EP3371861B1 - Bougie d'allumage à couple de serrage augmenté - Google Patents

Bougie d'allumage à couple de serrage augmenté Download PDF

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Publication number
EP3371861B1
EP3371861B1 EP16787768.7A EP16787768A EP3371861B1 EP 3371861 B1 EP3371861 B1 EP 3371861B1 EP 16787768 A EP16787768 A EP 16787768A EP 3371861 B1 EP3371861 B1 EP 3371861B1
Authority
EP
European Patent Office
Prior art keywords
spark plug
recesses
housing
sealing surface
sealing ring
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
EP16787768.7A
Other languages
German (de)
English (en)
Other versions
EP3371861A1 (fr
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/fr
Application granted granted Critical
Publication of EP3371861B1 publication Critical patent/EP3371861B1/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
    • 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 in a cylinder head or the like of an internal combustion engine with an increased tightening torque.
  • Spark plugs are known from the prior art in different configurations. Spark plugs are usually screwed into a threaded bore in a cylinder head by means of a thread. Torques between 10 Nm and 30 Nm are usually applied when screwing the spark plug into the cylinder head bore.
  • 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 takes place, for example, via an outer sealing ring on the housing, which is provided in a folded form in section and is squeezed when the spark plug is screwed in. Due to the increasing requirements in the field of internal combustion engines, smaller engines with smaller cylinder heads and a more compact design have recently been increasingly used.
  • spark plugs are known from JP S55 78758 U , the DE 10 2012 207319 A1 and the CH 222 618 A .
  • JP S55 78758 U discloses a spark plug according to the preamble of claim 1.
  • the spark plug according to the invention with the features of claim 1 has the advantage that the spark plugs can be introduced into a cylinder head bore with high tightening torques despite reduced dimensions. There is no deformation of the threaded connection between the spark plug and the cylinder head. According to the invention, in particular an increased coefficient of friction is achieved between a sealing ring and the spark plug on the one hand and the sealing ring and the cylinder head bore on the other. This allows the spark plug to be more resistant to twisting. According to the invention, this is achieved in that the spark plug comprises an insulator, a housing with a sealing surface and a sealing ring. The sealing ring rests against the sealing surface of the housing and the sealing surface has a large number of recesses.
  • the multiplicity of recesses on the sealing surface means that when the spark plug is screwed into the cylinder head bore, the sealing ring is plastically deformed and partially and/or completely fills the recesses in the sealing surface. In this way, not only is an improved frictional connection between the sealing ring and the housing of the spark plug achieved, but also a partial or complete positive connection on the sealing ring. As a result, increased coefficients of friction can be achieved.
  • the coefficient of friction is advantageously at least 0.25.
  • the recesses in the sealing surface are preferably open to an outer circumference of the housing of the spark plug. In this way, in particular, a simpler plastic deformation of the sealing ring is made possible during screwing. Furthermore, if necessary, excess plastically deformed material of the sealing ring can escape on the open side of the recess.
  • the sealing surface is provided on a peripheral 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 arranged on a casing area of the housing provided perpendicular to the axial direction of the spark plug.
  • an outer sealing ring is also used for fixing and sealing the spark plug on the cylinder head bore.
  • the recesses are arranged at regular intervals in the circumferential direction on the sealing surface. This ensures an even 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 recesses in the sealing surface.
  • the thickness is greater than a depth of the recesses by a factor in a range of 4 to 6.
  • an outer circumference of the sealing surface corresponds to the largest diameter of the spark plug housing. This allows a large sealing surface area between the sealing ring and the housing of the spark plug.
