EP2118462B1 - Internal combustion engine comprising several combustion chambers - Google Patents

Internal combustion engine comprising several combustion chambers Download PDF

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Publication number
EP2118462B1
EP2118462B1 EP08707485A EP08707485A EP2118462B1 EP 2118462 B1 EP2118462 B1 EP 2118462B1 EP 08707485 A EP08707485 A EP 08707485A EP 08707485 A EP08707485 A EP 08707485A EP 2118462 B1 EP2118462 B1 EP 2118462B1
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EP
European Patent Office
Prior art keywords
cylinder head
shell element
exhaust
internal combustion
combustion engine
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EP08707485A
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German (de)
French (fr)
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EP2118462A1 (en
Inventor
Jochen HÄFNER
Dieter Nowak
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Mercedes Benz Group AG
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Daimler AG
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    • 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
    • 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
    • F01N13/1855—Mechanical joints the connection being realised by using bolts, screws, rivets or the like
    • 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
    • F02B77/13—Acoustic insulation
    • 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

Definitions

  • the invention relates to an internal combustion engine having a plurality of combustion chambers in the form of cylinders in which an air / fuel mixture can be reacted in a combustion reaction and which are bounded by a common cylinder head, wherein each combustion chamber is associated with an outlet channel formed in the cylinder head and a plurality of outlet channels in the area an exhaust manifold open into a common confluence area.
  • a cylinder head for a multi-cylinder internal combustion engine in which a plurality of exhaust passages extend from exhaust ports of the combustion chambers.
  • the exhaust ports merge in a confluence region that is substantially completely integrated into the cylinder head in such a way that it is integral with the cylinder head and is delimited by cooling water passages in the region of an upper side and in the region of an underside.
  • a mounting surface for a catalyst is provided, which is thus installed screwed directly to the cylinder head.
  • an internal combustion engine having a plurality of cylinders is known in which the exhaust ports of the individual cylinders are combined in an exhaust manifold and from this exhaust manifold leads a common line to an exhaust aftertreatment system.
  • the exhaust manifold is partially embedded in the cylinder head and covered by a shell, which is sealingly attached to a sealing flange on the cylinder head and having a connection piece for the common line.
  • JP 54 079317 A is also known an internal combustion engine having a plurality of cylinders, in which the exhaust ports of the individual cylinders unite in an exhaust manifold and leads from this exhaust manifold a common line to an exhaust aftertreatment system.
  • the exhaust manifold is partially embedded in the cylinder head and the cylinder housing and covered by a shell which is sealingly secured to a sealing flange on the cylinder head.
  • the object of the invention is in contrast to provide an exhaust manifold with particularly simple means whose heat transfer behavior is favorable.
  • the internal combustion engine has a plurality of combustion chambers in the form of cylinders in which an air / fuel mixture can be exothermically converted and which are delimited by a common cylinder head, wherein each combustion chamber is assigned an exhaust duct formed in the cylinder head and a plurality of exhaust ducts in the region of an exhaust manifold common confluence area.
  • the internal combustion engine according to the invention includes a common confluence region for exhaust gases, which is bounded on a first side by at least one wall of the cylinder head and on a second side by a separate, externally attached to the cylinder head shell element, the shell element for guiding the exhaust gas flow at least partially funnel-shaped and / or trough-shaped curved executed.
  • a plurality of outlet channels are preferably provided on the first side of the common confluence region, which are embodied in one piece as components of the cylinder head, in particular by casting methods, and open into the common confluence region.
  • a trough-shaped recess is provided on the cylinder head on the outside, which is preferably bounded or defined by a plurality of integrally cast walls of the cylinder head.
  • the trough-shaped depression is sealed off by means of the shell element to the outside, so that between the depression on the part of the cylinder head and the shell element results in a volume of space in which a plurality of exhaust gas streams can be combined and deflected. This volume of space is thus partly formed inside the cylinder head and partly outside the cylinder head, wherein the shell element is double-walled.
