US2775437A - Metering valve for a carburetor - Google Patents

Description

1956 J. E. BAKER METERING VALVE FOR A CARBURETOR 2 Sheets-Sheet 1 Filed Nov. 19, 1954 FIG. 1..

INVENTOR JAIME-S E. 52552,

ATTORNEYS yzawazq'pmm Dec. 25, 1956 J. E. BAKER 2,775,437

METERING VALVE FOR A CARBURETOR Filed Nov. 19, 1954 2 Sheets-Sheet 2 FIG. 2.

mvamox JAMES 5. 5455.9,

BY zgy/mpmm A9 ATTORNEY5 United tate This invention relates to a metering valve for a carburetor and has for its primary object toregulate the flow of fuel toan engine and to effect economies in engine operation. i

Another object is to prevent an oversupply of fuel to air entering the mixing chamber of a conventional carburetor andto. exactly proportion the supply of .fuel

to the air entering the mixing chamber in accordance with the velocity thereof. j I Still another object is to mechanically. alter the position of a fuel supply'valve in response to the increasing or decreasing velocity of air entering a carburetor throat on its way to the mixing chamber of the carburetor.

The above and other objects may be attained by employing this invention which embodies among its features a valve mounted in the air intake passage of a conventional carburetor adjacent the fuel intake port thereof, acounterbalance mounted within the mixing chamber and operatively connected to 'the valve for advancing it into closing relation to the: port,' and means mounted in the air intake passage of thecarburetor and operatively connected to thelvalveformoving said valve against the effort of the counterbalance in response to increasing velocity of air passing through said intake passage toward the mixingchamber of the carburetor".

Other features include yielding rneans carried by the carburetor and engaging the valve for holding said valve against the effort of the counterbalance, and said counterbalance \being responsive to increasing velocity of the mixture passing through 'the mixing chamber of the ice . 2 Figure 1 is a vertical sectional view through a carburetor embodying the features of this invention;

Figure 2 is an enlarged longitudinal sectional view taken substantially along the line 2-2 of Figure l; t

Figure 3 is a greatly enlarged detailed fragentary view of the fuel inlet port and valve taken substantially on the line 3-3 of Figure 2; I

Figure 4 is a horizontal sectional view taken substantiallyxalong the line 44 of Figure 1, showing the parts greatly enlarged;

Figure 5 is a horizontal sectional view taken substantially on the line 55 of Figure 3; and

Figure 6 is a horizontal sectional View taken substantially on the line 66 of Figure 3.

Referring to the drawings in detail, acarburetor designated generally 10 is equipped with a conventional float chamber 12 and float valve 14 which regulates the level of the liquid fuel entering the float chamber 12. Carried by the carburetor and extending upwardly and outwardly therefrom is a duct 16 having a liquid fuel discharge port 18 adjacent its end remote from the float chamber 12, the discharge end of said port being located above'the level of the fuel in the float chamber 12 and having a conically shaped valve seat 28 at its discharge end. The discharge port 18 islocated within an air intake passage 30 which communicates with a mixing chamher 32 which is disposed on the side of the port- 18 remote from the air intake passage 30. The structure so far defined is conventional and forms no part of this invention except in combination therewith.

Extending transversely across the mixing chamber 32 below the port 18 is a rock shaft 34 on which a lever 36 is mounted intermediate its ends to move about an axis which extends across the mixing chamber 32 adjacent its junction with the air intake passage 30 and I to one side of thelongitudinal axes of the passage and carburetor for moving .the valve against, the effort of the yielding means, an air foil mounted in the air passage to move therein toward andaway from the mixing chamber and operatlvely connected to the valve for moving said valve in response to'increasing velocity .of

air passing through the air passage. 7 h t Other features include a liquid fuel duct having a liquid fuel discharge port opening therethrough adjacent one end thereof, said duct having an annular groove opening therethrough in concentric spaced relation to the port, an annular guide flange mounted in said groove to move longitudinally thereof, a cone-shaped valve-body carried by the guide flange for movement therewith toward and away from said port, said valve body having a liquid fuel discharge passage extending, therethrough,

yielding means carried by the duct and engaging said 7 valve body for moving it into open position relative to the port, a counterbalance mounted adjacent one side of the liquid fuel duct and operatively connected to the valve body for advancing it toward the duct'against the elfort of the yielding means, and an air foil mounted adjacent the side of the duct remote from the counterbalance and operatively connected to the valve for moving said valve in response to increasing velocity of air passing said air foil, and said valve body having air passages extending therethrough.

In the drawings:

chamber. A counterbalance 38 which also defines an air foil is carried by the lever 36 adjacent the end thereof remote from the longitudinal axis of the passage 30 and mixing chamber 32, and carried by the end-of the lever 36 remote fromthe counterbalance and air foil 38 is a plunger 40 which extends longitudinally along the longitudinal axis of the air passage 30 and mixing chamber 32 and carries at its end remote from the lever 36 acom-pression coil spring 42 on which is seated a conical valve designated generally 44.

