EP2183473A2 - Élément de séparation pour l'installation de gaz d'échappement d'un véhicule automobile - Google Patents

Élément de séparation pour l'installation de gaz d'échappement d'un véhicule automobile

Info

Publication number
EP2183473A2
EP2183473A2 EP08784936A EP08784936A EP2183473A2 EP 2183473 A2 EP2183473 A2 EP 2183473A2 EP 08784936 A EP08784936 A EP 08784936A EP 08784936 A EP08784936 A EP 08784936A EP 2183473 A2 EP2183473 A2 EP 2183473A2
Authority
EP
European Patent Office
Prior art keywords
flow guide
decoupling element
bellows
guide parts
decoupling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08784936A
Other languages
German (de)
English (en)
Inventor
Jörg Hornung
Frank Martinek
Massimo Messina
Michael Pluschke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Witzenmann GmbH
Original Assignee
Witzenmann GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Witzenmann GmbH filed Critical Witzenmann GmbH
Publication of EP2183473A2 publication Critical patent/EP2183473A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • F01N13/1811—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration
    • F01N13/1816—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration the pipe sections being joined together by flexible tubular elements only, e.g. using bellows or strip-wound pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L51/00—Expansion-compensation arrangements for pipe-lines
    • F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
    • F16L51/03—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube comprising two or more bellows