  • a mounting flange for the sealed fastening of the shell element on the cylinder head and an outlet opening with a pipe flange for mounting an exhaust pipe or an exhaust gas cleaning unit are provided on the shell element on the one hand, wherein mounting flange and pipe flange have different dimensions.
  • the substantially annular mounting flange defines a planar or curved separating plane between the cylinder head and the shell element, wherein the parting plane passes through the geometric area or the volume of space and subdivides it geometrically.
  • the pipe flange is designed to be smaller than the mounting flange, at least with regard to a geometric dimension, in particular with regard to a maximum transverse extent and / or its diameter and / or the flow-through cross section.
  • FIG. 1 shows a horizontal section through a cylinder head of an internal combustion engine according to the invention, which has six cylinders in two separate, V-shaped cylinder banks, in which an air / fuel mixture can be relegated under pressure and heat release.
  • the combustion can be carried out using the diesel process, the gasoline process or a similar combustion process.
  • Three cylinders in the present case have three combustion chambers which are delimited by a common cylinder head 1, which is preferably produced in one piece in a casting process.
  • Each combustion chamber is assigned two outlet channels 2 formed in the cylinder head 1, which can be closed in a manner known per se by way of exhaust valves (not shown).
  • the outlet channels 2 are preferably curved in the direction of the downstream exhaust pipe and positioned closely adjacent to a cylinder head fitting and / or closely adjacent to lubricating oil return bores.
  • the described plurality of six outlet channels 2 of a cylinder bank is assigned a common confluence region 3a in the region of an outlet manifold 3, in which the exhaust gas streams guided through the outlet channels 2 are combined.
  • the common confluence region 3 a is bounded on a first side A by a wall 1 a of the cylinder head 1.
  • the wall 1a of the cylinder head is essentially trough-shaped or pot-shaped and surrounded annularly by a mounting surface 1b.
  • Within the wall 1a passages to the outlet channels 2 are formed, which are arranged starting from a along the annular mounting surface 1b to be defined, non-annular separation surface T reset.
  • the confluence region 3a is provided by a separate, externally attached to the cylinder head
  • Shell member 4 is limited, which limits the confluence region 3 a as part of the exhaust manifold 3 to the outside.
  • the shell element 4 is preferably made of a temperature-resistant metal sheet, in particular made of a steel sheet, or as a metal casting and executed at least partially funnel-shaped and / or trough-shaped curved. Its simple shape allows a particularly simple and inexpensive production of the shell element.
  • the shell element has a circumferential annular groove, which engages in the region of the trough-shaped mounting surface in the cylinder head. According to the shell element is designed double-walled.
  • the shell element is made comparatively narrow, whereby the seal between the cylinder head and the shell element is improved.
  • the shell element 4 has a mounting flange 4 a for fastening, in particular releasable, by means of screws, which is designed to rest against the mounting surface 1 b. Between the mounting surface 1 b and the mounting flange 4 a, one or more preferably annular sealing elements can be used, which come to lie in the parting plane T.
  • a pipe flange 4b is provided on the shell element 4, the flow-through cross section of which differs from that of the mounting flange 4a with respect to essential geometric dimensions.
  • the pipe flange has a substantially circular passage cross-section, so that immediately adjacent a cylindrical pipe element can be mounted.
  • the tubular element may be part of an exhaust pipe and / or a Exhaust gas purification unit (catalyst, filter or the like).
  • the trough-shaped depression is sealingly closed towards the outside by means of the shell element 4, so that a volume of space results between the depression on the cylinder head 1 and the shell element 4 in which several exhaust gas streams can be combined, diverted and forwarded to a downstream exhaust gas system.
  • This volume of space is thus formed partly within the cylinder head (side A) and partly outside the cylinder head (side B), resulting in a particularly simple and cost-realizable construction of two approximately vertically divided halves.
  • constructive measures e.g. Dimensioning of the shape and depth of the shell member and the corresponding recess on the part of the cylinder head 1 set a desired heat transfer behavior.
  • a heat input into the cooling water compared to a fully integrated into the cylinder head design of the exhaust manifold reduced so that there is a faster heating downstream exhaust purification units.

