DE20101644U1 - exhaust manifold - Google Patents

Description

Exhaust manifold

The invention relates to an exhaust manifold for attachment to a cylinder head of an internal combustion engine, which has at least one cylinder bank provided with exhaust bores for the outlet of exhaust gas.

EP 0 709 557 A1 describes an exhaust manifold in which each exhaust pipe is welded to a flange intended for screwing to the cylinder head. Starting from the cylinder head, the exhaust pipes flow into a common manifold, which then continues into the exhaust line.

However, these known exhaust manifolds are very heavy and expensive and, due to their large mass, they remove a great deal of heat from the exhaust gases introduced into them. This leads to a reduction in the temperature of the exhaust gases, which reduces the efficiency of the catalyst arranged in the exhaust line, particularly when starting and during the warm-up phase of the internal combustion engine.

To counteract this problem, an exhaust manifold is known from EP 0 671 551 A1, for example, which has a housing with a gas guide channel arranged therein. However, the welded connection between the outer shell of the exhaust manifold and a flange part connected to the cylinder head, which tends to leak, and the direct contact of the inner pipe with the cylinder head are disadvantageous in this known solution.

EP 0 765 994 A1 describes an exhaust manifold for an internal combustion engine, in the housing of which guide plates are arranged to guide the exhaust gas flowing into the housing towards an outflow channel. The entire housing is to consist of just one plate

are manufactured by punching and bending, with the baffles welded into the housing.

US-PS 4,537,027 describes an exhaust manifold in which the exhaust gases from all exhaust holes are also fed into a common housing.

However, the disadvantage of the last two exhaust manifolds is that sealing problems arise due to the lack of a gas duct, so that it is unlikely that these imaginative solutions will be adopted in series production. Such exhaust manifolds often lead to mutual influence of the exhaust gas streams emerging from the exhaust holes, which can lead to high power losses, particularly in internal combustion engines without exhaust turbochargers.

Another exhaust manifold is known from EP 0 849 445 A1. The sealing device provided here is designed as one piece with the exhaust manifold, which means that the tightness of this exhaust manifold cannot be guaranteed. In addition, the exhaust manifold, which is heated by the exhaust gases, can give off its heat to the cylinder head and thus

heat up, which can even cause engine damage.

From MTZ 60 (1999), page 20, an exhaust manifold is known in which individual pipes formed by internal high pressure are brought together from the exhaust holes through an outer shell into an area that merges into the exhaust line.

However, the very complicated shape of the individual pipes and the resulting complex manufacturing process are disadvantageous. Another problem with this known exhaust manifold is that an extremely complex, separate construction is required for each different internal combustion engine.

It is therefore an object of the present invention to provide an exhaust manifold for attachment to a cylinder head of an internal combustion engine, which, in addition to simple and cost-effective production and low mass, ensures that mutual influence of the exhaust gas flows emerging from the individual exhaust bores is prevented.

According to the invention, this object is achieved by the features mentioned in claim 1.

The lines used according to the invention separate the exhaust gases from the exhaust holes from one another and in this way form a gas guide channel with individual lines for each exhaust hole. This separation of the individual exhaust gas flows from one another results in a very low flow resistance for the exhaust gases, which, for example, when operating the internal combustion engine with surge charging, leads to a considerable increase in torque and thus power due to the higher kinetic energy of the exhaust gas.

A further advantage of the exhaust manifold according to the invention is that by avoiding mutual influence of the individual exhaust gas flows in the combustion chambers of the internal combustion engine, a very high negative pressure is created in a much shorter time, which enables optimal conditions for the subsequent filling of the combustion chamber with the fuel/air mixture.

"•&Ggr;:""

it* · ·

• t . · » t · · i i

The air gap-insulated exhaust manifold created according to the invention removes relatively little heat from the exhaust gas due to its thin walls of the guide plates forming the gas guide channel, thereby preventing a drop in the exhaust gas temperature and significantly improving the response behavior and the efficiency of a downstream exhaust gas catalyst.

The sealing device according to the invention between the exhaust manifold housing and the cylinder head ensures a secure seal of the exhaust manifold housing against the environment, which also enables movements between the exhaust manifold housing and the cylinder head caused, for example, by the effects of heat, whereby otherwise required, complex constructions, such as with sliding flanges or the like, can be dispensed with.

