CA2826807A1 - Spark plug with end part - Google Patents
Spark plug with end part Download PDFInfo
- Publication number
- CA2826807A1 CA2826807A1 CA2826807A CA2826807A CA2826807A1 CA 2826807 A1 CA2826807 A1 CA 2826807A1 CA 2826807 A CA2826807 A CA 2826807A CA 2826807 A CA2826807 A CA 2826807A CA 2826807 A1 CA2826807 A1 CA 2826807A1
- Authority
- CA
- Canada
- Prior art keywords
- spark plug
- wall
- ground electrode
- combustion chamber
- 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.)
- Abandoned
Links
- 238000002485 combustion reaction Methods 0.000 claims abstract description 66
- 238000003466 welding Methods 0.000 claims description 58
- 229910000510 noble metal Inorganic materials 0.000 claims description 16
- 229910045601 alloy Inorganic materials 0.000 claims description 10
- 239000000956 alloy Substances 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 13
- 238000010276 construction Methods 0.000 description 12
- 230000017525 heat dissipation Effects 0.000 description 10
- 238000013461 design Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 238000009826 distribution Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- H01T13/46—Sparking plugs having two or more spark gaps
- H01T13/467—Sparking plugs having two or more spark gaps in parallel connection
-
- 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
- H01T13/54—Sparking plugs having electrodes arranged in a partly-enclosed ignition chamber
Landscapes
- Spark Plugs (AREA)
Abstract
The present invention relates to a spark plug of an internal combustion engine, preferably for spark-ignition gas engines, comprising a spark plug housing (2) that surrounds an insulating body (1) and comprising a center electrode (3) and at least one ground electrode (4) borne by a ground electrode carrier (6), wherein the ignition surfaces (12) of the center electrode (3) and the ignition surface (26) of the ground electrode (4) are surrounded by a wall (8), which forms a chamber (5) open on the combustion chamber side or a pre-chamber (51) having passage openings (10). According to the invention, an end part (60) is attached to the end area of the spark plug housing (2) on the combustion chamber side, and the ground electrode carrier (6) and the wall (8) are borne by said end part (60).
Description
SPARK PLUG WITH END PART
The invention relates to a spark plug according to the preamble of Patent Claim 1.
Such spark plugs are known from WO 2009/059339 Al.
It is the aim of the invention to simplify the production of such spark plugs, especially with regard to the avoidance of complex components which are complicated to manufacture and with regard to the construction of the spark plug from simply producible parts. This is especially of importance for mass production.
Furthermore, the electrical properties of such spark plugs are to at least correspond to those of comparable spark plugs, if not surpassing these properties.
Accordingly, an optimum current conduction over the individual ground electrodes is to be ensured. Finally, the spark characteristics are to be improved, preferably by optimizing the conductivity and the heat dissipation from the ignition surfaces, in order to achieve better stability.
These aims are achieved in a spark plug of the type referred to in the introduction having the features which are cited in the characterizing part of Claim 1. The end part extends the spark plug housing and it allows the electrode arrangement to be of a short and compact design. Heat dissipation from the electrodes, current distribution, resistance to corrosion and ignition reliability are therefore significantly improved. An essential reason for this lies in the shorter overall height or in the proximity of the electrodes to the insulating body.
It is advantageous if the ground electrode carrier, as seen perpendicularly to the longitudinal axis of the spark plug, has a smaller distance from the centre electrode than the inner surface of the wall of the chamber and supports at least one finger-like ground electrode with an ignition surface which lies at the height level of the ignition surface of the centre electrode in the chamber, or if the ground electrode carrier, as
The invention relates to a spark plug according to the preamble of Patent Claim 1.
Such spark plugs are known from WO 2009/059339 Al.
It is the aim of the invention to simplify the production of such spark plugs, especially with regard to the avoidance of complex components which are complicated to manufacture and with regard to the construction of the spark plug from simply producible parts. This is especially of importance for mass production.
Furthermore, the electrical properties of such spark plugs are to at least correspond to those of comparable spark plugs, if not surpassing these properties.
Accordingly, an optimum current conduction over the individual ground electrodes is to be ensured. Finally, the spark characteristics are to be improved, preferably by optimizing the conductivity and the heat dissipation from the ignition surfaces, in order to achieve better stability.
These aims are achieved in a spark plug of the type referred to in the introduction having the features which are cited in the characterizing part of Claim 1. The end part extends the spark plug housing and it allows the electrode arrangement to be of a short and compact design. Heat dissipation from the electrodes, current distribution, resistance to corrosion and ignition reliability are therefore significantly improved. An essential reason for this lies in the shorter overall height or in the proximity of the electrodes to the insulating body.
It is advantageous if the ground electrode carrier, as seen perpendicularly to the longitudinal axis of the spark plug, has a smaller distance from the centre electrode than the inner surface of the wall of the chamber and supports at least one finger-like ground electrode with an ignition surface which lies at the height level of the ignition surface of the centre electrode in the chamber, or if the ground electrode carrier, as
2 seen perpendicularly to the longitudinal axis of the spark plug, has a greater distance from the centre electrode than the outer surface of the wall of the chamber and supports at least one finger-like ground electrode which extends through a recess in the wall into the chamber, wherein the ignition surface of the ground electrode lies at the height level of the ignition surface of the centre electrode in the chamber. A compact electrode construction, which can be produced in a simple manner and can be installed on the end part, is thereby achieved.
The arrangement of the ground electrodes on a separate carrier ensures a uniform current conduction over the ground electrodes. Since the ground electrode carrier is arranged at a distance from the wall of the chamber, the ground electrodes and the ground electrode carrier represent a system which is independent with regard to the current and heat conduction from the wall of the chamber. This enables a simple readjustment of the ground electrodes and the application-induced electrode consumption can be easily corrected. On account of the possibility of manufacturing the ground electrode carrier and the ground electrodes independently, especially as a one-piece component, and locating these on the end part, significant production-related advantages ensue.
Furthermore, as a result of the fact that the ground electrodes can be manufactured together with the ground electrode carrier as a one-piece component, and that a gap exists between the ground electrode carrier and the wall of the chamber, improved heat dissipation from the ignition electrodes to the end part and to the spark plug housing is achieved. The special shape of the ground electrodes and their arrangement provide further advantages with regard to an improved ignition performance and screening or flow-through of the chamber, even if the height of the electrodes which are arranged on the end part is smaller than in the case of comparable conventional spark plugs.
An especially simple manufacture with a stable construction of the spark plug is achieved as a result of the special shape
The arrangement of the ground electrodes on a separate carrier ensures a uniform current conduction over the ground electrodes. Since the ground electrode carrier is arranged at a distance from the wall of the chamber, the ground electrodes and the ground electrode carrier represent a system which is independent with regard to the current and heat conduction from the wall of the chamber. This enables a simple readjustment of the ground electrodes and the application-induced electrode consumption can be easily corrected. On account of the possibility of manufacturing the ground electrode carrier and the ground electrodes independently, especially as a one-piece component, and locating these on the end part, significant production-related advantages ensue.
Furthermore, as a result of the fact that the ground electrodes can be manufactured together with the ground electrode carrier as a one-piece component, and that a gap exists between the ground electrode carrier and the wall of the chamber, improved heat dissipation from the ignition electrodes to the end part and to the spark plug housing is achieved. The special shape of the ground electrodes and their arrangement provide further advantages with regard to an improved ignition performance and screening or flow-through of the chamber, even if the height of the electrodes which are arranged on the end part is smaller than in the case of comparable conventional spark plugs.
An especially simple manufacture with a stable construction of the spark plug is achieved as a result of the special shape
3 of the ground electrode carrier. The ground electrode carrier, having a cylindrical ring-shaped cross section, can be adjusted in a simple manner at a circumferentially constant distance from the outer surface of the wall of the chamber so that defined conditions with regard to combustion and current conduction are created. Furthermore, the construction and the installation of the spark plug are simplified since the cylindrical ring-shaped ground electrode carrier and also the chamber having a cylindrical ring-shaped cross section can be seated in a simple manner upon the end part and fastened there. This advantageous fastening is achieved if the ground electrode carrier and the wall are supported by the end part which is arranged on the combustion chamber-side end region of the spark plug housing.
The ground electrode carrier can be formed with a thread on its inner wall surface or else can have a smooth surface, the same applying to the wall of the chamber.
Either the ground electrode carrier or the wall of the chamber are screwed onto the respective projecting end shoulders of the end part and/or are fixed in their position by means of welding, or these components are pushed onto the end part, with a seating which is accurate as possible, and fixed in their desired position, especially by means of welding.
Provision can be made for the forming of two concentrically disposed cylindrical end shoulders on the end part, of which the inner end shoulder, if applicable, projects beyond the outer end shoulder in the direction of the combustion chamber, wherein the ground electrode carrier, together with the ground electrodes which penetrate the walls, is seated, pushed or screwed on the outer end shoulder and/or fastened by means of spot welding or seam welding, as applicable, and the wall of the chamber is seated, pushed or screwed on the inner end shoulder and/or fastened by means of spot welding or seam welding, as applicable, or wherein the wall of the chamber is seated, pushed or screwed on the outer end shoulder and/or fastened by means of spot welding or seam welding, as applicable, and the ground
The ground electrode carrier can be formed with a thread on its inner wall surface or else can have a smooth surface, the same applying to the wall of the chamber.
