EP2032827A1 - Exhaust device comprising a cylinder head with a thermally decoupled integrated exhaust manifold - Google Patents

Exhaust device comprising a cylinder head with a thermally decoupled integrated exhaust manifold

Info

Publication number
EP2032827A1
EP2032827A1 EP07788989A EP07788989A EP2032827A1 EP 2032827 A1 EP2032827 A1 EP 2032827A1 EP 07788989 A EP07788989 A EP 07788989A EP 07788989 A EP07788989 A EP 07788989A EP 2032827 A1 EP2032827 A1 EP 2032827A1
Authority
EP
European Patent Office
Prior art keywords
cylinder head
exhaust
cavity
bore
engine
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
EP07788989A
Other languages
German (de)
French (fr)
Other versions
EP2032827B1 (en
Inventor
Eric Dumas
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 SAS
Original Assignee
Renault SAS
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 SAS filed Critical Renault SAS
Publication of EP2032827A1 publication Critical patent/EP2032827A1/en
Application granted granted Critical
Publication of EP2032827B1 publication Critical patent/EP2032827B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds
    • F01N13/102—Other arrangements or adaptations of exhaust conduits of exhaust manifolds having thermal insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • F01N13/141—Double-walled exhaust pipes or housings
    • F01N13/143—Double-walled exhaust pipes or housings with air filling the space between both walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/16—Selection of particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/243—Cylinder heads and inlet or exhaust manifolds integrally cast together
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4264—Shape or arrangement of intake or exhaust channels in cylinder heads of exhaust channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
    • F01N13/1844—Mechanical joints
    • F01N13/185—Mechanical joints the connection being realised by deforming housing, tube, baffle, plate, or parts thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4264—Shape or arrangement of intake or exhaust channels in cylinder heads of exhaust channels
    • F02F2001/4278—Exhaust collectors

