EP4112892B1 - Silencieux - Google Patents

Silencieux Download PDF

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Publication number
EP4112892B1
EP4112892B1 EP22175287.6A EP22175287A EP4112892B1 EP 4112892 B1 EP4112892 B1 EP 4112892B1 EP 22175287 A EP22175287 A EP 22175287A EP 4112892 B1 EP4112892 B1 EP 4112892B1
Authority
EP
European Patent Office
Prior art keywords
opening
region
base wall
edge region
opening edge
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.)
Active
Application number
EP22175287.6A
Other languages
German (de)
English (en)
Other versions
EP4112892A1 (fr
Inventor
Sebastian Hutschenreuther
Rolf Baldes
Thomas Beck
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.)
Eberspaecher Exhaust Technology GmbH and Co KG
Original Assignee
Purem 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 Purem GmbH filed Critical Purem GmbH
Publication of EP4112892A1 publication Critical patent/EP4112892A1/fr
Application granted granted Critical
Publication of EP4112892B1 publication Critical patent/EP4112892B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01N13/007—Apparatus used as intake or exhaust silencer
    • 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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F01N1/023—Helmholtz resonators
    • 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
    • F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
    • 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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • 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
    • F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
    • F01N13/1844—Mechanical joints
    • F01N13/185—Mechanical joints the connection being realised by deforming housing, tube, baffle, plate, or parts thereof
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/20—Methods or apparatus for fitting, inserting or repairing different elements by mechanical joints, e.g. by deforming housing, tube, baffle plate or parts thereof
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/22—Methods or apparatus for fitting, inserting or repairing different elements by welding or brazing
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/02—Two or more expansion chambers in series connected by means of tubes

Definitions

  • the present invention relates to a silencer for an exhaust system of an internal combustion engine, for example in a motor vehicle, and a method for its production.
  • One from the EP 1 888 891 B2 known silencer comprises a silencer housing with a peripheral wall and a plurality of base walls which are surrounded by the peripheral wall and supported on it.
  • such base walls form respective end walls which close off the interior of the silencer housing to the outside in the direction of a housing longitudinal axis.
  • such base walls form respective intermediate walls which separate chambers formed in the interior of the silencer housing from one another.
  • Such chambers can be connected to one another by openings provided in a respective intermediate wall, but can also form a resonator chamber for a Helmholtz resonator.
  • an opening edge region that surrounds a base wall opening and extends from a substantially flat region of a respective base wall in the direction of an opening center axis of a respective base wall opening by forming a passage.
  • This has a substantially cylindrical structure and accommodates an exhaust pipe.
  • Such base wall openings surrounded by a respective opening edge region have an oversize with respect to an external dimension, i.e.
  • each exhaust pipe is then connected to the floor wall through which it passes through by means of a material bond, generally by welding, to form a solid bond.
  • a silencer according to the preamble of claim 1 is known from US 6 659 222 B1 known.
  • a bottom wall separating two chambers from one another and providing an intermediate wall has, in association with an inlet pipe and an outlet pipe, a bottom wall opening surrounded by an opening edge region running in the circumferential direction and protruding from a substantially flat bottom wall region.
  • the inlet pipe and the outlet pipe are held in the respectively associated bottom wall opening by a press fit.
  • a silencer with a base wall providing an intermediate wall is known.
  • An exhaust pipe engages in a base wall opening of this base wall.
  • An opening edge region surrounding the base wall opening is interrupted in the circumferential direction and has several opening edge region segments, between which circumferential recesses are formed in the essentially flat base wall region supporting the opening edge region.
  • the opening edge region segments are fixed to the exhaust pipe engaging in the base wall opening by welding or soldering.
  • a silencer for an exhaust system of an internal combustion engine comprises a silencer housing with a peripheral wall elongated in the direction of a housing longitudinal axis and at least a bottom wall which is surrounded by the peripheral wall and/or held on the peripheral wall and delimits a chamber in the silencer housing, wherein in at least one bottom wall at least one bottom wall opening is provided which is surrounded by an opening edge region which is bent essentially in the direction of the longitudinal axis of the housing on a substantially flat bottom wall region of the bottom wall and which receives an exhaust pipe with a press fit.
