WO2011068452A1 - Throttle housing and carburettor - Google Patents

Throttle housing and carburettor Download PDF

Info

Publication number
WO2011068452A1
WO2011068452A1 PCT/SE2010/000283 SE2010000283W WO2011068452A1 WO 2011068452 A1 WO2011068452 A1 WO 2011068452A1 SE 2010000283 W SE2010000283 W SE 2010000283W WO 2011068452 A1 WO2011068452 A1 WO 2011068452A1
Authority
WO
WIPO (PCT)
Prior art keywords
throttle
intake duct
throttle housing
side edge
housing
Prior art date
Application number
PCT/SE2010/000283
Other languages
French (fr)
Inventor
Michael Blixt
Original Assignee
Michael Blixt
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Michael Blixt filed Critical Michael Blixt
Publication of WO2011068452A1 publication Critical patent/WO2011068452A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/12—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having slidably-mounted valve members; having valve members movable longitudinally of conduit
    • F02D9/16—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having slidably-mounted valve members; having valve members movable longitudinally of conduit the members being rotatable
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • F02M69/044—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the intake conduit downstream of an air throttle valve
    • 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
    • F02M9/00—Carburettors having air or fuel-air mixture passage throttling valves other than of butterfly type; Carburettors having fuel-air mixing chambers of variable shape or position
    • F02M9/08—Carburettors having air or fuel-air mixture passage throttling valves other than of butterfly type; Carburettors having fuel-air mixing chambers of variable shape or position having throttling valves rotatably mounted in the passage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/22—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution
    • F16K3/24—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/30—Details
    • F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/04—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having cylindrical surfaces; Packings therefor
    • F16K5/0428—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having cylindrical surfaces; Packings therefor with a cylindrical segment mounted around a supply pipe

