WO2012113002A1 - Spark plug having an end part - Google Patents

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 claim 1.

 Such spark plugs are known from WO 2009/059339 A1.

 The aim of the invention is to simplify the production of such spark plugs, especially in view of the fact that complicated to be made complex components are avoided and the spark plug is made of easily manufacturable parts. This is especially important for mass production. Furthermore, the electrical properties of such spark plugs should at least match those of comparable spark plugs, if not exceed these properties. Accordingly, care must be taken to ensure optimum power conduction via the individual earth electrodes. Finally, the ignition properties, preferably by optimizing the thermal conductivity and the heat dissipation from the ignition surfaces to be improved in order to achieve better stability.

 These objects are achieved in a spark plug of the type mentioned above with the features mentioned in the characterizing part of claim 1. The end portion extends the spark plug housing and allows the electrode assembly to be short and compact. The heat dissipation from the electrodes, the current distribution, the corrosion resistance and the ignition reliability are thus considerably improved. A major reason for this lies in the shorter overall height or the approach of the electrodes to the insulating body.

 It is advantageous if the ground electrode carrier seen perpendicular to the longitudinal axis of the spark plug, from the center electrode has a smaller distance than the inner surface of the wall of the chamber and at least one finger-shaped ground electrode carries with an ignition surface which at the height level of the ignition surface of the center electrode in the chamber is located, or when the ground electrode carrier seen perpendicular to the longitudinal axis of the spark plug, from the center electrode has a greater distance than the outer surface of the wall of the chamber and at least one finger-shaped ground electrode which extends through a recess in the wall into the chamber, wherein the Ignition surface of the ground electrode at the height level of the ignition surface of the center electrode is located in the chamber. Thus, a compact electrode structure is achieved, which is easy to manufacture and can be mounted on the end part.

The arrangement of the ground electrodes on a separate carrier ensures a uniform power line through 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 set with respect to power and heat conduction from the wall of the Chamber independent system. This allows a simple readjustment of the ground electrodes and it can be easily corrected the Einsatzbedingte electrode burn-off. Due to the ability to make the ground electrode carrier and the ground electrodes independently, especially as a one-piece component, and place it on the end part, considerable advantages in terms of manufacture result. Furthermore, the fact that the ground electrodes can be manufactured with the ground electrode carrier as a one-piece component, and that there is a gap between the ground electrode carrier and the wall of the chamber achieves improved heat dissipation from the ignition electrodes to the end part and to the spark plug housing. The special shape of the ground electrodes and their arrangement provide further advantages in terms of improved ignition performance and shielding or flow through the chamber, even if the height of the electrodes arranged at the end part is lower than in comparable conventional spark plugs.

 A particularly simple production with a stable construction of the spark plug is achieved by the special shape of the ground electrode carrier. The cylindrical-shaped cross-section having ground electrode carrier can be adjusted in a simple manner in a circumferentially constant distance from the outer surface of the wall of the chamber, resulting in defined conditions with respect to combustion and power line. Furthermore, the structure and the assembly of the spark plug are simplified, since the cylindrical annular ground electrode carrier and also a cylinder-cylindrical cross-section having chamber in a simple manner placed on the end portion and fastened there. This advantageous attachment is achieved when the ground electrode carrier and the wall are supported by the arranged on the combustion chamber side end portion of the spark plug housing end portion. The ground electrode carrier can be formed on its inner wall surface with a thread or also have a smooth surface; The same applies to the wall of the chamber. Either the ground electrode carrier or the wall of the chamber are screwed onto the respective protruding end heels of the end and / or fixed by welding in their position or these components are pushed with the closest possible fit on the end part and fixed in its desired position, in particular by welding ,

It can be provided that on the end part of two concentric cylindrical end paragraphs are formed, of which optionally the inner end paragraph dominates the outer end paragraph towards the combustion chamber, said on the outer end paragraph of the ground electrode carrier with the walls passing through ground electrodes and on the inner end paragraph the wall of the chamber each placed, plugged or screwed and / or by, optionally point- or seam-shaped, welding is attached, or wherein on the outer end paragraph, the wall of the chamber and on the inner end of the distance from the inner surface of the wall lying ground electrode support each placed, plugged or screwed and / or by, optionally punctiform or seam-shaped, welding is attached.

 It is advantageous if the end part is integrally formed with the wall, wherein the ground electrode carrier is placed on the end part, plugged or screwed and / or by, optionally punctiform or seam-shaped, welding is attached or that the end part is formed integrally with the ground electrode carrier , wherein the wall surrounding the ground electrode at a distance on the end part, placed or screwed on and / or by, optionally punctiform or seam-shaped, welding is attached.