  • At least one exhaust pipe is held in an associated base wall opening by means of a press fit, whereby on the one hand a stable connection is achieved, and on the other hand the occurrence of relative movements between the base wall and the exhaust pipe passing through it, which can lead to impact noises or rattling noises, is avoided due to the constant contact under pressure or pre-tension. Further measures to provide a solid connection are basically not necessary.
  • the opening edge region is designed to be interrupted in the circumferential direction around an opening center axis of the base wall opening.
  • the opening edge region comprises a plurality of opening edge region segments arranged at a distance from one another in the circumferential direction around an opening center axis of the base wall opening.
  • the at least one base wall can be designed as a sheet metal formed part.
  • the opening edge area is to be closed in the circumferential direction, for example in order to achieve a substantially gas-tight closure, it is advantageous if at least one base wall has a wall thickness of a maximum of 1 mm, preferably a maximum of 0.6 mm.
  • the base wall is also in the area of the closed opening edge area in order to create the press fit when inserting or pressing the exhaust pipe into the base wall opening.
  • the material is sufficiently deformable within its elastic deformability range to accommodate an exhaust pipe and to generate a sufficiently strong contact pressure against its outer peripheral surface.
  • the opening edge region has a first edge section adjoining the essentially flat base wall region in a first bending region and a second edge section adjoining the first edge section in a second bending region, wherein a radial distance of the first edge section to an opening center axis of the base wall opening preferably decreases essentially constantly in the direction from the first bending region to the second bending region.
  • the region of the minimum distance of the opening edge region to the opening center axis can then be provided in the region of the second bending region.
  • a radial distance of the second edge section with respect to the opening center axis preferably increases substantially constantly in the direction away from the second bending region.
  • the opening edge region extends in a curved manner from a first axial end region of the opening edge region adjoining the substantially flat region of the bottom wall to an axial region of the opening edge region with a minimum distance from an opening center axis of the bottom wall opening.
  • the entire opening edge region can be designed as, for example, with A deformation region of the bottom wall with an approximately constant radius of curvature in the axial direction can be provided.
  • the at least one base wall is an intermediate wall separating two chambers in the silencer housing. It should be noted that, of course, one or more intermediate walls in a silencer can be designed as a base wall with the structure described above. It should also be noted that several base wall openings can also be formed in one or more such base walls, of which one or possibly several or all can have the structure described above for receiving a respective exhaust pipe with a press fit.
  • the dimensions that must be coordinated with one another must be taken into account in those areas that interact with one another when the silencer is installed.
  • This means that the exhaust pipe in the area where it passes through a floor wall when the silencer is installed has an oversize compared to the floor wall opening formed in the floor wall to accommodate this exhaust pipe, but in other length areas it can have a smaller cross-sectional dimension or possibly an even larger cross-sectional dimension than this floor wall opening.
  • such a bottom wall opening and an exhaust pipe to be accommodated therein are preferably each designed with a circular cross-section, so that the inner dimension can be represented, for example, by the inner diameter and the outer dimension can be represented, for example, by the outer diameter.
  • the opening edge region is provided interrupted in at least one peripheral region.
  • the opening edge region is formed with a plurality of opening edge region segments arranged at a distance from one another in the circumferential direction around the opening center axis.
  • the opening edge region is provided, starting from the substantially flat region of the base wall, with a decreasing distance from the opening centre axis up to an axial region of the opening edge region with a minimum distance from the opening centre axis.
  • the opening edge region is provided with an increasing distance from the opening center axis from the region of the opening edge region with a minimum distance from the opening center axis to the free axial end region of the opening edge region.
  • a difference between the predetermined external dimension of the exhaust pipe and the predetermined internal dimension of the floor wall opening provided for receiving the exhaust pipe is in the range of 0.2 mm to 0.6 mm, preferably around 0.4 mm.
  • the at least one floor wall is provided as a formed sheet metal part and/or with a wall thickness of a maximum of 1 mm, preferably a maximum of 0.6 mm.
  • a silencer housing 20 of the silencer 10 further comprises an elongated, for example essentially cylindrical, peripheral wall 22 in the direction of a housing longitudinal axis L, which is connected to the radially outer region of the base walls 12, 14, 16, 18 or surrounds them.
  • the base walls 12, 18 arranged at the axial end regions 24, 26 of the peripheral wall 22 form respective end walls of the silencer housing 20, which close off the silencer interior at the two axial ends.
