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WO2011069732A1 - Bougie d'allumage sans boîtier pour une machine à combustion interne - Google Patents

Bougie d'allumage sans boîtier pour une machine à combustion interne Download PDF

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Publication number
WO2011069732A1
WO2011069732A1 PCT/EP2010/065857 EP2010065857W WO2011069732A1 WO 2011069732 A1 WO2011069732 A1 WO 2011069732A1 EP 2010065857 W EP2010065857 W EP 2010065857W WO 2011069732 A1 WO2011069732 A1 WO 2011069732A1
Authority
WO
WIPO (PCT)
Prior art keywords
spark plug
insulator
seat support
combustion engine
internal combustion
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
PCT/EP2010/065857
Other languages
German (de)
English (en)
Inventor
Andreas Benz
Mario Fleischhauer
Jochen Fischer
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 WO2011069732A1 publication Critical patent/WO2011069732A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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

Definitions

  • the present invention relates to a caseless spark plug for a
  • spark plugs which have a thread on the housing and are screwed into the cylinder head.
  • the modern multi-valve technology with enlarged inlet and outlet ports as well as the close installation position at the injection valve required for direct injection require a constant reduction of the installation space for spark plugs. In particular, here refers to the space reduction to a reduced diameter of the spark plug.
  • the isolation of the high voltage between the two requires
  • Electrodes a minimum wall thickness. This minimum wall thickness of the insulation precludes the desired diameter reduction. The absence of a thread on the housing of the spark plug opens up possibilities for
  • the spark plug according to the invention with the features of claim 1 allows a spark plug without a housing.
  • the omission of a housing allows a reduction in the outer diameter of the spark plug and the cylinder head bore diameter.
  • the wall thicknesses of the insulator can be kept the same or increased if necessary.
  • the spark plug according to the invention especially in engines with multi-valve technology, enlarged inlet and outlet ports and / or direct injection very close to Injector be installed.
  • the minimum wall thickness for insulation of the high voltage can still be met, since according to the invention no space is consumed by a candle housing. All this will happen
  • An internal combustion engine comprising a clamp nut for clamping the spark plug in the internal combustion engine, a seat support over which the spark plug is supported in the internal combustion engine, a center electrode, at least one ground electrode disposed on the seat support, and an insulator around the center electrode from the ground electrode to separate. It clamps in the assembled state of the spark plug, the clamping nut on a
  • the nut is in direct contact with the insulator and in particular with the
  • Spark plug has the smallest possible outer diameter.
  • Seat support are formed as two separate, non-contacting parts.
  • the outer circumference of the entire spark plug according to the invention is characterized defined only in the area between the clamping nut and seat support by the insulator.
  • the seat support is designed as a sleeve on the insulator.
  • the seat support is thus a hollow cylindrical metallic component which is plugged as close to the combustion chamber as possible on the insulator.
  • At least one ground electrode is attached to this seat carrier, wherein the
  • Ground electrode on the seat support with the internal combustion engine or with the cylinder head is in electrical contact.
  • the seat support comprises an inner shoulder and an outer shoulder, wherein the insulator rests on the inner shoulder and wherein the
  • Outer paragraph is designed to support in the internal combustion engine.
  • the hollow cylindrical seat carrier has a tapered inner diameter, whereby the inner paragraph arises.
  • the insulator tapers toward the tip of the center electrode.
  • this taper of the insulator creates a bearing surface, with which the insulator rests on the inner shoulder of the seat support.
  • the inner shoulder on the seat support and the support surface on the insulator tapered, so that the insulator on
  • the outer shoulder on the insulator is preferably formed closer to the combustion chamber than the inner shoulder.
  • the seat support has an inner sealing surface towards the insulator and an outer sealing surface toward the internal combustion engine.
  • the inner sealing surface is preferably formed on the inner shoulder of the seat support.
