DE102010041666A1 - Exhaust gas guiding device for passenger car, has spring element provided such that radial movement of gas channel is allowed against spring force in region of aperture according to inner edge - Google Patents

Abstract

The device has an inner edge (46, 146) provided with an aperture (44, 144) that extends from an inlet port and an outlet port. A spring element (48) is radially arranged between an outer surface (16b) and an inner edge of an exhausting gas channel (16). The outer surface of the exhausting gas channel is extended from an exhaust gas intake channel and an exhaust gas discharge passage. The spring element is provided such that radial movement of the gas channel is allowed against spring force in a region of the aperture according to the inner edge.

Description

The present invention relates to a motor vehicle exhaust gas routing device having a functional housing, such as a silencer housing, further with an exhaust inlet channel opening out into an inlet opening of the functional housing along a direction of the opening and with an exhaust gas outlet channel leading away from the functional housing along an outlet opening of the functional housing ,

Such exhaust gas routing devices are generally installed in automobiles.

In an effort to save weight on the motor vehicle, it is increasingly being considered about the replacement of metallic components by components, which at least partly consist of plastic.

In automotive exhaust systems, the additional problem of high exhaust gas temperatures occurs, which due to the thermal resistance of plastics use of the same, compared with metals, lower specific gravity complicate.

In addition, due to the large temperature differences between the operating state and a non-operating state of an exhaust gas routing device mounted on a motor vehicle, considerable temperature-related linear expansions occur.

Since corresponding prototypes have already been used, the present invention more precisely relates in its first two aspects to such vehicle exhaust systems of the type mentioned above in which an inner edge of at least one opening of the inlet opening and outlet opening with respect to a respective longitudinal axis of the associated at least one opening Exhaust gas channel from the exhaust gas inlet passage and the exhaust gas outlet passage, radially spaced from an outer surface of the exhaust gas passage is provided.

Object of the present invention is to develop a generic exhaust system such that the usual due to the operating temperatures occurring length expansions of the exhaust passage can take place without mechanically or thermally overburdening the preferably formed using plastic housing function.

This object is achieved according to a first aspect of the present invention by a generic automotive exhaust gas discharge device, in which radially between the outer surface of at least one exhaust gas channel from the exhaust gas inlet channel and exhaust outlet channel and the inner edge of the respective exhaust gas channel associated opening from the inlet opening and outlet opening a spring element is provided, which allows against its spring force in the region of the opening, a radial movement of the exhaust gas channel relative to the inner edge and away from it.

Here, "spring element" in the present application, an element which allows by macroscopic deformation against its material-related and shape-related Elastiztät a movement of the exhaust passage relative to the associated inner edge of the functional housing. "Macroscopic" means that the operational deformation are in the order of the dimensions of the spring element itself, so usually amount to a millimeter or more. By contrast, the term "spring element" is not intended to include such components which, due to the ever-present elasticity of the material, have a theoretical elastic deformability which, however, is of a microscopic nature due to the deformations occurring due to the operational conditions and the components are therefore considered to be rigid in terms of their engineering. Although the present invention is preferably intended for functional housings made at least partially of plastic, the above-mentioned type of connection of an exhaust passage to an inner edge of a function housing can be used quite independently of the materials selected for the exhaust passage and the function housing.

The spring element thus serves because of its elastic properties of the mechanical decoupling of the exhaust gas channel from the functional housing and is due to the existing with the spring element between the exhaust duct and functional housing heat-emitting surface and the thermal decoupling of the exhaust duct and functional housing.

In this case, the exhaust gas channel in the interior of the functional housing in a conventional manner. In a particularly simple embodiment, the exhaust gas channel can run through the functional housing with a continuous channel piece or it can be deflected into its chamber partitions in the functional housing through various chambers with channel pieces connecting open chambers, and the like.

Since it is generally desired that the inlet and / or the exit point of the exhaust gas channel is formed gas-tight into and out of the functional housing, the spring element is preferably designed as a spring washer which surrounds the exhaust gas channel and a radial gap between exhaust duct and inner edge of the Function housing opening closes. In this case, the spring washer is preferably connected to a radially inner edge with the exhaust gas channel and connected to a radially outer edge with the inner edge of the associated opening.

