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EP3371861B1 - Spark plug having an increased tightening torque - Google Patents

Spark plug having an increased tightening torque Download PDF

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Publication number
EP3371861B1
EP3371861B1 EP16787768.7A EP16787768A EP3371861B1 EP 3371861 B1 EP3371861 B1 EP 3371861B1 EP 16787768 A EP16787768 A EP 16787768A EP 3371861 B1 EP3371861 B1 EP 3371861B1
Authority
EP
European Patent Office
Prior art keywords
spark plug
recesses
housing
sealing surface
sealing ring
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.)
Active
Application number
EP16787768.7A
Other languages
German (de)
French (fr)
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EP3371861A1 (en
Inventor
Ba Thien Chuong VO
Chris Schimmel
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3371861A1 publication Critical patent/EP3371861A1/en
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Publication of EP3371861B1 publication Critical patent/EP3371861B1/en
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Classifications

    • 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
    • H01T13/02—Details
    • H01T13/08—Mounting, fixing or sealing of sparking plugs, e.g. in combustion chamber
    • 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

Definitions

  • the present invention relates to a spark plug which can be fixed in a cylinder head or the like of an internal combustion engine with an increased tightening torque.
  • Spark plugs are known from the prior art in different configurations. Spark plugs are usually screwed into a threaded bore in a cylinder head by means of a thread. Torques between 10 Nm and 30 Nm are usually applied when screwing the spark plug into the cylinder head bore.
  • the thread of the spark plug is usually provided on a housing of the spark plug. A seal between the housing and the cylinder head takes place, for example, via an outer sealing ring on the housing, which is provided in a folded form in section and is squeezed when the spark plug is screwed in. Due to the increasing requirements in the field of internal combustion engines, smaller engines with smaller cylinder heads and a more compact design have recently been increasingly used.
  • spark plugs are known from JP S55 78758 U , the DE 10 2012 207319 A1 and the CH 222 618 A .
  • JP S55 78758 U discloses a spark plug according to the preamble of claim 1.
  • the spark plug according to the invention with the features of claim 1 has the advantage that the spark plugs can be introduced into a cylinder head bore with high tightening torques despite reduced dimensions. There is no deformation of the threaded connection between the spark plug and the cylinder head. According to the invention, in particular an increased coefficient of friction is achieved between a sealing ring and the spark plug on the one hand and the sealing ring and the cylinder head bore on the other. This allows the spark plug to be more resistant to twisting. According to the invention, this is achieved in that the spark plug comprises an insulator, a housing with a sealing surface and a sealing ring. The sealing ring rests against the sealing surface of the housing and the sealing surface has a large number of recesses.
  • the multiplicity of recesses on the sealing surface means that when the spark plug is screwed into the cylinder head bore, the sealing ring is plastically deformed and partially and/or completely fills the recesses in the sealing surface. In this way, not only is an improved frictional connection between the sealing ring and the housing of the spark plug achieved, but also a partial or complete positive connection on the sealing ring. As a result, increased coefficients of friction can be achieved.
  • the coefficient of friction is advantageously at least 0.25.
  • the recesses in the sealing surface are preferably open to an outer circumference of the housing of the spark plug. In this way, in particular, a simpler plastic deformation of the sealing ring is made possible during screwing. Furthermore, if necessary, excess plastically deformed material of the sealing ring can escape on the open side of the recess.
  • the sealing surface is provided on a peripheral projection of the housing. In this way, in particular, a good seal between the spark plug and the cylinder head can be achieved.
  • the sealing surface is arranged on a casing area of the housing provided perpendicular to the axial direction of the spark plug.
  • an outer sealing ring is also used for fixing and sealing the spark plug on the cylinder head bore.
  • the recesses are arranged at regular intervals in the circumferential direction on the sealing surface. This ensures an even coefficient of friction along the circumference between the sealing ring and the housing.
  • a thickness of the sealing ring is greater than a depth of the recesses in the sealing surface.
  • the thickness is greater than a depth of the recesses by a factor in a range of 4 to 6.
  • an outer circumference of the sealing surface corresponds to the largest diameter of the spark plug housing. This allows a large sealing surface area between the sealing ring and the housing of the spark plug.
