EP2640487A2

EP2640487A2 - Particle separator having a multi-part housing

Info

Publication number: EP2640487A2
Application number: EP11776185.8A
Authority: EP
Inventors: Joachim Sittig; Michael Voit; Ferdi Kurth; Ludwig Wieres
Original assignee: Emitec Gesellschaft fuer Emissionstechnologie mbH
Current assignee: Vitesco Technologies Lohmar Verwaltungs GmbH
Priority date: 2010-11-19
Filing date: 2011-10-28
Publication date: 2013-09-25
Also published as: WO2012065831A2; JP2014501869A; RU2013127605A; CN103221112A; WO2012065831A3; US20130247548A1; DE102010051712A1; KR20130093150A

Abstract

The invention relates to a particle separator (1) for treating exhaust gases from an internal combustion engine (2), wherein at least one metal layer (3) through which exhaust gas can flow is disposed in a housing (4) having an inlet opening (5), an outlet opening (6) and a central axis (7), wherein the housing (4) comprises a first part (8) having a first joint face (10) and a second part (9) having a second joint face (11), wherein the first joint face (10) and the second joint face (11) correspond to one another, so that the first part (8) and the second part (9) can be positioned along the central axis (7) relative to one another and the at least one metal layer (3) is spaced over the entire surface from the first joint face (10) and the second joint face (11) over the entire periphery. A particle separator and a method for producing same is proposed, which can be manufactured cost-effectively in a simple manner with few means and in particular is suitable for retrofitting to an existing exhaust system.

Description

The present invention relates to a particle separator for the treatment of exhaust gases of an internal combustion engine, wherein the housing of the particle separator is made of several parts. The invention finds particular application in mobile internal combustion engines, as provided for example in motor vehicles.

The exhaust gas of an internal combustion engine regularly contains pollutants and solids, which are currently being removed in consideration of the corresponding regulations for the protection of health and the environment. With regard to the solids has already been proposed, components of the fuel, such. B. soot or unburned hydrocarbons, sulfur compounds, etc. from the exhaust to filter out and then (catalytically and / or thermally and / or chemically) to eliminate or convert. For this purpose, it is known to use filters which have, for example, a porous wall on or in which these solids are retained.

In addition to these, resulting from the burned fuel solids additional particles can be carried in the exhaust gas, which have a different origin and are orders of magnitude larger than these solids. Internal combustion engines and the associated exhaust systems are often subject to strong vibrations during operation. As a result, particles, in particular in the form of chips, pieces of coatings and deposits, parts of exhaust gas treatment units can become detached and, entrained by the exhaust gas flow, damage subsequent components by the impact of the impact. In addition, these particles can lead to increased abrasion in moving components in the exhaust system, in particular a turbocharger or turbocompressor, due to the increased friction effect in sealing gaps. In addition, exhaust systems are known which recirculate part of the exhaust gas generated back to the internal combustion engine (EGR / EGR: exhaust gas recirculation), so that in this case There is also the risk that the internal combustion engine is exposed to such particles and thereby takes damage.

It has now been found that the retained particles can cause problems with increasing operating time. It should be noted that these particles are, for example, ceramic and / or metallic and are not reacted in the exhaust system. Consequently, these particles accumulate in the exhaust system z. B. in the vicinity of a Partikelabscheiders and / or meet again on this. Such an accumulation of particles can lead to a local or fluctuating pressure loss in the exhaust gas flow, which can result in undesirable (power-reducing) effects in the internal combustion engine and / or the exhaust system. In addition, in this case, the load on the particle separator increases, so that the stability of the particle separator becomes increasingly important.

In addition, it could also be determined in the case of flat particle separators of this type that the composite of a sieve layer and the housing was in some cases technically very complicated and thus also cost-intensive. In addition, it was also observed that this composite also partially dissolved in continuous operation, which in part produced new (metallic) particles, which then endangered downstream components of the exhaust system. On this basis, it is an object of the present invention at least partially to solve the technical problems described with reference to the prior art. In particular, a particle is to be specified for the treatment of exhaust gases, which remains stable despite high loads from large particles and at the same time is easy to manufacture. For this purpose, a method for its production will be proposed.