The spring element may be positively connected with its radially inner edge with the exhaust gas channel, such as by snapping into a provided on the outer surface of the exhaust passage groove. Additionally or alternatively, the inner edge of the spring washer may be materially connected to the exhaust gas channel, such as by welding. A particularly good mechanical decoupling of the functional housing from the exhaust gas duct can be obtained by a force, in particular frictional, connection of the radially inner edge of the spring washer with the exhaust gas duct, since then a relative movement between the exhaust duct and radially inner edge of the spring washer in principle is not excluded.

In order to be able to absorb in principle the length expansions occurring in the direction of opening or / and in the outlet direction due to operational temperature changes, the spring element can have a wave-shaped course in a longitudinal section along a sectional plane containing the longitudinal axis of the respective exhaust gas channel in the area of the opening, at least in sections in the radial direction ,

It is advantageous if the wave-shaped course has a different deflection of an imaginary center line of the wave-shaped course to provide areas on the spring element, which deform differently with the same load, so that so-called reserve areas are provided, which only at relatively strong mechanical Begin to deform strain. This can be safely covered with a spring element, the entire load spectrum occurring during operation.

In the embodiment described above with wavy contour in the named longitudinal section, moreover, the surface of the spring element is increased, which facilitates heat dissipation to the environment and thus the thermal decoupling of the functional housing from the exhaust gas duct.

Further, it has proved to be advantageous for reducing the load of the radially outer edge of the spring element receiving inner edge of the opening of the functional housing when the deflection of the wave-shaped course of the spring element increases in the known longitudinal section to the exhaust gas channel. The areas of greater deflection of the undulating shape from its center line are easier to deform due to this shape, so that when a load occurs, the first deformation of the spring element takes place near the exhaust passage and only gradually spreads to the radially outer edge of the spring washer out.

Additionally or alternatively, the spring element at least partially, preferably completely, be formed as a bellows or bellows-like shape, d. H. with a wavy contour profile occurring in the above-mentioned longitudinal section, but at the same time with axial expansion in or against the direction of the outlet or the outlet direction.

Preferably, although not necessarily, the functional housing is formed at least at its inner edge of the respective opening forming region, but preferably completely, made of plastic, while the exhaust gas channel is formed due to the required high temperature resistance of metal. The spring element is preferably formed of metal at least in a region closer to the exhaust gas channel, but possibly also completely, in order to have the necessary temperature resistance.

The object mentioned at the outset is also achieved, according to a second aspect of the present invention, by a generic exhaust gas routing device in which radially between the outer surface of the at least one exhaust gas channel from the exhaust gas inlet channel and the exhaust gas outlet channel and the inner edge of the opening associated with the respective exhaust gas channel a retaining element is provided from the inlet opening and the outlet opening, with which the exhaust gas duct is fixed to the functional housing, wherein the retaining element comprises a metal in a radially inner, the exhaust gas passage nearer section and in a radially outer, the exhaust passage more distant section Plastic includes.

By this holding element of a composite material can be used in the exhaust gas channel closer and thus hotter area of the holding element temperature-resistant metal, which also gives off heat to the environment. In a region of the holding element which is located further away from the exhaust gas channel, if the operating temperatures on the holding element permit, plastic may be provided, for example by molding or encapsulation of the radially outer region of the metallic part of the holding element, wherein the plastic additionally or alternatively, by positive engagement with the metal of the support member may be connected, such as by penetration of corresponding recesses in the metal part.

In a region located radially closer to the exhaust gas duct, the retaining element is preferably formed substantially entirely of metal and is formed substantially completely of plastic in a radially closer manner to the inner edge of the opening of the functional housing.

Preferably, in the radially outermost region of the retaining element, if at least the inner edge of the opening of the functional housing is formed by a plastic, a plastic compatible with the plastic of the functional housing is provided in order to facilitate the connection of retaining element and functional housing.

Advantageously, the retaining element is thus provided such that it is connected to a radial inner portion belonging to the radially inner edge of the exhaust gas channel and having a radially outer portion associated radially outer edge with the functional housing, preferably with the inner edge of the associated opening, connected is. Thus, the radial distance between the inner edge of the functional housing and the outer surface of the associated exhaust gas channel can be bridged with a holding element with the smallest possible dimensions in the radial direction.

