WO2007033767A1

WO2007033767A1 - Housing for an exhaust-gas cleaning device

Info

Publication number: WO2007033767A1
Application number: PCT/EP2006/008684
Authority: WO
Inventors: Peter Kroner; Erich Forster; Stefan MERSCHKÖTTER; Otto Steinhauser
Original assignee: Emcon Technologies Germany (Augsburg) Gmbh
Priority date: 2005-09-20
Filing date: 2006-09-06
Publication date: 2007-03-29
Also published as: DE102005044810A1

Abstract

The invention relates to an assembly for accommodating two substrates (14, 20) for an exhaust-gas cleaning device, comprising a first housing (10) and a second housing (16) arranged downstream of the first housing (10), these housings being connected to one another, wherein at least one of the housings is a winding housing, characterized in that at least one of the mutually facing ends of the two housings (10, 16) is calibrated and the two mutually facing ends of the two housings (10, 16) are connected directly to one another. The invention also relates to a method of producing a corresponding assembly.

Description

Housing for an exhaust gas purification device

The invention relates to an assembly for receiving two substrates for an exhaust gas purification device, comprising a first housing and a second housing disposed downstream of the first housing, which are interconnected, wherein at least one of the two housings is a winding housing. The invention also relates to a method for producing such an assembly.

In the exhaust gas purification device is in particular a combination of catalyst and particulate filter, as used in modern motor vehicles with diesel internal combustion engine. FIG. 1 shows an example of such an assembly. It has a first housing 10 in which a substrate 14 is received via a bearing mat 12. The substrate may be provided with a catalytically active coating so that a catalyst is formed. Viewed in the flow direction P, downstream of the first housing 10, a second housing 16 is arranged, in which a substrate 20 is held over a bearing mat 18. The substrate 20 may be, for example, a ceramic body with very small pores, so that a particle filter is formed. Between the first housing 10 and the second housing 16 is an intermediate ring 22 which has two functions. On the one hand, it serves for mechanical and gastight connection of the first housing 10 to the second housing 16. For this purpose, the downstream end of the first housing 10 is connected to the upstream end of the intermediate ring 22 by a weld 24, and the downstream end of the intermediate ring 22nd is also connected to the upstream end of the second housing 16 by a weld 24. On the other hand, the intermediate ring 22 serves to receive a sensor 26 which serves to detect various parameters of the exhaust gas flowing through the assembly formed by the housings and the substrates, or to accommodate other connections, e.g. for a pressure line.

The assembly described has the disadvantage that their production is relatively expensive. The object of the invention is to provide an assembly of the type mentioned, which can be produced inexpensively and with improved durability.

To achieve this object, the invention provides that at least one of the mutually facing ends of the two housings is calibrated and the two mutually facing ends of the two housings are directly connected to one another. The invention is based on the recognition that the intermediate ring as such between the first housing and the second housing is not required. When at least one of the two ends of the housings to be connected together is appropriately calibrated, the two ends can also be directly connected to each other. In this way, the intermediate ring and a weld are saved, which leads to significant cost advantages.

It is preferably provided that the connected to the other housing end of the housing is made extended, so that an intermediate portion for attachment of other components is provided, for example, a sensor. In this way, with little effort, the space can be created, which was created in the prior art by the intermediate ring.

Preferably, the intermediate portion has a flat portion.

This planar section can be made with little effort in calibrating the end of the intermediate section facing the other housing, and then greatly facilitates the attachment of a socket for a sensor or other terminals. This can then be attached in a simple manner, for example by resistance welding.

With regard to calibration, there are various ways to plastically deform the two ends in a suitable manner. For example, one of the ends may be left unaltered in its diameter, while the other end is widened or compressed in diameter. It is also possible to widen or compress both ends. It is also possible hineinzustecken the first case in the second housing or aufzustecken on this. Furthermore, it is possible to conically form at least one of the two ends to be joined by calibrating, so that the other housing is either blunt attached to the conical end or, if both ends are conical, are arranged overlapping each other. Depending on the requirements, only one end can be calibrated, or both ends can be calibrated. It should be noted that the list of the various embodiments of the ends to be joined together is not exhaustive.

