DE19739476A1 - Catalytic-unit-mounting near car engine - Google Patents

Abstract

The housing (1) has a supporting body (4) with lengthwise passages (8) separated by partitions (7). The housing is split in a plane (E) at right angles to the passages, with a connecting plate (5) in this plane between the halves, and which encloses the supporting body. The plate can have one or more annular faces (9) forming a sealed joint with parts of the exhaust system.

Description

The object of the invention relates to a catalyst carrier arrangement tion and a structural unit and an exhaust system of a combustion engine.

For the catalytic conversion of the components of an exhaust gas of a ver Internal combustion engine it is known on a catalyst carrier body to apply at least one catalytically active substance. The catalyst Carrier body has gas channels through which an exhaust gas can flow. The Gaska channels extend in the longitudinal direction of the catalyst carrier body. It is known to form a catalyst carrier body honeycomb. The Kataly sator carrier body can consist of at least partially structured sheet metal layers be educated. Furthermore, catalyst carrier bodies are known which consist of a ceramic material exist. Such catalyst carrier body extruded.

The catalyst carrier body is arranged in a housing which is a Is part of an exhaust system. Depending on the material of the Kataly Sator carrier body different configurations of the housing are necessary dig.  

WO 90/02251 is a housing with a catalyst carrier body known, which in particular for installation close to the engine within the Exhaust system is suitable. The housing has a larger cross section on than the catalyst carrier body. The case has an approximately right corner-shaped opening whose length is greater than the maximum length of the Catalyst carrier body and its width is greater than the maximum width of the Are catalyst carrier body. The catalyst carrier body is on a flat or arched mounting plate attached, which has a greater length and width than the opening in the case. The holding plate serves as a cover for the Housing, the catalyst carrier body in an interior of the housing it protrudes. This will simplify the installation and removal of the Allows catalyst carrier body in or out of the housing.

Further configurations of catalyst carrier arrangements are, for example known from WO 96/27735, WO 96/01698 and WO 96/19647.

Especially in internal combustion engines that are used in passenger vehicles to be installed is to install a catalyst carrier body close to the engine not without problems, since the spatial conditions within one Engine compartment of the vehicle are relatively cramped.

Proceeding from this, the present invention is based on the objective de to provide a catalyst carrier assembly which is an assembly of Catalyst carrier body in the vicinity of the internal combustion engine possible. Another object of the invention is to provide a structural unit through the assembly of at least two catalyst carrier bodies in the Proximity of the internal combustion engine is simplified. Another goal of Invention, it is an exhaust system of an internal combustion engine ben, which can be produced with little effort.  

This object is achieved by a catalyst carrier arrangement according to claim 1, a unit according to claim 12 or an exhaust system according to claim 15 solved. Advantageous further developments and refinements are the subject of Subclaims.

The catalyst carrier arrangement according to the invention has a two-part Housing in which a catalyst carrier body with a variety of separated from each other by partitions, in the longitudinal direction of the Kataly satorträgerkörpers extending, channels is arranged. The housing is in one essentially transverse to the longitudinal direction of the channels Division level divided. There is a plate-shaped between the housing parts Connection element provided. The connecting element surrounds the Kataly sator carrier body. It is on the division level. This is the ver binding element essentially transverse to the longitudinal direction of the channels orderly. This configuration of the catalyst carrier according to the invention arrangement opens up the possibility of this catalyst carrier arrangement in to be arranged in the vicinity of an internal combustion engine. The catalyst carrier body with its two-part housing is directly in arranged an exhaust gas flow path. The plate-shaped connecting element ment serves as a fastening part with at least one component of the Ab gas system. This configuration of the catalyst supports according to the invention The arrangement also enables existing combustion to be retrofitted engines, causing an emission of certain pollutant components of the exhaust gas can be reduced.

