EP0395540A1 - Modularer Schalldämpfer - Google Patents

Modularer Schalldämpfer Download PDF

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Publication number
EP0395540A1
EP0395540A1 EP90420190A EP90420190A EP0395540A1 EP 0395540 A1 EP0395540 A1 EP 0395540A1 EP 90420190 A EP90420190 A EP 90420190A EP 90420190 A EP90420190 A EP 90420190A EP 0395540 A1 EP0395540 A1 EP 0395540A1
Authority
EP
European Patent Office
Prior art keywords
axial
tubular
envelope
zone
wall
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Withdrawn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
EP90420190A
Other languages
English (en)
French (fr)
Inventor
Paul Deville
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.)
Devil SA
Original Assignee
Devil SA
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 Devil SA filed Critical Devil SA
Publication of EP0395540A1 publication Critical patent/EP0395540A1/de
Withdrawn legal-status Critical Current

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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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1872—Construction facilitating manufacture, assembly, or disassembly the assembly using stamp-formed parts or otherwise deformed sheet-metal
    • 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
    • F01N1/003—Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages
    • F01N1/006—Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages comprising at least one perforated tube extending from inlet to outlet of the 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
    • 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
    • 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
    • F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with sound-absorbing materials
    • 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
    • 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
    • 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
    • F01N13/1888—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells
    • F01N13/1894—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells the parts being assembled in longitudinal direction
    • 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
    • F01N2490/15—Plurality of resonance or dead chambers
    • F01N2490/155—Plurality of resonance or dead chambers being disposed one after the other in flow direction
    • 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
    • F01N2530/00—Selection of materials for tubes, chambers or housings
    • F01N2530/02—Corrosion resistive metals
    • F01N2530/04—Steel alloys, e.g. stainless steel
    • 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
    • F01N2530/00—Selection of materials for tubes, chambers or housings
    • F01N2530/26—Multi-layered walls

