EP3371861A1 - Bougie d'allumage à couple de serrage augmenté - Google Patents

Bougie d'allumage à couple de serrage augmenté

Info

Publication number
EP3371861A1
EP3371861A1 EP16787768.7A EP16787768A EP3371861A1 EP 3371861 A1 EP3371861 A1 EP 3371861A1 EP 16787768 A EP16787768 A EP 16787768A EP 3371861 A1 EP3371861 A1 EP 3371861A1
Authority
EP
European Patent Office
Prior art keywords
spark plug
recesses
housing
sealing surface
plug according
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
Application number
EP16787768.7A
Other languages
German (de)
English (en)
Other versions
EP3371861B1 (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

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
    • 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 with an increased tightening torque in a cylinder head or the like of an internal combustion engine.
  • Spark plugs are usually screwed by means of a thread into a threaded bore in a cylinder head.
  • torques between 10 Nm to 30 Nm are usually applied.
  • 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 occurs e.g. via an outer sealing ring on the housing, which is provided in section in a folded shape and is squeezed when screwing the spark plug.
  • Thread sizes M10 and M8 go over. However, this can lead to a crack on the spark plug housing when screwing the spark plug into the cylinder head bore due to the smaller size of the thread to a plastic deformation of the thread. For a secure fixation of the spark plug, however, this must be introduced with a predetermined minimum torque in the cylinder head, otherwise leaks and accidental release of the spark plug could occur. Disclosure of the invention
  • the spark plug according to the invention with the features of claim 1 has the advantage that the spark plugs despite reduced
  • Cylinder head bore on the other hand achieved. This can be an increased
  • the spark plug can be achieved.
  • the spark plug comprises an insulator, a housing having a sealing surface and a sealing ring.
  • the sealing ring bears against the sealing surface of the housing and the sealing surface has a multiplicity of recesses. Due to the plurality of recesses on the sealing surface is achieved that plastically deformed when screwing the spark plug into the cylinder head bore of the sealing ring and partially and / or completely fills the recesses in the sealing surface.
  • the coefficient of friction is at least 0.25.
  • the recesses in the sealing surface to a
  • the sealing surface is provided on a circumferential 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 preferably arranged on a jacket region of the housing which is perpendicular to the axial direction of the spark plug. This is also a Outer sealing ring for fixing and sealing the spark plug to the
  • the recesses are arranged at uniform intervals in the circumferential direction on the sealing surface. This ensures a uniform 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
  • the thickness is greater by a factor in a range of 4 to 6 than a depth of the recesses.
  • an outer circumference of the sealing surface corresponds to the largest diameter of the housing of the spark plug.
  • a sudden transition is provided between the recesses and the sealing surface.
  • particularly high coefficients of friction between the sealing ring and sealing surface can be achieved in the mounted state.
  • an even number of recesses in particular between 4 and 10 recesses, are provided on the sealing surface.
  • the housing preferably has a metric ISO thread M10 or M8 according to DIN 13-1, edition 1 1.1999, on. This allows the
  • the present invention relates to an internal combustion engine with a spark plug according to the invention, wherein between the spark plug and a cylinder head of the internal combustion engine, a metric M10 thread or a metric M8 thread according to DIN 13-1, Issue 1 1 .1999, is provided drawing
  • Figure 1 is a schematic, partially sectioned view of a
  • Figure 2 is a schematic side view of a housing of
  • Figure 3 is a schematic, perspective view of the housing of
  • Figure 4 is a schematic sectional view of a housing of
  • the spark plug 1 comprises an insulator 2, which is usually made of a ceramic material. Further, a housing 3 is provided, which is provided of a metal material. Reference numeral 8 denotes a center electrode and reference numeral 9 a ground electrode. FIG. 1 shows the spark plug in section in the axial direction X-X.
  • the spark plug 1 further includes a sealing surface 4, which is provided on the housing 3.
  • the sealing surface 4 is aligned perpendicular to the axial direction XX.
  • the sealing surface 4 is provided on a projection 30 of the housing 3.
  • An outer circumference 40 in the region of the projection 30 is greater 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 ready.
  • the sealing surface 4 has a multiplicity of recesses 5.
  • eight recesses 5 In this embodiment, eight
  • the recesses 5 have an arcuate shape and are open in the direction of the outer circumference 40 (compare FIGS. 3 and 4).
  • the recesses 5 may also have a wedge-shaped form, wherein the wedge-shaped recess 5 extends from the outer circumference 40 in the direction of the spark plug longitudinal axis. The tip of the wedge-shaped
  • the spark plug 1 comprises a sealing ring. 6
  • the sealing ring 6 rests against the sealing surface 4 in the mounted state.
  • 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 loosely placed on the sealing surface 4.
  • the recesses 5 with depth T are clearly visible.
  • Sealing ring 6 such that this partially or completely fills the recesses 5. Since the recesses 5 are designed to be open to the radial outside (see Figure 3), thus optionally also excess, plastically deformed material of the sealing ring 6 can flow to the outside.
  • a sum of all areas of the recesses 5 corresponds to approximately 50% of the total area of the sealing surface 4 directed surface of the sealing ring 6.
  • the recesses 5 are preferably produced by means of a forming process with a correspondingly shaped punch.
  • a surface of the sealing surface 4 and the recesses 5 is designed with a predetermined roughness.
  • a coefficient of friction can be further increased.
  • the coefficient of friction is at least 0.25.
  • a spark plug for relatively small threaded smaller internal combustion engines can be provided which can be fixed with increased tightening torque despite 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)

Abstract

L'invention concerne une bougie d'allumage comprenant un isolateur (2), un culot (3) pourvu d'une surface d'étanchéité (4) et une bague d'étanchéité (6) reposant sur la surface d'étanchéité (4), ladite surface d'étanchéité (4) comportant une pluralité d'évidements (5).
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 true EP3371861A1 (fr) 2018-09-12
EP3371861B1 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

Family Cites Families (11)

* 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
JP2005129377A (ja) * 2003-10-24 2005-05-19 Denso Corp スパークプラグ
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

Also Published As

Publication number Publication date
DE102015221394B4 (de) 2024-02-01
DE102015221394A1 (de) 2017-05-04
ES2932559T3 (es) 2023-01-20
EP3371861B1 (fr) 2022-09-07
US20180323582A1 (en) 2018-11-08
WO2017076650A1 (fr) 2017-05-11
US10340665B2 (en) 2019-07-02

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