WO2010130911A1 - Method for casting the cylinder head of a heat engine - Google Patents

Method for casting the cylinder head of a heat engine Download PDF

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Publication number
WO2010130911A1
WO2010130911A1 PCT/FR2010/050789 FR2010050789W WO2010130911A1 WO 2010130911 A1 WO2010130911 A1 WO 2010130911A1 FR 2010050789 W FR2010050789 W FR 2010050789W WO 2010130911 A1 WO2010130911 A1 WO 2010130911A1
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Prior art keywords
cores
core
cylinder head
housing
casting
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PCT/FR2010/050789
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French (fr)
Inventor
Didier Girard
Antoine Grandhomme
Original Assignee
Peugeot Citroën Automobiles SA
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Publication date
Application filed by Peugeot Citroën Automobiles SA filed Critical Peugeot Citroën Automobiles SA
Priority to EP10727038A priority Critical patent/EP2429739A1/en
Publication of WO2010130911A1 publication Critical patent/WO2010130911A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/103—Multipart cores

Definitions

  • the present invention relates to a method of manufacturing, by metal casting, a cylinder head of a heat engine.
  • the cylinder head of a heat engine is a complex piece, cast iron or aluminum, most often comprising the intake ducts, the exhaust ducts and water chambers in which can circulate a cooling fluid (coolant).
  • the cylinder heads are subjected to high mechanical and thermal stresses. They are therefore carefully cooled by large heat transfer fluid chambers (called water chambers) which must be surrounded as close as possible to the combustion chambers and the exhaust ducts.
  • the circulation of the coolant (hereinafter referred to as "water” for simplicity) must be defined to provide the best possible cooling closer to the combustion chambers.
  • water heat transfer fluid chambers
  • the raw yoke is obtained in a foundry, generally according to the so-called "shell gravity casting” process, by casting metal (cast iron or aluminum) in a mold composed of a metal frame and an assembly of sand cores. The molten metal fills the spaces left free between the metal frame and the various sand cores.
  • Figure 1 shows a portion 10 of the water core, an exhaust core 12 and an intake core 14.
  • the exhaust 12 and intake 14 cores are placed in housing respectively 16 and 18.
  • the cores are sand.
  • the hole 20 is intended to be filled with metal in which a housing for a glow plug (the example described for a diesel engine cylinder head).
  • the complete water core 22 is shown in Figure 4.
  • the core comprises the housing 16 and 18 respectively exhaust ducts 12 and 14 admission.
  • the holes 24 will be, at the time of casting, filled with metal that will be by the subsequently drilled to form injector wells.
  • Holes 26 prefigure the locations for the bolts of bolt.
  • the protuberances 28 are staves of nuclei whose function is to prevent the water core from rising during the casting of the metal in the mold.
  • the heat transfer fluid (for simplicity will be designated later by this fluid by water) arrives in the cylinder head according to the arrow 30, circulates in the cylinder head (and thus in the water core 22) in the direction of the arrow 32 and comes out of the bolt as indicated by the arrow 34.
  • the exhaust cores 12 and 14 are inserted in the housing respectively 16 and 18. These cores are mainly sand and therefore relatively fragile. As indicated above, it is important that the cores 12 and 14 are not deformed, especially that their outer diameter is not decreased, These dishes will be an obstacle to the flow of exhaust gas. This results in a decrease in the air flow.
  • Figures 5 and 6 respectively show a top view of the water core ( Figure 5) and a side view ( Figure 6 - section along A of Figure 5). These Figures 5 and 6 illustrate a case where it was necessary to make a plate 46 on the intake duct 48, and thus to deform, so as to allow sufficient water circulation to obtain a proper cooling of the injector whose location is shown by the hole 50.
  • the metal part of the cylinder head is indicated by the 54.
  • the plate 46 allows sufficient circulation of water through the passage 52, but at the expense of the air flow in the intake duct.
  • the present invention relates to a method which does not have, or attenuated, at least one of the disadvantages of the prior art.
  • the invention relates to a method of manufacturing by casting a heat engine cylinder cooled by a coolant, wherein the cores are placed in a mold, including a water core comprising housing for receive conduit cores.
  • the water core is made in two cores, a lower core and an upper core, said conduit cores being molded into said lower core housings, the upper core then being molded onto the lower core and the conduit cores .
  • conduit cores are remmoulés from top to bottom, substantially vertically, in said housing;
  • each of said lower and upper cores comprises a portion of each of said housing, preferably a half of one of said housing.
  • the separation between the lower and upper cores creates at the time of casting a rib that enhances the mechanical rigidity of the cylinder head.
