DE102022111864A1 - Heating device - Google Patents

Abstract

A heating device for an exhaust system of an internal combustion engine, comprising a support arrangement (18) and at least one heating conductor element (20) which is supported on the support arrangement (18) in the direction of a heater longitudinal axis (L) so that gas can flow through it, the support arrangement (18) being on a First carrier element (37) arranged on the first axial side of the at least one heating conductor element (20), a second carrier element (41) arranged on a second axial side of the at least one heating conductor element (20), and a first carrier element (37) with the second carrier element (41 ) connecting, which comprises at least one heating conductor element radially outwardly axially overlapping carrier element connection region (44), wherein between the first carrier element (37) and the at least one heating conductor element (20) first electrically insulating bearing material (47) is arranged and between the second carrier element ( 41) and the at least one heating conductor element (20) second electrically insulating bearing material (48) is arranged. The first electrically insulating bearing material (47) and/or the second electrically insulating bearing material (48) extends into at least one intermediate space (24) formed between adjacent heating conductor sections (22, 28, 30) and/or adjacent heating conductor section connecting regions (26).

Description

The present invention relates to a heating device for an exhaust system of an internal combustion engine according to the preamble of claim 1.

Such heating devices are used in exhaust systems to heat gas flowing in an exhaust system, for example the exhaust gas emitted by an internal combustion engine. In particular, in a starting phase of the working operation of an internal combustion engine, in which the exhaust gas emitted by it has a comparatively low temperature, the heat absorbed in the exhaust gas by a heating device can be transferred to an exhaust gas treatment arrangement arranged downstream, for example a catalytic converter or particle filter. Rapid heating of such an exhaust gas treatment arrangement is thus achieved and the period of time during which exhaust gas is released into the environment without, for example, a catalytic cleaning process taking place in the exhaust gas treatment arrangement, can be significantly shortened.

From the US-A-5,597,503 a heating device according to the preamble of claim 1 is known, in which a substantially disk-like heating conductor element comprises a plurality of elongated heating conductor sections which run essentially parallel to one another. In each of their longitudinal end regions, the heating conductor sections connect to an adjacent heating conductor section in a heating conductor connection region. In the other of their longitudinal end regions, the heating conductor sections connect to another heating conductor section in a heating conductor section connecting region, so that in principle a substantially meander-like structure of the heating conductor sections results. The last two heating conductor sections of this meander-like structure each provide a heating conductor element connection area, in which a contact element passing through a housing-like exhaust gas guide element connects to the respective heating conductor element connection area and thus establishes an electrical connection with a voltage source.

The disk-like heating conductor element is supported in its radially outer region on a carrier arrangement which is basically designed with a ring-like structure. On an inflow side of the heating conductor element, this includes an upstream support ring which radially engages over the heating conductor element in its radially outer region. On an outflow side of the at least one heating conductor element, a downstream carrier ring of the carrier arrangement is arranged radially overlapping the heating conductor element in its radially outer region. The two carrier rings are firmly connected to one another by a carrier ring connection area formed by the exhaust gas guide component. Between the carrier rings and the radially outer region of the heating conductor element and also between the radially outer region of the heating conductor element and the carrier ring connection region, bearing material is arranged, through which the heating conductor element is held on the carrier arrangement in an electrically insulated manner.

It is the object of the present invention to provide a heating device for an exhaust system of an internal combustion engine, in which the at least one heating element bearing material stored on the carrier arrangement is held in a defined position

