DE102011016170A1 - Exhaust gas device and method for its production - Google Patents

Abstract

An exhaust-gas-conducting device of a vehicle has a cylindrical outer housing (18) which consists of an outer shell (24) and an inner shell (26) arranged in its interior, wherein the outer shell (24) forms a larger portion of the outer circumference than the inner shell (26 ) or an equal outer peripheral portion. The radial outer side of the inner shell (26) is fixed to the outer shell (24) in particular cohesively. The outer shell (24) is C-shaped in cross-section or extends annularly closed. Furthermore, a method of manufacturing the device will be described.

Description

The invention relates to an exhaust gas leading device of a vehicle having a cylindrical outer housing. Moreover, the invention also relates to a method for producing such a device.

In vehicles, various devices are present in the exhaust system, which are arranged between exhaust pipe sections, such as catalysts, particulate filters, mufflers or housings in which so-called thermoelectric generators (TEG modules) are housed and with which electrical energy is obtained by a temperature difference. All these devices are prefabricated units that are installed in the exhaust system of a vehicle and as a commonality between their inlet and outlet form a container in which internals are housed (exhaust gas-cleaning depositors, muffler installations, TEG modules, etc.). Between the inlet and the outlet, there is a clear jump in cross section to create a cavity for accommodating the internals. The cylindrical outer housing of such devices can be manufactured in different ways. For example, in the case of a catalytic converter or a particulate filter, the so-called inserter, through which the exhaust gas flows and which is usually made of ceramic, is wrapped with a metal sheet in such a way that the insert is clamped and positioned in the housing via an interposed bearing mat. In addition, there are also outer housing of two cross-sectionally U-shaped trays, which clamp between them depositor and bearing mat and are brought together when closing the outer housing so far that their longitudinal edges overlap and the longitudinal edges are then welded or soldered.

From the US 2001/0055551 A1 For example, a method for producing a catalyst is known in which two sheet metal parts each extending more than 360 ° around the insert are wound on top of each other. These then form the outer housing.

The DE 10 2004 042 078 A1 describes a method for producing a housing for a device carrying exhaust gas, in which the outer housing consists of three or more sheet metal strips which partially overlap and are interconnected in the overlapping area. The cross-sectional shape of the housing is not circular cylindrical, but has stronger and less strongly curved sections. In the less curved sections are the overlapping areas.

The object of the invention is to provide a device having an easily manufacturable outer housing, which can be produced inexpensively and is lightweight. Furthermore, an improved method for producing a device is to be specified.

The exhaust gas-conducting device for vehicles according to the invention has a cylindrical outer housing which consists of an outer shell and an inner shell arranged in the interior. The outer shell forms a larger portion of the outer circumference of the outer housing than the inner shell or, alternatively, a same sized portion of the outer periphery as the inner shell. The radial outer side of the inner shell is attached to the outer shell, in particular by material connection. The outer shell is seen in cross-section C-shaped or closed circular.

The device according to the invention is also characterized by a very uniform loading of the outer housing and a uniform clamping of internal parts, because the outer shell mainly takes the burden, and this outer shell forms almost the entire outer circumference of the housing, since they are C-shaped in cross section or even annularly closed and surrounds the inner parts. This is an essential difference to the previous shell solutions, in which the individual shells have a U-shaped cross-section, so no inward, facing each other longitudinal edges. The total of two shells that form the outer housing in the invention are also easier to connect than three or more shells as in the prior art. The inner shell lies, so to speak, in the area of the outer shell in which it is closed, and secures this area.

Preferably, the longitudinal edges of the outer shell are mutually overlapping. The device according to the invention thus according to this embodiment has no outer casing which is wound and in which the longitudinal edges overlap. Namely, this winding can cause the inner longitudinal edge, which migrates strongly during winding, to exert shear forces on the part lying further on the inside, for example on the bearing mat. When closing the outer housing of the device according to the invention, the relative movement can be distributed on two sides, namely in the region of the two longitudinal edges of the inner shell.

The shells are preferably continuously curved in cross-section, that is, there is no abrupt heel or the like, as is often the case with U-shaped shells in the region of the longitudinal edges in the prior art. This reduces the manufacturing costs and ensures a uniform flexibility of the outer housing, because Heels or the like stiffen the housing partially.

