DE102011011060A1 - Silencer for use in exhaust system for attenuation of sound waves produced by combustion engine of e.g. motorcycle, has inner pipe provided within hollow body that is provided with recesses covered by cover - Google Patents

Abstract

The silencer has a hollow body i.e. stabilization pipe (1), provided with multiple recesses that are covered by a cover (2), where the pipe is closed with a cap (6) at an upstream end of the silencer. The cover is formed as a film in a tubular-shape, so that stretchability of the body is smaller than stretchability of the cover. An inner pipe is provided within the hollow body. The cover is made from high temperature-stable plastic such as polyetheretherketone (PEEK). The body is formed in a tubular or funnel-shape and made of metal or a highly temperature-stable plastic such as PEEK.

Description

Technical area

The invention relates to a silencer, which serves for example for damping the sound waves generated by an internal combustion engine. The muffler can be used inter alia in the exhaust system of motor vehicles and in particular of motorcycles.

State of the art

Increasingly stringent noise regulations are forcing vehicle manufacturers to use larger and more efficient silencers. However, this has the consequence that the mufflers are heavier, which in turn has a negative effect on the dynamic characteristics of the vehicle. This is especially true in the motorcycle sector. In addition, the entire vehicle is heavier, which also brings environmental disadvantages, such as increased fuel consumption.

Presentation of the invention

An object of the invention is to provide a silencer that is extremely lightweight yet meets the increasing damping requirements.

Advantageously, the muffler is also permanently operable at high temperatures.

Another advantage of the inventive muffler is that it is also very good mechanical strength. Thus, the wear is minimal even with highly dynamic forces.

The object is achieved by a muffler with the features specified in claim 1.

The inventive muffler has a hollow body with recesses and at least one cover, which covers the recesses. In addition, it is provided that the extensibility of the hollow body is smaller than the extensibility of the cover. Within the hollow body, an inner tube is provided.

The object is also achieved by a muffler with the features specified in claim 12.

The inventive muffler has a hollow body and in the hollow body an inner tube with beads. Within the beads holes are provided in the wall of the inner tube.

In addition, the object is also achieved by a muffler with the features specified in claim 19.

The inventive muffler has a hollow body with recesses. In addition, the muffler in the hollow body comprises an inner tube with arranged in the wall of the inner tube openings, wherein the openings and the recesses are matched.

Advantageous developments of the invention will become apparent from the features indicated in the dependent claims.

In one embodiment of the inventive silencer, the cover is formed as a film. As a result, additional weight can be saved. The entire muffler is even lighter.

In a further embodiment of the inventive silencer, the cover is tubular. In this way, the cover can be easily pushed into the cavity or over the cavity. This facilitates and simplifies the production of the silencer.

In a further development of the inventive silencer, the cover is arranged within the hollow body.

In another development of the inventive silencer, the cover is arranged outside the hollow body.

In addition, the cover may be arranged in the inventive silencer at a defined distance from the hollow body.

In addition, it can be provided in the inventive silencer, that the cover has a high temperature resistant plastic.

For example, the cover may be made of polyetheretherketone (PEEK). This makes the cover both high temperature resistant and extremely lightweight. But that does not mean that the cover is made exclusively of PEEK. It can also contain other components.

The hollow body of the inventive muffler may be formed, for example tubular or funnel-shaped. With the geometry of the funnel shape, the flow rate and the gas pressure can be adjusted.

In one embodiment of the inventive muffler, the hollow body is made of metal or a high temperature resistant plastic. Again, the hollow body does not have to be made entirely of metal. It may well be installed even more materials in the hollow body. The same applies mutatis mutandis to the case that the hollow body is made of high temperature resistant plastic such as PEEK. This is to express that the high temperature resistant plastic can be one of several materials used to make the cavity. Composite materials such as fiber-reinforced PEEK can also be used for the construction of the hollow body. The combination of fibers and PEEK makes the hollow body particularly robust.

