Arrangement of a spark plug in a spark plug sleeve made of a metallic material and method for its manufacture

Abstract

Arrangement of a spark plug (8) in a spark plug sleeve (6) made of a metallic material, the sleeve having a cylindrical receptacle (15) extending eccentrically to its outer mounting section for receiving an insulator body (7) of the spark plug (8), resulting in a wall section (17) of the spark plug sleeve (6) with a greater wall thickness, wherein a ground electrode (34) extending from the end face of the spark plug sleeve (6) is provided at a reduced-diameter end of the receptacle (15) and this ground electrode interacts with a central electrode (31) projecting axially beyond the insulator body (7) to generate a spark gap, wherein a fuel channel (14) extends within the wall section (17) with a greater wall thickness, the outlet of which is provided in the spark plug sleeve (6) adjacent to the spark gap, and wherein a check valve (22) is associated with the fuel channel (14), characterized in thatthat the check valve (22) is inserted into the fuel channel (14) from the outlet side and that a magnetically controlled metering valve is integrated into the spark plug sleeve (6) in conjunction with the check valve (22).

Description

Field of invention

[0001] The invention relates to an arrangement of a spark plug in a spark plug sleeve made of a metallic material, which has a cylindrical receptacle extending eccentrically to its outer mounting section for receiving an insulator body of the spark plug, resulting in a wall section of the spark plug sleeve with a greater wall thickness, wherein a ground electrode extending from the end face of the spark plug sleeve is provided at a reduced-diameter end of the receptacle and this electrode interacts with a central electrode projecting axially beyond the insulator body to generate a spark gap, wherein a fuel channel runs within the wall section with a greater wall thickness, the outlet of which is provided in the spark plug sleeve adjacent to the spark gap, and wherein a check valve is associated with the fuel channel.

[0002] The invention further relates to an arrangement of a spark plug in a spark plug sleeve made of a metallic material, which has a cylindrical receptacle extending eccentrically to its outer mounting section for receiving an insulator body of the spark plug, so that a wall section of the spark plug sleeve with a greater wall thickness is formed, a ground electrode is provided at the end face of which this electrode interacts with a central electrode projecting axially beyond the insulator body to generate a spark gap, wherein a fuel channel runs within the wall section with a greater wall thickness, and wherein a supply pipe forming a fuel line, in which a check valve is arranged, is connected at one end to an inlet of the fuel channel.

[0003] The invention also relates to an arrangement of an ignition and injection device consisting of an ignition device and a feed for a gaseous additive in a cylinder head of a reciprocating internal combustion engine, wherein the ignition device designed as a spark plug is arranged in a cylindrical receptacle of a spark plug sleeve made of a metallic material and with its end having a ground electrode and a center electrode projects directly into a combustion chamber of the reciprocating internal combustion engine, and wherein a fuel channel runs inside the spark plug sleeve, extending to its end face facing the combustion chamber.

[0004] Finally, the invention also relates to a method for manufacturing a spark plug sleeve made of a metallic material for an ignition and injection device, the cylindrical receptacle for a spark plug being arranged eccentrically to form a wall section with a greater wall thickness, wherein a fuel channel extending between end faces of the spark plug sleeve extends within this wall section. State of the art

[0005] Optimization potential for combustion engines is largely exhausted, and the exhaust aftertreatment required to comply with legal limits is extremely expensive. On the other hand, it is becoming clear that combustion engines can be partially replaced by electric powertrains in the future. Despite the predicted structural shift from combustion engines to electric motors, it is assumed that a relatively large proportion of vehicles, especially commercial vehicles and construction equipment, will still be equipped with combustion engine drive systems. Therefore, further developments of the combustion engine continue, considering all potential improvements, including those known from the past, such as variable compression. These potential improvements also include lean-burn operation with a version of the gasoline engine known as a "lean burn engine."Furthermore, developments in the hydrogen combustion engine are being carried out, focusing, among other things, on mixture formation. One of these methods is internal mixture formation, in which gaseous hydrogen is injected directly into the combustion chamber under high pressure and the resulting charge mixture is ignited by a spark plug.

