WO2012104069A1

WO2012104069A1 - Decoupling element, in particular for exhaust systems

Info

Publication number: WO2012104069A1
Application number: PCT/EP2012/000434
Authority: WO
Inventors: Immo GÄRTNER; Holger Hebisch
Original assignee: Boa Balg- Und Kompensatoren-Technologie Gmbh
Priority date: 2011-02-04
Filing date: 2012-02-01
Publication date: 2012-08-09
Also published as: DE102011010332B4; DE102011010332A1

Abstract

Proposed is a decoupling element, in particular for exhaust lines of internal combustion engines in motor vehicles, having a bellows and having a heat insulation material, wherein the heat insulation material is formed by annular segments or the heat insulation material is formed by a helically wound strip with segments formed by individual windings. Here, the segments overlap in the direction of the axis of the bellows.

Description

Decoupling element, in particular for exhaust systems

The invention relates to decoupling element, in particular for exhaust pipes of internal combustion engines in motor vehicles, with a bellows and a heat insulation.

Decoupling elements are installed as intermediate pieces in exhaust ^¬ lines of motor vehicles to largely decouple movements and vibrations. To this end the decoupling ^¬ element has a movable bellows made of metal, which has a strip wound hose for the purpose of exhaust gas guidance and protection of the bellows in the interior.

In modern exhaust systems, an after-treatment of the exhaust gases is increasingly necessary, such as. e.g. through soot particle filter. For such devices to work beneficially, the

Exhaust gases have high temperatures. On the one hand to ensure a minimal heat loss from the motor output to the filter input and on the other hand to thermally isolate the sensitive bellows against the hot exhaust fluid, more or less elastic mats are integrated in different radial layers within the decoupling element for insulation. Such a thermal insulation material is known from DE 10 2007 043 944 AI, in which a flexible conduit element with combined heat insulating material and vibration damping is described.

Between a flexible inner part leading to the exhaust gases and a flexible, gas-tight jacket part, a layer made up of a plurality of layers with the shape of a hollow cylinder is arranged.

CONFIRMATION COPY Disadvantage of this and similar types are for a re-induced ^¬ flexibilities of the decoupling element, and on the other a short life of the insulation layer, since this does not have the flexibility of the decoupling element and is heavily burdened by continuous oscillations of the exhaust system. The materials used for insulation must absorb large strains due to their hollow cylindrical shape when the tube absorbs movement. This additionally limits the selection of materials, especially for heat-resistant materials, a strong.

It is therefore an object of this invention to provide a decoupling ^¬ element whose mobility is not limited despite thermal insulation.

According to the invention this object is achieved with a decoupling element of the type mentioned above, which is characterized in that the heat insulation is formed by heat insulating material in the form of a helically wound band formed by individual convolutions segments, and that the segments overlap in the direction of the axis of the bellows ,

From the configuration of the thermal insulation as a heat insulating material it follows that the thermal insulation is a physical object. Preferably, it is a material in the form of one or more layers of a solid - in contrast to gas - which is preferably elastic and / or flexible, in particular also compressible.

A heat-insulating material in the sense of the invention is characterized in that it is disposed between one another lying facing away from each other surfaces of the insulating material itself unfolds a heat-insulating effect by the physical substance located between the surfaces.

Particularly preferably, the heat insulating material is arranged outside the bellows along its shaft region in order to completely insulate the movable region of the decoupling element. In a particularly preferred embodiment, the segments are arranged annularly or helically in the form of overlapping scales around the metal bellows. It is preferably further provided that the segments is arranged around the shaft region of the bellows such that one ring segment is provided per corrugation, and / or that the pitch of a helical winding is matched to the distance between the wave crests. The overlapping segments are each associated with a wave crest of the wave region and the number of segments corresponds to that of the wave crests, whereby the heat insulating material as a whole is movable in the same way as the bellows. Thus, the mobility of the bellows is maintained at an effective isolation. The formed from insulating the thermal insulation forming segments are exposed to only a comparatively small deformation itself.

The invention in a preferred embodiment provides that at least one segment is formed from a profile band or flat band. Particularly preferably, it is provided that the width of the segments is greater than the distance between two adjacent peaks of the bellows. The invention further provides that the width of the segments is dimensioned such that an overlap region between the thickness of the iso lierstoffes amounts to half of the width of the segment itself. Preferably, the insulating effect can be influenced by varying the thickness as well as the width of the individual segments. By sufficient insulation, the temperature on the outside of the decoupling element can be lowered to below 300 ° C.