The outer and the inner shell are preferably made of a metal sheet.

The curvature of the outer and inner shell should be adapted to each other in the overlapping area, so that the inner shell fully rests with its radial outer side on the outer shell.

According to the preferred embodiment, the longitudinal edges of the outer shell are circumferentially spaced from each other, and the resulting gap between the longitudinal edges is closed radially inwardly by the inner shell. The inner shell thus has in the preferred embodiment, in terms of power, mainly the task of closing this gap in the outer shell, which should be very small. The presence of the gap has the following important advantage. If the outer housing is to clamp an inner part or should fit tightly against it, there is always the problem that the inner part (for example the insert of a catalytic converter or a particle filter) is provided with cross-sectional tolerances. Due to the individual production of the outer housing, matched to the currently to be installed, inner part, by applying a force on the outer shell in the production of the outer housing, the outer shell can be individually pressed and adapted closely to the inner part and adapt, so that an optimal cross-sectional shape of the Outer housing is created. The gap precludes the possibility of the longitudinal edges abutting each other in the case of parts which are small in cross-section, so that the outer housing can not be made small enough. Thus, a tolerance compensation is made possible over the gap. However, it is conceivable to set the tolerances so that for the smallest tolerable inner part of the longitudinal edges just abut each other. However, it is preferred that a gap in the outer housing is provided even for the smallest part.

However, after the gap is relatively small, the inner shell may be made to contribute significantly less to the stability of the outer shell than the outer shell, thereby reducing the weight and manufacturing cost of the inner shell.

The inner shell may, viewed in cross section, have a smaller circumferential length than the outer shell, preferably by at least a factor of 0.6. As a result, material can be saved considerably.

Of course, an inner shell can be used, which has a similar large or even greater circumferential length as the outer shell.

Also, the inner shell may be C-shaped in cross-section, so also have further drawn inward longitudinal edges, as is the case with a U-shape. Alternatively or additionally, the gap should be aligned between the longitudinal edges of the inner shell opposite to the longitudinal edges of the outer shell, in particular to the advantageous gap between the longitudinal edges of the outer shell. In a circular cylindrical outer housing, this can be defined by the fact that the gap between the longitudinal edges of the inner shell is diametrically opposite to the longitudinal edges of the outer shell, in particular to the gap on the outer shell. This is to make the flexibility of the outer case even.

The outer shell should be thicker than the inner shell, in particular at least by a factor of 1.3. This saves material and weight. In addition, it is avoided that the outer housing in the overlapping region of the shells is significantly less elastic than otherwise, not overlapping area.

In experiments, it has been found that the outer shell can have a maximum thickness of 1.0 mm, in particular a maximum of 0.8 mm, and / or the inner shell can have a maximum thickness of 0.4 mm. These thicknesses are much lower than in the prior art, which is used for example in winding housings with wall thicknesses of 1.2 to 1.5 mm.

The preferred embodiment even provides that the outer shell has a maximum thickness of 0.4, in particular 0.3 mm and the inner shell is only a maximum of 0.2 mm thick. The small thickness straight of the inner shell not only has weight advantages, but also ensures that in the region of the longitudinal edges of the inner shell only a small thickness jump in the outer housing is present. The front edges defining the longitudinal edges thus stand as interference contour or interfering edge for the adjacent part, for example, for the bearing mat, barely inward, so that hardly exerted shear forces on the adjacent part when closing the outer housing. Due to the small thickness, the longitudinal edges can hardly catch on the bearing mat, but slide along it.

The small thickness of the inner and outer shell also means that the stress distribution in the outer housing is very uniform, namely this is more flexible than in the prior art and adapts to the tolerance-related different geometries of the inner parts, for example the depositor, optimal. This also means that the clamping force is distributed very evenly on the inner part.

The small thickness of the outer housing also means that the so-called Canning process during manufacture of the outer housing is faster and that no large springback forces occur, which is to be mastered in the prior art. These spring-back forces cause after opening the tool, which exerts a contact force on the outer housing during its closing operation, the outer housing springs back, assumes a different geometry and the clamping forces in the more resilient section are reduced more.

