EP0517584B1 - Throttle valve body for a fuel admission device for an engine - Google Patents

Throttle valve body for a fuel admission device for an engine Download PDF

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Publication number
EP0517584B1
EP0517584B1 EP19920401514 EP92401514A EP0517584B1 EP 0517584 B1 EP0517584 B1 EP 0517584B1 EP 19920401514 EP19920401514 EP 19920401514 EP 92401514 A EP92401514 A EP 92401514A EP 0517584 B1 EP0517584 B1 EP 0517584B1
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EP
European Patent Office
Prior art keywords
throttle valve
axis
valve member
body according
valve body
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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.)
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EP19920401514
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German (de)
French (fr)
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EP0517584A1 (en
Inventor
Daniel Levy
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Solex SA
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Solex SA
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    • 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
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/1035—Details of the valve housing
    • F02D9/104—Shaping of the flow path in the vicinity of the flap, e.g. having inserts in the housing
    • 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
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/1005—Details of the flap
    • F02D9/102—Details of the flap the flap having movable parts fixed onto it

Definitions

  • the subject of the present invention is a throttle body for a fuel supply device for an internal combustion engine and it finds a particularly important application in throttle bodies for an injection device comprising electronic means for controlling the quantity of fuel introduced. at each engine operating cycle. However, it can also be used in other cases, and in particular when the throttle body belongs to a carburetion device controlled by electronic means.
  • a throttle body conventionally comprises a housing in which is formed an intake duct and a substantially circular disc-shaped butterfly, mounted on a median shaft of rotation about an axis transverse to the duct and movable between an open position minimum, possibly zero, and a maximum open position for which the butterfly is oriented parallel to the axis of the duct.
  • the quantity of fuel injected per cycle must be proportional to the air flow admitted to the engine.
  • Many injection devices used today include electronic means for calculating the air flow from signals indicating the degree of opening of the throttle valve (supplied for example by a potentiometer) and the pressure difference between the 'upstream and downstream of the butterfly, representative of the air speed.
  • the butterfly In the usual butterfly bodies the butterfly has a constant thickness and the duct is in the form of a circular cylinder in the area where the butterfly moves.
  • the passage section offered to the air increases rapidly during the initial angular displacement of the throttle from its minimum opening position, especially when this minimum opening is practically zero.
  • satisfactory control of the motor at low loads that is to say for small throttle openings
  • the initial increase in the passage section be very gradual.
  • driving pleasure is practically obtained, in the case of an electronically controlled injection device, only with an initial variation in the air flow as a function of the throttle opening angle. having the shape shown diagrammatically in thick lines in FIG. 1.
  • progressiveness is ensured by substituting the direct control of the throttle valve from the accelerator pedal with a control via a linkage having complex kinematics, the numerous joints of which impair the precision of the control, because from the accumulation of games.
  • a butterfly body of the kind defined in the second paragraph of the description which also includes a cover placed in the intake duct, and rotatably mounted around an axis parallel to the axis of rotation of the butterfly and offset from this axis, the cover having an asymmetry with respect to its axis, on one side of which it has a first wing intended to close off a fraction of the cross section of the intake duct, when the position of the butterfly relative to its minimum open position forms an angle less than a determined angle, the cover being linked to the butterfly by a connection mechanical to cause the progressive forced opening of the cover when the movement of the butterfly from its minimum open position exceeds said determined angle.
  • the present invention aims to provide a throttle body of the type known by JP-A-58 202 338, and using only simple means to vary only very gradually the cross section of the air, in particular during of the initial opening of the butterfly.
  • the throttle body is characterized in that the seal is such that the air passing through the intake duct tends to bring its first wing into its position for closing said fraction of the section of the duct, and in that it has, on the other side of its axis housed in the housing, a second wing constituting a cam of shape such that the butterfly comes to bear on it when its movement exceeds said determined angle.
  • the butterfly drives, by a simple press, the cover in the direction of opening when the determined angle is exceeded.
  • Such an embodiment is particularly simple. This is not the only possible: the coupling between butterfly and cover can be achieved by other mechanical means.
  • the axis around which the cover rotates and the axis of the butterfly shaft advantageously have a relative position such that the butterfly comes to bear against the first wing of the cover and drives it towards its closed position when the throttle returns to its minimum open position.
  • the cover is returned to its closed position not only by the air current, whose action on the first wing is greater than the action on the second wing, but also by positive action of the butterfly.
