DE102007006804A1 - Exhaust gas cleaning device, particularly for exhaust gas plant of internal combustion engine, has outer housing, which comprises two housing parts - Google Patents

Abstract

The exhaust gas cleaning device has an outer housing (12), which comprises two housing parts (14,16), whose end areas (18,20) are connected with each other in detachable manner. A particle filter substrate is arranged in the outer housing. The end areas are connected with each other by automatic screw thread.

Description

The The invention relates to an exhaust gas purification device, in particular for the exhaust system of an internal combustion engine, with an outer housing having at least a first and a second housing part comprises, whose each other facing end regions are detachably connected to each other, and a particle filter substrate disposed in the outer case.

Such an exhaust gas purification device is known from DE 102 96 366 T5 and additionally comprises an oxidation catalyst substrate upstream of the particulate filter substrate. In order to be able to remove the ash residue accumulating in particular on the upstream surface during the regeneration phases of the particle filter substrate, it is provided to provide access to the upstream surface of the particle filter substrate in that the housing is made in several parts. The detachable connection between the housing parts is formed by webs provided on the housing parts and a V-shaped clamp which encompasses the webs. Such clamps are relatively heavy and also expensive.

The The invention provides an exhaust gas purification device facing each other the prior art by lower production costs and a characterized by reduced weight.

According to one First aspect of the invention, this is in an exhaust gas purification device of the type mentioned achieved in that the end portions are interconnected by self-tapping screws. These are distinguished from those mentioned above Clamps by a lower weight and a cheaper price out. In addition, such screws can be mounted very quickly, which compared to conventional screws only a single Work step for the entire connection is incurred. Elaborate component preparations such. B. threading omitted. The resulting lower cycle times in the production the emission control device also result in a cost savings. Another advantage over conventional fittings is that the power transmission over the threads in self-tapping screws cheaper because all threads wear the same. In contrast, in conventional glands the force in most cases to 70% just over worn a thread.

Preferably the screws are flow-hole forming Screws. These can be during the screwing process chipless produce a metric nut thread, which makes it possible the housing parts after a release of the connection and cleaning the particulate filter substrate with ordinary ones Screw again.

alternative The screws may be self-tapping or self-tapping Act screws that make their thread machinable.

According to one Second aspect of the invention is in an exhaust gas purification device of the aforementioned type provided that the end portions are connected by rivets. Also draw riveted joints characterized by rapid assembly, low weight as well (as opposed to Clamps) a small space requirement. The solvability the rivet connections can be achieved in that the Rivets drilled out and when reconnecting the housing parts be replaced by screws and possibly nuts.

According to one preferred embodiment are the housing parts deformed in their mutually facing end portions to one each To form connecting portion, which is preferably perpendicular to Exterior housing extends. The deformed connecting sections replace heavy, welded-on flanges when in use conventional screws for receiving the thread required are. In this way, further weight and manufacturing costs can be save on.

Around to ensure the tightness of the housing during operation, should a seal between the housing parts, in particular a flat gasket and / or a sealing ring made of graphite, be provided.

According to one preferred embodiment, the first housing part is in essentially cylindrical.

The second housing part may be formed as a funnel, resulting in a design with comparatively few components results.

The first and the second housing part are preferably in one End region of the particulate filter substrate connected to each other, wherein in particular the parting plane between the first and the second Housing part just cuts the particle filter substrate.

As already mentioned, an oxidation catalyst substrate be provided, in the axial direction in front of the particle filter substrate is arranged in the outer housing. This serves the Providing for the regeneration of the particulate filter require high exhaust gas temperatures.

Of the End region in which the first and the second housing part are connected to each other, in particular the downstream, the end of the particulate filter substrate remote from the oxidation catalyst substrate. This embodiment, in which the connection region of the two housing parts provided near an axial end of the outer housing is, offers advantages in terms of placement in the exhaust system as well as the accessibility of the connection area.

The Oxidation catalyst substrate is preferably immediately in the first Housing part held, about with the interposition of a compressed storage mat clamped.

Around a removal of the particulate filter substrate from the outer housing To facilitate, the particulate filter substrate preferably has a it on its circumference surrounding housing shell, in Axial direction almost completely into the first housing part is inserted.

there can the housing shell with the second housing part connected, in particular soldered. When opening of the outer housing by separating the two housing parts So is the arranged in its housing shell particle filter substrate together with the second housing part from the first housing part pulled out.