Definitions

  • the present invention relates to a decoupling element for the exhaust system of a motor vehicle, in particular of a commercial vehicle, with an outer bellows and a flow guide arranged inside the bellows for a fluid flow flowing through the decoupling element.
  • decoupling elements for exhaust systems are now predominantly designed worldwide as non-gas-tight winding tubes. This leads to a leakage through the decoupling element, which entails corresponding disadvantages of exhaust pollution.
  • decoupling elements have disadvantages in terms of wear and life, since in particular change mechanical properties over the term due to heat stiffening, friction or the like.
  • gas-tight decoupling elements which regularly have an external (metal) bellows for this purpose.
  • decoupling elements are exposed to high flow velocities of the fluid flow (exhaust gas flow) guided through the decoupling element, so that a pronounced noise development results due to the large surface of the bellows, which is caused by corrugated sections thereof. For this reason, a good flow guidance within the bellows or within the decoupling element is necessary in order to reduce the averaged noise development.
  • Another approach is to provide internal braids of mesh material within the bellows. However, if they are too long, they can be unstable and in this way also have a negative effect on the desired decoupling.
  • the object of the invention is to further develop a decoupling element of the type mentioned at the outset in that a good flow guidance within the bellows is ensured in a simple and cost-effective manner in order to minimize noise developments, without the flexibility or decoupling effect of the decoupling element being impaired.
  • decoupling element with the features of claim 1.
  • Advantageous development of the decoupling element according to the invention are the subject of subclaims, the wording of which is incorporated by reference into the present description in order to avoid unnecessary text repetition.
  • a decoupling element for the exhaust system of a motor vehicle, in particular of a commercial vehicle, with an external bellows and a flow guiding device arranged inside the bellows is characterized in that the flow guiding device has a plurality of flow guide parts arranged essentially one behind the other in the axial direction of the decoupling element.
  • the created component is thus essentially characterized in that it consists of a (metal) bellows and a plurality of flow guide parts, which are arranged substantially one behind the other within the bellows.
  • the individual flow guide parts as eigensta- bile pipe segments (flame tubes) and / or liner or fabric material be formed. They are designed so short that they do not affect the mobility of the decoupling element.
  • the bellows may be modularly composed of a number of bellows segments. These can be welded together, for example, until the entire decoupling reaches a required length.
  • Each bellows module or segment may have its own flow guide, for example, in each bellows segment, a single flame tube may be arranged, which is formed only so long that it does not hinder a movement of the bellows or the BaIg- segment.
  • the individual flow guide parts of the bellows modules complement each other for the overall component to a quasi-continuous flow guidance.
  • a plurality of flow guide parts can be provided for each bellows module or bellows segment.
  • These may be spaced apart in the axial direction or may at least partially overlap in the axial direction.
  • the individual pipe segments or flame pipes can have a closed surface.
  • at least some pipe segments may also be perforated or studded, if this is desired for reasons of flow guidance (noise minimization).
  • a liner or braid material is used to guide the gas within the bellows or the bellows segments, this can in each case on one side, ie at its front end with respect to the flow direction through the Ankopp- lungselement or on both sides, ie incorporated or fixed at its front and rear ends.
  • connections of the flow guide parts to the bellows can be executed both positively, non-positively and cohesively.
  • the present invention achieves a flow optimization of the decoupling in the exhaust system, in particular for commercial vehicles while optimizing the leakage.
  • the leakage within the total exhaust system is reduced, at the same time the life of the decoupling element is optimized.
  • a flexible decoupling of the exhaust system of a motor vehicle can be realized as follows: A short decoupling element module (corresponding to a short bellows module or segment) is mounted on the input side together with its own flow guide, for example using a corresponding ferrule. Subsequently, the output side of said module is expanded so far that another module with its input side is available. The first decoupling element module is thus finished, and the output side of the first module is mounted to the input side of another module and then welded. This last step is repeated until the desired end length of the decoupling element is reached.
  • a short decoupling element module corresponding to a short bellows module or segment
  • the output side of said module is expanded so far that another module with its input side is available.
  • the first decoupling element module is thus finished, and the output side of the first module is mounted to the input side of another module and then welded. This last step is repeated until the desired end length of the decoupling element is reached.
  • Figure 1 is a schematic representation of a first embodiment of the decoupling element according to the invention in a longitudinal sectional view;
  • FIG. 2 shows a second embodiment of the decoupling element according to the invention in a longitudinal sectional view
  • FIG. 3 shows a third embodiment of the decoupling element according to the invention in a longitudinal sectional view
  • Figure 4 shows further embodiments of the decoupling element according to the invention in a longitudinal sectional view; and Figures 5 to 8 each show a further embodiment of the invention