Definitions

  • the invention relates to an exhaust system for a multi-cylinder internal combustion engine of a motor vehicle comprising a cylinder head of said engine in which exhaust pipes are arranged, a first end of each of which is connected to a combustion chamber of said engine. and whose second end opens into a cavity or plenum of an exhaust manifold integrated in the cylinder head, an outlet pipe is connected externally to a device for cleaning the exhaust gases of a vehicle exhaust line.
  • the exhaust devices comprise exhaust ducts formed in the cylinder head of the engine which coincide with collector ducts arranged opposite the exhaust ducts.
  • the collector comprises at least one outlet duct which is connected to an exhaust line of the motor vehicle.
  • Document DE-A-3.81 5.408 describes a collector integrally formed in the breech and coming from a foundry therewith.
  • the invention proposes a device of the type described above comprising a collector integrated in the cylinder head of the motor and mu and thermal decoupling means with respect to said cu lasse.
  • the invention proposes a collector of the type described above, characterized in that characterized in that the cavity or plenum of the collector is formed in an element attached to the lower part of the yoke and that said The element is thermally decoupled from the battery by the intermediary of thermal decoupling means.
  • the second ends of the exhaust ducts open into a receiving bore formed in the casing which receives a tubular insert which is attached to the inside of the bowl to form the insert, which comprises com munication ports with the second ends of the exhaust ducts, and which has the outlet duct opening out to the outside of the cu lasse.
  • the tubular insert is made of stainless steel, the tubular insert is mounted without clearance in the receiving bore of the casing,
  • the thermal decoupling means are arranged in the cylinder head around the tubular section and at least between two consecutive exhaust ducts; the thermal decoupling means comprise at least one cavity which is formed in the material of the cu lasse around the receiving bore and which opens into said bore, the device comprises a cavity which is arranged around the receiving bore between each pair of consecutive exhaust pipes, and a cavity which is arranged around the receiving bore between an end exhaust pipe and a outer end face of the bolt,
  • FIG. 1 shows a cylinder head 10 for an exhaust device produced according to the invention.
  • exhaust ducts 1 2 are arranged in the cylinder head 10.
  • a first end 14 of each duct 1 2 is connected to a combustion chamber 1 6 of the engine and the second end 1 8 of each duct 12 opens into a cavity 20 or plenum of an exhaust manifold 22 integrated with the cylinder head 10.
  • An outlet pipe 24 of the manifold 22 is connected externally to a device (not shown) for cleaning up the exhaust gases of a line of exhaust (not shown) of the vehicle.
  • the cylinder head 10 comprises between each combustion chamber 16 cavities 30 for circulating a coolant of the engine.
  • the cavity 20 or plenum m collector 22 is formed in an element 26 which is attached to the inside of the cylinder head 10 and said element 26 is thermally decoupled from the cylinder head 1 0 via means 28 for thermal decoupling. More particularly, the second ends 18 of the exhaust ducts 1 2 open into a receiving bore 32 which is formed in the tub 10, and this bore 32 receives a tubular insert 26 forming the attached element 26. which is attached to the inside of the cu lasse, which has orifices 34 communication with the second ends 1 8 exhaust ducts 12, and which has the outlet conduit 24 opening out of the cylinder head 1 0.
  • the tubular insert 26 is made of stainless steel, because this material has thermal expansion characteristics to ensure a satisfactory seal when connected to the depollution device, regardless of its temperature. It should be noted that this characteristic is not limiting of the invention, and that any other material having similar characteristics could be used for the proper implementation of the invention.
  • the tubular insert 26 is mounted without play in the bore 32 for receiving the cylinder head 10.
  • the tubular insert 26 is for example fitted into the bore 32 according to a type adjustment tight.
  • the thermal decoupling means 28 are arranged in the cylinder head around the tubular insert 26 and at least between two consecutive exhaust ducts 12.
  • the thermal decoupling means 28 comprise at least one cavity 28 which is formed in the material of the yoke 10 around the receiving bore 32, and which opens into said bore 32. This cavity is filled with air and thus allows a thermal decoupling of the insert 26 with respect to the cylinder head, avoiding that the heat of the cylinder head 1 0 is communicated to the insert 26 by conduction.
  • the device comprises a cavity 28 which is arranged around the receiving bore 32 between each pair of consecutive exhaust pipes 1 2, and a cavity 28 which is arranged around the receiving bore 32 between an end exhaust pipe 12 and an end outer face 36 of the cylinder head 10.
  • each cavity 28 is made during the molding of the cylinder head 10.
  • the invention therefore makes it possible to benefit from a device comprising a manifold 26 attached to the cylinder head 1 0 as close as possible to the combustion chambers 12, which makes it possible to optimize the performance of a pollution control device connected to its outlet duct. 24, and which is free from the disadvantages of integrated collectors known from the state of the art due to its thermal decoupling vis-à-vis the cylinder head 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

An exhaust device for a motor vehicle multi-cylinder internal combustion engine including a cylinder head of the engine in which there are exhaust ducts, a first end of each of which is connected to a combustion chamber of the engine and a second end of which opens into a cavity or plenum of an exhausted manifold integrated into the cylinder head of which an outlet duct is externally connected to a device for removing contamination from the exhaust gases of an exhaust line of the vehicle. The cavity or plenum of the manifold is formed in an element attached inside the cylinder head, and the element is thermally decoupled from the cylinder head using a thermal decoupling mechanism.

