DE10151494A1 - Honeycomb structure, used as carrier for exhaust gas catalyst for automobile IC engine, has open spring damper system formed by sleeve joints in mantle pipe - Google Patents

Abstract

Honeycomb body has a honeycomb structure bonded to mantle pipe by joints. The honeycomb structure is shrouded at least partially by inner and outer sleeves, between the mantle pipe and the honeycomb structure. Adjacent components are bonded together by joints, which form an open spring damper system with at least one sleeve, which has structures to compensate for changes at the circumference of the honeycomb structure. Preferred Features: Honeycomb body (1), used as the catalyst carrier body to clean the exhaust gas of an internal combustion motor, has a honeycomb structure (3) bonded to the mantle pipe (4) by joints. The honeycomb structure is shrouded at least partially by an inner sleeve (5) and an outer sleeve (6), in an axial section between the mantle pipe and the honeycomb structure. Adjacent components are bonded together by joints (8-10), which form an open spring damper system (25) with at least one sleeve. One sleeve and/or the other has structures (26) to compensate for changes at the circumference (12) of the honeycomb structure. The inner joints are formed by welding and especially rolling seam welding or laser welding.

Description

The invention relates to a honeycomb body and a method for its Production, in particular a catalyst carrier body for cleaning an exhaust gas an internal combustion engine, the honeycomb body having a honeycomb structure has, which is connected to a jacket pipe joining technology. such Honeycomb bodies are preferably used in automotive engineering.

Due to the fact that the honeycomb structure and the casing tube mostly consist of different materials, at least from different ones Material thicknesses exist, there is a thermal load on the Honeycomb body (for example, when flowing with hot exhaust gas) to an uneven thermal expansion. This leads to a relative movement of the Honeycomb structure in relation to the casing tube in the axial and radial directions and in Circumferential direction. Consequently, for the operation of such a honeycomb body as Catalyst carrier body in an exhaust system of an internal combustion engine be ensured that the attachment of the honeycomb structure to the casing tube is designed so that this relative movement can absorb or compensate.

In the course of recent developments, honeycomb bodies were initially proposed, which is not over the entire axial length of the honeycomb structure with the Jacket tube are connected. In this way, a different thermal Expansion behavior in the axial direction are made possible. With regard the relative movements in the circumferential direction of the honeycomb structure or in the radial Thin sleeves were suggested towards the casing tube at least partially enclose the honeycomb structure and on different ones Places connected to the honeycomb structure on the one hand and the casing tube on the other are. Such cuffs are additionally with slits or the like provided to the different dimensions of the circumference of the honeycomb structure to be able to compensate for thermal stress.

However, studies have shown that some of the known systems could not ensure a permanent fixation of the honeycomb structure in the casing tube. Especially in the case of the cuff solutions, one was relatively early Material fatigue and / or a detachment of the sleeve from the jacket tube or to recognize the honeycomb structure.

Another solution to compensate for thermal expansion Honeycomb structure is known from DE 38 33 675 A1. There it is suggested between the honeycomb structure and the casing tube to arrange an envelope, which consists of two there are welded metal strips. The connection of the Metal strips are designed so that pillow-like cavities are created, one Variation of the gap width between the honeycomb structure and the casing pipe should intercept. To produce such an enveloping tape, two smooth metal tapes become flat superimposed and connected by means of intersecting weld seams. at a subsequent soldering process to generate connections between the honeycomb structure, the envelope and the jacket tube is by means of a permanent deformation of the two metal strips an expansion of the cavities reached. Such a construction with pillow-like cavities is true suitable, the pressure loads occurring when the honeycomb structure expands to take up in the radial direction, occurring tensile stresses due to This construction was able to shrink the honeycomb structure but not withstand permanently.

Proceeding from this, it is an object of the present invention to provide a system for Fixing a honeycomb structure in a jacket tube to form a To specify the honeycomb body, which permanently connects the honeycomb structure to the Jacket tube ensures, especially when using such Honeycomb body in the exhaust system of an internal combustion engine. Furthermore, a Methods for producing such a honeycomb body are given, wherein a process-reliable design with regard to large series production should be guaranteed.

This object is achieved by a honeycomb body with the features of Claim 1 or with a method with the features of claim 15. Die Describe dependent claims, individually or in combination with each other, particularly advantageous and preferred embodiments of the honeycomb body according to the invention or the method according to the invention.

The inventive, in particular as a catalyst support body for cleaning of an exhaust gas of an internal combustion engine comprises suitable honeycomb bodies a honeycomb structure that is connected to a casing tube by joining technology. The Honeycomb structure is at least partially from an inner sleeve and at least partially surrounded by an outer cuff, the inner and the outer sleeve in an axial section between the casing tube and the Honeycomb structure are arranged. The are arranged next to each other Components connected to each other via a plurality of joints that an open spring-damper system is formed by means of at least one sleeve. In this context, "open" means the spring-damper system at least partially through which a fluid can flow, ie none pillow-like, completely closed cavities are formed. Preferably form the Cuffs channel-like passages, which may also be at one end can be locked. On the one hand, this ensures that the spring-damper System introduced fluid, especially the hot exhaust gas Internal combustion engine, uniform heating of the system; on the other hand, the Connection of the honeycomb structure to the jacket tube by the invention open spring-damper system permanently ensured.

This means that one or both cuffs have elastic properties have a different thermal expansion behavior from the Honeycomb structure is compensated for the casing tube. In particular, this is elastic property ensures that one or both cuffs in are able to deform so elastically that a change in the The distance between adjacent joints is equalized. On the one hand, this applies with a faster expansion of the honeycomb structure in the radial direction and in Circumferential direction with respect to the jacket tube during a cold start phase Internal combustion engine when increasing exhaust gas temperature Heating the honeycomb body leads. On the other hand, this is a spring-damper system also to absorb tensile stress when shrinking faster Honeycomb structure suitable during the cooling process. The different thermal expansion behavior has its origin in the different specific heat capacities of honeycomb structure and tubular casing.

