EP3179066A1 - Silencieux et procédé de fabrication - Google Patents

Silencieux et procédé de fabrication Download PDF

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Publication number
EP3179066A1
EP3179066A1 EP16202004.4A EP16202004A EP3179066A1 EP 3179066 A1 EP3179066 A1 EP 3179066A1 EP 16202004 A EP16202004 A EP 16202004A EP 3179066 A1 EP3179066 A1 EP 3179066A1
Authority
EP
European Patent Office
Prior art keywords
housing
inner bottom
cone
exhaust pipe
collar
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.)
Granted
Application number
EP16202004.4A
Other languages
German (de)
English (en)
Other versions
EP3179066B1 (fr
Inventor
Jürgen Häberle
Thomas Rose
Michael Ihring
Arnulf Spieth
Benjamin Hirsch
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
Eberspaecher Exhaust Technology GmbH and Co KG
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 Eberspaecher Exhaust Technology GmbH and Co KG filed Critical Eberspaecher Exhaust Technology GmbH and Co KG
Publication of EP3179066A1 publication Critical patent/EP3179066A1/fr
Application granted granted Critical
Publication of EP3179066B1 publication Critical patent/EP3179066B1/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
    • 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
    • F01N1/083—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using transversal baffles defining a tortuous path for the gases or successively throttling gas flow
    • 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
    • F01N1/04—Silencing apparatus characterised by method of silencing by using resonance having sound-absorbing materials in resonance chambers
    • 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
    • F01N1/089—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using two or more expansion chambers in series
    • 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
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/161—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general in systems with fluid flow
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • 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
    • 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
    • F01N2490/08—Two or more expansion chambers in series separated by apertured walls only

Definitions

  • the present invention relates to a muffler for an exhaust system of an internal combustion engine.
  • the invention also relates to a method for producing such a silencer.
  • a muffler usually has a housing in which one or more chambers may be formed to perform various muffling functions.
  • an intermediate or inner bottom is disposed between adjacent chambers in the housing, which rests on the edge of the housing to support loads.
  • pipes that run in the housing are firmly connected to such an inner bottom.
  • this is a constellation in which such a tube is attached on the one hand to the housing and on the other hand to such an inner bottom.
  • a kind of axial sliding seat can be formed between an edge of the inner circumference of the inner base and the housing.
  • the collar With its outer side facing the housing, lies radially on an inner side of the housing, at least at ambient temperature.
  • axial and radial refer to a normal axis which is perpendicular to a plane in which the respective inner bottom extends.
  • the muffler heats up, wherein the housing on the one hand and the respective tube and the respective inner bottom on the other hand can expand thermally different.
  • the exhaust-carrying tubes and the housing are regularly made of different materials within a muffler, which have different thermal expansion coefficients.
  • the inner bottom can be made of the same material as the tube, so that the intermediate bottom expands differently than the housing.
  • the different temperatures can lead to thermally induced relative movements, even if the different components are made of the same or similar materials.
  • Conceivable therefore, are embodiments in which the housing and the tube are each made of ferrite or austenite in each case.
  • the heating of the muffler thus leads on the one hand to the fact that the tube expands or displaces in its longitudinal direction relative to the housing. This leads within the housing to an axial displacement of the fixed to the pipe intermediate floor.
  • the housing in the radial direction can expand more than the inner bottom, for example, if the intermediate floor and housing made of different materials.
  • the housing of said collar can at least partially lift off radially. This creates the risk of loss of adhesion between the housing and the inner bottom, which is associated with a free movement between the inner bottom and housing in the radial direction and in the axial direction.
  • the present invention seeks to remedy this situation.
  • the invention is concerned with the problem of providing for such a silencer or for an associated manufacturing method, an improved embodiment, which is characterized in particular by a reduced noise and / or by a reduced wear and / or an improved fatigue strength.
  • the invention is based on the general idea not to align the collar axially, but inclined to the axial direction and to create a matching, complementary contour on the housing, so that the inclined collar rests flat against the inclined contour.
  • An angle of inclination of the collar with respect to the axial direction is greater than 0 ° and less than 90 °.
  • the angle of inclination is between 5 ° and 85 °.
