US3520520A - Charge forming device - Google Patents

Description

July 14, 1970 R. L. CHESKEY 3,520,520

CHARGE FORMING DEVICE Filed Sept. 18, 1968 2 Sheets-Sheet l Fig.

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CHARGE FORMING DEVICE Filed Sept. 18, 1968 2 Sheets-Sheet Fig. 3

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United States Patent "ice 3,520,520 CHARGE FORMING DEVICE Robert L. Cheskey, Cochranton, Pa., assignor of forty percent to C.H. & C.R. Enterprises, Inc., a corporation of Pennnsylvania Filed Sept. 18, 1968, Ser. No. 760,485 Int. Cl. F02m 19/04 U.S. Cl. 26141 6 Claims ABSTRACT OF THE DISCLOSURE A body defining an air and fuel mixture passage extending therethrough with variable air valve means operatively associated with the passage for controlling the flow of air through the passage. A liquid fuel chamber is supported from the body and includes a fuel inlet and a fuel outlet opening into the air and fuel mixture passage. Also, a metering sleeve is disposed in the fuel chamber with one outlet end portion registered with and opening into the inlet end of the fuel outlet passage and a tubular fuel jet is rotatably disposed in the sleeve. The tubular fuel jet and sleeve are provided with longitudinally extending and registrable openings formed through wall portions thereof and liquid fuel fiow from the fuel chamber into the air and fuel mixture passage through the outlet passage of the fuel chamber leading into the air and fuel mixture passage is controlled by variable registry of the openings formed in the sleeve and the fuel jet.

The charge forming device of the instant invention has been designed primarily for providing a means of accurately producing an air and fuel mixture of proper ratio throughout a given range of air and fuel mixture fiow through the charge forming device. The device has been specifically designed for use in forming a proper air and fuel mixture for vehicular internal combustion engines. However, as will be readily apparent from the simplicity of construction and operation to be hereinafter more fully set forth the charge forming device is also particularly well adapted to provide air and fuel mixtures for different purposes.

The main object of this invention is to provide an apparatus capable of more accurately controlling the formation of an air and fuel mixture throughout a predetermined range of air and fuel mixture flow.

Another object of this invention is to provide a charge forming device which is particularly well adapted for use in connection with the formation of proper air and fuel mixtures for vehicular internal combustion engines.

Yet another object of this invention is to provide a charge forming device in accordance with the preceding objects and which, because of its capability of more precisely forming an air and fuel mixture of correct ratio, will afford increased fuel economy, greater power and less tendency to support the formation of smog due to excessive amounts of unburned hydrocarbons in the exhaust of an associated internal combustion engine.

A final object of this invention to be specifically enumerated herein is to provide a charge forming device in accordance with the preceding objects which will conform to conventional forms of manufacture, be of simple construction and easy to service so as to provide a device that will be economically feasible, long lasting and relatively trouble-free in maintenance.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein 3,520,520 Patented July 14, 1970 like numerals refer to like parts throughout, and in which:

FIG. 1 is a fragmentary side elevational view of an internal combustion engine with which the charge forming device of the instant invention is operatively associated;

FIG. 2 is a fragmentary vertical sectional view taken substantially upon a plane passing through the right hand portion of FIG. 1 and as seen from the right hand portion of FIG. 1;

FIG. 3 is an enlarged fragmentary vertical sectional view taken substantially upon the plane indicated by the section line 33 of FIG. 1;

FIG. 4 is a fragmentary vertical sectional view taken substantially upon the plane indicated by the section line 4-4 of FIG. 3;

FIG. 5 is a fragmentary vertical sectional view taken substantially upon the plane indicated by the section line 5-5 of FIG. 3;

FIG. 6 is an enlarged fragmentary horizontal sectional view taken substantially upon the plane indicated by the section line 66 of FIG. 1;

FIG. 7 is a schematic sectional view similar to FIG. 3 but with some details of the charge forming device omitted and including a diagrammatic representation of the fuel lines operatively associated with the charge forming device;

FIG. 8 is a fragmentary vertical sectional view taken substantially upon a plane passing through the fuel metering valve of the charge forming device with the relatively rotatable portions of the metering valve in relative positions blocking the flow of fuel therethrough;

' FIG. 9 is a view similar to FIG. 8 but with the relatively rotatable portions of the metering valve in relative positions affording minimum flow of fuel therethrough;

FIG. 10 is a view similar to FIGS. 8 and 9 but with the relatively rotatable portions of the metering valve positioned to afford substantially maximum flow of fuel therethrough;

FIG. 11 is a fragmentary elevational view of the tubular fuel jet portion of the metering valve; and

FIG. 12 is a fragmentary sectional view taken substantially upon the plane indicated by the section line 1212 of FIG. 10.

