FR2736968A1 - Housing area for valve seats in IC engine cylinder head - has thermal screen fitted over landing area between adjacent valve seat housings, with screen held in place by side panels, fitting between valve seat housings - Google Patents

Housing area for valve seats in IC engine cylinder head - has thermal screen fitted over landing area between adjacent valve seat housings, with screen held in place by side panels, fitting between valve seat housings Download PDF

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Publication number
FR2736968A1
FR2736968A1 FR9508649A FR9508649A FR2736968A1 FR 2736968 A1 FR2736968 A1 FR 2736968A1 FR 9508649 A FR9508649 A FR 9508649A FR 9508649 A FR9508649 A FR 9508649A FR 2736968 A1 FR2736968 A1 FR 2736968A1
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FR
France
Prior art keywords
cylinder head
heat shield
housings
valve seat
head according
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
FR9508649A
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French (fr)
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FR2736968B1 (en
Inventor
Christophe Depoid
Waldemar Zawisza
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Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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Application filed by Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Priority to FR9508649A priority Critical patent/FR2736968B1/en
Publication of FR2736968A1 publication Critical patent/FR2736968A1/en
Application granted granted Critical
Publication of FR2736968B1 publication Critical patent/FR2736968B1/en
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Classifications

    • 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
    • F02F1/26—Cylinder heads having cooling means
    • F02F1/36—Cylinder heads having cooling means for liquid cooling
    • F02F1/38—Cylinder heads having cooling means for liquid cooling the cylinder heads being of overhead valve type
    • 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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
    • 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
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/247—Arrangement of valve stems in cylinder heads the valve stems being orientated in parallel with the cylinder axis
    • 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

Abstract

The cylinder head (20) is constructed with a combustion face (18), which forms the boundary of the combustion chamber (16) of the engine. This combustion surface has at, least, two holes (24), which open into the combustion chamber and which are separated by a landing area (32). The openings are formed as housings for the cylindrical housings (30), which are located to receive the valve seats. A thermal screen (34) is fitted into the landing area, between the valve seat housings. The screen is formed with a central area (36), which is produced in a refractory material and is located directly over the landing area and is so located so as to be flush with the surface of the combustion face of the cylinder head. The thermal screen has two side panels (38), which lock the screen in position between the valve seat housings.

Description

L'invention concerne une culasse de moteur à combustion interne. The invention relates to an internal combustion engine cylinder head.

L'invention concerne plus particulièrement une culasse de moteur à combustion interne, notamment pour véhicule automobile, dont une face feu ferme une chambre de combustion d'un cylindre du moteur et du type comportant au moins deux orifices qui débouchent dans la chambre de combustion et qui sont séparés par un pontet. The invention relates more particularly to an internal combustion engine cylinder head, in particular for a motor vehicle, one fire face of which closes a combustion chamber of an engine cylinder and of the type comprising at least two orifices which open into the combustion chamber and which are separated by a trigger guard.

Le pontet, qui est agencé par exemple entre deux sièges de soupape ou entre un siège de soupape et l'orifice débouchant d'une préchambre de combustion, est agencé dans la zone de la culasse soumise aux plus hautes températures. The trigger guard, which is arranged for example between two valve seats or between a valve seat and the orifice emerging from a combustion prechamber, is arranged in the region of the cylinder head subjected to the highest temperatures.

Ce pontet est de plus soumis à de fréquents cycles thermiques d'échauffement et de refroidissement, non seulement à la mise en marche et à l'arrêt du moteur, mais également à chaque cycle de fonctionnement du moteur. This trigger guard is also subjected to frequent thermal heating and cooling cycles, not only when the engine is started and stopped, but also during each engine operating cycle.

En effet, lors de la phase d'admission, le pontet a tendance à être refroidi par les gaz d'admission qui sont sensiblement à la température ambiante tandis que, lors de la phase d'échappement, le pontet est au contact des gaz brûlés qui sont encore à très haute température. Indeed, during the intake phase, the trigger guard tends to be cooled by the intake gases which are substantially at room temperature while, during the exhaust phase, the trigger guard is in contact with the burnt gases. which are still at a very high temperature.

II en résulte que le pontet subit des dilatations et des contractions successives qui, associées à un phénomène de fluage aux plus hautes températures, peuvent entraîner l'apparition de fissures de la zone environnante de la culasse qui en font une zone particulièrement fragile. As a result, the trigger guard undergoes successive expansions and contractions which, associated with a phenomenon of creep at the highest temperatures, can lead to the appearance of cracks in the surrounding area of the cylinder head which make it a particularly fragile area.

