US2816573A - Carburetor metering valve screws - Google Patents
Carburetor metering valve screws Download PDFInfo
- Publication number
- US2816573A US2816573A US380894A US38089453A US2816573A US 2816573 A US2816573 A US 2816573A US 380894 A US380894 A US 380894A US 38089453 A US38089453 A US 38089453A US 2816573 A US2816573 A US 2816573A
- Authority
- US
- United States
- Prior art keywords
- shank
- bore
- carburetor
- screw
- head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M23/00—Apparatus for adding secondary air to fuel-air mixture
- F02M23/04—Apparatus for adding secondary air to fuel-air mixture with automatic control
- F02M23/08—Apparatus for adding secondary air to fuel-air mixture with automatic control dependent on pressure in main combustion-air induction system, e.g. pneumatic-type apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M3/00—Idling devices for carburettors
- F02M3/08—Other details of idling devices
- F02M3/10—Fuel metering pins; Nozzles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S261/00—Gas and liquid contact apparatus
- Y10S261/38—Needle valves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/794—With means for separating solid material from the fluid
- Y10T137/8122—Planar strainer normal to flow path
Definitions
- This invention relates to carburetor metering valve screws, and more particularly to such screws providing an air bleed, and the provision of a filter screen therefor.
- auxiliary air In internal combustion engine carburetors, particularly as applied to automotive vehicles, it is desirable to admit auxiliary air to the idling fuel prior to introducing such fuel into the carburetor throat. Such air admission assists in providing improved mixing, and tends to lean a mixture often too rich. Further, the admission of auxiliary air in such manner improves economy by reducing the flow of idling fuel, when the engine is acting as a brake, or decelerating.
- the present invention is directed toward providing a unitary metering screw having an air bleed, with a filtering screen to prevent the entrance of foreign matter, and to prevent clogging of the air bleed passage.
- the structure is unitary, capable of adjustment without disturbing the filtering effect of the screen, so that adjustment may be made under actual running conditions.
- the invention is further directed to an economical method of forming the parts from simple operations, which parts when assembled, form a permanent unitary metering screw and filter.
- Figure 1 is an enlarged view of the idling screw (about 4 times);
- Figure 2 is an axial sectional view taken substantially on the line 2-2 of Figure 1;
- Figure 3 is an exploded perspective view showing the parts prior to assembly.
- Figure 4 is a fragmentary sectional view diagrammatically showing the relation of the screw to the idling port or jet of a form of carburetor.
- an idling adjustment screw for a carburetor such screw acting as a control for the flow of fuel to the idling jet.
- the throat of a down draft carburetor such throat having a venturi 12, and throttle valve 14.
- Adjacent one edge of the throttle valve when in substantially closed position, is an idling port or jet 16, communicating with a fuel supply channel 18, there also being provided an auxiliary port 20, located in advance of the port 16.
- the port 16 has an annular valve seat 22, adapted to cooperate with the tapered metering end 24 of the adjustable control or needle valve screw 26, to regulate the rate of flow.
- the valve screw itself has a body portion 28, threaded as at 30, so as to be threadedly received in the carburetor Wall 32, such body portion being integral with the tapered metering end 24.
- the body portion of the metering screw has an axial bore 34, which may be reduced in diameter as at 36 before entering the metering end portion 24, in which portion such bore terminates, with a transverse radial or diametrical bore 38.
- the outer end of the body portion has a substantially cylindrical exterior 40, which may have elementally extending knurling 42.
- the end terminates with a transverse planar surface 44.
- the end or head 52 of the cap is provided with an axial bore 54, aligned with the bore 34 of the body portion, and a screw driver slot 56 is milled in the end diametrically thereacross.
- a fine mesh screen 55 of bronze or other suitable material is interposed between the end 44 of the body or shank portion, and the inside surface 57 of the cap end.
- Such disk may have a mesh of to fine wires to the inch, and will be in effect clamped in the position shown in Figure 2, when the cap is forced upon the end of the shank.
- Such screen is readily observable through the bore 54 of the cap, and may be cleaned by blowing out the shank bore 34 or by reverse flow of cleaning fluid through the shank.
- the mesh of the screen affords adequate free flow of air into the bleed passages while protecting such passages from the entrance of foreign matter.
- the screw as described is capable of manual adjustment without interfering with the air inlet, through thumb and finger engagement with the knurling 48. Further, if adjustment is to be made by a screw driver, the curvature 6%! of the milled slot prevents the blade of the screw driver from blocking the port to such an extent as to disturb the free fiow of air. Thus, adjustment is effected either manually or by a screw driver while the rigid assembly is functioning in its normal manner.
