US2742271A

US2742271A - Carburetor of the air displacement type

Info

Publication number: US2742271A
Application number: US404347A
Authority: US
Inventors: Harry W Mcclain
Original assignee: Individual
Current assignee: Individual
Priority date: 1954-01-15
Filing date: 1954-01-15
Publication date: 1956-04-17
Anticipated expiration: 1973-04-17

Description

April 17, 1956 H. w. M CLAIN 2,742,271

CARBURETOR OF THE AIR DISPLACEMENT TYP E Filed Jan. 15, 1954 40 14 7 1: 64mm M flaw/v.

: fcnnnunnrnncn rin -am nispmcnmnnr TYPE W.Mclain,L"ong Beach, Calif.

apnlierfionranuary rs, 19 s4,'senaiNo.1104,347

2 Claims. (Cl. 261-44) vele'eitv astne an nters 'theparburetor. Thisallows fo'r aeenrateana *e'x' t ring. V

eatiire nay-mention is to provide "a novel carbiir'etor bf-the character stated in which air-enters on both *Sidfif the" hell or baibilrbtbr, the an entrances being airstrip-apprised to e h other, thus the same air'pressu're oth sides at the vacuum-cone. ject "of an invention "is to "provide a; novel ahns fidviiigth'e cone upwardly by differential .air pres- 'tne'fr eb'ject array invention is to previne a 'nevel "in an sbf feiing rue intotlre'carburetqr thrbngh a'drilled a ngynns fring being'forrned with a lip onthe *duteredge everthe' air passes, husnrawing-the fuel through the rlrilledflhols on the inside of the ring. The vaeuumcup sets directly above the fuel ring and the incoming f 'UnitedStates atefi n th racters'tated in which the capacity 2,742,271 Patented Apr. 17:, 1956 I Figure 7 is a fragmentary vertical sectional view showing the means .of controlling the air to the fuel needle.

Figure 8-is aside elevation of my car-buretordllustrating theair intake from opposite sidesthereof.

Referring more particularly to the drawing, an intake pipel is provided with the usual mounting flange-2, so

that the carburetor may be attached to the intake manifold of the enginein the usual and well knowntmanner. The pipel .extendsinto the bottom ofa cylinder 3 which is considerably larger. in diameter than the pipe 1-. EA throttl'e valve 4, of usual and well known desigmfis mounted in the pipe 1, and this throttle valve is rotated manually by the operator of the engine, all of Whichfiis usual and well known. The throttle 4 is fixedlymounted on, or'is an integral .part of the shaft 5 which is Fjou'rna-led in the .pipe 1, and also protrudes from this pipe, as shown in Figure 8, and for apurpose which will be subsequently described. Twoair intake pipes 6 and 7 ext-endintoeach side of the cylinder 3, and these air pipes are directly :opp'osed and are substantiallyhorizontal. The air intake pipes f6 and 7 admit'air into the cylinder 3, and this air is controlled and eventually finds its way into the pipe 1 and thence into the manifold of the engine. A frustro conical v'alv e .-8 tis slidably mounted within the cylinder 3, the narrow portion of this valve being pointed downwardly, andan annularflange 9 is formed on the lower end of the frustro conical valve and projects downwa-rdly.

A packingring 10, on the upper .part of the valve'8,-packs ofl againstzthe inside of the cylinder 8 and thus seals the space betweenwthe valve andthe cylinder.

.post II risesfrom-the valve 8'and is =guided in1he top .or cover: 12 of the cylinder 3. The post1-1 thus guides the valve accurately in its vertical movement and also fuel is moved upwardly and inwardly creating a sheet of atomizedfuel ever *the main throat; "or "the "carburetor;

which is theii arawn downwardly by the air stream and into the manifold. g p

(Another feature of my invention :is tosprovidetheinetr- :ing needl e on the, outside of the carburetor where this :unafiected ,rby internal temperatures of the carburetor, and also no fuel will flood into the carburetor due to leakage of the niete'iingnedl. p V, p r Andther tibject of my-invention is to provide a -'complete atomization of fuel and a thorough mixing with air before the fuel mixture reaches the intake manifold. This feature of the carburetor prevents precipitation and fuel lag and provides a more uniform distribution of fuel to all of the cylinders. Other objects, advantages and features of invention may appear from the accompanying drawing, the subjoined detailed description and the appended claims.

In the drawing:

Figure 1 is a vertical sectional view of my carburetor.

4 Figure 2 is a top plan view of the metering needle control and adjustment. V

Figure 3'is a fragmentary vertical sectional view of the lower part of the meterin'gneedle.

Figure 4 is a top plan view of the fuel ring. Figure 5 is" an enlarged fragmentary sectional view taken on line 55 of Figure 4.

Figure .6 is'a fragmentary side elevation of the carburetor showing the air control for the fuel needle.

'- vthe -1 ing=1;'7. and air, in passing ehorizontal'ly over 'ihii'sitlip, -will create -a pantialvacuum on-the inside ctr-hemp, thu's acts to nieter the fuel through a metering :needle, 'aswill be subsequently described. A fuel bowl 13 is mounted onf th'e outside of the cylinder 3 and -is provided with 'the usualfiiiloat valve 14 to control the flow of .fuel into :the

bowl. T vertical .passage :15 withinthe bowl extends to a fuelduct 16 in the bottom wall of the cylinder 3; A fuelringjll is fixedly-mountedin the lower wall-ofthe cylinder. and directly above the pipe 1, as shown in Figure 1 fuel ring includes an external "annular rgroo've .18 .into which the duct .16 extends.

