DE102016103459B4 - Exhaust silencer - Google Patents

Abstract

Exhaust gas silencer (1) for an exhaust system of an internal combustion engine with a housing (1.2) having an outer housing wall (1.1), with a first intermediate wall (2.1) arranged in the housing (1.2) and with a second intermediate wall (2.2) arranged in the housing (1.2). ), which divide the housing (1.2) into a first chamber (3.1), a second chamber (3.2) and a third chamber (3.3), with an inlet pipe (4) which runs from the outside through the outer housing wall (1.1) into the first Chamber (3.1) is guided and is coupled to the second chamber (3.2), and with an exhaust pipe (5.1) which is guided from the outside through the housing outer wall (1.1) into the first chamber (3.1), the first chamber (3.1 ) is filled with absorbent (8) and designed as an absorption chamber and the third chamber (3.3) is designed as a Helmholtz chamber, an outlet pipe (6) being provided which is guided through the third chamber (3.3) and in the second chamber (3.2 ) opens, characterized in that the exhaust pipe (5.1) is coupled to the inlet pipe (4) in the first chamber (3.1).

Description

The invention relates to an exhaust silencer for an exhaust system of an internal combustion engine with a housing having an outer wall of the housing, with a first partition arranged in the housing and with a second partition arranged in the housing, which divides the housing into a first chamber, a second chamber and a divide the third chamber, with an inlet pipe which is guided from the outside through the outer housing wall into the first chamber and is coupled to the second chamber, and with an exhaust pipe which is guided from the outside through the outer housing wall into the first chamber, the first chamber being with Absorbent is filled and designed as an absorption chamber and the third chamber is designed as a Helmholtz chamber, an outlet pipe being provided which is guided through the third chamber and opens into the second chamber.

An exhaust pipe can also be designed in several parts and put together or composed of half-shells.

An exhaust pipe or a chamber is referred to as coupled if the use of one or more openings in a pipe wall or chamber wall ensures a direct flow connection and/or a direct sound connection between the elements to be coupled.

There is already an exhaust silencer for a motor vehicle from the EP 1 908 930 A2 known. Immediately after the inlet pipe there is an expansion chamber from which the exhaust gas is directed to the two outlet pipes. An intermediate pipe also leads from the expansion chamber into a Helmholtz volume.

The US 8,172,039 B2 also describes an exhaust silencer housing with three partitions. The inlet pipe is led through the first three chambers into the fourth chamber, with the third chamber also being coupled. The two outlet pipes lead from the first chamber through the housing wall to the outside.

The US 7,191,868 B2 also describes an exhaust silencer housing with three partitions. The inlet pipe opens into the first chamber. The outlet pipe is coupled to the second chamber and is led out through the first chamber.
The JP H09-209 739 A and the DE 100 58 142 A1 also described an exhaust silencer housing with partition walls.

The invention is based on the object of designing and arranging an exhaust silencer in such a way that strikingly sporty muzzle acoustics at higher speeds with simultaneous development of secondary engine orders and comfortable muzzle acoustics at lower speeds are achieved.

The object is achieved according to the invention in that the exhaust pipe in the first chamber is coupled to the inlet pipe. The exhaust pipe also serves as an outlet pipe and is preferably coupled directly to the inlet pipe. This coupling can also be done by using a coupling chamber that accommodates the respective mouthpiece of the exhaust pipe and inlet pipe. The Helmholtz chamber is preferably free of absorbent or filling.

The term “ends” only refers to the fact that the respective pipe ends there. The direction of the exhaust gas flow, i.e. whether it flows out or in, is not taken into account.

An exhaust pipe or a chamber is referred to as coupled if the use of one or more openings in a pipe wall or chamber wall ensures a flow connection and/or a sound connection between the elements to be coupled.

This makes it possible to significantly increase the muzzle acoustics, in particular a distinctively sporty muzzle acoustics at higher speeds, as well as the desired auxiliary engine orders at the same time. In addition, comfortable muzzle acoustics are achieved at lower speeds.

With reference to a perforation zone, the ratio of wall area to opening cross section is also referred to as the degree of perforation. The decisive factor for the wall surface and the opening cross section is the projection of the same in the main flow direction of the exhaust gas.

It can also be advantageous for this if the inlet pipe is guided through the first chamber and opens into the second chamber or into the third chamber and if a sound pipe is provided at the mouth in the second chamber, which is led from the second chamber into the third chamber is. By using the sound tube, the third chamber is coupled to the second chamber. Both the inlet pipe and the sound pipe both open via the respective end pipe opening or the pipe end within the second chamber.

