EP0595676A1 - Fitting of metallic inserts for expansion joint in cylinderhead of an internal combustion engine - Google Patents

Fitting of metallic inserts for expansion joint in cylinderhead of an internal combustion engine Download PDF

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Publication number
EP0595676A1
EP0595676A1 EP93402449A EP93402449A EP0595676A1 EP 0595676 A1 EP0595676 A1 EP 0595676A1 EP 93402449 A EP93402449 A EP 93402449A EP 93402449 A EP93402449 A EP 93402449A EP 0595676 A1 EP0595676 A1 EP 0595676A1
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EP
European Patent Office
Prior art keywords
inserts
cluster
cylinder head
arrangement
internal combustion
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
Application number
EP93402449A
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German (de)
French (fr)
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EP0595676B1 (en
Inventor
Didier Girard
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Automobiles Peugeot SA
Automobiles Citroen SA
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Automobiles Peugeot SA
Automobiles Citroen SA
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Publication of EP0595676A1 publication Critical patent/EP0595676A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0009—Cylinders, pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F2001/008—Stress problems, especially related to thermal stress
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F2001/248—Methods for avoiding thermal stress-induced cracks in the zone between valve seat openings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F2200/00—Manufacturing
    • F02F2200/06—Casting

Definitions

  • the subject of the invention is the metal inserts intended to form expansion joints and arranged for casting, in a cylinder head of an internal combustion engine, in the zones subjected to strong temperature gradients, in particular between two valve seats.
  • the invention also relates to a cylinder head fitted with such inserts.
  • expansion joints constituted by pressed sheet inserts which are, depending on the molding process used, either part, embedded in the sand before casting, or inserted between the metal cores intended to form the conduits. After machining the valve seat housings, these inserts only remain two separate arcs joining these seats in the most vulnerable areas.
  • Patent FR 90 13 435 describes an insert comprising a cylindrical body, one end of which placed in the cylinder head opposite the hot surface has a folded collar intended to avoid the concentration of stresses. Before the cylinder head is poured, the insert is partially embedded in the sand cores intended to provide the intake and exhaust ducts. When machining the valve seat housings, the non-functional parts of the insert are removed by the tool and only the parts in a circular arc remain, constituting the expansion joints and arranged between the conduits.
  • FIGS. 1 and 2 a cylinder head of a diesel engine comprising two intake valves 1, 2, per cylinder, an exhaust valve 3 and a combustion prechamber 4.
  • the junction lines between these different elements are also subject to thermal stresses and therefore require the installation of expansion joints, the number and arrangement of which depend on the temperatures of the wall and the directions of expansion observed in each particular case.
  • Figures 1 and 2 show two possibilities for installing these seals.
  • the two seals 5 and 6 are arranged symmetrically, in an arc, the concavities of which face each other according to a projection parallel to the axis of the cylinder, for each possible direction.
  • Figure 2 shows a cylinder head having a single seal 7 per direction.
  • the invention provides an arrangement of metal inserts, composed of a body connected to a folded edge forming a collar, arranged in the casting, to form at least one expansion joint, in an engine cylinder head with internal combustion comprising more than two channels per cylinder, separated by zones subjected to thermal stresses.
  • the inserts are interconnected by tabs or partitions which have come into shape with said inserts to form a cluster arranged and maintained in the cylinder head mold so that each of the elementary inserts is located, after casting, in one of the zones of constraint located between two adjacent channels.
  • the cluster 8 shown in Figures 3 and 4 is made of stamped sheet metal, it is composed of four identical elementary inserts 10.
  • Each insert is formed of a cylindrical body 14 connected to a folded edge forming a collar 15, said collar having two flares 16 and 17 at a salient angle whose vertices 16s and 17s are arranged on a radial axis XX.
  • Each insert 10 is joined to the two adjacent inserts by a tongue 20, 21 situated in the plane of the collar 15 and connected to the latter in a zone 18, 19 close to the radial axis ZZ, perpendicular to the axis XX joining the tops of the flares of said collar.
  • flared zones 16 and 17 which constitute the functional parts of the insert capable of ensuring the function of expansion joint in the cylinder head.
  • Their protruding angle configuration avoids stress concentrations and prevents them from turning during the machining of the valve seats and the combustion prechamber.
  • the cluster arrangement of the four elementary inserts 10 is made along two perpendicular axes of symmetry I-I, II-II.
  • the axes XX of each insert 10 are two by two concurrent at a point 28, 29 located on the same axis of symmetry II of the cluster 8.
  • the latter also comprises two fins 24, 25 formed with the tongues 21 and folded at right angles to them. These fins are thus arranged on the second axis of symmetry II-II of the cluster 8.
  • the cluster of inserts 8 is placed on the bottom of the plate 27 so that its axis of symmetry II is perpendicular to the axes 43, 44 of the cores, respectively, 33 and 34 and that its axis of symmetry II-II is perpendicular to the axes 41, 42, respectively, of the cores 31 and 32.
  • the tongues 21 are tangent to the latter cores so that the fins 24, 25 which they carry are engaged in housings 35, 36 made longitudinally on the outer wall of said cores, to ensure the positioning of the cluster and its keeping in rotation in the plane of the plate 27.
  • metal pins cover the cores 31-33 to form the intake (pins 37 and 38) and exhaust (pin 39) conduits.
  • the pins 37 and 38 which cover the cores carrying the housings of the fins 24 and 25 ensure the maintenance of the cluster in the vertical plane.
  • the cluster 8 is therefore perfectly maintained in all planes during casting.
  • the elementary inserts 10 are inserted between the cores so that their functional zones formed by the flares 16, 17 of the collars 15 cover the expansion orientations in an arc of a circle as defined in FIG. 1.
  • FIGs 5 and 7 illustrate an alternative embodiment of the cluster of inserts which can be used when only one expansion joint is required per sensitive area, as shown in Figure 2.
  • each elementary insert 110 comprises a semi-cylindrical body 114 connected to a collar 115 forming a single flare 116 in the form of a projecting angle.
  • Each of the inserts is connected to the two adjacent inserts by a partition 120, 121 formed in shape with the body 114 and / or the collar 115.
  • the fins 124, 125 for positioning the cluster are carried by the two partitions 121 facing each other. The installation of such an insert in the cylinder head mold is identical to that which has just been described.
  • the cluster of inserts according to the invention is easy to handle, it can be carried out both manually and automatically. Thanks to its means of indexing and holding in place, it makes it possible to reduce the time of the operation while ensuring greater security of positioning.