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

Abstract

In an internal combustion engine having several combustion chambers formed in in-line cylinders wherein an air/fuel mixture can be combusted and which include a common cylinder head, with discharge passages formed within the cylinder head and extending to a common confluence zone in communication with a discharge manifold, the common confluence zone is delimited on a first side (A) by at least one cylinder head wall and a separate shell element on a second side mounted to the outside of the cylinder head, the shell element being curved funnel-like for conducting the exhaust gas away from the engine.

Description

Die Erfindung betrifft eine Brennkraftmaschine mit mehreren Brennräumen in Form von Zylindern, in denen ein Luft/Kraftstoff-Gemisch in einer Verbrennungsreaktion umsetzbar ist und die von einem gemeinsamen Zylinderkopf begrenzt sind, wobei jedem Brennraum ein im Zylinderkopf gebildeter Auslasskanal zugeordnet ist und mehrere Auslasskanäle im Bereich eines Auslasskrümmers in einen gemeinsamen Zusammenflussbereich münden.The invention relates to an internal combustion engine having a plurality of combustion chambers in the form of cylinders in which an air / fuel mixture can be reacted in a combustion reaction and which are bounded by a common cylinder head, wherein each combustion chamber is associated with an outlet channel formed in the cylinder head and a plurality of outlet channels in the area an exhaust manifold open into a common confluence area.

Aus der DE 101 41 534 A1 ist ein Zylinderkopf für eine mehrzylindrige Brennkraftmaschine bekannt, in dem sich mehrere Auslasskanäle von Auslassöffnungen der Brennräume erstrecken. Die Auslasskanäle vereinigen sich in einem Zusammenflussbereich, der im Wesentlichen vollständig derart in den Zylinderkopf integriert ist, dass er einstückig mit dem Zylinderkopf ausgeführt und im Bereich einer Oberseite und im Bereich einer Unterseite durch Kühlwasserkanäle begrenzt ist. An einem Flansch des Zylinderkopfes ist eine Montagefläche für einen Katalysator vorgesehen, der somit direkt an den Zylinderkopf angeschraubt verbaut ist. Eine solche Konfiguration erzielt einen besonders umfangreichen Wärmeaustausch zwischen dem Kühlwasser in den Kühlwasserkanälen und dem Abgas im Zusammenflussbereich, es ergibt sich aber eine aufwändige und komplizierte Zylinderkopfgestaltung, die zudem kostenintensiv realisierbar ist.From the DE 101 41 534 A1 For example, a cylinder head for a multi-cylinder internal combustion engine is known in which a plurality of exhaust passages extend from exhaust ports of the combustion chambers. The exhaust ports merge in a confluence region that is substantially completely integrated into the cylinder head in such a way that it is integral with the cylinder head and is delimited by cooling water passages in the region of an upper side and in the region of an underside. On a flange of the cylinder head, a mounting surface for a catalyst is provided, which is thus installed screwed directly to the cylinder head. Such a configuration achieves a particularly extensive heat exchange between the cooling water in the cooling water channels and the exhaust gas in the confluence area, but it results in a complex and complicated cylinder head design, which is also cost-intensive feasible.

Aus der WO 2004/090297 A2 ist eine Brennkraftmaschine mit mehreren Zylindern bekannt, bei der die Auslasskanäle der einzelnen Zylinder sich in einem Auspuffkrümmer vereinen und von diesem Auspuffkrümmer eine gemeinsame Leitung zu einer Abgasnachbehandlungsanlage führt. Der Auspuffkrümmer ist teilweise in den Zylinderkopf eingelassen und durch eine Schale abgedeckt, die an einem Dichtflansch am Zylinderkopf dichtend befestigt ist und ein Anschlussstück für die gemeinsame Leitung aufweist.From the WO 2004/090297 A2 For example, an internal combustion engine having a plurality of cylinders is known in which the exhaust ports of the individual cylinders are combined in an exhaust manifold and from this exhaust manifold leads a common line to an exhaust aftertreatment system. The exhaust manifold is partially embedded in the cylinder head and covered by a shell, which is sealingly attached to a sealing flange on the cylinder head and having a connection piece for the common line.