A further embodiment of the invention provides that the outer shell consists of a different material than the inner shell. Here, additional costs can be saved by, for example, the inner shell consists of a less high-quality material than the outer shell.

The outer shell should form at least 90% of the outer circumference of the housing.

The stability of the outer housing in the region of the longitudinal edges can be increased and the production can be simplified if at least one of the longitudinal edges of the outer shell has at least one extension in the circumferential direction, which engages in a recess on the opposite extension. Extension and recess can be designed in particular complementary. About the extension and the recess, the longitudinal edges are hooked positively in the axial direction, which reduces the burden on the cohesive connection. The preferred embodiment provides that both longitudinal edges can be crenellated, so that the battlements of one longitudinal edge engage in complementary recesses between battlements of the other longitudinal edge. In particular, however, in order to maintain the circumferential gap, the tip of the pinnacles should not contact the "bottoms" of the adjacent recesses. However, there may be contact in the axial direction on the side surfaces of the adjacent pinnacles and recesses.

The longitudinal edges of the outer shell should be soldered to each other and / or with the inner shell, wherein preferably additionally the outer shell in the region of the longitudinal edges with the inner shell is spot-welded. The inner shell can form a bridge between the longitudinal edges, which is why the longitudinal edges of the outer shell are each soldered to the inner shell. If the gap between the longitudinal edges is very small, this gap can also be completely closed with solder, so that this solder also connects the longitudinal edges of the outer shell. It would be possible that the gap is completely filled with solder.

Preferably, solder is also provided between the inside of the outer shell in the region of its longitudinal edges and the outer side of the inner shell in this area, so that a großflächigerer, soldered area is formed. If the inner shell overlaps the outer shell very far, it would be conceivable to provide solder only on the inner side near the longitudinal edges of the outer shell, so that not the entire overlapping area of the shells is connected to solder.

The device according to the invention contains an insert for cleaning the exhaust gas (catalyst or particle filter), forms a silencer and / or contains TEG modules. The device is a prefabricated container having inside it internals through which either the exhaust gas is treated or is converted by the energy from the exhaust gas (sound or heat energy).

Another embodiment of the invention provides no prefabrication of the device and also no internals containing container. The device is rather a pipe connection for two adjacent pipe socket. The outer and inner shell surround the two adjacent pipe sockets and couple fluidly with each other. Here, the shells are preferably firmly bonded to the pipe socket. Since the pipe sockets do not always have exact external dimensions and geometries, can be achieved by the two compressible shells always an optimal, gap-free adjustment to the nozzle.

However, the device according to the invention can also be composed of two shells exhaust pipe of an internal combustion engine. Here, it is advantageous if at least the inner shell in the cross-section closed, so no gap between the longitudinal edges of the inner shell is present, or if this gap is completely closed by solder. It is also advantageous if the shells are made of different materials, so that different corrosion resistances are fulfilled. The exhaust pipe is thus lighter overall, because its wall thickness can be lower than in previous exhaust pipes.

• a) Positionieren einer Außenschale und einer Innenschale so zueinander, dass sich die Außenschale C-förmig um die Innenschale und sich die Innenschale innenseitig von einem Längsrand zum gegenüberliegenden Längsrand der Außenschale erstreckt, und
• b) stoffschlüssiges Verbinden der Außen- und der Innenschale miteinander im Bereich der Längsränder der Außenschale.

The method according to the invention for producing an exhaust-gas-conducting device, in particular an abovementioned exhaust device according to the invention, provides the following steps:

• a) positioning an outer shell and an inner shell to each other so that the outer shell C-shaped around the inner shell and the inner shell inside of a longitudinal edge extends to the opposite longitudinal edge of the outer shell, and
• b) cohesive bonding of the outer and the inner shell with each other in the region of the longitudinal edges of the outer shell.

As already explained, the two shells should be smoothly curved continuously, seen in relation to the cross section. The outer and inner shell are not wound, that is, they extend less than 360 ° in cross section.

The outer and the inner shell are soldered together, in particular in the so-called continuous process, by being moved through a continuous furnace in which the solder is liquefied.

A very effective method of production provides that a solder is applied to the outer shell on the inside in the area of the longitudinal edges and / or on the outside of the inner shell (for example by screen printing), which has hardened before the shells are positioned relative to one another. In the above step b) then at least one of the shells is heated so that the solder is liquid and the shells are soldered together.