In a further development of the invention, it can be provided that the lines are each constructed from individual guide plates, which enables a particularly simple construction and in particular manufacture.

If, in an advantageous embodiment of the invention, the guide plates are each provided with a collar on their side facing the cylinder head, which is clamped at least indirectly between the exhaust manifold housing and the sealing device or the cylinder head, the individual guide plates are enabled to carry out movements caused by the effects of heat relative to the sealing device and/or relative to the exhaust manifold housing. This can help to increase the durability of the exhaust manifold according to the invention.

Particularly advantageously, this collar attached to the guide plates can be guided in a circumferential recess of the exhaust manifold housing, which can be provided in an advantageous development of the invention.

Further advantageous embodiments and developments of the invention emerge from the remaining subclaims and from the exemplary embodiments shown in principle below with reference to the drawing.

.: t t .: t

It shows:

Fig. 1 shows a highly schematic internal combustion engine with an exhaust manifold attached to it;

Fig. 2 is a perspective view of a first embodiment of the exhaust manifold according to the invention;

Fig. 3 is a perspective view of a second embodiment of the exhaust manifold according to the invention;

Fig. 4 is a perspective view of a third embodiment of the exhaust manifold according to the invention;

Fig. 5 is a perspective view of a fourth embodiment of the exhaust manifold according to the invention;

Fig. 6 is a perspective view of a fifth embodiment of the exhaust manifold according to the invention; and

Fig. 7 is a perspective view of a sixth embodiment of the exhaust manifold according to the invention.

Fig. 1 shows an exhaust manifold 1 which is attached to a cylinder head 2 of an internal combustion engine 3. In the present embodiment, this is an internal combustion engine 3 in series construction, in which the cylinder head 2 has only one cylinder bank 4 with, in this case, three cylinders or combustion chambers 5. In the case of internal combustion engines 3 in V construction, several cylinder banks 4 with associated cylinder heads 2 could of course be provided, to each of which an exhaust manifold 1 would then be attached.

In the cylinder head 2 there are three exhaust holes 6, each of which extends from the cylinders 5 and opens into the exhaust manifold 1, whereby, of course, more than three cylinders 5 with associated exhaust

»»»4 &Idigr; ti « ·« «

holes 6 can be provided. In this way, the exhaust gas reaches the exhaust manifold 1. The exhaust manifold 1 is provided with an opening 7 on its side facing away from the internal combustion engine 3, which opening can be located anywhere and to which an exhaust line 8 is connected in a known manner. In the present case, the opening 7 is located in a lateral area of the exhaust manifold housing 9. An exhaust gas catalyst (not shown) serving to clean the exhaust gases can also be located in the exhaust line 8.

Fig. 2 shows a perspective, sectional view of a first embodiment of the exhaust manifold 1. There, an exhaust manifold housing 9 is provided as the outermost element, which is able to receive the exhaust gases from the exhaust bores 6 of the cylinder head 2. Between the exhaust manifold housing 9 and the cylinder head 2 (not shown in Figures 2 to 7 for better clarity), a sealing device 10 is arranged, which consists of a high-temperature-resistant metal in order to shield the cylinder head 2 from the high temperatures of the exhaust manifold 1.

The exhaust manifold housing 9 is surrounded on its entire circumference by a circumferential collar 11, which is provided at regular intervals with recesses 12 for the passage of fastening means (not shown). With the aid of the fastening means, the exhaust manifold housing 9 can be screwed onto the cylinder head 2, for example. In order to enable movements of the exhaust manifold housing 9 relative to the sealing device 10 and thus relative to the cylinder head 2, the recesses 12 are designed in the form of elongated holes.

A gas guide channel 13 is arranged within the exhaust manifold housing 9, which in the present case is made up of a total of three lines 14, 15 and 16. Each of the lines 14, 15 and 16 in turn has two guide plates 14a and 14b, 15a and 15b and 16a and 16b. The guide plates 14a and 14b are assigned to the first exhaust hole 6, the guide plates 15a and 15b to the second and the guide plates 16a and 16b to the third exhaust hole 6 and are each located in the immediate vicinity on both sides of the associated exhaust holes 6. In the present case, therefore, for each exhaust hole 6 there is a line 14, 15 or 16 consisting of two

-12- *. i * i * i &iacgr; * &igr;

Baffles 14a, 14b, 15a, 15b, 16a and 16b are provided. The baffles 14a, 14b, 15a, 15b, 16a and 16b separate the exhaust gases exiting the individual exhaust holes 6 from one another and can prevent these exhaust gases from influencing one another as they flow out of the internal combustion engine 3. This is particularly advantageous when the internal combustion engine 3 is to be operated with so-called pulse charging.