  • bores are drilled in the lower and upper cores so as to provide passages for the circulation of heat transfer fluid between the lower and upper parts of the cylinder head.
  • the characteristics of said bores are sized so that the passages allow the flow of coolant desired between the lower and upper parts of the cylinder head. Sizing means the number of holes, their distribution and their diameters.
  • the conduits of said conduit cores intended to be placed in said housing are ducts which undergo a high temperature rise, for example the exhaust ducts.
  • FIGS. 1 to 6 illustrate the prior art and its disadvantages
  • FIGS. 7 and 8 illustrate the method according to the invention
  • FIGS. 9 and 10 show an advantage of the invention, namely the possibility of obtaining a rib for reinforcing the cylinder head.
  • the water core 61 consists of a lower water core 60 and an upper water core 62 ( Figure 7), the two lower and upper cores can be imagined as the result of cutting the core.
  • water 22 of Figure 4 in two parts in the longitudinal direction.
  • the lower and upper cores each comprise a portion 64 of the housings 68 for the lower nucleus and a portion 66 for the upper nucleus of the exhaust nuclei 12.
  • the division of the water nucleus into two parts makes it possible to remold (that is to say Precisely assembling, just prior to the casting of metal) easily the conduit cores which, according to the method of the prior art, were threaded into the housing which sometimes led to deformations of the cores and / or said housing.
  • the upper core comprises, as in the case of Figure 4, housing 18 ( Figure 8) for the inlet cores.
  • Figure 8 shows the two upper and lower 62 cores 60, the latter comprising the portion 64 of the housing 68 of conduits, the other portion 66 of the housing 68 being formed in the upper core 62.
  • the lower core 60 is first deposited in the mold, then the exhaust cores 12 are remouloulés in the parts 64 of the housing 68.
  • the upper core 62 is then molded on the lower core 60 and the cores 12, the parts 66 to cap the exhaust cores 12.
  • the intake cores 14 are then remmoulés in their housing 18.
  • the exhaust cores 12 are thus placed by performing a movement from top to bottom, preferably vertically.
  • each of the parts 64 of these housing 16 is preferably half of a housing of these cores (like a half-shell), the another half being formed by the other portion 66 of the upper core.
  • the invention makes it possible to shape the shape of the housings 68 in the desired manner so that the water circulates as close as possible to the hot parts of the cylinder head, as well as closer to the injectors and the valve seats, and to limit the thicknesses of metal around the ducts.
  • the invention also makes it possible to avoid deformation of the cores of the ducts and therefore deformation of these ducts and the flow constraints in these ducts generated by said deformations.
  • the water cores 60 and 62 are removed, thus forming lower and upper hollow portions in which the water circulates.
  • the circulation of water in the cylinder head is represented in FIG. 7 by arrows.
  • the circulation of water between the lower part and the upper part is represented by the vertical arrows and is provided by holes 70 in the lower and upper 60 and 62 cores (FIG. 7).
  • the number, the distribution and the diameter of these different holes or passages allows to control the flow of water passing from the lower part to the upper part, post to position, and thus allows a more homogeneous cooling of the cylinder head.
  • Another advantage of the present invention is to obtain a strengthening of the rigidity of the cylinder head through the formation of a thin layer of metal (a "rib” or “fabric") separating the two lower and upper parts of the breech.
  • This reinforcement rib approximately 5 mm thick, is illustrated in FIGS. 9 and 10 which represent two different sections of the yoke.
  • the lower water nuclei 80 and upper 82 are separated by a rib ⁇
  • the bore 86 or passage between the lower part and the upper part of the cylinder head is closed by a sealing ball 88.
  • the wells 90 and 92 are passages for the bolts for fixing the cylinder head.
  • the lower core 80 and the upper core 82 surround a housing 94 for receiving an exhaust duct.
  • the reinforcing rib 84 extends over the entire length of the bolt. This rib brings a gain in terms of mechanical strength but also in terms of acoustic performance.
  • the method of the invention optimizes the cooling of the tablature of the cylinder head (part of the cylinder head that caps the crankcase), to homogenize the cooling the breech; to remool more easily, optimize fluid flow rates in the ducts, optimize the thickness and mass of the cylinder head and finally strengthen the cylinder head by the formation of a rib.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

The invention relates to a method for casting the cylinder head of a heat engine cooled by a coolant, wherein cores are placed in a mold, in particular a water core (61) including recesses (68) for receiving pipe cores (12). According to the invention, the water core (61) consists of two cores, i.e. a lower core (60) and an upper core (62), said pipe cores (12) being assembled in said recesses (68) of the lower core, and the upper core (62) then being assembled on the lower core (60) and on the pipe cores (12).