Definitions

  • the present invention relates to a throttle housing of an internal combustion engine, having an intake duct that at its one end communicates with at least one intake port of the engine, and at least one throttle that is turnable into and out of, respectively, said intake duct around at least one turning shaft.
  • the present invention also relates to a carburettor of an internal combustion engine.
  • Throttle housings and carburettors of internal combustion engines with fuel injection by a fuel injector are available in numerous different embodiments.
  • the fuel injection can take place by a fuel injector for each cylinder of the engine, as well as by a common fuel injector connected to an intake manifold common to all cylinders.
  • An example of the latter solution is seen in US, A, 4 378 001 , wherein the fuel injector mouths immediately after a circular throttle that is turnable around a shaft that extends transversely through the intake duct of the carburettor in the traditional way.
  • a control unit i.e., a control computer
  • indicated data is conveyed regarding, e.g., negative pressure on the intake side of the carburettor, usually from the air filter cap, the temperature of the engine, usually the temperature of the cooling water, the ignition position and the position of the throttle.
  • a control unit i.e., a control computer
  • indicated data is conveyed regarding, e.g., negative pressure on the intake side of the carburettor, usually from the air filter cap, the temperature of the engine, usually the temperature of the cooling water, the ignition position and the position of the throttle.
  • a gauge which indicates the throttle position at different throttle speeds.
  • Such a throttle has, however, a disadvantage in that it does not give free air throughput at full throttle speed.
  • a throttle of the kind mentioned above does not allow as short a length of the intake duct as is desired.
  • a cylindrical throttle having a circular opening allows free throughput, but also entails that the intake duct has to be relatively long to accommodate the diameter of the entire throttle.
  • a plane slide throttle allows the provision of a very short intake duct, but has the disadvantage that it requires the carburettor body to have such a height that the throttle can be pulled out entirely from the intake duct to give free air throughput. In such a construction, the carburettor body becomes very bulky, which is a disadvantage in narrow engine compartments.
  • a throttle having a throttle plate in the form of a section of a cylindrical sleeve is disclosed, which is arranged to be swung into and out from, respectively, the intake duct.
  • This type of throttle allows the intake duct to be given a relatively short length.
  • the throttle is carried by two swinging arms, which are arranged on a common shaft that extends through the intake duct. This entails that the intake duct does not allow free throughput since the swinging arms as well as the swing shaft are in the intake duct when the throttle is entirely swung-out.
  • a first object of the present invention is to provide a throttle housing that does not have the above mentioned disadvantages but has the advantage of the throttle mentioned closest above.
  • a second object of the present invention is to provide a carburettor that does not have the above mentioned disadvantages but has the advantage of the throttle mentioned closest above.
  • the invention embraces a throttle housing for an internal combustion engine, having an intake duct that at its one end communicates with at least one intake port of the engine, and at least one throttle that is turnable into and out of, respectively, said intake duct around at least one turning shaft.
  • Said throttle has at least one throttle plate in the form of a section of an essentially cylindrical sleeve, which is suspended in at least one swinging arm arranged on the outside of said intake duct, and which throttle plate is swingable into and out of, respectively, said intake duct.
  • Two swinging arms may support the throttle plate and be turnable in a shaft journal each, which have a common turning shaft that extends essentially perpendicular to the longitudinal direction of the intake duct, and a position indicator may be connected with at least one of the shaft journals and be arranged to indicate the position of the throttle and to output indicated data to a control unit.
  • a fuel injector may be arranged to mouth in the intake duct.
  • the intake duct may have a venturi section, and the fuel injector may be arranged to mouth in the venturi section.
  • At least one of said shaft journals may be mounted in at least one ball bearing.
  • Said section may have a first side edge, which is first swingable into and last swingable out of said intake duct.
  • Said section may have a second side edge situated essentially opposite said first side edge.
  • Said first side edge may have an essentially convex shape in the swinging direction inward toward said intake duct.
  • Said convex shape may be a portion of a circular arc.
  • Said portion of a circular arc may extend from at least one essentially straight edge portion in such a way that said portion of a circular arc and said at least one straight edge portion together constitute said first side edge of said section.
  • Said portion of a circular arc may have a shape complementary to the inside of said intake duct.
  • Said portion of a circular arc may be a semi-circular arc.
  • Said first side edge may have an essentially straight shape in the swinging direction inward toward said intake duct, said first side edge extending essentially perpendicular to the longitudinal direction of the intake duct and simultaneously essentially perpendicular to the swinging direction.
  • Said first side edge may have an essentially concave shape in the swinging direction inward toward said intake duct.
  • Said intake duct may have an essentially circular shape in cross- section.
  • the throttle housing may have at least one first recess for said throttle plate, which recess opens toward said intake duct and which allows said throttle plate to be entirely swung out of said intake duct for a maximally open position.
  • the throttle housing may have at least one second recess for at least a portion of said throttle plate, which recess opens toward said intake duct and which allows said throttle plate to principally seal against the inside of said intake duct for a maximally closed position also in the case said first side edge of said section does not have a shape complementary to the inside of said intake duct.
  • Said at least one first recess and said at least one second recess may together constitute at least one continuous recess in the throttle housing.
  • the invention also embraces a carburettor for an internal combustion engine and that comprises at least one throttle housing according to the above.