Furthermore, it can be advantageous if the inlet pipe and/or the exhaust pipe has a perfora tion zone PE1, via which the inlet pipe and / or the exhaust pipe is coupled to the first chamber. In this case, the first chamber is coupled to the inlet pipe and/or the exhaust pipe. Depending on the characteristics of the inlet and exhaust pipes, a coupling to the first chamber is only provided for one of the two pipes, preferably for the inlet pipe. The exhaust pipe is not coupled to the first chamber and is only coupled to the inlet pipe for the purpose of expelling exhaust gas.

It can also be advantageous if a third intermediate wall is provided, which delimits the second chamber and forms a fourth chamber between the second chamber and the third chamber within the housing, the inlet pipe or the sound pipe being guided through the fourth chamber and in the third chamber opens. The fourth chamber thus separates the second chamber from the third chamber. All four chambers are arranged in series one after the other with respect to the main exhaust gas flow within the outlet pipe or within the inlet pipe. The third chamber is still coupled via the inlet pipe or the additional sound pipe. A coupling of the fourth chamber through the inlet pipe or the sound pipe is also optionally possible.

It can advantageously be provided that the outlet pipe has a perforation zone PA3 in the second chamber or in the fourth chamber. The outlet pipe is perforated in the chamber that directly adjoins the third chamber. This is the fourth chamber if the fourth chamber is present and the second chamber if the fourth chamber is absent. The coupling is preferably carried out through a perforation zone. In the second chamber, the coupling can additionally or alternatively take place via the pipe end and the pipe opening at the end.

It may be of particular importance for the present invention if the inlet pipe has a perforation zone PE2 in the second chamber and/or a perforation zone PE3 in the fourth chamber. The respective perforation zone PE2, PE3 ensures that the inlet pipe is coupled to the second and/or fourth chamber. When using a sound tube, the coupling of the fourth chamber is ensured by a corresponding perforation zone PE3 of the sound tube. If the fourth chamber is missing, the second chamber can be coupled to the second chamber through a perforation in the inlet pipe or the pipe opening at the end of the inlet pipe when it opens into the second chamber.

In connection with the design and arrangement according to the invention, it can be advantageous if the housing comprises an exhaust silencer volume of 27 liters to 36 liters, with the first chamber having a volume of 7 liters to 15 liters and/or the second chamber having a volume of 5 Liters to 12 liters and / or the third chamber has a volume of 8 liters to 15 liters. The aforementioned alternatives for the respective volume ensure that the mouth acoustics of the exhaust silencer are as desired.

It can also be advantageous if the inlet pipe has an inner diameter between 70 mm and 90 mm and/or the exhaust pipe has an inner diameter between 60 mm and 75 mm and/or the outlet pipe has an inner diameter between 50 mm and 65 mm. The aforementioned diameters for inlet and outlet pipes also ensure optimal operation of the silencer in both acoustic and hydromechanical terms, taking into account the flow velocities and dynamic pressure conditions achieved.

In addition, it can be advantageous if the first intermediate wall and/or the third intermediate wall has a wall surface and a perforation zone PZ1, PZ3, with an opening cross section of the perforation zone PZ1, PZ3 being between 40% and 60% of the respective wall surface or a maximum of 70% of the respective Wall area is. By using a perforation zone in the first and/or the third intermediate wall, a coupling between the first chamber and the second chamber or between the second and the fourth chamber is ensured. This coupling has the desired purpose that can be achieved with regard to the muzzle acoustics of the exhaust silencer as a whole.

Furthermore, it can be advantageous if the second intermediate wall has a wall surface and a perforation zone PZ2, with an opening cross section of the perforation zone PZ2 being between 40% and 70% of the wall surface or a maximum of 70% of the wall surface, or if the third chamber with the exception of the coupling the exhaust pipe or the sound pipe is decoupled. The third chamber is a Helmholtz resonator in conjunction with the exhaust pipe coupled to it or with the sound pipe coupled to it. By using a perforation zone in the second intermediate wall, the Helmholtz resonator formed in this way is damped. Regardless of the main resonance frequency of the Helmholtz resonator, high-frequency muzzle noise components in particular are changed by the degree of perforation of this perforation zone PZ2 and thus the bandwidth of the Helmholtz resonator. Alternatively, the third chamber can be completely closed, with the exception of the coupling through the inlet pipe or the sound pipe be partitioned, so that a classic Helmholtz resonator is implemented.