  • a spring can also be provided to urge the cover towards its closed position.
  • the cover can be drawn so that, when closed, its plane makes a sufficient angle with a plane orthogonal to the axis of the duct; a stop can be provided to limit the angular displacement of the cover in the closing direction; the sliding of the cover against the wall of the intake duct and / or against the butterfly can be facilitated by constituting the cover in a material with a low coefficient of friction, such as a charged synthetic material.
  • the two wings of the cover can be drawn so that, by their support against the wings of the butterfly, they limit the angular displacement of the latter from its minimum open position to stop it when it has reached its fully open position.
  • the throttle body shown in Figures 2 and 3 comprises a housing in which is formed a passage constituting a portion of the air intake duct to the engine.
  • a shaft 12 which crosses the intake duct 10 along a diameter carries a butterfly 14 in the form of a flat disc.
  • the butterfly 14 is for example fixed in a slot of the shaft 12 by two screws 16.
  • the butterfly is angularly movable between a minimum open position, practically zero, where it makes an angle ⁇ 0 with a plane orthogonal to the axis of the conduit 10, and a maximum open position (Figure 6) where it is oriented parallel to the axis of the duct and the flow of air F along the duct.
  • the butterfly can be driven by any of the usual linkage types.
  • this linkage comprises a lever 18 fixed to the shaft 12 and connected by a cable to an accelerator pedal.
  • the device is completed by return springs, not shown.
  • the shaft is also fixed, in many cases, to the cursor of a potentiometer constituting a throttle position sensor.
  • the duct shown in FIG. 2 has a converging zone 20, of revolution so that it can be machined easily, from the position that occupies the downstream side of the resting butterfly. This measure further improves progressiveness.
  • the throttle body according to the invention shown in FIGS. 2 to 6 comprises a cover 22 rotatable about an axis 24 parallel to the axis of rotation of the butterfly, but offset from this axis downstream and also towards the wing of the butterfly which moves upstream during opening.
  • the cover is for example mounted with gentle friction on a rod 26 fitted into the body. It can also include two journals rotating in bearings placed in the housing. At least in the case, which will be described in detail below, where the cover is driven directly by the butterfly, it is desirable to constitute the cover in a material with a low coefficient of friction, such as a charged synthetic material. .
  • the cover 22 has two wings 28 and 30. These wings are designed so as to fulfill several functions.
  • the wing 28 has a shape such that the cover remains in the rest position where it is shown in Figures 2, 3 and 4 as long as the butterfly has not reached a position making an angle ⁇ 1, which will generally be understood between 35 and 55 °, with a plane orthogonal to the axis of the duct.
  • the first wing 28 of the cover (wing rotating upstream in the case of FIG. 2) is provided for closing off a fraction of the intake duct during the initial opening of the butterfly valve.
  • the edge of this first wing 28 is designed to bear against the wall of the intake duct 10 and is dimensioned relative to the butterfly so that the butterfly is in abutment on it when the cover is closed and the butterfly in its minimum opening position ( Figure 2).
  • the second wing 30 of the cover has a profile such that the butterfly 14 comes to rest on it and cause the forced opening of the cover when the angle of the butterfly exceeds ⁇ 1.
  • This second wing therefore constitutes an actuating cam.
  • the profile of the two wings can be chosen so that the cover also constitutes a full opening stop, preventing the rotation of the butterfly beyond the vertical position corresponding to the maximum flow (Figure 6).
  • Grooves 32 can be made in the cover to allow passage at the ends of the screws 16.
  • the periphery of the second wing is generally designed so as to avoid or reduce air leaks along the shaft 12.
  • the part of the second wing more distant from the axis 24 has a plan shape chosen according to the desired variation in flow characteristics.
  • the second wing can be given a strip shape extending over the entire width of the duct, as indicated in dashes in FIG. 3.
  • the part remote from the axis of the second wing 30 can be limited to a tongue 34 (in phantom in Figure 3).
  • the housing can carry a stop intended to limit the rotation of the cover towards its closed position and to avoid jamming.
  • the relative arrangement of the butterfly and the lid in the direction of flow can be reversed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lift Valve (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Description

La présente invention a pour objet un corps de papillon pour dispositif d'alimentation en combustible de moteur à combustion interne et elle trouve une application particulièrement importante dans les corps de papillon pour dispositif à injection comportant des moyens électroniques de commande de la quantité de combustible introduite à chaque cycle de fonctionnement du moteur. Elle est cependant également utilisable dans d'autre cas, et notamment lorsque le corps de papillon appartient à un dispositif de carburation à commande par des moyens électroniques.The subject of the present invention is a throttle body for a fuel supply device for an internal combustion engine and it finds a particularly important application in throttle bodies for an injection device comprising electronic means for controlling the quantity of fuel introduced. at each engine operating cycle. However, it can also be used in other cases, and in particular when the throttle body belongs to a carburetion device controlled by electronic means.

