EP0070212A1 - Fixing arrangement for a fire deck - Google Patents

Fixing arrangement for a fire deck Download PDF

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Publication number
EP0070212A1
EP0070212A1 EP82401140A EP82401140A EP0070212A1 EP 0070212 A1 EP0070212 A1 EP 0070212A1 EP 82401140 A EP82401140 A EP 82401140A EP 82401140 A EP82401140 A EP 82401140A EP 0070212 A1 EP0070212 A1 EP 0070212A1
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EP
European Patent Office
Prior art keywords
cylinder head
screen
seat
cylinder
heat shield
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
EP82401140A
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German (de)
French (fr)
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EP0070212B1 (en
Inventor
Jean-Paul Reynaud
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault Trucks SAS
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Renault Vehicules Industriels SA
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Renault Vehicules Industriels SA filed Critical Renault Vehicules Industriels SA
Priority to AT82401140T priority Critical patent/ATE12972T1/en
Publication of EP0070212A1 publication Critical patent/EP0070212A1/en
Application granted granted Critical
Publication of EP0070212B1 publication Critical patent/EP0070212B1/en
Expired legal-status Critical Current

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    • 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
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/11—Thermal or acoustic insulation
    • 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
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/02—Surface coverings of combustion-gas-swept parts
    • 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
    • F02F2001/249—Cylinder heads with flame plate, e.g. insert in the cylinder head used as a thermal insulation between cylinder head and combustion chamber

Definitions

  • the present invention relates to means for fixing a screen hermal the usable particularly for internal combustion engine cylinder head provided with valve for controlling the transfer of gas into the chamber I combustion engine.
  • the combustion chambers are generally delimited by the internal walls of a cylinder, by the face of a piston which moves in the cylinder under the combined effect of the pressure of the gases of the combustion chamber and the inertia of the mechanical drive means of the piston, and, respectively, by the internal walls of a cylinder closing cylinder head often constituting the hottest part of the envelope of the combustion chamber.
  • rotary combustion engine have a combustion chamber delimited by the external surface of a rotary piston and by the walls of a cylinder head enveloping the rotary piston and in which the combustion of the combustible gas mixture always starts in the same area without any gaseous cooling by the fresh combustible gases admitted into the combustion chamber.
  • the device for fixing a heat shield intended in particular to protect the face of the cylinder head constituting one of the walls of the combustion chamber of the cylinder of an internal combustion engine whose transfer of gases is controlled by of valves with seat added in the cylinder head is characterized in that at least one of the seats of valve added has an annular peripheral rim which, at the moment of the fitting of the seat in its bore of the cylinder head comes to rest on the wall of the cylinder head the heat shield which is also pinched between the cylinder head and the cylinder intermediate via the cylinder head gasket interposed between the cylinders and the cylinder head.
  • the screen made up of a thin flexible plate is clamped in relatively close areas of the intake and exhaust valves, which makes it possible to suppress or reduce the vibrations which could arise. at certain engine rotation speeds exciting the natural frequencies of vibration of the flexible plate.
  • the precision of fixing of the plate and its centering remain relatively favorable taking into account the precision of fixing of the valve seats in the cylinder head.
  • the plate constituting the screen can perfectly match the shape of the walls of the combustion chamber while retaining the possibility of expanding relative to the valve seats and to the edge of the cylinder liner.
  • the contact between the annular rim of the valve seat and the screen is effected by means of at least a pair of two conjugate conical surfaces, formed respectively on the rim of the seat and on the screen so as to ensure the centering of the screen on the seat and the adjustment of the games existing between the seat and the screen.
  • Modern combustion engines having at least one intake valve and one exhaust valve which, in diesel engines in particular, are often aligned in the center of the cylinder and along the general axis of the engine, the two valve seats attached fix the screen according to a fixing line leaving on both sides possibilities of expansion on the screen.
  • the heat shield is held in position by the attached valve seats and is applied to the cylinder head gasket.
  • a separate heat shield is provided for each cylinder of the engine and is applied between the cylinder head and the jacket of each cylinder.
  • the combustion chamber shown in the figure and corresponding to the cylinder of an internal combustion engine is delimited by the jacket 1 of the cylinder, by the movable piston inside this cylinder and not shown, and respectively by the cylinder head 2 of the engine in bores 3 and 4 from which are fitted by hard fitting of the seats of intake and exhaust valves 6.
  • a heat shield 7 consisting of a thin plate made of a suitable material such as refractory ceramic and / or relatively heat insulating is fixed according to the invention by pressing an annular peripheral flange 8 of the valve seats 5 and 6 which presses the screen 7 on the relatively flat wall of the part of the combustion chamber defined by the cylinder head 2.
  • the cylinder head gasket 9 interposed between the cylinder head 2 and the upper face 10 of the liner 1 elastically pinches the thermal screen on its periphery.
  • the connection between the body of the valve seat 5 and 6 and the flange 8 has a conical surface 11 which cooperates with a conjugate conical surface 12 formed on the bore of the screen 7 traversed by the valve seat to properly center the screen 7 on the corresponding valve seat laying 5 or 6 and making up for the inevitable clearances existing between the bore of the screen 7 and the external surface of the valve seat which passes through this bore.
  • the screen 7 has a countersink 13 in which the flange 8 is housed and whose annular bottom portion 14 serves as a stop for the corresponding valve seat 5 or 6.
  • the intake and exhaust valves are aligned transversely along an axis line passing through the longitudinal axis 15 of the cylinder and through the general axis of the line of the engine cylinders.
  • the screen covers a reduced surface of the cylinder head wall in the central axial part thereof which is in fact covered by the cylinder valves.
  • larger surfaces of the cylinder head are covered by the screen 7 beyond this axial part of the cylinder head appearing in the section plane of the figure.
  • the mounting of the heat shield 7 is carried out as follows: the shield 7 is placed in position in the cylinder head before the fitting of the valve seats 5 and 6 in their corresponding bores 3 and 4. The valve seats 5 and 6 are then force fitted into their bore to tighten the screen 7 by their flange 8 and center it by their conical surface 11. The screen and the valve seats being mounted, it is then possible to equip completely the cylinder head 2 in particular by installing the valves and their return springs therein. The fixing of the screens 7 is then completed when the cylinder head 2 is tightened on the engine block surrounding the liners 1 because the edges of the screen 7 come to bear on the cylinder head gasket 9 which is relatively elastic and which allows these edges to move. of the screen under the effect of the temperature variations of the screen 7 and the differential expansions between the jacket 1, the cylinder head gasket 9 and the heat screen 7

