EP3371861A1 - Spark plug having an increased tightening torque - Google Patents

Spark plug having an increased tightening torque

Info

Publication number
EP3371861A1
EP3371861A1 EP16787768.7A EP16787768A EP3371861A1 EP 3371861 A1 EP3371861 A1 EP 3371861A1 EP 16787768 A EP16787768 A EP 16787768A EP 3371861 A1 EP3371861 A1 EP 3371861A1
Authority
EP
European Patent Office
Prior art keywords
spark plug
recesses
housing
sealing surface
plug according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16787768.7A
Other languages
German (de)
French (fr)
Other versions
EP3371861B1 (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
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3371861A1 publication Critical patent/EP3371861A1/en
Application granted granted Critical
Publication of EP3371861B1 publication Critical patent/EP3371861B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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 with an increased tightening torque in a cylinder head or the like of an internal combustion engine.
  • Spark plugs are usually screwed by means of a thread into a threaded bore in a cylinder head.
  • torques between 10 Nm to 30 Nm are usually applied.
  • 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 occurs e.g. via an outer sealing ring on the housing, which is provided in section in a folded shape and is squeezed when screwing the spark plug.
  • Thread sizes M10 and M8 go over. However, this can lead to a crack on the spark plug housing when screwing the spark plug into the cylinder head bore due to the smaller size of the thread to a plastic deformation of the thread. For a secure fixation of the spark plug, however, this must be introduced with a predetermined minimum torque in the cylinder head, otherwise leaks and accidental release of the spark plug could occur. Disclosure of the invention
  • the spark plug according to the invention with the features of claim 1 has the advantage that the spark plugs despite reduced
  • Cylinder head bore on the other hand achieved. This can be an increased
  • the spark plug can be achieved.
  • the spark plug comprises an insulator, a housing having a sealing surface and a sealing ring.
  • the sealing ring bears against the sealing surface of the housing and the sealing surface has a multiplicity of recesses. Due to the plurality of recesses on the sealing surface is achieved that plastically deformed when screwing the spark plug into the cylinder head bore of the sealing ring and partially and / or completely fills the recesses in the sealing surface.
  • the coefficient of friction is at least 0.25.
  • the recesses in the sealing surface to a
  • the sealing surface is provided on a circumferential 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 preferably arranged on a jacket region of the housing which is perpendicular to the axial direction of the spark plug. This is also a Outer sealing ring for fixing and sealing the spark plug to the
  • the recesses are arranged at uniform intervals in the circumferential direction on the sealing surface. This ensures a uniform 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
  • the thickness is greater by a factor in a range of 4 to 6 than a depth of the recesses.
  • an outer circumference of the sealing surface corresponds to the largest diameter of the housing of the spark plug.
  • a sudden transition is provided between the recesses and the sealing surface.
  • particularly high coefficients of friction between the sealing ring and sealing surface can be achieved in the mounted state.
  • an even number of recesses in particular between 4 and 10 recesses, are provided on the sealing surface.
  • the housing preferably has a metric ISO thread M10 or M8 according to DIN 13-1, edition 1 1.1999, on. This allows the
  • the present invention relates to an internal combustion engine with a spark plug according to the invention, wherein between the spark plug and a cylinder head of the internal combustion engine, a metric M10 thread or a metric M8 thread according to DIN 13-1, Issue 1 1 .1999, is provided drawing
  • Figure 1 is a schematic, partially sectioned view of a
  • Figure 2 is a schematic side view of a housing of
  • Figure 3 is a schematic, perspective view of the housing of
  • Figure 4 is a schematic sectional view of a housing of
  • the spark plug 1 comprises an insulator 2, which is usually made of a ceramic material. Further, a housing 3 is provided, which is provided of a metal material. Reference numeral 8 denotes a center electrode and reference numeral 9 a ground electrode. FIG. 1 shows the spark plug in section in the axial direction X-X.
  • the spark plug 1 further includes a sealing surface 4, which is provided on the housing 3.
  • the sealing surface 4 is aligned perpendicular to the axial direction XX.
  • the sealing surface 4 is provided on a projection 30 of the housing 3.
  • An outer circumference 40 in the region of the projection 30 is greater 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 ready.
  • the sealing surface 4 has a multiplicity of recesses 5.
  • eight recesses 5 In this embodiment, eight
  • the recesses 5 have an arcuate shape and are open in the direction of the outer circumference 40 (compare FIGS. 3 and 4).
  • the recesses 5 may also have a wedge-shaped form, wherein the wedge-shaped recess 5 extends from the outer circumference 40 in the direction of the spark plug longitudinal axis. The tip of the wedge-shaped
  • the spark plug 1 comprises a sealing ring. 6
  • the sealing ring 6 rests against the sealing surface 4 in the mounted state.
  • 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 loosely placed on the sealing surface 4.
  • the recesses 5 with depth T are clearly visible.
  • Sealing ring 6 such that this partially or completely fills the recesses 5. Since the recesses 5 are designed to be open to the radial outside (see Figure 3), thus optionally also excess, plastically deformed material of the sealing ring 6 can flow to the outside.
  • a sum of all areas of the recesses 5 corresponds to approximately 50% of the total area of the sealing surface 4 directed surface of the sealing ring 6.
  • the recesses 5 are preferably produced by means of a forming process with a correspondingly shaped punch.
  • a surface of the sealing surface 4 and the recesses 5 is designed with a predetermined roughness.
  • a coefficient of friction can be further increased.
  • the coefficient of friction is at least 0.25.
  • a spark plug for relatively small threaded smaller internal combustion engines can be provided which can be fixed with increased tightening torque despite the smaller metric thread (e.g., M8 or M10).