[0006] From DE 10 2017 130 984 A1, an arrangement and design of a spark plug, comprising the generic features of claim 1, is known. According to the Fig. In section 4 of this document, which presents the prior art, a spark plug is arranged eccentrically to a spark plug sleeve to create space for the supply of a pre-chamber fluid, which is introduced via a fuel channel with a flow direction F. A check valve is intended to prevent the pressure increase caused by combustion from expelling pre-chamber fluid from the fuel channel against the flow direction F. The pre-chamber fluid is fed into the fuel channel via a feed tube fixed to the spark plug sleeve. The check valve is located inside this feed tube. A flammable gas, such as H2, CH4, and / or fuel, is to be used as the pre-chamber fluid. H2, in particular, is very suitable due to its high diffusion rate, wide flammability limits, and low ignition energy requirement.

[0007] Furthermore, it is from the Fig. 1 and Fig. German patent application DE 38 28 764 A1 discloses an arrangement of a device consisting of an ignition device and a supply for a gaseous additive in the form of hydrogen, located in the cylinder head of a reciprocating internal combustion engine, which corresponds to the preamble of claim 5. A block diagram schematically illustrates the path of the hydrogen, the signal path for controlling an injection valve, and the control of the ignition. In the immediate vicinity of a spark plug electrode, the ignitable hydrogen-air mixture flowing in via a fuel channel is formed and ignited by the spark plug spark, thus initiating combustion. A check valve between a throttle valve and the injection valve is intended to prevent backflow of fresh gas during compression and of exhaust gas during combustion into the hydrogen supply system.In one embodiment, the spark plug is fixed in the cylinder head by means of a spark plug sleeve, referred to as an adapter, with the spark plug sleeve receiving the spark plug via a central receptacle. The hydrogen fuel then flows through a long nozzle with a very small inner diameter to prevent backdraft of the flame into the supply line. The check valve is located at the fuel channel outlet and is designed as a diaphragm reed valve, consisting of a coiled strip of spring steel that acts as a spring and simultaneously serves as a sealing surface at its movable end.

[0008] DE 196 22 945 A1, which probably represents the closest state of the art here, describes a method for operating an internal combustion engine for gaseous fuels.

[0009] DE 10 2014 016 127 A discloses an internal combustion engine, a pre-chamber insert and a fuel injector.

[0010] DE 10 2014 003 558 A1 describes a ring adapter for a spark plug with a housing-integrated spray channel. Disclosure of the invention

[0011] The object of the present invention is to provide a device on a gasoline engine that improves its efficiency and reduces its harmful exhaust gas components, and to provide a space-saving arrangement for this device. Furthermore, the manufacture of such a device is to be improved.

[0012] This problem is solved by the features of the characterizing part of independent claims 1, 2 and 5. Advantageous embodiments are described in claim 4, which is dependent on claim 1.

[0013] The invention relates to an arrangement of a spark plug in a spark plug sleeve made of a metallic material, which has a cylindrical receptacle extending eccentrically to its outer mounting section for receiving an insulator body of the spark plug. This creates a wall section of the spark plug sleeve with a greater wall thickness. Furthermore, a ground electrode extending from the end face of the spark plug sleeve is provided at a reduced-diameter end of the receptacle, and this ground electrode interacts with a center electrode extending from the insulator body to generate a spark gap. A fuel channel runs within the wall section with the greater wall thickness, the outlet of which is provided in the spark plug sleeve adjacent to the spark gap, and a check valve is associated with the fuel channel.

[0014] The check valve is inserted into the fuel channel from the outlet side, and a magnetically controlled metering valve is integrated into the spark plug sleeve in conjunction with the check valve. This results in lower thermal stress on the check valve located in the fuel channel, and the check valve is also not directly exposed to the exhaust gas generated in the combustion chamber during combustion. Furthermore, its placement in the fuel channel from the outlet side significantly simplifies installation. Hydrogen (H2) is particularly suitable as a fuel to be injected into the combustion chamber via the fuel channel due to its high diffusion rate, wide flammability limits, and low ignition energy requirement.

[0015] In the lean burn operation of a reciprocating internal combustion engine, as mentioned earlier, with a very lean fuel / air mixture (lambda > 2), twice as much air is required as for stoichiometric combustion. These lean mixtures cannot be reliably ignited with liquid or gaseous hydrocarbons (e.g., gasoline, natural gas) using a spark plug. Therefore, in this system, an ignition mixture (e.g., hydrogen / air) is advantageously generated spatially as a cloud around the spark plug electrodes (in the spark gap region) by means of the spark plug itself, which engages the fuel channel. This initial flame then propagates as a turbulent flame front within the lean hydrocarbon / air main mixture. The ignition mixture contributes negligibly to the overall energy conversion.

