Exhaust treatment assembly

Abstract

The invention relates to an exhaust treatment assembly for an exhaust system of an internal combustion engine, comprising a housing having a circumferential wall and at least one bottom wall connected to the circumferential wall, at least one exhaust treatment unit being positioned in the housing interior space enclosed by the circumferential wall and the bottom wall in a manner detachable from the housing, at least one bottom wall being a replacement bottom wall which is releasably connected to the circumferential wall by means of a connecting device, said connecting device comprising on the circumferential wall a first connection section extending essentially in the direction of the longitudinal axis of the housing and a first axial support section extending radially inwards, and said connecting device comprising on the replacement bottom wall a second connection section extending essentially in the direction of the longitudinal axis of the housing radially adjacent to the first connection section and being releasably connected to the first connection section by means of at least one connection mechanism and a second axial support section extending radially inwards and supported on the first axial support section in the direction of the longitudinal axis of the housing.

Description

Technical Field

[0001] This invention relates to an exhaust treatment assembly for an exhaust system of an internal combustion engine. Background Technology

[0002] Especially in exhaust treatment units constructed for commercial vehicles or heavy-duty trucks, one or more exhaust treatment units are typically arranged within a housing, allowing exhaust gases to flow through them in parallel or in series. Such exhaust treatment units generally comprise a porous matrix, or a matrix with flow channels, received within a tubular sleeve by means of a support liner constructed of fibrous material. This matrix is ​​composed of and / or coated with a catalytically active material. Since the effectiveness of this material decreases during the operational lifespan of the exhaust treatment unit, it is necessary to replace the exhaust treatment assembly contained in the exhaust system or the exhaust treatment units contained within such an assembly in order to provide a sufficient reduction in contaminants contained in the exhaust gases. Particularly when such an exhaust treatment assembly is constructed with a housing surrounding the internal space of the housing containing the exhaust treatment units (the housing having circumferential walls and bottom walls fixed to these circumferential walls by welding at both ends), access to the exhaust treatment units contained within the housing's internal space is only possible in such a costly operational process that one of the bottom walls is separated from the circumferential wall and then fixed back to the circumferential wall by welding after replacing one or more used exhaust treatment units with a new one. Summary of the Invention

[0003] The objective of this invention is to provide an exhaust treatment assembly for an exhaust system of an internal combustion engine, wherein one or more exhaust treatment units housed in the exhaust treatment assembly can be easily replaced without requiring extensive use of working equipment.

[0004] According to the invention, the task is accomplished by an exhaust treatment assembly for an exhaust system of an internal combustion engine. The exhaust treatment assembly includes a housing having a circumferential wall extending longitudinally along the housing's longitudinal axis and at least one bottom wall connected to the circumferential wall in an outer peripheral region. At least one exhaust treatment unit is positioned detachably from the housing within an internal space defined by the circumferential wall and the at least one bottom wall. The at least one bottom wall is a replaceable bottom wall detachably connected to the circumferential wall by means of a connecting device. The connecting device on the circumferential wall includes a first connecting section extending substantially along the housing's longitudinal axis and a first axial support section extending radially inward relative to the first connecting section. The replaceable bottom wall includes: a second connecting section radially adjacent to the first connecting section, preferably extending substantially along the housing's longitudinal axis within the radially inward region of the first connecting section, and detachably connected to the first connecting section by means of at least one connecting mechanism; and a second axial support section extending radially inward relative to the second connecting section and supported on the first axial support section along the housing's longitudinal axis.

[0005] In the exhaust treatment assembly constructed according to the invention, the interaction of the two axial support sections ensures a predetermined, defined positioning of the replacement bottom wall along the longitudinal axis of the housing. Therefore, after replacing one or more exhaust treatment units, the replacement bottom wall can be easily and practically positioned on the circumferential wall without the use of tools. If this positioning is achieved, a fixed connection of the replacement bottom wall to the circumferential wall can be created using typically multiple connecting mechanisms, for example, without necessarily requiring welds that also ensure an airtight seal.

