CA2011071A1 - Exhaust pipe-silencer and a method for manufacturing parts thereof - Google Patents
Exhaust pipe-silencer and a method for manufacturing parts thereofInfo
- Publication number
- CA2011071A1 CA2011071A1 CA 2011071 CA2011071A CA2011071A1 CA 2011071 A1 CA2011071 A1 CA 2011071A1 CA 2011071 CA2011071 CA 2011071 CA 2011071 A CA2011071 A CA 2011071A CA 2011071 A1 CA2011071 A1 CA 2011071A1
- Authority
- CA
- Canada
- Prior art keywords
- silencer
- exhaust pipe
- tube
- helically
- tubes
- 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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- Exhaust Silencers (AREA)
Abstract
EXHAUST PIPE-SILENCER AND A
METHOD FOR MANUFACTURING PARTS THEREOF
ABSTRACT OF THE DISCLOSURE
The invention relates to a method of manufacturing parts for an exhaust pipe-silencer combination. According to the method, the parts are formed of a metal strip by a helical seaming process.
Outer tubes (1, 3, 4) of the silencer, which include a conical portion, are helically seamed beginning from a cylindrical portion having a larger diameter. The substantially conical portion is helically seamed so that the diameter thereof is diminished continuously and smoothly to correspond to the diameter of the parts of the exhaust pipe. Finally, a second cylindrical portion having a smaller diameter is formed. The invention is also related to an exhaust pipe-silencer combination, in particular for motor vehicles, in which both the exhaust pipe-silencer combination, in particular for motor vehicles, in which both the exhaust pipe and an outer tube (2) of the silencer, as well as the outer tubes of the exhaust pipe and the silencer, outer tubes (1, 3, 4) most suitably conically changing in diameter, are of profiled, lock-fold jointed, helically-seamed tubing. The outer mantle of the silencer is partly formed by two separate parts (1, 3) having substantially conical narrowing portions. The tube parts provided with the narrowing portions are connected to each other by the helically-seamed tube (2) having the diameter of the mantle of the silencer, utilizing the screw-threads of the profiling of the different parts.
METHOD FOR MANUFACTURING PARTS THEREOF
ABSTRACT OF THE DISCLOSURE
The invention relates to a method of manufacturing parts for an exhaust pipe-silencer combination. According to the method, the parts are formed of a metal strip by a helical seaming process.
Outer tubes (1, 3, 4) of the silencer, which include a conical portion, are helically seamed beginning from a cylindrical portion having a larger diameter. The substantially conical portion is helically seamed so that the diameter thereof is diminished continuously and smoothly to correspond to the diameter of the parts of the exhaust pipe. Finally, a second cylindrical portion having a smaller diameter is formed. The invention is also related to an exhaust pipe-silencer combination, in particular for motor vehicles, in which both the exhaust pipe-silencer combination, in particular for motor vehicles, in which both the exhaust pipe and an outer tube (2) of the silencer, as well as the outer tubes of the exhaust pipe and the silencer, outer tubes (1, 3, 4) most suitably conically changing in diameter, are of profiled, lock-fold jointed, helically-seamed tubing. The outer mantle of the silencer is partly formed by two separate parts (1, 3) having substantially conical narrowing portions. The tube parts provided with the narrowing portions are connected to each other by the helically-seamed tube (2) having the diameter of the mantle of the silencer, utilizing the screw-threads of the profiling of the different parts.
Description
- 2~ l ' a7 3 ,.
., l~ 8T PIPB--~;II~NC~ AND A
1 ~IET~lOD FOR Nl~NlJFACTllRING PARTS T~E:OF
BACRGROllND OF 1~ INV~NTION
' The invention relates to a m~thod for manufacturing parts for an exhaust pipe-silencer combination, according to which method the parts are formed of a metal strip by a helical seaming process.
~ The invention also relates to an exhaust pipe-silencer ;~ combination, in particular for motor vehicles, which combination is made of a metal strip by a helical seaming process, in which both the ¦ exhaust pipe and an outer tube of the silencer or muffler having a diameter larger than the diameter of the exhaust pipe, as well as having a larger diameter than the outer tubes of the exhaust pipe and the silencer, the outer tubes most suitably conically changing in diameter, are of profiled, lock-fold jointed, helically-seamed tubing, in which the outer mantle of the silencer is partly formed of two separate parts having substantially conical narrowing portions, and which tube parts provided with the narrowing portions are ~j connected to each other by a helically-seamed tube having the diameter of the silencer mantle, utilizing the screw-threads of the ~-~ profiling of the different parts.