In addition to the elastic property as a spring, the invention Arrangement of the cuffs on a damping property. By that is meant that at least one of the cuffs has a damper or movement retardant has or the two cuffs together act as such a damper. Frictional effects, which are the kinetic ones, are preferably used Convert the honeycomb body's energy into frictional heat, resulting in an enlarged Inertia of the honeycomb structure leads. In particular, the honeycomb structure vibrates significantly less in the case of pressure waves impinging on them, for example due to the combustion processes in the engine of an automobile in an exhaust system occur. These friction effects can consequently be between both accordingly designed sections of a cuff are generated, or the Friction effects are caused by contact with at least one neighboring component (for example the adjacent sleeve, the casing tube or the Honeycomb structure) so that they move relative to each other slide. Depending on the surfaces in the friction zone, there are different ones Damping levels selectable and adjustable, the outer shape, the Surface roughness and / or the materials of the cuffs can be varied. This Designing a damper with cuffs makes use in particular of damping mats or the like superfluous, where appropriate only for additional support when the vibration tendency is particularly high Honeycomb structure can be integrated at least in some areas.

This combination of resilient and cushioning properties Connection of the honeycomb structure to the jacket tube ensures a permanent and stable fixation. Investigations of the honeycomb body according to the invention Operating conditions in the automotive sector, such as during a Driving cycle have shown that the damping mechanisms clearly the Reduce the tendency of the honeycomb to vibrate. This applies both in axial and radial direction, as well as in the circumferential direction. The connection also stopped a large number of such driving cycles, because the respectively occurring different thermal expansions of the honeycomb structure and casing pipe over the resilient property were compensated. Accordingly, with a replacement Joining points or the structural failure of a component (especially the Cuffs) during normal operating conditions in an automobile go out.

A honeycomb structure in particular includes those in automotive engineering used honeycomb structures. This also applies to extruded and ceramic honeycomb structures and in particular metallic ones Honeycomb structures made of corrugated and smooth sheets spiral or s-shaped with each other are devoured. With regard to the external shape of such a honeycomb body cylindrical, conical, oval or similar embodiments are also covered. In this context, the honeycomb structure represents the largest possible Surface available, which is to be provided in particular with a catalyst. The The catalytically active surface is used to convert harmful components of the exhaust gas as it flows through the honeycomb structure.

According to the invention, the honeycomb structure is connected via two Cuffs which are arranged between the honeycomb structure and the casing tube. In principle, however, it is also possible to use more than two cuffs. Separate cuff segments are also included that cover the scope of the Honeycomb structure are arranged distributed; especially if at least one, preferably only the outer, the cuffs from 2 to 6 cuff segments is constructed. For the sake of explanation, it should be disclosed that two adjacent ones Components also have a plurality of connection areas arranged between them can, which are arranged in particular distributed over the circumference. Is too conceivable that only one, preferably completely surrounding connection area is formed. With the expression "joints in the radial direction" is in this Context meant that in the radial direction of the honeycomb body from the inside to the outside depending on the number of components (honeycomb structure, Majority of the sleeves, tubular casing) a certain number of joints are required to attach the honeycomb structure. So are usually at n components (n-1) joints required. The majority of the joints are related thus different types of joints, each connect different components.

The majority are to prevent a too rigid connection of the components of joints so that at most two of the joints in radial Direction are arranged one behind the other. That means that the honeycomb body is in has no completely radial connection, wherein all joints are arranged one behind the other. Based on the scope The honeycomb structure in the radial direction towards the casing tube is the one with the Joints made connection of the honeycomb structure with the casing tube interrupted. This interruption can, for example, directly on the circumference to the inner cuff, between the cuffs or between the outer Cuff and the casing tube are present. Particular attention is paid to one to turn off the axial area of the honeycomb body in which the respectively adjacent Joining points are arranged. That means, for example, that on both sides Attachment to the end faces of the honeycomb structure, each on one Joining points arranged on the end face are to be considered. Consequently, in particular that Design of joints, which are on the radius of the honeycomb body are arranged and in the radial direction directly adjacent to each other to avoid.

According to a further embodiment of the honeycomb body, the inner one Cuff and / or the outer cuff structures to compensate for Changes in the scope of the honeycomb structure. The cuffs are advantageous to produce from structured sheet metal foils, the structuring of the Cuffs also lead to increased stiffness in the axial direction, which especially with regard to a bending load due to radial expansion or Shrinkage of the honeycomb structure is advantageous. These structures stand out in particular by a steady course so that an essentially uniform spring action guaranteed over a portion of the cuff is. A wavy embodiment is one such example Structure sure. This changes with a relative movement to be compensated between the honeycomb structure and the tubular casing, in particular the structural height. A Flattening of the structure thus enables an extension of the Cuff section, so that, for example, a removal of adjacent joints due to thermal expansion is absorbed. While the Honeycomb body to an original alignment of the joints to each other, will bring the joints closer together to an increased structural height implemented.

With regard to the execution of the damping property is further suggested that the structures of the inner and outer cuffs so interlock that neighboring structures of the cuffs at least partially abut each other. The cuffs are together at inner joints connected, whereby the cuffs are naturally arranged close together. It is therefore to create a friction zone between the cuffs For example, this is possible near the inner joint (preferably in one adjacent area up to 1.5 cm, preferably up to 2.5 cm) to be arranged. The Structure height of the interlocking structures are kept relatively small, that the cuffs are not very far apart in this area can. However, it can also make sense for relatively high dynamic loads not to execute the structures up to the joints, but close to them Join the cuffs without creating structures. This will make one improved, long-lasting fastening of the cuffs with the neighboring ones Components guaranteed. In this case, the structures of the neighboring ones take hold Cuffs are more likely to interlock in an area between the joints. The However, cuffs can also be complete, ie over their entire circumference be provided with a structure or be designed as such. To one Generation of friction zones in areas farther from the inner joints A correspondingly adapted structure height can be used in areas, for example. The can also mean that the structure height between the neighboring inner joints varied. In principle, the structures are designed that a frictional force is generated between them, which is essentially radial Direction points to a relative movement of the honeycomb structure and casing tube in to hinder this direction. It makes sense that the structures in the area of the friction zone have sliding surfaces, which are also in the Are arranged essentially in the radial direction.

It is particularly advantageous that the structures have corrugated sleeves are formed, the adjoining joints being at least 2 Structures are spaced apart. In particular at least 3 or 5 Structures arranged between adjacent joints, this also in Dependence of the number of similar joints per perimeter of the honeycomb structure depends (usually 3 to 10 similar joints distributed over the circumference). On Designing the cuffs with at least 2 structures is one sufficient spring elasticity. Thus, a too rigid connection and a corresponding early failure of the attachment of the honeycomb structure on Jacket tube avoided. The arrangement of 3 to 5 structures between neighboring ones Joining points have proven to be particularly advantageous in long-term tests. This The number of structures combined in an extremely compact manner by a spring Damper system because on the one hand adequate compensation of Changes in length of the cuff areas is made possible, and on the other hand the flanks of the structures of the adjoining cuffs form friction zones whose Damping characteristics to a surprisingly clear calming of the Systems honeycomb leads in an exhaust system of an internal combustion engine. A suitable damping property was found for a structure height between 1.5 mm and 0.3 mm were determined, with structural heights of 1.1 mm to 0.6 mm are particularly advantageous.

