EP1228299B1 - Butterfly valve body comprising a throttle valve provided with a counterbore - Google Patents

Butterfly valve body comprising a throttle valve provided with a counterbore Download PDF

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Publication number
EP1228299B1
EP1228299B1 EP00974657A EP00974657A EP1228299B1 EP 1228299 B1 EP1228299 B1 EP 1228299B1 EP 00974657 A EP00974657 A EP 00974657A EP 00974657 A EP00974657 A EP 00974657A EP 1228299 B1 EP1228299 B1 EP 1228299B1
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EP
European Patent Office
Prior art keywords
face
butterfly
downstream
relief
throttle body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP00974657A
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German (de)
French (fr)
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EP1228299A1 (en
Inventor
Michael Pontoppidan
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Marelli France SAS
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Magneti Marelli France SAS
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Publication of EP1228299A1 publication Critical patent/EP1228299A1/en
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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
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • 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
    • F02D9/101—Special flap shapes, ribs, bores or the like
    • F02D9/1015—Details of the edge of the flap, e.g. for lowering flow noise or improving flow sealing in closed flap position
    • 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
    • F02D9/107—Manufacturing or mounting details

Definitions

  • the present invention relates to a throttle body for a device fuel injection system for an internal combustion engine.
  • Gas thrown by the throttle has a passing velocity gradient by a maximum on a certain portion of the upper wing of the butterfly. This can hiss at certain opening angles of the throttle when the gas flow is suddenly deflected downstream of the throttle, for example by a wall intake manifold positioned in the immediate vicinity of the exit of the housing and this, whatever the forms of known butterflies.
  • the present invention aims to provide a throttle body in which this kind of hissing is suppressed whatever the angle of opening of the butterfly.
  • a throttle body of the type in question is essentially characterized in that a recessed relief is formed in the face downstream of the portion of the high wing of the butterfly that suffers the maximum speed of gas, the recessed relief opening radially in the peripheral lateral face of the butterfly and being delimited by surfaces whose intersections with the face downstream are sharp edges.
  • the recessed relief causes a dissipation of a part of the energy of the flow of gas flowing on the butterfly so that the energy available to produce an audible noise is largely diminished and therefore whistling is suppressed regardless of the angle opening of this butterfly.
  • FIG. 1 represents a throttle body 1 which comprises a housing 2 in which is provided an intake duct 3, of longitudinal axis X-X.
  • the housing 2 is for example manufactured by molding in a synthetic material such a thermoplastic material and obtained in its final form without machining or complementary deburring. This case can still be made of aluminum.
  • a pivot 5, of axis Y-Y perpendicular to the axis X-X longitudinal duct 3 and intersecting this axis X-X, is rotatably mounted and constitutes a median axis of rotation for a butterfly 6 in the form of a flat disk, sectional (perpendicular to the disk axis) approximately circular or weakly elliptical, with an upper face and a lower face that are substantially flat and substantially parallel to one another, and whose intersections with a peripheral side face connecting them to each other are sharp edges.
  • the median axis of rotation 5 is rotatably mounted for example at mid-height of the duct 3 and divides this duct into two sections 8 and 9.
  • the duct 3 being crossed by a flow of gas in the direction of the arrow F for example, the section 8 is conventionally called upstream section and the section 9 is called downstream section.