As an alternative to printing on solder, one or more solder foils could also be fastened on one or both opposite sides of the shells, e.g. B. by spot welding. The films then melt when exposed to heat.

The shells can be soldered to the stiffening over the entire surface or distributed over their contact surfaces. On one or both shells Lot is printed, z. B. over the entire surface or in patterns such as stripes, grids, dots, etc. After heating results in a full-area or partial solder joint. Even if solder is printed in patterns, this can become a full-surface connection after heating.

The full-surface or section-wise solder connection takes place in particular in the region of points at which parts are fastened from the outside in order to stiffen the wall in this area.

Since the tools for closing the shells that exert pressure on the shells from the outside are usually very expensive, so that their cycle time should be as low as possible, the shells can be spot welded together before soldering. Thus, the shells are positioned to each other and can be transported to another tool or another station.

The cycle times of the so-called Canning process for closing the outer housing are reduced from over 30 sec. To less than 7 sec.

The trays may be pre-curved when positioned in a tool having inwardly movable jaws. When these jaws are moved inward, at least. the outer shell further curved so that their longitudinal edges move towards each other. The tool should then be at least a provisional fixation of the shells together, for example by spot welding.

In the preferred embodiment, the jaws are moved inwardly by a determined, individual adjustment path by a parameter determined individually for the device to be produced. This means that each device has an individually manufactured outer housing, matched to parameters of the inner parts, for example, on the cross-sectional geometry of the insert or the force applied when closing the jaws clamping force or the basis weight of the bearing mat.

Further features and advantages of the invention will become apparent from the following description and from the following drawings, to which reference is made. In the drawings show:

1 a longitudinal sectional view through an embodiment of the device according to the invention,

2 a cross-sectional view through a first embodiment of the device according to the invention,

3 a cross-sectional view through a second embodiment of the device according to the invention,

4 a radial view of the devices 2 and 3 in the area of the longitudinal edges,

5 a perspective cross-sectional view through a tool for producing the device according to the invention,

6 successive process steps for explaining the method according to the invention;

7 a longitudinal sectional view through an executed as a pipe socket connection device according to the invention,

8th a perspective view of the device according to 7 , and

9 an end view of an exhaust pipe designed as inventive device.

In 1 is a housed in a motor vehicle, exhaust device leading 10 shown. The device 10 may be an exhaust gas purification device, that is an exhaust gas catalyst, a particulate filter, or a combination of both, or a silencer or a power generating device with so-called TEG modules, which are shown by way of example and by the reference numeral 12 are provided.

The reference number 14 defines an elongated, cylindrical substrate made, for example, of a ceramic or a type of wound corrugated cardboard or other catalytic support or filter material, with or without coating. The substrate 14 is from a storage mat 16 surrounded by an elastic compensating element between the substrate 14 and an outer casing 18 made of sheet metal.

The storage mat 16 is also present if other internal parts, such as TEG modules 12 to be clamped on a support, or if sound-absorbing internals from the outer housing 18 be surrounded and clamped in it.

Upstream and downstream are with the outer casing 18 an inflow funnel 20 and a discharge funnel 22 connected.

The device is a prefabricated container with internals having an inlet and an outlet through the inlet of the inlet and outlet of the discharge funnel, respectively 20 respectively. 22 are formed, and an intermediate, in cross-section to the inlet and outlet widened portion to form a cavity for receiving the internals.

The outer housing 18 is designed thin-walled and will be explained in more detail below.

In 2 is to see in a cross section of the structure of the device according to the invention. The outer housing 18 consists of two shells, namely an outer shell 24 and an inner shell 26 , The outer shell 24 has a substantially C-shaped cross-section and surrounds the substrate 14 , This means that the outer shell extends in cross section by more than 180 °, preferably by more than 270 °. The inner shell 26 is in the illustrated embodiment in cross section also C-shaped.

