FR2596104A1 - THERMALLY INSULATING PISTON IN PARTICULAR FOR A SELF-IGNITION ENGINE - Google Patents

THERMALLY INSULATING PISTON IN PARTICULAR FOR A SELF-IGNITION ENGINE Download PDF

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Publication number
FR2596104A1
FR2596104A1 FR8703731A FR8703731A FR2596104A1 FR 2596104 A1 FR2596104 A1 FR 2596104A1 FR 8703731 A FR8703731 A FR 8703731A FR 8703731 A FR8703731 A FR 8703731A FR 2596104 A1 FR2596104 A1 FR 2596104A1
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France
Prior art keywords
piston
combustion chamber
thermal insulation
plate
self
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Granted
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FR8703731A
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French (fr)
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FR2596104B1 (en
Inventor
Norbert Zernig
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Kloeckner Humboldt Deutz AG
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Kloeckner Humboldt Deutz AG
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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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0678—Unconventional, complex or non-rotationally symmetrical shapes of the combustion space, e.g. flower like, having special shapes related to the orientation of the fuel spray jets
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0603—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part, e.g. combustion space formed within a ceramic part fixed to a metal piston head
    • 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
    • F02F3/00—Pistons 
    • F02F3/10—Pistons  having surface coverings
    • F02F3/12—Pistons  having surface coverings on piston 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0603—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part, e.g. combustion space formed within a ceramic part fixed to a metal piston head
    • F02B2023/0612—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part, e.g. combustion space formed within a ceramic part fixed to a metal piston head the material having a high temperature and pressure resistance, e.g. ceramic
    • 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
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/14—Direct injection into combustion chamber
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0618—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston having in-cylinder means to influence the charge motion
    • F02B23/0624—Swirl flow
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0645—Details related to the fuel injector or the fuel spray
    • F02B23/0654—Thermal treatments, e.g. with heating elements or local cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2251/00—Material properties
    • F05C2251/04—Thermal properties
    • F05C2251/048—Heat transfer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

A) PISTON A ISOLATION THERMIQUE NOTAMMENT POUR MOTEURS A AUTO-ALLUMAGE. B) PISTON CARACTERISE EN CE QUE L'ISOLATION THERMIQUE EST UNIQUEMENT PREVUE SUR LE FOND 6 DU PISTON ET SUR LE FOND 8 DE LA CHAMBRE DE COMBUSTION, ET EST UNE COUCHE CERAMIQUE 12 REALISEE PAR PROJECTION.A) THERMAL INSULATED PISTON, ESPECIALLY FOR SELF-IGNITION ENGINES. B) PISTON CHARACTERIZED IN THAT THERMAL INSULATION IS ONLY PROVIDED ON BOTTOM 6 OF THE PISTON AND BOTTOM 8 OF THE COMBUSTION CHAMBER, AND IS A CERAMIC LAYER 12 MADE BY PROJECTION.

Description

"Piston à isolation thermique notamment pour moteur à"Thermally insulated piston, particularly for a motor

auto-allumage ".auto-ignition ".

L'invention concerne un piston com5 portant une chambre de combustion intégrée en forme de pot dans le fond du piston applicable à un moteur à combustion interne à auto-allumage, le piston étant isolé en partie  The invention relates to a piston com5 carrying a built-in combustion chamber in the form of a pot in the bottom of the piston applicable to a self-igniting internal combustion engine, the piston being partially isolated.

thermiquement du c6té de la tête de cylindre.  thermally on the side of the cylinder head.