These objects are achieved with a particle separator and a method for its production according to the features of the independent claims. Further advantageous embodiments of the arrangement are specified in the dependent formulated patent claims. It It should be noted that the features listed individually in the subclaims can be combined with one another in any technologically meaningful manner and show further embodiments of the invention. The description, in particular in conjunction with the figures, illustrates the invention and provides further embodiments.

The particle separator according to the invention for treating exhaust gases of an internal combustion engine has at least one metallic layer through which exhaust gas can flow in a housing having an inlet opening, an outlet opening and a center axis, the housing having a first part with a first joining surface and a second part with a second joining surface wherein the first joining surface and the second joining surface correspond to one another and the at least one metallic layer completely spaces the first joining surface and the second joining surface.

The particle separator according to the invention for treating exhaust gases of an internal combustion engine has at least one metallic layer through which an exhaust gas can flow in a housing having an inlet opening, an outlet opening, a cross section and a center axis, the at least one metallic layer having at least one corrugation having the cross section of the Spanned housing. With a particle here particular device is addressed, the z. B. (ceramic and / or metallic) chips, splinters, chunks, etc. withholds that have been replaced by a component of the exhaust system, for example due to the vibrations during operation and / or the pulsation of the exhaust stream and / or aging. In particular, it is possible to retain those particles which have become detached from a ceramic or ceramic-coated honeycomb body. Also, less stable particles due to the momentum in conjunction with the rigidity or inertia of the particle separator can be divided into smaller particles which are harmless for further downstream components. The metallic layer which can be flowed through for the exhaust gas is designed precisely with regard to the retention of the abovementioned particles. It is preferred here that only one (single) metallic layer is used. Optionally, it may be implemented with multiple layers (eg, a first layer for sifting out the particles and a second layer for fixing the first layer in the housing), which layers are then preferably soldered together, welded, sintered, or the like. In particular, the metallic layer thus represents a (single) planar structure that (completely) spans the cross-section of the housing so that no flow past the metallic layer is possible. The metallic layer is designed so robust or dimensionally stable that it can permanently withstand the conditions (in particular the contact with the particles) at the site of the exhaust system.

The metallic layer can be embodied, for example, as a perforated plate, as a grid plate or the like. In addition, the metallic layer may (preferably) be embodied as a fabric which comprises regularly and / or irregularly arranged wires, filaments and / or chips. Also, scrims and wraps formed with wires, filaments and / or chips can be used. These wires, filaments and / or chips can z. B. by resistance welding, sintering and / or soldering together. In particular, the metallic layer is characterized by its permeability to exhaust gases, with a very low pressure loss occurs. By "metallic" is meant in particular an iron-containing and / or aluminum-containing metallic alloy.The housing is usually a metal jacket that is adapted to the shape of the exhaust pipe.The housing can be made of pipe material with various cross-sectional shapes round, oval, square In particular, here a substantially cylindrical housing is used, which, for example, between the other used adjoining parts of the exhaust pipe and can be welded to them.

The exhaust gas regularly flows through the inlet opening into the housing and the exhaust gas exits via the outlet opening. The center axis of the housing runs regularly through the geometric centroid of the inlet opening and the outlet opening, while the center axis may possibly also be curved when the housing has a bend. So she forms z. For example, in a cylindrical embodiment, the center axis through the center of the circular cross-section. The cross-section of the housing between the inlet opening and outlet opening is considered perpendicular to the center axis and may have varying area sizes and / or surface shapes. However, it is preferred that the size and shape of the cross section along the center axis is the same, ie inlet opening, cross section and outlet opening are the same in this respect. With regard to the position of the at least one metallic layer in the housing, it is preferred that it does not extend beyond the inlet opening or the outlet opening.