According to a preferred embodiment of the invention it is provided that the two interconnected ends have a latching geometry, for example, an inwardly facing embossing, by means of which they engage positively in one another in the pre-assembled state. This simplifies the connection of the two housings, since they then need not be kept positioned during welding or soldering, but remain alone in the desired position.

The two housings are in particular winding housings with a jacket, which has been wound around the substrate and then closed.

For these enclosures, the calibration is to be interconnected

Ends of particular importance, since the diameter of the housing in large

Dimensions vary. The substrate arranged in the corresponding housing is in fact subject to very large tolerances, which then have an effect in correspondingly large tolerances of the jacket wound around the substrate.

According to the invention, a method for producing an assembly for receiving two substrates for an exhaust gas purification device is provided to achieve the above object, in which the following steps are used: First, a first and a second housing are provided, wherein a downstream end of a housing with to be connected to the upstream end of the other housing. Of the two ends to be joined, at least one is calibrated. Subsequently, the two ends are directly connected. With regard to the advantages of this method, reference is made to the above explanations.

The mutually facing ends of the two housings can in particular be welded or soldered together. According to a preferred embodiment of the invention, it is provided that the end of the housing to be calibrated is supported on the inside during calibration. It has been found that in this way a better dimensional stability is achieved.

If the housing to be calibrated are winding housings, it is provided that the end of the housing to be calibrated is calibrated by means of a calibration tool which has a recess for an overlapping region of the jacket of the housing. In this way it is ensured that no disturbing paragraph is formed on the opposite side of the recess of the housing.

The invention will be described below with reference to various embodiments, which are illustrated in the accompanying drawings. In these show:

- Figure 1 is a schematic section through an assembly according to the prior art;

- Figure 2 is a schematic section through a first embodiment of an assembly according to the invention;

- Figure 3 is a schematic section along the plane IH-III of Figure 2;

- Figures 4 to 10 are each a schematic section through further embodiments of the assembly according to the invention;

- Figure 1 1 is a schematic section through a variant of an assembly according to the invention;

FIG. 12 shows a schematic section along the plane XII-XII of FIG. 11; - Figure 13 is a schematic sectional view of another embodiment of an assembly according to the invention;

- Figure 14 on an enlarged scale, the detail XIV of Figure 13;

FIG. 15 shows schematically a calibration tool in a cross section; and

FIG. 16 shows a schematic section through a housing during calibration. For the following description of the embodiments according to the invention, the same reference numerals are used for the components known from the above description of the prior art.

FIG. 2 shows the first housing 10 with substrate 14 and the second housing 16 with substrate 20. It is for the invention without

Meaning, which function the substrate has in the corresponding housing.

Each of the housings is formed by a lateral surface and a funnel. The first housing has an inlet funnel (not shown) at its upstream end, and the second housing has an outlet funnel (not shown) at its downstream end. Since only the jacket of the housing is of importance for the present invention, generalizing the jacket will be equated below with the housing.

The second housing 16 has at its upstream, the first

Housing 10 facing the end an intermediate portion 30, which is designed as a one-piece extension of the shell. In other words, that is

Mantle of the second housing 16 executed over long, so that in the axial

Direction over the substrate 20 protruding intermediate portion 30 is formed.

In this embodiment, the diameter of the first housing 10 and the second housing 16 are substantially equal. The two mutually facing ends of the two housings are calibrated to certain dimensions, that is brought to specific dimensions in the radial direction by plastic deformation (either expansion or compression). While the dimensions at the upstream end of the second housing 16 are substantially unchanged from the values present in the region of the second substrate 20, the first housing 10 is flared at its downstream end by the amount of wall thickness of the housing. In other words, the inner diameter of the first housing 10 at the downstream end (except perhaps apart from a joint gap) corresponds to the outer diameter of the second housing 16 at the upstream end. This makes it possible to insert the second housing 16 into the first housing 10 and to weld the two housings together. (See weld 24).