Either the ground electrode carrier or the wall of the chamber are screwed onto the respective projecting end shoulders of the end part and/or are fixed in their position by means of welding, or these components are pushed onto the end part, with a seating which is accurate as possible, and fixed in their desired position, especially by means of welding.
Provision can be made for the forming of two concentrically disposed cylindrical end shoulders on the end part, of which the inner end shoulder, if applicable, projects beyond the outer end shoulder in the direction of the combustion chamber, wherein the ground electrode carrier, together with the ground electrodes which penetrate the walls, is seated, pushed or screwed on the outer end shoulder and/or fastened by means of spot welding or seam welding, as applicable, and the wall of the chamber is seated, pushed or screwed on the inner end shoulder and/or fastened by means of spot welding or seam welding, as applicable, or wherein the wall of the chamber is seated, pushed or screwed on the outer end shoulder and/or fastened by means of spot welding or seam welding, as applicable, and the ground
4 electrode carrier, which lies at a distance from the inner surface of the wall, is seated, pushed or screwed on the inner end shoulder and/or fastened by means of spot welding or seam welding, as applicable.
It is advantageous if the end part is formed in one piece with the wall, wherein the ground electrode carrier is seated, pushed or screwed onto the end part and/or fastened by means of spot welding or seam welding, as applicable, or if the end part is formed in one piece with the ground electrode carrier, wherein the wall, which encompasses the ground electrode carrier at a distance, is seated, pushed or screwed onto the end part and/or fastened by means of spot welding or seam welding, as applicable.
In this way, the production of the spark plug is simplified and the spark plug housing is extended with the same overall length of the spark plug. With the same overall length of the spark plug, better heat dissipation from the ground electrode and from the wall into the spark plug housing ensues and the risk of spontaneous ignitions is reduced.
In principle, the ground electrode carrier could additionally also be fastened on the combustion chamber-side end region of the spark plug housing.
Advantages in relation to production ensue if the ground electrode carrier, as seen perpendicularly to the longitudinal axis of the spark plug, has in section at least partially circular cross section or is formed by a cylindrical ring and/or if the at least one ground electrode and the ground electrode carrier are formed in one piece or are interconnected by means of welding.
With regard to the thermal endurance of the spark plug, it is advantageous if through-openings are formed in the wall for passage of the combustion gas.
For the function of the spark plug, advantages ensue if the ground electrode carrier supports one, three or five ground electrodes and/or if the ground electrodes are arranged on the ground electrode carrier in a distributed manner around the centre electrode at equal distances from each other and/or if each of the ground electrodes, which project from the ground electrode carrier, has a rectangular or cylindrical ring
It is advantageous if the end part is formed in one piece with the wall, wherein the ground electrode carrier is seated, pushed or screwed onto the end part and/or fastened by means of spot welding or seam welding, as applicable, or if the end part is formed in one piece with the ground electrode carrier, wherein the wall, which encompasses the ground electrode carrier at a distance, is seated, pushed or screwed onto the end part and/or fastened by means of spot welding or seam welding, as applicable.
In this way, the production of the spark plug is simplified and the spark plug housing is extended with the same overall length of the spark plug. With the same overall length of the spark plug, better heat dissipation from the ground electrode and from the wall into the spark plug housing ensues and the risk of spontaneous ignitions is reduced.
In principle, the ground electrode carrier could additionally also be fastened on the combustion chamber-side end region of the spark plug housing.
Advantages in relation to production ensue if the ground electrode carrier, as seen perpendicularly to the longitudinal axis of the spark plug, has in section at least partially circular cross section or is formed by a cylindrical ring and/or if the at least one ground electrode and the ground electrode carrier are formed in one piece or are interconnected by means of welding.
With regard to the thermal endurance of the spark plug, it is advantageous if through-openings are formed in the wall for passage of the combustion gas.
For the function of the spark plug, advantages ensue if the ground electrode carrier supports one, three or five ground electrodes and/or if the ground electrodes are arranged on the ground electrode carrier in a distributed manner around the centre electrode at equal distances from each other and/or if each of the ground electrodes, which project from the ground electrode carrier, has a rectangular or cylindrical ring
5 segment-like cross section, at least in sub-sections of its longitudinal extent and/or if the spark gap is formed between surface regions of the ground electrode and of the centre electrode which extend parallel to the longitudinal axis and lie opposite one another.
A simple construction ensues if a male thread is formed in each case on the two concentrically disposed end shoulders of the end part and if a female thread, matched to the respective male thread, is formed in each case on the inner wall surface of the wall and/or on the inner wall surface of the ground electrode carrier and/or if the ground electrode carrier and the cylindrical ring-shaped wall are arranged concentrically to each other, forming the prespecified gap and possibly a height offset, and/or if the cylindrical wall and/or the ground electrode carrier is pushed on the respective end shoulder and fastened there by means of welding.
For the construction of the spark plug/ especially with regard to current conductivity and heat conductivity or heat dissipation, it is advantageous if a number of preferably parallel extending slots, extending parallel to the direction of the longitudinal axis of the spark plug, are formed in the wall, through which slots the ground electrodes are guided into the interior of the chamber, wherein the slots, if necessary, extend from the combustion chamber-side end face of the wall up to the level region of the end face of the end part.
If the ground electrodes are located outside the wall and project through the longitudinal slots into the chamber which is bounded by the wall, the ground electrodes have a screening effect and a certain desired circulation of the gas can be maintained between the ground electrodes and the adjacent slot surfaces, contributing to the cooling of the electrodes. As a
A simple construction ensues if a male thread is formed in each case on the two concentrically disposed end shoulders of the end part and if a female thread, matched to the respective male thread, is formed in each case on the inner wall surface of the wall and/or on the inner wall surface of the ground electrode carrier and/or if the ground electrode carrier and the cylindrical ring-shaped wall are arranged concentrically to each other, forming the prespecified gap and possibly a height offset, and/or if the cylindrical wall and/or the ground electrode carrier is pushed on the respective end shoulder and fastened there by means of welding.
For the construction of the spark plug/ especially with regard to current conductivity and heat conductivity or heat dissipation, it is advantageous if a number of preferably parallel extending slots, extending parallel to the direction of the longitudinal axis of the spark plug, are formed in the wall, through which slots the ground electrodes are guided into the interior of the chamber, wherein the slots, if necessary, extend from the combustion chamber-side end face of the wall up to the level region of the end face of the end part.
If the ground electrodes are located outside the wall and project through the longitudinal slots into the chamber which is bounded by the wall, the ground electrodes have a screening effect and a certain desired circulation of the gas can be maintained between the ground electrodes and the adjacent slot surfaces, contributing to the cooling of the electrodes. As a
6 result, an excessive accumulation of heat is avoided and spontaneous combustions are counteracted.
In the case of the spark plug according to the invention, it is a special embodiment of a screened spark plug.
It is advantageous for ignition and heat dissipation if a ignition surface carrier, which is preferably guided radially through the slot into the interior of the chamber, projects from the section which extends parallel to, and outside of, the wall and/or if a connecting piece, which preferably extends parallel to the direction of the longitudinal axis of the spark plug, follows the circumferential extent of the wall and partially closes off the slot or is at least partially arranged in the slot space, projects from the ignition surface carrier in the direction of the combustion chamber and, if applicable, terminates there in the same plane with the end face of the wall and/or if the section of the ground electrode which projects from the ground electrode carrier is located outside the circumferential region of the wall in front of the slot. As a result of this freeing of the wall, the wall can be cooled in a better way by means of the gas which is to be combusted.
In a preferred embodiment, it is provided that the centre electrode has a number of radially outwardly projecting, preferably centrally symmetrically formed, electrodes which in their respective end region have an ignition surface, opposite which in each case lies an ignition surface of a ground electrode. A
simplified production and exact ignition performance ensue if an encompassing annular groove, which adjoins the insulation-side end of the ignition surfaces of the centre electrode, is formed on this centre electrode.
An advantageous embodiment of the end part provides that the end part, which is seated upon the end region of the spark plug housing, is of a rotationally symmetrical, preferably cylindrical ring-shaped, design and is arranged centrally to the longitudinal axis of the spark plug and extends the spark plug housing on the combustion chamber side in form of an
In the case of the spark plug according to the invention, it is a special embodiment of a screened spark plug.
It is advantageous for ignition and heat dissipation if a ignition surface carrier, which is preferably guided radially through the slot into the interior of the chamber, projects from the section which extends parallel to, and outside of, the wall and/or if a connecting piece, which preferably extends parallel to the direction of the longitudinal axis of the spark plug, follows the circumferential extent of the wall and partially closes off the slot or is at least partially arranged in the slot space, projects from the ignition surface carrier in the direction of the combustion chamber and, if applicable, terminates there in the same plane with the end face of the wall and/or if the section of the ground electrode which projects from the ground electrode carrier is located outside the circumferential region of the wall in front of the slot. As a result of this freeing of the wall, the wall can be cooled in a better way by means of the gas which is to be combusted.
In a preferred embodiment, it is provided that the centre electrode has a number of radially outwardly projecting, preferably centrally symmetrically formed, electrodes which in their respective end region have an ignition surface, opposite which in each case lies an ignition surface of a ground electrode. A
simplified production and exact ignition performance ensue if an encompassing annular groove, which adjoins the insulation-side end of the ignition surfaces of the centre electrode, is formed on this centre electrode.