 Thus, the production of the spark plug is simplified and the spark plug housing is extended at the same spark plug total length. It results in the same length of the spark plug better heat dissipation from the ground electrode and the wall in the spark plug housing and the risk of Glühzündungen is reduced.

 In principle, the ground electrode carrier could additionally be fastened on the combustion chamber end region of the spark plug housing.

 In terms of manufacturing, there are advantages if the ground electrode carrier is perpendicular to the longitudinal axis of the spark plug, has an at least partially circular cross-section or is formed by a cylinder ring and / or the at least one ground electrode and the ground electrode carrier are integrally formed or joined together by welding.

 Regarding the heat resistance of the spark plug, it is advantageous when in the

Wall passage openings are formed for the passage of the fuel gas.

 For the function of the spark plug, there are advantages if the ground electrode carrier carries one, three or five ground electrodes and / or if the ground electrodes are arranged distributed on the ground electrode carrier at equal distances to each other around the center electrode and / or if each of the ground electrode outgoing ground electrode at least in Partial regions of their longitudinal extent has a rectangular or cylindrical ring-section-shaped cross-section and / or if the ignition gap between parallel to the longitudinal axis extending, opposing surface areas of the grounding electrode and the center electrode is formed.

A simple structure results when on the two concentric Endabsätzen of the end portion in each case an external thread and on the inner wall surface of the Wall and / or on the inner wall surface of the ground electrode carrier in each case adapted to the respective external thread internal thread is formed and / or if the ground electrode carrier and the cylindrical wall are formed concentrically to form the predetermined distance and optionally a height offset to each other and / or if the cylindrical wall and / or the ground electrode carrier is attached to the respective end paragraph and fixed there by welding.

 For the construction of the spark plug, in particular with regard to the current and heat conductivity or heat dissipation, it is advantageous if in the wall a number of parallel to the direction of the longitudinal axis of the spark plug running, preferably parallel slits is formed, through which the Ground electrodes are guided into the interior of the chamber, wherein the slots optionally extend from the combustion chamber side end face of the wall to the level range of the end side of the end portion.

 When the ground electrodes are outside the wall and through the

Longitudinal slots protrude into the bounded by the wall chamber, the ground electrodes have a shielding effect and between the ground electrodes and the adjacent slot surfaces, a certain desired circulation of the gas can be maintained, which helps to cool the electrodes. This avoids excessive heat build-up and counteracts pre-ignition.

 The spark plug according to the invention is a special embodiment of a shield spark plug.

 It is advantageous for the ignition and heat dissipation, if from the running parallel to and outside of the wall extending a preferably radially through the slot into the chamber guided Zündflächenenträger and / or if the Zündflächenträger a preferably parallel to the direction of the longitudinal axis of the spark plug extending, the circumferential course of the wall following and the slot partially occlusive or at least partially arranged in the slot space connecting part in the direction of the combustion chamber and optionally ends there in the same plane with the end face of the wall and / or if the outgoing from the ground electrode carrier portion of the ground electrode outside Peripheral region of the wall is located in front of the slot. By this exemption of the wall, the wall can be better cooled by the gas to be burned.

In a preferred embodiment, it is provided that the center electrode has a number of radially outwardly outgoing, preferably centrically symmetrically formed electrodes which have an ignition surface in their respective end region which in each case opposes an ignition surface of a ground electrode. A Simplified production and exact firing performance result if, subsequent to the insulator-side end of the firing surfaces of the center electrode, an annular groove running around it is formed

 An advantageous embodiment of the end portion provides that the patch on the end portion of the spark plug housing end portion is rotationally symmetrical, preferably cylindrical, and arranged centrally to the longitudinal axis of the spark plug and the spark plug housing in the form of an intermediate piece extended combustion chamber side and / or that the end portion with its combustion chamber end portion surrounds the base region of the center electrode.

 A structurally simple and reliable construction results when the end part is connected to the spark plug housing by welding and / or screws and / or when the end part surrounds the base of the center electrode and the insulating body to form a distance.

 Fig. 1 shows a schematic longitudinal section through an embodiment of a spark plug according to the invention. FIGS. 2a and 2b show embodiments of a center 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 an attached end part. Fig. 4c shows a spark plug according to the invention with an attached end part, which is made in one piece with the wall of the chamber, wherein the ground electrode carrier is welded to this end part. 5 and 6 show embodiments of spark plugs in which the ground electrodes or the ground electrode carrier are located within the wall on an end portion or are integrally connected to the end portion. FIGS. 7 to 9 show embodiments of spark plugs having an end part placed on the spark plug housing and electrodes surrounded by an antechamber. 10 and 11 show a spark plug with an annular sleeve arranged between the end part and the prechamber.