Description

DISPOSITIF D'ECHAPPEMENT COMPORTANT UNE CULASSE EXHAUST DEVICE COMPRISING A CYLINDER HEAD
MUNIE D'UN COLLECTEUR D'ECHAPPEMENT INTEGREHAVING AN INTEGRATED EXHAUST MANIFOLD
DECOUPLE THERMIQUEMENTTHERMALLY DECOUPLE
L'invention concerne un dispositif d'échappement pour un moteur à combustion interne multicylindre d'un véhicule automobile comportant une culasse dudit moteur dans laquelle sont agencés des conduits d'échappement dont une première extrémité de chacun est reliée à une chambre de combustion dudit moteur et dont la seconde extrémité débouche dans une cavité ou plénum d'un collecteur d'échappement intégré à la culasse dont un conduit de sortie est relié extérieurement à un dispositif de dépollution des gaz d'échappement d'une ligne d'échappement du véhicule.The invention relates to an exhaust system for a multi-cylinder internal combustion engine of a motor vehicle comprising a cylinder head of said engine in which exhaust pipes are arranged, a first end of each of which is connected to a combustion chamber of said engine. and whose second end opens into a cavity or plenum of an exhaust manifold integrated in the cylinder head, an outlet pipe is connected externally to a device for cleaning the exhaust gases of a vehicle exhaust line.
On connaît de nombreux exemples de dispositifs de ce type. Conventionnellement, les dispositifs d'échappement comportent des conduits d'échappement formés dans la culasse du moteur qui coïncident avec des conduits du collecteur agencés en regard des conduits d'échappement. Le collecteur comporte au moins un conduit de sortie qui est relié à une ligne d'échappement du véhicule automobile.Numerous examples of devices of this type are known. Conventionally, the exhaust devices comprise exhaust ducts formed in the cylinder head of the engine which coincide with collector ducts arranged opposite the exhaust ducts. The collector comprises at least one outlet duct which is connected to an exhaust line of the motor vehicle.
Dans le but de diminuer la teneur en produits polluants contenus dans les gaz de combustion, il est connu d'implanter dans la ligne d'échappement des dispositifs de dépollution, notamment des catalyseurs, qui permettent de convertir les produits polluants présents dans les gaz de combustion, notamment les hydrocarbures imbrûlés HC et les oxydes d'azote NOx.In order to reduce the content of pollutants contained in the flue gases, it is known to install in the exhaust line pollution control devices, in particular catalysts, which make it possible to convert the pollutants present in the exhaust gases. combustion, including HC unburnt hydrocarbons and NOx nitrogen oxides.
Or, un problème se pose lors des phases de démarrage à froid du moteur. En effet, l'efficacité des dispositifs de dépollution est fortement tributaire de leur température de fonctionnement. L'éloignement de ces dispositifs des chambres de combustion du moteur retarde leur montée en température pendant les premières minutes de fonctionnement du moteur, et réduit leur efficacité alors même que c'est pendant ces premières minutes de fonctionnement du moteur que la plus grande quantité de polluants est émise.However, a problem arises during the cold start phases of the engine. Indeed, the effectiveness of the depollution devices is highly dependent on their operating temperature. The distance of these devices from the combustion chambers of the engine delays their rise in temperature during the first minutes of operation of the engine, and reduces their effectiveness. even though it is during these first minutes of operation of the engine that the largest amount of pollutants is emitted.
Pour remédier à cet inconvénient, on a proposé de réaliser des collecteurs d'échappement qui sont partiellement ou totalement intégrés à la culasse du moteur, ce qui permet de réduire considérablement la distance entre les chambres de combustion et le dispositif de dépollution, qui est alors directement accolé à la culasse en sortie du collecteur. Le document FR-2.738.289 décrit notamment un collecteur de ce type, dont les conduits d'échappement de la culasse débouchent dans une cavité ou plénum, formée pour moitié dans le collecteur et pour moitié dans la culasse.To overcome this drawback, it has been proposed to make exhaust manifolds that are partially or totally integrated with the engine cylinder head, which considerably reduces the distance between the combustion chambers and the pollution control device, which is then directly attached to the breech at the exit of the collector. The document FR-2.738.289 describes in particular a manifold of this type, the exhaust ducts of the cylinder head open into a cavity or plenum, formed half in the collector and half in the cylinder head.