Dans le but de renforcer la tenue en température du pontet, I'invention propose une culasse du type vu précédemment, caractérisée en ce qu'un écran thermique est rapporté sur la face feu de la culasse, devant le pontet séparant les deux orifices. In order to reinforce the temperature resistance of the trigger guard, the invention proposes a cylinder head of the type seen above, characterized in that a heat shield is attached to the fire face of the cylinder head, in front of the trigger guard separating the two orifices.

Selon d'autres caractéristiques de l'invention
- L'écran thermique comporte une portion centrale en matériau réfractaire, agencée devant le pontet
- la portion centrale de l'écran thermique est affleurante dans la face feu de la culasse;
- les deux orifices sont deux logements qui reçoivent des sièges de soupape rapportés montés en force, et l'écran thermique comporte deux flancs de fixation serrés entre les sièges de soupape et leurs logements
- les flancs de fixation sont reçus au moins partiellement dans des dégagements formés dans les parois des logements
- la culasse est réalisée par moulage, et l'écran thermique comporte au moins une patte de fixation qui est noyée dans la culasse;;
- L'écran thermique comporte deux pattes de fixation qui comportent chacune une première branche qui est reliée à la portion centrale, qui s'étend dans la culasse perpendiculairement au plan de la face feu et qui se prolonge par une seconde branche qui s'étend dans la culasse sensiblement parallèlement à la face feu
- la portion centrale de l'écran thermique est munie, à l'origine, d'une surépaisseur qui est usinée lors du surfaçage de la face feu de la culasse;
- L'écran thermique est réalisé par déformation d'un flan de tôle en acier réfractaire
- L'écran thermique est réalisé en matériau fritté.According to other features of the invention
- The heat shield has a central portion made of refractory material, arranged in front of the trigger guard
- The central portion of the heat shield is flush with the fire face of the cylinder head;
- the two orifices are two housings which receive valve seats fitted in a forced manner, and the heat shield has two fixing sides tightened between the valve seats and their housings
- the fixing flanks are received at least partially in clearances formed in the walls of the housings
- The cylinder head is produced by molding, and the heat shield comprises at least one fixing lug which is embedded in the cylinder head;
- The heat shield has two fixing lugs which each have a first branch which is connected to the central portion, which extends in the cylinder head perpendicular to the plane of the fire face and which is extended by a second branch which extends in the cylinder head substantially parallel to the fire face
- The central portion of the heat shield is originally provided with an extra thickness which is machined during surfacing of the fire face of the cylinder head;
- The heat shield is produced by deformation of a sheet of refractory steel sheet
- The heat shield is made of sintered material.

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui suit pour la compréhension de laquelle on se reportera aux dessins annexés dans lesquels
- la figure 1 est une vue schématique partielle en coupe d'un moteur à combustion interne
- la figure 2 est une vue de la face feu d'une culasse réalisée conformément aux enseignements de l'invention;
- la figure 3 est une vue en coupe selon la ligne 3-3 de la figure 2
- la figure 4 est une vue de la face feu d'une variante de réalisation d'une culasse selon l'invention;
- la figure 5 est une vue en coupe selon la ligne 5-5 de la figure 4 ;
- la figure 6 est une vue similaire à celle de la figure 5 représentant une autre variante de réalisation de l'invention.Other characteristics and advantages of the invention will appear on reading the following detailed description for the understanding of which reference will be made to the accompanying drawings in which
- Figure 1 is a partial schematic sectional view of an internal combustion engine
- Figure 2 is a view of the fire face of a cylinder head made in accordance with the teachings of the invention;
- Figure 3 is a sectional view along line 3-3 of Figure 2
- Figure 4 is a view of the fire face of an alternative embodiment of a cylinder head according to the invention;
- Figure 5 is a sectional view along line 5-5 of Figure 4;
- Figure 6 is a view similar to that of Figure 5 showing another alternative embodiment of the invention.

On a représenté de manière schématique sur la figure 1 un moteur à combustion interne 10 dans lequel un piston 12 se déplace à l'intérieur d'un cylindre 14 dont l'extrémité supérieure, délimitant une chambre de combustion 16, est fermée par la face feu 18 d'une culasse 20. FIG. 1 schematically shows an internal combustion engine 10 in which a piston 12 moves inside a cylinder 14 whose upper end, delimiting a combustion chamber 16, is closed by the face fire 18 of a cylinder head 20.