Un corps de papillon comporte classiquement un boîtier dans lequel est ménagé un conduit d'admission et un papillon en forme de disque sensiblement circulaire, monté sur un arbre médian de rotation autour d'un axe transversal au conduit et déplaçable entre une position d'ouverture minimum, éventuellement nulle, et une position d'ouverture maximum pour laquelle le papillon est orienté parallèlement à l'axe du conduit.A throttle body conventionally comprises a housing in which is formed an intake duct and a substantially circular disc-shaped butterfly, mounted on a median shaft of rotation about an axis transverse to the duct and movable between an open position minimum, possibly zero, and a maximum open position for which the butterfly is oriented parallel to the axis of the duct.

La quantité de combustible injectée par cycle doit être proportionnée au débit d'air admis au moteur. Beaucoup de dispositifs d'injection utilisés à l'heure actuelle comportent des moyens électroniques de calcul du débit d'air à partir de signaux indiquant le degré d'ouverture du papillon (fourni par exemple par un potentiomètre) et la différence de pression entre l'amont et l'aval du papillon, représentative de la vitesse de l'air.The quantity of fuel injected per cycle must be proportional to the air flow admitted to the engine. Many injection devices used today include electronic means for calculating the air flow from signals indicating the degree of opening of the throttle valve (supplied for example by a potentiometer) and the pressure difference between the 'upstream and downstream of the butterfly, representative of the air speed.

Dans les corps de papillon habituels le papillon a une épaisseur constante et le conduit est en forme de cylindre circulaire dans la zone où se déplace le papillon. Dans un tel corps, la section de passage offerte à l'air augmente rapidement lors du déplacement angulaire initial du papillon à partir de sa position d'ouverture minimale, surtout lorsque cette ouverture minimale est pratiquement nulle. Or, une commande satisfaisante du moteur aux faibles charges (c'est-à-dire pour les faibles ouvertures du papillon) exige que l'augmentation initiale de la section de passage soit très progressive. En particulier, l'agrément de conduite n'est pratiquement obtenu, dans le cas d'un dispositif d'injection à commande électronique, qu'avec une variation initiale du débit d'air en fonction de l'angle d'ouverture du papillon présentant la forme schématisée en traits épais sur la figure 1.In the usual butterfly bodies the butterfly has a constant thickness and the duct is in the form of a circular cylinder in the area where the butterfly moves. In such a body, the passage section offered to the air increases rapidly during the initial angular displacement of the throttle from its minimum opening position, especially when this minimum opening is practically zero. However, satisfactory control of the motor at low loads (that is to say for small throttle openings) requires that the initial increase in the passage section be very gradual. In particular, driving pleasure is practically obtained, in the case of an electronically controlled injection device, only with an initial variation in the air flow as a function of the throttle opening angle. having the shape shown diagrammatically in thick lines in FIG. 1.

Généralement, on assure la progressivité en substituant à la commande directe du papillon à partir de la pédale d'accélérateur une commande par l'intermédiaire d'une tringlerie ayant une cinématique complexe dont les nombreuses articulations nuisent à la précision de la commande, du fait de l'accumulation des jeux.Generally, progressiveness is ensured by substituting the direct control of the throttle valve from the accelerator pedal with a control via a linkage having complex kinematics, the numerous joints of which impair the precision of the control, because from the accumulation of games.

On utilise également, pour rendre la commande progressive, un guide solidaire de l'axe de papillon et sur lequel s'enroule le câble relié à la pédale d'accélérateur, ce guide étant en forme de secteur de rayon variable ; l'amélioration obtenue par une telle technique est généralement insuffisante.We also use, to make the progressive control, a guide integral with the throttle axis and on which the cable is wound up, connected to the accelerator pedal, this guide being in the form of a sector of variable radius; the improvement obtained by such a technique is generally insufficient.

