US2615696A

US2615696A - Carburetor

Info

Publication number: US2615696A
Application number: US8951A
Authority: US
Inventors: Albert H Winkler
Original assignee: Bendix Aviation Corp
Current assignee: Bendix Aviation Corp
Priority date: 1948-02-17
Filing date: 1948-02-17
Publication date: 1952-10-28
Anticipated expiration: 1969-10-28

Description

S x Y 9 ww Nl R. N 6 f \11\ o 5, N. 1ML @k MM m m, uw Nw mm n 2 I. NN A H. T 1 QM. o O MN?) M Q V z f Mw E w imQ|f|| o m m u, www w., -m o i m mu l... Wl m o W. m M l IIUI l lll l IU Nw ,M H C d u A. NN mm gw W M n n\\\\. MR IIN s ,l w h ml J|u ,A u L k- 9 wm 1 1 Q s, f M 2 w S, f Ww s Patented ct. 28, 19562 UNITED STATES PATENT OFFICE y:2,615,696 ff 5 y i 'y ytCARBURETORV s Albert Winkler, South Bend, Ind., assignerv to Bendix Aviation Corporation, South BendJndo.,y

" acorporationof Delaware* f1 i Appiiation February. 17, 194s, serial kut, 8,95;-

The present inventionl relates -to carburetors for internal combustion engines and more par.-

ticularly to the main fuel and idle systems for said carburetors p One of the principal objects of the present inf vention is to provide a compact and efficient main bustion engine.

Another object of the invention is to provide a simplified fuel discharge nozzle which can be easily produced and readily assembledin va carburetor and which gives good fuel distribution in the induction passage of a carburetor.

A further object is to provide a means-forminimizing percolation of the fuel in the idling` system. y ,l

Additional objects and advantagesof the .present invention will be apparent from the following description and accompanying drawings, in which: y

Figure 1 is a vertical cross-section of afcarburetor, wherein some of the elements have been rearranged to more clearly show their-functional relationship to one another; and y o i Figure 2 is a vertical cross-section ythrough the venturi and the main discharge jet of the carburetor shown in Figure 1. 'y f Referring more specifically tol the drawings wherein one embodiment of my inventiony is shown, numeral l designates aninduction passage of the carburetor, I2 the air inlet, Ai4 the mixture outlet, I6 a choke valve, and I8` a throttle valve, said" throttle valve being mounted on a throttle valve shaft j ournaled inthe throttle body of the carburetor. A conventional fuel bowl 22 is formed integrally with the main :body of the carburetor and is provided with a fuel inlet valve 24 and a float mechanism 26 forcontrolling the flow of fuel through inlet valve 24.' The fuel is discharged into the induction passage at the throat ofthe venturi 30 through v.a discharge nozzle 32 which communicates with the fuel bowl through a well 34 and a main fuel metering jet 36 located along one side of well 34. AA sleeve 40, havingseveral small holes` 42 inthe kwall thereof, is disposed in said well and is lspaced from the internal wall thereof rto permit air and fuel to surround the vsleeve and pass lthrough holes 42 into the internal portion of said sleeve.l The air entering well 34 and sleeve 40 is admitted from the air intake end I2 of the induction plassage through av port-44 and is metered at orifice 46 as it passes downwardly through, passage 48 to the annular spacebetweensleeve klli) andthe side wall of Well 34. In this construction, the fuel 1o claims. (o1. zei- 41) into.well"34. and into the lower end of sleeve 40 and lpasses upwardly through said sleeve where it formsan emulsion ywith the air admittedthroughy theholes 42.y The vfuel--air emulsion so formed .isdischarged through nozzle` 32 into the throat of the venturi 30'.v` f Y g i `'The fuel no'zzle 3 2 is'arranged to'discharge fuel adjacent the under iside of a horizontal bar 50 and is prov'idednearjthe discharge end Vthereof withv a vdownwardly tapering 4ear 52 to prevent throughthe induction passage. Other irregularifuel from `flowing alongv the under side of said nozzle Vto the `venturi and thence down the'side wall of, the induction`- passage. A similar earr 54 is disposed onthe opposite side of the venturi 'un` der bar'f; A'fbead 56 disposed vonthe topr sideof bar 'ine'ar theV central portion thereof, as shown inFig'ure 2, 'concentrates the discharge,k of fuel in the central portion of the induction passage,and,i together, with the venturi, provides good distribution of the fuely in the air flowing ties maybe provided on bar 50, such as one or more vgrooves or ribs on the sidesor'bottom `thereof, to obtain the desired distribution of thefuel in the induction passage. f