The bowls 24 and 26 have longitudinal edges 28 respectively. 30 , which are each spaced apart, so that a gap 32 respectively. 34 between the longitudinal edges 28 respectively. 30 results. That means the outer shell 24 overlaps in the area of their longitudinal edges 28 as well as the inner shell in the region of their longitudinal edges 30 ,

The outer shell 24 forms the essential part of the outer side of the outer housing in the circumferential direction, in particular, it forms at least 90% of the outer circumference of the outer housing 18 , The inside, from the outer shell 24 covered section of the inner shell 26 does not form any portion of the outer circumference of the outer housing at all 18 but only the section that divides the gap 32 closes.

The gap 32 between the longitudinal edges 28 becomes radially inward from the inner shell 26 closed. The orientation of the outer and inner shell 24 respectively. 26 done so that the column 32 . 34 lie opposite each other, in particular diametrically opposed to each other.

The outer shell 24 exists as well as the inner shell 26 from a uniformly thin sheet.

Because the outer shell 24 the essential part of the outer casing 18 forms, also regarding stability of the outer housing 18 , can the inner shell 26 be made thinner than the outer shell 24 ,

The outer shell 24 should be thicker, in particular, by a factor of 1.3 than the inner shell 26 ,

In the preferred embodiment, it has been found that the outer shell can have a thickness of not more than 1.0 mm, but in particular not more than 0.8 mm, preferably in particular not more than 0.4 mm, whereas the inner shell 26 a maximum thickness of 0.4 mm, in particular of not more than about 0.2 mm.

The outer shell 24 has in the embodiments shown a thickness of even only about 0.3 mm and the inner shell 26 of 0.2 mm, so that in the overlap area of the shells 24 . 26 a total thickness of the outer casing 18 of 0.5 mm.

The outer and inner shell 24 respectively. 26 lie in the overlapping area over the entire surface to each other, which is particularly facilitated by the fact that the outer shell 24 has a small thickness and can adapt to the contour of the internal parts during bending. The inner shell 26 again, because of its even smaller thickness, it is highly flexible and adapts to the contour of the inner, adjacent parts, here the substrate 14 and the overlying storage mat 16 perfect on.

Alternatively or additionally, the outer shell 24 made of a different material than the inner shell 26 consist, in particular of a higher quality, for example, more corrosion resistant material.

The two bowls 24 . 26 are in the area of the longitudinal edges 28 connected to each other cohesively.

According to the preferred embodiment, the shells 24 . 26 in the area of the inside of the outer shell 24 near the longitudinal edges 28 soldered together. The solder extends according to the preferred embodiment about a maximum of 10 to 20 mm from the respective longitudinal edge 28 along the circumference in the respective overlap area.

solder 36 should also have the gap 32 fill, preferably completely fill, so that no gutter, in which moisture could accumulate. At least, Lot should 36 the front sides in the area of the longitudinal edges 28 completely cover, as well as the outside of the inner shell 26 in the area of the gap 32 , so there is no attack surface for corrosion and no gaps between outer and inner shell 24 . 26 available.

In addition to the solder joint are the shells 24 . 26 near the longitudinal edges 28 spot-welded at some axially consecutive points. The welds bear the reference numeral 38 , This spot welding only serves to pre-fix the shells 24 . 26 before this over its entire longitudinal extent in the area of the gap 32 be soldered together. Alternatively, the gap could 32 Be zero, z. B. if the tolerances in the preparation are selected according to so that an upper limit of the circumferential length of the outer shell is defined by a system of its longitudinal edges together. It would also be conceivable that the longitudinal edges 28 the outer shell 24 overlap.

The bowls 24 . 26 can be soldered to the stiffening over the entire surface or distributed over their contact surfaces. On one or both bowls 24 . 26 Lot is printed, z. B. over the entire surface or in patterns such as stripes, grids, dots, etc. After heating results in a full-area or partial solder joint.

The full-surface or section-wise solder connection takes place in particular in the region of points at which parts are fastened from the outside in order to stiffen the wall in this area. In 2 becomes a fastening part 100 to the outer shell 24 soldered. At least over a large area in the area around these solder joints around the shells 24 . 26 soldered together to stiffen the wall where the through the fastener 100 acting forces are absorbed.

If z. For example, if an opening in the wall is required (eg, for a sensor), then both shells will be 24 . 26 provided overlapping holes. At the edge of the hole are the bowls 24 . 26 soldered together to increase the rigidity and optionally to achieve a gas-tightness.