In another embodiment of the silencer according to the invention, the hollow body comprises polyetheretherketone. As a result, the hollow body is both high temperature resistant and extremely lightweight.

In a development of the inventive silencer is provided that the beads are arranged on the outside of the inner tube.

In another development of the inventive silencer is provided that the beads are arranged on the inside of the inner tube.

Finally, it can also be provided in the inventive silencer that the beads are arranged on the inside and the outside of the inner tube.

In the case of the silencer according to the invention, the holes can be arranged in groups. In this way, an additional adaptation of the muffler to the engine characteristics is possible.

It can also be provided that the holes in the inner tube of the muffler are distributed over a certain portion of the inner tube.

Advantageously, the holes are arranged evenly distributed on the circumference of the inner tube in the inventive silencer.

In the case of the silencer according to the invention, the arrangement of the openings and the arrangement of the recesses can be coordinated with one another. This optimizes the attenuation of the sound waves.

Finally, it can also be provided in the inventive silencer, the size and / or the number of openings and the size and / or the number of recesses are coordinated. Even with this, the attenuation of the sound waves can be optimized.

Brief description of the drawings

In the following, the invention will be explained in more detail with reference to eight figures.

1a shows a possible embodiment of the inventive silencer in a three-dimensional view.

1b shows the embodiment of the inventive silencer in a further three-dimensional view.

2a shows the inventive silencer in an exploded view.

2 B shows the inventive silencer in the side view in a partial exploded view.

3 shows the end portion of the muffler in an enlarged exploded view.

4 shows the outlet of the inner tube and a portion of the cover in an enlarged three-dimensional view.

5a shows a possible embodiment of the inner tube in the side view.

5b shows the outlet of the inner tube in a three-dimensional view.

6a shows the inner tube together with a cap at the outlet and a flexible connection tube at the inlet in a three-dimensional view.

6b shows the inner tube together with the cap at the outlet and the connection tube at the inlet in another three-dimensional view.

7a shows a possible embodiment of the stabilization tube in a three-dimensional view.

7b shows the stabilization tube in the side view.

7c shows the stabilization tube in plan view.

8a shows a further possible embodiment of the stabilization tube in a three-dimensional view.

8b shows the stabilization tube in the front view.

8c shows the stabilization tube in the side view.

Ways to carry out the invention

The inventive muffler has a hollow body with recesses and at least one cover, which covers the recesses. Within the hollow body, an inner tube is provided.

1a shows a possible embodiment of the inventive silencer in a first three-dimensional view and 1b shows the muffler in another three-dimensional view. 2a shows the inventive silencer in an exploded view. 2 B shows the inventive silencer in the side view in a partial exploded view. 3 shows the end portion of the muffler in an enlarged exploded view.

The silencer includes a stabilization tube 1 , which is also referred to below as a jacket tube. The stabilization tube 1 is a possible embodiment of the hollow body. In the following, the term pipe is to be understood as a hollow body whose length is greater than its width and / or height or diameter. A pipe, as it should be understood here, can have a variety of cross-sections, such as round or square. The cross-section does not have to be constant over the length of the pipe, but may also vary. Seen downstream, it has several recesses on its right side 1.1 to 1.4 and on its left side several recesses 1.10 to 1.13 on. The recesses 1.1 and 1.10 are symmetrical to each other. The same applies in each case for the recesses 1.2 and 1.11 , the recesses 1.3 and 1.12 and the recesses 1.4 and 1.13 , The recesses 1.10 and 1.11 however, they have different shapes. Basically, all recesses in the stabilization tube 1 have different shapes. Also, the number of recesses may vary from case to case.

Approximately in the middle of the stabilization tube 1 there is a holder 1.20 with a hole 1.21 , About the bracket 1.20 For example, the muffler may be attached to a vehicle (not shown in the figures). Of course, the holder 1.20 optional and can be designed differently if necessary. For example, it is also possible to form the holder as a pipe clamp.

The stabilization tube 1 can be made of a metallic or non-metallic material or a combination of both. As a non-metallic material, for example, fiber-reinforced polyetheretherketone can be used. The stabilizing tube made with this material 1 is both high temperature resistant and extremely light.