An advantageous embodiment of the end part provides that the end part, which is seated upon the end region of the spark plug housing, is of a rotationally symmetrical, preferably cylindrical ring-shaped, design and is arranged centrally to the longitudinal axis of the spark plug and extends the spark plug housing on the combustion chamber side in form of an
7 intermediate piece and/or that the end part, by its combustion chamber-side end region, encompasses the base section of the centre electrode.
A constructionally simpler and operationally more reliable construction ensues if the end part is connected to the spark plug housing by means of welding and/or screwing, and/or if the end part encompasses the base of the centre electrode and the insulating body, forming a gap.
Fig. 1 shows a schematic longitudinal section through an embodiment of a spark plug according to the invention. Figs. 2a and 2b shows embodiments of a centre electrode. Fig. 3 shows a perspective view of a spark plug according to the invention.
Fig. 4a shows a possible embodiment of a spark plug without an end part. Fig. 4b shows an embodiment of a spark plug with a seated attached end part. Fig. 4c shows a spark plug according to the invention with a seated end part which is constructed in one piece with the wall of the chamber, wherein the ground electrode carrier is welded on this end part.
Figs. 5 and 6 show embodiments of spark plugs in which the ground electrodes or the ground electrode carrier are, or is, located inside the wall on an end part or are connected to the end part in one piece. Figs. 7 to 9 show embodiments of spark plugs with an end part which is seated on the spark plug housing and with a prechamber encompassing electrodes.
Figs. 10 and 11 show a spark plug with an annular sleeve which is arranged between the end part and the prechamber.
In the following text, the invention is exemplarily explained in more detail with reference to the drawing.
Fig. 1 shows a spark plug for use in an internal combustion engine, especially for an Otto gas engine. A spark plug housing 2 is supported by an insulating body 1, wherein a centre electrode base 3a is enclosed by, or projects from, the insulating body 1. Seated on this centre electrode 3a base of the spark plug is the centre electrode 3 which has at least one
A constructionally simpler and operationally more reliable construction ensues if the end part is connected to the spark plug housing by means of welding and/or screwing, and/or if the end part encompasses the base of the centre electrode and the insulating body, forming a gap.
Fig. 1 shows a schematic longitudinal section through an embodiment of a spark plug according to the invention. Figs. 2a and 2b shows embodiments of a centre electrode. Fig. 3 shows a perspective view of a spark plug according to the invention.
Fig. 4a shows a possible embodiment of a spark plug without an end part. Fig. 4b shows an embodiment of a spark plug with a seated attached end part. Fig. 4c shows a spark plug according to the invention with a seated end part which is constructed in one piece with the wall of the chamber, wherein the ground electrode carrier is welded on this end part.
Figs. 5 and 6 show embodiments of spark plugs in which the ground electrodes or the ground electrode carrier are, or is, located inside the wall on an end part or are connected to the end part in one piece. Figs. 7 to 9 show embodiments of spark plugs with an end part which is seated on the spark plug housing and with a prechamber encompassing electrodes.
Figs. 10 and 11 show a spark plug with an annular sleeve which is arranged between the end part and the prechamber.
In the following text, the invention is exemplarily explained in more detail with reference to the drawing.
Fig. 1 shows a spark plug for use in an internal combustion engine, especially for an Otto gas engine. A spark plug housing 2 is supported by an insulating body 1, wherein a centre electrode base 3a is enclosed by, or projects from, the insulating body 1. Seated on this centre electrode 3a base of the spark plug is the centre electrode 3 which has at least one
8 ignition surface 12. The ignition surfaces 12 lie on discharging projections of the centre electrode 3.
For the forming of at least one spark gap 12, provision is made for at least one ground electrode 4 which is supported by a ground electrode carrier 6. The ground electrodes 4 are advantageously arranged on the ground electrode carrier 6 in a distributed manner around the centre electrode 3 at equal distances from each other. The ground electrode carrier 6 is supported on an end part 60, which is seated upon the spark plug housing 2, or is fastened on this end part.
As is apparent from Fig. 1, the ground electrodes 4 project in each case from the ground electrode carrier 6 in the form of a finger with a section 41 and are fastened, preferably welded, on the carrier 6. The ground electrode 4 and the carrier 6 can be constructed as a one-piece component, if applicable. The combustion chamber-side end region or the ignition surface 26 of the ground electrode 4 lie on an ignition surface carrier 51 and extend parallel to the longitudinal axis A of the spark plug or parallel to the facing ignition surface 12 of the centre electrode 3. The spark gap 13 is formed between the oppositely disposed ignition surfaces 26, 12 of the ground electrode 4 and of the centre electrode 3. These ignition surfaces 26, 12 can preferably be coated with noble metal or noble metal alloys in the form of strips or small plates.
For the fastening of the ground electrode carrier 6 on the end part 60, it is provided that the end part 60 has two concentrically lying, cylindrical end shoulders 17, 18, of which the inner end shoulder 17 projects beyond the outer end shoulder 18 in the direction of the combustion chamber. The ground electrode carrier 6 is seated, pushed or screwed on the outer end shoulder 18 and/or, if applicable, fastened by means of welding, especially spot welding or seam welding, and a wall 8, which forms a chamber 5 which is open on the combustion chamber side, is seated, pushed or screwed on the inner end shoulder 17 and/or, if applicable, fastened by means of welding, especially
For the forming of at least one spark gap 12, provision is made for at least one ground electrode 4 which is supported by a ground electrode carrier 6. The ground electrodes 4 are advantageously arranged on the ground electrode carrier 6 in a distributed manner around the centre electrode 3 at equal distances from each other. The ground electrode carrier 6 is supported on an end part 60, which is seated upon the spark plug housing 2, or is fastened on this end part.
As is apparent from Fig. 1, the ground electrodes 4 project in each case from the ground electrode carrier 6 in the form of a finger with a section 41 and are fastened, preferably welded, on the carrier 6. The ground electrode 4 and the carrier 6 can be constructed as a one-piece component, if applicable. The combustion chamber-side end region or the ignition surface 26 of the ground electrode 4 lie on an ignition surface carrier 51 and extend parallel to the longitudinal axis A of the spark plug or parallel to the facing ignition surface 12 of the centre electrode 3. The spark gap 13 is formed between the oppositely disposed ignition surfaces 26, 12 of the ground electrode 4 and of the centre electrode 3. These ignition surfaces 26, 12 can preferably be coated with noble metal or noble metal alloys in the form of strips or small plates.
For the fastening of the ground electrode carrier 6 on the end part 60, it is provided that the end part 60 has two concentrically lying, cylindrical end shoulders 17, 18, of which the inner end shoulder 17 projects beyond the outer end shoulder 18 in the direction of the combustion chamber. The ground electrode carrier 6 is seated, pushed or screwed on the outer end shoulder 18 and/or, if applicable, fastened by means of welding, especially spot welding or seam welding, and a wall 8, which forms a chamber 5 which is open on the combustion chamber side, is seated, pushed or screwed on the inner end shoulder 17 and/or, if applicable, fastened by means of welding, especially
9 spot welding or seam welding. The internal dimensions of the wall 8 and of the ground electrode carrier 6 are matched to the respective external dimensions of the end shoulders 17, 18. The wall 8 forms a screen or shield or an open chamber and the spark plug according to the invention can also be referred to as a screened spark plug.
The ground electrode carrier 6, and especially also the section 41, of each of the ground electrodes 4 which project from the ground electrode carrier 6 are arranged at a distance from the outer surface 7 of the wall 8 of the chamber 5, possibly offset downwards in the direction of the spark plug housing 2 in relation to the centre electrode 3. This distance is provided in order to ensure a defined or uninfluenced current flow in the ground electrode carrier 6.
Furthermore, as a result of the distance 21, as already explained above, a distinct or defined heat dissipation from the ground electrodes 4 to the spark plug housing 2 is made possible.
Shown in Fig. 1 is a spark plug with a cylindrical ring-like wall 8 which circumferentially encompasses the centre electrode 3. Variations of the shape of such walls or chambers can also be provided.
A simple construction and a simple production of the parts ensue if the wall 8 of the swirl chamber 5, which is open on the combustion chamber side, and the ground electrode carrier 6 have, at least in sections, a circular cross section, or are formed in each case by a cylindrical ring.
Through-openings 10 can be formed in the wall 8 for passage of the gas.
Each finger-like ground electrode 4 is advantageously offset from the ground electrode carrier 6 towards the centre electrode 3 in the form of an ignition surface carrier 51, forming a section 41 extending parallel to the wall 8, and terminates in front of the centre electrode 3. To this end, slots 50 are formed in the wall 8. The width of these slots 50 basically corresponds to the width of the section 41 or slightly exceeds this width.
These slots 50 basically extend over the entire height of the wall 8, that is to say they extend especially from a region of the wall 8 which lies approximately at the level of the end face of the end part 60 and terminate on 5 the combustion chamber-side end face of the wall 8. The offset radially extending ignition surface carrier 51 of the ground electrode 4 extends through this slot 50 in the direction of the centre electrode 3. A
connecting piece 52, which extends parallel to, or in the direction of, the longitudinal axis A of
The ground electrode carrier 6, and especially also the section 41, of each of the ground electrodes 4 which project from the ground electrode carrier 6 are arranged at a distance from the outer surface 7 of the wall 8 of the chamber 5, possibly offset downwards in the direction of the spark plug housing 2 in relation to the centre electrode 3. This distance is provided in order to ensure a defined or uninfluenced current flow in the ground electrode carrier 6.
