EP3771049B1 - 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
EP3771049B1
EP3771049B1 EP20198706.2A EP20198706A EP3771049B1 EP 3771049 B1 EP3771049 B1 EP 3771049B1 EP 20198706 A EP20198706 A EP 20198706A EP 3771049 B1 EP3771049 B1 EP 3771049B1
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EP
European Patent Office
Prior art keywords
housing
housing portion
spark plug
plug according
insulator
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
EP20198706.2A
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German (de)
English (en)
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EP3771049A1 (fr
Inventor
Steffen Kuhnert
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.)
DKT Verwaltungs GmbH
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DKT Verwaltungs GmbH
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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
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • H01T13/36—Sparking plugs characterised by features of the electrodes or insulation characterised by the joint between insulation and body, e.g. using cement
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/54—Sparking plugs having electrodes arranged in a partly-enclosed ignition chamber
    • 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 spark plug, in particular a prechamber spark plug, with a housing, a center electrode and a ground electrode. Furthermore, the present invention relates to a method for producing a spark plug.
  • Prechamber spark plugs of the type in question are well known from practice.
  • prechamber spark plugs are also known, which are used in particular for internal combustion engines that work on the principle of lean combustion.
  • Prechamber spark plugs have a prechamber that interacts with the combustion chamber of an internal combustion engine through transfer openings.
  • the fuel-air mixture is ignited by means of ignition sparks in the prechamber, after which the combustion continues in the form of ignition flares through the transfer openings into the combustion chamber of the combustion engine, where the lean mixture, which tends to be reluctant to ignite, is ignited.
  • a pre-chamber spark plug is, for example, from WO 03/071644 A1 previously known.
  • the well-known prechamber spark plug comprises a housing, an insulator with an internal center electrode, a prechamber in the front housing area with at least one overflow channel to the combustion chamber of an internal combustion engine, and a device for forming a spark gap.
  • the insulator is clamped in a two-part housing, with the housing parts being welded to one another around the circumference.
  • the insulator is held in the housing by the prestress that is generated by the residual stress or the shrinking process after welding.
  • a spark plug comprising a housing and an insulator with an internal center electrode is already known.
  • the housing is designed in one piece.
  • the insulator is inserted into the housing and the upper edge of the housing is flanged. Furthermore, a deformation area is formed on the housing.
  • the problem with this spark plug is that the beading of the upper edge of the one-piece housing means that the housing cannot be made solid in this area. As a result, the housing cannot be sufficiently resistant to pressure against the insulator and there is a risk of the insulator being pushed out of the housing in the event of a particularly high pressure load.
  • the present invention is therefore based on the object of designing and developing a spark plug in such a way that a stable and gas-tight spark plug is realized with structurally simple means. Furthermore, a manufacturing method for a spark plug is to be specified.
  • the housing is designed in two parts and has a deformation area that is used to brace the housing parts with the insulator. Due to the two-part design of the housing, it is possible to use the one facing away from the combustion chamber Design housing part particularly massive, so that the risk of the insulator being pushed out at high pressure loads is significantly reduced.
  • the deformation area it can be heated and the two housing parts can be pressed against one another, so that the deformation of the deformation area and after the cooling of the deformation area results in a tensioning of the insulator in the housing. This ensures that there is a constant preload around the circumference of the housing.
  • the deformation area can advantageously have a reduced cross-sectional area. This constructive measure makes it possible to process the deformation area in an extremely simple manner, namely to press the housing parts together in the heated state.
  • the insulator can be made of a ceramic, for example.
  • the first housing part and the second housing part can consist of different materials.
  • the materials can be steel, a nickel-based alloy, a copper-based alloy, etc., for example.
  • the coefficients of expansion of the insulator and the housing can be coordinated and the thermal conductivity can be increased in a targeted manner.
  • At least one ventilation opening can be formed on the first housing part and/or on the second housing part, in order in particular to discharge any leakage gases that may occur during manufacture (welding) or during operation.
  • the vent opening has the further advantage that if the sealing function fails, the pressure can be reduced via the vent opening before the insulator is pressed out of the housing.
  • the first housing part and the second housing part can be connected to one another via a weld seam.
  • the weld seam can be produced, for example, using tungsten inert gas welding and/or a plasma welding process and/or a laser welding process.
  • a housing extension in particular a tubular one, can advantageously be arranged on the housing.
  • the housing extension can be fixed to the housing, in particular the second housing part, via a welded connection.