[0006] In order to achieve a stable and as uniform as possible connection across the entire perimeter between the circumferential wall and the replacement bottom wall, it is recommended that the first connection section and / or the second connection section be configured to form an annular shape surrounding the longitudinal axis of the housing.

[0007] In the first connecting section, multiple first connecting mechanism through openings arranged at intervals around and / or along the longitudinal axis of the housing in the circumferential direction can be provided. Similarly, in the second connecting section, multiple second connecting mechanism through openings arranged at intervals around and / or along the longitudinal axis of the housing in the circumferential direction can be provided. Therefore, the replacement bottom wall connected to the circumferential wall can provide multiple pairs consisting of first and second connecting mechanism through openings, respectively. To securely connect the replacement bottom wall to the circumferential wall, each of these pairs is preferably passed through by a connecting mechanism.

[0008] The quick, yet still stable, connection structure for replacing the bottom and circumferential walls can be achieved by using at least one connection mechanism, preferably each connection mechanism including a bolt, and / or at least one connection mechanism, preferably each connection mechanism including a rivet. While bolts can be reused when using them, using rivets as the connection mechanism requires breaking the rivet to loosen the connection structure. However, this does not damage the structure of the connected section and is a significantly simpler and faster process compared to separating a fully circumferential weld.

[0009] The first axial support section can be constructed in a ring shape, so that the first axial support section covers the replacement bottom wall with its ring structure essentially only in its radially outer region.

[0010] To achieve an airtight seal of the internal space of the housing, a first axial support section can be connected to a first connecting section in a first transition region providing the sealing element-receiving forming portion. A sealing element that annularly surrounds the longitudinal axis of the housing can be arranged in the sealing element-receiving forming portion, and in the case of compression of the sealing element, the bottom wall, especially along the longitudinal axis of the housing, can be supported on this sealing element.

[0011] In order to construct the connection device independently of the circumferential wall of the housing, the connection device may include a connection element fixed to the circumferential wall, providing a first connection section and a first axial support section, the connection element having, for example, an L-shaped longitudinal section structure relative to the longitudinal axis of the housing.

[0012] In a simple, stable, and vent-resistant structure, the connecting element can be constructed as a sheet metal part. To ensure a stable connection between the connecting element and the circumferential wall, it is recommended that the connecting element be inserted into the axial end region of the circumferential wall as a portion of a first connecting section and a first axial support section, or / and that the connecting element be connected to the circumferential wall by material locking, preferably welding or brazing.

[0013] The second axial support section can be provided by a radially outer section of the bottom region of the replaceable bottom wall. Here, for stable support interaction, the radially outer section of the bottom region can be arranged to extend substantially radially. In order to close the internal space of the shell along the longitudinal axis of the shell with the help of the replaceable bottom wall under defined flow guidance, the section of the bottom region connected to the radially outer section of the bottom region is preferably constructed in an arched shape in a direction away from the internal space of the shell.

[0014] The second axial support section can be connected to the second connecting section in a second transition region, wherein the second transition region comprises a transition section that is radially offset, preferably radially inward offset, relative to the second connecting section, and extends substantially along the longitudinal axis of the housing at a radially spaced distance from the first connecting section. This design is particularly advantageous because the transition section is positioned in an axial region where the connecting elements of the first connecting section and the first axial support section are provided to the circumferential wall, for example, by welding. Therefore, minor shape deviations that may be introduced by welding will not affect the positioning of the replacement bottom wall.

[0015] To achieve a simple structure, the second connecting section and the second axial support section can be set on the first bottom element of the replacement bottom wall.

[0016] Furthermore, the first bottom element can be constructed as a sheet metal part. In order to achieve thermal shielding of the exhaust gas flowing in the internal space of the housing with respect to relative heat in the area where the bottom wall is replaced, a second bottom element can be arranged on the side of the second axial support section opposite to the internal space of the housing, defining an insulating volume together with the first bottom element, the insulating volume preferably being filled with insulating material.

[0017] When the second bottom element is connected to the first bottom element in the transition section, this connection will not affect the precise positioning of the replacement bottom wall.