  • the decoupling element 1 shows a partial longitudinal sectional view of a first embodiment of a decoupling element 1 according to the invention. Since the decoupling element 1 is constructed symmetrically with respect to its longitudinal axis L, in the present case only one half of the decoupling element 1 according to the invention is formed, as in the following FIGS. 2 to 4 shown.
  • the decoupling element 1 has an outer (metal) bellows 2 in the form of a bellows.
  • a flow guide device 3 is arranged, which is in the form of a plurality of flow guide parts 3.1, 3.2, which are arranged one behind the other in the axial direction of the decoupling element 1.
  • the flow parts 3.1, 3.2 are formed as tube segments or flame tubes.
  • the individual flow guide parts 3.1, 3.2 thus have a total of tapered cross-section in the flow direction S.
  • the individual flow guide parts 3.1, 3.2 are spaced apart in the longitudinal direction, ie, do not overlap each other.
  • the flow guide parts 3.1, 3.2 are essentially in or parallel to corrugated abradings. cut 2.1, 2.2 of the bellows 2 arranged. Since the bellows 2 and thus of the decoupling element 1 has a certain mobility in these areas, in particular transversely to its longitudinal axis L, the distance d thereof controllable from the wall of the bellows 2 via the radial extension component of the flow guide parts 3.1, 3.2 is selected such that the flow guide parts 3.1, 3.2 with their respective rear end on movements of the bellows 2 do not abut against the wall, which could lead to damage.
  • the flow guide parts 3.1, 3.2 By the flow guiding device 3, d. H. the flow guide parts 3.1, 3.2, a virtually optimal flow path is achieved by the decoupling element 1, without a liner material must be used in this costly manner.
  • the pipe segments 3.1, 3.2 ensure by their shape and arrangement that the fluid flow past the corrugated sections 2.1, 2.2 of the bellows 2, wherein due to the dimensions and arrangement of the pipe segments 3.1, 3.2 mobility of the bellows 2 is not impaired.
  • a flow guide part 3.1 or 3.2 is respectively assigned to a corrugated section 2.1, 2.2 of the bellows 2. This is defined upstream of the corrugated portion 2.1, 2.2 on the wall of the bellows 2 and has such a longitudinal extent in the flow direction S, that it fluidly covers the corrugated portion 2.1, 2.2 in the axial direction, d. H. the fluid flow past the corrugated section 2.1, 2.2, so that it does not interact with the corrugated section 2.1, 2.2 of the bellows 2 in interaction, which could have a negative flow effect and could lead to increased noise.
  • FIG. 2 shows a second embodiment of the decoupling element 1 according to the invention. In the present case, only the deviations from the embodiment in FIG. 1 will be discussed explicitly.
  • the individual flow guide parts 3.1-3.4 essentially show the above 1, with their respective front end on the wall of the bellows 2, then have in their further course on a radial extension component, so that reduces their cross-section, and extend in their further course in the Unlike the decoupling element 1 according to FIG. 1, the flow guide parts 3.1 - 3.4 overlap in the axial direction, ie the rear end of the flow guide part 3.1 overlaps in the axial direction with the front end of the flow guide part 3.2, whose rear end in turn with the front end of the flow guide part 3.3. overlaps, etc
  • the radial extension component of the individual flow guide parts 3.1-3.4 and the degree of overlap are chosen so that, despite the existing mobility of the decoupling element 1 and the bellows 2 in the corrugated section 2.1 not to touch the flow guide parts 3.1 - 3.4 with each other or with the Bellows 2 comes, which could affect the mobility of the decoupling element 1 and could lead to damage.
  • FIG. H shows the individual flow guide parts 3.1-3.4 in the embodiment according to FIG. H. formed with the same axial extent.
  • Figure 3 shows the embodiment of the decoupling element 1 according to the invention, in which a number of flow guide parts is formed with an axial extent, which deviates from the axial extent of the other flow guide parts management (clearly).
  • FIG. 3 shows a third embodiment of the decoupling element 1 according to the invention.
  • the decoupling element 1 has three flow guide parts 3.1 - 3.3, which are arranged overlapping in the flow direction S.
  • the first flow guide part 3.1 in the flow direction S and the last flow guide part 3.3 in the flow direction S are of essentially the same length, ie formed with the same axial extension.
  • the middle flow guide part 3.3 is significantly longer than the other two flow guide parts 3.1, 3.3 formed and in this case has about twice as long axial extent as the other two flow guide parts 3.1, 3.3.
  • Such an embodiment of the decoupling element 1 reduces the number of flow guide parts 3.1-3.3 to be used for the same overall axial length and is therefore particularly advantageous if a known bending line or a known bending line is provided by means of the flow guide parts 3.1-3.3 or the flow guide device 3 Bending course of the decoupling element 1 is to be "simulated" at its place of use.
  • FIG. 4 shows further embodiments of the decoupling element 1 according to the invention and in particular deals with different ways of determining the flow guide parts on the bellows 2.
  • FIG. 4 shows three flow guide parts 3.1 - 3.3.
  • the first flow guide part 3.1 in the flow direction S lies with its front end substantially frictionally against the (inner) wall of the bellows 2, and is therefore held in the bellows 2 by means of suitable prestressing via static frictional forces.
  • the second flow guide part 3.2 in the region of its front end is materially connected to the bellows 2, ie the connection partners are held together by atomic or molecular forces, so that between the bellows 2 and the flow guide part 3.2 a non-detachable connection is created, in particular by Welding or the like.
  • the last flow guide part 3.3 is fastened to the bellows 2 by means of a positive connection, wherein the flow guide part 3.3 surrounds a shaft of the bellows 2 in the form of a key in the region of a wave trough.
