DE20115656U1 - Exhaust system for a motor vehicle - Google Patents

Description

Exhaust system for a motor vehicle

The invention relates to an exhaust system for a motor-driven motor vehicle with an exhaust gas-carrying line system which contains at least two strands, in each of which at least one unit of the exhaust system is arranged.

In the exhaust gas pipe system of an exhaust system for a motor vehicle powered by an internal combustion engine, there are usually several units connected in series or in parallel, for example silencers, catalytic converters and, if necessary, soot filters. These units are each housed in a housing. In many cases it is necessary to divide the exhaust gas into several parallel lines and, if necessary, to bring them back together again, with an exhaust gas treatment unit arranged in each of these lines. The units arranged in different lines can also differ from one another in the way they function, for example to enable exhaust gas treatment that is adapted to the respective operating state by distributing the exhaust gas differently between these lines depending on the load (full throttle, partial load or idling).

A separate housing is now provided for each of these units and for any branches that may be required, whereby the identical housings used for functionally identical units in different branches are spatially separated from one another. This is due to the large number of parts and assemblies required in this case to manufacture the exhaust system.

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steps are complex and involve high production and storage costs.

The invention is based on the object of specifying an exhaust system for a motor-driven vehicle with a multi-strand exhaust gas-carrying line system, the assembly of which is simplified and which is therefore more cost-effective to manufacture.

The above object is achieved according to the invention by an exhaust system with the features of claim 1. According to these features, in an exhaust system whose exhaust gas-carrying line system contains at least two strands, in each of which an aggregate for exhaust gas treatment is arranged, at least one housing part is provided which is composed of two, preferably identically constructed housing half-shells and serves to accommodate aggregates of different strands which are connected on the inlet and/or outlet side to a pipe branch formed in the housing part.

By accommodating several units in a housing part composed of housing half shells and by integrating the pipe branch or pipe branches into the housing part, the number of assembly elements and assembly steps required to manufacture the exhaust system is reduced. Further advantageous embodiments of the invention are set out in the subclaims.

For further explanation of the invention, reference is made to the embodiment of the drawing. Shown are:

Fig. 1 shows a section of an exhaust system with a housing part according to the invention in a cross section,

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3
Fig. 2 a side view of the housing part,

Fig. 3 a cross section through the housing part.

According to Fig. 1, a pipe system 2 of an exhaust system contains two branches 2a,b, which originate from an internal combustion engine not shown in the figure. A unit 4a or b is installed in each of these branches 2a,b. The units 4a, b are used for exhaust gas treatment, for example to reduce pollutant or noise emissions. In the example in the figure, the units 4a,b are tubular bodies which have a large number of holes 40 in their casing and serve as silencers. In the example, the units 4a,b are functionally identical, i.e. have an identical structure. In principle, the units can also differ in terms of their functionality. For example, the sound-damping unit 4a can work according to different principles than the sound-damping unit 4b.

which contains two spatially separated receiving chambers 8a,b for receiving the aggregates 4a and b, respectively.

The receiving chambers 8a,b are each provided with opposing neck-like inlet and outlet openings 10a,b and 12a,b, respectively, which simultaneously serve as cylindrical bearing surfaces 14a,b and 16a,b, respectively, into which the tubular units 4a,b are embedded with their ends.

In the housing part 6, a pipe branch 18 (pipe hose) is formed, the legs 18a,b of which connect to the neck-like outlet openings 12a,b of the receiving chambers 8a,b, so that the exhaust gas A flowing in the units 4a,b is fed to a common, also

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in the housing part 6 formed connecting piece 20. By integrating the pipe branch 18 into the housing part 6, the number of required components is further reduced and assembly is made easier.

In the area of the inlet openings 10a,b, the housing part 6, the units 4a,b and the exhaust pipes 24a,b of the respective strands 2a and b opening into the housing part 6 are welded together.

In the area of the outlet openings 12a,b, the bearing surfaces 16a,b are each provided with a circumferential groove 26a,b into which a spacer element 28a,b is inserted. This serves to center the tubular units 4a,b and keeps them at a distance from the bearing surfaces 16a,b. In the exemplary embodiment, a wire mesh is provided as the spacer element 28a,b, which has a vibration-damping effect in the radial direction and at the same time forms a sliding seat in the axial direction. In other words: the tubular units 4a,b are mounted on one side, in the example on their outlet side, in a floating or sliding manner in the housing part 6.

The cavity of the receiving chambers 8a and 8b surrounding the tubular units 4a, b is filled with a sound-absorbing filler 22, for example glass wool.

The housing part 6 is composed of two identical housing half-shells 62, 64, each of which is provided at its edge with a circumferential mounting flange 66 or 68, which is only interrupted in the inlet and outlet areas, to which the housing half-shells 62, 64 are connected to one another by suitable joining methods, preferably by folding.

