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EP2050171B1 - Bougie d'allumage a espace de montage reduit - Google Patents

Bougie d'allumage a espace de montage reduit Download PDF

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Publication number
EP2050171B1
EP2050171B1 EP07787701A EP07787701A EP2050171B1 EP 2050171 B1 EP2050171 B1 EP 2050171B1 EP 07787701 A EP07787701 A EP 07787701A EP 07787701 A EP07787701 A EP 07787701A EP 2050171 B1 EP2050171 B1 EP 2050171B1
Authority
EP
European Patent Office
Prior art keywords
spark plug
tool engagement
region
side end
tool
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.)
Ceased
Application number
EP07787701A
Other languages
German (de)
English (en)
Other versions
EP2050171A1 (fr
Inventor
Hermann Kersting
Thomas Kaiser
Dirk Scholz
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 EP2050171A1 publication Critical patent/EP2050171A1/fr
Application granted granted Critical
Publication of EP2050171B1 publication Critical patent/EP2050171B1/fr
Ceased 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
    • H01T13/20—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
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • 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
    • H01T13/34—Sparking plugs characterised by features of the electrodes or insulation characterised by the mounting of electrodes in insulation, e.g. by embedding

Definitions

  • the present invention relates to a spark plug for an internal combustion engine according to the preamble of patent claim 1.
  • Spark plugs for internal combustion engines are known from the prior art in different configurations.
  • a spark plug is known, which has a tubular, metallic housing with a screw-in thread impressed thereon.
  • at least a part of the metallic housing is provided with a galvanic coating as protection.
  • the available space for a spark plug becomes increasingly smaller.
  • Modern engines have multiple valves, usually between four and five valves per cylinder. In order to obtain a better filling and thus improved performance, in particular larger intake valve diameters are desirable. Furthermore, the higher power densities require larger cooling channels. In direct fuel injection engines, additional space is required for at least one injector.
  • the space available per cylinder for a spark plug is getting smaller.
  • the spark plug since the spark plug as a wearing part has to be replaced after a certain number of hours of use, it must be arranged interchangeably on the cylinder.
  • the spark plug according to the invention with the features of claim 1 has the advantage that its diameter can be significantly reduced in comparison with the conventional spark plugs. Thereby, the entire spark plug can be made slimmer and in particular the necessary space for the spark plug can be reduced. Furthermore, it is possible according to the invention to reduce a space previously required in the prior art for a tool for mounting or dismounting the spark plug. Thus, the total space required for the spark plug space, comprising the space for the spark plug and for a tool, especially in the direction of the combustion chamber end of the spark plug is reduced. This makes it possible to enable a significantly improved arrangement of the spark plug on a cylinder head.
  • a tool engagement region on which a tool for assembling or disassembling the spark plug engages is disposed on a region of the spark plug which lies between a connection-side end of the spark plug and a first sealing region between an insulator and a housing, starting from the connection end to the combustion chamber end of the spark plug.
  • first sealing area which is closer to the connection-side end
  • second sealing area which is closer to the combustion chamber.
  • the condition caused by the spark plug maximum outer diameter of the housing of the spark plug is greater than or equal to a diameter of a tool engagement region.
  • a diameter of about 16 mm can be used for the housing of the spark plug and for the tool engagement area a significantly reduced diameter.
  • the tool engagement region is preferably arranged on the housing, wherein the housing in the direction of the connection side Spark plug end is extended beyond the second sealing region and the tool engagement region is arranged on this extension.
  • the tool engagement region is preferably formed as a hexagon. This can be done with a standard tool and a wrench or similar. a change of the spark plug can be made. Particularly preferably, the hexagon has a key width of 12 or 13.
  • the tool engagement region comprises a sleeve region with a tool engagement means.
  • the tool engagement means is preferably a groove or a bore.
  • the tool engagement region is arranged on an electrical connection means of the spark plug.