That in the 1a to 3 Stabilization tube shown 1 has a cross-section which is substantially constant over the length of the stabilization tube. However, this is not mandatory.

At the upstream end of the muffler is the stabilizing tube 1 with a cap 6 completed. The cap 6 has an inlet opening into which a connection pipe 4 empties. Via the connecting pipe 4 the exhaust gases from the engine of the vehicle reach the inside of the silencer.

At the downstream end of the muffler is the stabilizing tube 1 with another cap 5 completed. The cap 5 has an outlet opening 5.1 on, so that the exhaust gases can escape from the muffler again.

The muffler also includes another tube 2 , which is referred to below as another jacket tube or cover tube. The other tube 2 is a possible embodiment of the above-mentioned cover. Like from the 1a and 1b can be seen, covers the other tube 2 the recesses 1.1 to 1.13 of the stabilizing tube 1 from. This ensures, inter alia, that a closed cavity within the stabilizing tube 1 arises. The stabilization tube 1 absorbs the static and dynamic forces that arise during operation of the vehicle. It can be optimized in this respect as well as in terms of its weight. The other tube 2 It does not need to take up any load-bearing forces, but instead ensures that the exhaust gases do not flow laterally through the recesses 1.1 to 1.13 can escape.

The other tube 2 can also take on a sound-absorbing function. For this purpose, it is provided that the extensibility of the other tube 2 greater than the extensibility of the stabilizing tube 1 , If elasticity is mentioned below, it is preferably the extensibility of the respective material or material in the elastic region. In other words, the elastic modulus E1 of the stabilizing tube 1 is preferably greater than the elastic modulus E2 of the other tube 2 , Is exhaust gas under pressure in the muffler passed, the tube can 2 in the recesses 1.1 to 1.13 expand while the stabilization tube 1 largely remains dimensionally stable. This effect can be used to reduce the sound pressure of the exhaust gas. The flow direction of the exhaust gas is indicated by the two arrows in 1a characterized.

The other tube 2 can be made of a metallic or non-metallic material or a combination of both. As a non-metallic material, for example, polyimide (PI), polyetherimide (PEI) or polyetheretherketone can be used. The other tube made with this material 2 is both high temperature resistant and extremely light.

For example, the above-mentioned material can be rolled up into a tube as a film having a thickness of 1 mm or less, and then forms the other tube 2 ,

The other tube 2 does not necessarily have to be inside the stabilization tube 1 be arranged. Instead, it can also be the stabilization tube 1 surrounded outside. The other tube 2 does not necessarily have to be a pipe. It may be advantageous if only the recesses 1.1 to 1.13 of the stabilization tube 1 be covered. The corresponding covers may be in size and shape to the recesses 1.1 to 1.13 of the stabilization tube 1 be adjusted and inside or outside the stabilization tube 1 be arranged. The covers or the cover tube 2 can also be at a defined distance to the stabilization tube 1 be arranged.

Inside the muffler is an inner tube 3 (please refer 2a ). The inner tube 3 is at its upstream end with the connection pipe 4 connectable. At its downstream end is an outlet 3.1 for the exhaust. The outlet 3.1 flows into the outlet 5.1 the cap 5 , which is also the outlet of the entire silencer. In addition, the inner tube 3 in its wall a series of openings 3.2 and 3.3 on (see 3 . 4 . 5a . 5b . 6a and 6b ).

The inner tube 1 can, like the pipes 1 and 2 , be made of a metallic or non-metallic material or a combination of both. As a non-metallic material, for example, polyetheretherketone can be used. The inner tube made with this material 1 is both high temperature resistant and extremely light.