Pour fournir un corps de papillon offrant à l'air une section de passage qui n'augmente que très progressivement lors de l'ouverture initiale du papillon, il a déjà été proposé par JP-A-58 202 338, qui est considéré comme l'état de la technique le plus proche, un corps de papillon du genre défini au deuxième alinéa de la description, qui comprend également un opercule placé dans le conduit d'admission, et monté rotatif autour d'un axe parallèle à l'axe de rotation du papillon et décalé de cet axe, l'opercule ayant une dissymétrie par rapport à son axe, d'un côté duquel il présente une première aile destinée à obturer une fraction de la section du conduit d'admission, lorsque la position du papillon par rapport à sa position d'ouverture minimum forme un angle inférieur à un angle déterminé, l'opercule étant lié au papillon par une liaison mécanique pour provoquer l'ouverture forcée progressive de l'opercule lorsque le déplacement du papillon à partir de sa position d'ouverture minimum dépasse ledit angle déterminé.To provide a throttle body offering to the air a passage section which increases only very gradually during the initial opening of the butterfly, it has already been proposed by JP-A-58 202 338, which is considered to be the closest state of the art, a butterfly body of the kind defined in the second paragraph of the description, which also includes a cover placed in the intake duct, and rotatably mounted around an axis parallel to the axis of rotation of the butterfly and offset from this axis, the cover having an asymmetry with respect to its axis, on one side of which it has a first wing intended to close off a fraction of the cross section of the intake duct, when the position of the butterfly relative to its minimum open position forms an angle less than a determined angle, the cover being linked to the butterfly by a connection mechanical to cause the progressive forced opening of the cover when the movement of the butterfly from its minimum open position exceeds said determined angle.

La présente invention vise à fournir un corps de papillon du type connu par JP-A-58 202 338, et ne mettant en oeuvre que des moyens simples pour ne faire varier que très progressivement la section de passage de l'air, en particulier lors de l'ouverture initiale du papillon.The present invention aims to provide a throttle body of the type known by JP-A-58 202 338, and using only simple means to vary only very gradually the cross section of the air, in particular during of the initial opening of the butterfly.

A cet effet, le corps de papillon se caractérise en ce que l'opercule est tel que l'air parcourant le conduit d'admission tend à amener sa première aile dans sa position d'obturation de ladite fraction de la section du conduit, et en ce qu'il présente, de l'autre côté de son axe logé dans le boîtier, une seconde aile constituant une came de forme telle que le papillon vient s'appuyer sur elle lorsque son déplacement dépasse ledit angle déterminé. Ainsi le papillon entraîne, par simple appui, l'opercule dans le sens de l'ouverture lorsque l'angle déterminé est dépassé. Un tel mode de réalisation est particulièrement simple. Ce n'est pas le seul possible : le couplage entre papillon et opercule peut être réalisé par d'autres moyens mécaniques.To this end, the throttle body is characterized in that the seal is such that the air passing through the intake duct tends to bring its first wing into its position for closing said fraction of the section of the duct, and in that it has, on the other side of its axis housed in the housing, a second wing constituting a cam of shape such that the butterfly comes to bear on it when its movement exceeds said determined angle. Thus the butterfly drives, by a simple press, the cover in the direction of opening when the determined angle is exceeded. Such an embodiment is particularly simple. This is not the only possible: the coupling between butterfly and cover can be achieved by other mechanical means.

L'axe autour duquel tourne l'opercule et l'axe de l'arbre de papillon ont avantageusement une position relative telle que le papillon vienne en appui contre la première aile de l'opercule et l'entraîne vers sa position de fermeture lorsque le papillon revient vers sa position d'ouverture minimum. Ainsi l'opercule est ramené vers sa position de fermeture non seulement par le courant d'air, dont l'action sur la première aile est supérieure à l'action sur la seconde aile, mais aussi par action positive du papillon. Un ressort peut être également prévu pour solliciter l'opercule vers sa position de fermeture.The axis around which the cover rotates and the axis of the butterfly shaft advantageously have a relative position such that the butterfly comes to bear against the first wing of the cover and drives it towards its closed position when the throttle returns to its minimum open position. Thus the cover is returned to its closed position not only by the air current, whose action on the first wing is greater than the action on the second wing, but also by positive action of the butterfly. A spring can also be provided to urge the cover towards its closed position.

Pour améliorer encore la progressivité, on peut donner au conduit d'admission, le long du trajet de l'aile du papillon qui ne coopère pas avec l'opercule, une forme convergente à partir de l'emplacement qu'occupe la tranche du papillon lorsque ce dernier est dans sa position d'ouverture minimum.To further improve the progressiveness, one can give to the intake duct, along the path of the butterfly wing which does not cooperate with the cover, a convergent shape from the location occupied by the edge of the butterfly when the latter is in its minimum open position.