  • the butterfly 6 represented in FIGS. 1 to 3 is advantageously made of a synthetic material such as a thermoplastic material. It is consisting of a flat disk of a substantially circular plan or weakly elliptical, of generally constant thickness so that it has a slice 11 of substantially constant height over the entire periphery of the disc. In because of technological constraints and the pressure exerted by the gas on the 6, the thickness of the latter is for example substantially equal to 3 mm less.
  • the butterfly 6 pivots around its median axis of rotation 5 according to the direction of the double arrow R shown in Figure 1, between a position minimum opening and maximum opening position.
  • the butterfly 6 is shown in the intermediate open position.
  • This butterfly can thus be considered as consisting of two half-discs 12 and 13, the half-disc 12 turning to the upstream portion 8 of the conduit 3 being called high wing and the half-disc 13 rotating towards the downstream part 9 of this duct being called wing low.
  • the upper wing 12 has a so-called upstream face 15 facing towards the incoming flow, and an opposite face 16 called downstream which is turned towards the flow outgoing.
  • the distribution of the gas velocity gradient in the duct 3 implies that a portion 20 of the trailing edge of the upper wing 12 undergoes a speed of maximum gas. In this portion, the energy of the flux is therefore very important.
  • a single recessed relief 21 is formed in the downstream face 16 of the high wing 12. This relief 21 opens out in the downstream face 16 and in the peripheral lateral face of the butterfly 6, extending over a portion of the thickness of this butterfly.
  • the embossed relief 21 is in the form of a counterbore substantially of rectangular shape and extending substantially radially. Its axis of symmetry Z-Z coincides for example with the diameter of the butterfly and is perpendicular to the Y-Y axis. Indeed, when no obstacle is located in upstream of the throttle valve 6 in the duct 3, the plane of maximum speeds of the gas passes through the diameter of the butterfly 6 which is perpendicular to the axis of rotation Y-Y. However, in the case where the duct 3 has an obstacle upstream of this butterfly 6, the maximum speed plan goes through a different place so that the recessed relief 21 is then located in a different region of the downstream face 16 of the upper wing 12 of the butterfly 6. An essential characteristic is that this relief 21 is always located at the maximum speed plane.
  • the depth of the recessed relief 21 is such that the remaining thickness e of the butterfly 6 in the region 20 is less than 1.5 mm.
  • the recessed relief 21 is delimited by an upper face 24, substantially flat and substantially parallel to the downstream face 16, and from which extend, up to the downstream face 16, two substantially radial faces 25, 17 visually and vis-à-vis and a transverse face 27 which are also substantially flat, this face 27 connecting the radial faces 25 and 26 one to the other and being substantially parallel to the axis of rotation Y-Y.
  • the width l of the recessed relief 21, considered in the direction substantially circumferential, that is to say its dimension along the transverse face 27, is substantially between 10% and 25% of the value of the diameter of the butterfly 6.
  • the width I is approximately equal to 6 mm and the length L is approximately equal to 5 mm while the depth of this relief 21 is substantially constant and approximately equal to 1 mm.
  • the portion 20 of the upper wing 12 is of greatly reduced thickness compared to the thickness of the rest of the butterfly 6, and is in the present case of the order of two third to half the thickness of the rest of the butterfly 6.
  • the presence of the recessed relief 21 as defined above causes a decrease in the energy of the flow of gas flowing on the butterfly 6 so that all hissing, which would typically occur for an angle opening ⁇ throttle 6 between 13 and 21 °, is deleted.
  • the faces 25 and 26 may be substantially parallel to one another, or diverging, to a different extent from the divergence resulting from strictly radial faces, from the transverse face 27 and towards the periphery of the butterfly.
  • the so-called radial faces 25 and 26 are connected to the upper face 24 of the relief 21 according to rounded edges. This promotes even more suppression of hissing.
  • the butterfly 6 is located at a distance equal to at least its diameter, and preferably 1.5 times its diameter, these obstacles.