  • the outer sealing surface is preferably formed on the outer shoulder of the seat support.
  • Sealing surface is directly in contact with the insulator and / or the outer
  • Sealing surface is designed for direct contact with the internal combustion engine. That is, the insulator is supported on the seat support without
  • the support area between insulator and seat support is preferably provided with a glaze.
  • Sealing element which is formed in prior art spark plugs usually as a metallic disc, reduces the probability of occurrence
  • the seal between seat support and internal combustion engine is preferably designed as a conical seat or flat sealing seat.
  • this seal can be sealed with a sufficiently accurate production of the flat surfaces on a flat sealing seat without sealing element.
  • the insulator preferably comprises an insulator shoulder.
  • This isolator shoulder with enlarged outer diameter forms on its upper side, so the brennraumferneren side, the Spannmutternabsatz over which the
  • Clamping nut transmits the tensioning force to the insulator.
  • the clamping nut sits cuff-like over the entire insulator shoulder, whereby the lower collar of the clamping nut can be crimped towards the insulator and thus creates a flared collar for captive protection.
  • the clamping nut sits cuff-like over the entire insulator shoulder, whereby the lower collar of the clamping nut can be crimped towards the insulator and thus creates a flared collar for captive protection.
  • Insulator shoulder shorter than the distance between the support surface of the
  • Spark plug and in particular the height of the collar is structurally designed so that the clamping nut before screwing into the cylinder head on the
  • the ground electrode is aligned with a mark on the spark plug to detect the position of the ground electrode in the spark plug
  • the seat carrier becomes one
  • the seat support is fastened by means of a further bead collar on the insulator.
  • a further bead collar on the insulator.
  • a first preferred variant provides that the crimp collar of the seat support surrounds a small shoulder on the insulator and thus the seat support is firmly connected to the insulator.
  • a second preferred variant provides that a small depression is provided in the insulator, the crimping collar of the seat carrier engaging in this depression. Preferably, this recess is formed completely circumferentially as a groove in the insulator.
  • the seat support thus has a crimp collar, which is formed in a recess of the insulator to ensure a positive connection of the components.
  • the recess of the ceramic of the insulator is advantageously in a range of thicker
  • Wall thickness so as not to reduce the electrical breakdown strength of the candle.
  • the depression between a seat of a central electrode head of the center electrode in the insulator and the support of the insulator on the inner shoulder need not be increased unnecessarily.
  • the surface of the recess is electrically conductive. To increase the electrical
  • Dielectric strength in the region of the depression is advantageously carried out electrically conductive and connected to the electrical potential of the seat support.
  • the electric field in the area of the depression becomes uniform and sliding sparks are suppressed.
  • the electrical line can preferably by applying electrically conductive layers on the
  • the spark plug according to the invention is mounted in the cylinder head or in the internal combustion engine as follows:
  • the spark plug is inserted into the cylinder head and preferably influences the position of the ground electrode by rotating the entire spark plug.
  • For detecting the position of the ground electrode is advantageously a mark on the
  • connection nut or on the connecting bolt wherein here preferably an axial or radial slot is attached.
  • an axial force is applied to the spark plug, which is greater than that of the
  • the spark plug can be mounted and biased without applying the axial force only by tightening the clamping nut.
  • the caseless spark plug according to the invention replaces existing spark plugs of conventional design with M12 thread or smaller.
  • FIG. 1 shows a housing-less spark plug according to the invention according to a first embodiment
  • Figure 2 is a detail view of a housing-less invention
  • Embodiments of the invention 1 shows a housing-less spark plug 1 according to the invention according to a first embodiment before tightening a clamping nut 3 in a cylinder head 2.
  • the cylinder head 2 is here a part of a
  • the spark plug 1 comprises an insulator 7 with clamping nut 3 seated thereon and a seat carrier 4 mounted on it.