The guide plates 14a, 15a and 16a each extend to the area in which the exhaust manifold housing 9 merges into the exhaust line 8, i.e. to the area of the opening 7, whereby a flange element connecting the exhaust manifold housing 9 to the exhaust line 8 is not shown. By guiding the guide plates 14a, 15a and 16a in this way, any influence of the exhaust gases flowing in through the individual exhaust holes 6 on one another is excluded and the exhaust gases can leave the exhaust manifold 1 unhindered. Since the opening 7 in the described embodiment is located in a lateral area of the exhaust manifold 1, the line 14 extends from a lateral end of the exhaust manifold housing 1 to its opposite end.

lateral end and is therefore considerably longer than the line 16 which leads from the exhaust gas bore 6 located immediately next to the opening 7 to the opening 7.

In contrast to the guide plates 14a, 15a and 16a, the guide plates 14b and 15b end where they meet the guide plates 15a and 16a of the subsequent exhaust bore. In this way, material and thus weight savings can be achieved, since only one plate is required in each case to sufficiently separate the adjacent exhaust bores 6 or the lines 14, 15 and 16 from one another.

On the side of the guide plates 14a, 14b, 15a, 15b, 16a and 16b facing the cylinder head 2, a base plate 17 is provided, which in this case has three holes 18, the positions of which essentially correspond to the positions of the exhaust holes 6. In addition, the base plate 17 has embossings 19 arranged between the holes 18, which each consist of elevations extending away from the cylinder head 2 and beads embossed in the direction of the cylinder head 2 and serve to reinforce

-1 Λ

—Lh—

ing of the base plate 17 and prevent vibrations of the base plate 17. The base plate 17 itself shields the cylinder head 2 against heat from the gas guide channel 13. If the base plate 17 is omitted, the sealing device 10 takes over its function.

Each of the guide plates 14a, 14b, 15a, 15b, 16a, 16b is provided on its side facing the cylinder head 2 with a collar 20 which runs under a recess 21 assigned to the exhaust manifold housing 9 or located on the same and is thus movably clamped between the exhaust manifold housing 9 and the sealing device 10. The base plate 17 also has a circumferential collar 22 which is arranged below the collar 20 and thus also below the recess 21 of the exhaust manifold housing 9. In this way, it is possible for the lines 14, 15 and 16 or the guide plates 14a, 14b, 15a, 15b and 16a, 16b to be able to carry out movements caused by the effects of heat within certain limits with respect to the sealing device 10 and/or with respect to the exhaust manifold housing 9.

In the exhaust manifold 1 according to Fig. 3, in contrast to the embodiment described above according to Fig. 2, the guide plates 15a and 16a have been omitted, which leads to larger distances between the guide plates 14b and 15b and 15b and 16b. This naturally also means that the lines 15 and 16, into which the exhaust gases flow from the exhaust holes 6, are larger. The size of the line 14, however, does not change. This design therefore achieves a reduction in weight and cost compared to the embodiment described above, which, however, depending on the particular design of the internal combustion engine 3, may be neutralized again by the less precise guidance of the exhaust gas through the lines 14, 15 and 16 of the gas guide channel 13. This depends on the particular conditions of the specific internal combustion engine to which the exhaust manifold 1 is attached. In this described embodiment, the guide plates 14a, 14b and 15b extend to the opening 7 at which the exhaust gas collecting housing 9 merges into the exhaust gas line 8.

•♦ *

• · · &bgr;

· 4

· ··■

Another embodiment of an exhaust manifold 1 is shown in Fig. 4. In comparison with the embodiment according to Fig. 2, the guide plates 14b, 15b and 16b are omitted. Here, too, there are changes in the size of the lines 14, 15 and 16, which are all larger here. In principle, various guide plates 14a, 14b, 15a, 15b, 16a and 16b can be omitted, as long as the exhaust gases flowing out of the exhaust holes 6 are separated from one another.