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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)
  • Fuel-Injection Apparatus (AREA)
  • Complex Calculations (AREA)
  • Specific Sealing Or Ventilating Devices For Doors And Windows (AREA)
  • Bathtub Accessories (AREA)

Abstract

Separated air flow in the neighborhood of the leading edge of a butterfly valve plate in a throttle body fuel injection system can result in whistling. To alleviate the noise, a provided with an recess, or relief, on the suction side of the butterfly valve plate, near the leading edge. The recess has sides that are substantially radial lines starting at the outer periphery of the valve plate and extending toward the center of the valve plate. At their centermost ends, they are connected by a substantially straight line running parallel to the axis of rotation of the butterfly valve plate.

Description

La présente invention est relative à un corps papillon pour dispositif d'injection de combustible pour moteur à combustion interne.The present invention relates to a throttle body for a device fuel injection system for an internal combustion engine.

Plus particulièrement, l'invention concerne un corps papillon du type comportant (voir DE-A-197 147 17):

  • un boítier dans lequel est ménagé un conduit d'admission d'air, et
  • un papillon en forme de disque sensiblement circulaire ou faiblement elliptique, monté sur un axe médian de rotation, transversal au conduit, divisant ce conduit en une partie amont et une partie aval, et déplaçable entre une position d'ouverture minimum et une position d'ouverture maximum pour laquelle le plan du papillon est orienté sensiblement parallèlement à l'axe du conduit d'admission, la partie du papillon qui tourne vers la partie amont du conduit, respectivement vers la partie aval, à partir de la position d'ouverture minimum, étant appelée aile haute, respectivement aile basse, et ayant une forme de demi-disque plat possédant une tranche de faible épaisseur par rapport à sa surface, l'aile haute présentant ainsi une face amont et une face aval, le conduit étant destiné à être traversé par un flux de gaz dont la vitesse est maximale au niveau d'une portion de faite haute du papillon.
More particularly, the invention relates to a throttle body of the type comprising (see DE-A-197 147 17):
  • a housing in which is formed an air intake duct, and
  • a substantially circular or slightly elliptical disk-shaped throttle mounted on a median axis of rotation, transverse to the conduit, dividing said conduit into an upstream portion and a downstream portion, and movable between a minimum open position and a desired position; maximum opening for which the plane of the butterfly is oriented substantially parallel to the axis of the intake duct, the portion of the butterfly which rotates towards the upstream portion of the duct, respectively towards the downstream portion, from the minimum open position , being called high wing, respectively low wing, and having a flat half-disk shape having a thin wafer with respect to its surface, the upper wing thus having an upstream face and a downstream face, the conduit being intended for to be traversed by a flow of gas whose speed is maximum at a portion of made high butterfly.

Le gaz dévié par le papillon possède un gradient de vitesses qui passe par un maximum sur une certaine portion de l'aile haute du papillon. Ceci peut provoquer un sifflement pour certains angles d'ouverture du papillon lorsque le flux de gaz est brutalement dévié en aval du papillon, par exemple par une paroi du collecteur d'admission positionné dans l'immédiate proximité de la sortie du boítier et ce, quelles que soient les formes des papillons connus.Gas thrown by the throttle has a passing velocity gradient by a maximum on a certain portion of the upper wing of the butterfly. This can hiss at certain opening angles of the throttle when the gas flow is suddenly deflected downstream of the throttle, for example by a wall intake manifold positioned in the immediate vicinity of the exit of the housing and this, whatever the forms of known butterflies.

La présente invention a pour but de foumir un corps papillon dans lequel ce genre de sifflement est supprimé quel que soit l'angle d'ouverture du papillon.The present invention aims to provide a throttle body in which this kind of hissing is suppressed whatever the angle of opening of the butterfly.

A cet effet, selon l'invention, un corps papillon du type en question est essentiellement caractérisé en ce qu'un relief en creux est ménagé dans la face aval de la portion de l'aile haute du papillon qui subit le maximum de vitesse du gaz, le relief en creux débouchant radialement dans la face latérale périphérique du papillon et étant délimité par des surfaces dont les intersections avec la face aval sont des arêtes vives.For this purpose, according to the invention, a throttle body of the type in question is essentially characterized in that a recessed relief is formed in the face downstream of the portion of the high wing of the butterfly that suffers the maximum speed of gas, the recessed relief opening radially in the peripheral lateral face of the butterfly and being delimited by surfaces whose intersections with the face downstream are sharp edges.

Ainsi, grâce à ces dispositions, le relief en creux provoque une dissipation d'une partie de l'énergie du flux de gaz qui s'écoule sur le papillon de sorte que l'énergie disponible pour produire un bruit audible est largement diminuée et par conséquent le sifflement est supprimé quel que soit l'angle d'ouverture de ce papillon.Thus, thanks to these arrangements, the recessed relief causes a dissipation of a part of the energy of the flow of gas flowing on the butterfly so that the energy available to produce an audible noise is largely diminished and therefore whistling is suppressed regardless of the angle opening of this butterfly.

Dans des modes de réalisation préférés de la présente invention, on a recours, en outre, à l'une et/ou à l'autre des dispositions suivantes :