Furthermore, as a result of the distance 21, as already explained above, a distinct or defined heat dissipation from the ground electrodes 4 to the spark plug housing 2 is made possible.
Shown in Fig. 1 is a spark plug with a cylindrical ring-like wall 8 which circumferentially encompasses the centre electrode 3. Variations of the shape of such walls or chambers can also be provided.
A simple construction and a simple production of the parts ensue if the wall 8 of the swirl chamber 5, which is open on the combustion chamber side, and the ground electrode carrier 6 have, at least in sections, a circular cross section, or are formed in each case by a cylindrical ring.
Through-openings 10 can be formed in the wall 8 for passage of the gas.
Each finger-like ground electrode 4 is advantageously offset from the ground electrode carrier 6 towards the centre electrode 3 in the form of an ignition surface carrier 51, forming a section 41 extending parallel to the wall 8, and terminates in front of the centre electrode 3. To this end, slots 50 are formed in the wall 8. The width of these slots 50 basically corresponds to the width of the section 41 or slightly exceeds this width.
These slots 50 basically extend over the entire height of the wall 8, that is to say they extend especially from a region of the wall 8 which lies approximately at the level of the end face of the end part 60 and terminate on 5 the combustion chamber-side end face of the wall 8. The offset radially extending ignition surface carrier 51 of the ground electrode 4 extends through this slot 50 in the direction of the centre electrode 3. A
connecting piece 52, which extends parallel to, or in the direction of, the longitudinal axis A of
10 the spark plug, adjoins the ignition surface carrier 51 which extends from the section 41 radially through the slot 50 into the interior of the chamber 5. The connecting piece 52 follows the circumferential extent of the wall 8 and in this region at least partially closes off the slot 50 or lies preferably inside the slot 50. This connecting piece 52 projects from the ignition surface carrier 51 in the direction of the combustion chamber and terminates with the end face of the wall 8 and contributes to controlled gas circulation.
As is apparent from Figs. 2 and 3, the centre electrode 3 has three centrally symmetrically arranged ignition surfaces 12, opposite which in each case lies an ignition surface 26 of a ground electrode 4.
Adjacent strips 40 consisting of a noble metal alloy can be applied to or fused onto the radially outwardly pointing surface regions 12 of the centre electrode 2 and/or onto the surfaces 26 of the respectively opposite ground electrodes 4 which face the centre electrode 3.
Instead of directly applied or fused on noble metal alloy strips 40 according to Fig. 2a, the noble metal alloy can also be applied to or welded onto or fused onto projecting regions 48 of the cylindrical part of the centre electrode 3 in the form of small noble metal plates 40', which regions 48 are formed by projections which are welded on or moulded on in one piece.
Such raised regions 48 can also be formed on or attached to the ground electrodes 4 and to which, or onto which, noble metal alloy, possibly in the form of small
As is apparent from Figs. 2 and 3, the centre electrode 3 has three centrally symmetrically arranged ignition surfaces 12, opposite which in each case lies an ignition surface 26 of a ground electrode 4.
Adjacent strips 40 consisting of a noble metal alloy can be applied to or fused onto the radially outwardly pointing surface regions 12 of the centre electrode 2 and/or onto the surfaces 26 of the respectively opposite ground electrodes 4 which face the centre electrode 3.
Instead of directly applied or fused on noble metal alloy strips 40 according to Fig. 2a, the noble metal alloy can also be applied to or welded onto or fused onto projecting regions 48 of the cylindrical part of the centre electrode 3 in the form of small noble metal plates 40', which regions 48 are formed by projections which are welded on or moulded on in one piece.
Such raised regions 48 can also be formed on or attached to the ground electrodes 4 and to which, or onto which, noble metal alloy, possibly in the form of small
11 noble metal plates, is applied, or welded or fused. On the side of the ignition surfaces 12 which is remote from the combustion chamber or directly beneath the projections 48 of the centre electrode 3, an encompassing annular groove 61 can be formed.
This annular groove 61 represents a defined boundary of the ignition surfaces 12 and makes the welding on and application of small noble metal plates and/or strips 40, 40' easier.
The wall 8 of the chamber 5 and/or the ground electrodes 4 and/or the ground electrode carrier 6 are manufactured from nickel-based alloy and/or high-temperature high-grade steel and/or hot corrosion resistant metal alloys with good thermal conductivity. The wall 8 can also be manufactured from brass.
For the production and the operation of the spark plugs, it has proved to be advantageous if the number of ground electrodes 4 is uneven or if the ground electrodes 4 do not lie opposite each other with regard to the centre axis of the centre electrode 3. As a result, the application of noble metal alloys upon the ground electrodes 4 which project from the carrier 6 becomes possible in a simple manner.
The slot 50 which is provided makes necessary maintenance operations or readjustments easier.
The ground electrode carrier 6 and the wall 8 of the chamber 5 are connected in an electrically conducting manner to the spark plug housing 2. The centre electrode 3 is connected to the centre electrode base 3a of the spark plug, preferably by means of welding. The centre electrode base 3a is guided in the insulating body 1 and is electrically insulated towards the spark plug housing 2 by means of the insulating body 1.
The ground electrodes 4 are designed in such a way that the section 41 extends basically in a straight line and parallel to the wall 8 without deflection and preferably has a constant cross-sectional shape over this longitudinal extent. The transition from the ground electrode carrier 6 to the section 41 can extend in a rounded manner.
This annular groove 61 represents a defined boundary of the ignition surfaces 12 and makes the welding on and application of small noble metal plates and/or strips 40, 40' easier.
The wall 8 of the chamber 5 and/or the ground electrodes 4 and/or the ground electrode carrier 6 are manufactured from nickel-based alloy and/or high-temperature high-grade steel and/or hot corrosion resistant metal alloys with good thermal conductivity. The wall 8 can also be manufactured from brass.
For the production and the operation of the spark plugs, it has proved to be advantageous if the number of ground electrodes 4 is uneven or if the ground electrodes 4 do not lie opposite each other with regard to the centre axis of the centre electrode 3. As a result, the application of noble metal alloys upon the ground electrodes 4 which project from the carrier 6 becomes possible in a simple manner.
The slot 50 which is provided makes necessary maintenance operations or readjustments easier.
The ground electrode carrier 6 and the wall 8 of the chamber 5 are connected in an electrically conducting manner to the spark plug housing 2. The centre electrode 3 is connected to the centre electrode base 3a of the spark plug, preferably by means of welding. The centre electrode base 3a is guided in the insulating body 1 and is electrically insulated towards the spark plug housing 2 by means of the insulating body 1.
The ground electrodes 4 are designed in such a way that the section 41 extends basically in a straight line and parallel to the wall 8 without deflection and preferably has a constant cross-sectional shape over this longitudinal extent. The transition from the ground electrode carrier 6 to the section 41 can extend in a rounded manner.
12 Shown in Fig. 4a is a known spark plug. The length of the spark plug housing 2 is represented by L, wherein on the combustion chamber-side end region of the spark plug 2 the ground electrode carrier 6 and the wall 8 are mounted, or fastened, especially by means of welding, on corresponding shoulders 17, 18 of the spark plug housing 2. In the case of the spark plug according to the invention according to Fig. 4b, the end part 60, in the form of an intermediate ring, is seated, for example pushed or screwed and, if applicable, fastened by means of spot welding or seam welding, on the combustion chamber-side end region of the spark plug housing 2. This end part 60 serves for extending the spark plug housing 2. This end part 60 supports a shoulder 18 on which the ground electrode carrier 6 is fastened and/or welded and furthermore supports a shoulder 17 which supports the wall 8. Resulting from this, therefore, is a length Li of the spark plug housing 2 and seated end part 60 which is greater that the length L. As a result, the parts which are required for the ignition, specifically the ground electrode 4 and the wall 8, can be of shorter design and the distance B between the wall 8 and the stem or section 41 of the ground electrode can be of longer design. As a result, heat dissipation and ignition reliability are improved.
In the case of the embodiment of the spark plug according to Fig. 4c, the wall 8 is formed in one piece with the end part 60, which is fastened on the combustion chamber-side end region of the spark plug housing 2. A shoulder 64, on which the end part 60 is seated, screwed and, if applicable, fastened by means of seam welding or spot welding, can be formed on the spark plug housing. The ground electrode carrier 6 is seated, especially welded, on the end part 60. The ground electrode carrier 6 can be seated on a shoulder 18 of the end part 60 and fastened there by means of welding.
The dark arrows, which are directed towards the longitudinal axis A of the spark plug, represent possible weld seams or weld spots with which the end part 60 and/or the ground
In the case of the embodiment of the spark plug according to Fig. 4c, the wall 8 is formed in one piece with the end part 60, which is fastened on the combustion chamber-side end region of the spark plug housing 2. A shoulder 64, on which the end part 60 is seated, screwed and, if applicable, fastened by means of seam welding or spot welding, can be formed on the spark plug housing. The ground electrode carrier 6 is seated, especially welded, on the end part 60. The ground electrode carrier 6 can be seated on a shoulder 18 of the end part 60 and fastened there by means of welding.