The combination of exhaust pipe and silencer according to the invention is intended for exhaust systems comprising exhaust pipes with silencers and tail pipes.
Exhaust systems comprising exhaust pipes and silencers have previously most commonly been made of steel tubing by welding various . parts together. The outer part of the silencer or muffler has usually been made of a constant diameter tube, to the ends of which planar end flanges have been attached by welding. Consequently, a ~` large number of different work stages are required in the manufacturing of an exhaust system with an exhaust pipe and .; ., ,, --1--.~
2 ~ 7 1 silencer. The use of welded joints has restricted the use of materials more resistant to corrosion in exhaust pipes and silencers, because welded joints without expensive protective treatment constitute points highly susceptible to corrosion, and thus partly 7 for this reason it has been uneconomic to use better materials offering good corrosion-resistance, such as, acid-resistant steel.
Accordingly, some of the weakest parts of motor vehicles in i resistance to corrosion have been the exhaust pipe and the silencer,¦ and they have to be replaced either partly or totally several times during the service life of a vehicle.
It is previously known to make a certain part of an engine exhaust pipe, more specifically a short section extending from the exhaust manifold of the engine to a conventional exhaust pipe with a ¦ silencer, of hose-like, completely flexible metal tubing resembling helically-seamed tubing. The flexibility of such tubing is based on a yielding, moving seam, and not on the profiling. An entire exhaust pipe with a silencer has not been manufactured from such tubes, nor have they comprised any helically-seamed portions changing, e.g. -conically, in diameter.
' A further previously-known construction of an exhaust ¦ pipe-silencer combination is disclosed in FI Patent 52761. In this prior art structure the exhaust pipe and the outer tube of the silencer as well as their connection parts are of profiled, lock-fold jointed, helically-seamed tubing, and the different parts of the I combination have been attached to each other by means of the ~1-screw-threads provided by the profiling.
SUMNARY OF T~ INVENTION
An object of the invention is to help to eliminate the drawbacks indicated above, and to provide an exhaust system ' .~
2 ~
comprising an exhaust pipe with a silencer in the manufacture of which no welded joints need to be used, which contributes to making it economical to use materials which are better than those heretofore used from the point of view of corrosion, such as, for example, acid-resistant steels, in exhaust systems with exhaust pipes and silencers. A further object of the invention is to provide a method of manufacturing the parts for the exhaust pipe-silencer combination by helically seaming suitably profiled tubing of a material web in such a manner that the different parts constitute a system in which a suitable exhaust pipe-silencer combination is achieved by combining parts of the system, for instance, for different types of motor vehicle. In accordance with the invention, the exhaust system comprising the exhaust pipe and the silencer is made of helically-seamed, suitably profiled tubing manufactured by machine from a strip by cold rolling for example.
When the tubing helically-seamed in accordance with the invention is profiled as to be bendable, the pipes of the exhaust system can be bent into desired shape without any moulds or other tools, and there exists no risk of buckling. When an exhaust system of exhaust pipe and silencer is assembled from parts, the parts can be profiled so that the profile serves as a screw-thread by means of which the different parts of the entire exhaust system with an exhaust pipe and silencer can be joined together by screwing the parts more or less deeply one into another. In this manner a wide range of possibilities to adjust the lengths of exhaust pipes and silencers is also achieved. The profiling also increases the cooling surface and the breaking of sound waves in the exhaust system of exhaust pipe and silencer, which as a result of the profiling can be more uniformly distributed over the entire exhaust system. The .~ .
. ~
., l~ 8T PIPB--~;II~NC~ AND A
1 ~IET~lOD FOR Nl~NlJFACTllRING PARTS T~E:OF
BACRGROllND OF 1~ INV~NTION
' The invention relates to a m~thod for manufacturing parts for an exhaust pipe-silencer combination, according to which method the parts are formed of a metal strip by a helical seaming process.