Le document DE-A-3.81 5.408 décrit quand à lui un collecteur formé intégralement dans la culasse et venu de fonderie avec celle-ci.Document DE-A-3.81 5.408 describes a collector integrally formed in the breech and coming from a foundry therewith.
Ces collecteurs connus de l'état de la technique posent toutefois de nombreux problèmes.These collectors known from the state of the art, however, pose many problems.
En effet, lorsqu'un collecteur de ce type n'est que partiellement formé dans la culasse, la distance entre les chambres de combustion et le dispositif de dépollution n'est pas réduite au minimum, et de ce fait l'efficacité du dispositif de dépollution n'est pas totale.Indeed, when a collector of this type is only partially formed in the cylinder head, the distance between the combustion chambers and the pollution control device is not reduced to a minimum, and therefore the effectiveness of the device of depollution is not total.
Par ailleurs, lorsque le collecteur est intégré à la culasse, il est soumis à des contraintes de températures élevées et se trouve donc, comme le matériau de la culasse, sujet à une importante dilatation au fur et à mesure de sa montée en température. De ce fait, il est pratiquement impossible d'accoupler un tel collecteur au reste de la ligne d'échappement si il n'est pas pourvu de cavités de refroidissement reliées aux cavités de circulation de liquide de refroidissement de la culasse.Furthermore, when the manifold is integrated in the cylinder head, it is subjected to high temperature constraints and is therefore, as the material of the cylinder head, subject to significant expansion as its temperature rise. Therefore, it is almost impossible to couple such a collector to the rest of the exhaust line if it is not provided with cooling cavities connected to the coolant circulation cavities of the cylinder head.
Cette conception pénalise alors d'une part le rendement su moteur puisqu'elle est synonyme d'abaissement du rendement thermique du moteur du fait de la nécessité de refroidir le collecteur, et d'autre part réduit considérablement les bénéfices du rapprochement du collecteur et des chambres de combustion, le refroidissement du collecteu r ne permettant alors plus sa montée rapide en température propre à améliorer l'efficacité du dispositif de dépollution .This design penalizes on the one hand the engine efficiency since it is synonymous with lowering the thermal efficiency of the engine because of the need to cool the engine. collector, and on the other hand greatly reduces the benefits of the approximation of the collector and combustion chambers, the collector cooling then no longer allowing its rapid rise in temperature to improve the efficiency of the depollution device.
Pour remédier à cet i nconvénient, l'invention propose dispositif du type décrit précédemment comportant un collecteu r i ntégré à la culasse du moteu r et mu ni de moyens de découplage thermique par rapport à ladite cu lasse. Dans ce but, l'invention propose u n collecteur du type décrit précédem ment, caractérisé en ce que caractérisé en ce que la cavité ou plénum du collecteu r est formée dans un élément rapporté à l'i ntérieu r de la culasse et ce que ledit élément est découplé thermiquement de la cu lasse par l'i ntermédiai re de moyens de découplage thermique.To overcome this disadvantage, the invention proposes a device of the type described above comprising a collector integrated in the cylinder head of the motor and mu and thermal decoupling means with respect to said cu lasse. For this purpose, the invention proposes a collector of the type described above, characterized in that characterized in that the cavity or plenum of the collector is formed in an element attached to the lower part of the yoke and that said The element is thermally decoupled from the battery by the intermediary of thermal decoupling means.
Selon d'autres caractéristiques de l'i nvention :According to other features of the invention,
- les secondes extrémités des conduits d'échappement débouchent dans u n alésage de réception formé dans la cu lasse qui reçoit un i nsert tubu lai re qui est rapporté à l'i ntérieur de la cu lasse pour former l'élément rapporté, qui comporte des orifices de com mu nication avec les secondes extrémités des conduits d'échappement, et qui comporte le conduit de sortie débouchant à l'extérieu r de la cu lasse.the second ends of the exhaust ducts open into a receiving bore formed in the casing which receives a tubular insert which is attached to the inside of the bowl to form the insert, which comprises com munication ports with the second ends of the exhaust ducts, and which has the outlet duct opening out to the outside of the cu lasse.
