US1500647A - Carburetor - Google Patents

Description

.uy 8, 1924. 1,500,647 A. SHACKLETON ET AL CARBURETOR Filed Sept. 27 1920 3 Sheets-Sheet l 2K4 'N N,

`uly 8, 1924. 1,500,647

A. sHAcKLr-:TON ET A1.

CARBURETOR Filed Sept. 27 1920 3 Sheets-Sheet 2 July s, 1924. 1,500,647

A. SHCKLETON ET AL CARBURETOR Filed Sept. 27. 1920 3 Sheets-Sheet 3 Patented July 8, 1924.

ALFRED SI-IAGKLETON AND'NILS RYERSEN, OF CHICAGO, ILLINOIS.

GARBURETOR.

Application filed September 27, 1920.

T all whom t may concern.'

Be it known that we, ALFRED SHACKLETON and NILs RYERsnN, citizens of the United States, and residents of the city of Chicago, in the county of Cook and State of Illinois,

have invented certain new and useful Improvements in a Carburetor; and we do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the numerals of reference marked thereon, which form a part of this specification.

This invention relates toa carburetor, and particularly to a carburetor wherein positively operated means are provided for controlling the admission of fuel and air in the proper ratios and quantities to afford an eiiicientexplosive mixture. It is well known that there exist definite ratios in which fuel and air should be mixed in the carburetor of an internal combustion engine in order that the same may operate in the most efficient manner.

Many attempts to accomplish this have resulted in complicated structures which have operated efliciently only under certain conditions of engine speed and load.

The present invention appertains to that class of carburetors in which a mechanical movement connects the air control and the arrangement for controlling the supply o f fuel so that a proper ratio between the two is maintained. i

It is an important object of this invention to provide a carburetor having improved positively operated means for controlling the admission of fuel and'air to form an eflicient fuel mixture and having a non-restricted outlet passage for said fuel mixe ture.

It is another object of this invention to provide a carburetor having its parts so arranged that the instrument, as a whole, is 45 long and narrow and has no projections extending very far sideways. y

@ther and further important objects of this invention will be apparent from the disclosures in the specification and the accompanying drawings. Y

The invention (ina preferred forni)` is Serial No. 413,024.

shown on the drawings and hereinafter more fully described.

On the drawings:

Figure l is a side elevation of a carburetor embodying the principles of this invention.

Figure 2 is a top plan view of the same.

Figure 3 is an end elevation looking at the air inlet of the carburetor.

Figure 4 is a. section on the line 4 4 of 60 Figure 2, with parts shown in elevation.

Figure 5 is a section on the line 5 5 of Figure 1.

Figure 6 is a section on the line 6 6 of Figure 4. G5 Figure is a section on the line 7 7 of Figure 4.

Figure 8 is a slightly enlarged fragmentary section on the line 8 8 of Figure 4.

Figure 9 is an enlarged detail section 70 showing the fuel control means.

As shown on the drawings:

The carburetor of this invention comprises a unitary casing in which is formed a float chamber 1, a mixing chamber 2, an air chamber 3, a mixture outlet passage 4, and an air inlet passage 5. Said air inlet passage 5 is adapted to be connected with any suitable source of air supply by means of aconnection 6, while an apertured flange 7 is formed on the carburetor casing outside the mixture `outlet for connection with the intake manifold of an engine on which the carburetor is mounted. Liquid fuel from a suitable source of supply is conducted into the float chamber l through a. connection 8 inthe bottom thereof and a suitable float mechanism in said float chamber controls the flow of fuel from said passage 8 into the float chamber to maintain the fuel therein at a constant level in a manner which is well known in carburetor construction. Extending transversely of the carburetor casing between the mixing chamber 2 and the air chamber 3, is an integral member 9 in 95 which is A centrally supported a passaged nozzle member l0, which is secured in posi tion in said member 9 by a nut 11 engaged on a threaded portion on the lower end thereof. Said nut 1l engages the under side 100 of the member 9 and since an enlarged portion l2 of the tubular member 10 engages the upper side thereof, the tightening of said nut 11 acts to secure said nozzle member in position in the member 9. The liquid fuel is supplied from the float chamber 1 to a central passage 14 in said nozzle member 10 through a passage 13, which communicates with the float chamber and extends through the member 9 to a restricted passage which extends transversely from the bottom of the passage 14. Said passage 14 extends upwardly through the member 10 and opens into a tubular passage which extends transversely through an enlarged portion 16 on the upper-end of said member 10. To afford communication between the tubular passage in said member 16 and the mixing chamber 2 so that liquid fuel may be introduced into said mixing chamber, a tapered outlet nozzle passage 17, the smaller inner end of which communicates with said tubular passage, is provided.`

