DE102019129382A1 - Process for producing an exhaust-gas unit and an exhaust-gas unit - Google Patents

Abstract

A method for producing an exhaust-gas-carrying unit (10) with a housing (20) and an exhaust-gas-carrying component (12) guided through the housing (20) for a motor vehicle comprises the following steps: providing the exhaust-gas-carrying component (12) and a first and a first second housing half (22, 24), application of at least one flexible insulating mat (14) directly to the inside of the first and second housing halves (22, 24) or directly to the outside of the exhaust-gas component (12), placement of the exhaust-gas component (12) on the inside of the first housing half (22), the insulating mat (14) lying between the exhaust gas-carrying component (12) and the first housing half (22), forming a semifinished product, placing the second housing half (24) on the semifinished product or placing the semifinished product the second housing half (24), the insulating mat (14) lying between the exhaust-gas-carrying component (12) and the second housing half (24), and fixie Ren the first and second housing halves (22, 24) to one another. In addition, an exhaust-gas-carrying unit (10) is specified, which can be obtained using such a method.

Description

The invention relates to a method for producing an exhaust-gas-carrying unit and to such a unit.

Exhaust systems of motor vehicles operate at high temperatures in order to ensure a sufficient operating temperature of an exhaust gas catalytic converter. The high temperatures can arise during the generation of the exhaust gas in an internal combustion engine and can also be set in a targeted manner using heating elements.

Systems carrying exhaust gases, in particular pipelines, are thermally insulated in order to minimize heat losses on the flow path to the catalytic converter. In addition, the thermal insulation also serves to prevent undesired heating of other components in the vicinity.

Exhaust systems are known in the prior art in which pipes carrying exhaust gas are surrounded by flexible mats for thermal insulation. The flexible mats are usually permanently fixed to other housing components, for example by means of adhesive connections or tabs, pins and similar devices.

Such solutions therefore require additional manufacturing steps for attaching the flexible mat to the respective housing component.

The object of the invention is to provide a method for the simpler production of an exhaust-gas-carrying unit, as well as a simple unit itself.

1. a) Bereitstellen des abgasführenden Bauteils sowie einer ersten und einer zweiten Gehäusehälfte,
2. b) Aufbringen wenigstens einer flexiblen Isoliermatte jeweils direkt auf die Innenseite der ersten und zweiten Gehäusehälfte oder direkt auf die Außenseite des abgasführenden Bauteils,
3. c) Platzieren des abgasführenden Bauteils auf der Innenseite der ersten Gehäusehälfte, wobei die Isoliermatte zwischen abgasführendem Bauteil und erster Gehäusehälfte liegt, unter Bildung eines Halbfabrikats,
4. d) Aufsetzen der zweiten Gehäusehälfte auf das Halbfabrikat oder Platzieren des Halbfabrikats in der zweiten Gehäusehälfte, wobei die Isoliermatte zwischen abgasführendem Bauteil und zweiter Gehäusehälfte liegt, und
5. e) Fixieren der ersten und zweiten Gehäusehälfte aneinander.

The object of the invention is achieved by a method for producing an exhaust-gas-carrying unit, with a housing and an exhaust-gas-carrying component for a motor vehicle that is guided through the housing, comprising the following steps:

1. a) Provision of the exhaust-gas-carrying component and a first and a second housing half,
2. b) applying at least one flexible insulating mat directly to the inside of the first and second housing halves or directly to the outside of the component carrying the exhaust gas,
3. c) placing the exhaust-gas-carrying component on the inside of the first housing half, wherein the insulating mat lies between the exhaust-gas-carrying component and first housing half, forming a semi-finished product,
4. d) placing the second housing half on the semifinished product or placing the semifinished product in the second housing half, the insulating mat lying between the component carrying the exhaust gas and the second housing half, and
5. e) fixing the first and second housing halves to one another.

The method according to the invention is characterized in particular in that the flexible insulating mat is applied in the simplest possible way to the outside of the component carrying exhaust gas or directly to the inside of the first and second housing halves.