In the present case, the housing is designed in several parts, namely with at least two parts. The first part of the housing and the second part of the housing have mutually facing (pointing in the direction of the center axis) joining surfaces which correspond to each other in such a way that they stacked together form a housing which is mounted in a suitable location in an exhaust system , Such joining surfaces are created in particular by a separation process of a one-piece housing, so that the corresponding joining surfaces have once formed the immediate contact surfaces of the housing. Furthermore, the joining surfaces preferably correspond in such a way that (elastic and / or plastic) deformations of the metallic layer due to the positioning of the housing parts to each other is taken into account such that the metallic layer (gas) tight against the joining surfaces. Incidentally, it should be pointed out here that the joining areas in particular special are not formed with flanges or the like, so essentially correspond only to the material thickness of the wall of the housing.

The metallic layer is also arranged such to the housing or to the first part and the second part, that the first joining surface and the second joining surface are fully spaced. In particular, the first joining surface and the second joining surface are (only) spaced uniformly around the circumference by the thickness of the metallic layer. In other words, this also expresses that the gap between the housing parts after assembly of the individual components is completely filled by the metallic layer (and possibly connecting means such as solder, etc.). Consequently, the gap has substantially the dimension of the thickness of the metallic layer. This ensures that no gas-permeable gaps between the metallic layer and the first part or second part of the housing arise.

In an advantageous embodiment of the particle separator, the first joining surface and the second joining surface are not in a flat plane. By "flat plane" is meant above all a plane in the mathematical sense which extends through the particle separator at an angle to the center axis, in contrast to which it is preferred that both joining surfaces are in a (multiply) curved, in particular wave-shaped, plane This results in the housing in the circumferential direction also a wave-shaped course of the joining surfaces.

In an advantageous embodiment of the particle separator, the at least one metallic layer is clamped together by means of the first part and the second part by an outer housing. The metallic layer is in this case positioned or fixed between the first part and the second part by means of their joining surfaces in the direction of the center axis. An outer housing is disposed (partially) around the first part and the second part and (preferably) spaced apart from the metallic layer externally connected to the first part and the second part, respectively. The connection of the housing parts with the outer housing can both by plugging, clamping, screws or cohesively, z. "Bonded" joints are the compounds in which the bonding partners are held together by atomic or molecular forces, in particular, the first part and the second part and the metallic layer are joined together only by frictional engagement with the stress In other words, this means in particular that the metallic layer is (only) held or clamped between the parts of the (inner) housing (ie there no material connections are necessary), wherein the holding force required for this purpose by means of the outer housing The outer housing is arranged outside in the manner of a sleeve and is connected to the respective part of the inner housing near the inlet opening and the outlet opening (eg by means of a soldered joint or a welded connection) lying parts of Gehä uses and the outer housing a kind of circumferential cavity, can extend into the outer protruding portions of the metallic layer inside. In an advantageous embodiment of the particle separator, the outer housing in the region of the mutually positioned corresponding first joining surface and second joining surface of the housing at a distance. By this distance, the metallic layer can be positioned radially by the outer housing, for. B. abuts in the outer protruding portions of the metallic layer (in a change in position during operation) to the outer housing. In addition, the leakage of exhaust gas is reliably prevented in this case by the circumferential cavity and the gas-tight connection of the outer housing to the housing parts. The outer housing may also be part of an existing exhaust system, eg. B. an exhaust pipe to be.

According to a development of the particle separator, the at least one metallic layer has a machined edge, which is arranged at least partially outside the housing. The metallic layer is often cut out of a strip material. This creates cut or welded areas in the edge region, which may have a modified permeability to exhaust gas and / or may have partially loose or labile components that could dissolve during operation. Therefore, it is advantageous if at least one such part of a machined edge is arranged outside the housing, in particular in the peripheral cavity formed with the outer housing. The machined edge may additionally be provided with a seam (eg formed with an additional metal foil) and / or reinforcing means (eg additives, welds, etc.) in order, for example, to permanently withstand the clamping forces of the housing parts.

In an advantageous embodiment of the particle separator, the at least one metallic layer at least partially contacts the outer housing. This can be achieved that the metallic layer radially positioned by the outer housing, and / or that by selective heating, for. As point resistance welding, a solid or at least secure connection between the metallic layer and the outer casing can be made from the outside, without a complicated assembly from the inside is necessary.