  • a sudden transition is preferably provided between the recesses and the sealing surface. As a result, particularly high coefficients of friction between the sealing ring and the sealing surface can be achieved in the assembled state.
  • An even number of recesses in particular between 4 and 10 recesses, are preferably provided on the sealing surface.
  • the housing has a metric ISO thread M10 or an M8 according to DIN 13-1, issue 11.1999.
  • the dimensions of the housing and thus of the entire spark plug can be reduced, so that it is particularly suitable for small engines with restricted space.
  • the present invention relates to an internal combustion engine with a spark plug according to the invention, a metric M10 thread or a metric M8 thread according to DIN 13-1, issue 11.1999, being provided between the spark plug and a cylinder head of the internal combustion engine.
  • the spark plug 1 includes an insulator 2, which is usually made of a ceramic material. Furthermore, a housing 3 is provided, which is provided from a metal material. Numeral 8 denotes a center electrode, and numeral 9 denotes a ground electrode. the figure 1 shows the spark plug in section in the axial direction XX.
  • the spark plug 1 also includes a sealing surface 4 which is provided on the housing 3 .
  • the sealing surface 4 is perpendicular to the axial direction XX aligned.
  • the sealing surface 4 is provided on a projection 30 of the housing 3 .
  • An outer circumference 40 in the area of the projection 30 is larger than a diameter of an external thread 41 for fixing the spark plug in a cylinder head.
  • the outer circumference 40 provides the largest diameter of the housing 3 .
  • the sealing surface 4 has a large number of recesses 5 .
  • eight recesses 5 are provided.
  • the recesses 5 have an arcuate shape and are open in the direction of the outer circumference 40 (cf. figure 3 and 4 ).
  • the recesses 5 can also be wedge-shaped, with the wedge-shaped recess 5 extending from the outer circumference 40 in the direction of the longitudinal axis of the spark plug.
  • the tip of the wedge-shaped recess 5 is arranged in the direction of the longitudinal axis of the spark plug and the base of the wedge-shaped recess 5 is arranged in the direction of the outer circumference 40 , the base of the wedge-shaped recess 5 being open in the direction of the outer circumference 40 .
  • a sudden transition 7 is provided between the recesses 5 and the sealing surface 4 in each case.
  • a base surface 50 of the recesses 5 is parallel to the surface of the sealing surfaces 4.
  • the spark plug 1 includes a sealing ring 6.
  • the sealing ring 6 bears against the sealing surface 4 in the installed state.
  • the sealing ring 6 has a rectangular cross section, in particular a square cross section.
  • a thickness D of the sealing ring 6 in the axial direction X-X of the spark plug is greater than a depth T of the recess 5 in the axial direction X-X.
  • the depth of the recesses is preferably in a range of 0.1 to 1 mm.
  • FIG 2 shows the state of the spark plug in which the sealing ring 6 is placed loosely on the sealing surface 4.
  • the recesses 5 with depth T are clearly visible.
  • screwing the spark plug 1 into a not-shown cylinder head bore with an internal thread now takes place as soon as the sealing ring 6 on rests on a bearing surface of the cylinder head, a plastic deformation of the sealing ring 6 in such a way that it partially or completely fills the recesses 5 .
  • the recesses 5 are designed to be open to the radial outside (cf. figure 3 ), Excess, plastically deformed material of the sealing ring 6 can therefore also flow out to the outside.
  • a positive connection between the plastically deformed sealing ring 6 and the recesses 5 is thus achieved during the screwing-in process in addition to the non-positive connection between the sealing surface 4 and the sealing ring 6 .
  • This also enables a higher coefficient of friction between the sealing ring and the housing 3 .
  • a sum of all areas of the recesses 5 corresponds to approximately 50% of the total area of the area of the sealing ring 6 directed towards the sealing area 4 .
  • the recesses 5 are preferably produced by means of a forming process with a correspondingly shaped stamp.
  • a surface of the sealing surface 4 and the recesses 5 is designed with a predetermined roughness. As a result, a coefficient of friction can be further increased.
  • the coefficient of friction is advantageously at least 0.25.
  • a spark plug for smaller internal combustion engines with a relatively small thread can be provided which, despite the smaller metric thread (e.g. M8 or M10), can be fixed with an increased tightening torque.
  • the smaller metric thread e.g. M8 or M10

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Description

Stand der TechnikState of the art

Die vorliegende Erfindung betrifft eine Zündkerze, welche mit einem erhöhten Anzugsdrehmoment in einem Zylinderkopf oder dgl. einer Brennkraftmaschine fixiert werden kann.The present invention relates to a spark plug which can be fixed in a cylinder head or the like of an internal combustion engine with an increased tightening torque.