 In the following the invention will be explained in more detail with reference to the drawing, for example.

Fig. 1 shows a spark plug for use in an internal combustion engine, in particular for a gasoline engine. From a insulating body 1, a spark plug housing 2 is supported, wherein from the insulating body 1, a base center electrode 3a is enclosed or going off. On this base center electrode 3a of the spark plug, the center electrode 3 having at least one ignition surface 12 is mounted. The ignition surfaces 12 are on projecting protrusions of the center electrode. 3 To form at least one ignition gap 13, at least one ground electrode 4 carried by a ground electrode carrier 6 is provided. Advantageously, the ground electrodes 4 are arranged distributed on the ground electrode carrier 6 at equal distances from each other about the center electrode 3. The ground electrode carrier 6 is supported by an end portion 60 attached to the spark plug body 2, and is fixed thereto.

 As can be seen from FIG. 1, the ground electrodes 4 each extend in the form of a finger with a section 41 away from the ground electrode carrier 6 and are fastened, preferably welded, to the carrier 6. The ground electrode 4 and the carrier 6 may optionally be designed as a one-piece component. 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 center electrode 3. The ignition gap 13 is between the opposing ignition surfaces 26, 12 of the ground electrode 4 and the center electrode 3 is formed. These ignition surfaces 26, 12 may preferably be covered with noble metal or noble metal alloys in the form of tracks or plates.

 For attachment of the ground electrode carrier 6 at the end portion 60 is provided that the end portion 60 has two concentric cylindrical end heels 17, 18, of which the inner end paragraph 17 dominates the outer end paragraph 18 toward the combustion chamber. On the outer end shoulder 18 of the ground electrode support 6 and on the inner end paragraph 17 is a combustion chamber side open chamber 5 formed wall 8 placed, plugged or screwed and / or optionally secured by, in particular point or seam-shaped, welding. The inner dimensions of the wall 8 and the ground electrode carrier 6 are adapted to the respective outer dimensions of the end paragraphs 17, 18. The wall 8 forms a shield or an open chamber and the spark plug according to the invention can also be referred to as a shielding spark plug.

The ground electrode carrier 6 and in particular also the portion 41 of each of the ground electrode 4 departing from the ground electrode carrier 6 are at a distance from the outer surface 7 of the wall 8 chamber 5, possibly offset with respect to the center electrode 3 down towards the spark plug housing 2 arranged. This distance is provided in order to ensure a defined or uninfluenced current flow in the ground electrode carrier 6. Furthermore, by the distance 21, as already mentioned above, an independent or defined heat dissipation from the ground electrodes 4 to the spark plug housing 2 allows. In Fig. 1, a spark plug with a cylindrical wall 8 is shown, which surrounds the center electrode 3 circumferentially. Modifications of the shape of such walls or chambers can also be provided.

 A simple structure and a simple production of the parts arise when the wall 8 of the combustion chamber side open swirl chamber 5 and the ground electrode carrier 6 at least partially have annular cross-section or are each formed by a cylinder ring.

 In the wall 8 through openings 10 may be formed for the passage of the gas.

 Each finger-shaped ground electrode 4 is advantageously from

Ground electrode support 6 is bent to form the center electrode 3 in the form of a Zündflächenträgers 51 to form a parallel to the wall 8 extending portion 41 and ends in front of the center electrode 3. In the wall 8 to slots 50 are formed. The width of these slots 50 substantially corresponds to the width of the section 41 or slightly exceeds this width. These slots 50 extend substantially over the entire height of the wall 8, that is, they go in particular from a region of the wall 8, which lies approximately at the level of the end face of the end portion 60, and terminate at the combustion chamber end face of the wall eighth Through this slot 50, the bent radially extending Zündflächenträger 51 of the ground electrode 4 extends in the direction of the center electrode 3. At the extending radially from the portion 41 through the slot 50 into the interior of the chamber 5 Zündflächenträger 51 includes a parallel to or in the direction the longitudinal axis A of the spark plug extending connecting part 52 at. The connecting part 52 follows the circumferential course of the wall 8 and closes in this area at least partially the slot 50 and is preferably within the slot 50. This connector 52 extends from the Zündflächenträger 51 in the direction of the combustion chamber and ends with the end face of the wall 8 and contributes to regulated gas circulation.

 As can be seen from FIGS. 2 and 3, the center electrode 3 has three centrally symmetrically arranged ignition surfaces 12, to each of which an ignition surface 26 faces a ground electrode 4.