  • the intake duct allows an entirely free throughput at full throttle speed at the same time as the intake duct can be made very short and the throttle housing built low in height.
  • the fuel injection may also be controlled by means of a position indicator that is connected with the throttle.
  • Figure 1 shows, in a sectioned side view through the intake duct thereof, a carburettor according to the invention comprising a throttle housing according to the invention.
  • Figure 2 shows, in a perspective view, a plate-shaped and turnable throttle included in the carburettor according to Figure .
  • Figure 3 shows, in a sectioned top view, the carburettor according to Figure 1.
  • Figure 4 shows, in a perspective view, a first alternative design of the plate-shaped and turnable throttle according to Figure 2.
  • Figure 5 shows, in a perspective view, a second alternative design of the plate-shaped and turnable throttle according to Figure 2.
  • Figure 6 shows, in a perspective view, a third alternative design of the plate-shaped and turnable throttle according to Figure 2.
  • the carburettor which is shown in the figures, comprises a throttle housing 1 , which in turn has an intake duct 1.1 , the right opening of which in Figure 1 is intended to be connected to an intake port in an internal combustion engine.
  • a throttle 2 having a throttle plate 2.1 in the form of a portion of a cylindrical sleeve is suspended in two swinging arms 2.2, which in turn are turnable in shaft journals 2.3 in the throttle housing 1.
  • the throttle plate 2.1 is movable in a groove 1.2 or a first recess 1.2, which extends around the underside of the intake duct 1.1 (when the intake duct 1.1 is orientated as in the figures), and is shown in Figure 1 in a half-open position.
  • An electronic position indicator 2.4 is arranged on the throttle housing 1 and is connected with one of the shaft journals 2.3 of the throttle 2.
  • the position of the throttle plate 2.1 at different throttle speeds is provided in mechanical way, e.g., via a throttle cable, which runs over a cable pulley 2.5 arranged on the other of the shaft journals of the throttle 2, by means of a throttle lever.
  • These devices are of a known type and are not shown in the figures.
  • the two shaft journals 2.3 are mounted in the throttle housing 1 in ball bearings 5.
  • a fuel injector 4 is arranged at the most slender portion of a venturi section in the intake duct 1.1 and directed at an inclination to the intake port of the engine.
  • the fuel injector 4 is arranged straight above the point in the intake duct 1.1 where the throttle plate 2.1 meets the top wall in the intake duct 1.1 , see Figure 1.
  • the fuel injector 4 communicates with an injection pump (not shown) for fuel.
  • the intake duct 1.1 has an essentially circular shape in cross- section, while other shapes still are feasible.
  • the throttle plate 2.1 may have different geometries, see the
  • a first side edge 6 is the one of the side edges of the throttle plate 2.1 that first swings into (enters into) and last swings out of (exits from) the intake duct 1.1 when the throttle plate 2.1 is brought to move in closing and opening, respectively, direction. If the first side edge 6 looks like in Figure 2, no (or a very small) recess is needed in the throttle housing 1 on the upper side of the intake duct 1.1 (when the intake duct 1.1 is orientated as in the figures) to receive the first side edge 6 entirely or partly in a closed position of the throttle housing.
  • first side edge 6 having a convex shape in the swinging direction inward toward the intake duct 1.1 in the form of a portion 8 of a circular arc, which portion 8 has a shape complementary to the inside of the intake duct 1.1 and which portion 8 is a semi-circular arc (or very close to a semi-circular arc).
  • a second recess (not shown) is needed in the throttle housing 1 on the upper side of the intake duct 1.1 (when the intake duct .1 is orientated as in the figures) to receive the first side edge 6 entirely or partly in a closed position of the throttle housing.
  • the first recess 1.2 extends higher up in the throttle housing 1 than what is seen in Figure 1 , in which case said first recess 1.2 and said second recess accordingly constitute one and the same continuous recess in the throttle housing 1.
  • the first side edge 6 has a convex shape in the swinging direction inward toward the intake duct 1.1 in the form of a portion 8 of a circular arc, which portion 8 has a shape complementary to the inside of the intake duct 1.1 , but the portion 8 represents much less than a semi-circular arc and extends from two essentially straight edge portions 9 in such a way that the portion 8 and the straight edge portions 9 together constitute the first side edge 6.
  • a recess is needed in the throttle housing 1 to receive the straight edge portions 9.
  • the first side edge 6 has an essentially straight shape in the swinging direction inward toward the intake duct 1.1 , the first side edge 6 extending essentially perpendicular to the longitudinal direction of the intake duct 1.1 and simultaneously essentially perpendicular to the swinging direction.
  • the first side edge 6 may naturally also extend in another direction. Thus, here a recess is needed in the throttle housing 1 to receive the major part of the first side edge 6 or the entire first side edge 6.
  • the first side edge 6 has an essentially concave shape in the swinging direction inward toward the intake duct 1.1.
  • a recess is needed in the throttle housing 1 to receive the entire first side edge 6 in order to, by means of the throttle plate 2.1 , be able to close the intake duct 1.1 entirely.
  • a second side edge 7 of the throttle plate 2.1 is situated essentially opposite said first side edge 6.
  • the second side edge 7 has an essentially straight shape but other shapes are also feasible.
  • the second side edge 7 may have a geometry that corresponds to some one of the variants of the first side edge 6 that have been described above.
  • a common variant of the second side edge 7 has an essentially convex shape in the swinging direction out of said intake duct 1.1.
  • the throttle plate 2.1 is manufactured integrally with the swinging arms 2.2 and the shaft journals 2.3.
  • the throttle plate 2.1 has, in the manufacture of throttle housings for speedway engines or the like, a thickness of approx. 1-2 mm, and the material that most often is used is aluminium, but also other materials are feasible.
  • the throttle plate 2.1 In use of the throttle housing and when increasing the gas, the throttle plate 2.1 is turned in the swinging arms 2.2 from a closed position, the turning being indicated by means of the position indicator 2.4. Data concerning the position of the throttle plate 2.1 is recorded in an electronic control unit (not shown), in which the amount of fuel to be emitted from the nozzle 4 is calculated and set based on data on the position of the throttle, the negative pressure in the intake port, the engine temperature, and the ignition position.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

