EP0353761B1 - Abgas-Schalldämpfer - Google Patents

Abgas-Schalldämpfer Download PDF

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Publication number
EP0353761B1
EP0353761B1 EP89114390A EP89114390A EP0353761B1 EP 0353761 B1 EP0353761 B1 EP 0353761B1 EP 89114390 A EP89114390 A EP 89114390A EP 89114390 A EP89114390 A EP 89114390A EP 0353761 B1 EP0353761 B1 EP 0353761B1
Authority
EP
European Patent Office
Prior art keywords
mineral wool
muffler
silencer
housing
parts
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.)
Expired - Lifetime
Application number
EP89114390A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0353761A1 (de
Inventor
Gustav Schweinfurth
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.)
Saint Gobain Isover G+H AG
Original Assignee
Gruenzweig und Hartmann AG
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 Gruenzweig und Hartmann AG filed Critical Gruenzweig und Hartmann AG
Priority to AT89114390T priority Critical patent/ATE96885T1/de
Publication of EP0353761A1 publication Critical patent/EP0353761A1/de
Application granted granted Critical
Publication of EP0353761B1 publication Critical patent/EP0353761B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01N1/08—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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/24—Silencing apparatus characterised by method of silencing by using 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
    • 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
    • F01N13/1838—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
    • 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
    • F01N13/1861—Construction facilitating manufacture, assembly, or disassembly the assembly using parts formed by casting or moulding
    • 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
    • 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
    • F01N2310/00—Selection of sound absorbing or insulating material
    • F01N2310/02—Mineral wool, e.g. glass wool, rock wool, asbestos or the like
    • 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
    • F01N2310/00—Selection of sound absorbing or insulating material
    • F01N2310/04—Metallic wool, e.g. steel wool, copper wool or the like
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/02—Tubes being perforated
    • 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
    • F01N2470/06—Tubes being formed by assembly of stamped 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/10—Tubes having non-circular cross section
    • 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
    • F01N2470/18—Structure or shape of gas passages, pipes or tubes the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49398—Muffler, manifold or exhaust pipe making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49893—Peripheral joining of opposed mirror image parts to form a hollow body

