EP4103826A1 - Spark-ignited reciprocating piston internal combustion engine with a pre-chamber ignition system - Google Patents

Spark-ignited reciprocating piston internal combustion engine with a pre-chamber ignition system

Info

Publication number
EP4103826A1
EP4103826A1 EP21701428.1A EP21701428A EP4103826A1 EP 4103826 A1 EP4103826 A1 EP 4103826A1 EP 21701428 A EP21701428 A EP 21701428A EP 4103826 A1 EP4103826 A1 EP 4103826A1
Authority
EP
European Patent Office
Prior art keywords
internal combustion
combustion engine
ignition system
housing
cover
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.)
Withdrawn
Application number
EP21701428.1A
Other languages
German (de)
French (fr)
Inventor
Daniel Taterra
Erik Schaefer
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP4103826A1 publication Critical patent/EP4103826A1/en
Withdrawn legal-status Critical Current

Links

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
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/12—Engines characterised by precombustion chambers with positive ignition
    • 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
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/16—Chamber shapes or constructions not specific to sub-groups F02B19/02 - F02B19/10
    • F02B19/18—Transfer passages between chamber and cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P13/00—Sparking plugs structurally combined with other parts of internal-combustion engines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • H01T13/39—Selection of materials for electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/54—Sparking plugs having electrodes arranged in a partly-enclosed ignition chamber
    • 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