Aus der JP 54 079317 A ist ebenfalls eine Brennkraftmaschine mit mehreren Zylindern bekannt, bei der die Auslasskanäle der einzelnen Zylinder sich in einem Auspuffkrümmer vereinen und von diesem Auspuffkrümmer eine gemeinsame Leitung zu einer Abgasnachbehandlungsanlage führt. Der Auspuffkrümmer ist teilweise in den Zylinderkopf und das Zylindergehäuse eingelassen und durch eine Schale abgedeckt, die an einem Dichtflansch am Zylinderkopf dichtend befestigt ist.From the JP 54 079317 A is also known an internal combustion engine having a plurality of cylinders, in which the exhaust ports of the individual cylinders unite in an exhaust manifold and leads from this exhaust manifold a common line to an exhaust aftertreatment system. The exhaust manifold is partially embedded in the cylinder head and the cylinder housing and covered by a shell which is sealingly secured to a sealing flange on the cylinder head.

Aufgabe der Erfindung ist es demgegenüber, mit besonders einfachen Mitteln einen Abgaskrümmer zu schaffen, dessen Wärmeübertragungsverhalten günstig ist.The object of the invention is in contrast to provide an exhaust manifold with particularly simple means whose heat transfer behavior is favorable.

Diese Aufgabe wird durch eine Brennkraftmaschine mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen und Ausgestaltungen der Erfindung sind auch Gegenstand der nachfolgenden Beschreibung.This object is achieved by an internal combustion engine with the features of claim 1. Advantageous developments and refinements of the invention are also the subject of the following description.

Die Brennkraftmaschine weist mehrere Brennräumen in Form von Zylindern auf, in denen ein Luft/Kraftstoff-Gemisch exotherm umsetzbar ist und die von einem gemeinsamen Zylinderkopf begrenzt sind, wobei jedem Brennraum ein im Zylinderkopf ausgebildeter Auslasskanal zugeordnet ist und mehrere Auslasskanäle im Bereich eines Auslasskrümmers in einen gemeinsamen Zusammenflussbereich münden. Die erfindungsgemäße Brennkraftmaschine beinhaltet einen gemeinsamen Zusammenflussbereich für Abgase, der auf einer ersten Seite durch wenigstens eine Wandung des Zylinderkopfes und auf einer zweiten Seite durch ein separates, an den Zylinderkopf außenseitig angebrachtes Schalenelement begrenzt ist, wobei das Schalenelement zur Führung der Abgasströmung wenigstens abschnittweise trichterförmig und/oder wannenförmig gewölbt ausgeführt ist. Dabei sind auf der ersten Seite des gemeinsamen Zusammenflussbereichs bevorzugt mehrere Auslasskanäle vorgesehen, die als Bestandteile des Zylinderkopfes insbesondere durch Gussverfahren einstückig ausgeführt sind und in den gemeinsamen Zusammenflussbereich münden. Zur Bildung des gemeinsamen Zusammenflussbereichs ist an dem Zylinderkopf außenseitig eine wannenförmige Vertiefung vorgesehen, die bevorzugt durch mehrere einstückig vergossene Wandungen des Zylinderkopfes begrenzt bzw. definiert ist. Die wannenförmige Vertiefung ist mittels des Schalenelements nach außen hin dichtend abgeschlossen, sodass sich zwischen der Vertiefung seitens des Zylinderkopfes und dem Schalenelement ein Raumvolumen ergibt, in dem mehrere Abgasströme vereinigt und umgelenkt werden können. Dieses Raumvolumen ist somit teils innerhalb des Zylinderkopfes und teils außerhalb des Zylinderkopfes gebildet wobei das Schalenelement doppelwandig ausgeführt ist.The internal combustion engine has a plurality of combustion chambers in the form of cylinders in which an air / fuel mixture can be exothermically converted and which are delimited by a common cylinder head, wherein each combustion chamber is assigned an exhaust duct formed in the cylinder head and a plurality of exhaust ducts in the region of an exhaust manifold common confluence area. The internal combustion engine according to the invention includes a common confluence region for exhaust gases, which is bounded on a first side by at least one wall of the cylinder head and on a second side by a separate, externally attached to the cylinder head shell element, the shell element for guiding the exhaust gas flow at least partially funnel-shaped and / or trough-shaped curved executed. In this case, a plurality of outlet channels are preferably provided on the first side of the common confluence region, which are embodied in one piece as components of the cylinder head, in particular by casting methods, and open into the common confluence region. To form the common confluence region, a trough-shaped recess is provided on the cylinder head on the outside, which is preferably bounded or defined by a plurality of integrally cast walls of the cylinder head. The trough-shaped depression is sealed off by means of the shell element to the outside, so that between the depression on the part of the cylinder head and the shell element results in a volume of space in which a plurality of exhaust gas streams can be combined and deflected. This volume of space is thus partly formed inside the cylinder head and partly outside the cylinder head, wherein the shell element is double-walled.

