EP0070212B1 - Fixing arrangement for a fire deck - Google Patents

Fixing arrangement for a fire deck Download PDF

Info

Publication number
EP0070212B1
EP0070212B1 EP82401140A EP82401140A EP0070212B1 EP 0070212 B1 EP0070212 B1 EP 0070212B1 EP 82401140 A EP82401140 A EP 82401140A EP 82401140 A EP82401140 A EP 82401140A EP 0070212 B1 EP0070212 B1 EP 0070212B1
Authority
EP
European Patent Office
Prior art keywords
cylinder head
cylinder
seat
barrier
screen
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.)
Expired
Application number
EP82401140A
Other languages
German (de)
French (fr)
Other versions
EP0070212A1 (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
Original Assignee
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.)
Filing date
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

Links

Images

Classifications

    • 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 simultaneously fixing and centering a heat shield usable in particular for the cylinder heads of an internal combustion engine fitted with a valve for controlling the transfer of gases in the combustion chamber of the 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.
  • 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 which have good resistance to thermal shock to withstand significant surface overheating and renewed at each combustion cycle.
  • Document US-A-4,046,114 describes a 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, the Gas transfer is controlled by seat valves fitted in the cylinder head.
  • the device consists of an injector pipe, the end of which is flared by pushing back, thereby fixing the pinched heat shield between the cylinder head and the cylinder liner.
  • Document DE-A-2,844,923 relates to the fixing of a thermal protection ring on the wall of a cylinder head by means of an annular peripheral rim with which the valve seats are provided.
  • One of the aims of the present invention is precisely to overcome the defects and requirements of the heat shields mentioned above for the combustion chambers.
  • the invention provides a device for simultaneously fixing and centering a heat shield, in which at least one of the attached valve seats is provided with an annular peripheral rim which, when the seat is fitted in its cylinder head bore, presses against the wall of the cylinder head, the heat shield which is also pinched between the cylinder head and the cylinder liner via the cylinder head gasket interposed between the cylinders and the cylinder head.
  • the contact between the annular rim of the valve seat and the screen is effected by means of at least a couple of two conjugate conical surfaces, formed respectively on the rim of the seat and on the screen so as to center the screen on the seat and make up for the play existing between the seat and the screen.
  • 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.
  • Modern combustion engines have tooth 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 attached valve seats fix the screen along a fixing line leaving on both sides possibilities of expansion on the screen.
  • the heat shield is held in position by the 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 of 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 rim 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 seat 5 or 6 and make 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 wall 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 fully equip the cylinder head 2 in particular by installing the valves and their return springs there. 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.

Landscapes

  • 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)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)
  • Building Environments (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 et de centrage simultanés d'un écran thermique utilisable en particulier pour les culasses de moteur à combustion interne munies de soupape pour contrôler le transfert des gaz dans la chambre de combustion du moteur.The present invention relates to means for simultaneously fixing and centering a heat shield usable in particular for the cylinder heads of an internal combustion engine fitted with a valve for controlling the transfer of gases in the combustion chamber of the 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 présentant une chambre de combustion délimitée par la surface 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 having a combustion chamber delimited by the 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 zone 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'autres cas, en particulier dans les moteurs diésel, 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.To limit the damage caused by the overheating of the walls of the combustion chamber and in other cases, in particular in diesel engines, to benefit from the effect of distillation and vaporization of the liquid fuel by the overheated walls, 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 overheated locally to vaporize the liquid fuel injected into the combustion chamber and trigger its ignition.

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 supporter une surchauffe de surface importante et renouvelée à chaque cycle de combustion.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 which have good resistance to thermal shock to withstand significant surface overheating 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, since the screens have relatively thin walls and tend to vibrate, which causes additional mechanical stresses.

Le document US-A-4.046.114 décrit un 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. Le dispositif est constitué par un tuyau pour injecteur dont l'extrémité est évasée par repoussage pour ainsi fixer l'écran thermique pincé entre la culasse et la chemise du cylindre.Document US-A-4,046,114 describes a 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, the Gas transfer is controlled by seat valves fitted in the cylinder head. The device consists of an injector pipe, the end of which is flared by pushing back, thereby fixing the pinched heat shield between the cylinder head and the cylinder liner.