Definitions

  • the invention relates to an externally ignited reciprocating internal combustion engine with a prechamber ignition system with the features from the preamble of claim 1.
  • an ignition device for igniting fuel-air mixtures in a combustion chamber of an internal combustion engine by means of a corona discharge is known, with an ignition electrode, an outer conductor surrounding the ignition electrode, which has a front and a rear end and with one between the ignition electrode and the outer conductor arranged electrical insulator, from which at least one tip of the ignition electrode protrudes.
  • the at least one tip of the ignition electrode lies in a space which is shielded by a cap assigned to the insulator, which has an inside facing the insulator and an outside facing away from the insulator, as well as one or more holes through which the shielded space and one on the outside The space lying on the cap, the combustion chamber, is in communication.
  • a spark plug for igniting a combustible gas mixture in an internal combustion engine comprising: an ignition electrode, an electrical supply line to which the ignition electrode is connected, an insulator body through which the supply line is passed, a housing head which sits sealingly on the insulator body and an external thread for screwing into an internal combustion engine, a tubular housing which is fastened to the housing head, surrounds the insulator body and carries a hexagon, the tubular housing having a Surrounds the insulator body holder, which is welded to the housing head via a weld seam and presses the insulator body against the housing head with a pretension.
  • German laid-open specification DE 102016 120984 A1 A prechamber spark plug for a gas-operated internal combustion engine and a method for its production are known from this laid-open specification.
  • a spark plug is also known from German patent application DE 102016206992 A1, from which the present invention is based.
  • the spark plug is, in particular, a prechamber spark plug with a housing, an ignition electrode and a ground electrode, the ignition electrode being able to have an electrical voltage applied to it via a supply line and the supply line running at least partially within an insulator, with at least one discharge area of the housing is made of a material with a thermal conductivity of over 170 W / (m * K).
  • a prechamber ignition system made of a material with a thermal conductivity of> 250 W / (m * K) is necessary ) to use.
  • this material has the disadvantage in the lower left map (low speed, low load) that too much heat (energy) is lost.
  • the object of the present invention is to show a measure with which the ignitability of a prechamber ignition system in a high load and / or Speed range or in the event of a late ignition of an internal combustion engine can be ensured.
  • the upper part of the prechamber ignition system remains with a very strongly thermally conductive material with a thermal conductivity preferably greater than 170 W / (m * K) in order to be able to give off the excess heat to the cylinder head.
  • the cap material of the cover of the prechamber ignition system is designed according to the invention in such a way that in the nominal power point (area of the highest power output of the internal combustion engine) no pre-ignition occurs but is as hot as possible.
  • materials with a thermal conductivity of less than 170 W / (m * K) such as. B. the following alloys:
  • the ignition device heats up, e.g. Legs Spark plug in the prechamber ignition system, because the heat remains in the lower part (cover area) of the prechamber ignition system.
  • the cover of the prechamber ignition system (cover is the part that largely protrudes from the prechamber ignition system into the combustion chamber) is made from one of the above-mentioned materials.
  • This other cover material is welded to the housing according to claim 2, for example by friction welding or fused to one another in a 3D printing process.
  • Fig. 1 shows a section through an antechamber ignition system.
  • Figure 1 shows a section through a prechamber ignition system 1 for an externally ignited floating piston internal combustion engine, in particular a floating piston internal combustion engine, with a housing 2, which in this embodiment is formed radially on the outside by a cylinder head material of a cylinder head 3 of the floating piston internal combustion engine.
  • An ignition device 4 is arranged in the prechamber ignition system 1 and projects into a flea space 5 in the housing 2.
  • a spark plug, a corona ignition system or some other ignition device for externally ignited internal combustion engines can be provided as the ignition device.
  • the flea chamber 5 is covered by a cover 7 on the side facing away from the ignition device 4, opposite a combustion chamber 6 of the floating piston internal combustion engine.
  • the cover 7 has at least one first opening 8 which connects the flea chamber 5 and the combustion chamber 6 to one another in a gas-carrying manner.
  • two openings 8 can be seen. These openings 8 can be bores in the cover 7, for example.
  • the cover 7 itself can be connected to the cylinder head 3 in a material and / or form-fitting manner or in a 3D printing process.
  • a fuel injector 9 can also be seen in FIG. 1, with which fuel can be introduced into the combustion chamber 6 of the reciprocating piston internal combustion engine in order to produce a combustible fuel / air mixture in the combustion chamber 6.
  • the technical problem is solved by using a combination material for the prechamber ignition system 1.
  • the upper part of the prechamber ignition system 1 (in the area of the ignition device 4) remains a very highly thermally conductive material with a thermal conductivity preferably> 170 W / (m * K) in order to be able to give off the excess heat to the cylinder head 3.
  • the material of the cover 7 of the prechamber ignition system 1 is designed according to the invention in such a way that in the nominal power point (area of the highest power output of the internal combustion engine) no pre-ignition occurs but is as hot as possible.
  • Materials with a thermal conductivity ⁇ 170 W / (m * K), such as the following alloys, are suitable for this purpose:
  • the low load for the externally ignited internal combustion engine and retarded ignition times can be achieved, since only little energy is lost from the combustion in the prechamber ignition system 1 on the way into the combustion chamber 6.
  • the cover of the prechamber ignition system 1 is made from one of the above-mentioned materials and not from the standard material of the housing 2.
  • the inventive design of the prechamber ignition system 1 can be used both for passive prechamber ignition systems, as shown here, and for active prechamber ignition systems , with its own introduction of fuel into the cavity 5, can be used.
  • the housing 2 can also be formed as a separate housing 2, which is introduced into the cylinder head 3, instead of the cylinder head material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

The invention relates to a spark-ignited reciprocating piston internal combustion engine with a pre-chamber ignition system with a housing, which can be built into a cylinder head of the reciprocating piston internal combustion engine and in which an ignition device is arranged, which projects into a hollow space in the housing, wherein the hollow space is covered by a cover relative to a combustion chamber of the reciprocating piston internal combustion engine, wherein the cover has at least one first opening, which connects the hollow space and the combustion chamber in a gas-guiding manner, wherein the housing consists of a material with a heat conductivity of greater than 170 W/(m*K) and the cover consists of a material with a heat conductivity of less than 170 W/(m*K). Due to the embodiment of the pre-chamber ignition system according to the invention, the ignition of a fuel/air mixture in the pre-chamber ignition system is significantly improved with a high load and/or rotational speed of the internal combustion engine.