In einer Ausgestaltung der Erfindung sind an dem Schalenelement einerseits ein Montageflansch zur abgedichteten Befestigung des Schalenelements am Zylinderkopf sowie eine Auslassöffnung mit einem Rohrflansch zur Montage eines Abgasrohrs oder einer Abgasreinigungseinheit vorgesehen, wobei Montageflansch und Rohrflansch unterschiedliche Abmessungen aufweisen. Der im Wesentlichen ringförmige Montageflansch definiert eine ebene oder gewölbte Trennebene zwischen Zylinderkopf und Schalenelement, wobei die Trennebene den Zusammenflussbereich bzw. das Raumvolumen durchgreift und geometrisch unterteilt. Der Rohrflansch ist zumindest hinsichtlich einer geometrischen Abmessung, insbesondere hinsichtlich einer maximalen Quererstreckung und/oder seines Durchmessers und/oder des durchströmbaren Querschnitts kleiner gestaltet als der Montageflansch.In one embodiment of the invention, a mounting flange for the sealed fastening of the shell element on the cylinder head and an outlet opening with a pipe flange for mounting an exhaust pipe or an exhaust gas cleaning unit are provided on the shell element on the one hand, wherein mounting flange and pipe flange have different dimensions. The substantially annular mounting flange defines a planar or curved separating plane between the cylinder head and the shell element, wherein the parting plane passes through the geometric area or the volume of space and subdivides it geometrically. The pipe flange is designed to be smaller than the mounting flange, at least with regard to a geometric dimension, in particular with regard to a maximum transverse extent and / or its diameter and / or the flow-through cross section.

Obige sowie weitere Merkmale und Vorteile der Erfindung werden aus der nachfolgenden Beschreibung eines bevorzugten, nicht-einschränkenden Ausführungsbeispiels der Erfindung unter Bezugnahme auf die beiliegenden Zeichnungen besser verständlich.The above and other features and advantages of the invention will become more apparent from the following description of a preferred, non-limiting embodiment of the invention with reference to the accompanying drawings.

Darin zeigen

Figur 1:
einen schematisch dargestellten Schnitt durch einen Zylinderkopf einer erfindungsgemäßen Brennkraftmaschine mit einem Abgaskrümmer und
Figur 2:
eine perspektivische Ansicht des Zylinderkopfs.
Show in it
FIG. 1:
a schematically illustrated section through a cylinder head of an internal combustion engine according to the invention with an exhaust manifold and
FIG. 2:
a perspective view of the cylinder head.