- l'insert tubulaire est réalisé en acier i noxydable, - l'i nsert tubulai re est monté sans jeu dans l'alésage de réception de la cu lasse,the tubular insert is made of stainless steel, the tubular insert is mounted without clearance in the receiving bore of the casing,
- les moyens de découplage thermique sont agencés dans la culasse autour de l'i nsert tubulaire et au moi ns entre deux conduits d'échappement consécutifs, - les moyens de découplage thermique comportent au moi ns une cavité qui est formée dans le matériau de la cu lasse autour de l'alésage de réception et qui débouche dans ledit alésage, - le dispositif comporte une cavité qui est agencée autour de l'alésage de réception entre chaque paire de conduits d'échappement consécutifs, et une cavité qui est agencée autour de l'alésage de réception entre un conduit d'échappement d'extrémité et une face extérieure d'extrémité de la culasse,the thermal decoupling means are arranged in the cylinder head around the tubular section and at least between two consecutive exhaust ducts; the thermal decoupling means comprise at least one cavity which is formed in the material of the cu lasse around the receiving bore and which opens into said bore, the device comprises a cavity which is arranged around the receiving bore between each pair of consecutive exhaust pipes, and a cavity which is arranged around the receiving bore between an end exhaust pipe and a outer end face of the bolt,
- chaque cavité est réalisée lors du moulage de la culasse. D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui suit pour la compréhension de laquelle on se reportera au dessin annexé dans lequel la figure unique est une vue schématique d'une culasse pour un dispositif d'échappement selon l'invention.- Each cavity is made during the molding of the cylinder head. Other features and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended drawing in which the single figure is a schematic view of a cylinder head for an exhaust system according to the invention.
On a représenté sur la figu re unique une culasse 1 0 pour un dispositif d'échappement réalisé selon l'invention.FIG. 1 shows a cylinder head 10 for an exhaust device produced according to the invention.
De manière connue, des conduits d'échappement 1 2 sont agencés dans la culasse 10. Une première extrémité 14 de chaque conduit 1 2 est reliée à une chambre 1 6 de combustion du moteur et la seconde extrémité 1 8 de chaque conduit 12 débouche dans une cavité 20 ou plénum d'un collecteur 22 d'échappement intégré à la culasse 10. Un conduit 24 de sortie du collecteur 22 est relié extérieurement à un dispositif (non représenté) de dépollution des gaz d'échappement d'une ligne d'échappement (non représentée) du véhicule. La culasse 1 0 comporte entre chaque chambre de combustion 16 des cavités 30 de circulation d'un liquide de refroidissement du moteur. Conformément à l'i nvention , la cavité 20 ou plénu m du collecteur 22 est formée dans un élément 26 qui est rapporté à l'intérieur de la culasse 10 et ledit élément 26 est découplé thermiquement de la culasse 1 0 par l'intermédiaire de moyens 28 de découplage thermique. Plus particu lièrement, les secondes extrémités 1 8 des conduits 1 2 d'échappement débouchent dans un alésage 32 de réception qui est formé dans la cu lasse 1 0. Cet alésage 32 qui reçoit un i nsert tubulai re 26 formant l'élément 26 rapporté qui est rapporté à l'i ntérieur de la cu lasse, qui comporte des orifices 34 de communication avec les secondes extrémités 1 8 des conduits 12 d'échappement, et qui comporte le conduit 24 de sortie débouchant à l'extérieur de la culasse 1 0.In known manner, exhaust ducts 1 2 are arranged in the cylinder head 10. A first end 14 of each duct 1 2 is connected to a combustion chamber 1 6 of the engine and the second end 1 8 of each duct 12 opens into a cavity 20 or plenum of an exhaust manifold 22 integrated with the cylinder head 10. An outlet pipe 24 of the manifold 22 is connected externally to a device (not shown) for cleaning up the exhaust gases of a line of exhaust (not shown) of the vehicle. The cylinder head 10 comprises between each combustion chamber 16 cavities 30 for circulating a coolant of the engine. In accordance with the invention, the cavity 20 or plenum m collector 22 is formed in an element 26 which is attached to the inside of the cylinder head 10 and said element 26 is thermally decoupled from the cylinder head 1 0 via means 28 for thermal decoupling. More particularly, the second ends 18 of the exhaust ducts 1 2 open into a receiving bore 32 which is formed in the tub 10, and this bore 32 receives a tubular insert 26 forming the attached element 26. which is attached to the inside of the cu lasse, which has orifices 34 communication with the second ends 1 8 exhaust ducts 12, and which has the outlet conduit 24 opening out of the cylinder head 1 0.