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Physics & Mathematics (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Building Environments (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Radiation Pyrometers (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Abstract

An attachment for a heat shield is intended to protect the face of the cylinder head comprising one of the walls of the combustion chamber of the cylinder of an internal combustion engine in which the transfer of gases is controlled by valves having seats inserted into the cylinder head. The inserted seats of the valves are provided with an annular rim which, when the seat is fitted into a bore in the cylinder head, presses against the wall of the cylinder head the heat shield. Application is to insulating the inner walls of a heat engine cylinder head or to creating hot points in the combustion chamber of the cylinder head.

Description

La présente invention se rapporte aux moyens de fixation d'un écran lhermique utilisable en particulier pour les culasses de moteur à combustion interne munies de soupape pour contrôler le transfert des gaz dans la chambre je combustion du moteur.The present invention relates to means for fixing a screen hermal the usable particularly for internal combustion engine cylinder head provided with valve for controlling the transfer of gas into the chamber I combustion engine.

Dans les moteurs à combustion de type connu, les chambres de combustion sont délimitées en général par les parois internes d'un cylindre,par la face d'un piston qui se déplace dans le cylindre sous l'effet combiné de la pression des gaz de la chambre de combustion et de l'inertie des moyens d'entraînement mécaniques du piston, et, respectivement par les parois internes d'une culasse de fermeture du cylindre constituant souvent la partie la plus chaude de l'enveloppe de la chambre de combustion.In combustion engines of known type, the combustion chambers are generally delimited by the internal walls of a cylinder, by the face of a piston which moves in the cylinder under the combined effect of the pressure of the gases of the combustion chamber and the inertia of the mechanical drive means of the piston, and, respectively, by the internal walls of a cylinder closing cylinder head often constituting the hottest part of the envelope of the combustion chamber.

D'autres types de moteur à combustion rotatif présentent une chambre de combustion délimitée par la surface extérieure d'un piston rotatif et par les parois d'une culasse enveloppant le piston rotatif et dans laquelle la combustion du mélange gazeux combustible se déclenche toujours dans la même zone sans aucun refroidissement gazeux par les gaz combustibles frais admis dans la chambre de combustion.Other types of rotary combustion engine have a combustion chamber delimited by the external surface of a rotary piston and by the walls of a cylinder head enveloping the rotary piston and in which the combustion of the combustible gas mixture always starts in the same area without any gaseous cooling by the fresh combustible gases admitted into the combustion chamber.