Description

Procédé de fabrication par coulée d'une culasse de moteur thermique Process for the production by casting of an engine cylinder head
[0001] La présente invention concerne un procédé de fabrication, par coulée de métal, d'une culasse d'un moteur thermique.The present invention relates to a method of manufacturing, by metal casting, a cylinder head of a heat engine.
[0002] La culasse d'un moteur thermique est une pièce complexe, en fonte ou en aluminium, comportant le plus souvent les conduits d'admission, les conduits d'échappement et des chambres d'eau dans lesquelles peut circuler un fluide de refroidissement (fluide caloporteur).The cylinder head of a heat engine is a complex piece, cast iron or aluminum, most often comprising the intake ducts, the exhaust ducts and water chambers in which can circulate a cooling fluid (coolant).
[0003] Les culasses sont soumises à de fortes contraintes mécaniques et thermiques. Elles sont donc soigneusement refroidies par de larges chambres de fluide caloporteur (appelées chambres d'eau) qui doivent entourées au plus près les chambres de combustion et les conduits d'échappement. La circulation du fluide caloporteur (ci-après désigné par « eau » pour simplifier) doit être définie pour offrir le meilleur refroidissement possible au plus près des chambres de combustion. Un soin tout particulier est apporté à la forme des conduits, notamment les conduits d'admission, la section de passage des conduits devant restée constante pour obtenir une bonne circulation des fluides (air frais, gaz d'échappement).The cylinder heads are subjected to high mechanical and thermal stresses. They are therefore carefully cooled by large heat transfer fluid chambers (called water chambers) which must be surrounded as close as possible to the combustion chambers and the exhaust ducts. The circulation of the coolant (hereinafter referred to as "water" for simplicity) must be defined to provide the best possible cooling closer to the combustion chambers. Particular attention is given to the shape of the ducts, especially the intake ducts, the passage section of the ducts before remained constant to obtain good circulation of fluids (fresh air, exhaust gas).
[ooo4] . La culasse brute est obtenue en fonderie, généralement suivant le procédé dit de « coulée gravité coquille », par coulée de métal (fonte ou aluminium) dans un moule composé d'un cadre métallique et d'un assemblage de noyaux de sable. Le métal en fusion remplit les espaces laissés libres entre le cadre métallique et les différents noyaux de sable.[ooo4]. The raw yoke is obtained in a foundry, generally according to the so-called "shell gravity casting" process, by casting metal (cast iron or aluminum) in a mold composed of a metal frame and an assembly of sand cores. The molten metal fills the spaces left free between the metal frame and the various sand cores.
[ooo5] Les problèmes posés et résolus, au moins en partie, par la présente invention sont illustrés à l'aide des figures 1 à 6 qui montrent l'art antérieur.[0oo5] The problems posed and solved, at least in part, by the present invention are illustrated with the help of Figures 1 to 6 which show the prior art.
[0006] La figure 1 représente une partie 10 du noyau eau, un noyau échappement 12 et un noyau admission 14. Les noyaux échappement 12 et admission 14 sont placés dans des logements respectivement 16 et 18. Les noyaux sont en sable. Le trou 20 est destiné à être rempli de métal dans lequel sera percé un logement pour une bougie de préchauffage (l'exemple décrit concernant une culasse de moteur Diesel).Figure 1 shows a portion 10 of the water core, an exhaust core 12 and an intake core 14. The exhaust 12 and intake 14 cores are placed in housing respectively 16 and 18. The cores are sand. The hole 20 is intended to be filled with metal in which a housing for a glow plug (the example described for a diesel engine cylinder head).
[0007] Le noyau eau complet 22 est représenté sur la figure 4. Le noyau comporte les logements 16 et 18 des conduits respectivement échappement 12 et admission 14. Les trous 24 seront, au moment de la coulée, remplis de métal qui sera par la suite percé pour former des puits d'injecteurs. Les trous 26 préfigurent les emplacements pour les piliers de vis de culasse. Les protubérances 28 sont des portées de noyaux dont la fonction est d'éviter que le noyau eau ne se soulève lors de la coulée du métal dans le moule.The complete water core 22 is shown in Figure 4. The core comprises the housing 16 and 18 respectively exhaust ducts 12 and 14 admission. The holes 24 will be, at the time of casting, filled with metal that will be by the subsequently drilled to form injector wells. Holes 26 prefigure the locations for the bolts of bolt. The protuberances 28 are staves of nuclei whose function is to prevent the water core from rising during the casting of the metal in the mold.
[oooδ] Le fluide caloporteur (pour simplifier on désignera par la suite ce fluide par de l'eau) arrive dans la culasse selon la flèche 30, circule dans la culasse (donc dans le noyau eau 22) selon le sens de la flèche 32 et sort de la culasse comme indiqué par la flèche 34.[oooδ] The heat transfer fluid (for simplicity will be designated later by this fluid by water) arrives in the cylinder head according to the arrow 30, circulates in the cylinder head (and thus in the water core 22) in the direction of the arrow 32 and comes out of the bolt as indicated by the arrow 34.
