US20060081416A1 - Exhaust silencer with acoustic damping mat - Google Patents
Exhaust silencer with acoustic damping mat Download PDFInfo
- Publication number
- US20060081416A1 US20060081416A1 US10/965,512 US96551204A US2006081416A1 US 20060081416 A1 US20060081416 A1 US 20060081416A1 US 96551204 A US96551204 A US 96551204A US 2006081416 A1 US2006081416 A1 US 2006081416A1
- Authority
- US
- United States
- Prior art keywords
- upper shell
- exhaust silencer
- acoustic damping
- damping material
- silencer according
- 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.)
- Abandoned
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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
- F01N13/1888—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
- 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
- F01N2310/00—Selection of sound absorbing or insulating material
- F01N2310/02—Mineral wool, e.g. glass wool, rock wool, asbestos or the like
Definitions
- the subject invention relates to an exhaust silencer that includes acoustic damping material to reduce noise.
- An exhaust silencer includes an upper shell and a lower shell that together define an internal cavity. Baffle holes and extrusions are formed within the internal cavity. Exhaust air flows from an inlet, through the baffle holes and extrusions, and out an outlet. The baffle holes and extrusions define an exhaust flow path and cooperate to reduce noise as exhaust air flows through the exhaust silencer.
- An exhaust silencer includes an upper shell and a lower shell attached to the upper shell to define an internal cavity. Acoustic damping material is compressed against an inner surface of the upper shell to reduce radiated and transmitted noise. The acoustic damping material is only located in the upper shell and thus is not affected by condensate that collects within the lower shell during vehicle operation.
- the exhaust silencer includes at least one retention member that provides and maintains a compression force against the acoustic damping material.
- the at least one retention member includes a plurality of straps. Each of the plurality of straps has a center portion that extends between first and second strap ends. The center portion engages and compresses the acoustic damping material against the upper shell, with the first and second strap ends directly mounted to the upper shell.
- Locating the acoustic damping material only in the upper shell keeps the acoustic damping material dry and avoids placing the acoustic damping material in an exhaust flow path through the exhaust silencer. Also, shell resonance for both the upper and lower shells is improved.
- FIG. 1 is an assembled perspective view of an exhaust silencer incorporating the subject invention.
- FIG. 2 is side cross-sectional view of the exhaust silencer of FIG. 1 .
- FIG. 3 is an end cross-sectional view of the exhaust silencer of FIG. 2 .
- FIG. 4 is a perspective view of one example of a side retention member.
- FIG. 5 is a perspective view of one example of a bottom retention member.
- An exhaust silencer 10 is shown in FIG. 1 and includes in inlet 12 and an outlet 14 .
- the inlet 12 is in communication with an upstream exhaust system component and the outlet 14 is in communication with a downstream exhaust system component as known.
- the exhaust silencer 10 includes an upper shell 16 that is attached to a lower shell 18 to define an internal cavity 20 , see FIG. 2 .
- Baffle holes and extrusions are located within the internal cavity 20 as known, but are not shown for reasons of clarity. Exhaust air flows along a flow path extending from the inlet 12 , through the baffle holes and extrusions, and out the outlet 14 .
- Acoustic damping material 22 is pressed against an inner surface 24 of the upper shell 16 .
- the acoustic damping material 22 reduces transmitted noise generated by exhaust flow and reduces radiated noise generated by resonance of the upper 16 and lower 18 shells.
- the acoustic damping material 22 is formed as a mat 26 that covers a first portion 30 of the inner surface 24 of the upper shell 16 .
- a second portion 32 of the inner surface 24 of the upper shell 16 remains uncovered, i.e. the second portion 32 is not covered by acoustic damping material 22 .
- the amount of coverage of the first portion 30 relative to the second portion 32 can vary depending upon vehicle application, size, and/or other known specifications.
- a smaller mat portion when maintained in compression against the upper shell 16 , can act as a mute for both the upper 16 and lower 18 shell.
- a larger mat portion additionally increases attenuation of high frequency aural content by diffusing, absorbing, and scattering short-length sound waves.
- the mat 26 is only located within the upper shell 16 .
- the acoustic damping material 22 is kept dry. This allows condensate, which typically collects in the lower shell 18 to be properly drained from the lower shell. Further, by pressing the mat 26 against the inner surface 24 of the upper shell 16 , the acoustic damping material 22 is not located in the flow path of the exhaust air.