The dark arrows, which are directed towards the longitudinal axis A of the spark plug, represent possible weld seams or weld spots with which the end part 60 and/or the ground
13 electrode carrier 6 and/or the wall 8 can be welded to the respective components which support them.
The spark plug which is shown in Figs. 5 and 6 basically has the same construction as the spark plugs which are shown in the other figures except for the modification that the ground electrodes 4 or the ground electrode carrier 6 are to be located inside the wall 8, in fact at a distance from the inner surface 19 of the wall 8 in the direction of the centre electrode 3. A
spark plug housing 2 is supported by the insulating body 1, wherein a centre electrode base 3a, upon which the centre electrode 3 is seated, projects from the insulating body 1. The ground electrodes 4, which are arranged around the centre electrode 3, are supported by a ground electrode carrier 6 which is seated on an end shoulder 17 of the end part 60 and, if applicable, is fastened thereto by means of welding. The wall 8 is seated on a further shoulder 18 and, if applicable, is fastened by means of welding. The ground electrode carrier 6 and the ground electrodes 4 lie at a distance D away from the inner surface 19 of the wall 8. As a result, a current-wise and heat dissipation-wise separation of the ground electrodes 4 from the wall 8 ensues and the heat can be satisfactorily dissipated via the end part 60 or an exact and reliable current conduction can be carried out via the end part 60.
As shown in Fig. 6, the ground electrodes 4 can also project from a ground electrode carrier 6 which is formed in one piece with the end part 60. In this case, the wall 8 is seated upon the end part 60 upon the shoulder 18 and, if necessary, fastened there by means of welding. Also in the case of this embodiment, an electrode arrangement of shorter construction is achieved, with which the conduction of heat and current is favourably influenced.
Also in this case, the end part 60 encompasses the combustion chamber-side end region of the insulating body 1 and/or the base part of the electrode 3 which is remote from the combustion chamber. As a result of the one-piece design of the end part 60 and the ground electrode carrier
The spark plug which is shown in Figs. 5 and 6 basically has the same construction as the spark plugs which are shown in the other figures except for the modification that the ground electrodes 4 or the ground electrode carrier 6 are to be located inside the wall 8, in fact at a distance from the inner surface 19 of the wall 8 in the direction of the centre electrode 3. A
spark plug housing 2 is supported by the insulating body 1, wherein a centre electrode base 3a, upon which the centre electrode 3 is seated, projects from the insulating body 1. The ground electrodes 4, which are arranged around the centre electrode 3, are supported by a ground electrode carrier 6 which is seated on an end shoulder 17 of the end part 60 and, if applicable, is fastened thereto by means of welding. The wall 8 is seated on a further shoulder 18 and, if applicable, is fastened by means of welding. The ground electrode carrier 6 and the ground electrodes 4 lie at a distance D away from the inner surface 19 of the wall 8. As a result, a current-wise and heat dissipation-wise separation of the ground electrodes 4 from the wall 8 ensues and the heat can be satisfactorily dissipated via the end part 60 or an exact and reliable current conduction can be carried out via the end part 60.
As shown in Fig. 6, the ground electrodes 4 can also project from a ground electrode carrier 6 which is formed in one piece with the end part 60. In this case, the wall 8 is seated upon the end part 60 upon the shoulder 18 and, if necessary, fastened there by means of welding. Also in the case of this embodiment, an electrode arrangement of shorter construction is achieved, with which the conduction of heat and current is favourably influenced.
Also in this case, the end part 60 encompasses the combustion chamber-side end region of the insulating body 1 and/or the base part of the electrode 3 which is remote from the combustion chamber. As a result of the one-piece design of the end part 60 and the ground electrode carrier
14 6, or with the ground electrodes 4, a simplified production of the spark plug ensues since only the wall 8 needs to be seated on and, if applicable, welded onto the one-piece component which is formed by the ground electrodes 4 and the end part 60.
It is also possible to provide other types of fastening for the end part 60 on the spark plug housing 2 or for the wall 8 and/or the ground electrode carrier on the end part 60 and/or on the spark plug housing 2, for example by pressing. In any case, the end part 60 is not seated upon the tapering insulating body.
The parts are necessarily spaced apart for insulation reasons.
The end part 60 encompasses the end region of the insulating body 1 at a distance.
By one piece, it is primarily to be understood that the respective component, or components, does not have, or do not have, a welded or soldered connection and is, or are, formed from the same material, or exists, or exist, as a single non-assembled part or is, or are, formed from the same component.
Spark plugs with open chambers 5 are shown in Figs. 1 to 6.
Spark plugs with prechambers 5' are shown in Figs. 7 to 9. The number of through-openings 10 which are formed in the chambers 5 and prechambers 5' and their shape or position, is selectable or is determined by the application of the spark plug.
Shown in Fig. 7 is an embodiment of a spark plug according to the invention, in which the ground electrode carrier 6, as in Fig. 6, is formed in one piece with the end part 60. The end face of the end part 60 which is remote from the combustion chamber is seated on a shoulder 61 of the spark plug housing 2.
In particular, this region of the end part 60, as represented by 55 in Fig. 8, can be welded to the spark plug housing 2. On its outer circumference the spark plug housing 2 carries a thread 51 by means of which is can be screwed into an engine block. It is provided that the end part 60 has an annular shape and by the inner surface of its end region which is remote from the combustion chamber and/or by its end face which is remote from the combustion chamber is connected to the spark plug housing 2 or is seated upon this, preferably upon a shoulder 61.
Furthermore, it can be provided that the end region of the end part 60 which is remote from the combustion chamber externally encompasses an end region 64 of the spark plug housing 2 which 5 is close to the combustion chamber, or is connected to its outer wall surface, forming a gap 56, if necessary. The annular gap 56 can be formed between the end region 56 of the spark plug housing 2 and the end region of the end part which is remote from the combustion chamber.
10 The insulating body 1, which encompasses the centre electrode base 3a and supports the electrode arrangement 3 or the individual electrodes of the centre electrode 3, is inserted into the spark plug housing 2 using a seal 52.
The end part 60, by means of a shoulder 58, supports the
It is also possible to provide other types of fastening for the end part 60 on the spark plug housing 2 or for the wall 8 and/or the ground electrode carrier on the end part 60 and/or on the spark plug housing 2, for example by pressing. In any case, the end part 60 is not seated upon the tapering insulating body.
The parts are necessarily spaced apart for insulation reasons.
The end part 60 encompasses the end region of the insulating body 1 at a distance.
By one piece, it is primarily to be understood that the respective component, or components, does not have, or do not have, a welded or soldered connection and is, or are, formed from the same material, or exists, or exist, as a single non-assembled part or is, or are, formed from the same component.
Spark plugs with open chambers 5 are shown in Figs. 1 to 6.
Spark plugs with prechambers 5' are shown in Figs. 7 to 9. The number of through-openings 10 which are formed in the chambers 5 and prechambers 5' and their shape or position, is selectable or is determined by the application of the spark plug.
Shown in Fig. 7 is an embodiment of a spark plug according to the invention, in which the ground electrode carrier 6, as in Fig. 6, is formed in one piece with the end part 60. The end face of the end part 60 which is remote from the combustion chamber is seated on a shoulder 61 of the spark plug housing 2.
In particular, this region of the end part 60, as represented by 55 in Fig. 8, can be welded to the spark plug housing 2. On its outer circumference the spark plug housing 2 carries a thread 51 by means of which is can be screwed into an engine block. It is provided that the end part 60 has an annular shape and by the inner surface of its end region which is remote from the combustion chamber and/or by its end face which is remote from the combustion chamber is connected to the spark plug housing 2 or is seated upon this, preferably upon a shoulder 61.
Furthermore, it can be provided that the end region of the end part 60 which is remote from the combustion chamber externally encompasses an end region 64 of the spark plug housing 2 which 5 is close to the combustion chamber, or is connected to its outer wall surface, forming a gap 56, if necessary. The annular gap 56 can be formed between the end region 56 of the spark plug housing 2 and the end region of the end part which is remote from the combustion chamber.
10 The insulating body 1, which encompasses the centre electrode base 3a and supports the electrode arrangement 3 or the individual electrodes of the centre electrode 3, is inserted into the spark plug housing 2 using a seal 52.
The end part 60, by means of a shoulder 58, supports the
15 wall 8 of a prechamber 5' which covers the electrodes, i.e. the centre electrode 3 and the ground electrodes 4 and also the ground electrode carrier 6.
Corresponding through-openings 10 are formed in the prechamber 5'.
A gap 53 is recessed in each case between the ground electrodes 6 which project from the end part 60 and the inner surface of the wall 8 so that the current distribution and heat dissipation are defined.
It is furthermore provided that the ground electrode carriers 6 project from the end part 60 in the region, or at the level, in which or at which the end face of the wall 8 which is remote from the combustion chamber is connected to the end part 60 or at which the shoulder 58 lies.
The centre electrode 3 is designed in such a way that the combustion chamber-side end of the centre electrode 3 terminates with the end of the centre electrode base 3a or does not project beyond the combustion chamber-side end of the centre electrode base 3a or that the electrodes 4 and/or ignition plates 24 which are supported by the centre electrode 3 and/or the electrodes 4 and/or ignition plates 24 which are supported by the ground electrodes 6 do not project beyond the combustion chamber-side
Corresponding through-openings 10 are formed in the prechamber 5'.