Description

Fremd gezündete Hubkolben-Brennkraftmaschine mit einem Vorkammerzündsystem Externally ignited reciprocating internal combustion engine with a prechamber ignition system
Die Erfindung betrifft eine fremd gezündete Hubkolben-Brennkraftmaschine mit einem Vorkammerzündsystem mit den Merkmalen aus dem Oberbegriff des Patentanspruchs 1. The invention relates to an externally ignited reciprocating internal combustion engine with a prechamber ignition system with the features from the preamble of claim 1.
Zum technischen Umfeld wird beispielsweise auf die deutsche Offenlegungsschrift DE 102014 111 897 A1 hingewiesen. Aus dieser ist eine Zündeinrichtung zum Zünden von Brennstoff-Luft-Gemischen in einer Brennkammer eines Verbrennungsmotors mittels einer Corona-Entladung bekannt, mit einer Zündelektrode, einen die Zündelektrode umgebenden Außenleiter, welcher ein vorderes und ein hinteres Ende hat und mit einem zwischen der Zündelektrode und dem Außenleiter angeordneten elektrischen Isolator, aus welchem wenigstens eine Spitze der Zündelektrode herausragt. Die wenigstens eine Spitze der Zündelektrode liegt in einem Raum, der durch eine dem Isolator zugeordnete Kappe abgeschirmt ist, die eine dem Isolator zugewandte Innenseite und eine dem Isolator abgewandte Außenseite sowie eines oder mehrere Löcher hat, durch welche der abgeschirmte Raum mit einem auf der Außenseite der Kappe liegenden Raum, der Brennkammer, in Verbindung steht. Regarding the technical environment, reference is made, for example, to the German laid-open specification DE 102014 111 897 A1. From this, an ignition device for igniting fuel-air mixtures in a combustion chamber of an internal combustion engine by means of a corona discharge is known, with an ignition electrode, an outer conductor surrounding the ignition electrode, which has a front and a rear end and with one between the ignition electrode and the outer conductor arranged electrical insulator, from which at least one tip of the ignition electrode protrudes. The at least one tip of the ignition electrode lies in a space which is shielded by a cap assigned to the insulator, which has an inside facing the insulator and an outside facing away from the insulator, as well as one or more holes through which the shielded space and one on the outside The space lying on the cap, the combustion chamber, is in communication.
Weiter ist aus der internationalen Patentanmeldung mit der internationalen Veröffentlichungsnummer WO 1708/031482 A2 eine Zündkerze zum Zünden eines brennbaren Gasgemisches beim Verbrennungsmotor bekannt, umfassend: eine Zündelektrode, eine elektrische Versorgungsleitung, an welche die Zündelektrode angeschlossen ist, einen Isolatorkörper, durch den die Versorgungsleitung hindurchgeführt ist, ein Gehäusekopf, der dichtend auf dem Isolatorkörper sitzt und ein Außengewinde zum Einschrauben in einen Verbrennungsmotor, ein Rohrgehäuse, das an dem Gehäusekopf befestigt ist, den Isolatorkörper umgibt und einen Sechskant trägt, wobei das Rohrgehäuse eine Isolatorkörper-Halterung umgibt, die über eine Schweißnaht mit dem Gehäusekopf verschweißt ist und den Isolatorkörper mit einer Vorspannung gegen den Gehäusekopf presst. Furthermore, from the international patent application with the international publication number WO 1708/031482 A2, a spark plug for igniting a combustible gas mixture in an internal combustion engine is known, comprising: an ignition electrode, an electrical supply line to which the ignition electrode is connected, an insulator body through which the supply line is passed, a housing head which sits sealingly on the insulator body and an external thread for screwing into an internal combustion engine, a tubular housing which is fastened to the housing head, surrounds the insulator body and carries a hexagon, the tubular housing having a Surrounds the insulator body holder, which is welded to the housing head via a weld seam and presses the insulator body against the housing head with a pretension.