Like the previously mentioned spring element, the retaining element can be connected with its radially inner edge in a form-fitting or / and force-locking manner, in particular frictionally engaged, or / and cohesively with the exhaust gas channel while achieving the same advantages.

Furthermore, it can be thought of providing at least two different plastics in succession on the holding element in the radial direction, for example in order to be able to provide mechanically or / and thermally suitable plastics in the respective sections of the holding element. It is especially intended to the provision of plastics with different temperature resistance, the temperature resistance of the plastics from radially inside to radially outside usually decreases. With "temperature resistance" is both a dimensional stability, ie the prevention of a thermally induced softening of the material, as well as the material resistance itself, ie the prevention of a thermally induced material change, in particular material decomposition, referred to.

Preferably, the at least one plastic forms an annular component, which preferably rotates closed to provide a gas-tightness.

In order to be able to share the advantages of the two mentioned aspects, it is advantageous if the holding element described comprises the spring element described at the beginning, for example as a metallic component arranged radially further inwards. In order to achieve a generally desired tightness of the exhaust gas channel inlet into the functional housing or the exhaust gas channel outlet from the functional housing, the retaining element preferably surrounds the exhaust gas channel completely and closes the radial gap between the exhaust gas channel and the inner edge of the opening.

The above-mentioned object of a weight saving on the motor vehicle is also achieved by a motor vehicle exhaust system with a functional housing, such as silencer housing, further with an opening along an opening direction of an inlet opening of the functional housing exhaust inlet port and with an outlet opening along an outlet from the Function housing dissipating exhaust outlet passage, wherein the functional housing comprises at least one in the assembled state lower shell and an upper shell connected thereto, wherein the lower shell is at least part of a motor vehicle underbody panel.

Thus, an already existing component can be used on the motor vehicle as the lower shell of the functional housing. The particular advantage of this measure lies in the fact that on a underbody paneling of a motor vehicle usually already soundproofing measures are provided against a noise emission from the vehicle to the outside. These soundproofing measures on the vehicle underbody paneling can be used with a suitable design in terms of frequency or frequency spectrum and to reduce the noise emission of the exhaust gas channel. A sound wave absorbing underbody construction of a vehicle is known from DE 296 17 845 U1 known, but without any reference to the sound absorption of exhaust ducts in designed for functional housings.

Since at least the vehicle underbody paneling is usually made of a plastic or a composite material with plastic participation, particularly preferably a determination of the exhaust gas channel at the lower shell of the functional housing forming portion of the vehicle underbody paneling by a spring element and / or a Retaining element of the above type done. The same applies alternatively or additionally for the determination of the exhaust gas channel on the upper shell of the functional housing.

Basically, it may be thought that the lower shell of the functional housing in the assembled state, a vehicle underbody paneling supplements, such as by placing them in a recess of the vehicle Underbody paneling is used, so that the vehicle underbody paneling only together with the lower shell forms a continuous outer surface, in particular an effective for the flow of air on the underbody of the moving vehicle aerodynamic contour.

However, it may also be thought that the lower shell is integrally formed with the automotive underbody paneling. This saves separate production tools and assembly steps.

In this case, the vehicle underbody paneling is generally greater than the upper shell in its main extension directions, that is to say projecting beyond the upper shell in at least two directions, preferably in four directions, the four directions generally being in the main plane of extension of the motor vehicle. Underbody cover lie and are directed in pairs opposite.

Due to these proportions of the designer with the upper shell is free in the choice of placement on the car underbody paneling, so that the constructive freedom of the vehicle designer is improved.

As a preparatory measure for the reduction of a noise emission away from the exhaust gas channel, to the outside environment and / or to the vehicle interior, it can be provided that the vehicle underbody paneling on the pointing to the upper shell side and / or the upper shell on the Automotive underside facing side facing in each case towards a lying between the upper shell and the vehicle underbody panel separating surface indicative depressions.

