US1759294A - Carburetor - Google Patents

Description

i May 19x30. o. BAUMGARTNER.

CARBURETOR 2 Sheets-Sheet 1 Find oct. 2.. 192e May 20, '1930 o. BAUMGARTNER l 1,759,294

CARBURETOR Filed Oct. 23, `1926 2 Sheets-Sheet 2 27 74. j; kg 70 Patented May v2G, 1930 maza-1 UNITED STA-TES PATENT OFFICE o'rro BAUMGARTNER,' 0F DURRENAST, NEAR Traun, SWITZERLAND, ASSIGNOR To Y [ARNOLD HAEFELI, or MUNICH, GERMANYv l a c `cAniaUniin'on n f. Application led Octobery 23, 1926, Serial No. 143,694, and in Switzerland December 19,1925.

v The present invention refers to carburetors for internal combustion engines of the type in which the amountof air passing through the induction pipe ofthe motor is regulated by g l means of a regulating valve arranged transversely to the flow of air.y The present invention comprises improved constructions of such carburetors.` a

According yto .the present invention the '10 regulating valve controlsy they flow of air through channels of oblong cross-sections and simultaneously the exit areas of the fuel nozzles so that the throttling curve. of the regu- Alating valve, obtained by plotting the un- ]5 covered cross-sections asabscissae and the v paths of the valve as ordinates, and the curve of the exit areas of the fuel nozzle, obtained by plotting the. uncovered areas o f the fuel nozzles as abscissae and the paths of the valve' as ordinates, arestraight lines and are in proportion to each other; the exit ofthe fuel occuring always in the smallest cross-sectional area through which the air passes and the discharge opening of the fuel nozzle being parallel to the fuel level in the'chamber containing the float. y

- Other objects of the invention are improvements to details of this carburetor which will be described hereinafter with reference to the accompanying drawings which show constructional examples of the carburetor according to the presentvinvention and of details thereof. In particular: z

LFig.`1 shows the arrangement of a carburetoraccording to the invention on the suction manifold of a motor, l

Figs. 2-7 vshowa first, constructional -example of which Fig.y 2 is an elevation view, Fig. v3 is a horizontal section along line III-III 'in Fig. 2, I

Fig.'7 4 is a cross-section along line IV-IV `in Fig.f2, through the regulating-valve and the fuel nozzle; l

Fig.l 5 is a.vertical':longitudinal section Yas 'a hollow Apiston valve.

- u along line V--V in Fig. :3, showing the fuel supply, the fuel chamber with the float and the regulating valve;

F ig. 6 is a vertical longitudinal section along line VI-VI in Fig. 3 showing the fuel chamber, the nozzle and the connection between the two, 4

Fig. 7 is an elevation view seen against the .air outlet end Vwith, which the carburetor is modified type of fuel nozzle, with which av foaming mixture of fuel and airjleaves the slot of the nozzle, Y Y

Fig. 9 is a cross-section of the nozzle along line IX-IX in Fig. 8, Y Y

Fig. 10 is a cross-section of the nozzle along line 'X-X in Fig. 8.

Referring now to the iirst constructional example illustrated in Figs. QJ l designates the casing of the carburetor and 2 is the regulatingyalve or throttle valve kconstructed The `air for the charge is admitted through an oblong apertureand channel 3 and the charging mixture flows to the suction manifold A of the motor B, to which the carburetor is fixed by means oblong aperture and channel4. The-air thus flows in a transverse direction to the piston valve 2 as is indicated by the arrows shown in Figs. 8 andy 4i. The fuel nozzle is vformed y by a horizontally arranged rod 6 provided with a fine slot 7 communicating with a wider slot 8.' The nozzle rod 6 is arranged at a point of the inlet aperture 3 where the highest speed of the drawn-in air is present. The fuel is supplied to the carburetor by the fuel pipe 8 joinedto a cover 11 of an extension of the .carburetor casing lby means of a nippley 9 screwed into the cover and a coupling nut l0 as is best seen in Fig. 5. 'Withv the bore l of the nipple 9'bores l2 and 13 in the cover ll are communicating and the latter is controlled by a needle valve 14 fixed on a float 15.V The latter is arranged'inthe chamber 16 formed by theextension of the carburetor Vcasing 1 and is guided by a pin 17 slidably arranged Yin a slot of a set pin 18.' The cover 11 is xed to the extension of the casing 1 by means of set screws 19 one of which is shown in Fig. 6.

The chamber 16 containing the float 15 is in communication with a-slot 2O arranged be-V f Y low the nozzle rod 6 means of a bore 21 (Fig. e).