[0018] In order to define and position one or more exhaust treatment units within the internal space of the housing, at least one intermediate wall, preferably multiple intermediate walls arranged sequentially along the longitudinal axis of the housing, may be provided within the internal space of the housing. Each intermediate wall, preferably at least one exhaust treatment unit, preferably each exhaust treatment unit has an exhaust treatment unit through-opening that is connected to the exhaust treatment unit, and / or at least one exhaust treatment unit, preferably each exhaust treatment unit, is detachably fixed to at least one intermediate wall, preferably detachably fixed to the intermediate wall closest to the replacement bottom wall positioning.

[0019] The present invention also relates to an exhaust system for an internal combustion engine, for example, in a passenger car, commercial vehicle or truck, the exhaust system having at least one exhaust treatment component constructed according to the present invention. Attached Figure Description

[0020] The present invention will now be described in detail with reference to the accompanying drawings. In the drawings:

[0021] Figure 1 The exhaust treatment assembly for an exhaust system used in an internal combustion engine is shown in a schematic longitudinal sectional view.

[0022] Figure 2 A magnified schematic diagram is shown. Figure 1 Details II. Detailed Implementation

[0023] exist Figure 1 The exhaust treatment assembly, shown in a schematic longitudinal section, is generally designated 10. The exhaust treatment assembly 10 can provide part of the exhaust system for an internal combustion engine in a vehicle, generally designated 12, and includes a housing 14 extending longitudinally along the housing's longitudinal axis L. This housing has, for example, a substantially cylindrical circumferential wall 16 surrounding the housing's longitudinal axis L, and bottom walls 18 or 20 at two axial end regions of the circumferential wall 16. In the illustrated design example of the exhaust treatment assembly 10, exhaust gas discharged from the internal combustion engine can flow, for example, through an opening constructed in the bottom wall 20 toward a first exhaust treatment unit 22 and through the housing's internal space 24 within the housing 14 through the exhaust treatment unit 22. Exhaust gas discharged from the first exhaust treatment unit 22 near the bottom wall 18 is deflected by the bottom wall 18 and reaches the region of a second exhaust treatment unit 26. After also flowing through the second exhaust treatment unit 26, the exhaust gas treated in the exhaust treatment assembly 10 can exit the exhaust treatment assembly 10 through an opening constructed in the bottom wall 20 and flow to other system regions of the exhaust system 12.

[0024] The two exhaust treatment units 22 and 26 are supported on the housing 14 by intermediate walls 28 and 30 arranged axially spaced apart from each other in the internal space 24 of the housing. Each intermediate wall 28 and 30 may have exhaust treatment unit through openings 32, 34, 36, and 38 corresponding to each exhaust treatment unit 22 and 26, through which the corresponding exhaust treatment unit 22 or 24 passes.

[0025] Each exhaust treatment unit 22, 26 can be configured as a so-called cylindrical component and includes a generally cylindrical or sleeve-shaped housing 39 having, for example, an integral matrix 40 supported therein using a fiber pad or the like. The matrix 40 is generally configured to be porous, allowing exhaust gas to pass through it, and is constructed at least on its surfaces that interact with the exhaust gas with a catalytically active material. For example, such an exhaust treatment unit can be configured as a particulate filter, an oxidation catalyst, or an SCR catalyst, or function as such a particulate filter, oxidation catalyst, or SCR catalyst.

[0026] exist Figure 1 In the structure of the exhaust treatment assembly 10 shown, for example, the bottom wall 20 shown on the right side can be fixedly connected to the circumferential wall 16, for example, by welding. Figure 1The bottom wall 18 shown on the left can be a replaceable bottom wall 42, which can be relatively easily removed from the housing 14 or the circumferential wall 16 of the housing in a manner described below, thereby enabling access to the housing interior space 24 and the exhaust treatment units 22, 26 arranged within the housing interior space. Therefore, it is feasible to remove one or both of the exhaust treatment units 22, 26 from the housing interior space 24 after removing the replaceable bottom wall 42 and replace them with new, unused exhaust treatment units 10 that are therefore more effective in reducing the content of harmful substances in the exhaust. For this purpose, the exhaust treatment units 22, 26 can be removably secured, for example by threaded connections or similar means, to the area of ​​the intermediate wall 30 closest to the location of the replaceable bottom wall 42, so that the exhaust treatment units 22, 26 can be removed by simply loosening such connections without extensive tooling, or the exhaust treatment units 22, 26 can be arranged again in a stable and defined position within the housing interior space 24 in the same manner.

