EP2845274B1 - Bougie d'allumage et procédé de fabrication d'une bougie d'allumage - Google Patents

Bougie d'allumage et procédé de fabrication d'une bougie d'allumage Download PDF

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Publication number
EP2845274B1
EP2845274B1 EP13713814.5A EP13713814A EP2845274B1 EP 2845274 B1 EP2845274 B1 EP 2845274B1 EP 13713814 A EP13713814 A EP 13713814A EP 2845274 B1 EP2845274 B1 EP 2845274B1
Authority
EP
European Patent Office
Prior art keywords
thread
sealing element
ignition plug
spark plug
combustion chamber
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
EP13713814.5A
Other languages
German (de)
English (en)
Other versions
EP2845274A1 (fr
Inventor
Thomas Buchberger
Bernd Mueller
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 EP2845274A1 publication Critical patent/EP2845274A1/fr
Application granted granted Critical
Publication of EP2845274B1 publication Critical patent/EP2845274B1/fr
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
    • H01T21/00—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs
    • H01T21/02—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs of sparking plugs

Definitions

  • the present invention relates to a method of manufacturing a spark plug and a spark plug.
  • spark plugs have a thread for screwing the spark plug in an internal combustion engine, in particular in the cylinder head on.
  • the manufacture of these spark plugs it is possible to position the thread or the thread start or the threaded end relative to the ground electrode.
  • the angular position of the ground electrode is defined in the combustion chamber.
  • a sealing washer is pushed over the finished thread on the spark plug housing. This sealing washer seals the spark plug against the cylinder head.
  • the gasket is usually caulked or crimped for a captive installation.
  • the thickness tolerance and the type of captive attachment of the sealing disc have a negative effect on the achievable positional orientation of the ground electrode.
  • the thickness of the sealing disc influences the angle of rotation up to the tight fit of the spark plug in the cylinder head, and thus also the angular position of the ground electrode in the combustion chamber.
  • a thread pitch of 1.25 mm causes a change in thickness of the sealing disc of 0.01 mm, a change in the rotation angle of about 3 °.
  • the EP 1 965 475 A1 discloses a manufacturing method of a spark plug as well as a spark plug according to the invention, which has a spark plug housing with a formed by forming thread and a sealing element, wherein the inner diameter of the sealing element is smaller than the nominal diameter of the thread.
  • the inventive method for producing a spark plug having the features of claim 1 enables the thickness tolerance of Sealing disk (in general: sealing element) no longer has to be taken into account in the positional orientation of the ground electrode.
  • Sealing disk in general: sealing element
  • the sealing element is mounted on the spark plug housing before the thread is made.
  • the position accuracy of the angular position of the ground electrode in the combustion chamber can be increased.
  • a captive attachment of the sealing element can be achieved by mounting the sealing element before forming the thread, without compressing or caulking the sealing element.
  • a sealing element is used whose inner diameter is smaller than the nominal diameter of the thread.
  • a method of manufacturing a spark plug comprising the following steps in a given order: (i) providing a spark plug housing with a cylindrical portion, (ii) fitting a sealing element onto the portion, and (iii) forming a thread the section by reshaping.
  • the inner diameter of the sealing element is chosen smaller than the nominal diameter of the thread.
  • the sealing element is a sealing washer.
  • the sealing disc is preferably not a molded sealing ring, but a massive sealing disc. In contrast to the molded sealing ring, the massive sealing disc has no cavities or undercuts in its cross section. Particularly in the case of the solid sealing disk, the method according to the invention for captive assembly is advantageously used.
  • an original diameter of the section before the formation of the thread is smaller than the diameter of the sealing element.
  • the portion adjacent to a combustion chamber facing end face of the spark plug housing is attached to the section before forming the thread up to this end face. Then, the thread is then formed on the section. As a result, the sealing element is fixed on one side by the end face and on the other side by the thread flanks and thus captive.
  • the combustion chamber facing side of the plugged sealing element is used as a reference point for the positioning of the thread.
  • a beginning or an end of the thread is positioned in a defined angular position to a ground electrode of the spark plug and with a defined distance to the combustion chamber facing side of the plugged sealing element.
  • the sealing element is now attached before the formation of the thread.
  • the combustion chamber facing side of the plugged sealing element serves as a reference point for the positioning of the thread, so that the thickness of the sealing element has no influence on the positional orientation of the thread or the ground electrode.
  • the thread is formed on the portion by cold forming.