Dans le mode de réalisation, l'insert tubulaire 26 est réalisé en acier inoxydable, car ce matériau présente des caractéristiques de dilatation thermique propres à garantir une étanchéité satisfaisante lorsqu'il est raccordé à au dispositif de dépollution, quelle que soit sa température. I l conviendra de noter que cette caractéristique n'est pas limitative de l'invention, et que tout autre matériau présentant des caractéristiques analogues pourrait être employé pour la bonne mise en œuvre de l'invention.In the embodiment, the tubular insert 26 is made of stainless steel, because this material has thermal expansion characteristics to ensure a satisfactory seal when connected to the depollution device, regardless of its temperature. It should be noted that this characteristic is not limiting of the invention, and that any other material having similar characteristics could be used for the proper implementation of the invention.
Dans le mode réalisation préféré de l'invention, l'insert tubulaire 26 est monté sans jeu dans l'alésage 32 de réception de la culasse 10. L'insert tubulaire 26 est par exemple emmanché dans l'alésage 32 suivant un ajustement de type serré.In the preferred embodiment of the invention, the tubular insert 26 is mounted without play in the bore 32 for receiving the cylinder head 10. The tubular insert 26 is for example fitted into the bore 32 according to a type adjustment tight.
Avantageusement, les moyens 28 de découplage thermique sont agencés dans la culasse autour de l'insert 26 tubulaire et au moins entre deux conduits 12 d'échappement consécutifs.Advantageously, the thermal decoupling means 28 are arranged in the cylinder head around the tubular insert 26 and at least between two consecutive exhaust ducts 12.
Plus particulièrement, les moyens 28 de découplage thermique comportent au moins une cavité 28 qui est formée dans le matériau de la culasse 10 autour de l'alésage 32 de réception, et qui débouche dans ledit alésage 32. Cette cavité est remplie d'air et permet donc un découplage thermique de l'insert 26 par rapport à la culasse, en évitant que la chaleur de la culasse 1 0 ne se communique à l'insert 26 par conduction.More particularly, the thermal decoupling means 28 comprise at least one cavity 28 which is formed in the material of the yoke 10 around the receiving bore 32, and which opens into said bore 32. This cavity is filled with air and thus allows a thermal decoupling of the insert 26 with respect to the cylinder head, avoiding that the heat of the cylinder head 1 0 is communicated to the insert 26 by conduction.
De préférence, comme l'illustre la figure unique, le dispositif comporte une cavité 28 qui est agencée autour de l'alésage 32 de réception entre chaque paire de conduits 1 2 d'échappement consécutifs, et une cavité 28 qui est agencée autour de l'alésage 32 de réception entre un conduit 12 d'échappement d'extrémité et une face extérieure 36 d'extrémité de la culasse 10.Preferably, as shown in the single figure, the device comprises a cavity 28 which is arranged around the receiving bore 32 between each pair of consecutive exhaust pipes 1 2, and a cavity 28 which is arranged around the receiving bore 32 between an end exhaust pipe 12 and an end outer face 36 of the cylinder head 10.
Tout procédé de réalisation peut être utilisé pour la bonne réalisation des cavités 28. Toutefois, dans le mode de réalisation préféré de l'invention chaque cavité 28 est réalisée lors du moulage de la culasse 10.Any method of realization can be used for the good realization of cavities 28. However, in the embodiment preferred embodiment of the invention each cavity 28 is made during the molding of the cylinder head 10.
L'invention permet donc de bénéficier d'un dispositif comportant un collecteur 26 rapporté dans la culasse 1 0 au plus près des chambres de combustion 12, ce qui permet d'optimiser les performances d'un dispositif de dépollution relié à son conduit de sortie 24, et qui est exempt des inconvénients des collecteurs intégrés connus de l'état de la technique du fait de son découplage thermique vis-à-vis de la culasse 10. The invention therefore makes it possible to benefit from a device comprising a manifold 26 attached to the cylinder head 1 0 as close as possible to the combustion chambers 12, which makes it possible to optimize the performance of a pollution control device connected to its outlet duct. 24, and which is free from the disadvantages of integrated collectors known from the state of the art due to its thermal decoupling vis-à-vis the cylinder head 10.

