EP2336518B1 - Exhaust gas treatment device - Google Patents

Description

The present invention relates to an exhaust gas treatment device for an exhaust system of an internal combustion engine, in particular a road vehicle. An exhaust treatment device may, for. B. as a catalyst or as a particulate filter or as a silencer or comprise any combination of such devices. In any case, such an exhaust gas treatment device usually has a housing which encloses at least one interior space. For certain applications, in particular silencers, it may be necessary to guide at least one passage tube without interruption through the interior, this passage tube is then held at two spaced locations in the housing. For example. passes through the through-tube two spaced bottoms of the housing, which stabilize the passage tube laterally. Such passage tube are for example in the DE1933339 . EP0508145 . JP2008240586 and the JPH0868319 described. To reduce or avoid stresses between the passage tube and the housing due to thermally induced expansion effects, it is customary to attach the passage tube only at one bottom, while it is held axially movable on the other floor via a sliding seat.

Such sliding seat solutions are problematic because a sliding seat can pinch due to impurities. Tolerance-related deviations in the sliding seat can also generate excessive play, which can result in transverse movements and thus in noise. In case of excessive play also missing the radial support for the mechanically loaded pipe. This results in a higher load on the welded joint between the respective pipe and the housing.

The present invention is concerned with the problem, for an exhaust gas treatment device in which a continuous tube assembly is supported in a housing to provide an improved or at least another embodiment, which is particularly characterized in that it avoids at least one of the disadvantages of a sliding seat solution.

This problem is solved according to the invention by the subject matters of the independent claims. Advantageous embodiments are the subject of the dependent claims.

The present invention is based on the general idea to provide a wall of the respective tube with strips which are adjacent to each other in the circumferential direction, which are designed to be resilient radially to the longitudinal central axis of the respective tube and thereby protrude from the rest of the tube to the outside or inwards. The strips thereby form elements which are elastically resilient in the radial direction. This can be used according to a first solution of the present invention to cushion axial forces that can attack the through-ear when it is, for example, on both sides of the strip-equipped area fixedly connected to the housing. On the other hand, in a second solution of the present invention, the elastic strips enable the realization of a sliding seat in which one tube is supported on the other tube by radial prestressing via the radially elastic strips. Tolerance-related deviations can be compensated by the elastic strips, whereby the risk of noise can be significantly reduced. Furthermore, the strips touch the other tube only in a very small contact area, whereby the risk of jamming of the pipes in the sliding seat is significantly reduced.

According to the above-mentioned first solution, the at least one through-tube is fixedly connected to the housing at two fastening points which are remote from one another, and has at least one expansion-compensating section between these fastening points which has said elastic strips. For this purpose, in the expansion compensation section in a wall of the passage tube, slots and strips are formed which alternate in the circumferential direction. As the slots penetrate the wall of the passageway, the strips project toward adjacent wall portions of the passageway.

According to the second solution mentioned above, the housing of the exhaust gas treatment device comprises two pipes mounted longitudinally displaceably via a sliding seat, wherein one of the pipes in the sliding seat has a spring section which has the resilient strips. For this purpose, a wall of the respective tube has a plurality of circumferentially adjacent strips, which abut radially resiliently on the other tube with respect to the longitudinal central axis of the tube prevailing in the spring section.

According to an advantageous embodiment, in the spring section, the strips may be formed by the fact that the wall in the spring section is interrupted in the circumferential direction by a plurality of slots penetrating the wall, while the strips project with respect to adjacent wall sections of the respective tube. In that regard, this spring section can be designed basically identical to the expansion compensation section of the first solution.

Alternatively, it is also possible to form the strips of the spring section in that in the spring section in the wall adjacent in the circumferential direction, a plurality of strip-shaped wall sections are cut free and exhibited. The respective free-cutting contour summarizes the respective strip-shaped wall section on three sides, while it only remains firmly connected to the remaining wall of the pipe on the fourth side. By reshaping the thus far cut wall section is issued. In contrast to the previously described embodiment, the slots each define only one side of adjacent strips. Also, there the strips are connected at two spaced apart sides in the region of the slot ends each fixed to the wall of the passage tube.

