DE102013107664A1 - line arrangement - Google Patents

Abstract

Line arrangement of an exhaust system for a motor vehicle, the line arrangement comprising: a decoupling element (2), a connectable to the decoupling element (2) pipe element (3) and a connecting element (6), wherein the connecting element (6) in the decoupling element (2) and / / or the pipeline element (3) engages and bridges a connection region which comprises an end region of the decoupling element (2) and an adjoining end region of the pipeline element (3).

Description

The invention relates to a line arrangement of an exhaust system for a motor vehicle with an additional insulation against a radial heat loss of the line arrangement.

As the emission requirements of motor vehicles with internal combustion engines become increasingly stringent, the exhaust gases coming from the engine can be passed, for example, through a separator in order to purify them of microparticles carried in the exhaust gas, such as oil droplets or soot, and / or after-treatment. For example, an afterburner, subjected to further reduce the proportion of pollutants in the exhaust gas. It is advantageous if the exhaust gas supplied to the aftertreatment has the highest possible temperature. Therefore, for example, the exhaust pipe leading elements are externally surrounded with an insulating layer to reduce a radial heat transfer along the pipe elements. The less heat is lost, the better this is for the aftertreatment process.

It is therefore an object of the invention to provide a conduit arrangement for an exhaust system of a motor vehicle, which further reduces a cooling of the exhaust gas flowing through the conduit arrangement.

This object is achieved by the line arrangement according to claim 1. Further embodiments of the invention are the subject of the dependent claims. These can be combined in a technologically meaningful way. The description, in particular in conjunction with the drawing, additionally characterizes and specifies the invention.

One aspect relates to a line arrangement of an exhaust system for a motor vehicle. The line arrangement comprises a decoupling element, a pipe element which can be connected to the decoupling element and a connecting element which engages the connecting element in the decoupling element and / or the pipe element and bridges a connection region which comprises an end region of the decoupling element and an adjoining end region of the pipe element.

The decoupling element may have a multi-part construction with an inner, in particular metallic, winding hose, also called liner, with a metallic bellows and with a protective outer component, such as a braided hose. Between bellows and inner component or outer component results in a space filled with air, resulting in good thermal insulation property.

The piping element, through which hot gases, such as the exhaust gases of an internal combustion engine, can be routed can be surrounded on the outside with an insulating covering.

The connecting element may extend axially into the pipeline element and / or into the decoupling element and in particular help to improve the radial insulation of at least the pipeline element and / or the decoupling element in regions by a radial heat transfer from the interior of the decoupling element and / or the pipeline element externally and subsequently reduced heat loss.

A diameter of the decoupling element at the end in which the connecting element engages may be smaller than, equal to or greater than a diameter of the end of the pipe element into which the connecting element engages. The larger diameter of the decoupling element end can be produced, for example, by a terminal widening of the decoupling element, which, however, can lead to damage of the liner due to, for example, excessive material stress, and is advantageously avoided.

The connecting element may be arranged in the engagement region with the decoupling element and / or pipe element coaxially in the decoupling element and / or the pipe element. Between an inner wall of the decoupling element and / or the pipe element and the connecting element, a gap may be formed at least in sections. The gap may be filled with air, wherein such an air gap forms an insulating layer, which can reduce the heat transfer from the interior of the decoupling element and / or the pipe element to the outside.

When the radial heat loss within the decoupling element and / or the piping element is reduced, a temperature of the fluid flowing through the piping element and decoupling element in the axial direction changes less than would be the case without the additional radial isolation through the connecting element, that is, the exhaust gas cools down less quickly. This may be advantageous, in particular, for exhaust aftertreatment, since with a higher exhaust gas temperature in the after-treatment, more pollutants can be removed from the exhaust gas than with an exhaust gas having a lower exhaust gas temperature.

The connecting element may comprise or form at least one spacer or a radial positioning element. The spacer may abut an inner wall of the decoupling element and / or the pipe element and / or position the connecting element radially in the decoupling element and / or the pipe element, and / or may determine a width of the above-mentioned gap.

In this case, the spacer may extend over the entire circumference of the connecting element, or there may be a plurality of spacers which are distributed in the circumferential direction around the connecting element to the connecting element in the decoupling element and / or pipe element, respectively, a leading hot exhaust gas passage in the decoupling element and / or pipe element to center.

