EP0507652A1 - Method of manufacturing a butterfly valve in a fuel supplying installation - Google Patents
Method of manufacturing a butterfly valve in a fuel supplying installation Download PDFInfo
- Publication number
- EP0507652A1 EP0507652A1 EP92400807A EP92400807A EP0507652A1 EP 0507652 A1 EP0507652 A1 EP 0507652A1 EP 92400807 A EP92400807 A EP 92400807A EP 92400807 A EP92400807 A EP 92400807A EP 0507652 A1 EP0507652 A1 EP 0507652A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- butterfly
- zones
- cut
- thinned
- thickness
- 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.)
- Granted
Links
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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
- F02D9/107—Manufacturing or mounting details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/06—Making more than one part out of the same blank; Scrapless working
Definitions
- the present invention relates to a method of manufacturing a throttle valve intended to be fixed to a rotary shaft passing through a passage so as to control an air flow in the passage. It finds a particularly important application in supply installations for an internal combustion engine having a carburetor or a body comprising a throttle which is used to regulate the air flow admitted to the engine.
- the shaft allows the butterfly to rotate between a fully open position, where it is oriented parallel to the axis of the passage, and a closed position, where it is applied against the wall of the passage and where, in general, it makes an angle of a few degrees with the plane perpendicular to the axis of the passage.
- butterfly is mounted in a slot crossing the rotary shaft: in this case the axis of rotation of the butterfly is merged with a diameter of the butterfly and a diameter of the conduit.
- the butterfly can then be manufactured in a simple way, because its shape is that of a slice cut obliquely in a straight cylinder. It then suffices to cut out butterfly blanks with a press, to stack them while maintaining them in the appropriate orientation using a spindle and shims, and to machine the cylinder thus formed.
- Butterflies are also used fixed, for example by screws, on a flat machined on the rotary shaft.
- a flat machined on the rotary shaft When the diameter of the rotary shaft is large, one can practice a flattened depth such that the plane of the butterfly practically contains the axis of rotation.
- the rotary shaft When the passage is of small section, the rotary shaft has a diameter too small for it to be possible to machine a deep flat.
- the throttle is offset from the axis of rotation: this situation is encountered in particular in many single-point injection supply systems for internal combustion engines.
- FIG. 1 shows very schematically, by way of example, a throttle body 10 having a housing 12 in which is formed a passage 14 of cylindrical shape.
- the housing is traversed by a rotary shaft 16, controlled by the driver.
- a flat 17 against which the butterfly 20 is applied On this rotary shaft is formed a flat 17 against which the butterfly 20 is applied.
- the flat being shallow, the butterfly is largely offset from the axis of rotation.
- FIG. 1 shows such indentations 22 which constitute in the butterfly thinned peripheral zones limited by a step in the form of an arc of a circle.
- the present invention aims to provide a method of manufacturing a butterfly of the kind defined above avoiding the need for an additional machining operation performed individually on each butterfly.
- the invention notably proposes a manufacturing method according to which, before machining a stack of butterflies to give them an edge in the form of an oblique slice of a straight cylinder, a metal strip is passed through successive work stations of forming which: notches are cut corresponding to zones of the periphery to be thinned on butterflies; said perimeter zones are stamped to reduce their thickness; the outer shape of the butterfly is cut through the thinning and through the strip having retained its original thickness.
- throttle butterflies having peripheral zones thinned by the formation of a circumferential step on at least one face (the operation can however be carried out on both sides, for example for applications where the cross section of the passage varies along its axis).
- the butterfly 20 shown in FIGS. 2 and 3 has a disc shape comprising two thinned zones 22, having for example 0.5 mm thickness when the thickness of the rest of the butterfly is 1.5 mm and the angle of the butterfly with the cross section, in the closed position, is approximately 5 °.
- In the butterfly are pierced two holes 24 for receiving fixing screws on the rotary shaft.