Irrespective of whether they are produced with the aid of slits or with the aid of free-cutting contours, the strips can be curved in a wavy or zigzag-shaped manner. In this case, a wave-shaped curvature is preferred because there the risk of excessive voltage peaks is reduced in a compact design. Furthermore, it is preferable to simply bend or bend the strips with respect to a longitudinal central axis of the respective tube to the outside or to the inside. Likewise, it is basically possible to bend or bend the strips several times so that they have at least one outwardly curved or bent region and at least one inwardly curved or bent region with respect to the longitudinal central axis of the respective tube.

In an inexpensive embodiment, the strips can be curved in a simple or two-dimensional manner, so that they are curved only with respect to a longitudinal direction of the respective tube. Alternatively, in a somewhat more elaborate embodiment, the strips may be curved twice or three-dimensionally, so that they are arched both in the longitudinal direction and transversely thereto, ie in the circumferential direction.

Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Preferred embodiments of the invention are illustrated in the drawings and will be described in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components.

Fig. 1

einen stark vereinfachten, prinzipiellen Längsschnitt einer Abgasbehandlungseinrichtung gemäß einer ersten Ausführungsform,

Fig. 2

ein vergrößertes Detail II aus Fig. 1 im Bereich eines Dehnungsausgleichsabschnitts,

Fig. 3

ein vergrößertes Detail III aus Fig. 2 im Bereich eines Streifens des Dehnungsausgleichsabschnitts,

Fig. 4

eine Ansicht wie in Fig. 1, jedoch bei einer zweiten Ausführungsform der Abgasbehandlungseinrichtung,

Fig. 5

ein vergrößertes Detail V aus Fig. 4 im Bereich eines Federabschnitts,

Fig. 6

ein vergrößertes Detail VI aus Fig. 5 im Bereich eines Streifens des Federabschnitts,

Fig. 7

eine Detailansicht wie in Fig. 5, jedoch bei einer weiteren Ausführungsform,

Fig. 8

eine Detailansicht wie in Fig. 7, jedoch bei einer anderen Ausführungsform,

Fig. 9-12

stark vereinfachte Detailansichten eines Streifens bei verschiedenen anderen Ausführungsformen,

Fig. 13-14

je einen vereinfachten Querschnitt durch einen Streifen gemäß Schnittlinien XIII aus Fig. 5, bei verschiedenen Ausführungsformen.

Show, in each case schematically,

Fig. 1

a greatly simplified, fundamental longitudinal section of an exhaust gas treatment device according to a first embodiment,

Fig. 2

an enlarged detail II Fig. 1 in the area of a strain compensation section,

Fig. 3

an enlarged detail III Fig. 2 in the region of a strip of the expansion compensation section,

Fig. 4

a view like in Fig. 1 but in a second embodiment of the exhaust treatment device,

Fig. 5

an enlarged detail V from Fig. 4 in the region of a spring section,

Fig. 6

an enlarged detail VI Fig. 5 in the region of a strip of the spring section,

Fig. 7

a detail view like in Fig. 5 but in another embodiment,

Fig. 8

a detail view like in Fig. 7 but in another embodiment,

Fig. 9-12

highly simplified detail views of a strip in various other embodiments,

Fig. 13-14

each a simplified cross section through a strip according to section lines XIII Fig. 5 in different embodiments.

Corresponding Fig. 1 an exhaust gas treatment device 1 comprises a housing 2, which encloses at least one inner space 3. The exhaust gas treatment device 1 is provided for an - here only partially recognizable - exhaust system 4 of an internal combustion engine, which may be arranged in particular in a road vehicle. In the exhaust gas treatment device 1 may be a catalyst such. For example, an oxidation catalyst or an NOX storage catalyst or an SCR catalyst. Likewise, the exhaust gas treatment device 1 may be a particle filter, in particular a soot filter. Furthermore, the exhaust gas treatment device 1 may be a silencer. Likewise, it may be a basically arbitrary combination of catalyst, particulate filter and / or muffler. In particular, the show Fig. 1 and 4 in each case only a part of the exhaust gas treatment device 1.

At the in Fig. 1 In the embodiment shown, the exhaust gas treatment device 1 has at least one through-tube 5, which is passed through the interior 3 without interruption, thus interspersing the interior 3 without interruption. Further, the passage tube 5 is fixedly connected to the housing 2 at two attachment points 6 and 7 remote from each other. For example. the fastening points 6, 7 can be realized by welded joints.

Between the attachment points 6, 7, the passage tube 5 has at least one expansion compensation section 8, which in Fig. 1 indicated by a curly bracket. Concerning. a longitudinal center axis 9 of the passage tube fifth the expansion compensation section 8 is a longitudinal section or axial section. In the example of Fig. 1 two such expansion compensation sections 8 are indicated, which can be realized alternatively or cumulatively.