Selon EP-A 0 129 266, on connaît un 10 piston comportant une cavite en forme de pot constituant une chambre de combustion, les parois latérales de cette chambre de combustion étant isolées thermiquement. Cette réalisation permet une isolation thermique et par suite des températures élevées de parois au niveau de l'arrivée 15 des jets de carburant. Une telle réalisation offre certes des avantages sur le plan des moyens à mettre en oeuvre pour refroidir le piston, mais l'isolation thermique des parois latérales de la chambre de combustion s'est avérée gênante sur le plan de la combustion. Des essais effectués 20 sur des tels pistons isolés ont montré que des parois de chambres de combustion extrêmement chaudes exerçaient une influence défavorable sur la consommation et la qualité  According to EP-A 0 129 266, there is known a piston comprising a pot-shaped cavity constituting a combustion chamber, the side walls of this combustion chamber being thermally insulated. This embodiment allows thermal insulation and consequently high wall temperatures at the arrival of the fuel jets. Such an embodiment certainly offers advantages in terms of means to implement to cool the piston, but the thermal insulation of the side walls of the combustion chamber has been inconvenient in terms of combustion. Tests on such insulated pistons have shown that extremely hot combustion chamber walls exert an adverse influence on consumption and quality.

des gaz d'échappement.exhaust gas.

La présente invention a pour but de 25 créer un piston comportant une cavité en forme de pot constituant une chambre de combustion qui soit isolée  It is an object of the present invention to provide a piston having a pot-shaped cavity constituting a combustion chamber which is isolated

thermiquement de manière à réduire les moyens de refroi-  thermally so as to reduce the means of cooling

dissement du piston sans influencer de façon défavorable  plunging of the piston without adversely influencing

la consommation en carburant et la qualité des gaz d'échappement de la combustion.  fuel consumption and the quality of the exhaust gases from combustion.

A cet effet, l'invention concerne un piston du type ci-dessus, caractérisé en ce que l'isolation thermique est uniquement prévue sur le fond du piston et sur le fond de la chambre de combustion. Du fait que l'isolation thermique soit uniquement prévue au fond du piston et au fond de la chambre de combustion, on réduit la perte de puissance du moteur à combustion interne au niveau du refroidissement des pièces. En même temps, pour les moteurs à combustion interne réalisés de telle manière, il n'y a aucun inconvénient sur le plan d'une consommation plus impor15 tante ou d'une émission de gaz d'échappement plus importante ou plus mauvaise. Cela réside dans le fait que les zones de la cavité formant la chambre de combustion dans le piston, zones dans lesquelles arrive le carburant injecté dans la cavité formant la chambre de combustion ne sont pas isolées thermiquement et de ce fait la chaleur ainsi engendrée est bien évacuée vers les zones plus froides du piston. On a constaté que les températures d'un piston à isolation thermique selon l'invention étaient abaissées dans la zone des parois latérales de la chambre 25 de combustion a un niveau inférieur à celui d'un piston sans isolation thermique. Ainsi, en plus de moyens de refroidissement réduits, on a également des avantages sur le plan de la consommation de carburant et de celui de  For this purpose, the invention relates to a piston of the above type, characterized in that the thermal insulation is only provided on the bottom of the piston and on the bottom of the combustion chamber. Since the thermal insulation is only provided at the bottom of the piston and at the bottom of the combustion chamber, the power loss of the internal combustion engine is reduced at the cooling of the parts. At the same time, for internal combustion engines made in such a way, there is no disadvantage in terms of higher consumption or higher or lower exhaust emission. This lies in the fact that the areas of the cavity forming the combustion chamber in the piston, areas in which the fuel injected into the cavity forming the combustion chamber arrives are not thermally insulated and therefore the heat thus generated is well evacuated to the cooler areas of the piston. It has been found that the temperatures of a thermally insulated piston according to the invention are lowered in the zone of the side walls of the combustion chamber to a level lower than that of a piston without thermal insulation. Thus, in addition to reduced cooling means, there are also advantages in terms of fuel consumption and that of

l'émission de produits nocifs.the emission of harmful products.

