DE102013217526A1 - Sealing device with an extension for guiding an exhaust gas flow of an internal combustion engine - Google Patents

Abstract

The invention relates to a sealing device (3) for sealing an exhaust gas guide (5) for guiding an exhaust gas stream (7) of an internal combustion engine (9), with at least one sealing layer (15) which can be arranged between two sealing surfaces (11, 13) of the exhaust gas guide (5). In order to maximize an enthalpy of the exhaust gas flow (7), it is provided that the sealing layer (15) has an extension (19) along which the exhaust gas stream (7) can be guided or a support layer (17) is provided which has an extension (17). 21), along the exhaust gas stream (7) is feasible.

Description

The invention relates to a sealing device for sealing an exhaust gas duct for guiding an exhaust gas stream of an internal combustion engine, with at least one sealing layer which can be arranged between two sealing surfaces of the exhaust gas duct, an exhaust gas duct for guiding an exhaust gas stream of an internal combustion engine, with a fluid path for guiding the exhaust gas stream, a further downstream of the fluid path Fluid path and a the sealing device and / or the exhaust system exhibiting motor vehicle.

The sealing of exhaust ducts for guiding an exhaust gas flow of an internal combustion engine is known. Such exhaust ducts may have different components, in particular a cylinder head and an exhaust manifold. It is known to arrange at least one sealing layer in a sealing plane. The sealing layer may in particular comprise a metallic material. Furthermore, it is known to reduce a heat transfer between the exhaust stream and the exhaust system by constructive measures. This can be done for example by the provision of an air gap between components of the exhaust system and the feasible exhaust gas flow. In addition, it is known to minimize the heat losses flow paths along cooled sections of the exhaust system as short as possible.

The DE 102 31 378 A1 relates to a cylinder head of an internal combustion engine having an exhaust passage, a cylinder head floor, a cylinder head roof, an outlet side mounting surface and an exhaust manifold bolted thereto, wherein a sealing surface at the end of the exhaust passage, seen in the flow direction, is arranged in front of the mounting surface.

From a publication "Air gap insulated exhaust manifold for a turbocharged in-line six-cylinder gasoline engine", MTZ, 12/2009, year 70, pages 916-920 , an air gap insulated exhaust manifold is known, comprising an outer shell and an exhaust passage forming inner shell, wherein between the shells an air gap for isolating the exhaust gas flow remains. The exhaust manifold is welded downstream with an exhaust gas turbocharger.

The object of the invention is to provide a structurally simple way to maximize an enthalpy of an exhaust gas flow of an internal combustion engine.

The object is achieved with the features of the independent claims.

The object is achieved in a sealing device for sealing an exhaust gas system for guiding an exhaust gas stream of an internal combustion engine, with at least one arranged between two sealing surfaces of the exhaust gas guide or arrangeable sealing layer characterized in that the sealing layer has an extension along which the exhaust gas flow is feasible or that an additional support layer is provided, which has an extension along which the exhaust gas flow is feasible. Advantageously, the exhaust gas flow can be guided along the extension of the sealing layer. The extension can advantageously simultaneously act to guide the exhaust stream and as thermal insulation. In particular, the extension as a heat shield can minimize heat loss of the exhaust stream by radiant heat. Advantageously, this can maximize the enthalpy contained in the exhaust gas flow downstream of the sealing device. Advantageously, an enthalpy of enthalpy into an aggregate downstream of the sealing device can thereby be maximized. The downstream unit may be, for example, an exhaust gas turbine, which can deliver a higher mechanical power due to the maximized enthalpy. Alternatively or additionally, the downstream unit may be an exhaust gas purification device which responds more quickly due to the maximized enthalpy, in particular reaches a light-off temperature more quickly. Advantageously, thereby an exhaust gas purification of the exhaust gas stream and / or a power of the internal combustion engine can be improved.

In the following, if appropriate, the sealing layer and the supporting layer are referred to as layers.

In one embodiment of the sealing device is provided that the extension is arranged at an angle to the sealing layer or supporting layer. Advantageously, the extension connects directly in the angle to the sealing position. Advantageously, this can be implemented constructively in a simple manner. In addition, it can be achieved that the exhaust gas flow can be guided substantially in a longitudinal direction of the extension along this. In particular, the exhaust gas flow can thereby be guided at the angle to the sealing layer. In particular, the angle may be about 90 °.