The conical valve 44, previously referred to, comprises a conical valve body 46 having an axial recess opening through its larger end to define a turbulence chamber 50, and opening through the inner end of the turbulence into the body 46 is an axial recess 48 to receive the spring 42. Carried by the body 46 and extending radial ly outwardly from the larger end thereof in circumferentially spaced relation are ears 52, and extending'upwardly from the smaller end of the conical body in concentric spaced relation thereto is a conical valve face 54 which extends into the valve seat 28 for regulating the flow of fuel through the port 18L Carried by and extending longitudinally from the smaller end of the valve body 46 in concentric spaced relation to the conical valve member 54 is an annular collar 56 which slidably enters an annular groove 58 which opens through the duct16 in concentric spaced relation to the port 18 and valve seat 28. The body 46 is provided with an annular row of longitudinally extending circumferentially spaced liquid fuel passages 60 which extend therethrough from the trough 62 defined between the conical valve portion 54 and the annular collar 56 to direct fuel passing through the port 18 intothe turbulence chamber 50 previously referred to. The valve body 46 has inclined'passages' 64 extending therethrough which open of and communicate with the passages 60 to introduce.

air into the fuel as it passes from the annular trough 62 through the passages 60 and into the turbulence chamber 50. A compression coiled spring 66 is carried by the duct 16 and'extends-through the port 13 for entrance into a seat 68 formed in the conical valve face 54' of the valve body 46 to yieldingly urge the valve 44 into open position against the effort of the counterbalance and air foil 38.

Secured to the ears '52 and extending upwardly adjacent the sides of the valve body 46 are converging legs 70 which are connected at their upper ends to a crosshead 7 2 upon which is seated a compression coiled spring 7 4 which extends axially with relation to the air passage 30 and aligns axially with an opening '76 formed in a transversely extending cross bar 78 carried by the carburetor and extending through the air passage '30. A plunger 80 is mounted to slide through the opening 76 and carries at its upper end a cross pin 82. Pivotally mounted on spaced ears 84 carried by the carburetor and extending into the air passage 30 is an arm designated generally '86 comprising a threaded stem '88 on which is mounted for longitudinal adjustment a turnbuckle 90. The coupling pin 82 of the plunger 80 extends transversely through an elongated slot 92 which opens through the arm 86 and carried on said arm adjacent the end thereof remote from the end which is pivotally connected to the cars 84 is an air foil '94. It will thus be seen that air passing through the air passage 30 will act against the air foil 94 to urge is downwardly and consequently move the plunger 80 against the effort of the counterbalance and air foil 38 to move the valve 44 open relative to the port 18. In order to stabilize the operation of the valve 44 and avoid the transmission thereto of inconsequential movements of the air foil '94, a dampening spring 96 is interposed between the cross bar 78 and the underside of the coupling of the plunger 80 with the arm 86 in surrounding relation to the plunger 80.

In operation, it will be evident that air passing through the air intake passage 30 toward the mixing chamber 32 will react against the .air foil 94 to move the valve 44 away from the port 18 to permit the flow of extra fuel into the mixing chamber 32 in direct ratio to the velocity :of the air so as to assure the proper mixture of air and fuel in the mixing chamber to meet the exact requirements of the engine speed. The vvalve, of course, is yieldingly held open under the effort of the spring 66 which reacts against the effort of the counterbalance and air .foil 38, and by proper relation between the air foil '94 and the air foil 38, it will be evident that the valve 44 will be properly balanced relative to the port 18 to assure the correct supply of fuel entering the mixing chamher and at the same time supplying to the engine only that amount of fuel required for a selected engine speed. It will thus be seen that the supply of fuel to the engine is governed solely by the position of the throttle valve 98 which is disposed between the mixing chamber and the intake manifold of the engine.

From the foregoing, it will be evident that by employing this particular metering valve on conventional internal combustion engine carburetors, only enough fuel will be supplied to the engine at a selected engine speed to obtain maximum engine operation, and thus fuel economies will be experienced.

While in theforegoing there has been shown and described the preferred embodiment of this invention, it is to be understood that minor changes in the details of construction, combination and arrangement of parts may be resorted to without departing from the spirit and scope of the invention as claimed.

What is claimed is:

1. -In a carburetor having an air intake passage, a fuel and air mixing chamber communicating with said pas sage, and a liquid fuel inlet port between the air intake passage and the mixing chamber, means for preserving a correct ratio of fuel to. air entering the mixing chamber, said means comprising a valve mounted in the air intake passage adjacent the port, gravity actuated means mounted within the mix-ing chamber and operatively connected to the valve for advancing it into closing relation to the port, and means mounted in the air intake passage and operatively connected to the valve for moving said valve against the effort of the gravity actuated means in response to increasing velocity of air passing through said intake passage toward the mixing chamber.