According to a further embodiment of the honeycomb body, the inner sleeve is connected to the entire circumference of the honeycomb structure, especially soldered. The inner cuff then serves as a kind of base for the spring Damper system for attaching the honeycomb structure to the casing tube. A such a base is advantageous, for example, if the honeycomb structure and the Cuff made of different materials (e.g. ceramic-metal) are, or the honeycomb structure is not self-supporting, but for example from a large number of stacked sheet layers.

According to yet another embodiment, the honeycomb body has an interior Joints between the inner and outer cuff and outer Joining points between the outer sleeve and the casing tube. These several Joints are in each case evenly over the circumference of the honeycomb structure or the cuffs distributed, the directly adjacent inner and outer joints are arranged offset to one another in the circumferential direction. Such a design of the inner and outer joints creates cell-like spaces, which ensure a particularly even absorption of Relative movements of the honeycomb structure with respect to the casing tube are used. Show Both cuffs have similar material properties, so that they are also relatively large Relative movements in the radial direction are evenly compensated can. In this context, however, it must still be ensured that for example, a sufficient number of friction zones are formed.

Research has shown that it is particularly beneficial to use the inner and / or to provide the outer cuff with a cuff thickness that is less than 0.3 mm, preferably even less than 0.2 mm. The cuff thickness lies in a range approximately between the thickness range of Walls of the honeycomb structure (<0.05 mm) and the thickness of the casing tube (1 to 2 mm) is to be settled. Such cuffs can also be used, for example Microstructures and / or the structural integrity of the honeycomb structure influence particularly advantageous. Such cuffs also work, for example from EP 454 712 B1 and EP 784 507 B1.

According to yet another embodiment, the inner and / or outer ones Joints together an extension that is less than 30%, especially even less than 20% and preferably less than 15% of the circumference of the honeycomb structure is. This means, for example, that 5 such joints with one Single extension in the circumferential direction of 10 mm together an extension of 50 mm result. With a circumference of the honeycomb structure of approx. 250 mm percentage of the joints compared to the circumference at 20%. The number the similar joints and their width is application-specific to be selected and varies in particular between 3 and 7 similar joints an individual extension of 3 mm to 10 mm (preferably between 3 mm and 6 mm). The strip-shaped joints on the one hand ensure that a large and consequently possibly too stiff version of the Joining points is avoided, although a permanent connection of the neighboring components during high thermal and dynamic Stresses is ensured, such as in the exhaust system Internal combustion engine occur.

According to a further embodiment, the inner and outer joints are arranged offset to one another in the axial direction of the honeycomb structure. Next a displacement of the inner and outer joints in the circumferential direction is here the second possibility presented in what form can be avoided that in the radial direction of the honeycomb body, all joints directly one behind the other are arranged adjacent. In this context, axially offset means that the joints have an expansion in the axial direction, there being none Section plane perpendicular to the axis of the honeycomb body, in the one continuous connection from honeycomb structure to the casing tube in the radial direction exist.

According to yet another embodiment, the axial section has one of on that between 40% and 100% of the dimension of the honeycomb body in axial Direction is. A connection in only a limited axial section of the The honeycomb structure represents an axial expansion or contraction of the Honeycomb structure independent of the thermal expansion behavior of the jacket tube for sure. The arrangement of this axial section is relative to the honeycomb structure here application-specific.

For example, high pressure loads occur and only relatively low thermal expansion, it may be advantageous to the axial section starting from an end face of the honeycomb structure with a length between 10 mm and 40 mm, in particular between 20 mm and 30 mm. The Axial section is preferred in the operation of such a honeycomb body arranged that the axial section is aligned towards the exhaust gas inlet side. The length of the axial section is essentially determined by the length the cuffs or the edges of the joints or the connections bounded between the inner sleeve and the honeycomb structure. Conclude for example the cuffs and / or the joints or the connection with from the end faces of the honeycomb structure, the length corresponds to the axial Distance of the axial length of the honeycomb structure.

With a particularly high thermal load on the honeycomb body occurs possibly a barrel-like shape of the previously cylindrical shape Honeycomb structure. It comes with this barrel-like deformation in particular to a significant shrinkage of the end faces, so that in this case It is more advantageous to close the axial area near the center between the end faces position. The connection using the spring-damper system then only has to perform lesser compensation operations, such as a unimpeded thermal expansion behavior of the end faces of the honeycomb structure is made possible.

It is particularly advantageous to form the honeycomb structure with sheet metal layers are at least partially structured so that an exhaust gas can flow through them Form channels. The honeycomb structure in particular has a channel density of at least 800 cpsi ("cells per square inch"). The sheets of the sheet layers have a sheet thickness that is preferably less than 0.025 mm.

According to yet another embodiment, the joints and / or the Structures of the cuffs arranged so that an annular gap between the Jacket tube and the honeycomb structure for a flowing through the honeycomb body Exhaust gas is sealed. This means that there is a bypass flow at the Honeycomb structure as during the operation of such a honeycomb body Catalyst carrier body in the exhaust system of an internal combustion engine almost is completely avoided. This means that future and particularly high ones Requirements for the purity of the exhaust gas released into the environment be respected.

Furthermore, a honeycomb body is proposed in which at least two inner ones and / or outer cuffs are provided, these in each case to one another are arranged axially spaced apart. It is particularly preferred here an arrangement with an inner sleeve, which is essentially over the extends the entire extent of the honeycomb structure or its circumference, wherein two outer sleeves are axially spaced apart. The reason for one such axial spacing is the thermal expansion of the honeycomb structure and / or the sleeves and / or the casing tube during the use of a such honeycomb body in the exhaust system of a mobile Internal combustion engine (e.g. diesel or gasoline engine). The honeycomb body is in one preferred flow direction flows, so that significant temperature gradients arise just during the heating phase or cold start phase. This is not the case only in the radial direction but also in the direction of the flow direction. Looking further at the different heat capacities of the individual Components, is even at a substantially uniformly heated Honeycomb body has a different thermal expansion in the axial direction Direction. Because this phenomenon occurs with longer honeycomb bodies or honeycomb structures can be observed increasingly, there is one "Interrupted" connection with axially spaced sleeves, especially at Honeycomb structures with an expansion of over 90 mm. Depending on the use of the Honeycomb body and / or the maximum temperatures occurring in use Such an arrangement may also only be necessary for extensions greater than 120 mm or 150 mm required to maintain the structural integrity of the honeycomb body in the exhaust system to ensure permanently.