According to the invention, this object is achieved by a heating device for an exhaust system of an internal combustion engine, comprising a support arrangement and at least one heating conductor element supported on the support arrangement in the direction of a heater longitudinal axis through which gas can flow, the support arrangement being a first heating conductor element arranged on a first axial side of the at least one heating conductor element Carrier element, a second carrier element arranged on a second axial side of the at least one heating conductor element and a carrier element connecting region connecting the first carrier element to the second carrier element and comprising at least one heating conductor element extending axially radially on the outside, wherein between the first carrier element and the at least one first heating conductor element electrically insulating bearing material is arranged and between the second carrier element and the at least one heating conductor element second electrically insulating bearing material is arranged, the at least one heating conductor element being designed, for example, in a disk-like manner and having a plurality of heating conductor sections, a gap being formed between adjacent heating conductor sections and at least one part the heating conductor sections in a heating conductor section longitudinal end region in a heating conductor section connection region connect to an adjacent heating conductor section and/or in another heating conductor section longitudinal end region in a heating conductor section connection region connect to another adjacent heating conductor section, characterized in that the first electrically insulating bearing material is in at least one gap formed between adjacent heating conductor sections and/or adjacent heating conductor section connecting regions, and/or that the second electrically insulating bearing material extends into at least one between adjacent heating conductor sections and/or adjacent heating conductors The space formed between the cut-connection areas extends.

The bearing material extending into an intermediate space creates a positive connection between it and the heating conductor element. In addition to the frictional connection generated by the compressed or preloaded installation of the bearing material between the bearing material and the heating conductor element on the one hand or the bearing material and the carrier arrangement on the other hand, this positive connection contributes to increased stability, taking into account the mechanical and thermal loads that occur, for example, in a vehicle the holder of the heating conductor element on the support arrangement. The holding interaction generated in this way is resistant to corrosive media and deposits that arise during operation and is not influenced by the electrical current conducted through the heating conductor element.

For a holding interaction that is substantially uniform over the circumference, it is proposed that the first bearing material comprises a first bearing material ring that essentially completely surrounds the heater longitudinal axis, and/or that the second bearing material comprises a second bearing material ring that essentially completely surrounds the heater longitudinal axis. Furthermore, an electrical contact that is essentially unaffected by bearing material can be provided for the at least one heating conductor element if it is not axially covered by bearing material on its outer peripheral surface.

In order to achieve a good electrical insulation effect with equally good corrosion resistance, it is proposed that the first bearing material is constructed with preferably ceramic fiber material and/or that the second bearing material is constructed with preferably ceramic fiber material.

For a substantially meander-like structure of the heating conductor sections of the heating conductor element, at least some of the gaps, preferably all gaps, can be closed in a first gap longitudinal end region by a heating conductor section connecting regions and can be open in a second gap longitudinal end region.

An even further increased stability due to the positive fit when holding the at least one heating conductor element can be achieved if at least some of the gaps, preferably all gaps, in the second gap longitudinal end region are expanded substantially transversely to a gap longitudinal extension direction.

For this purpose, it can be provided, for example, that at least some of the gaps, preferably all of the gaps, have a first gap width in a first gap extension section extending between two heating conductor sections and/or in the first gap longitudinal end region and at least in a part along at least one gap a second gap extension section extending from a heating conductor section connecting region and/or in the second gap longitudinal end region has a second gap width and, and that the second gap width is greater than the first gap width.

In order not to substantially impair the flow through the at least one heating conductor element through the bearing material when held in a stable manner, it is proposed that the first bearing material covers at least part of a respective second gap extension section and/or does not essentially extend into the area of a respective first gap -Extension section extends, and/or that the second bearing material covers at least a part of a respective second gap extension section and/or does not extend substantially into the area of a respective first gap extension section.

The penetration of the bearing material into a respective intermediate space can be supported in that a bearing material loading projection directed towards the intermediate space is provided on at least one, preferably each carrier element in association with at least one, preferably each intermediate space. The bearing material is deformed by such a bearing material loading projection, so that the bearing material loading projection penetrates into it and a positive connection is created between the bearing material loading projection and the bearing material, which leads to an increased holding effect.

In particular, if a respective carrier element is designed as a formed sheet metal part, at least one, preferably each bearing material loading projection can be formed by a formation of a carrier element.

In order to develop the effect of a respective bearing material loading projection where this is to be provided, it is proposed that at least one, preferably each bearing material loading projection is located in the area of at least part of a second intermediate space first ckung section extends and / or does not extend substantially into the area of a first gap extension section.