Un conduit 22 est aménagé dans la culasse 20 et il débouche dans la chambre de combustion 16 au travers d'un orifice 24 susceptible d'être obturé par une soupape 26 prenant appui contre un siège de soupape 28. A duct 22 is fitted in the cylinder head 20 and it opens into the combustion chamber 16 through an orifice 24 capable of being closed by a valve 26 bearing against a valve seat 28.

On a représenté sur la figure 2 un détail de la face feu 18 de la culasse 20 qui ferme la chambre de combustion 16 et qui est munie de deux orifices 24 dont l'un est destiné à l'admission du mélange air-carburant et dont l'autre est destiné à l'échappement des gaz brûlés. FIG. 2 shows a detail of the fire face 18 of the cylinder head 20 which closes the combustion chamber 16 and which is provided with two orifices 24, one of which is intended for the admission of the air-fuel mixture and of which the other is for the exhaust of burnt gases.

Comme on peut le voir plus particulièrement sur la figure 3, les sièges de soupape 28 de chacun des orifices 24 sont rapportés dans des logements cylindriques aménagés dans la face feu 18 de la culasse 20. As can be seen more particularly in FIG. 3, the valve seats 28 of each of the orifices 24 are attached in cylindrical housings arranged in the fire face 18 of the cylinder head 20.

Les deux sièges de soupape 28 délimitent entre eux un pontet 32 qui est muni d'un écran thermique 34 conforme aux enseignements de l'invention.  The two valve seats 28 delimit between them a trigger guard 32 which is provided with a heat shield 34 in accordance with the teachings of the invention.

L'écran thermique 34 comporte une portion centrale 36 sensiblement plane qui est agencée dans la face feu 18 de la culasse 20, devant la zone la plus étroite du pontet 32. The heat shield 34 has a substantially flat central portion 36 which is arranged in the fire face 18 of the cylinder head 20, in front of the narrowest region of the trigger guard 32.

Comme on peut le voir sur la figure 3, L'écran thermique 34 comporte à chacun de ses bords 37 adjacents aux sièges de soupapes 28 des flancs 38 qui s'étendent perpendiculairement à la face feu en direction de l'intérieur de la culasse 20 et qui sont serrés radialement chacun entre un siège de soupape 28 et son logement associés 30. As can be seen in Figure 3, the heat shield 34 has at each of its edges 37 adjacent to the valve seats 28 of the sides 38 which extend perpendicular to the fire face towards the interior of the cylinder head 20 and which are each clamped radially between a valve seat 28 and its associated housing 30.

Afin de limiter la force de serrage des flancs 38, ils sont chacun reçu dans un dégagement 40 correspondant agencé dans une paroi latérale cylindrique 42 d'un logement 30 d'un siège de soupape 28. In order to limit the clamping force of the sidewalls 38, they are each received in a corresponding recess 40 arranged in a cylindrical side wall 42 of a housing 30 of a valve seat 28.

Les dégagements 40 peuvent être réalisés soit au moulage de la culasse 20, soit au moment de l'usinage des logements 30 des sièges de soupape 28. The clearances 40 can be made either by molding the cylinder head 20, or during the machining of the housings 30 of the valve seats 28.

De la même manière, la portion centrale 36 de l'écran thermique 34 est reçue dans un évidement 44 formé dans le pontet 32 de manière que l'écran thermique 34 ne forme pas une protubérance dans la face feu 18. Likewise, the central portion 36 of the heat shield 34 is received in a recess 44 formed in the bridge 32 so that the heat shield 34 does not form a protuberance in the fire face 18.

L'écran thermique 34 peut être réalisé par déformation d'un flan de tôle en acier réfractaire ou peut être obtenu par moulage et être alors réalisé en matériau fritté, par exemple en céramique. The heat shield 34 can be produced by deformation of a sheet of refractory steel sheet or can be obtained by molding and can then be made of sintered material, for example ceramic.

L'écran thermique 34 qui est représenté sur les figures 2 et 3 est ainsi facile à installer sur la culasse 20 puisqu'il n'est pas nécessaire de prévoir des moyens spécifiques pour sa fixation, cette fonction étant assurée par les sièges de soupape 28 qui sont engagés à force dans leusr logements 30. The heat shield 34 which is shown in Figures 2 and 3 is thus easy to install on the cylinder head 20 since it is not necessary to provide specific means for its fixing, this function being provided by the valve seats 28 who are forcibly engaged in leusr housing 30.