The present invention relates to a throttle housing (1) for an internal combustion engine, having an intake duct (1.1) that at its one end communicates with at least one intake port of the engine, and at least one throttle (2) that is turnable into and out of, respectively, said intake duct (1.1) around at least one turning shaft (2.3). Said throttle (2) has at least one throttle plate (2.1) in the form of a section (2.1) of an essentially cylindrical sleeve, which is suspended in at least one swinging arm (2.2) arranged on the outside of said intake duct (1.1), and which throttle plate (2.1) is swingable into and out of, respectively, said intake duct (1.1). The present invention also relates to a carburettor for an internal combustion engine.

Description

THROTTLE HOUSING AND CARBURETTOR
The present invention relates to a throttle housing of an internal combustion engine, having an intake duct that at its one end communicates with at least one intake port of the engine, and at least one throttle that is turnable into and out of, respectively, said intake duct around at least one turning shaft. The present invention also relates to a carburettor of an internal combustion engine. Prior Art
Throttle housings and carburettors of internal combustion engines with fuel injection by a fuel injector are available in numerous different embodiments. The fuel injection can take place by a fuel injector for each cylinder of the engine, as well as by a common fuel injector connected to an intake manifold common to all cylinders. An example of the latter solution is seen in US, A, 4 378 001 , wherein the fuel injector mouths immediately after a circular throttle that is turnable around a shaft that extends transversely through the intake duct of the carburettor in the traditional way.
It is a desire to easily be able to control the amount of air and injected fuel as a function of engine data, which can be indicated by different kinds of gauges in the engine. The control is carried out by means of a control unit, i.e., a control computer, to which indicated data is conveyed regarding, e.g., negative pressure on the intake side of the carburettor, usually from the air filter cap, the temperature of the engine, usually the temperature of the cooling water, the ignition position and the position of the throttle. In a turnable throttle of the kind mentioned above, it is known to provide the throttle shaft with a gauge, which indicates the throttle position at different throttle speeds. Such a throttle has, however, a disadvantage in that it does not give free air throughput at full throttle speed.
In cases where it is desired to have as short an intake duct as possible, a throttle of the kind mentioned above does not allow as short a length of the intake duct as is desired. A cylindrical throttle having a circular opening allows free throughput, but also entails that the intake duct has to be relatively long to accommodate the diameter of the entire throttle. It is true that a plane slide throttle allows the provision of a very short intake duct, but has the disadvantage that it requires the carburettor body to have such a height that the throttle can be pulled out entirely from the intake duct to give free air throughput. In such a construction, the carburettor body becomes very bulky, which is a disadvantage in narrow engine compartments.
In US, A, 3 682 449, a throttle having a throttle plate in the form of a section of a cylindrical sleeve is disclosed, which is arranged to be swung into and out from, respectively, the intake duct. This type of throttle allows the intake duct to be given a relatively short length. The throttle is carried by two swinging arms, which are arranged on a common shaft that extends through the intake duct. This entails that the intake duct does not allow free throughput since the swinging arms as well as the swing shaft are in the intake duct when the throttle is entirely swung-out.
Summary of the Invention
A first object of the present invention is to provide a throttle housing that does not have the above mentioned disadvantages but has the advantage of the throttle mentioned closest above. A second object of the present invention is to provide a carburettor that does not have the above mentioned disadvantages but has the advantage of the throttle mentioned closest above. Thus, the invention embraces a throttle housing for an internal combustion engine, having an intake duct that at its one end communicates with at least one intake port of the engine, and at least one throttle that is turnable into and out of, respectively, said intake duct around at least one turning shaft. Said throttle has at least one throttle plate in the form of a section of an essentially cylindrical sleeve, which is suspended in at least one swinging arm arranged on the outside of said intake duct, and which throttle plate is swingable into and out of, respectively, said intake duct.