According to Fig. 2 The respective expansion compensation section 8 is characterized in that a wall 10 of the through-tube 5 has a plurality of strips 11 and a plurality of slots 12 therein, which alternate in the circumferential direction relative to the longitudinal axis 9. The slits 12 penetrate the wall 10. The strips 11 project relative to adjacent wall sections 13 and 14 of the through-tube 5. Suitably, the strips 11 are geometrically shaped so that they absorb elastic forces acting in the passage tube 5 tensile and compressive forces. Such forces can be introduced via the attachment points 6, 7 in the passage tube 5. For example. Thermally induced elongation effects can cause the passage tube 5 expands faster and / or stronger than the housing 2, which can lead to the said forces.

In the FIGS. 2 and 3 the strips 11 are undulating and simply curved outwards. Fig. 3 illustrates the operation of the strips 11. A indicated by an arrow 15 pressing force 15 leads to a compression 16 of the passage tube 5. The strips 11 can elastically bulge and thereby perform a stroke 17 which compensates the compression 16 and the compression force 15 resiliently receives. If the pressure force 15 goes back, the compression 16 also decreases, as a result of which the stroke 17 also decreases elastically. The same applies vice versa for tensile forces.

According to Fig. 1 are the attachment points 6, 7 on the housing side 2 provided at end bottoms 34, 35 of the housing 2. It is clear that at another Configuration, the floors 34, 35 also inside, so in the interior of the housing 2 arranged floors can be.

Fig. 4 shows another embodiment of the exhaust treatment device 1. It differs from the in Fig. 1 shown embodiment in that no two attachment points 6, 7 fixed to the housing 2 through pipe 5 is present, but that in the housing 2, two tubes 18, 19 are mounted longitudinally displaceable via a sliding seat 20 together. The one tube 18, which is also referred to below as the first tube 18, can be fixedly connected to the housing 2 via an attachment point 21. The fastening point 21 can be realized, for example, by means of a welded connection. The other tube 19, which is also referred to below as the second tube 19, may also be fixedly attached to the housing 2. The two tubes 18, 19 are inserted into the sliding seat 20 coaxially with each other.

This in Fig. 4 shorter second tube 19 may also be formed by a pipe socket which is formed on a wall 33 of the housing 2. This pipe socket 19 may be integrally formed on this wall 33.

One of the tubes 18, 19 has in the sliding seat 20 on a spring portion 22 which in Fig. 4 indicated by a curly bracket. According to Fig. 5 This spring section 22 is characterized in that it has a plurality of strips, which are also referred to below as 11. These strips 11 are arranged adjacent to the longitudinal axis 9 in the circumferential direction. Furthermore, they are designed resiliently with respect to the longitudinal central axis 9 in the radial direction. Furthermore, they rest on the respective other tube 18, 19 in particular under radial prestress.

In the embodiments of the Fig. 5 . 7 and 8 is in each case the first tube 18 equipped with this spring portion 22. In the in the Fig. 5 and 8th In embodiments shown, the first tube 18 is inserted into the second tube 19 and thus forms an inner tube 18 in the sliding seat 20. The strips 11 are then shaped in these embodiments so that they protrude outwardly from the first tube 18 and on the outer second Tube 19 come radially biased to the plant. In contrast, shows Fig. 7 another embodiment in which the first tube 18 is fitted externally on the second tube 19 and accordingly forms the outer tube 18 in the sliding seat 20. In this case, the strips 11 are shaped so that they protrude inwards towards the inner second tube 19 and come to rest radially biased. With regard to the shaping of the strips 11 refers Fig. 7 to the embodiment of the Fig. 5 , It is clear that this configuration with inwardly biased strips 11 also in the in Fig. 8 shown embodiment of the strip 11 is realized.

The operation of the spring portion 22 is in Fig. 6 explained. Fig. 6 refers to the in Fig. 5 embodiment shown, but is analogous to the in the FIGS. 7 and 8 shown embodiments applicable.