La présence de l'écran thermique 34 permet, au cours du fonctionnement du moteur, de limiter la température atteinte par le pontet, mais aussi de limiter la variation de cette température entre les différentes phases de fonctionnement du moteur. The presence of the thermal screen 34 makes it possible, during engine operation, to limit the temperature reached by the trigger guard, but also to limit the variation of this temperature between the different engine operating phases.

La conjonction de ces deux facteurs permet de limiter fortement l'apparition de fissures dans le pontet et accroît ainsi la longévité de la culasse. The combination of these two factors greatly limits the appearance of cracks in the trigger guard and thus increases the longevity of the cylinder head.

On a représenté sur les figures 4 et 5 une variante de réalisation de l'invention dans laquelle l'écran thermique 34 est réalisé sous la forme d'un insert noyé par surmoulage dans le pontet 32. FIGS. 4 and 5 show an alternative embodiment of the invention in which the heat shield 34 is produced in the form of an insert embedded by overmolding in the trigger guard 32.

A cet effet, L'écran thermique 34 possède deux pattes de fixation 48 qui sont agencées à chacun des deux bords 46 de la portion centrale 36 dont la direction est sensiblement parallèle à la direction X-X qui joint les axes des conduits 22. To this end, the heat shield 34 has two fixing lugs 48 which are arranged at each of the two edges 46 of the central portion 36 whose direction is substantially parallel to the direction X-X which joins the axes of the conduits 22.

Chacune des pattes de fixation 48 comporte une première branche 50 qui s'étend perpendiculairement depuis la portion centrale 36 en direction de l'intérieur de la culasse 20 et se prolonge à son extrémité par une seconde branche 52 qui s'étend sensiblement dans le plan général de la culasse 20, selon une direction sensiblement perpendiculaire à la direction X-X qui joint les axes des orifices 22. Each of the fixing lugs 48 has a first branch 50 which extends perpendicularly from the central portion 36 towards the interior of the cylinder head 20 and is extended at its end by a second branch 52 which extends substantially in the plane general of the cylinder head 20, in a direction substantially perpendicular to the direction XX which joins the axes of the orifices 22.

Les branches 50, 52 des pattes 48 sont ainsi noyées dans le pontet 32 et assurent la fixation de la portion centrale affleurante 36 de l'écran thermique 34. The branches 50, 52 of the legs 48 are thus embedded in the trigger guard 32 and ensure the fixing of the flush central portion 36 of the heat shield 34.

Une particularité de ce mode de fixation est qu'il permet en outre de diminuer les contraintes de compression du pontet 32 dues à la dilatation du pontet 32 lors de son échauffement. A particularity of this method of attachment is that it also makes it possible to reduce the compression stresses of the trigger guard 32 due to the expansion of the trigger guard 32 during its heating.

En effet, les branches 50, 52 des pattes 48 jouent en quelque sorte le rôle de joints de dilatation car, du fait d'une mauvaise liaison métallurgique entre le matériau de l'insert et l'aluminium de la culasse, il se produit, au refroidissement de la culasse, un décollement entre les pattes de fixation 48 et la culasse 20 qui, au cycle suivant d'échauffement, permet une dilatation de l'aluminium de la culasse 20 sans provoquer de déformation plastique locale du matériau dans le pontet 32. Indeed, the branches 50, 52 of the lugs 48 somehow play the role of expansion joints because, due to a poor metallurgical connection between the material of the insert and the aluminum of the cylinder head, it occurs, upon cooling of the cylinder head, detachment between the fixing lugs 48 and the cylinder head 20 which, on the next heating cycle, allows the aluminum of the cylinder head 20 to expand without causing local plastic deformation of the material in the bridge 32 .

Dans ce mode de réalisation, il faut prévoir une épaisseur d'origine suffisante de la portion centrale 36 de l'écran thermique 34 de manière à former une surépaisseur d'usinage pour le surfaçage de la face feu 18 de la culasse 20. In this embodiment, it is necessary to provide a sufficient original thickness of the central portion 36 of the heat shield 34 so as to form a machining allowance for facing the fire face 18 of the cylinder head 20.

On a représenté sur la figure 6 une variante de réalisation d'un écran thermique 34 réalisé sous la forme d'un insert dans lequel la portion centrale 36 de l'écran thermique 34 n'est pas plane mais présente la forme d'une cuvette. FIG. 6 shows an alternative embodiment of a heat shield 34 produced in the form of an insert in which the central portion 36 of the heat shield 34 is not planar but has the shape of a bowl. .