On the intermediate portion 30 of the sensor 26 is arranged. As can be seen in FIG. 3, the two housings 10, 16 are winding housings in which the jacket is wound around the respective substrate with associated bearing mat and then closed by a weld seam 32 extending approximately parallel to the longitudinal axis and throughflow direction of the housing , The cross-sectional shape of the two housings 10, 16 is almost arbitrary. The housing may be circular, oval, trioval (as shown in Figure 3), or have any other suitable cross-sectional shape.

In the embodiment shown in Figure 4, the downstream end of the first housing 10 is calibrated inwardly, so that the first housing 10 is inserted into the second housing 16.

In the embodiment shown in FIG. 5, both the two ends of the first and the second housing 10, 16 to be connected to one another and the intermediate section 30 are made retracted. Their diameter is thus smaller than the diameter of the housings 10, 16 in the region of the substrates 14, 20. Furthermore, the diameter of the downstream end of the first housing 10 is smaller by the amount of the wall thickness of the second housing 16 than the dimensions of the upstream end of the second housing 16. The first housing 10 is thus inserted into the second housing 16.

In the embodiment shown in Figure 6, the different

Dimensions of the downstream end of the first housing 10 and the upstream end of the second housing 16 from each other so that the first housing is attached to the second housing.

In the embodiment shown in Figure 7, both the two ends of the first and the second housing 10, 16 to be joined together and the intermediate portion 30 are exposed to the outside. The first housing 10 is inserted into the second housing 16. In the embodiment shown in Figure 8, the first housing 10 is attached to the second housing 16.

FIG. 9 shows an embodiment in which the intermediate section

30, which is again embodied here in one piece with the second housing 16, essentially continues to run unchanged in terms of diameter, while the downstream end of the first housing 10 is conically set by the calibration. The upstream end of the second housing 16 is placed blunt on the conical end portion of the first housing 10 and welded there with a weld 24. Compared to the previously described embodiments, this embodiment has the advantage that the upstream end of the second housing 16 need not be calibrated, but only a single end must be calibrated, namely the end of the first housing 10. tolerances of the diameter of the upstream end of the second housing 16 affect only by the fact that the line of contact between the two housings further inside or further out on the conically set end portion. In the embodiments shown in Figures 2 to 8, however, the two ends to be joined together must be calibrated so that they rest against each other as well as possible tolerances of the housing.

FIG. 10 shows an embodiment in which the two ends to be joined together are conically set by the calibration. As a result, the two ends overlap again when the housings are attached to each other.

FIGS. 11 and 12 show an exemplary embodiment in which the intermediate section 30 is provided with a flat section 34 during the calibration, for example by embossing. This embodiment has the advantage that the

Sensor 26 can be mounted much easier than on a curved

Area.

When calibrating, a detent geometry can also be molded onto the ends of the two housings 10, 16 which are to be connected to one another. An example of such a detent geometry is shown in FIGS. 13 and 14. The two

Housing 10, 16 are provided at the edges to be joined together in each case with an embossment 36, 38, which may be formed in the manner of a circumferential groove or even selectively. When the two housings 10, 16 are attached to each other, the embossing 38 of the first housing 10 engages under the embossment 36 of the second housing 16, so that the two parts are pre-mounted or pre-fixed. The locking geometry also serves to limit the maximum insertion depth of a housing in the other. One Another advantage of the latching geometry is that a cross-sectional constriction is formed immediately before the gap to the bearing mat 18 in the second housing 16. This reduces the risk of damage to the bearing mat by the exhaust flow in this area.

In the embodiment of Figure 13 it can be seen that the intermediate section

30 may of course also be formed on the first housing 10.