Another way to compensate for the axial thermal Expansion behavior is at least one inner and / or at least one outer Provide cuff with at least one microstructure. These run advantageously in the direction of the circumference of the honeycomb structure and form a kind of "bellows" so that the length of the cuff is in the axial direction can change. Such microstructures are derived, for example, from the EP 454 712 B1. In EP 784 507 B1 there are also intersections Microstructures described, which on the one hand compensate for the allow thermal expansion in different or multiple directions, on the other hand, the kink-free forming in several directions allow so that an undesirable increase in stiffness of the cuff here is simply balanced or avoided.

• - Herstellen von Manschettenrohlingen,
• - Ausbilden der inneren Fügestellen zwischen den Manschettenrohlingen,
• - Wickeln der Manschettenrohlinge zu einer inneren Manschette und einer äußeren Manschette,
• - Verbinden der Enden der Manschettenrohlinge,
• - Einbringen der mindestens einen inneren Manschette und äußeren Manschette in ein Mantelrohr,
• - Einführen einer Wabenstruktur in die innere Manschette, und
• - Ausbilden von Fügestellen.

According to a further aspect of the invention, a method for producing a honeycomb body according to the invention is proposed, which comprises at least the following steps:

• - manufacture of blank cuffs,
• - Forming the inner joints between the cuff blanks,
• Winding the cuff blanks into an inner cuff and an outer cuff,
• - connecting the ends of the cuff blanks,
• Introduction of the at least one inner sleeve and outer sleeve into a casing tube,
• - inserting a honeycomb structure into the inner sleeve, and
• - Forming joints.

To explain the term "blank cuff" it should be noted at this point that this is to be understood in particular as metal foils or sheets which have to be subsequently shaped or joined to the essentially cylindrical shape of the cuffs. This process is accomplished with the step of joining the ends of the cuff blanks. In this respect, it is preferably assumed that the cuffs are manufactured using a band-shaped material as the raw material. The cuff blanks are generated by separating them from the band-shaped raw material. It is initially irrelevant whether a structure is introduced into these metal foil blanks (before or after separation) or only in the assembled form as a sleeve. Under certain circumstances, it can be sensible from a solar point of view to pass several band-shaped raw materials simultaneously through a device for producing a (common, same) structure. Further details on the process steps listed are now explained in more detail below or, for example, with reference to FIG. 11.

According to a development of the method, at least two Cuff blanks are first calibrated together before the inner joints be formed. That means the two cuff blanks which preferably have a similar structure (in particular with regard to a corrugation height and a wave length), if possible very precisely and together with their ends finally aligned so that the wave crests or the wave troughs the structures are aligned. This package of blank cuffs is now passed through a calibration device which has the output Compensate manufacturing tolerances of the device for introducing the structure. In particular, the corrugation height is reduced, with a predetermined value can be adhered to exactly. Such a calibration device works, for example also EP 938 380 B1. Then the inner joints trained, the cuff blanks are now rigidly connected to each other and relative movement to one another is prevented. The one described here The procedure is a particularly preferred one, so that, for example, when Lack of a device for jointly inserting one structure into several band-shaped raw materials, if necessary also a calibration of the individual Cuff blanks can be made.

After a further embodiment of the method, the inner joints by means of a welding process, in particular the Roll seam welding or laser welding. A welded joint holds As is well known, it was exposed to high thermal and dynamic loads such as these for example in an exhaust system of a mobile internal combustion engine are to be found. However, there is another advantage to be mentioned here: is particularly important with regard to the process reliability of the method. So is among other things the thermal load on the cuffs Joining process relatively limited (spatial). Furthermore, the use of Solder material is dispensed with, which may lead to a connection of the two Cuffs beyond the desired area of the inner joints can lead. This would have clearly noticeable changes in the springy and / or damping properties of the spring-damper system according to the invention Episode.

Roll seam welding is mentioned here as being particularly preferred. At the Roll seam welding is practically a continuous spot welding according to the resistance pressure welding principle, but this is included roller-shaped electrodes performed. In contrast to resistance spot welding the electrodes remain attached after the first welding spot has been created and keep spinning. In the places where there is a weld spot A new current flow should occur, which causes the material to melt at this point. Depending on the feed speed of the Electrodes and the frequency of the welding current are point seams or Sealing seams created with overlapping welding lenses. With continuous direct current also generated a sealing seam.

According to a development of the method, it is also advantageous to connect the ends of the cuff blanks by means of a welding process to carry out, in particular roller seam welding or laser welding. Here offers especially roll seam welding, because the Cuff blanks usually already in one guide after or during the winding process are arranged so that the combination with a pressure welding process directly in the Connection brings cost and time advantages. In addition, the characteristics of the Spring damper system is not significantly affected when the ends of the Overlapping cuff blanks for performing roll seam welding are arranged, since this method nevertheless ensures a permanent connection, when all four ends are stacked and a common one Connection should arise.

According to a development of the method, the outer cuff is placed in front of the Insert into the jacket tube with solder foil to form external joints Mistake. The use of solder foil has the advantage of being very good precisely delimited joints with a subsequent thermal treatment be formed. An anti-twist device is also implemented, since the solder foil exactly according to the arrangement of the existing internal joints can be aligned. Appropriate soldering of the jacket pipe would when inserting the cuffs an adjustment process of the inner and outer Join points, which is simply avoided here. To this Method step should also be noted that possibly also for the formation of the outer A welding process can be suitable for joints, for example if an exact alignment of the inner and outer joints is ensured and the weld seam from the outside (through the jacket tube) can be manufactured.

According to a further embodiment of the method, the honeycomb structure is turned on their circumference starting from an end face via an offset with a Provide passivation before inserting it into the inner sleeve. The Offset has the function here, for example, that when soldering the honeycomb structure no solder powder can get between the inner and outer sleeve, and thus an undesired change in the properties of the spring damper System is avoided. This will go even further with a passivation of the Circumference of the honeycomb structure from the front to the cuff (s) supported. Known paints, oils, waxes, coatings can be used as passivation or the like can be used, which limit the solder flow or the Prevent build-up of solder. It may also be sufficient if this passivation is only arranged over a partial area of the offset.