Pour limiter les dégradations causées par la surchauffe des parois de la chambre de combustion et dans d'autrescas, en particulier dans les moteurs Ciésel, pour bénéficier de l'effet de distillation et de vaporisation du combustible liquide par les parois surchauffées, on a déjà proposé de recouvrir certaines des parois de la chambre de combustion des moteurs thermiques d'un écran thermique qui protège le métal de la paroi de la surchauffe et respectivement dans d'autres cas, grâce à ses propriétés relatives d'isolant thermique, est surchauffé localement pour vaporiser le combustible liquide injecté dans la chambre de combustion et déclencher son allumage. Les matériaux les plus fréquemment utilisés pour ces écrans thermiques sont des céramiques constituées par exemple d'oxydes de zirconium, de nitrures ou de carbures de silicium et élaborées par frittage après pressage à froid ou à chaud. D'autres matériaux utilisés pour ces écrans thermiques sont des réfractaires et/ou des alliages faiblement conducteurs et présentant une bonne résistance aux chocs thermiques pour suppurter une surchauffe de surface impor- tante et renouvelée à chaque cycle de combustion.To limit the damage caused by the overheating of the walls of the combustion chamber and in other cases, in particular in Ciesel engines, to benefit from the effect of distillation and vaporization of the liquid fuel by the overheated walls, we have already proposed to cover some of the walls of the combustion chamber of heat engines with a heat shield which protects the metal of the wall from overheating and respectively in other cases, thanks to its relative thermal insulating properties, is locally overheated to vaporize the liquid fuel injected into the combustion chamber and trigger its ignition. The materials most frequently used for these heat shields are ceramics consisting for example of zirconium oxides, nitrides or silicon carbides and produced by sintering after cold or hot pressing. Other materials used for these heat shields are refractories and / or alloys which are weakly conductive and have good thermal shock resistance to a surface overheating suppurter i m po r - aunt and renewed at each combustion cycle.

La fixation de ces écrans est difficile en raison, d'une part de leur coefficient de dilatation souvent différent de celui du matériau de l'élément à protéger, et d'autre part, des gradients de température importants régnant dans la chambre de combustion. Les ancrages habituellement réalisés pour ces fixations ne tiennent pas compte des variations relatives de dimensions entre l'écran et l'élément, ce qui se traduit généralement par des fissurations suivies de la destruction de l'écran ou de l'élément à protéger. De plus, les ancrages doivent être suffisamment rapprochés, car les écrans possèdent des parois relativement minces et ont tendance à vibrer, ce qui provoque des sollicitations mécaniques supplémentaires.Fixing these screens is difficult due, on the one hand, to their coefficient of expansion, which is often different from that of the material of the element to be protected, and, on the other hand, to the large temperature gradients prevailing in the combustion chamber. The anchors usually made for these fasteners do not take account of the relative variations in dimensions between the screen and the element, which generally results in cracks followed by the destruction of the screen or of the element to be protected. In addition, the anchors must be close enough, because the screens have relatively thin walls and tend to vibrate, which causes additional mechanical stresses.