  • the electrical connection means lies at the connection-side end of the spark plug and thus has a dual function, namely the provision of the electrical connection as well as a function as a tool engagement region. As a result, it is possible to dispense with the formation of a separate component with a tool engagement region.
  • the tool engagement region on the electrical connection means is preferably formed on a connection bolt of the spark plug.
  • the tool engagement region is formed on an end face of the connecting bolt directed towards the end of the spark plug.
  • the tool engagement region may be, for example, a recess for engagement with a screwdriver or Allen key, or an asymmetrically arranged bore for engagement with a special tool. It is also conceivable that at the end of the connecting bolt a hexagon o. ⁇ . is provided.
  • the tool engagement region can also have a Torx geometry, for example, which has the advantage of better manufacturability compared to a hexagon socket.
  • the tool engagement means may also be provided laterally on the electrical connection means.
  • the tool engagement means is particularly preferably designed as a groove or bore.
  • the present invention is applicable to all types of spark plugs, particularly conventional spark plugs with electrodes or laser spark plugs.
  • spark plugs particularly conventional spark plugs with electrodes or laser spark plugs.
  • FIG. 1 a spark plug 1 according to a first embodiment of the present invention described.
  • the spark plug 1 includes an insulator 2 and a housing 3 made of metal.
  • the electrode portion of the spark plug includes electrodes 9a and 9b disposed on the combustion chamber side end 10 of the spark plug 1.
  • the combustion chamber side End of the electrode is defined by the ground electrode.
  • the spark plug 1 further comprises a housing 3 which is made of a metal, and on which a thread 4 is provided integrally for screwing into a correspondingly formed thread in an engine component.
  • a middle housing section 5 of the housing 3 has, in a known manner, an upsetting and warming stocking zone 5a.
  • a tool engagement area 6 is integrally formed on the housing 3.
  • the spark plug 1 further comprises a connecting bolt 7, which is arranged in a known manner in the interior of the insulator 2 and is connected, for example via an electrically conductive glass melt and in some cases a contact pin with the center electrode 9a.
  • the spark plug 1 thus comprises a combustion-chamber-side end 10 in the region of the electrodes 9a, 9b and a connection-side end 11 in the region of a connection-side end element 8.
  • the end element 8 can be, for example, a connection nut screwed onto a thread of the connection bolt 7 or alternatively designed as a plug-in element , which is formed integrally with the connecting bolt 7.
  • an ignition cable is then fastened in a known manner.
  • a first sealing area 20 and a second sealing area 21 are further provided. How out FIG. 1 it can be seen, the housing encloses the insulator 2, wherein the first sealing region 20 is arranged closer to the connection-side end 11 of the spark plug and the second sealing region 21 is arranged closer to the combustion chamber.
  • the tool-engaging portion 6 is arranged at the connection-side end of the housing 3.
  • the housing 3 is extended over the first sealing region 20 in the direction of the connection-side end 11.
  • the tool engagement region 6 is thus arranged in a region L1 between the first sealing region 20 and the connection-side end 11 of the spark plug 1.
  • L is the total length of the spark plug. This makes it possible that the housing 3 no longer has to have a maximum diameter for a tool for mounting / dismounting the spark plug 1, but it may have a maximum diameter D1 corresponding to the functional requirements of the spark plug, in particular thickness of the insulation.
  • the maximum diameter of the tool-engaging portion can be significantly reduced, in particular on key widths 12 or 13 at thread M14 and insulator head diameter of 10.5 mm. This reduces the outer diameter of the tool and thus the required radial space requirement in the engine component.
  • the tool attack area of the combustion chamber end 10 is relatively far away. In the engine only enough space must be available radially to this area to accommodate the tool for mounting and dismounting the spark plug. In the area between the tool engagement area and the outer sealing point 22, the installation space required for the spark plug in the engine is predetermined only by the diameter of this sealing point 22.
  • the tool engagement region 6 is shown with a significantly reduced diameter D2.
  • the diameter D2 corresponds in particular to a diameter of a tool with a key width 12 or 13.