  • le relief en creux est délimité par une face supérieure à partir de laquelle s'étendent, jusqu'à la face aval, deux faces sensiblement radiales sensiblement en vis-à-vis, et une face transversale raccordant les faces sensiblement radiales l'une à l'autre, et telles que les intersections des faces sensiblement radiales et transversale avec la face aval sont des arêtes vives,
  • les faces supérieure, sensiblement radiales, et transversale sont sensiblement planes,
  • les intersections de la face transversale avec les faces sensiblement radiales et la face supérieure sont des arêtes vives,
  • les faces sensiblement radiales sont raccordées à la face supérieure selon une forme arrondie,
  • les faces sensiblement radiales divergent l'une de l'autre à partir de la face transversale et vers la face latérale périphérique du papillon,
  • la face supérieure du relief en creux est sensiblement parallèle aux faces aval et amont, dont les intersections avec la face latérale périphérique du papillon sont des arêtes vives,
  • au niveau du relief en creux, l'épaisseur restante du papillon est inférieure à 1,5 mm environ, la largeur du relief en creux, considérée en direction sensiblement circonférentielle, est comprise entre 10 % et 25 % du diamètre du papillon environ, et la longueur du relief en creux, considérée en direction sensiblement radiale, est supérieure à environ 50 % de la largeur dudit relief, et
  • la longueur du relief en creux est inférieure à environ 90 % de la largeur dudit relief.
In preferred embodiments of the present invention, further use is made of one and / or the other of the following:
  • the recessed relief is delimited by an upper face from which extend, to the downstream face, two substantially radial faces substantially facing each other, and a transverse face connecting the substantially radial faces, one to the other, and such that the intersections of the substantially radial faces and transverse with the downstream face are sharp edges,
  • the upper, substantially radial, and transverse faces are substantially flat,
  • the intersections of the transverse face with the substantially radial faces and the upper face are sharp edges,
  • the substantially radial faces are connected to the upper face in a rounded shape,
  • the substantially radial faces diverge from each other from the transverse face and towards the peripheral lateral face of the butterfly,
  • the upper face of the recessed relief is substantially parallel to the downstream and upstream faces, whose intersections with the peripheral lateral face of the butterfly are sharp edges,
  • at the recessed relief, the remaining thickness of the butterfly is less than about 1.5 mm, the width of the recessed relief, considered in substantially circumferential direction, is between 10% and 25% of the diameter of the butterfly, and the length of the recessed relief, considered in a substantially radial direction, is greater than approximately 50% of the width of said relief, and
  • the length of the relief is less than approximately 90% of the width of said relief.

D'autres caractéristiques et avantages de l'invention apparaítront au cours de la description suivante de l'une de ses formes de réalisation, donnée à titre d'exemple non limitatif, en regard des dessins annexés sur lesquels :

  • la figure 1 est une vue en coupe longitudinale d'un corps papillon possédant un papillon selon la présente invention,
  • la figure 2 est une vue de dessous du papillon de la figure 1, et
  • la figure 3 est une vue schématique partielle agrandie, selon la flèche III de la figure 2, du papillon en élévation latérale et face à l'ouverture du relief en creux dans la face latérale périphérique du papillon.
Other features and advantages of the invention will become apparent from the following description of one of its embodiments, given by way of non-limiting example, with reference to the accompanying drawings, in which:
  • FIG. 1 is a view in longitudinal section of a butterfly body having a butterfly according to the present invention,
  • FIG. 2 is a view from below of the butterfly of FIG. 1, and
  • Figure 3 is an enlarged partial schematic view, along the arrow III of Figure 2, the butterfly in side elevation and facing the opening of the recessed relief in the peripheral side face of the butterfly.

La figure 1 représente un corps papillon 1 qui comprend un boítier 2 dans lequel est ménagé un conduit d'admission 3, d'axe longitudinal X-X. Le boítier 2 est par exemple fabriqué par moulage en un matériau de synthèse tel qu'un matériau thermoplastique et obtenu à sa forme définitive sans usinage ni ébavurage complémentaires. Ce boítier peut encore être réalisé en aluminium.FIG. 1 represents a throttle body 1 which comprises a housing 2 in which is provided an intake duct 3, of longitudinal axis X-X. The housing 2 is for example manufactured by molding in a synthetic material such a thermoplastic material and obtained in its final form without machining or complementary deburring. This case can still be made of aluminum.

Dans le boítier 2, un pivot 5, d'axe Y-Y perpendiculaire à l'axe longitudinal X-X du conduit 3 et coupant cet axe X-X, est monté rotatif et constitue un axe médian de rotation pour un papillon 6 en forme de disque plat, de section (perpendiculairement à l'axe du disque) approximativement circulaire ou faiblement elliptique, avec une face supérieure et une face inférieure qui sont sensiblement planes et sensiblement parallèles l'une à l'autre, et dont les intersections avec une face latérale périphérique les raccordant l'une à l'autre sont des arêtes vives.In the housing 2, a pivot 5, of axis Y-Y perpendicular to the axis X-X longitudinal duct 3 and intersecting this axis X-X, is rotatably mounted and constitutes a median axis of rotation for a butterfly 6 in the form of a flat disk, sectional (perpendicular to the disk axis) approximately circular or weakly elliptical, with an upper face and a lower face that are substantially flat and substantially parallel to one another, and whose intersections with a peripheral side face connecting them to each other are sharp edges.