  • the base walls 12, 18 can be firmly and gas-tightly connected to the peripheral wall 22 in their radially outer region by material bonding, for example welding.
  • the base walls 12, 18 providing the respective end walls can be firmly and gas-tightly connected to the peripheral wall 22 in the axial end regions 24, 26 by form-fitting, for example by flanging.
  • the base walls 14, 16 arranged between the two end walls providing base walls 12, 18 form respective intermediate walls which, together or in connection with the base walls 12, 18 providing the end walls, divide the silencer interior into a total of three chambers 28, 30, 32.
  • the base walls 14, 16 providing intermediate walls can be held in a defined position, for example, on the inner circumference of the peripheral wall 22 by a clamping effect and/or material bonding, for example welding.
  • the floor walls 12, 14, 16, 18 each have a floor wall opening 34, 36, 38, 40 in a central area, the structure of which is explained in more detail below.
  • the floor wall openings 34, 36 of the The bottom walls 12, 14 are penetrated by an exhaust pipe 42, which can form an inlet pipe, for example, through which exhaust gas is introduced into the silencer interior.
  • the bottom wall openings 38, 40 of the bottom walls 16, 18 are penetrated by an exhaust pipe 44, which can provide an outlet pipe, for example, through which exhaust gas is discharged from the silencer 10.
  • the exhaust pipe 42 can, for example, be open to the chamber 28 formed between the two bottom walls 12, 14 and can be open in an axial end region thereof to the chamber formed between the two bottom walls 14, 16.
  • the chamber 28 can be connected to the chamber 30 via one or more flow openings formed in the bottom wall 14.
  • the chamber 32 can form a resonator chamber of a Helmholtz resonator and can be connected to the chamber 30 via an exhaust pipe 46 provided in the bottom wall 16 and providing a resonator neck.
  • a silencer described is only an example and this structure can be varied in many different aspects. This can affect the number and positioning of the base walls provided on the silencer, as well as the number of exhaust pipes introducing exhaust gas into the silencer or exhaust pipes discharging exhaust gas from the silencer.
  • the exhaust gas routing inside the silencer can also be implemented differently than in the example shown.
  • bottom wall 14 which forms an intermediate wall and separates the silencer interior from two chambers 28, 30 that are in exhaust gas exchange communication with one another.
  • the Fig. 1 to 3 show the area of the base wall 14 in which the base wall opening 36 provided therein is penetrated by the exhaust pipe 42.
  • an opening edge area 50 designed for example as a passage, is bent on the base wall 14 from a substantially flat base wall area 48 of the base wall 14 that is oriented substantially orthogonally to the longitudinal axis L of the housing in the direction of the longitudinal axis L of the housing, which in the embodiment example shown corresponds to an opening center axis M.
  • the base wall 14 constructed of sheet metal material is formed using appropriate tools in the area of the base wall opening 36.
  • an edge area bent in the direction of the longitudinal axis L of the housing can also be formed in the radially outer area, i.e. where the base wall 14 is held on the peripheral wall 22.
  • the opening edge region 50 can be interrupted in the circumferential direction and can be constructed, for example, with four opening edge region segments 52 that follow one another in the circumferential direction and are arranged at a circumferential distance from one another, between which respective circumferential recesses 54 are formed in the base wall 14 or the essentially flat base wall region 48, via which the two chambers 28, 30 separated from one another by the base wall 14 are in exhaust gas exchange communication with one another.
  • the opening edge region 50 can be designed as a circumferentially An opening edge region which completely surrounds a respective opening center axis M of the respective bottom wall opening 34, 40 or 38 and is not interrupted in the circumferential direction can be formed.
  • the opening edge region 50 has a first edge section 58 which adjoins the essentially flat bottom wall region 48 in a first bend region 56.
  • the first edge section 58 has a structure which tapers essentially conically or truncated conically with respect to the opening center axis M starting from the first bend region 56, so that, starting from the first bend region 56, the distance of the first edge section 58 to the opening center axis M decreases essentially constantly.
  • the first edge section 58 viewed in the axial direction, is essentially not curved, and of course has a structure which is, for example, circularly curved around the opening center axis M.
  • a second edge section 62 adjoins the first edge section 58.
  • the second edge section 62 likewise has a conical or truncated cone-like structure, so that its radial distance from the opening center axis M increases essentially constantly, starting from the second bending region 60.