Abstract

The invention relates to a spark plug comprising an insulator (2), a housing (3) with a sealing surface (4), and a sealing ring (6) that rests against the sealing surface (4), the sealing surface (4) being provided with a plurality of recesses (5).

Description

Beschreibung Titel  Description title
Zündkerze mit erhöhtem Anzugsdrehmoment Stand der Technik  Spark plug with increased tightening torque prior 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 with an increased tightening torque in a cylinder head or the like of an internal combustion engine.
Zündkerzen sind aus dem Stand der Technik in unterschiedlichen Spark plugs are different from the prior art
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 Embodiments known. Spark plugs are usually screwed by means of a thread into a threaded bore in a cylinder head. When screwing the spark plug into the cylinder head bore torques between 10 Nm to 30 Nm are usually applied. 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 occurs e.g. via an outer sealing ring on the housing, which is provided in section in a folded shape and is squeezed when screwing the spark plug. Due to the increasing demands in the field of internal combustion engines recently smaller engines with smaller cylinder heads and a more compact design are increasingly used. But you need smaller ones
Zündkerzen, welche von den Gewindegrößen M14 und M12 auf die Spark plugs, which of the thread sizes M14 and M12 on the
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. Offenbarung der Erfindung Thread sizes M10 and M8 go over. However, this can lead to a crack on the spark plug housing when screwing the spark plug into the cylinder head bore due to the smaller size of the thread to a plastic deformation of the thread. For a secure fixation of the spark plug, however, this must be introduced with a predetermined minimum torque in the cylinder head, otherwise leaks and accidental release of the spark plug could occur. Disclosure of the invention
Die erfindungsgemäße Zündkerze mit den Merkmalen des Anspruchs 1 weist demgegenüber den Vorteil auf, dass die Zündkerzen trotz reduzierten The spark plug according to the invention with the features of claim 1 has the advantage that the spark plugs despite reduced
Abmessungen mit hohen Anzugsdrehmomenten in einer Zylinderkopfbohrung eingebracht werden können. Hierbei treten keine Verformungen der Dimensions with high tightening torques can be introduced in a cylinder head bore. Here are no deformations of the
Gewindeverbindung zwischen Zündkerze und Zylinderkopf auf. Threaded connection between spark plug and cylinder head.
Erfindungsgemäß wird insbesondere ein vergrößerter Reibwert zwischen einem Dichtring und der Zündkerze einerseits und dem Dichtring und der According to the invention, in particular an increased coefficient of friction between a sealing ring and the spark plug on the one hand and the sealing ring and the
Zylinderkopfbohrung andererseits erreicht. Hierdurch kann eine erhöhte Cylinder head bore on the other hand achieved. This can be an increased
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.  Abdrehfestigkeit the spark plug can be achieved. This is inventively achieved in that the spark plug comprises an insulator, a housing having a sealing surface and a sealing ring. The sealing ring bears against the sealing surface of the housing and the sealing surface has a multiplicity of recesses. Due to the plurality of recesses on the sealing surface is achieved that plastically deformed when screwing the spark plug into the cylinder head bore of the sealing ring and partially and / or completely fills the recesses in the sealing surface. As a result, in particular, not only an improved frictional engagement between the sealing ring and the housing of the spark plug is achieved, but also a partial or complete positive connection on the sealing ring. As a result, increased friction coefficients can be achieved. Advantageously, the coefficient of friction is 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 Preferably, the recesses in the sealing surface to a
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. Outer circumference of the housing of the spark plug open. As a result, a simpler plastic deformation of the sealing ring during screwing in particular is made possible. Furthermore, if necessary, excess plastically deformed material of the sealing ring can emerge 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 circumferential projection of the housing. In this way, in particular a good seal between the spark plug and the cylinder head can be achieved.