It can be advantageous if the chambers are arranged one after the other in series with respect to a flow direction S of the exhaust gas in the inlet pipe or in the outlet pipe. As already stated in the introduction, there is a main direction of the gas flow in the inlet pipe, as far as the coupling between the first and one of the further chambers is concerned, or also in the outlet pipe, with the chambers, i.e. the first, second and third as well as the fourth chamber in this case Relative to this flow direction, they are arranged one behind the other, i.e. in series. The respective partition walls thus form partition walls between the individual chambers.

Finally, it can be advantageous if at least one of the perforation zones PE1 - PE3, PA3 is limited to an angular section between 150° and 210° in relation to a circumference U of the respective pipe. The perforation zone may be placed with respect to an adjacent perforation zone on the side facing away from the adjacent perforation zone. When using inlet and outlet pipes arranged parallel or next to one another, it can therefore be advantageous that at least in one or both pipes the perforation zone is designed on one side, with the respective perforation zone being placed on the side facing away from the neighboring pipe in the case of a half-sided design. This means that larger distances between the perforation zones and the associated acoustic advantages are achieved.

In this regard, it can also be advantageous if the exhaust pipe has an exhaust flap which is arranged downstream of the outer wall of the housing, via which an exhaust gas flow that can be discharged directly into an environment can be regulated. By using an exhaust flap, the muzzle acoustics can be changed relatively significantly. When the exhaust flap is open, at least part of the exhaust flow escapes to the outside without passing through the exhaust silencer, which ensures a very sporty muzzle noise. When the exhaust flap is closed or at least partially closed, a correspondingly larger portion of the exhaust gas flow passes through the exhaust silencer, so that a very comfortable muzzle noise is achieved.

Furthermore, it can be advantageous if the inlet pipe and the outlet pipe are arranged at least partially next to one another and at a radial distance ar from one another. The inlet pipe described above and the outlet pipe are separate pipes that are arranged next to each other at a distance ar from each other. Regardless of this, the respective pipe, i.e. the inlet pipe or the outlet pipe, can be designed in several parts. But even in this case, the basic gas flow is decisive for the name of the respective pipe. An introduction and forwarding of the exhaust gas flow is effected through an inlet pipe, while an exit from the exhaust gas silencer and a previous forwarding to the corresponding outlet are accomplished through an outlet pipe. The use of an exhaust pipe that is connected directly to the inlet pipe does not fulfill at least the above-mentioned condition regarding the juxtaposition or the distance ar from the inlet pipe.

The advantages mentioned above are of course also achieved by an exhaust system with an exhaust silencer described above. Since the exhaust silencer described above is a rear silencer, only an exhaust tailpipe is provided downstream of the exhaust pipe or the exhaust flap, which does not significantly influence the desired mouth acoustics.

Advantageously, the exhaust silencer described above is designed as a rear silencer, so that only a silencer-free exhaust tailpipe is provided after the exhaust pipe, regardless of the exhaust flap.

• 1 bis 6 jeweils eine Prinzipskizze eines Abgasschalldämpfers in verschiedenen Ausführungsformen;
• 7 eine Querschnittdarstellung benachbarter Abgasrohre;
• 8 eine Prinzipskizze eines Abgasschalldämpfers mit Abgasendrohr;
• 9 eine Prinzipskizze einer Brennkraftmaschine mit einem Abgasschal ldäm pfer.

Further advantages and details of the invention are explained in the patent claims and in the description and shown in the figures. Show it:

• 1 until 6 each a schematic sketch of an exhaust silencer in different embodiments;
• 7 a cross-sectional view of adjacent exhaust pipes;
• 8th a schematic sketch of an exhaust silencer with exhaust tailpipe;
• 9 a schematic sketch of an internal combustion engine with an exhaust gas silencer.

After 1 an exhaust silencer 1 has an outer housing wall 1.1, which delimits a housing 1.2. A first intermediate wall 2.1 and a second intermediate wall 2.2 are provided within the housing 1.2, the first intermediate wall 2.1 together with the outer housing wall 1.1 delimiting a first chamber 3.1 at the end, while the second partition 2.2 delimits a third chamber 3.3 together with the outer housing wall 1.1 at the end. A second chamber 3.2 is provided between the two housing walls 2.1, 2.2. In contrast to the exemplary embodiment 3 until 6 is after off leadership example 1 a third intermediate wall 2.3 is provided, which in turn delimits the second chamber 3.2 together with the first intermediate wall 2.1 and the housing outer wall 1.1. In addition, the third intermediate wall 2.3, together with the second intermediate wall 2.2 and the housing outer wall 1.1, delimits a fourth chamber 3.4.