Means are provided for governing the amount-of liquid fuel introduced into the mixing chamber 2 through the nozzle outlet passage 17. For this purpose ashaft 13 is journalled in the transverse tubular passage in the enlarged portion 16 of the member 10, being positioned and secured therein by means of plates 19 and 20, which are secured to opposite faces of said enlarged portion 16. Said shaft 18, which is rotatably mounted in the tubular passage in the member 16 serves to entirely close the same and in order to provide regulable communication between -the upper end of Vthe passage 14 and the inner end of the nozzle outletY 17, a groove 21 is provided in said shaft 18 extending nearly around said shaft and, as shown in Figure 9, increasing in cross-sectional area as it extends around the shaft in ay counterclockwise direction.

Figure 9 shows the shaft 18 in such position that thesmallest amount of liquid fuel is allowed to be drawnoutwardly through the nozzle outlet passage 17. Since, however, the groove 21 in Ysaid shaft 18 increases in crosssectional area as described heretofore, the rotation of said shaft 18 in a clockwise di,-

vrection will serve to successively bring larger explained below. A reduced portion 22 ofthe shaft 18 extends outwardly through the plate 20, through the carburetor casing, and is `journalled in a boss 23 on the outside of said Ycarburetor casing. Nonerotatably secured on the outer end of said reduced extension shaft 22 is a bevel pinion 24 which meshes with a bevel gear 25 rotatably mounted on the upperend of a stub shaft 26 secured in the `carburetor casing above the air inlet passage 5.

A mechanism is provided for regulating 'f ing transversely of said tapered passage at the end thereof adjacent the air chamber 3. Centrally supported in said transverse member29 is a shaft 30 and mounted on said shaft 30 in the air inlet passage 5 is an en larged extension 31 of said shaft 30 which abuts the outer side of the member 29 andhas an enlargement 31EL formed on the outer end thereof. A nut 32 is engaged on a Y threaded portion of said shaft 30 which extends into the air chamber 3V and consequently a tightening of said nut will draw the end of the extension 31 against the transverse member 29 in the air inlet passage 5 and thus said extension 31 and shaf-t30 will be held securely inV axial position vin the air inlet passage 5. For controlling the flow of` air through the taperedpassage 28, a valve` is slidably mounted on the extension 31 and said valve 33 is inter-connected with the operating mechanism for the shaft 22 and adapted to be manually controlled therewith in a mannerwhich willpnow beideL scribed.'

Pivotally connected' on' each side of a sleeve 34 integral with and extending outwardly from said valve 33 'are links 35, and the outer ends Of saidlinks 35 arein turn connected with` theendsf of aVv bifurcated member 36, the other end of which is nonrotatably secured 'to a sha-ft 37 which is pivoted transversely'of the carburetor casing in a boss 38, as clearly shown in Figures 1, 2and 4. -A crank arm 39 is secured to the outer end of said shaft 37 andpivotally coninected to the outer end ofsaid crank arm is one end of a link 40, and the other end of lsaid link 40 is pivotallyi connected to a vertically extending angle pin which'is secured to a sleeve 42 mounted beneath and rotatable with the bevel Agear 25. Thus it is apparent that a rotation of 'said sleeve 42 and the' bevel gear 25 thereon causes a ro- Y tation of the reduced shaft 22 whereby the sleeve 18 is rotated and thesupply of liquid fuel flowing outwardly from the `passage 17 is increased or diminished, and also causes a rocking of the 'bifurcated rnember L36 about the shaft 37 whereby the air valve 33 is moved inwardly or outwardly along the Sleeve 3l t0 isere/ase or diminish the amount der that this rotationof the sleeve 42 may be manually effected, a vertically extending angle pin 43 similar to the angle pin -41 is secured to said sleeve opposite said angle pin411and pivotally connected to said piu 43 is a rod 44, which connects the sleeve 42 to a suitable manual actuatingmeans such as a foot orhand throttle lever. To facilitate carburation and the startingof the engine on which the carburetor is mounted, especially during cold weather, an electric heating element 45 is provided. Said heating element 45 is positioned in the air chamber 3, as clearly shown in Figure 4, and is adapted to be connected with a suitable source of electric energy, such as a storage battery, by means of insulated terminals 46 and 47 leading outwardly therefrom through a plug 48, which is removab-ly secured in the carburetor casing in the floor of the air inlet chamber 3.