Ce mode de réalisation montre que l'adjonction d'un écran thermique 34 peut être réalisée même dans le cas où la face feu 18 de la culasse 20 présente des formes particulières destinées à améliorer la combustion du mélange carburant dans la chambre de combustion 16. This embodiment shows that the addition of a heat shield 34 can be carried out even in the case where the fire face 18 of the cylinder head 20 has particular shapes intended to improve the combustion of the fuel mixture in the combustion chamber 16.

L'invention a été ici décrite dans le cas d'un pontet agencé entre deux sièges de soupape mais on peut prévoir d'utiliser un écran thermique selon l'invention pour améliorer la tenue en température d'un pontet reliant un siège de soupape à l'orifice débouchant d'une préchambre de combustion.  The invention has been described here in the case of a trigger guard arranged between two valve seats, but provision can be made to use a heat shield according to the invention to improve the temperature resistance of a trigger guard connecting a valve seat to the orifice emerging from a combustion prechamber.

Claims (10)

REVENDICATIONS 1. Culasse de moteur à combustion interne, notamment pour véhicule automobile, dont une face feu (18) ferme une chambre de combustion (16) d'un cylindre (14) du moteur (10) et du type comportant au moins deux orifices (24) qui débouchent dans la chambre de combustion (16) et qui sont séparés par un pontet (32), caractérisée en ce qu'un écran thermique (34) est rapporté sur la face feu (18) de la culasse (20), devant le pontet (32) séparant les deux orifices (22). 1. Cylinder head of an internal combustion engine, in particular for a motor vehicle, one fire face (18) of which closes a combustion chamber (16) of a cylinder (14) of the engine (10) and of the type comprising at least two orifices ( 24) which open into the combustion chamber (16) and which are separated by a trigger guard (32), characterized in that a heat shield (34) is attached to the fire face (18) of the cylinder head (20), in front of the trigger guard (32) separating the two orifices (22). 2. Culasse selon la revendication 1, caractérisée en ce que l'écran thermique (34) comporte une portion centrale (36) en matériau réfractaire, agencée devant le pontet (32). 2. Cylinder head according to claim 1, characterized in that the heat shield (34) comprises a central portion (36) of refractory material, arranged in front of the trigger guard (32). 3. Culasse selon la revendication 2, caractérisée en ce que la portion centrale (36) de l'écran thermique (34) est affleurante dans la face feu (18) de la culasse (20). 3. Cylinder head according to claim 2, characterized in that the central portion (36) of the heat shield (34) is flush in the fire face (18) of the cylinder head (20). 4. Culasse selon la revendication 3, caractérisée en ce que les deux orifices (24) sont deux logements (30) qui reçoivent des sièges de soupape rapportés (28) montés à force, et en ce que l'écran thermique (32) comporte deux flancs (38) de fixation serrés entre les sièges de soupape (28) et leurs logements (30). 4. Cylinder head according to claim 3, characterized in that the two orifices (24) are two housings (30) which receive attached valve seats (28) force-fitted, and in that the heat shield (32) comprises two fixing sides (38) tightened between the valve seats (28) and their housings (30). 5. Culasse selon la revendication 4, caractérisée en ce que les flancs (28) de fixation sont reçus au moins partiellement dans des dégagements (42) formés dans les parois (42) des logements (30). 5. Cylinder head according to claim 4, characterized in that the flanks (28) for fixing are received at least partially in recesses (42) formed in the walls (42) of the housings (30). 6. Culasse selon l'une quelconque des revendications 1 à 3, caractérisée en ce que la culasse (20) est réalisée par moulage, et en ce que l'écran thermique (32) comporte au moins une patte de fixation (48) qui est noyée dans la culasse (20). 6. Cylinder head according to any one of claims 1 to 3, characterized in that the cylinder head (20) is produced by molding, and in that the heat shield (32) comprises at least one fixing lug (48) which is embedded in the cylinder head (20). 7. Culasse selon la revendication 6, caractérisée en ce que l'écran thermique (34) comporte deux pattes de fixation (48) qui comportent chacune une première branche (50) qui est reliée à la portion centrale (36), qui s'étend dans la culasse (20) perpendiculairement au plan de la face feu (18) et qui se prolonge par une seconde branche (52) qui s'étend dans la culasse (20) sensiblement parallèlement à la face feu (18). 7. Cylinder head according to claim 6, characterized in that the heat shield (34) comprises two fixing lugs (48) which each have a first branch (50) which is connected to the central portion (36), which s extends into the cylinder head (20) perpendicular to the plane of the fire face (18) and which is extended by a second branch (52) which extends into the cylinder head (20) substantially parallel to the fire face (18). 8. Culasse selon l'une des revendications 6 ou 7, caractérisée en ce que la portion centrale (36) de l'écran thermique (34) est munie, à l'origine, d'une surépaisseur qui est usinée lors du surfaçage de la face feu (18) de la culasse (20). 8. Cylinder head according to one of claims 6 or 7, characterized in that the central portion (36) of the heat shield (34) is originally provided with an extra thickness which is machined during the surfacing of the fire face (18) of the cylinder head (20). 9. Culasse selon l'une quelconque des revendications précédentes, caractérisée en ce que l'écran thermique (34) est réalisé par déformation d'un flan de tôle en acier réfractaire. 9. Cylinder head according to any one of the preceding claims, characterized in that the heat shield (34) is produced by deformation of a sheet blank of refractory steel. 10. Culasse selon l'une quelconque des revendications 1 à 7, caractérisée en ce que l'écran thermique (34) est réalisé en matériau fritté.  10. Cylinder head according to any one of claims 1 to 7, characterized in that the heat shield (34) is made of sintered material.
FR9508649A 1995-07-18 1995-07-18 CYLINDER HEAD OF INTERNAL COMBUSTION ENGINE PROVIDED WITH A THERMAL SHIELD OF PONTET Expired - Fee Related FR2736968B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9508649A FR2736968B1 (en) 1995-07-18 1995-07-18 CYLINDER HEAD OF INTERNAL COMBUSTION ENGINE PROVIDED WITH A THERMAL SHIELD OF PONTET