In a further embodiment of the sealing device is provided that the sealing layer or support layer are annular and the extension is tubular. By means of the annular sealing layer, the exhaust gas guide can be sealed fluid-tight, wherein the exhaust gas flow through the tubular extension can be passed. Advantageously, the tubular extension of the Shield exhaust gas flow against a fluid path of the exhaust system. In particular, an insulating air gap remains between the tubular extension and the fluid path. In particular, the annular sealing layer and the tubular extension form a collar sleeve, wherein a collar forms the sealing layer and a tube or sleeve adjoining the collar forms the extension. The sealing layer or the supporting layer and the extension are advantageously carried out in particular in one piece. Advantageously, this results in a particularly simple construction of the sealing device, which assumes the function of sealing the exhaust gas guide and the thermal insulation of the exhaust gas flow in only one component. In particular collar sleeves are advantageous comparatively easy to produce. In addition, it is advantageously ensured that the sealing plane, in which the sealing layer is arranged, is unchanged in comparison to conventional constructions. Advantageously, the sealing layer, in particular the collar of the collar sleeve can be mounted in a conventional manner with the rest of the exhaust system, wherein advantageously only the extension projects into the exhaust system and possibly the exhaust gas flow leads and thermally insulated.

Advantageously, a two-ply sealing device can be realized.

In a further embodiment of the sealing device is provided that the sealing layers are arranged adjacent to each other, wherein extensions extend from the sealing layers in opposite directions. Advantageously, the exhaust gas flow both upstream and downstream of the sealing device may be guided by means of the two extensions and thermally insulated from the cylinder head and exhaust manifold. In particular, the extension of the sealing layer extends counter to a flow direction of the exhaust gas guide and the further extension of the support layer along the flow direction of the exhaust system, or vice versa.

The object is also achieved in an exhaust system for guiding an exhaust gas flow of an internal combustion engine, having a fluid path for guiding the exhaust gas flow and a further fluid path arranged downstream of the fluid path through a previously described sealing device, by means of which the fluid paths are sealed against an outside area. Advantageously, the exhaust gas flow can be guided along the extension, wherein this can be isolated at the same time against the rest of the exhaust system. Incidentally, the advantages described above arise.

In one exemplary embodiment of the exhaust system, it is provided that the extension of the sealing layer projects into one of the fluid paths. Advantageously, the exhaust gas flow can be thermally isolated by the extension against the corresponding fluid path.

In a further exemplary embodiment of the exhaust gas guide, it is provided that the extension of the sealing layer into the fluid path and the further extension of the further sealing layer protrude into the further fluid path. Advantageously, both fluid paths can be thermally isolated by means of the extensions downstream and upstream of the sealing device.

In a further exemplary embodiment of the exhaust gas guide, it is provided that the extension is arranged between an inner wall of one of the fluid paths and the feasible exhaust gas flow. Advantageously, the exhaust gas flow can be thermally insulated against the inner wall. In particular, an air gap remains between the inner wall and a side of the extension facing away from the exhaust gas flow. Advantageously, by means of the air gap, the thermal insulation of the exhaust gas flow against the inner wall.

The object is also achieved by a motor vehicle with a previously described sealing device and / or a previously described exhaust system. This results in the advantages described above.

Further advantages, features and details will become apparent from the following description in which - where appropriate, with reference to the drawings - at least one embodiment is described in detail. Described and / or illustrated features may form the subject of the invention itself or in any meaningful combination, optionally also independent of the claims, and in particular may also be the subject of one or more separate application / s. The same, similar and / or functionally identical parts are provided with the same reference numerals.

Show it:

1 a schematic view of an exhaust system of an internal combustion engine to illustrate an environment of the invention; and

2 a longitudinal section through a gas turbine having a sealing device for guiding an exhaust gas flow of an internal combustion engine.

1 shows a schematic view of an internal combustion engine 9 of a motor vehicle 1 , The internal combustion engine 9 of the motor vehicle 1 has an exhaust system 5 for guiding an exhaust gas flow 7 of the motor vehicle 1 on. The internal combustion engine 9 has a cylinder head 39 and a downstream of this exhaust manifold 41 on. The cylinder head 39 and the exhaust manifold 41 form part of the exhaust system 5 and are by means of a sealing device, not shown 3 sealed against each other. The exhaust manifold 41 is an aggregate 37 of the motor vehicle 1 downstream. At the aggregate 37 it is in particular an exhaust gas turbine and / or an exhaust gas purification device for purifying the exhaust gas flow 7 ,

2 shows a longitudinal section of in 1 shown exhaust system 5 of in 1 shown internal combustion engine 9 ,

In 2 it can be seen that the cylinder head 39 of the internal combustion engine 9 a first sealing surface 11 and the exhaust manifold 41 an adjacent to this arranged further sealing surface 13 exhibit. The sealing surfaces 11 and 13 are by means of the sealing device 3 sealed against each other. Corresponding sealing forces can be applied by a flange, not shown. For sealing, the sealing device 3 a sealing layer 15 on. Optional is a support layer 17 intended. In particular, in addition to the layers 15 and 17 provided additional sealing layers. In particular, it is in the sealing device 3 around a multilayer sealing device. The layers 15 . 17 are made in particular of a metallic material and are annular.