  • the angle of inclination may be between 15 ° and 75 °.
  • a preferred angular range for the inclination angle extends from 30 ° to 60 °.
  • the inclination of the collar shows up in the profile of the collar, which is present in a section perpendicular to the direction of rotation of the collar.
  • the collar forms a cone in the silencer presented here, which is recognizable at least in the profile.
  • a cone is usually circular and rotationally symmetric with respect to a longitudinal central axis
  • the cone on the collar of the inner bottom is not limited to such a circular or rotationally symmetric geometry. It is only important that the cone in the profile of the collar is recognizable, namely by the inclined collar or a ramp-shaped contour.
  • the cross section of the housing in the region of the inner bottom can then have virtually any geometry, so that in particular circular, elliptical, oval and any non-circular geometries are possible. Cross-sectional geometries with corners are basically also conceivable, for example in the region of a contact zone, in which two housing parts are fastened to one another when the housing is in several parts and, for example, assembled from two half shells.
  • the collar forms a cone on its outer side facing the housing in profile
  • the housing is equipped on its inner side in the region of the inner bottom with an edge facing, circumferential contour which forms a conical profile in profile, which is shaped to complement the cone
  • the cone and conical seat are coordinated so that the cone rests flat against the conical seat.
  • the cone lies loosely on the conical seat.
  • loosely fitting is meant that the cone is in contact with the cone seat but is not attached thereto.
  • the contact can be biased.
  • the loose contact can be transmitted via the friction in the shear direction forces between the inner bottom and housing, so that there is also a non-positive contact or a frictional connection.
  • This frictional connection is greater, the greater the optionally provided bias voltage is selected in the contact between the cone and conical seat. For example, vibration and vibrations can be dampened via the frictional connection.
  • the inner bottom is a separate component with respect to the housing.
  • the collar of the inner bottom and the contour of the housing completely encircling or interruption-free. In this way, the surface contact between cone and conical seat in the circumferential direction of the collar can be ensured without interruption.
  • the collar and / or contour can also have interruptions in the direction of rotation or can only be formed by individual circumferential segments.
  • at least three collar segments are provided, which cooperate with at least three contour segments. It is also conceivable to provide a plurality of circumferentially distributed collar on the inner bottom, which interact with a circumferential contour or with a plurality of correspondingly distributed, individual contours.
  • the inner bottom can be axially biased, so that the cone bears axially biased on the conical seat.
  • the axial Bias of the inner bottom is present at least at a mounting temperature of the muffler and can be chosen so large that it leads to an elastic deformation of the inner bottom, in particular to a bulge of the inner bottom.
  • the mounting temperature of the silencer is the temperature at which the installation of the silencer takes place. In other words, these are the room or ambient temperatures prevailing during installation.
  • the individual components that are installed during assembly also have this temperature as long as no plastic forming processes that generate heat in the material, or thermal joining operations, such as welding or soldering, are performed.
  • This design has the advantage that in the event that the housing thermally due to the inner bottom greatly expands or expands and that the inner bottom can not be adjusted sufficiently by the expansion of the tube to compensate for this, the inner bottom, the required axial adjustment can perform automatically, which is required to maintain the contact between cone and conical seat.
  • the inner bottom is automatically axially axially tracked in a radial expansion of the housing by the axial bias to maintain contact between the cone and conical seat.
  • the cone and the conical seat can form a conical sliding seat, which allows an axial and radial relative displacement between the inner bottom and the housing while still allowing the flat contact of the cone on the conical seat.
  • a conical sliding seat combines an axial adjustability with a radial adjustability between cone and conical seat, so that in all permissible relative positions of inner bottom to housing a flat contact between the cone and conical seat is always guaranteed.
  • the housing may be mounted biased radially inwards, so that the inner bottom is dented elastically in its preferred direction at least at installation temperature and the cone biased rests on the conical seat. Due to this prestressed installation, thermally induced expansion effects can be taken into account, such that the relative movements resulting therefrom during operation are smaller and, in particular, compensated. Due to the thermal expansion, the preload is first reduced before a relative movement takes place. This makes it possible to realize a compensation of the thermal expansion even in a wide temperature range, without resulting in relative movements. Such a radial bias between the housing and inner bottom is favored by the cone and the conical seat, as a result, a defined elastic buckling of the inner bottom is possible.