Two swinging arms may support the throttle plate and be turnable in a shaft journal each, which have a common turning shaft that extends essentially perpendicular to the longitudinal direction of the intake duct, and a position indicator may be connected with at least one of the shaft journals and be arranged to indicate the position of the throttle and to output indicated data to a control unit. A fuel injector may be arranged to mouth in the intake duct. The intake duct may have a venturi section, and the fuel injector may be arranged to mouth in the venturi section. At least one of said shaft journals may be mounted in at least one ball bearing.
Said section may have a first side edge, which is first swingable into and last swingable out of said intake duct. Said section may have a second side edge situated essentially opposite said first side edge. Said first side edge may have an essentially convex shape in the swinging direction inward toward said intake duct. Said convex shape may be a portion of a circular arc. Said portion of a circular arc may extend from at least one essentially straight edge portion in such a way that said portion of a circular arc and said at least one straight edge portion together constitute said first side edge of said section. Said portion of a circular arc may have a shape complementary to the inside of said intake duct. Said portion of a circular arc may be a semi-circular arc.
Said first side edge may have an essentially straight shape in the swinging direction inward toward said intake duct, said first side edge extending essentially perpendicular to the longitudinal direction of the intake duct and simultaneously essentially perpendicular to the swinging direction. Said first side edge may have an essentially concave shape in the swinging direction inward toward said intake duct.
Said intake duct may have an essentially circular shape in cross- section. The throttle housing may have at least one first recess for said throttle plate, which recess opens toward said intake duct and which allows said throttle plate to be entirely swung out of said intake duct for a maximally open position. The throttle housing may have at least one second recess for at least a portion of said throttle plate, which recess opens toward said intake duct and which allows said throttle plate to principally seal against the inside of said intake duct for a maximally closed position also in the case said first side edge of said section does not have a shape complementary to the inside of said intake duct. Said at least one first recess and said at least one second recess may together constitute at least one continuous recess in the throttle housing.
Thus, the invention also embraces a carburettor for an internal combustion engine and that comprises at least one throttle housing according to the above.
By the throttle housing and the carburettor, respectively, according to the invention, it is achieved that the intake duct allows an entirely free throughput at full throttle speed at the same time as the intake duct can be made very short and the throttle housing built low in height. The fuel injection may also be controlled by means of a position indicator that is connected with the throttle.
List of Figures
Figure 1 shows, in a sectioned side view through the intake duct thereof, a carburettor according to the invention comprising a throttle housing according to the invention.
Figure 2 shows, in a perspective view, a plate-shaped and turnable throttle included in the carburettor according to Figure .
Figure 3 shows, in a sectioned top view, the carburettor according to Figure 1.
Figure 4 shows, in a perspective view, a first alternative design of the plate-shaped and turnable throttle according to Figure 2.
Figure 5 shows, in a perspective view, a second alternative design of the plate-shaped and turnable throttle according to Figure 2.
Figure 6 shows, in a perspective view, a third alternative design of the plate-shaped and turnable throttle according to Figure 2.
Description of Embodiments
The carburettor, which is shown in the figures, comprises a throttle housing 1 , which in turn has an intake duct 1.1 , the right opening of which in Figure 1 is intended to be connected to an intake port in an internal combustion engine. A throttle 2 having a throttle plate 2.1 in the form of a portion of a cylindrical sleeve is suspended in two swinging arms 2.2, which in turn are turnable in shaft journals 2.3 in the throttle housing 1. The throttle plate 2.1 is movable in a groove 1.2 or a first recess 1.2, which extends around the underside of the intake duct 1.1 (when the intake duct 1.1 is orientated as in the figures), and is shown in Figure 1 in a half-open position. An electronic position indicator 2.4 is arranged on the throttle housing 1 and is connected with one of the shaft journals 2.3 of the throttle 2. The position of the throttle plate 2.1 at different throttle speeds is provided in mechanical way, e.g., via a throttle cable, which runs over a cable pulley 2.5 arranged on the other of the shaft journals of the throttle 2, by means of a throttle lever. These devices are of a known type and are not shown in the figures. The two shaft journals 2.3 are mounted in the throttle housing 1 in ball bearings 5.