According to all exemplary embodiments 1 until 6 is generally an inlet pipe 4, which is guided through the outer housing wall 1.1 into the first chamber 3.1 and which, starting from the first chamber 3.1, is guided through the first intermediate wall 2.1 into the second chamber 3.2. In addition, all exemplary embodiments have in common an outlet pipe 6, which is guided through the outer housing wall 1.1 and through the third chamber 3.3 and which opens into the second chamber 3.2.

An exhaust pipe 5.1 connects to the inlet pipe 4 in the first chamber 3.1 and is guided through the first chamber 3.1 and through the outer housing wall 1.1 into an environment 10. In the outlet pipe 6, an exhaust gas flap 7 is placed downstream of the housing outer wall 1.1, via which an exhaust gas flow to be led into the environment 10 can be regulated.

According to the exemplary embodiment 1 the inlet pipe 4 is guided through the second chamber 3.2 and through the fourth chamber 3.4 and opens into the third chamber 3.3 with an end pipe opening. Both in the second chamber 3.2 and in the fourth chamber 3.4, the inlet pipe 4 has a perforation zone PE2, PE3, via which the inlet pipe 4 is coupled to the second chamber 3.2 or to the fourth chamber 3.4. The outlet pipe 6 also has a perforation zone PA3, which is placed in the fourth chamber 3.4 and thus couples the fourth chamber 3.4 to the outlet pipe 6. The outlet pipe 6 opens into an end pipe opening within the second chamber 3.2.

The first intermediate wall 2.1 is provided with a perforation zone PZ1, whereby the first chamber 3.1 is coupled to the second chamber 3.2.

The exhaust gas flow within the outlet pipe 6 or the inlet pipe 4, as far as they extend through the various chambers 3.2-3.4, is based on a main flow direction S of the exhaust gas. With reference to this flow direction S, all four chambers are arranged in series, i.e. one after the other. The respective partition walls 2.1-2.3 therefore represent partition walls between the different chambers 3.1-3.4. The outlet pipe 6 is arranged at a distance ar from the inlet pipe 4 and runs next to the inlet pipe 4. The outlet pipe 6 and inlet pipe 4 can be arranged parallel or skewed to one another. Of essential importance for the mouth acoustics is the distance ar, which can also vary in relation to the direction of flow S.

The exemplary embodiment according to 2 initially differs from the one after 1 in that the inlet pipe 4 opens into the end pipe opening within the second chamber 3.2. In addition, a sound pipe 5.2 is provided, which is guided from the second chamber 3.2 through the fourth chamber 3.4 and opens into the third chamber 3.3 via the end pipe opening. The sound tube 5.2 has a perforation zone PE3 within the fourth chamber 3.4, via which it is coupled to the fourth chamber 3.4. The inlet pipe 4 and the sound pipe 5.2 can be arranged coaxially with one another. A parallel arrangement, which at least ensures coverage of the respective end-side, opposite pipe opening, is also sufficient. Due to this overlap, a flow on the sound tube 5.2 is advantageous in its function as a Helmholtz tube for the flow on the Helmholtz chamber 3.3.

While according to embodiment 1 the first intermediate wall 2.1 has the perforation zone PZ1, according to the exemplary embodiment 2 the third partition 2.3 has a perforation zone PZ3.

According to the following exemplary embodiments 3 until 6 the third partition 2.3 is not provided. The second chamber 3.2 is therefore delimited by the first intermediate wall 2.1 and the second intermediate wall 2.2. The outlet pipe 6 opens within the second chamber 3.2 and is coupled to the second chamber 3.2, on the one hand via the end pipe opening and via the perforation zone PA3. The inlet pipe 4 in turn opens into the end pipe opening within the second chamber 3.2. In addition, the sound tube 5.2 is provided at an axial distance ar, which opens into the third chamber 3.3 as well as the second chamber 3.2 with the respective end-side tube opening. As per the exemplary embodiment 1 the first intermediate wall 2.1 has a perforation zone PZ1, which couples the first chamber 3.1 to the second chamber 3.2. In addition, the second intermediate wall 2.2 has a perforation zone PZ2, which couples the second chamber 3.2 to the third chamber 3.3.

