CN102089946A - Installation space-optimized spark plug - Google Patents
Installation space-optimized spark plug Download PDFInfo
- Publication number
- CN102089946A CN102089946A CN200980126569XA CN200980126569A CN102089946A CN 102089946 A CN102089946 A CN 102089946A CN 200980126569X A CN200980126569X A CN 200980126569XA CN 200980126569 A CN200980126569 A CN 200980126569A CN 102089946 A CN102089946 A CN 102089946A
- Authority
- CN
- China
- Prior art keywords
- housing
- spark plug
- housing component
- combustion chamber
- insulator
- 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.)
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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
-
- 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
- H01T13/32—Sparking plugs characterised by features of the electrodes or insulation characterised by features of the earthed electrode
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Spark Plugs (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
The invention relates to a spark plug (1) for an internal combustion engine, comprising a metal housing (2) having a first housing part (21), particularly a housing seat, a second housing part (26), particularly a housing tube, a center electrode (4), a ground electrode (5) disposed at the first housing part (21), and an isolator (6) in order to separate the center electrode (4) from the ground electrode (5), wherein the first housing part (21) is closer to the combustion chamber than the second housing part (26), wherein the first housing part (21) has a housing seating surface (24) for the safe seating of the spark plug (1) in an installed state, and wherein a first wall thickness (D1) of the first housing part (21) is larger than a second wall thickness (D2) of the second housing part (26).
Description
Technical field
The present invention relates to a kind of spark plug that is used for the structure space optimization of internal combustion engine with binding nut.
Background technology
The spark plug that is used for internal combustion engine is known different designs from prior art.Such as from US5,091, a kind of spark plug with metal shell of single member is disclosed among the 672B.This spark plug is at this screw thread without any self, but is clamped in the cylinder head by nut.
Disclose a kind of spark plug from FR 2 779 014A1, this spark plug comprises insulator, target and at least one ground electrode.At this, this spark plug is tightened on by the nut of described insulator in cylinder head.This nut is set up ground connection contact simultaneously between ground electrode and cylinder head.
In addition, have screw thread and be tightened on spark plug the cylinder head at housing from known in the state of the art.Modern many valve technologies have enlarged access road and exit passageway and desired at installation site requirement constantly reduction structure space very near on the injection valve for straight spray on spark plug.Especially here the reduction of structure space relates to the dwindling of diameter of spark plug.But, the high-tension insulating requirements minimum wall thickness (MINI W.) between described two electrodes.This minimum wall thickness (MINI W.) of insulator runs counter to desired diameter to be reduced.Abandon screw thread on the housing of spark plug, this provides the possibility that is used to reduce diameter and therefore is used to reduce structure space.
Summary of the invention
With respect to this, have such advantage by the spark plug with the described feature of claim 1 of the present invention, promptly diameter is compared and can significantly be reduced with traditional spark plug.Can construct whole spark plug more very thin thus and especially also can reduce the necessary structure space that is used for spark plug.Can make the placement location of spark plug such as much closer by the present invention thus from spraying.According to the present invention, be provided with the housing of two members, wherein said two housing components have different wall thickness, and wherein especially the tube construction of thin-walled is favourable.Can dwindle the overall diameter of spark plug thus and can reduce hole in the cylinder head, the wall thickness of wherein said insulator can keep identical or can enlarge in case of necessity.In addition, spark plug is supported by the housing seating face.Because the housing by spark plug of the present invention has the cross section that significantly improves on this position of housing seating face, heat and electric current are directed into the cylinder head best from ground electrode by this housing seating face.This point realizes in the following manner by the present invention, promptly be provided with the spark plug that is used for internal combustion engine, this spark plug comprises with lower member: two members have especially especially housing, target, an insulator that is arranged in the ground electrode on described first housing component and is used for target and ground electrode are separated of the metal of housing pipe of housing seat and second housing component of first housing component.Said first housing component that is to say the cylinder such as more close internal combustion engine than the more close combustion chamber of described second housing component.In addition, described first housing component has and is used for making spark plug to be placed in the housing seating face of the state of installation reliably.In addition, first wall thickness of described first housing component is greater than second wall thickness of described second housing component.Produce this point thus, promptly perpendicular to the cross-sectional area of the longitudinal axis of the spark plug of described first housing component greater than cross-sectional area perpendicular to the longitudinal axis of the spark plug of described second housing component.