As a metallic layer is for example a nonwoven into consideration, which has sintered wire filaments with each other. This can preferably be described with at least one of the following features:

Diameter of wire filaments: between 20 and 50 μm [micrometer]; in particular constructed with two different types

(mixed and / or bonded) wire filaments (e.g., 20 to 25 μm on the one hand and 38 μm to 42 μm on the other hand);

Basis weight of the nonwoven: between 350 g / mm ² and 550 g / mm ² [grams per square millimeter];

- Air permeability of the nonwoven: between 2300 and 3500 l / m ² / s [liters per square meter and second].

Such a web can be used to retain soot and / or other particulate matter in the exhaust gas. In a further advantageous embodiment of the particle separator, the at least one metallic layer has openings with a width in a range of at least 0.05 mm [millimeters]. It is very particularly preferred that this only has openings which have at least an extension of 0.05 mm. In this case, the metallic layer preferably has a separation effect (only) for particles larger than the openings. Very particular preference is that the openings have a maximum width of 0.25 mm, in particular in the range of 0.1 to 0.2 mm. In particular, those particles which may damage or clog downstream (downstream) components of the exhaust system are to be retained by the particle separator. At the same time, however, the largest possible openings should be provided, which thus offer the lowest possible flow resistance. A (priority) implementation of solids from the combustion of fuel (gasoline, diesel, etc.) is not in the foreground here.

According to a further aspect of the invention, a method for producing a particle separator is proposed. In this case, the particle separator has an outer housing, a metallic layer through which exhaust gas can flow, a first part of a housing having a first joining surface and having a first outer circumference, and a second part of a housing having a second joining surface and having a second outer circumference, wherein the first part and the second part correspond to each other, comprising at least the following steps:

- arranging the metallic layer between the first part and the second part, wherein the first joining surface and the second joining surface are facing each other;

Jamming the metallic layer by merging the first part and the second part;

- Sliding the outer housing over the first outer periphery of the first part and the second outer periphery of the second part;

Joining the outer housing with the first part and the second part outside of a region of the first joining surface and second joining surface. The method is particularly suitable for the production of the particle separator with outer housing described above. In this respect, all the aspects listed there are also to be considered here. The outer housing may be designed in the manner of a sleeve, sleeve or the like as a separate, individual component which can be pushed over the first outer circumference of the first part and the second outer circumference of the second part. Also, the outer housing may be a portion of the exhaust pipe. The first part with its first joining surface and its first outer circumference will in particular be tubular. The second part with its second joining surface and its second outer circumference is manufactured in particular according to the nature of the first part. The first outer circumference and the second outer circumference correspond in the way that the first part and the second part can be inserted into the outer housing in the assembled state. In particular, the first and the second outer circumference are the same, at least in the region of the first joining surface and the second joining surface. The first joining surface and the second joining surface preferably also correspond in such a way that the metallic layer space apart the first part and the second part such that they can be inserted into the outer housing. In this case, the joining surfaces can form different, even uneven, surfaces which correspond to one another in such a way that they can be pushed apart (eg also in the sense of positive locking - positive connections are created by the intermeshing of at least two connecting partners, so that the connecting partners also do not release with or without interrupted power transmission.). However, it should be noted that a thickness of a metallic layer is subtracted from the joining surfaces or from one of the joining surfaces. By arranging the metallic layer between the first part and the second part of the particle is already brought into its final shape. It should be noted that the arrangement of the metallic layer between the first part and the second part can also be carried out after the sliding and / or joining of the outer housing with one of the parts. By jamming the metallic layer this is firmly locked. In particular, the metallic layer is sufficiently secured in order to sufficiently withstand the forces due to the pulsating exhaust gas and possibly entrained particles. It should be noted, however, that the strength of the metallic layer can only be generated by additional holding means. Such holding means may, for. As welds, welds, solder points, solder joints, adhesives or rivets and the like. Again, it should be noted that the jamming of the metallic layer can be made only after pushing and / or joining the outer housing with one of the parts.

When sliding the outer housing over the first outer circumference and the second outer circumference, both the outer housing can be pushed over the first and second parts (in any order) and (for example sequentially) the first and second parts (in any order) in the outer casing. The first part and the second part can be inserted both successively and simultaneously in the outer housing. In this case, the metallic layer can already be arranged there or can be arranged only during the sequential pushing between the first part and the second.