The embodiment according to 2 shows a circular cylindrical device. However, the invention is not limited to such a device, but also refers to other, substantially round or even substantially angular, provided with rounded edges geometries of outer casings 18 ,

3 shows a device with an internal component, for example, a silencer inner part, a substrate 14 or other structures, for example with TEG modules 12 , Optionally, depending on the inside part, there is also a storage mat 16 wrapped around the inside part. The outer housing 18 again consists of only two shells, namely the outer shell 24 and the inner shell 26 , Again, the outer shell runs 24 C-shaped almost completely around the inside parts.

Alternatively to the embodiment according to 2 the inner shell extends 26 but not C-shaped along the inside of the outer shell 24 but runs V- or U-shaped only over a relatively limited angular range in the region of the gap 32 to the outer housing in the gap area 18 close. It should be emphasized, however, that of course in this embodiment, a similar design of the inner shell 26 as in 2 can be present, namely that the inner shell 26 C-shaped extending around almost the entire interior parts. The advantage of the embodiment according to 3 is that the cost of materials for the inner shell 26 is lower than in the previous embodiment. On the other hand, the wall thickness of the outer housing 18 due to the almost over 360 ° overlap of the shells 24 . 26 according to 2 even.

Regarding thicknesses, materials and extensions of the outer and inner shell 24 . 26 applies with respect 3 that too 2 Said. This also applies to the connection of the two trays consisting of sheets 24 . 26 by material connection. The gap 32 is also here with Lot 36 at least lined, preferably filled.

The longitudinal edges 28 can be linear or interlocked, such as 4 shows. In 4 is a crenellated formation of the longitudinal edges 28 shown, with circumferentially extending projections 40 in recesses 42 between the extensions 40 the opposite longitudinal edge 28 intervention. Due to this construction, the still in the circumferential direction column 32 allows, the stability of the outer case 18 increased in the seam area and facilitates the production.

5 shows the tool with which the device according to the invention is produced. The tool has several circular segment-shaped jaws 44 that can be moved inside. The insides 46 the baking 44 are the later form of the outer casing 18 adjusted in the appropriate area.

The cheeks 44 can be moved inward to different degrees (see arrows) so that, depending on individual parameters for the device to be manufactured, for example, on the clamping force exerted on the internal parts or the geometry of the substrate 14 or the basis weight of the installed storage mat 16 depends, the cheeks 44 individually further or less far inward. That is, the adjustment for the jaws 44 is preferably individualized for each device.

Examples of such customized manufacturing are in the WO 2007/115667 A1 to which reference is made. The tool can alternatively also as in the DE 10 2006 049 238 A1 be described described.

The production method for the device according to the invention is described below 6 described.

The two bowls 24 . 26 are first preformed transversely to their longitudinal direction, that is, they have not yet seen their final shape in cross section, but are curved ( 6a ).

Into the tool ( 6b ) are the outer and inner shell 24 . 26 and pushed into this the inner parts. The inner shell 26 is also positioned so that its longitudinal edges 30 on the inside of the outer shell 24 lie. In the area of the longitudinal edges 28 is inside on the outer shell 24 and / or the outside of the inner shell 26 solder 36 , in particular brazing, applied and cured, for example by printing ( 6a ).

The cheeks 44 are then driven inwards, so that the outer shell 24 is narrowed and the longitudinal edges 28 to move towards each other. Also the inner shell 26 is deformed ( 6b and 6c ).

Once the final position ( 6c ) is reached, the shells 24 . 26 in the overlap area near the gap 32 spot-welded. These can be adjacent jaws 44 corresponding recesses 48 for inserting a welding electrode 50 to have ( 6c ).

Subsequently, the prefabricated device from the tool through a continuous furnace 52 ( 6e ), where it is heated until the solder 36 melts. In addition, even solder in the area of the gap 32 be added from the outside ( 6d ). The two bowls 24 . 26 are thus connected cohesively. A heat source 54 in a continuous furnace 52 is also in the 6d and 6e shown.

In the embodiments shown so far, the outer and the inner shell 24 respectively. 26 positioned around the internals and then connected together.

