CA1183460A - Exhaust silencer - Google Patents
Exhaust silencerInfo
- Publication number
- CA1183460A CA1183460A CA000413216A CA413216A CA1183460A CA 1183460 A CA1183460 A CA 1183460A CA 000413216 A CA000413216 A CA 000413216A CA 413216 A CA413216 A CA 413216A CA 1183460 A CA1183460 A CA 1183460A
- Authority
- CA
- Canada
- Prior art keywords
- casing
- ceramic element
- wall
- exhaust silencer
- sheet metal
- 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
Links
- 230000003584 silencer Effects 0.000 title claims abstract description 23
- 239000000919 ceramic Substances 0.000 claims abstract description 42
- 229910052751 metal Inorganic materials 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 16
- 238000010276 construction Methods 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims 1
- 238000013016 damping Methods 0.000 description 3
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 description 1
- 229940001007 aluminium phosphate Drugs 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 125000001033 ether group Chemical group 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000002694 phosphate binding agent Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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
- F01N13/1838—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
- F01N1/24—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
- F01N13/16—Selection of particular 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
- F01N2310/00—Selection of sound absorbing or insulating material
- F01N2310/06—Porous ceramics
-
- 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
- F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
- F01N2450/28—Methods or apparatus for fitting, inserting or repairing different elements by using adhesive material, e.g. cement
-
- 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
- F01N2490/00—Structure, disposition or shape of gas-chambers
- F01N2490/08—Two or more expansion chambers in series separated by apertured walls only
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Abstract
ABSTRACT
An exhaust silencer has a sheet-metal outer casing (1).
Abutting the inner cylindrical wall of the casing is the cylindrical outer surface of at least one ceramic element (6). In order to prevent the occurrence of disturbing resonant vibrations in the silencer and in order to provide a rigid structure, the inner wall of the casing (1) is firmly connected to the cylindrical outer surface of the ceramic element (6), for example by shrinking the casing around the ceramic element.
An exhaust silencer has a sheet-metal outer casing (1).
Abutting the inner cylindrical wall of the casing is the cylindrical outer surface of at least one ceramic element (6). In order to prevent the occurrence of disturbing resonant vibrations in the silencer and in order to provide a rigid structure, the inner wall of the casing (1) is firmly connected to the cylindrical outer surface of the ceramic element (6), for example by shrinking the casing around the ceramic element.
Description
The presen-t inven-tion relates to an exha~lst silencer havincJ
good acoustic and mechanical properties, comprisinq a prefer-ably cylindrical casing of sheet metal, end walls of sheet metal connected to the casing and at leas-t one sound-absorbing porous ceramic element with at least one through-going channel for the exhaust gases, wherein the ceramic element arranged in said casing has a cylindrical outer surface lying close to the inner cylindrical wall of the casing and is able to absorb compression strains. The invention also relates to a method of lQ manufacturing such a silencer.
Exhaust silencers containing one or more sound-absorbing porous ceramic elements are described in co-pending Canadian patent application No. 406,~62, owned by the present applicant, filed on June 30, lg82, for an invention entitled "A Silencer".
~e~7~
These silencers have -turned ou-t to be e~tremely e~fective from the view-point of sound absorption compared with conven-tional silencers which are wholly made of sheet me-tal or include sound-damping Eibrous material. Moreover, -the known sound-damping fibrous material is rapidly decomposed and blown out of -the silencer. Then, of course, the sound-damping effect is seriously decreased.
The porous ceramic element, however, is wholly intact.
A common feature of conventional, previously known silencers is that the casing must be made of relatively thick sheet metal, for example 1.5 mm stainless steel sheet, resulting in a rela-tively large mass. A further disadvantage is that the sheet metal casing and possibly also the components located in the casing give rise to resonant vibrations. Therefore, the radiated sound from the outer surface will often get higher than the exhaust sound from the outlet of the silencer.
The present invention relates to a further development of the invention accordlng to aforesaid Canadian patent application No. 406,462, where the excellent mechanical properties of the porous ceramic elements described in said application are used to bring about a new construction of an exhaust silencer, which construction makes it possible to use a much thinner sheet metal for the casing without decreasing the mechanical strength of the silencer. The new construction also results in a total elimina-tion or at least a considerable decrease of the resonant vibra-tions.