[0027] In particular, regarding the replacement of the bottom wall reference 42 Figure 2 Before describing the structure of the exhaust treatment assembly 10 in more detail, it should be noted that the exhaust treatment unit 10 is in Figure 1 The schematic structure shown and described above should be considered exemplary only in relation to the arrangement of one or more exhaust treatment units 22, 26. In an alternative design, the exhaust gas to be treated may flow parallel through the two exhaust treatment units 22, 26, such that the exhaust gas flows, for example, via the bottom wall 20 toward the two exhaust treatment units 22, 26 and, after flowing through the two exhaust treatment units, via... Figure 1 The opening (not shown) exits the internal space 24 of the housing. More than two exhaust treatment units may be provided, or a single exhaust treatment unit may be provided. The two exhaust treatment units 22 and 26 may also be arranged sequentially along the longitudinal axis L of the housing. Here, for example, the exhaust treatment unit further away from the replacement bottom wall 42 can be held on the housing 14 by the exhaust treatment unit closer to the replacement bottom wall 42, while the exhaust treatment unit closer to the replacement bottom wall 42 can be loosely fixed to the intermediate wall positioned closest to the replacement bottom wall 42 in the manner described above, for example, by threaded connection or similar means.

[0028] Figure 2 The axial end region 44 of the circumferential wall 16 of the housing 14 is shown. In the region of the axial end region 44, the replacement bottom wall 42 is detachably connected to the circumferential wall 16 by means of a connecting device generally indicated by 46.

[0029] The connecting device 46 includes, for example, a connecting element 48 configured as a sheet metal form, annularly surrounding the longitudinal axis L of the housing. The connecting element provides a first connecting section 50 through a substantially cylindrical region extending along the longitudinal axis L of the housing. In a first transition region 52, a first axial support section 54 of the connecting element 48 or connecting device 46 is connected to the first connecting section 50. The first axial support section 54 extends substantially radially toward the longitudinal axis L of the housing and is preferably configured in an annular shape, thereby providing stable, defined axial support for replacing the bottom wall 42 over the entire periphery of the housing 14.

[0030] The first transition region 52 forms a sealing element-receiving forming portion 56, which extends a first axial support section 54 toward the internal space 24 of the housing. A sealing element 58, for example configured as an O-ring, is received in the sealing element-receiving forming portion 56 and completely surrounds the longitudinal axis L of the housing and is therefore held radially inward in a defined position.

[0031] The connecting element 48 is inserted into the axial end region 44 of the circumferential wall 16 with a portion of its first connecting section 50, first transition region 52, and first axial support section 54. The connecting element 48 is stably and hermetically connected to the circumferential wall 16 by a weld 60, preferably circumferentially surrounding it.

[0032] The connecting device 46 includes a second connecting section 62 on the replacement bottom wall 42, which is substantially cylindrical in shape and surrounds the longitudinal axis L of the housing. The second connecting section 62 is located radially inside the first connecting section 50 and can be sized, for example, such that there is a minimum possible radial clearance between the first connecting section 50 and the second connecting section 62.

[0033] In their longitudinal sections that overlap each other in the axial and circumferential directions, the first connecting section 50 and the second connecting section 62 respectively have a first connecting mechanism through-opening 64 and a second connecting mechanism through-opening 66. For example, the arrangement can be such that the first connecting mechanism through-openings 44 in the first connecting section 50 are arranged sequentially at preferably substantially equal distances from each other in the circumferential direction around the longitudinal axis L of the housing, and the second connecting mechanism through-openings 66 in the second connecting section 62 of the replacement bottom wall 42 are also arranged sequentially in the same pattern in an annular structure around the longitudinal axis L of the housing. Thus, the overlapping first connecting mechanism through-openings 64 and second connecting mechanism through-openings 66 form a pair, and the connecting mechanism 68, shown only in principle, can be guided through the first and second connecting mechanism through-openings to secure the replacement bottom wall 42. For example, the connecting mechanism 68 can be constructed as a bolt, which can be secured using a matching nut and thus ensures that the replacement bottom wall 42 is stably and releasably held on the connecting mechanism 48 and by means of the connecting mechanism on the circumferential wall 16. Alternatively, this connecting mechanism 68 can be constructed as a rivet or other retaining pin, which can be removed in a relatively simple manner and without the use of a large number of tools, and especially without damaging the two connecting sections 50, 62.