Zündkerzen sind aus dem Stand der Technik in unterschiedlichen Ausgestaltungen bekannt. Zündkerzen werden üblicherweise mittels eines Gewindes in eine Gewindebohrung in einem Zylinderkopf eingedreht. Beim Eindrehen der Zündkerze in die Zylinderkopfbohrung werden in der Regel Drehmomente zwischen 10 Nm bis 30 Nm aufgebracht. Das Gewinde der Zündkerze ist üblicherweise an einem Gehäuse der Zündkerze vorgesehen. Eine Abdichtung zwischen dem Gehäuse und dem Zylinderkopf erfolgt z.B. über einen äußeren Dichtring am Gehäuse, welcher im Schnitt in einer gefalteten Form vorgesehen ist und beim Eindrehen der Zündkerze gequetscht wird. Aufgrund der ansteigenden Anforderungen im Bereich von Brennkraftmaschinen werden in jüngster Zeit verstärkt kleinere Motoren mit kleineren Zylinderköpfen und einem kompakteren Aufbau verwendet. Hierbei benötigt man jedoch kleinere Zündkerzen, welche von den Gewindegrößen M14 und M12 auf die Gewindegrößen M10 und M8 übergehen. Hierdurch kann es jedoch beim Eindrehen der Zündkerze in die Zylinderkopfbohrung aufgrund der kleineren Größe des Gewindes zu einer plastischen Verformung am Gewinde bis hin zu einem Riss am Zündkerzengehäuse kommen. Für eine sichere Fixierung der Zündkerze muss diese jedoch mit einem vorbestimmten Mindestdrehmoment in den Zylinderkopf eingebracht werden, da ansonsten Undichtigkeiten sowie ein unbeabsichtigtes Lösen der Zündkerze auftreten könnte.Spark plugs are known from the prior art in different configurations. Spark plugs are usually screwed into a threaded bore in a cylinder head by means of a thread. Torques between 10 Nm and 30 Nm are usually applied when screwing the spark plug into the cylinder head bore. The thread of the spark plug is usually provided on a housing of the spark plug. A seal between the housing and the cylinder head takes place, for example, via an outer sealing ring on the housing, which is provided in a folded form in section and is squeezed when the spark plug is screwed in. Due to the increasing requirements in the field of internal combustion engines, smaller engines with smaller cylinder heads and a more compact design have recently been increasingly used. However, this requires smaller spark plugs, which go from thread sizes M14 and M12 to thread sizes M10 and M8. However, due to the smaller size of the thread, this can lead to plastic deformation of the thread and even a crack in the spark plug housing when screwing the spark plug into the cylinder head bore. In order to securely fix the spark plug, however, it must be inserted into the cylinder head with a predetermined minimum torque, since otherwise leaks and unintentional loosening of the spark plug could occur.

Weiterhin sind Zündkerzen bekannt aus der JP S55 78758 U , der DE 10 2012 207319 A1 und der CH 222 618 A .Furthermore, spark plugs are known from JP S55 78758 U , the DE 10 2012 207319 A1 and the CH 222 618 A .

Das Dokument JP S55 78758 U offenbart eine Zündkerze gemäß dem Oberbegriff des Anspruchs 1.The document JP S55 78758 U discloses a spark plug according to the preamble of claim 1.