Bevorzugt ist die Dichtfläche an einem senkrecht zur Axialrichtung der Zündkerze vorgesehenen Mantelbereich des Gehäuses angeordnet. Hierdurch wird auch ein äußerer Dichtring zur Fixierung und Abdichtung der Zündkerze an der The sealing surface is preferably arranged on a jacket region of the housing which is perpendicular to the axial direction of the spark plug. This is also a Outer sealing ring for fixing and sealing the spark plug to the
Zylinderkopfbohrung verwendet. Cylinder head bore used.
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 uniform intervals in the circumferential direction on the sealing surface. This ensures a uniform coefficient of friction along the circumference between the sealing ring and the housing.
Weiter bevorzugt ist eine Dicke des Dichtrings größer als eine Tiefe der More preferably, a thickness of the sealing ring is greater than a depth of the
Ausnehmungen in der Dichtfläche. Vorzugsweise ist die Dicke um einen Faktor in einem Bereich von 4 bis 6 größer als eine Tiefe der Ausnehmungen. Recesses in the sealing surface. Preferably, the thickness is greater by a factor in a range of 4 to 6 than a depth of the recesses.
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 housing of the spark plug. As a result, a large sealing surface area between the sealing ring and the housing of the spark plug can be made possible.
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. Preferably, a sudden transition is provided between the recesses and the sealing surface. As a result, particularly high coefficients of friction between the sealing ring and sealing surface can be achieved in the mounted state.
Vorzugsweise sind an der Dichtfläche eine gerade Zahl von Ausnehmungen, insbesondere zwischen 4 und 10 Ausnehmungen, vorgesehen. Preferably, an even number of recesses, in particular between 4 and 10 recesses, are provided on the sealing surface.
Ferner weist das Gehäuse vorzugsweise ein metrisches ISO-Gewinde M10 oder ein M8 gemäß DIN 13-1 , Ausgabe 1 1.1999, auf. Dadurch können die Furthermore, the housing preferably has a metric ISO thread M10 or M8 according to DIN 13-1, edition 1 1.1999, on. This allows the
Abmessungen des Gehäuses und somit der gesamten Zündkerze reduziert werden, so dass diese insbesondere für kleinbauende Motoren mit beengten Platzverhältnissen geeignet ist. Dimensions of the housing and thus the entire spark plug can be reduced, so that it is particularly suitable for small-sized engines with limited 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 1 1 .1999, vorgesehen ist Zeichnung Furthermore, the present invention relates to an internal combustion engine with a spark plug according to the invention, wherein between the spark plug and a cylinder head of the internal combustion engine, a metric M10 thread or a metric M8 thread according to DIN 13-1, Issue 1 1 .1999, is provided drawing
Nachfolgend wird ein bevorzugtes Ausführungsbeispiel der Erfindung unter Bezugnahme auf die begleitende Zeichnung im Detail beschrieben. In der Zeichnung ist: Hereinafter, a preferred embodiment of the invention will be described in detail with reference to the accompanying drawings. In the drawing is:
Figur 1 eine schematische, teilweise geschnittene Ansicht einer Figure 1 is a schematic, partially sectioned view of a
Zündkerze gemäß einem bevorzugten Ausführungsbeispiel der Erfindung,  Spark plug according to a preferred embodiment of the invention,
Figur 2 eine schematische Seitenansicht eines Gehäuses der Figure 2 is a schematic side view of a housing of
Zündkerze von Figur 1 mit eingelegtem Dichtring,  Spark plug of Figure 1 with inserted sealing ring,
Figur 3 eine schematische, perspektivische Ansicht des Gehäuses von Figure 3 is a schematic, perspective view of the housing of
Figur 2 ohne Dichtring, und  Figure 2 without sealing ring, and
Figur 4 eine schematische Schnittansicht eines Gehäuses der Figure 4 is a schematic sectional view of a housing of
Zündkerze von Figur 1.  Spark plug of Figure 1.
Bevorzugte Ausführungsform der Erfindung Preferred 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. Hereinafter, a spark plug 1 according to a first preferred embodiment of the invention will be described in detail with reference to FIGS.
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 comprises an insulator 2, which is usually made of a ceramic material. Further, a housing 3 is provided, which is provided of a metal material. Reference numeral 8 denotes a center electrode and reference numeral 9 a ground electrode. FIG. 1 shows the spark plug in section in the axial direction X-X.