Figur 1 zeigt einen Horizontalschnitt durch einen Zylinderkopf einer erfindungsgemäßen Brennkraftmaschine, die in zwei separaten, V-förmig angeordneten Zylinderbänken sechs Zylinder aufweist, in denen ein Luft/Kraftstoff-Gemisch unter Druck- und Wärmefreisetzung verbannt werden kann. Die Verbrennung kann dabei nach dem Dieselverfahren, nach dem Ottoverfahren oder nach einem ähnlichen Brennverfahren durchgeführt werden. Drei Zylinder weisen vorliegend drei Brennräume auf, die von einem gemeinsamen, bevorzugt einstückig in einem Gussverfahren hergestellten Zylinderkopf 1 begrenzt sind. Jedem Brennraum sind zwei im Zylinderkopf 1 gebildete Auslasskanäle 2 zugeordnet, die über nicht dargestellte Auslassventile in an sich bekannter Weise verschließbar sind. Die Auslasskanäle 2 sind in bevorzugter Weise in Richtung nachgeschalteter Abgasleitung gekrümmt ausgeführt und eng an eine Zylinderkopfverschraubung und/oder eng an Schmieröl-Rücklaufbohrungen angrenzend positioniert. FIG. 1 shows a horizontal section through a cylinder head of an internal combustion engine according to the invention, which has six cylinders in two separate, V-shaped cylinder banks, in which an air / fuel mixture can be relegated under pressure and heat release. The combustion can be carried out using the diesel process, the gasoline process or a similar combustion process. Three cylinders in the present case have three combustion chambers which are delimited by a common cylinder head 1, which is preferably produced in one piece in a casting process. Each combustion chamber is assigned two outlet channels 2 formed in the cylinder head 1, which can be closed in a manner known per se by way of exhaust valves (not shown). The outlet channels 2 are preferably curved in the direction of the downstream exhaust pipe and positioned closely adjacent to a cylinder head fitting and / or closely adjacent to lubricating oil return bores.

Der beschriebenen Mehrzahl von sechs Auslasskanälen 2 einer Zylinderbank ist im Bereich eines Auslasskrümmers 3 ein gemeinsamer Zusammenflussbereich 3a zugeordnet, in dem die durch die Auslasskanäle 2 geführten Abgasströme vereinigt werden. Der gemeinsame Zusammenflussbereich 3a ist auf einer ersten Seite A durch eine Wandung 1a des Zylinderkopfes 1 begrenzt. Die Wandung 1a des Zylinderkopfs ist im Wesentlichen wannen- oder topfförmig ausgeführt und von einer Montagefläche 1b ringförmig umgeben. Innerhalb der Wandung 1a sind Durchlässe zu den Auslasskanälen 2 gebildet, die ausgehend von einer entlang der ringförmigen Montagefläche 1b zu definierenden, nicht ringförmigen Trennfläche T zurückgesetzt angeordnet sind.The described plurality of six outlet channels 2 of a cylinder bank is assigned a common confluence region 3a in the region of an outlet manifold 3, in which the exhaust gas streams guided through the outlet channels 2 are combined. The common confluence region 3 a is bounded on a first side A by a wall 1 a of the cylinder head 1. The wall 1a of the cylinder head is essentially trough-shaped or pot-shaped and surrounded annularly by a mounting surface 1b. Within the wall 1a passages to the outlet channels 2 are formed, which are arranged starting from a along the annular mounting surface 1b to be defined, non-annular separation surface T reset.