VAThe piston valve 2 is provided with a set screw'23, which glides along the slot 7 of the nozzle 6 and which limits the eiicientlength of the Vslot 7 through Ywhich fuel isdrawn by the stream of air.V Theadjustment ofthe piston valve is effected in the known manner from the accelerator byV a rod 24. (Fig. 1) and a lever 25, the free end of which is connected to a member26 the end of which is providedV with screw thread 27 cooperating with the Y end-wall 28 of the piston valve 1. The screw thread 27 serves toV adjust lthe ilo-load position of thepiston valve 2. That is to say, by turning the member 26 more or less'in one direction or the other, the end 4of the screw 27 projects from the end wall 28 Aof piston 2 to a greater or less extent',1whereby the amount of the opening ofthe slot 3 Vis lincreased or diminished when the piston lis.

pushed to its limit in one direction and so determines the r extent of opening of the slot 3 when the motor is idling. The screw then abuts against the-piston bore end wall.y g

The nozzle rod 6 is provided with ahexagon head 29fby means of which the rod4 6'may be withdrawn and angularly'adj usted; a set pin 30 engaging a notch 31 in the rodV 6 secures the latter in any adjusted angular position. By the angular adjustment the action yof the f drawn in air on the slot 7 of the nozzle and 4 thereby the amount *ofV fuel sucked `through vsaid slot Vmay be varied;

The single piston valveA controlthe'inlet fand the outlet openings for the'air and simultaneously the exit area of the fuel nozzle.V

" pass through thelarge bore in which the pis- Y Y ton valve slides, whereby the speed ofthe airV is reduced and the pressure is'increased, then the speed of the `charging ,vmixturef is increased again when the latterpasses through thedischarge or outlet aperture of the'carburetor. j

With such fuel nozzles the danger exists thatV when the carburetor casing expands by the influence of the heat transmitted from he motor block' the slot of the nozzle is nar- I rowed or completely closed if the longitudi-V v nally slotted rodshaped nozzle is not. so

constructed that it is adaptedY to withstand lateral thrusts or is relieved of these thrusts.

These disadvantages are overcome by the fuel nozzle illustrated in Figs. 8-10.

This fuel nozzle consists of ahollow member slotted on the top at 32 and provided with holes `33 at the bottom. The bore of the hollow member may bey obtained b Vdrilling holes from both sides of the mem er which` holes do not meet sothat a diaphragm V34: is left or the fuel vnozzleinay consist 'o'f a 'com'V tube in which `a'diaphragm 34 is inserted.

The provision of an upper slot 82 and 'lower' bores 33 has the effect that by the action of the' suction vpressure .fuel is drawn V into the hollowinterior of the tubular nozzle which mixes in said interior f with air entering through that part yof the slot 32 froml above,

which does not serve'as discharge area for the fuel. Thereby a foaming Vmixture of fuel and air is obtainedwhich passes through the operative part of theslot 32py .1, In a carburetor', thejcombinationwith casing having twoVV parallel boresl and a transverse air VslotV extending across the'bores; of a tubular fuel nozzle in one of the bores,

'said nozzle havinga longitudinal "slot in its upper portion presented tothe air passing through the air slot and a longitudinal seriesl a Y 'of holes in the lower portionv of the nozzle lpresented to the liquid fuel, a recipro'cable valve in the other bore controlling the supply of air through the airslot andthe area` of the nozzle slot presentedY to said air. Y y

2. In a carburetor, the combination with a ies casing having two parallel bores and a trans- Y verse air passage over one bore and extending through'the other bore; of'a tubular fuel ynoz- -zle in one bore having a fuelv discharge swept by theV air through said `passage,'means to regulate the area of said passage and the areaof said discharge, said nozzle having a longi-` tudinal series of holes yat its bottom presented to the liquid fuel, anda partition in said nozzle near one end thereof" determining Y fuel supply during the idling of the engine to `which the carburetor is applied.

3. In a carburetor, the combinationwith avcasing having two parallelb'ores of different sizes, .a transverse air passage extending across the casing and passing transversely izo above the smaller bore and'through the larger bore; of a piston in the largerbore controlling y both the entrance and thev discharge Vof fuel,

mixture to, and from the larger bore, a nozzle member in the smaller b ore havingy a` Vdischarge along the length thereof open to air throughout itsV length, a fuel slotV below the Ynozzle member communicating with the member, a float chamber in the casing communleating Wthsaid slot, and a .pin on the piston riding over said 'discharge and `limiting the area of said discharge traversed by the air passing through said passage so as to produce a foaming mixture Within the nozzle by air entering the discharge at one side of the pin While the fuel discharges at the opposite side. Iny testimony whereof, I have signed my name to this specification;

OTTO BAUMGARTNER.

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