The insulating material preferably consists of flexible composite materials (metal textile), needled nonwovens, textured E glass, woven fibers of ceramic fibers, heat-resistant carrier fibers and strength-enhancing stainless steel wires and airgel nonwovens. Also, conventional insulating materials such as glass and / or rock wool, felts thereof and glass-based composite materials in which wire ^¬ reinforcements are incorporated, usable. The insulating ^¬ substances may have a carrier and / or be provided to protect against aggressive media with an outer layer that is corrosion and / or temperature resistant. As a carrier, metal sheet, foil, yarn or mesh are possible. The insulating material may in this case be worked around the carrier material, for example, a mesh will be incorporated into the insulating material. Other options include gluing, also with heat-resistant ceramic adhesives, or even a positive fit, in which the carrier material is partially folded around the insulating material. Material for a corrosive resistant protective layer is for example metal sheet or foil made of stainless steel or a ceramic coating of the insulating material.

In a preferred embodiment, it is provided in particular that ring segments are attached to the bellows as segments from the outside, and the latter is thus filled from the outside. is always flexibly isolated. Particularly preferably, at least one undercut is provided ent ^¬ long the circumference of the ring segment, which engages in the troughs of the bellows. Ring segments with only slight or elastic undercuts can easily be slid over the bellows, the latter being the case with a self-elastic insulating material. It is preferably provided that a ring segment is associated with a wave crest of the wave range. For placing the ring segments each on a wave mountain, the invention particularly preferably provides that the ring segments are mounted without an undercut from an end face on the bellows, only after placement of the ring segments, the undercuts are inflected into the troughs, whereby a determination of the Ring segments on bellows is achieved. This is possible if the insulating material is intrinsically stable, that is plastically deformable and accordingly after elimination of the deformation (bending) causing forces, the resulting change in shape maintains. In another embodiment, it is preferably provided that the insulating material is wound helically around the bellows. For this purpose, the insulating material is again strip-shaped or band-shaped. A winding then forms a segment of the heat insulating material or insulating material. The width of the segment is greater than the pitch of the winding, so that an overlap of the subsequent windings is given. A winding direction results from a winding of the strip-shaped insulating material coaxial with the longitudinal axis of the decoupling element starting from a front side to be selected.

It is particularly preferred that the width of the segment is dimensioned such that an overlap region between see an expansion of the insulating material perpendicular to the longitudinal axis, ie, a thickness of the insulating material, up to half the width of the segment amounts. This prevents unwinding of the wound segment. A fixation of the winding happens by the fact that the slope of the winding is selected equal to the wave pitch of the bellows.

In a further embodiment, it is preferably provided that the heat insulation inside the bellows is arranged coaxially inside and / or outside of an agrafl hose arranged inside the bellows. The Agraffschlauch is preferably helically wound or has a plurality of ring segments.

The particular advantage of a heat insulation within the agraffschlauchs is that thereby the Agraffschlauch exposed to the fluid flow and the bellows are thermally isolable against the fluid.

With thermal insulation inside the Agraff hose, the latter does not come into contact with the gas flow as far as possible. Again, at least one flexible band of insulating material, possibly on a support, in ring or helical shape is provided, wherein on the segments undercuts are provided which engage in the Agraffschlauch. It is preferably provided that these undercuts are already hooked when the Agraff tube is wound, ie that a simultaneous winding of Agraff and thermal insulation takes place. Instead of integrating an undercut on the segments, it is also possible to provide an attachment of holding members, eg hooks, on the agraffusion tube. In a further embodiment, a complete omission of undercuts is possible, wherein, for example, in case of helical winding of the segments whose outer diameter of the winding is set slightly larger than the inner diameter of the Agraff tube. For assembly, the winding can be reduced in diameter by torsion so that insertion within the Agraff tube is possible. If the torsion of the coil winding is reversed by release, the insulating material with radial prestress is applied to the Agraff hose. This type of assembly is provided without the use of an Agraffschlauchs ^¬ see. Here, the winding is configured as in the previous embodiments.

For an attachment of the insulating material to the decoupling ^¬ element is particularly preferably provided that the heat insulation at least from its main plane out a bent and / or kinked undercut, which in areas of the peripheral structure of the decoupling element, such as the bellows or a Agraffschlauch, and / or Insulating material engages. Alternatively, it is particularly preferred for fixing and reinforcing the insulating material used that the latter is mounted on a support, which is preferably metallic, such as in the form of a film, a grid (similar to expanded metal) or fabric. However, other materials for the carrier can be used, which provide a stabilization of the insulating material and are correspondingly flexible.