Le document DE-A-2.844.923 se rapporte à la fixation d'un anneau de protection thermique sur la paroi d'une culasse par l'intermédiaire d'un rebord périphérique annulaire dont sont dotés les sièges des soupapes.Document DE-A-2,844,923 relates to the fixing of a thermal protection ring on the wall of a cylinder head by means of an annular peripheral rim with which the valve seats are provided.

L'un des buts de la présente invention est précisément de pallier les défauts et les exigences des écrans thermiques mentionnés ci-dessus pour les chambres de combustion.One of the aims of the present invention is precisely to overcome the defects and requirements of the heat shields mentioned above for the combustion chambers.

A cet effet, l'invention propose un dispositif de fixation et de centrage simultanés d'un écran thermique, dans lequel 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 chemise du cylindre par l'intermédiaire du joint de culasse interposé entre les cylindres et de la culasse.To this end, the invention provides a device for simultaneously fixing and centering a heat shield, in which at least one of the attached valve seats is provided with an annular peripheral rim which, when the seat is fitted in its cylinder head bore, presses against the wall of the cylinder head, the heat shield which is also pinched between the cylinder head and the cylinder liner via the cylinder head gasket interposed between the cylinders and the cylinder head.

Suivant une particularité essentielle 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 an essential feature of the invention, the contact between the annular rim of the valve seat and the screen is effected by means of at least a couple of two conjugate conical surfaces, formed respectively on the rim of the seat and on the screen so as to center the screen on the seat and make up for the play existing between the seat and the screen.

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 fréquences 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 soupapes 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.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.

Les moteurs à combustion modernes possèdent 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 r»iipJrtés et vient s'appliquer sur le joint de culasse.Modern combustion engines have tooth 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 attached valve seats fix the screen along 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 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 limitant 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 the view 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 représenté, 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 conjuguée 12 ménagée sur l'alésage de l'écran 7 traversé par le siège de soupape pour bien centrer l'écran 7 sur le siège 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 of 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 rim 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 seat 5 or 6 and make 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 paroi annulaire de fond 14 sert de butée au siège de soupape correspondant 5 ou 6.It can also be seen that the screen 7 has a countersink 13 in which the flange 8 is housed and whose annular bottom wall 14 serves as a stop for the corresponding valve seat 5 or 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.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 7.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 fully equip the cylinder head 2 in particular by installing the valves and their return springs there. 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.

Claims (2)

1. An arrangement for fixing a thermal barrier (7) which is intended in particular to protect the face of the cylinder head (2) forming 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 their seats inserted into the cylinder head, in which at least one of the valve seat Inserts (5, 6) is provided with an annular peripheral rim portion (8) and in which the thermal barrier (7) is gripped between the cylinder head (2) and the liner (1) of the cylinder by way of the cylinder heat gasket (9) that is interposed between the cylinders and the cylinder head (2), characterised in that the annular peripheral rim portion (8), at the moment at which the seat (5) is fitted into its bore in the cylinder head (2), acts to apply the thermal barrier (7) against the wall surface of the cylinder head (2), contact between the annular rim portion (8) of the valve seat and the barrier being made by way of at least one pair of conjugate conical surfaces (11, 12) which are respectively provided on the rim portion (8) of the seat (5, 6) and on the barrier (7), so as to ensure centering of the barrier (7) on the seat (5, 6) and to take up the clearances between the seat (5, 6) and the barrier (7).
2. An arrangement according to claim 1, characterised in that, when the cylinder head (2) is fitted to the engine block of the cylinders of the engine, the thermal barrier (7) is held in position by the inserted valve seats (5, 6) and bears against 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
FR8113612A FR2509372A1 (en) 1981-07-10 1981-07-10 DEVICE FOR FIXING A THERMAL SCREEN
FR8113612 1981-07-10