Correspondingly, according to the invention, there is currently no provision for using further components for fixing the insulating mat. In particular, no adhesive and / or no additional fixing device is provided for the insulating mat. This simplifies the manufacturing process of the exhaust-gas-carrying unit and also the costs of the components used.

The exhaust-gas-carrying component and the first and second housing halves are made, in particular, of metal. All metals which are customary and known in the prior art can be used for exhaust gas cleaning systems. When selecting the metal, sufficient temperature stability and compatibility with the flexible insulating mat are decisive.

The inner sides of the first and second housing halves are shaped in such a way that their contour corresponds to an outer contour of the exhaust-gas-carrying component while forming a uniform distance between them when the first and second housing halves are correctly placed on top of one another. The first and second housing halves can thus form a housing which encloses the component carrying the exhaust gas.

However, the exhaust-gas-carrying component does not have to be completely enclosed by the housing, for example if the first and / or second housing half has recesses.

The flexible insulating mat can be constructed from inorganic fiber materials, for example from mineral wool, rock wool and / or glass wool.

The inner sides of the first and / or second housing half can have inwardly pointing extensions. The extensions ensure increased friction between the at least one flexible insulating mat and the respective housing half and thus stabilize the position of the insulating mat, in particular during the manufacture of the exhaust-gas-carrying unit. This further reduces the risk of the insulating mat slipping unintentionally during processing.

In a variant, in step a) the first housing half is positioned in a first holder assigned to the first housing half and the second housing half in a second holder assigned to the second housing half and the housing halves are placed on top of one another by means of the respectively assigned holder in step d).

The brackets serve to stabilize the position of the housing halves during the manufacture of the exhaust-gas unit. This is necessary in particular because of the generally complicated three-dimensional shape of the exhaust-gas-carrying component, since flat positioning is often not possible without a holder.

The holders have, for example, a recess that is complementary to the outside of the housing half assigned to them.

In addition, the first and / or second holder can also serve to simplify handling of the second housing half and / or the semi-finished product in step d).

In order to ensure the best possible thermal insulation of the exhaust-gas-carrying component, the insulating mat can cover the entire inside of the first and second housing halves and / or completely encircle the exhaust-gas-carrying component.

To further increase the adhesion of the flexible insulating mat, the outside of the exhaust-gas-carrying component, the inside of the first housing half and / or the inside of the second housing half can be sprayed with water immediately before step b) to ensure the adhesion of the insulating mat to the inside of the housing half or to further improve the outside of the exhaust-gas-carrying component.

In contrast to adhesives, water is much cheaper and does not have to remain in the fully assembled unit.

In a further variant, in step c) the component carrying the exhaust gas is fixed in a non-destructive detachable manner on the first housing half by means of a clamp connection. The clamp connection provides a secure connection between the exhaust-gas-carrying component and the first housing half that is sufficient for handling the semi-finished product.

In particular, the clamp connection takes place at opposite ends of the component carrying the exhaust gas.

In yet another variant, in step e) the first and second housing halves are fixed to one another via a welded and / or crimped connection. Such welded and / or crimped connections can be made easily and inexpensively and ensure a reliable connection between the first and second housing halves.

The holders can be designed in such a way that they can also be used as a hemming tool to produce the crimp connection. In other words, suitable hemming tools can be used as a holder.

The housing can have a radially protruding, flange-like edge area which is used for the crimp connection. For example, the edge area runs in a parting plane.

If a welded connection is to be used and a first and / or a second holder is used in the production of the exhaust-gas-carrying unit, these must be designed in such a way that the intended welds are exposed and thus accessible.

In step e), the first and the second housing halves can also be initially fixed to one another by spot welding and then crimped. Thus, a preliminary fixation of the first and second housing halves is achieved via the spot welding, which is then further secured via the crimp connection.