  • the housing extension has a passage for an ignition cable and/or that an electrically insulating material is arranged between the housing extension and the ignition cable, in particular with a dielectric strength of more than 5 kV/mm.
  • the electrically insulating material can be a gel, for example, in particular a silicone gel. This can preferably be a pourable two-component mixture.
  • At least one ventilation opening can be formed on the housing extension in order to discharge leakage gases occurring during manufacture or during operation of the spark plug. This also serves as a safety element, since pressure can escape through the ventilation opening in the event of a failure of the sealing function of the spark plug before the insulator is pressed out of the housing.
  • a gripping element in particular a hexagon, for an assembly tool can be formed on the first housing part or on the housing extension. If the engagement means is realized on the first housing part, which faces the combustion chamber, the connection between the first and the second housing part is not stressed when the spark plug is screwed in, so that there is no risk of damage to the connection.
  • a particularly robust and gas-tight spark plug can be produced through the combination of a two-part housing and a deformation area.
  • the deformation area is heated in a targeted manner, preferably to a temperature of over 600° C., and the housing parts are then pressed together.
  • the heated deformation area is deformed and, after the deformation area has cooled down, the insulator is strained in the housing.
  • the deformation area can directly or indirectly bear against the insulator under prestress after the pressing.
  • the housing parts can advantageously be welded to one another, for example by means of a tungsten inert gas welding process or a plasma welding process or a laser welding process.
  • the deformation area is heated by means of inductive heating. This has the advantage that the deformation area can be heated in a targeted, annular and homogeneous manner.
  • spark plug In the 1 and 2 a first exemplary embodiment of a spark plug according to the invention is shown.
  • the spark plug is designed as a pre-chamber spark plug, it being expressly pointed out that the spark plug according to the invention does not necessarily have to be designed as a pre-chamber spark plug.
  • the spark plug comprises a housing 1 which partially encloses an insulator 2 .
  • the housing 1 has a first housing part 3 and a second housing part 4 .
  • the housing parts 3, 4 are connected to one another via a weld seam 5.
  • a supply line (not shown) runs inside the insulator 2, via which the central electrode 6 can be supplied with an electrical voltage.
  • the center electrode 6 is realized in the form of two strips, each with ends that are curved in an arc shape. The ends of the strips each act as an ignition surface.
  • the first housing part 3 serves as a ground electrode 7 in the illustrated embodiment.
  • the antechamber 8 is closed off by a cap 9, with transfer openings 10 in the cap 9 are formed, through which the ignition flares can extend into the combustion chamber.
  • the cap 9 is connected to the first housing part 3 via a weld seam 5'.
  • a deformation area 11 is provided on the second housing part 4 .
  • this area of the second housing part 4 is heated in a ring-shaped, homogeneous manner after the first housing part 3 and the second housing part 4 have been welded to one another.
  • the deformation area 11 has a corresponding temperature—preferably above 600° C.—the housing parts 3, 4 are pressed against one another with a force F, preferably along the arrows shown in the figures.
  • the deformation region 11 shrinks as a result of the cooling, so that the insulator 2 is strained in the housing 3, 4, as is shown in the figures.
  • the deformation area 11 rests directly or indirectly on the insulator 2 .
  • the deformation area 11 can also be realized exclusively on the first housing part 3 or that at least one deformation area 11 can be formed on each of the two housing parts 3, 4.
  • the end of the second housing part 4 facing away from the combustion chamber can be designed to be particularly solid and robust, which significantly minimizes the risk of the insulator 2 being pushed out of the housing 1, particularly in comparison to a one-piece housing that in is crimped in this area.
  • a connection means 12 for connecting the supply line to an ignition system is formed on the end of the insulator 2 facing away from the combustion chamber.
  • a ventilation opening 13 and an engagement means 14 are formed on the second housing part 4 .
  • the attack means 14 is implemented as a hexagon.
  • a sealing ring 15, for example made of steel or copper, is provided between the first housing part 3 and the insulator 2.
  • a thread 16 and a further sealing ring 17 are formed on the outer wall of the first housing part 3, which seals with the combustion chamber cover.
  • FIG. 3 and 4 a further exemplary embodiment of a spark plug according to the invention is shown.
  • This essentially corresponds to the exemplary embodiment according to FIG 1 and 2 ,
  • a housing extension 18 being connected to the first housing part 3 via a weld seam 19 .
  • An ignition line 20 runs inside the housing extension 18 .
  • the area between the ignition line 20 and the tubular housing extension 18 is filled with an electrically insulating material 21 , for example a silicone gel, and sealed with a sealing ring 22 .
  • a passage 23 for the ignition line 20 is formed on the end of the housing extension 18 facing away from the combustion chamber.
  • a means of engagement 14 for a tool and a ventilation opening 13 are formed on the housing extension 18 .
  • the engagement means 14 can be a hexagon, for example, so that the spark plug can be screwed into the ignition chamber with a tool that fits it.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Spark Plugs (AREA)