Definitions

  • the present invention relates to a range of silencers for internal combustion engines, usable in particular on vehicles such as cars and motorcycles.
  • silencers for internal combustion engines are already known. They generally comprise an outer envelope forming a closed enclosure, pierced with at least two orifices allowing respectively the entry and exit of the exhaust gases and suitable for the connection of an inlet tube and an outlet tube leading gas.
  • the closed envelope contains means for the expansion of the exhaust gases and their conduction between the inlet and outlet orifices.
  • the most commonly used envelope structure comprises a tubular peripheral side wall developing longitudinally along a longitudinal axis, said peripheral side wall connecting at its ends to two transverse end walls to which it is connected by a peripheral crimp forming a bead.
  • Such a structure has the drawback of a relatively short service life, due in particular to the presence of the peripheral crimp connection between the side wall and the end walls, which crimping is provided in an area forming a corner in which develop chemical reactions gradually attacking the metal forming the envelopes.
  • the external profile of such a silencer leads to an increase in the overall diameter of the silencer, at given internal volume, and this results in a reduction in the useful volume compared to the total external volume. , and a decrease in efficiency.
  • this silencer structure is not suitable for the production of a range of silencers of different sizes: to produce two silencers of different lengths, it is necessary to provide longitudinal tubular peripheral casings of different lengths.
  • the silencer is made up of an outer protective casing comprising two semi-cylindrical half-shells connecting according to two flattened terminal generators, the corresponding generators being assembled by crimping and thus forming two diametrically opposite beads occupying the entire length of the silencer.
  • the external lateral beads increase the size of the silencer, with equal internal volume.
  • the object of the present invention is in particular to avoid the drawbacks of these traditional silencer structures, by proposing a new structure which, using a limited number of standard elements, makes it possible to produce silencers whose lengths are different. We seek, for this, to adapt axially end to end a greater or lesser number of different unit elements, to produce silencers whose diameters are substantially identical but whose lengths depend on the number and structure of the assembled elements.
  • Silencer structures are already known which are produced by axial end-to-end assembly of at least two unit elements, each unit element being formed by an axial peripheral side wall limited at its first end by a sharp annular edge and connecting to its second. end to a radial part constituting a transverse end wall of the silencer. These structures are described in particular in documents US-A-2 205 024, DE-C-402 357, DE-A-2 623 153, US-A-3 670 845.
  • the object of the invention is therefore to avoid these drawbacks, by proposing a particular structure allowing the edge-to-edge welding of the muffler elements connected axially end to end with respect to each other, the structure of the elements ensuring by itself the guiding of the edges of elements one with respect to the other when welding, so that the edges to be welded to each other are correctly and automatically centered.
  • the weld obtained is of good quality and easy to perform, and the seal is improved.
  • the invention also makes it possible to internally maintain the two edges to be welded, allowing the application of centripetal forces on the edges during welding, without these forces displacing or deforming them.
  • the edge guide means according to the invention allow a significant increase in the shape tolerances of the respective edges of the envelope elements, and in particular make it possible to compensate for certain deformations or ovalizations of these edges.
  • the means for guiding the edges of elements with respect to one another during welding provide in themselves other functions, such as a function of separating two compartments, or a function of interior maintenance of other elements in the silencer.
  • the new silencer structure also makes it possible to increase the volume of the envelope with constant external dimensions, in particular by eliminating the peripheral or longitudinal beads which are encountered in traditional structures.
  • the invention further aims to increase the efficiency of the muffler, and in particular to reduce the noises of expansion of the gases.
  • An important object of the invention is the increase in the longevity of the silencer, this increase in longevity being obtained by a particular structure reducing the risks of attack of the metal forming the envelope, improving the resistance to vibration, and formed of materials which are susceptible to corrosion.
  • the silencer structure comprises an outer envelope forming a closed enclosure, comprising: - At least a first envelope element formed by a continuous wall in which there is a tubular axial part and a radial part, the tubular axial part being limited to its first end by a first frank annular edge, defining a plane substantially perpendicular to the longitudinal axis of the silencer, connecting at its second end to the radial part constituting a first transverse end wall of the silencer, - At least one second casing element, formed of a continuous wall comprising a tubular axial part constituting a portion of the axial peripheral lateral wall of muffler, the axial part being limited at its first end by a second frank annular edge defining a plane substantially perpendicular to the longitudinal axis of the silencer, of the same shape as said first straight edge, and connecting at its second end to a radial part constituting a transverse wall, - Said first and second envelope element formed by a continuous wall in which
  • the joining of the two envelope elements is preferably carried out by a joining means such as a weld.
  • a joining means such as a weld.
  • an internal part with a cylindrical periphery forms a connection support against which the two internal faces of the closed annular axial parts of the first and second envelope elements are pressed simultaneously in the vicinity of said edges.
  • the securing means such as a weld can advantageously simultaneously secure the two edges of the first and of the second envelope element and the inner piece forming a support.
  • the first and the second envelope element each constitute a part produced separately by axial forming of a plate material, for example by flow spinning, or embossing, or deep drawing.
