DE10216272B9 - Exhaust treatment arrangement for an internal combustion engine - Google Patents

Abstract

Exhaust gas treatment arrangement for an internal combustion engine (3) with at least one exhaust gas discharge opening (9), comprising:
at least one exhaust-gas catalytic converter (29), which comprises at least one cylindrical catalyst carrier body (42),
at least one catalyst holder tube (27) which has a first tube region (31) in which the at least one catalyst carrier body (42) is accommodated and a second tube region (39) adjoining the first tube region (31) for discharging into the catalyst carrier body ( 42) treated exhaust gas, wherein an inner diameter (D1) of the first pipe portion (31) is greater than an inner diameter (D2) of the second pipe portion (39), and
at least one flange (17) immediately adjacent to the first tube region (31),
characterized in that
the at least one flange (17) is provided for direct coupling to the at least one exhaust emission opening (9) of the internal combustion engine (3), and wherein the first pipe region (31) and the second pipe region (39) of the at least one catalyst holder pipe (27) consist of a single piece of pipe are integrally formed.

Description

The The present invention relates to an exhaust treatment arrangement with at least one exhaust gas catalyst for the treatment of exhaust gases of an internal combustion engine with at least one exhaust port.

to Reduction of pollutants in exhaust gases from internal combustion engines be catalytic converters in the exhaust system of the internal combustion engine arranged. The exhaust gas system comprises at least one group of a plurality of directly coupled to the exhaust gas discharge openings in particular as exhaust manifold designated pipe sections, which from the exhaust emission openings emitted exhaust gases take up. To these pieces of pipe are pipe junctions coupled to the exhaust gases from the multiple exhaust exhaust ports a group of exhaust vents to collect in a single tube to which a silencer connected is, from which the exhaust finally discharged to the environment becomes. This goes through before entering the muffler Exhaust gas an exhaust gas catalyst, in which contained in the exhaust gas pollutants, such as carbon monoxide and nitrogen oxides in less harmful products being transformed. In motor vehicles, the catalytic converter usually together with the silencer on Vehicle floor of the motor vehicle arranged.

to efficient treatment of the exhaust gas, the catalytic converter must have a increased Operating temperature of e.g. above 600 ° C have. When cold starting the engine is a certain amount of time necessary until the catalytic converter reaches its intended operating temperature achieved while which time then optimal treatment of the exhaust gases is not possible and increased accordingly Pollutant levels are released to the environment. This period of time is at a arranged on the vehicle floor exhaust catalyst under other reason comparatively long, since the catalytic converter with a relatively large one Distance from the internal combustion engine is arranged and the exhaust gases upon entering the catalytic converter due to heat exchange provided with the between internal combustion engine and catalytic converter Pipe connections compared to the exit directly from the internal combustion engine strongly cooled are.

Therefore catalytic converters were developed, which are closer to the internal combustion engine, for example in the exhaust manifold, are arranged and which after a cold start correspondingly faster their reach intended operating temperature, which itself be even higher can be considered comparable to that of catalytic converters in the field of the vehicle floor are arranged.

State of the art

Such an exhaust catalyst disposed near the exhaust port of the engine is off US 60 62 020 A known. This catalytic converter has a catalyst carrier body of frusto-conical shape, which is inserted into a conically tapered exhaust pipe. The catalyst carrier body is supported by a fiber mat opposite the conically tapered tube. The fiber mat has a certain elasticity, which protects the sensitive catalyst carrier body from the strong vibrations occurring close to the internal combustion engine.

This Mounting concept for becomes the catalyst carrier body However, felt to be disadvantageous because of proper retention of the Catalyst carrier body of this with a relatively precise axial pressure to be set in the conically tapered Pipe section pressed must become. Further includes this support concept the use of cylindrical catalyst carrier bodies, which in view of a flow through the same advantageous would.

task

Accordingly, a Object of the present invention to propose an exhaust treatment arrangement, with which in particular cylindrical catalyst carrier body close can be arranged on the internal combustion engine.