Zum weiteren technischen Umfeld wird ferner auf die deutsche Offenlegungsschrift DE 102016 120984 A1 hingewiesen. Aus dieser Offenlegungsschrift ist eine Vorkammerzündkerze für eine mit Gas betriebene Brennkraftmaschine und ein Verfahren zu deren Herstellung bekannt. For further technical information, reference is also made to German laid-open specification DE 102016 120984 A1. A prechamber spark plug for a gas-operated internal combustion engine and a method for its production are known from this laid-open specification.
Weiter ist aus der deutschen Offenlegungsschrift DE 102016206992 A1 , von der die vorliegende Erfindung ausgeht, eine Zündkerze bekannt. Bei der Zündkerze handelt es sich insbesondere um eine Vorkammerzündkerze, mit einem Gehäuse, einer Zündelektrode und einer Masseelektrode, wobei die Zündelektrode über eine Versorgungsleitung mit einer elektrischen Spannung beaufschlagbar ist und wobei die Versorgungsleitung zumindest teilweise innerhalb eines Isolators verläuft, wobei zumindest ein Ableitungsbereich des Gehäuses aus einem Material mit einer Wärmeleitfähigkeit von über 170 W/(m*K) hergestellt ist. A spark plug is also known from German patent application DE 102016206992 A1, from which the present invention is based. The spark plug is, in particular, a prechamber spark plug with a housing, an ignition electrode and a ground electrode, the ignition electrode being able to have an electrical voltage applied to it via a supply line and the supply line running at least partially within an insulator, with at least one discharge area of the housing is made of a material with a thermal conductivity of over 170 W / (m * K).
Um im oberen rechten Kennfeld (hohe Drehzahl, hohe Last) einer Brennkraftmaschine, insbesondere einer Hochleistungs-Brennkraftmaschine, einen stabilen Betrieb (Vorentflammungsfrei) zu gewährleisten, ist es notwendig ein Vorkammerzündsystem aus einem Material mit einer Wärmeleitfähigkeit von > 250 W/(m*K) zu verwenden. Dieses Material hat aber den Nachteil im unteren linken Kennfeld (niedrige Drehzahl, niedrige Last) dass zu viel Wärme (Energie) verloren geht. In order to ensure stable operation (pre-ignition-free) in the upper right-hand map (high speed, high load) of an internal combustion engine, in particular a high-performance internal combustion engine, a prechamber ignition system made of a material with a thermal conductivity of> 250 W / (m * K) is necessary ) to use. However, this material has the disadvantage in the lower left map (low speed, low load) that too much heat (energy) is lost.
Aufgabe der vorliegenden Erfindung ist es, eine Maßnahme aufzuzeigen, mit der die Zündfähigkeit eines Vorkammerzündsystems in einem hohen Last- und/oder Drehzahlbereich oder bei einer späten Zündung einer Brennkraftmaschine sichergestellt werden kann. The object of the present invention is to show a measure with which the ignitability of a prechamber ignition system in a high load and / or Speed range or in the event of a late ignition of an internal combustion engine can be ensured.
Diese Aufgabe wird durch das Merkmal im kennzeichnenden Teil des Patentanspruchs 1 gelöst. This object is achieved by the feature in the characterizing part of claim 1.
Eine vorteilhafte Weiterbildung der Erfindung ist in dem Unteranspruch beschrieben. An advantageous development of the invention is described in the dependent claim.
Dieses o. g. technische Problem wird gelöst, indem ein Kombinationswerkstoff für das Vorkammerzündsystem eingesetzt wird. Der obere Teil des Vorkammerzündsystems bleibt mit einem sehr stark Wärme leitenden Material mit einer Wärmeleitfähigkeit vorzugweise größer 170 W/(m*K) um die überschüssige Wärme an den Zylinderkopf abgeben zu können. This above technical problem is solved by using a combination material for the prechamber ignition system. The upper part of the prechamber ignition system remains with a very strongly thermally conductive material with a thermal conductivity preferably greater than 170 W / (m * K) in order to be able to give off the excess heat to the cylinder head.