Advantageously, the sealing surface 11 an extension 19 on. The extension 19 extends in one direction 25 in a fluid path 29 , The fluid path 29 is through the cylinder head 39 of the internal combustion engine 9 educated. Along the extension 19 can be against the direction 25 the exhaust gas flow 7 be guided. It can be seen that beneficial between the extension 19 and an inner wall 33 of the fluid path 29 of the cylinder head 39 an air gap 43 remains. The air gap 43 remains between a feasible exhaust stream 7 opposite side of the extension 19 the sealing position 15 and the inner wall 33 of the cylinder head 39 of the internal combustion engine 9 , Advantageously, through the air gap 43 a thermal insulation of the exhaust stream 7 against the cylinder head 39 respectively. In 2 It can also be seen that the inner wall 33 adjacent to a water cooling 45 of the internal combustion engine 9 is arranged. Advantageously, by means of the air gap 43 or the extension 19 the sealing position 15 a heat transfer from the exhaust stream 7 into a cooling water of water cooling 46 be minimized. In particular, a heat transfer by radiation of the exhaust gas flow can be advantageous 7 be minimized. Optionally occurring heat flows by convection or an afterflow of the air gap 43 through the exhaust gas flow 7 are advantageous over that without the advantageous air gap 43 occurring radiation heat transfer negligible.

The extension / s 19 and or 21 can / can each at one of the layers 15 and or 17 opposite end an expansion 47 have, which prevents the backflow or at least minimized.

In one of the direction 25 opposite direction 27 extends another extension 21 the situation 17 in another fluid path 31 the exhaust system 5 , The further fluid path 31 is through the exhaust manifold 41 educated. The further area 13 and the further extension 21 are analogous to the sealing position 15 and the extension 19 educated. In particular, the sealing surfaces 11 . 13 as a covenant and the extensions 19 . 21 formed as sleeves each a collar sleeve. It can be seen that by the configuration of the layers 15 . 17 and their extensions 19 . 21 a sealing plane of the sealing device 3 does not need to be changed, but advantageous in each case the air gap 43 for thermally insulating the exhaust stream 7 is representable. The isolation of the exhaust gas flow 7 So can without constructive change of the cylinder head 39 and the exhaust manifold 41 will be realized. The only design measures are the extensions 19 and 21 at the locations 15 and 17 required. These extend in opposite directions 25 and 27 , in particular in the flow direction of the exhaust gas flow 7 and in one of these opposite directions. Advantageously, thereby the exhaust gas flow upstream and downstream of the sealing device 3 thermally against the inner wall 33 of the cylinder head 39 and another interior wall 35 the exhaust manifold 41 be isolated.

The sealing position 15 and / or the support layer 17 are each at an angle 23 to the extension 19 and / or further extension 21 arranged. In particular, the angle is 23 90 °, in particular about 90 °, in particular between 85 ° and 95 °. In particular, the sealing plane of the sealing device 3 perpendicular to the flow direction of the exhaust gas flow 7 , ie perpendicular to the direction 25 and the other direction 27 arranged.

The sealing device 3 , in particular as an exhaust manifold gasket between the cylinder head 39 and the exhaust manifold 41 is executed, is designed in particular as a multilayer metal gasket. According to the invention, the layers 15 . 17 by means of extensions 19 . 21 in the fluid path 29 and / or the further fluid path 31 extended. The sealing layers 15 provide the actual sealing layers the sealing device 3 This results in advantageous between the extensions 19 . 21 and the inner wall 33 of the cylinder head 39 and / or the other inner wall 35 the exhaust manifold 41 in each case the air gap 43 , This air gap 43 has an advantageous insulating effect, resulting in higher temperatures of the exhaust gas flow 7 downstream of the sealing device 3 causes.

The sealing device 3 , which is designed in particular as an exhaust manifold gasket, advantageously takes over the task of thermal insulation of the fluid paths in addition to the sealing effect 29 and or 31 ,

In particular, the layers are advantageous 15 and or 17 as well as the extensions 19 and or 21 as a continuous component, in particular integrally formed. Advantageously, this results in an easily assembled sealing device 3 In particular, compared to previously known sealing devices no additional components and / or structural changes to the cylinder head 39 and the exhaust manifold 41 required are. Advantageously can be dispensed with an air gap insulated manifold.