Claims

REVENDICATIONS
1. Dispositif d'échappement pour moteur à combustion interne multicylindre d'un véhicule automobile comportant une culasse (10) dudit moteur dans laquelle sont agencés des conduits (12) d'échappement dont une première extrémité (14) de chacun est reliée à une chambre (16) de combustion dudit moteur et dont la seconde extrémité (18) débouche dans une cavité ou plénum (20) d'un collecteur d'échappement (22) intégré à la culasse (10) dont un conduit (24) de sortie est relié extérieurement à un dispositif de dépollution des gaz d'échappement d'une ligne d'échappement du véhicule, du type dans lequel la cavité (20) ou plénum du collecteur (20) est formée dans un élément (26) rapporté à l'intérieur de la culasse (10) et ce que ledit élément (26) est découplé thermiquement de la culasse (10) par l'intermédiaire de moyens (28) de découplage thermique, caractérisé en ce que les secondes extrémités (18) des conduits d'échappement (12) débouchent dans un alésage (32) de réception formé dans la culasse (10) qui reçoit un insert (26) tubulaire qui est rapporté à l'intérieur de la culasse (10) pour former l'élément (26) rapporté, qui comporte des orifices (34) de communication avec les secondes extrémités (18) des conduits d'échappement (12), et qui comporte le conduit (24) de sortie débouchant à l'extérieur de la culasse (10). An exhaust system for a multi-cylinder internal combustion engine of a motor vehicle comprising a cylinder head (10) of said engine in which exhaust pipes (12) are arranged, one end (14) of each of which is connected to a combustion chamber (16) of said engine and whose second end (18) opens into a cavity or plenum (20) of an exhaust manifold (22) integrated with the cylinder head (10), including an outlet duct (24) is connected externally to a device for the depollution of the exhaust gases of a vehicle exhaust line, of the type in which the cavity (20) or plenum of the collector (20) is formed in an element (26) connected to the the interior of the cylinder head (10) and that said element (26) is thermally decoupled from the cylinder head (10) via thermal decoupling means (28), characterized in that the second ends (18) of the pipes exhaust (12) open in a receiving bore (32) formed in the yoke (10) which receives a tubular insert (26) which is attached to the inside of the yoke (10) to form the insert (26), which has orifices ( 34) communicating with the second ends (18) of the exhaust ducts (12), and which has the outlet duct (24) opening out of the cylinder head (10).
2. Dispositif d'échappement selon la revendication précédente, caractérisé en ce que l'insert tubulaire (26) est réalisé en acier inoxydable.2. Exhaust device according to the preceding claim, characterized in that the tubular insert (26) is made of stainless steel.
3. Dispositif d'échappement selon l'une des revendications 1 ou 2, caractérisé en ce que l'insert tubulaire (26) est monté sans jeu dans l'alésage (32) de réception de la culasse (10).3. Exhaust device according to one of claims 1 or 2, characterized in that the tubular insert (26) is mounted without play in the bore (32) for receiving the cylinder head (10).
4. Dispositif d'échappement selon la revendication précédente, caractérisé en ce que les moyens (28) de découplage thermique sont agencés dans la culasse (10) autour de l'insert (26) tubulaire et au moins entre deux conduits (12) d'échappement consécutifs.4. Exhaust device according to the preceding claim, characterized in that the means (28) for thermal decoupling are arranged in the cylinder head (10) around the insert (26) tubular and at least between two consecutive exhaust ducts (12).
5. Dispositif d'échappement selon la revendication précédente, caractérisé en ce que les moyens (28) de découplage thermique comportent au moins une cavité (28) qui est formée dans le matériau de la culasse (1 0) autour de l'alésage (32) de réception et qui débouche dans ledit alésage (32).5. Exhaust device according to the preceding claim, characterized in that the means (28) for thermal decoupling comprise at least one cavity (28) which is formed in the material of the cylinder head (1 0) around the bore ( 32) and which opens into said bore (32).
6. Dispositif d'échappement selon la revendication précédente, caractérisé en ce qu'il comporte une cavité (28) qui est agencée autour de l'alésage (32) de réception entre chaque paire de conduits (12) d'échappement consécutifs, et une cavité (28) qui est agencée autour de l'alésage (32) de réception entre un conduit (1 2) d'échappement d'extrémité et une face extérieure (36) d'extrémité de la culasse (10). 6. Exhaust device according to the preceding claim, characterized in that it comprises a cavity (28) which is arranged around the bore (32) for receiving between each pair of consecutive exhaust ducts (12), and a cavity (28) which is arranged around the receiving bore (32) between an end exhaust pipe (1 2) and an end outer face (36) of the cylinder head (10).
7. Dispositif d'échappement selon l'une des revendications7. Exhaust device according to one of the claims
5 ou 6, caractérisé en ce que chaque cavité (28) est réalisée lors du moulage de la culasse (10). 5 or 6, characterized in that each cavity (28) is made during molding of the cylinder head (10).
EP07788989A 2006-06-23 2007-06-12 Exhaust device comprising a cylinder head with a thermally decoupled integrated exhaust manifold Active EP2032827B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0652631A FR2902827B1 (en) 2006-06-23 2006-06-23 EXHAUST DEVICE COMPRISING A CYLINDER HEAD PROVIDED WITH AN INTEGRATED EXHAUST COLLECTOR THERMALLY DECOUPLED
PCT/FR2007/051423 WO2007148000A1 (en) 2006-06-23 2007-06-12 Exhaust device comprising a cylinder head with a thermally decoupled integrated exhaust manifold