Das Kappenmaterial des Deckels des Vorkammerzündsystems wird erfindungsgemäß so ausgelegt dass im Nennleistungspunkt (Bereich höchster Leistungsabgabe der Brennkraftmaschine) keine Vorentflammung entsteht aber so heiß wie möglich ist. Dazu eignen sich beispielsweise Materialen mit einer Wärmeleitfähigkeit kleiner 170 W/(m*K), wie z. B. folgende Legierungen: The cap material of the cover of the prechamber ignition system is designed according to the invention in such a way that in the nominal power point (area of the highest power output of the internal combustion engine) no pre-ignition occurs but is as hot as possible. For example, materials with a thermal conductivity of less than 170 W / (m * K), such as. B. the following alloys:
• TZM, eine Molybdänlegierung, • TZM, a molybdenum alloy,
• Wolfram/CuCrIZr 50/50, • Tungsten / CuCrIZr 50/50,
• Nickel 2.4066, • nickel 2.4066,
• Inconel, eine hoch korrosions- und temperaturbeständige Nickellegierung oder• Inconel, a highly corrosion and temperature resistant nickel alloy or
• Stahl 1.4859 (20% Cr). • Steel 1.4859 (20% Cr).
Durch das Integrieren von zwei verschiedenen Materialien für das Vorkammerzündsystem (Wärmeleitfähigkeit > 170 W/(m*K) für das Gehäuse und einer Wärmeleitfähigkeit kleiner 170 W/(m*K) für den Deckel, jeweils im lösungsgeglühten Zustand (CuCrIZr) bei 20°C) können die Niedriglast für die fremd gezündete Brennkraftmaschine und späte Zündzeitpunkte (beispielsweise für das Heizen einer Abgasnachbehandlungseinheit) realisiert werden, da nur wenig Energie von der Verbrennung in dem Vorkammerzündsystem auf dem Weg in den Hauptbrennraum verloren geht. Zudem heizt sich die Zündvorrichtung, z. B. eine Zündkerze in dem Vorkammerzündsystem, weniger stark auf, da die Wärme im unteren Teil (Deckelbereich) des Vorkammerzündsystems verbleibt. By integrating two different materials for the pre-chamber ignition system (thermal conductivity> 170 W / (m * K) for the housing and a thermal conductivity less than 170 W / (m * K) for the cover, each in the solution-annealed state (CuCrIZr) at 20 ° C) the low load for the externally ignited internal combustion engine and late ignition times (for example for heating an exhaust gas aftertreatment unit) can be realized, since only little energy is lost from the combustion in the prechamber ignition system on the way to the main combustion chamber. In addition, the ignition device heats up, e.g. Legs Spark plug in the prechamber ignition system, because the heat remains in the lower part (cover area) of the prechamber ignition system.
So wird der Deckel des Vorkammerzündsystems (Deckel ist der Teil, der von dem Vorkammerzündsystem weitgehend in den Brennraum steht) aus einem der oben genannten Materialien gefertigt. The cover of the prechamber ignition system (cover is the part that largely protrudes from the prechamber ignition system into the combustion chamber) is made from one of the above-mentioned materials.
Dieses andere Deckelmaterial wird gemäß Anspruch 2 an das Gehäuse angeschweißt, beispielsweise durch Reibschweißen oder in einem 3D Druckverfahren mit einander verschmolzen. This other cover material is welded to the housing according to claim 2, for example by friction welding or fused to one another in a 3D printing process.
Im Folgenden ist die Erfindung anhand eines Ausführungsbeispiels kurz erläutert. The invention is briefly explained below using an exemplary embodiment.
Fig. 1 zeigt einen Schnitt durch ein Vorkammerzündsystem. Fig. 1 shows a section through an antechamber ignition system.