Claims (13)

  1. Bougie d'allumage de pré-chambre, avec un boîtier (1), une électrode centrale (6) et une électrode de masse (7), dans laquelle l'électrode centrale (6) peut être alimentée en tension électrique par l'intermédiaire d'une conduite d'alimentation s'étendant au moins partiellement dans un isolateur (2) et dans laquelle le boîtier (1) est constitué d'une première partie de boîtier (3) et d'une deuxième partie de boîtier (4) et loge en lui au moins une partie de l'isolateur (2), caractérisée en ce que la première partie de boîtier (3), orientée vers une chambre de combustion, comprend une zone de déformation (11), afin de serrer l'isolateur (2) à l'intérieur de la première partie de boîtier (3) et de la deuxième partie de boîtier (4)
  2. Bougie d'allumage selon la revendication 1, caractérisée en ce que la zone de déformation (11) présente une surface de section transversale réduite.
  3. Bougie d'allumage selon la revendication 1 ou 2, caractérisée en ce que la première partie de boîtier (3) et la deuxième partie de boîtier (4) sont constituées de matériaux différents.
  4. Bougie d'allumage selon l'une des revendications 1 à 3, caractérisée en ce que, sur la première partie de boîtier (3) et/ou sur la deuxième partie de boîtier (4), est réalisée au moins une ouverture de ventilation (13).
  5. Bougie d'allumage selon l'une des revendications 1 à 4, caractérisée en ce que la première partie de boîtier (3) et/ou la deuxième partie de boîtier (4) sont reliées entre elles par l'intermédiaire d'un cordon de soudure (5).
  6. Bougie d'allumage selon l'une des revendications 1 à 5, caractérisée en ce que, sur le boîtier (3, 4) est disposé un prolongement de boîtier tubulaire (18).
  7. Bougie d'allumage selon la revendication 6, caractérisée en ce que le prolongement de boîtier (18) est soudé avec le boîtier (3, 4).
  8. Bougie d'allumage selon la revendication 6 ou 7, caractérisée en ce que le prolongement de boîtier (18) comprend un passage (23) pour une conduite d'allumage (20).
  9. Bougie d'allumage selon l'une des revendications 6 à 8, caractérisée en ce que, sur le prolongement de boîtier (18) est réalisée au moins une ouverture de ventilation (13).
  10. Bougie d'allumage selon l'une des revendications 1 à 9, caractérisée en ce que, sur la première partie de boîtier (3) ou sur le prolongement de boîtier (18) est réalisé un moyen d'engagement (14), plus particulièrement un six-pans, pour un outil de montage.
  11. Procédé de fabrication d'une bougie d'allumage de pré-chambre selon l'une des revendications 1 à 10, avec les étapes suivantes :
    - disposition d'au moins une zone d'un isolateur (2) dans une première partie de boîtier (3) et une deuxième partie de boîtier (4),
    - liaison de la première partie de boîtier (3) avec la deuxième partie de boîtier (4),
    - chauffage d'une zone de déformation (11) de la première partie de boîtier (3), orientée vers une chambre de combustion, de préférence à plus de 600°C et compression de la première partie de boîtier (3), orientée vers une chambre de combustion, et de la deuxième partie de boîtier (4) l'une contre l'autre, de façon à ce que l'isolateur (2) soit serré à l'intérieur de la première partie de boîtier (3) et de la deuxième partie de boîtier (4).
  12. Procédé selon la revendication 11, caractérisé en ce que les parties de boîtier (3, 4) sont soudées entre elles, par exemple au moyen d'un procédé de soudure à électrode de tungstène et à gaz inerte ou d'un procédé de soudure au plasma ou d'un procédé de soudure au laser.
  13. Procédé selon la revendication 11 ou 12, caractérisé en ce que la zone de déformation (11) est chauffée au moyen d'un chauffage inductif.
EP20198706.2A 2017-02-13 2017-12-08 Bougie d'allumage et procédé de fabrication d'une bougie d'allumage Active EP3771049B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102017202238.8A DE102017202238B3 (de) 2017-02-13 2017-02-13 Zündkerze und ein Verfahren zur Herstellung einer Zündkerze
EP17832910.8A EP3406009B1 (fr) 2017-02-13 2017-12-08 Bougie d'allumage et procédé de fabrication d'une bougie d'allumage
PCT/DE2017/200132 WO2018145679A1 (fr) 2017-02-13 2017-12-08 Bougie d'allumage et procédé de fabrication d'une bougie d'allumage