Suivant une autre caractéristique de l'invention, l'isolation thermique est une couche céramique réalisée par projection. Ainsi, cette isolation thermique est réalisée sous la forme d'une couche en matière céramique déposée par projection sur les zones 35 à isoler du piston. Pour une telle isolation thermique,  According to another characteristic of the invention, the thermal insulation is a ceramic layer produced by projection. Thus, this thermal insulation is made in the form of a layer of ceramic material deposited by spraying on the zones 35 to be isolated from the piston. For such thermal insulation,

il convient particulièrement bien d'avoir une couche projetée dont le composant chimique de base est ZrO2.  it is particularly appropriate to have a projected layer whose basic chemical component is ZrO2.

Une telle isolation projetée est en outre simple à mettre en oeuvre, car pour la projection, on recouvre avec des moyens simples les zones du piston qui ne sont pas à isoler, ce qui permet une isolation thermique sans  Such projected insulation is also simple to implement, because for the projection, it covers with simple means areas of the piston that are not to be insulated, which allows thermal insulation without

nécessiter ultérieurement un usinage coûteux.  subsequently require expensive machining.

Suivant un autre développement avantageux, l'isolation thermique est réalisée au fond de la 10 chambre de combustion et au fond du piston par une plaque massive en matière céramique. La plaque en matière céramique peut se fixer de manière simple au fond de la chambre de combustion en la serrant dans un logement réalisé dans le fond de-la chambre de combustion et qui corres15 pond à l'épaisseur de la plaque en matière céramique. La précontrainte par laquelle la plaque en matière céramique est maintenue est choisie de façon que cette plaque en matière céramique reste bloquée même aux températures de fonctionnement maximales autorisées et sous l'effet des dilatations engendrées par des coefficients de dilatation différents de la matière du piston et de la matière céramique. En variante ou de manière complémentaire à la fixation de la plaque en matière céramique assurée par  According to another advantageous development, the thermal insulation is carried out at the bottom of the combustion chamber and at the bottom of the piston by a solid plate of ceramic material. The ceramic plate can be easily attached to the bottom of the combustion chamber by clamping it in a recess in the bottom of the combustion chamber which corresponds to the thickness of the ceramic plate. The preloading by which the ceramic plate is held is chosen so that this ceramic plate remains locked even at the maximum permissible operating temperatures and under the effect of the expansions caused by expansion coefficients different from the material of the piston and ceramic material. Alternatively or in a manner complementary to the fixing of the ceramic material plate provided by

cette précontrainte, le logement réalisé dans le fond de 25 la chambre de combustion peut aller en diminuant en direction du fond du piston de manière à retenir une plaque en céramique adaptée de façon correspondante également par une liaison par la forme dans le fond de la chambre de combustion.  this prestressing, the housing made in the bottom of the combustion chamber can go down towards the bottom of the piston so as to retain a correspondingly adapted ceramic plate also by a connection by the shape in the bottom of the chamber of combustion.

Suivant un autre développement de l'invention, l'isolation thermique du fond du piston et du fond de la chambre de combustion est réalisée par un métal isolant. Un tel mode de réalisation offre l'avantage que les coefficients de dilatation du métal consti35 tuant le piston et le métal constituant l'isolant sont plus proches, ce qui simplifie les problèmes de fixation  According to another development of the invention, the thermal insulation of the bottom of the piston and the bottom of the combustion chamber is made by an insulating metal. Such an embodiment offers the advantage that the expansion coefficients of the metal constituting the piston and the metal constituting the insulator are closer, which simplifies the fixing problems.

engendrés par une dilatation thermique différente.  generated by a different thermal expansion.

