US3695592A - Plate-type air valve carburetor - Google Patents

Plate-type air valve carburetor Download PDF

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Publication number
US3695592A
US3695592A US44302A US3695592DA US3695592A US 3695592 A US3695592 A US 3695592A US 44302 A US44302 A US 44302A US 3695592D A US3695592D A US 3695592DA US 3695592 A US3695592 A US 3695592A
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United States
Prior art keywords
air
air valve
intake passage
valve
upstream
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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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US44302A
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English (en)
Inventor
John Quatrano
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Bendix Corp
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Bendix Corp
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Publication date
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Publication of US3695592A publication Critical patent/US3695592A/en
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    • 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
    • F02M19/00—Details, component parts, or accessories of carburettors, not provided for in, or of interest apart from, the apparatus of groups F02M1/00 - F02M17/00
    • 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
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7748—Combustion engine induction type
    • Y10T137/7753—Unbalanced pivoted valve [e.g., unbalanced butterfly type]
    • 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
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7754—Line flow effect assisted

Definitions

  • ABSTRACT In a plate-type air valve carburetor having a variable direction air flow, air foil means are provided to compensate for the apparent change in direction of air flow from intermediate to high air flow conditions. As the plate-type air valve aligns itself with the direction of air flow,
  • the present invention is related to air valve carburetors in general and in particular to air valve carburetors which employ a plate-type air valve to provide a signal indicative of the air velocity through the carburetor.
  • the prior art shows that it is well known to employ a plate-type air valve in a carburetor 'to control the amount of fuel being provided to the air stream for ultimate supply to the combustion chambers. of an internal combustion engine.
  • the plate-type air valve carburetors generally employ a flat platetype valve, positioned to block the air intake of the carburetor, resiliently biased to the closed. position. This valve is connected through suitable linkage members to a fuel metering needle and fuel metering orifice such that movement of the valve from the closed to the open position will vary the position of the metering needle within the orifice. This has the ultimate result that a variable supply of fuel, typically gasoline, will be provided to the air stream downstream of the air valve.
  • contoured air passage and contoured air valve has generated another problem which becomes apparent only at the wide open throttle setting; As the air valve begins to approach the wide open position, which should be indicative of a high demand for fuel and air the apparent direction of air flow past the air valve tends to be at some angle to the real axis of the air passage due to the contours which were added to smooth out low air flow operation. In those engine demand situations calling for increased fuel and air delivery to the engine, the air valve, having assumed a position which corresponds to a part throttle setting, will not open to the position which will provide the maximum fuel delivery.
  • the air valve In the transitionfrom the fully closed to the wide open throttle position, the air valve will assume some position corresponding to air flow at a part-throttle setting and will not, from that time forward, respond to increases in the velocity of air flow invention to provide a means for urging the air valve beyond its nominal wide open setting into a true wide open setting corresponding with themaximum air flow through the air passage of the carburetor. Furthermore, variations in air flow direction may occur from the geometry of the associated air cleaner or the configuration of surrounding masses of engine, vehicle body and the like. It is, therefore, a still further object of the present invention to provide a means for urging an air valve to a wide open position when changes in direction of the moving air stream otherwise prevent such movement.
  • an object of the present invention to provide a means to correct the angular positioning of the plate-type air valve such that the angular positioning of the air valve and the accuracy of the fuel metering are unaffected by hysteresis. It is a further object of this invention to provide a means for opening the air valve from its previously described maximum position to a position which corresponds with the fuel demand of the engine at maximum air flows.
  • the presentinvention provides a plate-type air valve carburetor with an air foil positioned near the intake of the air passage so as to provide a zone of low pressure into which the extreme upstream or leading edge of the plate-type air valve may travel upon its opening rotation.
  • the stationary air foil By providing the stationary air foil, the operation of the plate-type air valve is not affected until the air valve begins to enter the nearly wide open position, at which point the prior art variable-direction air flow air valve carburetors had reached their maximum capability in fuel metering. Because the air foil is within the air stream at an extreme of the physical limitations upstream position, it has no overall effect upon the .air
  • the air foil can be further restricted in its size so as to have no effect upon the air valve until the air valve begins to approach the position which was a maximum for the prior art air valve carburetors.
  • the air foil therefore, is operative to affect the angular position of the plate-type air valve with respect to the axis of the air intake passage over the full range of variations thereby permitting complete control of fuel metering within the air valve carburetor without affecting the metering and linkage characteristics.
  • the physical height of this type of carburetor when mounted atop the engine as is the U. S. automotive practice, can be maintained as low as possible due to the fact that the upper edge of the air valve, as it nears the region which would expose it to the atmospheric air, comes into the influence of the air foil.
  • FIG. 1 shows my invention as applied to a plate-type air valve carburetor having a contoured air intake and a contoured plate type air valve.
  • FIG. 2 shows a fragmentary view of the air valve approaching the part throttle position as it approaches the region influenced by the air foil.
  • FIG. 3 shows in the second fragmentary view the air valve at the wide open throttle position with the air valve under the influence of the air foil.
  • FIG. 4 shows an elevational view of the air foil of FIGS. 1, 2 and 3.
  • FIGS. 1, 2 and 3 and particularly to FIG. 1 my invention is illustrated as applied to an air valve carburetor, indicated generally as 10, having a body 11.
  • the carburetor is comprised of air passage 12 extending through body 11 and fuel supply means 14 associated therewith. Fuel from supply means 14 is introduced into the air passage 12 via fuel supply conduit 16.
  • the air valve 18 which is shown as a contoured plate and is attached for angular movement about shaft 20. As illustrated in FIG. 1, the air valve is in the fully closed position preventing air flow through conduit 12 and regulating the fuel supply means so that there is no fuel flow through the fuel conduit 16.