2. In a carburetor having an air intake passage, a fuel and air mixing chamber communicating with said passage, and a liquid fuel inlet port between the air intake passage and the mixing chamber, means for preserving a correct ratio of fuel to air entering the mixing chamber, said means comprising a valve mounted in the air intake passage adjacent the port, a combination counterbalance and airfoil mounted within the mixing chamber and operatively connected to the valve for advancing it into closing relation to the port, means mounted in the air intake passage and operatively connected to the valve for moving said valve again-st the effort of the counterbalance in response to increasing velocity of air passing through said intake passage toward the mixing chamber, yielding means carried by the carburetor and engaging the valve for holding said valve open against the effort of the counterbalance and airfoil, and said combination counterbalance and airfoil being responsive to increasing velocity of the mixture passing through the mixing chamber for moving the valve against the effort of the yielding means.

3. In a carburetor having an air intake passage, a fuel and air mixing chamber communicating with said passage, and a liquid fuel inlet port between the air intake passage and the mixing chamber, means for preserving a correct ratio of fuel to air entering the mixing chamber, said means comprising a valve mounted in the air intake passage adjacent the port, gravity actuated means mounted within the mixing chamber and operatively connected to the valve for advancing it into closing relation to the port, and an airfoil mounted in the .air passage to move therein toward and away from the mixing chamber and operatively connected to the valve for moving said valve against the effort of the gravity actuated means in response to increasing velocity of air passing through the air passage.

4. In a carburetor having an air intake passage, a fuel and air mixing chamber communicating with said passage, and a liquid fuel inlet. port between the air intake passage and the mixing chamber, means for preserving a correct ratio of fuel to air entering the mixing chamber, said means comprising a shaft carried by the carburetor and extending transversely across the mixing chamber, a lever mounted on the shaft for movement in an arcuate path, a valve carried by the lever for movement thereby into and out of closing relation to the port, 'a spring carried by the carburetor and engaging the valve for urging it into open relation to the port, and means carried by the lever within the mixing chamber for moving said valve against the effort of the spring, and means within the air passage and operatively connected to the valve for opening it in response to increasing velocity of the mixture passing through the mixing chamber.

5. In a carburetor having an air intake passage, a fuel and air mixing chamber communicating with said passage, and a liquid fuel inlet port between the air intake passage and the mixing chamber, means for preserving a correct ratio of fuel to air entering the mixing chamber, said means comprising a shaft carried by the carburetor and extending transversely across the mixing chamber, a lever mounted on the shaft for movement in an arcuate path, a valve carried by the lever for movement thereby into and out of closing relation to the port, a spring carried by the carburetor and engaging the valve for urging it into open relation to the port, means carried by the lever within the mixing chamher for moving said valve against the effort of the spring in response to increasing velocity of the mixture passing through the mixing chamber, and means mounted in the intake passage and operatively connected to the valve for counteracting the effort of the means carried by the lever in response to increasing velocity of air passing through the air intake passage.

6. In a metering valve for a carburetor a liquid fuel duct having a liquid fuel discharge port opening therethrough adjacent one end thereof, said duct having an annular groove opening therethrough in concentric spaced relation to the port, an annular guide flange mounted in. said groove, a cone-shaped valve body carried by the 'guide flange and defining therewith an annular trough,

said valve body having liquid fuel discharge passages extending therethrough and communicating with the trough, yielding means carried by the duct and engaging said valve, body for moving it into open position relative to the port, and a counterbalance mounted adjacent one side of the liquid fuel duct and operatively connected to the valve body for advancing it toward the duct against the effort of the yielding means.

7. In a metering valve for a carburetor a liquid fuel duct having a liquid fuel discharge port opening therethrough adjacent one end thereof, said duct having an annular groove opening therethrough in concentric spaced relation to the port, an annular guide flange mounted in said groove, a cone-shaped valve body carried by the guide flange for movement toward and away from said port, said valve body having liquid fuel discharge passages extending therethrough, yielding means carried by the duct and engaging said valve body for moving it into open position relative to the port, a counterbalance mounted adjacent one side of the liquid fuel duct and operatively connected to the valve body for advancing it toward the duct against the effort of the yielding means, an air foilmounted adjacent the side of the duct remote from the counterbalance and operatively connected to the valve for moving said valve in response to increasing velocity of air passing said air foil, and

said valve body having air passages extending therethrough.

References Cited in the file of this patent UNITED STATES PATENTS 699,309 Hamilton 'May 6, 1902 1,222,688 Shipman Apr. 17, 1917 1,249,381 Haas Dec. 11, 1917 1,258,881 Donning Mar. 12, 1918 1,405,777 Good Feb; 7, 1922

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