US2007474A - Carburetor - Google Patents

Description

-' July 9,1935.

Filed March 23, 1933- 2 Sheets-Sheet l ATTORNEY A. J. ME TZ CARBURETOR July 9, 1935;

Filed March 23, 1933 2 Sheets-Sheet 2 IN VEN TOR A. d. METZ BY I FIE"? W Pat ent e'cl July 9, 1935 PATENT 'oFF-I E j cAn'BURE'roR Anthony}. Meta; Davenport, Iowa, assignor of one-half to J. R. Porter, Davenport, Iowa.

' Application March 23, 1933, Serial No. 662,267

' ,11 claims, (01. 261'72)- The present invention pertains to improvementsin jcarburetors and more particularlyto the securing "of greater efficiency in the operation thereof. Among the objects of .thisinvention are to provide a carburetor which is so constructed that a minimum amount ofthe gasissuing from the fuel nozzle will come in contact withthe "throttle valve [and be condensed thereby into liquid form; -to provide an improved carburetor which isso constructed that just enough gasoline will be provided when the engine is idling to take care of the gas needed for this plurposegthe same beingcapable of supplying, as needed, all the fuel requisite for higher speeds; to provide an improved carburetor in which the air and gasoline required for idling speed of the engine will be injected into a venturi lto be thoroughly co-"ningled; to provide animproved carburetor in which substantially 'all ofthe fuel delivered foroperation'of the engine will be kept out of contact with thethrottle valve; and" such further objects, ad-

vantages," andcapabilties aswill hereafter appear and as are inherent in the construction disclosed p. herein; My'inventionjfurther resides in the com- 5 bination; construction; and arrangement ofparts illustrated in the accompanying drawings and,

while I have shown therein two differentembodiments of this invention; I desire it understood 1 that. these are merely illustrative and are not to be interpreted in'a limiting sense.

In the drawings annexed hereto a part hereof, H 11 c V Fig; its a plan view of on'e form ofmy improved carburetor; n

Fig. 21s a vertical, substantially central section taken approximately alongthe plane indicated by theline2'2,Fig.l; v, I Fig. 3 is a transverse section taken'substantially along the plane indicated "by the line 3,-3,

and forming Fig.l; Fig. 4 a transverse sectiontaken substantiallyalong the'planeindicate'd by the line 4-4, Fi 1 Fig. 5Iiisa fragmentary vertical longitudinal section taken substantially along theplaneindi- 'cated by the line 5'---5, 1-"ig. 4;

form of, construction embodying my presentinvention; f

fFigj'? is a vertical longitudinal. section of the structure shown" in Fig. 6 and corresponding in general to the section shownin Fig.2;- ij A I Fig. 8 is a vertical transverse-sectiontakensub- 1. stantially along the plane indicatedby the line Fig; 9 is-a transverse section taken in the plane 'of'the line 9--9, Fig. 8.

Reference will now be made in greater detail to the annexed drawings for a more complete de scription of my invention as disclosed therein. The bowl I and float Z'may be of 2 any conven tional type. However, I provide, on the cover 3 a species of boss t Whichis hollow as indicated at 5 This hollow space is connected at one side with the float'chamber and at itsfopposite side with an air channel 6 which leads to an opening 'i at a point beyond the choke valve 8. This permits air to freely enter the channel 9 leading upwardly from the channel 6 to'the airvalve I0.

Suitable means II, shown as a bolt having a frusto-conical point, is provided for adjusting the- .size of the openingat It! for theregulation of the amount of air passing through the opening. Resilient means I2 is provided which is intended to hold the bolt 'II in adjustedposition. A tube I3 is mounted in the bottom of the. carburetor and has connection, as shown in Fig; 3, with the air valve passage I Il,- thuslproviding an adequate supply of air for the idling of the e'nginewhen the valve I I is closed, As shown in-Fig.p3," *a' screw-threaded plug I5 may be screwed into'an opening in the side of the lower portion of the carburetor arid may have a pointwhich extends into an opening in the pipe I3 to properly position that pipe. Opposite this screw plug isfan opening-in the bottom portion of the pipe I3 which. registers. With-the air valve It so that proper passage of air will always be assured. At its upper end, the pipe or tube I3 has a par- .tially .cylindrical hea'd; I8) .as' shown in Fig." 2. This has an opening I I therethrough which communicates withthe opening in the pipe and which directs thewair and gasoline mixture into the .venturi I8, located abovev the valve I4.