For joining the outer housing to the first part and / or the second part, different joining methods can be used. The parts can be clamped conically, be pushed with clearance fit against a stop, shrunk, are materially connected to each other, screwed or clicked. Preferably, the outer housing is joined to the parts by resistance welding points from the outside. These welds can also be used only as a backup to one of the aforementioned joining methods. The region of the first joining surface and the second joining surface is arranged so that an influence of the joining process by deformation, thermal distortion or contact with other components with the metallic layer is avoided. In particular, the area chosen so far that the metallic layer can be arranged without deformation in the outer housing.

According to a development of the method, the metallic layer is guided by a distance of the outer housing to the first part and the second part in the area in a predetermined position. Advantageously, the metallic layer projects beyond the outer circumference of the first part and the second part and does not have to be exactly positioned when provisionally arranged between the first part and the second part. By pushing the outer housing and the distance of the outer housing in the region of the first joining surface and the second joining surface, the metallic layer is radially positioned or aligned. The distance can also be chosen so that no contact between the metallic layer and the outer casing can take place. As a result, an influence z. B. prevented by deformation of the outer housing. In that case, the guiding to a predetermined position by the distance of the housing from the first part and the second part is to be understood so that the assembler is assisted by a (uniform) cavity between the edge of the metallic layer and the outer housing in the exact positioning becomes.

In an advantageous embodiment of the method according to the invention, the first part and the second part are manufactured from one piece by cutting. In order to obtain a first part and a second part with a first joining surface and an exactly corresponding second joining surface in a simple, quick and cost-effective manner, the first part and the second part can first be made in one piece. As a separation process, one of the following may be considered in particular: sawing; milling; thermal and mechanical separation processes; Laser separation. Such separation methods are preferably used which do not require any further post-processing, in particular laser cutting.

According to a further aspect of the invention, a method for producing a particle separator, which is one of exhaust gas flow-through metallic layer, a first part of a housing having a first joining surface and a second part of a housing having a second joining surface, which comprises at least the following steps:

Providing a housing;

- dividing the housing into a first part and a second part, so that a non-rectilinear first joining surface and a corresponding second joining surface are formed,

Arranging the at least one metallic layer between the first joining surface and the second joining surface;

- Fixing of first joining surface and second joining surface to each other, so that the metallic layer is held therebetween.

This process relates in particular to the production of a variant of the particle separator described here according to the invention. Irrespective of this, it is also possible to refer to the other explanations in connection with the particle separator and / or the above method for explaining the method steps. For dividing the housing, laser cutting is preferred, especially with regard to the complex course of the joining surfaces for forming the corrugation of the metallic layer. The fixing of the metallic layer between the housing parts can in turn be made cohesively (by brazing, welding, etc.).

In the context of the invention, a motor vehicle having an arrangement for treating exhaust gases of an internal combustion engine with at least one exhaust pipe comprising an exhaust gas recirculation system is also described, wherein an inventive particle separator is provided in the exhaust gas recirculation system. In an internal combustion engine and the exhaust system moving parts are provided. In particular, the cylinder and piston of the internal combustion engine and the compressor blades of a turbocompressor rely on the fact that they cause a good seal despite high thermal stress. Sharp-edged ceramic parts can severely damage turbo-compressor blades and piston seals. In this case, it is now proposed in particular to arrange the particle separator according to the invention behind a ceramic honeycomb body and / or a ceramic-coated honeycomb body, above all in (ie including "directly on") the exhaust gas recirculation line upstream of a turbocompressor In addition, due to its adaptable structural expansion and flexibility, the particle separator can be used very flexibly, above all in areas of the exhaust pipe, which until now have remained unused for constructional reasons.