- Two notches 26 are provided in the butterfly shown in Figures 2 and 3, to allow the mounting of sealing elements not shown.
- the thinned zones 22 can be provided over an entire half of the butterfly, except for a central angle a of approximately 40 °.
- a locating hole 34 is drilled in the zone which will subsequently correspond to the central part of the butterfly, in order to allow locating once the zones which contain the holes 28 have been eliminated.
- stage IV the periphery of the butterfly in its indented part is formed.
- stage V the other half is formed, which eliminates the zones containing the locating holes 28.
- step VI the two holes 24 for the passage of the screws are formed by the press.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Lift Valve (AREA)
- Punching Or Piercing (AREA)
Abstract
Description
La présente invention concerne un procédé de fabrication de papillon d'étranglement destiné à être fixé sur un arbre rotatif traversant un passage de façon à commander un débit d'air dans le passage. Elle trouve une application particulièrement importante dans les installations d'alimentation pour moteur à combustion interne ayant un carburateur ou un corps comportant un papillon qui sert à régler le débit d'air admis au moteur.The present invention relates to a method of manufacturing a throttle valve intended to be fixed to a rotary shaft passing through a passage so as to control an air flow in the passage. It finds a particularly important application in supply installations for an internal combustion engine having a carburetor or a body comprising a throttle which is used to regulate the air flow admitted to the engine.
L'arbre permet de faire tourner le papillon entre une position de pleine ouverture, où il est orienté parallèlement à l'axe du passage, et une position de fermeture, où il s'applique contre la paroi du passage et où, en général, il fait un angle de quelques degrés avec le plan perpendiculaire à l'axe du passage.The shaft allows the butterfly to rotate between a fully open position, where it is oriented parallel to the axis of the passage, and a closed position, where it is applied against the wall of the passage and where, in general, it makes an angle of a few degrees with the plane perpendicular to the axis of the passage.
A l'heure actuelle, beaucoup de papillons sont montés dans une fente traversant l'arbre rotatif : dans ce cas l'axe de rotation du papillon est confondu avec un diamètre du papillon et un diamètre du conduit. Le papillon peut alors être fabriqué de façon simple, car sa forme est celle d'une tranche découpée obliquement dans un cylindre droit. Il suffit alors de découper des ébauches de papillon à la presse, de les empiler en les maintenant à l'orientation convenable à l'aide d'une broche et de cales terminales, et d'usiner le cylindre ainsi constitué.At present, many butterflies are mounted in a slot crossing the rotary shaft: in this case the axis of rotation of the butterfly is merged with a diameter of the butterfly and a diameter of the conduit. The butterfly can then be manufactured in a simple way, because its shape is that of a slice cut obliquely in a straight cylinder. It then suffices to cut out butterfly blanks with a press, to stack them while maintaining them in the appropriate orientation using a spindle and shims, and to machine the cylinder thus formed.
On utilise également des papillons fixés, par exemple par des vis, sur un méplat usiné sur l'arbre rotatif. Lorsque le diamètre de l'arbre rotatif est important, on peut y pratiquer un méplat de profondeur telle que le plan du papillon contienne pratiquement l'axe de rotation.Butterflies are also used fixed, for example by screws, on a flat machined on the rotary shaft. When the diameter of the rotary shaft is large, one can practice a flattened depth such that the plane of the butterfly practically contains the axis of rotation.
Lorsque le passage est de faible section, l'arbre rotatif a un diamètre trop petit pour qu'il soit possible d'y usiner un méplat profond. Dans ce cas le papillon est décalé par rapport à l'axe de rotation : cette situation se rencontre notamment dans beaucoup d'installations d'alimentation à injection monopoint pour moteur à combustion interne.When the passage is of small section, the rotary shaft has a diameter too small for it to be possible to machine a deep flat. In this case, the throttle is offset from the axis of rotation: this situation is encountered in particular in many single-point injection supply systems for internal combustion engines.