The operation is as follows:

As heretofore described, liquid fuel enters the passage 14 in the tubular nozzle 10 through a restricted passage 15, which communicates with a passage 13 in the member 9 leading into the bottom of the carburetor float chamber. When the engine on which the carburetor is mounted is idling, the shaft 18 is in such a position that the groove 21 therein is in the position shown in Figures 6 and 9 and consequently a limited amount of fuel is introduced into the mixing chamber 2. The proper amount of air to be mixed with the fuel introduced during idling is received in said mixing chamber from the air chamber 3, having entered said air inlet chamber around the edges of the slidable air valve 33 which is in closed position when the engine is idling. When it is desired to increase the speed of the engine a pull is exerted on the rod 44 whereby the sleeve 42 is rotated and the rotation thereof is transmitted t0 the shaft 18 through the bevel gear 25 and the bevel pinion 24 in the reduced shaft 22. This rotation of the shaft 18 is in a clockwise direction and acts to bring a larger cross-sectional area of the groove 21 therein into effective position to aii'ord communication between the fuel passage 14 and the nozzle outlet passage 17. Simultaneously with the rotation of said shaft 18, the rotation of the sleeve 42 is transmitted to the link 40 and acts to rock the shaft 37 through the crank arm 39 whereby the lower end of the bifurcated member 36 on said shaft 37 is moved outwardly and the air valve 32 which is connected thereto by the links 35 is also moved outwardly allowing additional air to enter the air chamber through the tapered passa e 28.

t is thus apparent that due to the simultaneous regulation of the amount of fuel and air which are allowed to enter -the mixing chamber 2, it is possible to introduce at all times into said mixing chamber the proper proportion of air and fuel to afford an efficient combustible mixture. Since this ratio is not a constant one the proper compensation is provided by the particular construction of t-he groove 21, bythe tapered air passage 28 in the casing 27 and by the ratio between the bevel gear 25 and the bevel pinion 24. The relation between these three variable regulating means is so arranged that with the opening of the throttle, i. e., with the rotation of the sleeve 42, sufficient quantities of fuel and `air are supplied to the mixing chamber 2 to afford at all times the proper amount of a fuel mixture to operate the engine on which the carburetor is mounted at the highest efficiency.

We are aware that numerous details of construction may be varied through a wide range without departing from the principles of this invention, and we therefore do not purpose limiting the patent granted otherwise than necessitated by the prior art.

'We claim as our invention:

1. In a carburetor, a mixing chamber, means for admitting air thereto, an upright standard in said chamber having a cavity therein, a fuel supply conduit leading to said standard, a fuel duct leading through said standard from said conduit to said cayity, a round plug occupying said cavity, said plug having a groove therearound in position to register with said duct, the bottom of said groove forming a spiral concentric with said plug, a lug in said groove between the shallowest and deepest parts thereof contacting with the wall of said cavity, and a fuel outlet leading from said cavity to the top of said upright, whereby rotating the plug through nearly a complete revolution will change the delivery capacity of the standard from one extreme to the other.

2. In a carburetor, a mixing chamber, means for admitting air thereto, an upright nozzle in said chamber spaced away from the walls thereof, and a grooved shaft journalled in the nozzle transverse thereto for controlling the flow of fuel therethrough,

`said shaft also having a bearing in a wall of the mixing chamber.

3. In a carburetor, a mixing chamber, means admitting air thereto, an upright nozzle in the middle of said chamber, a float chamber, connections from said fioat chamber to the botto-m of said nozzle, a valve rotatable about a horizantal axis located in said nozzle near the top thereof and controlling the flow from Said fioat chamber into said mixing chamber, and a horizontal shaft extending through the wall ofthe mixing chamber and operating said stub Shaft rotatably mounted'on the airin- Valve. A v let Wall, and a horizontalV shaftzjournalled 4. In a carburetor, a Vertical mixing in the Wall of the mixing chamber. f chamber, a horizontalV air inlet, an air cham- In testimony whereof We have hereunto l bei` connecting said air inlet and mixing subscribed om: names inthe p chamber, a slidable air controlling valve subscrlbmg wltnesses.

between said air inlet and said air chamber, ALFRED'SHACKLETON.- a-'rotatable fuel controlling valve in said NILS RYERSEN. Y mixing chamber, and mechanism connect- Witnesses: i

10 ing said Valves for simultaneous opera- CARLTON HILL,

tion, said mechanism including a vertical EARL M. HARDINE.

resencc of two 1?'5`

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