According to the exemplary embodiment 4 is in contrast to the exemplary embodiment 3 the inlet pipe 4 is guided from the first chamber 3.1 to the third chamber 3.3. Within the second chamber 3.2, the inlet pipe 4 has a perforation zone PE2, via which it is coupled to the second chamber 3.2. The outlet pipe 6 has no perforation zone in the second chamber 3.2 and is only coupled to the second chamber 3.2 via the end pipe opening.

The inlet pipe 4 has a perforation zone PE1 within the first chamber 3.1, via which it is coupled to the first chamber 3.1. The perforation zone PE1 can be divided into several sections or segments. The same applies to the perforation zone PE2 within the inlet pipe 4 or to the perforation zone PE3 within the outlet pipe 6.

The exemplary embodiment 5 largely corresponds to that of the embodiment 3 . The inlet pipe 4 also opens into the second chamber 3.2. However, the coupling only takes place via the end pipe opening without using a perforation zone. Both the outlet pipe 6 and the sound pipe 5.2 are shortened and end directly in the area of the second partition 2.2.

The different perforation zones within the different partition walls 2.1-2.3 can be combined differently. In addition to the embodiments set out here, other variations are also possible. This also applies to the use of perforation zones within the inlet pipe 4 or the outlet pipe 6, as far as the coupling of the respective pipe to one of the chambers is concerned.

The perforation zone PZ2 within the second intermediate wall 2.2 is only for the embodiment 2 , 3 and 4 shown. The perforation of the first intermediate wall 2.1, i.e. the perforation zone PZ1, is only for the embodiment 1 and 3 to 6 shown. The perforation of the third intermediate wall 2.3 is only an example in the exemplary embodiment 2 shown. Other variations are also possible in this regard.

According to the exemplary embodiment 7 the perforation zone PE3 of the inlet pipe 4 is formed on one side, i.e. only over a circumference U and an angular section A of approximately 150°, and is arranged on the side of the respective pipe 4 opposite the pipe 6. It is also possible that, additionally or alternatively, the tube 6 is only perforated on one side and this perforation zone PA3 is arranged on the side facing away from the tube 4.

8th shows the exhaust silencer 1 with the outer housing wall 1.1 and the outwardly guided exhaust pipe 5.1 with the exhaust flap 7. Following the exhaust pipe 5.1, an exhaust tailpipe 9 is provided, via which the exhaust gas flow is directed into an environment 10.

After 9 is sketched an internal combustion engine 11 with an exhaust pipe 11.1, in which an exhaust silencer 1 is integrated as described above. Starting from the exhaust silencer 1, the exhaust gas is passed on to an environment 10 via the exhaust tailpipe 9.

Reference symbol list

1

Exhaust silencer

1.1

Housing outer wall

1.2

Housing

2.1

first partition wall

2.2

second partition wall

2.3

third partition wall

3.1

first chamber, absorption chamber

3.2

second chamber, expansion and reflection chamber

3.3

third chamber, Helmholtz Chamber

3.4

fourth chamber, absorption chamber

4

inlet pipe

5.1

exhaust pipe

5.2

sound tube

6

outlet pipe

7

Exhaust flap

8th

Absorbents

9

Exhaust tailpipe, silencer-free exhaust pipe

10

Vicinity

11

Internal combustion engine

11.1

Exhaust pipe

A

Angle section

ar

radial distance

PE1

Perforation zone inlet pipe

PE2

Perforation zone inlet pipe

PE3

Perforation zone inlet pipe, sound pipe

PA3

Perforation zone outlet pipe

PZ1

Perforation zone partition wall

PZ2

Perforation zone partition wall

PZ3

Perforation zone partition wall

S

Direction of flow

U

Scope

Claims (16)