[0034] The replaceable bottom wall 42, which encloses the internal space 24 of the housing in the axial direction, has a second axial support section 70 that mates with the first axial support section 54 of the connecting element. This is provided by a radially outer section 72 of the bottom region of the replaceable bottom wall 42, generally indicated by 74. By providing the radially outer section 72 of the second axial support section 70, the bottom region 74 of the replaceable bottom wall 42 extends substantially radially inward in the radial direction, thereby ensuring a planar abutment contact between the first axial support section 54 of the connecting element 48 and the second axial support section 70 of the replaceable bottom wall 42.

[0035] A radially outer section 72 of the bottom region 74 is connected to an arched section 76 of the bottom region 74 in a direction away from the housing interior space 24, which ensures a defined deflection of the exhaust gas flowing toward it.

[0036] The radially outer section 72 of the bottom region 74, which provides the second axial support section 70, transitions into the second connecting section 62 of the connecting device 46 in the second transition region 77. The second transition region 77 includes a generally cylindrical transition section 78 extending longitudinally along the longitudinal axis L of the housing and annularly surrounding the longitudinal axis L. This transition section, like the second connecting section 62, is positioned radially inward of the first connecting section 50 of the connecting element 48, but with an axial distance from it. This means that the transition section 78 is arranged radially inwardly offset relative to the second connecting section 62 and transitions into the second connecting section in a stepped or conical transition section 80.

[0037] Figure 2 It can be seen that the transition section 78, radially spaced from the first connecting section 50, extends beyond the region in the direction away from the housing interior 24, in which the connecting element 48 is connected to the circumferential wall 16 by a weld 60. Therefore, particularly on the connecting element 48, the slight shape change that may occur due to the weld 60 does not affect the positionability of the replacement bottom wall 42 within the connecting element 48. More precisely, the connecting element can be pre-inserted into the connecting element 48 with a slightly smaller radially sized end region provided by the second transition region 77, until the replacement bottom wall 42 first abuts against the sealing element 58 and, after compressing the sealing element, abuts against the first axial support section 54 of the connecting element 48 by means of its second axial support section 70.

[0038] In this state, the first connecting mechanism through-opening 64 and the second connecting mechanism through-opening 66 are also located in the same axial region, such that before the connecting mechanism 68 is guided through the connecting mechanism through-openings, if necessary, the circumferential alignment of the connecting mechanism through-openings 64 and 66 can also be achieved by rotating the replacement bottom wall 42 about the longitudinal axis L of the housing, and in this way the replacement bottom wall 42 can be loosely mounted on the connecting mechanism 48 and therefore also loosely mounted on the circumferential wall 16. In this state, the internal space 24 of the housing is hermetically sealed by the replacement bottom wall 42 and, in particular, by the sealing element 58. Based on the fact that the second axial support section 70 preferably rests uninterruptedly against the first axial support section 54 in the circumferential direction within the radial interior of the sealing element 58, the sealing element 58 is shielded from exhaust flow and thus protected from excessive thermal and chemical loads. Since the connecting element 48 acts radially inward in a relatively small amount in the region of the first axial support section 54 with its generally L-shaped profile and only slightly (not at all in the case of the corresponding dimensional design) radially overlaps the arched section 76 of the bottom region 74, the function of the arched section 76 of the bottom region 74 is not impaired for the defined flow deflection.