Th~s, according to the present invention an exhaust silencer having good acoustic and mechanical properties has been brought about. The silencer comprises a pre-ferably cylindrical casing of sheet metal, end walls of sheet metal connected to the casing and at least one sound-absorbing porous ceramic element wi~h at least one through-going channel for the exhaust gases, wherein the ceramic element arranged in said casing has a cylindrical outer surface lying close to the inner cylindrical ~.vall of the casing and is able to absorb compression strains.
The silencer is characterized in that the casing and the ceramic element to~ether form a rigid sandwich construction where the cylindrical outer surface of the ceramic element is firmly connected with the inner wall of the casing.
The ~irm connection is preferably achieved by means of a shrinkage fit and/or a press fit, but it is also possible to connect the casing and ceramic element by means of an adhesive capable of withstanding heating. Due to the firm connection between the casing and the ceramic element the silencer can be considered as a unitary body or a sandwich construction with a large mass and a large wall thickness. Therefore, the wall thickness of the casing can be reduced. It is not necessary that it is more than 0.3-0.5 mm. Moreover, there is no risk that the silencer will radiate disturbing resonant vibrations.
The greatest stability of the silencer is achieved when the compressing strain constantly acts between the casing and the ceramic element and hence shrinkage and/or press fits are preferred.
The invention will no\~ be described with reference to the accompanying drawin~s, in whioh Figure 1 is a partially cut-a~Yay view of a silencer according to the invention and Figure 2 is a partially, cut-away view of a further silencer according to the invention.
Figure 1 illustrates in perspective a silencer according to the invention and shows a partially cut-a~-av casing 1 macle, preferably, of stainless sheet metal. The casing is of circular-cy~indrical configuration and the thickness of the sheet metal in the illustrated embodiment is about 0.5 mm. To the open ends of the casing 1, walls 2 and 3 are connected from whioh exhaust stubs 4 and 5 extend. The walls are preferably made of a thicker sheet metal and are welded to the casing 1. Inside the casing 1 a ceramic body 6 having a circular-cylindrical outer surface is arranged, which body is preferably ground. The ceramic body 6, which f-orms a sound-absorbing element, is provided with a central through-going channel 7 for the exhaust ~ases. The ceramic element 6 comprises a foamed ceramic material and has been moulded in a m~ould for obtaining a high accuracy to size and, as before mentioned, the cylindrical surface of the element is preferably ground to the desired dimensions, in order to obtain optimum abutment against the inner wall of the casing 1.
The ceramic element, which is highly porous and has a compression strength of at least 40 kN/m2 and preferably at least 400 kN/m2, has an outer diameter which, at room temperature, exceeds the inner diameter of the casing 1. The casing 1 is therefore heated to a temperature, for example 400-600 C, sufficiently high to enable the ceramic element 6 to be pressed into the casing 1, said element being held, for example, at room tempera-tlJre .
The casing 1 is preferably brought -to a temperaturc corresponding to a calculated highest operational temperalure. Ot` course, the casing may be heated to much higher temperatures than those mentioned, when it is desired to obtain ~ery high pressure forces between the inner wall of the casing 1 ancl the ou-ter surface of the ceramic element 6. ~lhen the ceramic element 6 has been placed in a desired position in the heated casing 1, the casing is allowed to cool and thus to shrin~ onto the element 6. The end walls 2 and 3 are then ~elded -firmly to the casing. The resul-tant unit, comprising the casincl 1 anc! the element 6, becomes particularly rigid, which pre\ents -the casing from gene-rating oscillations and, as before mentioned, the casing can also be made very thin. The above mentioned temperature has only been selected by way of example and may var~ in dependence on the co-efficient of expansion of the sheet metal and the ceramic material respectively, or in dependence on the tempera-ture of the ceramic when the element 6 is pressed into the casing 1. The described embodiment where the ceramic elemen-t is pressed into the heated casing, creating a combined shrinkage and press fit, may naturally be replaced with a pure shrinkage fit, in which the casing 1 is heated and caused to expand to an extent such that the ceramic element 6 can be inserted into the casing without requiring an appreciable force to do so, or with a pure press fit, in which the ceramic elemen-t is pressed into the casing without prior heating thereof.
Irrespective of the method used, one important criterion is that there is obtained such a JOint tha-t pressure forces remain between the cylindrical outer surface of the ceramic body 6 and inner wall of the casing 1, even at maximum operational tempera-tures, e.g. operational temperatures of 600 C.
Figure 2 illustrates a sllencer comprising a plurality of ceramic elements, for example elements 8, 9 and 10, all of which are shrinkage-~itted in the metal casing 1.