[0016] In contrast to a check valve inserted into the fuel channel from the outlet side, the embodiment described in DE 10 2017 130 984 A1, which is considered prior art, provides for the check valve to be arranged in the feed pipe. In this case, the check valve is inserted into the cross-section of the feed pipe from an inlet side for the fuel.

[0017] The problem is also solved by the fact that the feed tube has a bore section facing the inlet of the fuel channel running through the spark plug sleeve and is radially widened, and that the check valve is inserted into this widened bore section from the end of the widened bore section, and that a magnetically controlled metering valve is integrated into the spark plug sleeve in conjunction with the check valve. The check valve can thus be easily inserted into the widened bore section from the end designated for the corresponding connection before the feed tube is connected to the spark plug sleeve.

[0018] According to a further embodiment of the invention, the check valve shall have a spherical or conical locking element which is acted upon in the closing direction by a valve spring, the valve spring being supported against an annular shoulder of the fuel channel or the fuel line running in the feed pipe. Furthermore, as provided, a valve seat of the check valve, which interacts with the locking element, can be formed directly in the feed pipe at the end of the enlarged bore section.

[0019] The invention further relates to an arrangement of an ignition and injection device, consisting of an ignition device and a feed for a gaseous additive, in a cylinder head of a reciprocating internal combustion engine, wherein the ignition device, designed as a spark plug, is arranged in a cylindrical receptacle of a spark plug sleeve made of a metallic material and projects directly into a combustion chamber of the reciprocating internal combustion engine with its end having a ground electrode and a center electrode. A fuel channel runs within the spark plug sleeve, extending to its end face facing the combustion chamber.

[0020] It is provided that the receptacle is arranged eccentrically in the spark plug sleeve, that the fuel channel runs in a wall section with a greater wall thickness due to the eccentricity of the spark plug arrangement, that a check valve is arranged in an end section of the fuel channel, and that a magnetically controlled metering valve is integrated into the spark plug sleeve in conjunction with the check valve.

[0021] The invention relates to the design of a so-called hydrogen spark plug, the challenge being the very limited installation space of a standard spark plug, into which, in addition to the center electrode, a check valve, cavities, and a gas connection must be integrated. The installation space must not be larger to avoid the need for modifications to existing cylinder heads. Due to the very limited space in the combustion chamber of a gasoline engine for two to four gas exchange valves per cylinder unit, for fresh and exhaust gas channels, and for cooling channels (water, oil) or cooling fins (air), there is no room for a larger spark plug or an additional gas injector.

[0022] The center electrode, consisting of an insulator, electrode, interference suppression resistor, and ignition cable connection, and which can be designed as a standard 10 mm spark plug or even a smaller special spark plug (and is therefore thinner than the center electrode of a 14 mm spark plug), is inserted eccentrically into the spark plug sleeve, which is designed as a metallic threaded body and can have the outer dimensions of a 14 mm spark plug. This eccentric arrangement creates the space for the fuel channel and check valve, the cavity, and the gas connection.

[0023] The check valve is advantageously positioned as close as possible to the gas outlet in the spark plug's breathing chamber to minimize exhaust gas backflow and ensure that only pure hydrogen reaches the check valve. This prevents scavenging and dilution losses of the hydrogen during the initial combustion mixture formation near the spark plug and minimizes hydrogen consumption. Any potential flame front backflow into the fuel channel, breathing chamber / check valve, and then through the check valve into the hydrogen supply line is prevented by the significant cooling of the flame against the component walls. Pure hydrogen is non-flammable. The check valve, with its flow direction towards the combustion chamber, can be designed, for example, as a spring-loaded ball valve.

[0024] Furthermore, in a further development of the spark plug design, in which the check valve is inserted into the fuel channel from the outlet side, a radially enlarged section is provided at the end of the fuel channel to receive a locking element acted upon in the closing direction by a valve spring. The valve spring is supported at its end opposite the locking element by a sealing element fixed in this section. A bore extends from the fuel channel between the locking element and the sealing element, connecting the fuel channel to an annular space formed between the spark plug and the spark plug sleeve. The fuel channel is closed at its fuel-side end by means of a pressed-in ball, which serves as a sealing element and is crimped from the outside.The valve spring of the check valve rests against this ball, with hydrogen being supplied to the combustion chamber via the transverse bore and the annular space. Other valve designs, such as reed valves or diaphragm valves, can also be used as check valves. The gas connection is achieved via a supply tube pressed into the printed spark plug sleeve, or alternatively, glued or soldered in place.

[0025] The standard center electrode, consisting of a ceramic body, electrode, interference suppression resistor, and connection thread, is taken from a standard 10 mm spark plug. It is sealed on the electrode side with a sealing ring and attached on the connection side by crimping the base body. The clamping force (sealing force) between the ceramic body and the base body is generated by a subsequent heat treatment that shrinks the base body.

[0026] Another possible design would be the integration of a magnetically controlled metering valve for hydrogen supply into the check valve and the spark plug body. The spark plug can be connected to the ignition cable and the hydrogen supply via a connector. In this connector, the electrical connection is made via a spring (conventional spark plug connector), and the gas connection is achieved via a sliding fitting with an O-ring seal. The gas supply requires only low pressure, as gas is injected before the ignition point, which occurs before top dead center.

[0027] In order to achieve the most compact design possible for the fuel supply device, a magnetically controlled metering valve required for this purpose is integrated into the spark plug sleeve in conjunction with the check valve according to the invention.

[0028] The invention proposes that, for a spark plug sleeve made of a metallic material of a spark plug assembly, the cylindrical receptacle for a spark plug is arranged eccentrically to form a wall section with a greater wall thickness, wherein a fuel channel extending between end faces of the spark plug sleeve extends within this wall section.

[0029] According to the invention, the spark plug sleeve is manufactured using 3D printing. The freeform outer surfaces, which are easily achieved with 3D printing, prevent the formation of non-functional material accumulations. This results in a lighter spark plug, less material is required, printing time is reduced, and manufacturing costs are minimized. Subsequent heat treatment causes the printed component to shrink by approximately 0.1%. This also reduces residual stresses and increases hardness and strength (hardness approximately 54 HRC, tensile strength approximately 1900 MPa). The material-specific shrinkage is strategically utilized in the manufacturing process to create an additional frictional connection between the crimp and the ceramic insert. This is necessary to achieve a seal between the crimp and the ceramic insert. A geometric feature (shrink zone) is incorporated to facilitate targeted shrinkage.A key advantage of the printing process is the integration of the fuel channel, which cannot be manufactured in this form using conventional methods.

[0030] In contrast, it is generally known to manufacture the spark plug sleeve of commercially available spark plugs using a cold extrusion process in several stages, then to finish it by machining (turning and drilling) and rolling the thread.

[0031] The invention is not limited to the specified combination of features in independent claims 1, 2, and 5 and the dependent claims. Further possibilities exist for combining individual features, particularly when they arise from the claims, the subsequent description of exemplary embodiments, or directly from the figures. Furthermore, the reference in the claims to the figures by means of reference numerals is in no way intended to limit the scope of protection of the claims to the illustrated embodiments. Brief description of the drawing

[0032] For further explanation of the invention, reference is made to the drawings, in which a simplified embodiment is shown without the metering valve. They show: Fig. 1 a schematic representation of a cylinder unit of a reciprocating internal combustion engine with a spark plug associated with it, through whose spark plug sleeve hydrogen is supplied, Fig. 2 a longitudinal section through a complete unit consisting of a spark plug, a spark plug sleeve and a supply tube for hydrogen, wherein a check valve is inserted into a fuel channel from an outlet side therein, Fig. 3 a longitudinal section through a spark plug sleeve produced by 3D printing, Fig. 4 a longitudinal section through the according to Fig. 3 formed spark plug sleeve, after the spark plug has been inserted into it, and Fig. 5 a longitudinal section through a complete unit consisting of a spark plug, a spark plug sleeve and a supply tube for hydrogen supply, wherein a check valve is inserted from one end into an enlarged bore section of the supply tube. Detailed description of the drawing

[0033] In the Fig. 1 is a cylinder head of a reciprocating internal combustion engine, which together with a cylinder liner 2 and a working piston 3 defines a combustion chamber 4. An ignition and injection device 5 is inserted into the cylinder head 1, of which in the Fig. Figure 1 shows a spark plug sleeve 6 and a spark plug 8 having an insulator body 7. Furthermore, it is evident from the Fig. Figure 1 shows that the spark plug 8 is provided at its end with an electrical connection pin 9, via which it can be connected to a spark plug connector (not shown), so that a connection to an electronic ignition system 11 is established via an ignition cable 10 connected to the spark plug connector. Furthermore, the ignition and injection device 5 is connected to a hydrogen storage tank 12 via a control unit (not shown), with a fuel line 13 being connected on one side to the spark plug sleeve 6 and on the other side to the tank 12. A fuel channel 14 extends from the fuel line 13 within the spark plug sleeve 6.

[0034] Such a reciprocating internal combustion engine can be operated in lean burn mode, in which a very lean fuel / air mixture containing liquid or gaseous hydrocarbons (e.g., gasoline, natural gas) is supplied to the combustion chamber 4 for stoichiometric combustion with lambda > 2. In this case, igniting the mixture with a spark presents a challenge. In the arrangement described above, an ignition mixture (for example, a hydrogen / air mixture) is advantageously generated spatially as a cloud around the spark plug electrodes of the spark plug 8 by means of the fuel channel 14 of the ignition and injection device 5 and ignited by its spark plug spark. The ignition mixture ignited in this way produces a turbulent flame front in the lean hydrocarbon / air main mixture.

[0035] From the Fig. 2. The structure of the arrangement follows Fig. 1. The ignition and injection device 5 used is described in detail, which, as previously explained, consists of the spark plug sleeve 6 provided with an external thread 6a and the spark plug 8. A stepped receptacle 15, which in this case is cylindrical, runs inside the spark plug sleeve 6. As can be seen from a longitudinal center axis 16 of this receptacle 15, the receptacle 15 is arranged eccentrically in the spark plug sleeve 6. This creates a wall section 17 of the spark plug sleeve 6 which has a greater wall thickness compared to the other wall sections.

[0036] Within this wall section 17 runs the fuel channel 14, which begins at an upper end face 18 of the spark plug sleeve 6 and ends at its lower end face 19. In the inlet region of the fuel channel 14, its diameter is radially widened, and a feed pipe 20 is pressed into this section. Furthermore, a radial diameter widening 21 is also provided in the outlet end region of the fuel channel 14, which serves to accommodate a check valve 22.

[0037] One end of the diameter extension 21 forms a valve seat 23, which interacts with a spherical locking element 24. The locking element 24 is biased in its closing direction by a valve spring 25, the other end of which rests against a spherical locking element 26. A riving 27, made from the end face 19, secures the locking element 26 in the diameter extension 21.

[0038] The hydrogen supplied via the fuel channel 14 and the check valve 22 enters a bore 29 from a space 28 formed between the locking element 24 and the sealing element 26 and is fed into an annular space 30 located between the spark plug 8 and the spark plug sleeve 6. The hydrogen is then injected into the combustion chamber 4 via this annular space 30 according to... Fig. 1.

[0039] The spark plug 8 essentially consists of a center electrode 31, a spark plug pin 32, and a suppressor resistor 33. These components are enclosed by the insulator body 7. A ground electrode 34 extends from the spark plug sleeve 6, and a spark gap can be generated by the electrical voltage between the center electrode 31 and the ground electrode 34. The spark plug 8 is secured in the spark plug sleeve 6 by a crimp 35.

[0040] In the Fig. Figure 3 shows the spark plug sleeve 6 in its state after manufacturing by a 3D printing process. A number of corresponding spark plug sleeves 6 can be produced by laser beam melting in a powder bed. These individual components are each formed by their extruded edge geometry of the upper end face of the spark plug sleeve 6, which is then, as Fig. Figure 2 shows the component positioned on a build platform when a flange 35 is used. A total of 100 spark plug sleeves 6 can be 3D printed on this build platform in a single batch. After printing, all components are separated from the build platform in parallel, i.e., with a single cut, using wire EDM. This process is followed by heat treatment, which reduces the shrinkage of the printed component by approximately 0.1%. Additionally, the heat treatment reduces residual stresses and increases hardness and strength.

[0041] According to the Fig. In the next step of the manufacturing process, the spark plug 8, with its ceramic insulator body 7, is inserted into the stepped receptacle 15. The spark plug 8 is secured in the spark plug sleeve 6 by means of the crimp 35. Insertion of the spark plug 8 into the receptacle 15 preferably takes place after the heat treatment of the spark plug sleeve 6, while it is still heated. The material-specific shrinkage of the spark plug sleeve 6 is specifically utilized within the manufacturing strategy to create an additional frictional connection between the crimp 35 and the spark plug 8. This is necessary to achieve a seal between the crimp and the insulator body 7.

[0042] During a Fig. In the ignition and injection device 36 shown in Figure 5, which has a spark plug sleeve 37 in which a fuel channel 38 runs, a spark plug 40 having an insulator body 39 is designed, by way of example, as a sliding spark plug 41. In this sliding spark plug 41, the ignition spark does not jump, as in the embodiment according to Figure 5. Fig. 2, directly as an air spark from the center electrode to the ground electrode, which is formed in a U-shape on the spark plug sleeve. Instead, it is a sliding spark that, starting from a center electrode 42, flows along one end of the insulator foot 43 formed on the insulator body 39 to the ground electrode 44. The spark traverses this sliding spark gap by sliding over the surface of the insulator foot 43 and then jumping to the ground electrode 44.

[0043] The spark plug sleeve 37 is provided with an external thread 45, via which it is connected, as in the Fig. 1 shown, into the cylinder head 1 after Fig.1. The spark plug 41 is screw-in. A receptacle 46, which has steps of different diameters and runs eccentrically to the longitudinal center axis of the spark plug sleeve 37, receives the sliding spark plug 41. The fuel channel 38 runs within a wall section 47, which is thicker due to the eccentric design of the spark plug sleeve 37. This channel originates from an upper end face 48 of the spark plug sleeve 37, follows its contour, and finally exits radially via an angled section 49 within an annular space 50, which is bounded internally by the insulator base 43 of the sliding spark plug 41 and externally by the spark plug sleeve 37.

[0044] A feed tube 51 is inserted into the fuel channel 38 at the end face 48 of the spark plug sleeve 37, so that a fuel line 38a running inside the feed tube 51 is connected to the fuel channel 38. The fuel line 38a has a radially enlarged bore section 52 at its end facing the spark plug sleeve 37. This bore section is thus oriented towards the inlet of the fuel channel 38 running in the spark plug sleeve 37. A check valve 53, which has a spherical locking element 54 and a valve spring 55, is inserted into the enlarged bore section 52 from this end. A valve seat 56 of the check valve 53 is formed directly in the feed tube 51 at the transition from the bore section 52 to the normal cross-section of the supply tube 51. Reference symbol list 1 cylinder head 2 cylinder liner 3 working pistons 4 Combustion chamber 5 Ignition and injection device 6 spark plug sleeves 6a External thread of 6 7 insulator bodies 8 spark plug 9 electrical connection bolts 10 ignition cables 11 electrical ignition system 12 Tanks for hydrogen 13 Fuel line 14 Fuel channel 15-stage recording 16 Longitudinal center axis 17 Wall section 18 upper forehead 19 lower forehead 20 Feed pipe 21 Diameter expansion from 14 22 Check valve 23 valve seat of 22 24 locking elements 25 Valve spring 26 Locking element 27 Caulking Room 28 29 bore 30 Ring space 31 Center electrode 32 Ignition pin 33 Interference suppression resistor 34 Ground electrode 35 Flanging 36 Ignition and injection device 37 Spark plug sleeve 38 Fuel channel 38a Fuel line in 51 39 insulator bodies out of 41 40 Spark plug 41 Glide spark plug 42 center electrode of 41 43 insulator foot of 39 44 Ground electrode of 41 45 external threads of 37 46 recording of 37 47 Wall section of 37 48 Front side of 37 49 angled section of 38 50 ring space 51 Feed pipe 52 Drilling section in 51 53 Check valve 54 spherical locking body of 53 55 valve spring of 53 56 valve seat of 53

Claims

Arrangement of a spark plug (8) in a spark plug sleeve (6) made of a metallic material, the sleeve having a cylindrical receptacle (15) extending eccentrically to its outer mounting section for receiving an insulator body (7) of the spark plug (8), resulting in a wall section (17) of the spark plug sleeve (6) with a greater wall thickness, wherein a ground electrode (34) extending from the end face of the spark plug sleeve (6) is provided at a reduced-diameter end of the receptacle (15) and this ground electrode interacts with a central electrode (31) projecting axially beyond the insulator body (7) to generate a spark gap, wherein a fuel channel (14) extends within the wall section (17) with greater wall thickness, the outlet of which is provided in the spark plug sleeve (6) adjacent to the spark gap, and wherein a check valve (22) is associated with the fuel channel (14), characterized in thatthat the check valve (22) is inserted into the fuel channel (14) from the outlet side and that a magnetically controlled metering valve is integrated into the spark plug sleeve (6) in conjunction with the check valve (22). Arrangement of a spark plug (40, 41) in a spark plug sleeve (37) made of a metallic material, which has a cylindrical receptacle (46) extending eccentrically to its outer mounting section for receiving an insulator body (39) of the spark plug (40, 41), resulting in a wall section (47) of the spark plug sleeve (37) with a greater wall thickness, at the end face of which a ground electrode (44) is provided and which interacts with a central electrode (42) projecting axially beyond the insulator body (39) to generate a spark gap, wherein a fuel channel (38) runs within the wall section (47) with a greater wall thickness, and wherein a feed tube (51) forming a fuel line (38a), in which a check valve (53) is arranged, is connected at one end to an inlet of the fuel channel (38), characterized in thatthat the feed pipe (51) has a bore section (52) of the fuel line (38a) which faces the inlet of the fuel channel (38) running in the spark plug sleeve (37) and is radially widened, and that the check valve (53) is inserted into this from the end of the widened bore section (52) and a magnetically controlled metering valve is integrated into the spark plug sleeve (37) in conjunction with the check valve (53). Arrangement of a spark plug according to one of claims 1 or 2, characterized in that the check valve (22, 53) has a spherical or conical locking element (24, 54) which is acted upon in the closing direction by a valve spring (25, 55), wherein the valve spring (25, 55) is supported on an annular shoulder (24, 56) of the fuel channel (14) or the fuel line (38a). Arrangement of a spark plug according to claim 2, characterized in that a valve seat (56) cooperating with a locking element (54) of the check valve (53) is formed directly in the feed tube (51) at the end of the enlarged bore section (52). Arrangement of an ignition and injection device (5) consisting of an ignition device and a feed for a gaseous additive in a cylinder head (1) of a reciprocating internal combustion engine, wherein the ignition device, designed as a spark plug (8), is arranged in a cylindrical receptacle (15) of a spark plug sleeve (6) made of a metallic material and with its end having a ground electrode (34) and a center electrode (31) projects directly into a combustion chamber (4) of the reciprocating internal combustion engine, and wherein a fuel channel (14) runs inside the spark plug sleeve (6) extending to its end face (19) facing the combustion chamber (4), wherein the receptacle (15) is arranged eccentrically in the spark plug sleeve (6), and wherein the fuel channel (14) runs in a wall section (17) which has a greater wall thickness due to the eccentricity of the spark plug arrangement.and wherein a check valve (22) is arranged in an end section of the fuel channel (14) and a magnetically controlled metering valve is integrated into the spark plug sleeve (6) in conjunction with the check valve (22). Arrangement of a spark plug according to one of claims 1, 2 or 5, characterized in that the check valve (22, 53) is designed as a reed valve. Arrangement of a spark plug according to one of claims 1, 2 or 5, characterized in that the check valve (22, 53) is designed as a diaphragm valve. Arrangement of a spark plug according to one of claims 1 or 5, characterized in that, for the formation of the check valve (22), a radially enlarged section (21) is provided at the end of the fuel channel (14) for receiving a locking element (24) acted upon in the closing direction by a valve spring (25), that the valve spring (25) is supported at its end facing away from the locking element (24) on a closing element (26) fixed in the section (21), and that a bore (29) extends from the fuel channel (14) between the locking element (24) and the closing element (26), connecting the fuel channel (14) to an annular space (30) formed between the spark plug (8) and the spark plug sleeve (6). Arrangement according to one of claims 1 to 8, wherein the spark plug sleeve (6) made of a metallic material is manufactured using a 3D printing process.

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