The insulating mat can have two separate mat halves, each mat half being assigned to a housing half and covering this on the inside to the component carrying the exhaust gas. In step b), the mat halves can be placed in the housing halves assigned to them and temporarily fixed to them by a non-destructive detachable connection. This connection is broken again before or after step e).

The temporary fixation ensures that the mat halves remain in their intended position during the handling of the individual components of the exhaust-gas-carrying unit in the manufacturing process.

For example, the temporary connection is a clamp and / or a pair of pliers.

The exhaust-gas-carrying component is in particular an exhaust pipe.

The object of the invention is further achieved by an exhaust-gas-carrying unit for a motor vehicle, with an exhaust-gas-carrying component and a housing surrounding the exhaust-gas-carrying component, the housing being made up of two housing halves connected to one another is composed and a flexible insulating mat is arranged between the exhaust-gas-carrying component and the housing, the insulating mat being in direct contact with the exhaust-gas-carrying component and the housing.

The term “direct” is understood to mean that no further components and / or connecting elements are arranged between the insulating mat and the component carrying exhaust gas and the housing.

In particular, such an exhaust-gas-carrying unit has no adhesive connection and / or no additional fixing devices by means of which the flexible insulating mat is attached to the housing.

Rather, the insulating mat is securely fixed in its position exclusively by means of a press fit between the component carrying the exhaust gas and the housing.

The exhaust-gas-carrying unit has in particular been obtained using a method of the type described above.

The features of the components of the exhaust-gas-carrying unit described in connection with the method apply accordingly to the exhaust-gas-carrying unit in an analogous manner.

• - 1 eine Querschnittsdarstellung durch eine erfindungsgemäße, abgasführende Einheit,
• - 2 eine schematische Darstellung eines ersten Verfahrensschrittes bei der erfindungsgemäßen Herstellung der abgasführenden Einheit,
• - 3 eine schematische Darstellung eines zweiten Verfahrensschrittes bei der erfindungsgemäßen Herstellung der abgasführenden Einheit,
• - 4 eine schematische Darstellung eines dritten Verfahrensschrittes bei der erfindungsgemäßen Herstellung der abgasführenden Einheit,
• - 5 eine schematische Darstellung eines vierten Verfahrensschrittes bei der erfindungsgemäßen Herstellung der abgasführenden Einheit, und
• - 6 ein Blockschema des erfindungsgemäßen Verfahrens.

Further features and properties of the invention emerge from the following description of exemplary embodiments and from the figures. In these show:

• - 1 a cross-sectional view through an exhaust-gas-carrying unit according to the invention,
• - 2 a schematic representation of a first process step in the production of the exhaust-gas-carrying unit according to the invention,
• - 3 a schematic representation of a second process step in the production of the exhaust-gas-carrying unit according to the invention,
• - 4th a schematic representation of a third process step in the production of the exhaust-gas-carrying unit according to the invention,
• - 5 a schematic representation of a fourth process step in the production of the exhaust-gas-carrying unit according to the invention, and
• - 6th a block diagram of the method according to the invention.

In 1 is an exhaust-gas unit according to the invention 10 shown how it can be used in particular in exhaust systems of motor vehicles.

The exhaust-carrying unit 10 comprises an exhaust-gas-carrying component 12th , which is an exhaust pipe in the embodiment shown.

The component 12th is from an insulating mat 14th surrounded, the insulating mat 14th circumferentially the component 12th preferably completely enclosing. The insulating mat 14th serves to prevent getting through the component 12th flowing exhaust gas can cool.

The insulating mat 14th is in the embodiment shown from a first mat half 16 and a separate second mat half 18th composed.

The component 12th and the insulating mat 14th are in one housing 20th recorded that from a first half of the housing 22nd and a second housing half 24 is formed.

The two halves of the housing 22nd and 24 are designed like a half-shell and have an inner contour that is complementary to the outer contour of the component 12th is.

The case halves 22nd , 24 also each have a radially protruding edge region on their peripheral edges 25th on, which is shaped like a flange.