L'axe médian de rotation 5 est monté rotatif par exemple à mi-hauteur du conduit 3 et divise ce conduit en deux tronçons 8 et 9. Le conduit 3 étant traversé par un flux de gaz selon le sens de la flèche F par exemple, le tronçon 8 est par convention appelé tronçon amont et le tronçon 9 est appelé tronçon aval.The median axis of rotation 5 is rotatably mounted for example at mid-height of the duct 3 and divides this duct into two sections 8 and 9. The duct 3 being crossed by a flow of gas in the direction of the arrow F for example, the section 8 is conventionally called upstream section and the section 9 is called downstream section.

Le papillon 6 représenté aux figures 1 à 3 est avantageusement réalisé en un matériau de synthèse tel qu'un matériau thermoplastique. Il est constitué d'un disque plat de forme en plan sensiblement circulaire ou faiblement elliptique, d'épaisseur généralement constante de sorte qu'il possède une tranche 11 de hauteur sensiblement constante sur toute la périphérie du disque. En raison de contraintes technologiques et de la pression exercée par le gaz sur le papillon 6, l'épaisseur de celui-ci est par exemple sensiblement égale à 3 mm au moins.The butterfly 6 represented in FIGS. 1 to 3 is advantageously made of a synthetic material such as a thermoplastic material. It is consisting of a flat disk of a substantially circular plan or weakly elliptical, of generally constant thickness so that it has a slice 11 of substantially constant height over the entire periphery of the disc. In because of technological constraints and the pressure exerted by the gas on the 6, the thickness of the latter is for example substantially equal to 3 mm less.

Le papillon 6 pivote autour de son axe médian de rotation 5 selon le sens de la double flèche R représentée sur la figure 1, entre une position d'ouverture minimum et une position d'ouverture maximum. Sur la figure 1, le papillon 6 est représenté en position d'ouverture intermédiaire. Ce papillon peut ainsi être considéré comme constitué de deux demi-disques 12 et 13, le demi-disque 12 tournant vers la partie amont 8 du conduit 3 étant appelé aile haute et le demi-disque 13 tournant vers la partie aval 9 de ce conduit étant appelé aile basse. L'aile haute 12 possède une face 15 dite amont tournée en direction du flux entrant, et une face opposée 16 dite aval qui est tournée en direction du flux sortant.The butterfly 6 pivots around its median axis of rotation 5 according to the direction of the double arrow R shown in Figure 1, between a position minimum opening and maximum opening position. In Figure 1, the butterfly 6 is shown in the intermediate open position. This butterfly can thus be considered as consisting of two half-discs 12 and 13, the half-disc 12 turning to the upstream portion 8 of the conduit 3 being called high wing and the half-disc 13 rotating towards the downstream part 9 of this duct being called wing low. The upper wing 12 has a so-called upstream face 15 facing towards the incoming flow, and an opposite face 16 called downstream which is turned towards the flow outgoing.

La répartition du gradient de vitesses du gaz dans le conduit 3 implique qu'une portion 20 du bord de fuite de l'aile haute 12 subit une vitesse de gaz maximale. Dans cette portion, l'énergie du flux est donc très importante.The distribution of the gas velocity gradient in the duct 3 implies that a portion 20 of the trailing edge of the upper wing 12 undergoes a speed of maximum gas. In this portion, the energy of the flux is therefore very important.

Selon la présente invention, au niveau de cette portion 20, un unique relief en creux 21 est ménagé dans la face aval 16 de l'aile haute 12. Ce relief 21 débouche dans la face aval 16 et dans la face latérale périphérique du papillon 6, en s'étendant sur une partie de l'épaisseur de ce papillon.According to the present invention, at this portion 20, a single recessed relief 21 is formed in the downstream face 16 of the high wing 12. This relief 21 opens out in the downstream face 16 and in the peripheral lateral face of the butterfly 6, extending over a portion of the thickness of this butterfly.