Referring now more specifically to the drawings, the numeral 10 generally designates an internal combustion engine of the conventional automotive type including an intake manifold referred to in general by the reference numeral 14 having a carburetor mounting boss 16 thereon. The charge forming device of the instant invention is generally referred to by the reference numeral 18 and includes a body referred to in general by the reference numeral 20 consisting of upper and lower sections 22 and 24 removably secured together in any convenient manner such as by fasteners (not shown). The lower section 24 includes a mounting flange 26 which is secured to the mounting boss 16 in a conventional manner by means of fasteners 28 and the upper section 22 includes an air inlet neck 30 upon which a conventional air cleaner assembly referred to in general by the reference numeral 32 is mounted.

The body 20 defines a first air and fuel mixture passage 34 extending vertically therethrough whose upper inlet end 36 opens upwardly into the inlet neck 30 and whose outlet end 38 opens downwardly into the air and fuel passage 40 formed in the mounting boss portion 16 of the intake manifold 14.

A butterfly air valve plate 42 is mounted on a control shaft 44 journaled in the body 12. The plate 42 is supported from one end of the control shaft 44 which extends diametrically of the passage 34 and the other end of the 3 control shaft 44 extends outwardly from the body 20 and has a lever arm 46 secured thereto as well as a pair of parallel lever arms 48.

The body 20 includes a hollow fuel chamber 50 through which the control shaft 44 extends and which has a fiexible diaphragm 52 of resilient material therein dividing the chamber 50 into an upper section 54 and a lower section 56. The lower section 56 is sealed and has any suitable atmosphere disposed therein.

The upper section 54 includes a fuel outlet opening 58 which opens into the upper section 54 at its inlet end and outwardly into the passage 34 at its outlet end. A tubular stationary sleeve 60 is secured in and extends transversely of the upper section 54 and has one end thereof registered with the fuel outlet opening 58. In addition, a fuel jet shaft 62 is journaled from the body 20 and includes a hollow end portion rotatably received through the sleeve 60 and includes a hollow tapered or pointed end 64 which projects into the fuel outlet opening 58. The end of the fuel jet shaft 62 remote from the pointed end 64 is rotatably received through the body 20 and includes an outer end portion having a lever arm 66 mounted thereon in vertical registry with and connected to the lever arm 46 through a connecting link 68 whose opposite ends are pivotally connected to the free ends of the lever arms 46 and 66.

The fuel chamber 50 includes a fuel inlet opening 70 which is internally threaded and has one end of a fuel line 80 secured therein by means of a suitable fitting 82. The fuel line 80 extends to a suitable source (not shown) of fuel and has a pump 84 disposed therein as well as a one-way check valve 86. A bypass line 88 is provided and its inlet end is communicated with the line 80 downstream from the pump 84 and its outlet line is communicated with the line 80 upstream from the pump 84. The bypass line 88 has a pressure release valve 90 disposed therein and is operative to recirculate liquid fuel back to the pump 84 in the event fuel pressure beyond a predetermined pressure is present in the line 80 downstream from the pump 84.

The body 20 also defines an idle fuel chamber 92 on the side of the passage 334 remote from the chamber 50 and the chamber 92 has a diaphragm 94 similar to the diaphragm 52 disposed therein which divides the chamber 92 into an upper section 96 and a lower section 94. The upper section 96 is sealed and filled with a suitable atmosphere and a fuel 98 has its inlet end communicated with the line 80 intermediate the inlet end of the bypass line 88 and the one-way check valve 86. The outlet end of thef line 98 opens into the lower section 94 of the chamber 92.

The lower section 94 of the chamber 92 is communicated with the passage 34 through a fuel jet orifice element 100 with which an idle jet needle valve member 102 is operatively associated. The idle jet needle valve member 102 is threadedly supported from the body 20 and includes a pointed end 104 which may be moved into and out of seated engagement with the fuel jet orifice element 100 by rotation of the valve member 102 in the threaded bore 106 of the body 20 in which the valve member 102 is threadedly engaged.

A connecting fitting 108 is connected between the free ends of the lever arms 48 and one end of the core 110 of a Bowden cable assembly referred to in general by the reference numeral 112 is anchored through the connecting fitting 108 whereby longitudinal shifting of the core 110 will cause the lever arms 48, the control shaft 44, the lever arms 46 and 66 and the shaft 62 to oscillate.

With attention now invited more specifically to FIGS. 8-12 of the drawings it may be seen that the sleeve 60 has a longitudinally extending slot 114 formed in one wall portion thereof and that the slot 114 is of greater transverse width at its end remote from the pointed end 64 of the fuel jet shaft 62. In addition, it may be seen from FIGS. 9-l2 that the hollow end portion of the fuel jet shaft 62 includes a longitudinally extending slot 116 formed therein and which is of greater transverse dimension at its end adjacent the pointed end 64 of the fuel jet shaft 62.