A gap 53 is recessed in each case between the ground electrodes 6 which project from the end part 60 and the inner surface of the wall 8 so that the current distribution and heat dissipation are defined.
It is furthermore provided that the ground electrode carriers 6 project from the end part 60 in the region, or at the level, in which or at which the end face of the wall 8 which is remote from the combustion chamber is connected to the end part 60 or at which the shoulder 58 lies.
The centre electrode 3 is designed in such a way that the combustion chamber-side end of the centre electrode 3 terminates with the end of the centre electrode base 3a or does not project beyond the combustion chamber-side end of the centre electrode base 3a or that the electrodes 4 and/or ignition plates 24 which are supported by the centre electrode 3 and/or the electrodes 4 and/or ignition plates 24 which are supported by the ground electrodes 6 do not project beyond the combustion chamber-side
16 end of the centre electrode base 3a on the combustion chamber side. As a result, a short, compact design of the electrodes is achieved, with which the heat transfers and current distribution are advantageously influenced.
Shown in an embodiment of a prechamber spark plug according to Fig. 8 are weld seams 55 which are to be advantageously applied and with which the spark plug housing 2 can be connected to the end part 60 or with which the end part 60 can be connected to the wall 8 of the prechamber 5'. Such weld seams 55 can also be used in order to connect the centre electrode 3 to the centre electrode base 3a.
In principle, the gap 53 could even be omitted or the inner surface of the wall 8 could bear against the outwardly orientated surface of the ground electrode carrier 6 or be connected to this. The forming of a gap 53, however, brings defined heat and current conditions.
Shown in Fig. 9 is a prechamber spark plug in which the chamber 5' has a different shape from the chamber 5' of the spark plugs according to Figs. 7 and 8. In comparison to Fig.
8, the electrode arrangement 3 does not additionally project beyond the electrode base 3a on the combustion chamber side, as is the case with the spark plug according to Fig. 8. It is apparent in the case of the spark plug according to Fig. 8 that the end part 60 has a greater height than the end part 60 of the spark plugs which are shown in Figs. 7 and 9. In Fig. 8, the centre electrode 3 projects beyond the centre electrode base 3a so that the result is a higher electrode construction or a higher construction of the end part 60 with the ground electrode carriers 6 which are supported by it.
Figs. 10 and 11 show a spark plug in which the spark plug housing 2 is extended on the combustion chamber side by a sleeve 70 which supports the prechamber 5'.
Fig. 10 shows a spark plug in which the prechamber 5' is not supported directly by the spark plug housing 2 but supported indirectly by using, or applying, an intermediate piece 70.
Shown in an embodiment of a prechamber spark plug according to Fig. 8 are weld seams 55 which are to be advantageously applied and with which the spark plug housing 2 can be connected to the end part 60 or with which the end part 60 can be connected to the wall 8 of the prechamber 5'. Such weld seams 55 can also be used in order to connect the centre electrode 3 to the centre electrode base 3a.
In principle, the gap 53 could even be omitted or the inner surface of the wall 8 could bear against the outwardly orientated surface of the ground electrode carrier 6 or be connected to this. The forming of a gap 53, however, brings defined heat and current conditions.
Shown in Fig. 9 is a prechamber spark plug in which the chamber 5' has a different shape from the chamber 5' of the spark plugs according to Figs. 7 and 8. In comparison to Fig.
8, the electrode arrangement 3 does not additionally project beyond the electrode base 3a on the combustion chamber side, as is the case with the spark plug according to Fig. 8. It is apparent in the case of the spark plug according to Fig. 8 that the end part 60 has a greater height than the end part 60 of the spark plugs which are shown in Figs. 7 and 9. In Fig. 8, the centre electrode 3 projects beyond the centre electrode base 3a so that the result is a higher electrode construction or a higher construction of the end part 60 with the ground electrode carriers 6 which are supported by it.
Figs. 10 and 11 show a spark plug in which the spark plug housing 2 is extended on the combustion chamber side by a sleeve 70 which supports the prechamber 5'.
Fig. 10 shows a spark plug in which the prechamber 5' is not supported directly by the spark plug housing 2 but supported indirectly by using, or applying, an intermediate piece 70.
17 This intermediate piece 70 is connected to the outer wall of the spark plug housing 2, or is supported by this, and the combustion chamber-side end region of the intermediate piece 70 supports the prechamber 5', or is connected to the wall 8 of the prechamber 5', for example by means of welding.
For the production of such a spark plug, a thread, which possibly exists on the spark plug housing 2, can be turned out and the cylindrical intermediate piece can be fitted onto the thereby prepared spark plug housing 2 and be fastened by means of welding, especially spot welding or laser welding. As is apparent from Figs. 10 and 11, it is provided that the combustion chamber-side end region of the intermediate piece 70 encompasses the electrodes of the spark plug or the centre electrode base 3a and also the insulating body 1. It is advantageous in this case if a gap 53 is recessed between the intermediate piece 70 and the ground electrode carrier 6 in order to realise the heat dissipation and the current flow in a defined manner. The seating of the intermediate piece 70 upon the spark plug housing 2 is carried out after installing the electrodes on the centre electrode base 3a and after installing the end part 60 together with the ground electrode carrier 6 on the spark plug housing 2.
The thread 51 which is formed on the outer wall surface of the intermediate piece 70 is designed in such a way that the spark plug can be screwed into an engine block.
The intermediate piece 70 can be seated upon a shoulder 71 of the spark plug housing 2 or located upon this. To this end, a shoulder base 72 is formed on the intermediate piece 70 and can also serve as a carrier for a sealing ring 74 which is provided if necessary. A seal 52 is provided between the spark plug housing 2 and the insulating body 1. Furthermore, seating of the insulating body or of the spark plug housing 2, or the connecting of these two components, is carried out via a socket component 73.
For the production of such a spark plug, a thread, which possibly exists on the spark plug housing 2, can be turned out and the cylindrical intermediate piece can be fitted onto the thereby prepared spark plug housing 2 and be fastened by means of welding, especially spot welding or laser welding. As is apparent from Figs. 10 and 11, it is provided that the combustion chamber-side end region of the intermediate piece 70 encompasses the electrodes of the spark plug or the centre electrode base 3a and also the insulating body 1. It is advantageous in this case if a gap 53 is recessed between the intermediate piece 70 and the ground electrode carrier 6 in order to realise the heat dissipation and the current flow in a defined manner. The seating of the intermediate piece 70 upon the spark plug housing 2 is carried out after installing the electrodes on the centre electrode base 3a and after installing the end part 60 together with the ground electrode carrier 6 on the spark plug housing 2.
The thread 51 which is formed on the outer wall surface of the intermediate piece 70 is designed in such a way that the spark plug can be screwed into an engine block.
The intermediate piece 70 can be seated upon a shoulder 71 of the spark plug housing 2 or located upon this. To this end, a shoulder base 72 is formed on the intermediate piece 70 and can also serve as a carrier for a sealing ring 74 which is provided if necessary. A seal 52 is provided between the spark plug housing 2 and the insulating body 1. Furthermore, seating of the insulating body or of the spark plug housing 2, or the connecting of these two components, is carried out via a socket component 73.
18 The prechamber 5' does not project beyond the intermediate piece 70, as seen radially to .the longitudinal axis of the spark plug.
Furthermore, the wall 8 of the prechamber 5' is advantageously free of a thread.
Furthermore, the wall 8 of the prechamber 5' is advantageously free of a thread.
Claims (36)
1. Spark plug of an internal combustion engine, preferably for Otto gas engines, having a spark plug housing (2), which encompasses an insulating body (1), and also a centre electrode (3) and at least one ground electrode (4) which is supported by a ground electrode carrier (6), wherein the ignition surfaces (12) of the centre electrode (3) and the ignition surface (26) of the ground electrode (4) are encompassed by a wall (8) which forms a chamber (5) which is open on the combustion chamber side, or a prechamber (5') which has through-openings (10), characterized in that an end part (60) is seated on the combustion chamber-side end region of the spark plug housing (2) and in that the ground electrode carrier (6) and the wall (8) are supported by this end part (60).
2. Spark plug according to Claim 1, characterized in that - the ground electrode carrier (6), as seen perpendicularly to the longitudinal axis (A) of the spark plug (2), has a smaller distance from the centre electrode (3) than the inner surface (19) of the wall (8) of the chamber (5) or of the prechamber (5') and supports at least one finger-like ground electrode (4) with an ignition surface (26) which lies preferably at the height level of the ignition surface (12) of the centre electrode (3) in the chamber (5) or in the prechamber, or in that the ground electrode carrier (6), as seen perpendicularly to the longitudinal axis (A) of the spark plug (2), has a greater distance from the centre electrode (3) than the outer surface (7) of the wall (8) of the chamber (5) or of the prechamber (5') and supports at least one finger-like ground electrode (4) which extends through a recess (50) in the wall (8) into the chamber (5) or into the prechamber, wherein the ignition surface (26) of the ground electrode (4) lies preferably at the height level of the ignition surface (12) of the centre electrode (3) in the chamber (5) or in the prechamber (5' ).