Suivant une autre caractéristique de l'invention, l'isolation thermique est constituée par une plaque de céramique. 1+ Suivant une autre caractéristique de l'invention, l'isolation thermique est constituée par une plaque métallique. Ainsi, on réduite encore plus de manière avantageuse le flux de chaleur à transmettre en10 tre la plaque isolante en matière céramique ou en métal, entre la plaque isolante en matière céramique ou en métal et les zones de piston chaque fois recouvertes dans les parties o existe un intervalle d'air. Pour cela, il suffit d'un certain nombre de nervures formées sur le 15 piston ou la plaque isolante pour former l'intervalle d'air; ces nervures s'appuient sur la partie respectivement correspondante c'est-à-dire la plaque isolante ou le piston. Grâce à ces nervures, on protège la plaque  According to another characteristic of the invention, the thermal insulation is constituted by a ceramic plate. According to another characteristic of the invention, the thermal insulation is constituted by a metal plate. Thus, the heat flow to be transmitted between the insulating plate of ceramic material and of metal, between the ceramic or metal insulating plate and the piston zones which are each covered in the parts o, is further advantageously reduced. an air gap. For this, all that is required is a number of ribs formed on the piston or insulating plate to form the air gap; these ribs are based on the corresponding part respectively that is to say the insulating plate or the piston. Thanks to these ribs, we protect the plate

isolante contre les incidents en particulier des ruptures 20 engendrées par les pressions élevées au moment de la combustion.  insulation against incidents, particularly breaks caused by high pressures at the time of combustion.

Suivant une autre caractéristique de l'invention, pour l'isolation thermique du fond du piston et du fond de la chambre de combustion, on utilise une isolation différente comme défini ci-dessus. Il est particulièrement avantageux d'utiliser la combinaison suivante: un fond de piston isolé par une couche projetée de ZrO2 et un fond de chambre de combustion isolé par une plaque du type "ATI"encastrée dans un logement correspondant réalisé dans le fond de la chambre de combustion. Il est également avantageux d'isoler le fond du piston ou le fond de  According to another characteristic of the invention, for the thermal insulation of the bottom of the piston and the bottom of the combustion chamber, a different insulation is used as defined above. It is particularly advantageous to use the following combination: a piston bottom isolated by a projected layer of ZrO 2 and a combustion chamber bottom insulated by a plate of the "ATI" type embedded in a corresponding housing made in the bottom of the chamber of combustion. It is also advantageous to isolate the bottom of the piston or the bottom of

la chambre de combustion à l'aide d'une plaque isolante métallique qui est munie d'une couche de matière céramique projetée au moins sur sa face soumise a l'action des 35 gaz de combustion.  the combustion chamber using a metal insulating plate which is provided with a layer of ceramic material projected at least on its face subjected to the action of the combustion gases.

L'isolation thermique décrite cidessus s'applique de manière avantageuse dans le cas de tous les pistons ayant des chambres de combustion en forme de pots; on obtient des résultats particulière5 ment intéressants sur le plan de la réduction des moyens de refroidissement à mettre en oeuvre et sur le plan de la réduction des températures des pièces du piston et de la chemise avec simultanément une réduction de la consommation de carburant et une amélioration de l'émission des O10 gaz d'échappement dans le cas de moteurs à combustion interne à injection directe, à auto- allumage, fonctionnant selon le procédé de tourbillonnement. Du fait que l'isolation thermique du fond du piston et du fond de la chambre de combustion, les bords de la cavité formant la chambre de combustion ne sont pas échauffés autant que dans le cas d'une isolation complète, on réduit en outre de manière considérable le risque de formation de  The thermal insulation described above advantageously applies in the case of all pistons having combustion chambers in the form of pots; Particularly interesting results are obtained in terms of reducing the cooling means to be used and in terms of reducing the temperatures of the piston pieces and the jacket with a simultaneous reduction of the fuel consumption and an improvement. the emission of O10 exhaust gases in the case of internal combustion engines with direct injection, self-igniting, operating according to the swirling process. Because the thermal insulation of the bottom of the piston and the bottom of the combustion chamber, the edges of the cavity forming the combustion chamber are not heated as much as in the case of complete insulation, it is further reduced by considerably the risk of formation of

fissures ou de criques dans cette zone.  cracks or cracks in this area.

Un exemple de réalisation de 20 l'invention est représenté dans l'unique figure  An exemplary embodiment of the invention is shown in the single FIGURE

qui est une coupe axiale d'un piston selon l'invention.  which is an axial section of a piston according to the invention.