The fuel jet shaft 62 is rotatable relative to the sleeve 60 and the opening 116 may be moved into and out of selected registry with the opening 114 whereby the flow of fuel from the upper section 54 of the fuel chamber 52 into the interior of the hollow end of the fuel jet shaft 62 may be varied. The fuel within the chamber 50 is under pressure and substantially the same pressure is maintained within the hollow end of the fuel jet shaft 62 when the openings 114 and 116 are in partial registry with each other and therefore liquid fuel is sprayed outwardly through the small orifice 118 defined at the apex of the pointed end 64. This liquid fuel is of course jetted into the passage 34 for mixture with the air entering the passage 34 from the air cleaner 32 before the air passes the plate 42.

While the orifice 116 is obviously smaller than the effective cross-sectional areas of the registered portions of the openings 114 and 116 illustrated in FIGS. 9 and 10 of the drawings, the cross-sectional areas of the registered portions of the openings 114 and 116 does control the rate of fuel flow into the interior of the hollow end of the fuel jet shaft 62 and therefore variation in the registry of the openings 114 and 116 will change the amount of liquid fuel that is jetted outwardly from the interior of the pointed end 64 of the fuel jet shaft 62 into the passage 34. Of course, the diaphragms 52 and 94 are provided to modulate any pulses in fuel pressure caused by the pump 84 and the valve member 102 may be adjusted as desired to provide the desired amount of fuel for idling purposes. Also, the one-way check valve 86 is provided to prevent fuel under pressure within the chamber 50 from flowing backward through the line 80, into the line 98 and then into the chamber 92 when operation of the associated internal combustion engine is terminated.

What is claimed as new is as follows:

1. A charge forming device comprising a body defining a first air and fuel mixture passage extending therethrough and adapted to comprise a portion of the air and fuel intake passages of a combustion apparatus, said body including adjustable variable air valve means operatively associated with said passage for controlling the flow of air through said passage, a liquid fuel chamber supported from said body to one side of said passage and including a wall portion common with said passages, said chamber also including a fuel inlet and a second fuel outlet passage extending through said common wall portion and whose outlet end opens into said first passage, a metering sleeve disposed in said fuel chamber with one outlet end portion registered with an opening into the inlet end of said second passage, said sleeve having a first fuel metering opening formed through one wall thereof, a tubular fuel jet rotatably disposed in said sleeve and having a second fuel metering opening formed through one wall thereof and a first open end portion disposed in said one end portion, said first and second openings, upon rotation of said jet relative to said sleeve having different areas thereof in registry with each other to vary the effective cross-sectional area of the fuel passage defined thereby communicating said chamber with the interior of said jet, said jet including a hollow open-ended tapered outlet end portion extending through the outlet end portion of said sleeve and at least to the outlet end of said second passage for direct discharge of fuel therefrom directly into said first passage, said fuel chamber including an interiorly disposed fluid impervious flexible diaphragm constructed of resilient material dividing the interior of said chamber into at least two sections, said fuel inlet opening into and said sleeve being disposed in a first of said sections and the second of said sections being closed and having a compressible fluid disposed therein whereby said diaphragm and fluid will act to reduce pressure pulses of liquid fuel discharged into said first section.

2. The combination of claim 1 wherein said first and 5 second fuel metering opening are elongated and extend longitudinally of said sleeve and jet and include a first pair of remote end portions greater in transverse dimensions than the transverse dimensions of a second pair of remote end portions thereof.

3. The combination of claim 1 wherein said body includes a second fuel chamber including an inlet and a fuel outlet opening into said first passage, and an idle jet adjustably supported from said body and operatively associated with second chamber outlet for controlling the flow of fuel therethrough.

4. The combination of claim 1 including connecting means operatively connecting said adjustable variable air valve means to said rotatable fuel jet for rotation of the latter in response to adjustment of said variable air valve means.

5. The combination of claim 4 wherein said air valve means includes a butterfly plate disposed in said air and fuel mixture passage mounted on a control shaft journaled from said body and having one end portion disposed exteriorly of said body.

6. The combination of claim 5 wherein said connecting means comprises generally parallel laterally projecting lever arms carried by said control shaft and fuel jet exteriorly of said body and a connecting link whose opposite ends are pivotally connected to the free ends of said lever arms.

References (Iited UNITED STATES PATENTS 2,828,115 3/1958 Register 261- 51 X 3,130,247 4/ 1964 Little 261-50 3,160,681 12/1964 Johnson.

3,250,224 5/1966 Phillips et a1.

3,258,254 6/1966 Jakob 261-50 X 3,341,185 9/1967 Kennedy.

3,348,824 10/1967 Soubis 261-51 X FOREIGN PATENTS 511,674 9/1920 France.

10,528 12/1909 Great Britain.

TIM R. MILES, Primary Examiner US. Cl. X.R. 2615 1, 72

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