Offenbarung der ErfindungDisclosure of Invention

Die erfindungsgemäße Zündkerze mit den Merkmalen des Anspruchs 1 weist demgegenüber den Vorteil auf, dass die Zündkerzen trotz reduzierten Abmessungen mit hohen Anzugsdrehmomenten in einer Zylinderkopfbohrung eingebracht werden können. Hierbei treten keine Verformungen der Gewindeverbindung zwischen Zündkerze und Zylinderkopf auf. Erfindungsgemäß wird insbesondere ein vergrößerter Reibwert zwischen einem Dichtring und der Zündkerze einerseits und dem Dichtring und der Zylinderkopfbohrung andererseits erreicht. Hierdurch kann eine erhöhte Abdrehfestigkeit der Zündkerze erreicht werden. Dies wird erfindungsgemäß dadurch erreicht, dass die Zündkerze einen Isolator, ein Gehäuse mit einer Dichtfläche und einen Dichtring umfasst. Der Dichtring liegt an der Dichtfläche des Gehäuses an und die Dichtfläche weist eine Vielzahl von Ausnehmungen auf. Durch die Vielzahl von Ausnehmungen an der Dichtfläche wird erreicht, dass sich beim Eindrehen der Zündkerze in die Zylinderkopfbohrung der Dichtring plastisch verformt und teilweise und/oder vollständig die Ausnehmungen in der Dichtfläche ausfüllt. Hierdurch wird insbesondere nicht nur ein verbesserter Reibschluss zwischen Dichtring und Gehäuse der Zündkerze erreicht, sondern auch ein teilweise oder vollständiger Formschluss am Dichtring. Dadurch können erhöhte Reibwerte erreicht werden. Vorteilhafterweise beträgt der Reibwert mindestens 0,25.The spark plug according to the invention with the features of claim 1 has the advantage that the spark plugs can be introduced into a cylinder head bore with high tightening torques despite reduced dimensions. There is no deformation of the threaded connection between the spark plug and the cylinder head. According to the invention, in particular an increased coefficient of friction is achieved between a sealing ring and the spark plug on the one hand and the sealing ring and the cylinder head bore on the other. This allows the spark plug to be more resistant to twisting. According to the invention, this is achieved in that the spark plug comprises an insulator, a housing with a sealing surface and a sealing ring. The sealing ring rests against the sealing surface of the housing and the sealing surface has a large number of recesses. The multiplicity of recesses on the sealing surface means that when the spark plug is screwed into the cylinder head bore, the sealing ring is plastically deformed and partially and/or completely fills the recesses in the sealing surface. In this way, not only is an improved frictional connection between the sealing ring and the housing of the spark plug achieved, but also a partial or complete positive connection on the sealing ring. As a result, increased coefficients of friction can be achieved. The coefficient of friction is advantageously at least 0.25.

Die Unteransprüche zeigen bevorzugte Weiterbildungen der Erfindung.The dependent claims show preferred developments of the invention.

Vorzugsweise sind die Ausnehmungen in der Dichtfläche zu einem Außenumfang des Gehäuses der Zündkerze offen. Hierdurch wird insbesondere eine einfachere plastische Verformung des Dichtrings während des Eindrehens ermöglicht. Weiterhin kann gegebenenfalls überschüssiges plastisch verformtes Material des Dichtrings an der offenen Seite der Ausnehmung austreten.The recesses in the sealing surface are preferably open to an outer circumference of the housing of the spark plug. In this way, in particular, a simpler plastic deformation of the sealing ring is made possible during screwing. Furthermore, if necessary, excess plastically deformed material of the sealing ring can escape on the open side of the recess.

Weiter bevorzugt ist die Dichtfläche an einem umlaufenden Vorsprung des Gehäuses vorgesehen. Hierdurch kann insbesondere eine gute Abdichtung zwischen Zündkerze und Zylinderkopf erreicht werden.More preferably, the sealing surface is provided on a peripheral projection of the housing. In this way, in particular, a good seal between the spark plug and the cylinder head can be achieved.

Erfindungsgemäß ist die Dichtfläche an einem senkrecht zur Axialrichtung der Zündkerze vorgesehenen Mantelbereich des Gehäuses angeordnet. Hierdurch wird erfindungsgemäß auch ein äußerer Dichtring zur Fixierung und Abdichtung der Zündkerze an der Zylinderkopfbohrung verwendet.According to the invention, the sealing surface is arranged on a casing area of the housing provided perpendicular to the axial direction of the spark plug. As a result, according to the invention, an outer sealing ring is also used for fixing and sealing the spark plug on the cylinder head bore.

Gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung sind die Ausnehmungen in gleichmäßigen Abständen in Umfangsrichtung an der Dichtfläche angeordnet. Dadurch wird ein gleichmäßiger Reibwert entlang des Umfangs zwischen Dichtring und Gehäuse sichergestellt.According to a further preferred embodiment of the present invention, the recesses are arranged at regular intervals in the circumferential direction on the sealing surface. This ensures an even coefficient of friction along the circumference between the sealing ring and the housing.

Gemäß der Erfindung ist eine Dicke des Dichtrings größer als eine Tiefe der Ausnehmungen in der Dichtfläche. Vorzugsweise ist die Dicke um einen Faktor in einem Bereich von 4 bis 6 größer als eine Tiefe der Ausnehmungen.According to the invention, a thickness of the sealing ring is greater than a depth of the recesses in the sealing surface. Preferably, the thickness is greater than a depth of the recesses by a factor in a range of 4 to 6.

Gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung entspricht ein Außenumfang der Dichtfläche dem größten Durchmesser des Gehäuses der Zündkerze. Dadurch kann ein großer Dichtflächenbereich zwischen Dichtring und Gehäuse der Zündkerze ermöglicht werden.According to a further preferred embodiment of the present invention, an outer circumference of the sealing surface corresponds to the largest diameter of the spark plug housing. This allows a large sealing surface area between the sealing ring and the housing of the spark plug.