Particularly simple, at least a portion of the wells may be formed by projecting from the upper shell or the vehicle underbody panel ribs. By means of such ribs, said components can also be stiffened, so that with the achieved stiffening with suitable dimensioning of the rib walls and fin distances from each other and the rib height on the stiffening addition, a reduction in acoustic emissions can be achieved. To achieve the greatest possible stiffening effect, the ribs can be arranged honeycomb-shaped, preferably for the formation of honeycombs with hexagonal boundary.

Advantageously, the cost of forming the side walls of the lower shell can be reduced, if these are also formed by ribs of the vehicle underbody paneling. For this purpose, ribs or rib portions of the vehicle underbody panel may be thicker and / or higher in order to provide the necessary strength and / or the possibility of facilitating attachment of the upper shell thereto.

As a measure concluding the abovementioned preparatory measure for increasing the sound insulation, ie for increasing the reduction of exhaust emissions emanating from the exhaust gas duct, it can be provided that at least a part of the recesses, preferably all recesses, are covered by a microperforated film, preferably metal foil. are covered. Chambers or depressions covered with microperforated film for providing a sound-emitting effect are known from the aforementioned DE 296 17 845 U1 basically known.

Moreover, with the microperforated film as the cover of the recesses, an advantageous thermal absorption is effected, which is helpful especially in the vicinity of the exhaust gas duct.

Hereinafter, the present invention will be explained in more detail with reference to embodiments shown in the drawings. It shows:

1 a rough schematic representation of a vehicle rear with integrated in a motor vehicle underbody panel function housing a vehicle exhaust system,

2 a rough schematic plan view of the automotive underbody paneling with exhaust duct and functional housing of 1 .

3 an enlarged longitudinal sectional view of the region of the integrally formed with the automotive underbody cowl functional housing of the exhaust gas routing device of 1 and 2 .

4 possible embodiments of a spring element according to the invention for holding the exhaust gas channel on the functional housing and

5 possible embodiments of a holding element according to the invention for holding the exhaust gas channel on the functional housing.

In 1 is roughly the back of a vehicle 10 shown in partial section. Behind the rear wheel 12 you can see an underbody paneling 14 over which an exhaust pipe 16 runs. At its free longitudinal end 16a the exhaust pipe is open to the environment as usual.

The underbody paneling 14 indicates at its in the assembled state to the motor vehicle 10 indicative side of a ribbed structure 18 on that too in 2 can be seen.

From the underbody paneling 14 forms a section 20 a lower shell 22 a functional housing 24 , which by placing an upper shell 26 on the lower shell 22 is formed.

In the present case, the functional housing forms 24 For example, a silencer, which in the exhaust pipe 16 to reduce propagating noise emissions.

As in the view of 1 It is also possible to recognize the upper shell 26 one of the ribbing 18 the underbody paneling 14 similar ribbing 28 exhibit.

Through the ribbing 18 , which consist of extending in the vehicle longitudinal direction ribs 18a and in the vehicle transverse direction extending ribs 18b Can be formed on the vehicle in the assembled state 10 indicative inside of the underbody paneling 14 , relative to the free top edge of the ribbing 18 , Wells 30 be formed, which in combination with a microperforated cover (see, for example, below the microperforated film 32 ) or a membrane cover the absorption of the exhaust pipe 16 can serve outgoing sound.

Such depressions 30 In addition, they can be arranged by the car 10 Sounds emitted in the rear area prevent them from spreading to the outside of the vehicle.

Typically, the sound absorption characteristics of such covered pits are adjusted by the pit dimensions, such as the absorption frequency spectrum. It is therefore possible in principle, at least areas of ribbing 18 at least in the section 20 the underbody paneling 14 as well as the ribbing 28 the upper shell 26 be designed so that they absorb particularly well sound in a frequency range, as he from the exhaust pipe 16 is emitted.

In 2 is a microperforated film 32 to recognize which in known manner the wells 30 at her from the underbody paneling 14 can cover the far longitudinal end (see also 3 ). The microperforated film 32 is preferably a metal foil.

The underbody paneling 14 ranges in the illustrated example in the vehicle longitudinal direction FL and in the vehicle transverse direction FQ, ie in their main extension directions, to both sides on the upper shell 26 out.

Selected longitudinal ribs 34 from the longitudinal ribs 18a can be designed with greater wall thickness, on its upper edge an attachment of the upper shell 26 at least partially.