  • the tool engagement region 6 is formed integrally with the housing 3 in this embodiment. It should be noted, however, that the tool-engaging portion 6 can be prefabricated as a separate part and can be connected to the housing 3 with the housing 3, for example by welding or soldering or gluing or caulking with the housing 3.
  • FIG. 1 it can be seen, no additional space for a tool, which is necessary for mounting / demounting of the spark plug 1 at a combustion chamber side region L2 of the spark plug in the immediate vicinity of the spark plug.
  • the necessary space for a tool that is placed in the axial direction XX of the spark plug must be provided only in the vicinity of the tool attack area 6 and thus lies exclusively in the area L1 between the first sealing portion 20 and the connection-side end 11 of the spark plug 1.
  • the tool engagement region 6 is arranged in a connection-side half of the spark plug.
  • FIGS. 2a and 2b a spark plug 1 according to a second embodiment of the invention described in detail. Identical or functionally identical parts are denoted by the same reference numerals as in the first embodiment.
  • the spark plug 1 of the second exemplary embodiment has an alternatively formed tool engagement region 6.
  • the tool-engaging portion 6 is formed by a sleeve-like portion 12 which is integrally formed with the housing 3.
  • the sleeve-like region 12 is arranged in the direction of the combustion chamber end 11 again after the first sealing region 20.
  • a bore 13 is formed, which serves for receiving a correspondingly designed mounting tool (not shown).
  • the annular sleeve portion 12 can be provided particularly simple and inexpensive.
  • the outer diameter of the tool is smaller than the maximum outer diameter of the plug housing. In the engine then no additional space for the tool is necessary. Otherwise, this embodiment corresponds to the first embodiment, so that reference may be made to the description given there.
  • FIGS. 3a and 3b a spark plug 1 according to a third embodiment of the invention described. Identical or functionally identical parts are again denoted by the same reference numerals as in the first embodiment.
  • the third embodiment substantially corresponds to the second embodiment, wherein in the third embodiment, a radial groove 14 is formed on an annular sleeve portion 12, which is integrally formed with the housing 3. Like the bore 13 of the second embodiment, the radial groove 14 of the third embodiment is used to transmit a torque applied to a complementarily shaped tool (not shown) to the spark plug 1. Otherwise, this embodiment corresponds to the previous embodiments, so that reference is made to the description given there can.
  • FIG. 4 a spark plug according to a fourth embodiment of the invention described. Identical or functionally identical parts are designated by the same reference numerals as in the preceding embodiments.
  • the spark plug of the fourth embodiment has a tool engaging portion 6 which is disposed directly on the terminal side end 11 of the spark plug.
  • the connecting bolt 7 in this case has a connection-side end element 8, which is formed integrally with the connecting bolt 7. Alternatively, the connecting bolt could also be screwed on or caulked.
  • a groove 15 is provided, via which a torque can be transmitted to the spark plug 1 by means of a suitably designed tool.
  • the groove 15 extends over the entire diameter of the connection-side end of the end element 8.
  • a tool corresponding to the groove 15 may be, for example, a normal slot screwdriver.
  • the tool engaging portion 6 is disposed at the terminal end 11 of the spark plug.
  • a space required for the spark plug along the entire circumference of the spark plug, in particular for a tool for changing the spark plug can be saved.
  • a particularly slim and only a small outer diameter having spark plug can be provided.
  • FIGS. 5a and 5b a spark plug according to a fifth embodiment of the invention described, wherein identical or functionally identical parts are denoted by the same reference numerals as in the preceding embodiments.
  • the fifth embodiment substantially corresponds to the fourth embodiment, wherein in the fifth embodiment, a tool-engaging portion 6 is arranged laterally on a terminal-side end member 8 of the spark plug. More specifically, the tool-engaging portion 6 is formed with a lateral groove 16 on a support surface 8 a of the end member 8. The end element 8 is again formed in one piece with the connecting bolt 7. A torque is also applied to the spark plug again with a complementary to the lateral groove 16 and formed in the end member 8 tool. Otherwise, this embodiment corresponds to the previous embodiments, so that reference can be made to the description given there.
  • connection-side end element 8 comprises a radially projecting support surface 8a, with which the end element bears against the insulation 2 of the spark plug 1.