Abstract

Arrangement of metallic inserts 10 including a body 14 connected to a folded edge forming a collar 15 located before pouring in order to form at least one expansion joint in an internal combustion engine cylinder head including more than two passages per cylinder, separated by zones subjected to thermal stresses. These inserts are joined together by tongues or partitions 20, 21 formed when forming the said inserts in order to form a cluster 8 which is located and held in the cylinder head mould so that each of the elementary inserts 10 is embedded, after pouring, in one of the zones of stress situated between two adjacent passages. Application to pouring diesel engine cylinder heads. <IMAGE>

Description

L'invention a pour objet les inserts métalliques destinés à former des joints d'expansion et disposés à la coulée, dans une culasse de moteur à combustion interne, dans les zones soumises à de forts gradients de température, notamment entre deux sièges de soupapes. L'invention a également pour objet une culasse équipée de tels inserts.The subject of the invention is the metal inserts intended to form expansion joints and arranged for casting, in a cylinder head of an internal combustion engine, in the zones subjected to strong temperature gradients, in particular between two valve seats. The invention also relates to a cylinder head fitted with such inserts.

Pour éviter la formation de criques d'origine thermique on utilise actuellement de façon courante dans les culasses, notamment de moteurs diesel, des joints d'expansion constitués par des inserts en tôle emboutie qui sont, suivant le procédé de moulage utilisé, soit, en partie, noyés dans le sable avant la coulée, soit insérés entre les noyaux métalliques destinés à former les conduits. Après usinage des logements des sièges de soupape, il ne reste plus de ces inserts que deux arcs distincts joignant ces portées dans les zones les plus vulnérables.To avoid the formation of cracks of thermal origin, currently used in cylinder heads, especially of diesel engines, expansion joints constituted by pressed sheet inserts which are, depending on the molding process used, either part, embedded in the sand before casting, or inserted between the metal cores intended to form the conduits. After machining the valve seat housings, these inserts only remain two separate arcs joining these seats in the most vulnerable areas.