Further embodiments provide that a profile band is provided with wire reinforcements or foil sheathing. Preferably, the invention provides that the at least one carrier has a width which is at least the width of the strip-shaped insulating material corresponds, in particular the carrier laterally oversteps the insulating material in the width, and that the insulating material laterally in the width superior range dese carrier against sei ^¬ ner bent the insulating material main portion and a from this main area at an angle not equal to 0 ° , preferably at 90 °, extending first leg forms as an undercut of the carrier. The undercuts are in this case firmly connected to the carrier material, or bent out of this. Thus, it is provided for a helically formed thermal insulation that per winding at least one undercut engages, for example, in a trough of the bellows.

Such undercuts can not only be simply bent out as an angling, but also have an additional undercut which is formed parallel to the carrier opposite to the winding direction, so that the undercut as a whole has the form of a hook whose opening is directed against the winding direction, wherein at least a laterally arranged on a support carrying the insulating carrier arranged in turns of Agraffschlauchs engages. The carrier material can thus be provided that at least one undercut is formed as a hook on the carrier material, in which a second leg of the carrier material from the one end of the first leg at an angle not equal to 0 °, preferably 90 °, under the first main region of the carrier at a distance to this extends. When forming this further undercut to the shape of a hook, it should be noted that the second leg is not wider than half the width of a segment, so that a quick and easy hooking is possible. The attachment is made by step- have structure of the decoupling element, wherein the second leg preferably engages in turns of an Agraffschlauchs of the decoupling element.

It is particularly advantageous that a large number of undercuts is provided along the carrier or one into a plurality of projections, wherein the undercuts are formed at regular intervals along the carrier. The width of the undercuts is hereby selectable. It can also be provided that the carrier is formed bent over its length in a region projecting beyond the width of the insulating material along at least one longitudinal edge, thus creating a continuous undercut. With a suitable choice of material, it may also be envisaged to form the undercuts from insulating material itself. As a result, a simple hooking into different areas of the decoupling element can take place.

For alternative fixation of segments of the heat insulating material is provided in particular that the heat insulating material can be hooked into a fabric of an existing knitted tube, wherein the knitted tube consists of metal and extends over the entire corrugation of the bellows. Such a knitted tube can either be prefabricated pulled over the bellows or be made by knitting the bellows and / or the Wärmeisoliermaterials. The undercuts engage in the radially outer and / or inner knitted fabric. In order to achieve a simple fixation of an attached inside the bellows Wärmeisoliermaterials, it is further provided that the heat-insulating material and / or the Agraffschlauch is surrounded by a knitted or braided hose.

Alternatively, it can also be provided that segments having a carrier can be hooked into itself by means of appropriately arranged undercuts. For this purpose, the carrier is configured S-shaped, wherein insulating material is introduced alter ^¬ nierend in the S-arms of the wearer. There are provided on the side edges of the carrier undercuts in the form of hooks, which engage in the opposite rear ^¬ cuts of the adjacent insulating layer. It is also possible that several segments are applied in alternate ^¬ the geometry by the segments have Before ^¬ cracks preferably in the middle of the strip. The projections are alternatingly directed ge ^¬ inwards and outwards and thus engage between adjacent segments in the sliding seat.

An essential advantage of the heat-insulating material according to the invention which is formed by segments is that it does not have to be deformed or only slightly deformed for accommodating movements of the decoupling element as a result of the configuration according to the invention with the scale-like overlapping segments. Nevertheless, the insulation layer as a whole is highly flexible.

Further advantages and features of the invention will become apparent from the claims and from the following description, are explained in the embodiments of the invention with reference to the drawings in detail. Hereby shows: 1 shows a first embodiment of a decoupling element according to the invention in a partial longitudinal section with a heat insulating material of ring segments outside of the bellows.

FIG. 2 shows a second embodiment of a decoupling element according to the invention in a partial longitudinal section with a heat insulating material made of wound profiled strip outside the bellows; FIG.