  • a sudden transition is preferably provided between the recesses and the sealing surface. As a result, particularly high coefficients of friction between the sealing ring and the sealing surface can be achieved in the assembled state.
  • An even number of recesses in particular between 4 and 10 recesses, are preferably provided on the sealing surface.
  • the housing has a metric ISO thread M10 or an M8 according to DIN 13-1, issue 11.1999.
  • the dimensions of the housing and thus of the entire spark plug can be reduced, so that it is particularly suitable for small engines with restricted space.
  • the present invention relates to an internal combustion engine with a spark plug according to the invention, a metric M10 thread or a metric M8 thread according to DIN 13-1, issue 11.1999, being provided between the spark plug and a cylinder head of the internal combustion engine.
  • the spark plug 1 includes an insulator 2, which is usually made of a ceramic material. Furthermore, a housing 3 is provided, which is provided from a metal material. Numeral 8 denotes a center electrode, and numeral 9 denotes a ground electrode. the figure 1 shows the spark plug in section in the axial direction XX.
  • the spark plug 1 also includes a sealing surface 4 which is provided on the housing 3 .
  • the sealing surface 4 is perpendicular to the axial direction XX aligned.
  • the sealing surface 4 is provided on a projection 30 of the housing 3 .
  • An outer circumference 40 in the area of the projection 30 is larger 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 .
  • the sealing surface 4 has a large number of recesses 5 .
  • eight recesses 5 are provided.
  • the recesses 5 have an arcuate shape and are open in the direction of the outer circumference 40 (cf. figure 3 and 4 ).
  • the recesses 5 can also be wedge-shaped, with the wedge-shaped recess 5 extending from the outer circumference 40 in the direction of the longitudinal axis of the spark plug.
  • the tip of the wedge-shaped recess 5 is arranged in the direction of the longitudinal axis of the spark plug and the base of the wedge-shaped recess 5 is arranged in the direction of the outer circumference 40 , the base of the wedge-shaped recess 5 being open in the direction of the outer circumference 40 .
  • a sudden transition 7 is provided between the recesses 5 and the sealing surface 4 in each case.
  • a base surface 50 of the recesses 5 is parallel to the surface of the sealing surfaces 4.
  • the spark plug 1 includes a sealing ring 6.
  • the sealing ring 6 bears against the sealing surface 4 in the installed state.
  • the sealing ring 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.
  • 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 placed loosely on the sealing surface 4.
  • the recesses 5 with depth T are clearly visible.
  • screwing the spark plug 1 into a not-shown cylinder head bore with an internal thread now takes place as soon as the sealing ring 6 on rests on a bearing surface of the cylinder head, a plastic deformation of the sealing ring 6 in such a way that it partially or completely fills the recesses 5 .
  • the recesses 5 are designed to be open to the radial outside (cf. figure 3 ), Excess, plastically deformed material of the sealing ring 6 can therefore also flow out to the outside.
  • a positive connection between the plastically deformed sealing ring 6 and the recesses 5 is thus achieved during the screwing-in process in addition to the non-positive connection between the sealing surface 4 and the sealing ring 6 .
  • This also enables a higher coefficient of friction between the sealing ring and the housing 3 .
  • a sum of all areas of the recesses 5 corresponds to approximately 50% of the total area of the area of the sealing ring 6 directed towards the sealing area 4 .
  • the recesses 5 are preferably produced by means of a forming process with a correspondingly shaped stamp.
  • 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.
  • the coefficient of friction is advantageously at least 0.25.
  • a spark plug for smaller internal combustion engines with a relatively small thread can be provided which, despite the smaller metric thread (e.g. M8 or M10), can be fixed with an increased tightening torque.
  • the smaller metric thread e.g. M8 or M10