~ The invention also relates to an exhaust pipe-silencer ;~ combination, in particular for motor vehicles, which combination is made of a metal strip by a helical seaming process, in which both the ¦ exhaust pipe and an outer tube of the silencer or muffler having a diameter larger than the diameter of the exhaust pipe, as well as having a larger diameter than the outer tubes of the exhaust pipe and the silencer, the outer tubes most suitably conically changing in diameter, are of profiled, lock-fold jointed, helically-seamed tubing, in which the outer mantle of the silencer is partly formed of two separate parts having substantially conical narrowing portions, and which tube parts provided with the narrowing portions are ~j connected to each other by a helically-seamed tube having the diameter of the silencer mantle, utilizing the screw-threads of the ~-~ profiling of the different parts.
The combination of exhaust pipe and silencer according to the invention is intended for exhaust systems comprising exhaust pipes with silencers and tail pipes.
Exhaust systems comprising exhaust pipes and silencers have previously most commonly been made of steel tubing by welding various . parts together. The outer part of the silencer or muffler has usually been made of a constant diameter tube, to the ends of which planar end flanges have been attached by welding. Consequently, a ~` large number of different work stages are required in the manufacturing of an exhaust system with an exhaust pipe and .; ., ,, --1--.~
2 ~ 7 1 silencer. The use of welded joints has restricted the use of materials more resistant to corrosion in exhaust pipes and silencers, because welded joints without expensive protective treatment constitute points highly susceptible to corrosion, and thus partly 7 for this reason it has been uneconomic to use better materials offering good corrosion-resistance, such as, acid-resistant steel.
Accordingly, some of the weakest parts of motor vehicles in i resistance to corrosion have been the exhaust pipe and the silencer,¦ and they have to be replaced either partly or totally several times during the service life of a vehicle.
It is previously known to make a certain part of an engine exhaust pipe, more specifically a short section extending from the exhaust manifold of the engine to a conventional exhaust pipe with a ¦ silencer, of hose-like, completely flexible metal tubing resembling helically-seamed tubing. The flexibility of such tubing is based on a yielding, moving seam, and not on the profiling. An entire exhaust pipe with a silencer has not been manufactured from such tubes, nor have they comprised any helically-seamed portions changing, e.g. -conically, in diameter.
' A further previously-known construction of an exhaust ¦ pipe-silencer combination is disclosed in FI Patent 52761. In this prior art structure the exhaust pipe and the outer tube of the silencer as well as their connection parts are of profiled, lock-fold jointed, helically-seamed tubing, and the different parts of the I combination have been attached to each other by means of the ~1-screw-threads provided by the profiling.
SUMNARY OF T~ INVENTION
An object of the invention is to help to eliminate the drawbacks indicated above, and to provide an exhaust system ' .~
2 ~
comprising an exhaust pipe with a silencer in the manufacture of which no welded joints need to be used, which contributes to making it economical to use materials which are better than those heretofore used from the point of view of corrosion, such as, for example, acid-resistant steels, in exhaust systems with exhaust pipes and silencers. A further object of the invention is to provide a method of manufacturing the parts for the exhaust pipe-silencer combination by helically seaming suitably profiled tubing of a material web in such a manner that the different parts constitute a system in which a suitable exhaust pipe-silencer combination is achieved by combining parts of the system, for instance, for different types of motor vehicle. In accordance with the invention, the exhaust system comprising the exhaust pipe and the silencer is made of helically-seamed, suitably profiled tubing manufactured by machine from a strip by cold rolling for example.
When the tubing helically-seamed in accordance with the invention is profiled as to be bendable, the pipes of the exhaust system can be bent into desired shape without any moulds or other tools, and there exists no risk of buckling. When an exhaust system of exhaust pipe and silencer is assembled from parts, the parts can be profiled so that the profile serves as a screw-thread by means of which the different parts of the entire exhaust system with an exhaust pipe and silencer can be joined together by screwing the parts more or less deeply one into another. In this manner a wide range of possibilities to adjust the lengths of exhaust pipes and silencers is also achieved. The profiling also increases the cooling surface and the breaking of sound waves in the exhaust system of exhaust pipe and silencer, which as a result of the profiling can be more uniformly distributed over the entire exhaust system. The .~ .
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, silencer can thus be constructed so that the flow therein is very easy.
The exhaust pipe-silencer combination according to the invention is mainly characterized in that the inner part of the silencer or muffler is at least double walled, comprising an inner tube, which is composed of a cylindrical part and a conical part, and an outer tube, which are made of lock-fold jointed, profiled, helically-seamed tubing, and that the inner part of the silencer is clamped at its ends to the outer mantle of the silencer by utilizing the screw-threads formed by the profiling.