  • a center electrode 5 In the insulator 7, a center electrode 5, a resistor chip 9 and a connecting bolt 8 are inserted.
  • Terminal bolt 8 is a connection nut 10 is screwed.
  • a ground electrode 6 is attached on the seat support 4.
  • the insulator 7 comprises three areas of constant diameter. In its upper region, between the connecting nut 10 and clamping screw 3, the insulator 7 has a first diameter D1. This first diameter D1 widens on an insulator shoulder 12 to a second diameter D2.
  • the insulator 7 has a constant third diameter D3.
  • This third diameter D3 is smaller than the first diameter D1 and smaller than the second diameter D2.
  • the insulator 7 tapers as far as a tip of the center electrode 5.
  • the region with the second diameter D2 extends over one
  • the clamping nut 3 sits like a sleeve over this insulator shoulder 12.
  • the lower collar of the clamping nut 3 is crimped inwardly at the transition from the second diameter D2 to the third diameter D3, whereby the first flared collar 13 is formed.
  • a clearance 23 is formed, wherein this clearance 23 has an inner diameter greater than the second diameter D2.
  • the axial free space length 24 of this free space 23 is greater than the shoulder length 22.
  • the clamping nut 3 is axially displaceable in a certain area on the insulator 7.
  • an external thread 14 is provided on the clamping nut 3.
  • the cylinder head 2 has a corresponding internal thread 34.
  • Dimensioning of the spark plug 1, in particular the free space length 23 and the shoulder length 23, is selected so that in the state shown in Figure 1, ie before tightening the clamping nut 3, the clamping nut 3 rests with its first flared collar 13 on the insulator shoulder 12, at the same time the thread 14 of the clamping nut 3 rests on the cylinder head 2, but not yet screwed in and at the same time the insulator 7 is seated in the seat support 4 and the seat support 4 rests in the cylinder head 2.
  • the insulator 7 comprises at the height of a head of
  • Center electrode 6 has a small, outwardly projecting shoulder 26.
  • the seat support 4 is crimped around this small shoulder 26, whereby the second flared collar 18 is formed.
  • the exact configuration of the seat support 4 will be explained in more detail with reference to Figure 2 and the second embodiment.
  • the geometric configuration of the seat support 4 is approximately equal to that in the second embodiment in the first embodiment.
  • Embodiments differ only in the crimping of the seat support 4 with the insulator. 7
  • housing-less spark plug 1 can be structurally designed.
  • the abandonment of a housing allows a reduction of
  • the wall thickness of the insulator in particular in the region close to the combustion chamber, for example at the third diameter D3, could be kept the same or increased.
  • the seat support 4 and the clamping nut 3 are, in contrast to a flow-molded housing, manufacturing technology relatively simple components.
  • FIG. 1 a second exemplary embodiment of the housing-less spark plug 1 according to the invention will be explained with reference to FIG.
  • Identical or functionally identical components are designated in the two embodiments with the same reference numerals.
  • the spark plugs 1 of the two embodiments are identical except for the crimping of the seat support 4 with the insulator 7.
  • Figure 2 shows how the insulator 7 rests with a support surface 15 on an inner shoulder 16 of the seat support 4.
  • the seat support 4 in turn comprises a
  • Support surface 15 the inner shoulder 16 and the outer shoulder 17 is identical in the first and second embodiments.
  • the insulator 7 of the second embodiment has a recess 19 formed as a circumferential groove on.
  • Recess 19 engages the second flared collar 18 of the seat support 4 a. By this recess 19 according to the second embodiment of the small paragraph 26 is avoided from the first embodiment. This will be the
  • the surface of the recess 19 is formed with an electrically conductive layer. As an alternative to this electrically conductive layer on the surface, embedding of an electrically conductive foil between the second flanging collar 18 and the depression 19 is also preferred.
  • the recess 19 is located in the axial direction of the spark plug 1 between the seat of the central electrode head 20 in the insulator 7 and the support surface 15 of the insulator 7 in the seat support 4th
  • the surface thereof is made electrically conductive and connected to the electrical potential of the seat support 4. In this case, the electric field in the recess 19 is more uniform and sliding sparks are suppressed.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Spark Plugs (AREA)