According to a further embodiment of the method, the assembled components then, in particular from one end face, with a Adhesive and / or a solder powder brought into contact, after which means a thermal treatment, in particular a high-temperature vacuum Soldering process, at least one connection and / or at least one external one Joining point is generated. This means that the honeycomb structure is preferred is formed from corrugated and smooth sheets, is only soldered when he is located inside the two sleeves and the casing tube. On such a method is described for example in WO 99/37432. The Adhesive or the adhesive is preferably applied on the end face, whereby this by means of the capillary effect in the inner areas of the channels. The Lot is then, for example, by immersing the components in a Solder powder bath introduced into the channels, where it adheres to the adhesive. As a result the thermal treatment melts the solder and accumulates on adjacent arranged or abutting components. When cooling hardens the solder again and creates a technical connection in it Area. These connections are very corrosion and temperature resistant.

Further advantageous and particularly preferred embodiments of the honeycomb body according to the invention and particularly preferred process steps for Production of such a honeycomb body will be explained in more detail with reference to the drawings explained. However, the invention is not limited to the illustrated embodiments limited. They show schematically:

Fig. 1 is an end view of an embodiment of the honeycomb body,

Fig. 2 is an end view of another embodiment of the honeycomb body,

Fig. 3 is a sectional view of a honeycomb body, different embodiments of the joints are shown,

Fig. 4 shows the structure of a mobile emission control system,

Fig. 5 is a detail view of an embodiment of the honeycomb structure with a collar,

Fig. 6 is a detailed view of an embodiment of the spring-damper system,

Fig. 7 is a photograph of an embodiment of the inner and outer sleeve,

Fig. 8 is a sectional view of a honeycomb body, in which an embodiment is shown having axially spaced collars,

Fig. 9 is an exploded view of an embodiment of the wide spring-damper system,

Fig. 10 is a detailed view of a cuff, and

Fig. 11 is a flowchart of a method for manufacturing a honeycomb body of the invention.

Figs. 1 and 2 show schematically, and is suitable in an end view of a honeycomb body 1 (not shown), in particular as a catalyst carrier body for purifying an exhaust gas of an internal combustion engine 2. The honeycomb body 1 comprises a honeycomb structure 3 , which is connected to a casing tube 4 in terms of joining technology, the honeycomb structure 3 being at least partially surrounded by an inner sleeve 5 and at least partially by an outer sleeve 6 . The inner sleeve 5 and the outer sleeve 6 are arranged in an axial section 7 (not shown) between the casing tube 4 and the honeycomb structure 3 . The honeycomb body 1 is characterized in that the adjacently arranged components (in the radial direction 11 from the inside to the outside: honeycomb structure 3 , inner sleeve 5 , outer sleeve 6 , jacket tube 4 ) are connected to one another via a plurality of joints 8 , 9 , 10 are that the sleeves 5 , 6 form an open spring-damper system 25 . The open spring-damper system 25 is formed with structures 26 in the sleeves 5 , 6 , which are arranged between adjacent joints 8 , 9 , 10 .

To avoid a too rigid connection of the honeycomb structure 3 to the casing tube 4 , at most two of the joints 8 , 10 are arranged one behind the other in the radial direction. In the embodiment shown, the inner sleeve 5 is connected to the honeycomb structure 3 via a connection 8 , which extends completely over the circumference 12 of the honeycomb structure 3 . Alternatively, a plurality of connections 8 of the inner sleeve 5 could be arranged distributed over the circumference 12 of the honeycomb structure 3 .

From Figs. 1 and 2 shows that the illustrated embodiments each having a plurality of inner joints 9 between the inner sleeve and the outer sleeve 6 as well as a plurality of outer joining points 10 between the outer sleeve 6 and the casing tube 4, the uniformly over the circumference 12 the honeycomb structure 3 are arranged distributed. The directly adjacent inner joints 9 and outer joints 10 are arranged offset to one another in the circumferential direction.

In FIG. 1, an embodiment of the honeycomb body 1 is shown having two collars having 5 and 6, which completely surround the honeycomb structure 3. In contrast to this, FIG. 2 shows an embodiment with cuff segments, so that a plurality of mutually independent spring damping systems are formed. Mixed forms comprising an inner sleeve 5 , which are fastened over the entire circumference 12 of the honeycomb structure 3 , in combination with a plurality of sleeve segments as an outer sleeve 6 are also possible. The majority of the joints in the radial direction 11 form spaces 24 which result in the positive effects described above with regard to the service life of such a honeycomb body 1 . The inner joints 9 and / or the outer joints 10 have an extension 14 in the circumferential direction, which is preferably less than 8 mm and in particular approximately 5 mm.

Fig. 3 shows schematically a sectional view of two different embodiments of the spring-damping system with regard to the connection of a honeycomb structure 3 to a jacket tube 4.

The connection shown in FIG. 3 above comprises an inner sleeve 5 and an outer sleeve 6 , which end with the end faces 16 of the honeycomb structure 3 . In this way, relatively long levers are produced in the axial direction 15 , so that even large relative movements in the radial direction 11 can be compensated for without causing excessive creasing or the like of the sleeves 5 and / or 6 . Near the end face 16 , the honeycomb structure 3 and the inner sleeve 5 are soldered to one another via a connection 8 in the radial direction 11 . Another connection is formed by the outer joint 10 between the outer sleeve 6 and the casing tube 5 . The honeycomb structure 3 is also soldered to the inner sleeve 5 on the opposite end face. A first joint 9 was also formed directly adjacent to this between the inner sleeve 5 and the outer sleeve 6 . A connection of the outer sleeve 6 to the casing tube 4 was not carried out in this area, so that only the connection 8 and the inner joint 9 are arranged one behind the other in the radial direction 11 . It should also be noted here that the channels 19 (not shown) of the honeycomb structure 3 extend substantially parallel to the axis 33 , so that an exhaust gas can flow through the honeycomb structure 3 starting from an end face 16 .