L'un des buts de la présente invention est précisément de pallier ces défauts et ces exigences des écrans thermiques pour les chambres de combustion. A cet effet, le dispositif de fixation d'un écran thermique destiné notamment à protéger la face de la culasse constituant l'une des parois de la chambre de combustion du cylindre d'un moteur à combustion interne dont le transfert des gaz est contrôlé par des soupapes à siège rapporté dans la culasse, est caractérisé en ce qu'au moins un des sièges de soupape rapporté est doté d'un rebord périphérique annulaire qui, au moment de l'emmanchement du siège dans son alésage de la culasse vient plaquer sur la paroi de la culasse l'écran thermique qui est par ailleurs pincé entre la culasse et la cnemise du cylindre par l'intermédiaire du joint de culasse interposé entre les cylindres et la culasse. Grâce à ce moyen de fixation relativement simple et économique, l'écran constitué d'une plaque flexible mince est serré dans des zones relativement rapprochées des soupapes d'admission et d'échappement ce qui permet de supprimer ou de réduire les vibrations qui pourraient naître à certains régimes de rotation du moteur excitant les fréquence propres de vibration de la plaque flexible. De plus, la précision de fixation de la plaque et son centrage restent relativement favorables compte tenu de la précision de fixation des sièges de soupape dans la culasse. La plaque constituant l'écran peut épouser parfaitement la forme des parois de la chambre de combustion tout en conservant la possibilité de se dilater par rapport aux sièges de soupape et au bord de la chemise du cylindre.One of the aims of the present invention is precisely to overcome these defects and these requirements for heat shields for combustion chambers. To this end, the device for fixing a heat shield intended in particular to protect the face of the cylinder head constituting one of the walls of the combustion chamber of the cylinder of an internal combustion engine whose transfer of gases is controlled by of valves with seat added in the cylinder head, is characterized in that at least one of the seats of valve added has an annular peripheral rim which, at the moment of the fitting of the seat in its bore of the cylinder head comes to rest on the wall of the cylinder head the heat shield which is also pinched between the cylinder head and the cylinder intermediate via the cylinder head gasket interposed between the cylinders and the cylinder head. Thanks to this relatively simple and economical fixing means, the screen made up of a thin flexible plate is clamped in relatively close areas of the intake and exhaust valves, which makes it possible to suppress or reduce the vibrations which could arise. at certain engine rotation speeds exciting the natural frequencies of vibration of the flexible plate. In addition, the precision of fixing of the plate and its centering remain relatively favorable taking into account the precision of fixing of the valve seats in the cylinder head. The plate constituting the screen can perfectly match the shape of the walls of the combustion chamber while retaining the possibility of expanding relative to the valve seats and to the edge of the cylinder liner.

Selon un autre mode de réalisation de l'invention, le contact entre le rebord annulaire du siège de soupape et l'écran s'effectue par l'intermédiaire d'au moins un couple de deux surfaces coniques conjuguées, ménagées respectivement sur le rebord du siège et sur l'écran de manière à assurer le centrage de l'écran sur le siège et le rattrapage des jeux existant entre le siège et l'écran.According to another embodiment of the invention, the contact between the annular rim of the valve seat and the screen is effected by means of at least a pair of two conjugate conical surfaces, formed respectively on the rim of the seat and on the screen so as to ensure the centering of the screen on the seat and the adjustment of the games existing between the seat and the screen.

Les moteurs à combustion modernes possédant au moins une soupape d'admission et une soupape d'échappement qui,dans les moteurs Diésel en particulier, sont souvent alignées au centre du cylindre et selon l'axe général du moteur, les deux sièges de soupape rapportés viennent fixer l'écran selon une ligne de fixation laissant de part et d'autre des possibilités de dilatation à l'écran. Au montage de la culasse sur le bloc moteur des cylindres du moteur, l'écran thermique est maintenu en position par les sièges de soupape rapportés et vient s'appliquer sur le joint de culasse.Modern combustion engines having at least one intake valve and one exhaust valve which, in diesel engines in particular, are often aligned in the center of the cylinder and along the general axis of the engine, the two valve seats attached fix the screen according to a fixing line leaving on both sides possibilities of expansion on the screen. When the cylinder head is mounted on the engine block of the engine cylinders, the heat shield is held in position by the attached valve seats and is applied to the cylinder head gasket.

Dans la forme de réalisation la plus pratique de l'invention, un écran thermique séparé est prévu pour chaque cylindre du moteur et vient s'appliquer entre la culasse et la chemise de chaque cylindre.In the most practical embodiment of the invention, a separate heat shield is provided for each cylinder of the engine and is applied between the cylinder head and the jacket of each cylinder.

D'autres buts, avantages et caractéristiques de l'invention apparaîtront à la lecture de la description qui va suivre d'un mode de réalisation non limitatif de l'invention faite en regard du dessin annexé, où la figure unique représente en coupe, avec arrachements linitant strictement la vue à cette partie, la chambre de combustion du cylindre d'un moteur à combustion interne de type Diésel équipée d'un écran thermique fixé selon l'invention avant la mise en place des soupapes.Other objects, advantages and characteristics of the invention will appear on reading the following description of a non-limiting embodiment of the invention made with reference to the appended drawing, where the single figure represents in section, with cut-outs strictly limiting sight to this part, the combustion chamber of the cylinder of an internal combustion engine of the Diesel type equipped with a heat shield fixed according to the invention before the installation of the valves.