- a carburetor air bleed needle valve comprising a shank member having at one end a tapered needle valve portion, and one the other end a substantially cylindrical surface terminating abruptly and transversely of the shank axis to form a head end for receiving a cap, and an intermediate body portion between the needle valve portion and the cylindrical surface having screw threads along the length thereof, said shank having an axial bore extending from the head end to a point adjacent the intermediate portion end of said needle valve portion, said shank having a transverse bore through the needle valve portion communicating with the said axial bore, a hollow cap having a head and a substantially cylindrical skirt of an internal diameter for a press fit over the shank cylindrical surface, said cap being permanently positioned upon said shank, and having an axial bore in the head thereof in alignment with said shank bore, and a fine mesh screen disk filter element held and clamped upon the head end of the shank member by the hollow cap and extending transversely across the end'of said axial shank bore, said head having a diame
- a carburetor air bleed needle valve comprising a shank member having at one end a tapered needle valve portion, and on the other end a substantially cylindrical surface terminating abruptly and transversely of the shank axis to form a head end for receiving a cap, and an inl termediate body portion between the needle valve portion and the cylindrical surface having screw threads along the length thereof, said shank having an axial bore extending from the head end to a point adjacent the intermediate portion end of said needle valve portion, said shank having a transverse bore through the needle valve portion communicating with the said axial bore, a hollow cap having a head, and a substantially cylindrical skirt, the exterior thereof being knurled, and the interior thereof being of an internal diameter for a press fit over the shank cylindrical surface, said shank adjacent the head end being knurled lengthwise to grip the cap, said cap being permanently positioned upon the knurled portion of said shank, and having an axial bore in the head thereof in alignment with said shank bore, and a disk filter
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of The Air-Fuel Ratio Of Carburetors (AREA)
Description
Dec. 17,195?
A. G. KADDIS ETAL CARBURETOR METERING VALVE SCREWS M 2 w 8 m M m INVENTDRE ALBER B. KAIIDIS ATT URNEY United States Patent CARBURETOR METERING VALVE SCREWS Albert G. Kaddis and Ralph A. Shade, Rochester, N. Y.
Application September 18, 1953, Serial No. 380,894
2 Claims. (Cl. 137-550) This invention relates to carburetor metering valve screws, and more particularly to such screws providing an air bleed, and the provision of a filter screen therefor.
In internal combustion engine carburetors, particularly as applied to automotive vehicles, it is desirable to admit auxiliary air to the idling fuel prior to introducing such fuel into the carburetor throat. Such air admission assists in providing improved mixing, and tends to lean a mixture often too rich. Further, the admission of auxiliary air in such manner improves economy by reducing the flow of idling fuel, when the engine is acting as a brake, or decelerating.
The present invention is directed toward providing a unitary metering screw having an air bleed, with a filtering screen to prevent the entrance of foreign matter, and to prevent clogging of the air bleed passage. The structure is unitary, capable of adjustment without disturbing the filtering effect of the screen, so that adjustment may be made under actual running conditions. The invention is further directed to an economical method of forming the parts from simple operations, which parts when assembled, form a permanent unitary metering screw and filter.
The above and other novel features of the invention will appear more fully hereinafter from the following detailed description when taken in conjunction with the accompanying drawings. It is expressly understood that the drawings are employed for purposes of illustration only and are not designed as a definition of the limits of the invention, reference being had for this purpose to the appended claims.
In the drawings, wherein like reference characters indicate like parts:
Figure 1 is an enlarged view of the idling screw (about 4 times);
Figure 2 is an axial sectional view taken substantially on the line 2-2 of Figure 1;
Figure 3 is an exploded perspective view showing the parts prior to assembly; and
Figure 4 is a fragmentary sectional view diagrammatically showing the relation of the screw to the idling port or jet of a form of carburetor.
Referring to the drawings, there is shown an idling adjustment screw for a carburetor, such screw acting as a control for the flow of fuel to the idling jet. In Figure 4, there is shown the throat of a down draft carburetor, such throat having a venturi 12, and throttle valve 14. Adjacent one edge of the throttle valve, when in substantially closed position, is an idling port or jet 16, communicating with a fuel supply channel 18, there also being provided an auxiliary port 20, located in advance of the port 16. The port 16 has an annular valve seat 22, adapted to cooperate with the tapered metering end 24 of the adjustable control or needle valve screw 26, to regulate the rate of flow.