Each cylindrical element 6, 8, 9 and 10 is ground to an outer diameter which, at low temperatures by which is meant here normal room temperature, i.e. about 20C, exceeds the inner diameter of the casing 1 at the same temperature. In certain cases, the cylindrical elements can be moulded to such precise dimensions as to obviate the need of separately working the outer surfaces of said element.
The shrinkage and/or press fits described above can be replaced with an adhesive joint, where a continuous thin layer of adhesive is applied to the entire outer cylindrical surface of the ceramic element. The element will have a diameter so adapted to the inner diameter of the casing that at least some force is required to press the element into the casing. Any suitable temperature-resistant binding agent can be used, such as an aluminium phosphate binder, for example.
The invention is not limited to the embodiments shown, since these can be modified in different ways within the scope of the present invention. Thus, it is not necessary to have a cylin-drical casing, since a casing with another geometrical shape can also be used. Of course, the outer surface of the ceramic element must always have the same shape as the inner wall of the casing.
A
good acoustic and mechanical properties, comprisinq a prefer-ably cylindrical casing of sheet metal, end walls of sheet metal connected to the casing and at leas-t one sound-absorbing porous ceramic element with at least one through-going channel for the exhaust gases, wherein the ceramic element arranged in said casing has a cylindrical outer surface lying close to the inner cylindrical wall of the casing and is able to absorb compression strains. The invention also relates to a method of lQ manufacturing such a silencer.
Exhaust silencers containing one or more sound-absorbing porous ceramic elements are described in co-pending Canadian patent application No. 406,~62, owned by the present applicant, filed on June 30, lg82, for an invention entitled "A Silencer".
~e~7~
These silencers have -turned ou-t to be e~tremely e~fective from the view-point of sound absorption compared with conven-tional silencers which are wholly made of sheet me-tal or include sound-damping Eibrous material. Moreover, -the known sound-damping fibrous material is rapidly decomposed and blown out of -the silencer. Then, of course, the sound-damping effect is seriously decreased.
The porous ceramic element, however, is wholly intact.
A common feature of conventional, previously known silencers is that the casing must be made of relatively thick sheet metal, for example 1.5 mm stainless steel sheet, resulting in a rela-tively large mass. A further disadvantage is that the sheet metal casing and possibly also the components located in the casing give rise to resonant vibrations. Therefore, the radiated sound from the outer surface will often get higher than the exhaust sound from the outlet of the silencer.
The present invention relates to a further development of the invention accordlng to aforesaid Canadian patent application No. 406,462, where the excellent mechanical properties of the porous ceramic elements described in said application are used to bring about a new construction of an exhaust silencer, which construction makes it possible to use a much thinner sheet metal for the casing without decreasing the mechanical strength of the silencer. The new construction also results in a total elimina-tion or at least a considerable decrease of the resonant vibra-tions.
Th~s, according to the present invention an exhaust silencer having good acoustic and mechanical properties has been brought about. The silencer comprises a pre-ferably cylindrical casing of sheet metal, end walls of sheet metal connected to the casing and at least one sound-absorbing porous ceramic element wi~h at least one through-going channel for the exhaust gases, wherein the ceramic element arranged in said casing has a cylindrical outer surface lying close to the inner cylindrical ~.vall of the casing and is able to absorb compression strains.
The silencer is characterized in that the casing and the ceramic element to~ether form a rigid sandwich construction where the cylindrical outer surface of the ceramic element is firmly connected with the inner wall of the casing.
The ~irm connection is preferably achieved by means of a shrinkage fit and/or a press fit, but it is also possible to connect the casing and ceramic element by means of an adhesive capable of withstanding heating. Due to the firm connection between the casing and the ceramic element the silencer can be considered as a unitary body or a sandwich construction with a large mass and a large wall thickness. Therefore, the wall thickness of the casing can be reduced. It is not necessary that it is more than 0.3-0.5 mm. Moreover, there is no risk that the silencer will radiate disturbing resonant vibrations.
The greatest stability of the silencer is achieved when the compressing strain constantly acts between the casing and the ceramic element and hence shrinkage and/or press fits are preferred.
The invention will no\~ be described with reference to the accompanying drawin~s, in whioh Figure 1 is a partially cut-a~Yay view of a silencer according to the invention and Figure 2 is a partially, cut-away view of a further silencer according to the invention.