Bevorzugt ist zwischen den Ausnehmungen und der Dichtfläche ein sprunghafter Übergang vorgesehen. Hierdurch können besonders hohe Reibwerte zwischen Dichtring und Dichtfläche im montierten Zustand erreicht werden.A sudden transition is preferably provided between the recesses and the sealing surface. As a result, particularly high coefficients of friction between the sealing ring and the sealing surface can be achieved in the assembled state.

Vorzugsweise sind an der Dichtfläche eine gerade Zahl von Ausnehmungen, insbesondere zwischen 4 und 10 Ausnehmungen, vorgesehen.An even number of recesses, in particular between 4 and 10 recesses, are preferably provided on the sealing surface.

Ferner weist das Gehäuse erfindungsgemäß ein metrisches ISO-Gewinde M10 oder ein M8 gemäß DIN 13-1, Ausgabe 11.1999, auf. Dadurch können die Abmessungen des Gehäuses und somit der gesamten Zündkerze reduziert werden, so dass diese insbesondere für kleinbauende Motoren mit beengten Platzverhältnissen geeignet ist.Furthermore, according to the invention, the housing has a metric ISO thread M10 or an M8 according to DIN 13-1, issue 11.1999. As a result, the dimensions of the housing and thus of the entire spark plug can be reduced, so that it is particularly suitable for small engines with restricted space.

Ferner betrifft die vorliegende Erfindung eine Brennkraftmaschine mit einer erfindungsgemäßen Zündkerze, wobei zwischen der Zündkerze und einem Zylinderkopf der Brennkraftmaschine ein metrisches M10-Gewinde oder ein metrisches M8-Gewinde gemäß DIN 13-1, Ausgabe 11.1999, vorgesehen ist.Furthermore, the present invention relates to an internal combustion engine with a spark plug according to the invention, a metric M10 thread or a metric M8 thread according to DIN 13-1, issue 11.1999, being provided between the spark plug and a cylinder head of the internal combustion engine.

Zeichnungdrawing

Nachfolgend wird ein bevorzugtes Ausführungsbeispiel der Erfindung unter Bezugnahme auf die begleitende Zeichnung im Detail beschrieben. In der Zeichnung ist:

Figur 1
eine schematische, teilweise geschnittene Ansicht einer Zündkerze gemäß einem bevorzugten Ausführungsbeispiel der Erfindung,
Figur 2
eine schematische Seitenansicht eines Gehäuses der Zündkerze von Figur 1 mit eingelegtem Dichtring,
Figur 3
eine schematische, perspektivische Ansicht des Gehäuses von Figur 2 ohne Dichtring, und
Figur 4
eine schematische Schnittansicht eines Gehäuses der Zündkerze von Figur 1.
A preferred embodiment of the invention is described in detail below with reference to the accompanying drawings. In the drawing is:
figure 1
a schematic, partially sectioned view of a spark plug according to a preferred embodiment of the invention,
figure 2
a schematic side view of a housing of the spark plug of figure 1 with inserted sealing ring,
figure 3
a schematic perspective view of the housing of figure 2 without sealing ring, and
figure 4
a schematic sectional view of a housing of the spark plug of figure 1 .

Bevorzugte Ausführungsform der ErfindungPreferred embodiment of the invention

Nachfolgend wird unter Bezugnahme auf die Figuren 1 bis 4 eine Zündkerze 1 gemäß einem ersten bevorzugten Ausführungsbeispiel der Erfindung im Detail beschrieben.In the following, with reference to the Figures 1 to 4 a spark plug 1 according to a first preferred embodiment of the invention is described in detail.

Die Zündkerze 1 umfasst einen Isolator 2, welcher üblicherweise aus einem Keramikmaterial hergestellt ist. Ferner ist ein Gehäuse 3 vorgesehen, welches aus einem Metallmaterial vorgesehen ist. Das Bezugszeichen 8 bezeichnet eine Mittelelektrode und das Bezugszeichen 9 eine Masseelektrode. Die Figur 1 zeigt die Zündkerze im Schnitt in Axialrichtung X-X.The spark plug 1 includes an insulator 2, which is usually made of a ceramic material. Furthermore, a housing 3 is provided, which is provided from a metal material. Numeral 8 denotes a center electrode, and numeral 9 denotes a ground electrode. the figure 1 shows the spark plug in section in the axial direction XX.