  • Air valve 18 is interconnected with fuel supply means 14 through suitable linkage means, not shown, such that the fuel delivery therefrom is metered and controlled in response to the air valve position.
  • Air valve wide open assist means indicated generally by 21 are shown in FIG. 1 as being an air foil 22 positioned upstream of the air valve 18.
  • Air foil 22 is illustrated in this embodiment as being a stationary air foil of conventional design and is sufficiently small to present a negligible restriction to total air flow through the intake passage 12.
  • Air foil 22 is attached by conventional means, shown as bolt 23, to support 25.
  • Support 25 is adapted to position air foil 22 in an intercepting relationship with the upstream edge 24 of air valve 18 when air valve 18 is rotated to its open position.
  • the foil is, of course, somewhat upstream of this position as direct physical contact is not desired but rather it is desired that the upstream edge 24 of air valve 18 will intercept the low pressure region 26 normally associated with an air foil in a moving stream of air when the air valve 18 approaches wide open position.
  • air intake passage 12 is provided with various contours 28, 30 such that the direction of air flow through conduit 12 will vary from the mouth of passage 12 to the region below the fuel conduit 16.
  • This variation along with the contour in the plate-type air valve itself, is operative to provide the necessary smooth transition in fuel/air mixture flow from idle operation to the part throttle operation.
  • the prior art devices were substantially limited in their wide-open throttle position to that shown in phantom lines in FIG. 1 as a result of the air valve attaining this position at part throttle operation and increased air demand being supplied by that portion of the air intake passage 12 to the right (relative to FIG. 1 of the drawing) of the air valve pivot.
  • the air being drawn through the air intake passage 12 will, due to the contour at 30, establish a laminar flow characteristic to the right (relative to FIG. 1 of the drawing) of the air valve pivot.
  • This laminar flow will spread to fill the entire intake downstream of the air valve establishing a pressure balance across the downstream portion of the air valve which will prevent, in the absence of my invention, further opening movement of the air valve.
  • FIG. 2 illustrates, in a fragmentary view, the air valve portion of the air intake 12.
  • air valve 18 has rotated counterclockwise in response to the passage of air through intake passage 12.
  • a low pressure region 26 has formed downstream of the air foil 22 but due to the relatively slight velocity of air passing through intake passage 12, the region 26 is small and the upstream portion of valve 18 is not sufficiently close to region 26 to be influenced thereby.
  • the air valve in this figure is approaching the position corresponding to part throttle operation.
  • FIG. 3 illustrates the FIG. 1 embodiment as the air valve 18 reaches the position corresponding to wide open throttle.
  • the region 26 has grown in size while rotary movement of the air valve 18 and shaft 20 has brought the upstream edge 24 of air valve 18 into the region 26.
  • FIG. 4 shows an elevational view of the air foil 22 of the present invention.
  • Air foil 22 is shown as an elongated inverted isosceles triangle attached by suitable means, such as bolt 23 through a portion in proximity to the central portion of the base thereof to support 25.
  • suitable means such as bolt 23 through a portion in proximity to the central portion of the base thereof to support 25.
  • the downward pointing apex of the triangle extends downwardly into the interior of passage 12 (shown in FIGS. 1, 2 and 3).
  • This shape of air foil is particularly suited to an air valve having a dimension along its axis in excess of the dimension perpendicular to the axis to the upstream edge of the air valve.
  • the air foil 22 will be in the position illustrated by solid lines in FIG. 1. This corresponds to the closed position at which time there will be no fuel flow through the fuel conduit 16.
  • air will be drawn through the air intake passage 12 by the ordinary action of the cylinders and intake valve opening and closing. This flow of air will create a low pressure region downstream of the air valve 18 and will cause, through the differential area and differential pressures, the valve to pivot about pivot 20 in a counterclockwise direction. This opening movement of the air valve 18 will initiate a fuel flow through conduit 16 in the conventional fashion of air valve carburetors.
  • This fuel flow through conduit 16 is a function of the angular position of the air valve 18 with respect to its closed position (as illustrated in solid lines in FIG. 1).
  • the engine will be in the part throttle operational mode. That is to say that the engine will be operating at an intermediate power setting and will be demanding fuel and air in substantially the relationship provided by the angular position of air valve 18 and the unrestricted flow area provided within the conduit 12.
  • the air foil 22 is disturbing the flow of air upstream of foil 22 but this turbulence in the air stream is not communicated to the downstream side of air valve 18 due to the fact that air valve 18 is in a substantially blocking relationship across this portion of air intake 12.
  • the fuel supplied in accord with the air valve setting will be sub stantially as required by the engine through the conventional metering linkage (not shown).
  • the air valve will pivot counterclockwise, relative to FIG. I, a more fully open position as illustrated in FIG. 3.
  • the air valve would reach a substantially balanced position at which point in time due to the curvature of the intake passage 12 and the curvature of the air valve 18, the air valve would be axially centered relative to the direction of flow of air through the intake passage and further increases in the flow of air would not operate to increase the flow of fuel through conduit 16.
  • this corresponded to a maximum fuel setting which was somewhat below that necessary to permit the engine to achieve its maximum power capabilities. It is at this point in time where my invention becomes applicable.
  • the upstream edge 24 thereof approaches the low pressure region associated with air foil 22.
  • the amount of and the extent of the low pressure region associated with an air foil in a moving stream of air is a function of the velocity of that stream of air with respect to the air foil as well as the curvature of the foil.
  • the amount of air being ingested by the engine through intake passage 12 increases in volume, it will increase in velocity. This will produce a continuing increase in the size of the low pressure region which is illustrated by number 26.
  • the exact point at which the edge 24 of air valve 18 enters the low pressure region 26 can be varied. At this point In time,
  • air valve assist means situated in the air intake passage upstream of the air valve operative to assist movement of the air valve to the maximum open position including air foil means coupled to the air intake passage operative to generate a low pressure zone within the air intake passage in intercepting relationship with the upstream edge of the air valve when the air valve is in the maximum open position.
  • air valve assist means situated upstream of the air valve operative to assist movement of the air valve to the maximum open position including means for generating a low pressure zone within the air intake passage in the region of the upstream edge of the air valve and said means for generating a low pressure zone comprising air foil means attached to the housing and positioned at the mouth of the air intake passage so that a low pressure zone will be generated thereby in an intercepting relationship with the upstream edge of the air valve.