On the radially outwardly facing surface regions 12 of the center electrode 3 and / or on the middle electrode 3 facing surfaces 26 of the respective opposite ground electrodes 4 adjacent tracks 40 may be applied or melted from a noble metal alloy. Instead of directly applied or melted noble metal alloy sheets 40 as shown in FIG. 2a, the noble metal alloy can also be applied or welded onto cantilevered regions 48 of the cylindrical part of the center electrode 3 in the form of noble metal flakes 40 ' or melted, which areas 48 are formed by welded or integrally molded elevations. Such raised areas 48 can also be formed or attached to the ground electrodes 4, onto which noble metal alloy, optionally in the form of noble metal flakes, is applied or welded or melted. On the combustion chamber remote side of the ignition surfaces 12 and directly below the elevations 48 of the center electrode 3, a circumferential annular groove 61 may be formed. This annular groove 61 represents a defined boundary of the ignition surfaces 12 and facilitates the welding and application of noble metal platelets and / or tracks 40, 40 '.

 The wall 8 of the chamber 5 and / or the ground electrodes 4 and / or the

Ground electrode supports 6 are made of nickel-based alloy and / or high-temperature stainless steel and / or hot corrosion-resistant, good thermal conductivity metal alloys; the wall 8 can also be made of brass.

 For the production and operation of the spark plugs, it has proved to be advantageous if the number of ground electrodes 4 is odd or that the ground electrodes 4 do not face each other with respect to the central axis of the center electrode 3. Thus, the application of noble metal alloys on the outgoing from the carrier 6 ground electrodes 4 is easily possible.

 The proposed slot 50 facilitates required maintenance or readjustments.

 The ground electrode carrier 6 and the wall 8 of the chamber 5 are electrically conductively connected to the spark plug housing 2. The center electrode 3 is connected to the base center electrode 3a of the spark plug, preferably by welding; the base center electrode 3a is guided in the insulator body 1 and electrically insulated from the insulator body 1 toward the plug housing 2.

 The ground electrodes 4 are designed in such a way that the section 41 extends substantially straight and without a turn parallel to the wall 8 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 be rounded.

 In Fig. 4a, a known spark plug is shown. L is the length of the

Spark plug housing 2 is referred to, wherein mounted on the combustion chamber end portion of the spark plug 2 of the ground electrode carrier 6 and the wall 8 on corresponding paragraphs 17, 18 of the spark plug housing 2 or in particular by welding. In the case of the spark plug according to the invention according to FIG. 4b, the end part 60 is placed in the form of an intermediate ring on the combustion chamber-side end region of the spark plug housing 2, for example plugged or screwed on and, if necessary, fastened by punctiform or seam-shaped welding. This End portion 60 is used to extend the spark plug housing 2. This end portion 60 carries a shoulder 18 to which the ground electrode support 6 is attached and / or welded and further carries a shoulder 17 which carries the wall 8. This results in a length L1 of spark plug housing 2 and attached end portion 60 which is greater than the length L. Thus, the required parts for ignition, namely the ground electrode 4 and the wall 8 are made shorter and the distance B between the wall. 8 and the shaft or portion 41 of the ground electrode can be made larger. This improves heat dissipation and ignition safety.

 In the embodiment of the spark plug according to FIG. 4 c, the wall 8 is integrally formed with the end part 60, which is fastened to the combustion-chamber-side end region of the spark plug housing 2. At the spark plug housing, a shoulder 64 may be formed, on which the end portion 60 is placed, screwed and optionally secured by seam or spot welding. On the end portion 60 of the ground electrode support 6 is placed, in particular welded. The ground electrode carrier 6 can be placed on a shoulder 18 of the end portion 60 and fixed there by welding.

 The dark arrows, which are directed to the longitudinal axis A of the spark plug, represent possible welds or welds, with which the end portion 60 and / or the ground electrode support 6 and / or the wall 8 can be welded to the respective supporting components.

The spark plug shown in Figs. 5 and 6 has substantially the same structure as the spark plug shown in the other figures, except for the modification that the ground electrodes 4 and the ground electrode support 6 within the wall 8, and at a distance from the inner wall surface 19 of the wall 8 are located in the direction of the center electrode 3 to. From the insulating body 1, a spark plug housing 2 is supported, wherein from the insulating body 1, a base center electrode 3a goes off, on which the center electrode 3 is placed. The ground electrodes 4 arranged around the center electrode 3 are supported by a ground electrode support 6 which is placed on an end shoulder 17 of the end part 60 and optionally fixed thereto by welding. On a further shoulder 18, the wall 8 is placed and optionally secured by welding. The ground electrode support 6 and the ground electrodes 4 are spaced apart from the inner wall surface 19 of the wall 8 by a separation of the earth electrodes 4 from the wall 8 in terms of current and heat dissipation, and the heat can be dissipated via the end portion 60 or via the latter End part 60 an exact and safe power line. As shown in FIG. 6, the ground electrodes 4 may also depart from a ground electrode carrier 6 formed integrally with the end portion 60. In this case, the wall 8 is placed on the end portion 60 on the shoulder 18 and possibly fixed there by welding. Also in this embodiment, a shorter constructed electrode arrangement is achieved, whereby the heat and power line is favorably influenced. In this case, the end portion 60 surrounds the combustion chamber end portion of the insulating body 1 and / or the combustion chamber remote base part of the electrode 3. The integral formation of the end portion 60 and ground electrode support 6 and the ground electrodes 4 results in a simplified production of the spark plug, as on the one-piece, formed by ground electrodes 4 and end portion 60 component only the wall 8 is placed and optionally welded.