In the embodiment of the 7 and 8th the device is a pipe connection of two spaced apart exhaust pipes, which are in pipe sockets 60 . 62 end up. Inside the device no internals are provided, moreover, there is no large jump in cross section, the outer and the inner shell 24 . 26 may be formed as described in the previous embodiments.

In the embodiment shown, both shells are 24 . 26 in cross-section C-shaped, wherein the slots of the two "C" are diametrically opposite to each other. The bowls 24 . 26 be from the outside on the neck 60 . 62 put on and pressed radially inwards, so that they are on the outer surface of the nozzle 60 . 62 abut, the pipe socket 60 . 62 surrounded and fluidly coupled with each other. The radially inwardly directed force can accordingly 5 be applied.

Furthermore, the opposite longitudinal edges of the shells 24 and or 26 also have interlocking projections, as previously explained.

The bowls 24 . 26 are then materially bonded together at the gap of the outer shell 24 connected. Furthermore, the shells 24 . 26 also a one or two nozzles 60 . 62 cohesively connected, z. B. by soldering or welding.

In order not to let out any exhaust gas, possibly also circulating solder or Welded joints between the shells 24 . 26 and the neck 60 . 62 be provided.

Soldering the shells 24 . 26 can z. B. be done by that on the inside of the outer shell 24 and the outer shell 26 in each case a solder foil is fixed by spot welding. The films melt when exposed to heat and connect the shells 24 . 26 ,

The embodiment according to 9 shows an exhaust pipe of an internal combustion engine, which consists of two shells 24 . 26 is composed. According to the preferred embodiment is between the longitudinal edges 30 the inner shell 24 no gap or only a small gap so that it is completely closed by the solder or the weld. Alternatively or additionally, there is no gap between the longitudinal edges 28 the outer shell available.

Both shells should have no overlapping edges in them. Also in this embodiment, it is advantageous to add parts similar to in connection with 1 the fastening part 100 to fix.

The preferred attachment of the shells 24 . 26 to each other is soldering, in particular full-surface soldering. What is said about the other embodiments applies here, to which reference is made to avoid repetition.

For all embodiments, solder can be applied in a variety of ways: liquid, by printing, by attaching Lotfolien etc.

In all the embodiments shown forms the outer shell 24 a larger portion of the outer periphery than the inner shell 26 , Alternatively, the outer shell could 24 but also the same size section of the outer circumference as the inner shell 26 form.

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

• US 2001/0055551 A1 [0003]
• DE 102004042078 A1 [0004]
• WO 2007/115667 A1 [0082]
• DE 102006049238 A1 [0082]

Claims (24)