  • the muffler may have at least one exhaust pipe, which is fixed at one end to the housing and the other end to the inner bottom.
  • This is expediently an inlet pipe or an outlet pipe, which is guided into or out of the housing.
  • the exhaust pipe is expediently passed through the inner bottom.
  • the exhaust pipe is passed through the one chamber, while it opens in the other chamber.
  • the inner bottom is determined indirectly on the housing.
  • the attachment of the exhaust pipe to the housing forms a fixed bearing, while the support of the inner bottom forms a floating bearing on the housing.
  • thermally induced changes in length of the exhaust pipe lead to relative movements between the housing and inner bottom. These can take place through the cone in conjunction with the conical seat, without endangering the surface contact between the cone and conical seat.
  • the respective exhaust pipe is with respect to the inner bottom and with respect to the housing a separate component.
  • the tube can be mounted axially biased, so that the inner bottom deformed elastically in its preferred direction at least at mounting temperature, in particular dented, and the cone is axially biased or frictionally applied to the conical seat.
  • this measure also leads to an anticipation of thermal expansion effects, but in this case in the axial direction. Consequently, the thermally induced relative movements between inner bottom and housing take place only at higher temperatures, in which the bias generated during assembly is reduced.
  • the bias is chosen so that even at high temperatures, a bias is still present.
  • the tube may consist of a first material, for example a ferritic steel, which has a first coefficient of thermal expansion which is smaller than a second thermal expansion coefficient of a second material, for example an austenitic steel of which the housing is made ,
  • a first material for example a ferritic steel
  • a second thermal expansion coefficient of a second material for example an austenitic steel of which the housing is made
  • the tube inherently has a smaller coefficient of thermal expansion than the housing, so that at elevated temperatures it expands less than the housing.
  • the tube is exposed to significantly higher temperatures than the housing, so that the exhaust pipe ultimately expands axially during operation of the exhaust system axially stronger than the housing.
  • the inner bottom can then be made of the same material as the exhaust pipe, ie from the first Werksoff, or as the housing, ie from the second material.
  • the inner bottom regardless of whether such a tube is present or not, from a first material, for example, a ferritic steel, consist of a first thermal Has expansion coefficients smaller than a second coefficient of thermal expansion of a second material, for example an austenitic steel constituting the housing.
  • a first material for example, a ferritic steel
  • a second material for example an austenitic steel constituting the housing.
  • the tube is made of an austenitic steel, whereby it has a relatively high coefficient of thermal expansion and can track the inner bottom better in the axial direction.
  • it may be provided to also produce the tube from a ferritic steel.
  • the inner bottom and / or the exhaust pipe on the one hand and the housing on the other hand consist of the same material.
  • the inner bottom and the housing in a second case, the exhaust pipe and the housing and in a third case, the inner bottom, the exhaust pipe and the housing have the same coefficient of thermal expansion.
  • thermally induced relative movements can be compensated for by the interaction of cone and conical seat, so that in the ideal case there is no loss of contact between inner bottom and housing.
  • a cone angle, the cone and the conical seat relative to the axial direction, and the thermal expansion coefficients of housing, inner bottom and exhaust pipe to be coordinated so that a radial expansion of the housing relative to the inner bottom by an axial extension of the exhaust pipe to Housing is compensated in the conical sliding seat, such that a flat contact between the cone and conical seat is maintained.
  • the cone angle should be selected as approximately 45 °.
  • the cone angle should be less than 45 °.
  • the cone angle should be greater than 45 °.
  • the housing may be configured in shell construction, so that it has in particular a lower shell and an upper shell, which are fastened to one another in a contact region.
  • the housing may have in the region of the inner bottom on its inner side a groove-like depression which is oriented outwards and into which the collar engages and in which the contour is located which forms the conical seat in profile.
  • the cone structure of the collar and contour virtually only on the outside of the housing, so that inside the housing no structural changes are required.
  • the housing in the region of the inner bottom on its inner side with a bead-like elevation, which is oriented inwards and at which the contour is that forms the cone seat in profile.