The edge areas 25th serve to hold the two halves of the housing 22nd and 24 to be connected to one another or to be fastened to one another, for example by a welded connection and / or a crimp connection.

In 2 are the components of the exhaust-gas unit 10 out 1 shown individually.

So it can be seen that the component 12th has a multiple curved geometry.

The size of the case halves 22nd and 24 is chosen so that in the exhaust gas unit 10 between the component 12th and the two housing halves 22nd and 24 an even gap on all sides remains in which the insulating mat 14th (see. 1 ) can be included.

In addition, there are recesses in the embodiment shown 26th and 28 in the two halves of the housing 22nd and 24 provided so that the component 12th in the exhaust unit 10 not completely removed from the housing 20th is covered.

The recesses 26th and 28 can for example be provided for a fixing element that is later attached to the component 12th is attached by means of welding or soldering, for example. The Fixing means is, for example, a mounting plate over which the exhaust gas unit 10 is attached on the vehicle side.

The component 12th as well as the housing halves 22nd and 24 are made of metal.

The two mat halves 16 and 18th are made up of inorganic fiber materials, in particular mineral wool, rock wool and / or glass wool.

The outer contours of the mat halves 16 respectively 18th correspond to the inner contours of the first half of the housing 22nd or the second half of the housing 24 .

The first half of the mat 16 corresponds to the first half of the housing 22nd assigned and the second half of the mat 18th the second half of the housing 24 .

For the production of the exhaust gas unit 10 are also a first bracket 30th and a second bracket 32 provided, the first bracket 30th the first half of the case 22nd and the second bracket 32 the second half of the housing 24 assigned.

As already explained above, it is the component 12th and the housing halves 22nd and 24 not about flat components, so that these only poorly on a flat surface during the manufacture of the exhaust-gas-carrying unit 10 can be placed.

The mounts 30th and 32 have recesses 34 or. 36 in which the respective bracket 34 , 36 assigned housing half 22nd , 24 is at least partially included. The recesses 34 and 36 are corresponding to the outer shape of the respective housing half 22nd or. 24 complementary.

This will position the first half of the case 22nd and the second housing half 24 through the bracket 30th or. 32 stabilized.

The method according to the invention for producing the exhaust-gas-carrying unit is described below 10 described.

First, as in 2 shown, the component 12th as well as the first and second housing halves 22nd and 24 provided (step S1 in 6th ).

The two halves of the housing 22nd and 24 are in the holder assigned to them 30th and 32 arranged to keep their position stable.

This is followed by the two mat halves 16 and 18th in the housing half assigned to them 22nd or. 24 applied (step S2 in 6th ).

Immediately before applying the insulating mats 16 and 18th can be the inside of the first and second housing halves 22nd and 24 be sprayed with water. In this way the adhesion between the inside of the respective housing half is established 22nd and 24 and the half of the mat placed on them 16 and 18th improved.

The state after placing the mat halves 16 and 18th is in 3 shown.

As can be seen, the mat halves cover 16 and 18th essentially completely the respective inside of the housing half assigned to them 22nd or. 24 .

Then the component 12th on the inside of the first half of the case 22nd placed as in 4th shown (step S3 in 6th ).

The first half of the case 22nd and the component 12th form together with that between the first housing half 22nd and the component 12th lying first half of the mat 16 a semi-finished product 38 .

The component 12th is then clamped at its opposite ends 40 on the first half of the housing 22nd fixed non-destructively detachable. Of course, the non-destructive detachable fixation can also be implemented in other ways, for example by means of pliers.

Subsequently, the semi-finished product 38 together with the first bracket 30th on the second half of the housing 24 and on the second bracket 32 put on (step S4 in 6th ).

At this point the first half of the case will be 22nd and the component 12th continue through the clamps 40 attached to each other and secured in their relative position to each other.

Then the first half of the housing 22nd and the second housing half 24 be fixed to each other (step S5 in 6th ).

This can be done, for example, initially by applying spot welds 42 happen as in 5 shown.