But it can also, as the example of the transverse ribs 36 (please refer 3 ) can be seen, for at least partial attachment of the upper shell 26 on the lower shell 22 from the ribbing 18 be formed separate fastening ribs.

Ribs 34 and 36 can facilitate the attachment of the upper shell 26 further from the underbody paneling 14 stand out than the rest of the ribbing 18 in the respective area of the underbody paneling 14 ,

Deviating from the representations of 1 to 3 can also be a ribbing only in the area of the lower shell 22 be formed while reducing noise emissions in the area outside the lower shell 22 from the underbody paneling 14 achieved by other technical measures, for example by providing a layer of LWRT material, wherein LWRT stands for "Low Weight Reinforced Thermoplastics".

Next is the lower shell in the example shown 22 integral with the underbody paneling 14 shown educated. But that does not have to be that way. Alternatively, the underbody paneling 14 have a recess into which the lower shell 22 is used as a separate component.

Preferably, the lower shell is designed as a separate component and used in the recess of the underbody paneling, that underbody paneling and lower shell form a common aerodynamic contour of the completed by the lower shell underbody paneling. The lower shell thus contributes to the formation of the aerodynamic contour of the entire, completed underbody paneling.

The upper shell 26 and the lower shell 22 are how to get in 3 recognizes, advantageously along a parting plane T connected to each other, such as by ultrasonic welding, gluing and / or riveting and the like.

Preferably, for ease of connection, the upper shell and the lower shell are made of compatible plastics, such as by deep drawing or by injection molding.

As in 3 also shown by the ribbing 28 the upper shell formed depressions 38 at theirs from the ground 40 the upper shell remote longitudinal end by a microperforated film 42 , in particular metal foil, be covered.

The microperforated films 32 and 42 serve in a conventional manner together with the wells 30 and 38 for suppressing noise emission from the exhaust pipe 16 to the outside environment.

In 4 are two possible embodiments of a determination of the exhaust pipe 16 at a passage through a wall of the functional housing 24 shown.

In the upper half of 4 is a part of the wall of the functional housing 24 to recognize, at which a passage opening 44 is provided, which radially outward by an inner edge 46 the opening 44 on the functional housing 24 is bounded.

In this opening 44 can be a spring element 48 be arranged, which in 4 having the shape shown above.

The radially inner edge 48a the spring element may be formed as a skirt which the outer surface 16b of the exhaust pipe 16 can surround with a press fit.

The spring element 48 can be formed in the radial direction R with waveform, wherein preferably the wave amplitude, based on an imaginary center plane M of the spring element 48 , can decrease radially outward. This can be achieved that smaller loads in the radial direction on the exhaust pipe 16 to a deformation of the spring element 48 in the immediate vicinity of the exhaust pipe, but not in the vicinity of the attachment of the spring element on the inner edge 46 the opening 44 to lead.

The spring element 48 can be formed for example of metal by punching.

The spring element 48 can be more or less than those in 4 shown axial deflection points 52 exhibit.

By the in 4 The structure shown may be the spring element 48 not just some movement of the exhaust pipe 16 allow in the radial direction, but also in the axial direction, such as when the exhaust pipe 16 expands in the direction of its longitudinal axis L in operation due to the occurring elevated temperatures.

In 4 below, a second embodiment of the spring element is shown. In the second embodiment, the same or functionally identical components or component sections are provided with the same reference numerals as in the first embodiment, but increased by the number 100 ,

The second embodiment in the lower half of 4 is explained below only insofar as it differs from the first embodiment of the upper half of the image, the description of which is otherwise expressly referenced.

The spring element 148 The second embodiment is formed bellows-like, ie between its clamping point 150 on the inner edge 146 and its radially inner edge 148a there is a clear axial offset in the direction of the longitudinal axis L of the exhaust pipe 16 , The spring element 148 has, like that of the first embodiment, in a longitudinal axis L of the exhaust pipe 16 longitudinal section containing a meandering cross-sectional contour, wherein the spring element at the axial vertices 152 not necessarily, as in 4 shown must be deflected by almost 180 °. Rather, at these points, the cross section of the spring element can be deflected only by about 90 ° or less.