Fig. 3, 4 an attachment of the heat insulating material according to the invention to a bellows of the decoupling element according to the invention; an attachment of the heat insulating material to a knit hose;

FIGS. 7 to 9 show an attachment of the heat-insulating material by means of undercuts of a carrier material;

10 shows a third embodiment of a decoupling element according to the invention in a partial longitudinal section with one around a Agraffschlauch wound thermal insulation material;

Fig. 11 shows a fourth embodiment of a decoupling element according to the invention in a partial

Longitudinal section with a wound within the Agraffschlauchs

Heat insulating material; and

Fig. 12, 13 an attachment of Wicklun

the wound heat insulation material on the Agraffschlauch.

1 shows a first embodiment of a decoupling element 1 according to the invention in a partial longitudinal section. The decoupling element 1 has a bellows 2 with a wave region 2.1 with wave troughs 2.2 and wave crests 2.3 as well as a connection region 2.4. Furthermore, the decoupling element 1 within the bellows 2 a

Agraffschlauch 3 (metal) or other metal hose on. The Agraffschlauch 3 is continuously guided from the beginning to the end of the decoupling element 1 to the free end faces of the associated bellows 2, so that Agraffschlauch 3 and bellows 2 end face axially in one plane. The Agraffschlauch 3 has on both sides a connection area 3.1. The connection areas 2.4 of the bellows 2 and the connection area 3.1 of the Agraff hose 3 are connected to one another by a profile ring 4, preferably by welding. By means of the profile ring 4, the decoupling element 1 with the remaining components of an exhaust system (not shown) is connected. The outer wall of the Baling 2 completely enclosing heat insulating material 5 is provided.

Fig. 1 shows a heat insulating material 5 with scale-like overlapping annular segments 6, engage on one side undercuts 7 along a wave crest 2.3 in a wave trough 2.2, so that the segments 6 have a cross section in the form of an angle. The ring ^¬ segments 6 themselves consist in this embodiment of strip-like insulating material, which can be laid to a ring. The undercuts 7 may be formed along the entire ring member 6, or only partially, wherein in the ring segment 6 then cuts are provided which allow a partial bending or buckling of the segment edges. The undercuts 7 are bent along a descending side of a wave crest 2.3 of the bellows 2 in order to ensure a good fixation. The length of such an undercut 7 is in the range of the width of a wave trough 2.2, whereby the ring segments 6 do not slip off the shaft portion 2.1 of the bellows 2. The Ringseg ^¬ elements are successively drawable from one side of the decoupling element 1 on the bellows, wherein the undercuts 7 after placement of the ring segment 6 at the respective Balgbereich are einbiegbar. The ring segments 6 have a certain width, which is dimensioned such that, when the undercut 7 is folded in, two adjacent ring segments 6 overlap. The resulting overlap region A can be formed in different widths, as also shown in FIGS. 3 and 4. In any case, the width or the axis-coaxial portion of the ring segment 6 is above the mean distance between two peaks 2.3 of the bellows. 2 2 shows a second embodiment of a decoupling element according to the invention. Like parts are designated by the same reference numerals. In this case, the heat insulating material 5 is formed as a continuous profiled strip 8 ^¬ , which is helically wound around the entire wave range 2.1 of the bellows 2 on the wave mountains 2.3 lying. The profiled strip 8 completely encompasses the circumference of the corrugated region 2.1. The individual windings describe helically wound segments which partially overlap in the axial direction. A winding takes place in a winding direction (arrow B), which preferably extends parallel to the center axis of the decoupling element 1 along the entire length of the shaft region 2.1. In Fig. 2, the profile band 8 is formed from a strip-shaped insulating material 9. To stabilize a carrier may be provided, as will be explained. In this embodiment, the profile band 8 has a width that is slightly greater than the distance between two peaks 2.3, which results in a narrow overlap area A.

3 and 4 show a partial view of a decoupling element 1 according to the invention, wherein in Fig. 3, a first possible embodiment of a helical wrapping with profiled strip 8 is shown. Here, the profile band 8 rests on the wave crests 2.3. In order to avoid settlement or slippage of the heat insulating material 5 from the shaft region 2.1, 8 undercuts 7 are provided on the profile band. These are formed perpendicular to the winding direction B, and engage in the troughs 2.2. The undercuts 7 may preferably be individual bends in the form of bent or bent legs, projections or hooks of the profile band 8 itself. This will be explained below. In the embodiment of FIG. 4, in contrast to FIG. 3, the profile band 8 is made wider, resulting in a larger overlap area A. As can be seen in FIGS. 3 and 4, the overlapping area A is at least as wide as the extent of the profiled strip 8 perpendicular to the winding direction, ie the height of the profiled strip 8 itself. In FIG. 4, the overlapping area A is approximately half of that Width of the profile band 8. A larger width improves lent addition to prevent Abwickeins the profile strip 8 from the bellows. 2

Another fixation option is shown in FIG. About the bellows 2 a fabric or knitted hose 11 is pulled. The profile band 8 is constructed such that insulating material 9 is applied to a carrier material 10. On the support 10, in turn, undercuts 7 are formed, but this time does not intervene in the wave range 2.1 of the bellows 2, but in the pulled over the bellows 2 knitted tube 11 or braided hose. The undercuts 7 in this case engage radially from the outside into the mesh of the knitted tube 11.