Under In a first aspect, the invention is based on an exhaust gas treatment arrangement for one Internal combustion engine with at least one exhaust emission opening, wherein a plurality of catalytic converters are provided, and wherein a each catalytic converter of a separate exhaust port of the internal combustion engine assigned. The exhaust gas catalyst comprises a catalyst carrier body, which a surface provides on which the catalyst material is provided which is the chemical reaction to transform the harmful ones Promotes combustion products into less harmful products. Especially sets the catalyst carrier body in its interior a variety of flow channels ready to use the inner surface the catalyst material are provided. The flow channels are preferably channels from along their length essentially uniform Cross-section to a flow the catalytic converter with as possible low flow losses to enable. Corresponding the catalyst carrier body has an im substantially cylindrical shape, wherein the cylindrical shape not necessarily the shape of a circular cylinder must have. Much more Cylindrical shapes are provided with any desired surface, such as hexagonal or square base.

Of the Catalyst carrier body is received in a catalyst holder tube, which indirectly to the Exhaust port of the Internal combustion engine is coupled. Preferably, the catalyst holder is ear however directly, i. without the insertion of further separate pipe sections coupled to the exhaust port.

The Invention is characterized in that the catalyst holder tube having two pipe regions in succession, wherein the catalyst carrier body, seen in the flow direction of the exhaust gas, is received in a front first pipe section, which has a larger inner diameter has as a the second tube region in the flow direction of the exhaust gas subsequent second Pipe area.

This Interpretation is the consideration based on that of the total cross section of the catalyst carrier body only a part as Flow area for the Exhaust gas available stands. With a view to reducing the flow losses in the catalyst carrier body its cross section compared to the cross section of the second pipe section elevated.

Especially is provided here that the Cross section of the catalytic converter carrier body is equal to or greater as the inner diameter of the second pipe section.

in the With regard to a simple production of the catalyst holder tube this preferably integrally formed from a single piece of pipe. This means, that the first and the second pipe portion not provided by separate pipe pieces are, which by joining techniques, such as welding or Screw together are.

Under In a second aspect, the invention provides an engine-near Arrangement of exhaust gas catalysts before, wherein each exhaust gas catalyst several exhaust emission openings the internal combustion engine is assigned, although not one single catalytic converter all Exhaust gas discharge ports assigned. Accordingly, a plurality of catalytic converters are provided, each one housed in a separate catalyst holder tube is. Accordingly, in the flow direction before the exhaust catalyst, a branch pipe provided to a each catalyst holder tube with multiple exhaust ejection ports to pair. Furthermore, in an exhaust gas flow direction behind the plurality Catalytic converters provided a pipe junction to the multiple Catalyst holder tubes merge into a single secondary exhaust pipe.

Preferably is as a transition between the first and the second pipe section, a third pipe section inserted, its inner diameter is smaller than that of the first pipe section and bigger than that of the second pipe section. This third pipe section presents preferably a radial shoulder, on which the catalyst carrier body itself or with interposition another support structure is axially supported, so that it against slipping in the exhaust gas flow direction is fixed to the second tube area.

in the Difference to the example on the vehicle floor just before the silencer arranged exhaust gas catalyst is in question here near engine Catalytic converter special mechanical and thermal loads and in particular increased flow pulsations exposed. Such an engine-near catalytic converter is preferably less than 1 m, in particular less than 0.5 m and in particular less than 0.25 m from the internal combustion engine arranged, with this length not to a geometric distance between the catalyst carrier body and the internal combustion engine refers, but to a length of Pipe connection between the catalyst carrier body and Abgasausstoßöffnung the Internal combustion engine.

Preferably is the catalyst carrier body through inserted through the pipe flange in the catalyst holder tube, and Although more preferably such that the catalyst carrier body with his entire length is received in the first tube area.

Of the Catalyst carrier body can for example, by a ceramic structure, a metallic Structure or another structure may be formed, which, however due to the large number of catalyst surfaces in view of Flow channels mechanically fragile and sensitive Deformations and fractures is. Therefore, it is preferable that the catalyst carrier body itself not directly adjacent to the catalyst holder tube, but rather arranged at a distance from an inner shell of the first pipe portion is. Accordingly, between the catalyst carrier body and the inner shell of the first pipe portion holding structures for mounting the catalyst carrier body provided, to fix it sufficiently mechanically in the first tube area and at the same time a transmission from shaking from the catalyst holder tube to the catalyst carrier body dampen.