Abstract

L'invention concerne un bougie d'allumage sans boîtier (1) pour une machine à combustion interne, avec un écrou de serrage (3) destiné à serrer la bougie d'allumage (1) dans la machine à combustion interne, avec un support de siège (4) grâce auquel la bougie d'allumage (1) s'appuie dans la machine à combustion interne, avec une électrode centrale (5), avec au moins une électrode de masse (6) qui est disposée sur le support de siège (4) et avec un isolateur (7) destiné à séparer l'électrode centrale (5) de l'électrode de masse (6). Dans l'état serré, l'écrou de serrage (3) serre la bougie d'allumage (1) par un décrochement de l'écrou de serrage (11) sur l'isolateur (7), l'écrou de serrage (3) étant alors en contact direct avec l'isolateur (7).
PCT/EP2010/065857 2009-12-08 2010-10-21 Bougie d'allumage sans boîtier pour une machine à combustion interne Ceased WO2011069732A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009047678.4 2009-12-08
DE200910047678 DE102009047678A1 (de) 2009-12-08 2009-12-08 Gehäuselose Zündkerze für eine Verbrennungskraftmaschine

Publications (1)

Publication Number Publication Date
WO2011069732A1 true WO2011069732A1 (fr) 2011-06-16

Family

ID=43126902

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/065857 Ceased WO2011069732A1 (fr) 2009-12-08 2010-10-21 Bougie d'allumage sans boîtier pour une machine à combustion interne

Country Status (2)

Country Link
DE (1) DE102009047678A1 (fr)
WO (1) WO2011069732A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012126880A1 (fr) * 2011-03-18 2012-09-27 Piezocryst Advanced Sensorics Gmbh Isolateur pour une bougie d'allumage ayant une fonction de capteur, ainsi que bougie d'allumage ayant une fonction de capteur
WO2012163578A1 (fr) * 2011-05-27 2012-12-06 Robert Bosch Gmbh Bougie d'allumage ayant encombrement réduit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6120838B2 (ja) 2011-06-28 2017-04-26 フェデラル−モーグル・イグニション・カンパニーＦｅｄｅｒａｌ−Ｍｏｇｕｌ Ｉｇｎｉｔｉｏｎ Ｃｏｍｐａｎｙ スパークプラグ電極構成
DE102014223752A1 (de) * 2014-11-20 2016-05-25 Robert Bosch Gmbh Zündkerze mit verbesserter Verbindung zwischen Isolator und Gehäuse

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4989557A (en) * 1990-04-25 1991-02-05 General Motors Corporation Spark plug assembly for internal combustion engine
US5186132A (en) * 1990-09-03 1993-02-16 Friedrich Runge Spark plug for an internal combustion engine
EP1059714A1 (fr) * 1999-06-07 2000-12-13 Peugeot Citroen Automobiles SA Bougie d'allumage pour moteur à combustion interne.
DE10229338A1 (de) * 2002-06-29 2004-01-15 Robert Bosch Gmbh Zündkerze

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4989557A (en) * 1990-04-25 1991-02-05 General Motors Corporation Spark plug assembly for internal combustion engine
US5186132A (en) * 1990-09-03 1993-02-16 Friedrich Runge Spark plug for an internal combustion engine
EP1059714A1 (fr) * 1999-06-07 2000-12-13 Peugeot Citroen Automobiles SA Bougie d'allumage pour moteur à combustion interne.
DE10229338A1 (de) * 2002-06-29 2004-01-15 Robert Bosch Gmbh Zündkerze

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012126880A1 (fr) * 2011-03-18 2012-09-27 Piezocryst Advanced Sensorics Gmbh Isolateur pour une bougie d'allumage ayant une fonction de capteur, ainsi que bougie d'allumage ayant une fonction de capteur
WO2012163578A1 (fr) * 2011-05-27 2012-12-06 Robert Bosch Gmbh Bougie d'allumage ayant encombrement réduit

Also Published As

Publication number Publication date
DE102009047678A1 (de) 2011-06-09

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