  • a method for thread rolling is used here. Therefore, the portion on which the thread is formed may also be referred to as a rolling portion. Thread rolling is also referred to as thread rolling.
  • the production of the thread by a forming process results in that the nominal diameter of the thread is greater than the original diameter of the section.
  • the captive assembly of the sealing element is possible.
  • the sealing element is not mounted captive by further process steps. So there is no change in the inner diameter of the sealing element after plugging, for example by caulking.
  • the sealing element is not connected by cohesive connections, such as welding, with the housing. According to the invention it is sufficient that the inner diameter of the sealing element is smaller than the nominal diameter of the thread, so as to ensure a captive installation.
  • the invention further comprises a spark plug according to claim 7.
  • This spark plug comprises a spark plug housing having a combustion chamber facing end face and a thread for screwing the spark plug in an internal combustion engine. As described above, this thread is formed on the portion by a forming process. Furthermore, the spark plug includes a captive on the spark plug housing plugged sealing element between the thread and the end face. In this case, an inner diameter of the sealing element is smaller than a nominal diameter of the thread. Preferably, the inner diameter of the sealing element is fully formed the same extent, and thus not caulked. In addition, no cohesive connection between the sealing element and the spark plug housing is provided. The provided within the scope of the inventive advantageous embodiments and subclaims find correspondingly advantageous application to the spark plug according to the invention.
  • FIGS. 1 and 2 show an embodiment of the spark plug 1 according to the invention, prepared by the method according to the invention.
  • the spark plug 1 comprises a spark plug housing 2.
  • this spark plug housing 2 is an insulator 3.
  • a center electrode 4 is accommodated. This center electrode 4 is on the combustion chamber side beyond the insulator.
  • a bent ground electrode 5 is fixed.
  • a connection 6 for a cable is provided on the combustion chamber side facing away from the spark plug 1 .
  • the spark plug housing 2 has a cylindrical portion 7. On this section 7, a thread 8 is formed.
  • the section 7 is also called “rolling section", since the thread 8 has been produced by a forming process, namely "thread rolling".
  • a shoulder 9 is formed on the spark plug housing 2. At the shoulder 9, a combustion chamber facing end surface 10 is defined. This end face 10 thus limits the section 7.
  • the sealing element 11 is, as the sectional view in FIG. 1 shows a massive gasket.
  • the sealing element 11 is preferably made of metal.
  • the spark plug 1 is screwed in a cylinder head of an internal combustion engine.
  • the sealing element 11 seals the spark plug housing 2 relative to the cylinder head.
  • the ground electrode 5 and the center electrode 4 are located in the combustion chamber of the internal combustion engine. Between the center electrode 4 and the ground electrode 5, a spark gap is formed. A spark for igniting a gas in the combustion chamber is generated via this ignition gap.
  • the angular position of the ground electrode 5 within the combustion chamber is crucial for effective combustion.
  • the thread 8, in particular the beginning or the end of the thread 8 must be positioned exactly at the section 7. Since, according to the invention, the sealing element 11 is attached before the formation of the thread 8, a combustion chamber facing Side 16 of the sealing element 11 can be used as a reference point for the positioning of the thread 8.
  • a threaded recess can be provided in the region of the sealing seat.
  • the threaded recess is due to the production technology:
  • the combustion chamber facing end face 10 is produced by machining turning.
  • section 7 must also be machined at least slightly.
  • FIG. 2 shows a detail FIG. 1 , You can see a section of the sealing element 11 and the thread 8 in section.
  • the sealing element 11 has a consistently uniform inner diameter 12.
  • a nominal diameter 13 is defined. This nominal diameter 13 is the maximum outer diameter of the thread 8. For example, in the case of an M12 thread, the nominal diameter 13 is 12 mm.
  • a core diameter 15 is defined on the thread 8.
  • FIG. 2 also shows an original diameter 14 of the section 7. Before forming the thread 8, the section 7 had the original diameter 14. This original diameter 14 is smaller than the inner diameter 12 of the sealing element 11. Thus, before the formation of the thread 8, the sealing element 11 could without further be pushed over the section 7 to the plant on the end face 10. Only after the thread 8 was produced by thread rolling. In this forming process, the diameter increased in places up to the nominal diameter of 13. How FIG. 2 shows, the nominal diameter 13 of the thread 8 is greater than the inner diameter 12 of the sealing element 11, whereby the sealing element 11 is taken captive.
  • the diameters in FIG. 2 are perpendicular to the central axis 16 (s. Fig. 1 ) of the spark plug 1 defined.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Manufacturing & Machinery (AREA)
  • Spark Plugs (AREA)

Claims (8)