Such support structures are preferably provided, as viewed in the flow direction of the exhaust gas, at a front end region and a rear end region of the catalyst carrier body. Preferably, axial regions are provided on the catalyst carrier body between the front and rear end regions, which are not supported by interposed structures on the catalyst holder tube, so that heat transfer from the catalyst carrier body to the catalyst holder tube is also reduced at these regions, with a view to faster achievement the operating temperature of the catalyst is advantageous. It is then only at the front and rear end region direct thermal bridges between the catalyst carrier body and the catalyst holder tube formed by the support structures.

A such carrier structure is preferably formed by a spacer sleeve, which in particular is formed closed in the circumferential direction to a flow around the Catalytic converter to block by the exhaust gases.

in the With regard to damping of transferred to the catalyst carrier body Vibrations, the spacer sleeve a spring action on by being in an area both in Axial and extends in the radial direction.

The Stand Off is preferably frictionally engaged on the inner shell of the first pipe portion. Alternatively or in addition to this However, a circumferential groove on the inner shell of the first pipe portion be provided, in which the spacer sleeve engages in particular, when the exhaust gas catalyst is introduced into the first pipe section. Alternative or supplementary this is also provided, the spacer sleeve with the inner shell of the welded or soldered to the first pipe section or in another way connect to.

alternative or in addition can also be a holding structure by a between the catalyst carrier body and be formed cuff inserted in the inner shell of the first pipe region, which as a braid or knitted fabric or fleece or fabric or Felt is made of wire or another material.

Especially preferred here is a holder in which the support structure the front end portion by a spacer sleeve and the support structure on rear end portion of the catalyst carrier body through a wire mesh sleeve is formed. This facilitates the insertion of the catalyst carrier body in the first pipe portion, preferably close to the pipe flange Spacer sleeve with can be welded to the catalyst holder tube.

Further is provided that radially between an area supported in the first pipe area the spacer sleeve and the catalyst carrier body a Cuff is inserted of such kind as before as inserted directly between the first pipe portion and the catalyst carrier body sleeve has been described.

embodiment

following Become embodiments of the Invention explained in more detail with reference to drawings. Hereby shows:

1 a schematic representation of a first embodiment of an exhaust treatment system according to the invention,

2 a detailed view in axial longitudinal section of 1 shown exhaust treatment arrangement,

3 to 7 each detail by type of 2 of further embodiments of the exhaust gas treatment arrangement according to the invention,

8th a schematic representation of yet another embodiment of the exhaust treatment system,

9 Yet another embodiment of the exhaust treatment system and

10 a detailed view of in 9 shown exhaust treatment arrangement.

In 1 is an exhaust treatment arrangement 1 shown schematically. This is used to treat exhaust gases of a four-cylinder four-stroke internal combustion engine 3 with a cylinder head 5 , The cylinders of the internal combustion engine 3 Fresh air is supplied to the cylinder head via the intake manifold, and the exhaust gas produced during combustion in the cylinders is exhausted from the cylinder head 5 provided Abgasausstoßöffnungen 9 pushed out.

The through the exhaust emission openings 9 output combustion gases are from an exhaust system 11 containing the exhaust treatment arrangement 1 includes, over an exhaust end 13 delivered to the environment. The exhaust system 11 includes four exhaust manifolds 15 , each with a pipe flange 17 with an exhaust port 9 are bolted. The four exhaust manifolds 15 are at their the pipe flanges 17 opposite ends via a pipe junction 19 connected to each other, the exhaust gases discharged from the four cylinders in a manifold 21 to summarize, which via a flange connection 23 with the pipe junction 19 is screwed. The exhaust manifold 21 guides the exhaust gases through a silencer 25 the exhaust end 13 to.