For a stable holder with a heating conductor element that can still be easily flowed through, the carrier arrangement can be arranged in a ring-like manner surrounding the at least one heating conductor element in a radially outer region.

In the case of a structure that is simple and cost-effective to implement, but is nevertheless corrosion-resistant, at least one, preferably each support element can be constructed with sheet metal material, and/or the support element connection region can be formed in one piece with at least one of the support elements.

The first carrier element can comprise a substantially radially extending first carrier element body, wherein at least one, preferably each bearing material loading projection of the first carrier element can be provided on the first carrier element body. Furthermore, the second carrier element can comprise a substantially radially extending second carrier element body, wherein at least one, preferably each bearing material loading projection of the second carrier element can be provided on the second carrier element body.

The invention further relates to an exhaust system for an internal combustion engine, comprising an exhaust gas guide component through which exhaust gas can flow in a main exhaust gas flow direction, wherein in the exhaust gas guide component there is an exhaust gas treatment arrangement and upstream of the exhaust gas treatment arrangement at least one heating device constructed according to the invention.

• 1 eine perspektivische Ansicht einer Heizvorrichtung für eine Abgasanlage, betrachtet von einer Anströmseite;
• 2 eine Detail-Längsschnittansicht der Heizvorrichtung der 1;
• 3 eine Axialansicht eines scheibenartigen Heizleiterelements der Heizvorrichtung der 1;
• 4 eine weitere Detail-Schnittansicht der Heizvorrichtung der 1;
• 5 eine perspektivische Ansicht der Heizvorrichtung der 1, betrachtet von einer Abströmseite;
• 6 eine Prinzip-Schnittansicht der Heizvorrichtung;
• 7 ein Detail der Prinzip-Schnittansicht der 6 vergrößert;
• 8 eine der 7 entsprechende Darstellung einer abgewandelten Ausgestaltung der Heizvorrichtung;
• 9 eine weitere der 7 entsprechende Darstellung einer abgewandelten Ausgestaltung der Heizvorrichtung;
• 10 eine weitere der 7 entsprechende Darstellung einer abgewandelten Ausgestaltung der Heizvorrichtung;
• 11 eine prinzipartige Darstellung einer Abgasanlage mit einer Heizvorrichtung und einer Abgasbehandlungsanordnung stromabwärts der Heizvorrichtung.

The present invention is described in detail below with reference to the accompanying figures. It shows:

• 1 a perspective view of a heater for an exhaust system, viewed from an inflow side;
• 2 a detailed longitudinal section view of the heating device 1 ;
• 3 an axial view of a disk-like heating conductor element of the heating device 1 ;
• 4 another detailed sectional view of the heating device 1 ;
• 5 a perspective view of the heating device 1 , viewed from an downstream side;
• 6 a principle sectional view of the heating device;
• 7 a detail of the principle sectional view of the 6 enlarged;
• 8th one of the 7 corresponding representation of a modified design of the heating device;
• 9 another one of the 7 corresponding representation of a modified design of the heating device;
• 10 another one of the 7 corresponding representation of a modified design of the heating device;
• 11 a schematic representation of an exhaust system with a heating device and an exhaust gas treatment arrangement downstream of the heating device.

In the figures there is a heating device for an in 11 Exhaust system 10 of an internal combustion engine shown in a schematic representation is generally designated 12. The heating device 12 is arranged in the exhaust system 10 in, for example, a pipe-like or housing-like exhaust gas guide component 14 in a main exhaust gas flow direction A upstream of an exhaust gas treatment arrangement generally designated 16. The exhaust gas treatment arrangement 16 can include, for example, a catalyst unit, for example an SCR catalyst, a particulate filter unit or the like. In such an exhaust gas treatment arrangement 16, the exhaust gas to flow in the exhaust gas main flow direction A onto the heating device 12 and the exhaust gas treatment arrangement 16 is cleaned of pollutants contained therein, for example in a catalytic reaction.