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 further includes a sealing surface 4, which is provided on the housing 3. The sealing surface 4 is aligned perpendicular to the axial direction XX. The sealing surface 4 is provided on a projection 30 of the housing 3. An outer circumference 40 in the region of the projection 30 is greater 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 ready.
Wie insbesondere aus Figur 3 ersichtlich ist, weist die Dichtfläche 4 eine Vielzahl von Ausnehmungen 5 auf. In diesem Ausführungsbeispiel sind acht As can be seen in particular from FIG. 3, the sealing surface 4 has a multiplicity of recesses 5. In this embodiment, eight
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  Recesses 5 provided. The recesses 5 have an arcuate shape and are open in the direction of the outer circumference 40 (compare FIGS. 3 and 4). Alternatively, the recesses 5 may also have a wedge-shaped form, wherein the wedge-shaped recess 5 extends from the outer circumference 40 in the direction of the spark plug longitudinal axis. The tip of the wedge-shaped
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.  Recess 5 in the direction of spark plugs longitudinal axis and the base of the wedge-shaped recess 5 in the direction of the outer circumference 40, wherein the base of the wedge-shaped recess 5 in the direction of the outer periphery 40 is open.
Zwischen den Ausnehmungen 5 und der Dichtfläche 4 ist jeweils ein Between the recesses 5 and the sealing surface 4 is one each
sprunghafter Übergang 7 vorgesehen. Eine Grundfläche 50 der Ausnehmungensudden transition 7 is provided. A base 50 of the recesses
5 ist dabei parallel zur Fläche der Dichtflächen 4. Wie weiter aus Figur 1 ersichtlich ist, umfasst die Zündkerze 1 einen Dichtring 6.5 is parallel to the surface of the sealing surfaces 4. As further seen in Figure 1, the spark plug 1 comprises a sealing ring. 6
Der Dichtring 6 liegt im montierten Zustand an der Dichtfläche 4 an. Der DichtringThe sealing ring 6 rests against the sealing surface 4 in the mounted state. The sealing ring
6 weist einen rechteckigen Querschnitt, insbesondere einen quadratischen Querschnitt, auf. 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. 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.
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 Figure 2 shows the state of the spark plug, in which the sealing ring 6 is loosely placed on the sealing surface 4. Here, the recesses 5 with depth T are clearly visible. When screwing the spark plug 1 in a not shown
Zylinderkopfbohrung mit Innengewinde erfolgt nun, sobald der Dichtring 6 an einer Auflagefläche des Zylinderkopfs aufliegt, eine plastische Verformung desCylinder head bore with internal thread is now, as soon as the sealing ring 6 rests against a bearing surface of the cylinder head, a plastic deformation of the
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. Sealing ring 6 such that this partially or completely fills the recesses 5. Since the recesses 5 are designed to be open to the radial outside (see Figure 3), thus optionally also excess, plastically deformed material of the sealing ring 6 can flow 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 1 1.1999), 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 thus during the driving in addition to the frictional connection between the sealing surface 4 and the sealing ring 6 and a positive connection between the plastically deformed sealing ring 6 and the recesses 5 is achieved. As a result, a higher coefficient of friction between the sealing ring and the housing 3 is made possible. This results in a significantly increased turn-off resistance of the spark plug, thus the spark plug, even with a smaller thread diameter of the external thread 41, e.g. M8 or M10 (metric thread DIN 13-1, edition 1 1.1999), are fixed with a high tightening torque in the cylinder head, without causing damage to the threads or even a crack of 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 sealing surface 4 directed surface of the sealing ring 6.
Die Ausnehmungen 5 werden vorzugsweise mittels eines Umform Verfahrens mit einem entsprechend ausgeformten Stempel erzeugt. The recesses 5 are preferably produced by means of a forming process with a correspondingly shaped punch.
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. Advantageously, the coefficient of friction is 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 present invention, a spark plug for relatively small threaded smaller internal combustion engines can be provided which can be fixed with increased tightening torque despite the smaller metric thread (e.g., M8 or M10).