To assemble the muffler, first the cap 5 at the downstream end of the inner tube 3 appropriate. This can be attached to the inner tube 3 for example, riveted or welded. 6a shows the inner tube 3 together with the cap 5 in a first three-dimensional view and 6b shows the inner tube 3 together with the cap 5 in another three-dimensional view. Subsequently, the other tube 2 and the inner tube 3 in the stabilization tube 1 pushed. The cavity between the inner tube 3 and the other tube 2 can be filled with a sound absorbing material (not shown in the figures). As sound-insulating material, for example, glass wool can be used. Finally, the cap 6 on the stabilization tube 1 and on the inner tube 3 attached. The cap 6 can on the stabilization tube 1 and / or the inner tube 3 for example, riveted, welded or screwed. If it should be possible to easily replace the sound insulation material, it is advantageous to the cap 6 on the inner tube 3 or the stabilizing tube 1 screwed. It can also be provided that the inlet pipe 4 on the inner tube 3 is screwed (see 6a and 6b ) and the cap 6 while one on the inlet pipe 4 located stop on the stabilizing tube 1 is pressed.

The inlet pipe 4 can be designed as a flexible tube.

4 shows the outlet 3.1 of the inner tube 3 and the downstream end 2.1 the other tube 2 in an enlarged three-dimensional view. In 5a is a possible embodiment of the inner tube 3 shown in the side view. The in the wall of the inner tube 3 located holes 3.2 and 3.3 are at the in 5a shown embodiment in groups 3.4 . 3.5 to 3.10 arranged. However, this is not mandatory. The distribution of the holes in the wall of the inner tube 3 can be tuned to the engine of the vehicle and its engine characteristics.

The inner tube 3 can bead on its outside 3.22 each having a hole 3.2 within one of these beads 3.22 is arranged. Alternatively or additionally, the inner tube 3 can also bead on its inside 3:33 each having a hole 3.3 within one of these beads 3:33 is arranged. The shape of the beads can, as in 5 is shown to be round in plan view. Instead, however, triangular, square or polygonal beads are also possible. In addition, it is possible to combine the different beads together. The 5a and 5b show such a possible combination. In this embodiment, the inner beads alternate in the axial direction 3:33 with the outer beads 3.22 from. In addition, it can also be provided that is not in each of the beads 3.22 and 3:33 a hole 3.2 respectively 3.3 located. In 5a are the groups 3.4 to 3.10 arranged equidistantly to each other. The distance of the groups 3.4 to 3.10 but they can also be different.

In the following, a bulge or accumulation of material in the wall of the inner tube becomes a bead 3 Understood. The bead emerges from the otherwise smooth surface of the inner tube 3 out. In plan view, for example, it has a round or polygonal shape.

In 7a is another possible embodiment of a stabilization tube 10 in a three-dimensional view and in 7b shown in the side view. 7c shows the stabilization tube 10 in the plan view. The stabilization tube 10 is different from the one in the 1 to 3 shown stabilization tube 1 through the shape of its recesses 10.1 to 10:13 ,

In 8a is another possible embodiment of a stabilization tube 20 in a three-dimensional view and 8b shown from the front. 8c shows the stabilization tube 20 in the side view. The stabilization tube 20 is different from the one in the 1 to 3 shown stabilization tube 1 by its shape and additionally by the shape of its recesses 20.1 to 20:13 , The stabilization tube 20 has a pentagonal cross section and inlet side a smaller cross section than the outlet side and thus the shape of a funnel. In this way, the flow velocity and the pressure of the exhaust gases can be changed. Thus, the exhaust gas flows faster at the inlet than at the outlet. For this, the exhaust pressure at the inlet is smaller than that at the outlet of the pipe 20 or the muffler.

The foregoing description of the embodiments according to the present invention is for illustrative purposes only, and not for the purpose of limiting the invention. Various changes and modifications are possible within the scope of the invention without departing from the scope of the invention and its equivalents. For example, the different in the 7a . 7b and 7c such as 8a . 8b and 8c shown stabilization tubes 10 respectively 20 also for the one in the figures 1a . 1b . 2a and 2 B shown used silencer. The in the 1 to 8th Components shown can also be combined with each other in a different manner as shown in the figures.