Die Zündkerze 1 umfasst ferner eine Dichtfläche 4, welche am Gehäuse 3 vorgesehen ist. Die Dichtfläche 4 ist dabei senkrecht zur Axialrichtung X-X ausgerichtet. Die Dichtfläche 4 ist an einem Vorsprung 30 des Gehäuses 3 vorgesehen. Ein Außenumfang 40 im Bereich des Vorsprungs 30 ist dabei größer als ein Durchmesser eines Außengewindes 41 zur Fixierung der Zündkerze in einem Zylinderkopf. Der Außenumfang 40 stellt dabei den größten Durchmesser des Gehäuses 3 bereit.The spark plug 1 also includes a sealing surface 4 which is provided on the housing 3 . The sealing surface 4 is perpendicular to the axial direction XX aligned. The sealing surface 4 is provided on a projection 30 of the housing 3 . An outer circumference 40 in the area of the projection 30 is larger than a diameter of an external thread 41 for fixing the spark plug in a cylinder head. The outer circumference 40 provides the largest diameter of the housing 3 .

Wie insbesondere aus Figur 3 ersichtlich ist, weist die Dichtfläche 4 eine Vielzahl von Ausnehmungen 5 auf. In diesem Ausführungsbeispiel sind acht Ausnehmungen 5 vorgesehen. Die Ausnehmungen 5 weisen eine bogenförmige Form auf und sind in Richtung zum Außenumfang 40 offen (vgl. Figur 3 und 4). Alternative können die Ausnehmungen 5 auch eine keilförmige Form aufweisen, wobei sich die keilförmige Ausnehmung 5 vom Außenumfang 40 in Richtung der Zündkerzen Längsachse erstreckt. Dabei ist die Spitze der keilförmigen Ausnehmung 5 in Richtung Zündkerzen Längsachse und die Basis der keilförmigen Ausnehmung 5 in Richtung Außenumfang 40 angeordnet, wobei die die Basis der keilförmigen Ausnehmung 5 in Richtung zum Außenumfang 40 offen ist.Like in particular figure 3 As can be seen, the sealing surface 4 has a large number of recesses 5 . In this embodiment, eight recesses 5 are provided. The recesses 5 have an arcuate shape and are open in the direction of the outer circumference 40 (cf. figure 3 and 4 ). Alternatively, the recesses 5 can also be wedge-shaped, with the wedge-shaped recess 5 extending from the outer circumference 40 in the direction of the longitudinal axis of the spark plug. The tip of the wedge-shaped recess 5 is arranged in the direction of the longitudinal axis of the spark plug and the base of the wedge-shaped recess 5 is arranged in the direction of the outer circumference 40 , the base of the wedge-shaped recess 5 being open in the direction of the outer circumference 40 .

Zwischen den Ausnehmungen 5 und der Dichtfläche 4 ist jeweils ein sprunghafter Übergang 7 vorgesehen. Eine Grundfläche 50 der Ausnehmungen 5 ist dabei parallel zur Fläche der Dichtflächen 4.A sudden transition 7 is provided between the recesses 5 and the sealing surface 4 in each case. A base surface 50 of the recesses 5 is parallel to the surface of the sealing surfaces 4.

Wie weiter aus Figur 1 ersichtlich ist, umfasst die Zündkerze 1 einen Dichtring 6. Der Dichtring 6 liegt im montierten Zustand an der Dichtfläche 4 an. Der Dichtring 6 weist einen rechteckigen Querschnitt, insbesondere einen quadratischen Querschnitt, auf.How further from figure 1 As can be seen, the spark plug 1 includes a sealing ring 6. The sealing ring 6 bears against the sealing surface 4 in the installed state. The sealing ring 6 has a rectangular cross section, in particular a square cross section.

Eine Dicke D des Dichtrings 6 in Axialrichtung X-X der Zündkerze ist dabei größer als eine Tiefe T der Ausnehmung 5 in Axialrichtung X-X.A thickness D of the sealing ring 6 in the axial direction X-X of the spark plug is greater than a depth T of the recess 5 in the axial direction X-X.

Die Tiefe der Ausnehmungen ist vorzugsweise in einem Bereich von 0,1 bis 1 mm.The depth of the recesses is preferably in a range of 0.1 to 1 mm.