Figur 1 zeigt einen Schnitt durch ein Vorkammerzündsystem 1 für eine fremd gezündete Flubkolben-Brennkraftmaschine, insbesondere eine Flochleistungs- Brennkraftmaschine, mit einem Gehäuse 2, welches in diesem Ausführungsbeispiel radial außen von einem Zylinderkopfmaterial eines Zylinderkopfes 3 der Flubkolben- Brennkraftmaschine gebildet ist. In dem Vorkammerzündsystem 1 ist eine Zündvorrichtung 4 angeordnet ist, die in einen Flohlraum 5 in dem Gehäuse 2 ragt. Als Zündvorrichtung kann beispielsweise eine Zündkerze, ein Corona-Zündsystem oder eine sonstige Zündvorrichtung für fremd gezündete Brennkraftmaschinen vorgesehen werden. Figure 1 shows a section through a prechamber ignition system 1 for an externally ignited floating piston internal combustion engine, in particular a floating piston internal combustion engine, with a housing 2, which in this embodiment is formed radially on the outside by a cylinder head material of a cylinder head 3 of the floating piston internal combustion engine. An ignition device 4 is arranged in the prechamber ignition system 1 and projects into a flea space 5 in the housing 2. For example, a spark plug, a corona ignition system or some other ignition device for externally ignited internal combustion engines can be provided as the ignition device.
Weiter ist der Flohlraum 5 auf der, der Zündvorrichtung 4 abgewandten Seite gegenüber einem Brennraum 6 der Flubkolben-Brennkraftmaschine von einem Deckel 7 abgedeckt. Der Deckel 7 weist zumindest einen ersten Durchbruch 8 auf, der den Flohlraum 5 und den Brennraum 6 Gas führend miteinander verbindet. In dem vorliegenden Ausführungsbeispiel sind zwei Durchbrüche 8 erkennbar. Diese Durchbrüche 8 können beispielsweise Bohrungen in dem Deckel 7 sein. Der Deckel 7 kann selber Stoff- und/oder formschlüssig oder in einem 3D-Druckverfahren mit dem Zylinderkopf 3 verbunden sein. Weiter ist in Fig. 1 ein Kraftstoffinjektor 9 erkennbar, mit dem Kraftstoff in den Brennraum 6 der Hubkolben-Brennkraftmaschine zur Darstellung eines brennbaren Kraftstoff-/Luftgemisches in dem Brennraum 6 einbringbar ist. Furthermore, the flea chamber 5 is covered by a cover 7 on the side facing away from the ignition device 4, opposite a combustion chamber 6 of the floating piston internal combustion engine. The cover 7 has at least one first opening 8 which connects the flea chamber 5 and the combustion chamber 6 to one another in a gas-carrying manner. In the present exemplary embodiment, two openings 8 can be seen. These openings 8 can be bores in the cover 7, for example. The cover 7 itself can be connected to the cylinder head 3 in a material and / or form-fitting manner or in a 3D printing process. A fuel injector 9 can also be seen in FIG. 1, with which fuel can be introduced into the combustion chamber 6 of the reciprocating piston internal combustion engine in order to produce a combustible fuel / air mixture in the combustion chamber 6.
Zusammen gefasst kann gesagt werden, dass das o. g. technische Problem gelöst wird, indem ein Kombinationswerkstoff für das Vorkammerzündsystem 1 eingesetzt wird. Der obere Teil des Vorkammerzündsystems 1 (im Bereich der Zündvorrichtung 4) bleibt ein sehr stark Wärme leitendes Material mit einer Wärmeleitfähigkeit vorzugweise > 170 W/(m*K), um die überschüssige Wärme an den Zylinderkopf 3 abgeben zu können. In summary it can be said that the above The technical problem is solved by using a combination material for the prechamber ignition system 1. The upper part of the prechamber ignition system 1 (in the area of the ignition device 4) remains a very highly thermally conductive material with a thermal conductivity preferably> 170 W / (m * K) in order to be able to give off the excess heat to the cylinder head 3.