[0009] Les noyaux échappement 12 et admission 14 sont insérés dans les logements respectivement 16 et 18. Ces noyaux sont principalement en sable et donc relativement fragiles. Comme indiqué précédemment, il est important que les noyaux 12 et 14 ne soient pas déformés, notamment que leur diamètre extérieur ne soit pas diminué, Ces plats constitueront une entrave à la circulation des gaz d'échappement. Il en résulte une diminution du débit d'air.The exhaust cores 12 and 14 are inserted in the housing respectively 16 and 18. These cores are mainly sand and therefore relatively fragile. As indicated above, it is important that the cores 12 and 14 are not deformed, especially that their outer diameter is not decreased, These dishes will be an obstacle to the flow of exhaust gas. This results in a decrease in the air flow.
[ooio] De plus, afin de pouvoir introduire aisément les noyaux échappement et admission, il est nécessaire que les logements 16 et 18 soient assez grands. Il en résulte une ouverture 42 (figure 3) importante des logements de conduits dans le noyau eau 12 et donc une épaisseur de matière élevée au dépend de la masse de la culasse.[ooio] In addition, in order to easily introduce the exhaust and intake cores, it is necessary that the housings 16 and 18 are large enough. This results in a large opening 42 (Figure 3) of the duct housings in the water core 12 and thus a high material thickness at the expense of the mass of the cylinder head.
[0011] Les figures 5 et 6 représentent respectivement une vue de dessus du noyau eau (figure 5) et une vue de coté (figure 6 - coupe selon A de la figure 5). Ces figures 5 et 6 illustrent un cas où il a été nécessaire de faire un plat 46 sur le conduit d'admission 48, et donc de le déformer, de façon à permettre une circulation d'eau suffisante pour obtenir un refroidissement correct de l'injecteur dont l'emplacement est figuré par le trou 50. La partie métallique de la culasse est indiquée par la référence 54. Le plat 46 permet une circulation suffisante de l'eau par le passage 52, mais au détriment du débit d'air dans le conduit d'admission.Figures 5 and 6 respectively show a top view of the water core (Figure 5) and a side view (Figure 6 - section along A of Figure 5). These Figures 5 and 6 illustrate a case where it was necessary to make a plate 46 on the intake duct 48, and thus to deform, so as to allow sufficient water circulation to obtain a proper cooling of the injector whose location is shown by the hole 50. The metal part of the cylinder head is indicated by the 54. The plate 46 allows sufficient circulation of water through the passage 52, but at the expense of the air flow in the intake duct.
[0012] La présente invention concerne un procédé qui ne présente pas, ou de façon atténuée, au moins l'un des inconvénients de l'art antérieur.The present invention relates to a method which does not have, or attenuated, at least one of the disadvantages of the prior art.
[0013] De façon plus précise, l'invention concerne un procédé de fabrication par coulée d'une culasse de moteur thermique refroidie par un fluide caloporteur, selon lequel des noyaux sont placés dans un moule, notamment un noyau eau comprenant des logements destinés à recevoir des noyaux de conduits. Selon ledit procédé, le noyau eau est réalisé en deux noyaux, un noyau inférieur et un noyau supérieur, lesdits noyaux de conduits étant remmoulés dans lesdits logements du noyau inférieur, le noyau supérieur étant ensuite remmoulé sur le noyau inférieur et sur les noyaux de conduits.More specifically, the invention relates to a method of manufacturing by casting a heat engine cylinder cooled by a coolant, wherein the cores are placed in a mold, including a water core comprising housing for receive conduit cores. According to said method, the water core is made in two cores, a lower core and an upper core, said conduit cores being molded into said lower core housings, the upper core then being molded onto the lower core and the conduit cores .
[0014] Dans une variante, lesdits noyaux de conduits sont remmoulés de haut en bas, sensiblement verticalement, dans lesdits logements ;In a variant, said conduit cores are remmoulés from top to bottom, substantially vertically, in said housing;
[0015] Dans une variante, chacun desdits noyaux inférieur et supérieur comporte une partie de chacun desdits logements, de préférence une moitié de l'un desdits logements.In a variant, each of said lower and upper cores comprises a portion of each of said housing, preferably a half of one of said housing.
[0016] Dans une variante, la séparation entre les noyaux inférieur et supérieur crée au moment de la coulée une nervure qui renforce la rigidité mécanique de la culasse.In a variant, the separation between the lower and upper cores creates at the time of casting a rib that enhances the mechanical rigidity of the cylinder head.
[0017] Dans une variante, des perçages sont percés dans les noyaux inférieur et supérieur de façon à réaliser des passages pour la circulation de fluide caloporteur entre les parties inférieure et supérieure de la culasse.In a variant, bores are drilled in the lower and upper cores so as to provide passages for the circulation of heat transfer fluid between the lower and upper parts of the cylinder head.