Il faut éviter le coincement de l'opercule en position de fermeture. L'opercule peut être dessiné de façon que, lorsqu'il est fermé, son plan fait un angle suffisant avec un plan orthogonal à l'axe du conduit ; une butée peut être prévue pour limiter le déplacement angulaire de l'opercule dans le sens de la fermeture ; le glissement de l'opercule contre la paroi du conduit d'admission et/ou contre le papillon peut être facilité en constituant l'opercule en un matériau à faible coefficient de frottement, tel qu'une matière synthétique chargée.Avoid jamming the cover in the closed position. The cover can be drawn so that, when closed, its plane makes a sufficient angle with a plane orthogonal to the axis of the duct; a stop can be provided to limit the angular displacement of the cover in the closing direction; the sliding of the cover against the wall of the intake duct and / or against the butterfly can be facilitated by constituting the cover in a material with a low coefficient of friction, such as a charged synthetic material.

Enfin les deux ailes de l'opercule peuvent être dessinées de façon que, par leur appui contre les ailes du papillon, elles limitent le déplacement angulaire de ce dernier à partir de sa position d'ouverture minimum pour l'arrêter lorsqu'il a atteint sa position de pleine ouverture.Finally the two wings of the cover can be drawn so that, by their support against the wings of the butterfly, they limit the angular displacement of the latter from its minimum open position to stop it when it has reached its fully open position.

L'invention sera mieux comprise à la lecture de la description qui suit d'un mode particulier de réalisation, donné à titre d'exemple non limitatif. La description se réfère aux dessins qui l'accompagnent, dans lesquels :

  • la figure 1, déjà mentionnée, montre l'allure générale souhaitable d'une courbe de variation du débit d'air Q en fonction de l'angle d'ouverture du papillon, à différence de pression constante entre l'amont et l'aval ;
  • la figure 2 est une vue en coupe, suivant la ligne II-II de la figure 3, d'un corps papillon suivant un mode particulier de réalisation de l'invention, le papillon étant représenté en position de ralenti, c'est-à-dire d'ouverture minimum ;
  • la figure 3 est une vue de dessus de la figure 2 ;
  • les figures 4, 5 et 6, similaires à la figure 2, montrent le papillon respectivement à l'extrémité de la zone d'ouverture sans entraînement de l'opercule, lors de l'entraînement de l'opercule, et en position d'ouverture maximum.
The invention will be better understood on reading the following description of a particular embodiment, given by way of non-limiting example. The description refers to the accompanying drawings, in which:
  • FIG. 1, already mentioned, shows the general desirable appearance of a curve for variation of the air flow rate Q as a function of the opening angle of the butterfly valve, with constant pressure difference between upstream and downstream ;
  • Figure 2 is a sectional view along line II-II of Figure 3, a throttle body according to a particular embodiment of the invention, the throttle being shown in the idle position, that is to say - say minimum opening;
  • Figure 3 is a top view of Figure 2;
  • Figures 4, 5 and 6, similar to Figure 2, show the butterfly respectively at the end of the opening zone without driving the cover, during the drive of the cover, and in the position of maximum opening.

Le corps de papillon montré en figures 2 et 3 comprend un boîtier dans lequel est ménagé un passage constituant une portion du conduit d'admission d'air au moteur. Un arbre 12 qui traverse le conduit d'admission 10 suivant un diamètre porte un papillon 14 en forme de disque plat. Le papillon 14 est par exemple fixé dans une fente de l'arbre 12 par deux vis 16. Le papillon est déplaçable angulairement entre une position d'ouverture minimale, pratiquement nulle, où il fait un angle α₀ avec un plan orthogonal à l'axe du conduit 10, et une position d'ouverture maximale (figure 6) où il est orienté parallèlement à l'axe du conduit et à l'écoulement F de l'air le long du conduit.The throttle body shown in Figures 2 and 3 comprises a housing in which is formed a passage constituting a portion of the air intake duct to the engine. A shaft 12 which crosses the intake duct 10 along a diameter carries a butterfly 14 in the form of a flat disc. The butterfly 14 is for example fixed in a slot of the shaft 12 by two screws 16. The butterfly is angularly movable between a minimum open position, practically zero, where it makes an angle α₀ with a plane orthogonal to the axis of the conduit 10, and a maximum open position (Figure 6) where it is oriented parallel to the axis of the duct and the flow of air F along the duct.