Dependent claims shows preferred improvement project of the present invention.
In addition, advantageously, described housing seating face tilts with respect to the longitudinal axis of spark plug.By described housing seating face spark plug is felt relieved via the conical surfaces in other words of described inclination thus.
In other favourable design, be supported on the inside convex shoulder of described first housing component by the insulator of spark plug of the present invention.In addition, advantageously, on this bearing-surface, be provided with potted component.Space between housing and the insulator is sealed reliably with respect to the combustion chamber thus.
As the replacement scheme of laying of insulator on first housing component, preferred described insulator can be placed on second housing component, and wherein first housing component also has inner convex shoulder here.In addition, in this case second housing component have inside sensing towards the end of combustion chamber, on this end, laying described insulator.In favourable design, the end distortion of more close combustion chamber of the inside sensing of described second housing component is formed on the inside convex shoulder of described first housing component in other words at this.On this end of described second housing component, laying described insulator.Forming between housing and the insulator here thus with respect to the sealing surface of combustion chamber end by described second housing component.
In addition, preferably, described housing seating face is than the more close combustion chamber of inside convex shoulder on first housing component.Sometimes heat sensitive sealing surface is moved behind the combustion chamber slightly between the insulator and first housing component thus.
In addition, preferred described spark plug comprises binding nut, is used for spark plug is clamped in cylinder head in the axial direction.The screw thread on the housing can be abandoned thus, thereby the very thin especially design of spark plug can be realized.Clamp the sealing that guaranteed between insulator and the housing seat and the sealing of the outside between housing seat and the cylinder head with binding nut.In addition, spark plug is supported towards the housing seating face by means of binding nut thus.
In addition, advantageously, described second housing component has at least one tongue piece on the end of combustion chamber dorsad, and described tongue piece especially base area electrode comes directed.Outwardly-bent by described tongue piece especially three tongue pieces can prevent that especially binding nut is towards the direction landing of a side of combustion chamber dorsad.Described thus tongue piece is fulfiled the anti-lost function of binding nut here.What may press on the one hand is, will be by the inner orientation at internal combustion engine of the ground electrode of spark plug of the present invention.Therefore advantageously, the position of described tongue piece is coordinated consistent in other words with the position of ground electrode mutually.Therefore such as ground electrode being fixed under the situation about pointing to towards tongue piece or can made tongue piece crooked under situation about pointing to towards ground electrode.The orientation of ground electrode in the combustion chamber can be undertaken by simple rotation spark plug.The position of ground electrode in the combustion chamber can be found out from the position of tongue piece after installing.Certainly, this consistency of tongue piece and ground electrode also can be accomplished on a plurality of electrodes.Therefore such as for three ground electrodes, showing described position by three tongue pieces.
In addition preferably, described first housing component especially is connected with described second housing component by means of laser welding with fixing.This has made things convenient for the accurate adjusting by the installation of spark plug of the present invention and electrode spacing.
In addition advantageously, described second housing component has enlarged-diameter portion, described enlarged-diameter portion especially has fold, and wherein enlarged-diameter portion is that bead and/or the wherein said enlarged-diameter portion that is used for binding nut makes described second housing component and insulator relative to each other fixing.Thus, by the simple shaping of described second housing component, not only can be provided for the bead of binding nut but also being connected between insulator and the housing is optimized.
In addition preferably, described first housing component has especially convex shoulder of electrode protrusion in its side near the combustion chamber, has fixed at least one ground electrode on this electrode protrusion.In this case, the enough surface end faces especially radially of fixedly providing of at least one ground electrode are provided described electrode protrusion.Guarantee the conduction and the capacity of heat transmission between first housing component and one or more ground electrode thus.