In comparison with Figures 2, 3 and 4, fundamentally different embodiments of the exhaust manifold 1 are shown in Figures 5, 6 and 7. The main difference is that the opening 7, at which the exhaust manifold housing 9 merges into the exhaust line 8, is no longer arranged in a lateral area of the exhaust manifold housing 9, but directly opposite the cylinder head 2 in a central area of the exhaust manifold housing. As a result, the lines 14, 15 and 16 also provided here, which extend from the exhaust holes 6, no longer necessarily run from one side of the exhaust manifold housing 9 to the other side of the same, but

the two outer lines 14 and 16 run from the outside, i.e. from the two side areas, to the middle area of the exhaust manifold housing 9. The line 15 leading away from the middle exhaust hole 6 runs essentially along the longitudinal axis of the associated exhaust hole 6, i.e. essentially perpendicular to the plane of the sealing device 10, since the opening 7 is arranged directly above the middle exhaust hole 6. This results in a kind of layering of the lines 14, 15 and 16.

In contrast to the exhaust manifold 1 according to Fig. 2, Fig. 3 and Fig. 4, the lines 14, 15 and 16 are not each made of two guide plates, but in the embodiment according to Fig. 5 are designed as follows: The middle line 15 is formed by a guide plate 23 running continuously from the exhaust bore to the opening 7 with a circular, closed cross-section in its area facing the exhaust bore 6, whereas the two outer lines 14 and 16 each have an inner guide plate 24 and an outer guide plate 25. These are one and the same guide plate 24 or 25, which are both on both sides of the middle exhaust bore.

tion 6, wherein the guide plate 24 rests against the guide plate 23.

The guide plate 23 is designed in such a way that it separates the two outer lines 14 and 16 from one another, for which purpose it has a projection 26 in the area immediately in front of the opening 7, which is directed towards the edge of the outer guide plate 25 and is in contact with the latter. There is also a projection on the side of the guide plate 23 opposite the projection 26 shown, although this cannot be seen due to the sectional view. Of course, the described separation of the lines 14, 15 and 16 from one another could also be achieved by an oval design of the line 15.

In the embodiment of the exhaust manifold 1 according to Fig. 6, the guide plate 24 has been omitted, whereby the outer lines 14 and 16 are formed only by the guide plate 23 and the outer guide plate 25. This enlarges the outer lines 14 and 16, which may result in a less precise guidance of the exhaust gas through the lines 14 and 16. In contrast, however, there is a reduction

reducing the mass and also the cost of the gas guide channel 13. The projection 26 for sealing the lines 14, 15 and 16 against each other is, however, also provided here.

In the exhaust manifold 1 according to Fig. 7, the guide plate 23 was omitted, with the consequence that the middle line 15 is now formed by the guide plate 24. The lines 14 and 16 remain unchanged compared to Fig. 5. As a result, the line 15 is enlarged and the guide plate 24 is provided with the projection 26 otherwise attached to the guide plate 23.

The exhaust manifolds 1 shown, in which the lines 14, 15 and 16 are stacked on top of each other, are of course also conceivable for internal combustion engines 3 with four or more cylinders 5. In this case, there would possibly be no central exhaust bore 6 and the opening 7 could be located between two exhaust bores 6. However, the arrangement of the lines required for this, which extend beyond the lines 14, 15 and 16, can be easily imagined by the expert. The same also applies to the designs

according to Figures 2, 3 and 4, if more than three cylinders 5 are provided.

The exhaust manifolds 1 according to Figures 5, 6 and 7 also have the base plate 17 with the holes 18 and the embossings 19 and perform the function already described above. The same applies to the respective collar 20 on the guide plates 23, 24 and 25. These are in turn arranged, together with the collar 22 of the base plate 17, below the recess 21 of the exhaust manifold housing 9 in such a way that movements of the lines 14, 15 and 16 caused by the effects of heat are possible.

In all embodiments, the gas guide channel 13 is made of a high-temperature-resistant metal, as it must be able to withstand relatively high exhaust gas temperatures. Due to this material selected for the gas guide channel 13 and an air gap 27 between the gas guide channel 13 and the exhaust gas collector housing 9, which separates the hot exhaust gas within the gas guide channel 13 from the cold ambient air and thus ensures insulation, the exhaust gas collector housing 9 can be made of a

relatively inexpensive structural steel or, for example if noise problems occur, cast iron. For example, the material number 1.4828 can be used for the gas guide channel 13, which preferably has a thickness of approx. 0.8 mm, and the material number 1.4512 can be used for the exhaust manifold housing 9, which has a thickness of approx. 2 mm.