  • the tubular axial part of at least one of the first and second envelope elements comprises an annular constriction in the zone of connection to the radial part. This constriction defines a tubular axial zone of smaller section on which the first open end of another can fit together with little play. envelope element.
  • the exhaust silencer comprises an outer casing 1 forming a closed enclosure, delimited by an axial peripheral side wall 2 developing along a longitudinal axis II.
  • the enclosure is closed at a first end by a first transverse end wall 3, and is closed at its second end by a second transverse end wall 4.
  • the first transverse end wall 3 is pierced with a first orifice 5
  • the second transverse end wall 4 is pierced with a second orifice 6.
  • a first end tube 7 fits into the first orifice 5.
  • a perforated inner longitudinal tube 8 adapts, by its first end, in the first end tube 7, and adapts by its second end in the second orifice 6.
  • a second end tube 9 fits into the second end of the inner perforated longitudinal tube 8.
  • the inner perforated longitudinal tube 8 passes right through the casing 1.
  • the space between the longitudinal tube perforated interior 8 and the outer casing 1 of the silencer is filled with material usually used in the manufacture of silencers, for example a fibrous material 10 such as basalt wool, stainless steel wool, or another fibrous material.
  • the interior space of the external envelope 1 is divided into two compartments, a first compartment 11 and a second compartment 12, separated by a transverse intermediate wall 13.
  • the transverse intermediate wall 13 connects an intermediate zone of the external envelope 1 and an intermediate zone of the perforated inner longitudinal tube 8, as shown in the figure.
  • the present invention relates in particular to the structure and shape of the outer casing 1 and the transverse inner wall 13, to fulfill the aims of the invention.
  • the outer casing 1 is made up of two main parts, namely a first casing element 14 constituting substantially the casing of the first compartment 11, and a second element envelope 15 constituting substantially the envelope of the second compartment 12.
  • the two envelope elements 14 and 15 have the same shape, and this shape is shown in more detail in FIG. 2.
  • the envelope element consists of a continuous wall comprising an axial tubular part 16, intended to form a part of the peripheral wall 2 of the silencer, the axial part 16 being limited at its first end by a frank annular edge 17 situated in a plane 18 substantially perpendicular to the longitudinal axis II of the envelope element.
  • the axial part 16 is connected at its second end to a radial part 19 intended to constitute one of the transverse end walls of the silencer.
  • the tubular axial part 16 comprises an annular constriction 20, as shown in FIG. 2, defining a tubular axial zone 21 of smaller section than the rest of the part axial 16.
  • the tubular axial zone 21 has a section such that another envelope element identical to the element shown in FIG. 2 can come to fit on said tubular axial zone 21 by its open end corresponding to its annular edge 17, the adaptation taking place at low clearance.
  • the constriction 20 corresponds substantially to the thickness of the wall forming the axial part 16.
  • the radial part 19 is pseudo-spherical with outwardly convexity, and, in the embodiment shown, comprises an orifice 22 for adapting a gas passage tube.
  • the orifice 22 comprises a protruding tubular lip 23, forming a cylinder with an axis substantially parallel to the longitudinal axis 11.
  • the tubular lip 23 is connected to the radial part 19 by a peripheral zone of particular shape: on at least one portion from its periphery, said peripheral zone forms an external groove 24, formed by the curvature of the wall forming the radial part, as shown in FIG. 2.
  • the groove 24 may have a semicircular section, of equal radius about 5 millimeters.
  • the orifice 22 is off-center with respect to the longitudinal axis I-I of the envelope element.
  • the groove 24 occupies only part of the periphery of the tubular lip 23, namely the portion close to the longitudinal axis I-I.
  • the outer portion 25, further from the longitudinal axis I-I, is connected by a simple rounding as shown in the figure.
  • the groove 24 constitutes an intermediate deformation zone between the tubular lip 23 and the radial part 19, and allows slight variations in axial orientation of the tubular lip 23 relative to the longitudinal axis I-I. This possibility allows the orientation, over a relatively small but nevertheless sufficient range, of the gas passage tubes with respect to the silencer. These orientation variations make it possible to follow the variations in dimensions due to the heating of the materials during use, heating caused by the hot gases leaving the internal combustion engine.
  • groove 24 makes it possible to use curved end walls 3 and 4, favorable to aerodynamics and to resistance to corrosion, without appreciable loss of volume compared to a form of cylindrical envelope with ends. flat.
  • the presence of the groove 24 also makes it possible to increase the useful length of the tubular lip 23, for a correct adaptation of a gas passage tube in said lip 23, without increasing the overall length of the envelope element.
  • the radial part 19, in the embodiment presented, consists of an intermediate portion 26 with a relatively large radius, for example 120 millimeters, connecting to the tubular axial zone 21 by an annular rounding 27 with a smaller radius, for example 15 millimeters.
  • the tubular axial zone 21 has a sufficient length, for example ten millimeters, for the correct adaptation of one envelope element to the other.
  • the wall of the envelope element advantageously consists of several thin sheets in contact with each other and formed together by axial forming.
  • the forming of the outer 28 and inner 29 sheets is performed at the same time, for example by deep drawing, by spinning or embossing. These techniques make it possible, for example, to produce a blind tubular casing element having a diameter of approximately 150 millimeters, for a length of approximately 220 millimeters.
  • the two sheets 28 and 29 produce a double skin substantially reducing the transmission of sound waves to the outside of the enclosure.
  • it is advantageous to use other multilayer materials for example a pair of stainless steel sheet-stainless steel fabric, or for example a stack of stainless steel sheet-elastomer-steel sheet. It is also possible to envisage making a non-metallic molded technical plastic material, a carbon fiber-based composite or other composites which support thermal stresses.
  • two envelope elements are used such as the element shown in FIG. 2, namely the first envelope element 14 and the second envelope element 15.
  • the two elements envelope 14 and 15 are oriented in opposite directions and assembled axially to each other in opposition, as shown in FIG. 1, according to an intermediate peripheral connection zone 30 formed by the annular edge 17 of the first element 14 and the annular edge 32 of the second element 15 axially pressed one against the other edge to edge.