[0018] Dans une variante, les caractéristiques desdits perçages sont dimensionnés pour que les passages permettent le débit de liquide caloporteur souhaité entre les parties inférieure et supérieure de la culasse. Par dimensionnement, on entend le nombre de perçages, leur répartition et leurs diamètres. [0019] Dans une variante, les conduits desdits noyaux de conduits destinés à être posés dans lesdits logements sont des conduits qui subissent une forte élévation de température, par exemple les conduits d'échappement.In a variant, the characteristics of said bores are sized so that the passages allow the flow of coolant desired between the lower and upper parts of the cylinder head. Sizing means the number of holes, their distribution and their diameters. In a variant, the conduits of said conduit cores intended to be placed in said housing are ducts which undergo a high temperature rise, for example the exhaust ducts.
[0020] D'autres avantages et caractéristiques de l'invention apparaîtront au cours de la description qui suit de plusieurs modes de réalisation de l'invention, donnés à titre d'exemples non limitatifs, en référence aux dessins annexés et sur lesquels :Other advantages and features of the invention will become apparent from the following description of several embodiments of the invention, given by way of non-limiting examples, with reference to the accompanying drawings and in which:
• les figures 1 à 6 illustrent l'art antérieur et ses inconvénients,FIGS. 1 to 6 illustrate the prior art and its disadvantages,
• les figures 7 et 8 illustrent le procédé selon l'invention, etFIGS. 7 and 8 illustrate the method according to the invention, and
• les figures 9 et 10 montrent un avantage de l'invention, à savoir la possibilité d'obtenir une nervure de renforcement de la culasse.FIGS. 9 and 10 show an advantage of the invention, namely the possibility of obtaining a rib for reinforcing the cylinder head.
[0021] Selon l'invention, le noyau eau 61 est constitué d'un noyau eau inférieur 60 et d'un noyau eau supérieur 62 (figure 7), les deux noyaux inférieur et supérieur pouvant être imaginés comme le résultat de couper le noyau eau 22 de la figure 4 en deux parties dans le sens longitudinal. Les noyaux inférieur et supérieur comportent chacun une partie 64 des logements 68 pour le noyau inférieur et une partie 66 pour le noyau supérieur des noyaux échappement 12. Le partage du noyau eau en deux parties permet de pouvoir remmouler (c'est-à-dire assembler avec précision, juste avant la coulée de métal) facilement les noyaux de conduits qui, selon la méthode de l'art antérieur, étaient enfilés dans les logements ce qui conduisait parfois à des déformations des noyaux et/ou desdits logements.According to the invention, the water core 61 consists of a lower water core 60 and an upper water core 62 (Figure 7), the two lower and upper cores can be imagined as the result of cutting the core. water 22 of Figure 4 in two parts in the longitudinal direction. The lower and upper cores each comprise a portion 64 of the housings 68 for the lower nucleus and a portion 66 for the upper nucleus of the exhaust nuclei 12. The division of the water nucleus into two parts makes it possible to remold (that is to say Precisely assembling, just prior to the casting of metal) easily the conduit cores which, according to the method of the prior art, were threaded into the housing which sometimes led to deformations of the cores and / or said housing.
[0022] Le noyau supérieur comporte, comme dans le cas de la figure 4, des logements 18 (figure 8) pour les noyaux admission.The upper core comprises, as in the case of Figure 4, housing 18 (Figure 8) for the inlet cores.
[0023] Le procédé est illustré sur la figure 8 qui montre les deux noyaux supérieur 62 et inférieur 60, ce dernier comportant la partie 64 des logements 68 de conduits, l'autre partie 66 des logements 68 étant formée dans le noyau supérieur 62. Le noyau inférieur 60 est d'abord déposé dans le moule, puis les noyaux échappement 12 sont remmoulés dans les parties 64 des logements 68. Le noyau supérieur 62 est ensuite remmoulé sur le noyau inférieur 60 et les noyaux 12, les parties 66 venant coiffer les noyaux échappement 12. Les noyaux admission 14 sont ensuite remmoulés dans leurs logements 18.The method is illustrated in Figure 8 which shows the two upper and lower 62 cores 60, the latter comprising the portion 64 of the housing 68 of conduits, the other portion 66 of the housing 68 being formed in the upper core 62. The lower core 60 is first deposited in the mold, then the exhaust cores 12 are remouloulés in the parts 64 of the housing 68. The upper core 62 is then molded on the lower core 60 and the cores 12, the parts 66 to cap the exhaust cores 12. The intake cores 14 are then remmoulés in their housing 18.
[0024] Les noyaux échappement 12 sont ainsi posés en effectuant un mouvement de haut en bas, de préférence verticalement.The exhaust cores 12 are thus placed by performing a movement from top to bottom, preferably vertically.