Il est alors nécessaire de donner au papillon une forme plus complexe que dans les cas précédents. La figure 1 montre très schématiquement, à titre d'exemple, un corps de papillon 10 ayant un boîtier 12 dans lequel est ménagé un passage 14 de forme cylindrique. Le boîtier est traversé par un arbre rotatif 16, commandé par le conducteur. Sur cet arbre rotatif est ménagé un méplat 17 contre lequel vient s'appliquer le papillon 20. Le méplat étant peu profond, le papillon est largement décalé de l'axe de rotation.It is then necessary to give the butterfly a more complex shape than in the previous cases. Figure 1 shows very schematically, by way of example, a
On supposera dans ce qui suit que le sens de circulation de l'air dans le passage 14 est celui indiqué par la flèche fO. Lorsque le papillon est en position de fermeture, il se trouve en conséquence en amont de l'arbre 16. Il fait à ce moment-là un angle de quelques degrés avec la section droite du passage 14.In the following, it will be assumed that the direction of air circulation in the
Pour que tout à la fois le papillon 20 s'applique bien contre la paroi du passage 14 en position de fermeture et ne se coince pas au début de son mouvement d'ouverture, il doit être échancré côté amont, sur une fraction au moins de la périphérie de la moitié qui tourne dans un sens qui augmente l'angle entre le papillon et la section droite du passage. La figure 1 montre de telles échancrures 22 qui constituent dans le papillon des zones périphériques amincies limitées par un redan en forme d'arc de cercle.So that at the same time the
Jusqu'à présent, ces amincissements ont été réalisés par usinage à la fraise individuelle de chaque papillon, ce qui augmente considérablement le prix de revient.Up to now, these thinning operations have been carried out by machining with the individual milling cutter of each butterfly, which considerably increases the cost price.
La présente invention vise à fournir un procédé de fabrication de papillon du genre ci-dessus défini évitant la nécessité d'une opération d'usinage supplémentaire effectuée individuellement sur chaque papillon.The present invention aims to provide a method of manufacturing a butterfly of the kind defined above avoiding the need for an additional machining operation performed individually on each butterfly.
Dans ce but l'invention propose notamment un procédé de fabrication suivant lequel, avant usinage d'un empilement de papillons pour leur donner un bord en forme de tranche oblique de cylindre droit, on fait passer une bande métallique à des postes de travail successifs de formage auxquels : on découpe des échancrures correspondant à des zones du pourtour à amincir sur des papillons ; on estampe lesdites zones de pourtour pour réduire leur épaisseur ; on découpe la forme extérieure du papillon à travers les amincissements et à travers la bande ayant conservé son épaisseur d'origine.To this end, the invention notably proposes a manufacturing method according to which, before machining a stack of butterflies to give them an edge in the form of an oblique slice of a straight cylinder, a metal strip is passed through successive work stations of forming which: notches are cut corresponding to zones of the periphery to be thinned on butterflies; said perimeter zones are stamped to reduce their thickness; the outer shape of the butterfly is cut through the thinning and through the strip having retained its original thickness.
On peut ainsi constituer des papillons d'étranglement ayant des zones périphériques amincies par formation d'un redan circonférentiel sur une face au moins (l'opération pouvant cependant être effectuée sur les deux faces, par exemple pour des applications où la section du passage varie le long de son axe).It is thus possible to constitute throttle butterflies having peripheral zones thinned by the formation of a circumferential step on at least one face (the operation can however be carried out on both sides, for example for applications where the cross section of the passage varies along its axis).
L'invention sera mieux comprise à la lecture de la description qui suit d'un procédé qui en constitue 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 schématiquement un corps de papillon, en coupe suivant un plan passant par l'axe du passage et perpendiculaire à l'axe de rotation du papillon qu'il contient ;
- la figure 2 est une vue en plan d'un papillon utilisable dans le corps montré en figure 1 ;
- la figure 3 est une vue du papillon depuis le bas de la figure 2 ;
- la figure 4 montre des étapes successives de fabrication lors de la mise en oeuvre du procédé.