The catalyst carrier arrangement is preferably designed such that the Connecting element at least one sealing surface for the sealing connection with at least one component of the exhaust system. The dense The surface is preferably annular, so that this is the catalyst  surrounds the support body. An embodiment of the catalytic converter is preferred Gate arrangement in which the connecting element itself forms a seal.

In particular, such a configuration of the catalyst carrier arrangement enables an immediate installation of the same near the combustion engine, since additional sealants can be dispensed with. So the connecting element forms, for example, a seal between one Engine block and a manifold of the internal combustion engine. Through the Proximity of the catalyst carrier arrangement to the combustion chamber of a ver internal combustion engine will heat up the catalyst relatively quickly Carrier body reached, whereby the catalyst carrier within a short time arrangement can be fully effective.

The connecting element is preferably in the form of a metallic seal trained.

Depending on the geometry of the seal, it may be expedient, the connecting element with at least one sealing element To design, thereby reducing the manufacturing cost of the connecting element can be reduced.

In order to achieve a high stability of the catalyst carrier arrangement proposed that the connecting element with at least one housing part is soldered. This configuration ensures that the Kataly satorträgerkörper and / or a housing part caused forces in the Ver binding element can be initiated.

According to a further advantageous embodiment, the catalyst carrier arrangement tion is proposed that the catalyst carrier body is a metallic Catalyst carrier body is. This configuration of the catalyst carrier arrangement  voltage also enables a soldered connection between the catalyst carrier body per and the connecting element and between the catalyst carrier body by and at least one housing part in which the catalyst carrier body is arranged.

The metallic catalyst carrier body can be at least partially structured sheet layers. Alternatively, the catalyst carrier body can be made of be made of a sintered metal.

Instead of a metallic catalyst carrier body, a kerami can also be used shear catalyst carrier body can be used. However, this is too note that the different thermal expansions due to the different coefficients of expansion of the materials of the catalyst carrier body and the housing, which is a metallic housing acts must be compensated for by appropriate measures.

According to a further advantageous embodiment, the catalyst carrier arrangement tion is proposed that the catalyst carrier body at least one Has area that has at least one channel that opposite the other channels has an enlarged cross section. Through this The measure is such that the flow behavior of the exhaust gas flow is not or only influenced to a very small extent by the catalyst carrier is flowing. This influence is particularly important if this feedback on the mixture formation within a combustion space of an internal combustion engine.

According to a further inventive idea, a structural unit is included at least two catalyst carrier arrangements according to one of claims 1 to 11 proposed, the catalyst support arrangements a common have the same connecting element. The number of catalyst support assemblies  Solutions preferably corresponds to a number of outlet channels of a ver internal combustion engine. As a result, the assembly effort of an exhaust gas tems reduced. In particular in the case of a structural unit whose number is Catalyst carrier arrangements of the number of exhaust channels of a combustion nungskraftmaschine corresponds, with a suitable design of the Ver Internal combustion engine and design of the structural unit adapted to this, this unit is directly connected to the internal combustion engine be so that part of each catalyst carrier body in an off let channel of the internal combustion engine protrudes.

Such a unit is preferably designed such that each Catalyst carrier within an area delimited by the sealing surface is arranged. Alternatively, common to each catalyst support corresponding connecting element corresponding seals are formed.

According to a further idea according to the invention, an exhaust system an internal combustion engine with a catalyst carrier arrangement one of claims 1 to 11 and / or with a structural unit according to claim 12 or 13 proposed, wherein the exhaust system at least one exhaust gas has flow path in which a catalyst carrier body at least partially is arranged. The exhaust system enables the installation of catalytic converters door support bodies in the immediate vicinity of an internal combustion engine.

There is preferably one catalyst support in each flow path body arranged, thereby reducing the emission of pollutant com components of the exhaust gas can be reduced.

In order to make the exhaust system as effective as possible, and in order to avoid bypass flows of an exhaust gas, it is proposed that each catalyst carrier body with a housing has a cross section,  which ent essentially a cross section of an exhaust gas flow path speaks.