Definitions

  • the invention relates to an exhaust gas silencer according to the preamble of claim 1.
  • the exhaust pipe is provided over a portion of its length with circumferential perforations through which vibrational energy of the exhaust gases can escape into the space surrounding the exhaust pipe.
  • This space is surrounded over the length of the perforation with a closed silencer housing in which a mineral wool filling is arranged, the sound-absorbing effect of which destroys the vibration energy emerging from the exhaust pipe.
  • the mineral wool manufacturer has already brought the mineral wool into the shape required for the filling and has to deliver it to the silencer manufacturer, in which case these molded parts are then only to be inserted into the silencer housing.
  • a disadvantage of this method is that there is a considerable amount of work involved in introducing the mineral wool into the mold and removal from the mold, and considerable additional effort is involved in the hardening process, since the hardening in the tunnel kiln integrated in the production process cannot be used as it is for the Manufacturing of felts or sheets for standard products is common. Hardening in the special form therefore requires special investments and additional energy expenditure and can also hinder the production process on the part of the mineral wool manufacturer.
  • the mineral wool can also be applied a little thicker to the built-in part, since it gives way before the hardening under the pressure of the mold housing that is subsequently to be applied.
  • the composite component formed from the built-in part and the hardened mineral wool is removed from the mold housing and delivered to the silencer manufacturer, who can have this composite component assembled in an extremely simple manner by pushing it sideways into the actual silencer housing.
  • the invention has for its object to provide an exhaust gas muffler of the type known from the generic prior art, which not only enables a reduction in transport costs in its manufacture if necessary, but also without the use of expensive measures for shape stabilization, especially without previous curing is producible.
  • the present invention relates in particular to a muffler with a regionally perforated built-in part serving for the passage of an exhaust gas flow and a filling of mineral wool layers arranged in the cavities between the built-in part and the muffler housing
  • Mineral wool felt provided with an impregnation agent, the overlays being pre-assembled in accordance with their respective position in the silencer, and the silencer housing in its meridian plane can be divided into two housing halves and permanently closed at the division level, impregnated connection parts being used as supports for the built-in part before no heat treatment was carried out when the silencer housing was closed.
  • the invention is based on the knowledge that, for example, pre-resin-coated or otherwise suitably impregnated mineral wool overlays have a good interior Have fiber cohesion, but are still soft and shapeable and hold the compressed form largely when compressed, i.e. spring back only slowly and incompletely. This makes it possible to plastically deform such overlays by hand and thereby compress them - essentially remaining for a short period of time.
  • a coating delivered with a standard bulk density in the order of magnitude of, for example, 50 kg / m3 and not brought to a significantly increased bulk density as part of an immediately preceding pretreatment can be hand-made during its processing to a much higher bulk density of, for example, 150 kg / m3 be compressed; after the pressure force has been removed, there is still enough time before springback occurs to mount the support in a partially compressed, relatively low volume state in the muffler and to close the muffler housing without excess mineral wool volume being jammed on contact surfaces of the metallic muffler components .
  • the invention is based on the further realization that working with such resin-coated pads - unlike when inserting loose mineral wool - does not lead to major time delays in the silencer assembly itself and does not make any special demands on the care and skill of the assembly personnel if the pads correspond to the Installation conditions of the silencer to be manufactured in a precise manner, pre-assembled for the respective installation site. Then it is possible to use the thus made-up parts instead of dimensionally stabilized parts directly during the installation of the silencer without fear of adverse effects on the workflow there, especially since the precise parts make it possible to use the parts with the largest possible dimensions, which, moreover, reproducible achievement of the target quantity to be introduced and the desired density distribution guaranteed.
  • the invention therefore proposes to supply such impregnated, for example pre-resin-coated pads as ready-made parts, for example in the form of blanks, stamped parts or the like.
  • shape-stabilized molded parts instead of shape-stabilized molded parts to the mounting location of the silencer and to install them there in the silencer itself.
  • the use of a muffler housing divided in the meridian plane makes it easy to precisely position the built-in part of the muffler with the pre-assembled cushions. Then the silencer housing is closed in the meridian plane - similar to the mold housing in the generic state of the art.
  • a binding agent does not necessarily have to be used for the impregnation of the ready-made parts, which makes them soft and pliable, but any other suitable liquid impregnating agent can be used, since after installation in the muffler the binding agent is essentially without function and when the motor vehicle is started up burns away in a short time.
  • the impregnation agent can thus be selected from other points of view, such as the environmental compatibility when operating the motor vehicle, the good and inexpensive availability, the good and pleasant processability, etc.
  • the silencer assembly can also be carried out at the mineral wool manufacturer to relieve the operation of the silencer manufacturer of this effort; Since the original housing of the silencer is then transported in addition to the procedure according to DE-OS 32 38 638 for the installation part or for the composite component, the transport costs are therefore slightly increased, but there is no assembly effort on the part of the silencer manufacturer, who only delivers the metal parts he has made to the mineral wool manufacturer and receives the finished silencer back.
  • the transportation effort can, as far as the timing of the delivery permits, be reduced overall by the mineral wool manufacturer immediately delivering the muffler he has assembled to the customer of the muffler manufacturer, i.e. the automobile manufacturer, and thus the transport from the muffler manufacturer to the automobile manufacturer is no longer necessary; this is possible within the scope of the invention because after the silencer housing has been closed and after the impregnated mineral wool pads have been introduced, no further work is required on the silencer.
  • the measure of claim 2 results in a simple way of reducing the density difference.
  • the metal wool can either be pushed onto a straight exhaust pipe in the form of a metal fiber stocking in the course of assembly before being fitted with a fitting part, or in some other way, for example by spot soldering Installation part are secured in position, or, according to claim 4, are fastened to the side of the ready-made parts facing the installation part in the installation position.
  • this attachment can be done mechanically, for example, by quilting, or by means of an adhesive, which, however, does not require any heat to impair the impregnation of the mineral wool in order to harden it.
  • a metal fiber layer can only be pressed onto the mineral wool assembly part for sufficient attachment, in order to achieve sufficient positional security for handling the composite parts thus formed during assembly by clawing and adhesion effects.
  • a variety of liquids are suitable as impregnation agents, as is the usual synthetic resin binder for such mineral wool.
  • a water-oil emulsion is preferred, which additionally results in an improved fiber-fiber adhesion of the mineral wool and thus a stabilization of the outline shape of the finished part.