Le papillon peut être entraîné par l'un quelconque des types de tringlerie habituelle. Dans le cas illustré sur la figure 3, cette tringlerie comporte un levier 18 fixé à l'arbre 12 et relié par un câble à une pédale d'accélérateur. Le dispositif est complété par des ressorts de rappel, non représentés. L 'arbre est également fixé, dans de nombreux cas, au curseur d'un potentiomètre constituant un capteur de position du papillon.The butterfly can be driven by any of the usual linkage types. In the case illustrated in FIG. 3, this linkage comprises a lever 18 fixed to the shaft 12 and connected by a cable to an accelerator pedal. The device is completed by return springs, not shown. The shaft is also fixed, in many cases, to the cursor of a potentiometer constituting a throttle position sensor.

Pour rendre l'augmentation de section de passage d'air plus progressive lors de l'ouverture initiale du papillon, le conduit montré en figure 2 comporte une zone convergente 20, de révolution pour pouvoir être usinée aisément, à partir de la position qu'occupe la tranche aval du papillon en repos. Cette mesure améliore encore la progressivité.To make the increase in air passage section more progressive during the initial opening of the butterfly valve, the duct shown in FIG. 2 has a converging zone 20, of revolution so that it can be machined easily, from the position that occupies the downstream side of the resting butterfly. This measure further improves progressiveness.

Le corps de papillon selon l'invention montré en figures 2 à 6 comporte un opercule 22 rotatif autour d'un axe 24 parallèle à l'axe de rotation du papillon, mais décalé de cet axe vers l'aval et également vers l'aile du papillon qui se déplace vers l'amont lors de l'ouverture. L'opercule est par exemple monté à frottement doux sur une tige 26 emmanchée dans le corps. Il peut également comporter deux tourillons tournant dans des coussinets placés dans le boîtier. Au moins dans le cas, qu'on décrira en détail plus loin, où l'opercule est entraîné directement par le papillon, il est souhaitable de constituer l'opercule en un matériau à faible coefficient de frottement, tel qu'une matière synthétique chargée.The throttle body according to the invention shown in FIGS. 2 to 6 comprises a cover 22 rotatable about an axis 24 parallel to the axis of rotation of the butterfly, but offset from this axis downstream and also towards the wing of the butterfly which moves upstream during opening. The cover is for example mounted with gentle friction on a rod 26 fitted into the body. It can also include two journals rotating in bearings placed in the housing. At least in the case, which will be described in detail below, where the cover is driven directly by the butterfly, it is desirable to constitute the cover in a material with a low coefficient of friction, such as a charged synthetic material. .

L'opercule 22 comporte deux ailes 28 et 30. Ces ailes sont dessinées de façon à remplir plusieurs fonctions. L'aile 28 a une forme telle que l'opercule reste dans la position de repos où il est montré en figures 2, 3 et 4 aussi longtemps que le papillon n'a pas atteint une position faisant un angle α₁, qui sera généralement compris entre 35 et 55°, avec un plan orthogonal à l'axe du conduit. La première aile 28 de l'opercule (aile tournant vers l'amont dans le cas de la figure 2) est prévue pour obturer une fraction du conduit d'admission lors de l'ouverture initiale du papillon. La tranche de cette première aile 28 est prévue pour s'appuyer contre la paroi du conduit d'admission 10 et elle est dimensionnée par rapport au papillon de façon que le papillon soit en appui sur elle lorsque l'opercule est fermé et le papillon dans sa position d'ouverture minimum (figure 2).The cover 22 has two wings 28 and 30. These wings are designed so as to fulfill several functions. The wing 28 has a shape such that the cover remains in the rest position where it is shown in Figures 2, 3 and 4 as long as the butterfly has not reached a position making an angle α₁, which will generally be understood between 35 and 55 °, with a plane orthogonal to the axis of the duct. The first wing 28 of the cover (wing rotating upstream in the case of FIG. 2) is provided for closing off a fraction of the intake duct during the initial opening of the butterfly valve. The edge of this first wing 28 is designed to bear against the wall of the intake duct 10 and is dimensioned relative to the butterfly so that the butterfly is in abutment on it when the cover is closed and the butterfly in its minimum opening position (Figure 2).

La seconde aile 30 de l'opercule a un profil tel que le papillon 14 vient s'appuyer sur elle et provoquer l'ouverture forcée de l'opercule lorsque l'angle du papillon dépasse α₁. Cette seconde aile constitue donc une came d'actionnement. Comme le montre la figure 6, le profil des deux ailes peut être choisi pour que l'opercule constitue également une butée de pleine ouverture, empêchant la rotation du papillon au-delà de la position verticale correspondant au débit maximum (figure 6). Des rainures 32 peuvent être ménagées dans l'opercule pour livrer passage aux extrémités des vis 16.The second wing 30 of the cover has a profile such that the butterfly 14 comes to rest on it and cause the forced opening of the cover when the angle of the butterfly exceeds α₁. This second wing therefore constitutes an actuating cam. As shown in Figure 6, the profile of the two wings can be chosen so that the cover also constitutes a full opening stop, preventing the rotation of the butterfly beyond the vertical position corresponding to the maximum flow (Figure 6). Grooves 32 can be made in the cover to allow passage at the ends of the screws 16.