According to a further advantageous embodiment of the exhaust system with at least one elbow which has at least one flange for connection has an internal combustion engine, it is proposed that Connecting element can be brought into contact with the flange. In particular is the connecting element is designed so that it is gastight with the flange and the internal combustion engine is connectable.

Further details and advantages of the invention are described in the Illustrated embodiments illustrated. Show it:

Fig. 1 shows a first embodiment of a catalyst support arrangement in a front view,

Fig. 2, the catalyst carrier assembly cut in a side view and in full,

Fig. 3 is an enlarged a detail X of Fig. 2,

Fig. 4 shows a second embodiment of a catalyst support arrangement in a front view,

Fig. 5 is a side elevational view in full section of the catalyst support structure according to Fig. 4,

Fig. 6 shows a detail X in FIG. 5,

Fig. 7 is a part of an exhaust system in section and

Fig. 8 shows a unit in a front view.

Fig. 1 and 2 show a first embodiment of a catalyst support arrangement. The catalyst carrier arrangement has a housing 1 which is formed in two parts. The housing 1 has a first housing part 2 and a second housing part 3 . The first 2 and the second 3 housing part is essentially tubular. A catalyst carrier body 4 is arranged inside the housing 1 . The catalyst carrier body 4 has a multiplicity of channels 8 , which are separated from one another by partition walls 7 and extend in the longitudinal direction of the axis 12 of the catalyst carrier body 4 . In the illustrated embodiment, the catalyst carrier body 4 is formed by at least partially structured sheet metal layers which are essentially S-shaped. Other configurations of the catalyst carrier body 4 are possible.

The housing 1 is subdivided into a division plane E which runs essentially transversely to the longitudinal direction of the channels 8 . In the exemplary embodiment shown, the division plane E essentially lies in a plane of symmetry of the catalyst carrier body 4 . However, this is not mandatory.

A plate-shaped connecting element 5 is arranged between the first 2 and the second 3 housing part. The connecting element 5 lies in the division plane E. The catalyst carrier 4 penetrates the connecting element 5 . For this purpose, the connecting element 5 has a through opening 13 adapted to the outer contour of the catalyst carrier body 4 .

The metallic catalyst carrier body 4 is at least partially connected to the first 2 and the second 3 housing part of the housing 1 . The connection between the catalyst carrier body 4 and the first or the second housing part is preferably a soldered connection. There is also preferably a soldered connection between the connecting element 5 and the catalyst carrier body 4 . In addition, there may be a solder connection between the connec tion element 5 and the first 2 and the second 3 housing part of the housing 1 .

The connecting element 5 has two bores 6 through which fastening elements, in particular screws, can extend, by means of which the catalyst carrier arrangement is connected to an exhaust system.

The connecting element 5 is designed as a seal which has at least one sealing surface 9 .

As can be seen in particular from FIG. 1, the catalyst carrier body 4 has two spaced apart channels 14 formed, having a larger cross section than the other channels 8 of the catalyst support body 4. The channels 14 are essentially formed in the central region of the catalyst carrier body 4 . In the example shown in Fig. 1 catalyst support body 4, the channels are formed in the regions 14 in which mandrels engage for the production of the support body 4 Kataly sator. The catalyst carrier body is preferably produced in accordance with the method known from WO 97/00725 or WO 97/00135.

Fig. 4, 5 and 6 show a second embodiment of a Katalysa torträgeranordnung. The catalyst carrier arrangement has a two-part housing 1 . In the housing 1 , a catalyst carrier body 4 is net angeord. The catalyst carrier body 4 has a multiplicity of channels 8 separated from one another by partition walls 7 . The channels 8 extend in the longitudinal direction of the catalyst carrier body. The partitions can be formed by at least partially structured sheets.