Le piston 1 est conçu pour un moteur à combustion interne à auto-allumage à injection directe, 25 fonctionnant selon le procédé de tourbillonnement. Le piston 1 est habituellement monté sur une bielle par l'intermédiaire d'un goujon placé dans l'alésage 2 et coopérant avec l'alésage de la bielle. Les gorges annulaires 4 et 5 reçoivent des segments d'étanchéité alors que la 30 gorge 3 reçoit un segment de raclage d'huile. Le piston  The piston 1 is designed for a direct injection self-igniting internal combustion engine operating according to the swirling method. The piston 1 is usually mounted on a connecting rod by means of a stud placed in the bore 2 and cooperating with the bore of the connecting rod. The annular grooves 4 and 5 receive sealing segments while the groove 3 receives an oil scraper segment. The piston

1 est de préférence réalisé en un alliage d'aluminium.  1 is preferably made of an aluminum alloy.

Au milieu du fond 6 du piston, il est prévu une chambre de combustion 7 en forme de pot, disposée de manière symétrique par rapport à l'axe du piston 1. Le fond 8 de la chambre de combustion est bombé & de manière légèrement concave et passe avec un rayon de courbure transitoire 9 doux dans la paroi latérale 10 de la chambre de combustion. Le diamètre de la chambre de combustion 7 augmente à partir du diamètre déterminé par le point de transition entre le rayon de transition 9 vers la paroi latérale 10 jusque vers l'extrémité de la paroi latérale 10 de la chambre de combustion située du  In the middle of the bottom 6 of the piston, there is provided a combustion chamber 7 in the form of a pot, arranged symmetrically with respect to the axis of the piston 1. The bottom 8 of the combustion chamber is curved & slightly concave and passes with a gentle transient bending radius 9 into the side wall 10 of the combustion chamber. The diameter of the combustion chamber 7 increases from the diameter determined by the transition point between the transition radius 9 to the side wall 10 to the end of the side wall 10 of the combustion chamber located from

côté du fond du piston, suivant une progression continue.  side of the bottom of the piston, following a continuous progression.

La transition 11 présente une arête vive entre la paroi 10 latérale 10 de la chambre de combustion et le fond 6 du piston. Le fond 6 du piston est isolé thermiquement; cette isolation thermique est réalisée sous la forme d'une couche en matière céramique 12, déposée par projection. Dans l'exemple de réalisation, la couche de matière 15 céramique projetée 12 est en ZrO2. Le fond 8 de la chambre de combustion comporte un logement 13 pratiquement circulaire. Une plaque d'isolation thermique est fixée dans ce logement 13; dans l'exemple de réalisation, cette plaque d'isolation thermique est une plaque 14 en 20 matière céramique. La plaque 14 est maintenue dans le logement 13 à la fois par une liaison par la forme et  The transition 11 has a sharp edge between the side wall 10 of the combustion chamber and the bottom 6 of the piston. The bottom 6 of the piston is thermally insulated; this thermal insulation is made in the form of a layer of ceramic material 12 deposited by projection. In the exemplary embodiment, the projected ceramic material layer 12 is ZrO 2. The bottom 8 of the combustion chamber has a substantially circular housing 13. A thermal insulation plate is fixed in this housing 13; in the exemplary embodiment, this thermal insulation plate is a plate 14 made of ceramic material. The plate 14 is held in the housing 13 both by a connection by the shape and

une liaison par la force.a bond by force.