- At least one retention member 40 is used to provide and maintain a compression force against the mat 26 .
- the at least one retention member 40 comprises a plurality of retention members 40 .
- each retention member 40 is a strap having a center portion 42 that extends between first 44 and second 46 strap ends.
- the center portion 42 compresses the mat 26 against the inner surface 24 of the upper shell 16 .
- the first 44 and second 46 strap ends extend beyond the mat 26 and are directly attached to the upper shell 16 .
- the first 44 and second 46 strap ends are preferably puddle welded to the upper shell 16 , however, other attachment methods could also be used.
- the upper shell 16 includes an upper wall 50 and a pair of vertical side walls 52 extending from opposing edges of the upper wall 50 .
- the plurality of retention members 40 includes a first strap 54 fixed to one of the pair of vertical side walls 52 and a second strap 56 fixed to another of the pair of vertical side walls 52 .
- a third strap 58 is fixed to the upper wall 50 adjacent one of the opposing edges and a fourth strap 60 is fixed to the upper wall 50 adjacent another of the opposing edges.
- the first 54 , second 56 , third 58 , and fourth 60 straps cooperate to securely hold and maintain the mat 26 in compression against the upper shell 16 .
- FIG. 4 shows one example of a strap configuration that could be used for either the first 54 or second 56 strap.
- This strap configuration provides a strap body 62 with transversely extending first 64 and second 66 strap ends.
- the strap body 62 includes rib portions 68 that generally correspond in shape to ribs 70 formed on the upper shell 16 (see FIG. 1 ).
- the mat 26 is compressed between one vertical side wall 52 and the strap body 62 and the first 64 and second 66 strap ends are attached to the upper shell 16 as described above.
- FIG. 5 shows one example of a strap configuration that could be used for either the third 58 or fourth 60 strap.
- This strap configuration provides a strap body 72 with transversely extending first 74 and second 76 strap ends.
- the strap body 72 is curved to match a curved profile 78 of the upper shell 16 (see FIG. 1 ).
- the strap body 72 includes rib portions 80 that generally correspond in shape to the ribs 70 on the upper shell 16 .
- the mat 26 is compressed between the upper wall 50 and the strap body 72 and the first 74 and second 76 strap ends are attached to the upper shell 16 as described above.
- any type of acoustic damping material 22 known in the art can be used to form the mat 26 .
- an E-glass silentex powertex material manufactured by BGF Industries is used to form the mat, however, other fiberglass materials, or other materials, could also be used.
- the upper 16 and lower 18 shells, and the straps shown in FIGS. 4 and 5 are preferably made from 409 stainless steel, however, other known materials could also be used.
- straps are just one example of a retention member that could be used to compress the mat 26 against the upper shell 16 .
- Bands, baffles, netting or an inner shell portion could also be used to hold the mat 26 in place.
- the subject invention provides an exhaust silencer 10 with improved acoustic damping. Locating the acoustic damping material 22 only in the upper shell 16 keeps the acoustic damping material 22 dry and avoids placing the acoustic damping material 22 in an exhaust flow path through the exhaust silencer 10 . Also, shell resonance for both the upper 16 and lower 18 shells is improved.
Abstract
Description
- The subject invention relates to an exhaust silencer that includes acoustic damping material to reduce noise.
- An exhaust silencer includes an upper shell and a lower shell that together define an internal cavity. Baffle holes and extrusions are formed within the internal cavity. Exhaust air flows from an inlet, through the baffle holes and extrusions, and out an outlet. The baffle holes and extrusions define an exhaust flow path and cooperate to reduce noise as exhaust air flows through the exhaust silencer.
- Some disadvantages with this traditional exhaust silencer configuration are mid-frequency noise attenuation capability and shell resonance noise. One solution that has been used to address these noise issues has been to provide an exhaust silencer that is loosely filled with acoustic damping material. This solution has provided unsatisfactory results. In this configuration, loose fill falls into the exhaust flow path, which can increase back-pressure. Further, the loose fill settles into the lower shell where condensate typically collects. Thus, the loose fill soaks up the condensate, which can degrade the loose fill and also can prevent the condensate from draining out of the lower shell as needed.
- Thus, there is a need for an exhaust silencer that can reduce radiated as well as transmitted noise without increasing back pressure and adversely affecting operation of the exhaust silencer.