The heating device 12 comprises a support arrangement generally designated 18 and surrounding a heater longitudinal axis L in a ring-like manner. There is an in on the carrier arrangement 18 3 Heating conductor element 20 shown in axial view is carried in such a way that exhaust gas flowing in the main exhaust gas flow direction A or in the direction of the heater longitudinal axis L can flow through it. The heating conductor element 20 is separated from an electrically conductive flat material, for example by laser cutting or the like, and has a fundamentally disk-like structure.

The heating conductor element 20 has a plurality of heating conductor sections 22 which extend essentially in a straight line and also parallel to one another, between which column-like spaces 24 are formed, through which the exhaust gas can flow. In In their longitudinal end regions, the heating conductor sections 22 connect to one another in respective heating conductor section connecting regions 26 which are integrally formed with these, so that a fundamentally meander-like structure of the heating conductor sections 22 running next to one another results.

The heating conductor sections 28, 30 located in the end regions of this meander-like structure connect only in one of their longitudinal end regions in a heating conductor section connection region 26 to a heating conductor section 22 running adjacent thereto and each provide a heating conductor section connection region 32, 34. In the heating conductor element connection areas 32, 34, when a voltage is applied to this heating conductor element 20, through which electric current flows and thereby heats up, is connected via connection elements 50, 52 and contact elements 86, 88 of a feedthrough 84 to a voltage source in a vehicle, for example the on-board voltage system or . a battery, connected.

The gaps 24 formed between heating conductor sections 22 lying next to one another transversely to the heater longitudinal axis L are closed in a respective first gap longitudinal end region 53 by a heating conductor section connection region 26 and are in a respective second gap longitudinal end region 55 towards the radial outside or to an outer peripheral surface 66 of the heating conductor element 20 open. Starting from the respective first gap longitudinal end regions 53, a respective first gap extension section 68 extends, for example with a substantially constant first gap width b, transversely to the respective gap longitudinal extension direction Z, which essentially also corresponds to the longitudinal extension direction of the heating conductor sections 22. In the second gap longitudinal end regions 55, respective second gap extension sections 70 are formed, in which the gaps 24 have a width B transverse to the gap longitudinal extension direction Z, which is greater than the width b in the adjoining first gap extension sections 68 .

The carrier arrangement 18 includes an in 1 First carrier element 37, which can be seen at the front and, in the exemplary embodiment shown, provides an upstream first carrier ring 36, which holds the heating conductor element 20 at its in 1 Visible inflow side 38 lying at the front is covered in its radially outer region. The carrier arrangement 18 further comprises a second carrier element 41 which provides a second carrier ring 40 on the outflow side and which engages over the heating conductor element 20 on its outflow side 42 in its radially outer region. To connect the two carrier elements 37, 41, a carrier element connection area, generally designated 44, is provided on the first carrier element 37 providing the upstream first carrier ring 36. This comprises a plurality of spaced apart and essentially axially extending carrier element connecting sections 46, which overlap the downstream second carrier ring 40 or the second carrier element 41 radially on the outside in the axial direction and are firmly connected to it, for example by welding or soldering. The two support elements 37, 41 can be formed, for example, by punching out and forming a respective sheet metal blank.

For stable and electrically insulated mounting of the heating conductor element 20 between the two carrier elements 37, 41, a first bearing material ring 49 or a second bearing material ring 51 is provided between the radially outer region of the heating conductor element 20 and each of the carrier elements 37, 41 and, for example, along the entire Edge region of the heating conductor element 20 extending first bearing material 47 or second bearing material 48 arranged. The bearing material 47, 48 can be constructed, for example, with electrically insulating fiber material, for example ceramic material, such as silicon oxide or aluminum oxide, and held under axial prestress between one of the carrier elements 37, 41 and the inflow side 38 or the outflow side 42 of the heating conductor element 20 be.