 It is also possible to provide other types of attachment for the end portion 60 to the spark plug housing 2 and / or to the wall 8 and / or the ground electrode supports at the end portion 60 and / or the spark plug housing 2, e.g. Pressing. In any case, the end portion 60 will not be placed on the tapered insulator body. The parts are necessarily spaced for isolation reasons. The end portion 60 surrounds the end portion of the insulating body 1 at a distance.

 By one piece, it is understood in particular that the respective component (s) have no welded or soldered connection and are formed from the same material or are present as a single non-composite part or are formed from the same component.

 Spark plugs with open chambers 5 are shown in FIGS. 1 to 6, spark plugs with pre-chambers 5 'are shown in Figs. 7 to 9. The number of openings 10 formed in the chambers 5 and pre-chambers 5 'and their shape or position can be selected or determined by the application of the spark plug.

In Fig. 7, an embodiment of a spark plug according to the invention is shown, in which the ground electrode carrier 6, as in Fig. 6, is integrally formed with the end portion 60. The combustion chamber remote end surface of the end portion 60 is placed on a shoulder 61 of the spark plug housing 2. In particular, this region of the end part 60, as shown at 55 in FIG. 8, can be welded to the spark plug housing 2. The spark plug housing 2 carries on its outer circumference a thread 51, with which it is screwed into an engine block. It is envisaged that the end portion 60 has a ring shape and is connected to the inner surface of its combustion chamber remote end portion and / or with its combustion chamber remote end surface with the spark plug housing 2 or on this, preferably on a shoulder 61, placed. Furthermore, it can be provided that the end region of the end part 60 remote from the combustion chamber has a combustion chamber-near end region 64 of the spark plug housing 2, optionally with the formation of a distance 56, from the outside surrounds or is connected to the outer wall surface. The annular gap 56 may be formed between the end region 56 of the spark plug housing 2 and the end region of the end part 60 remote from the combustion chamber.

 The insulating body 1, which surrounds the base center electrode 3 a, which the

Electrode assembly 3 and the individual electrodes of the center electrode 3 carries is inserted into the spark plug housing 2 using a seal 52.

 The end portion 60 carries with a shoulder 58 the wall 8 of an antechamber 5 'which supports the electrodes, i. the center electrode 3 and the ground electrodes 4 and the ground electrode support 6 roofed. In the pre-chamber 5 'corresponding passage openings 10 are formed.

 Between the ground electrode 6 departing from the end portion 60 and the inner surface of the wall 8, a gap 53 is recessed in each case, so that the current distribution and heat dissipation are defined.

 It is further provided that the ground electrode carrier 6 depart from the end portion 60 in the area or on the level in which the combustion chamber remote end face of the wall 8 is connected to the end portion 60 and the shoulder 58 is located. The ground electrode carrier 6 is made very short or squat in this embodiment and the electrodes 4 are located near the end portion 60.

 The center electrode 3 is designed such that the combustion chamber end of the

Center electrode 3 with the end of the center electrode 3, the base center electrode 3a closes or the combustion chamber end of the base center electrode 3a does not exceed or that carried by the center electrode 3 and / or by the ground electrodes 6 electrodes 4 and / or Zündplättchen 24, the combustion chamber end of the Base center electrode 3a not project beyond the combustion chamber side. Thus, a short, compact construction of the electrodes is achieved, whereby the heat transfer and power distribution are favorably influenced.

 In an embodiment of a prechamber spark plug according to FIG. 8, welding seams 55 to be advantageously attached are shown with which the spark plug housing 2 can be connected to the end part 60 or the end part 60 can be connected to the wall 8 of the prechamber 5 '. Such welds 55 may also be used to connect the center electrode 3 to the base center electrode 3a.