[0039] To minimize outward heat loss, a second bottom element 84, which is provided on a first bottom element 82, essentially a sheet metal part, having a bottom region 74 with two sections 72, 76, a second transition region 77, and a second connecting section 62, is provided to match the shape of the bottom region 74 in an arched configuration. This second bottom element can also be constructed as a sheet metal part. Radially outward, the second bottom element 84 is joined to the first bottom element 82 in the region of the transition section 78, for example, by welding. Together with the first bottom element 82, the second bottom element 84 defines an insulating volume 86 in which an insulating material, such as fibrous or foamed insulation material 88, can be received. In this way, it is ensured that the exhaust gas, which occurs during flow diversion in a strong thermal interaction with the bottom region 74, releases relatively little heat in the region of the replacement bottom wall 42, allowing sufficiently hot exhaust gas to flow in the flow direction through the system area further downstream of the exhaust treatment assembly 10 or exhaust system 12 and thus be maintained at or quickly reach the operating temperature.

[0040] The exhaust treatment assembly, according to the invention, provides the feasibility of removing the bottom wall of the housing of the exhaust treatment unit in a simple manner and with tools of relatively simple construction, and then reinstalling the bottom wall, so that the process of replacing one or more exhaust treatment units disposed in the housing can be carried out simply and can also be carried out in a workshop that is not specialized in this area or equipped with specialized tools.

Claims

1. An exhaust treatment assembly for an exhaust system of an internal combustion engine, the exhaust treatment assembly comprising a housing (14) having a circumferential wall (16) extending longitudinally along a longitudinal axis (L) of the housing and at least one bottom wall (18, 20) connected to the circumferential wall (16) in an outer peripheral region, wherein at least one exhaust treatment unit (22, 26) is positioned in a manner removable from the housing (14) in an internal space (24) of the housing surrounded and defined by the circumferential wall (16) and the at least one bottom wall (18, 20), the at least one bottom wall (18) being a replaceable bottom wall (42) detachably connected to the circumferential wall (16) by means of a connecting device (46), the connecting device (46) comprising on the circumferential wall (16) a first connecting section (50) extending along a longitudinal axis (L) of the housing and a first axial support section (54) extending radially inward relative to the first connecting section (50), and the connecting device comprising on the replaceable bottom wall (42): A second connecting section (62) extending radially adjacent to the first connecting section (50) along the longitudinal axis (L) of the housing and detachably connected to the first connecting section (50) by means of at least one connecting mechanism (68); and a second axial support section (70) extending radially inward relative to the second connecting section (62) and supported on the first axial support section (54) along the longitudinal axis (L) of the housing, wherein, - In the first connecting section (50), a plurality of first connecting mechanism through openings (64) are provided, which are spaced apart from each other in the circumferential direction around the longitudinal axis (L) of the housing or / and along the longitudinal axis (L) of the housing. - In the second connection section (62), a plurality of second connection mechanism through openings (66) are provided, which are spaced apart from each other in the circumferential direction around the longitudinal axis (L) of the housing and / or along the longitudinal axis (L) of the housing, and - In the replacement bottom wall (42) connected to the circumferential wall (16), a plurality of pairs consisting of a first connecting mechanism through opening (64) and a second connecting mechanism through opening (66) are respectively passed through by the connecting mechanism (68).

2. The exhaust gas treatment assembly according to claim 1, characterized in that, The first connecting section (50) and / or the second connecting section (62) are configured to form an annular shape surrounding the longitudinal axis (L) of the housing.

3. The exhaust treatment assembly according to claim 1 or 2, characterized in that, At least one connecting mechanism (68) includes a bolt, or / and at least one connecting mechanism (68) includes a rivet.

4. The exhaust gas treatment assembly according to claim 1 or 2, characterized in that, Each connecting mechanism (68) includes a bolt, or / and each connecting mechanism (68) includes a rivet.

5. The exhaust treatment assembly according to claim 1 or 2, characterized in that, The first axial support section (54) is constructed in a ring shape.

6. The exhaust gas treatment assembly according to claim 1 or 2, characterized in that, The first axial support section (54) is connected to the first connection section (50) in a first transition region (52) that provides a sealing element-receiving forming part (56), wherein a sealing element (58) is arranged in the sealing element-receiving forming part (56) to surround the longitudinal axis (L) of the housing.