The carrier elements 37, 41 designed as carrier rings 36, 40 in the illustrated embodiment are constructed with a first carrier element body 54 or second carrier element body 56 extending essentially radially and in the circumferential direction. Adjoining the first carrier element body 54 radially on the outside are the carrier element connecting sections 46 which are integral with it, i.e. in one piece, and which overlap the second carrier element body 54 of the second carrier element 41 radially on the outside and are firmly connected to it. Each of the two carrier element bodies 54, 56 is connected radially on the inside by an axial extension 58, 60 which extends in the direction of the heating conductor element 20. The first axial extension 58 of the first carrier element 37 axially partially overlaps or overlaps the first bearing material 47 on its radial inside, so that a gap-like gap 62 is formed between the first axial extension 58 and the inflow side 38 of the heating conductor element 20. Likewise, the second axial extension 60 of the second carrier element 41 engages or overlaps the second bearing material 48 ner radial inner side axially partially, so that a gap-like space 64 is formed between the second axial extension 60 and the outflow side 42 of the heating conductor element 20.

The two axial extensions 58, 60 are formed in one piece with the respective associated carrier element body 54, 56 and are formed by bending the same at the radially inner end region and ensure a defined positioning of the first bearing material 47 and the second bearing material 48 with respect to the heating conductor element 20. At the same time, the two axial extensions provide protection 58, 60 the first bearing material 47 and the second bearing material 48 radially inwards and protect them from external influences, in particular in a state before the heating device 10 is installed in an exhaust system. The gap-like spaces 62, 64 nevertheless ensure that an electrical short circuit cannot occur between the heating conductor element 20, through which current flows during heating mode, and the carrier arrangement 18.

By installing the first bearing material 47 or the first bearing material 49 and the second bearing material 48 or the second bearing material ring 55 under prestress or in compression, the respective bearing material 47, 48 is pressed into the by the action of the respectively assigned carrier element body 54, 56 Intermediate spaces 24 of the heating conductor element 20 are pressed, since the first or second bearing material 47, 48 constructed with fiber material is fundamentally flexible and deformable and does not receive any support in the area of the intermediate spaces 24 covered by it. The resulting structure is shown in principle in 6 shown. It can be seen that the first bearing material 47 and the second bearing material 48, where they cover a respective gap 24 or its second gap extension section 70, form a bearing material bulge 72 or 74, which intervenes between two adjacent heating conductor sections 22 .

The bearing material bulges 72, 74 formed in this way create a positive interaction between the first bearing material 47 or the second bearing material 48 and the heating conductor element 20 in the second intermediate space extension sections 70. In addition to the frictional interaction generated by the mutual contact with one another, increased stability is thus ensured when holding the heating conductor element 20 between the two carrier elements 37, 41. Since the two bearing material rings 49, 51 are dimensioned in the radial direction such that, for example, they only cover the second intermediate space extension sections 70, but do not essentially extend into the area of the first intermediate space extension sections 68, it is ensured that the heating conductor element 20 flow can flow through, particularly in the area of the first intermediate space extension sections 68.

The 7 shows, enlarged, the area of a second intermediate space extension section 70 or a second intermediate space longitudinal end region 55 with the two bearing material bulges 72, 74 generated on the bearing material rings 49, 51 by the axial loading by means of the support elements 37, 41. It can be seen that these have a fundamentally rounded, arch-like structure.

The 8th illustrates an embodiment in which a bearing material loading projection 76 is formed in the second carrier element 41, in particular in the region of the carrier element body 56 thereof, in association with at least one, preferably every gap 24 or second gap extension section 70. Through the bearing material loading projection 76, the second bearing material 48 is pressed more strongly into the second intermediate space extension section 70, which creates an even more intensive positive connection between the second bearing material 48 and the heating conductor element 20.

Each bearing material loading projection 76 formed in the second bearing element 41 is arranged and dimensioned such that it essentially covers an associated second gap extension section 70, but does not extend into the area of the first gap extension section 68 adjoining this. In this way it is ensured that such a bearing material loading projection 76 presses the second bearing material 48 into the intermediate space 24 essentially only in the area of the second intermediate space extension section 70.

It should be noted that, although this is 8th is not shown, the first bearing material 47 can also be pressed into the second intermediate space extension sections 70 covered by the carrier element body 54 of the first carrier element 37, which is formed in this embodiment without bearing material loading projections, as in 7 is illustrated.