LIST OF REFERENCE NUMBERS

1

casing pipe

1.1-1.13

recesses

1.20

bracket

1.21

drilling

2

casing pipe

2.1

tube outlet

3

inner tube

3.1

outlet

3.2

radial opening

3.3

radial opening

3.4

group

3.5

group

3.6

group

3.10

group

3.22

bead

3:33

bead

4

inlet pipe

5

Cap at the outlet

5.1

outlet

6

Cap at the inlet

10

Casing pipe or stabilization pipe

10.1-10.13

recesses

20

Casing pipe or stabilization pipe

20.1-20.13

recesses

Claims (21)

Silencer, in which a hollow body ( 1 ) with recesses ( 1.1 - 1.13 ) is provided, - in which at least one cover ( 2 ) is provided, which the recesses ( 1.1 - 1.13 ), - in which the extensibility of the hollow body ( 1 ) smaller than the extensibility of the cover ( 2 ), and - in which within the hollow body ( 1 ) an inner tube ( 3 ) is provided. Silencer according to claim 1, wherein the cover ( 2 ) is formed as a film. Silencer according to claim 1 or 2, wherein the cover ( 2 ) is tubular. Silencer according to one of the preceding claims, wherein the cover ( 2 ) within the hollow body ( 1 ) is arranged. Silencer according to one of claims 1 to 3, in which the cover ( 2 ) outside the hollow body ( 1 ) is arranged. Silencer according to one of the preceding claims, wherein the cover ( 2 ) at a defined distance from the hollow body ( 1 ) is arranged. Silencer according to one of the preceding claims, wherein the cover ( 2 ) has a high temperature resistant plastic. Silencer according to one of the preceding claims, wherein the cover ( 2 ) Polyetheretherketone. Silencer according to one of the preceding claims, in which the hollow body ( 1 ) is tubular or funnel-shaped. Silencer according to one of the preceding claims, wherein the hollow body ( 1 ) Metal or a high temperature resistant plastic. Silencer according to one of the preceding claims, wherein the hollow body ( 1 ) Polyetheretherketone. Silencer, in which a hollow body ( 1 ) is provided, - in which in the hollow body ( 1 ) an inner tube ( 3 ) with beads ( 3.7 . 3.8 ), and - in which within the beads ( 3.7 . 3.8 ) Holes ( 3.2 . 3.3 ) in the wall of the inner tube ( 3 ) are provided. A silencer according to claim 12, wherein the beads ( 3.7 ) on the outside of the inner tube ( 3 ) are arranged. A silencer according to claim 12, wherein the beads ( 3.8 ) on the inside of the inner tube ( 3 ) are arranged. A silencer according to claim 12, wherein the beads ( 3.7 . 3.8 ) on the inside and the outside of the inner tube ( 3 ) are arranged. Silencer according to one of the claims 12 to 15, in which the holes ( 3.2 . 3.3 ) in groups ( 3.4 . 3.5 . 3.6 ) are arranged. Silencer according to one of the claims 12 to 16, wherein the holes ( 3.2 . 3.3 ) over a certain section of the inner tube ( 3 ) are arranged distributed. Silencer according to one of the claims 12 to 16, wherein the holes ( 3.2 . 3.3 ) on the circumference of the inner tube ( 3 ) are arranged evenly distributed. Silencer, in which a hollow body ( 1 ) with recesses ( 1.1 - 1.10 ) is provided, - in which in the hollow body ( 1 ) an inner tube ( 3 ) with in the wall of the inner tube ( 3 ) arranged openings ( 3.2 . 3.3 ), and - in which the openings ( 3.2 . 3.3 ) and the recesses ( 1.1 - 1.10 ) are coordinated. Silencer according to claim 19, wherein the arrangement of the openings ( 3.2 . 3.3 ) and the arrangement of the recesses ( 1.1 - 1.10 ) are coordinated. Silencer according to claim 19 or 20, in which the size and / or the number of openings ( 3.2 . 3.3 ) and the size and / or the number of recesses ( 1.1 - 1.10 ) are coordinated.

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