Spindles I9 and 2Ilsupport the valve plate I4 forpartial rotation aboutlthe headv It, between theftwo positions shown in full anddotted lines in Fig. 2. 'Any suitable or "usual throttle valve 1 I "position. v: ,Fig. 6 isa planview'similar to Fig. 1 of another 7 An opening :2! leadsifrom the fioat'chamber and connects with the various fuelnozzles for supplying fuel f or the operation of the motor.

One of the tubes connected with'this opening? I is indicated by the numeral 22 and this ends just below theheadlfi of pipe; I3. throughthe center of which the pipe' 22 extends. It will beseen from this'that a supply or air passes upwardly 5.5.

through tube I3 around tube 22 andacts todraw the fuel from the latter tube in the manner of an aspirator. This mixture of air and fuel passes outwardly through the opening I l and is directed into the venturi I8 where the mixture is thoroughly co-mingled without contact of the fuel with any metal part after leaving the tube 22.

Other openings in the body of the carburetor, communicating with the opening 2|, have tubes 23 and 24 mounted therein and serve to furnish additional fuel required for the running of the motor vehicle. Tube 23, being located more directly in the air current passing through the carburetor, is affected more strongly than the tube 24 and therefore begins sooner to supply.

fuel after the valve I4 is open. As the valve is open farther, the engine runs faster and creates a greater suction, causing a stronger air current to flow through the carburetor and fuel is then drawn through the tube 24 to supply the required additional fuel for the higher speeds. It will be seen. from Fig. 2 that, when the valve 14' is opened, the fuel sprayed through the pipes 23 and 24 is not directed against any metal part but into the air current passing through the carburetor and this fuel is therefore not condensed into liquid formbut is mixed in the venturi with the air passing therethrough.

The structure shown on Sheet 2 of the drawlngs differs from that shown on Sheet 1 in certaln particulars due to the fact that this structure is designed for the use of a poppet valve type of throttle valve instead of the butterfly type. In this construction, a supporting tube 25 is rigidly mounted in the base of the carburetor and has slidably mounted therein a tube 26;provided externally with a flange 21 and having adjacent its upper end a valve head 28 which cooperates with the lower end portion of theVenturi tube l8. Surrounding the tubes Hand 26 and pressing against the flange 21 and the bottom of the carburetor is a coiled spring 29.which serves to hold the valve closed, unless forcibly opened.

The upper end of the tube 26 is constricted, as shown at 30, to form a jet through which the air entering through valve "land the fuel entering through pipe 22 are injected into the venturi 18;. It will be apreciated that when the valve 28 is closed, the suction of the engine will draw the air and fuel through these pipes in sufficient quantity to keep the engine idling. When it is desired to make the engine run faster, it is necessary to open the valve28 and admit a greater supply of air and fuel and this opening of the valve is accomplished in the following manner.

The customarythrottle valve opening means is connected to the shaft I! which has a cam 31 projecting from one side thereof, as shown in Fig. 9. This cam engages a valve operating member 32 having a guide pin 33 upon its lower surface. Rotation of the shaft l9 therefore pushes member '32 downwardly, forcing pin 33 through the opening 34, as indicated in Fig. 8. Rising from member 32 is a part 35 which has a laterally extending fork 36 at its upper end, which fork straddles the pipe 281and rests upon the flange 21. Therefore, when the cam 8| presses downwardly upon member 32, flange '21 and pipe 26 are caused to move downwardly with resulting compression of the spring 28. As the valve 28 is opened, 'airpassing through the carburetor main air intake passes pipe 38 which communicates with the opening 2! fromthe float chamber and causes asuction on the fuel in thispipe. The result is that this fuel is aspirated from the pipe and passes with the air between the valve 28 and venturi la, the air and fuel being thoroughly intermingled in the venturi without the fuel coming, to any great extent, in contact with metal. This reduces the amount of condensation of the fuel to a minimum, thereby increasing the efliciency of the apparatus. When the shaft I9 is rotated in the opposite direction, the spring 29 causes closure of valve 28 and the air and fuel for keeping-the engine running then pass through pipes 22 and 26, as heretofore described.