La chambre de combustion représentée sur la figure et correspondant au cylindre d'un moteur à combustion interne, est délimitée par la chemise 1 du cylindre, par le piston mobile à l'intérieur de ce cylindre et non représente, et respectivement par la culasse 2 du moteur dans des alésages 3 et 4 de laquelle sont rapportés par emmanchement dur des sièges de soupapes d'admission 5 et d'échappement 6. Un écran thermique 7 constitué d'une plaque mince en un matériau adéquat tel qu'une céramique réfractaire et/ou relativement isolante à la chaleur est fixé selon l'invention par appui d'un rebord périphérique annulaire 8 des sièges de soupape 5 et 6 qui vient plaquer l'écran 7 sur la paroi relativement plane de la partie de la chambre de combustion délimitée par la culasse 2. Pour parachever la fixation de l'écran 7, le joint de culasse 9 interposé entre la culasse 2 et la face supérieure 10 de la chemise 1 vient pincer élastiquement l'écran thermique sur sa périphérie. La liaison entre le corps du siège des soupapes 5 et 6 et le rebord 8 comporte une surface conique 11 qui coopère avec une surface conique conjuguee 12 ménagée sur l'alésage de l'écran 7 traversé par le siège de soupape pour bien centrer l'écran 7 sur le siège de soupape correspondant 5 ou 6 et rattraper les jeux inévitables existant entre l'alésage de l'écran 7 et la surface extérieure du siège de soupape qui traverse cet alésage.The combustion chamber shown in the figure and corresponding to the cylinder of an internal combustion engine, is delimited by the jacket 1 of the cylinder, by the movable piston inside this cylinder and not shown, and respectively by the cylinder head 2 of the engine in bores 3 and 4 from which are fitted by hard fitting of the seats of intake and exhaust valves 6. A heat shield 7 consisting of a thin plate made of a suitable material such as refractory ceramic and / or relatively heat insulating is fixed according to the invention by pressing an annular peripheral flange 8 of the valve seats 5 and 6 which presses the screen 7 on the relatively flat wall of the part of the combustion chamber defined by the cylinder head 2. To complete the fixing of the screen 7, the cylinder head gasket 9 interposed between the cylinder head 2 and the upper face 10 of the liner 1 elastically pinches the thermal screen on its periphery. The connection between the body of the valve seat 5 and 6 and the flange 8 has a conical surface 11 which cooperates with a conjugate conical surface 12 formed on the bore of the screen 7 traversed by the valve seat to properly center the screen 7 on the corresponding valve seat laying 5 or 6 and making up for the inevitable clearances existing between the bore of the screen 7 and the external surface of the valve seat which passes through this bore.

On voit de plus que l'écran 7 possède un lamage 13 dans lequel vient se loger le rebord 8 et dont la parci annulaire de fond 14 sert de butée au siège de soupape correspondant 5 ou 6. Dans la disposition représentée sur la figure, les soupapes d'admission et d'échappement sont alignées transversalement selon une ligne d'axe passant par l'axe longitudinal 15 du cylindre et par l'axe général de la ligne des cylindres du moteur. L'écran couvre une surface réduite de la paroi de la culasse dans la partie axiale centrale de celle-ci qui est en fait couverte par les soupapes du cylindre. Par contre, des surfaces plus importantes de la culasse sont recouvertes par l'écran 7 au-delà de cette partie axiale de la culasse figurant dans le plan de coupe de la figure.It can also be seen that the screen 7 has a countersink 13 in which the flange 8 is housed and whose annular bottom portion 14 serves as a stop for the corresponding valve seat 5 or 6. In the arrangement shown in the figure, the intake and exhaust valves are aligned transversely along an axis line passing through the longitudinal axis 15 of the cylinder and through the general axis of the line of the engine cylinders. The screen covers a reduced surface of the cylinder head wall in the central axial part thereof which is in fact covered by the cylinder valves. On the other hand, larger surfaces of the cylinder head are covered by the screen 7 beyond this axial part of the cylinder head appearing in the section plane of the figure.