Dans sa partie proche de l'axe, la périphérie de la deuxième aile est généralement dessinée de façon à éviter ou réduire les fuites d'air le long de l'arbre 12. La partie de la deuxième aile plus éloignée de l'axe 24 présente une forme en plan choisie suivant les caractéristiques de variation de débit recherchées. Pour obtenir une variation particulièrement lente, on peut donner à la deuxième aile une forme de bande s'étendant sur toute la largeur du conduit, comme indiqué en tirets sur la figure 3. Dans le cas contraire, la partie éloignée de l'axe de la deuxième aile 30 peut se limiter à une languette 34 (en traits mixtes sur la figure 3).In its part close to the axis, the periphery of the second wing is generally designed so as to avoid or reduce air leaks along the shaft 12. The part of the second wing more distant from the axis 24 has a plan shape chosen according to the desired variation in flow characteristics. To obtain a particularly slow variation, the second wing can be given a strip shape extending over the entire width of the duct, as indicated in dashes in FIG. 3. In the case on the contrary, the part remote from the axis of the second wing 30 can be limited to a tongue 34 (in phantom in Figure 3).

Le fonctionnement du dispositif qui vient d'être décrit est le suivant.The operation of the device which has just been described is as follows.

Lorsqu'on entrouvre le papillon 14 à partir de la position d'ouverture minimum montrée en figure 2, l'air ne commence à passer qu'entre la tranche du papillon 14 qui s'ouvre vers l'aval et la paroi du conduit. En effet, comme le montre la figure 4, l'opercule continue à obturer sensiblement la moitié de la section de passage offerte par le conduit.When the butterfly valve 14 is ajar from the minimum open position shown in FIG. 2, the air only begins to pass between the edge of the butterfly valve which opens downstream and the wall of the duct. Indeed, as shown in Figure 4, the seal continues to close substantially half of the passage section offered by the conduit.

Il n'y a pas non plus de passage le long de l'arbre 12, du fait que la partie centrale de l'opercule 22 est en contact avec l'arbre lui-même.There is also no passage along the shaft 12, because the central part of the cover 22 is in contact with the shaft itself.

Lorsque le degré d'ouverture du papillon 14 dépasse celui montré en figure 4, l'aile du papillon qui s'ouvre vers l'aval repousse la deuxième aile de l'opercule et entraîne ce dernier, en provoquant une ouverture progressive.When the degree of opening of the butterfly 14 exceeds that shown in FIG. 4, the wing of the butterfly which opens downstream pushes the second wing of the cover and drives the latter, causing a progressive opening.

Enfin, lorsque le papillon atteint sa position de pleine ouverture (figure 6) l'opercule prend lui-même une position dans laquelle il crée une perte de charge minimale, étant appliqué contre le papillon.Finally, when the butterfly reaches its fully open position (Figure 6) the cover itself takes a position in which it creates a minimum pressure drop, being applied against the butterfly.

Lorsque le papillon se referme, il repousse l'opercule. Cette fermeture forcée est un facteur de sécurité.When the butterfly closes, it pushes the cover back. This forced closure is a safety factor.

L'invention est susceptible de nombreuses variantes. Par exemple le boîtier peut porter une butée destinée à limiter la rotation de l'opercule vers sa position de fermeture et à éviter un coincement. La disposition relative du papillon et de l'opercule dans le sens de l'écoulement peut être inversé.The invention is susceptible of numerous variants. For example, the housing can carry a stop intended to limit the rotation of the cover towards its closed position and to avoid jamming. The relative arrangement of the butterfly and the lid in the direction of flow can be reversed.