Figure 1 illustrates in perspective a silencer according to the invention and shows a partially cut-a~-av casing 1 macle, preferably, of stainless sheet metal. The casing is of circular-cy~indrical configuration and the thickness of the sheet metal in the illustrated embodiment is about 0.5 mm. To the open ends of the casing 1, walls 2 and 3 are connected from whioh exhaust stubs 4 and 5 extend. The walls are preferably made of a thicker sheet metal and are welded to the casing 1. Inside the casing 1 a ceramic body 6 having a circular-cylindrical outer surface is arranged, which body is preferably ground. The ceramic body 6, which f-orms a sound-absorbing element, is provided with a central through-going channel 7 for the exhaust ~ases. The ceramic element 6 comprises a foamed ceramic material and has been moulded in a m~ould for obtaining a high accuracy to size and, as before mentioned, the cylindrical surface of the element is preferably ground to the desired dimensions, in order to obtain optimum abutment against the inner wall of the casing 1.
The ceramic element, which is highly porous and has a compression strength of at least 40 kN/m2 and preferably at least 400 kN/m2, has an outer diameter which, at room temperature, exceeds the inner diameter of the casing 1. The casing 1 is therefore heated to a temperature, for example 400-600 C, sufficiently high to enable the ceramic element 6 to be pressed into the casing 1, said element being held, for example, at room tempera-tlJre .
The casing 1 is preferably brought -to a temperaturc corresponding to a calculated highest operational temperalure. Ot` course, the casing may be heated to much higher temperatures than those mentioned, when it is desired to obtain ~ery high pressure forces between the inner wall of the casing 1 ancl the ou-ter surface of the ceramic element 6. ~lhen the ceramic element 6 has been placed in a desired position in the heated casing 1, the casing is allowed to cool and thus to shrin~ onto the element 6. The end walls 2 and 3 are then ~elded -firmly to the casing. The resul-tant unit, comprising the casincl 1 anc! the element 6, becomes particularly rigid, which pre\ents -the casing from gene-rating oscillations and, as before mentioned, the casing can also be made very thin. The above mentioned temperature has only been selected by way of example and may var~ in dependence on the co-efficient of expansion of the sheet metal and the ceramic material respectively, or in dependence on the tempera-ture of the ceramic when the element 6 is pressed into the casing 1. The described embodiment where the ceramic elemen-t is pressed into the heated casing, creating a combined shrinkage and press fit, may naturally be replaced with a pure shrinkage fit, in which the casing 1 is heated and caused to expand to an extent such that the ceramic element 6 can be inserted into the casing without requiring an appreciable force to do so, or with a pure press fit, in which the ceramic elemen-t is pressed into the casing without prior heating thereof.
Irrespective of the method used, one important criterion is that there is obtained such a JOint tha-t pressure forces remain between the cylindrical outer surface of the ceramic body 6 and inner wall of the casing 1, even at maximum operational tempera-tures, e.g. operational temperatures of 600 C.
Figure 2 illustrates a sllencer comprising a plurality of ceramic elements, for example elements 8, 9 and 10, all of which are shrinkage-~itted in the metal casing 1.
Each cylindrical element 6, 8, 9 and 10 is ground to an outer diameter which, at low temperatures by which is meant here normal room temperature, i.e. about 20C, exceeds the inner diameter of the casing 1 at the same temperature. In certain cases, the cylindrical elements can be moulded to such precise dimensions as to obviate the need of separately working the outer surfaces of said element.
The shrinkage and/or press fits described above can be replaced with an adhesive joint, where a continuous thin layer of adhesive is applied to the entire outer cylindrical surface of the ceramic element. The element will have a diameter so adapted to the inner diameter of the casing that at least some force is required to press the element into the casing. Any suitable temperature-resistant binding agent can be used, such as an aluminium phosphate binder, for example.
The invention is not limited to the embodiments shown, since these can be modified in different ways within the scope of the present invention. Thus, it is not necessary to have a cylin-drical casing, since a casing with another geometrical shape can also be used. Of course, the outer surface of the ceramic element must always have the same shape as the inner wall of the casing.
A
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An exhaust silencer having good acoustic and mechanical properties, comprising a casing of sheet metal, end walls of sheet metal connected to the casing and at least one sound-absorbing porous ceramic element with at least one through-going channel for exhaust gases, the outer surface of the ceramic element having the same shape as the inner wall of the casing, wherein the ceramic element is disposed in said casing and has an outer surface lying close to the inner wall of the casing and is adapted to absorb compression strains, character-ized in that the casing and the ceramic element together form a rigid sandwich construction wherein the outer surface of the ceramic element is firmly connected with the inner wall of the casing, said casing being shrunk and/or pressed on the ceramic element.