The spacer or spacers may be formed by deformation, by clinching, by embossing or other method of the connecting element itself. Alternatively, the spacer may be a separate part, e.g. As a wire press ring, which is connected to the connecting element or connectable.

As in the following, all the techniques familiar to the person skilled in the art, such as frictional connection, positive connection and / or material connection, are suitable for the connection here and, if appropriate, also in combination.

The connecting element may be, for example, a thin-walled tube which has an approximately constant diameter or regions of different diameters over its axial extent. In the latter case, an area with a larger diameter can form the spacer, while a region with a smaller diameter or the inside of the tube can form a passage for the hot exhaust gas in the decoupling element and / or the pipeline element.

The spacer or spacers may abut against the inner wall of the piping member or the passage of the Entkoppelungselements without being connected thereto. If the connecting element is already preassembled with the pipe element, the connecting element in the region of at least one of the spacers may be materially connected, for example, by spot welding from outside through a wall of the pipe element.

The connector may further include at least one axial positioning member for axially positioning the connector in the conduit assembly. The axial positioning element can abut the pipe element and / or the decoupling element relative to the line arrangement for axial positioning of the connecting element or can be connected to the pipe element and / or the decoupling element, for example in a form-fitting or materially bonded manner.

The connecting element may, for example, have a joining nose, which projects outwardly through an axial gap or opening between the decoupling element and the pipeline element, wherein the joining nose can be clamped between the opposite ends of the decoupling element and the pipeline element and / or with one end of the decoupling element and / or one end of the pipe element can be connected, in particular cohesively, for example by a punctiform or linear weld. The joining nose can form the axial positioning element and / or the radial positioning element.

If the decoupling element has a liner, that is to say an inner component in the form of a winding tube, the liner, with a corresponding axial extent, can form the connecting element which extends into the pipeline element.

The liner may be radially compressed in the region of the engagement in the pipeline element or joined with an additional engagement element. Additionally, alternatively, the liner may have corrugations or edges, or it may have a wire crimp or flare at an end remote from the decoupler. In this case, the beads, edges and / or the wire pressing ring and / or the expansion can form the spacer or spacers which keep the liner at a distance to an inner wall of the pipe element to form the insulation gap, the radial heat transfer in the pipe element in the region Liners reduced.

The pipe element may in particular be a rigid pipe element.

A further aspect relates to a connecting element for connecting a flexible hose line element to a rigid pipe element, wherein the connecting element engages in the flexible hose line element and in the rigid pipe element and can be materially connected to at least one of the line elements.

The connecting element may in particular be the connecting element described on the preceding pages.

Yet another aspect of the invention relates to a decoupling element of an exhaust system of a motor vehicle, wherein the decoupling element has a liner (winding tube as inner component), which protrudes at least one end of the decoupling element from the decoupling element, that is, from the outer bellows / corrugated tube.

The liner may be radially compressible at the portion protruding from the decoupling element, or it may have beads or edges or at its end remote from the decoupling element comprise a wire ferrule or widening at a distance to the liner after assembly of the above-described conduit assembly an inner surface of the pipe member to be connected holds, so that between the inner surface of the pipe member and the liner, a gap is formed, which reduces a radial heat input to a pipe member outside in the engagement region of the liner into the pipe member.

For the entire description and claims, the term "a" is used as an indefinite article and the number of parts is not limited to a single one. Should "a" have the meaning of "only one", then this will be understood by those skilled in the context or by the use of suitable terms such. For example, "a single" is unambiguously disclosed.

In the following, several embodiments of the line arrangement will be explained in more detail with reference to figures, without restricting the invention to the examples shown. Technical, essential to the invention features that can be found only in the figures are within the scope of the invention and can further develop the invention alone or in the combination shown advantageous.

1 shows a first embodiment of a conduit arrangement with connecting element;

2 shows a second embodiment of a conduit arrangement with connecting element with centering on the entire circumference;

3 shows the line arrangement of 2 with partial centering;

4 shows the line arrangement of 2 with clinched spacer and centering on the connecting element;

5 shows the power arrangement of 2 with centering by widening one end of the connecting element;

6 shows a third embodiment with liner extension;

7 shows four variants for fixing / positioning of the extending into the pipe element liner end; and

8th shows a fixation of the liner to the decoupling element.