Also with the second embodiment of the spring element 148 can be both a radial and an axial movement of the exhaust pipe 16 relative to the opening 146 of the functional housing 124 be allowed.

The bellows-like spring element 148 The second embodiment may be made, for example, by hydroforming a flat sheet metal blank.

In 5 are two other embodiments of a possible determination of the exhaust pipe 16 shown on a functional housing.

The basic idea behind the specifications in 5 is, is that, a holding element 260 which is an opening 244 in a functional housing 224 in the radial direction R up to an inner edge 246 the opening 244 bridged, in a radially closer to the exhaust pipe 16 located, preferably to the exhaust pipe 16 adjoining area 261 predominantly or completely formed from a metal, such as a metal disc 262 at its radially inner edge 262a by press fitting, soldering or welding and the like with the outer surface 16b of the exhaust pipe 16 can be connected.

Radially further out is with the metallic element 262 a ring 264 made of high temperature resistant plastic, such as by injection molding and / or by positive connection by openings 266 the metallic disc 262 from the plastic of the plastic ring 264 are interspersed.

To the plastic ring 264 can be further radially outward another plastic ring 268 connect, which from a less temperature-resistant plastic may be formed as the plastic ring 264 , as this radially further outward further plastic ring 268 is thermally less loaded, in particular less heated than the closer to the exhaust pipe 16 located plastic ring 264 ,

The plastic rings 264 and 268 can be glued together or otherwise connected at their common interface. Preferably, they are welded together.

Preferably, the plastic of the further plastic ring 268 with the plastic of the functional housing 224 at least in the area of the inner edge 246 compatible, so that a material connection between the radially outer edge 268a the further plastic ring 268 and thus the holding element 260 and one the inner edge 246 forming area of the functional housing 224 can be produced without major difficulties, such as by friction or ultrasonic welding. Nevertheless, a bond or / and positive connection between the other plastic ring 268 and the functional housing 224 just as impossible to be excluded as between the plastic ring 268 and the radially inner plastic ring 264 ,

In the holding element 260 the upper half of the picture 5 So is the radially inward of the exhaust pipe 16 outgoing area formed of thermally high-strength metal, at the radially outer at least one plastic for connection to the functional housing is mounted.

In the case of providing a plurality of plastic elements in the radial direction outward on the holding element 260 can be chosen for cost reasons advantageously with increasing radial distance from the exhaust pipe an ever less temperature-resistant plastic.

In the lower half of 5 a second embodiment of a retaining element is exemplified, wherein the same or functionally identical components or component portions are provided with the same reference numerals as in the first embodiment, but increased by the number 100 ,

The essential difference between the second embodiment discussed below and the previously discussed first embodiment of the retaining element consists essentially in that the plastic element or the plastic ring 364 to the radially inner metallic element 362 is injected. For this purpose, the metallic element at its radially outer edge an axial gradation 370 have around the wetted by plastic surface of the metallic element 362 increase and so the bond strength between the metallic element 362 and the plastic ring 364 to increase.

Between two in the radial direction of the holding element 360 or also of the retaining element 260 successive elements, a primer layer can be applied to at least one of the elements in order to improve the connection strength with the radially adjacent element.

The second embodiment of the retaining element 360 allows the formation of slender in the axial direction, ie stressing little space, holding elements.

In the two cases of holding elements discussed above, the metallic element can act as a spring element 48 or 148 or basically designed as a spring element in the context of the present invention.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 29617845 U1 [0030, 0039]

Claims (20)