Le relief en creux 21 se présente sous la forme d'un lamage sensiblement de forme rectangulaire et s'étendant sensiblement radialement. Son axe de symétrie Z-Z coïncide par exemple avec le diamètre du papillon et est perpendiculaire à l'axe Y-Y. En effet, lorsque aucun obstacle n'est situé en amont du papillon 6 dans le conduit 3, le plan de vitesses maximales du gaz passe par le diamètre du papillon 6 qui est perpendiculaire à l'axe de rotation Y-Y. Toutefois, dans le cas où le conduit 3 possède un obstacle en amont de ce papillon 6, le plan de vitesses maximales passe par un lieu différent de sorte que le relief en creux 21 est alors situé dans une région différente de la face aval 16 de l'aile haute 12 du papillon 6. Une caractéristique essentielle est que ce relief 21 est toujours situé au niveau du plan de vitesse maximale.The embossed relief 21 is in the form of a counterbore substantially of rectangular shape and extending substantially radially. Its axis of symmetry Z-Z coincides for example with the diameter of the butterfly and is perpendicular to the Y-Y axis. Indeed, when no obstacle is located in upstream of the throttle valve 6 in the duct 3, the plane of maximum speeds of the gas passes through the diameter of the butterfly 6 which is perpendicular to the axis of rotation Y-Y. However, in the case where the duct 3 has an obstacle upstream of this butterfly 6, the maximum speed plan goes through a different place so that the recessed relief 21 is then located in a different region of the downstream face 16 of the upper wing 12 of the butterfly 6. An essential characteristic is that this relief 21 is always located at the maximum speed plane.

Dans le cas présent, la profondeur du relief en creux 21 est telle que l'épaisseur e restante du papillon 6 dans la région 20 est inférieure à 1,5 mm.In this case, the depth of the recessed relief 21 is such that the remaining thickness e of the butterfly 6 in the region 20 is less than 1.5 mm.

Par ailleurs, le relief en creux 21 est délimité par une face supérieure 24, sensiblement plane et sensiblement parallèle à la face aval 16, et à partir de laquelle s'étendent, jusqu'à la face aval 16, deux faces sensiblement radiales 25, 26 sensiblement en vis-à-vis et une face transversale 27 qui sont également sensiblement planes, cette face 27 raccordant les faces radiales 25 et 26 l'une à l'autre et étant sensiblement parallèle à l'axe de rotation Y-Y.Furthermore, the recessed relief 21 is delimited by an upper face 24, substantially flat and substantially parallel to the downstream face 16, and from which extend, up to the downstream face 16, two substantially radial faces 25, 17 visually and vis-à-vis and a transverse face 27 which are also substantially flat, this face 27 connecting the radial faces 25 and 26 one to the other and being substantially parallel to the axis of rotation Y-Y.

Les intersections des faces dites « radiales » 25, 26 et de la face transversale 27 avec la face aval 16 sont toutes des arêtes vives 25a, 26a et 27a. De même, les intersections de la face transversale 27 avec les faces dites radiales 25, 26 et avec la face supérieure 24 peuvent être des arêtes vives 27c, 27d et 27b.Intersections of the so-called "radial" faces 25, 26 and of the face transverse 27 with the downstream face 16 are all sharp edges 25a, 26a and 27a. Similarly, the intersections of the transverse face 27 with the so-called faces radial 25, 26 and with the upper face 24 can be sharp edges 27c, 27d and 27b.

La largeur l du relief en creux 21, considérée en direction sensiblement circonférentielle, c'est-à-dire sa dimension suivant la face transversale 27, est sensiblement comprise entre 10 % et 25 % de la valeur du diamètre du papillon 6. Quant à la longueur L de ce relief 21, considérée en direction sensiblement radiale, c'est-à-dire sa dimension suivant les faces dites radiales 25, 26, elle est comprise entre environ 50 % et 90 % de la largeur l. Typiquement, la largeur I est environ égale à 6 mm et la longueur L est environ égale à 5 mm tandis que la profondeur de ce relief 21 est sensiblement constante et environ égale à 1 mm. La portion 20 de l'aile haute 12 est d'épaisseur fortement réduite par rapport à l'épaisseur du reste du papillon 6, et est dans le cas présent de l'ordre des deux tiers à la moitié de l'épaisseur du reste du papillon 6.The width l of the recessed relief 21, considered in the direction substantially circumferential, that is to say its dimension along the transverse face 27, is substantially between 10% and 25% of the value of the diameter of the butterfly 6. As to the length L of this relief 21, considered in a direction substantially radial, that is to say its dimension along the so-called radial faces 25, 26, it is between about 50% and 90% of the width l. Typically, the width I is approximately equal to 6 mm and the length L is approximately equal to 5 mm while the depth of this relief 21 is substantially constant and approximately equal to 1 mm. The portion 20 of the upper wing 12 is of greatly reduced thickness compared to the thickness of the rest of the butterfly 6, and is in the present case of the order of two third to half the thickness of the rest of the butterfly 6.