The strips 11 are geometrically shaped so that they define before the piercing of the tubes 18, 19 in the sliding seat 20 in the spring portion 22 an outer perimeter whose cross-section is greater than the free cross section of the second tube 19, in which with the spring portion 22nd equipped first tube 18 is to be inserted. If the first tube 18 as in Fig. 7 is to be plugged onto the second tube 19, the strips 11 are then analogously shaped so that prior to mating of the tubes 18, 19 in the sliding seat 20 they define an inner perimeter whose cross section is smaller than the outer cross section of the second tube nineteenth

In any case, the plug-in process according to Fig. 6 to an indicated by an arrow radial force 23, which deforms the strip 11 resiliently, namely compresses or flattens. This results in a stroke change 24, around which the resilient strips 11 yield elastically in the radial direction. From this stroke change 24 results in an indicated by an arrow change in length 25 of the first tube 18. Since the strip 11 deform elastically, the change in length of the first tube 18 is elastic. Since the strips yield 11 resiliently, the deformation leads to a restoring spring force, which generates a radial bias, with which the strips 11 abut the other tube 19.

Like that FIGS. 13 and 14 can be removed, may optionally be provided to bend the respective strip 11 not only simple, but twice or buckle. The simply curved or only two-dimensionally curved strips 11 are curved or arched only with respect to the longitudinal direction. The double-curved or three-dimensionally curved strips 11 are additionally curved or arched relative to the circumferential direction. This is so realizable with all sliding seats 20. The curvature or curvature with respect to the circumferential direction is in the FIGS. 13 and 14 denoted by 37. When profile of Fig. 13 the vault 37 has two turning points. When profile of Fig. 14 the bulge 37 is non-pointing.

According to the Fig. 5 . 7 and 8 In addition, the shape of the strips 11 causes the strips 11 to contact the respective other tube 19 only over comparatively small contact surfaces 26. This significantly reduces friction on the one hand. On the other hand, the risk of jamming of the two tubes 18, 19 in the sliding seat 20 is considerably reduced.

The respective contact surface 26 is smaller than a surface 36 of the respective strip 11, which faces the other tube 19. For example, the contact surface 26 of the respective strip 11 occupies a maximum of 30% or a maximum of 25% or a maximum of 20% or a maximum of 15% or a maximum of 10% or a maximum of 5% of the surface 36 of the respective strip 11. With a simple curvature or curvature of the respective strip 11, a reduction of the respective contact surface 26 to a line extending in the circumferential direction is preferred. If the curvature or curvature of the respective strip 11 is realized twice or three-dimensionally, the respective contact surface 26 preferably reduces to one point.

In the in the Fig. 5 to 7 In the embodiment shown, the strips 11 are realized in that a wall, which is also referred to below as 10, of the respective tube, here the first tube 18 in the spring section 22 is interrupted by a plurality of slots, will also be referred to below as 12. The slots 12 penetrate the wall 10. The slots 12 and the strips 11 alternate in the circumferential direction. In the example of Fig. 5 the spring portion 22 is formed on the inside of the sliding seat 20 tube 18 so that the strips 11 project outwardly. In contrast, the spring portion 22 at the in Fig. 7 shown embodiment formed on the outside in the sliding seat 20 tube 18 so that there the strips 11 protrude inwards.

The spring portion 22 of in Fig. 5 to 7 shown embodiments, basically identical to the expansion compensation section 8 in the Fig. 1 to 3 be shown embodiment.

Fig. 8 now shows another embodiment for the realization of the spring portion 22. In this case, the strips 11 are realized by that in the spring section 22 in a wall, which is also referred to below as 10, the respective tube, here the first tube 18, a plurality of strip-shaped wall sections 27 are cut free by means of cuts 28 and issued. The cuts 28 may be designed in particular U-shaped. In any case, they enclose the strip-shaped wall portions 27 from three sides, whereby the wall portions 27 can be exposed to form the strips 11. Between adjacent flared strips 11 are in the spring portion 22 in this embodiment, further strip-shaped wall portions 29 are present, which connect to the spring portion 22 adjacent wall portions of the tube 18, which are also designated here with 13 and 14 with each other. Such strip-shaped wall portions 29, which connect the adjacent wall sections 13, 14 with each other and which are present in addition to the issued strip 11, missing in the in the Fig. 5 to 7 shown embodiments. There assume this connection function, the strips 11, which are connected to two adjacent wall sections 13, 14.

In the example shown the Fig. 8 , the spring portion 22 is formed on the inside of the sliding seat 20 tube 18 so that the strips 11 are issued to the outside. Alternatively, it is also possible to form the spring section 22 on the outside in the sliding seat 20 tube, so that then the strips 11 are issued inward. Concerning. one in Fig. 8 indicated by an arrow exhaust gas flow direction 30, the strips 11 are here cut free so that their upstream end is firmly connected to the wall 10. It is clear that in another embodiment, a reverse construction is feasible, so that then a downstream end of the strip 11 with the wall 10 is firmly connected.