  • Such an emulsion is known for example from DE-OS 36 16 454, to which reference is made for further details. While the water evaporates residue-free and without any environmental pollution during the operation of the motor vehicle, the environmental pollution caused by the oil component is extremely low. In addition to good and inexpensive availability, such an emulsion also has the advantage of pleasant handling the assembly parts during assembly.
  • an exhaust gas muffler consists of a housing 1 with an upper housing half 1a and a lower housing half 1b as well as an installation part 2 and a filling 3 made of mineral wool, which is arranged between the installation part 2 and the muffler housing 1, in the example case in the form of 4 assembly parts 3a, 3b, 3c and 3d.
  • the installation part 2 has a front connection piece 4 and a rear connection piece 5 for connection to the exhaust pipe, which is no longer shown, for example in the exhaust system of a motor vehicle. Between the connecting pieces 4 and 5, the installation part 2 has a pipe section 7 provided with perforations 6.
  • the pipe section 7 made of metal is made in the example from two halves which are connected to one another on a flange 8 lying in the meridian plane.
  • the pipe section 7 is arranged on the circumference of a radially arranged spacer 9 with a radially outer circumferential support web 10, the contour of which corresponds to the inner contour of its contact area in the silencer housing 1.
  • passage openings 11 and 12 are provided for the connecting pieces 4 and 5 of the installation part 2.
  • the through openings 11 and 12 are in each case arranged on the housing half 1a and the housing half 1b as half-sockets 11a, 12a and 11b, 12b, which, when the silencer housing 1 is closed, encompass the connecting pieces 4 and 5 on both sides.
  • the support web 10 lies freely against a corresponding contact surface of the muffler housing 1 and thus secures the desired position of the mounting part 2 in the muffler housing 1.
  • an additional layer 14 of metal wool can be introduced between the outer circumference of the pipe section 7 in the area of the perforations 6 and the inner circumference of the filling 3, which layer picks up the mineral wool before it is exposed to the hot Exhaust gas protects.
  • An alternative procedure is to cover the original built-in part 2 with binder-containing, but uncured cushions and to insert it into a mold housing in accordance with the contour of the silencer housing 1 and to harden it there, and to insert the composite component formed in this way into the silencer housing after delivery to the silencer manufacturer .
  • the bulk density of one without essential pre-compression mineral wool felt in the order of 50 kg / m3 should be increased considerably by compression to, for example, 150 kg / m3 and more, so that the mineral wool can best perform its intended functions in the silencer.
  • assembly parts 3a, 3b, 3c and 3d which are pre-assembled as a function of the installation conditions in the silencer.
  • the assembly parts 3c and 3d for forming the lower parts of the filling 3 in FIG. 1 are shown in a top view in FIG. 2.
  • they are punched out of a mineral wool sheet with a thickness of 50 mm in an exact shape and have indentations 17, 18 for the area of the connecting pieces 4 and 5.
  • FIG. 2 As can also be seen schematically in the illustration from FIG.
  • the precisely dimensioned indentations 17 and 18 result in a reduced proportion of material in this area and thus in spite of the uniform Height of the assembly parts 3a, 3b, 3c and 3d a reduced material thickness of the filling in this area without crushing.
  • the exact contour of the assembly parts 3a, 3b, 3c and 3d can best be determined by experiment; in any case, it is ensured that a contour resulting in a suitable deformation is available and that the compression always reproducibly executes the same shape changes.
  • the, for example, impregnated but uncured parts 3a, 3b, 3c and 3d differ in their consistency very considerably from loose mineral wool which does not contain or is not impregnated; because the impregnation results in an increased suppleness and an improved cohesion of the fibers, so that the ready-made parts can be deformed plastically and, if not too strongly deformed, tend only very slowly in the sense of springback to return to their original shape.
  • the compressed form is initially retained after the pressure has been removed and is only partially reset very slowly in the sense of springing open again.
  • the cohesion of the fibers is so good that fraying or the like of the edges of the assembly parts denoted by 19 does not occur even in the course of their plastic deformation, but rather as a smooth surface preserved.
  • the lower assembly parts 3c and 3d in FIG. 1 are first inserted into the lower housing half 1b of the muffler housing 1, whereby they are not or only slightly compressed when inserted. Then the built-in part 2 is inserted into the lower housing half 1b in such a way that the spacer 9 with the supporting web 10 projects into a gap between the made-up parts 3c and 3d, and the built-in part 2 or the pipe section 7 is pressed into the lower made-up parts 3c and 3d , as can be seen from Fig. 3.
  • the pressing of the built-in part 2 has the result that the lateral edges 19 of the ready-made parts 3c and 3d tilt inwards towards the pipe section 7 due to the improved cohesion of the fibers of the mineral wool and thus at a distance from the pipe section Circumferential flange 16 arrive.
  • the good cohesion of the fibers also at the front edges 19 ensures that there are no tufts or fringes in the direction of the metallic structural parts protruding beyond a designated location and could interfere with the mutual contact there.
  • the upper assembly parts 3a and 3b are then correspondingly placed on the built-in part 2 embedded in the assembly parts 3c and 3d and pre-compressed by hand.
  • the two housing halves 1a and 1b can be pressed together to form the finished muffler housing 1, as shown in FIG. 4, the filling 3 being made of mineral wool, without affecting the metallic ones Interfering contact surfaces is pressed into the final desired shape.
  • the assembly parts 3a, 3b, 3c and 3d are predominantly in contact with one another in the flat state with lateral edges 19 in the meridian plane 13, so that in the example of an elliptical muffler housing 1 there is a large amount of mineral wool on both sides of the pipe section 7 and those there fills enlarged space with sufficient density.
  • the width of the assembly parts 3a, 3b, 3c and 3d has been chosen essentially according to the arc length of the wall of the respective housing half 1a or 1b at the installation point, so that, as well Fig. 3 illustrates, nestling of the respective assembly parts on the curvature of the associated housing half results in laterally inwardly standing edges 19 which end in the area of the meridian plane 13 and lead into the bottom surface of the assembly part.
  • the mineral wool of the assembly parts is always deformed during compression in such a way that there is a good filling of all sound-technical gaps and density differences in the mineral wool in the finished silencer are limited.
  • the silencer is hermetically sealed and provided with a proper filling.
  • the special step of curing the Filling if binder is used as the impregnating agent, can be omitted completely, since in this position an additional shape stabilization of the mineral wool is no longer necessary.
  • layers 14 of metal wool in particular in the form of a tube, can be attached to the built-in part, for example pushed on or soldered on, before the filling 3 is applied.
  • a corresponding layer 14 of metal wool or the like to the ready-made parts 3a, 3b, 3c and 3d in advance, for example by quilting or gluing, or simply by adhesion due to mutual fiber clawing.
  • the deformation behavior of the strongly deforming sides of the assembly parts 3a, 3b, 3c and 3d, which are adjacent to the built-in part 2 is changed to a certain extent, which, if necessary, can be used for a targeted local reduction in the deformability.
  • Synthetic resin binder as is usually used for the hardening of mineral fiber molded parts or sheets, has proven to be particularly advantageous with regard to the deformation behavior and handling. However, since curing of the binder is in any case of little importance, another impregnation agent can also be used to bring about the desired consistency and the desired behavior of the finished parts can be used, such as a water-oil emulsion or the like.