- Figure 1, already mentioned, schematically shows a butterfly body, in section along a plane passing through the axis of the passage and perpendicular to the axis of rotation of the butterfly it contains;
- Figure 2 is a plan view of a butterfly usable in the body shown in Figure 1;
- Figure 3 is a view of the butterfly from the bottom of Figure 2;
- FIG. 4 shows successive manufacturing steps during the implementation of the method.
Le papillon 20 montré en figures 2 et 3 présente une forme de disque comportant deux zones amincies 22, ayant par exemple 0,5 mm d'épaisseur lorsque l'épaisseur du reste du papillon est de 1,5 mm et que l'angle du papillon avec la section droite, en position de fermeture, est de 5° environ. Dans le papillon sont percés deux trous 24 de réception de vis de fixation sur l'arbre rotatif. Deux encoches 26 sont prévues dans le papillon montré sur les figures 2 et 3, pour permettre le montage d'éléments d'étanchéité non représentés. Les zones amincies 22 peuvent être ménagées sur toute une moitié du papillon, exception faite d'un angle central a de 40° environ.The
Sur la figure 4, on voit qu'au cours d'une première étape I on découpe dans une tôle par exemple en laiton, à l'aide d'un poinçon agissant dans le sens de la flèche f1, d'une part une paire de trous de repérage 28 et d'autre part deux échancrures en arc de cercle 30 dont le bord interne correspond à peu près à une fraction du pourtour final du papillon. A un second poste II, on réduit à la presse (agissant toujours dans le sens de la flèche f1) l'épaisseur de la tôle sur le bord interne, pour l'amener à l'épaisseur finale requise pour constituer les zones amincies 22. Cette opération fait fluer le métal (laiton par exemple) vers l'extérieur : ce fluage est autorisé du fait de la largeur des échancrures 30.In Figure 4, we see that during a first step I is cut from a sheet for example of brass, using a punch acting in the direction of the arrow f1, on the one hand a
Au poste III un trou de repérage 34 est percé, dans la zone qui correspondra ultérieurement à la partie centrale du papillon, afin de permettre le repérage une fois les zones qui contiennent les trous 28 éliminées.At station III, a locating
Au cours de l'étape IV, le pourtour du papillon dans sa partie échancrée est formé. Au cours de l'étape V, l'autre moitié est formée, ce qui élimine les zones contenant les trous de repérage 28.During stage IV, the periphery of the butterfly in its indented part is formed. During stage V, the other half is formed, which eliminates the zones containing the locating
Enfin, au cours de l'étape VI, les deux trous 24 de passage des vis sont formés à la presse.Finally, during step VI, the two
Toutes les opérations ci-dessus, ainsi que la séparation des papillons par découpe à la presse peuvent s'effectuer sur un même outil à suivre. Les papillons mis en forme s'empilent à la sortie et peuvent être immédiatement repris par série de plusieurs dizaines pour être enfilés sur des tringles, maintenus en place par des cales et reportés sur un tour effectuant un usinage global.All the above operations, as well as the separation of the butterflies by cutting with the press can be carried out on the same tool to be followed. Butterflies set form are stacked at the exit and can be immediately taken up in series of several tens to be threaded on rods, held in place by wedges and transferred to a lathe performing global machining.
On voit que le coût de fabrication des papillons est très notablement diminué, du fait qu'on supprime les reprises unitaires pour usinage qui étaient auparavant nécessaires.It can be seen that the cost of manufacturing the butterflies is very considerably reduced, owing to the fact that the unit rework for machining which was previously necessary is eliminated.