- An exhaust silencer includes an upper shell and a lower shell attached to the upper shell to define an internal cavity. Acoustic damping material is compressed against an inner surface of the upper shell to reduce radiated and transmitted noise. The acoustic damping material is only located in the upper shell and thus is not affected by condensate that collects within the lower shell during vehicle operation.
- The exhaust silencer includes at least one retention member that provides and maintains a compression force against the acoustic damping material. In one example, the at least one retention member includes a plurality of straps. Each of the plurality of straps has a center portion that extends between first and second strap ends. The center portion engages and compresses the acoustic damping material against the upper shell, with the first and second strap ends directly mounted to the upper shell.
- Locating the acoustic damping material only in the upper shell keeps the acoustic damping material dry and avoids placing the acoustic damping material in an exhaust flow path through the exhaust silencer. Also, shell resonance for both the upper and lower shells is improved. These and other features of the present invention can be best understood from the following specification and drawings, the following of which is a brief description.
-
FIG. 1 is an assembled perspective view of an exhaust silencer incorporating the subject invention. -
FIG. 2 is side cross-sectional view of the exhaust silencer ofFIG. 1 . -
FIG. 3 is an end cross-sectional view of the exhaust silencer ofFIG. 2 . -
FIG. 4 is a perspective view of one example of a side retention member. -
FIG. 5 is a perspective view of one example of a bottom retention member. - An
exhaust silencer 10 is shown inFIG. 1 and includes ininlet 12 and anoutlet 14. Theinlet 12 is in communication with an upstream exhaust system component and theoutlet 14 is in communication with a downstream exhaust system component as known. - The
exhaust silencer 10 includes anupper shell 16 that is attached to alower shell 18 to define aninternal cavity 20, seeFIG. 2 . Baffle holes and extrusions are located within theinternal cavity 20 as known, but are not shown for reasons of clarity. Exhaust air flows along a flow path extending from theinlet 12, through the baffle holes and extrusions, and out theoutlet 14. -
Acoustic damping material 22 is pressed against aninner surface 24 of theupper shell 16. Theacoustic damping material 22 reduces transmitted noise generated by exhaust flow and reduces radiated noise generated by resonance of the upper 16 and lower 18 shells. - In the example shown in
FIG. 2 , theacoustic damping material 22 is formed as amat 26 that covers afirst portion 30 of theinner surface 24 of theupper shell 16. Asecond portion 32 of theinner surface 24 of theupper shell 16 remains uncovered, i.e. thesecond portion 32 is not covered byacoustic damping material 22. The amount of coverage of thefirst portion 30 relative to thesecond portion 32 can vary depending upon vehicle application, size, and/or other known specifications. A smaller mat portion, when maintained in compression against theupper shell 16, can act as a mute for both the upper 16 and lower 18 shell. A larger mat portion additionally increases attenuation of high frequency aural content by diffusing, absorbing, and scattering short-length sound waves. - The
mat 26 is only located within theupper shell 16. By physically locating themat 26 only in theupper shell 16, theacoustic damping material 22 is kept dry. This allows condensate, which typically collects in thelower shell 18 to be properly drained from the lower shell. Further, by pressing themat 26 against theinner surface 24 of theupper shell 16, theacoustic damping material 22 is not located in the flow path of the exhaust air. - At least one
retention member 40 is used to provide and maintain a compression force against themat 26. In one example, shown inFIGS. 2 and 3 , the at least oneretention member 40 comprises a plurality ofretention members 40. In the example shown, eachretention member 40 is a strap having acenter portion 42 that extends between first 44 and second 46 strap ends. Thecenter portion 42 compresses themat 26 against theinner surface 24 of theupper shell 16. The first 44 and second 46 strap ends extend beyond themat 26 and are directly attached to theupper shell 16. The first 44 and second 46 strap ends are preferably puddle welded to theupper shell 16, however, other attachment methods could also be used. - As shown in