Fig. 6 shows a variant of the embodiment of Fig. 5, wherein the knitted tube is not directly to the bellows 2 ge ^¬ sets, but is pulled onto a wound profile strip. In this case, the profiled strip 8 is wound around the bellows 2 with the carrier 10 to the outside, wherein the undercuts 7 engage in the knitted tube 11 from the inside to the outside, whereby a good fastening is ensured. The knitted tube 11 can be pulled over the bellows 2 as a whole. If are also shown in Fig.l to 5 with decoupling elements held ^¬ rem Agraff each Darge-presented embodiment is also applicable to elements without Agraff. This applies correspondingly to the embodiments of the following FIGS. 7 to 9.

FIGS. 7 to 9 show other variations of a possible fi xation ^¬ profile strips 8 and ring segments 6. In Fig. 7 and Fig. 8 windings of the profile strip 8 are entangled in itself. In the embodiment of FIG. 7 are provided here ^¬ undercuts to 7 at each both sides of the profile strip 8 as the cable stops which prevent loosening of the overlap. It can also be provided undercuts 12 in the middle of the profile strip 8, which serve the lateral undercuts 7 as cable stops. The undercuts 7 are preferably formed on the carrier ^¬ layer 10.

This is continued in FIG. 8 in that the undercut 7 is hook-shaped on the carrier 10 in that a first leg 7.1 is connected to a second leg 7.2 which has an angle of 90 ° to the first leg 7.1. The second leg 7.2 is arranged parallel to the main region of the carrier 10. As such, the carrier 10 is S-shaped as Agraff. The insulating material 9 is provided in the form of two side by side, but offset tracks arranged. These can be arranged facing away from one another on the outer sides of the agraff carrier tape or facing one another on its inner sides (and thus encircled on three sides) or be completely enclosed by the carrier material. FIG. 9 shows, in a partial section in the axial direction, successive ring segments 6 corresponding to FIG. 1, which in each case have a projection 13 in the center. The projections 13 are directed alternately inwards and outwards and thus engage between adjacent ring segments in the sliding seat. This arrangement is also possible for two profiled strips 8 to be wound, the projections 13 of one strip engaging between two adjacent turns of the other.

10 and 11 show further embodiments of the decoupling element 1 according to the invention in a partial longitudinal section, wherein the heat insulating material 5 is not applied outside of the bellows 2, as in the previously described embodiments. The heat insulating material 5 is rather disposed within the bellows 2. In Fig. 10, the heat insulating material 5 in the form of a flat strip 14 (here only of insulating material) is helically wound around the outer wall of an inliner in the form of an Agraffschlauchs 3 shown only schematically. The heat insulating material 5 can also be used as a flexible inner layer in ring form.

FIG. 11 shows a further embodiment of a decoupling element 1 according to the invention, wherein the insulation 5 is arranged within an agraffusion tube 3, which is also indicated only schematically. The winding of the flat strip 14 takes place outside of the decoupling element 1. By twisting the coil winding this can be reduced in diameter, so that an insertion into the interior of the Agraffschlauchs 3 is possible. The outside of the helical winding of the insulation 5 thus adjoins the inner wall of the Agraffschlauchs 3. The torsion of the winding is reversible feasible, whereby the heat insulating material 5 rests with a radial bias on the inside of the Agraff hose 3.