The valve screw itself has a body portion 28, threaded as at 30, so as to be threadedly received in the carburetor Wall 32, such body portion being integral with the tapered metering end 24. In order to bleed air into the fuel being drawn into the carburetor throat below the throttle valve, the body portion of the metering screw has an axial bore 34, which may be reduced in diameter as at 36 before entering the metering end portion 24, in which portion such bore terminates, with a transverse radial or diametrical bore 38.
The outer end of the body portion has a substantially cylindrical exterior 40, which may have elementally extending knurling 42. The end terminates with a transverse planar surface 44. A cap member 46 having external knurling 48, and an internal bore 50 forming a skirt portion 51, is forced over the end of the body portion to form a permanent fit. The end or head 52 of the cap is provided with an axial bore 54, aligned with the bore 34 of the body portion, and a screw driver slot 56 is milled in the end diametrically thereacross.
In order to protect the bore from clogging as by the entrance of foreign matter or particles, a fine mesh screen 55 of bronze or other suitable material is interposed between the end 44 of the body or shank portion, and the inside surface 57 of the cap end. Such disk may have a mesh of to fine wires to the inch, and will be in effect clamped in the position shown in Figure 2, when the cap is forced upon the end of the shank. Such screen is readily observable through the bore 54 of the cap, and may be cleaned by blowing out the shank bore 34 or by reverse flow of cleaning fluid through the shank. The mesh of the screen affords adequate free flow of air into the bleed passages while protecting such passages from the entrance of foreign matter.
In practice, it will be understood that the heavy suction in the carburetor below the throttle valve, which is substantially closed during idling, will draw gasoline or other fuel from the port 16, as regulated by the tapered needle valve. The suction created will at the same time, draw air in through the axial and radial bores of the screw and lean the mixture, which in many cases would otherwise be too rich. Such air will create turbulence and aeration, and provide better mixing and improved idling performance. When the throttle is closed, and the motor is acting as a brake, the engine manifold suction on the port is increased, and fuel drawn into the engine is wasted. During such times, the air bleed acts to lessen the quantity of fuel drawn into the engine and thereby provides economy.
It will be seen that the screw as described is capable of manual adjustment without interfering with the air inlet, through thumb and finger engagement with the knurling 48. Further, if adjustment is to be made by a screw driver, the curvature 6%! of the milled slot prevents the blade of the screw driver from blocking the port to such an extent as to disturb the free fiow of air. Thus, adjustment is effected either manually or by a screw driver while the rigid assembly is functioning in its normal manner.
While a single embodiment of the invention has been illustrated and described, it is to be understood that the invention is not limited thereto. As various changes in the construction and arrangement may be made without departing from the spirit of the invention, as will be apparent to those skilled in the art, reference will be had to the appended claims for a definition of the limits of the invention.
What is claimed is:
l. A carburetor air bleed needle valve comprising a shank member having at one end a tapered needle valve portion, and one the other end a substantially cylindrical surface terminating abruptly and transversely of the shank axis to form a head end for receiving a cap, and an intermediate body portion between the needle valve portion and the cylindrical surface having screw threads along the length thereof, said shank having an axial bore extending from the head end to a point adjacent the intermediate portion end of said needle valve portion, said shank having a transverse bore through the needle valve portion communicating with the said axial bore, a hollow cap having a head and a substantially cylindrical skirt of an internal diameter for a press fit over the shank cylindrical surface, said cap being permanently positioned upon said shank, and having an axial bore in the head thereof in alignment with said shank bore, and a fine mesh screen disk filter element held and clamped upon the head end of the shank member by the hollow cap and extending transversely across the end'of said axial shank bore, said head having a diametral slot extending across the head and said slot having a concave bottom.
2. A carburetor air bleed needle valve comprising a shank member having at one end a tapered needle valve portion, and on the other end a substantially cylindrical surface terminating abruptly and transversely of the shank axis to form a head end for receiving a cap, and an inl termediate body portion between the needle valve portion and the cylindrical surface having screw threads along the length thereof, said shank having an axial bore extending from the head end to a point adjacent the intermediate portion end of said needle valve portion, said shank having a transverse bore through the needle valve portion communicating with the said axial bore, a hollow cap having a head, and a substantially cylindrical skirt, the exterior thereof being knurled, and the interior thereof being of an internal diameter for a press fit over the shank cylindrical surface, said shank adjacent the head end being knurled lengthwise to grip the cap, said cap being permanently positioned upon the knurled portion of said shank, and having an axial bore in the head thereof in alignment with said shank bore, and a disk filter element held and clamped upon the head end of the shank member by the hollow cap and extending transversely across the end of said axial shank bore, said head having a diametral slot extending across the head and said slot having a concave bottom.