The housing 1 is subdivided into a division plane E which runs essentially transversely to the longitudinal direction of the channels 8 , so that the housing 1 has a first housing part 2 and a second housing part 3 . Each housing part 2 , 3 partially surrounds the catalyst carrier body 4 . Between the first 2 and the second 3 housing part of the housing 1 , a connecting element 5 is arranged. The connecting element 5 is plate-shaped. It is arranged in the division plane E. The connecting element 5 has a through opening 13 through which the catalyst carrier body 4 extends. The shape of the passage opening 13 corresponds essentially to the outer contour of the catalyst carrier body 4 . The inner edge 15 of the through opening 13 lies on the jacket of the catalyst carrier body 4 . The connecting element 5 is preferably soldered to the catalyst carrier body 4 .

The connecting element 5 has seals 16 on both sides. The seals end at a distance from the first 2 and the second 3 housing part, as can be seen in particular from FIG. 6.

The catalyst carrier arrangement according to the invention is particularly suitable for installation close to the engine. FIG. 7 shows the catalyst carrier arrangement shown in FIG. 1 in the installed state. An engine block 16 of an internal combustion engine has an exhaust duct 17 . The mouth of the outlet channel 17 is surrounded by a sealing surface 18 . In the laßkanal from 17 partially extends a catalyst carrier body 4 . The catalyst carrier body 4 is arranged in a two-part housing. The section of the catalyst carrier body 4 arranged in the first housing part 2 projects into the outlet channel 17 . The connecting element 5 arranged between the first 2 and the second 3 housing part rests on the sealing surface 18 . The connecting element 5 is designed as a metallic seal. Threaded bolts 19 extend through the openings 6 of the connecting element 5 a. The second housing part 3 protrudes with the section of the catalyst carrier body 4 arranged in the second housing part 3 into a channel 21 of the manifold 20 . The channel 21 forms an exhaust gas flow path for an exhaust gas of the internal combustion engine.

The manifold 20 has a flange 22 . The flange 22 has holes 23 which are ausgebil det corresponding to the holes 6 of the connecting part 5 . The threaded bolts 19 , which are connected to the engine block 16 , extend through the bores 6 of the connecting part 5 and the bores 23 of the flange 22 . To fix the manifold 20 and the connecting element 5 to the engine block 16 , nuts 24 are screwed onto the threaded bolts 19 .

As already explained above, the connecting element 5 is designed in the form of a metallic seal. This configuration of the connecting element 5 produces a gas-tight connection between the engine block 16 and the manifold 20 . For this purpose, the connecting element 5 rests on the sealing surface 18 of the engine block 16 . The flange 22 also has a sealing surface 11 which comes to bear on the connecting element 5 .

The manifold forms part of one with the catalyst carrier assembly Exhaust system of an internal combustion engine.

If an internal combustion engine has a plurality of outlet channels 17 , a catalyst carrier arrangement can be introduced into each outlet channel, as is shown in FIG. 7. To simplify the assembly, a structural unit according to FIG. 8 is proposed. In the exemplary embodiment shown, the assembly 25 has 4 catalyst carrier bodies 4 . Each catalyst carrier body 4 is arranged in a two-part housing. Each housing is in a common in a subdivision plane in wesentli Chen transverse to the longitudinal direction of the channels divides. Between the housing parts, a common plate-shaped Ver connecting element 26 is provided. The connecting element 26 lies in the common division plane. The basic structure of the housing and the catalyst carrier body and its arrangement in the housing essentially corresponds to the embodiment of a catalyst carrier arrangement shown in FIG. 1.

In FIG. 8, the connecting element is in the form of a metallic gasket 26. Alternatively, the connecting element 26 may be provided with ducts, each lying in a plane parallel to the plane of the plate-shaped connecting element 26 . The sealing elements, which are not shown in FIG. 8, have sealing surfaces in which the catalyst carrier bodies 4 are arranged.

Instead of a metallic catalyst carrier body, a ceramic one can also be used Catalyst carrier bodies are used.  