Claims (4)
caractérisé en ce que, avant usinage pour donner aux papillons un bord en forme de tranche oblique de cylindre droit, on fabrique des ébauches de papillon en faisant passer une bande métallique à des postes de travail successifs de formage auxquels : on découpe des échancrures (30) correspondant à des zones périphériques à amincir ; on estampe lesdites zones périphériques pour réduire leur épaisseur ; et on découpe la forme extérieure du papillon à travers les zones d'épaisseur réduite et à travers la bande ayant conservé son épaisseur d'origine.Method for manufacturing a throttle valve comprising thinned peripheral zones by forming a circumferential step on at least one face,
characterized in that, before machining to give the butterflies an edge in the form of an oblique slice of a straight cylinder, butterfly blanks are made by passing a metal strip through successive forming work stations to which: cut notches (30 ) corresponding to peripheral areas to be thinned; said peripheral zones are stamped to reduce their thickness; and the outer shape of the butterfly is cut through the zones of reduced thickness and through the strip having retained its original thickness.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9103716 | 1991-03-27 | ||
FR9103716A FR2674600B1 (en) | 1991-03-27 | 1991-03-27 | METHOD FOR MANUFACTURING THREADED BUTTERFLY FOR USE IN A FUEL SUPPLY SYSTEM. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0507652A1 true EP0507652A1 (en) | 1992-10-07 |
EP0507652B1 EP0507652B1 (en) | 1995-04-26 |
Family
ID=9411190
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19920400807 Expired - Lifetime EP0507652B1 (en) | 1991-03-27 | 1992-03-25 | Method of manufacturing a butterfly valve in a fuel supplying installation |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0507652B1 (en) |
DE (1) | DE69202190D1 (en) |
FR (1) | FR2674600B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2729729A1 (en) * | 1995-01-20 | 1996-07-26 | Magneti Marelli France | Elliptical shaped constricting device e.g. for butterfly valves such as in engine carburettor |
EP1302641A3 (en) * | 2001-10-12 | 2004-06-30 | Pierburg GmbH | Throttle valve arrangement for internal combustion engines |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2105343A (en) * | 1936-09-16 | 1938-01-11 | Briggs & Stratton Corp | Butterfly valve |
US3566660A (en) * | 1968-02-28 | 1971-03-02 | Burroughs Corp | Manufacturing method to produce printing type |
DE2716568A1 (en) * | 1976-10-16 | 1978-04-20 | Kubota Ltd | FLAP VALVE |
GB2067719A (en) * | 1979-12-29 | 1981-07-30 | Nissan Motor | A throttle mechanism |
-
1991
- 1991-03-27 FR FR9103716A patent/FR2674600B1/en not_active Expired - Fee Related
-
1992
- 1992-03-25 EP EP19920400807 patent/EP0507652B1/en not_active Expired - Lifetime
- 1992-03-25 DE DE69202190T patent/DE69202190D1/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2105343A (en) * | 1936-09-16 | 1938-01-11 | Briggs & Stratton Corp | Butterfly valve |
US3566660A (en) * | 1968-02-28 | 1971-03-02 | Burroughs Corp | Manufacturing method to produce printing type |
DE2716568A1 (en) * | 1976-10-16 | 1978-04-20 | Kubota Ltd | FLAP VALVE |
GB2067719A (en) * | 1979-12-29 | 1981-07-30 | Nissan Motor | A throttle mechanism |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2729729A1 (en) * | 1995-01-20 | 1996-07-26 | Magneti Marelli France | Elliptical shaped constricting device e.g. for butterfly valves such as in engine carburettor |
EP1302641A3 (en) * | 2001-10-12 | 2004-06-30 | Pierburg GmbH | Throttle valve arrangement for internal combustion engines |
Also Published As
Publication number | Publication date |
---|---|
FR2674600A1 (en) | 1992-10-02 |
DE69202190D1 (en) | 1995-06-01 |
FR2674600B1 (en) | 1993-07-09 |
EP0507652B1 (en) | 1995-04-26 |
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