Le montage de l'écran thermique 7 s'effectue de la manière suivante: l'écran 7 est mis en position dans la culasse avant l'emmanchement des sièges de soupape 5 et 6 dans leurs alésages correspondants 3 et 4. Les sièges de soupape 5 et 6 sont ensuite emmanchés à force dans leur alésage pour venir serrer l'écran 7 par leur rebord 8 et le centrer par leur surface conique 11. L'écran et les sièges de soupape étant montés, il est alors possible d'équiper complètement la culasse 2 notamment en y installant les soupapes et leurs ressorts de rappel. La fixation des écrans 7 est ensuite parachevée au moment du serrage de la culasse 2 sur le bloc moteur entourant les chemises 1 car les bords de l'écran 7 viennent porter sur le joint de culasse 9 relativement élastique et qui autorise les déplacements de ces bords de l'écran sous l'effet des variations de température de l'écran 7 et des dilatations différentielles entre la chemise 1, le joint de culasse 9 et l'écran thermique 7The mounting of the heat shield 7 is carried out as follows: the shield 7 is placed in position in the cylinder head before the fitting of the valve seats 5 and 6 in their corresponding bores 3 and 4. The valve seats 5 and 6 are then force fitted into their bore to tighten the screen 7 by their flange 8 and center it by their conical surface 11. The screen and the valve seats being mounted, it is then possible to equip completely the cylinder head 2 in particular by installing the valves and their return springs therein. The fixing of the screens 7 is then completed when the cylinder head 2 is tightened on the engine block surrounding the liners 1 because the edges of the screen 7 come to bear on the cylinder head gasket 9 which is relatively elastic and which allows these edges to move. of the screen under the effect of the temperature variations of the screen 7 and the differential expansions between the jacket 1, the cylinder head gasket 9 and the heat screen 7

Bien entendu, la présente invention n'est pas limitée aux modes de réalisation décrits et représentés; elle est susceptible de nombreuses variantes accessibles à l'homme de l'art, suivant les applications envisagées et sans que l'on ne s'écarte de l'esprit de l'invention.Of course, the present invention is not limited to the embodiments described and shown; it is susceptible of numerous variants accessible to those skilled in the art, depending on the applications envisaged and without departing from the spirit of the invention.

Claims (3)

1.- Dispositif de fixation d'un écran thermique destiné notaient à protéger la face de la culasse constituant l'une des parois de la chambre de combustion du cylindre d'un moteur à combustion interne dont le transfert des gaz est contrôlé par des soupapes à siège rapporté dans la culasse, caractérisé en ce qu'au moins un des sièges de soupape rapporté (5, 6) est dote d'un rebord périphérique annulaire (8) qui, au moment de l'emmanchement du siège (5, 6) dans son alésage de la culasse (2), vient plaquer sur la paroi de la culasse (2) l'écran thermique (7) qui est par ailleurs pincé entre la culasse (2) et la chemise (1) du cylindre par l'intermédiaire du joint de culasse (9) interposé entre les cylindres et la culasse (2).1.- Device for fixing a heat shield intended to protect the face of the cylinder head constituting one of the walls of the combustion chamber of the cylinder of an internal combustion engine whose transfer of gases is controlled by valves with attached seat in the cylinder head, characterized in that at least one of the added valve seats (5, 6) is provided with an annular peripheral rim (8) which, at the moment of fitting the seat (5, 6 ) in its bore of the cylinder head (2), presses against the wall of the cylinder head (2) the heat shield (7) which is also pinched between the cylinder head (2) and the jacket (1) of the cylinder by the 'Intermediate of the cylinder head gasket (9) interposed between the cylinders and the cylinder head (2). 2.- Dispositif selon la revendication 1, caractérisé en ce que le contact entre le rebord annulaire (8) du siège de soupape et l'écran s'effectue par l'intermédiaire d'au moins un couple de deux surfaces coniques conjuguées (11, 12) ménagées respectivement sur le rebord (8) du siège (5, 6) et sur l'écran (7) de manière à assurer le centrage de l'écran (7) sur le siège (5, 6) et le rattrapage des jeux existant entre le siège (5, 6) et l'écran (7).2.- Device according to claim 1, characterized in that the contact between the annular flange (8) of the valve seat and the screen is effected by means of at least a couple of two conjugate conical surfaces (11 , 12) formed respectively on the edge (8) of the seat (5, 6) and on the screen (7) so as to ensure the centering of the screen (7) on the seat (5, 6) and the take-up games existing between the seat (5, 6) and the screen (7). 3.- Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que, au montage de la culasse (2) sur le bloc moteur des cylindres du moteur, l'écran thermique (7) est maintenu en position par les sièges de soupape rapportés (5, 6) et vient s'appliquer sur le joint de culasse (9).3.- Device according to one of claims 1 to 4, characterized in that, when mounting the cylinder head (2) on the engine block of the engine cylinders, the heat shield (7) is held in position by the seats valve insert (5, 6) and is applied to the cylinder head gasket (9).
EP82401140A 1981-07-10 1982-06-22 Fixing arrangement for a fire deck Expired EP0070212B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82401140T ATE12972T1 (en) 1981-07-10 1982-06-22 ARRANGEMENT FOR FIXING A THERMAL PROTECTION.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8113612 1981-07-10
FR8113612A FR2509372A1 (en) 1981-07-10 1981-07-10 DEVICE FOR FIXING A THERMAL SCREEN