The respective passage tube 5 or the respective tube 18, 19 has in the embodiments shown outside of the expansion compensation section 8 or outside the spring portion 22 purely by way of example in each case a constant cross section. It is clear that in other embodiments here also varying cross sections can be realized. In particular, the respective tube 5, 18, 19 may also be a funnel.

In the in the Fig. 1 to 8 In the embodiments shown, the strips 11 are undulating and simply curved irrespective of their form of realization. The Fig. 9 to 12 indicate other geometries for the strips 11, but without claim to completeness. The in the Fig. 9 to 12 shown different shapes for the strips 11 are also feasible within the expansion compensation section 8 as in the spring section 22. Also, they are not only for the both sides connected to the wall 10 strips 11 of the embodiments according to the Fig. 2 . 5 and 7 feasible, but also for the only one side connected to the wall 10 strip 11 of the embodiment according to Fig. 8 ,

In detail shows Fig. 9 a doubly wavy curved strip 11 having an outwardly curved or outwardly projecting portion 31 and an inwardly curved or inwardly projecting portion 32; The 10 and 11 each show a strip 11 which is bent or bent in a zigzag shape. In Fig. 10 the strip 11 is bent outward or angled while in Fig. 11 angled or bent inwards. While the strip in the 10 and 11 in each case only simply bent zigzag-shaped, shows Fig. 12 a variant in which the strip 11 is bent or angled twice in a zig-zag shape. In this embodiment, the strip 11 thus again has an outwardly bent or outwardly projecting region 31 and an inwardly bent or inwardly projecting region 32. According to the invention, the strips 11 each extend parallel to the longitudinal central axis 9. Accordingly, the slots 12 also extend parallel to the longitudinal central axis 9.

In all the embodiments shown, the strips 11 are integrally formed on the respective tube 5, 18. Basically, however, an embodiment is conceivable in which the strips 11 are separate components which are attached to the respective pipe 5, 18.

Claims (12)

1. An exhaust gas treatment device for an exhaust system (4) of a combustion engine, more preferably of a road vehicle,

   - with a housing (2), enveloping at least one interior space (3),

   - with at least one through-pipe (5) penetrating the interior space (3) without interruption and which is connected to the housing (2) in a fixed manner at two fastening points (6, 7) distant from each other,

   - wherein the through-pipe (5) between the fastening points (6, 7) comprises at least one expansion compensation section (8), in which a wall (10) of the through-pipe (5) comprises alternating in circumferential direction strips (11) and slits (12) penetrating the wall (10),

   - wherein the strips (11) protrude relative to adjacent wall sections (13, 14) of the through-pipe (5) radially outwards or inwards with respect to the longitudinal centre axis (9), and are with respect to the longitudinal centre axis (9) radially spring-elastic such that the strips (11) spring-elastically absorb tensile and compressive forces (15) introduced into the through-pipe (5) via the fastening points (6, 7),

   characterized in
   that the strips (11) and slits (12) extend parallel to the longitudinal centre axis (9) of the through-pipe (5).
2. The exhaust gas treatment device according to Claim 1,
   characterized in
   that the strips (11) are curved wave-like or bent zigzag-shaped.
3. The exhaust gas treatment device according to Claim 2,
   characterized in

   - that the strips (11) with respect to a longitudinal centre axis (9) of the through-pipe (5) in the expansion compensation section (8) are curved or bent one-way to the outside or to the inside, and/or

   - that the strips (11) are multiply curved or bent and with respect to a longitudinal centre axis (9) of the through-pipe (5) in the expansion compensation section (8) comprise at least one region (31) curved or bent to the outside and at least one region (32) curved or bent to the inside.
4. An exhaust gas treatment device for an exhaust system (4) of a combustion engine, more preferably of a road vehicle,
   with a housing (2) in which a first pipe (18) is mounted on a second pipe (19) longitudinally displaceable via a sliding seat (20),
   characterized in

   - that the first pipe (18) and the second pipe (19) are each connected to the housing (29) in a fixed manner,