FIGS. 15 and 16 schematically show the calibration of one end of a housing. FIG. 15 shows a plurality of calibration jaws 40 with which an end to be calibrated can be compressed. The reference numeral 42 shows a plurality of calibration jaws with which an end to be calibrated can be widened. In the corresponding calibration tool, a recess 44 or 46 is provided in which the overlapping region of the jacket of the corresponding housing comes to rest. The recess 44 provided in the calibrating jaws 40 ensures, in the case of the first housing 10 shown in FIG. 3, that a smooth surface results on the inside after the calibration. The recess 46 provided in the calibrating jaws 42 makes it possible, in the case of the second housing 16 shown in FIG. 3, for a smooth surface to be obtained on the outside.

In Figure 16 it can be seen that consisting of the Kalibrierbacken 40, 42 existing

Calibration tool regardless of whether the diameter is reduced or increased during calibration, both on the inside and on the outside of the corresponding housing engages.

LIST OF REFERENCE NUMERALS:

10: first housing

12: storage mat

14: Substrate 16: second housing

18: storage mat

20: substrate

22: intermediate ring

24: weld 30: intermediate section

32: weld

34: plane section

36: imprint

38: stamp 40: calibration jaw

42: Calibration jaw

44: recess

46: recess

Claims

claims

An assembly for receiving two substrates (14, 20) for an exhaust gas purification device, comprising a first housing (10) and a second housing (16) disposed downstream of the first housing (10), which are interconnected, at least one the housing is a winding housing, characterized in that at least one of the mutually facing ends of the two housings (10, 16) is calibrated and the two mutually facing ends of the two housings (10, 16) are directly connected to one another.

2. An assembly according to claim 1, characterized in that the one with the other housing (10, 16) connected end of a housing (16, 10) is designed extended, so that an intermediate portion (30) for attachment of other components (26) created is, for example, a sensor.

3. Assembly according to claim 3, characterized in that the intermediate portion (30) has a flat portion (34).

4. Assembly according to one of claims 1 to 3, characterized in that with the other housing (10, 16) connected to the end of a housing (16, 10) is widened.

5. Assembly according to one of claims 1 to 3, characterized in that with the other housing (10, 16) connected to the end of a

Housing (16, 10) is compressed.

6. Assembly according to one of the preceding claims, characterized in that overlap the interconnected ends.

7. An assembly according to any one of claims 1 to 5, characterized in that with the other housing (10, 16) connected to the end of a

Housing (16, 10) is conical.

8. An assembly according to claim 7, characterized in that the one with the other housing (10, 16) connected end of the one housing (16, 10) butt to the end of the other housing (10, 16).

9. Assembly according to one of the preceding claims, characterized in that both ends are calibrated.

10. An assembly according to any one of the preceding claims, characterized in that the two interconnected ends have a latching geometry (36, 38), by means of which they engage positively in one another in the preassembled state.

1 1. An assembly according to claim 10, characterized in that the latching geometry of at least one inwardly facing embossment (36, 38) at the interconnected ends of the housings (10, 16).

12. An assembly according to any one of the preceding claims, characterized in that the two housings (10, 16) are winding housings with a jacket which has been wound around the substrate (14, 20) and then closed.

13. A method for producing an assembly for receiving two substrates (14, 20) for an exhaust gas purification device by means of the following steps:

- There are a first housing (10) and a second housing (16) is provided, wherein at least one of the housing is a winding housing and wherein a downstream end of the one housing (10, 16) with the upstream end of the other housing (16, 10) should be connected,

- Of the two ends to be joined together, at least one is calibrated;

- The two ends are directly connected.

14. The method according to claim 13, characterized in that the two

Ends are welded together.

15. The method according to claim 13, characterized in that the two ends are soldered together.

16. The method according to any one of claims 13 to 15, characterized in that both ends are calibrated.

17. The method according to any one of claims 13 to 16, characterized in that the calibrated end of the housing (10, 16) during calibration is supported inside and outside.

18. The method according to any one of claims 13 to 17, characterized in that the calibrated end of the housing (10, 16) by means of a Kalibrierwerkzeugs (40, 42) is calibrated, which has a recess (44, 46) for an overlap region of the shell of the housing (10, 16).