Advantageously, an entrance enthalpy of the exhaust gas flow 7 in the downstream unit 37 increase. In particular, thereby a mechanical performance of an exhaust gas turbine and / or a reaching a light-off temperature of an exhaust gas purification device, in particular a catalyst can be improved.

Advantageously, a commercially available sealing device 3 through the extensions 19 and or 21 be easily supplemented, with the extensions 19 . 21 into the fluid paths 29 and or 31 protrude and the beneficial air gap 43 cause. Advantageously, the sealing plane of the sealing device 3 remain unchanged.

Advantageously, the air gap 43 a shield of heat radiation of the exhaust stream 7 on the comparatively cold inner wall 33 and / or further interior wall 35 the particular water-cooled cylinder head 39 and / or the exhaust manifold 41 , in particular, the exhaust gas flow 7 a temperature of about 850 ° C on. Advantageously, a comparatively high degree of the air gap 43 be tolerated because a heat transfer from the exhaust stream 7 in the cylinder head 39 and / or the exhaust manifold 41 convection plays a comparatively minor role in heat transfer by radiation.

LIST OF REFERENCE NUMBERS

1

motor vehicle

3

sealing device

5

exhaust system

7

exhaust gas flow

9

internal combustion engine

11

first sealing surface

13

additional sealing surface

15

sealing layer

17

support layer

19

renewal

21

further extension

23

angle

25

direction

27

further direction

29

fluid path

31

further fluid path

33

inner wall

35

another inner wall

37

aggregate

39

cylinder head

41

exhaust manifold

43

air gap

45

water cooling

47

widening

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10231378 A1 [0003]

Cited non-patent literature

• "Air gap insulated exhaust manifold for a turbocharged inline six-cylinder gasoline engine", MTZ, 12/2009, Volume 70, pages 916-920 [0004]

Claims (10)

Sealing device ( 3 ) an exhaust system ( 5 ) of an internal combustion engine ( 9 ), with at least one between two sealing surfaces ( 11 . 13 ) of the exhaust system ( 5 ) arranged or arrangeable sealing layer ( 15 ), characterized in that the sealing layer ( 15 ) an extension ( 19 ), along which an exhaust gas stream ( 7 ) is feasible and / or that an additional support layer ( 17 ) between the sealing surfaces ( 11 . 13 ), which is an extension ( 21 ), along which an exhaust gas stream ( 7 ) is feasible. Sealing device ( 3 ) according to the preceding claim, characterized in that the extension ( 19 ) or extension ( 21 ) at an angle ( 23 ) to the sealing layer ( 15 ) is arranged. Sealing device ( 3 ) according to one of the preceding claims, characterized in that the sealing layer ( 15 ) annular and the extension ( 19 ) are tubular. Sealing device ( 3 ) according to one of the preceding claims, characterized in that the supporting layer ( 17 ) annular and the extension ( 21 ) are tubular. Sealing device ( 3 ) according to one of the preceding claims, characterized in that the layers ( 15 . 17 ) are arranged adjacent to each other, wherein the extensions ( 19 . 21 ) starting from the layers ( 15 . 17 ) in opposite directions ( 25 . 27 ). Exhaust system ( 5 ) for guiding an exhaust gas flow ( 7 ) of an internal combustion engine ( 9 ), comprising: - a fluid path ( 29 ) for guiding the exhaust gas flow ( 7 ), - one downstream of the fluid path ( 29 ) arranged further fluid path ( 31 ), characterized by a sealing device ( 3 ) according to one of the preceding claims, by means of which the fluid paths ( 29 . 31 ) are sealed against an outdoor area. Exhaust system ( 5 ) according to claim 6, characterized in that the extension ( 19 ) the sealing layer ( 15 ) into one of the fluid paths ( 29 . 31 ) protrudes. Exhaust system ( 5 ) according to one of claims 6 or 7, characterized in that the extension ( 19 ) the sealing layer ( 15 ) in the fluid path ( 29 ) and the extension ( 21 ) of the supporting layer ( 17 ) in the further fluid path ( 31 protrude). Exhaust system ( 5 ) according to one of claims 6 to 8, characterized in that the extension ( 19 ) between an inner wall ( 33 ) one of the fluid paths ( 29 . 31 ) and the feasible exhaust gas flow ( 7 ) is arranged. Motor vehicle ( 1 ) with a sealing device ( 3 ) according to one of claims 1 to 5 and / or an exhaust system ( 5 ) according to one of claims 6 to 9.

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