Le brevet FR 90 13 435 décrit un insert comportant un corps cylindrique dont une extrémité disposée dans la culasse à l'opposé de la surface chaude présente une collerette rabattue destinée à éviter la concentration des contraintes. Avant la coulée de la culasse l'insert est en partie noyé dans les noyaux de sable destinés à ménager les conduits d'admission et d'échappement. Lors de l'usinage des logements des sièges de soupape, les parties de l'insert non fonctionnelles sont enlevées par l'outil et il ne reste que les parties en arc de cercle constituant les joints d'expansion et disposées entre les conduits.Patent FR 90 13 435 describes an insert comprising a cylindrical body, one end of which placed in the cylinder head opposite the hot surface has a folded collar intended to avoid the concentration of stresses. Before the cylinder head is poured, the insert is partially embedded in the sand cores intended to provide the intake and exhaust ducts. When machining the valve seat housings, the non-functional parts of the insert are removed by the tool and only the parts in a circular arc remain, constituting the expansion joints and arranged between the conduits.

On connaît également, notamment par le brevet européen 126 922, des inserts métalliques composés de deux pièces en arc de cercle réunies par des parties de maintien insérées à force entre les noyaux de fonderie, avant la coulée du métal.Also known, in particular from European patent 126 922, are metallic inserts composed of two parts in an arc of a circle joined together by holding parts inserted by force between the foundry cores, before the metal is cast.

Lorsque la conformation de la culasse du moteur ne nécessite l'implantation que d'un ou deux inserts de ce type par cylindre, la mise en place de ceux-ci ne présente aucune difficulté. Il n'en va pas de même lorsqu'il s'avère nécessaire d'en implanter plusieurs. C'est le cas, notamment, pour les culasses des moteurs diesel multisoupapes.When the conformation of the engine cylinder head requires the installation of only one or two inserts of this type per cylinder, the installation of these presents no difficulty. It is not the same when it is necessary to establish several. This is the case, in particular, for the cylinder heads of multi-valve diesel engines.

A titre d'exemple, on a représenté schématiquement, figures 1 et 2, une culasse d'un moteur diesel comportant deux soupapes d'admission 1, 2, par cylindre, une soupape d'échappement 3 et une préchambre de combustion 4. Les lignes de jonction entre ces différents éléments sont également soumises aux contraintes thermiques et nécessitent donc l'implantation de joints d'expansion dont le nombre et la disposition dépendent des températures de la paroi et des orientations de dilatation observées dans chaque cas particulier.By way of example, there is shown diagrammatically, FIGS. 1 and 2, a cylinder head of a diesel engine comprising two intake valves 1, 2, per cylinder, an exhaust valve 3 and a combustion prechamber 4. The junction lines between these different elements are also subject to thermal stresses and therefore require the installation of expansion joints, the number and arrangement of which depend on the temperatures of the wall and the directions of expansion observed in each particular case.

Les figures 1 et 2 montrent deux possibilités d'implantation de ces joints. Sur la figure 1, les deux joints 5 et 6 sont disposés symétriquement, en arc de cercle dont les concavités se font face selon une projection parallèle à l'axe du cylindre, pour chaque direction possible. La figure 2 montre une culasse comportant un seul joint 7 par direction.Figures 1 and 2 show two possibilities for installing these seals. In FIG. 1, the two seals 5 and 6 are arranged symmetrically, in an arc, the concavities of which face each other according to a projection parallel to the axis of the cylinder, for each possible direction. Figure 2 shows a cylinder head having a single seal 7 per direction.

Pour réaliser ce type de culasse, il faut donc disposer dans le moule, avant la coulée, quatre inserts par cylindre. L'opération devient ainsi longue, de plus, elle multiplie les risques de mauvais positionnement des inserts et donc les risques de rebut, d'où une augmentation importante des coûts de fabrication.To make this type of cylinder head, you must therefore have four inserts per cylinder in the mold before casting. The operation thus becomes long, moreover, it multiplies the risks of incorrect positioning of the inserts and therefore the risks of scrap, hence a significant increase in manufacturing costs.