Figur 2 zeigt den Zustand der Zündkerze, in welchem der Dichtring 6 lose auf die Dichtfläche 4 aufgelegt ist. Hierbei sind deutlich die Ausnehmungen 5 mit Tiefe T erkennbar. Beim Eindrehen der Zündkerze 1 in eine nicht gezeigte Zylinderkopfbohrung mit Innengewinde erfolgt nun, sobald der Dichtring 6 an einer Auflagefläche des Zylinderkopfs aufliegt, eine plastische Verformung des Dichtrings 6 derart, dass dieser teilweise oder vollständig die Ausnehmungen 5 ausfüllt. Da die Ausnehmungen 5 zur radialen Außenseite offen ausgestaltet sind (vgl. Figur 3), kann somit gegebenenfalls auch überschüssiges, plastisch verformtes Material des Dichtrings 6 nach außen abfließen. figure 2 shows the state of the spark plug in which the sealing ring 6 is placed loosely on the sealing surface 4. Here, the recesses 5 with depth T are clearly visible. When screwing the spark plug 1 into a not-shown cylinder head bore with an internal thread, now takes place as soon as the sealing ring 6 on rests on a bearing surface of the cylinder head, a plastic deformation of the sealing ring 6 in such a way that it partially or completely fills the recesses 5 . Since the recesses 5 are designed to be open to the radial outside (cf. figure 3 ), Excess, plastically deformed material of the sealing ring 6 can therefore also flow out to the outside.

Erfindungsgemäß wird somit während des Eindrehvorgangs neben der kraftschlüssigen Verbindung zwischen der Dichtfläche 4 und dem Dichtring 6 auch eine formschlüssige Verbindung zwischen dem plastisch verformten Dichtring 6 und den Ausnehmungen 5 erreicht. Hierdurch wird auch ein höherer Reibwert zwischen Dichtring und Gehäuse 3 ermöglicht. Dies führt zu einer deutlich erhöhten Abdrehfestigkeit der Zündkerze, somit kann die Zündkerze, auch bei einem kleineren Gewindedurchmesser des Außengewindes 41, z.B. M8 oder M10 (metrische Gewinde DIN 13-1, Ausgabe 11.1999), mit einem hohen Anzugsdrehmoment im Zylinderkopf fixiert werden, ohne dass es zu einer Beschädigung der Gewindegänge oder gar zu einem Riss des Gehäuses 3 kommt.According to the invention, a positive connection between the plastically deformed sealing ring 6 and the recesses 5 is thus achieved during the screwing-in process in addition to the non-positive connection between the sealing surface 4 and the sealing ring 6 . This also enables a higher coefficient of friction between the sealing ring and the housing 3 . This leads to a significantly increased resistance to twisting of the spark plug, so the spark plug can be fixed in the cylinder head with a high tightening torque, even with a smaller thread diameter of the external thread 41, e.g that there is damage to the threads or even a crack in the housing 3.

Es sei angemerkt, dass eine Summe aller Flächen der Ausnehmungen 5 ungefähr 50% der Gesamtfläche der zur Dichtfläche 4 gerichteten Fläche des Dichtrings 6 entspricht.It should be noted that a sum of all areas of the recesses 5 corresponds to approximately 50% of the total area of the area of the sealing ring 6 directed towards the sealing area 4 .

Die Ausnehmungen 5 werden vorzugsweise mittels eines Umformverfahrens mit einem entsprechend ausgeformten Stempel erzeugt.The recesses 5 are preferably produced by means of a forming process with a correspondingly shaped stamp.

Weiter bevorzugt ist eine Oberfläche der Dichtfläche 4 und der Ausnehmungen 5 mit einer vorbestimmten Rauhheit ausgeführt. Hierdurch kann ein Reibwert weiter erhöht werden. Vorteilhafterweise beträgt der Reibwert mindestens 0,25.More preferably, a surface of the sealing surface 4 and the recesses 5 is designed with a predetermined roughness. As a result, a coefficient of friction can be further increased. The coefficient of friction is advantageously at least 0.25.

Somit kann erfindungsgemäß eine Zündkerze für kleinere Brennkraftmaschinen mit relativ kleinem Gewinde bereitgestellt werden, welche trotz des kleineren metrischen Gewindes (z.B. M8 oder M10) mit erhöhtem Anzugsdrehmoment fixiert werden kann.Thus, according to the invention, a spark plug for smaller internal combustion engines with a relatively small thread can be provided which, despite the smaller metric thread (e.g. M8 or M10), can be fixed with an increased tightening torque.