2. An exhaust silencer according to claim 1, characterized in that the casing is connected with the ceramic element by means of an adhesive forming a continuous layer between the ceramic element and the inner wall of the casing.
3. An exhaust silencer according to claim 1 or claim 2 wherein the outer surface of the ceramic element and the inner and outer surfaces of the casing are cylindrical in configura-tion.
4. A method of manufacturing an exhaust silencer according to claim 1, which comprises providing at least one porous ceramic element with an outer surface having a diameter which at a first low temperature exceeds the diameter of the inner wall of a casing of sheet metal, the outer surface of the ceramic element having the same shape as the inner wall of the casing, heating the casing to such a high temperature that it is expanded and then inserting the element into the casing, where-by the element is firmly shrunk in the casing when the tempera-ture of the casing is decreased to the first low temperature again.
5. A method according to claim 4, which comprises pressing the element into the heated casing.
6. A method according to claim 4 or claim 5 wherein the outer surface of the ceramic element and the inner and outer surfaces of the casing are cylindrical in configuration.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8106062 | 1981-10-13 | ||
| SE8106062-6 | 1981-10-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1183460A true CA1183460A (en) | 1985-03-05 |
Family
ID=20344780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000413216A Expired CA1183460A (en) | 1981-10-13 | 1982-10-12 | Exhaust silencer |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5879614A (en) |
| BR (1) | BR8205958A (en) |
| CA (1) | CA1183460A (en) |
| DE (1) | DE3238010A1 (en) |
| ES (1) | ES516419A0 (en) |
| FR (1) | FR2514414A1 (en) |
| GB (1) | GB2108200B (en) |
| IT (1) | IT1153227B (en) |
| SE (1) | SE8205687L (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK546483A (en) * | 1983-07-13 | 1985-01-14 | Baekgaard Trading Aps Mogens | NOISE FOR COMBUSTION ENGINES AND PROCEDURES FOR MANUFACTURING THEREOF |
| JPS62175217U (en) * | 1986-04-25 | 1987-11-07 | ||
| CA2102586A1 (en) * | 1992-11-13 | 1994-05-14 | L. Dean Cassell | Golf cart |
| DE19756468C1 (en) * | 1997-12-18 | 1999-03-04 | Alois Ridder Gmbh & Co Kg | Eddy current noise insulator |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2072961A (en) * | 1934-03-01 | 1937-03-09 | Burgess Lab Inc C F | Silencer |
| US3105570A (en) * | 1962-04-17 | 1963-10-01 | Bezemes Nicholas | Internal combustion engine exhaust muffler |
| US3227241A (en) * | 1964-03-16 | 1966-01-04 | Corning Glass Works | Ceramic mufflers |
| US3568723A (en) * | 1967-06-23 | 1971-03-09 | Du Pont | Metal-ceramic composite structures |
-
1982
- 1982-10-06 SE SE8205687A patent/SE8205687L/en not_active Application Discontinuation
- 1982-10-11 ES ES516419A patent/ES516419A0/en active Granted
- 1982-10-12 IT IT23716/82A patent/IT1153227B/en active
- 1982-10-12 CA CA000413216A patent/CA1183460A/en not_active Expired
- 1982-10-12 GB GB08229072A patent/GB2108200B/en not_active Expired
- 1982-10-12 FR FR8217068A patent/FR2514414A1/en active Pending
- 1982-10-12 JP JP57179696A patent/JPS5879614A/en active Pending
- 1982-10-13 DE DE19823238010 patent/DE3238010A1/en not_active Withdrawn
- 1982-10-13 BR BR8205958A patent/BR8205958A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE3238010A1 (en) | 1983-04-21 |
| GB2108200B (en) | 1985-01-16 |
| JPS5879614A (en) | 1983-05-13 |
| BR8205958A (en) | 1983-09-13 |
| ES8400793A1 (en) | 1983-11-01 |
| FR2514414A1 (en) | 1983-04-15 |
| SE8205687L (en) | 1983-04-14 |
| ES516419A0 (en) | 1983-11-01 |
| IT1153227B (en) | 1987-01-14 |
| GB2108200A (en) | 1983-05-11 |
| SE8205687D0 (en) | 1982-10-06 |
| IT8223716A0 (en) | 1982-10-12 |
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