Publications (2)

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

Family

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

Country Status (6)

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

Families Citing this family (3)

* Cited by examiner, † Cited by third party
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
FR2603341B1 (en) * 1986-08-29 1990-09-14 Europ Propulsion CERAMIZED THERMAL ENGINE CYLINDER HEAD
WO2021242565A1 (en) 2020-05-27 2021-12-02 Cummins Inc. Anti-polish ring for an engine cylinder

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125082A (en) * 1964-03-17 Internal combustion engine cylinder heads
GB968342A (en) * 1961-03-01 1964-09-02 Ruston & Hornsby Ltd Improvements in 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
US4046114A (en) * 1975-10-06 1977-09-06 General Motors Corporation Insulated, high efficiency, low heat rejection, engine cylinder head
DE2816923C2 (en) * 1978-04-19 1983-01-27 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8500 Nürnberg Cylinder head for internal combustion engines
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
DE2911683A1 (en) * 1979-03-24 1980-10-02 Daimler Benz Ag SEALING A CYLINDER HEAD OF AN INTERNAL COMBUSTION ENGINE

Also Published As

Publication number Publication date
DE3263248D1 (en) 1985-05-30
US4449492A (en) 1984-05-22
FR2509372B1 (en) 1983-12-02
EP0070212A1 (en) 1983-01-19
PL237362A1 (en) 1983-03-14
ATE12972T1 (en) 1985-05-15
FR2509372A1 (en) 1983-01-14

Similar Documents

Publication Publication Date Title
US4774926A (en) Shielded insulation for combustion chamber
EP0210098B1 (en) Cylinder head for a fuel injection internal-combustion engine
US4362134A (en) Shielded valve
EP0049396B1 (en) Poppet valve shield
JP2005513335A (en) Combination of fuel injection valve and spark plug
FR2507682A1 (en) PRECOMBUSTION CHAMBER IN A CYLINDER HEAD OF A DIESEL ENGINE
US4616611A (en) Precombustion chamber construction of internal combustion engine
EP0070212B1 (en) Fixing arrangement for a fire deck
US4346870A (en) Thermal barrier for poppet valve
US4714062A (en) Sub-combustion chamber of an internal combustion engine
FR2549537A1 (en) INTERNAL COMBUSTION PISTON ENGINE WITH A WET CYLINDER SHIRT INSERTED INTO AN ENGINE HOUSING
US4514656A (en) Combination sparkplug and combustion process sensor
JPH0223788Y2 (en)
US4508066A (en) Ceramic head for internal combustion engine
FR2643417A1 (en) VALVE ASSEMBLY FOR EXPLOSION ENGINES
JPH0357298B2 (en)
JPH0144901B2 (en)
BE403020A (en) Improvement in internal combustion engines of the liquid fuel injection type
EP0229568B1 (en) Precombustion chamber with variable thermal insulation
JPS6117235Y2 (en)
EP0120792A1 (en) Cylinder head for an internal-combustion diesel engine
JPH0121160Y2 (en)
JPS602455Y2 (en) Ceramic glow plug
FR2596808A1 (en) Direct injection diesel engine piston
JPS6313384Y2 (en)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19820625

AK Designated contracting states

Designated state(s): AT CH DE FR GB IT LI NL SE

ITF It: translation for a ep patent filed

Owner name: JACOBACCI & PERANI S.P.A.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): AT CH DE FR GB IT LI NL SE

REF Corresponds to:

Ref document number: 12972

Country of ref document: AT

Date of ref document: 19850515

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3263248

Country of ref document: DE

Date of ref document: 19850530

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19860521

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19860630

Year of fee payment: 5

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19870622

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19870623

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19870630

Ref country code: CH

Effective date: 19870630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19880101

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19880226

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19880301

GBPC Gb: european patent ceased through non-payment of renewal fee
REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19881121

EUG Se: european patent has lapsed

Ref document number: 82401140.7

Effective date: 19880713