References Cited in the file of this patent UNITED STATES PATENTS Featherston Feb. 22,
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US380894A US2816573A (en) | 1953-09-18 | 1953-09-18 | Carburetor metering valve screws |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US380894A US2816573A (en) | 1953-09-18 | 1953-09-18 | Carburetor metering valve screws |
Publications (1)
Publication Number | Publication Date |
---|---|
US2816573A true US2816573A (en) | 1957-12-17 |
Family
ID=23502861
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US380894A Expired - Lifetime US2816573A (en) | 1953-09-18 | 1953-09-18 | Carburetor metering valve screws |
Country Status (1)
Country | Link |
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US (1) | US2816573A (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3091184A (en) * | 1960-08-10 | 1963-05-28 | Smith Douglass Company Inc | Pump anti-cavitation device |
US3166611A (en) * | 1962-09-06 | 1965-01-19 | Robert L Conant | Carburetor |
US3346244A (en) * | 1965-09-28 | 1967-10-10 | Cornelius G Bess | Jet air idle screw |
US3352545A (en) * | 1966-05-31 | 1967-11-14 | John F Denine | Carburetor construction |
DE2060612A1 (en) * | 1969-12-09 | 1971-06-16 | Nissan Motor | Carburetor |
US3875922A (en) * | 1973-04-18 | 1975-04-08 | Jr Frank Kirmss | Vapor injection system |
US3896194A (en) * | 1974-06-06 | 1975-07-22 | Frank T Martin | Carburetor idle control means |
US3985837A (en) * | 1973-10-09 | 1976-10-12 | Rock Howard P | Vented needle valve for carburetor idle port |
US4075296A (en) * | 1977-01-25 | 1978-02-21 | Orsini Ronald J | Idle speed needle screw for carburetors |
US4237079A (en) * | 1977-05-06 | 1980-12-02 | Robert Bosch Gmbh | Fuel supply device |
US5935434A (en) * | 1998-02-18 | 1999-08-10 | Cates Propane Plant Construction, Inc. | In-line pipe coupling and fluid strainer apparatus |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1786432A (en) * | 1929-01-04 | 1930-12-30 | Danver | Lubricating device |
US2288715A (en) * | 1939-05-10 | 1942-07-07 | Cons Gas Electric Light And Po | Pilot burner control |
US2590217A (en) * | 1948-08-31 | 1952-03-25 | Lucile M Hursh | Combined air filter and needle valve |
US2702694A (en) * | 1951-08-08 | 1955-02-22 | Robert H Van Matre | Auxiliary carburetor and fuel vaporizer for internal-combustion engines |
-
1953
- 1953-09-18 US US380894A patent/US2816573A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1786432A (en) * | 1929-01-04 | 1930-12-30 | Danver | Lubricating device |
US2288715A (en) * | 1939-05-10 | 1942-07-07 | Cons Gas Electric Light And Po | Pilot burner control |
US2590217A (en) * | 1948-08-31 | 1952-03-25 | Lucile M Hursh | Combined air filter and needle valve |
US2702694A (en) * | 1951-08-08 | 1955-02-22 | Robert H Van Matre | Auxiliary carburetor and fuel vaporizer for internal-combustion engines |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3091184A (en) * | 1960-08-10 | 1963-05-28 | Smith Douglass Company Inc | Pump anti-cavitation device |
US3166611A (en) * | 1962-09-06 | 1965-01-19 | Robert L Conant | Carburetor |
US3346244A (en) * | 1965-09-28 | 1967-10-10 | Cornelius G Bess | Jet air idle screw |
US3352545A (en) * | 1966-05-31 | 1967-11-14 | John F Denine | Carburetor construction |
DE2060612A1 (en) * | 1969-12-09 | 1971-06-16 | Nissan Motor | Carburetor |
US3875922A (en) * | 1973-04-18 | 1975-04-08 | Jr Frank Kirmss | Vapor injection system |
US3985837A (en) * | 1973-10-09 | 1976-10-12 | Rock Howard P | Vented needle valve for carburetor idle port |
US3896194A (en) * | 1974-06-06 | 1975-07-22 | Frank T Martin | Carburetor idle control means |
US4075296A (en) * | 1977-01-25 | 1978-02-21 | Orsini Ronald J | Idle speed needle screw for carburetors |
US4237079A (en) * | 1977-05-06 | 1980-12-02 | Robert Bosch Gmbh | Fuel supply device |
US5935434A (en) * | 1998-02-18 | 1999-08-10 | Cates Propane Plant Construction, Inc. | In-line pipe coupling and fluid strainer apparatus |
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