   - that one of the pipes (18, 19) in the sliding seat (20) comprises a spring section (22), in which a wall (10) of the respective pipe (18, 19) has a plurality of strips (11) adjacent in circumferential direction, which with respect to a longitudinal centre axis (9) of the respective pipe (18, 19) in the spring section (22) radially bear against the other pipe (18, 19) in a spring-elastic manner,

   - that the strips (11) are formed in that the wall (10) in the spring section (22) in circumferential direction is interrupted by a plurality of slits (22) penetrating the wall (10) and the strips (11) protrude with respect to adjacent wall sections (13, 14) of the respective pipe (18, 19),

   - that the strips (11) and slits (12) extend parallel to the longitudinal centre axis (9) of the respective pipe (18, 19).
5. The exhaust gas treatment device according to Claim 4,
   characterized in

   - that the strips (11) are shaped so that they come to bear against the respective other pipe (18, 19) under preload,

   - wherein it can be more preferably provided that the respective strip (11) comes to bear against the respective other pipe (18, 19) via a contact area (26) which is smaller than the area (36) of the strip (11) facing the respective other pipe (18, 19), wherein the contact area (26) amounts to a maximum of 30% or a maximum of 25% or a maximum of 20% or a maximum of 10% of the area (36) of the strip (11).
6. The exhaust gas treatment device according to Claim 4 or 5,
   characterized in
   that the spring section (22) is formed on the pipe (18) located inside in the sliding seat (20) and the strips (11) protrude to the outside or in that the spring section (22) is formed on the pipe (18) located outside in the sliding seat (22) and the strips (11) protrude to the inside.
7. The exhaust gas treatment device according to Claim 6,
   characterized in

   - that the strips (11) are curved wave-like or bent zigzag-shaped,

   - wherein it can be more preferably provided that the strips (11) with respect to a longitudinal centre axis (9) of the through-pipe (5) in the expansion compensation section (8) are curved or bent one-way to the outside or curved or bent one-way to the inside,

   - wherein it can be more preferably provided that the strips (11) are multiply curved or bent and with respect to a longitudinal centre axis (9) of the through-pipe (5) in the expansion compensation section (8) comprise at least one region (31) curved or bent to the outside and at least one region (32) curved or bent to the inside.
8. The exhaust gas treatment device according to Claim 4 or 5,
   characterized in

   - that the strips (11) are formed in that in the spring section (22) in the wall (10) adjacent in circumferential direction a plurality of strip-shaped wall sections (27) are cut free and flared out,

   - wherein it can be more preferably provided that the wall (10) in the spring section (22) in circumferential direction between adjacent flared-out strips (11) comprises a further strip-shaped wall section (29) each, which connects adjacent wall sections (13, 14) of the respective pipe (18, 19) with each other,

   - wherein it can be more preferably provided that the spring section (22) is formed on a pipe (18) located inside in the sliding seat (20) and the strips (11) are flared to the outside or that the spring section (22) is formed on the pipe (18) located outside in the sliding seat (20) and the strips (11) are flared to the inside.
9. The exhaust gas treatment device according to Claim 8,
   characterized in

   - that the flared-out strips (11) are wave-shaped or curved,

   - that the strips (11) are flared out on the leading side or the trailing side.
10. The exhaust gas treatment device according to any one of Claims 4 to 9,
    characterized in

    - that the respective strip (11) is only curved with respect to the longitudinal direction of the respective pipe (18, 19), wherein it can be more preferably provided that the respective strip (11) in the sliding seat (20) contacts the respective other pipe (18, 19) linearly, or

    - that the respective strip (11) is curved with respect to the longitudinal direction of the respective pipe (18, 19) and with respect to the circumferential direction, wherein it can be more preferably provided that the respective strip (11) in the sliding seat (20) contacts the respective other pipe (18, 19) in the manner of a dot.
11. The exhaust gas treatment device according to any one of Claims 1 to 10,
    characterized in

    - that the exhaust gas treatment device (1) is a silencer, and/or

    - that the respective pipe (18, 19) distally to the sliding seat (20) at a fastening point (21) is connected to the housing (2) in a fixed manner, and/or

    - that the respective fastening point (6, 7, 21) is formed through a welded connection, and/or

    - that a pipe (19) is formed by a pipe socket which is formed on a wall (33) of the housing (2), more preferably integrally moulded on the wall (33).
12. The exhaust gas treatment device according to any one of Claims 1 to 11,
    characterized in
    that the strips (11) extend parallel to a longitudinal centre axis (9) of the respective pipe (5, 18, 19).

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