  • a joining means 33 such as laser or plasma welding ensures the tight joining of the two edges 17 and 32 to each other along the entire periphery of their connection zone 30. It can also be secured by means 33 such as bonding, welding, bonding.
  • the axial tubular parts of the first and second casing elements are cylindrical and of the same sections, to form a cylindrical axial peripheral side wall of muffler.
  • the term "cylindrical” must be understood in the broad mathematical sense: the section can be circular, oval or arbitrary.
  • transverse intermediate wall 13 In line with the intermediate peripheral connection zone 30, there is an internal support part, formed, in the embodiment shown, by the transverse intermediate wall 13.
  • Said internal part forming a transverse intermediate wall 13 is shaped to produce a connection support , against which the two inner faces of the tubular axial parts of the first casing element 14 and the second casing element 15 are in simultaneous abutment in the vicinity of their respective edges 17 and 32.
  • the inner part forming a transverse intermediate wall 13 comprises a peripheral surface 34, the shape of which corresponds to the shape of the inner periphery of the edges 17 and 32 to ensure close contact.
  • the transverse intermediate wall 13 can advantageously be constituted by a part having the same shape as the radial part 19 and the tubular axial zone 21 of an envelope element shown in FIG. 2.
  • this intermediate part 13 can be produced with the same tools as those used to form the end of the envelope element of Figure 2.
  • the attachment means 33 advantageously ensures the simultaneous attachment of the two edges 17 and 32, and of the cylindrical peripheral portion 34 of the transverse inner wall 13.
  • an internal support piece formed of a simple ferrule, or cylindrical annular element can be arranged at the level of the intermediate peripheral connection zone 30, at the level of the intermediate peripheral connection zone 30, an internal support piece formed of a simple ferrule, or cylindrical annular element, can be arranged.
  • the ferrule has a sufficient length to form a connecting support, against which the two inner faces of the edges of tubular axial parts of the first casing element 14 and of the second casing element 15 are pressed simultaneously.
  • the ferrule comprises a surface device 34 whose shape corresponds to the inner periphery of edges 17 and 32, to ensure close contact.
  • the shell does not divide the muffler into two compartments, but only fulfills the support and guiding functions of the respective two edges 17 and 32 of the envelope elements.
  • the following figures illustrate the modular nature of the silencer structure according to the invention. They show how, from a very small number of elementary parts, it is possible to design a varied range of silencers, having various lengths, and in which the outer casing has the general structure shown in FIG. 2.
  • FIG. 3 the structure of the silencer of FIG. 1 is shown schematically, with a first casing element 14, a second casing element 15, a transverse intermediate wall 13, a perforated inner longitudinal tube 8 , and two end tubes 7 and 9.
  • the silencer shown in FIG. 4 takes up substantially the same structure, with one difference: the orifice corresponding to the first end tube 7 is offset on one side relative to the longitudinal axis 2-5 of the silencer, then that the orifice corresponding to the second end tube 9 is offset in the other direction.
  • a first perforated inner longitudinal tube 8 is held on the one hand by the first end tube 7 and on the other hand by an intermediate wall 130, inverted with respect to the intermediate wall 13, and of the same shape.
  • a second perforated inner longitudinal tube 80 is held on the one hand by the second end tube 9 and on the other hand by the transverse inner wall 13.
  • FIG. 5 the external appearance of a silencer has been shown, in the embodiment of FIG. 1.
  • the tubular axial zone 21 of the first casing element 14 and the axial zone corresponding tubular 210 of the second envelope member 15 constitute two end zones of smaller diameter. These two zones can advantageously receive marking collars so that the said collars, when they are in position on the zones 21 and 210, do not exceed the outside diameter of the envelope.
  • FIG. 6 a variant is shown in which the first casing element 14 comprises, on its first transverse end wall 3, two orifices 35 and 36 allowing the inlet and the outlet of the combustion gases respectively, so that the second envelope element 15 comprises a second transverse end wall 4 closed.
  • the first casing element 14 is identical to that of FIG. 5 while the second casing element 15 has a second orifice 6 arranged not in the second transverse end wall 4, which is closed, but in the lateral peripheral wall.
  • the silencer comprises a first casing element 14 and a second casing element 15 associated in the same manner as in the embodiment of FIG. 5, with a weld formed in the intermediate peripheral connection zone 30.
  • a third casing element 37 identical to that shown in FIG. 2, is fitted on the axial zone 210 of the second casing element 15 by its open end, thereby extending the assembly formed by the first two envelope elements 14 and 15.
  • a weld makes it possible to secure the third envelope element 37 to the second envelope element 15, along the entire periphery of the end edge 38 of said third element envelope 37.
  • the silencer is formed of a first casing element 39 identical to that shown in FIG. 2, of relatively great length, associated with a second casing element 40 of much shorter length.
  • the second envelope element 40 may consist of a part of the same shape as the transverse intermediate wall 13 shown in FIG. 1, that is to say comprising a radial part 19 of FIG. 2 and a zone tubular axial 21.
  • FIG 10 there is shown an embodiment to four casing elements associated longitudinally with one another, namely: a first casing element 14, a second casing element 15 respectively forming the two ends of the silencer, and adapted to end tubes 7 and 9.
  • the first casing element 14 is adapted by its edge 17 to the tubular axial zone of smaller section of a third casing element 41 itself welded edge to edge according to the peripheral weld zone 44 to a fourth element d envelope 42, itself receiving, on its axial tubular zone of smaller section, the edge 32 of the second envelope element 15.
  • a lateral orifice 43 for gas passage is provided in the weld zone 44 of the elements envelope 41 and 42.
  • the invention is compatible not only with internal structures of muffler with a perforated tube passing through, as shown in the figures, but also with any other internal structure of muffler.

