US1703982A - Carburetor - Google Patents

Description

March 5, 1929.

A. A. AYERS CARBURETOR Filed July 20, 192? INVENTOR LQLATTORNEYS.

Patented Mar. 5, 1929.

UNITED S ATES.

' ALBERT n. AYERS, or BAKERSFIELD, CALIFORNIA.

cannvnnron.

npplic atio'n flled m 20, 1927. Serial m. 207,133.

My invention. relates to carburetors ofthe V spray nozzle float feed type especially adaptvide means for automatically proportionin the fuel with respect to the air.

Another object of my invention is to provide-a carburetor which can easily be assembled and disassembled.

My invention possesses other advantageous, features, some of which with the foregoing will, be set forth at length in the following description where I shall outline in full that form of the carburetor of my invention, which I have selected for illustration in the drawings accompanying and forming part of the present specification. In said drawings I have shown one form of carburetor embodying my invention, but it is to be understood that I do not limit myself to such form since the. invention,

in aplur ality of forms.

In the drawings: p

Fig. 1 is a section thru the carburetor of my invention, the plane of section being vertical. 1

Fig. 2'is my invention can be constructed in a numberof different.

ways, Ipreferably buildv it as shown in the accompanying drawings. The carburetor body 6 is preferably of. castinetal and is formed with an integral, cylindrical float chamber 7 The bottom of thefloat chamber is tapped for a, reducer 8 into which is as set forth inithe claims, may beembodied screwed an elbow 9. connecting with l the source of fuel, not shown. The reducer is provided with avalve seat 11 cooperating with a conical valve 12 on a stem 13 passing" upwardly thru the float chamber and guided by the cover 1 1. On the stem 13 and preferably secured thereto by fingerslfl is a float 17. The float is usually a hollow metallic body apertured to receive the stem 13 aid is preferably affixed "to the friction fingers 16 so that thefloat isadjustable on the stem 13 and can be variously positioned to alter the fuel level within the float chamber 7. 'A removable cap 18 is screwed to the cover 14E and protects the projecting stem 13 from interference but allows it to be manually manipulated. T

. The weight of float li'is suflicient to keep the valve 12 from seating and permits the fuel to flow thru the elbow 9 into the charm her 7. When the fuel attains the selected height, the buoyancy of the float lifts the valve 12 against the seat 11 and cuts off further influx until u the level drops sufficiently'to cause thetunseating of valve12.' The level of gasoline within chamber 7 is thereby maintained given height.

friction approximately at ,a

Also formingpartof the carburetor body 6. is, an air inductiontube 19 preferably integralwiththe body and of generally cylindrical shape to surround an induction passage 21 communicating with an intake manifold 22 of the usual kind. I The induction passage 21 is preferably vertical andat its lower or inlet end is provided with an air horn 23 which is flared to facilitate the influx of air. The air horn can readily be detached from the body (i-by removing the clamp 24:. To control the entrance of. air to the induction passage, a butterfly valve .26

is mounted on a shaft 27 journaled in the horn, and is controlled by suitable means to vary. the amou'ntof restriction of thepasage v I u I Toincrease the velocity of the air entering in the induction passage and also to form a portion of a fuel well, I preferably provide aVenturi block 28 of annular form disposed within the induction passage. The

block is conveniently a metallic ring having its internal contour substantially that of a venturi, while externally it is provided with a peripheral flange 29 seated on a shoulder 31 formed in the body 6. Above the flange 29, the Venturi block is reduced in external diameter to enclose an annular fuel well 32 surrounding the induction passage 21. Communication between the fuel well 32 and float chamber 7 is by a passage 33 thru the carburetor body 6.