A fuel injector 4 is arranged at the most slender portion of a venturi section in the intake duct 1.1 and directed at an inclination to the intake port of the engine. The fuel injector 4 is arranged straight above the point in the intake duct 1.1 where the throttle plate 2.1 meets the top wall in the intake duct 1.1 , see Figure 1. The fuel injector 4 communicates with an injection pump (not shown) for fuel.
The intake duct 1.1 has an essentially circular shape in cross- section, while other shapes still are feasible.
The throttle plate 2.1 may have different geometries, see the
Figures 2 and 4-6. A first side edge 6 is the one of the side edges of the throttle plate 2.1 that first swings into (enters into) and last swings out of (exits from) the intake duct 1.1 when the throttle plate 2.1 is brought to move in closing and opening, respectively, direction. If the first side edge 6 looks like in Figure 2, no (or a very small) recess is needed in the throttle housing 1 on the upper side of the intake duct 1.1 (when the intake duct 1.1 is orientated as in the figures) to receive the first side edge 6 entirely or partly in a closed position of the throttle housing. This depends on the first side edge 6 having a convex shape in the swinging direction inward toward the intake duct 1.1 in the form of a portion 8 of a circular arc, which portion 8 has a shape complementary to the inside of the intake duct 1.1 and which portion 8 is a semi-circular arc (or very close to a semi-circular arc). However, if the first side edge 6 looks like in some one of the Figures 4-6, a second recess (not shown) is needed in the throttle housing 1 on the upper side of the intake duct 1.1 (when the intake duct .1 is orientated as in the figures) to receive the first side edge 6 entirely or partly in a closed position of the throttle housing. Alternatively, it is required that the first recess 1.2 extends higher up in the throttle housing 1 than what is seen in Figure 1 , in which case said first recess 1.2 and said second recess accordingly constitute one and the same continuous recess in the throttle housing 1.
According to Figure 4, it is true that the first side edge 6 has a convex shape in the swinging direction inward toward the intake duct 1.1 in the form of a portion 8 of a circular arc, which portion 8 has a shape complementary to the inside of the intake duct 1.1 , but the portion 8 represents much less than a semi-circular arc and extends from two essentially straight edge portions 9 in such a way that the portion 8 and the straight edge portions 9 together constitute the first side edge 6. Thus, here a recess is needed in the throttle housing 1 to receive the straight edge portions 9.
According to Figure 5, the first side edge 6 has an essentially straight shape in the swinging direction inward toward the intake duct 1.1 , the first side edge 6 extending essentially perpendicular to the longitudinal direction of the intake duct 1.1 and simultaneously essentially perpendicular to the swinging direction. The first side edge 6 may naturally also extend in another direction. Thus, here a recess is needed in the throttle housing 1 to receive the major part of the first side edge 6 or the entire first side edge 6.
According to Figure 6, the first side edge 6 has an essentially concave shape in the swinging direction inward toward the intake duct 1.1. Thus, here a recess is needed in the throttle housing 1 to receive the entire first side edge 6 in order to, by means of the throttle plate 2.1 , be able to close the intake duct 1.1 entirely.
A second side edge 7 of the throttle plate 2.1 is situated essentially opposite said first side edge 6. In the figures, the second side edge 7 has an essentially straight shape but other shapes are also feasible. For instance, the second side edge 7 may have a geometry that corresponds to some one of the variants of the first side edge 6 that have been described above. A common variant of the second side edge 7 has an essentially convex shape in the swinging direction out of said intake duct 1.1.
The throttle plate 2.1 is manufactured integrally with the swinging arms 2.2 and the shaft journals 2.3. The throttle plate 2.1 has, in the manufacture of throttle housings for speedway engines or the like, a thickness of approx. 1-2 mm, and the material that most often is used is aluminium, but also other materials are feasible.
In use of the throttle housing and when increasing the gas, the throttle plate 2.1 is turned in the swinging arms 2.2 from a closed position, the turning being indicated by means of the position indicator 2.4. Data concerning the position of the throttle plate 2.1 is recorded in an electronic control unit (not shown), in which the amount of fuel to be emitted from the nozzle 4 is calculated and set based on data on the position of the throttle, the negative pressure in the intake port, the engine temperature, and the ignition position.
The invention is not limited to the embodiments shown herein, but may be varied within the scope of the subsequent claims.