Pour remédier à ces problèmes, l'invention propose un agencement d'inserts métalliques, composés d'un corps raccordé à un bord plié formant collet, disposés à la coulée, pour former au moins un joint d'expansion, dans une culasse de moteur à combustion interne comportant plus de deux canaux par cylindre, séparés par des zones soumises à des contraintes thermiques. Selon cet agencement les inserts sont reliés entre eux par des languettes ou cloisons venues de forme avec lesdits inserts pour former une grappe disposée et maintenue dans le moule de la culasse de façon que chacun des inserts élémentaires se trouve implanté, après la coulée, dans l'une des zones de contrainte située entre deux canaux adjacents.To remedy these problems, the invention provides an arrangement of metal inserts, composed of a body connected to a folded edge forming a collar, arranged in the casting, to form at least one expansion joint, in an engine cylinder head with internal combustion comprising more than two channels per cylinder, separated by zones subjected to thermal stresses. According to this arrangement the inserts are interconnected by tabs or partitions which have come into shape with said inserts to form a cluster arranged and maintained in the cylinder head mold so that each of the elementary inserts is located, after casting, in one of the zones of constraint located between two adjacent channels.

Selon d'autres caractéristiques,

  • Chacune des languettes ou cloisons de liaison est engagée dans le moule au contact d'un des noyaux destinés à former les canaux de la culasse.
  • Au moins une languette ou cloison porte une ailette de positionnement coopérant avec un logement pratiqué dans le noyau avec lequel ladite languette ou cloison est en contact.
  • Chaque insert comporte deux parties actives formant joint d'expansion, diamétralement opposées et constituées par deux évasements, en forme d'angle saillant, de son collet.
  • Selon une forme de réalisation, la grappe est formée de quatre inserts élémentaires et les axes réunissant les sommets des évasements précités concourent deux à deux en un point situé sur un axe de symétrie de ladite grappe.
According to other characteristics,
  • Each of the connecting tabs or partitions is engaged in the mold in contact with one of the cores intended to form the channels of the cylinder head.
  • At least one tongue or partition carries a positioning fin cooperating with a housing formed in the core with which said tongue or partition is in contact.
  • Each insert has two active parts forming an expansion joint, diametrically opposite and constituted by two flares, in the form of a projecting angle, from its collar.
  • According to one embodiment, the cluster is formed of four elementary inserts and the axes joining the tops of the aforementioned flares work in pairs at a point located on an axis of symmetry of said cluster.

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui va suivre, pour la compréhension de laquelle on se reportera aux dessins annexés, dans lesquels :

  • les figures 1 et 2 sont des vues schématiques en plan, limitées à un cylindre, d'une culasse montrant deux exemples d'implantation de joints d'expansion,
  • la figure 3 est une vue en plan d'une grappe d'inserts selon l'invention,
  • la figure 4 est une vue perspective d'une grappe d'inserts selon la figure 3,
  • la figure 5 est une vue perspective d'une variante de la grappe d'inserts selon l'invention,
  • la figure 6 est une vue analogue à la figure 1 montrant la grappe selon la figure 4, implantée dans la culasse,
  • la figure 7 est une vue analogue à la figure 2 montrant la grappe selon la figure 5, implantée dans la culasse,
  • la figure 8 est une vue en plan analogue aux précédentes, montrant un moule permettant d'obtenir la culasse selon la figure 6,
  • la figure 8a est une vue en coupe selon AA de la figure 8 et,
  • la figure 8b est une vue en coupe selon BB de la figure 8,
Other characteristics and advantages of the invention will appear on reading the detailed description which follows, for the understanding of which reference will be made to the appended drawings, in which:
  • FIGS. 1 and 2 are schematic plan views, limited to one cylinder, of a cylinder head showing two examples of installation of expansion joints,
  • FIG. 3 is a plan view of a cluster of inserts according to the invention,
  • FIG. 4 is a perspective view of a cluster of inserts according to FIG. 3,
  • FIG. 5 is a perspective view of a variant of the cluster of inserts according to the invention,
  • FIG. 6 is a view similar to FIG. 1 showing the cluster according to FIG. 4, located in the cylinder head,
  • FIG. 7 is a view similar to FIG. 2 showing the cluster according to FIG. 5, located in the cylinder head,
  • FIG. 8 is a plan view similar to the previous ones, showing a mold making it possible to obtain the cylinder head according to FIG. 6,
  • FIG. 8a is a sectional view along AA of FIG. 8 and,
  • FIG. 8b is a sectional view along BB of FIG. 8,