Das Material des Deckels 7 des Vorkammerzündsystems 1 wird erfindungsgemäß so ausgelegt dass im Nennleistungspunkt (Bereich höchster Leistungsabgabe der Brennkraftmaschine) keine Vorentflammung entsteht aber so heiß wie möglich ist. Dazu eignen sich beispielsweise Materialen mit einer Wärmeleitfähigkeit < 170 W/(m*K), wie z.B. folgende Legierungen: The material of the cover 7 of the prechamber ignition system 1 is designed according to the invention in such a way that in the nominal power point (area of the highest power output of the internal combustion engine) no pre-ignition occurs but is as hot as possible. Materials with a thermal conductivity <170 W / (m * K), such as the following alloys, are suitable for this purpose:
• TZM, eine Molybdänlegierung, • TZM, a molybdenum alloy,
• Wolfram/CuCrIZr 50/50, • Tungsten / CuCrIZr 50/50,
• Nickel 2.4066, • nickel 2.4066,
• Inconel, eine hoch korrosions- und temperaturbeständige Nickellegierung oder• Inconel, a highly corrosion and temperature resistant nickel alloy or
• Stahl 1.4859 (20% Cr). • Steel 1.4859 (20% Cr).
Durch das Integrieren von zwei verschiedenen Materialien für das Vorkammerzündsystem 1 (Wärmeleitfähigkeit > 170 W/(m*K) für das Gehäuse 2 und einer Wärmeleitfähigkeit kleiner 170 W/(m*K) für den Deckel 7, jeweils im lösungsgeglühten Zustand (CuCrIZr) bei 20°C) können die Niedriglast für die fremd gezündete Brennkraftmaschine und späte Zündzeitpunkte realisiert werden, da nur wenig Energie von der Verbrennung in dem Vorkammerzündsystem 1 auf dem Weg in den Brennraum 6 verloren geht. Zudem heizt sich die Zündvorrichtung 4, z. B. eine Zündkerze in dem Vorkammerzündsystem 1 , weniger stark auf, da die Wärme im unteren Teil (Deckelbereich) des Vorkammerzündsystems 1 verbleibt. So wird erfindungsgemäß der Deckel des Vorkammerzündsystems 1 aus einem der oben genannten Materialien gefertigt und nicht aus dem Standardmaterial des Gehäuses 2. Abschließend sei noch gesagt, dass die erfindungsgemäße Ausgestaltung des Vorkammerzündsystems 1 sowohl für passive Vorkammerzündsysteme, wie hier dargestellt, als auch für aktive Vorkammerzündsysteme, mit eigener Einbringung von Kraftstoff in den Hohlraum 5, eingesetzt werden kann. In einem weiteren Ausführungsbeispiel kann das Gehäuse 2 anstelle von dem Zylinderkopfmaterial gebildet, auch als ein separates Gehäuse 2, welches in den Zylinderkopf 3 eingebracht wird, dargestellt werden. By integrating two different materials for the prechamber ignition system 1 (thermal conductivity> 170 W / (m * K) for the housing 2 and a thermal conductivity less than 170 W / (m * K) for the cover 7, each in the solution-annealed state (CuCrIZr) at 20 ° C.), the low load for the externally ignited internal combustion engine and retarded ignition times can be achieved, since only little energy is lost from the combustion in the prechamber ignition system 1 on the way into the combustion chamber 6. In addition, the ignition device 4, z. B. a spark plug in the prechamber ignition system 1, less because the heat in the lower part (cover area) of the prechamber ignition system 1 remains. Thus, according to the invention, the cover of the prechamber ignition system 1 is made from one of the above-mentioned materials and not from the standard material of the housing 2. Finally, it should be said that the inventive design of the prechamber ignition system 1 can be used both for passive prechamber ignition systems, as shown here, and for active prechamber ignition systems , with its own introduction of fuel into the cavity 5, can be used. In a further exemplary embodiment, the housing 2 can also be formed as a separate housing 2, which is introduced into the cylinder head 3, instead of the cylinder head material.
Bezugszeichenliste List of reference symbols
1. Vorkammerzündsystem1. Pre-chamber ignition system
2. Gehäuse 2. Housing
3. Zylinderkopf 3. cylinder head
4. Zündvorrichtung 4. Ignition device
5. Hohlraum 5. cavity
6. Brennraum 6. combustion chamber
7. Deckel 7. Lid
8. Durchbruch 8. Breakthrough
9. Kraftstoffinjektor 9. Fuel injector