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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)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
EP89114390A 1988-08-05 1989-08-03 Abgas-Schalldämpfer Expired - Lifetime EP0353761B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89114390T ATE96885T1 (de) 1988-08-05 1989-08-03 Abgas-schalldaempfer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3826707 1988-08-05
DE3826707A DE3826707A1 (de) 1988-08-05 1988-08-05 Verfahren zum herstellen eines abgas-schalldaempfers

Publications (2)

Publication Number Publication Date
EP0353761A1 EP0353761A1 (de) 1990-02-07
EP0353761B1 true EP0353761B1 (de) 1993-11-03

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ID=6360336

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89114390A Expired - Lifetime EP0353761B1 (de) 1988-08-05 1989-08-03 Abgas-Schalldämpfer

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AU622205B2 (en) 1992-04-02
ZA895961B (en) 1990-04-25
DE3826707A1 (de) 1990-02-08
KR900003514A (ko) 1990-03-26
JPH02191809A (ja) 1990-07-27
DK383389D0 (da) 1989-08-04
BR8903947A (pt) 1990-03-20
ES2045297T3 (es) 1994-01-16
DK383389A (da) 1990-02-06
AU3928889A (en) 1990-02-08
DE58906088D1 (de) 1993-12-09
EP0353761A1 (de) 1990-02-07
US5036585A (en) 1991-08-06
ATE96885T1 (de) 1993-11-15

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