The method according to the invention is mainly characterized in that the outer tubes of the silencer, which include ;
a conical portion, are helically seamed beginning from a cylindrical portion having a larger diameter, and that the substantially conical portion is helically seamed so that the diameter thereof is diminished continuously and smoothly to correspond to the diameter of the parts of the exhaust pipe, and a second cylindrical part having a -smaller diameter is formed in the end.
The joining of the parts of the helically-seamed exhaust pipe-silencer combination to each other is a simple and fast operation by means of connecting pieces joined to the helically-seamed profiling, or by using the helically-seamed profiling directly as a connection element. Consequently, the use of an exhaust pipe-silencer combination enabling the parts thereof to be joined to each other according to the invention, having a module construction, and assembled from standard parts, makes it possible for spare part suppliers and/or manufacturers to keep smaller stocks, and as a result less capital need be tied up in the stock of parts.
The silencer of the invention, which comprises a straight , .
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L O ', 1 ~i part and a conical part, enables the silencing effect to be doubled.
Moreover, the inner part of the silencer is small as compared with other silencer structures. The inner part is easy to attach to the 3 conical parts of the silencer. It is also possible to attach, for instance, a catalytic converter as an inner part to these conical outer tube parts of the silencer. In the silencer according to the invention one of the conical parts is made of two conical parts disposed one within the other, whereby it serves as a thermal insulation and prevents any damage which shocks or bumps might cause. Further, the silencer according to the invention can be easily shaped, e.g., flattened to obtain a suitable shape, thereby providing larger ground clearance for instance.
BRIBF D~SCRIPTION OF T~E DRa~ING8 I
g The invention is described in more detail with reference to `1 the embodiments shown in the Figures of the accompanying drawings, to which the invention is by no means restricted.
Fig. 1 shows an exhaust pipe-silencer combination according ! to the invention.
i Fig. 2 shows the joining of the silencer to the pipes of an --exhaust system and the structure of the inner part of the silencer.
Fig. 2A and B show in end view the inner part of the `j silencer.
Fig. 3 shows the seam structure of helically-seamed tubing.
Fig. 4A, and B and C show possibilities of joining parts of an exhaust pipe-silencer combination to each other according to the invention.
PREFERRED ~MBODI~FNT8 OF ~9E INV~NTION
The exhaust pipe-silencer combination, as shown in Fig. 1, consists of several separate parts, made of helically-seamed tubing, :'~
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and of connection pieces. An outer tube 2 of the silencer or muffler i is cylindrical, and tubes 1 and 3 are joined thereto by means of double threads formed by a helically-seamed profiling. The tube 2 has a diameter slightly smaller than the diameters of the tubes 1 and , 3. The tubes 1 and 3 consist of a short cylindrical portion and a conical portion, which as a narrower tube smoothly connects with exhaust pipes or tubes. According to the invention, the tubes 1 and 3 are formed by a helical seaming process in such a manner that from a material strip is first helically seamed the cylindrical portion, whose diameter is larger than those of the exhaust pipes, or tubes, of the exhaust system, and after that the diameter is diminished so as to form a smooth conical or tapering portion, which ends when its diameter has reached the diameter of a tube part of the exhaust tubes. After that the helical seaming process is continued for a suitable length, maintaining the diameter of the exhaust tube part.
A tube 4, corresponding to the shape of the tube 3 and having a diameter slightly larger than the diameter of the tube 3, is screwed onto the tube 3 utilizing the double threads formed by the profiling of the helical seam. This outer tube 4 strengthens the silencer to prevent any damage which shocks may cause, and at the same time acts as a double thermal insulation together with the tube 3. The tube 1 of the silencer is connected to a tube, or pipe, 5 of the exhaust system by means of connection pieces 6 and 7. The tubes 1 and 5 are helically-seamed tubes, thus having a double-thread profiling. The connection pieces 6 and 7 are provided with double-thread portions by means of which they are attached to the double-thread profiling of the respective tubes 1 and 5. Otherwise the tubes 6 and 7 are smooth tubes. The joining of the parts is illustrated in Figs. 4A, B and C
in greater detail. The tube 3 of the silencer is connected to the , :' .
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exhaust system by a connection piece in a corresponding manner.
Connection pieces can also be used for attaching other parts of the exhaust system to each other. The exhaust system is fixed to a vehicle by conventional attachment means.