Exhaust gas silencer (1) for an exhaust system of an internal combustion engine with a housing (1.2) having an outer housing wall (1.1), with a first intermediate wall (2.1) arranged in the housing (1.2) and with a second intermediate wall (2.2) arranged in the housing (1.2). ), which divide the housing (1.2) into a first chamber (3.1), a second chamber (3.2) and a third chamber (3.3), with an inlet pipe (4) which runs from the outside through the outer housing wall (1.1) into the first Chamber (3.1) is guided and is coupled to the second chamber (3.2), and with an exhaust pipe (5.1) which is guided from the outside through the housing outer wall (1.1) into the first chamber (3.1), the first chamber (3.1 ) is filled with absorbent (8) and designed as an absorption chamber and the third chamber (3.3) is designed as a Helmholtz chamber, an outlet pipe (6) being provided which is guided through the third chamber (3.3) and in the second chamber (3.2 ) opens, characterized in that the exhaust pipe (5.1) is coupled to the inlet pipe (4) in the first chamber (3.1). Exhaust silencer (1). Claim 1 , characterized in that the inlet pipe (4) is guided through the first chamber (3.1) and opens into the second chamber (3.2) or into the third chamber (3.3) and that when it opens into the second chamber (3.2) a sound pipe ( 5.2) is provided, which is guided from the second chamber (3.2) into the third chamber (3.3). Exhaust silencer (1). Claim 2 , characterized in that a third intermediate wall (2.3) is provided which delimits the second chamber (3.2) and forms a fourth chamber (3.4) between the second chamber (3.2) and the third chamber (3.3) within the housing (1.2). , wherein the inlet pipe (4) or the sound pipe (5.2) is guided through the fourth chamber (3.4) and opens into the third chamber (3.3). Exhaust silencer (1) according to one of the preceding claims, characterized in that the inlet pipe (4) and/or the exhaust pipe (5.1) has a perforation zone PE1, via which the inlet pipe (4) and/or the exhaust pipe (5.1) is connected to the first Chamber (3.1) is coupled. Exhaust gas silencer (1) according to one of the preceding claims, characterized in that the outlet pipe (6) has a perforation zone PA3 in the second chamber (3.2) or in the fourth chamber (3.4). Exhaust gas silencer (1) according to one of the preceding claims, characterized in that the inlet pipe (4) has a perforation zone PE2 in the second chamber (3.2) and/or a perforation zone PE3 in the fourth chamber (3.4). Exhaust silencer (1) according to one of the preceding claims, characterized in that the housing (1.2) comprises an exhaust silencer volume of 27 liters to 36 liters, the first chamber (3.1) comprising a volume of 7 liters to 15 liters and/or the second Chamber (3.2) has a volume of 5 liters to 12 liters and / or the third chamber (3.3) has a volume of 8 liters to 15 liters. Exhaust silencer (1) according to one of the preceding claims, characterized in that the inlet pipe (4) has an inner diameter between 70 mm and 90 mm and/or that the exhaust pipe (5.1) has an inner diameter between 60 mm and 75 mm and/or that the outlet pipe (6) has an inner diameter between 50 mm and 65 mm. Exhaust gas silencer (1) according to one of the preceding claims, characterized in that the first partition (2.1) and/or the third partition (2.3) has a wall surface and a perforation zone PZ1, PZ3, an opening cross section of the perforation zone PZ1, PZ3 being a maximum of 70%. of the respective wall surface. Exhaust silencer (1) according to one of the preceding claims, characterized in that the second intermediate wall (2.2) has a wall surface and a perforation zone PZ2, an opening cross section of the perforation zone PZ2 being a maximum of 70% of the wall surface, or that the third chamber (3.3). Except for the coupling of the inlet pipe (4) or the sound pipe (5.2) is decoupled. Exhaust silencer (1) according to one of the preceding claims, characterized in that the chambers (3.1, 3.2, 3.4, 3.3) are arranged one after the other in series with respect to a flow direction S of the exhaust gas in the inlet pipe (4) or in the outlet pipe (6). Exhaust gas silencer (1) according to one of the preceding claims, characterized in that at least one of the perforation zones PE1 - PE3, PA3 is limited to an angular section (A) in relation to a circumference U of the respective pipe (4, 5.2, 6). 150° and 210°. Exhaust silencer (1) according to one of the preceding claims, characterized in that the exhaust pipe (5.1) has an exhaust flap (7) which is located downstream of the housing outer wall (1.1) is arranged, via which an exhaust gas flow that can be discharged directly into an environment (10) can be regulated. Exhaust gas silencer (1) according to one of the preceding claims, characterized in that the inlet pipe (4) and the outlet pipe (6) run at least partially next to one another and are arranged at a radial distance (ar) from one another. Exhaust system of an internal combustion engine with an exhaust silencer (1) according to one of the preceding claims. exhaust system Claim 15 , characterized in that a silencer-free exhaust tailpipe (9) is coupled directly to the exhaust pipe (5.1).