The invention and the technical environment will be explained in more detail with reference to FIGS. The figures show particularly preferred embodiments, to which the invention is not limited. The figures are schematic table and designate the same components with the same reference numerals. Show it:

Fig. 1: a particle with clamped metallic layer and

Outer casing;

Fig. 2: a particle with inclined arranged metallic

Location;

3 shows a particle separator with non-flat joining surfaces;

Fig. 4: a particle separator before the jamming of the metallic

Position between the first joining surface and the second joining surface; Fig. 5: a metallic layer with two layers;

6 shows a plan view of a particle separator; and

Fig. 7: a motor vehicle with a particle separator in the exhaust system. 1 shows a particle separator 1 in the assembled state, in which the metallic layer 3 is arranged between a first part 8 with the first joining face 10 and a second part 9 with the second joining face 11. The first part 8 and the second part 9 thus form the (multi-part) housing 4. The housing 4 is located in the outer housing 13. The inlet opening 5 and the outlet opening 6 define the center axis 7. Here, the particle separator 1 may have any desired shape. In the region of the first joining surface 10 and the second joining surface 11 in the region 17, the outer casing 13 is arranged at a distance of 12 by the distance 12 such that the machined edge 14 of the metallic layer 3 just touches the outer casing 13. This z. B. in the contact points 23 material connections between the outer housing 13 and the first part 8, second part 9 and / or the metallic see layer 3 on the machined edge 14 may be provided.

FIG. 2 shows a round particle separator 1, in which the obliquely arranged metallic layer 3 can be seen through the inlet opening 5. The oblique arrangement of the metallic layer 3 in the housing 4 is predetermined by the first joining surface 10 of the first part 8 and the second joining surface 11 of the second part 9. Here, the metallic layer 3 is shown so that it does not protrude beyond the first outer periphery 15 of the first part 8 and the second outer periphery 16 of the second part 9. In FIG. 3, the particle separator 1 is shown in a side view, wherein in turn the center axis 7 is defined by the inlet opening 5 and the outlet opening 6 of the housing 4. In this embodiment, the metallic layer 3 is bent between the joining surface 10 of the first part 8 and joining surface 11 of the second part 9.

Fig. 4 shows the first housing part 8 with the joining surface 10 and the second part 9 with the second joining surface 11 and a metallic layer 3 with machined edge 14 before assembling or arranging. It is shown that the metallic layer 3 may initially be flat and only by the arrangement between the first joining surface 10 and the second Joining surface 11 in the predetermined position 18 and then in the desired shape, as z. B. in Fig. 3, is brought.

5 shows a multilayered version of a metallic layer 3, wherein a first layer 31 and a second layer 32 are arranged in direct, planar contact with each other (here partly as an exploded view). The first flowed-first layer 31 has a width 29 of the openings 28, which is many times smaller than the width 29 of the openings 28 in the subsequent second layer 32. Thus (only) the first layer takes over the function of particle deposition, while the second layer 32 (alone) for (rear) support or partial support of the first layer 31 is used. In any case, the metallic layer 3 (or in this case the first layer 31) has an opening 28 with a width 29 which lies in a range of 0.05 to 0.25 mm.

In Fig. 6, a particle separator 1 is shown in plan view, wherein the metallic layer 3 is shown for simplicity with a structure that does not correspond to the curl optically. It is also possible that the inlet opening and the outlet opening 6 have different shapes to one another and / or different shapes to the other cross-section 30 of the housing 4.

FIG. 7 shows a motor vehicle 19 which has an internal combustion engine 2, a particle separator 1, a turbocharger 26 and optionally an exhaust gas purification unit 24. The exhaust system 20 consists of an exhaust pipe 21 and an exhaust gas recirculation line 22. The displacement of the internal combustion engine 2 is supplied from the left side with charged exhaust gas and on the other side exhaust gas flows in the flow direction 27 again. By the particle separator 1 in the exhaust gas recirculation line 22, the turbocompressor of the turbocharger 26 is protected from any larger particles in the exhaust system 20. These particles can originate, for example, from a (partially) ceramic exhaust gas purification unit 24, which has previously passed through the exhaust gas. Thus, the particle separator 1 protects all subsequent (downstream) downwardly arranged) components in front of larger particles from the internal combustion engine 2, upstream of the particle separator 1 lying portions of the exhaust pipe 21. Such components are in particular the turbocharger 26 and / or other exhaust gas cleaning units and / or the cooler 25 (or heat exchanger), in particular the exhaust gas recirculation line 22. Thus, the internal combustion engine 2 and their displacements are protected from damage by larger particles. FIG. 7 shows any technically sensible arrangement of the particle separators 1 and does not represent a limitation of the exact arrangement of the particle separator 1.