  • the conical structure of the inner bottom and the inner housing bears on the housing.
  • An inventive method for producing a silencer of the type described above comprises according to a first embodiment, the following steps: First, the inner bottom is inserted into a lower shell of the housing. Subsequently, an upper shell is placed on the lower shell, wherein the inner bottom is resiliently dented in its preferred direction. In other words, the upper shell is placed under radial prestress on the lower shell, such that the inner floor elastically bulges in its preferred direction. Subsequently, the upper shell is attached to the lower shell, while the inner bottom is elastically bulged, so that subsequently the housing is mounted biased radially inwards.
  • the advantages of radially biased mounting are described above.
  • the method according to the invention comprises the following steps: First, the inner bottom with the exhaust pipe attached thereto is inserted into a lower shell of the housing. Subsequently, an upper shell of the housing is placed on the lower shell. Thereafter, the exhaust pipe is pushed inwardly until the inner bottom elastically bulges in its preferred direction. In other words, an axial prestress is generated on the inner bottom via the exhaust pipe, such that the inner bottom elastically bulges in its preferred direction. Subsequently, the exhaust pipe is fixed to the housing, while the inner bottom is elastically bulged, so that then the exhaust pipe is mounted axially biased inwards.
  • the advantages of the axially biased exhaust pipe are described above.
  • the attachment of the upper shell to the lower shell can be done before or after the axial biasing of the exhaust pipe or simultaneously with the fixing of the exhaust pipe to the housing.
  • the production of the muffler takes place at a mounting temperature, which may be, for example, in a range of about 15 ° C to 35 ° C depending on the place of manufacture.
  • FIGS. 1 to 8 comprises a muffler 1, which is intended for use in an exhaust system of an internal combustion engine, preferably a motor vehicle, a housing 2, in which at least two chambers 3 are formed, wherein between each two chambers 3 in the housing 2, an inner bottom 4 is provided.
  • the housing 3 contains exactly three chambers 3, which are used to distinguish according to the in Fig. 1 3l for the left-hand chamber 3, 3r for the right-hand chamber 3 and 3m for the middle chamber 3 can be designated.
  • two inner floors 4 are present, which, according to their arrangement in Fig. 1 can also be referred to as left inner bottom 4l or right inner bottom 4r.
  • the muffler 1 is also equipped with at least one exhaust pipe 5, which at one end to the housing 2 and at the other end to such Inner bottom 4 is attached.
  • the muffler 1 four such exhaust pipes 5, wherein in the sectional views of Fig. 1 and 2 only two such exhaust pipes 5 are recognizable.
  • a possible sectional plane II of the sectional view of Fig. 1 is in Fig. 2 indicated.
  • two inlet pipes 5e and two outlet pipes 5a are provided. The inlet pipes 5e penetrate the left chamber 3l and open in the middle chamber 3m.
  • the outlet pipes 5a pass through the right chamber 3r and are openly arranged in the middle chamber 3m.
  • the middle chamber 3m serves here as an expansion chamber and as an overflow chamber to guide the exhaust gas from the inlet pipes 5e to the outlet pipes 5a.
  • the left-hand chamber 3l and the right-hand chamber 3r serve here each as an absorption chamber and are each filled with a sound-absorbing substance 6 for this purpose. This sound-absorbing material 6 is in the sectional view of Fig. 2 not shown.
  • at least one of the inlet pipes 5e and / or at least one of the outlet pipes 5a can be provided with a perforation.
  • the exhaust pipes 5 are imperforated.
  • the acoustic coupling then takes place via an in Fig. 2 visible and exemplarily formed by a plurality of openings perforation 20 in the respective inner bottom 4.
  • the absorption chambers 3l, 3r acoustically coupled through the perforated inner floors 4l, 4r with the expansion chamber 3m, which in turn is acoustically coupled via the exhaust pipes 5 with the exhaust stream 7.
  • the respective inner bottom 4 has at least one edge-side collar 8, which has an outer side 9 facing the housing 2.
  • this outside 9 forms according to the longitudinal sections of Fig. 1 and 3 to 8 a cone 10.
  • the housing 2 has now at its the chambers 3 facing inside 11 in the region of the respective inner bottom 4 at least one collar 8 facing contour 12.