[0025] Afin de positionner aisément et de façon certaine les noyaux échappement 12 dans les logements 16, chacune des parties 64 de ces logements 16 constitue de préférence la moitié d'un logement de ces noyaux (comme une demi-coquille), l'autre moitié étant formée par l'autre partie 66 du noyau supérieur. L'invention permet de façonner la forme des logements 68 de la façon souhaitée de sorte que l'eau circule au plus près des parties chaudes de la culasse, ainsi qu'au plus près des injecteurs et des sièges de soupapes, et de limiter les épaisseurs de métal autour des conduits. L'invention permet également d'éviter les déformations des noyaux des conduits et donc une déformation de ces conduits et les contraintes de débit dans ces conduits engendrées par lesdites déformations.To easily and surely position the exhaust cores 12 in the housing 16, each of the parts 64 of these housing 16 is preferably half of a housing of these cores (like a half-shell), the another half being formed by the other portion 66 of the upper core. The invention makes it possible to shape the shape of the housings 68 in the desired manner so that the water circulates as close as possible to the hot parts of the cylinder head, as well as closer to the injectors and the valve seats, and to limit the thicknesses of metal around the ducts. The invention also makes it possible to avoid deformation of the cores of the ducts and therefore deformation of these ducts and the flow constraints in these ducts generated by said deformations.
[0026] Après coulage de la culasse, les noyaux eau 60 et 62 sont éliminés, formant ainsi des parties creuses inférieure et supérieure dans lesquelles circule l'eau. La circulation d'eau dans la culasse est représentée sur la figure 7 par des flèches. La circulation d'eau entre la partie inférieure et la partie supérieure est représentée par les flèches verticales et est assurée par des perçages 70 dans les noyaux inférieur 60 et supérieur 62 (figure 7). Le nombre, la répartition et le diamètre de ces différents perçages ou passages permet de piloter le débit d'eau passant de la partie inférieure à la partie supérieure, poste à poste, et ainsi permet d'avoir un refroidissement plus homogène de la culasse.After casting the cylinder head, the water cores 60 and 62 are removed, thus forming lower and upper hollow portions in which the water circulates. The circulation of water in the cylinder head is represented in FIG. 7 by arrows. The circulation of water between the lower part and the upper part is represented by the vertical arrows and is provided by holes 70 in the lower and upper 60 and 62 cores (FIG. 7). The number, the distribution and the diameter of these different holes or passages allows to control the flow of water passing from the lower part to the upper part, post to position, and thus allows a more homogeneous cooling of the cylinder head.
[0027] Un autre avantage de la présente invention est d'obtenir un renforcement de la rigidité de la culasse grâce à la formation d'une fine couche de métal (une « nervure » ou « toile ») séparant les deux parties inférieure et supérieure de la culasse. Cette nervure de renforcement, d'épaisseur 5 mm environ, est illustrée sur les figures 9 et 10 qui représentent deux coupes différentes de la culasse. Sur la figure 9, les noyaux eau inférieur 80 et supérieur 82 sont séparés par une nervure όAnother advantage of the present invention is to obtain a strengthening of the rigidity of the cylinder head through the formation of a thin layer of metal (a "rib" or "fabric") separating the two lower and upper parts of the breech. This reinforcement rib, approximately 5 mm thick, is illustrated in FIGS. 9 and 10 which represent two different sections of the yoke. In FIG. 9, the lower water nuclei 80 and upper 82 are separated by a rib ό
84. Le perçage 86 ou passage entre la partie inférieure et la partie supérieure de la culasse est fermé par une bille d'étanchéité 88. Les puits 90 et 92 sont des passages pour les vis de fixation de la culasse.84. The bore 86 or passage between the lower part and the upper part of the cylinder head is closed by a sealing ball 88. The wells 90 and 92 are passages for the bolts for fixing the cylinder head.
[0028] Sur la figure 10, le noyau inférieur 80 et le noyau supérieur 82 entourent un logement 94 destiné à recevoir un conduit d'échappement. La nervure de renforcement 84 s'étend sur toute la longueur de la culasse. Cette nervure apporte un gain en termes de tenue mécanique mais également en termes de performance acoustique.In Figure 10, the lower core 80 and the upper core 82 surround a housing 94 for receiving an exhaust duct. The reinforcing rib 84 extends over the entire length of the bolt. This rib brings a gain in terms of mechanical strength but also in terms of acoustic performance.
[0029] Au vue de la description qui précède, il est apparent que le procédé de l'invention permet d'optimiser le refroidissement de la tablature de la culasse (partie de la culasse qui coiffe le carter cylindres), d'homogénéiser le refroidissement de la culasse ; de remmouler plus facilement, d'optimiser les débits de fluide dans les conduits, d'optimiser les épaisseurs et de la masse de la culasse et enfin de renforcer la culasse par la formation d'une nervure.In view of the above description, it is apparent that the method of the invention optimizes the cooling of the tablature of the cylinder head (part of the cylinder head that caps the crankcase), to homogenize the cooling the breech; to remool more easily, optimize fluid flow rates in the ducts, optimize the thickness and mass of the cylinder head and finally strengthen the cylinder head by the formation of a rib.
[0030] D'autres modes de réalisation que ceux décrits et représentés peuvent être conçus par l'homme du métier sans sortir du cadre de la présente invention. Other embodiments than those described and shown may be designed by those skilled in the art without departing from the scope of the present invention.