Auf einer zweiten Seite B ist der Zusammenflussbereich 3a durch ein separates, an den Zylinderkopf außenseitig angebrachtes Schalenelement 4 begrenzt ist, das als Bestandteil des Auslasskrümmers 3 den Zusammenflussbereich 3a nach außen hin begrenzt. Das Schalenelement 4 ist bevorzugt aus einem temperaturbeständigen Metallblech, insbesondere aus einem Stahlblech, oder als Metallgussteil hergestellt und wenigstens abschnittsweise trichterförmig und/oder wannenförmig gewölbt ausgeführt. Seine einfache Form ermöglicht eine besonders einfache und kostengünstige Herstellung des Schalenelements. In einem modifizierten Ausführungsbeispiel weist das Schalenelement eine umlaufende ringförmige Nut auf, die im Bereich der wannenförmigen Montagefläche in den Zylinderkopf eingreift. Erfindungsgemäß ist das Schalenelement doppelwandig ausgeführt. In wiederum einem weiteren, modifizierten Ausführungsbeispiel ist das Schalenelement vergleichsweise schmal ausgeführt, wodurch die Abdichtung zwischen dem Zylinderkopf und dem Schalenelement verbessert ist.On a second side B, the confluence region 3a is provided by a separate, externally attached to the cylinder head Shell member 4 is limited, which limits the confluence region 3 a as part of the exhaust manifold 3 to the outside. The shell element 4 is preferably made of a temperature-resistant metal sheet, in particular made of a steel sheet, or as a metal casting and executed at least partially funnel-shaped and / or trough-shaped curved. Its simple shape allows a particularly simple and inexpensive production of the shell element. In a modified embodiment, the shell element has a circumferential annular groove, which engages in the region of the trough-shaped mounting surface in the cylinder head. According to the shell element is designed double-walled. In yet another modified embodiment, the shell element is made comparatively narrow, whereby the seal between the cylinder head and the shell element is improved.

Das Schalenelement 4 weist zur insbesondere lösbaren Befestigung mittels Schrauben einen Montageflansch 4a auf, der anliegend an die Montagefläche 1b gestaltet ist. Zwischen Montagefläche 1b und Montageflansch 4a sind somit eines oder mehrere bevorzugt ringförmige Dichtelemente einsetzbar, die in der Trennebene T zu liegen kommen.The shell element 4 has a mounting flange 4 a for fastening, in particular releasable, by means of screws, which is designed to rest against the mounting surface 1 b. Between the mounting surface 1 b and the mounting flange 4 a, one or more preferably annular sealing elements can be used, which come to lie in the parting plane T.

Beabstandet von der Trennebene T und beabstandet vom Zylinderkopf 1 ist an dem Schalenelement 4 ein Rohrflansch 4b vorgesehen, dessen durchströmbarer Querschnitt sich hinsichtlich wesentlicher geometrischer Abmessungen von demjenigen des Montageflansches 4a unterscheidet. In bevorzugter Weise weist der Rohrflansch einen im Wesentlichen kreisförmigen Durchlassquerschnitt auf, sodass unmittelbar angrenzend ein zylindrisches Rohrelement montierbar ist. Das Rohrelement kann dabei Bestandteil einer Abgasrohrleitung und/oder einer Abgasreinigungseinheit (Katalysator, Filter oder dergleichen) sein.Spaced apart from the parting plane T and spaced from the cylinder head 1, a pipe flange 4b is provided on the shell element 4, the flow-through cross section of which differs from that of the mounting flange 4a with respect to essential geometric dimensions. Preferably, the pipe flange has a substantially circular passage cross-section, so that immediately adjacent a cylindrical pipe element can be mounted. The tubular element may be part of an exhaust pipe and / or a Exhaust gas purification unit (catalyst, filter or the like).