Claims

Ansprüche Expectations
1. Fremd gezündete Hubkolben-Brennkraftmaschine mit einem Vorkammerzündsystem (1) mit einem Gehäuse (2), welches in einem Zylinderkopf (3) der Hubkolben-Brennkraftmaschine verbaubar ist und in dem eine Zündvorrichtung (4) angeordnet ist, die in einen Hohlraum (5) in dem Gehäuse (2) ragt, wobei der Hohlraum (5) gegenüber einem Brennraum (6) der Hubkolben-Brennkraftmaschine von einem Deckel (7) abgedeckt ist, wobei der Deckel (7) zumindest einen ersten Durchbruch (8) aufweist, der den Hohlraum (5) und den Brennraum (6) Gas führend miteinander verbindet, dadurch gekennzeichnet, dass das Gehäuse (2) aus einem Material mit einer Wärmeleitfähigkeit von größer 170 W/(m*K) und der Deckel (7) aus einem Material mit einer Wärmeleitfähigkeit kleiner 170 W/(m*K) besteht. 1. Externally ignited reciprocating internal combustion engine with a prechamber ignition system (1) with a housing (2) which can be installed in a cylinder head (3) of the reciprocating internal combustion engine and in which an ignition device (4) is arranged, which is inserted into a cavity (5 ) protrudes into the housing (2), the cavity (5) being covered by a cover (7) opposite a combustion chamber (6) of the reciprocating internal combustion engine, the cover (7) having at least one first opening (8) which connecting the cavity (5) and the combustion chamber (6) to one another in a gas-carrying manner, characterized in that the housing (2) is made of a material with a thermal conductivity of greater than 170 W / (m * K) and the cover (7) is made of one material with a thermal conductivity of less than 170 W / (m * K).
2. Hubkolben-Brennkraftmaschine nach Anspruch 1 , dadurch gekennzeichnet, dass das Gehäuse (2) und der Deckel (7) durch Schweißen oder 3D-Druck miteinander verbunden sind. 2. Reciprocating internal combustion engine according to claim 1, characterized in that the housing (2) and the cover (7) are connected to one another by welding or 3D printing.
EP21701428.1A 2020-02-14 2021-01-18 Spark-ignited reciprocating piston internal combustion engine with a pre-chamber ignition system Withdrawn EP4103826A1 (en)

Applications Claiming Priority (2)

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DE102020103863.1A DE102020103863B4 (en) 2020-02-14 2020-02-14 Spark-ignited reciprocating internal combustion engine with a pre-chamber ignition system
PCT/EP2021/050912 WO2021160374A1 (en) 2020-02-14 2021-01-18 Spark-ignited reciprocating piston internal combustion engine with a pre-chamber ignition system

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EP (1) EP4103826A1 (en)
CN (1) CN114746633A (en)
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WO (1) WO2021160374A1 (en)

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DE102020103863A1 (en) 2021-08-19
US20230070311A1 (en) 2023-03-09
DE102020103863B4 (en) 2023-04-27
WO2021160374A1 (en) 2021-08-19

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