To the pipe flanges 17 subsequent pipe sections of the exhaust manifold pipes 15 are as catalyst holder tubes 27 formed, each of which in its interior an exhaust gas catalyst 29 receives. The combustion exhaust gases pass through the catalytic converters, which convert harmful combustion products contained in the exhaust gases into less harmful products. In particular, nitrogen oxides are reduced to nitrogen, carbon monoxide is oxidized to carbon dioxide, and hydrocarbons are oxidized to carbon dioxide and water.

In 2 is the arrangement of the catalyst 29 in the catalyst holder tube 27 shown in detail. The catalyst holder ear 27 has one with the flange 17 provided first pipe area 31 on, with the flange 17 with the interposition of a seal 33 with screws 35 firmly with the cylinder head 5 connected is. Within the first pipe area 31 is the catalytic converter 29 added. In an exhaust gas flow direction 37 behind the first pipe area 31 the catalyst holder tube goes 27 in a second tube area 39 over which the exhaust gases after flowing through the catalytic converter 29 to the pipe junction 19 leads. The first pipe area 31 has a larger inner diameter D1 than the second tube portion 39 which has an inner diameter D2. The catalyst holder ear 27 is with its two pipe sections 31 . 39 formed integrally, wherein between the two pipe sections 31 . 39 a pipe rejuvenation 41 is intended as a transition.

The catalytic converter 29 comprises a catalyst carrier body designed as a honeycomb body 42 , which in its interior a plurality of schematically illustrated flow channels 43 whose surfaces are coated with catalyst material such as platinum and palladium. The flow channels 43 have along their length substantially the same cross section, so that the entire catalyst carrier body 42 has a cylindrical shape whose cross section in the in 2 described embodiment is circular. The catalyst carrier body 42 has on its outer periphery an outer sheath 45 on. The catalyst carrier body 42 is formed of a ceramic material, and the outer sheath 45 is provided on its outer surface with a metal layer, which with a metal spacer sleeve 47 joining technically firmly connected. The spacer sleeve 47 holds the catalyst 29 within the first pipe section 31 such that the outer jacket 45 at a distance A from the catalyst holder tube 27 is arranged. The spacer sleeve 47 has in cross section the shape of an elongated S, wherein a on the outer shell 45 the catalyst carrier body 42 fixed area 49 and one on the inner wall of the first pipe portion 31 adjoining area 51 the spacer sleeve 47 parallel to an axis 53 of the cylindrical catalyst carrier body 42 extend. Between the areas 49 and 51 extends a middle range 55 the spacer sleeve 47 starting from the area 49 towards the flange 17 radially outward. The on the inner shell of the first pipe section 31 adjacent area 51 the spacer sleeve 47 is with the catalyst holder ear 27 welded, with a weld 57 in 2 symbolically indicated.

At one of the flange 17 opposite end of the catalyst carrier body 42 is between its outer shell 45 and the inner wall of the first pipe section 31 a wire mesh cuff 59 which contains the catalyst carrier body 42 supported radially opposite the catalyst holder tube.

For mounting the catalytic converter 29 in the catalyst holder tube 27 First, the cuff 59 tight over one end of the catalyst carrier body 42 slipped, then the catalyst carrier body is first with the cuff 59 in the opening of the first pipe section 31 introduced and pushed so far that the catalyst carrier body 42 completely in the first tube area 31 is received and a distance B between an end face of the catalyst carrier body 42 and the pipe flange 17 is about 5 mm. Then the weld 57 between the catalyst holder tube 27 and the area 51 the spacer sleeve 47 either over the full circumference or only on a partial circumference, for example by spot welding. Thus, the catalyst carrier body 42 through the spacer sleeve 47 in the exhaust gas flow direction 37 fixed in the catalyst holder tube and through both the sleeve and the sleeve 59 in the radial direction relative to the catalyst holder tube 27 supported.

Below are variants of the basis of the 1 and 2 illustrated embodiment illustrated. Here, components that are components of the structure and function of the 1 and 2 correspond with the same reference numerals as in the 1 and 2 but with an additional letter to distinguish them. Here, reference is made to the entire preceding description.