  • FIG. 5 shows a further embodiment of the decoupling element 1 according to the invention, partly in longitudinal section.
  • the exemplary embodiment according to FIG. 5 essentially corresponds to that which has already been described in detail above with reference to FIG.
  • the flow guide parts 3.1 and 3.2 shown in FIG. 5 are significantly further apart in the axial direction than in the embodiment according to FIG. 1.
  • the bellows 2 has a multi-part or modular design and in the present case is composed of two bellows or bellows modules / segments 2a, 2b, which are arranged one behind the other in the axial direction of the decoupling element 1.
  • the flow guide parts 3.1, 3.2 are each upstream of the corrugated portions of the bellows 2a, 2b arranged non-positively in the respective bellows 2a, 2b.
  • the rear bellows 2b in the flow direction S is radially widened at its front end relative to the rear end of the front bellows 2a, so that the bellows 2b with its front end together with the flow guide part 3.2 connected thereto engages over the rear end of the front bellows 2a.
  • each bellows module 2a and 2b By the respective flow guide part 3.1 and 3.2 each bellows module 2a and 2b, the fluid flow is passed by the overall arrangement of the corrugated portions of the bellows modules 2a, 2b, so that in a simple way a favorable flow through the decoupling element 1 results, without expensive To fall back liner materials and without the mobility of the bellows 2 and the decoupling element 1 would be excessively limited.
  • Figure 6 shows a further embodiment of the decoupling element according to the invention, which substantially corresponds to that according to Figure 5, so that in the present case only differences will be discussed explicitly.
  • the Belgmodule 2a, 2b according to Figure 6 each have a liner 6.1 or 6.2, which extends parallel to the longitudinal axis L in the arrangement substantially over the entire bellows module 2a and 2b respectively.
  • Each alone remains a short section in the region of the front end of the Belgmodu- Ie 2a, 2b, which can expand to assemble individual Belgmodule 2a, 2b to the Retrobalg 2 to overlap the rear end of a previous Belgmoduls together with its liner, which in Figure 6 for the rear bellows module 2b is exemplified.
  • the connection is again secured by means of an end sleeve 4 and a weld seam 5.
  • FIG. 7 shows a further embodiment of the decoupling element 1 according to the invention, which to some extent represents a combination of the embodiments described above according to FIG. 5 and FIG. In the present case, the details of the embodiment according to FIG. 7 will be discussed explicitly only.
  • Each bellows module 2a, 2b has a plurality of flow guide parts 3.1, 6.1, 3.1 'or 3.2, 6.2, 3.2', which in the flow direction S as a first pipe segment 3.1 or 3.2, a liner 6.1 or 6.2 and another Rohrseg- ment 3.1 'and 3.2' are formed. While the respective forward flow Guide parts 3.1 and 3.2 corresponding to the flow guide parts in Figure 1 to 5, ie formed in the flow direction S tapered cross-section, the respective rear flow guide parts 3.1 'and 3.2' this exactly mirror image, ie formed with widening cross-section.
  • the respective front end of the rear flow guide parts 3.1 'and 3.2' is spaced from the bellows 2; Subsequently, the flow guide parts 3.1 'and 3.3' have a section with a radial extension component, so that the rear end of the flow guide parts 3.1 ', 3.2' rests against the bellows 2 or is fixed there.
  • the liner 6.1 or 6.2 is arranged here , which completes the said trough-like course and thus the flow guiding device 3.
  • the liner 6.1 or 6.2 is arranged essentially parallel to the longitudinal axis L of the overall arrangement of the decoupling element 1.
  • the bellows modules 2a, 2b,... are again joined together by means of the end sleeve 4 and the weld seam 5, the rear end of the rear flow guide part 3.1 'being replaced by the design according to FIG End sleeve 4 is overlapped.
  • the configuration according to FIG. 7 enables safe conduction of the fluid flow past the corrugated sections of the bellows modules 2 a, 2 b, wherein the amount of required fluid flows through the use of the front and rear flow guide parts 3.1, 3.1 'or 3.2, 3.2' designed as tube segments Liner material compared to the prior art and also compared to the design in Figure 6 is reduced, resulting in a corresponding cost savings.
  • FIG. 8 shows a further embodiment of the decoupling element according to the invention, partly in longitudinal section. This largely corresponds to the embodiment according to FIG. 6, so that in the present case only special features of the embodiment according to FIG. 8 are explicitly discussed.
  • a connecting element 7 in the form of a pipe section or pipe segment is arranged radially inwardly, which acts as a welding end for connecting the bellows modules 2 a, 2 b.
  • end sleeves 4a and 4b are still arranged in the connection region radially outside the bellows modules 2a, 2b or the bellows module ends.
  • the decoupling element 1 according to Figure 8 on an axially continuous flow guide part 3 but in the connection region of the bellows modules 2a, 2b rests radially inward on the connecting element 7 and there when connecting the Belgmodule 2a, 2b by welding by means of a sym - Bolisch indicated weld seam 5 is fixed cohesively, so that the continuous flow guide part 3 is functionally divided into two separate, successively arranged flow guide parts 3.1, 3.2.
  • the flow guide part 3 or the flow guide parts 3.1, 3.2 are in the present case designed as Agraff inliners.
  • the free ends of the bellows modules 2 a, 2 b are radially widened for connection to line parts, in particular an exhaust system (not shown), and are each provided with end sleeves 4 a ', 4 b'.
  • bellows modules 2a, 2b according to FIG. 5 to FIG. 8 can be combined as desired.
  • Individual decoupling elements 1 according to FIG. 1 to FIG. 3 can also be modularly combined with one another, wherein the connections of the modules described with reference to FIG. 5 to FIG. 8 can be used with one another.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Exhaust Silencers (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Abstract