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According to Fig. 3, each housing half-shell has a number of chamber-like recesses 72a,b or 74a,b corresponding to the number of units 4a,b to be accommodated, which are separated from one another by a connecting web 82, 84 located in the parting plane 80 of the housing half-shells 62, 64, wherein these also extend in particular in the axial direction over the entire space between the recesses 70a,b and 72a,b. These connecting webs 82, 84 rest on one another in the final assembled state and can additionally be connected to one another, for example by spot welding. In the assembled state, the recesses 72a,b and 74a,b form the receiving chambers 8a and b, respectively.

The invention is illustrated using a silencer as an example. The basic idea of the invention, namely arranging units from different strands in one housing part, can, however, also be used in a correspondingly adapted design for soot filters or catalytic converters. A pipe branch on the input side or pipe branches on the input and output sides can also be provided, which are integrated into the housing part. In a housing part in which a pipe branch is integrated on both the input and output sides, the number of components can be reduced from six (two for the pipe hoses and four for the housing half-shells) to two. If the housing half-shells are also constructed identically, only a single component needs to be kept in stock.

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List of reference symbols

2 Pipeline system 2a,b strand 4a,b Aggregat 6 Housing part 8a,b Recording chamber 10a,b Inlet opening 12a,b Outlet opening 14a,b; 16a,b Storage areas 18 Pipe branch 18a,b leg 20 Connection piece 22 filler 24a,b Exhaust pipe 26a,b Groove 28a,b Spacer element 40 Hole 62, 64 Housing half shell 66, 68 Mounting flange 72a,b; 74a,b deepening 80 Separation plane 82, 84 Connecting bridge

A exhaust

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Claims (13)

1. Exhaust system for a motor-driven motor vehicle with an exhaust gas-carrying line system ( 2 ) which contains at least two strands ( 2a , b), in each of which at least one unit ( 4a , b) is arranged, and which comprises at least one housing part ( 6 ) composed of two housing half-shells ( 62 , 64 ) for receiving units ( 4a , b) of different strands ( 2a , b), which are connected on the inlet and/or outlet side to a pipe branch ( 18 ) formed in the housing part ( 6 ). 2. Exhaust system according to claim 1, wherein the housing half shells ( 62 , 64 ) are identical in construction. 3. Exhaust system according to claim 2, wherein the housing half shells ( 62 , 64 ) are welded together. 4. Exhaust system according to claim 2 or 3, in which the housing half-shells ( 62 , 64 ) are each provided at their edge with a mounting flange ( 66 or 68 ) on which they lie on top of one another. 5. Exhaust system according to claim 4, wherein a circumferential mounting flange ( 66 , 68 ) is provided in each case. 6. Exhaust system according to one of claims 2 to 5, in which each housing half-shell ( 62 , 64 ) has a number of chamber-like recesses (72a, b, 74a, b) corresponding to the number of units ( 4a , 4b ) to be accommodated, which are separated from one another by a connecting web ( 82 , 84 ) lying in the parting plane ( 80 ) of the housing half-shells ( 62 , 64 ). 7. Exhaust system according to claim 4 or 5, wherein the housing half-shells ( 62 , 64 ) are connected to one another at the mounting flange ( 66 , 68 ) by folding. 8. Exhaust system according to claim 6 in conjunction with claim 7, wherein the housing half-shells ( 62 , 64 ) are connected to one another at the connecting webs by spot welds ( 82 , 84 ). 9. Exhaust system according to one of the preceding claims, in which the housing part ( 6 ) is welded in the mouth region to the units ( 4a , b) and to an exhaust pipe (24a , b) opening into the unit (4a, b) of the strand ( 2a or 2b ) respectively assigned to this unit ( 4a , b). 10. Exhaust system according to one of the preceding claims, in which the units ( 4 a, b) are mounted in the housing part ( 6 ) in a floating manner on one side in the longitudinal direction. 11. Exhaust system according to one of the preceding claims, in which the units ( 4a , b) are tubular and are embedded with their ends in cylindrical bearing surfaces (14a, b, 16a, b) of the housing part ( 6 ). 12. Exhaust system according to claim 11, wherein at least one of the cylindrical bearing surfaces ( 16 a, b) is provided with a circumferential groove ( 26 a or b) for receiving a spacer element ( 28 a or b). 13. Exhaust system according to one of the preceding claims, in which the unit ( 4 a, b) is a silencer and a cavity formed between the tubular unit ( 4 a, b) and the receiving chamber ( 8 a, b) formed by the chamber-like depressions (72a, b, 74a, b) is filled with a sound-damping filler.