' a A plurality of jet holes .19 extend upwardly from the :groove 18 and :adimt fuel to the spacebelow the valve 8 and witliin the an nularflange- 9. lip 20 iiszprovided on the 'outside of Edrawing fuel upwardly through the er nere s 19 thus forming a sheet of atomized fuel "horizontally i across the rap of the pipe 1- and rthe incdniin g air 'th'en 's'trikes{tltiis 'isheet pf atomized :tuel "and carries it "downwardly "into the engine manifold. A tube 21 screwsinto the top of the fuel bowl 13 and the-lowerend of this tube is provided with holes 22 which are in alignment with the duct 16, asshown in Figure 3. V

A fuel needle 23 extends into the tube 21 and vertical movement of this needle will permit fuel to pass upwardly from the fuel passage 15 and thence into the duct 16,

where it feeds to the ring 17. The needle 23 is secured v to the post 11 by means of the bracket 24, which bracket is secured at one end to the post 11 and at the other end to the needle 23. To enrich the fuel, an ahrens cable 25 is attached at one end to a lever 26, the lever 26 is pivotally secured at 27 to the bracket 24, and the free end of the lever extends under the cap 28 on the needle 23, thus lifting the needle to enrich the fuel mixture when the ahrens cable 25 is pulled downwardly. A spring 29 may be provided between the ahrens cable and the lever 26.

air bleed is provided to the holes 22 and consists of tanair passage 30 in the wall of the bowl 13, which is open at the upper end and extends into the holes 22 at the lower end. The upper end of the passage 30 is opened and closed by a cover 31 on an arn'1 32 whichextends from a ring 33 on the shaft 5. The arm 32 is so'positionedthat when the throttle 4 is closed the cap 31 closes the passage 30. As soon as the throttle'is open, however, the passage 30 is open and air can pass into the holes 22, thus permitting fuel to be drawn freely into the duct 16 and thence to the fuel ring 17.

The reciprocation of the pistons in the'engine creates a vacuum and this vacuum is transmitted to the space 34 above thethrottle 4 as soon as that-throttle is partly open.

therefore, cause the valve to move upwardly due to atmospheric air pressure below the valve, or within the cylinder 3 in the space 36 into which the air intakes 6 and 7 extend. The upward movement of the valve 8 will move the flange 9 upwardly, thus exposing the fuel holes orjets 1 9, permitting fuel-to enter through the ring 17,

and incoming air under atmospheric pressure over the lip'20 will draw the fuel horizontally and inwardly, thoroughly admixing the fuel and air and causing considerable turbulence so that the air and fuel is completely admixed before-the fuel mixture enters the manifold.

- In operation the needle 23 is normally down so that will rise due to the atmospheric air pressure in the space 36. As soon as the valve 8 moves upwardly the needle 23 is also raised, and fuel llows through the holes 22,

thence through the duct 16 and into the ring 17, and

thence through the various jet holes 19. The movement of the incoming air over the lip 20 will cause a sheet of atomized fuel to be spread across the top of the pipe 1, and this atomized fuel is then moved downwardly with the incoming air and thoroughly admixed therewith.

: Having described my invention, I claim: I

. 1. A carburetor comprising a cylinder, a pipe depending from the cylinder, at throttle valve in the pipe, a pair of air intake pipes extending into the side of saidcylinder,

said intake pipes being diametrically opposed and above said first named pipe, a frustro conical valve slidably mounted inthe cylinder in axial alignment with the first named pipe, the base of said frustro conical valve slidably engaging the wall of the cylinder and the apex of the frustro conical valve extending downwardly, a wall closing the lower end of the frustro'conical valve, said wall having aholeextending therethrough to permit evacuation of the space above the frustro conical valve,a post .rising from said frustro conical valve and? extending through the upper wall of said cylinder, said post being journaled in the upper wall, a fuel chamber, a fuel ring mounted in the cylinder between said pipe and the lower end of the frustro conical valve, said cylinder having a fuel duct therein extending from the fuel chamber to said ring, said ring having fuel jet holes therein, a needle valve extending into said fuel duct and controlling the same, a bracket projecting from said post, means slidably mounting said needle valve on the bracket, a lever, said lever being pivotally mounted on the bracket, one end of said lever engaging the needle valve 'to adjust said needle valve vertically in the fuel duct, and manually operable means extending to the lever to swing said lever on its pivot. Y

2. A carburetor comprising a cylinder, a pipe depending from the cylinder, a throttle valve in the pipe, 21 pair of air intake pipes extending into the side of said cylinder, said intake pipes being diametrically opposedand above said first named pipe, a frustro conical valve slidably mounted in the cylinder in axial alignment with the first named pipe, the base of said frustro conical valve slidably engaging the wall of the cylinder and the apex of the frustro conical valve extending downwardly, a wall closing the lower end of the frustro conical valve, said wall having a hole extending therethrough to permit evacuation of the space above the frustro conical valve, a post rising from said frustro conical valve and extending through the upper Wall of saidcylinder, said post being journaled in the upper wall, a fuel chamber, a fuel ring mounted in the cylinder between said pipe and the lower end of the frustro conicalvalve, said cylinder having a fuel duct therein extending from the fuel chamber to said ring, said ring having fuel jet holes, therein, an annular lip extending upwardly from the ring, saidholes being on the inside of the lip, an annularfiange depending from said frustro conical valve and positioned above the lip to engage said lip in one positionof the frustro conical valve, a needle valve extending into said fuel duct-and controlling the same, a bracket projecting from said post, means slidably mounting saidneedle valve on the bracket,

' a lever, said lever being pivotally mounted on the bracket,

one end of said lever engaging the needle valve to adjust said needle valve vertically in the fuel duct, andmanually operable means extending to the lever to swing said lever on its pivot. .1

References Cited inthe file of this patent p UNITED STATES PATENTS 1,441,992