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Claims (8)

  1. Bougie d'allumage, comprenant :
    - un isolateur (2),
    - un boîtier (3) avec une surface d'étanchéité (4), et
    - une bague d'étanchéité extérieure (6), qui s'applique sur la surface d'étanchéité (4) et qui est conçue pour fixer et étanchéifier la bougie d'allumage sur un alésage de culasse, la surface d'étanchéité (4) étant agencée sur une zone d'enveloppe du boîtier (3) prévue perpendiculairement à la direction axiale (X-X) de la bougie d'allumage,
    - la surface d'étanchéité (4) présentant une pluralité d'évidements (5),
    - caractérisée en ce qu'une épaisseur (D) de la bague d'étanchéité dans la direction axiale (X-X) de la bougie d'allumage est supérieure à une profondeur (T) des évidements (5) dans la direction axiale (X-X) de la bougie d'allumage, et en ce qu'un filetage extérieur est prévu sur le boîtier sous forme de filetage métrique M10 ou M8.
  2. Bougie d'allumage selon la revendication 1, caractérisée en ce que les évidements (5) sont ouverts vers une circonférence extérieure (40) du boîtier (3).
  3. Bougie d'allumage selon l'une quelconque des revendications précédentes, caractérisée en ce que la surface d'étanchéité (4) sur le boîtier (3) est prévue sur une saillie périphérique (30) du boîtier.
  4. Bougie d'allumage selon l'une quelconque des revendications précédentes, caractérisée en ce que les évidements (5) sont agencés à intervalles réguliers dans la direction circonférentielle.
  5. Bougie d'allumage selon l'une quelconque des revendications précédentes, caractérisée en ce qu'une circonférence extérieure (40) de la surface d'étanchéité correspond au diamètre maximal du boîtier (3) .
  6. Bougie d'allumage selon l'une quelconque des revendications précédentes, caractérisée en ce qu'une transition brusque (7) est prévue entre les évidements (5) et la surface d'étanchéité (3).
  7. Bougie d'allumage selon l'une quelconque des revendications précédentes, caractérisée en ce que le nombre d'évidements est un nombre pair, en particulier dans une plage allant de 4 à 10 évidements.
  8. Moteur à combustion interne, comprenant une bougie d'allumage selon l'une quelconque des revendications précédentes, et un raccord fileté métrique M8 ou un raccord fileté métrique M10 entre la bougie d'allumage et la culasse.
EP16787768.7A 2015-11-02 2016-10-20 Bougie d'allumage à couple de serrage augmenté Active EP3371861B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015221394.3A DE102015221394B4 (de) 2015-11-02 2015-11-02 Zündkerze mit erhöhtem Anzugsdrehmoment und Brennkraftmaschine
PCT/EP2016/075168 WO2017076650A1 (fr) 2015-11-02 2016-10-20 Bougie d'allumage à couple de serrage augmenté

Publications (2)

Publication Number Publication Date
EP3371861A1 EP3371861A1 (fr) 2018-09-12
EP3371861B1 true EP3371861B1 (fr) 2022-09-07

Family

ID=57208262

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16787768.7A Active EP3371861B1 (fr) 2015-11-02 2016-10-20 Bougie d'allumage à couple de serrage augmenté

Country Status (5)

Country Link
US (1) US10340665B2 (fr)
EP (1) EP3371861B1 (fr)
DE (1) DE102015221394B4 (fr)
ES (1) ES2932559T3 (fr)
WO (1) WO2017076650A1 (fr)

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 (de) * 2020-08-05 2022-02-10 Robert Bosch Gesellschaft mit beschränkter Haftung Zündkerze mit Dichtscheibe und Dichtscheibe für eine Zündkerze
DE102021205445A1 (de) * 2021-05-28 2022-12-01 Robert Bosch Gesellschaft mit beschränkter Haftung Werkzeug zur Entfernung eines Dichtrings von einer Zündkerze

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1526617A2 (fr) * 2003-10-24 2005-04-27 Denso Corporation Bougie d'allumage

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH222618A (de) * 1940-09-09 1942-07-31 Bosch Gmbh Robert Zündkerze.
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 (fr) 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 (de) 1995-12-08 2007-02-15 Volkswagen Ag Rohrstutzen oder dergleichen mit einem eine Dichtfläche aufweisenden Flansch
US5937813A (en) 1998-04-29 1999-08-17 Shifflette; J. Michael Resettable pressure relieving spark plug
DE102010003574B4 (de) 2010-03-31 2012-02-09 Schwäbische Hüttenwerke Automotive GmbH Pressverbund und Verfahren zur Herstellung eines Pressverbunds
CN201973041U (zh) * 2011-01-19 2011-09-14 深圳创维数字技术股份有限公司 安装用固定螺钉
DE102012207319A1 (de) * 2012-05-03 2013-11-07 Robert Bosch Gmbh Zündkerze und Verfahren zum Herstellen einer Zündkerze

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1526617A2 (fr) * 2003-10-24 2005-04-27 Denso Corporation Bougie d'allumage

Also Published As

Publication number Publication date
EP3371861A1 (fr) 2018-09-12
DE102015221394B4 (de) 2024-02-01
DE102015221394A1 (de) 2017-05-04
ES2932559T3 (es) 2023-01-20
US20180323582A1 (en) 2018-11-08
WO2017076650A1 (fr) 2017-05-11
US10340665B2 (en) 2019-07-02

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