In this case, the recesses 34 and 36 the first bracket 30th or the second bracket 32 be designed so that the points of the first and second housing halves 22nd and 24 where the welding points 42 are to be attached, are accessible.

After the first and second housing halves 22nd and 24 at least about the welding points 42 are attached to each other, the clamps 40 removed.

Finally the two case halves 22nd and 24 additionally fixed to one another via a crimp connection, the crimp connection in particular in the flange-like edge area 25th he follows.

Alternatively or in addition, it can also be used in addition to the welding points 42 Another weld joint can be attached to the two housing halves 22nd and 24 to attach to each other. This additional welded connection is also made in particular in the flange-like edge area of the housing 20th appropriate.

Finally, the brackets can 30th and 32 removed to the exhaust unit 10 to obtain.

Claims (11)

A method for producing an exhaust-gas-carrying unit (10) with a housing (20) and an exhaust-gas-carrying component (12) for a motor vehicle that is guided through the housing (20), comprising the following steps: a) providing the exhaust-gas-conducting component (12) and a first and a second housing half (22, 24), b) applying at least one flexible insulating mat (14) directly to the inside of the first and second housing halves (22, 24) or directly to the outside of the exhaust-gas-carrying component (12), c) placing the exhaust-gas-carrying component (12) on the inside of the first housing half (22), the insulating mat (14) lying between the exhaust-gas-carrying component (12) and first housing half (22), forming a semi-finished product (38), d) placing the second housing half (24) on the semifinished product (38) or placing the semifinished product (38) on the second housing half (24), the insulating mat (14) lying between the exhaust-gas-carrying component (12) and the second housing half (24), and e) fixing the first and second housing halves (22, 24) to one another. Procedure according to Claim 1 , characterized in that the inner sides of the first and second housing halves (22, 24) have inwardly pointing extensions. Procedure according to Claim 1 or 2 , characterized in that the first housing half (22) in a first holder (30) assigned to the first housing half (22) and the second housing half (24) in a second holder (32) assigned to the second housing half (24) in step a) is positioned and the housing halves (22, 24) are placed on top of one another by means of the respectively associated brackets (30, 32) in step d). Method according to one of the preceding claims, characterized in that the insulating mat (14) covers the entire inside of the first and second housing halves (22, 24) and / or runs completely around the circumference of the exhaust-gas component (12). Method according to one of the preceding claims, characterized in that immediately before step b) the outside of the exhaust-gas-carrying component (12), the inside of the first housing half (22) and / or the inside of the second housing half (24) are sprayed with water. Method according to one of the preceding claims, characterized in that in step c) the exhaust-gas-carrying component (12) is fixed in a non-destructive detachable manner on the first housing half (22) by means of a clamping connection. Method according to one of the preceding claims, characterized in that in step e) the first and second housing halves (22, 24) are fixed to one another via a welded and / or crimped connection. Method according to one of the preceding claims, characterized in that the insulating mat (14) has two separate mat halves (16, 18), each mat half (16, 18) being assigned to a housing half (22, 24) and this on the inside to the exhaust-gas-carrying component ( 12), placed in their assigned housing half (22, 24) in step b) and temporarily fixed to this by a non-destructive detachable connection, the connection being detached before or after step e). Method according to one of the preceding claims, characterized in that the exhaust-gas-carrying component (12) is an exhaust pipe. Exhaust-gas-carrying unit for a motor vehicle, with an exhaust-gas-carrying component (12) and a housing (20) enclosing the exhaust-gas-carrying component (12), the housing (20) being composed of two housing halves (22, 24) connected to one another and a flexible insulating mat ( 14) is arranged between the exhaust-gas-carrying component (12) and the housing (20), the insulating mat (14) being in direct contact with the exhaust-gas-carrying component (12) and the housing (20). Flue gas unit according to Claim 10 , characterized in that the exhaust gas-carrying unit (10) by a method according to one of the Claims 1 to 9 was obtained.

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