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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)
EP90420190A 1989-04-25 1990-04-13 Modularer Schalldämpfer Withdrawn EP0395540A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8905937A FR2646207A1 (fr) 1989-04-25 1989-04-25 Silencieux modulaire
FR8905937 1989-04-25

Publications (1)

Publication Number Publication Date
EP0395540A1 true EP0395540A1 (de) 1990-10-31

Family

ID=9381414

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90420190A Withdrawn EP0395540A1 (de) 1989-04-25 1990-04-13 Modularer Schalldämpfer

Country Status (5)

Country Link
US (1) US5020631A (de)
EP (1) EP0395540A1 (de)
JP (1) JPH02301611A (de)
FR (1) FR2646207A1 (de)
PT (1) PT93854A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998001654A1 (de) * 1996-07-03 1998-01-15 Zeuna-Stärker GmbH & Co. KG Abgasreinigungsvorrichtung für einen verbrennungsmotor sowie verfahren zu ihrer herstellung
WO2011144621A1 (de) 2010-05-18 2011-11-24 Heinrich Gillet Gmbh Abgasschalldämpfer für brennkraftmaschinen und tiefziehwerkzeug hierfür
WO2022101044A1 (de) * 2020-11-16 2022-05-19 Umfotec Gmbh Schallminderer und verfahren zu dessen herstellung
US11421568B2 (en) * 2020-01-03 2022-08-23 Tenneco Automotive Operating Company Inc. Muffler with internally supported tuner

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Publication number Priority date Publication date Assignee Title
DE4410624C2 (de) * 1994-03-26 1997-12-11 Rheinmetall Ind Ag Schalldämpfer für Waffen
DE4410625C2 (de) * 1994-03-26 1997-07-03 Rheinmetall Ind Ag Schalldämpfer für Waffen
FR2736966B1 (fr) * 1995-07-17 1997-10-17 Ferri Alain Silencieux d'echappement pour moteur a explosion, pour aeronef
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JP6087679B2 (ja) * 2013-03-21 2017-03-01 本田技研工業株式会社 エンジン用マフラ
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JP6981848B2 (ja) * 2017-11-08 2021-12-17 トヨタ自動車株式会社 排気消音装置
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WO2011144621A1 (de) 2010-05-18 2011-11-24 Heinrich Gillet Gmbh Abgasschalldämpfer für brennkraftmaschinen und tiefziehwerkzeug hierfür
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WO2022101044A1 (de) * 2020-11-16 2022-05-19 Umfotec Gmbh Schallminderer und verfahren zu dessen herstellung

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JPH02301611A (ja) 1990-12-13
PT93854A (pt) 1990-11-20
FR2646207A1 (fr) 1990-10-26

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