Automotive exhaust gas routing device with a functional housing ( 24 ; 124 ; 224 ; 324 ), such as silencer housings, further with a longitudinal direction in an inlet opening of the functional housing ( 24 ; 124 ; 224 ; 324 ) opening exhaust gas inlet channel and with one of an outlet opening of the functional housing ( 24 ; 124 ; 224 ; 324 ) along an outlet direction from the functional housing ( 24 ; 124 ; 224 ; 324 ) leading exhaust gas outlet duct, wherein an inner edge ( 46 ; 146 ; 246 ; 346 ) at least one opening ( 44 ; 144 ; 244 ; 344 ) from the inlet opening and the outlet opening with respect to a respective longitudinal axis (L) of the at least one opening ( 44 ; 144 ; 244 ; 344 ) associated exhaust gas channel ( 16 ) from exhaust inlet channel and exhaust outlet channel, radial distance from an outer surface ( 16b ) of the exhaust gas channel ( 16 ) is provided, characterized in that radially between the outer surface ( 16b ) at least one exhaust gas channel ( 16 ) from exhaust inlet channel and exhaust outlet channel and the inner edge ( 46 ; 146 ; 246 ; 346 ) of the respective exhaust gas channel ( 16 ) associated opening ( 44 ; 144 ; 244 ; 344 ) from the inlet opening and outlet opening a spring element ( 48 ; 148 ) is provided, which against its spring force in the region of the opening ( 44 ; 144 ; 244 ; 344 ) a radial movement of the exhaust gas channel ( 16 ) relative to the inner edge ( 46 ; 146 ; 246 ; 346 ) or away from it. Automotive exhaust gas routing device according to claim 1, characterized in that the spring element ( 48 . 148 ) is a spring washer which the exhaust duct ( 16 ), which with a radially inner edge ( 48a ; 148a ) with the exhaust gas channel ( 16 ) and which with a radially outer edge (at 50 ; at 150 ) with the inner edge ( 46 ; 146 ; 246 ; 346 ) of the associated opening ( 44 ; 144 ; 244 ; 344 ) connected is. Automotive exhaust gas routing device according to claim 1 or 2, characterized in that the radially inner edge ( 48a ; 148a ) of the spring element ( 48 . 148 ) is positively or / and non-positively, in particular frictionally engaged, and / or materially connected to the exhaust gas channel. Automotive exhaust gas routing device according to one of the preceding claims, characterized in that the spring element ( 48 . 148 ) in a longitudinal section along a longitudinal axis (L) of the respective exhaust gas channel ( 16 ) in the region of the opening ( 44 ; 144 ; 244 ; 344 ), at least partially in the radial direction wavy course, preferably with different deflection, more preferably with the exhaust gas channel ( 16 ) of increasing deflection from a center line (M) of a wavy course having portion. Automotive exhaust gas routing device according to one of the preceding claims, characterized in that the spring element ( 148 ) is designed as a bellows or bellows-like shape. Automotive exhaust gas routing device according to one of the preceding claims, characterized in that the spring element ( 48 . 148 ) is formed predominantly, preferably completely, of metal, and in that further the functional housing ( 24 ; 124 ; 224 ; 324 ) at least at the inner edge ( 46 ; 146 ; 246 ; 346 ) forming region, preferably predominantly, particularly preferably completely, is formed from plastic. Automotive exhaust gas routing device with a functional housing ( 24 ; 124 ; 224 ; 324 ), such as silencer housings, further with a longitudinal direction in an inlet opening of the functional housing ( 24 ; 124 ; 224 ; 324 ) opening exhaust gas inlet channel and with one of an outlet opening along an outlet direction of the functional housing ( 24 ; 124 ; 224 ; 324 ) leading exhaust gas outlet duct, wherein an inner edge ( 46 ; 146 ; 246 ; 346 ) at least one opening ( 44 ; 144 ; 244 ; 344 ) from the inlet opening and the outlet opening with respect to a respective longitudinal axis (L) of the at least one opening ( 44 ; 144 ; 244 ; 344 ) associated exhaust gas channel ( 16 ) from exhaust inlet channel and exhaust outlet channel, radial distance from an outer surface ( 16b ) of the exhaust gas channel ( 16 ) is provided, characterized in that radially between the outer surface ( 16b ) of the at least one exhaust gas channel ( 16 ) from exhaust inlet channel and exhaust outlet channel and the inner edge ( 46 ; 146 ; 246 ; 346 ) of the respective exhaust gas channel ( 16 ) associated opening ( 44 ; 144 ; 244 ; 344 ) from the inlet opening and outlet opening a holding element ( 260 . 