As shown in Fig. 2, the inner part of the silencer is formed of an inner tube comprising a conical part 9 and a cylindrical part 11. A trans~erse guide plate lo is disposed at the junction of the tubes 9 and 11, which plate is attached by welding to an outer tube 8 of the inner part of the silencer. The guide plate 10 is provided with vane-like formations ~not shown in the Fig.) giving rise to turbulence of the gases in the inner part of the silencer. The outer tube 8 of the inner part of the silencer is bent at its both ends against the respective part 9 or 11 of the inner tube so as to form at its ends a structure shown in Figs. 2a and 2b. The inner part of the silencer is attached at its ends to the conical portions 1 and 3 of the outer tube. The attachment is accomplished by means of the double threads of the helically-seamed profiling. The outer tube of the inner part of the silencer is provided with perforations to enable the circulation of gases. In addition, the inner tube 9, 11 of the inner part of the silencer is provided with perforations over a short distance close to the transverse guide plate 10, also to improve the circulation of gases.
Fig. 3 shows a suitable seam structure 12 by which adjacent strip turns 13 and 14 are attached to each other. This seam 12 has proven to be absolutely gas-tight.
Fig. 4a shows two helically-seamed tubes 15 and 16 which can be screwed more or less deeply one into the other, utilizing the screw-threads formed by a profiling 18, in which case their diameters "
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, i are, of course, slightly different is size. The tubes 15 and 16 can be screwed one into the other so that their seams 12 will be against each other. The tubes 15 and 16 are illustrated as being provided with an undulating profile of two crests, which may equally well be of another shape and have one or more crests. The profiling has at least four tasks important in view of the invention, part of which have already been indicated above: first, the profiling serves as screw-threads by means of which the different parts of the exhaust pipe as well as the silencer may be attached to each other so that their lengths can be adjusted; secondly, the profiling makes the tubes suitably bendable without any risk of buckling; thirdly, the I profiling increases the cooling surface and the breaking of sound 3 waves, in some cases even to the extent that the inner part of the silencer becomes unnecessary; and fourthly, the profiling and the seaming increase the resilient properties of the exhaust system so ~' that it will not easily fracture.
f Fig. 4b illustrates the joining of the connection piece 6 to the profiled 18 double threads of the helically-seamed tube 16. The ~-' thread portions 17 provided in the connection piece correspond to the ; -, ` double-thread portions 18 of the helically-seamed tube.
, Fig. 4c illustrates the joining of the connection pieces 6`f and 7 to each other with relatively loose fitting. Both of the connection pieces have the thread portions 17 corresponding to the 3 double thread of the helically-seamed profiling.
, The attachment of the parts of the exhaust pipe-silencer combination to each other by means of the connection pieces and/or the double threads of the helically-seamed profiling constitutes a ~, gas-tight joint, thus preventing any leakage of gases therefrom.
The exhaust pipes and silencers according to the invention :-' :
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are very suitable for use as spare parts for different motor vehicles, because from e.g. standard-size parts it is possible to assemble easily exhaust systems of exhaust pipes and silencers of varying lengths, and to bend them into desired shape even without any ~J
tools.
The preceding description of the invention is merely exemplary with reference to the Figures of the drawing. However, it ~; is hereby not desired to restrict the invention only to the examples illustrated in the Figures. Numerous modifications are feasible ¦ within the inventive idea defined in the following claims.
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, silencer can thus be constructed so that the flow therein is very easy.
The exhaust pipe-silencer combination according to the invention is mainly characterized in that the inner part of the silencer or muffler is at least double walled, comprising an inner tube, which is composed of a cylindrical part and a conical part, and an outer tube, which are made of lock-fold jointed, profiled, helically-seamed tubing, and that the inner part of the silencer is clamped at its ends to the outer mantle of the silencer by utilizing the screw-threads formed by the profiling.
The method according to the invention is mainly characterized in that the outer tubes of the silencer, which include ;
a conical portion, are helically seamed beginning from a cylindrical portion having a larger diameter, and that the substantially conical portion is helically seamed so that the diameter thereof is diminished continuously and smoothly to correspond to the diameter of the parts of the exhaust pipe, and a second cylindrical part having a -smaller diameter is formed in the end.