  • the opening edge region 50 thus has a structure that is essentially V-shaped in longitudinal section between a first axial end region 64 adjoining the essentially flat bottom wall region 48 in the region of the first bending region 56 and a second axial end region 66 of the same that is remote from the bottom wall region 48.
  • the opening edge area 50 has a minimum distance from the opening center axis M of the bottom wall opening 36.
  • this minimum distance corresponds to a predetermined inner dimension a, which, in particular in the case of a substantially circular design of the bottom wall opening 36, the radius of the bottom wall opening 36 with respect to the opening center axis M or the inner diameter, i.e. twice the radius.
  • the exhaust pipe 42 is dimensioned such that its predetermined outer dimension A, for example also represented by the radius or twice the radius, i.e. the diameter, of the exhaust pipe 42, which is designed with a circular cross-section, for example, is larger than the corresponding predetermined inner dimension a of the base wall opening 36.
  • the outer dimension A i.e. for example the diameter of the exhaust pipe 42 corresponding to twice the radius R, can be designed with an excess in the range of 0.2 mm to 0.6 mm, preferably about 0.4 mm, with respect to the corresponding inner dimension a, i.e. for example the inner diameter of the base wall opening 36.
  • the exhaust pipe 42 When assembling the silencer 10, after the base wall 14 has been provided with the shape intended for this purpose and has been surrounded by the peripheral wall 22 if necessary, the exhaust pipe 42 is inserted into the base wall opening 36 in the direction of the opening center axis M or the housing longitudinal axis L of the silencer 10. Due to the excess size of the exhaust pipe 42 with respect to the base wall opening 36 that accommodates it, the opening edge region 50 is slightly spread radially when the exhaust pipe 42 is inserted, so that the exhaust pipe 42 is held in the base wall opening 36 by a press fit and thus by a frictional connection.
  • the opening edge region 50 or its opening edge region segments 52 which are radially spread out in the region of their elastic deformability, press with a force F radially inward against the outer circumference of the exhaust pipe 42, so that on the one hand the exhaust pipe 42 is held in a defined position with respect to the base wall 14, and on the other hand a defined contact is produced on the exhaust pipe 42 by the opening edge region segments 52 pressing with the force F against the outer circumference of the exhaust pipe 42, so that the occurrence of rattling noises can be avoided.
  • An insertion bevel is formed on the edge sections 58, 62 for the exhaust pipe 42 to be accommodated in the bottom wall opening 36, which allows easy insertion of the exhaust pipe 42 into the bottom wall opening 36 and avoids getting caught due to sharp-edged contact.
  • the opening edge region 50 is also formed with two edge sections 58, 62.
  • the edge section 58 adjoins the essentially flat bottom wall region 48 in the axial end region 64 of the opening edge region 50, while the edge section 62 provides the second axial end region 66 remote from the bottom wall region 48.
  • Both edge sections 58, 62 are curved in the axial direction and have a significantly larger radius of curvature than, for example, the two bending regions 56, 60 of the Fig.3 illustrated embodiment.
  • a substantially constant radius of curvature could be provided in each of the edge sections 58, 62 up to the region 68 with the minimum diameter of the opening edge region 50, and the radii of curvature in the two edge sections 58, 62 could, for example, be the same as one another, but could of course also be designed differently.
  • the radius of curvature in the edge section 62 could be smaller than the radius of curvature in the edge section 58.
  • the opening edge region 50 is provided with the previously described circumferentially segmented configuration in order, on the one hand, to provide increased flexibility in the region of the bottom wall opening and, on the other hand, to enable gas to pass through the bottom wall opening in this region.
  • the opening edge region 50 has neither the two edge sections 58, 62, which adjoin the substantially flat bottom wall region 48 or each other in respective bending regions 56, 60.
  • the edge section 58 has, for example, the Fig.3 recognizable cone-like or
  • the second edge section 62 has a substantially cylindrical structure, i.e. has a substantially constant distance to the opening center axis M between the second bending region 60 and the second axial end region 66, so that the minimum distance to the opening center axis M is provided between the second bending region 60 and the second axial end region 66.
  • a substantially flat, i.e. axially further extended, contact region is provided between the opening edge region 50 and the exhaust pipe 42.
