing, and a mixture outlet passage at the upper end there of, a throttle valve located in said vertically extending; portion, a vertically extending vaporiziiiig chamber the lower end of which is in permanently open con'ununication with said air inlet, a passage leading); from said vaporizing chamber and. discharging into said casing above said throttle valve, an air supply conduit leading from said air inlet and discharging into said vaporizing chamber, and a fuel supply nozzle discharging into said air supply conduit.

10, In a carbureting device for internal combustion engines, a casing having a vertically extending; portion, an air inlet at the lower end of said casing, and a mixture outlet passage at the upper. eru'l thereof, a throttle valve located in said vmtically ere tending portion, a verticalbx ex ending vaiiiorizin'g' chanioer the lower end of which is in permanently open coinn'iunication with said air inlet, a passage leading); from the lower end of said vaporizing; chainl'ier and discharging into said casi above said throttle valve, means for hca ing said passage, an air supply conduit extending); through said casino; and discharging into the upper end of said vaporizing chamber, and a fuel supply nozzle past which the air flowing through said conduit flow". 11.. In a carbureting device for internal combustion engines, an exhaust manifold having a wall provided with an opening, an intake manifold secured to said exhaust mani fold, a vaporizing plate located within said opening, a portion of said intake u'ianifold cooperating; with said vaporizing plate to form a 'aporizing chamber which is in cou1-- munication with the inlet end of said in-- take manifold, a fuel supply conduit discharging into said vaporizing chamber, and fuel supply nozzle disclnn-g ing into said fuel supply conduit.

12. In a cal-bursting combustion engines, an exhaust manifold having a wall provided with an opening, an intake manifold secured to said exhaust manifold, a vaporizing plate located within said opening, a portion of said intake inanifold cooperatin with said vaporizing plate to device for internal form a vaporizing chamber the lower end of combustion engines, an exhaust manifold having a vertically disposed wall provided with an opening, an intake manifoldsecured to said e); aust manifold and having a wall extenuina" across the opening aforesaid, a vaporizing plate located. within said opening W a recess whereby a vaporizing;

and have chamber is provided, and the lower end of which vaporizing chamber is in permanently open coinnnuiication with the inlet end of said intake manifold, a fuel supply conduitdisrhargin into the upper end of said vaporizing chamber, and a fuel supply nozzle discharging into said fuel supply conduit.

14. In a carbureting device for internal (JOI'llbUStlOll engines, an exhaust manifold having a vertically disposed 'wall provided with an opening, an intake manifold seemed to said exhaust manifold and having a wall extending across the opening aforesaid, a vaporizing plate located within said opening and secured to said intake manifold and having a recess whereby a vaporizing chamber is provided, and the lower end of which vaporizing chamber is in pernnuiently open communication with the inlet end of said intake i'i'ianifold, a fuel supply conduit extending through said intake manifold and discharging into the upper end of said vaporizing chai'i'iber, and a fuel supply nozzle disclnirging into said fuel supply conduit.

it. In a oarburcting device for internal combustion engines, an exhaust manifold having a vertically disposed Wall provided with an opening, an intake manifold secured to said exhaust manifold and having a wall extending across the opening aforesaid, a vaporizing; plate located within said openi ng and having a, recess, said wall covering said recess and thus providing a vaporizing chamber, and the lower end of which vaporizinp; chamber is in permanently open ron'ni'ninication with the inlet end of said intake n'ianifold, a fuel supply conduit discharging into the upper end of said vaporizing chamber, a fuel supply nozzle discharging into said fuel supply conduit, a passage leading from the lower end of said vaporizing chamber and discharging into said intake manifold adjacent the upper end thereof, neans for heating said passage, and

a throttle valve for controlling the flow through said intake manifold.

16. In a carbureting device for internal combustion engines, an exhaust manifold having a vertically disposed wall provided with an opening, an intake manifold secured to said exhaust manifold and having a wall extending across the opening aforesaid, a vaporizing plate located within said opening and having a recess covered by the said Wall of the intake manifold whereby a vaporizing chamber is provided, and the lower end of which vaporizing chamber is in permanently open communication with the inlet end of said intake manifold, a fuel supply conduit discharging into the upper end of said vaporizing chamber, a fuel supply nozzle discharging into said fuel supply conduit, a

passage leading from the lower end of said vaporizing chamber through said vaporizing plate and discharging into said intake manifold adjacent the upper end thereof, a valve for controlling the flow through said passage, and a throttle valve located between the discharge end of said passage and the point at which the lower end of the vaporizing chamber communicates with the inlet of said intake manifold for controlling the flow tlierethrough.

17. In a charge forming device for internal combustion engines, a vaporizing plate having a recess adapted to provide a vaporizing chamber, a plurality of fins projecting from said plate, and a heating passage formed in said plate and communicating with said recess.

18. In a char e forming device for internal combustion engines, a vaporizing plate having a recess adapted to provide a vaporizing chamber, and a heating passage formed in said plate and one end of which passage is in communication with one end of said recess.

19. In a charge forming device for internal combustion engines, a vaporizing plate having a recess adapted to provide a vaporizing chamber, a plurality of fins projecting from said plate, and a heating passage formed in said plate and one end of which passage is in communication with one end of said recess.

20. In a charge forming device for internal combustion engines, a vaporizing plate having a recess in one of its sides adapted to provide a vaporizing chamber, and a plurality of fins upon the side thereof opposite said recess.

21. In a charge forming device for internal combustion engines, a vaporizing plate having a recess in one of its sides adapted to provide a vaporizing chamber, and a heating passage extending through said plate and communicating with said recess.

22. In a charge forming device for in ternal combustion engines, a vaporizing plate having a recess in one of its sides adapted to provide a vaporizing chamber, a plurality of fins extending from the surface of said plate which is opposite said recess, and a heating passage extending through said plate and located between said fins and said recess and one end of which passage is in communication with one end of said recess.

In testimony whereof, we our signatures.

CHARLES R. SHORT. CALEB E. SUMMERS.

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