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9508649A FR2736968B1 (en) 1995-07-18 1995-07-18 CYLINDER HEAD OF INTERNAL COMBUSTION ENGINE PROVIDED WITH A THERMAL SHIELD OF PONTET

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Publication Number Publication Date
FR2736968A1 true FR2736968A1 (en) 1997-01-24
FR2736968B1 FR2736968B1 (en) 1997-08-29

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FR9508649A Expired - Fee Related FR2736968B1 (en) 1995-07-18 1995-07-18 CYLINDER HEAD OF INTERNAL COMBUSTION ENGINE PROVIDED WITH A THERMAL SHIELD OF PONTET

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017082846A1 (en) 2015-11-11 2017-05-18 Ford Otomotiv Sanayi A. S. Multi-piece cylinder head

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2937216A1 (en) * 1979-09-14 1981-04-02 Klöckner-Humboldt-Deutz AG, 5000 Köln Light metal cylinder head for air cooled IC engine - has ceramic insert cast into domed base of head in zone exposed to max temps.
US4290396A (en) * 1978-04-19 1981-09-22 Maschinenfabrik Augsburg-Nuremberg Aktiengesellchaft Heat conducting shield for cylinder heads of internal combustion engines
EP0462850A1 (en) * 1990-06-19 1991-12-27 Automobiles Peugeot Method of making aluminium alloy castings containing an insert and cylinder head of internal combustion engine obtained thereby
EP0484197A1 (en) * 1990-10-30 1992-05-06 Automobiles Peugeot Cylinder head of an internal combustion engine with cast metallic insert
US5295462A (en) * 1992-10-16 1994-03-22 Cummins Engine Co., Inc. Coin insert for the firing deck in an internal combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4290396A (en) * 1978-04-19 1981-09-22 Maschinenfabrik Augsburg-Nuremberg Aktiengesellchaft Heat conducting shield for cylinder heads of internal combustion engines
DE2937216A1 (en) * 1979-09-14 1981-04-02 Klöckner-Humboldt-Deutz AG, 5000 Köln Light metal cylinder head for air cooled IC engine - has ceramic insert cast into domed base of head in zone exposed to max temps.
EP0462850A1 (en) * 1990-06-19 1991-12-27 Automobiles Peugeot Method of making aluminium alloy castings containing an insert and cylinder head of internal combustion engine obtained thereby
EP0484197A1 (en) * 1990-10-30 1992-05-06 Automobiles Peugeot Cylinder head of an internal combustion engine with cast metallic insert
US5295462A (en) * 1992-10-16 1994-03-22 Cummins Engine Co., Inc. Coin insert for the firing deck in an internal combustion engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017082846A1 (en) 2015-11-11 2017-05-18 Ford Otomotiv Sanayi A. S. Multi-piece cylinder head

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