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WO2018145679A1 - 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
WO2018145679A1
WO2018145679A1 PCT/DE2017/200132 DE2017200132W WO2018145679A1 WO 2018145679 A1 WO2018145679 A1 WO 2018145679A1 DE 2017200132 W DE2017200132 W DE 2017200132W WO 2018145679 A1 WO2018145679 A1 WO 2018145679A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
housing part
spark plug
insulator
plug according
Prior art date
Application number
PCT/DE2017/200132
Other languages
German (de)
English (en)
Inventor
Steffen Kuhnert
Original Assignee
Dkt Verwaltungs-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 Dkt Verwaltungs-Gmbh filed Critical Dkt Verwaltungs-Gmbh
Priority to EP20198706.2A priority Critical patent/EP3771049B1/fr
Priority to EP17832910.8A priority patent/EP3406009B1/fr
Publication of WO2018145679A1 publication Critical patent/WO2018145679A1/fr

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
    • H01T13/20—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, comprising a housing, a center electrode and a ground electrode. Furthermore, the present invention relates to a method for producing a spark plug. Spark plugs of the type in question are well known in practice. In particular, pre-chamber spark plugs are known, which are used in particular for internal combustion engines, which operate on the principle of lean burn. Prechamber spark plugs have an antechamber which interacts with the combustion chamber of an internal combustion engine through transfer openings.
  • a pre-chamber spark plug is previously known, for example, from WO 03/071644 A1.
  • the known pre-chamber spark plug comprises a housing, an insulator with internal center electrode, an antechamber 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, wherein the housing parts are welded together at the periphery.
  • the insulator is held by the bias in the housing, which is generated by the internal stress or the shrinkage process after welding.
  • the local, selective heat input during welding leads to a circumferentially inhomogeneous bias in the housing and on the sealing surfaces. Therefore, leakages often occur with corresponding spark plugs, which must be avoided.
  • a spark plug comprising a housing and an insulator with internal center electrode is previously known.
  • the housing is formed in one piece. To produce the spark plug, the insulator is inserted into the housing and the upper edge of the housing is crimped. Furthermore, a deformation area is formed on the housing.
  • the present invention is therefore based on the object to design a spark plug in such a way and further that with a structurally simple means a stable and gas-tight spark plug is realized. Furthermore, a production method for a spark plug is to be specified.
  • a spark plug in particular a Vorschzündkerze, indicated with a housing, a center electrode and a ground electrode, wherein the center electrode is acted upon via an at least partially extending in an insulator supply line with electrical voltage and wherein the housing consists of a first housing part and a second housing part and accommodates at least a part of the insulator in itself and wherein the first housing part and / or the second housing part have a deformation region for clamping the insulator within the first housing part and the second housing part.
  • the housing is formed in two parts and has a deformation region which serves to clamp the housing parts with the insulator. Due to the two-part design of the housing, it is possible that facing away from the combustion chamber Housing particularly massive design, so that the risk of squeezing out of the insulator is significantly reduced at high pressure loads.
  • the latter can be heated and the two housing parts can be pressed against each other, so that a distortion of the insulator in the housing is established by the deformation of the deformation area and after the cooling of the deformation area. This ensures that there is a constant preload around the circumference of the housing.
  • the deformation region can have a reduced cross-sectional area.
  • the insulator may for example be made of a ceramic.
  • the first housing part and the second housing part may consist of different materials.
  • the materials may be, for example, steel, a nickel-based alloy, a copper-based alloy, etc.
  • At least one venting opening can be formed on the first housing part and / or on the second housing part.
  • the vent has the further advantage that in case of failure of the sealing function, the pressure on the vent is degraded before it comes to a squeezing of the insulator from the housing.
  • the first housing part and the second housing part may be connected to each other via a weld.
  • the weld can be produced for example by tungsten inert gas welding and / or a plasma welding process and / or a laser welding process.
  • a, in particular tubular, housing extension can 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 line and / or that an electrically insulating material is arranged between the housing extension and the ignition line, in particular with a dielectric strength of more than 5 kV / mm.
  • the electrically insulating material may be for example a gel, in particular a silicone gel. This may preferably be a pourable two-component mixture.