360 ) is provided, with which the exhaust gas channel ( 16 ) on the functional housing ( 24 ; 124 ; 224 ; 324 ), wherein the retaining element ( 260 ; 360 ) in a radially inner, the exhaust gas channel ( 16 ) closer section ( 261 ; 361 ) comprises a metal and in a radially outer, the exhaust gas channel ( 16 ) further section a plastic (at 264 , at 268 ; at 364 , at 368 ). Automotive exhaust gas routing device according to claim 7, characterized in that the retaining element ( 260 . 360 ) with a radially inner portion ( 261 ; 361 ) belonging radially inner edge ( 262a ; 362a ) with the exhaust gas channel ( 16 ) and with a radially outer portion belonging radially outer edge ( 268a ; 368a ) with the function housing ( 24 ; 124 ; 224 ; 324 ), preferably with the inner edge ( 46 ; 146 ; 246 ; 346 ) of the associated opening ( 44 ; 144 ; 244 ; 344 ) connected is. Automotive exhaust gas routing device according to claim 6, characterized in that the retaining element ( 260 . 360 ) with its radially inner edge ( 262a ; 362a ) positively and / or non-positively, in particular by friction, or / and cohesively with the exhaust gas channel ( 16 ) connected is. Automotive exhaust gas routing device according to one of claims 7 to 9, characterized in that the retaining element ( 260 . 360 ) In its radially outer portion at least two successive in the radial direction sections (at 264 , at 268 ; at 364 , at 368 ) with different plastics. Automotive exhaust gas routing device according to claim 10, characterized in that the different plastics are arranged radially outwardly with decreasing temperature resistance. Automotive exhaust gas routing device according to one of claims 7 to 11, characterized in that the retaining element ( 260 ; 360 ), in particular at its radially inner portion ( 261 ; 361 ), a spring element ( 48 . 148 ) according to one of claims 1 to 6. Automotive exhaust gas routing device with a functional housing ( 24 ; 124 ; 224 ; 324 ), such as silencer housings, further with a longitudinal direction in an inlet opening of the functional housing ( 24 ; 124 ; 224 ; 324 ) opening exhaust gas inlet channel and with one of an outlet opening along an outlet direction of the functional housing ( 24 ; 124 ; 224 ; 324 ) leading exhaust outlet duct, in particular according to one of the preceding claims, wherein the functional housing ( 24 ; 124 ; 224 ; 324 ) at least one in the assembled state lower shell ( 22 ) and an upper shell ( 26 ), characterized in that the lower shell ( 22 ) at least part of a vehicle underbody paneling ( 14 ). Automotive exhaust gas routing device according to claim 13, characterized in that the lower shell ( 22 ) integral with the vehicle underbody paneling ( 14 ) is trained. Vehicle exhaust gas routing device according to claim 13, characterized in that the lower shell is formed separately from the automotive underbody paneling and completes the vehicle underbody paneling in the assembled state, in particular supplemented so that it contributes to the aerodynamic contour of the vehicle underbody paneling. Automotive exhaust gas routing device according to one of claims 13 to 15, characterized in that the vehicle underbody paneling ( 14 ) in at least two directions, preferably in four directions (FL1, FL2, FQ1, FQ2) via the upper shell (FIG. 26 ) protrudes. Automotive exhaust gas routing device according to one of claims 13 to 16, characterized in that the vehicle underbody paneling ( 14 ) on the upper shell ( 26 ) indicative side and / or the upper shell ( 26 ) on the vehicle underbody paneling ( 14 ) pointing side towards each between the upper shell ( 26 ) and the vehicle underbody paneling ( 14 ) dividing surface T indicative depressions ( 30 . 38 ) exhibit. Automotive exhaust gas routing device according to claim 17, characterized in that at least a part of the depressions ( 30 . 38 ) through from the upper shell ( 26 ) or the vehicle underbody paneling ( 14 ) protruding ribs ( 18a . 18b . 34 . 36 . 28 ) are formed. Automotive exhaust gas routing device according to claim 17 or 18, characterized in that at least a part of the side walls, preferably all side walls of the lower shell ( 22 ) by the vehicle underbody paneling ( 14 ) protruding ribs ( 34 . 36 ) are formed. Automotive exhaust gas routing device according to one of claims 17 to 19, characterized in that at least a part of the depressions ( 30 . 38 ), preferably all depressions ( 30 . 38 ), through a microperforated film ( 32 . 42 ), preferably metal foil, are covered.

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