Exhaust gas device of a vehicle, with a cylindrical outer housing ( 18 ), which consists of an outer shell ( 24 ) and an inner shell ( 26 ), wherein the outer shell ( 24 ) a larger portion of the outer periphery than the inner shell ( 26 ) or an equal section of the outer circumference as the inner shell ( 26 ), the radial outer side of the inner shell ( 26 ) on the outer shell ( 24 ) is attached in particular cohesively and the outer shell ( 24 ) is closed in cross-section C-shaped or annular. Device according to claim 1, characterized in that the longitudinal edges ( 28 ) of the outer shell ( 24 ) run to each other overlap. Device according to claim 1 or 2, characterized in that the longitudinal edges ( 28 ) of the outer shell ( 24 ) are circumferentially spaced from each other and the resulting gap ( 32 ) between the longitudinal edges ( 28 ) through the inner shell ( 26 ) is closed radially inwardly. Device according to one of the preceding claims, characterized in that the inner shell ( 26 ) seen in cross section has a smaller circumferential length than the outer shell ( 24 ), preferably by at least a factor of 0.6. Device according to one of the preceding claims, characterized in that the inner shell ( 26 ) is C-shaped in cross-section and / or that the gap ( 34 ) between the longitudinal edges ( 30 ) of the inner shell ( 26 ), in a circular cylindrical outer housing ( 18 ) diametrically opposite to the longitudinal edges ( 28 ) of the outer shell ( 24 ) is aligned. Device according to one of the preceding claims, characterized in that the outer shell ( 24 ) is thicker than the inner shell ( 26 ), in particular at least by a factor of 1.3. Apparatus according to claim 6, characterized in that the outer shell ( 24 ) a maximum thickness of 0.8 mm and / or the inner shell ( 26 ) has a maximum thickness of 0.4 mm. Device according to one of the preceding claims, characterized in that the outer shell ( 24 ) of a different material than the inner shell ( 26 ) consists. Device according to one of the preceding claims, characterized in that the outer shell ( 24 ) at least 90% of the outer circumference of the outer housing ( 18 ) in the circumferential direction. Device according to one of the preceding claims, characterized in that at least one of the longitudinal edges ( 28 ) of the outer shell ( 24 ) at least one extension ( 40 ) in the circumferential direction, which in a recess ( 42 ) at the opposite longitudinal edge ( 28 ) intervenes. Device according to one of the preceding claims, characterized in that the longitudinal edges ( 28 ) of the outer shell ( 24 ) with each other and / or with the inner shell ( 26 ), preferably in addition to the inner shell ( 26 ) are spot-welded. Device according to claim 11, characterized in that the longitudinal edges ( 28 ) of the outer shell ( 24 ) forming a gap ( 32 ) are spaced from each other and the gap with solder ( 36 ) is filled. Device according to one of the preceding claims, characterized in that the curvatures of the shells ( 24 . 26 ) are adapted to each other so that the inside of the outer shell ( 24 ) over the entire surface of the inner shell ( 26 ) is present. Device according to one of the preceding claims, characterized in that the device is a prefabricated container with an inlet and an outlet, in particular wherein the container contains an insert for cleaning the exhaust gas, forms a silencer and / or TEG modules ( 12 ) contains. Device according to one of claims 1 to 13, characterized in that the device is a pipe socket connection and the outer and the inner shell ( 24 . 26 ) two adjacent pipe stubs ( 60 . 62 ) and in fluid communication with each other or that the device is an exhaust pipe of an internal combustion engine, with an outer and an inner shell ( 24 . 26 ). Method for producing an exhaust-gas-conducting device of a vehicle, in particular a device according to one of the preceding claims, characterized by the following steps: a) Positioning of an outer shell ( 24 ) and an inner shell ( 26 ) so that the outer shell ( 24 ) C-shaped around the inner shell ( 26 ) and the inner shell ( 26 ) inside the outer shell ( 24 ) from a longitudinal edge ( 28 ) to the opposite longitudinal edge ( 28 ) of the outer shell ( 24 ), and b) cohesive bonding of the outer and the inner shell ( 24 . 26 ) with each other in the region of the longitudinal edges ( 28 ) of the outer shell ( 24 ). A method according to claim 16, characterized in that the outer and the inner shell ( 24 . 26 ) are soldered together, in particular in a continuous process. Method according to claim 17, characterized in that on the outer shell ( 24 ) on the inside in the region of the longitudinal edges ( 28 ) and / or on the outside of the inner shell ( 26 ) a solder is applied and cured before the shells ( 24 . 26 ) and that in step b) by heating at least one of the shells ( 24 . 26 ) the solder becomes liquid to the shells ( 24 . 26 ) to be soldered together. Method according to one of claims 16 to 18, characterized in that the shells ( 24 . 26 ) are spot welded together before soldering. Method according to one of claims 16 to 19, characterized in that the shells ( 24 . 26 ) are pre-curved and positioned in a tool, which inwardly movable jaws ( 44 ), that the jaws ( 44 ) inwards against the outer shell ( 24 ) and at least the outer shell ( 24 ), so that their longitudinal edges ( 28 ) are moved towards each other. Method according to one of claims 16 to 20, characterized in that the jaws ( 44 ) are moved inwardly by an individual adjustment path depending on a parameter determined individually for the device to be produced. Method according to one of claims 16 to 21, characterized in that the outer and the inner shell ( 24 . 26 ) after the inward movement of the jaws ( 44 ) are spot-welded together. Method according to one of claims 16 to 22, characterized in that the device is a container with internals, with an inlet and an outlet and an intermediate, in cross section to the inlet and outlet flared portion, wherein the outer and the inner shell ( 24 . 26 ) are positioned around the internals and then connected together. Method according to one of claims 16 to 22, characterized in that the device is a pipe socket connection, which on an inlet and an outlet side cylindrical pipe socket ( 60 . 62 ) and then connected together.

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