In principle, the gap 53 could also be omitted or the inner surface of the wall 8 could abut against the outwardly directed surface of the ground electrode carrier 6 or be connected thereto. However, the formation of a gap 53 brings defined heat and current conditions. 9 shows a prechamber spark plug in which the chamber 5 'has a different shape than the chamber 5' of the spark plugs according to FIGS. 7 and 8. In addition to FIG. 8, the electrode arrangement 3 does not protrude beyond the base electrode 3a on the combustion chamber side out, as is the case with the spark plug according to FIG. 8. It can be seen in 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 shown in FIGS. 7 and 9. The center electrode 3 projects beyond the base center electrode 3 a in FIG. 8, so that a higher electrode structure or a higher construction of the end part 60 with the mass electrode carriers 6 carried by it results.

 10 and 11 show a spark plug, in which the spark plug housing 2 with a

Sleeve 70 is extended combustion chamber side, which carries the antechamber 5 '.

 Fig. 10 shows a spark plug in which the pre-chamber 5 'is not directly supported by the spark plug housing 2, but indirectly using or use of an intermediate piece 70, this intermediate piece 70 is connected to the outer wall of the spark plug housing 2 and is supported by this and the combustion chamber-side end portion of the intermediate piece 70 carries the antechamber 5 'and is connected to the wall 8 of the antechamber 5', eg by welding, connected.

 For the production of such a spark plug, a thread possibly present on the spark plug housing 2 can be turned off and the cylindrical intermediate piece fitted onto the spark plug housing 2 prepared in this way and fastened by welding, in particular spot welding or laser welding. As is apparent from Figs. 10 and 11, it is provided that the combustion chamber-side end portion of the intermediate piece 70 surrounds the electrodes of the spark plug and the base center electrode 3a and also the insulating body 1. It is advantageous if between the spacer 70 and the ground electrode support 6, a gap 53 is recessed to make the heat dissipation and the current flow defined. The placing of the intermediate piece 70 on the spark plug housing 2 takes place after mounting the electrodes on the base center electrode 3a and mounting of the end portion 60 with the ground electrode support 6 on the spark plug housing second

 The formed on the outer wall surface of the intermediate piece 70 thread 51 is designed such that the spark plug can be screwed into an engine block.

The intermediate piece 70 can be placed on a shoulder 71 of the spark plug housing 2 or applied to this. For this purpose, a base paragraph 72 is integrally formed on the intermediate piece 70, which can also serve as a carrier for a possibly provided sealing ring 74. Between the spark plug housing 2 and the insulating body 1, the seal 52 is provided. Furthermore, an essay of the insulating body or of the spark plug housing 2 or the connection of these two components via a base component 73rd

 The pre-chamber 5 'does not project beyond the intermediate piece 70 in the radial direction to the spark plug longitudinal axis. Furthermore, advantageously, the wall 8 of the antechamber 5 'free of a thread.