An in 3 in the axial longitudinal section shown exhaust gas catalyst 29a has a similar structure, as in the 1 and 2 explained catalytic converter. In contrast, a catalyst carrier body 42a however, both at its front and its rear end by a spacer sleeve 47a in a first pipe area 31a a catalyst holder tube 27a supported. The two spacers 47a each have an S-shaped configuration, both starting from one on an outer shell 45a a catalyst carrier body 42a fixed area 49a over an intermediate area 55a radially outward and towards a pipe flange 17a extend and with an end area 51a frictionally engaged on an inner wall of the first pipe portion 31a issue.

The catalyst holder tube is in turn formed in one piece, wherein the first tube region 31a an inner diameter D1 which is substantially larger than an inner diameter D2 of the first pipe portion 31a subsequent pipe area 39a for removing the exhaust gases. Here is the first pipe area 31a opposite the second pipe section 39a extended so that the in the first tube area 31a absorbed catalyst carrier body 42a a cross-sectional diameter D3 larger than the inner diameter D2 of the second pipe portion 39a ,

An in 4 illustrated embodiment of the exhaust treatment arrangement is similar to that in 2 shown arrangement. In contrast, one of a pipe flange 17b opposite end of a catalyst carrier body 42b not by a wire mesh sleeve against a catalyst holder tube 27b supported, but by a further spacer sleeve made of sheet metal 47b which one on the catalyst carrier body 42b fixed area 49b , a radially outward and away from the pipe flange 17b extending middle range 55b and one at a first pipe portion 31b of the catalyst holder tube 27b frictionally fitting area 51b having. To insert the sleeve 47b and thus the catalyst carrier body 42b in the first pipe area 31b through an opening in the flange 17b To facilitate, the spacer sleeve extends 47b over the on the catalyst tube 27b adjacent area 51b out with an end area 65 again radially inward.

An in 5 shown embodiment of the exhaust treatment device has a similar structure, as in 3 shown exhaust treatment arrangement. A catalyst carrier body 42c is in turn at its two axial ends by spacers made of sheet metal 47c opposite a catalyst holder tube 27c supported. However, this is a pipe flange 17c of the catalyst holder tube 27c facing spacer sleeve 47c with one on an inner wall of a first pipe portion 31c of the catalyst holder tube 27c adjacent area 51c with the catalyst holder tube 27c through a weld 57c firmly connected. The other spacer sleeve 47c lies with an area 51c on an inner wall of the first pipe section 31c frictionally engaged. Between the area 51c this spacer sleeve 47c and an outer jacket 45c a catalyst carrier body 42c is a wire mesh cuff 59c inserted, which is intended to vibrations of the catalyst carrier body 42c within the catalyst holder tube 27c to dampen.

An in 6 shown further embodiment of the exhaust treatment device has a similar structure, as based on the 5 explained exhaust treatment arrangement. In contrast, however, is a pipe flange 17d facing spacer sleeve made of metal 47d for supporting a catalyst carrier body 42d not with a catalyst holder tube 27d welded, but only frictionally inserted in this. For further vibration damping is in both spacers 47d between at a first pipe area 31d of the catalyst holder tube 27d adjacent areas 51d the spacer sleeves 47d and an outer jacket 45d the catalyst carrier body 42d a metal mesh cuff 59d inserted.

Furthermore, the first pipe area goes 31d with an inner diameter D1 not directly into a second tube area 39d with an inside diameter D2 over. Rather, between the two pipe sections 31d . 39d a third pipe area 67 provided with an inner diameter D4, which is smaller than the inner diameter D1 and larger than the inner diameter D2. At a rejuvenation or radial shoulder 69 between the first pipe section 31d and the third pipe section 67 a stop shoulder is formed, at which the of the pipe flange 17d remote spacer sleeve 47d comes to rest, to slipping of the catalyst carrier body 42 into the catalyst holder tube 27d to prevent it.

An in 7 shown embodiment of the exhaust treatment device has a similar structure, as based on the 6 explained embodiment. In contrast to this, a first tube region has 31e a catalyst holder tube 27e a circumferential groove 71 on, in which a spacer sleeve made of sheet metal 47e for supporting a catalyst carrier body 42e opposite the first pipe section 31e with an area 51e is engaged to the catalyst carrier body 42e both toward the catalyst holder tube 27e to set it axially as well as in the opposite direction.