Claims

Ansprüche claims
1 . Zündkerze, umfassend: 1 . Spark plug, comprising:
einen Isolator (2),  an insulator (2),
ein Gehäuse (3) mit einer Dichtfläche (4), und  a housing (3) with a sealing surface (4), and
einen Dichtring (6), welcher an der Dichtfläche (4) anliegt, wobei die Dichtfläche (4) eine Vielzahl von Ausnehmungen (5) aufweist.  a sealing ring (6), which rests against the sealing surface (4), wherein the sealing surface (4) has a plurality of recesses (5).
2. Zündkerze nach Anspruch 1 , dadurch gekennzeichnet, dass die 2. Spark plug according to claim 1, characterized in that the
Ausnehmungen (5) zu einem Außenumfang (40) des Gehäuses (3) offen sind.  Recesses (5) to an outer periphery (40) of the housing (3) are open.
3. Zündkerze nach einem der vorhergehenden Ansprüche, dadurch 3. Spark plug according to one of the preceding claims, characterized
gekennzeichnet, dass die Dichtfläche (4) am Gehäuse (3) an einem umlaufenden Vorsprung (30) des Gehäuses vorgesehen sind.  in that the sealing surface (4) on the housing (3) are provided on a circumferential projection (30) of the housing.
4. Zündkerze nach einem der vorhergehenden Ansprüche, dadurch 4. Spark plug according to one of the preceding claims, characterized
gekennzeichnet, dass die Dichtfläche (4) an einem senkrecht zur  characterized in that the sealing surface (4) at a perpendicular to
Axialrichtung (X-X) der Zündkerze vorgesehenen Mantelbereich des Gehäuses (3) angeordnet ist.  Axial direction (X-X) of the spark plug provided jacket region of the housing (3) is arranged.
5. Zündkerze nach einem der vorhergehenden Ansprüche, dadurch 5. Spark plug according to one of the preceding claims, characterized
gekennzeichnet, dass die Ausnehmungen (5) in gleichmäßigen Abständen in Umfangsrichtung angeordnet sind.  characterized in that the recesses (5) are arranged at equal intervals in the circumferential direction.
Zündkerze nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine Dicke (D) des Dichtrings in Axialrichtung (X-X) der Zündkerze größer ist als eine Tiefe (T) der Ausnehmungen (5) in Axialrichtung (X-X) der Zündkerze. Spark plug according to one of the preceding claims, characterized in that a thickness (D) of the sealing ring in the axial direction (XX) of the spark plug is greater than a depth (T) of the recesses (5) in the axial direction (XX) of the spark plug.
7. Zündkerze nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein Außenumfang (40) der Dichtfläche dem größten Durchmesser des Gehäuses (3) entspricht. 7. Spark plug according to one of the preceding claims, characterized in that an outer circumference (40) of the sealing surface corresponds to the largest diameter of the housing (3).
8. Zündkerze nach einem der vorhergehenden Ansprüche, dadurch 8. Spark plug according to one of the preceding claims, characterized
gekennzeichnet, dass zwischen den Ausnehmungen (5) und der  characterized in that between the recesses (5) and the
Dichtfläche (3) ein sprunghafter Übergang (7) vorgesehen ist.  Sealing surface (3) a sudden transition (7) is provided.
9. Zündkerze nach einem der vorhergehenden Ansprüche, dadurch 9. Spark plug according to one of the preceding claims, characterized
gekennzeichnet, dass die Anzahl der Ausnehmungen eine gerade Zahl ist, insbesondere in einem Bereich von 4 bis 10 Ausnehmungen.  characterized in that the number of recesses is an even number, in particular in a range of 4 to 10 recesses.
10. Zündkerze nach einem der vorhergehenden Ansprüche, dadurch 10. Spark plug according to one of the preceding claims, characterized
gekennzeichnet, dass am Gehäuse (3) ein Außengewinde (41 ) als metrisches Gewinde M10 oder M8 vorgesehen ist.  in that an external thread (41) is provided on the housing (3) as a metric thread M10 or M8.
1 1 . Brennkraftmaschine, umfassend eine Zündkerze nach einem der 1 1. Internal combustion engine, comprising a spark plug according to one of
vorhergehenden Ansprüche, und eine metrische M8-Gewinde-Verbindung oder eine metrische M10-Gewinde-Verbindung zwischen Zündkerze und Zylinderkopf.  preceding claims, and an M8 metric thread connection or M10 metric 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 true EP3371861A1 (en) 2018-09-12
EP3371861B1 EP3371861B1 (en) 2022-09-07

Family

ID=57208262

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16787768.7A Active EP3371861B1 (en) 2015-11-02 2016-10-20 Spark plug having an increased tightening torque

Country Status (5)

Country Link
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

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JP2005129377A (en) * 2003-10-24 2005-05-19 Denso Corp 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

Also Published As

Publication number Publication date
EP3371861B1 (en) 2022-09-07
US10340665B2 (en) 2019-07-02
US20180323582A1 (en) 2018-11-08
ES2932559T3 (en) 2023-01-20
DE102015221394B4 (en) 2024-02-01
DE102015221394A1 (en) 2017-05-04
WO2017076650A1 (en) 2017-05-11

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