Further Features and advantages of the invention will become apparent from the following Description of several preferred embodiments with reference to FIG attached drawings. In these show:

1 an exploded view of an exhaust gas purification device according to a first aspect of the invention;

2 a perspective view of the exhaust gas purification device 1 ;

3 a perspective partial section through the exhaust gas purification device of 1 and 2 in the connection region of the two housing parts;

4 a sectional view of the exhaust gas purification device of 1 to 3 ; and

5 a partial section through an exhaust gas purification device according to a second aspect of the invention in the connecting region of the two housing parts.

The 1 to 4 show an exhaust gas purification device 10 according to a first aspect of the invention. The exhaust gas purification device 10 has an outer casing 12 that is a substantially cylindrically shaped first housing part 14 and a second housing part 16 in the form of a funnel. In their mutually facing end areas 18 . 20 are the housing parts 14 and 16 reshaped to each a connecting section 22 respectively. 24 to form, which is perpendicular to the axial direction A of the exhaust gas purification device 10 extends. Such as B. off 3 is apparent, is between the cylindrical housing portion of the first housing part 14 and the connecting portion perpendicular thereto 22 a transitional section 25 provided that includes an angle of 45 ° with both adjacent sections.

Inside the outer housing 12 , in particular in the interior of the first housing part 14 are in axial direction A one behind the other an oxidation catalyst substrate 26 and a particulate filter substrate 28 arranged, wherein the oxidation catalyst substrate 26 with respect to a main flow direction of the exhaust gas upstream of the particulate filter substrate 28 is arranged. The oxidation catalyst substrate 26 is from a storage mat 30 surrounded (see 4 ) and through one of the storage mat 30 applied holding force directly in the first housing part 14 held. The first housing part 14 together with oxidation catalyst substrate 26 is prepared in a per se known calibration, stuffing or winding process. The particle filter substrate 28 that has a certain axial distance from the oxidation catalyst substrate 26 has is over another storage mat 32 in a housing jacket 34 held in the axial direction A almost completely in the first housing part 14 is inserted. Like from the 2 and 4 shows, is the first housing part 14 in the region of the particle filter substrate 28 slightly widened to the particle filter substrate including storage mat 32 and housing jacket 34 take.

The housing jacket 34 rests in the radial direction at its in the 4 left end over a wire mesh ring 35 on the first housing part 14 from. The Indian 4 right end section 36 of the housing jacket 34 which is in the second housing part 16 protrudes, is supported on the second housing part 16 from and is connected to this, in particular Pos. 37 soldered.

For the purpose of cleaning the particulate filter substrate 28 an access to the upstream, the oxidation catalyst substrate 26 facing end face 38 of the particulate filter substrate 28 to enable the end areas 18 . 20 or the connecting sections 22 . 24 the housing parts 14 . 16 in the manufacture of the exhaust gas purification device 10 detachable over several rivets 40 connected with each other. The compound is insofar solvable, as in the production of the exhaust gas purification device 10 used rivets 40 be removed by drilling and the housing parts 14 . 16 or their verb dung sections 22 . 24 then reconnected by ordinary screws (and nuts).

As in particular from the 3 and 4 shows, is the junction of the first housing part 14 with the second housing part 16 in a downstream, from the oxidation catalyst substrate 26 opposite end region 42 of the particulate filter substrate 28 arranged.

To the tightness of the outer casing 12 To ensure that is between the housing parts 14 . 16 a sealing ring 44 made of graphite, which has a substantially triangular cross-section and at the transition section 25 of the first housing part 14 , at the connecting section 24 of the second housing part 16 as well as on the housing jacket 34 is applied.

5 shows an exhaust gas purification device 10 according to a second aspect of the invention, wherein the same or functionally identical components carry the same reference numerals in the following and only to the differences from the previously described exhaust gas purification device 10 will be received.