  • This is suitable for providing, in addition to the press fit generated by the force F exerted radially inward, a firm connection between the bottom wall 14 and the exhaust pipe 42 by material bonding, for example by a circumferential weld seam 70, which can be formed as a fillet weld between a substantially axially oriented end face of the second edge portion 62 and the outer circumferential surface of the exhaust pipe 42.
  • the opening edge region 50 can be designed to run all the way around in the circumferential direction, i.e. without interruption, or can be provided as an opening edge region interrupted in the circumferential direction at least at one point, for example as an opening edge region with a plurality of opening edge region segments following one another in the circumferential direction.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Claims (8)

  1. Un silencieux pour un système d'échappement d'un moteur à combustion interne, comprenant un boîtier de silencieux (20) avec une paroi circonférentielle (22) qui s'étend longitudinalement dans la direction d'un axe longitudinal du boîtier (L) et au moins une paroi de base (14, 16) qui est entourée par la paroi circonférentielle (22) ou/et retenue sur la paroi circonférentielle (22) séparant deux chambres (28, 30, 32) dans le boîtier de silencieux (20) et fournissant une paroi intermédiaire, dans lequel au moins une ouverture de paroi de base (36, 38), qui est entourée par une zone de bord d'ouverture (50) qui est pliée à une zone de paroi de base essentiellement plane (48) de la paroi de base (14, 16) essentiellement dans la direction de l'axe longitudinal du boîtier (L), et reçoit un tuyau d'échappement (42) avec un ajustement serré, est fournie dans au moins une paroi de base (14, 16),
    caractérisé en ce que
    - la zone de bord d'ouverture (50) est conçue de manière à être interrompue circonférentiellement autour d'un axe central d'ouverture (M) de l'ouverture de paroi de base (36, 38), dans lequel la zone de bord d'ouverture (50) comprend une pluralité de segments de zone de bord d'ouverture (52) disposés à distance les uns des autres circonférentiellement autour d'un axe central d'ouverture (M) de l'ouverture de paroi de base (36, 38), et dans lequel des évidements circonférentiels (54) sont formés dans la zone essentiellement plane de la paroi de base (48) entre les segments de zone de bord d'ouverture (52) se succédant dans la direction circonférentielle, dans laquelle les chambres (28, 30, 32) séparées par au moins une paroi de base (14, 16) sont en communication d'échange de gaz d'échappement par l'intermédiaire des évidements circonférentiels,
    - la zone de bord d'ouverture (50) a une première section de bord (58) adjointe à la zone de la paroi de base essentiellement plane (48) dans une première zone de flexion (56) et une deuxième section de bord (62) adjointe à la première section de bord (58) dans une deuxième zone de flexion (60), dans laquelle un espacement radial de la première section de bord (58) à partir d'un axe central d'ouverture (M) de l'ouverture de paroi de base (34, 36, 38, 40) diminue dans la direction de la première zone de flexion (56) à la deuxième zone de flexion (60), et
    - un espacement radial de la deuxième section de bord (62) par rapport à l'axe central d'ouverture (M) augmente dans la direction opposée à la deuxième zone de flexion (60).
  2. Le silencieux selon la revendication 1, caractérisé en ce que ledit au moins une paroi de base (14, 16) est conçue comme une pièce de tôle déformée ou/et en ce que ledit au moins une paroi de base (14, 16) a une épaisseur de paroi (W) ne dépassant pas 1 mm, de préférence ne dépassant pas 0,6 mm.
  3. Le silencieux selon l'une des revendications précédentes, caractérisé en ce que l'espacement radial de la première section de bord (58) par rapport à un axe central d'ouverture (M) de l'ouverture de paroi de base (36, 38) diminue essentiellement de façon constante dans la direction de la première zone de flexion (56) vers la deuxième zone de flexion (60).
  4. Le silencieux selon l'une des revendications précédentes, caractérisé en ce que l'espacement radial de la deuxième section de bord (62) par rapport à l'axe central d'ouverture (M) augmente de façon essentiellement constante dans la direction opposée à la deuxième zone de flexion (60).
  5. Le silencieux selon l'une des revendications précédentes, caractérisé en ce que la zone de bord d'ouverture (50) est courbée depuis une première zone d'extrémité axiale (64), adjointe à la zone de paroi de base essentiellement plane (48), de la zone de bord d'ouverture (50) jusqu'à une zone axiale (68) de la zone de bord d'ouverture (50) avec un écart minimum par rapport à l'axe central d'ouverture (M) de l'ouverture de paroi de base (36, 38).