In addition advantageously, second housing component is configured to the sheet material pipe, and/or first housing component (21) is configured to the turning part.In this case, advantageously, second housing component is configured to the sheet material pipe, and the diameter of the wall ratio sheet material pipe that this sheet material pipe is had is much smaller.By first housing component, not only can but also electric current can be conducted to the cylinder head from ground electrode heat.For the conduction of this effective heat and electric current, the volume that certain quality is certain in other words must need.With respect to this, can in the zone of second housing component, just in zone, save quality away from the combustion chamber.For this reason, the sheet material pipe of thin-walled is suitable for saving quality and saves diameter, and described sheet material pipe also can be made originally with cheap one-tenth.The wall thickness of preferred said first housing component on each position all the time greater than the thickest of second housing component.
Because heat conduction and conduction are mainly undertaken by the housing seating face, so advantageously, described first wall thickness has maximum on the height of housing seating face.In such an embodiment, described first wall thickness is preferably big 4 to 5 times than second wall thickness of housing pipe.In addition, second wall thickness of housing pipe is preferably constant.In addition preferably, described first wall thickness is all the time greater than second wall thickness.
Description of drawings
With reference to the accompanying drawings two kinds of preferred embodiments of the present invention are described.Accompanying drawing illustrates:
Fig. 1 is the schematic diagram that dissects by the part under the situation in being installed in cylinder head of the spark plug by first embodiment of the present invention,
Fig. 2 is by the detail view under the situation in being installed in cylinder head of the spark plug by second embodiment of the present invention.
Embodiment
Below with reference to Fig. 1 the spark plug 1 by the first embodiment of the present invention is described.
As can be finding out among Fig. 1, spark plug 1 be installed in the cylinder head 9.This spark plug 1 comprises housing 2, and this housing 2 has housing seat 21 (first housing component), housing pipe 26 (second housing component) and binding nut 3 and target 4, ground electrode 5 and insulator 6.
Have the webge contact 11 and the first cone 13a and the second cone 13b on described spark plug 1 end in the above.Described webge contact 11 is used to make spark plug 1 to be electrically connected with igniter.Described cone 13a and 13b are used for ignition plug is plugged into spark plug 1.
Described housing seat 21 is at its convex shoulder 22 and inner convex shoulder 23 that has annular on end of combustion chamber dorsad.Housing seating face 24 and electrode protrusion 25 on the end of combustion chamber, have been arranged at this housing seat 21.
The convex shoulder 22 of described annular is used for that housing seat 21 is inserted into housing pipe 26 and improves the stability of this connecting portion.
Described inner convex shoulder 23 is used for insulator 6 is bearing in housing seat 21.Simultaneously, form the sealing position here, be used for the space between housing and the insulator being sealed with respect to the combustion chamber.The sealing position obtains sealing by potted component 7.
Described housing seating face 24 is taper towards the directional structure vectorical structure of combustion chamber.Housing seating face 24 not only bears the clamping force of binding nut 3 and continues it is delivered in the cylinder head 9 thus, and is used for spark plug 1 in cylinder head 9 centering.In addition, not only be transmitted to the cylinder head 9 from ground electrode 5 by this housing seating face 24 with voltage but also with heat.In addition, described housing seating face 24 with its conical seat shape be configured between combustion chamber and cylinder head 9, seal.Housing seat 21 has the first maximum wall thickness D1 (referring to Fig. 2) on its thickest position, end on housing seating face 24.This first wall thickness D1 is bigger 4 to 5 times than the second wall thickness D2 (referring to Fig. 2) of housing pipe 26.As can be as seen from Figure 1, the second wall thickness D2 of described housing pipe 26 be constant.In addition, the described first wall thickness D1 is all the time greater than the described second wall thickness D2.