La grappe 8 représentée figures 3 et 4 est réalisée en tôle emboutie, elle est composée de quatre inserts élémentaires 10 identiques. Chaque insert est formé d'un corps cylindrique 14 raccordé à un bord plié formant collet 15, ledit collet présentant deux évasements 16 et 17 en angle saillant dont les sommets 16s et 17s sont disposés sur un axe radial XX. Chaque insert 10 est réuni aux deux inserts adjacents par une languette 20, 21 située dans le plan du collet 15 et raccordée à celui-ci dans une zone 18, 19 voisine de l'axe radial ZZ, perpendiculaire à l'axe XX réunissant les sommets des évasements dudit collet.The cluster 8 shown in Figures 3 and 4 is made of stamped sheet metal, it is composed of four identical elementary inserts 10. Each insert is formed of a cylindrical body 14 connected to a folded edge forming a collar 15, said collar having two flares 16 and 17 at a salient angle whose vertices 16s and 17s are arranged on a radial axis XX. Each insert 10 is joined to the two adjacent inserts by a tongue 20, 21 situated in the plane of the collar 15 and connected to the latter in a zone 18, 19 close to the radial axis ZZ, perpendicular to the axis XX joining the tops of the flares of said collar.

Ce sont ces zones évasées 16 et 17 qui constituent les parties fonctionnelles de l'insert aptes à assurer la fonction de joint d'expansion dans la culasse. Leur configuration en angle saillant permet d'éviter les concentrations de contraintes et les empêche de tourner pendant l'usinage des sièges de soupapes et de la préchambre de combustion.It is these flared zones 16 and 17 which constitute the functional parts of the insert capable of ensuring the function of expansion joint in the cylinder head. Their protruding angle configuration avoids stress concentrations and prevents them from turning during the machining of the valve seats and the combustion prechamber.

La disposition en grappe des quatre inserts élémentaires 10 se fait selon deux axes de symétrie I-I, II-II, perpendiculaires. Les axes XX de chaque insert 10 sont concourants deux à deux en un point 28, 29 situé sur un même axe de symétrie I-I de la grappe 8. Celle-ci comporte encore deux ailettes 24, 25 venues de forme avec les languettes 21 et pliées à angle droit par rapport à celles-ci. Ces ailettes sont ainsi disposées sur le second axe de symétrie II-II de la grappe 8.The cluster arrangement of the four elementary inserts 10 is made along two perpendicular axes of symmetry I-I, II-II. The axes XX of each insert 10 are two by two concurrent at a point 28, 29 located on the same axis of symmetry II of the cluster 8. The latter also comprises two fins 24, 25 formed with the tongues 21 and folded at right angles to them. These fins are thus arranged on the second axis of symmetry II-II of the cluster 8.

On va maintenant décrire, en référence aux figures 8 à 8b, l'implantation d'une grappe d'inserts 8 dans un moule de culasse. La partie inférieure 26 de cette culasse est obtenue au moyen d'une plaque métallique 27 disposée dans le moule qui porte des noyaux, également métalliques, permettant l'ébauche du logement des soupapes et de la préchambre de combustion. C'est ainsi que, sur la figure 8, l'ébauche du logement des soupapes d'admission est obtenue au moyen des noyaux 31, 32, celui de la soupape d'échappement par le noyau 33 tandis que le noyau 34 permet l'ébauche de la préchambre.We will now describe, with reference to Figures 8 to 8b, the implementation of a cluster of inserts 8 in a cylinder head mold. The lower part 26 of this cylinder head is obtained by means of a metallic plate 27 placed in the mold which carries cores, also metallic, allowing the roughing of the housing of the valves and of the precombustion chamber. Thus, in Figure 8, the blank of the intake valve housing is obtained by means of the cores 31, 32, that of the exhaust valve by the core 33 while the core 34 allows the draft of the prechamber.