A further embodiment of the fixing of the honeycomb structure in the casing tube 4 is shown at the bottom in FIG. 3. Here, the inner sleeve 5 and the outer sleeve 6 are arranged in an axial section 7 between the casing tube 4 and the honeycomb structure 3 , which, starting from an end face 16 of the honeycomb structure 3, has a length 17 of between 10 mm and 40 mm. In the embodiment shown, spaces 24 are formed with the inner sleeve 5 and the outer sleeve 6 and the inner joints 9 near the edges of the section 7 , which change their outer shape during a relative movement, in particular in the radial direction 11 of the honeycomb structure 3 relative to the casing tube 4 ,

FIG. 4 schematically shows the structure of an exhaust gas cleaning system, an exhaust gas being generated in an internal combustion engine 4 , which exhaust gas is then passed into an exhaust gas cleaning system 23 . In this exhaust gas cleaning system, for example, a honeycomb body 1 is arranged, which serves as a catalyst carrier body for cleaning the exhaust gas. The honeycomb body 1 then has a catalytically active coating, which serves to convert pollutants contained in the exhaust gas.

Fig. 5 shows a detail view of a honeycomb structure 3 with an inner sleeve 5. The honeycomb structure 1 has sheet metal layers 18 which are at least partially structured so that they form channels 19 through which an exhaust gas can flow. The honeycomb structure has a channel density of at least 800 cpsi, in particular of more than 1000 cpsi. The sheet metal layers comprise smooth and corrugated sheets 20 with a sheet thickness 21 which is less than 0.025 mm.

The honeycomb structure 3 shown is connected over the entire circumference (not shown) to the inner sleeve 5 via the connection 8 . The inner sleeve 5 has a sleeve thickness 13 which is in the range from 0.3 to 0.1 mm. On the inner sleeve 5 , a strip-shaped inner joint 9 is also shown, which is used for connection to the outer sleeve 6 (not shown).

Fig. 6 is a detailed view showing schematically one embodiment of a spring-damper system 25. The inner sleeve 5 and the outer sleeve 6 both have structures 26 to compensate for changes in the circumference 12 of the honeycomb structure 3 (not shown). In the embodiment shown, the sleeves 5 , 6 consist of corrugated sheet metal foils, so that the sleeves 5 , 6 are constructed completely and without gaps from structures 26 . The structures 26 thus also engage in one another near an inner joint 9 between the inner 5 and the outer sleeve 6 in such a way that adjacent structures 26 of the sleeves 5 , 6 abut one another at least partially. In this way, at least one friction zone 27 is generated, which hinders a relative movement 28 (indicated by the double arrow) of the sleeves 5 , 6 with respect to one another. The inner joint 9 is here spaced from the adjacent outer joint 10 by 3 structures 26 of the outer sleeve 6 . To ensure precisely dimensioned boundaries of the inner joints 9 , at least one sleeve between the adjacent inner joints 9 is provided with a passivation 29 . The passivation ensures that no solder adheres in these areas, which can lead to undesired changes in the spring and / or damping properties. A so-called solder stop or any coating with similar properties is particularly suitable as a passivation.

As can be seen from this FIG. 6, a leg-like configuration of the open spring-damper system 25 is also possible. This means that the sleeves 5 and 6 are only segment-like, an inner sleeve segment essentially extending only from the connection 8 (not shown) to a single inner joint 9 , and an outer sleeve segment extending from the same individual inner joint 9 extends to the outer joint 10 . Consequently, the sleeve segments arranged opposite each other in the radial direction 11 (not shown) each have only a single inner joint 9 , which is preferably designed in the form of a strip in the axial direction of the honeycomb body 1 (not shown). The result of this is that the open spring-damper system 25 is open not only in the axial direction but also in a circumferential view. The function of the spring-damper system 25 is now ensured in that at least one leg (sleeve segments) has a structure 26 and can thus compensate for relative movements of the joints 8 , 9 , 10 with respect to one another. Furthermore, the vibrations are damped by the fact that the adjacent legs slide on one another during opening and closing (friction zone 27 ), the kinetic energy being at least partially converted into frictional heat.

Fig. 7 shows a photo of an embodiment of the inner sleeve 5 and outer sleeve 6 in detail. In the upper area of the photo, the casing tube 4 can be seen, which is made stronger than the smooth and corrugated sheets 20 forming the honeycomb structure 3 . The inner sleeve 5 and the outer sleeve 6 have the same material thicknesses here, which are between those of the casing tube 4 and the sheets 20 . Both cuffs have a structure 26 . The inner sleeve 5 is soldered to the honeycomb structure 3 in the area of the connection 8 . The inner joint 9 can be seen in the right section of the figure. In the area of the honeycomb body 1 shown , the outer sleeve 6 is spaced from the casing tube 4 , so that a radial thermal expansion of the honeycomb structure 3 is ensured in use. The structures 26 near the inner joint 9 form a friction zone 27 , which enables the desired damping properties of the system.

In FIG. 8 is a sectional view of a honeycomb body is shown with axially spaced-apart collars. In the honeycomb body 1 , two inner sleeves 5 and two outer sleeves 6 are provided, each of which is arranged axially spaced apart from one another. The reason for such an axial spacing is the thermal expansion of the honeycomb structure 3 and / or the sleeves 5 , 6 and / or the casing tube 4 during the use of such a honeycomb body 1 in the exhaust system of a mobile internal combustion engine. Since the phenomenon of thermal expansion in the direction of the axis 33 can be observed increasingly with honeycomb bodies 1 or honeycomb structures 3 that are becoming longer, such a connection with axially spaced sleeves 5 , 6 is particularly suitable for honeycomb structures 3 with an expansion 30 of over 90 mm.

The sleeves 5 , 6 are here offset on the circumference 12 (not shown) of the honeycomb structure 3, starting from the end faces 16 . This offset 36 is in the range from 3 to 15 mm, a passivation 26 being able to be provided here, for example. The offset 36 thus has the function that when soldering the honeycomb structure 3, no solder powder can get between the inner sleeve 5 and the outer sleeve 6 , and an undesired change in the properties of the spring-damper system is thus avoided.

With regard to the technical connections, it should also be explained that the inner sleeve 5 is completely connected to the honeycomb structure 3 via the circumference 12 (not shown) (connection 8 ). An inner joint 9 and an outer joint 10 were shown schematically here on the radially opposite sides. The mirror-symmetrical design of the two axially spaced sleeves 5 , 6 may be advantageous with regard to thermal expansion that is as unobstructed as possible, but also axially essentially aligned designs of the disputed joints are sometimes useful (especially from a production-specific point of view).

Fig. 9 is an exploded view of an embodiment of the spring far Dämpungs system. The honeycomb body 1 comprises, from the inside to the outside, a honeycomb structure 3 formed with sheets 20 , an inner sleeve 5 , an outer sleeve 6 and a jacket tube 4 . These components are arranged essentially coaxially with an axis 33 . In the illustrated embodiment, the inner sleeve 5 is provided with intersecting microstructures 32 , the outer sleeve 6 being provided only with individual microstructures 32 in the direction of the circumference to compensate for the axial thermal expansion behavior. The number and the geometry of the microstructures 32 essentially depend on the conditions of use of the honeycomb body 1 .