Instead of rivets are in the exhaust gas purification device 10 of the 5 the end areas 18 . 20 the housing parts 14 . 16 , more precisely their connecting sections 22 . 24 , by self-tapping screws 46 releasably connected together. Preferably, the screws are 46 to flow-hole forming screws, the initial assembly of the emission control device 10 in a single assembly step, the metal of the connecting portions 22 . 24 penetrate, a passage 48 form a metric nut thread and screw the connection sections together. Corresponding bolts are available for example under the trade name FDS ^® by the company EJOT. Alternatively, it may be the screws 46 to handle self-tapping or self-tapping screws. After loosening the screw connections (possibly by drilling the screws 46 ) for the purpose of cleaning the particulate filter substrate 28 let the housing parts 14 . 16 reconnect with ordinary screws.

Alternatively or in addition to the sealing ring 44 is between the connection sections 22 and 24 a flat gasket 50 arranged. Furthermore, it is noticeable that in the embodiment according to 5 the end section 36 of the housing jacket 34 has a slightly enlarged diameter. The particle filter substrate 28 additionally supports itself in the axial direction A via a wire mesh ring 52 on the second housing part 16 from.

Both embodiments of the invention are characterized by low cycle times during manufacture, with multiple screws 46 or rivets 40 can be mounted at the same time. In addition, the preparation of the exhaust gas purification device can be 10 easy to automate.

10

exhaust gas purification device

12

outer casing

14

first housing part

16

second housing part

18

end

20

end

22

connecting portion

24

connecting portion

25

Transition section

26

Oxidation catalyst substrate

28

particulate filter substrate

30

bearing mat

32

bearing mat

34

housing jacket

35

Wire mesh ring

36

end

37

soldered point

38

front

40

rivet

42

end

44

sealing ring

46

screw

48

Draft

50

gasket

52

Wire mesh ring

A

axially

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 10296366 T5 [0002]

Claims (14)

Exhaust gas purification device, in particular for the exhaust system of an internal combustion engine, with an outer housing ( 12 ), the at least a first and a second housing part ( 14 . 16 ), whose mutually facing end regions ( 18 . 20 ) are detachably connected to each other, and one in the outer housing ( 12 ) arranged particulate filter substrate ( 28 ), characterized in that the end regions ( 18 . 20 ) by self-tapping screws ( 46 ) are interconnected. Exhaust gas purification device according to claim 1, characterized in that the screws ( 46 ) is about flow hole forming screws. Exhaust gas purification device according to claim 1, characterized in that the screws ( 46 ) are self-tapping or self-tapping screws. Exhaust gas purification device according to the preamble of claim 1, characterized in that the end regions ( 18 . 20 ) by rivets ( 40 ) are interconnected. Exhaust gas purification device according to one of the preceding claims, characterized in that the housing parts ( 14 . 16 ) in their mutually facing end regions ( 18 . 20 ) are formed to each have a connecting portion ( 22 . 24 ) to build. Exhaust gas purification device according to one of the preceding claims, characterized in that between the housing parts ( 14 . 16 ) a seal, in particular a flat gasket ( 50 ) and / or a sealing ring ( 44 ) made of graphite, is provided. Exhaust gas purification device according to one of the preceding claims, characterized in that the first housing part ( 14 ) is formed substantially cylindrical. Exhaust gas purification device according to one of the preceding claims, characterized in that the second housing part ( 16 ) is designed as a funnel. Exhaust gas purification device according to one of the preceding claims, characterized in that the first and the second housing part ( 14 . 16 ) in an end region ( 42 ) of the particulate filter substrate ( 28 ) are interconnected. Exhaust gas purification device according to one of the preceding claims, characterized in that an oxidation catalyst substrate ( 26 ) provided in the axial direction (A) in front of the particle filter substrate (A) 28 ) in the outer housing ( 12 ) is arranged. Exhaust gas purification device according to claims 9 and 10, characterized in that it is in the end region ( 42 ) around the downstream, the oxidation catalyst substrate ( 26 ) facing away end region. Exhaust gas purification device according to claim 10 or claim 11, characterized in that the oxidation catalyst substrate ( 26 ) directly in the first housing part ( 14 ) is held. Exhaust gas purification device according to one of the preceding claims, characterized in that the particle filter substrate ( 28 ) a housing jacket surrounding it at its circumference ( 34 ), which in the axial direction (A) almost completely in the first housing part ( 14 ) is inserted. Exhaust gas purification device according to claim 13, characterized in that the housing jacket ( 34 ) with the second housing part ( 16 ), in particular soldered.