Claims (8)

  1. Spark plug comprising:
    - an insulator (2),
    - a housing (3) with a sealing surface (4), and
    - an outer sealing ring (6) which rests against the sealing surface (4) and is designed to secure and seal off the spark plug at a cylinder head bore, wherein the sealing surface (4) is arranged on a casing region of the housing (3) provided perpendicularly to the axial direction (X-X) of the spark plug,
    - wherein the sealing surface (4) has a large number of recesses (5),
    - characterized in that
    a thickness (D) of the sealing ring in the axial direction (X-X) of the spark plug is greater than a depth (T) of the recesses (5) in the axial direction (X-X) of the spark plug, and in that an external thread in the form of an M10 or M8 metric thread is provided on the housing.
  2. Spark plug according to Claim 1, characterized in that the recesses (5) are open to an outer circumference (40) of the housing (3).
  3. Spark plug according to either of the preceding claims, characterized in that the sealing surface (4) on the housing (3) is provided on an encircling projection (30) of the housing.
  4. Spark plug according to one of the preceding claims, characterized in that the recesses (5) are arranged at equal distances in the circumferential direction.
  5. Spark plug according to one of the preceding claims, characterized in that an outer circumference (40) of the sealing surface corresponds to the maximum diameter of the housing (3).
  6. Spark plug according to one of the preceding claims, characterized in that an abrupt transition (7) is provided between the recesses (5) and the sealing surface (3) .
  7. Spark plug according to one of the preceding claims, characterized in that the number of recesses is an even number, in particular in a range of from 4 to 10 recesses.
  8. Internal combustion engine comprising a spark plug according to one of the preceding claims and a metric M8 thread connection or a metric M10 thread connection between the spark plug and the cylinder head.
EP16787768.7A 2015-11-02 2016-10-20 Spark plug having an increased tightening torque Active EP3371861B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015221394.3A DE102015221394B4 (en) 2015-11-02 2015-11-02 Spark plug with increased tightening torque and internal combustion engine
PCT/EP2016/075168 WO2017076650A1 (en) 2015-11-02 2016-10-20 Spark plug having an increased tightening torque

Publications (2)

Publication Number Publication Date
EP3371861A1 EP3371861A1 (en) 2018-09-12
EP3371861B1 true EP3371861B1 (en) 2022-09-07

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EP16787768.7A Active EP3371861B1 (en) 2015-11-02 2016-10-20 Spark plug having an increased tightening torque

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US (1) US10340665B2 (en)
EP (1) EP3371861B1 (en)
DE (1) DE102015221394B4 (en)
ES (1) ES2932559T3 (en)
WO (1) WO2017076650A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11002218B2 (en) * 2018-08-23 2021-05-11 Ford Global Technologies, Llc Notched spark plug
DE102020209858A1 (en) * 2020-08-05 2022-02-10 Robert Bosch Gesellschaft mit beschränkter Haftung Spark plug with sealing washer and sealing washer for a spark plug
DE102021205445A1 (en) * 2021-05-28 2022-12-01 Robert Bosch Gesellschaft mit beschränkter Haftung Tool for removing a sealing ring from a spark plug

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1526617A2 (en) * 2003-10-24 2005-04-27 Denso Corporation Spark plug

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CH222618A (en) 1940-09-09 1942-07-31 Bosch Gmbh Robert Spark plug.
US2330807A (en) * 1940-10-12 1943-10-05 Carl E Berstler Spark plug
US4007714A (en) * 1975-10-14 1977-02-15 Curtiss-Wright Corporation Spark plug and rotary engine combination
JPS5578758U (en) 1978-11-24 1980-05-30
US5188495A (en) 1992-02-28 1993-02-23 Illinois Tool Works Inc. Fastener assembly useful as drain plug
DE19649742B4 (en) 1995-12-08 2007-02-15 Volkswagen Ag Pipe socket or the like with a flange having a sealing surface
US5937813A (en) 1998-04-29 1999-08-17 Shifflette; J. Michael Resettable pressure relieving spark plug
DE102010003574B4 (en) 2010-03-31 2012-02-09 Schwäbische Hüttenwerke Automotive GmbH Press assembly and method for producing a press composite
CN201973041U (en) 2011-01-19 2011-09-14 深圳创维数字技术股份有限公司 Fixed screw for installation
DE102012207319A1 (en) 2012-05-03 2013-11-07 Robert Bosch Gmbh Spark plug and method of making a spark plug

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
EP1526617A2 (en) * 2003-10-24 2005-04-27 Denso Corporation Spark plug

Also Published As

Publication number Publication date
ES2932559T3 (en) 2023-01-20
EP3371861A1 (en) 2018-09-12
US10340665B2 (en) 2019-07-02
DE102015221394A1 (en) 2017-05-04
US20180323582A1 (en) 2018-11-08
WO2017076650A1 (en) 2017-05-11
DE102015221394B4 (en) 2024-02-01

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