Claims

REVENDICATIONS
1. Procédé de fabrication par coulée d'une culasse de moteur thermique refroidie par un fluide caloporteur, selon lequel des noyaux sont placés dans un moule, notamment un noyau eau (61 ) comprenant des logements (68,) destinés à recevoir des noyaux de conduits (12), le procédé étant caractérisé en ce que ledit noyau eau (61 ) est réalisé en deux noyaux, un noyau inférieur (60) et un noyau supérieur (62), lesdits noyaux de conduits (12) étant remmoulés dans lesdits logements (68) du noyau inférieur, le noyau supérieur (62) étant ensuite remmoulé sur le noyau inférieur (60) et sur les noyaux de conduits (12).1. A method of manufacturing by casting of a heat engine cylinder cooled by a heat transfer fluid, wherein the cores are placed in a mold, in particular a water core (61) comprising housings (68,) intended to receive cores of conduits (12), the method being characterized in that said water core (61) is made of two cores, a lower core (60) and an upper core (62), said conduit cores (12) being remolded in said housings (68) of the lower core, the upper core (62) being then molded onto the lower core (60) and the conduit cores (12).
2. Procédé selon la revendication 1 caractérisé en ce que lesdits noyaux de conduits (12) sont remmoulés de haut en bas, sensiblement verticalement, dans lesdits logements(68).2. Method according to claim 1 characterized in that said conduit cores (12) are remmoulés from top to bottom, substantially vertically, in said housing (68).
3. Procédé selon l'une des revendications précédentes caractérisé en ce que chacun desdits noyaux inférieur et supérieur comporte une partie (64, 66) de chacun desdits logements.3. Method according to one of the preceding claims characterized in that each of said lower and upper cores comprises a portion (64, 66) of each of said housing.
4. Procédé selon la revendication 3 caractérisé en ce que chacun desdits noyaux inférieur et supérieur comporte une moitié de l'un desdits logements.4. Method according to claim 3 characterized in that each of said lower and upper cores comprises a half of one of said housing.
5. Procédé selon l'une des revendications précédentes, caractérisé en ce que la séparation entre les noyaux inférieur et supérieur crée au moment de la coulée une nervure (84) qui renforce la rigidité mécanique de la culasse.5. Method according to one of the preceding claims, characterized in that the separation between the lower and upper cores creates at the time of casting a rib (84) which reinforces the mechanical rigidity of the cylinder head.
6. Procédé selon l'une des revendications précédentes caractérisé en ce que des perçages (70) sont réalisés dans les noyaux inférieur (60) et supérieur (62) de façon à former des passages pour la circulation de fluide caloporteur entre les parties inférieure et supérieure de la culasse.6. Method according to one of the preceding claims characterized in that holes (70) are formed in the lower (60) and upper (62) cores so as to form passages for the circulation of coolant between the lower and lower parts. top of the breech.
7. Procédé selon la revendication 6 caractérisé en ce que les caractéristiques desdits perçages (70) sont choisies en fonction du débit de liquide caloporteur souhaité entre les parties inférieure et supérieure de la culasse. 7. Method according to claim 6 characterized in that the characteristics of said bores (70) are chosen as a function of the flow of heat transfer liquid desired between the lower and upper parts of the cylinder head.
8. Procédé selon la revendication 7 caractérisé en ce que lesdites caractéristiques comprennent au moins l'une des caractéristiques suivantes : le nombre de trous, la répartition des trous et le diamètre des trous.8. The method of claim 7 characterized in that said characteristics comprise at least one of the following characteristics: the number of holes, the distribution of holes and the diameter of the holes.
9. Procédé selon l'une des revendications précédentes caractérisé en ce que les conduits desdits noyaux de conduits (12) destinés à être posés dans lesdits logements (68) sont des conduits qui subissent une forte élévation de température.9. Method according to one of the preceding claims characterized in that the conduits of said conduit cores (12) intended to be placed in said housing (68) are ducts which undergo a high temperature rise.
10. Procédé selon la revendication 9 caractérisé en ce que lesdits conduits sont des conduits d'échappement. 10. The method of claim 9 characterized in that said ducts are exhaust ducts.
PCT/FR2010/050789 2009-05-14 2010-04-26 Method for casting the cylinder head of a heat engine WO2010130911A1 (en)