The 1 shows a first embodiment of a conduit arrangement according to the invention 1 with a decoupling element 2 comprising a bellows 2a with a substantially smooth connection end 2aa which bellows 2a from a braided hose 2 B surrounded and with a liner 4 is lined. Furthermore, the arrangement comprises a rigid pipe element 3 , The decoupling element 2 indicates at its the pipe element 3 one end facing the decoupling element 2 non-positively and / or cohesively connected sleeve 5 on, the opening diameter of the decoupling element 2 determined at this end and for connecting liners 4 and braid 2 B to the bellows 2a serves, for. B. by welding or pressing.

The line arrangement 1 also has a connecting element 6 on, which is a substantially smooth-cylindrical, thin-walled piece of pipe in the embodiment shown, on the one hand in the decoupling element 2 and on the other hand into the piping element 3 reaches in and between the liner 4 or an inner wall 3a of the pipe element 3 a gap 7 the width b forms. The gap 7 is filled with air or exhaust gas and forms an insulating layer, the radial heat transfer in the arrow direction of a passage 8th reduced to the outside.

The connecting element 6 has an axial positioning element 6a and two radial positioning elements 6b on. The axial positioning element 6a is located on a decoupling element 2 facing the end of the pipe element 3 and sets the position of the connector 6 in the longitudinal direction of the pipe element 3 firmly. In this case, the connecting element 6 over the linear position element 6a with the pipe element 6 be connected, for example, cohesively connected.

The radial positioning elements 6b center the connector 6 in the pipeline element 3 and thereby determine the width b of the gap 7 , In the embodiment shown, the positioning elements 6a . 6b separate parts connected to the connecting element 6 are connected cohesively.

The positioning elements 6a . 6b may be ring elements that extend around the entire circumference of the connecting element 6 or alternatively, for example, narrow strips in the axial direction that extend beyond the circumference of the connecting element 6 are arranged distributed. An embodiment as a punching tabs is possible.

2 shows a further embodiment of the conduit arrangement 1 with a decoupling element 2 , a pipe element 3 and a connecting element 6 , When the connecting element 6 The embodiment shown is a modulated, thin tube with two modulated radial positioning sections 6b , a modulated linear positioning section 6a and a joining nose 9 wherein said modulated portions are realized via cross-sectional changes of the tube.

In the embodiment of 2 grips the pipeline element 3 not - as in 1 - in the decoupling element 2 a, but the opposite ends, respectively end faces of the pipe element 3 and the decoupling element 2 are axially spaced apart by a gap S. The joint nose 9 is through the gap S from the line arrangement 1 outward and can, for example, cohesively with the pipe element 3 and / or with the decoupling element 2 connected and thereby relative to the line arrangement 1 be set axially and radially. At the same time, through the sections 6b in which the liner 4 or the pipe 3 outside on the connecting element 6 abut, the gap 7 between the inner wall 3a of the pipe element 3 and the liner 4 and the passage 8th formed for passing the hot exhaust gas, which has a radially effective isolation in the pipe element 3 and in the decoupling element 2 forms. A possible disadvantageous terminal widening of the decoupling element 2 is - unlike in 1 - not mandatory.

In the 3 is essentially the same line arrangement 1 like in the 2 shown. Only the connecting element 6 has an additional radial positioning element 6b ' on, which consists of several on the perimeter of the connecting element 6 distributed nubs or a rotating shaft is formed. The nubs and / or the shaft can - as already mentioned - by punching and / or embossing or by other deformation of the connecting element 6 be shaped.

The additional radial positioning element 6b ' which is the connecting element 6 radially in the decoupling element 2 determines and the width of the gap 7 in the decoupling element 2 determined, can, as from the 2 known, circumferentially on the connecting element 6 arranged or alternatively be formed by a plurality of corresponding characteristics on the periphery. In this case, the connecting element 6 in the region of the circumferential or formed by several forms radial positioning element / s 6b . 6b ' be pressed in the liner assembly.