3. Spark plug according to Claim 1 or 2, characterized in that two concentrically disposed cylindrical end shoulders (17, 18) are formed on the end part (60), of which the inner end shoulder (17), if applicable, possibly projects beyond the outer end shoulder (18) in the direction of the combustion chamber, wherein the ground electrode carrier (6), with the ground electrodes (4) which penetrate the wall (8), is seated, pushed or screwed on the outer end shoulder (18) and/or fastened by means of spot welding or seam welding, as applicable, and the wall (8) of the chamber (5) or of the prechamber (5') is seated, pushed or screwed on the inner end shoulder (17) and/or fastened by means of spot welding or seam welding, as applicable, or wherein the wall (8) of the chamber (5) or of the prechamber (5') is seated, pushed or screwed on the outer end shoulder (18) and/or fastened by means of spot welding or seam welding, as applicable, and the ground electrode carrier (6), which lies at a distance from the inner surface (19) of the wall (8), is seated, pushed or screwed on the inner end shoulder (17) and/or fastened by means of spot welding or seam welding, as applicable.
4. Spark plug according to one of Claims 1 to 3, characterized in that the end part (60) is formed in one piece with the wall (8), wherein the ground electrode carrier (6), which is located outside the wall (8), is seated, pushed or screwed onto the end part (6) and/or fastened by means of spot welding or seam welding, as applicable, or in that the end part (60) is formed in one piece with the ground electrode carrier (6), wherein the wall (8) which encompasses the ground electrode carrier (6) at a distance is seated, pushed or screwed onto the end part (60) and/or fastened by means of spot welding or seam welding, as applicable.
5. Spark plug according to one of Claims 1 to 4, characterized in that the base of the wall (8), which lies close to the spark plug housing (2) and is penetrated by the ground electrodes (4), lies closer to the combustion chamber-side end of the spark plug than the ground electrode carrier (6), or in that the base of the ground electrode carrier (6) which faces the spark plug housing (2) lies further from the combustion chamber-side end of the spark plug than the base of the wall (8) which encompasses the ground electrode carrier (6).
6. Spark plug according to one of Claims 1 to 5, characterized in that the ground electrode carrier (6) and/or the wall (8), as seen in section perpendicularly to the longitudinal axis (A) of the spark plug, has, or have, an at least partially circular cross section or is, or are, formed by a cylindrical ring.
7. Spark plug according to one of Claims 1 to 6, characterized in that the at least one ground electrode (4) and the ground electrode carrier (6) are formed in one piece or are interconnected by means of welding.
8. Spark plug according to one of Claims 1 to 7, characterized in that through-openings (10) are formed in the wall (8) for passage of the combustible gas.
9. Spark plug according to one of Claims 1 to 8, characterised in that the ground electrode carrier (6) supports one, three or five ground electrodes (4) and/or in that the ground electrodes (4) are arranged on the ground electrode carrier (6) in a distributed manner around the centre electrode (3) at equal distances from each other and/or in that each of the ground electrodes (4) which project from the ground electrode carrier (6) has in one section (41) a rectangular cross section or cylindrical ring segment-like cross section, at least in sub-sections of its longitudinal extent.
10. Spark plug according to one of Claims 1 to 9, characterized in that the spark gap (13) is formed between surface regions of the ground electrode (4) and of the centre electrode (3) which extend parallel to the longitudinal axis (A), are disposed opposite one another, form the ignition surfaces (12, 26) and, if applicable, have a noble metal or noble metal alloy coating.
11. Spark plug according to one of Claims 1 to 10, characterized in that a male thread is formed in each case on the two concentrically disposed end shoulders (17, 18) of the end part (60) and a female thread, which is matched to the respective male thread, is formed in each case on the inner wall surface (19) of the wall (8) and on the inner wall surface (20) of the ground electrode carrier (6) and/or in that the ground electrode carrier (6) and the wall (8) are arranged concentrically to each other, forming a prespecified radial gap (21) and possibly a height offset and/or in that the wall (8) and/or the ground electrode carrier (6) is pushed on the respective end shoulder (17, 18) and fastened there by means of welding.
12. Spark plug according to one of Claims 1 to 11, characterized in that a number of slots (50), which extend parallel to the direction of the longitudinal axis (A) of the spark plug, are formed in the wall (8), through which slots the ground electrodes (4) are guided into the interior of the chamber (5) or of the prechamber (5'), wherein the slots (50), if applicable, extend from the combustion chamber-side end face of the wall (8) up to the level region of the end face of the end section (17) or up to the end face level of the end part (60).
13. Spark plug according to one of Claims 1 to 12, characterized in that the section (41) of the respective ground electrode (4) which projects from the ground electrode carrier (6) is located outside the circumferential region of the wall (8) in the region which lies in front of the respective slot (50) and/or is orientated parallel to the longitudinal axis (A) of the spark plug.
14. Spark plug according to one of Claims 1 to 13, characterized in that an ignition surface carrier (51), which leads preferably radially through the slot (50) into the interior of the chamber (5) and supports welded on or fused on small noble metal plates or small noble metal alloy plates, projects from the section (41) of the ground electrode (4) which extends preferably parallel to, and outside of, the wall (8).
15. Spark plug according to one of Claims 1 to 14, characterized in that a connecting piece (52), which preferably extends parallel to the direction of the longitudinal axis (A), follows the circumferential extent of the wall (8) and partially closes off the slot (50) or at least partially extends in the slot (50), projects from the section (41), especially from the ignition surface carrier (51), in the direction of the combustion chamber and, if applicable, terminates in the same plane with the end face of the wall (8).
16. Spark plug according to one of Claims 1 to 15, characterized in that the centre electrode (3) has a number of radially outwardly projecting, preferably centrally symmetrically formed, electrodes which in their respective end region have an ignition surface (12) which in each case lies opposite an ignition surface (26) of a ground electrode (4), wherein the ignition surfaces, if applicable, support welded on or fused on small noble metal plates or small noble metal alloy plates.
17. Spark plug according to Claim 16, characterized in that an encompassing annular groove (61), which adjoins the insulated end region of the ignition surfaces (12) of the centre electrode (3), is formed in said centre electrode (3).
18. Spark plug according to one of Claims 1 to 17, characterized in that the end part (60), which is seated on the end region of the spark plug housing (2), preferably encompassing this, is designed in the form of a rotationally symmetrical cap or in the form of a cylindrical ring and is arranged centrally to the longitudinal axis (A) of the spark plug and extends the spark plug housing (2) on the combustion chamber side in form of an extension piece or intermediate piece.
19. Spark plug according to one of Claims 1 to 18, characterized in that the end part (60), by its combustion chamber-side end region, encompasses the base section of the centre electrode (3) which is remote from the combustion chamber, forming a gap.
20. Spark plug according to one of Claims 1 to 19, characterized in that the end part (60) is connected to the spark plug housing (2) and/or to the wall (8) by means of welding and/or screwing.
21. Spark plug according to one of Claims 1 to 20, characterized in that the end part (60) encompasses the base of the centre electrode (3) and/or the combustion chamber-side, preferably tapering, end region of the insulating body (1), forming a gap (63).
22. Spark plug according to one of Claims 1 to 21, characterized in that the end part (60) has an annular shape and by the inner surface of its end region which is remote from the combustion chamber and/or by its end face which is remote from the combustion chamber, is connected to the spark plug housing (2) or is seated upon this, preferably upon a shoulder (61).
23. Spark plug according to one of Claims 1 to 22, characterized in that the end region of the end part (60) which is remote from the combustion chamber externally encompasses an end region (64) of the spark plug housing (2) which is close to the combustion chamber, forming a gap (56), if applicable, or is connected to its outer wall surface.
24. Spark plug according to one of Claims 1 to 23, characterized in that the end face of the wall (8) which is remote from the combustion chamber is seated upon the end part (60), preferably upon the shoulder (58), and is connected to this, preferably by means of welding.
25. Spark plug according to one of Claims 1 to 24, characterized in that the ground electrode carrier (6) is formed in one piece with the end part (60) and/or in that the ground electrode carrier (6) projects from the end part (60) in the region of the height or a level at which the end face of the wall (8) which is remote from the combustion chamber is connected to the end part (60).
26. Spark plug according to one of Claims 1 to 25, characterized in that the wall (8) encompasses the ground electrode carrier (6) at a distance, forming a gap (53).
27. Spark plug according to one of Claims 1 to 26, characterized in that the combustion chamber-side end of the centre electrode (3) terminates at the level of the end of the centre electrode base (3a) or does not project beyond the combustion chamber-side end of the centre electrode base (3a).
28. Spark plug according to one of Claims 1 to 27, characterized in that the electrodes (4) and/or small ignition plates (24) which are supported by the centre electrode (3) and/or by the ground electrode carrier (6) do not project beyond the combustion chamber-side end of the centre electrode base (3a) on the combustion chamber side.
29. Spark plug according to one of Claims 1 to 28, characterized in that a sleeve-like intermediate piece (70) is arranged between the prechamber (5') and the spark plug housing (2) and is supported by the spark plug housing (2) or is seated upon this and/or connected to this, for example by means of welding, wherein the intermediate piece (70) supports the prechamber (5') or its wall (8), or the prechamber (5') is seated by its wall (8) upon the intermediate piece (70) and/or is connected to this, for example by means of welding.
30. Spark plug according to one of Claims 1 to 29, characterized in that the intermediate piece (70) is formed by a cylindrical sleeve which is pushed onto the spark plug housing (2) and fixed in the pushed-on position or fastened on the spark plug housing (2), for example by means of welding.
31. Spark plug according to one of Claims 1 to 30, characterized in that the intermediate piece (70) encompasses at least the combustion chamber-side end region of the spark plug housing (2) and of the insulating body (1) and of the centre electrode base (3).