Ainsi, la présence du relief en creux 21 tel que défini ci-dessus, provoque une diminution de l'énergie du flux de gaz qui s'écoule sur le papillon 6 de sorte que tout sifflement, qui se produirait typiquement pour un angle d'ouverture α du papillon 6 compris entre 13 et 21°, est supprimé. Thus, the presence of the recessed relief 21 as defined above, causes a decrease in the energy of the flow of gas flowing on the butterfly 6 so that all hissing, which would typically occur for an angle opening α throttle 6 between 13 and 21 °, is deleted.

En variante, les faces 25 et 26 peuvent être sensiblement parallèles l'une à l'autre, ou encore divergentes, dans une mesure différente de la divergence résultant de faces strictement radiales, à partir de la face transversale 27 et vers la périphérie du papillon.Alternatively, the faces 25 and 26 may be substantially parallel to one another, or diverging, to a different extent from the divergence resulting from strictly radial faces, from the transverse face 27 and towards the periphery of the butterfly.

Dans encore une autre variante, les faces dites radiales 25 et 26 sont raccordées à la face supérieure 24 du relief 21 selon des bords arrondis. Ceci favorise encore plus la suppression du sifflement.In yet another variant, the so-called radial faces 25 and 26 are connected to the upper face 24 of the relief 21 according to rounded edges. This promotes even more suppression of hissing.

Parfois, pour des raisons d'encombrement, des obstacles sont situés dans la partie aval 9 du conduit 3. Il est alors préférable que le papillon 6 soit situé à une distance égale à au moins son diamètre, et de préférence à 1,5 fois son diamètre, de ces obstacles.Sometimes, for reasons of space, obstacles are located in the downstream part 9 of the conduit 3. It is then preferable that the butterfly 6 is located at a distance equal to at least its diameter, and preferably 1.5 times its diameter, these obstacles.

Claims (8)