The 4 shows a further embodiment in which the connecting element 6 clinched radial positioning elements 6b having the connecting element 6 in the pipeline element 6 center and the gap 7 form a radial heat transfer from the passage 8th outwards in the direction of the arrow (cf. 3 ) reduced.

The 5 shows a further embodiment in which the connecting element 6 at the of the decoupling element 2 distant end towards the inner wall 3a of the pipe element 3 is bent and thereby a radial positioning element 6b formed. This is the gap 7 between the radial positioning element 6b in the pipeline element 3 and the linear position element 6a at least substantially closed, so that an exchange of the in the gap 7 trapped air can only be done very slowly.

The 6 shows an embodiment of a conduit arrangement 1 in which the line arrangement 1 has a connecting element that through the liner 4 of the decoupling element 2 is formed. The liner 4 is in the direction of the pipe element 3 from the decoupling element 2 in front and is at his the pipeline element 3 facing end over the sleeve 5 with the remaining decoupling element 2 pressed. The sleeve 5 simultaneously forms an engagement element, which in the exemplary embodiment in the pipe element 3 pushed in and there preferably cohesively or mechanically fixed.

In this embodiment, the insulating column 7 with width b only in the pipe element 3 formed while the decoupling element 2 in addition to the liner 4 no additional insulating gap 7 having.

The 7 shows the line arrangement 1 of the 6 with four differently shaped, located in the pipe element 3 in extending fasteners passing through the liner 4 be formed, the liner 4 :
in the 7a which are essentially the 6 corresponds, radially compressed, to the liner 4 in the compressed area 4a to stiffen, so the liner 4 at a fixed distance substantially parallel to the inner wall 3a of the pipe element 3 runs and the gap 7 forms;
in the 7b the liner 4 for stiffening axial beads or edges 4b having the beads or edges 4b also to the inner wall 3a of the pipe element 3 extend and radial positioning elements to form the gap 7 can train;
in the 7c the liner 4 one with the liner 4 joined, terminal wire press ring 10 that has the liner 4 on whose the decoupling element 2 opposite end at a distance to the inner wall 3a of the pipe element 3 stops, causing the gap 7 is trained; and
in the 7d at the of the decoupling element 2 opposite end an expansion 4d having the width of the insulating gap 7 certainly.

8th shows a variant for attaching the liner 4 on the remaining decoupling element 2 , The liner 4 is over a connecting sleeve 11 , which serves as a fixing element, with the decoupling element 2 connected, wherein the connecting sleeve 11 a stepped, respectively z-shaped annular sleeve, which is the decoupling element 2 facing the end of the pipe element 3 encompasses and with the liner 4 cohesively connectable.

The liner 4 can in the area of the pipeline 3 according to the 7a to 7b be educated.

Although some possible embodiments of the invention have been disclosed in the foregoing description, it is to be understood that numerous other variants of embodiments exist through the possibility of combining all of the cited and further all of the obvious technical features and embodiments. It is further understood that the embodiments are to be understood as examples only, which in no way limit the scope, applicability and configuration. Rather, the foregoing description would suggest a suitable way for the skilled person to realize at least one exemplary embodiment. It should be understood that in an exemplary embodiment, numerous changes in the function and arrangement of the elements may be made without departing from the scope and equivalents disclosed in the claims.

LIST OF REFERENCE NUMBERS

1

line arrangement

2

decoupling element

2a

bellows

2aa

terminal end

2 B

Geflechtschlauch

3

Tubing member

3a

Inner surface of piping element

4

liner

4a

compressed end

4b

Beading, edge

4c

widening

5

shell

6

connecting element

6a

axial position element

6b

radial position element

6b '

radial position element

7

gap

8th

by line

9

nose

10

Wire press ring

11

connecting sleeve

S

gap

b

Gap width, width

Claims (16)