Fig. 10 shows a detail view of an external, applied to the jacket tube 4 cuff 6, which was prepared from a strip-shaped raw material or a sleeve blank. For this purpose, the ends 45 of the sleeve blank were arranged to overlap and connected to one another via a seam 34 . The width 35 of the seam 34 is determined in particular by the joining method, wherein widths 34 of between 0.5 and 3 mm, for example, are possible when using roller seam welding. In the illustrated embodiment, the ends 45 have no structure 26 , which can be reduced, for example, due to the joining process. Although only the ends 45 of the outer sleeve 6 are shown here, a similar connection of the ends 45 of the inner sleeve 5 (not shown) can also be carried out, preferably at the same time forming an inner joint 9 (not shown).

• - Herstellen von Manschettenrohlingen 44 (vgl. Schritte 1. bis 3.),
• - Ausbilden der inneren Fügestellen 9 zwischen den Manschettenrohlingen 44 (vgl. Schritt 4.),
• - Wickeln der Manschettenrohlinge 44 zu einer inneren Manschette S und einer äußeren Manschette 6 (vgl. Schritt 5.),
• - Verbinden der Enden 45 der Manschettenrohlinge 44 (vgl. Schritt 6.),
• - Einbringen der mindestens einen inneren Manschette 5 und äußeren Manschette 6 in ein Mantelrohr 4 (vgl. Schritt 7.),
• - Einführen einer Wabenstruktur 3 in die innere Manschette 5 (vgl. Schritt 8.), und
• - Ausbilden von Fügestellen 8, 10 (vgl. Schritte 9. und 10.).

Fig. 11 shows a possible procedure describes the method for producing a honeycomb body 1 according to the invention. This procedure includes the following steps:

• - Manufacture of cuff blanks 44 (see steps 1 to 3),
• - Forming the inner joints 9 between the sleeve blanks 44 (see step 4. ),
• Winding the sleeve blanks 44 into an inner sleeve S and an outer sleeve 6 (cf. step 5. ),
• Connecting the ends 45 of the cuff blanks 44 (see step 6. ),
• Introduction of the at least one inner sleeve 5 and outer sleeve 6 into a casing tube 4 (cf. step 7. ),
• Insertion of a honeycomb structure 3 into the inner sleeve 5 (cf. step 8. ), And
• - Forming joints 8 , 10 (see steps 9 and 10).

First, a structure 26 is introduced into the band 37 in a known manner in a band 37 made of metal by means of two rotating corrugating rollers 38 (step 1 ). This structured belt 37 is then transported to a cutting device 39 , cuff blanks 44 having the required dimensions being separated (step 2 ). While here only one band 37 runs through the corrugated rollers 38 and / or the cutting device 39 , two bands 37 can also be structured and / or separated together in order to obtain structures 26 of the sleeves 5 , 6 which are subsequently to be joined together as uniformly as possible. Alternatively or in addition, the at least two cuff blanks 44 are subsequently calibrated individually or (as shown) together in a calibration device 40 (step 3 ) before the inner joints 9 are formed (step 4 ). The inner joints 9 are preferably formed by means of a welding process, in particular roller seam welding. This process is carried out with the welding device 41 shown . Now the cuff blanks 44 connected to one another for technical joining are fed to a winding station 42 , in which the cuff blanks 44 are formed into an inner cuff 5 and an outer cuff 6 which have already been joined together (step 6 ). The ends 45 of the sleeve blanks 44 are in turn connected by means of a welding process, the seam 34 formed by the welding device 41 simultaneously connecting all four ends 45 of the sleeve blanks 44 and thereby also generating an inner joint 9 (not marked) (step 6 ). Now the outer sleeve 6 is provided on the outside with solder foil 43 to form outer joints 10 with a jacket tube 4 and introduced into the jacket tube 4 (step 7 ). After appropriate positioning of the cuffs 5, 6 in the interior of the jacket tube 4, the insertion follows (not shown) of, for example, by stacking and / or winding sheet metal 20 produced honeycomb structure 3 in the jacket tube 4, so that the cuffs 5, 6 are arranged between the honeycomb structure 3 and the casing tube 4 (step 8 ). Then the assembled components 1 , 3 , 4 , 5 , 6 , in particular from an end face 16 , are brought into contact with an adhesive and / or a solder 46 (step 9 ). For this purpose, the honeycomb body 1 can, for example, be immersed on the face side in a container 47 with adhesive and / or solder 46 . When Hafimittel a capillary effect, provides an distribution inside the honeycomb body 1, this is for at a powdered solder 46th B. achieved with a known fluidized bed. Finally, at least one connection 8 and / or at least one outer joint 10 is produced by means of a thermal treatment, in particular a high-temperature vacuum soldering process (step 10 ). For this purpose, the honeycomb body 1 is preferably exposed to a reduced atmosphere in an oven 48 . The present invention describes a particularly long-lasting spring damping system for fixing a honeycomb structure in a casing tube, so that the honeycomb body resulting therefrom can be used as a catalyst carrier body in an exhaust system of a mobile internal combustion engine, a significantly improved service life of such a honeycomb body being determined under these operating conditions has been. Furthermore, a method for producing such a honeycomb body is described that also for large-scale production. LIST OF REFERENCES 1 Honeycombs
2 internal combustion engine
3 honeycomb structure
4 jacket tube
5 inner cuff
6 Outer cuff
7 section
8 connection
9 Inner joint
10 Outer joint
11 Radial direction
12 scope
13 cuff thickness
14 extension
15 axial direction
16 end face
17 length
18 sheet layer
19 channel
20 sheet
21 sheet thickness
22 Annular gap
23 exhaust system
24 room
25 spring damper system
26 structure
27 friction zone
28 Relative movement
29 passivation
30 expansion
31 distance
32 microstructure
33 axis
34 seam
35 width
36 offset
37 volume
38 corrugated roller
39 cutting device
40 calibration device
41 welding device
42 winding station
43 solder foil
44 cuff blank
45 end
46 Lot
47 containers
48 oven

Claims (21)