The idlesystem of the carburetor includes anV anti-percolating weil 58, a horizontal passageQG/D connecting said well with the lower portion of well 34, and adischarge conduit 62 connectingk f welljiS- with thevinduction passage at ports 64 andJGS above and .below the throttle valve i6, respectively. The discharge conduit consists in partof a U-shaped 'tube '08 disposed in the fuel bowland surrounded byI fuel so that the idling fuel passing therethrough is maintained at a relatively` low temperature to minimize percolation of the 'fuel therein. The uppermost curved pori tiori` of the tube is above the fuel level and cone tains a port r'I0 `for bleeding air into the idle dise charge conduitto form a fuel-air emulsion. Tube B8 `extends into the'lower portion of well 5Bvso thatany fuel vapors passing through conduit intof said well accumulate in the top portion thereof, above the entrance to tube 68, and do not lpass vthrough said tube. When the throttleI valve isfinclosed or nearly'closed position, ,the fuel flows from well 34 through horizontal` con# duit 6o to wen 58 and'then passes through tube 68 Where it mixes with the air admitted through .port 'I'0 to form the fuel-air emulsion which is discharged through port 66 into the induction.k passage on'y the engine side of the throttle va1ve.` Additional air is bledY into the idle air system at f port `I2 throughoutfther entire operation ofthe idle system and also at port 64 when the edge of the throttle valve I8 is below said port. As the throttle valve is opened and the edge thereof passes above port 64, fuel is discharged through both ports 64 and 66, thus providing additional fuel for the increased iiow of air through the induction passage. An idle adjustment valve 16 controls the quantity of fuel-air emulsion discharged through port 66.

A power enrichment jet 80 connects the fuel bowl with conduit 60 and is controlled by a valve 82 urged to its closed position by a spring 84. Valve 82 is operated by a reciprocable rod 86 which is urged in the direction to open said valve by a spring 88 reacting between a plate 90 secured to the lower end of said rod and a disclike plate 92 secured to the fuel bowl cover. The rod 86 is secured to and actuated by a piston 94 mounted in cylinder y96 which is connected at its upper end by a conduit, not shown, with the induction passage on the engine side of the throttle valve. During high power output when manifold vacuum is low, spring 88 urges plate 90 against the stem of valve 82 and opens the valve to permit additional fuel to flow through conduit 60 into well 34 to supply an enriched fuel-air mixture. The power enrichment jet is always maintained in open position when the engine is not running, and the vapors that collect in the top portion of well 58 pass through conduit 60 to the power enrichment jet and thence into the fuel bowl.

A manually actuated accelerating pump generally shown at consists of a cylinder |02, a piston |04 and a lever |06 connecting the upper portion of said piston with the throttle valve actuating mechanism |08 mounted on one end of shaft '20, as shown in Figure l. When piston |04 is raised, fuel flows from the fuel bowl into the lower portion of cylinder |02 through a check valve controlled conduit ||0, and as the piston is moved downwardly on the opening movement of the throttle valve, the fuel is discharged from the lower end of cylinder |02 through conduit 2 and discharge orifice ||4 disposed near the throat of venturi 30. An air duct I6 connects the upper end of conduit ||2 with the induction passage I0 above venturi to break the eiect of Venturi vacuum on the fuel in conduit ||2. A ball check valve ||8 is disposed in an enlarged portion |20 of conduit ||2 and is adapted to seat over the fuel inlet of the enlarged portion when the accelerating pump is not in operation and to seat over the air inlet, i. e. the lower end of duct ||6 when the fuel is being discharged from the accelerating pump. This ball check valve thus permits air to bleed through the pump discharge orifice when the pump is not in operation and prevents the suction in the throat of the venturi from drawing fuel from the pump cylinder.

It is contemplated that other arrangements of elements than those shown in the accompanying drawings may be provided without departing from the scope of the present invention. Further, other elements may be incorporated in the carburetor and additional modifications of the main fuel and idle systems may be made to satisfy requirements.

I claim:

l. In an engine carburetor, an induction passage having an air inlety and a mixture outlet with a throttle valve therein, a venturi in said induction passage, a bar'extending across said venturi near the throat thereof, a pair of ears spaced from one another and from the Venturi '4 walls on the downstream side of said bar, a fuel well, a conduit connecting said well with the induction passage between said ears, and an idle system having a conduit connecting said well with the induction passage on the engine side of said throttle valve.