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FR0953209 2009-05-14
FR0953209A FR2945463B1 (en) 2009-05-14 2009-05-14 PROCESS FOR THE CAST PRODUCTION OF A THERMAL MOTOR HEAD

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012106082A1 (en) * 2012-07-06 2014-01-09 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Device for manufacturing casting portion for cooling internal combustion engine, has joint connection of overhead panel with lower shell, and overhead panel that is fixed in transverse and vertical direction of lower shell
DE102018128020A1 (en) * 2018-11-09 2020-05-14 Bayerische Motoren Werke Aktiengesellschaft Mold and method for manufacturing a crankcase

Citations (4)

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Publication number Priority date Publication date Assignee Title
US2820267A (en) * 1953-12-17 1958-01-21 Gen Motors Corp Cylinder head coring
GB789858A (en) * 1956-04-11 1958-01-29 Gen Motors Corp Improvements in and relating to casting cylinder heads for internal combustion engines
US2858587A (en) * 1954-12-20 1958-11-04 Gen Motors Corp Cylinder head coring for overhead valve engines
WO2007105108A2 (en) * 2006-03-15 2007-09-20 Toyota Jidosha Kabushiki Kaisha Method for producing cylinder head and cylinder head

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
US2820267A (en) * 1953-12-17 1958-01-21 Gen Motors Corp Cylinder head coring
US2858587A (en) * 1954-12-20 1958-11-04 Gen Motors Corp Cylinder head coring for overhead valve engines
GB789858A (en) * 1956-04-11 1958-01-29 Gen Motors Corp Improvements in and relating to casting cylinder heads for internal combustion engines
WO2007105108A2 (en) * 2006-03-15 2007-09-20 Toyota Jidosha Kabushiki Kaisha Method for producing cylinder head and cylinder head

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012106082A1 (en) * 2012-07-06 2014-01-09 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Device for manufacturing casting portion for cooling internal combustion engine, has joint connection of overhead panel with lower shell, and overhead panel that is fixed in transverse and vertical direction of lower shell
DE102018128020A1 (en) * 2018-11-09 2020-05-14 Bayerische Motoren Werke Aktiengesellschaft Mold and method for manufacturing a crankcase
US11219941B2 (en) 2018-11-09 2022-01-11 Bayerische Motoren Werke Aktiengesellschaft Ingot mold and process for manufacturing a crankcase
DE102018128020B4 (en) 2018-11-09 2024-05-23 Bayerische Motoren Werke Aktiengesellschaft Mould and method for producing a crankcase

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FR2945463A1 (en) 2010-11-19
FR2945463B1 (en) 2014-11-21

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