2596 1 042596 1 04

Claims (4)

R E V E N D I C A T I 0 N SR E V E N D I C A T I 0 N S 1 ) Piston (1) comportant une chambre de combustion (7) intégrée en forme de pot dans le fond (6) du piston applicable à un moteur à combustion interne à auto-allumage, le piston (1) étant isolé en partie thermiquement du côté de la tête de cylindre, piston caractérisé en ce que l'isolation thermique est uniquement prévue sur le fond (6) du piston et sur le  1) Piston (1) having an integrated combustion chamber (7) in the form of a pot in the bottom (6) of the piston applicable to a self-igniting internal combustion engine, the piston (1) being insulated in part thermally from side of the cylinder head, piston characterized in that the thermal insulation is only provided on the bottom (6) of the piston and on the fond (8) de la chambre de combustion.  bottom (8) of the combustion chamber. -2 ) Piston (1) selon la revendication 1, caractérisé en ce que l'isolation thermique est une  -2) Piston (1) according to claim 1, characterized in that the thermal insulation is a couche céramique (12) réalisée par projection.  ceramic layer (12) made by projection. 3 ) Piston (1) selon la revendication 1, caractérisé en ce que l'isolation thermique est cons15 tituée par une plaque de céramique (14).  3) Piston (1) according to claim 1, characterized in that the thermal insulation is constituted by a ceramic plate (14). 4 ) Piston (1) selon la revendication 1, caractérisé en ce que l'isolation thermique est constituée par une plaque métallique.  4) Piston (1) according to claim 1, characterized in that the thermal insulation is constituted by a metal plate. ) Piston (1) selon l'une quelcon20 que des revendications 3 et 4, caractérisé en ce qu'entre   Piston (1) according to any one of claims 3 and 4, characterized in that le matériau constituant le piston et la plaque d'isolation, il comporte un intervalle d'air suivant des segments partiels. 6 ) Piston (1) selon la revendication 25 1, caractérisé en ce que pour l'isolation thermique du fond (6) du piston et du fond (8) de la chambre de combustion, il comporte une combinaison formée d'une isolation  the material constituting the piston and the insulating plate, it comprises an air gap along partial segments. 6) Piston (1) according to claim 25 1, characterized in that for the thermal insulation of the bottom (6) of the piston and the bottom (8) of the combustion chamber, it comprises a combination formed of an insulation thermique selon l'une quelconque des revendications 2 à 5.  thermal device according to any one of claims 2 to 5.
FR878703731A 1986-03-22 1987-03-18 THERMAL INSULATION PISTON, PARTICULARLY FOR SELF-IGNITION ENGINES Expired - Fee Related FR2596104B1 (en)

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DE19863609752 DE3609752A1 (en) 1986-03-22 1986-03-22 THERMALLY INSULATED PISTON

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DE19952868B4 (en) * 1999-11-03 2005-03-17 Ks Kolbenschmidt Gmbh Piston and piston assembly
GB0909585D0 (en) * 2009-05-20 2009-07-15 Bayram Peter J Improvements to 2 & 4-stroke internal combustion engine pistons
JP6232954B2 (en) * 2013-11-12 2017-11-22 トヨタ自動車株式会社 Internal combustion engine
WO2018185847A1 (en) * 2017-04-04 2018-10-11 日産自動車株式会社 Piston

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JPS60182341A (en) * 1984-02-29 1985-09-17 Isuzu Motors Ltd Internal-combustion engine covering combustion chamber wall surface with porous heat insulating material
JPS60240854A (en) * 1984-05-15 1985-11-29 Toyota Motor Corp Piston for internal-combustion engine made of light metal
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JPS60240854A (en) * 1984-05-15 1985-11-29 Toyota Motor Corp Piston for internal-combustion engine made of light metal
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PATENT ABSTRACTS OF JAPAN, vol. 10, no. 25 (M-450)[2082], 31 janvier 1986; & JP-A-60 182 341 (ISUZU JIDOSHA K.K.) 17-09-1985 *

Also Published As

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FR2596104B1 (en) 1990-05-25
DE3609752A1 (en) 1987-10-01
GB2188123A (en) 1987-09-23
GB8706659D0 (en) 1987-04-23
DE3609752C2 (en) 1989-06-22
GB2188123B (en) 1989-11-15

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