The endoporus towards the combustion chamber of described housing seat 21 constitutes described electrode protrusion 25, is used for radially obtaining for the fixing of one or more ground electrode 5 enough end faces.On the end of this electrode protrusion 25, settled ground electrode 5.
Described housing pipe 26 has enlarged-diameter portion 27 on the halfbody of combustion chamber dorsad at it, and 27 in this enlarged-diameter portion has fold 27a.Connecting pipe end 28 above described enlarged-diameter portion, wherein the end of this pipe end 28 is configured to tongue piece 29 again.
Described insulator 6 at least in part aspect its outline corresponding to the interior profile of housing pipe 26 and enlarged-diameter portion 27 thereof.Especially in axial direction guarantee being connected between housing pipe 26 and the insulator 6 thus.
Described binding nut 3 is maintained by the tongue piece 29 of the bending of housing pipe end 28.Spark plug 1 and binding nut 3 produce the member that can easily mount and dismount that links together thus.Binding nut 3 is expressed to insulator 6 in the inside convex shoulder 23 of housing seat 21 by housing pipe 26.This housing seat 21 is clamped in the cylinder head 9 in other words by the extruding of the corresponding pairing face 91 (referring to Fig. 1) in housing seating face 24 and the cylinder head 9 again.Apply pretightning force by binding nut 3 thus, this pretightning force realized insulator 6 on housing seat 21 sealing and realized the sealing of housing seat 21 with respect to cylinder head 9.In the state that does not clamp, spark plug 1 needn't be in airtight conditions forcibly.In order to satisfy this function, binding nut 3 has screw thread 31 and tool engagement structure 32.In cylinder head 9, be provided with corresponding pairing screw thread with respect to screw thread 31.
In addition as can be seen, housing seat 21 is connected with housing component 26 by method for laser welding and has weld seam 8 thus.
The explanation detailed according to this part, the huge advantage that obtains to press spark plug 1 of the present invention with respect to prior art.Abandon screw thread on housing 2, this provides the possibility of the diameter in the hole that is used for reducing cylinder head 9.Housing 2 is separated into doing rule and can realizing very thin tube construction in a side of the combustion chamber dorsad of spark plug 1 of housing pipe 26 and housing seat 21.In addition, by carry out by means of binding nut 3 fixing can make spark plug 1 in finally being clamped in cylinder head 9 before rotation.Can make ground electrode 5 such as directed thus towards spraying.
Now in Fig. 2, the spark plug 1 by the second embodiment of the present invention is described below.The member that identical function in other words is identical is here used and is illustrated with Reference numeral identical in first embodiment.
Fig. 2 shows by the detail view under the situation in being installed in cylinder head 9 of the spark plug of described second embodiment.Opposite with first embodiment, this second embodiment does not have seal 7 on inner convex shoulder 23.Replace this seal 7 here and make being formed on the described inner convex shoulder 23 of housing pipe 26 towards the end of combustion chamber 26a.Produce sealing by insulator 6 being pressed on housing seat 21 or its inner convex shoulder 23 here.
In addition, can find out the pairing face 91 of cylinder head 9 here well, the housing seating face 24 of described taper is supported on this pairing face 91.
In addition, Fig. 2 shows the tangible difference between the second wall thickness D2 of tube construction of thin-walled of the first wall thickness D1 of the housing seat 21 that solid turning part that described conduct has very high stability makes and described housing pipe 26.
When spark plug 1 is installed, should consider following steps: housing seat 21 and housing pipe 26 are joined to one another.Can or afterwards ground electrode be fixed on the housing seat 21 before connecting.Fix under the situation that the tongue piece 29 towards described housing pipe 26 points at this.Subsequently insulator 6 is installed in the housing 2.The pipe end 28 of housing pipe 26 is formed on the insulator by convex shoulder and produces the enlarged-diameter portion 27 of housing pipe 26 thus.Also be resisted against on the insulator 6 at this tongue piece 29.In next procedure, binding nut 3 is inserted on the insulator 6.In axial direction insulator 6 is pressed onto in the housing seat 21 with the power that is equal to, or greater than pretightning force essential for air-tightness by binding nut 3.Under pretightning force, regulate electrode spacing.Before binding nut 3 unloadings, preferably make housing pipe 26 carry out plastic deformation by radially being pressed into of fold 27a.After unloading, in housing 2, exist pretightning force by described plastic deformation, this pretightning force is being fixed insulator 6 and is being prevented moving of electrode spacing.Bending by tongue piece 29 fixes to clamp nut 3 anti-lostly.