Landscapes

  • Spark Plugs (AREA)

Abstract

La présente invention concerne une bougie d'allumage pour un moteur à combustion interne, comprenant un moyen (8) de raccordement électrique à une extrémité (11) côté raccordement, une extrémité (10) côté chambre de combustion dirigée vers une chambre de combustion, un isolateur (2) et un boîtier (3) comprenant un filet (4) pour fixer la bougie d'allumage à un composant de moteur. Selon l'invention, une première zone (20) d'étanchéité et une deuxième zone (21) d'étanchéité sont formées entre l'isolateur (2) et le boîtier (3), la première zone (20) d'étanchéité est disposée plus proche de l'extrémité (11) côté raccordement et la deuxième zone (21) d'étanchéité est disposée plus près de l'extrémité (10) côté chambre de combustion. Toujours selon l'invention, une zone (6) de prise d'outil destinée à transmettre un couple à la bougie d'allumage en vue de monter ou de démonter la bougie d'allumage se trouve dans une zone (L1) de la bougie d'allumage qui est située entre l'extrémité (11) côté raccordement et la première zone (20) d'étanchéité.

Claims (11)

  1. Bougie d'allumage pour un moteur à combustion interne, comprenant un moyen de raccordement électrique (8) à une extrémité (11) du côté du raccordement, une extrémité (10) du côté de la chambre de combustion, orientée vers une chambre de combustion, un isolant (2) et un boîtier (3) avec un filetage (4) pour la fixation de la bougie d'allumage à un composant de moteur, une première région d'étanchéité (20) et une deuxième région d'étanchéité (21) étant formées entre l'isolant (2) et le boîtier (3), la première région d'étanchéité (20) étant disposée plus près de l'extrémité (11) du côté du raccordement et la deuxième région d'étanchéité (21) étant disposée plus près de l'extrémité (10) du côté de la chambre de combustion, caractérisée en ce qu'une région d'engagement d'outil (6) pour le transfert d'un couple à la bougie d'allumage pour monter ou démonter la bougie d'allumage est disposée sur une région (L1) de la bougie d'allumage, laquelle se situe entre l'extrémité (11) du côté du raccordement et la première région d'étanchéité (20).
  2. Bougie d'allumage selon la revendication 1, caractérisée en ce qu'un diamètre maximal (D1) du boîtier (3) est supérieur ou égal à un diamètre maximal (D2) de la région d'engagement d'outil (6).
  3. Bougie d'allumage selon l'une quelconque des revendications précédentes, caractérisée en ce que la région d'engagement d'outil (6) est réalisée sous forme polygonale, en particulier hexagonale, notamment avec une largeur de clé de 12 ou 13.
  4. Bougie d'allumage selon l'une quelconque des revendications 1 ou 2, caractérisée en ce que la région d'engagement d'outil (6) comprend une région de douille (12) avec un moyen d'engagement d'outil (13, 14).
  5. Bougie d'allumage selon la revendication 4, caractérisée en ce que le moyen d'engagement d'outil est au moins un alésage (13) et/ou au moins une rainure (14).
  6. Bougie d'allumage selon l'une quelconque des revendications précédentes, caractérisée en ce que la région d'engagement d'outil (6) est réalisée d'une seule pièce sur le boîtier (3) de la bougie d'allumage.
  7. Bougie d'allumage selon la revendication 1, caractérisée en ce que la région d'engagement d'outil (6) est disposée sur un moyen de raccordement électrique (8) disposé sur l'extrémité (11) du côté du raccordement.
  8. Bougie d'allumage selon la revendication 7, caractérisée en ce que la région d'engagement d'outil est disposée sur un élément d'extrémité (8) d'un boulon de raccordement (7).
  9. Bougie d'allumage selon la revendication 7 ou 8, caractérisée en ce que la région d'engagement d'outil (6) comprend, sur une surface frontale, du côté du raccordement, de la bougie d'allumage, un moyen d'engagement d'outil (15), en particulier une rainure et/ou un alésage.
  10. Bougie d'allumage selon l'une quelconque des revendications 7 à 9, caractérisée en ce que la région d'engagement d'outil comprend, latéralement sur un élément d'extrémité (8) du côté du raccordement, un moyen d'engagement d'outil (16), en particulier une rainure radiale.
  11. Bougie d'allumage selon l'une quelconque des revendications précédentes, caractérisée en ce que la bougie d'allumage présente des électrodes (9a, 9b) sur l'extrémité du côté de la chambre de combustion, ou en ce que la bougie d'allumage est une bougie d'allumage laser.
EP07787701A 2006-08-02 2007-07-18 Bougie d'allumage a espace de montage reduit Ceased EP2050171B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006035980A DE102006035980A1 (de) 2006-08-02 2006-08-02 Zündkerze mit reduziertem Bauraum
PCT/EP2007/057443 WO2008015107A1 (fr) 2006-08-02 2007-07-18 Bougie d'allumage à espace de montage réduit