  • This contour 12 forms in the profile of the sectional views of a cone 10 complementary conical seat 13 to which the cone 10 flat and loose, preferably non-positively applied. Visible taper cone 12 and conical seat 13 axially in the direction in which the connected to the respective inner bottom 4 exhaust pipe 5 expands when heated.
  • FIG. 2 In the sectional view of Fig. 2 two different embodiments A and B are shown separated by the section line II.
  • the collar 8 and the cone 10 and the contour 12 and the conical seat 13 are designed in a circumferential direction 14 completely circumferential. Only the contour 12 or the conical seat 13 can have an interruption in the region of a contact or joining zone 15 in which an upper shell 16 of the housing 2 is fastened to a lower shell 17 of the housing 2.
  • an efficient sealing of the respective inner bottom 4 in the region of the collar 8 on the housing 2 is realized in the circumferential or circumferential direction 14 at the same time.
  • Fig. 2 in the right reproduced second embodiment B a variant in which a plurality of collars 8 are arranged distributed in the circumferential direction 14, which can also be referred to as collar segments 8. Accordingly, then also a plurality of cone segments 10 may be formed. Similarly, then also the contour 12 and the conical seat 13th be formed by corresponding individual segments. Shown, however, is an embodiment in which the contour 12 and the conical seat 13 are configured continuously in the circumferential direction 14, apart from the interruption in the joining zone 15.
  • the housing 2 is provided in the region of the inner bottom 4 on its inner side 11 with a recess 18, in which the collar 8 engages.
  • this recess 18 is the contour 12, which forms the cone seat 13 in profile.
  • the housing 2 in the region of this inner bottom 4 on its inner side 11 equipped with a protrusion 19 which projects into the interior of the housing 2.
  • the contour 12 is formed, which forms the cone seat 13 in profile.
  • the inner bottom 4 may be axially biased at least at an assembly temperature.
  • An axial preload is in the Fig. 3 . 7 and 8 indicated by an arrow and designated 21.
  • the axial bias 21 causes an axially biased concerns of the cone 10 on the conical seat 13th cone 10 and conical seat 13 expediently form a conical sliding seat 22.
  • Such a conical sliding seat 22 can allow axial and radial relative position between the inner bottom 4 and housing 2 and each other couple frictionally and continue to allow a flat contact between cone 10 and cone seat 13.
  • An axial adjustment between inner bottom 4 and housing 2 is in Fig. 4 indicated by an arrow and designated 23.
  • a radial adjustment between the housing 2 and inner bottom 4 is in Fig.
  • the axial prestress 21 is expediently generated via the exhaust pipe 5, which is supported on the one hand on the housing 2 and on the other hand on the inner bottom 4.
  • the axial preload 21 may already be present at ambient temperature, namely, when the exhaust pipe 5 is mounted with such axial bias.
  • the exhaust pipe 5 can also provide for the axial prestressing 21 during operation of the exhaust system, namely if the exhaust pipe 5 expands more strongly in the axial direction than the housing 2 during operation of the exhaust system, which results in an axial relative displacement of the inner bottom 4 relative to the housing 2 goes along.
  • a radial bias is in the Fig. 3 . 5 and 6 indicated by an arrow and designated 25.
  • the radial bias 25 causes a biased contact of the cone 10 at the conical seat 13th
  • the exhaust pipe 5 and the inner bottom 4 expediently consist of a first material, which is, for example, a ferritic steel.
  • the first material has a first thermal expansion coefficient.
  • the housing 2 is made of a different material, namely of a second material, which may be, for example, an austenitic steel.
  • the second material has a second thermal expansion coefficient.
  • the first thermal expansion coefficient is smaller than the second expansion coefficient.
  • the states are reproduced that set at operating temperature.
  • the housing 2 expands relative to the inner bottom 4 to the outside.
  • the inner bottom 4 is displaced axially relative to the housing 2 by the expansion of the exhaust pipe 5.
  • the conical sliding seat 22 can compensate for these relative movements 23, 24 and permanently maintain a flat contact between cone 10 and conical seat 13.
  • the axial direction is defined in the present case by an axis 26 which is perpendicular to a plane 27 in which the respective inner bottom 4 extends.