Thus, the invention at least partially solves the technical problems described in connection with the prior art.

LIST OF REFERENCE NUMBERS

1 particle separator

2 internal combustion engine

3 metallic layer

4 housing

5 inlet opening

6 outlet opening

7 center axis

8 first part

9 second part

10 first joining surface

11 second joining surface

12 distance

13 outer casing

14 worked edge

15 first outer circumference

16 second outer circumference

17 area

18 predetermined position

19 motor vehicle

20 exhaust system

21 exhaust pipe

22 exhaust gas recirculation line

23 contact point

24 exhaust gas cleaning unit

25 coolers

26 turbochargers

27 flow direction

28 opening

29 width

30 cross section

31 first shift

32 second layer

Claims

claims

Particle separator (1) for treating exhaust gases of an internal combustion engine (2), wherein at least one metallic layer (3) through which exhaust gas can flow is arranged in a housing (4) with an inlet opening (5), an outlet opening (6) and a center axis (7) wherein the housing (4) has a first part (8) with a first joining surface (10) and a second part (9) with a second joining surface (11), wherein the first joining surface (10) and the second joining surface ( 11) correspond to each other, and the at least one metallic layer (3) the first joining surface (10) and the second joining surface (11) fully spaced.

Particle separator (1) according to claim 1, wherein the first joining surface (10) and the second joining surface (11) are not in a flat plane.

Particle separator (1) according to claim 1 or 2, wherein the at least one metallic layer (3) by means of the first part (8) and the second part (9) by an outer housing (13) are clamped together.

Particle separator (1) according to one of the preceding claims, wherein the outer housing (13) in the region (17) of the mutually positioned corresponding first joining surface (10) and second joining surface (11) of the housing (4) has a spacing (12).

Particle separator (1) according to one of the preceding claims, wherein the at least one metallic layer (3) has a machined edge (14) which is arranged at least partially outside the housing (4).

6. Particle separator (1) according to one of the preceding claims, wherein the at least one metallic layer (3), the outer housing (13) at least partially contacted.

Method for producing a particle separator (1), comprising an outer housing (13), a metallic layer (3) through which exhaust gas can flow, a first part (8) of a housing (4) having a first joining surface (10) and having a first outer circumference ( 15), and a second part (9) of a housing (4) with a second joining surface (11) and with a second outer periphery (16), comprising at least the following steps:

- arranging the metallic layer (3) between the first part (8) and the second part (9);

- Clamping the metallic layer (3) by merging the first part (8) and the second part (9);

- Sliding the outer housing (13) over the first outer periphery (15) of the first part (8) and the second outer periphery (16) of the second part (9); and

- Joining the outer housing (13) with the first part (8) and the second part (9) outside a region (17) of the first joining surface (10) and second joining surface (11).

Method according to claim 7, wherein the first part (8) and the second part (9) are manufactured in one piece by cutting.

Method for producing a particle separator (1), comprising a metallic layer (3) through which exhaust gas can flow, a first part (8) of a housing (4) having a first joining surface (10) and a second part (9) of a housing (4) with a second joining surface (11), which comprises at least the following steps:

- Providing a housing (4);

- dividing the housing into a first part (8) and a second part (9) so that a non-rectilinear first joining surface (10) and a corresponding second joining surface (11) are formed, - arranging the at least one metallic layer (3) between the first joining surface (10) and the second joining surface (11);

- Fixing of first joining surface (10) and second joining surface (11) to each other, so that the metallic layer (3) is held therebetween.

Motor vehicle (19) comprising an exhaust system (20) for treating exhaust gases of an internal combustion engine (2) with at least one exhaust pipe (21), comprising an exhaust gas recirculation line (22), wherein a particle separator (1) according to one of the preceding claims in the exhaust gas recirculation line (22 ) is provided.