It will of course be understood that the spec-ific description of structure set forth above may be departed from without departing from the spirit of this invention as set forth in this specification and the appended claims.

Having now described this invention, I claim:

1. A carburetor having a venturi, a throttle valve located below the venturi and in a position to admit air and fuel mixture to the venturi, a nozzle positioned below the venturi and so that when the valve is opened the fuel from the nozzle willnot strike the valve and be condensed, a main air supply furnishing air to'the carburetor, and a second nozzle located in therethrough. I

2. A carburetor comprising a venturi, a main air inlet, a throttle valve located between the air inlet and the venturi, an auxiliary air inlet leadthe path of the air ing through the throttle valve, a main fuel nozzle below the throttle valve and in such a direction that the fuel leaving" the nozzle will not be condensed by striking directly against metal.

4. A carburetor comprising a venturi, a main air inlet, a throttle valve located between the air inlet and theventuri, an auxiliary air inlet leading through the throttle valve, and an idling fuel nozzle delivering fuel 'mto the auxiliary air intake between its two ends, the throttle valve being pivotally mounted about the delivery end of the auxiliary air inlet.

5. A carburetor comprising a venturi, a main air. inlet, a throttle valve located between theair inlet and the venturi, an auxiliary air inlet leading through the throttle valve, and an idling fuel nozzle'delivering fuel into the auxiliary air intake between its two ends, the throttle valve being slidably mounted and the fuel nozzle in the main air inlet being bent laterally to deliver the fuel above the throttle'valve when the latter is opened.

6. A carburetor having a float chamber, a main 1 air inlet, aven'turi'connected to the. main airinlet, an auxiliary air inlet connecting the main air me let with the upper portion of the float chamber, a series of fuel nozzles arranged in the main air stream below the venturi, and a fuel channel means for adjusting the effective opening of the auxiliary air inlet to vary the rate of speed of fuel for the idle running of the engine, the nozzle for furnishing the fuel for idle running of the engine being located substantially centrally of the main air stream.

8. Ina carburetor having a venturi, a fuel nozzle having its delivery end below the most constricted part of the venturi, a tube, independent'of the venturi, surrounding said nozzle in close proximity thereto to carry air around andbeyond the nozzle before-delivery of the fuel to the ven- I turi, means to feedfuel to the nozzle and air to said tube; and a second fuel nozzle in thevpath of the main air supply of the carburetor;

V 9. In" a carburetor having" a venturi, a fuel rounding the end portion of the air tube in such relation thereto as to substantially prevent passage of air around the air tube when the valve is closed, means to feed fuel to the nozzle and air tosaidtube, and a second fuel nozzle in the path of the main air supply of the carburetor.

10. In a carburetor having a venturi, a fuel nozzle having its delivery end below the most I constricted part of the venturi, a tube surrounding said nozzle in close proximity thereto carry air around and beyond the nozzle before delivery of the fuel to .the venturi, means to feed fuelto the nozzle and air to said tube, a secondfuel nozzle in the path of-the main air supply of the carburetor; and a throttle valve surrounding the end portion of the air tube and pivotally mounted with relation thereto.

11. In a carburetor having a venturi, a fuel nozzle having its delivery end below the most constricted part of the venturi, a tube surrounding said nozzle in close proximity thereto to carry air around and beyond the nozzle before delivery of the fuel to the venturi; a throttle valve surrounding the end portion of the air tube and slidably mounted with relation to the fuelnozzle;

means to feed fuel to the nozzle and air to said tube, and a second fuel nozzle in the path of the main air supply of the carburetor. v

, ANTHONY J. METZ.

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