1. honeycomb body ( 1 ), in particular a catalyst carrier body for cleaning an exhaust gas of an internal combustion engine ( 2 ), comprising a honeycomb structure ( 3 ), which is connected by joining technology to a casing tube ( 4 ), the honeycomb structure ( 3 ) at least partially from an inner sleeve ( 5 ) and is at least partially surrounded by an outer sleeve ( 6 ), the inner ( 5 ) and the outer sleeve ( 6 ) also being arranged in an axial section ( 7 ) between the casing tube ( 4 ) and the honeycomb structure ( 3 ) are characterized in that the adjacently arranged components ( 3 , 5 , 6 , 4 ) are connected to one another via a plurality of joints ( 8 , 9 , 10 ) in such a way that by means of at least one sleeve ( 5 , 6 ) an open spring Damper system ( 25 ) is formed. 2. honeycomb body ( 1 ) according to claim 1, characterized in that the inner sleeve ( 5 ) and / or the outer sleeve ( 6 ) has structures ( 26 ) to compensate for changes in the circumference ( 12 ) of the honeycomb structure ( 3 ). 3. honeycomb body ( 1 ) according to claim 2, wherein the sleeves ( 5 , 6 ) have structures ( 26 ), characterized in that the structures ( 26 ) of the inner ( 5 ) and the outer sleeve ( 6 ) engage in one another so that Adjacent structures of the sleeves ( 5 , 6 ) lie at least partially against one another. 4. honeycomb body ( 1 ) according to claim 2 or 3, characterized in that the structures ( 26 ) are formed by corrugated sleeves ( 5 , 6 ), the adjacent joint ( 8 , 9 , 10 ) at least 2 structures ( 26 ) from each other are spaced. 5. honeycomb body ( 1 ) according to one of claims 1 to 4, characterized in that the inner sleeve ( 5 ) over the entire circumference ( 12 ) of the honeycomb structure ( 3 ) is connected to this, in particular soldered. 6. honeycomb body ( 1 ) according to any one of claims 1 to 5, characterized in that inner joints ( 9 ) between the inner ( 5 ) and the outer sleeve ( 6 ) and outer joints ( 10 ) between the outer sleeve ( 6 ) and the casing tube ( 4 ) are arranged distributed uniformly over the circumference ( 12 ) of the honeycomb structure ( 3 ), the directly adjacent inner ( 9 ) and outer joints ( 10 ) being arranged offset to one another in the circumferential direction. 7. honeycomb body ( 1 ) according to one of claims 1 to 6, characterized in that the inner ( 5 ) and / or the outer sleeve ( 6 ) has a sleeve thickness ( 13 ) less than 0.3 mm, preferably even less than 0.2 mm. 8. honeycomb body ( 1 ) according to one of claims 1 to 7, characterized in that the inner ( 9 ) and / or outer joints ( 10 ) together an extent ( 14 ) in the circumferential direction of less than 30% of the circumference ( 12 ) of the honeycomb structure ( 3 ), preferably even less than 20%. 9. honeycomb body ( 1 ) according to any one of claims 1 to 8, characterized in that the inner ( 9 ) and outer joints ( 10 ) in the axial direction ( 15 ) of the honeycomb structure ( 3 ) are arranged offset to one another. 10. honeycomb body ( 1 ) according to one of claims 1 to 9, characterized in that the axial section ( 7 ) has a length ( 17 ) which is between 40% and 100% of the dimension of the honeycomb body ( 1 ) in the axial direction ( 15 ) is. 11. honeycomb body ( 1 ) according to any one of claims 1 to 10, characterized in that the honeycomb structure ( 3 ) has sheet metal layers ( 18 ) which are at least partially structured so that they form channels ( 19 ) through which an exhaust gas can flow, the Honeycomb structure ( 3 ) in particular has a channel density of at least 800 cpsi and the sheet metal layers ( 18 ) are made with sheets ( 20 ) with a sheet thickness ( 21 ), preferably less than 0.025 mm. 12. honeycomb body ( 1 ) according to any one of claims 1 to 11, characterized in that the joints ( 8 , 9 , 10 ) and / or the structures ( 26 ) are arranged such that an annular gap ( 22 ) between the casing tube ( 4th ) and the honeycomb structure ( 3 ) for an exhaust gas flowing through the honeycomb body ( 1 ) is sealed. 13. Honeycomb body according to one of claims 1 to 12, characterized in that at least two inner ( 5 ) and / or outer sleeves ( 6 ) are provided, each of which is arranged axially spaced from one another ( 31 ). 14. Honeycomb body according to one of claims 1 to 13, characterized in that at least one inner ( 5 ) and / or at least one outer sleeve ( 6 ) has at least one microstructure ( 32 ). 15. A method for producing a honeycomb body according to one of claims 1 to 14 comprising the following steps: - manufacture of blank cuffs ( 44 ), - Forming the inner joints ( 9 ) between the sleeve blanks ( 44 ), - winding the sleeve blanks ( 44 ) into an inner sleeve ( 5 ) and an outer sleeve ( 6 ), - connecting the ends ( 45 ) of the cuff blanks ( 44 ), - Introducing the at least one inner sleeve ( 5 ) and outer sleeve ( 6 ) into a casing tube ( 4 ), - Introducing a honeycomb structure ( 3 ) into the inner sleeve ( 5 ), and - Forming joints ( 8 , 10 ). 16. The method according to claim 15, wherein at least two cuff blanks ( 44 ) are first calibrated together before the inner joints ( 9 ) are formed. 17. The method according to claim 15 or 16, wherein the formation of the inner joints ( 9 ) by means of a welding process, in particular roller seam welding or laser welding. 18. The method according to any one of claims 15 to 17, in which the ends ( 45 ) of the sleeve blanks ( 44 ) are connected by means of a welding process, in particular roller seam welding or laser welding. 19. The method according to any one of claims 15 to 18, wherein the outer sleeve ( 6 ) is provided with solder foil ( 43 ) to form outer joints ( 10 ) before being introduced into the casing tube ( 4 ). 20. The method according to any one of claims 15 to 19, wherein the honeycomb structure ( 3 ) on its circumference ( 12 ) is provided with a passivation ( 29 ) starting from an end face ( 16 ) via an offset ( 36 ) before this passivation inner cuff ( 5 ) is inserted. 21. The method according to any one of claims 15 to 20, in which the assembled components ( 3 , 4 , 5 , 6 ) are subsequently, in particular from one end face ( 16 ), brought into contact with an adhesive and / or a solder powder, and then at least one connection ( 8 ) and / or at least one outer joint ( 10 ) is produced by means of a thermal treatment, in particular a high-temperature vacuum soldering process.