EP2845274A1 - Zündkerze und verfahren zum herstellen einer zündkerze - Google Patents
Zündkerze und verfahren zum herstellen einer zündkerzeInfo
- Publication number
- EP2845274A1 EP2845274A1 EP13713814.5A EP13713814A EP2845274A1 EP 2845274 A1 EP2845274 A1 EP 2845274A1 EP 13713814 A EP13713814 A EP 13713814A EP 2845274 A1 EP2845274 A1 EP 2845274A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- thread
- sealing element
- spark plug
- section
- sealing
- 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
Links
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 thread or the thread start or the threaded end In 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. As a result, the angular position of the ground electrode is defined in the combustion chamber. Such a positional orientation of the ground electrode is used in particular in modern internal combustion engines with direct injection.
- 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. Namely, 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 cylinder head
- Combustion chamber For example, with 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 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 captive assembly of the sealing element is given without a further manufacturing step.
- 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.
- 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 sealing element can be easily pushed over the section.
- the section adjoins a combustion chamber facing
- the sealing element is attached to the section before forming the thread up to this end face. Then, the thread is then formed on the section. That's it
- Sealing element fixed on one side by the end face and on the other side by the thread flanks and thus captive.
- combustion chamber facing side of the plugged sealing element is used as a reference point for the positioning of the thread.
- Particularly preferred is a beginning or an end of
- Thread in a defined angular position to a ground electrode of the spark plug and positioned at 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.
- 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. As a result, the captive mounting 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. Furthermore, 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 includes a spark plug.
- This spark plug comprises a spark plug housing with a combustion chamber-facing end face and a thread for screwing the spark plug into an internal combustion engine. As described above, this thread is on the section by a
- the spark plug includes a captive on the spark plug housing plugged sealing element between the thread and the end face.
- a captive on the spark plug housing plugged sealing element between the thread and the end face is an inner diameter of the
- Sealing element smaller a nominal diameter of the thread.
- the inner diameter of the sealing element is fully formed the same extent, and thus not caulked.
- no cohesive connection between the sealing element and the spark plug housing is provided.
- FIG. 1 shows a spark plug according to the invention according to a
- Embodiment, and Figure 2 shows a detail of the spark plug according to the invention according to the
- 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.
- In the insulator 3 is a
- This center electrode 4 was added. This center electrode 4 is on the combustion chamber side beyond the insulator. On the spark plug housing 2 is a curved
- Ground electrode 5 attached.
- connection 6 for a cable On the combustion chamber side facing away from the spark plug 1 is a connection 6 for a cable.
- the spark plug housing 2 has a cylindrical portion 7. On this section 7, a thread 8 is formed. Section 7 is also called
- a shoulder 9 is formed on the spark plug housing 2.
- a shoulder 9 is formed on the spark plug housing 2.
- combustion chamber facing end face 10 defined. This end face 10 thus limits the section 7.
- the sealing element 1 1 was pushed over the section 7 to the end face 10.
- the sealing element 1 1 is preferably made of metal.
- the spark plug 1 is screwed in a cylinder head of an internal combustion engine.
- the sealing element 1 1 thereby seals the spark plug 1
- Spark plug housing 2 opposite the cylinder head from.
- 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 1 1 before the
- a combustion chamber facing Side 16 of the sealing element 1 1 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 at least something to be machined.
- FIG. 2 shows a detailed detail from FIG. 1. To see a section of the sealing element 1 1 and the thread 8 in section.
- the sealing element 1 1 has a consistently uniform inner diameter 12. At the thread 8, a nominal diameter 13 is defined. This
- Nominal diameter 13 is the maximum outer diameter of the thread 8.
- 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 section 7.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Manufacturing & Machinery (AREA)
- Spark Plugs (AREA)
Abstract
Description
Claims
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 (de) | 2012-05-03 | 2013-03-22 | Zündkerze und verfahren zum herstellen einer zündkerze |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2845274A1 true EP2845274A1 (de) | 2015-03-11 |
| EP2845274B1 EP2845274B1 (de) | 2018-10-17 |
Family
ID=48045466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13713814.5A Active EP2845274B1 (de) | 2012-05-03 | 2013-03-22 | Zündkerze und verfahren zum herstellen einer zündkerze |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2845274B1 (de) |
| DE (1) | DE102012207319A1 (de) |
| WO (1) | WO2013164130A1 (de) |
Families Citing this family (8)
| 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 |
| DE102020209834A1 (de) * | 2020-08-05 | 2022-02-10 | Robert Bosch Gesellschaft mit beschränkter Haftung | Charge von Zündkerzen |
| DE102020209858A1 (de) | 2020-08-05 | 2022-02-10 | Robert Bosch Gesellschaft mit beschränkter Haftung | Zündkerze mit Dichtscheibe und Dichtscheibe für eine Zündkerze |
| 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 |
| DE102024210900A1 (de) | 2024-11-13 | 2026-05-13 | Robert Bosch Gesellschaft mit beschränkter Haftung | Zündkerzen-Gehäuse mit verliersicherer angeordneten Außendichtung sowie Zündkerze damit und Verfahren zur Montage der Außendichtung am Gehäuse |
Family Cites Families (3)
| 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 |
-
2012
- 2012-05-03 DE DE102012207319A patent/DE102012207319A1/de not_active Withdrawn
-
2013
- 2013-03-22 WO PCT/EP2013/056047 patent/WO2013164130A1/de not_active Ceased
- 2013-03-22 EP EP13713814.5A patent/EP2845274B1/de active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2013164130A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2845274B1 (de) | 2018-10-17 |
| DE102012207319A1 (de) | 2013-11-07 |
| WO2013164130A1 (de) | 2013-11-07 |
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