FIG. 3 , theupper shell 16 includes anupper wall 50 and a pair ofvertical side walls 52 extending from opposing edges of theupper wall 50. In one configuration, the plurality ofretention members 40 includes afirst strap 54 fixed to one of the pair ofvertical side walls 52 and asecond strap 56 fixed to another of the pair ofvertical side walls 52. Athird strap 58 is fixed to theupper wall 50 adjacent one of the opposing edges and afourth strap 60 is fixed to theupper wall 50 adjacent another of the opposing edges. The first 54,second 56, third 58, and fourth 60 straps cooperate to securely hold and maintain themat 26 in compression against theupper shell 16. -
FIG. 4 shows one example of a strap configuration that could be used for either the first 54 or second 56 strap. This strap configuration provides astrap body 62 with transversely extending first 64 and second 66 strap ends. Thestrap body 62 includesrib portions 68 that generally correspond in shape toribs 70 formed on the upper shell 16 (seeFIG. 1 ). Themat 26 is compressed between onevertical side wall 52 and thestrap body 62 and the first 64 and second 66 strap ends are attached to theupper shell 16 as described above. -
FIG. 5 shows one example of a strap configuration that could be used for either the third 58 or fourth 60 strap. This strap configuration provides astrap body 72 with transversely extending first 74 and second 76 strap ends. Thestrap body 72 is curved to match acurved profile 78 of the upper shell 16 (seeFIG. 1 ). Thestrap body 72 includesrib portions 80 that generally correspond in shape to theribs 70 on theupper shell 16. Themat 26 is compressed between theupper wall 50 and thestrap body 72 and the first 74 and second 76 strap ends are attached to theupper shell 16 as described above. - Any type of acoustic damping
material 22 known in the art can be used to form themat 26. In one example, an E-glass silentex powertex material manufactured by BGF Industries is used to form the mat, however, other fiberglass materials, or other materials, could also be used. Additionally, the upper 16 and lower 18 shells, and the straps shown inFIGS. 4 and 5 are preferably made from 409 stainless steel, however, other known materials could also be used. - It should be understood that straps are just one example of a retention member that could be used to compress the
mat 26 against theupper shell 16. Bands, baffles, netting or an inner shell portion could also be used to hold themat 26 in place. - As discussed above, the subject invention provides an
exhaust silencer 10 with improved acoustic damping. Locating the acoustic dampingmaterial 22 only in theupper shell 16 keeps the acoustic dampingmaterial 22 dry and avoids placing the acoustic dampingmaterial 22 in an exhaust flow path through theexhaust silencer 10. Also, shell resonance for both the upper 16 and lower 18 shells is improved. - Although a preferred embodiment of this invention has been disclosed, a worker of ordinary skill in this art would recognize that certain modifications would come within the scope of this invention. For that reason, the following claims should be studied to determine the true scope and content of this invention.
Claims (18)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/965,512 US20060081416A1 (en) | 2004-10-14 | 2004-10-14 | Exhaust silencer with acoustic damping mat |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US10/965,512 US20060081416A1 (en) | 2004-10-14 | 2004-10-14 | Exhaust silencer with acoustic damping mat |
Publications (1)
Publication Number | Publication Date |
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US20060081416A1 true US20060081416A1 (en) | 2006-04-20 |
Family
ID=36179546
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/965,512 Abandoned US20060081416A1 (en) | 2004-10-14 | 2004-10-14 | Exhaust silencer with acoustic damping mat |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080190689A1 (en) * | 2007-02-12 | 2008-08-14 | Ballard Ebbin C | Inserts for engine exhaust systems |
US20150008068A1 (en) * | 2013-07-03 | 2015-01-08 | Honda Motor Co., Ltd. | Automotive muffler |
US20160061074A1 (en) * | 2014-08-27 | 2016-03-03 | Eberspächer Exhaust Technology GmbH & Co. KG | Muffler |
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US20050115229A1 (en) * | 2003-11-27 | 2005-06-02 | J. Eberspacher Gmbh & Co. Kg | Muffler with an integrated catalytic converter |
US20060289231A1 (en) * | 2005-06-28 | 2006-12-28 | Priebe Joseph A | Acoustic absorber/barrier composite |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US20080190689A1 (en) * | 2007-02-12 | 2008-08-14 | Ballard Ebbin C | Inserts for engine exhaust systems |
US20150008068A1 (en) * | 2013-07-03 | 2015-01-08 | Honda Motor Co., Ltd. | Automotive muffler |
US9261009B2 (en) * | 2013-07-03 | 2016-02-16 | Honda Motor Co., Ltd. | Automotive muffler |
US20160061074A1 (en) * | 2014-08-27 | 2016-03-03 | Eberspächer Exhaust Technology GmbH & Co. KG | Muffler |
US9546581B2 (en) * | 2014-08-27 | 2017-01-17 | Eberspächer Exhaust Technology GmbH & Co. KG | Muffler for an exhaust system |
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