  1. Throttle body for a fuel injection device for an internal combustion engine, comprising:
    a housing (2) in which an air inlet duct (3) is formed, and
    a butterfly (6) in the form of a substantially circular or slightly elliptical disk mounted on a central rotation spindle (5) transversal to the duct (3), splitting this duct into an upstream part (8) and a downstream part (9) and movable between a minimally open position and a wide open position for which the plane of the butterfly is oriented substantially parallel to the axis (X-X) of the inlet duct (3), the part of the butterfly (6) which rotates toward the upstream part (8) of the duct (3) and the part which rotates toward the downstream part (9), from the minimally open position, being known respectively as the upper wing (12) and the lower wing (13) and having the shape of a flat half-disk having an edge face (11) of small thickness with respect to its area, the upper wing (12) thus having an upstream face (15) and a downstream face (16), the duct (3) being intended to have passing through it a stream of gas the velocity of which is at a maximum at a portion (20) of the upper wing (12) of the butterfly (6), a recessed relief (21) being formed in the downstream face (16) of the portion (20) of the upper wing (12) of the butterfly (6) which experiences the maximum gas velocity, the recessed relief (21) opening radially into the peripheral lateral face of the butterfly (6) and being delimited by an upper face (24) from which there extend, as far as the downstream face (16), two substantially radial faces (25, 26) substantially facing each other, of which the intersections with the downstream face (16) are sharp edges (25a, 26a,),
    characterized in that the recessed relief (21) is also delimited by a transverse face (27) connecting the substantially radial faces (25, 26) together and which is such that the intersection of the transverse face (27) with the downstream face (16) is also a sharp edge (27a).
  2. Throttle body according to Claim 1, characterized in that the upper face (24), the substantially radial faces (25, 26) and the transverse face (27) are substantially flat.
  3. Throttle body according to one of Claims 1 and 2, characterized in that the intersections of the transverse face (25) with the substantially radial faces (25, 26) and the upper face (24) are sharp edges (27c, 27d, 27b).
  4. Throttle body according to any one of Claims 1 to 3, characterized in that the substantially radial faces (25, 26) are connected to the upper face (24) with a rounded shape.
  5. Throttle body according to any one of Claims 1 to 4, characterized in that the substantially radial faces (25, 26) diverge from one another from the transverse face (27) and toward the peripheral lateral face of the butterfly (6).
  6. Throttle body according to any one of Claims 1 to 5, characterized in that the upper face (24) of the recessed relief (21) is substantially parallel to the downstream face (16) and the upstream face (15), of which the intersections with the peripheral lateral face of the butterfly (6) are sharp edges.
  7. Throttle body according to any one of Claims 1 to 6, characterized in that, at the recessed relief (21), the remaining thickness e of the butterfly (6) is less than about 1.5 mm, the width I of the recessed relief (21), considered in a substantially circumferential direction, is substantially between 10% and 25% of the diameter of the butterfly (6), and the length L of the recessed relief (21), considered in a substantially radial direction, is greater than about 50% of the width of said recessed relief (6).
  8. Throttle body according to Claim 7, characterized in that the length L of the recessed relief (21) is less than about 90% of the width I of said relief (21).
EP00974657A 1999-11-10 2000-11-06 Butterfly valve body comprising a throttle valve provided with a counterbore Expired - Lifetime EP1228299B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9914128 1999-11-10
FR9914128A FR2800798B1 (en) 1999-11-10 1999-11-10 BUTTERFLY BODY HAVING A BUTTERFLY PROVIDED WITH A BLADE
PCT/FR2000/003079 WO2001034958A1 (en) 1999-11-10 2000-11-06 Butterfly valve body comprising a throttle valve provided with a counterbore

Publications (2)

Publication Number Publication Date
EP1228299A1 EP1228299A1 (en) 2002-08-07
EP1228299B1 true EP1228299B1 (en) 2005-04-06

Family

ID=9551961

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00974657A Expired - Lifetime EP1228299B1 (en) 1999-11-10 2000-11-06 Butterfly valve body comprising a throttle valve provided with a counterbore

Country Status (9)

Country Link
US (1) US6705283B1 (en)
EP (1) EP1228299B1 (en)
AT (1) ATE292750T1 (en)
BR (1) BR0015434B1 (en)
DE (1) DE60019323T2 (en)
ES (1) ES2240195T3 (en)
FR (1) FR2800798B1 (en)
PL (1) PL199337B1 (en)
WO (1) WO2001034958A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018132033A (en) * 2017-02-17 2018-08-23 株式会社ニッキ Fuel supply device of two-cylinder general purpose engine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1344121A (en) * 1963-01-18 1963-11-22 Lockheed Aircraft Corp Noise suppression device for a valve for fluids
US3298677A (en) * 1964-04-20 1967-01-17 Champion Spark Plug Co Throttle valve for internal combustion engines
EP0076612A1 (en) * 1981-09-29 1983-04-13 Merle Robert Showalter Throttle valve
JPS59160048A (en) * 1983-03-04 1984-09-10 Toyota Motor Corp Throttle-valve mechanism for internal-combustion engine
JPH10103087A (en) * 1996-10-01 1998-04-21 Mitsubishi Electric Corp Control valve gear
US5881995A (en) * 1997-12-15 1999-03-16 Pratt & Whitney Canada Inc. Noise attenuating device for butterfly valves
JPH11294199A (en) * 1998-04-06 1999-10-26 Hitachi Ltd Intake air flow control valve

Also Published As

Publication number Publication date
FR2800798B1 (en) 2002-11-15
DE60019323T2 (en) 2006-03-09
WO2001034958A1 (en) 2001-05-17
PL199337B1 (en) 2008-09-30
US6705283B1 (en) 2004-03-16
ATE292750T1 (en) 2005-04-15
BR0015434A (en) 2002-07-02
DE60019323D1 (en) 2005-05-12
EP1228299A1 (en) 2002-08-07
ES2240195T3 (en) 2005-10-16
BR0015434B1 (en) 2010-08-24
PL354535A1 (en) 2004-01-26
FR2800798A1 (en) 2001-05-11

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