Claims

1. Throttle housing ( ) for an internal combustion engine, having an intake duct (1.1 ) that at its one end communicates with at least one intake port of the engine, and at least one throttle (2) that is turnable into and out of, respectively, said intake duct (1.1 ) around at least one turning shaft (2.3), characterized in that said throttle (2) has at least one throttle plate (2.1 ) in the form of a section (2.1 ) of an essentially cylindrical sleeve, which is suspended in at least one swinging arm (2.2) arranged on the outside of said intake duct (1.1 ), and which throttle plate (2.1 ) is swingable into and out of, respectively, said intake duct (1.1 ).
2. Throttle housing (1 ) according to claim 1 , characterized in that two swinging arms (2.2) support the throttle plate (2.1 ) and are turnable in a shaft journal (2.3) each, which have a common turning shaft that extends essentially perpendicular to the longitudinal direction of the intake duct (1.1 ), and that a position indicator (2.4) is connected with at least one of the shaft journals (2.3) and is arranged to indicate the position of the throttle (2) and to output indicated data to a control unit.
3. Throttle housing (1 ) according to any one of the preceding claims, characterized in that a fuel injector (4) is arranged to mouth in the intake duct (1.1 ).
4. Throttle housing (1 ) according to claim 3, characterized in that the intake duct (1.1 ) has a venturi section, and that the fuel injector (4) is arranged to mouth in the venturi section.
5. Throttle housing (1 ) according to claim 2, characterized in that at least one of said shaft journals (2.3) is mounted in at least one ball bearing
(5).
6. Throttle housing (1 ) according to claim 1 , characterized in that said section (2.1 ) has a first side edge (6), which is first swingable into and last swingable out of said intake duct (1.1 ).
7. Throttle housing (1 ) according to claim 6, characterized in that said section (2.1 ) has a second side edge (7) situated essentially opposite said first side edge (6).
8. Throttle housing (1 ) according to claim 6, characterized in that said first side edge (6) has an essentially convex shape in the swinging direction inward toward said intake duct (1.1 ).
9. Throttle housing (1 ) according to claim 8, characterized in that said convex shape is a portion (8) of a circular arc.
10. Throttle housing (1 ) according to claim 9, characterized in that said portion (8) of a circular arc extends from at least one essentially straight edge portion (9) in such a way that said portion (8) of a circular arc and said at least one straight edge portion (9) together constitute said first side edge (6) of said section (2.1 ).
11. Throttle housing (1 ) according to claim 9, characterized in that said portion (8) of a circular arc has a shape complementary to the inside of said intake duct (1.1 ).
12. Throttle housing (1 ) according to claim 9, characterized in that said portion (8) of a circular arc is a semi-circular arc.
13. Throttle housing (1 ) according to claim 6, characterized in that said first side edge (6) has an essentially straight shape in the swinging direction inward toward said intake duct (1.1 ), said first side edge (6) extending essentially perpendicular to the longitudinal direction of the intake duct (1.1 ) and simultaneously essentially perpendicular to the swinging direction.
14. Throttle housing (1 ) according to claim 6, characterized in that said first side edge (6) has an essentially concave shape in the swinging direction inward toward said intake duct ( .1 ).
15. Throttle housing (1 ) according to claim 1 , characterized in that said intake duct (1.1 ) has an essentially circular shape in cross-section.0
16. Throttle housing (1 ) according to claim 1 , characterized by at least one first recess (1.2) for said throttle plate (2.1 ), which recess (1.2) opens toward said intake duct (1.1 ) and which allows said throttle plate (2.1 ) to be entirely swung out of said intake duct (1.1 ) for a maximally open
5 position.
17. Throttle housing (1 ) according to claim 16, characterized by at least one second recess for at least a portion of said throttle plate (2.1 ), which recess opens toward said intake duct (1.1 ) and which allows said
0 throttle plate (2.1 ) to principally seal against the inside of said intake duct
(1.1 ) for a maximally closed position also in the case said first side edge (6) of said section (2.1 ) does not have a shape complementary to the inside of said intake duct (1.1 ). 5
18. Throttle housing (1 ) according to claim 17, characterized in that said at least one first recess (1.2) and said at least one second recess together constitute at least one continuous recess in the throttle housing (1 ).
19. Carburettor for an internal combustion engine, characterized in o that it comprises at least one throttle housing (1 ) according to any one of the preceding claims.
PCT/SE2010/000283 2009-12-04 2010-12-03 Throttle housing and carburettor WO2011068452A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0901522A SE0901522A1 (en) 2009-12-04 2009-12-04 Carburetor for an internal combustion engine
SE0901522-3 2009-12-04

Publications (1)