  1. Procédé de fabrication d'une bougie d'allumage (1), comprenant les étapes suivantes dans l'ordre indiqué :
    - fourniture d'un corps de bougie d'allumage (2) doté d'une portion cylindrique (7),
    - emmanchement d'un élément d'étanchéité (11) sur la portion (7), et
    - formation d'un filet (8) sur la portion (7) par façonnage, le côté face à la chambre de combustion (16) de l'élément d'étanchéité (11) emmanché étant utilisé comme point de référence pour le positionnement du filet (8),
    - un début et une fin du filet (8) étant positionnés dans une position angulaire définie par rapport à une électrode de masse (5) de la bougie d'allumage (1) et avec un écart défini par rapport au côté face à la chambre de combustion (16) de l'élément d'étanchéité (11) emmanché,
    - un diamètre intérieur (12) de l'élément d'étanchéité (11) étant inférieur à un diamètre nominal (13) du filet (8).
  2. Procédé selon la revendication 1, caractérisé en ce que l'élément d'étanchéité (11) est une rondelle d'étanchéité, de préférence une rondelle d'étanchéité massive.
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'un diamètre initial (14) de la portion (7) avant la formation du filet (8) est plus petit que le diamètre intérieur (12) de l'élément d'étanchéité (11).
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que la portion (7) est adjacente d'une surface frontale face à la chambre de combustion (10) du corps de bougie d'allumage (2), l'élément d'étanchéité (11) étant, emmanché sur la portion (7) jusqu'à la surface frontale (10) avant de former le filet (8).
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que le filet (8) est réalisé par façonnage à froid, de préférence par des galets de filetage.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que le diamètre intérieur (12) de l'élément d'étanchéité (11) n'est pas modifié après l'emmanchement, et l'élément d'étanchéité (11) n'est notamment pas maté.
  7. Bougie d'allumage (1), comprenant
    - un corps de bougie d'allumage (2) doté d'une surface frontale face à la chambre de combustion (10) et d'un filet (8) destiné à visser la bougie d'allumage (1) dans un moteur à combustion interne et
    - un élément d'étanchéité (11) emmanché de manière imperdable sur le corps de bougie d'allumage (2) entre le filet (8) et la surface frontale (10), le côté face à la chambre de combustion (16) de l'élément d'étanchéité (11) emmanché étant le point de référence pour le positionnement du filet (8), et un début et une fin du filet (8) étant positionnés dans une position angulaire définie par rapport à une électrode de masse (5) de la bougie d'allumage (1) et avec un écart défini par rapport au côté face à la chambre de combustion (16) de l'élément d'étanchéité (11) emmanché,
    - un diamètre intérieur (12) de l'élément d'étanchéité (11) étant inférieur à un diamètre nominal (13) du filet (8).
  8. Bougie d'allumage selon la revendication 7, caractérisée en ce que l'élément d'étanchéité (11) est une rondelle d'étanchéité, de préférence une rondelle d'étanchéité massive.
EP13713814.5A 2012-05-03 2013-03-22 Bougie d'allumage et procédé de fabrication d'une bougie d'allumage Active EP2845274B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012207319A DE102012207319A1 (de) 2012-05-03 2012-05-03 Zündkerze und Verfahren zum Herstellen einer Zündkerze
PCT/EP2013/056047 WO2013164130A1 (fr) 2012-05-03 2013-03-22 Bougie d'allumage et procédé de fabrication d'une bougie d'allumage

Publications (2)

Publication Number Publication Date
EP2845274A1 EP2845274A1 (fr) 2015-03-11
EP2845274B1 true EP2845274B1 (fr) 2018-10-17

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ID=48045466

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Application Number Title Priority Date Filing Date
EP13713814.5A Active EP2845274B1 (fr) 2012-05-03 2013-03-22 Bougie d'allumage et procédé de fabrication d'une bougie d'allumage

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EP (1) EP2845274B1 (fr)
DE (1) DE102012207319A1 (fr)
WO (1) WO2013164130A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9972978B2 (en) 2015-06-15 2018-05-15 Federal-Mogul Ignition Company Spark plug gasket and method of attaching the same
DE102015221394B4 (de) * 2015-11-02 2024-02-01 Robert Bosch Gmbh Zündkerze mit erhöhtem Anzugsdrehmoment und Brennkraftmaschine
DE102017109844B4 (de) 2017-05-08 2019-08-14 Federal-Mogul Ignition Gmbh Verfahren zum Herstellen einer Zündkerzenanordnung und Zündkerzenanordnung
DE102020209858A1 (de) 2020-08-05 2022-02-10 Robert Bosch Gesellschaft mit beschränkter Haftung Zündkerze mit Dichtscheibe und Dichtscheibe für eine Zündkerze
DE102020209834A1 (de) * 2020-08-05 2022-02-10 Robert Bosch Gesellschaft mit beschränkter Haftung Charge von Zündkerzen
DE102021207100A1 (de) 2021-07-06 2023-01-12 Robert Bosch Gesellschaft mit beschränkter Haftung Dichtscheibe sowie Zündkerze mit Dichtscheibe
DE102022121764B4 (de) 2022-08-29 2024-06-27 Volkswagen Aktiengesellschaft Verfahren zur Montage von Zündkerzen an einen Zylinderkopf eines Verbrennungsmotors

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2941105A (en) * 1952-08-02 1960-06-14 Avco Mfg Corp Gasket
JP2000215963A (ja) * 1999-01-25 2000-08-04 Ngk Spark Plug Co Ltd スパ―クプラグの製造設備及びスパ―クプラグの製造方法
JP4296202B2 (ja) * 2007-02-27 2009-07-15 日本特殊陶業株式会社 スパークプラグの製造方法およびその製造方法により製造されたスパークプラグ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2845274A1 (fr) 2015-03-11
DE102012207319A1 (de) 2013-11-07
WO2013164130A1 (fr) 2013-11-07

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