In Fig. 12 to the embodiments shown in Fig. 10 and 11, a possible fixation of the heat insulating material 5 on Agraffschlauch 3 is shown. Furthermore, a longitudinal section through a region of an Agraff tube 3 is shown, whose windings 3.2 have an S-shaped contour in section. Insulating material 9 is in turn applied to a carrier 10, the carrier 10 being widened beyond the width of the insulating material 9. This broadening to the outside is in the form of an undercut angling with a first leg 15 is formed. The first leg 15 of the carrier 10 engages in the S-shaped contour of the windings 3.2. For this purpose, FIG. 12 represents a simple angling. Variants with or without a further undercut are possible. The bend with a first leg 15 of FIG. 13 has a further undercut in the form of a second leg 16, which engages the contour of the turns 3.2 of the Agraffschlauchs 3 in the interstices of the turns 3.2. As a result, a secure attachment of the profile strip 8 is ensured. The erection of the heat insulating material 5 takes place parallel to the winding of the Agraffschlauchs 3rd

Further embodiments of the present invention also include for the embodiments shown in Fig. 10 and Fig. 11 additional fixations by knitted fabrics, wherein a knitted tube can be pulled around the winding of the heat insulating material 5. Bezugszeichenl

1 decoupling element

2 bellows

2.1 wave area

2.2 wave trough

2.3 Wave Mountain

2.4 Connection area

3 agraff hose

3.1 Connection area

3.2 turns

4 profile ring

5 heat insulating material

6 ring segments

7 undercut

7.1 first leg

7.2 second leg

8 profile band

9 insulating materials

10 carriers

11 knitted tube

12 undercut

13 projections

14 flat band

15 first leg

16 second leg

A overlap area

B winding direction

Claims

claims

1. decoupling element, in particular for exhaust pipes of internal combustion engines in motor vehicles, with a bellows (2) and a thermal insulation (5), characterized in that the thermal insulation (5) is formed by heat insulating material in the form of annular segments, or that the thermal insulation (5) is formed by heat insulating material in the form of a helically wound tape with ge ^¬ formed by individual wraps segments and that the segments overlap in the direction of the axis of the bellows (2).

2. decoupling element according to claim 1, characterized marked ^¬ characterized in that the heat insulating material (5) outside the bellows (2) along the shaft region (2.1) is arranged.

3. decoupling element according to one of claims 1 or 2, characterized in that the width of the segments is greater than the distance between two adjacent peaks (2.3) of the bellows (2).

4. decoupling element according to one of claims 1 to 3, characterized in that the width of the at least one segment is dimensioned such that an overlap region (A) between the thickness of the insulating material (9) is up to half of the width of the segment itself.

5. decoupling element according to one of claims 1 to 4, characterized in that the heat insulating material (5) at least from its main plane out a bent and / or kinked undercut (7) having in areas of the peripheral structure of the

Decoupling element, such as the bellows (2) or a

Agraffschlauch (3), and / or the insulating material

engages.

Decoupling element according to claim 5, characterized in that the thermal insulating material (5) forming insulating material (9) is inherently stable.

Decoupling element according to one of claims 1 to 6, characterized in that the Wärmeisoliermaterial (5) is formed by strip-shaped insulating material (9) which is mounted on at least one carrier (10), which is preferably metallic.

Decoupling element according to claim 7, characterized in that the at least one carrier (10) has a width which is at least equal to the width of the

strip-shaped insulating material (9)

corresponds, in particular the carrier (10) the

Insulating material (9) projecting laterally in the width.

Decoupling element according to one of claims 1 to 8, characterized in that the insulating material (9) laterally in the width superior region of the support

(10) against its insulating material (9) carrying the main area bent and a from this

Main area at an angle not equal to 0 °,

preferably at 90 °, extending first leg

(15) forms as an undercut of the carrier (10).

Decoupling element according to claim 9, characterized

characterized in that the carrier material at least one Undercut is designed as a hook in which a second leg (7.2, 16) of the carrier material from the one end of the first leg (7.1, 15) at an angle not equal to 0 °, preferably 90 °, below the first main region of the carrier (10 ) extends at a distance to this.

11. decoupling element according to one of claims 1 to 8, characterized in that at least one segment has individual projections (13).

12. decoupling element according to one of the preceding

Claims, characterized in that the at least one undercut (7) in a knitted tube

(11) engages, wherein the knitted fabric consists of metal and over the entire length of the corrugation of the bellows

(2) extends.

13. decoupling element according to one of the preceding

Claims, characterized in that the Wärmeisoliermaterial (5) within the bellows (2) coaxially inside and / or outside of a within the bellows (2) arranged Agraffschlauch (3) is arranged.

14. decoupling element according to claim 13, characterized in that at least one laterally on a the insulating material (9) carrying carrier (10) arranged bend of a first and a second leg (15, 16) in turns (3.2) of the Agraffschlauchs (3) engages.