Publication Number Publication Date
WO2011068452A1 true WO2011068452A1 (en) 2011-06-09

Family

ID=44115152

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2010/000283 WO2011068452A1 (en) 2009-12-04 2010-12-03 Throttle housing and carburettor

Country Status (2)

Country Link
SE (1) SE0901522A1 (en)
WO (1) WO2011068452A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBS20120153A1 (en) * 2012-10-29 2014-04-30 Ind Saleri Italo Spa REMOVABLE VALVE GROUP WITH IMPROVED SHUTTER
WO2022037804A1 (en) * 2020-08-21 2022-02-24 Caterpillar Energy Solutions Gmbh Rotary valve

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2754095A (en) * 1953-09-16 1956-07-10 Thummel Erich Carburetor
DE924002C (en) * 1952-12-16 1957-01-03 Erich Thuemmel Air-controlled float carburetor for gasoline engines
GB2285486A (en) * 1994-01-05 1995-07-12 Ind De Precision Arbeo S A Carburettor throttle valve and starter assembly.
EP0856649A2 (en) * 1997-01-31 1998-08-05 Yamaha Hatsudoki Kabushiki Kaisha Four-cycle engine and engine operation control unit
US20100251987A1 (en) * 2009-04-06 2010-10-07 Denso Corporation Air intake device for internal combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE924002C (en) * 1952-12-16 1957-01-03 Erich Thuemmel Air-controlled float carburetor for gasoline engines
US2754095A (en) * 1953-09-16 1956-07-10 Thummel Erich Carburetor
GB2285486A (en) * 1994-01-05 1995-07-12 Ind De Precision Arbeo S A Carburettor throttle valve and starter assembly.
EP0856649A2 (en) * 1997-01-31 1998-08-05 Yamaha Hatsudoki Kabushiki Kaisha Four-cycle engine and engine operation control unit
US20100251987A1 (en) * 2009-04-06 2010-10-07 Denso Corporation Air intake device for internal combustion engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBS20120153A1 (en) * 2012-10-29 2014-04-30 Ind Saleri Italo Spa REMOVABLE VALVE GROUP WITH IMPROVED SHUTTER
WO2014068417A1 (en) * 2012-10-29 2014-05-08 Industrie Saleri Italo S.P.A. Extractable valve group with improved obturator
WO2022037804A1 (en) * 2020-08-21 2022-02-24 Caterpillar Energy Solutions Gmbh Rotary valve

Also Published As

Publication number Publication date
SE0901522A1 (en) 2011-06-05

Similar Documents

Publication Publication Date Title
US20060163755A1 (en) Carburetor
KR890702003A (en) Heated air flow meter
DE69917345D1 (en) Carburetor for two-stroke internal combustion engines
JPS61138824A (en) Suct1on pipe length variable type suction device for multicylinder internal-combustion engine
ATE420280T1 (en) VARIABLE SHAPE INTAKE MANIFOLD FOR AN INTERNAL COMBUSTION ENGINE
US20090050094A1 (en) Intake control device for internal combustion engine
US20200248635A1 (en) Low pressure fuel injection system for a multi-cylinder light-duty internal combustion engine
US7171933B2 (en) Intake system for a combustion engine with at least two rows of cylinder heads
WO2011068452A1 (en) Throttle housing and carburettor
US4418676A (en) Carburetion system for a V-type internal combustion engine
US4463711A (en) Carburetion system for a V-type internal combustion engine
JP6014565B2 (en) engine
JP5145187B2 (en) Intake device for internal combustion engine
US1740917A (en) Carburetor for internal-combustion engines
CN100396897C (en) Internal combustion engine air intake structure
EP1065360A3 (en) Plastic throttle body
JP5449013B2 (en) Air cleaner for 2-cycle engines
JPS58110847A (en) Rotary throttle valve type carburetor
EP1269002B1 (en) Carburettor for an internal combustion engine
WO2021002041A1 (en) Intake passage structure of stratified scavenging engine
CN113795659B (en) Inflation forming device with throttle valve
JP2006161776A (en) Carburetor for stratified scavenging
US20040070089A1 (en) Carburetor for an internal combustion engine
US20080224335A1 (en) Carburetor for stratified charge two-cycle engine
JP6042296B2 (en) engine

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10834829

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 10834829

Country of ref document: EP

Kind code of ref document: A1