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP17832910.8A Division EP3406009B1 (fr) 2017-02-13 2017-12-08 Bougie d'allumage et procédé de fabrication d'une bougie d'allumage

Publications (2)

Publication Number Publication Date
EP3771049A1 EP3771049A1 (fr) 2021-01-27
EP3771049B1 true EP3771049B1 (fr) 2022-06-22

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EP17832910.8A Active EP3406009B1 (fr) 2017-02-13 2017-12-08 Bougie d'allumage et procédé de fabrication d'une bougie d'allumage
EP20198706.2A Active EP3771049B1 (fr) 2017-02-13 2017-12-08 Bougie d'allumage et procédé de fabrication d'une bougie d'allumage

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Application Number Title Priority Date Filing Date
EP17832910.8A Active EP3406009B1 (fr) 2017-02-13 2017-12-08 Bougie d'allumage et procédé de fabrication d'une bougie d'allumage

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EP (2) EP3406009B1 (fr)
DE (1) DE102017202238B3 (fr)
WO (1) WO2018145679A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018206784A1 (de) * 2018-05-03 2019-11-07 Robert Bosch Gmbh Vorkammer-Zündkerze
JP7494617B2 (ja) 2020-07-22 2024-06-04 株式会社デンソー 内燃機関用のスパークプラグ及びその製造方法
JP7468257B2 (ja) 2020-09-02 2024-04-16 株式会社デンソー 内燃機関用のスパークプラグ及びこれを備えた内燃機関
DE102021203101A1 (de) * 2021-03-29 2022-09-29 Dkt Verwaltungs-Gmbh Zündkerze und ein Verfahren zur Herstellung einer Zündkerze
US11569640B2 (en) 2021-06-23 2023-01-31 Caterpillar Inc. Spark plug

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE889386C (de) * 1948-12-04 1953-09-10 Gen Motors Corp Zuendkerze fuer Verbrennungskraftmaschinen
US2863080A (en) * 1955-04-15 1958-12-02 Gen Motors Corp Spark plug and method for making same
ATE330348T1 (de) * 2002-02-22 2006-07-15 Dieter Dr Kuhnert Vorkammerzündkerze und verfahren zur herstellung derselben
DE50300292D1 (de) * 2002-07-22 2005-03-10 Jenbacher Ag Jenbach Zündkerze
CN101517850B (zh) * 2006-08-03 2012-08-01 费德罗-莫格尔公司 整片外壳的高螺纹火花塞
DE102006043593B3 (de) * 2006-09-16 2008-04-10 Multitorch Gmbh Zündkerze
US8030831B1 (en) * 2010-04-01 2011-10-04 Fram Group Ip Llc High thread spark plug with undercut insulator
JP2017004882A (ja) * 2015-06-15 2017-01-05 富士重工業株式会社 点火プラグ

Also Published As

Publication number Publication date
EP3771049A1 (fr) 2021-01-27
WO2018145679A1 (fr) 2018-08-16
EP3406009B1 (fr) 2020-10-28
DE102017202238B3 (de) 2018-02-08
EP3406009A1 (fr) 2018-11-28

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