2. In an engine carburetor, an induction passage having an air inlet and a mixture outlet with a throttle valve therein, a venturi in said induction passage, a bar tapering toward the air inlet and extending across said venturi near the throat thereof, a pair of ears tapered toward the mixture outlet and spaced from one another and from the Venturi walls on the downstream side of said bar, a fuel well, a perforated sleeve in said well spaced from the side walls thereof, a fuel inlet near the bottom of said well, an air inlet near the top of said well, a conduit connecting said sleeve near the top thereof with the induction passage between said ears, and an idle system having a conduit connecting said well with the induction passage on the engine side of the throttle valve.

3. In an engine carburetor, an induction passage having an air inlet and a mixture outlet, a venturi in said induction passage, a bar extending across said venturi near the throat thereof, a pair of ears spaced from one another on the downstream side of said bar, a fuel well, a conduit connecting said well with the induction passage between said ears, an idle system having a conduit connecting said well with the induction passage, an antipercolating well in said idle conduit, a fuel inlet near the top thereof, a fuel outlet conduit extending downwardly into the well to a point near the bottom thereof, a power enrichment jet connecting a source of fuel with said idle conduit anterior to said last mentioned well, a valve for said jet, and an actuating means for said valve so constructed and arranged that said valve remains open while the engine is not running to provide communication between said antipercolating well and the source of fuel.

4. In an engine carburetor, an induction passage having an air inlet and a mixture outlet with a throttle valve therein, a venturi in said induction passage, a bar tapering toward the air inlet and extending across said venturi near the throat thereof, a pair of ears tapering toward the mixture outlet and spaced from one another on the downstream side of said bar, a fuel well, a perforated sleeve in said well spaced from the side walls thereof, a fuel inlet near the bottom of said well connecting the well with a fuel bowl, an air inlet near the top of said well, a conduit connecting said sleeve near the top thereof with the induction passage between said ears, an idle system having a conduit connecting said well with the induction passage on the engine side of the throttle valve, an antipercolating well in said idle conduit, a fuel inlet near the top thereof, a fuel outlet conduit extending downwardly in the well to a point near the bottom thereof, a power enrichment jet connecting said bowl 'with said idle conduit anterior to said last mentioned well, a valve for said jet, an actuating means for said 'valve so con structed and arranged that said valve remains open when the engine is not running to provide communication between said antipercolating well and the fuel bowl, and a tube forming a sectionrof the idle conduit disposed in the fuel bowl and adapted to be at least .partially surrounded by fuel.

5. In a carburetor, an induction passage having an air inlet and a mixture outlet, a venturi in said induction passage, a bar extending across said venturi near the throat thereof," a pair of ears spaced from one another and from the Venturi walls on the downstream side of said bar, and a conduit for connecting a. source of fuel with the induction passage between said ears.

6. In a carburetor, an induction passage having an air inlet and a mixture outlet, a venturi in said induction passage, a bar tapering toward the air inlet and extending across said venturi near the throat thereof, a pair of ears tapering toward the mixture outlet and spaced from'one another and from the Venturi walls on thedownstream side of said bar, and a conduit for connecting a source of fuel with the induction passage between said ears.

7. In a carburetor having an induction passage: an idle system comprising an antipercolating well, a passageway connecting said Well near the top thereof with a source of fuel, a conduit including a tube extending downwardly into said well to a point near the bottom thereof for connecting said well with the induction passage, a valve in said passageway, and an actuating means for said valve so constructed and arranged that said valve remains open while the engine is not running.

8. In a carburetor having a fuel bowl and an induction passage: an idle system comprising an antipercolating well, a passageway connecting said well near the top thereof with said fuel bowl, a conduit connecting said well with the induction passage and including a tube extending downwardly into said well to a point near the bottom thereof and having an inverted U-shaped portion disposed in said bowl, a valve in said passageway, and an actuating means for said valve so constructed and arranged that said valve remains open while the engine is not running.-

9. In a carburetor having a fuel bowl, a main discharge system, and an inductionpassage: an idle system comprising an antipercolating well, a passageway connecting said well near the top thereof with the main discharge system, a conduit including a tube extending downwardly into said well to a point near the bottom thereof for connecting said well with the induction passage, a passage connecting said passageway with said bowl, a valve in said passage, and a vacuum-actuated spring loaded means for holding said valve open while the engine is not running.

10. In a carburetor, a fuel bowl, an induction passage, and an idling system including a fuel passageway communicating with the fuel bowl and terminating in said induction passage, an inverted U-shaped tube vforming a segment of said passageway and arranged to have both legs submerged yin fuel, and a port in said tube near the upper portion thereof.

- ALBERT H. WINKLER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS