Connection unit

Abstract

The invention relates to a connection unit for connecting a hot gas generation assembly (22) for generating hot gas (H) to be introduced into an exhaust gas flow channel (28) in an exhaust gas guide part (12) to an exhaust gas guide part (12) of an exhaust system (10) for an internal combustion engine, the connecting unit comprises a connecting unit body (36) which is formed in one piece with a peripheral wall (38) surrounding a hot gas flow channel (40), with a fastening region (42) fastened to a component wall (50) of the exhaust gas guiding component (12), and with a connecting region (60) for connecting the hot gas generating assembly (32) to the connecting unit (34), and the connecting unit body (36) is formed in one piece with the peripheral wall (38), with the fastening region (42) being fastened to a component wall (50) of the exhaust gas guiding component (12) and with the connecting region (60) being used for connecting the hot gas generating assembly (32) to the connecting unit (34). According to the invention, the fastening region (42) comprises a fastening flange (56), which projects radially outward from the peripheral wall (38) with respect to the central axis (M) of the connecting unit, and which has an annular fastening surface (58) formed thereon, and the connecting region (60) comprises a connecting flange (62), which projects radially outward from the peripheral wall (38) with respect to the central axis (M) of the connecting unit, the connecting flange has an annular connecting surface (64) formed thereon.

Description

Technical Field

[0001] The invention relates to a connecting unit for connecting a hot gas generating assembly for generating hot gas to be introduced into an exhaust gas flow channel in the exhaust gas guiding component to an exhaust gas guiding component of an exhaust system for an internal combustion engine. Background Art

[0002] In order to reduce the proportion of pollutants in the exhaust gas discharged from an internal combustion engine, exhaust gas treatment units such as catalysts, particle filters, etc. are used in such exhaust gas treatment systems. The treatment process usually includes a catalytic reaction, in order to carry out which the catalyst material of such an exhaust gas treatment unit must be brought to an operating temperature which is usually in the range of several hundred degrees Celsius. In order to keep the duration of the exhaust gas treatment unit, in particular in the initial phase of the operation of the internal combustion engine, during which the catalytic reaction cannot be carried out due to too low a temperature, as short as possible, it is known to equip such an exhaust gas treatment unit with a heating unit, in which the exhaust gas discharged from the internal combustion engine has a relatively low temperature and different system areas of the exhaust gas system also have a relatively low temperature. These heating units can be operated, for example, electrically in order to transfer heat to the exhaust gas discharged from the internal combustion engine or to the air introduced into the exhaust gas system and to transfer this heat to one or more exhaust gas treatment units located further downstream.

[0003] In an alternative design of the heating unit, this heating unit can be designed as a hot gas generating component, which generates exhaust gas used as hot gas in an exothermic reaction, that is, usually in a combustion process or an oxidation process. This exhaust gas can be guided through one or more exhaust gas treatment units in the exhaust system in order to use the heat transported in the hot gas for heating such exhaust gas treatment units. Since the hot gas generated in such a hot gas generating component can have a temperature significantly greater than 1000° C., it is possible to achieve very rapid heating of the exhaust gas treatment unit to the temperature required for carrying out the exhaust gas purification reaction.

[0004] DE901466U1 discloses an exhaust system for an internal combustion engine, which has a hot gas generating assembly for introducing hot gas into the exhaust gas flow of the internal combustion engine. A connecting unit for connecting the hot gas generating assembly to an exhaust gas guiding component of the exhaust system comprises a tubular curved connecting unit body, which is joined to an exhaust pipe providing the exhaust gas guiding component by welding in one of its end regions and carries the hot gas generating assembly including a burner in its other end region, the exhaust pipe also forming an inlet for a catalyst following downstream.

[0005] In an exhaust system for an internal combustion engine known from the German patent application DE102022116939.1 published later, a connecting unit for connecting a hot gas generating component to an exhaust guide component of the exhaust system is assembled from two components. The construction of the connecting unit provides a fixing region for a component of a sheet metal molded part, with which the connecting unit is fixedly joined to the exhaust guide component of the exhaust system by welding. The construction of the connecting unit provides a connecting region for a component of a metal casting, in which the hot gas generating component can be connected to the connecting unit. The two components of the connecting unit are fixedly connected to each other by welding in a connecting region that is essentially cylindrical and arranged to overlap each other. Summary of the invention

[0006] The object of the present invention is to provide a connecting unit that is stable under strong mechanical and thermal loads, which is used to connect a hot gas generating component to an exhaust guide component of an exhaust system for an internal combustion engine, wherein the hot gas generating component is used to generate hot gas to be introduced into an exhaust flow channel in the exhaust guide component.

[0007] According to the present invention, the object is achieved by a connecting unit for connecting a hot gas generating component to an exhaust guide component of an exhaust system for an internal combustion engine, the hot gas generating component for generating hot gas to be introduced into an exhaust gas flow channel in the exhaust guide component, the connecting unit comprising

[0008] The surrounding wall surrounding the hot gas flow channel,

[0009] A fixing region fixed to a component wall of the exhaust gas guide component and

[0010] A connection area for connecting the hot gas generating assembly to the connection unit

[0011] A connecting unit body constructed in one piece, wherein the fixing area includes a fixing flange protruding radially outward from the peripheral wall relative to the central axis of the connecting unit body, and the fixing flange has an annular fixing surface constructed thereon, and the connecting area includes a connecting flange protruding radially outward from the peripheral wall relative to the central axis of the connecting unit body, and the connecting flange has an annular connecting surface constructed thereon.

[0012] The connection unit constructed according to the invention avoids the necessity of assembling separate components that provide a fixing region on the one hand and a connecting region on the other hand to form a connection unit body by means of its one-piece connection unit body. This improves the stability of the connection unit and avoids the risk of damage in the region of such a connection of the separate components due to strong mechanical or thermal loads. Since the corresponding surfaces for fixing or connecting are constructed not only in the fixing region but also in the connecting region on the flanges assigned to these regions, it is possible to connect the connection unit not only in the fixing region to the exhaust guide component but also in the connecting region to the hot gas generation component in a manner that distributes the loads occurring over a large area and evenly. In particular, the connection to the hot gas generation component by means of the connection flange can be reversibly carried out in a simple, low-cost, but still very stable manner and method using a connection collar, also called a V-band, etc.

[0013] It should be pointed out that within the meaning of the present invention, the expression "in one piece" means that the component mentioned above and below is produced as one material block and not by joining separate parts. This can be achieved, for example, by configuring the connecting unit body as a metal casting. The design of the connecting unit body as a metal casting leads to a further advantage: the connecting unit body is designed to be much more stable than, for example, a sheet metal molded part, especially also in its fastening area provided for joining to the exhaust gas conducting component.

[0014] If the connecting surface is arranged substantially orthogonally with respect to the connecting unit body center axis in the upstream end region of the hot gas flow channel, this makes it possible in a simple manner to join the connecting unit to a correspondingly shaped connecting flange of the hot gas generating component in the connecting region.

[0015] If the fastening surface is inclined at an angle different from 90° relative to the central axis of the connecting unit body in the upstream end region of the hot gas flow channel, an angled orientation of the two surfaces relative to one another is achieved, particularly taking into account the orientation of the connecting surface described above, which contributes to a compact design of an exhaust gas system with such a connecting unit and a hot gas generating component. Furthermore, by the angle introduced thereby and the resulting orientation of the hot gas flow channel, it is also possible to introduce the hot gas into the exhaust gas flow in the exhaust gas guide component in a manner that assists in supporting the mixing of the hot gas and the exhaust gas.

[0016] In an advantageous design, it can be provided that the connection surface is substantially in one plane, or / and the fixing surface is substantially in one plane. In this case, the corresponding surface is configured as a substantially uncurved surface, which, on the one hand, simplifies the manufacture of the connection unit body providing this surface and the components to be connected to the connection unit body, and on the other hand, simplifies the process for connecting the connection unit body to these components.

[0017] In order to keep both thermal and mechanical loads as low as possible in the region where the connecting unit body is fastened to the exhaust gas guide component, it is proposed that the radial distance of the peripheral wall from the central axis of the connecting unit increases from the connecting flange in the direction of the fastening flange, or / and the connecting surface is smaller than the fastening surface. Since in the region of the fastening surface or the fastening flange having this fastening surface, on the one hand, mechanical loads applied by the hot gas generating component are transferred to the exhaust gas guide component, and on the other hand, relatively strong thermal loads may occur, in particular by hot gas, it is particularly advantageous to introduce a load distribution over the largest possible area as the size of the peripheral wall or the larger fastening surface in the region where the connecting unit is joined to the exhaust gas guide component increases.

[0018] The defined introduction of hot gas into the exhaust gas flow while reducing the thermal load can be achieved, for example, by providing a hot gas introduction pipe on the connecting unit body which is connected to the peripheral wall or / and at least partially surrounded by the peripheral wall and at least partially provides the hot gas flow channel.

[0019] Here, if the connecting unit body is constructed in one piece with the hot gas inlet pipe, a simple and stable structure can also be achieved. This means that essentially all components of the connecting unit body, namely the peripheral wall, the fixing area, the connecting area and the hot gas inlet pipe, are provided as an integrally structured material block.

[0020] In order to discharge the hot gas in a manner that assists the mixing with the exhaust gas, a plurality of hot gas discharge openings may be formed in the hot gas inlet pipe.

[0021] The invention also relates to an exhaust device for an internal combustion engine, the exhaust device comprising:

[0022] an exhaust-gas-conducting component having a component wall which delimits an exhaust-gas flow duct through which the exhaust gas of the internal combustion engine can flow,

[0023] - a hot gas generating assembly for generating hot gas to be introduced into the exhaust gas flow channel,

[0024] A connecting unit constructed according to the invention, which is used to connect the hot gas generating assembly to the component wall so that the hot gas generated by the hot gas generating assembly flows into the exhaust gas flow channel through the connecting unit.

[0025] In order to stably support the connecting unit on the component wall, it is proposed that the fastening region is arranged with its fastening surface covering an opening edge region of the component wall surrounding a hot gas inlet opening in the component wall.

[0026] The fixed connection of the connecting unit to the exhaust gas conducting component or to its component wall can be achieved, for example, in that the fastening flange is connected to the component wall by a material fit, preferably welding.

[0027] The component wall can comprise, for example, a sheet-steel profile, as is often the case for exhaust-gas-conducting components in exhaust systems, also for cost reasons.

[0028] The exhaust gas guiding component may, for example, provide a deflection housing for deflecting the exhaust gas flow flowing through the exhaust gas flow channel between its upstream connection area and downstream connection area. In order to also realize the function of exhaust gas purification in the exhaust gas device, it may be further provided that the exhaust gas guiding component is connected to the upstream exhaust gas treatment unit in the upstream connection area and is connected to the downstream exhaust gas treatment unit in the downstream connection area. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention is described in detail below with reference to the accompanying drawings.

[0030] Figure 1 A schematic diagram shows an exhaust device having a hot gas generating component and a connecting unit connecting the hot gas generating component to an exhaust gas guide component;

[0031] Figure 2 shows a perspective view of an exhaust gas guide component with a connecting unit arranged thereon,

[0032] Figure 3 A cross-sectional view showing an exhaust guide component having a connection unit disposed thereon;

[0033] Figure 4 shows a side view of the connection unit;

[0034] Figure 5 A longitudinal section through a connecting unit is shown. DETAILED DESCRIPTION

[0035] exist Figure 1 1 shows in principle an exhaust system 10 or a part of such an exhaust system 10, in which the internal combustion engine exhaust gas A discharged by the internal combustion engine flows. In the design example shown, the exhaust system 10 comprises an exhaust gas guide component 12 which is designed as a deflection housing, such as Figure 1 To illustrate this, the flow of the internal combustion engine exhaust gas A is turned by approximately 180° in the exhaust gas guiding component. In the upstream connecting region 14 of the exhaust gas guiding component 12, an upstream exhaust gas treatment unit 16 is connected to this exhaust gas guiding component. In the downstream connecting region 18 of the exhaust gas guiding component 12, a downstream exhaust gas treatment unit 20 is connected to this exhaust gas guiding component.

[0036] The upstream exhaust gas treatment unit 16 may include, for example, a catalyst, such as an oxidation catalyst and / or a particle filter, which is carried in a tubular exhaust gas treatment unit housing 22. The downstream exhaust gas treatment unit 20 may include, for example, one or more catalysts, such as an SCR catalyst, which are carried in an exhaust gas treatment unit housing 24. In this case, for example, an injector 26 may be provided in the region of the exhaust gas guide component 12 where the deflection housing is provided, which injector discharges a reaction medium R, such as a urea / water solution, into an exhaust gas flow channel 28 provided in the exhaust gas guide component 12. The reaction medium R is mixed with the internal combustion engine exhaust gas A and flows together with the internal combustion engine exhaust gas A in the direction of the downstream exhaust gas treatment unit 20 in order to implement a selective catalytic reduction that causes a reduction in the nitrogen oxide content.

[0037] The exhaust system 10 further comprises a hot gas generating assembly 32, which comprises a burner 30. The burner 30 is supplied with combustion air and fuel, for example diesel or gasoline. During the combustion, i.e. the exothermic reaction, combustion exhaust gas is generated, which is introduced as hot gas H via a connecting unit 34 into the exhaust gas flow channel 28 provided in the exhaust gas guide component 12. The hot gas H can have a temperature of up to 1200° C. and thus contributes to very rapid heating of downstream system regions of the exhaust system 10, in particular the downstream exhaust gas treatment unit 20.

[0038] Reference below Figure 2 and Figure 3 In particular, the structure of the connecting unit 34 is described, which is subjected to high thermal loads due to the very high temperature of the hot gas H on the one hand and to high mechanical loads due to the mechanical coupling of the hot gas generating component 32 to the exhaust gas conducting component 12 in such a way as to provide this temperature.

[0039] exist Figure 2 and 3 It is explained in the figure that the connecting unit 34 is manufactured in one piece, that is, as a material block, for example, as a metal casting by a casting method. The connecting unit body 36 of the connecting unit 34 includes a peripheral wall 38, which is substantially longitudinally extended in the direction of the connecting unit body center axis M and surrounds the hot gas flow channel 40. The peripheral wall 38 transitions into a fixing region 42 in one of its axial end regions, with which the connecting unit 34 is fixed to the exhaust gas guide component 12.

[0040] Figure 2 and 3 It is shown that the exhaust gas guide component 12 designed as a deflection housing can be formed, for example, with two housing parts 44, 46 designed as sheet metal parts. The upstream connection area 14 and the downstream connection area 16 are arranged on the housing part 46. On the other housing part 44, the injector 26 can be mounted in the area of ​​the injector opening 48 provided for this purpose.

[0041] The housing part 44 provides a component wall 50, in which a hot gas inlet opening 52 is formed. The hot gas inlet opening 52 is surrounded by an opening edge region 54 that is substantially planar, i.e., in one plane, on which a fixing flange 56 of the fixing region 42 that protrudes radially outward relative to the peripheral wall 38 rests with a fixing surface 58. The fixing surface 58 surrounds the connecting unit body center axis M in an annular manner and is preferably also substantially in one plane, i.e., is a substantially unbent surface, with which the fixing flange 56 rests on the opening edge region 54 without interruption in the circumferential direction around the hot gas inlet opening 52. The fixed connection of the connecting unit 34 to the housing part 44 of the exhaust gas guide component 12 is achieved in the following manner, i.e., a welded connection that completely surrounds the fixing flange 56 or is completely guided along the fixing flange 56 in the circumferential direction is produced, for example. The fact that the fixing surface 58 on the one hand and the opening edge region 54 on the other hand are substantially unbent, in one plane, provides, in particular, a relatively easy manufacturability of the connecting unit 34.

[0042] At its axial end region remote from the fixing region 42, the peripheral wall 38 of the connecting unit body 36 transitions into a connecting flange 62 in a connecting region 60. The connecting flange 62 provides a connecting surface 64 that completely and annularly surrounds the central axis M of the connecting unit body. The connecting surface 64 is preferably arranged in a plane orthogonal to the central axis M of the connecting unit body and is thus also a substantially unbent surface, on which the mating connecting flange 66 arranged on the hot gas generating component 32 can be positioned close. In order to stably join the hot gas generating component 32, the connecting flange 62 and the mating connecting flange 66 can be fixedly and gas-tightly connected to each other by a connecting collar that is constructed as a so-called V-band and surrounds the V-band radially on the outside. For example, the gas-tight connection can also be supported by a high-temperature resistant sealing element positioned in the region of the two flanges 62, 66.

[0043] exist Figure 4 and Figure 5 It can be seen that the fixing flange 56 together with the fixing surface 58 arranged thereon and the connecting flange 62 together with the connecting surface 64 arranged thereon are at an angle to each other. This means that the fixing flange 56 or the fixing surface 58 is arranged at an angle different from 90° relative to the central axis of the connecting unit body. In addition, it can be seen that the peripheral wall 38 has a spacing from the central axis M of the connecting unit body between the connecting flange 62 and the fixing flange 56 that increases in the downstream direction, that is, in the direction of the fixing flange 56. This has the result that the connecting surface 64 is smaller than the fixing surface 58 at a greater distance from the central axis M of the connecting unit body. This leads to a better load distribution in the connection area where the connecting unit 34 is joined to the component wall 50 and also to heat release.

[0044] Furthermore, the connecting unit 34 comprises a hot gas introduction pipe 68 which, in a particularly preferred embodiment, also forms an integral component of the connecting unit body 36. This hot gas introduction pipe is connected to the peripheral wall 38 in the extension region of the peripheral wall 38 between the connecting flange 62 and the fixing flange 56 and continues the hot gas flow channel 40 formed in the connector body 34. As a result, the hot gas flow channel 40 is substantially directly surrounded and delimited by the peripheral wall 38 in its upstream region and is surrounded by the peripheral wall 38 which also surrounds the hot gas introduction pipe 68 in its downstream region formed in the hot gas introduction pipe 68, but is delimited by this peripheral wall 38. The hot gas introduction pipe 68 can be slightly curved, for example, in the region in which it extends beyond the peripheral wall 38, which results in a structure in which the connecting unit body center axis M also has a substantially curved course.

[0045] A plurality of hot gas outlet openings 70 are formed in the hot gas inlet pipe 68, through which the hot gas H leaving the hot gas generating assembly 32 as exhaust gas from the hot gas generating assembly enters the exhaust gas flow channel 28 within the exhaust gas guide component 12. The positioning of the hot gas outlet openings 70 on the hot gas inlet pipe 68 is preferably selected in such a way that an effective and uniform mixing of the hot gas H and the exhaust gas A in the exhaust gas flow channel 28 is achieved. For this purpose, the downstream end of the hot gas inlet pipe 68 can also be completely or substantially completely closed by an end wall 72, for example, so that it is ensured that substantially no hot gas H exits the hot gas inlet pipe 68 as a relatively strongly focused, hot hot gas flow and enters the downstream connecting region 18 itself. As a result, a relatively uniform flow of the hot gas H or the exhaust gas A mixed with the hot gas H to the downstream exhaust gas treatment unit 20 is achieved, and local overheating of the downstream exhaust gas treatment unit 20 is avoided.

[0046] Since the hot gas H can have a relatively high temperature of up to 1200° C., the connecting unit 34 is preferably made of a material that is stable and also chemically resistant at such high temperatures. Particularly suitable for this purpose are nickel-containing materials, for example nickel-based alloys sold under the registered trademark Inconel.

[0047] In the construction according to the invention, the thermal load is reduced, in particular, also in the region where the connecting unit 34 is connected to the exhaust gas guiding component 12 by virtue of the fact that this region of the connecting unit 34, which is essentially provided by the fastening region 42 or the fastening flange 56, is not directly or only to a small extent directly loaded by the relatively hot hot gas H due to the radial widening of the structure of the circumferential wall 38 and due to the arrangement of the hot gas inlet pipe 68. In this region, the hot gas H is guided at a considerable distance from the fastening surface 58 or the opening edge region 54, so that the welded connection formed in this region between the connecting unit 34 and the exhaust gas guiding component 12, which is preferably designed as a sheet metal molded part at least in this region, is also not subjected to excessively high thermal loads. At the same time, the forces to be transmitted in this region between the connecting unit 34 and the exhaust gas guiding component 12 are distributed over a relatively large area, so that the loads, which are also generated, for example, by the deadweight of the hot gas generating component 32 and applied to the connecting unit 34 via the connecting region 60, are introduced into the exhaust gas guiding component 12 over a larger surface area and thus also mechanical overloads in this region are avoided.

[0048] Finally, it should be pointed out that if the exhaust gas conducting component is structured differently, for example in a tubular form, and the spatial arrangement of the exhaust gas treatment unit and the connecting unit is different from that in the Figure 1 The principle of the invention can also be applied when different locations are selected as illustrated in the design example shown in the figure. The introduction of hot gas H can be carried out, for example, at the following position, which is upstream relative to all exhaust gas treatment units, especially their catalytic effect. If the exhaust gas treatment unit includes, for example, an SCR catalyst and in this regard it is also necessary to introduce a reactant R into the exhaust gas flow, the injector provided for this purpose can also be positioned at another position different from that shown in the figure. This injector can also be positioned downstream relative to the connecting unit, for example. This also makes it possible to heat the mixer assigned to the injector by the hot gas H, which is supposed to assist in the mixing of the reactant and the exhaust gas of the internal combustion engine, and thereby assist in the evaporation of the reactant R.

Claims

1. A connecting unit for connecting a hot gas generating component (22) to an exhaust guide component (12) of an exhaust device (10) for an internal combustion engine, the hot gas generating component for generating hot gas (H) to be introduced into an exhaust gas flow channel (28) in the exhaust guide component (12), the connecting unit comprising: a peripheral wall (38) surrounding the hot gas flow channel (40), a fastening region (42) fastened to a component wall (50) of the exhaust gas guide component (12), and A connection area (60) for connecting the hot gas generating assembly (32) to the connection unit (34) A connecting unit body (36) constructed in one piece, wherein: The fixing area (42) includes a fixing flange (56) protruding radially outward from the peripheral wall (38) relative to the central axis (M) of the connecting unit body, and the fixing flange has an annular fixing surface (58) constructed thereon, and the connecting area (60) includes a connecting flange (62) protruding radially outward from the peripheral wall (38) relative to the central axis (M) of the connecting unit body, and the connecting flange has an annular connecting surface (64) constructed thereon.

2. The connection unit according to claim 1, characterized in that: The connecting unit body (36) is constructed as a metal casting body.

3. The connection device according to claim 1 or 2, characterized in that: The connection surface (64) is arranged substantially orthogonally relative to the central axis (M) of the connection unit body in the upstream end region of the hot gas flow channel (40), or / and the fixing surface (58) is inclined at an angle different from 90° relative to the central axis (M) of the connection unit body in the upstream end region of the hot gas flow channel (40).

4. The connection unit according to any one of claims 1 to 3, characterized in that: The connection surface (64) lies substantially in one plane and / or the fastening surface (58) lies substantially in one plane.

5. The connection unit according to any one of claims 1 to 4, characterized in that The radial distance between the peripheral wall (38) and the central axis (M) of the connection unit increases from the connection flange (62) toward the fixing flange (56), or / and the connection surface (64) is smaller than the fixing surface (58).

6. The connection unit according to any one of claims 1 to 5, characterized in that: The connection unit body (36) is provided with a hot gas introduction pipe (68) which is connected to the peripheral wall (38) or / and is at least partially surrounded by the peripheral wall (38) and at least partially provides the hot gas flow channel (40).

7. The connection unit according to claim 6, characterized in that: The connection unit body (36) and the hot air introduction pipe (68) are integrally constructed.

8. The connection unit according to claim 6 or 7, characterized in that: A plurality of hot gas outlet openings (70) are formed in the hot gas inlet pipe (68).

9. An exhaust device for an internal combustion engine, the exhaust device comprising: an exhaust gas-conducting component (12) having a component wall (50) which delimits an exhaust gas flow channel (28) through which exhaust gas (A) of an internal combustion engine can flow, - a hot gas generating assembly (32) for generating hot gas (H) to be introduced into the exhaust gas flow channel (28), - A connecting unit (34) according to any one of claims 1 to 8, wherein the connecting unit is used to connect the hot gas generating component (32) to the component wall (50), so that the hot gas (H) generated by the hot gas generating component (32) flows into the exhaust gas flow channel (28) through the connecting unit (34).

10. The exhaust device according to claim 9, characterized in that The fixing region (42) is arranged with its fixing surface (58) to cover an opening edge region (54) of the component wall (50) surrounding a hot gas inlet opening (52) in the component wall (50).

11. The exhaust device according to claim 9 or 10, characterized in that: The fastening flange (56) is connected to the component wall (50) by a material bond, preferably by welding.

12. The exhaust device according to any one of claims 9 to 11, characterized in that: The component wall (50) comprises a sheet steel profile.

13. The exhaust device according to any one of claims 9 to 12, characterized in that: The exhaust gas guiding component (12) provides a deflection housing for deflecting the exhaust gas flow flowing through the exhaust gas flow channel (28) between its upstream connecting area (14) and downstream connecting area (18), or / and the exhaust gas guiding component (12) is connected to an upstream exhaust gas treatment unit (16) in the upstream connecting area (14) and is connected to a downstream exhaust gas treatment unit (20) in the downstream connecting area (18).

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