At the in 9 In the embodiment shown, bearing material loading projections 78 are formed only in the carrier element body 54 of the first carrier element 37, while the carrier element body 56 of the second carrier element 41 is formed in particular in its second bearing material 48 covering area is essentially planar. Here too, it should be noted that the second bearing material 48 is in one of the 7 Corresponding manner equally where a respective second intermediate space extension section 70 is covered by it, can be pressed into it by the action of the second carrier element 42.

In 10 An embodiment is shown in which bearing material loading projections 76, 78 are provided both in the first carrier element 37 and in the second carrier element 41 in association with at least part of, preferably all, the second gap extension sections 70 or gaps 24. This creates an even further reinforced positive connection between the first bearing material 47 and the second bearing material 48 and the heating conductor element 20. At the same time, as with the embodiments of the 8th and 9 , a positive connection is generated by a respective bearing material loading projection 76, 78 and the bearing material 47, 48 acted upon by this.

The bearing material loading projections 78, 76 formed in the carrier elements 37 and 41 can be produced in a simple manner by forming the sheet metal blanks used to construct the carrier elements 37, 41, for example then, particularly when the carrier elements 37, 41 are designed as sheet metal parts , when the axial extensions 58, 60 are also created or when the carrier element connecting region 44 with the carrier element connecting sections 46 is created on the first carrier element 37.

It should be emphasized that not necessarily every gap 24 in its second gap longitudinal end region 55 has to have a greater width than in the respective first gap longitudinal end region 53. Accordingly, it can also be provided that on one or on both support elements 37, 41 only In association with such gaps 24, the second gap longitudinal end region 55 of which has a greater width, respective bearing material loading projections 78, 76 are provided in order to ensure increased pressing in of the fundamentally flexible or deformable bearing material only where gaps 24 have a greater width 47, 48 to support.

The first bearing material 47 and the second bearing material 48 can also basically be constructed with other flexible, electrically insulating material, for example foamed material, which is deformed when acted upon by a respective associated support element 37 or 41 and thereby creates a respective bearing material bulge 72 or .74 can form.

It should also be noted that in the heating device, the support elements positioned axially on both sides of the at least one heating conductor element do not necessarily have to have the uninterrupted ring structure shown in the figures. For example, the carrier elements can also be provided by several carrier element sections which follow one another in the circumferential direction and are arranged at a distance from one another and thus, in their entirety, each form a ring-like shape of the carrier elements, wherein an axial extension can be formed on at least some of the carrier element sections. Furthermore, in the heating device shown in the figures, for example, more than one heating conductor element can be provided, and the single or possibly several heating conductor elements can have a differently wound course, for example a spirally wound course of the respective heating conductor sections.

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was 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

• US 5597503 A [0003]

Claims (14)