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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)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
US44302A 1970-06-08 1970-06-08 Plate-type air valve carburetor Expired - Lifetime US3695592A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US4430270A 1970-06-08 1970-06-08

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US3695592A true US3695592A (en) 1972-10-03

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US44302A Expired - Lifetime US3695592A (en) 1970-06-08 1970-06-08 Plate-type air valve carburetor

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US (1) US3695592A (2)
CA (1) CA929433A (2)
DE (1) DE2128489A1 (2)
FR (1) FR2096043A5 (2)
GB (1) GB1348551A (2)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2082293A (en) * 1935-06-12 1937-06-01 Linga Torbjorn Carburetor
US2152951A (en) * 1935-02-25 1939-04-04 Robert F Bracke Carburetor
US2443464A (en) * 1943-06-07 1948-06-15 R D Fageol Co Carburetor
US2777678A (en) * 1953-07-28 1957-01-15 Holley Carburetor Co Carburetor
US3147320A (en) * 1961-05-16 1964-09-01 Enginering Res And Applic Ltd Carburetors
US3182974A (en) * 1963-09-05 1965-05-11 Hill Raymond Roger Carburetor
US3232315A (en) * 1963-07-22 1966-02-01 Task Corp Low flow rate responsive damper valve
US3281131A (en) * 1962-12-27 1966-10-25 Sibe Carburetting devices for internal combustion engines
US3398937A (en) * 1966-07-08 1968-08-27 Gen Motors Corporeation Carburetor
US3512508A (en) * 1968-05-08 1970-05-19 Bendix Corp Internal combustion engine charge formation and induction system

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2152951A (en) * 1935-02-25 1939-04-04 Robert F Bracke Carburetor
US2082293A (en) * 1935-06-12 1937-06-01 Linga Torbjorn Carburetor
US2443464A (en) * 1943-06-07 1948-06-15 R D Fageol Co Carburetor
US2777678A (en) * 1953-07-28 1957-01-15 Holley Carburetor Co Carburetor
US3147320A (en) * 1961-05-16 1964-09-01 Enginering Res And Applic Ltd Carburetors
US3281131A (en) * 1962-12-27 1966-10-25 Sibe Carburetting devices for internal combustion engines
US3232315A (en) * 1963-07-22 1966-02-01 Task Corp Low flow rate responsive damper valve
US3182974A (en) * 1963-09-05 1965-05-11 Hill Raymond Roger Carburetor
US3398937A (en) * 1966-07-08 1968-08-27 Gen Motors Corporeation Carburetor
US3512508A (en) * 1968-05-08 1970-05-19 Bendix Corp Internal combustion engine charge formation and induction system

Also Published As

Publication number Publication date
CA929433A (en) 1973-07-03
DE2128489A1 (de) 1971-12-16
GB1348551A (en) 1974-03-20
FR2096043A5 (2) 1972-02-11

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