La grappe d'inserts 8 est placée sur le fond de la plaque 27 de façon que son axe de symétrie I-I soit perpendiculaire aux axes 43, 44 des noyaux, respectivement, 33 et 34 et que son axe de symétrie II-II soit perpendiculaire aux axes 41, 42, respectivement, des noyaux 31 et 32. De la sorte, les languettes 21 sont tangentes à ces derniers noyaux de façon que les ailettes 24, 25 qu'elles portent se trouvent engagées dans des logements 35, 36 pratiqués longitudinalement sur la paroi externe desdits noyaux, pour assuret le positionnement de la grappe et son maintien en rotation dans le plan de la plaque 27.The cluster of inserts 8 is placed on the bottom of the plate 27 so that its axis of symmetry II is perpendicular to the axes 43, 44 of the cores, respectively, 33 and 34 and that its axis of symmetry II-II is perpendicular to the axes 41, 42, respectively, of the cores 31 and 32. In this way, the tongues 21 are tangent to the latter cores so that the fins 24, 25 which they carry are engaged in housings 35, 36 made longitudinally on the outer wall of said cores, to ensure the positioning of the cluster and its keeping in rotation in the plane of the plate 27.

Comme on le voit sur les coupes des figures 8a et 8b, des broches métalliques coiffent les noyaux 31-33 pour former les conduits d'admission (broches 37 et 38) et d'échappement (broche 39). Ainsi les broches 37 et 38 qui coiffent les noyaux portant les logements des ailettes 24 et 25 assurent le maintien de la grappe dans le plan vertical. La grappe 8 est donc parfaitement maintenue dans tous les plans durant la coulée.As seen in the sections of Figures 8a and 8b, metal pins cover the cores 31-33 to form the intake (pins 37 and 38) and exhaust (pin 39) conduits. Thus the pins 37 and 38 which cover the cores carrying the housings of the fins 24 and 25 ensure the maintenance of the cluster in the vertical plane. The cluster 8 is therefore perfectly maintained in all planes during casting.

On voit encore, sur les figures précitées, le noyau 40 servant à former le circuit de refroidissement de la culasse, celui-ci ne sera pas décrit plus longuement, en effet, il ne participe pas à l'invention.We also see in the above figures, the core 40 used to form the cylinder head cooling circuit, it will not be described in more detail, in fact, it does not participate in the invention.

Lorsque la grappe est mise en place, les inserts élémentaires 10 sont insérés entre les noyaux de façon que leurs zones fonctionnelles formées par les évasements 16, 17 des collets 15 recouvrent les orientations de dilatation en arc de cercle telles que définies sur la figure 1.When the cluster is put in place, the elementary inserts 10 are inserted between the cores so that their functional zones formed by the flares 16, 17 of the collars 15 cover the expansion orientations in an arc of a circle as defined in FIG. 1.

Lors de l'usinage du logement des sièges de soupape et de la chambre de combustion, les parties de chacun des inserts élémentaires hors de la zone fonctionnelle sont enlevés par l'outil ainsi que les éléments de liaison de la grappe et seuls subsistent les évasements 16 et 17 formant joints d'expansion (figure 6).When machining the valve seat housing and the combustion chamber, the parts of each of the elementary inserts outside the functional area are removed by the tool as well as the connecting elements of the cluster and only the flares remain. 16 and 17 forming expansion joints (Figure 6).

Les figures 5 et 7 illustrent une variante de réalisation de la grappe d'inserts qui peut être utilisé lorsqu'un seul joint d'expansion est nécessaire par zone sensible, comme représenté sur la figure 2. Dans ce cas, chaque insert élémentaire 110 comporte un corps 114 semi-cylindrique raccordé à un collet 115 formant un seul évasement 116 en forme d'angle saillant. Chacun des inserts est relié aux deux inserts adjacents par une cloison 120, 121 venue de forme avec le corps 114 et/ou le collet 115. Les ailettes 124, 125 de positionnement de la grappe sont portées par le deux cloisons 121 en vis-à-vis. La mise en place d'un tel insert dans le moule de la culasse est identique à celle que l'on vient de décrire.Figures 5 and 7 illustrate an alternative embodiment of the cluster of inserts which can be used when only one expansion joint is required per sensitive area, as shown in Figure 2. In this case, each elementary insert 110 comprises a semi-cylindrical body 114 connected to a collar 115 forming a single flare 116 in the form of a projecting angle. Each of the inserts is connected to the two adjacent inserts by a partition 120, 121 formed in shape with the body 114 and / or the collar 115. The fins 124, 125 for positioning the cluster are carried by the two partitions 121 facing each other. The installation of such an insert in the cylinder head mold is identical to that which has just been described.