Reference list

1

casing

2nd

first housing part

3rd

second housing part

4th

Catalyst carrier body

5

Fastener

6

drilling

7

partition wall

8th

channel

9

Sealing surface

10th

drilling

11

Sealing surface

12th

axis

13

Through opening

14

channel

15

Inside edge

16

Engine block

17th

Exhaust duct

18th

Sealing surface

19th

Threaded bolt

20th

Manifold

21

channel

22

flange

23

drilling

24th

mother

25th

Component

26

Fastener

Claims (18)

1. catalyst carrier arrangement with a two-part housing ( 1 ), in which a catalyst carrier body ( 4 ) with a plurality of by partition walls ( 7 ) separated from each other, in a longitudinal direction of the catalyst carrier body ( 4 ) extending, channels ( 8 ) is arranged, thereby characterized in that the housing ( 1 ) is subdivided into a parting plane (E) running essentially transversely to the longitudinal direction of the channels ( 8 ) and between the housing parts ( 2 , 3 ) a part lying in the parting plane (E), the catalyst carrier body ( 4 ) surrounding, plate-shaped connecting element ( 5 ) is provided. 2. A catalyst carrier arrangement according to claim 1, characterized in that the connecting element ( 5 ) has at least one sealing surface ( 9 ) for the sealing connection with at least one component of the exhaust system. 3. A catalyst carrier arrangement according to claim 2, characterized in that the sealing surface ( 9 ) is annular. 4. A catalyst carrier arrangement according to claim 1, 2 or 3, characterized in that the connecting element ( 5 ) forms a seal. 5. A catalyst carrier arrangement according to claim 4, characterized in that the connecting element ( 5 ) forms a metallic seal. 6. A catalyst carrier arrangement according to claim 1, 2 or 3, characterized in that at least one sealing element ( 11 ) is arranged on the connecting element ( 5 ). 7. catalyst carrier arrangement according to one of claims 1 to 6, characterized in that the connecting element ( 5 ) with at least one housing part ( 2 , 3 ) is soldered. 8. A catalyst carrier arrangement according to one of claims 1 to 7, characterized in that the catalyst carrier body ( 4 ) is a metallic catalyst carrier body. 9. A catalyst carrier arrangement according to claim 8, characterized in that the catalyst carrier body ( 4 ) is at least soldered to the connecting element ( 5 ). 10. A catalyst carrier arrangement according to one of claims 1 to 7, characterized in that the catalyst carrier body ( 4 ) is a ceramic catalyst carrier body. 11. A catalyst carrier arrangement according to one of claims 1 to 10, characterized in that the catalyst carrier body ( 4 ) has at least one region which has at least one channel ( 14 ) which has a larger cross section than the other channels. 12. Unit with at least two catalyst carrier arrangements according to one of claims 1 to 11, wherein the catalyst carrier arrangements have a common connecting element ( 25 ). 13. The assembly according to claim 12, characterized in that each catalyst carrier ( 4 ) is arranged within a surface delimited by the sealing surface. 14. Exhaust system of an internal combustion engine with a catalyst carrier arrangement according to one of claims 1 to 11 and / or with a structural unit according to claim 12 or 13, wherein the exhaust system has at least one exhaust gas flow path ( 17 , 21 ) in which a catalyst carrier body is at least partially arranged. 15. Exhaust system according to claim 14, characterized in that a catalyst carrier body ( 4 ) is arranged in each flow path. 16. Exhaust system according to claim 14 or 15, characterized in that each catalyst carrier body ( 4 ) with housing has a cross section which corresponds essentially to a cross section of the exhaust gas flow path ( 17 , 21 ). 17. Exhaust system according to claim 14, 15 or 16 with at least one manifold ( 20 ), the at least one flange ( 22 ) for connection to an internal combustion engine ( 16 ), characterized in that the connecting element ( 5 ) for abutment on the flange ( 22nd ) can be brought. 18. Exhaust system according to claim 17, characterized in that the connecting element ( 5 ) gas-tight with the flange ( 22 ) and the internal combustion engine ( 16 ) can be connected.