Heating device for an exhaust system of an internal combustion engine, comprising a support arrangement (18) and at least one heating conductor element (20) supported on the support arrangement (18) in the direction of a heater longitudinal axis (L) so that gas can flow through it, the support arrangement (18) being on a first A first carrier element (37) arranged on the axial side of the at least one heating conductor element (20), a second carrier element (41) arranged on a second axial side of the at least one heating conductor element (20), and a first carrier element (37) with the second carrier element (41). connecting, which comprises at least one heating conductor element radially outwardly axially overlapping carrier element connection region (44), wherein first electrically insulating bearing material (47) is arranged between the first carrier element (37) and the at least one heating conductor element (20) and between the second carrier element (41 ) and the at least one heating conductor element (20) second electrically insulating bearing material (48) is arranged, wherein the at least one heating conductor element (20) has a plurality of heating conductor sections (22, 28, 30), with between adjacent heating conductor sections (22, 28, 30 ) an intermediate space (24) is formed and at least part of the heating conductor sections (22) in a heating conductor section longitudinal end region in a heating conductor section connecting region (26) connects to an adjacent heating conductor section (22, 28, 30) and/or in another heating conductor section -Longitudinal end region in a heating conductor section connecting region (26) connects to another adjacent heating conductor section (22, 28, 30), characterized in that the first electrically insulating bearing material (47) is in at least one between adjacent heating conductor sections (22, 28, 30) or/and adjacent heating conductor section connecting areas (26) and/or that the second electrically insulating bearing material (48) is located in at least one between adjacent heating conductor sections (22, 28, 30) and/or adjacent heating conductor section connecting areas (26) formed gap (24). heating device Claim 1 , characterized in that the first bearing material (47) comprises a first bearing material ring (49) which essentially completely surrounds the heater longitudinal axis (L), and/or that the second bearing material (48) essentially surrounds the heater longitudinal axis (L). completely surrounding second bearing material ring (51), and/or that the at least one heating conductor element (20) is not axially covered by bearing material on its outer peripheral surface. heating device Claim 1 or 2 , characterized in that the first bearing material (47) is constructed with preferably ceramic fiber material, and/or that the second bearing material (48) is constructed with preferably ceramic fiber material. Heating device according to one of the Claims 1 - 3 , characterized in that at least some of the gaps (24), preferably all gaps (24), are closed in a first gap longitudinal end region (53) by a heating conductor section connecting regions (26) and in a second gap longitudinal end region (55) is open. heating device Claim 4 , characterized in that at least some of the spaces (24), preferably all spaces (24), in the second space longitudinal end region (55) are expanded substantially transversely to a space longitudinal extension direction (Z). heating device Claim 5 , characterized in that at least some of the spaces (24), preferably all spaces (24), in a first space extension section (68) extending between two heating conductor sections (22) and/or in the first space longitudinal end region (53) has a first gap width (b) and at least in part of a second gap extension section (70) extending along at least one heating conductor section connecting region (26) and/or in the second gap longitudinal end region (55) a second gap width (B) has and, and that the second gap width (B) is larger than the first gap width (b). heating device Claim 6 , characterized in that the first bearing material (47) covers at least a part of a respective second gap extension section (70) and/or does not extend substantially into the area of a respective first gap extension section (68), and/or that second bearing material (48) covers at least part of a respective second gap extension section and/or does not extend substantially into the area of a respective first gap extension section (68). Heating device according to one of the Claims 1 - 7 , characterized in that on at least one, preferably each carrier element (37, 41) in association with at least one, preferably each intermediate space (24) on the intermediate Space (24) facing bearing material loading projection (78, 76) is provided. heating device Claim 8 , characterized in that at least one, preferably each bearing material loading projection (78, 76) is formed by shaping a carrier element (37, 41). heating device Claim 6 and Claim 8 or 9 , characterized in that at least one, preferably each bearing material loading projection (78, 76) extends in the region of at least part of a second gap extension section (70) and/or does not extend substantially into the region of a first gap extension section (68 ) extends. Heating device according to one of the Claims 1 - 10 , characterized in that the carrier arrangement (18) is arranged in a ring-like manner surrounding the at least one heating conductor element (20) in a radially outer region. Heating device according to one of the Claims 1 - 11 , characterized in that at least one, preferably each support element (37, 41) is constructed with sheet metal material, and/or that the support element connection region (44) is formed in one piece with at least one of the support elements (37, 41). heating device Claim 8 or one of the Claims 9 - 12 , if on Claim 8 back-related, characterized in that the first carrier element (37) comprises a substantially radially extending first carrier element body (54), wherein at least one, preferably each bearing material loading projection (78) of the first carrier element (37) on the first carrier element body (54) is provided, or/and that the second carrier element (41) comprises a substantially radially extending second carrier element body (56), wherein at least one, preferably each bearing material loading projection (76) of the second carrier element (41) on the second carrier element body (56 ) is provided. Exhaust system for an internal combustion engine, comprising an exhaust gas guide component (14) through which exhaust gas can flow in a main exhaust gas flow direction (A), wherein in the exhaust gas guide component (14) there is an exhaust gas treatment arrangement (16) and upstream of the exhaust gas treatment arrangement (16) at least one heating device (12) according to one of the preceding claims are arranged.

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