The exhaust manifold housing 9, the base plate 17 and the individual guide plates 14a, 14b, 15a, 15b, 16a, 16b, 23, 24 and 25 can be manufactured cost-effectively and reliably by deep drawing.

In a manner not shown, the sealing device 10 arranged between the exhaust manifold housing 9 and the cylinder head 2 can have three and possibly more bores, the positions of which correspond at least approximately to the positions of the exhaust bores 6. Furthermore, it can be provided that the sealing device 10 has a bead running around the outside of the bores, which on the one hand rests on the cylinder head 2 and on the other hand on the respective guide plate 14a, 14b, 15a, 15b, 16a, 16b or 23, 24, 25 or on the base plate 17. In addition,

•♦ ·

A second circumferential bead runs outside the first bead, which rests on the cylinder head 2 on the one hand and on the exhaust manifold housing 9 on the other hand in order to seal them against each other. Of course, recesses should also be provided in the sealing device 10 which correspond to the recesses 12 of the exhaust manifold flange.

Also not shown is an adapter flange, which may be arranged between the sealing device 10 and the exhaust manifold housing 9 for closing holes in the cylinder head 2. This adapter flange is adapted to the shape of the sealing device 10 and a further sealing device can be arranged between the exhaust manifold housing 9 and the adapter flange.

Claims (24)