An in 8th illustrated exhaust treatment arrangement 1f has a similar structure, as based on the 1 and 2 explained exhaust treatment arrangement. In contrast, however, is a front end face of catalyst carrier bodies 42f not substantially directly to exhaust ports 9f arranged. Rather, these faces of the Abgasausstoßöff a distance B of about 20 cm.

An in 9 schematically illustrated exhaust treatment arrangement 1g has a structure similar to that in 8th similar exhaust gas treatment arrangement shown. Again, front faces of catalytic converters 29g with an increased distance B of about 30 cm from exhaust exhaust ports 9g a cylinder head 5g arranged. However, each is a catalytic converter 29g not separate from a single exhaust port 9g assigned. Rather, each is a catalytic converter 29g a group of two exhaust emission openings 9g assigned. Here, between a first pipe portion of a catalyst holder ear 27g in which the catalytic converter 29g is included, and pipe flanges 17g , which with the exhaust emission openings 9g are bolted, a branch pipe 75 arranged to exhaust the exhaust from two exhaust ports 9g an exhaust gas catalyst 29g supply.

To the first pipe sections 31g in which the catalytic converters 29g are included, close second pipe sections 39g the catalyst holder tubes 27g which in another pipe junction 19g lead to the exhaust gases of all four cylinders of the engine 5g to a common manifold 21g merge.

As in 10 is shown, are the first pipe area 31g and the second pipe section 39g again made from a single piece of pipe. The pipe branch 75 is with the first pipe area 31g with a weld 77 welded, which was made after the catalyst carrier body 42g was inserted in the first pipe section.

In In the above-described embodiments, the catalyst carrier body is a ceramic catalyst carrier body, which on his outer coat metallized to it a metal sleeve for supporting the Catalyst carrier body in the Metallurgically attach catalyst holder tube. It However, it is also provided, the catalyst carrier body is not made of a ceramic material to manufacture, but from a metal material, in which case the attachment the metal sleeve is simplified.

In The embodiments described above was also a Wire braid used to vibration damping the catalyst carrier body against the Support catalyst holder tube. By contrast, this function is not on a wire mesh cuff limited. Rather, you can other cuffs are provided, such as knitted fabrics or woven from wires, bands etc., which also need not necessarily be made of metal and such as mineral fibers or the like may include.

In The embodiments described above are each in in each case a single one of the first region of the catalyst holder tube Catalyst carrier body arranged. However, it is also possible to arrange in the first tube region a plurality of catalyst carrier body, in particular axially one behind the other.

Claims (26)