  6. Le silencieux selon la revendication 5, caractérisé en ce que la zone de bord d'ouverture (50) s'étend en forme coudée depuis la zone (68) de la zone de bord d'ouverture (50) avec un espacement minimum de l'axe central d'ouverture (M) de l'ouverture de paroi de base (36, 38) jusqu'à une deuxième zone d'extrémité axiale (66), éloignée de la zone de la paroi de base essentiellement plane (48), de la zone de bord d'ouverture (50).
  7. Un procédé de fabrication d'un silencieux (10) pour un système d'échappement d'un moteur à combustion interne selon l'une des revendications précédentes, comprenant les étapes suivantes :
    a) Fournir au moins une paroi de base (14, 16) pour un boîtier de silencieux (20) de telle sorte qu'au moins une ouverture de paroi de base (36, 38) formée dans la paroi de base (14, 16) est entourée par une zone de bord d'ouverture (50) pliée à l'écart d'une zone de paroi de base essentiellement plane (48) essentiellement dans la direction d'un axe central d'ouverture (M) de telle sorte que l'ouverture de paroi de base (36, 38) a une dimension interne prédéterminée a), de préférence un diamètre interne,
    b) Fournir un tuyau d'échappement (42, 44), à recevoir dans l'ouverture de paroi de base (50) entourée par la zone de bord d'ouverture (50), avec une dimension externe prédéterminée (A), de préférence un diamètre externe, dans lequel la dimension externe prédéterminée (A) du tuyau d'échappement (42, 44) est supérieure à la dimension interne prédéterminée a) de l'ouverture de paroi de base (36, 38),
    c) Introduire le tuyau d'échappement (42, 44) dans l'ouverture de paroi de base (36, 38) entourée par la zone de bord d'ouverture (50) de telle sorte que le tuyau d'échappement (42, 44) soit retenu dans l'ouverture de paroi de base (36, 38) entourée par la zone de bord d'ouverture (50) par un ajustement serré,
    caractérisé en ce que
    - à l'étape a), la zone de bord d'ouverture (50) est fournie de manière à être interrompue dans au moins une zone circonférentielle, avec une pluralité de segments de zone de bord d'ouverture (52) disposés à distance les uns des autres circonférentiellement autour de l'axe central d'ouverture (M),
    - à l'étape a), la zone de bord d'ouverture (50) est pourvue, à partir de la zone de la paroi de base essentiellement plane (48), d'un espacement par rapport à l'axe central d'ouverture (M) qui diminue jusqu'à une zone axiale (68) de la zone de bord d'ouverture (50) avec un espacement minimum par rapport à l'axe central d'ouverture (M), et
    - à l'étape a), la zone de bord d'ouverture (50) est pourvue d'un espacement par rapport à l'axe central d'ouverture (M) qui augmente à partir de la zone (68) de la zone de bord d'ouverture (50) avec un espacement minimum par rapport à l'axe central d'ouverture (M) jusqu'à la zone d'extrémité axiale libre (50) de la zone de bord d'ouverture.
  8. Le procédé selon la revendication 7, caractérisé en ce qu'une différence entre la dimension externe prédéterminée (A) du tuyau d'échappement (42, 44) et la dimension interne prédéterminée (a) de l'ouverture de paroi de base (36, 38) prévue pour recevoir le tuyau d'échappement (42, 44) est comprise entre 0,2 mm à 0,6 mm, de préférence est d'environ 0,4 mm, ou/et dans lequel, à l'étape a), ledit au moins une paroi de base (14, 16) est prévue comme pièce en tôle déformée ou/et dont l'épaisseur de paroi (W) ne dépasse pas 1 mm, de préférence ne dépasse pas 0,6 mm.
EP22175287.6A 2021-06-30 2022-05-25 Silencieux Active EP4112892B1 (fr)

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DE102021116802.3A DE102021116802A1 (de) 2021-06-30 2021-06-30 Schalldämpfer

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US5477015A (en) * 1991-05-03 1995-12-19 Maremont Corporation Vehicular muffler with improved mechanical lock joints
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EP4112892A1 (fr) 2023-01-04
US20230003162A1 (en) 2023-01-05
DE102021116802A1 (de) 2023-01-05

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