Preferably I provide a plurality of fuel nozzles for conducting fuel from the well 32 to be mixed with the air flowing in passage 21. The nozzles are usually tubes 34 of relatively large internal diameter which are closed at their upper ends by caps 36 having relatively minute aperatures 37 therein. The tubes are all seated in a nozzle ring 38 situated within the induction pas sage and forming a seal for the upper part of'the fuel well 32. A gasket 39 affords a fuel tight junction. The nozzles extend well down into the fuel well at their lower ends and at their upper ends preferably terminate in different planes. In one embodiment I have terminated more than half of the nozzles in a. plane just slightly above the normal fuel level in the float chamber 7 while the remainder of the nozzles are terminated in a plane considerably thereabove. The result of such an arrangement is that under normal operation of the carburetor at moderate speeds only the lower nozzles are active while as the speed is increased and the velocity of the inflowing air becomes greater, suflicient suction is exerted upon the higher nozzles and gasoline is withdrawn from them in addition to the lower nozzles. in this manner the mixture is somewhat enriched at higher air speeds thus improving the operation of the engine to which the carburetor is attached. lVhile I have shown the nozzles terminating in two planes, 1 can also terminate the nozzles in more than two planes, depending upon the conditions to be met. g

The velocity of air passingthe lower nozzles is materially increased and a more intimate mixture of fuel and air is afforded by an'air deflector 41 which usually 'COl11- prises a double cone of metal suspended withinthe air passage by attachment to'the nozzles, as by soldering, and preferably situated with its greater diameter in the plane of the lower nozzles. The cone is instrumental in gradually increasing the air velocity until it is a mum flowing by the lower nozzles and then uniformly causing the velocity to assume its normal value adj acentthe higher nozzles.

To retain the nozzle ring in place, I install a sleeve 42 within the induction tube 19.

The sleeve is generally cylinderical and fits within the tube with slight clearance. The

lower end of the sleeve bears upon a gasket 43 interposed between the sleeve and nozzle ring 38 so that a fuel tight joint is made. The sleeve 42 is urged toward the ring 38 by aflange 44 preferably shaped to conform to the contour of the manifold flange 46 and secured by screws 47 to a collar 48 surrounding the carburetor body 6. The collar is provided with a groove 49 in which a split ring51is situated which in turn engages a suitable groove 52 cut in the induction tube 19. A gasket 53 is interposed between the flange 44 and the collar 48 and when the screws 47 are tightened the collar abuts the split ring 52 and forces the sleeve 42 clownwardly thereby firmly retaining the nozzle ring 38 and the Venturi block 28 in position. Suitable bolts 54 secure the carburetor on themanifold 22.

For regulating the amount of mixture passed by the carburetor to the manifold, a butterfly valve 56 is disposed in the upper portion of the inductionpassage 21 and is secured to a shaft 57 journaled in the sleeve 42. The shaft is rotatedby manual means, not shown, and is received by a slot 58 cut in the induction tube 19. Rotation of shaft 57 variously restricts the induction passage 21 and regulates the quantity of combustible mixture passing from the carburetor into the manifold 22.

On the side of sleeve 42 adjacent the edge of the butterfly valve 56 when it is nearly closed, is a boss 59 received in a slot 61 in the induction tube 19 and provided with a passage 62 to form an idling nozzle. The passage 62 is supplied with fuel thru a tube 63 having its lower end in communication with passage 33 and its upper end seated in a reducer 64 screwed into theboss 59. Com munication with the upper end of tube 63 is afforded by a plug 66 in alinement with the upperend of the tube while aplug 67 affords access to the lower end thereof. 1

My carburetor not only affords a properly proportioned combustible mixture for all speeds of inflowing air but it is also easily assembled and disassembled. The carburetor can easily be taken apart after it is removed from the manifold 22 by removing the flange 44 and lowering the collar 48. After the sleeve 42 is extracted, the nozzle ring can be withdrawn with its assembled nozzles and air deflector, and the Venturi block can be withdrawn. The entire carburetor is thus simply taken apart and can be as easily assembled.

I claim:

1. A carburetor comprising a body having an induction passage therein, a plurality of nozzles arranged in a circle within-said passage, and 'a conical air deflector supported by said nozzles.

2. A carbuetor comprising a body having a vertical induction passage therein, aring disposed in said passage, a plurality of verringand extendin from said well into said tical nozzles secured to said ring, and an air passage, and a conical air deflector supported I deflector supported by said nozzles. in. said passage by said nozzles. 10

3. A carburetor comprising a body having In testimony whereof, I have hereunto 5 an induction passage therein, a fuel Well set my hand.

surrounding said passage, a ring sealing said Well, a plurality of nozzles secured to said ALBERT A. AYERS

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