Claims (12)
1. be used for the spark plug of internal combustion engine, comprise
The housing of-metal (2), this housing (2) have especially housing seat and second housing component (26) housing pipe especially of first housing component (21),
-target (4),
-ground electrode (5), this ground electrode (5) be arranged on described first housing component (21) and
-be used for insulator (6) that described target (4) and described ground electrode (5) are separated,
Wherein, described first housing component (21) is than the more close combustion chamber of described second housing component (26),
Wherein, described first housing component (21) has and is used for making described spark plug (1) to be placed in the housing seating face (24) of the state of installation reliably, and
Wherein, first wall thickness (D1) of described first housing component (21) is greater than second wall thickness (D2) of described second housing component (26).
2. by the described spark plug of claim 1, it is characterized in that described housing seating face (24) tilts with respect to the longitudinal axis (X-X) of described spark plug (1).
3. by each described spark plug in the aforementioned claim, it is characterized in that described first housing component (21) has inner convex shoulder (23), wherein, described insulator (6) is placed on this inside convex shoulder (23).
4. by each described spark plug in the claim 1 or 2, it is characterized in that, described first housing component (21) has inner convex shoulder (23), and described second housing component (26) has the end towards the combustion chamber (26a) of inside sensing, and described insulator (6) is placed on this end (26a).
5. by each described spark plug in the claim 3 or 4, it is characterized in that described housing seating face (24) is than the more close combustion chamber of described inner convex shoulder (23).
6. by each described spark plug in the aforementioned claim, in addition, comprise binding nut (3), be used for described spark plug is clamped in cylinder head.
7. by each described spark plug in the aforementioned claim, it is characterized in that described second housing component (26) has at least one tongue piece (29) on the end of combustion chamber dorsad, this tongue piece (29) especially base area electrode (5) comes directed.
8. by each described spark plug in the aforementioned claim, it is characterized in that described first housing component (21) especially is connected with described second housing component (26) regularly by means of being welded to connect (8).
9. by each described spark plug in the claim 6 to 8, it is characterized in that, described second housing component (26) has enlarged-diameter portion (27), described enlarged-diameter portion (27) especially has fold (27a), wherein, described enlarged-diameter portion (27) is that bead and/or the wherein said enlarged-diameter portion (27) that is used for binding nut (3) makes described second housing component (26) and described insulator (6) relative to each other fixing.
10. by each described spark plug in the aforementioned claim, it is characterized in that described first housing component (21) comprises electrode protrusion (25) in its side near the combustion chamber, is fixing at least one ground electrode (5) on this electrode protrusion (25).
11. by each described spark plug in the aforementioned claim, it is characterized in that described second housing component (26) is configured to the sheet material pipe, and/or described first housing component (21) is fabricated to the turning part.