32. Spark plug according to one of Claims 1 to 31, characterized in that the outer wall of the spark plug housing (2) is thread-free or turned.
33. Spark plug according to one of Claims 1 to 32, characterized in that the inner wall surface of the intermediate piece (2) is separated from the ground electrode carrier (6) by means of a gap (53).
34. Spark plug according to one of Claims 1 to 33, characterized in that the outer surface of the intermediate piece (70) is provided with a thread (51) by means of which the spark plug can be screwed into an engine block.
35. Spark plug according to one of Claims 1 to 34, characterized in that combustion chamber-side end region of the intermediate piece (70) projects beyond the electrodes and also the centre electrode (3) and the ground electrodes (4) and the centre electrode base (3a) in the direction of the combustion chamber.
36. Intermediate piece according to one of Claims 1 to 35, characterized in that the wall (8) of the prechamber (5) is connected to the combustion chamber-side end region (54) of the intermediate piece (70), for example by means of welding.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ATA230/2011A AT511157B1 (en) | 2011-02-21 | 2011-02-21 | SPARK PLUG |
| ATA230/2011 | 2011-02-21 | ||
| PCT/AT2012/000037 WO2012113002A1 (en) | 2011-02-21 | 2012-02-20 | Spark plug having an end part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2826807A1 true CA2826807A1 (en) | 2012-08-30 |
Family
ID=46021941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2826807A Abandoned CA2826807A1 (en) | 2011-02-21 | 2012-02-20 | Spark plug with end part |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP2678907B2 (en) |
| AT (1) | AT511157B1 (en) |
| AU (1) | AU2012220326A1 (en) |
| BR (1) | BR112013021147B1 (en) |
| CA (1) | CA2826807A1 (en) |
| ES (1) | ES2611904T5 (en) |
| FI (1) | FI2678907T4 (en) |
| WO (1) | WO2012113002A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9564740B2 (en) | 2014-12-02 | 2017-02-07 | Federal-Mogul Ignition Gmbh | Spark plug for a gas-powered internal combustion engine |
| US10109986B2 (en) | 2016-11-03 | 2018-10-23 | Federal-Mogul Ignition Gmbh | Prechamber spark plug for a gas-powered internal combustion engine, and method for manufacturing same |
| US11183818B2 (en) | 2017-04-10 | 2021-11-23 | Federal-Mogul Ignition Gmbh | Pre-chamber spark plug with orientated openings |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT511157B1 (en) | 2011-02-21 | 2014-01-15 | Francesconi Christian | SPARK PLUG |
| DE102013221963B4 (en) * | 2013-10-29 | 2019-10-17 | Dkt Verwaltungs-Gmbh | prechamber |
| JP6057960B2 (en) * | 2014-09-16 | 2017-01-11 | 日本特殊陶業株式会社 | Spark plug and method of manufacturing spark plug |
| DE102017102128B4 (en) | 2016-02-18 | 2019-01-24 | Federal-Mogul Ignition Gmbh | Spark plug for a gas-fueled internal combustion engine |
| US10641159B2 (en) | 2016-09-23 | 2020-05-05 | Caterpillar Inc. | Pre-chamber assembly for fuel injector |
| US10273869B2 (en) | 2016-10-14 | 2019-04-30 | Caterpillar Inc. | Prechamber ignition device for internal combustion engine, and method |
| DE102020213737A1 (en) * | 2020-11-02 | 2022-05-05 | Robert Bosch Gesellschaft mit beschränkter Haftung | prechamber spark plug |
| AT524410A1 (en) * | 2020-11-09 | 2022-05-15 | Greenwood Power Gmbh | Arrangement of a measuring device |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1542631A (en) † | 1923-07-13 | 1925-06-16 | Morrison Lewis | Spark plug |
| FR1001923A (en) † | 1946-07-02 | 1952-02-29 | Improvement in spark plugs | |
| US2702537A (en) † | 1951-08-14 | 1955-02-22 | Boeing Co | Cool core hot cavity spark plug |
| JPS5669416A (en) † | 1979-11-11 | 1981-06-10 | Yariichi Hisada | Unit consisting of accessory chamber and spark plug |
| RU2154002C1 (en) * | 1999-10-14 | 2000-08-10 | Архипов Владимир Алексеевич | Propulsor using wave energy |
| AT410151B (en) * | 2001-06-05 | 2003-02-25 | Jenbacher Ag | SPARK PLUG OF AN INTERNAL COMBUSTION ENGINE |
| JP2006144648A (en) † | 2004-11-18 | 2006-06-08 | Nissan Motor Co Ltd | Precombustion chamber spark ignition internal combustion engine |
| JP2008186667A (en) † | 2007-01-29 | 2008-08-14 | Denso Corp | Spark plug for internal combustion engine |
| AT506140B1 (en) * | 2007-11-05 | 2009-11-15 | Francesconi Christian | SPARK PLUG |
| DE102010004851B4 (en) † | 2009-12-18 | 2014-05-28 | Federal-Mogul Ignition Gmbh | Prechamber spark plug for a gas-powered internal combustion engine |
| US9745892B2 (en) † | 2010-12-31 | 2017-08-29 | Prometheus Applied Technologies, Llc | Prechamber ignition system |
| AT511157B1 (en) † | 2011-02-21 | 2014-01-15 | Francesconi Christian | SPARK PLUG |
-
2011
- 2011-02-21 AT ATA230/2011A patent/AT511157B1/en active
-
2012
- 2012-02-20 EP EP12717578.4A patent/EP2678907B2/en active Active
- 2012-02-20 WO PCT/AT2012/000037 patent/WO2012113002A1/en active Application Filing
- 2012-02-20 BR BR112013021147-4A patent/BR112013021147B1/en active IP Right Grant
- 2012-02-20 ES ES12717578T patent/ES2611904T5/en active Active
- 2012-02-20 FI FIEP12717578.4T patent/FI2678907T4/en active
- 2012-02-20 AU AU2012220326A patent/AU2012220326A1/en not_active Abandoned
- 2012-02-20 CA CA2826807A patent/CA2826807A1/en not_active Abandoned
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9564740B2 (en) | 2014-12-02 | 2017-02-07 | Federal-Mogul Ignition Gmbh | Spark plug for a gas-powered internal combustion engine |
| US10109986B2 (en) | 2016-11-03 | 2018-10-23 | Federal-Mogul Ignition Gmbh | Prechamber spark plug for a gas-powered internal combustion engine, and method for manufacturing same |
| US11183818B2 (en) | 2017-04-10 | 2021-11-23 | Federal-Mogul Ignition Gmbh | Pre-chamber spark plug with orientated openings |
Also Published As
| Publication number | Publication date |
|---|---|
| BR112013021147B1 (en) | 2021-11-03 |
| AT511157B1 (en) | 2014-01-15 |
| AT511157A1 (en) | 2012-09-15 |
| ES2611904T3 (en) | 2017-05-11 |
| BR112013021147A2 (en) | 2019-09-17 |
| EP2678907A1 (en) | 2014-01-01 |
| EP2678907B1 (en) | 2016-10-19 |
| ES2611904T5 (en) | 2023-12-12 |
| WO2012113002A1 (en) | 2012-08-30 |
| EP2678907B2 (en) | 2023-06-21 |
| FI2678907T4 (en) | 2023-09-12 |
| AU2012220326A1 (en) | 2013-09-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2826807A1 (en) | Spark plug with end part | |
| US9972979B2 (en) | Prechamber spark plug for igniting a fuel-air mixture in an internal combustion engine | |
| AU2012220325B2 (en) | Spark plug | |
| US8912716B2 (en) | Copper core combustion cup for pre-chamber spark plug | |
| US8890396B2 (en) | Spark plug for a gas-operated internal combustion engine | |
| US20110089803A1 (en) | Spark Plug Comprising a Ground Electrode Support | |
| US10944244B2 (en) | Spark plug | |
| JP2008108479A (en) | Spark plug for internal combustion engine | |
| JP2011511419A (en) | High position thread ground shield | |
| JP2008108478A (en) | Spark plug for internal combustion engine | |
| US9564740B2 (en) | Spark plug for a gas-powered internal combustion engine | |
| US8040029B2 (en) | Spark plug for motor vehicle internal combustion engine | |
| CN113646980B (en) | Prechamber spark plug with adapted cover geometry | |
| US11552456B1 (en) | Pre-chamber spark plug | |
| US20200099198A1 (en) | Spark plug of internal combustion engine | |
| CN213753446U (en) | Spark plug and engine | |
| JP2009508312A (en) | Spark plug | |
| JP7228749B2 (en) | SPARK PLUG AND METHOD FOR MANUFACTURING SPARK PLUG | |
| JP6645168B2 (en) | Spark plug | |
| JP2019139901A (en) | Spark plug | |
| US10084290B2 (en) | Multipoint ignition device and multipoint ignition engine | |
| JP7093223B2 (en) | How to make a spark plug and a spark plug | |
| GB2601762A (en) | Pre-combustion chamber assembly with ignition electrodes for an internal combustion engine | |
| JP7455518B2 (en) | Internal combustion engine and spark plug | |
| CN101350501A (en) | Spark plug |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |
Effective date: 20170217 |
|
| FZDE | Discontinued |
Effective date: 20190220 |