Line arrangement of an exhaust system for a motor vehicle, the line arrangement ( 1 ) comprising: a) a decoupling element ( 2 ), b) a to the decoupling element ( 2 ) connectable pipeline element ( 3 ) and c) a connecting element ( 6 ), d) wherein the connecting element ( 6 ) in the decoupling element ( 2 ) and / or the pipeline element ( 3 ) and a connection region, which forms an end region of the decoupling element ( 2 ) and an adjoining end region of the pipeline element ( 3 ), bridged. A conduit arrangement according to claim 1, wherein the connecting element ( 6 ) coaxially in the decoupling element ( 2 ) and / or the pipeline element ( 3 ) and between an inner wall ( 3a ) of the decoupling element ( 2 ) and / or the pipe element ( 3 ) and the connecting element ( 6 ) at least in sections a gap ( 7 ) is formed. A conduit arrangement according to claim 2, wherein the connecting element ( 6 ) at least one radial positioning element ( 6b ; 10 ) formed on the inner wall ( 3a ) of the decoupling element ( 2 ) and / or the pipe element ( 3 ) and / or the connecting element ( 6 ) radially in the decoupling element ( 2 ) and / or the pipeline element ( 3 ) and / or a width (b) of the gap ( 7 ) certainly. A conduit arrangement according to claim 3, wherein the radial positioning element ( 6b ; 10 ) by deformation, clinching, embossing of the connecting element ( 6 ) is formed or wherein the radial positioning element ( 6b ; 10 ) is a separate part connected to the connecting element ( 6 ) is connected or connectable, preferably positive and / or non-positive. A conduit arrangement according to any one of claims 1 to 4, wherein the connecting element ( 6 ) at least one axial positioning element ( 6a ) having. A conduit arrangement according to any one of claims 1 to 5, wherein the connecting element ( 6 ) a joining nose ( 9 ), which by an axial gap (S) between the decoupling element ( 2 ) and the pipeline element ( 3 ) protrudes outward and with one end of the decoupling element ( 2 ) and / or one end of the pipeline element ( 3 ) is available or joined. A conduit arrangement according to claim 6, wherein the joining nose ( 9 ) the axial positioning element ( 6a ) forms according to claim 5 with. A conduit arrangement according to any one of claims 1 to 7, wherein the connecting element ( 6 ) is a separate sleeve, which in the decoupling element ( 2 ) and / or the pipeline element ( 3 ) plugged or plugged in and with the decoupling element ( 2 ) and / or the pipeline element ( 3 ) is connectable or connected, preferably cohesively or non-positively. A conduit arrangement according to any one of claims 1 to 7, wherein the decoupling element ( 2 ) a liner ( 4 ) and the liner ( 4 ) forms the connecting element that extends into the pipeline element ( 3 ). A conduit arrangement according to claim 9, wherein the liner ( 4 ) in engagement with the pipeline element ( 3 ) is pressed radially or beads or edges ( 4b ) or at its the decoupling element ( 2 ) far end of a spacer element, in particular a wire press ring ( 10 ), or an expansion ( 4c ) having. A conduit arrangement according to any one of claims 1 to 10, wherein the decoupling element ( 2 ) on a pipe element ( 3 ) facing end with or without sleeve ( 5 ) and / or with a fixing element ( 11 ) is added. A conduit arrangement according to one of claims 1 to 11, wherein the pipeline element ( 3 ) a rigid pipe element ( 3 ). Connecting element ( 6 ) for connecting a flexible hose line element ( 2 ) with a rigid pipe element ( 3 ), wherein the connecting element ( 6 ) in the flexible hose line element ( 2 ) and into the rigid pipeline element ( 3 ) and with at least one of the line elements ( 2 . 3 ) is cohesively and / or non-positively connectable. Connecting element according to claim 13, wherein the connecting element ( 6 ) the connecting element ( 6 ) according to one of claims 1 to 8. Decoupling element ( 2 ) for an exhaust system of a motor vehicle, wherein the decoupling element ( 2 ) a radially outer corrugated tube or bellows ( 2a ) and a radially inner liner ( 4 ), which at at least one front end of the decoupling element ( 2 ) from the corrugated hose or bellows ( 2a ) stands out. Decoupling element ( 2 ) according to claim 15, wherein the liner ( 4 ) on the from the corrugated tube or bellows ( 2a ) protruding section beading or edges ( 4b ) or at its the decoupling element ( 2 ) far end of a spacer element, in particular a wire press ring ( 10 ), or an expansion ( 4c ) and / or on a decoupling element ( 2 ) far end radially compressible or with a fixing element ( 11 ) is added.

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