La grappe d'inserts selon l'invention est d'une manipulation aisée, elle peut être effectuée aussi bien manuellement qu'automatiquement. Grâce à ses moyens d'indexation et de maintien en place, elle permet de réduire le temps de l'opération tout en assurant une plus grande sécurité de positionnement.The cluster of inserts according to the invention is easy to handle, it can be carried out both manually and automatically. Thanks to its means of indexing and holding in place, it makes it possible to reduce the time of the operation while ensuring greater security of positioning.

Bien entendu, les exemples de réalisation que l'on vient de décrire ne sont pas limitatifs, en particulier en ce qui concerne le nombre des inserts d'une même grappe et leur forme. Il n'est pas nécessaire, non plus, que tous les inserts d'une même grappe soient identiques ni qu'ils soient disposés de façon symétrique.Of course, the exemplary embodiments which have just been described are not limiting, in particular as regards the number of inserts of the same cluster and their shape. Nor is it necessary for all the inserts of the same cluster to be identical or for them to be arranged symmetrically.

Claims (6)

1- Agencement d'inserts métalliques (10, 110), composés d'un corps (14, 114) raccordé à un bord plié formant collet (15, 115), disposés avant la coulée, pour former au moins un joint d'expansion, dans une culasse de moteur à combustion interne comportant plus de deux canaux (1-4) par cylindre, séparés par des zones soumises à des contraintes thermiques,
caractérisé en ce que qu'il consiste à relier ces inserts entre eux par des languettes ou cloisons (20, 120), (21, 121) venues de forme avec lesdits inserts pour former une grappe (8) disposée et maintenue dans le moule de la culasse de façon que chacun des inserts élémentaires (10, 110) se trouve implanté, après la coulée, dans l'une des zones de contrainte située entre deux canaux (1-4) adjacents. 1- Arrangement of metal inserts (10, 110), composed of a body (14, 114) connected to a folded edge forming a collar (15, 115), arranged before casting, to form at least one expansion joint , in an internal combustion engine cylinder head comprising more than two channels (1-4) per cylinder, separated by zones subjected to thermal stresses,
characterized in that it consists in connecting these inserts to each other by tabs or partitions (20, 120), (21, 121) which have come into shape with said inserts to form a cluster (8) arranged and maintained in the mold the cylinder head so that each of the elementary inserts (10, 110) is located, after casting, in one of the stress zones located between two adjacent channels (1-4). 2 - Agencement d'inserts métalliques selon la revendication 1,
caractérisé en ce que chacune des languettes ou cloisons de liaison (20, 120), (21, 121) est engagée dans le moule au contact d'un des noyaux (31-34) destinés à former les canaux (1-4) de la culasse. 2 - Arrangement of metal inserts according to claim 1,
characterized in that each of the connecting tabs or partitions (20, 120), (21, 121) is engaged in the mold in contact with one of the cores (31-34) intended to form the channels (1-4) of the breech. 3 - Agencement d'inserts métalliques selon la revendication 2,
caractérisé en ce que au moins une languette ou cloison (21, 121) porte une ailette de positionnement (24), (25) coopérant avec un logement (35) (36) pratiqué dans le noyau (31), (32) avec lequel ladite languette ou cloison est en contact. 3 - Arrangement of metal inserts according to claim 2,
characterized in that at least one tongue or partition (21, 121) carries a positioning fin (24), (25) cooperating with a housing (35) (36) formed in the core (31), (32) with which said tongue or partition is in contact. 4 - Agencement d'inserts métalliques selon l'une des revendications précédentes,
caractérisé en ce que chaque insert (10) comporte deux parties actives (16), (17) formant joint d'expansion, diamétralement opposées et constituées par deux évasements, en forme d'angle saillant, de son collet (15). 4 - Arrangement of metal inserts according to one of the preceding claims,
characterized in that each insert (10) comprises two active parts (16), (17) forming an expansion joint, diametrically opposite and constituted by two flares, in the form of a projecting angle, from its collar (15). 5 - Agencement d'inserts métalliques selon la revendication 4,
caractérisé en ce que la grappe d'inserts (8) est formée de quatre inserts élémentaires (10) et en ce que les axes (XX) réunissant les sommets (16s) (17s) des évasements (16), (17) concourent deux à deux en un point (28), (29) situé sur un axe de symétrie (I-I) de ladite grappe. 5 - Arrangement of metal inserts according to claim 4,
characterized in that the cluster of inserts (8) is formed by four elementary inserts (10) and in that the axes (XX) joining the tops (16s) (17s) of the flares (16), (17) combine two two at a point (28), (29) located on an axis of symmetry (II) of said cluster. 6 - Culasse de moteur à combustion interne, notamment diesel, équipée, à la coulée, de grappes d'inserts (8) conformes à l'une des revendications précédentes. 6 - Cylinder head of internal combustion engine, in particular diesel, fitted, when pouring, with clusters of inserts (8) according to one of the preceding claims.
EP93402449A 1992-10-28 1993-10-06 Fitting of metallic inserts for expansion joint in cylinderhead of an internal combustion engine Expired - Lifetime EP0595676B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9212838 1992-10-28
FR9212838A FR2697291B1 (en) 1992-10-28 1992-10-28 Arrangement of metal inserts for cylinder head expansion joints of an internal combustion engine.