7. The exhaust treatment assembly according to claim 1 or 2, characterized in that, The connecting device (46) includes a connecting element (48) fixed to the circumferential wall (16) that provides the first connecting section (50) and the first axial support section (54).

8. The exhaust treatment assembly according to claim 7, characterized in that, The connecting element (48) is constructed as a sheet metal part, or / and the connecting element (48) has an L-shaped longitudinal section structure, or / and the connecting element (48) is inserted into the axial end region of the circumferential wall (16) with a portion of the first connecting section (50) and the first axial support section (54), or / and the connecting element (48) is connected to the circumferential wall (16) by material locking.

9. The exhaust treatment assembly according to claim 8, characterized in that, The connecting element (48) is connected to the circumferential wall (16) by welding or brazing.

10. The exhaust treatment assembly according to claim 1 or 2, characterized in that, The second axial support section (70) is provided by the radially outer section (72) of the bottom region (74) of the replacement bottom wall (42).

11. The exhaust treatment assembly according to claim 10, characterized in that, The radially outer section (72) of the bottom region (74) is arranged radially extending, and / or the section (76) of the bottom region (74) connected to the radially outer section (72) of the bottom region (74) is constructed in an arched shape.

12. The exhaust gas treatment assembly according to claim 11, characterized in that, The section (76) of the bottom region (74) connected to the radially outer section (72) of the bottom region (74) is constructed in an arched shape in a direction away from the interior space (24) of the shell.

13. The exhaust treatment assembly according to claim 1 or 2, characterized in that, The second axial support section (70) is connected to the second connection section (62) in the second transition region (77), the second transition region (77) including a transition section (78) that is radially offset relative to the second connection section (62) and extends along the longitudinal axis (L) of the housing at a radial distance spaced from the first connection section (50).

14. The exhaust gas treatment assembly according to claim 13, characterized in that, The second transition region (77) includes a transition section (78) that is radially offset from the second connecting section (62) and extends along the longitudinal axis (L) of the housing at a radially spaced distance from the first connecting section (50).

15. The exhaust treatment assembly according to claim 1 or 2, characterized in that, The second connecting section (62) and the second axial support section (70) are disposed on the first bottom element (82) of the replacement bottom wall (42).

16. The exhaust treatment assembly according to claim 15, characterized in that, The first bottom element (82) is constructed as a sheet metal part, and / or a second bottom element (84) is arranged on the side of the second axial support section (70) opposite to the housing interior space (24) to define an insulating volume (86) together with the first bottom element (82).

17. The exhaust treatment assembly according to claim 16, characterized in that, The insulating volume (86) is filled with insulating material (88).

18. The exhaust treatment assembly according to claim 13, characterized in that, The second connecting section (62) and the second axial support section (70) are disposed on the first bottom element (82) of the replacement bottom wall (42). A second bottom element (84) is arranged on the side of the second axial support section (70) opposite to the housing interior space (24) to define an insulating volume (86) together with the first bottom element (82). The second bottom element (84) is connected to the first bottom element (82) in the region of the transition section (78).

19. The exhaust treatment assembly according to claim 1 or 2, characterized in that, At least one intermediate wall (28, 30) is provided in the internal space (24) of the housing, wherein at least one intermediate wall (28, 30) is associated with at least one exhaust treatment unit (22, 26) and has an exhaust treatment unit through opening (32, 34, 36, 38) through which the exhaust treatment unit (22, 26) passes, or / and at least one exhaust treatment unit (22, 26) is detachably fixed to at least one intermediate wall (28, 30).

20. The exhaust treatment assembly according to claim 19, characterized in that, In the internal space (24) of the housing, there are a plurality of intermediate walls (28, 30) arranged sequentially along the longitudinal axis (L) of the housing, wherein each intermediate wall (28, 30) has an exhaust treatment unit through opening (32, 34, 36, 38) through which the exhaust treatment unit (22, 26) passes, or / and each exhaust treatment unit (22, 26) can be detachably fixed on the intermediate wall (30) closest to the location of the replacement bottom wall (42).

21. An exhaust system for an internal combustion engine, the exhaust system comprising at least one exhaust treatment component (10) according to any one of claims 1 to 20.

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