Elément de séparation (1) pour l'installation de gaz d'échappement d'un véhicule automobile, en particulier d'un véhicule utilitaire, avec un soufflet extérieur (2) et un dispositif de guidage de l'écoulement (3) placé à l'intérieur du soufflet (2), caractérisé en ce que le dispositif de guidage de l'écoulement (3) comprend plusieurs parties de guidage d'écoulement (3.1, 3.2) disposées essentiellement l'une derrière l'autre dans la direction axiale du dispositif de séparation (1).
EP08784936A 2007-08-09 2008-07-22 Élément de séparation pour l'installation de gaz d'échappement d'un véhicule automobile Withdrawn EP2183473A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200720011168 DE202007011168U1 (de) 2007-08-09 2007-08-09 Entkopplungselement für die Abgasanlage eines Kraftfahrzeugs
PCT/EP2008/005971 WO2009018918A2 (fr) 2007-08-09 2008-07-22 Élément de séparation pour l'installation de gaz d'échappement d'un véhicule automobile

Publications (1)

Publication Number Publication Date
EP2183473A2 true EP2183473A2 (fr) 2010-05-12

Family

ID=38580573

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08784936A Withdrawn EP2183473A2 (fr) 2007-08-09 2008-07-22 Élément de séparation pour l'installation de gaz d'échappement d'un véhicule automobile

Country Status (3)

Country Link
EP (1) EP2183473A2 (fr)
DE (1) DE202007011168U1 (fr)
WO (1) WO2009018918A2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202011105924U1 (de) * 2011-09-22 2013-01-08 Witzenmann Gmbh Gasdichter Wickelschlauch mit integrierter Dämpfung
DE102012219458A1 (de) * 2012-10-24 2014-04-24 Witzenmann Gmbh Entkoppelelement für eine Abgasanlage
CN106931265A (zh) * 2015-12-31 2017-07-07 江苏晨光波纹管有限公司 超低温组合波纹管补偿器
DE102018116441A1 (de) * 2018-07-06 2020-01-09 Witzenmann Gmbh Flexibles Leitungselement für die Abgasanlage eines Verbrennungsmotors
CN113217467B (zh) * 2021-06-10 2022-09-23 深圳市缚火龙机电实业有限公司 一种出风口可调节的离心式风机

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Also Published As

Publication number Publication date
WO2009018918A3 (fr) 2009-04-16
WO2009018918A2 (fr) 2009-02-12
DE202007011168U1 (de) 2007-10-11

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