Publications (2)

Publication Number Publication Date
EP2032827A1 true EP2032827A1 (en) 2009-03-11
EP2032827B1 EP2032827B1 (en) 2009-12-30

Family

ID=37496874

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07788989A Active EP2032827B1 (en) 2006-06-23 2007-06-12 Exhaust device comprising a cylinder head with a thermally decoupled integrated exhaust manifold

Country Status (9)

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US (1) US20090229248A1 (en)
EP (1) EP2032827B1 (en)
JP (1) JP2009541656A (en)
AT (1) ATE453796T1 (en)
DE (1) DE602007004112D1 (en)
ES (1) ES2336629T3 (en)
FR (1) FR2902827B1 (en)
RU (1) RU2439356C2 (en)
WO (1) WO2007148000A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009001542A1 (en) 2009-03-13 2010-10-07 Ford Global Technologies, LLC, Dearborn Cylinder head for a naturally aspirated engine and use of such a cylinder head
FR3084109B1 (en) 2018-07-23 2022-08-19 Renault Sas THERMAL INSULATION DEVICE TO THE THERMAL ENGINE EXHAUST

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US3633368A (en) * 1970-08-12 1972-01-11 Du Pont Exhaust gas reactor
JPS5548746Y2 (en) * 1975-12-27 1980-11-14
GB1553584A (en) * 1976-04-08 1979-09-26 Perkins Engines Ltd Inlet and exhaust manifold assembly for an internal combustion engine
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JP2901097B2 (en) * 1991-02-13 1999-06-02 三信工業株式会社 Outboard exhaust purification system
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Also Published As

Publication number Publication date
ATE453796T1 (en) 2010-01-15
WO2007148000A1 (en) 2007-12-27
RU2009102073A (en) 2010-07-27
ES2336629T3 (en) 2010-04-14
US20090229248A1 (en) 2009-09-17
JP2009541656A (en) 2009-11-26
DE602007004112D1 (en) 2010-02-11
FR2902827A1 (en) 2007-12-28
FR2902827B1 (en) 2012-09-28
EP2032827B1 (en) 2009-12-30
RU2439356C2 (en) 2012-01-10

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