Exhaust treatment arrangement for an internal combustion engine ( 3 ) with at least one exhaust gas discharge opening ( 9 ), comprising: at least one engine-related exhaust gas catalytic converter ( 29 ), which comprises at least one cylindrical catalyst carrier body ( 42 ), at least one catalyst holder tube ( 27 ), which has a first tube area ( 31 ), in which the at least one catalyst carrier body ( 42 ) and one to the first pipe area ( 31 ) adjoining second tube region ( 39 ) for discharging in the catalyst carrier body ( 42 ) treated exhaust gas, wherein an inner diameter (D1) of the first pipe region ( 31 ) is greater than an inner diameter (D2) of the second tube region ( 39 ), and at least one directly to the first pipe region ( 31 ) adjacent flange ( 17 ), characterized in that the at least one flange ( 17 ) for direct coupling to the at least one exhaust gas ejection opening ( 9 ) of the internal combustion engine ( 3 ), and wherein the first pipe region ( 31 ) and the second pipe section ( 39 ) of the at least one catalyst holder tube ( 27 ) are integrally formed from a single piece of pipe. Exhaust treatment arrangement according to claim 1, wherein between the first pipe region ( 31 ) and the second tube region ( 39 ) a third tube region ( 67 ) with a radial shoulder ( 69 ), wherein an inner diameter (D4) of the third pipe region ( 67 ) is smaller than an inner diameter (D1) of the first pipe region ( 31 ) and larger than an inner diameter (D2) of the second tube region ( 39 ), and where the radial shoulder ( 69 ) is provided to the catalyst carrier body ( 42 ) in an exhaust gas flow direction ( 37 ) to fix. Exhaust treatment arrangement according to claim 2, wherein the first pipe region ( 31 ), the second pipe section ( 39 ) and the third pipe area ( 67 ) of the at least one catalyst holder tube ( 27 ) are integrally formed from a single piece of pipe. Exhaust treatment arrangement according to one of Claims 1 to 3, wherein the at least one catalyst carrier body ( 42 ) one the at least one flange ( 17 ) facing the axially front end portion and one of the at least one flange ( 17 ) facing away from the axially rear end portion and at least at the front and rear end portions radially opposite the first pipe portion ( 31 ) is supported. Exhaust gas treatment arrangement according to claim 4, wherein in the front and / or rear end region a cuff formed as a braid and / or knitted fabric and / or tissue ( 59 in particular wire between the at least one catalyst carrier body ( 42 ) and the inner shell of the first pipe region ( 31 ) is inserted. Exhaust treatment arrangement according to one of claims 1 to 5, further comprising at least one spacer sleeve ( 47 ), on the one hand on the catalyst carrier body ( 42 ) and, on the other hand, opposite the first tube region ( 31 ) is radially supported. Exhaust treatment arrangement according to claim 6, wherein, as seen in Axiallängsschnitt, the spacer sleeve ( 47 ) starting from one on the catalyst carrier body ( 42 ) ( 49 ) in the exhaust gas flow direction ( 37 ) and radially outward to one at the first pipe region ( 31 ) supporting area ( 51 ). Exhaust treatment arrangement according to claim 6 or 7 in conjunction with claim 5, wherein the at least one catalyst carrier body ( 42 ) at the front end region through the spacer sleeve ( 47 ) and at its rear end by the cuff ( 59 ) is supported against the first pipe region. Exhaust treatment arrangement according to claim 6 or 7 in conjunction with claim 5, wherein the sleeve ( 59c ) radially between one on the first pipe region ( 31c ) supporting area ( 51c ) of the spacer sleeve ( 47c ) and the at least one catalyst carrier body ( 42c ) is inserted. Exhaust treatment arrangement for an internal combustion engine ( 3 ) with at least one exhaust gas discharge opening ( 9 ), comprising: at least one engine-related exhaust gas catalytic converter ( 29 ), which comprises at least one cylindrical catalyst carrier body ( 42 ), at least one catalyst holder tube ( 27 ), which has a first tube area ( 31 ), in which the at least one catalyst carrier body ( 42 ) and one to the first pipe area ( 31 ) adjoining second tube region ( 39 ) for discharging in the catalyst carrier body ( 42 ) treated exhaust gas, and at least one spacer sleeve ( 47 ), which on the one hand on the catalyst carrier body ( 42 ) and, on the other hand, opposite the first tube region ( 31 ) is radially supported, wherein the spacer sleeve ( 47 ) starting from one on the catalyst carrier body ( 42 ) ( 49 ) in an exhaust gas flow direction ( 37 ) and radially outward to one at the first pipe region ( 31 ) supporting area ( 51 ), characterized in that the first tube region ( 31 ) directly to at least one flange ( 17 ), wherein the at least one flange ( 17 ) to the at least one exhaust emission opening ( 9 ), and wherein between the first pipe region ( 31 ) and the second tube region ( 39 ) a third tube region ( 67 ) with a radial shoulder ( 69 ), wherein