  • At least one vent opening can be formed on the housing extension. This also serves as a security element, since in the event of failure of the sealing function of the spark plug pressure can escape through the vent opening, before it comes to a squeezing of the insulator from the housing.
  • a simplifiedsmitteil in particular a hexagon.
  • the connection between the first and the second housing part is not loaded when screwing the spark plug, so that there is no risk of damage to the connection.
  • first housing part Connecting the first housing part with the second housing part, heating a deformation region of the first housing part and / or the second housing part, preferably to above 600 ° C, and pressing the first housing part and the second housing part against each other.
  • a particularly robust and gas-tight spark plug can be produced by the combination of a two-part housing and a deformation area.
  • the deformation area is specifically heated, preferably to a temperature of over 600 ° C., and the housing parts are then pressed together.
  • the heated deformation region deforms and, after the deformation region has cooled, sets a tension of the insulator in the housing.
  • the deformation region after pressing can rest directly or indirectly under prestress on the insulator.
  • the housing parts can be welded together, for example by means of a tungsten inert gas welding process or a plasma welding process or a laser welding process.
  • the deformation region is heated by means of inductive heating. This has the advantage that the deformation region can be selectively heated annularly and homogeneously.
  • Fig. 1 in a schematic, partially sectional view of a first embodiment of a spark plug according to the invention
  • FIG. 2 is a schematic side view of the spark plug of FIG. 1,
  • Fig. 3 is a schematic, sectional view of a second
  • FIG. 4 is a schematic representation of an enlarged detail from FIG. 4.
  • a first embodiment of a spark plug according to the invention is shown.
  • the spark plug is designed as Vorschündkerze, it being expressly noted that the spark plug according to the invention does not necessarily have to be designed as Vorhuntzündkerze.
  • the spark plug comprises a housing 1, which encloses a part of 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 each other via a weld 5.
  • Within the insulator 2 extends a supply line, not shown, via which the center electrode 6 can be acted upon by electrical voltage.
  • the center electrode 6 is realized in the illustrated embodiment in the form of two strips, each with arcuately curved ends. The ends of the strips act as a firing surface.
  • the first housing part 3 is used in the illustrated embodiment as a ground electrode 7.
  • the pre-chamber 8 is completed by a cap 9, wherein in the cap 9 transfer openings 10th are formed, through which the Zündfackeln can extend into the Brennraunn.
  • the cap 9 is connected via a weld 5 'to the first housing part 3.
  • a deformation region 1 1 is provided on the second housing part 4. To produce the deformation region 1 1, this region of the second housing part 4 is annularly, homogeneously heated, after the first housing part 3 and the second housing part 4 have been welded together.
  • the deformation region 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. As a result of the cooling, the deformation region 1 1 shrinks, so that a tension of the insulator 2 in the housing 3, 4 sets, as shown in the figures. In particular, it is conceivable that the deformation region 1 1 rests directly or indirectly on the insulator 2. It is expressly pointed out that the deformation region 11 may also be realized exclusively on the first housing part 3 or that at least one deformation region 11 may be formed on both housing parts 3, 4.
  • the end facing away from the combustion chamber of the second housing part 4 may be particularly solid and robust, whereby the risk of squeezing out of the insulator 2 from the housing 1 is significantly minimized, especially in comparison to a one-piece housing that in this area is flanged.
  • a connecting means 12 for connecting the supply line to an ignition system is formed at the end of the insulator 2 facing away from the combustion chamber.
  • a vent opening 13 and an engagement means 14 are formed on the second housing part 4.
  • the attacking means 14 is realized 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.
  • FIGS. 3 and 4 show a further exemplary embodiment of a spark plug according to the invention. This corresponds essentially to the exemplary embodiment according to FIGS. 1 and 2, wherein a housing extension 18 is connected to the first housing part 3 via a weld seam 19. Within the housing extension 18 extends an ignition line 20. The area between the ignition line 20 and the tubular housing extension 18 is filled with an electrically insulating material 21, such as a silicone gel, and sealed with a sealing ring 22. At the end of the housing extension 18 facing away from the combustion chamber, a passage 23 for the ignition line 20 is formed. Furthermore, an engagement means 14 for a tool and a vent opening 13 are formed on the housing extension 18.
  • the attacking means 14 may be, for example, a hexagon, so that the spark plug can be screwed into the ignition space with a matching tool.