Claims

claims: 1. spark plug of an internal combustion engine, preferably for gasoline-gas engines, with an insulating body (1) surrounding spark plug housing (2) and a center electrode (3) and at least one of a ground electrode carrier (6) carried earth electrode (4), wherein the ignition surfaces (12) the center electrode (3) and the ignition surface (26) of the ground electrode (4) are surrounded by a wall (8) having a combustion chamber side open chamber (5) or through openings (10) comprising antechamber (5 '), characterized that on the combustion chamber-side end portion of the spark plug housing (2) has an end portion (60) is placed and in that the ground electrode carrier (6) and the wall (8) are carried by this end part (60). 2. Spark plug according to claim 1, characterized  - that the ground electrode support (6) seen perpendicular to the longitudinal axis (A) of the spark plug (2), from the center electrode (3) has a smaller distance than the inner surface (19) of the wall (8) of the chamber (5) or the antechamber ( 5 ') and carries at least one finger-shaped ground electrode (4) with an ignition surface (26), which is preferably at the height level of the ignition surface (12) of the center electrode (3) in the chamber (5) or the prechamber, or  - that the ground electrode carrier (6) seen perpendicular to the longitudinal axis (A) of the spark plug (2), from the center electrode (3) has a greater distance than the outer surface (7) of the wall (8) of the chamber (5) or the antechamber ( 5 ') and at least one finger-shaped ground electrode (4), which extends through a recess (50) in the wall (8) into the chamber (5) or the pre-chamber, wherein the ignition surface (26) of the ground electrode (4) preferably at the height level of the ignition surface (12) of the center electrode (3) in the chamber (5) or the prechamber (5 ') is located. 3. Spark plug according to claim 1 or 2, characterized in that on the end part (60) two concentric cylindrical end heels (17, 18) are formed, of which optionally the inner end shoulder (17) the outer end shoulder (18) in the direction Firing space dominated, wherein on the outer end shoulder (18) of the ground electrode carrier (6) with the wall (8) passing through ground electrodes (4) and on the inner end paragraph (17), the wall (8) of the chamber (5) or the antechamber ( 5 ') each placed, plugged or screwed and / or by, optionally punctiform or seam-shaped, welding is attached, or wherein on the outer end shoulder (18) the wall (8) of the chamber (5) or the antechamber (5 ') and on the inner end shoulder (17) of the spaced from the inner surface (19) of the wall (8) lying ground electrode carrier ( 6) each placed, plugged or screwed and / or by, optionally point or seam-shaped, welding is attached. 4. Spark plug according to one of claims 1 to 3, characterized in that the end part (60) with the wall (8) is integrally formed, wherein the outside of the wall (8) located ground electrode carrier (6) mounted on the end portion (60) , plugged or screwed on and / or by, optionally punctiform or seam-shaped, welding is attached or that the end part (60) with the ground electrode support (6) is integrally formed, wherein the ground electrode (6) at a distance surrounding wall (8) the end part (60) placed, plugged or screwed and / or by, optionally punctiform or seam-shaped, welding is attached. 5. Spark plug according to one of claims 1 to 4, characterized in that the spark plug housing (2) near base of the ground electrodes (4) interspersed wall (8) is closer to the combustion chamber end of the spark plug than the ground electrode carrier (6), or in that the base of the ground electrode carrier (6) facing the spark plug housing (2) is further from the combustion chamber end of the spark plug than the base of the wall (8) surrounding 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), in the section perpendicular to Seen longitudinal axis (A) of the spark plug, at least partially have annular cross-section or are formed by a cylinder 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 integrally formed or joined together by welding. 8. Spark plug according to one of claims 1 to 7, characterized in that in the wall (8) through recesses (10) are formed for the passage of the fuel gas. 9. Spark plug according to one of claims 1 to 8, characterized in that the ground electrode carrier (6) carries one, three or five ground electrodes (4) and / or that the ground electrodes (4) on the ground electrode carrier (6) at equal distances to each other the center electrode (3) are arranged distributed and / or that each of the mass electrode (6) outgoing ground electrode (4) has at least in partial areas of its longitudinal extent in a section (41) in cross-section rectangular or cylindrical ring section-shaped cross-section. 10. Spark plug according to one of claims 1 to 9, characterized in that the spark gap (13) extending parallel to the longitudinal axis (A), opposite, the ignition surfaces (12, 26) forming, optionally having a precious metal or precious metal alloy order, Surface regions of the ground electrode (4) and the center electrode (3) is formed. 11. Spark plug according to one of claims 1 to 10, characterized in that on the two concentric Endabsätzen (17, 18) of the end portion (60) each have an external thread and on the inner wall surface (19) of the wall (8) and on the inner wall surface (20) of the ground electrode carrier (6) each adapted to the respective external thread internal thread is formed and / or that the ground electrode carrier (6) and the wall (8) to form a predetermined radial distance (21) and optionally a height offset are arranged concentrically to each other and / or that the wall (8) and the ground electrode carrier (6) are plugged onto the respective end shoulder (17, 18) and fastened there by welding. 12. Spark plug according to one of claims 1 to 11, characterized in that in the wall (8) a number of parallel to the direction of the longitudinal axis (A) of the spark plug extending slots (50) is formed, through which the ground electrodes (4) in the interior of the chamber (5) or the antechamber (5 ') are guided, wherein the slots (50) optionally from the combustion chamber side end face of the wall (8) to the level range of the end face of the inner end portion (17) or the face level of End part (60) extend. 13. Spark plug according to one of claims 1 to 12, characterized in that the from the ground electrode carrier (6) outgoing portion (41) of the respective ground electrode (4) outside the peripheral area of the wall (8) in the front of each slot (50) lying area and / or parallel to the longitudinal axis (A) of the spark plug is aligned. 