Publications (2)

Publication Number Publication Date
EP2050171A1 EP2050171A1 (fr) 2009-04-22
EP2050171B1 true EP2050171B1 (fr) 2012-03-28

Family

ID=38520727

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07787701A Ceased EP2050171B1 (fr) 2006-08-02 2007-07-18 Bougie d'allumage a espace de montage reduit

Country Status (5)

Country Link
US (1) US8373337B2 (fr)
EP (1) EP2050171B1 (fr)
CN (1) CN101496242B (fr)
DE (1) DE102006035980A1 (fr)
WO (1) WO2008015107A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5572181B2 (ja) * 2012-06-12 2014-08-13 日本特殊陶業株式会社 点火プラグ及びその製造方法
DE102014011871A1 (de) * 2014-08-11 2015-10-08 Mtu Friedrichshafen Gmbh Zündkerze
BR112019024923A2 (pt) * 2017-05-26 2020-06-23 Swift Fuels, Llc Conjunto de vela de ignição
US11855417B2 (en) 2019-10-15 2023-12-26 Innio Jenbacher Gmbh & Co Og Spark plug and method for producing a spark plug
DE102020206970A1 (de) 2020-06-04 2021-12-09 Robert Bosch Gesellschaft mit beschränkter Haftung Zündkerze

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60230387A (ja) * 1984-04-26 1985-11-15 日本特殊陶業株式会社 スパ−クプラグ
JP3497001B2 (ja) * 1995-03-31 2004-02-16 日本特殊陶業株式会社 スパークプラグ
JPH11329666A (ja) * 1998-05-15 1999-11-30 Ngk Spark Plug Co Ltd スパークプラグ
DE19940455C2 (de) 1999-08-25 2003-06-18 Bosch Gmbh Robert Zündeinrichtung,insbesondere Zündkerze für Ottomotoren, und Verfahren zur Lackierung derselben
DE10047498A1 (de) 2000-09-26 2002-04-18 Bosch Gmbh Robert Zündkerze kompakter Bauart und Herstellungsverfahren
JP2002124362A (ja) * 2000-10-19 2002-04-26 Ngk Spark Plug Co Ltd 圧力センサ内蔵点火プラグ
JP4434473B2 (ja) * 2000-11-28 2010-03-17 日本特殊陶業株式会社 スパークプラグ
DE10257995B4 (de) * 2002-04-09 2011-03-24 Robert Bosch Gmbh Zündkerze
DE102004016555A1 (de) * 2004-04-03 2005-10-27 Robert Bosch Gmbh Zündkerze
JP2006009783A (ja) * 2004-05-21 2006-01-12 Denso Corp 内燃機関用点火装置
JP4293121B2 (ja) * 2004-11-29 2009-07-08 株式会社デンソー 内燃機関用のスパークプラグ
DE102005044267B4 (de) * 2005-09-16 2018-06-14 Robert Bosch Gmbh Zündkerze
US7772751B2 (en) * 2006-03-13 2010-08-10 Ngk Spark Plug Co., Ltd. Spark plug having a rear-end portion of a threaded portion that has a higher hardness than a crimp portion and method of manufacturing the same

Also Published As

Publication number Publication date
CN101496242A (zh) 2009-07-29
WO2008015107A1 (fr) 2008-02-07
US20100301733A1 (en) 2010-12-02
EP2050171A1 (fr) 2009-04-22
CN101496242B (zh) 2011-11-30
US8373337B2 (en) 2013-02-12
DE102006035980A1 (de) 2008-02-07

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