an inner diameter (D4) of the third pipe region ( 67 ) is smaller than an inner diameter (D1) of the first pipe region ( 31 ) and larger than an inner diameter (D2) of the second tube region ( 39 ), and where the radial shoulder ( 69 ) is provided, the at least one catalyst carrier body ( 42 ) in the exhaust gas flow direction ( 37 ) to fix. Exhaust treatment arrangement according to claim 10, wherein the first pipe region ( 31 ), the second pipe section ( 39 ) and the third pipe area ( 67 ) of the at least one catalyst holder tube ( 27 ) are integrally formed from a single piece of pipe. Exhaust treatment arrangement according to claim 10 or 11, wherein the at least one catalyst carrier body ( 42 ) one the at least one flange ( 17 ) facing the axially front end portion and one of the at least one flange ( 17 ) facing away from the axially rear end portion and at least at the front and rear end portions radially opposite the first pipe portion ( 31 ) is supported. Exhaust gas treatment arrangement according to claim 12, wherein in the front and / or rear end region a cuff formed as a braid and / or knitted fabric and / or tissue ( 59 in particular wire between the at least one catalyst carrier body ( 42 ) and the inner shell of the first pipe region ( 31 ) is inserted. Exhaust treatment arrangement according to claim 13, wherein the at least one catalyst carrier body ( 42 ) at the front end region through the spacer sleeve ( 47 ) and at its rear end by the cuff ( 59 ) is supported against the first pipe region. Exhaust treatment arrangement according to claim 13, wherein the collar ( 59c ) radially between one on the first pipe region ( 31c ) supporting area ( 51c ) of the spacer sleeve ( 47c ) and the at least one catalyst carrier body ( 42c ) is inserted. Exhaust gas treatment arrangement according to one of claims 6 to 13, wherein, as seen in Axiallängsschnitt, the spacer sleeve ( 47 ) starting from one on the catalyst carrier body ( 42 ) ( 49 ) in an axial direction and radially outward to one at the first tube region ( 31 ) supporting area ( 51 ). Exhaust treatment arrangement according to one of claims 6 to 16, wherein the at least one spacer sleeve ( 47 ) in an axial direction over a region on which the spacer sleeve ( 47 ) is radially supported on the first tube portion, extending out and radially inward. Exhaust treatment arrangement according to one of claims 6 to 17, wherein both at a front and at a rear end portion of the catalyst carrier body ( 42 ) a spacer sleeve ( 47 ), both spacers ( 47 ) in a common axial direction of their at the at least one catalyst carrier body ( 42 ) ( 49 ) to that at the first pipe area ( 31 ) supporting area ( 51 ). Exhaust treatment arrangement according to one of claims 6 to 18, wherein an inner jacket of the first pipe region ( 31e ) a circumferential groove ( 71 ) and the spacer sleeve ( 47e ) with the circumferential groove ( 71 ) is engaged and in particular locked in this. Exhaust treatment arrangement according to one of claims 6 to 18, wherein the spacer sleeve ( 47a ) frictionally engaged on an inner casing of the first pipe region ( 31a ) is present. Exhaust treatment arrangement according to one of claims 6 to 18, wherein the spacer sleeve ( 47 ) with an inner jacket of the first pipe region ( 31 ) is welded or soldered. Exhaust treatment arrangement according to one of claims 1 to 21, wherein the at least one catalyst carrier body ( 42 ) with substantially its entire axial length in the first tube region ( 31 ) is recorded. Exhaust treatment arrangement according to one of claims 1 to 22, wherein a diameter (D3) of the at least one catalyst carrier body ( 42a ) is equal to or greater than the inner diameter (D2) of the second tube region ( 39a ). Exhaust treatment arrangement according to one of claims 1 to 23, wherein a distance (B) between the at least one flange ( 17 ) and the at least one catalyst carrier body ( 42 ) is less than 1 m, in particular less than 0.5 m and in particular less than 0.25 m. Exhaust treatment arrangement according to one of claims 1 to 24, wherein an outer jacket ( 45 ) of the at least one catalyst carrier body ( 42 ) at a distance (A) from an inner shell of the first pipe region ( 31 ) is arranged. Exhaust treatment arrangement according to one of claims 1 to 25, wherein the exhaust gas treatment arrangement, a plurality of combustion engine-related exhaust gas catalysts ( 29g ), each of which comprises at least one cylindrical catalyst carrier body ( 42g ), a plurality of groups of a plurality of pipe flanges ( 17g ), each pipe flange ( 17g ) for direct coupling to in each case one of the plurality of exhaust emission openings ( 9g ), and a plurality of catalyst holding tubes ( 27g ), each having a first tube region ( 31g ), in which at least one catalyst carrier body ( 42g ), each of the catalyst support tubes ( 27g ) via a branch pipe ( 75 ) to the pipe flanges ( 17g ) is in each case coupled to a group of pipe flanges.