Claims (10)

  1. A throttle valve body for a fuel feed device for an internal combustion engine, said body comprising a casing formed with an intake conduit (10) containing a throttle valve (14) in the form of a substantially circular disc mounted on a central shaft (12) rotatable about an axis extending transversely to the conduit (10), said throttle valve being movable between a minimum and possibly zero open position and a maximum open position in which the throttle valve (14) extends substantially parallel to the axis of the conduit (10), and also comprising a valve member (22) disposed in the intake conduit (10) and mounted for rotation about an axis (24) parallel to the axis of rotation of the throttle valve (14) and offset from said axis, the valve member (22) being asymmetrical with respect to its axis (24), on one side of which it has a first flange (28) adapted to close a fraction of the section of the intake conduit (10) when the position of the throttle valve (14) with respect to its minimum open position (α O) forms an angle less than a specific angle (α 1), the valve member (22) being connected to the throttle valve (14) by a mechanical link to cause progressive forced opening of the valve member (22) when the movement of the throttle valve (14) from its minimum open position (α O) exceeds said specific angle (α 1), characterised in that the valve member (22) is such that the air flowing through the intake conduit (10) tends to bring its first flange (28) into its position in which it closes the said fraction of the section of the conduit (10) and in that on the other side of its axis (24) it has, contained in the casing, a second flange (30) which constitutes a cam of a shape such that the throttle valve (14) bears thereon when its movement exceeds the said specific angle (α 1).
  2. A throttle valve body according to claim 1, characterised in that the valve member (22) is mounted with an easy fit on a rod (26) fixed across the conduit (10).
  3. A throttle valve body according to claim 1 or 2, characterised in that the axes of rotation of the throttle valve (14) and of the valve member (22) have a relative position such that the throttle valve (14) bears against the first flange (28) of the valve member (22) to drive it towards its closed position on closure of the throttle valve (14).
  4. A throttle valve body according to any one of the preceding claims, characterised in that the axis of rotation (24) of the valve member (22) is offset downstream and on the side of the flange (28) of the throttle member (14) which moves upstream on opening.
  5. A throttle valve body according to any one of the preceding claims, characterised in that the valve member (22) is made of a plastic having a low coefficient of friction.
  6. A throttle valve body according to any one of the preceding claims, characterised in that the throttle valve (14) in its minimum open position forms an angle (α O) with a plane at right angles to the axis of the intake conduit (10), said angle (α O) being sufficient to obviate any jamming.
  7. A throttle valve body according to any one of the preceding claims, characterised in that the second flange (30) of the valve member (22) has a periphery which closes the intake conduit (10) in a part of the cross-section contained between the axis of rotation (12) of the throttle valve (14) and the axis of rotation (24) of the valve member (22) at least.
  8. A throttle valve body according to any one of the preceding claims, characterised in that the valve member (22) has a shape such that it forms a stop which limits the opening movement of the throttle valve (14) in its fully open position.
  9. A throttle valve body according to any one of the preceding claims, characterised in that it comprises a spring returning the valve member (22) to its closed position.
  10. A throttle valve body according to any one of the preceding claims, characterised in that the conduit (10) has a convergent shape (20) from the position occupied by the downstream section of the throttle valve (14) in the minimum open position (α O) of the latter.
EP19920401514 1991-06-05 1992-06-03 Throttle valve body for a fuel admission device for an engine Expired - Lifetime EP0517584B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9106801 1991-06-05
FR9106801A FR2677406B1 (en) 1991-06-05 1991-06-05 BUTTERFLY BODY FOR ENGINE FUEL SUPPLY DEVICE.

Publications (2)

Publication Number Publication Date
EP0517584A1 EP0517584A1 (en) 1992-12-09
EP0517584B1 true EP0517584B1 (en) 1995-01-04

Family

ID=9413496

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920401514 Expired - Lifetime EP0517584B1 (en) 1991-06-05 1992-06-03 Throttle valve body for a fuel admission device for an engine

Country Status (4)

Country Link
EP (1) EP0517584B1 (en)
DE (1) DE69201109T2 (en)
ES (1) ES2067307T3 (en)
FR (1) FR2677406B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10314074A1 (en) * 2003-03-28 2004-10-14 Bayerische Motoren Werke Ag Device for actuating at least one choke flap has drive device coupling actuating device to pulley that enables rotation of pulley in accordance with a transfer function when throttle grip turned

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58202338A (en) * 1982-05-19 1983-11-25 Honda Motor Co Ltd Throttle valve device for carburetor
FR2575518B1 (en) * 1984-12-28 1989-04-07 Inst Francais Du Petrole HOUSING AND BUTTERFLY ASSEMBLY OF A GAS FLOW CONTROL DEVICE
US4905647A (en) * 1988-06-20 1990-03-06 Chrysler Motors Corporation Throttle body

Also Published As

Publication number Publication date
FR2677406B1 (en) 1993-10-08
DE69201109D1 (en) 1995-02-16
EP0517584A1 (en) 1992-12-09
ES2067307T3 (en) 1995-03-16
FR2677406A1 (en) 1992-12-11
DE69201109T2 (en) 1995-06-14

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