Die wannenförmige Vertiefung ist mittels des Schalenelements 4 nach außen hin dichtend abgeschlossen, sodass sich zwischen der Vertiefung seitens des Zylinderkopfes 1 und dem Schalenelement 4 ein Raumvolumen ergibt, in dem mehrere Abgasströme vereinigt, umgelenkt und an ein nachgeschaltetes Abgassystem weitergeleitet werden können. Dieses Raumvolumen ist somit teils innerhalb des Zylinderkopfes (Seite A) und teils außerhalb des Zylinderkopfes (Seite B) gebildet, wodurch sich zum einen ein besonders einfacher und kostengünstig realisierbarer Aufbau aus zwei näherungsweise vertikal unterteilten Hälften ergibt. Zum anderen lässt sich durch konstruktive Maßnahmen, z.B. Dimensionierung von Form und Tiefe des Schalenelements sowie der korrespondierenden Vertiefung seitens des Zylinderkopfes 1 ein gewünschtes Wärmeübertragungsverhalten einstellen. Vor allem beim Kaltstart der Brennkraftmaschine ist erfindungsgemäß ein Wärmeeintrag ins Kühlwasser gegenüber einer voll in den Zylinderkopf integrierten Ausführung des Abgaskrümmers reduziert, sodass sich eine schnellere Erwärmung nachgeschalteter Abgasreinigungseinheiten ergibt.The trough-shaped depression is sealingly closed towards the outside by means of the shell element 4, so that a volume of space results between the depression on the cylinder head 1 and the shell element 4 in which several exhaust gas streams can be combined, diverted and forwarded to a downstream exhaust gas system. This volume of space is thus formed partly within the cylinder head (side A) and partly outside the cylinder head (side B), resulting in a particularly simple and cost-realizable construction of two approximately vertically divided halves. On the other hand, constructive measures, e.g. Dimensioning of the shape and depth of the shell member and the corresponding recess on the part of the cylinder head 1 set a desired heat transfer behavior. Especially when cold starting the internal combustion engine according to the invention, a heat input into the cooling water compared to a fully integrated into the cylinder head design of the exhaust manifold reduced so that there is a faster heating downstream exhaust purification units.

Claims (3)

  1. Internal combustion engine comprising several combustion chambers in the form of cylinders in which an air/fuel mixture can be converted exothermally and which are bounded by a common cylinder head (1), wherein an exhaust port (2) is assigned to each combustion chamber and several exhaust ports (2) terminate in the region of an exhaust manifold (3) into a common confluence region (3a), which is bounded on a first side (A) by at least one wall (1 a) of the cylinder head and on a second side (B) by a separate shell element (4) mounted on the outside of the cylinder head, the shell element being designed to have a funnel- and/or trough-shaped curvature at least in sections in order to guide the exhaust gas flow,
    characterised in that
    the exhaust ports (2) are formed in the cylinder head (1), in that openings leading to the exhaust ports (2) are formed within the wall (1 a) of the cylinder head which bounds the common confluence region (3a), in that the shell element is double-walled, and in that a trough-shaped recess is provided on the outside of the cylinder head in order to form the common confluence region.
  2. Internal combustion engine according to claim 1,
    characterised in that
    the shell element (4) is provided on one side with a mounting flange (4a) for the sealed mounting of the shell element on the cylinder head (1) and on the other side with an outlet port with a pipe flange (4b) for mounting an exhaust pipe or an exhaust gas purification unit, the mounting flange (4a) and the pipe flange (4b) having different dimensions.
  3. Internal combustion engine according to claim 1 or 2,
    characterised in that
    the shell element (4) is produced from heat-resistant sheet metal or as a metal casting.
EP08707485A 2007-02-16 2008-02-01 Internal combustion engine comprising several combustion chambers Active EP2118462B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007007638A DE102007007638A1 (en) 2007-02-16 2007-02-16 Internal combustion engine with several combustion chambers
PCT/EP2008/000799 WO2008098685A1 (en) 2007-02-16 2008-02-01 Internal combustion engine comprising several combustion chambers

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EP2118462A1 EP2118462A1 (en) 2009-11-18
EP2118462B1 true EP2118462B1 (en) 2012-04-11

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US (1) US8291880B2 (en)
EP (1) EP2118462B1 (en)
JP (2) JP2010518317A (en)
CN (1) CN101617108B (en)
AT (1) ATE553290T1 (en)
DE (1) DE102007007638A1 (en)
WO (1) WO2008098685A1 (en)

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DE102007007638A1 (en) 2008-08-21
JP2012207670A (en) 2012-10-25
US20100037847A1 (en) 2010-02-18
EP2118462A1 (en) 2009-11-18
US8291880B2 (en) 2012-10-23
JP2010518317A (en) 2010-05-27
ATE553290T1 (en) 2012-04-15
WO2008098685A1 (en) 2008-08-21
CN101617108A (en) 2009-12-30
CN101617108B (en) 2011-07-27

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