1. Exhaust manifold for attachment to a cylinder head of an internal combustion engine, which is provided with several exhaust holes for the outlet of exhaust gas, having the following features: 1. 1.1 an exhaust manifold housing ( 9 ) for collecting exhaust gas from the cylinder head ( 2 ); 2. 1.2 a sealing device ( 10 ) arranged between the exhaust manifold housing ( 9 ) and the cylinder head ( 2 ); 3. 1.3 the exhaust manifold housing ( 9 ) has recesses ( 12 ) through which it can be connected to the cylinder head ( 2 ) via fastening means; 4. 1.4 lines ( 14 , 15 , 16 ) are arranged within the exhaust gas collection housing ( 9 ), which form a gas guide channel ( 13 ); 5. 1.5 the exhaust gases from the individual exhaust holes ( 6 ) are separated from one another by the lines ( 14 , 15 , 16 ); 6. 1.6 the lines ( 14 , 15 , 16 ) are held by the exhaust gas collection housing ( 9 ) in such a way that movements of the lines ( 14 , 15 , 16 ) caused by the action of heat are possible; 7. 1.7 the lines ( 14 , 15 , 16 ) extend at least as far as a transition from the exhaust manifold housing ( 9 ) into an exhaust line ( 8 ). 2. Exhaust manifold according to claim 1, characterized in that the lines ( 14 , 15 , 16 ) are each constructed from individual guide plates (14a, 14b, 15a, 15b, 16a, 16b; 23, 24, 25). 3. Exhaust manifold according to claim 2, characterized in that the guide plates ( 14 a, 14 b, 15 a, 15 b, 16 a, 16 b; 23 , 24 , 25 ) are each provided with a collar ( 20 ) on their side facing the cylinder head ( 2 ), which is clamped at least indirectly between the exhaust manifold housing ( 9 ) and the sealing device ( 10 ) or the cylinder head ( 2 ). 4. Exhaust manifold according to claim 3, characterized in that the exhaust gas collector housing ( 9 ) has a circumferential recess ( 21 ) in which the circumferential collar ( 20 ) of the guide plates ( 14a , 14b , 15a , 15b , 16a , 16b ; 23 , 24 , 25 ) is guided in such a way that movements caused by the action of heat are possible between the lines ( 14 , 15 , 16 ) and the sealing device ( 10 ) and/or between the lines ( 14 , 15 , 16 ) and the exhaust gas collector housing ( 9 ). 5. Exhaust manifold according to one of claims 1 to 4, characterized in that adjacent exhaust bores ( 6 ) are separated from one another by a respective guide plate ( 14a , 14b , 15a , 15b , 16a , 16b ; 23 , 24 , 25 ). 6. Exhaust manifold according to one of claims 1 to 4, characterized in that for each exhaust bore ( 6 ) two guide plates ( 14 a, 14 b, 15 a, 15 b, 16 a, 16 b; 23 ; 24 , 25 ) are provided, which are each arranged in the immediate vicinity of the exhaust bore ( 6 ). 7. Exhaust manifold according to one of claims 1 to 6, characterized in that the transition from the exhaust manifold housing ( 9 ) to the exhaust line ( 8 ) is designed as an opening ( 7 ) arranged on a lateral region of the exhaust manifold housing ( 9 ). 8. Exhaust manifold according to one of claims 1 to 6, characterized in that the transition from the exhaust manifold housing ( 9 ) to the exhaust line ( 8 ) is designed as an opening ( 7 ) arranged in a central region of the exhaust manifold housing opposite the cylinder head ( 2 ). 9. Exhaust manifold according to claim 8, characterized in that the lines ( 14 , 15 , 16 ) are arranged in layers one inside the other. 10. Exhaust manifold according to one of claims 1 to 9, characterized in that a base plate ( 17 ) is arranged between the individual guide plates ( 14a , 14b , 15a , 15b , 16a , 16b ; 23 , 24 , 25 ) and the sealing device ( 10 ). 11. Exhaust manifold according to claim 10, characterized in that the base plate ( 17 ) is provided with bores ( 18 ) whose positions at least approximately correspond to the positions of the exhaust bores ( 6 ) of the cylinder head ( 2 ). 12. Exhaust manifold according to claim 11, characterized in that the base plate ( 17 ) is provided with embossings ( 19 ) in the region between the bores ( 18 ). 13. Exhaust manifold according to claim 10, 11 or 12, characterized in that the base plate ( 17 ) is provided with a circumferential collar ( 22 ) which runs between the circumferential collar ( 20 ) of the guide plates ( 14a , 14b , 15a , 15b , 16a , 16b ; 23 , 24 , 25 ) and the sealing device ( 10 ). 14. Exhaust manifold according to one of claims 1 to 13, characterized in that the exhaust manifold housing ( 9 ) has a circumferential collar ( 11 ) in which the recesses ( 12 ) for the fastening means are located. 15. Exhaust manifold according to one of claims 1 to 14, characterized in that the sealing device ( 10 ) arranged between the exhaust manifold housing ( 9 ) and the cylinder head ( 2 ) consists of a high-temperature-resistant metal. 16. Exhaust manifold according to one of claims 1 to 15, characterized in that the sealing device ( 10 ) arranged between the exhaust manifold housing ( 9 ) and the cylinder head ( 2 ) has bores whose positions correspond at least approximately to the positions of the exhaust bores ( 6 ). 17. Exhaust manifold according to claim 16, characterized in that the sealing device ( 10 ) arranged between the exhaust manifold housing ( 9 ) and the cylinder head ( 2 ) has a bead running around outside the bores, which on the one hand rests on the cylinder head ( 2 ) and on the other hand on the respective guide plate ( 14a , 14b , 15a , 15b , 16a , 16b ; 23 , 24 , 25 ) or on the base plate ( 17 ). 18. Exhaust manifold according to claim 17, characterized in that a second circumferential bead runs outside the first bead, which rests on the one hand on the cylinder head ( 2 ) and on the other hand on the exhaust manifold housing ( 9 ) in order to seal them against each other. 19. Exhaust manifold according to one of claims 1 to 18, characterized in that the exhaust manifold housing ( 9 ) consists of structural steel. 20. Exhaust manifold according to one of claims 1 to 18, characterized in that the exhaust manifold housing ( 9 ) consists of cast iron. 21. Exhaust manifold according to one of claims 1 to 20, characterized in that the guide plates ( 14a , 14b , 15a , 15b , 16a , 16b ; 23 , 24 , 25 ) consist of a high-temperature-resistant metal. 22. Exhaust manifold according to one of claims 1 to 21, characterized in that an adapter flange for closing bores in the cylinder head ( 2 ) is arranged between the sealing device ( 10 ) and the exhaust manifold housing ( 9 ). 23. Exhaust manifold according to claim 22, characterized in that the adapter flange is adapted to the shape of the sealing device ( 10 ). 24. Exhaust manifold according to claim 22 or 23, characterized in that a further sealing device is arranged between the exhaust manifold housing ( 9 ) and the adapter flange.