14. Spark plug according to one of claims 1 to 13, characterized in that from the preferably parallel to and outside the wall (8) extending portion (41) of the ground electrode (4) preferably radially through the slot (50) into the interior of the Chamber (5) of leading Zündflächenträger (51) goes wearing welded or fused precious metal or precious metal alloy plate. 15. Spark plug according to one of claims 1 to 14, characterized in that from the section (41), in particular from the Zündflächenträger (51), a preferably parallel to the direction of the longitudinal axis (A) extending, the circumferential course of the wall (8) following and the slot (50) partially occlusive or at least partially in the slot (50) extending connecting part (52) in the direction of the combustion chamber and optionally ends 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 center electrode (3) has a number radially outwardly outgoing, preferably centrically symmetrically formed electrodes having an ignition surface (12) in their respective end region, each having an ignition surface (26) facing a ground electrode (4), wherein the ignition surfaces optionally wear welded or fused precious metal or noble metal alloy platelets. 17. A spark plug according to claim 16, characterized in that subsequent to the insulated end region of the ignition surfaces (12) of the center electrode (3) in the Center electrode (3) has a circumferential annular groove (61) is formed. 18. Spark plug according to one of claims 1 to 17, characterized in that on the end region of the spark plug housing (2) patch, preferably surrounding this, the end part (60) in the form of a rotationally symmetrical cap or in the form of a cylindrical ring and centric to the longitudinal axis ( A) of the spark plug is arranged and extends the spark plug housing (2) in the form of an extension or intermediate piece on the combustion chamber side. 19. Spark plug according to one of claims 1 to 18, characterized in that the end part (60) surrounds the combustion chamber remote base region of the central electrode (3) with its combustion chamber end region forming a distance. 20. Spark plug according to one of claims 1 to 19, characterized in that the end part (60) with the spark plug housing (2) and / or the wall (8) is connected by welding and / or screws. 21. Spark plug according to one of claims 1 to 20, characterized in that the end part (60) the base of the center electrode (3) and / or the combustion chamber side, preferably tapered, end portion of the insulating body (1) to form a distance (63) surrounds. 22. Spark plug according to one of claims 1 to 21, characterized in that the end portion (60) has annular shape and connected to the inner surface of its combustion chamber remote end portion and / or with its combustion chamber remote end surface with the spark plug housing (2) or on this, preferably one Paragraph (61). 23. Spark plug according to one of claims 1 to 22, characterized in that the combustion chamber distant end portion of the end portion (60) a combustion chamber near end portion (64) of the spark plug housing (2), optionally with the formation of a distance (56), engages from the outside or with the Outside wall surface is connected. 24. Spark plug according to one of claims 1 to 23, characterized in that the combustion chamber remote end face of the wall (8) on the end part (60), preferably the shoulder (58), placed and connected thereto, preferably by welding. 25. Spark plug according to one of claims 1 to 24, characterized in that the mass electrode carrier (6) is formed integrally with the end part (60) and / or that the mass electrode carrier (6) from the end part (60) in the region of height or one Levels goes off, on or on which the combustion chamber remote end surface of the wall (8) is connected to the end portion (60). 26. Spark plug according to one of claims 1 to 25, characterized in that the wall (8) surrounding the ground electrode carrier (6) to form a gap (53) at a distance. 27. Spark plug according to one of claims 1 to 26, characterized in that the combustion chamber-side end of the center electrode (3) at the level of the end of the Basis center electrode (3a) terminates or the combustion chamber-side end of the base center electrode (3a) does not protrude. 28. Spark plug according to one of claims 1 to 27, characterized in that the of the center electrode (3) and / or carried by the ground electrode carrier (6) Electrodes (4) and / or ignition plate (24) the combustion chamber-side end of the base center electrode (3a) do not project beyond the combustion chamber side. 29. Spark plug according to one of claims 1 to 28, characterized in that between the pre-chamber (5 ') and the spark plug housing (2) has a sleeve-shaped Intermediate piece (70) is arranged, which supported by the spark plug housing (2) or placed on this and / or with this, e.g. by welding, wherein the intermediate piece (70) carries the prechamber (5 ') or its wall (8) or the prechamber (5') with its wall (8) placed on the intermediate piece (70) and / or with this, eg by welding, is connected. 30. A spark plug according to one of claims 1 to 29, characterized in that the intermediate piece (70) is formed by a cylinder sleeve which is pushed onto the spark plug housing (2) and fixed in the pushed position or on the spark plug housing (2), e.g. by welding, is attached. 31. Spark plug according to one of claims 1 to 30, characterized in that the intermediate piece (70) at least the combustion chamber-side end portion of the spark plug housing (2) and the insulating body (1) and the base center electrode (3) surrounds. 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 off. 33. Spark plug according to one of claims 1 to 32, characterized in that the inner wall surface of the intermediate piece (2) from the ground electrode carrier (6) by a gap (53) is separated. 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) with 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 the combustion chamber end portion of the intermediate piece (70) projects beyond the electrodes and the center electrode (3) and the ground electrodes (4) and the base center electrode (3a) in the direction of the combustion chamber. 36. An intermediate piece according to any one of claims 1 to 35, characterized in that the wall (8) of the prechamber (5) with the combustion chamber side end portion (54) of the intermediate piece (70), e.g. by welding, is connected. Vienna, on February 20, 2012