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EP0595676A1 true EP0595676A1 (en) 1994-05-04
EP0595676B1 EP0595676B1 (en) 1996-07-24

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EP93402449A Expired - Lifetime EP0595676B1 (en) 1992-10-28 1993-10-06 Fitting of metallic inserts for expansion joint in cylinderhead of an internal combustion engine

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DE (1) DE69303800T2 (en)
FR (1) FR2697291B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0658690A1 (en) * 1993-12-16 1995-06-21 Saab Automobile Aktiebolag Reinforced cylinder head
FR2736967A1 (en) * 1995-07-18 1997-01-24 Renault Housing area for valve seats in IC engine cylinder head - has thin section metal insert fitted into landing area, between adjacent valve seat housings, with insert embedded into cylinder head during casting process
US6874479B2 (en) 2003-03-21 2005-04-05 Avl List Gmbh Internal combustion engine
WO2008009834A1 (en) * 2006-07-18 2008-01-24 Renault S.A.S. Internal combustion engine cylinder head comprising a reinforcing element

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GB2019758A (en) * 1978-04-19 1979-11-07 Maschf Augsburg Nuernberg Ag Making a composite cylinder head
JPS5874265A (en) * 1981-10-29 1983-05-04 Honda Motor Co Ltd Production of cylinder head for engine
EP0484197A1 (en) * 1990-10-30 1992-05-06 Automobiles Peugeot Cylinder head of an internal combustion engine with cast metallic insert

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FR2706795A1 (en) * 1993-06-22 1994-12-30 Curti Jean Device for separating moulded components injected as a cluster
SE9500260L (en) * 1994-02-11 1995-08-12 Fischer Georg Giessereianlagen Process and apparatus for cleaning of cast trees

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GB2019758A (en) * 1978-04-19 1979-11-07 Maschf Augsburg Nuernberg Ag Making a composite cylinder head
JPS5874265A (en) * 1981-10-29 1983-05-04 Honda Motor Co Ltd Production of cylinder head for engine
EP0484197A1 (en) * 1990-10-30 1992-05-06 Automobiles Peugeot Cylinder head of an internal combustion engine with cast metallic insert

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PATENT ABSTRACTS OF JAPAN vol. 7, no. 169 (M - 231)<1314> 26 July 1983 (1983-07-26) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0658690A1 (en) * 1993-12-16 1995-06-21 Saab Automobile Aktiebolag Reinforced cylinder head
US5463989A (en) * 1993-12-16 1995-11-07 Saab Automobile Aktiebolag Reinforced cylinder head
FR2736967A1 (en) * 1995-07-18 1997-01-24 Renault Housing area for valve seats in IC engine cylinder head - has thin section metal insert fitted into landing area, between adjacent valve seat housings, with insert embedded into cylinder head during casting process
US6874479B2 (en) 2003-03-21 2005-04-05 Avl List Gmbh Internal combustion engine
WO2008009834A1 (en) * 2006-07-18 2008-01-24 Renault S.A.S. Internal combustion engine cylinder head comprising a reinforcing element
FR2904052A1 (en) * 2006-07-18 2008-01-25 Renault Sas CYLINDER HEAD FOR INTERNAL COMBUSTION ENGINE, COMPRISING A REINFORCING ELEMENT.

Also Published As

Publication number Publication date
DE69303800D1 (en) 1996-08-29
FR2697291A1 (en) 1994-04-29
EP0595676B1 (en) 1996-07-24
DE69303800T2 (en) 1996-11-28
FR2697291B1 (en) 1994-12-02

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