  • a longitudinal central axis 28 of the housing 2 extends parallel to the axis 26.
  • the exhaust pipes 5 in this example extend substantially parallel to the axis 26th
  • an in Fig. 3 indicated cone angle 29, the cone 10 and the conical seat 13 relative to the axial direction 26, depending on the thermal expansion coefficient of the housing 2, inner bottom 4 and exhaust pipe 5 to be selected, in such a way that the radial extent 24 of the housing 2 relative to the inner bottom 4 is compensated by an axial extension 23 of the exhaust pipe 5 to the housing 2 in the conical sliding seat 22.
  • the surface contact between cone 10 and cone seat 13 is maintained.
  • FIGS. 5 and 6 can such a silencer 1 are prepared according to a first method so that first the inner bottom 4 is inserted into the lower shell 17 of the housing 2, wherein then the upper shell 16 is placed on the lower shell 17 while a radial bias is generated, the elastic buckling in the preferred direction of the inner bottom 4 causes.
  • Fig. 6 Such a bulge 30 of the inner bottom 4 is shown elevated.
  • the upper shell 16 is fastened to the lower shell 17, which takes place when the inner bottom 4 is tamped, so that subsequently the housing 2 is mounted biased radially inwards. Accordingly, the radial preload 25 is in the mounted state at mounting temperature.
  • the inner bottom 4 is inserted with attached exhaust pipe 5 in the lower shell 17 of the housing 2.
  • the upper shell 16 is placed on the lower shell 17.
  • the exhaust pipe 5 is pressed inwards, such that the inner bottom 4 bulges elastically in the preferred direction. Again, there is a corresponding bulge in Fig. 8 denoted by 30 and exaggerated.
  • the exhaust pipe 5 is fixed to the housing 2, while the inner bottom 4 is resiliently bulged in the preferred direction.
  • the exhaust pipe 5 is thus mounted biased axially inwards.
  • the corresponding axial bias 21 is in the FIGS. 7 and 8 indicated by arrows.
  • the upper shell 16 is placed on the lower shell 17 after the insertion of the inner bottom 4 with the exhaust pipe 5 fastened thereto into the lower shell 17, to produce the radial prestress 25. Subsequently, the upper shell 16 is attached to the lower shell 17 in order to ensure or preserve the radial prestressing 25 between the housing 2 and the inner bottom 4.
  • the exhaust pipe 5 remains relative to the housing 2 adjustable. Thereafter, the exhaust pipe 5 is pushed inwardly to generate the axial bias 21. Subsequently, the exhaust pipe 5 is attached to the housing 2 with applied axial bias 21 to now also the axial bias 21 between inner bottom 4 and housing 2 to guarantee or preserve.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Exhaust Silencers (AREA)
EP16202004.4A 2015-12-07 2016-12-02 Silencieux et procédé de fabrication Active EP3179066B1 (fr)

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JP6480741B2 (ja) * 2015-02-04 2019-03-13 株式会社神戸製鋼所 消音器
DE102018101139A1 (de) * 2018-01-19 2019-07-25 Eberspächer Exhaust Technology GmbH & Co. KG Schalldämpferbaugruppe

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EP2354483A2 (fr) * 2010-02-05 2011-08-10 J. Eberspächer GmbH & Co. KG Silencieux

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US3987868A (en) * 1971-02-23 1976-10-26 Betts William M Silencing device for internal combustion engines
JPS59155528A (ja) * 1983-02-25 1984-09-04 Honda Motor Co Ltd 消音器
EP1967709A1 (fr) * 2007-03-09 2008-09-10 J. Eberspächer GmbH Co. KG Dispositif de traitement des gaz d'échappement et son procédé de fabrication
EP2354483A2 (fr) * 2010-02-05 2011-08-10 J. Eberspächer GmbH & Co. KG Silencieux

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EP3179066B1 (fr) 2019-02-13
CN106917656A (zh) 2017-07-04
US20170159520A1 (en) 2017-06-08
CN106917656B (zh) 2019-05-28
US10174654B2 (en) 2019-01-08
DE102015224453A1 (de) 2017-06-08

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