Landscapes

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

Abstract

L'invention concerne une bougie d'allumage, en particulier une bougie d'allumage à préchambre, composée d'un culot (1), d'une électrode centrale (6) et d'une électrode de masse (7), l'électrode centrale (6) pouvant être soumise à une tension électrique par l'intermédiaire d'une ligne d'alimentation qui s'étend au moins en partie dans un isolateur (2), le culot (1) étant constitué d'une première partie de culot (3) et d'une seconde partie de culot (4) et recevant en son sein au moins une partie de l'isolateur (2), et la première partie de culot (3) et/ou la seconde partie de culot (4) présentant une zone de déformation (11) permettant le maintien de l'isolateur (2) à l'intérieur de la première partie (3) et de la seconde partie (4) du culot. L'invention concerne en outre un procédé de fabrication d'une bougie d'allumage.
PCT/DE2017/200132 2017-02-13 2017-12-08 Bougie d'allumage et procédé de fabrication d'une bougie d'allumage WO2018145679A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20198706.2A EP3771049B1 (fr) 2017-02-13 2017-12-08 Bougie d'allumage et procédé de fabrication d'une bougie d'allumage
EP17832910.8A EP3406009B1 (fr) 2017-02-13 2017-12-08 Bougie d'allumage et procédé de fabrication d'une bougie d'allumage

Applications Claiming Priority (2)

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
DE102017202238.8 2017-02-13

Publications (1)

Publication Number Publication Date
WO2018145679A1 true WO2018145679A1 (fr) 2018-08-16

Family

ID=60996744

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2017/200132 WO2018145679A1 (fr) 2017-02-13 2017-12-08 Bougie d'allumage et procédé de fabrication d'une bougie d'allumage

Country Status (3)

Country Link
EP (2) EP3771049B1 (fr)
DE (1) DE102017202238B3 (fr)
WO (1) WO2018145679A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4068536A1 (fr) * 2021-03-29 2022-10-05 DKT Verwaltungs-GmbH Bougie d'allumage de chambre de précombustion et procédé de fabrication d'une bougie d'allumage de chambre de précombustion
US11791612B2 (en) 2021-06-23 2023-10-17 Caterpillar Inc. Spark plug

Families Citing this family (3)

* 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

Citations (5)

* 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
WO2003071644A1 (fr) 2002-02-22 2003-08-28 Dieter Kuhnert Bougie d'allumage d'une pre-chambre et son procede de production
WO2008017069A2 (fr) 2006-08-03 2008-02-07 Federal-Mogul Corporation Bougie d'allumage à pluralité de filets et à coque en une pièce
US8030831B1 (en) * 2010-04-01 2011-10-04 Fram Group Ip Llc High thread spark plug with undercut insulator

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE288632T1 (de) * 2002-07-22 2005-02-15 Jenbacher Ag Zündkerze
DE102006043593B3 (de) * 2006-09-16 2008-04-10 Multitorch Gmbh Zündkerze
JP2017004882A (ja) * 2015-06-15 2017-01-05 富士重工業株式会社 点火プラグ

Patent Citations (5)

* 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
WO2003071644A1 (fr) 2002-02-22 2003-08-28 Dieter Kuhnert Bougie d'allumage d'une pre-chambre et son procede de production
WO2008017069A2 (fr) 2006-08-03 2008-02-07 Federal-Mogul Corporation Bougie d'allumage à pluralité de filets et à coque en une pièce
US8030831B1 (en) * 2010-04-01 2011-10-04 Fram Group Ip Llc High thread spark plug with undercut insulator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4068536A1 (fr) * 2021-03-29 2022-10-05 DKT Verwaltungs-GmbH Bougie d'allumage de chambre de précombustion et procédé de fabrication d'une bougie d'allumage de chambre de précombustion
US11791612B2 (en) 2021-06-23 2023-10-17 Caterpillar Inc. Spark plug

Also Published As

Publication number Publication date
EP3771049A1 (fr) 2021-01-27
EP3406009A1 (fr) 2018-11-28
EP3406009B1 (fr) 2020-10-28
EP3771049B1 (fr) 2022-06-22
DE102017202238B3 (de) 2018-02-08

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