12., it is characterized in that described first wall thickness (D1) has maximum on the height of described housing seating face (24) by each described spark plug in the aforementioned claim.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008040285A DE102008040285A1 (en) | 2008-07-09 | 2008-07-09 | Space-optimized spark plug |
| DE102008040285.0 | 2008-07-09 | ||
| PCT/EP2009/056508 WO2010003733A1 (en) | 2008-07-09 | 2009-05-28 | Installation space-optimized spark plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102089946A true CN102089946A (en) | 2011-06-08 |
Family
ID=40897566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200980126569XA Pending CN102089946A (en) | 2008-07-09 | 2009-05-28 | Installation space-optimized spark plug |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP2301121B1 (en) |
| JP (1) | JP2011527491A (en) |
| CN (1) | CN102089946A (en) |
| AT (1) | ATE545183T1 (en) |
| DE (1) | DE102008040285A1 (en) |
| WO (1) | WO2010003733A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017117452B4 (en) | 2016-08-16 | 2022-02-10 | Federal-Mogul Ignition Gmbh | Spark plug and method for its manufacture |
Citations (5)
| 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 |
| DE19500216A1 (en) * | 1995-01-05 | 1996-07-11 | Stihl Maschf Andreas | Decompression valve for IC engine of small hand-tool, e.g. chain saw |
| US20020195917A1 (en) * | 2001-06-20 | 2002-12-26 | Hiromi Hiramatsu | Method for fabricating spark plug with piezoelectric sensor and spark plug fabricated by the same |
| EP1385242A1 (en) * | 2002-07-22 | 2004-01-28 | Jenbacher Aktiengesellschaft | Spark plug |
| WO2008031482A1 (en) * | 2006-09-16 | 2008-03-20 | Multitorch Gmbh | Spark plug |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62167392U (en) * | 1986-04-15 | 1987-10-23 | ||
| US5014656A (en) * | 1990-04-25 | 1991-05-14 | General Motors Corporation | Internal combustion engine having a permanent ground electrode and replaceable center electrode element |
| US5091672A (en) * | 1990-06-26 | 1992-02-25 | Allied-Signal Inc. | Shield for aligning a ground electrode of a spark plug in a cylinder head |
| US5535726A (en) * | 1995-05-05 | 1996-07-16 | Cooper Industries, Inc. | Automotive ignition coil assembly |
| JPH11329666A (en) * | 1998-05-15 | 1999-11-30 | Ngk Spark Plug Co Ltd | Spark plug |
| FR2779014B1 (en) | 1998-05-22 | 2000-07-28 | Sagem | SPARK PLUG FOR CONTROLLED IGNITION ENGINE |
| JPH11351115A (en) * | 1998-06-12 | 1999-12-21 | Ngk Spark Plug Co Ltd | Internal combustion engine, spark plug assembly, cylinder head, spark plug and plug fixture |
| JP2006012464A (en) * | 2004-06-22 | 2006-01-12 | Ngk Spark Plug Co Ltd | Spark plug and internal combustion engine having the same |
-
2008
- 2008-07-09 DE DE102008040285A patent/DE102008040285A1/en not_active Withdrawn
-
2009
- 2009-05-28 AT AT09779565T patent/ATE545183T1/en active
- 2009-05-28 EP EP09779565A patent/EP2301121B1/en not_active Not-in-force
- 2009-05-28 CN CN200980126569XA patent/CN102089946A/en active Pending
- 2009-05-28 WO PCT/EP2009/056508 patent/WO2010003733A1/en active Application Filing
- 2009-05-28 JP JP2011517051A patent/JP2011527491A/en active Pending
Patent Citations (5)
| 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 |
| DE19500216A1 (en) * | 1995-01-05 | 1996-07-11 | Stihl Maschf Andreas | Decompression valve for IC engine of small hand-tool, e.g. chain saw |
| US20020195917A1 (en) * | 2001-06-20 | 2002-12-26 | Hiromi Hiramatsu | Method for fabricating spark plug with piezoelectric sensor and spark plug fabricated by the same |
| EP1385242A1 (en) * | 2002-07-22 | 2004-01-28 | Jenbacher Aktiengesellschaft | Spark plug |
| WO2008031482A1 (en) * | 2006-09-16 | 2008-03-20 | Multitorch Gmbh | Spark plug |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2301121B1 (en) | 2012-02-08 |
| DE102008040285A1 (en) | 2010-01-14 |
| ATE545183T1 (en) | 2012-02-15 |
| JP2011527491A (en) | 2011-10-27 |
| WO2010003733A1 (en) | 2010-01-14 |
| EP2301121A1 (en) | 2011-03-30 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110608 |