Publications (2)

Publication Number Publication Date
EP0070212A1 true EP0070212A1 (en) 1983-01-19
EP0070212B1 EP0070212B1 (en) 1985-04-24

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ID=9260430

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401140A Expired EP0070212B1 (en) 1981-07-10 1982-06-22 Fixing arrangement for a fire deck

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US (1) US4449492A (en)
EP (1) EP0070212B1 (en)
AT (1) ATE12972T1 (en)
DE (1) DE3263248D1 (en)
FR (1) FR2509372A1 (en)
PL (1) PL237362A1 (en)

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Publication number Priority date Publication date Assignee Title
FR2603341A1 (en) * 1986-08-29 1988-03-04 Europ Propulsion I.C. engine cylinder head with ceramic lining - has lining in form of plate held in head recess by flexible U=shaped coupling strip

Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
DE3331145C2 (en) * 1983-08-30 1986-08-28 Audi AG, 8070 Ingolstadt Light alloy cylinder head for reciprocating internal combustion engines
EP4158178A1 (en) 2020-05-27 2023-04-05 Cummins, Inc. Anti-polish ring for an engine cylinder

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GB968342A (en) * 1961-03-01 1964-09-02 Ruston & Hornsby Ltd Improvements in internal combustion engine cylinder heads
US4046114A (en) * 1975-10-06 1977-09-06 General Motors Corporation Insulated, high efficiency, low heat rejection, engine cylinder head
DE2844923A1 (en) * 1978-10-14 1980-05-29 Maschf Augsburg Nuernberg Ag IC engine cylinder head - has pressed-in valve seat rings protected by larger dia. protector rings located in stepped recesses
FR2452602A1 (en) * 1979-03-24 1980-10-24 Daimler Benz Ag PROCESS FOR REALIZING THE SEAL BETWEEN CYLINDER HEAD AND CYLINDER BLOCK OF AN INTERNAL COMBUSTION ENGINE

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US3125082A (en) * 1964-03-17 Internal combustion engine cylinder heads
US3115127A (en) * 1961-10-02 1963-12-24 Charles O Spencer Removable insert for internal combustion chambers
US3436085A (en) * 1966-01-19 1969-04-01 Cleveland Technical Center Inc Sealing structure embodying deformable ring
DE2816923C2 (en) * 1978-04-19 1983-01-27 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8500 Nürnberg Cylinder head for internal combustion engines

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GB968342A (en) * 1961-03-01 1964-09-02 Ruston & Hornsby Ltd Improvements in internal combustion engine cylinder heads
US4046114A (en) * 1975-10-06 1977-09-06 General Motors Corporation Insulated, high efficiency, low heat rejection, engine cylinder head
DE2844923A1 (en) * 1978-10-14 1980-05-29 Maschf Augsburg Nuernberg Ag IC engine cylinder head - has pressed-in valve seat rings protected by larger dia. protector rings located in stepped recesses
FR2452602A1 (en) * 1979-03-24 1980-10-24 Daimler Benz Ag PROCESS FOR REALIZING THE SEAL BETWEEN CYLINDER HEAD AND CYLINDER BLOCK OF AN INTERNAL COMBUSTION ENGINE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2603341A1 (en) * 1986-08-29 1988-03-04 Europ Propulsion I.C. engine cylinder head with ceramic lining - has lining in form of plate held in head recess by flexible U=shaped coupling strip

Also Published As

Publication number Publication date
DE3263248D1 (en) 1985-05-30
FR2509372A1 (en) 1983-01-14
FR2509372B1 (en) 1983-12-02
US4449492A (en) 1984-05-22
ATE12972T1 (en) 1985-05-15
EP0070212B1 (en) 1985-04-24
PL237362A1 (en) 1983-03-14

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