The joining of the parts of the helically-seamed exhaust pipe-silencer combination to each other is a simple and fast operation by means of connecting pieces joined to the helically-seamed profiling, or by using the helically-seamed profiling directly as a connection element. Consequently, the use of an exhaust pipe-silencer combination enabling the parts thereof to be joined to each other according to the invention, having a module construction, and assembled from standard parts, makes it possible for spare part suppliers and/or manufacturers to keep smaller stocks, and as a result less capital need be tied up in the stock of parts.
The silencer of the invention, which comprises a straight , .
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;~ -4 , .
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,.. .
L O ', 1 ~i part and a conical part, enables the silencing effect to be doubled.
Moreover, the inner part of the silencer is small as compared with other silencer structures. The inner part is easy to attach to the 3 conical parts of the silencer. It is also possible to attach, for instance, a catalytic converter as an inner part to these conical outer tube parts of the silencer. In the silencer according to the invention one of the conical parts is made of two conical parts disposed one within the other, whereby it serves as a thermal insulation and prevents any damage which shocks or bumps might cause. Further, the silencer according to the invention can be easily shaped, e.g., flattened to obtain a suitable shape, thereby providing larger ground clearance for instance.
BRIBF D~SCRIPTION OF T~E DRa~ING8 I
g The invention is described in more detail with reference to `1 the embodiments shown in the Figures of the accompanying drawings, to which the invention is by no means restricted.
Fig. 1 shows an exhaust pipe-silencer combination according ! to the invention.
i Fig. 2 shows the joining of the silencer to the pipes of an --exhaust system and the structure of the inner part of the silencer.
Fig. 2A and B show in end view the inner part of the `j silencer.
Fig. 3 shows the seam structure of helically-seamed tubing.
Fig. 4A, and B and C show possibilities of joining parts of an exhaust pipe-silencer combination to each other according to the invention.
PREFERRED ~MBODI~FNT8 OF ~9E INV~NTION
The exhaust pipe-silencer combination, as shown in Fig. 1, consists of several separate parts, made of helically-seamed tubing, :'~
, -5-., 2 ~3 i A ~ 7 :' :!
and of connection pieces. An outer tube 2 of the silencer or muffler i is cylindrical, and tubes 1 and 3 are joined thereto by means of double threads formed by a helically-seamed profiling. The tube 2 has a diameter slightly smaller than the diameters of the tubes 1 and , 3. The tubes 1 and 3 consist of a short cylindrical portion and a conical portion, which as a narrower tube smoothly connects with exhaust pipes or tubes. According to the invention, the tubes 1 and 3 are formed by a helical seaming process in such a manner that from a material strip is first helically seamed the cylindrical portion, whose diameter is larger than those of the exhaust pipes, or tubes, of the exhaust system, and after that the diameter is diminished so as to form a smooth conical or tapering portion, which ends when its diameter has reached the diameter of a tube part of the exhaust tubes. After that the helical seaming process is continued for a suitable length, maintaining the diameter of the exhaust tube part.
A tube 4, corresponding to the shape of the tube 3 and having a diameter slightly larger than the diameter of the tube 3, is screwed onto the tube 3 utilizing the double threads formed by the profiling of the helical seam. This outer tube 4 strengthens the silencer to prevent any damage which shocks may cause, and at the same time acts as a double thermal insulation together with the tube 3. The tube 1 of the silencer is connected to a tube, or pipe, 5 of the exhaust system by means of connection pieces 6 and 7. The tubes 1 and 5 are helically-seamed tubes, thus having a double-thread profiling. The connection pieces 6 and 7 are provided with double-thread portions by means of which they are attached to the double-thread profiling of the respective tubes 1 and 5. Otherwise the tubes 6 and 7 are smooth tubes. The joining of the parts is illustrated in Figs. 4A, B and C
in greater detail. The tube 3 of the silencer is connected to the , :' .
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exhaust system by a connection piece in a corresponding manner.
Connection pieces can also be used for attaching other parts of the exhaust system to each other. The exhaust system is fixed to a vehicle by conventional attachment means.
As shown in Fig. 2, the inner part of the silencer is formed of an inner tube comprising a conical part 9 and a cylindrical part 11. A trans~erse guide plate lo is disposed at the junction of the tubes 9 and 11, which plate is attached by welding to an outer tube 8 of the inner part of the silencer. The guide plate 10 is provided with vane-like formations ~not shown in the Fig.) giving rise to turbulence of the gases in the inner part of the silencer. The outer tube 8 of the inner part of the silencer is bent at its both ends against the respective part 9 or 11 of the inner tube so as to form at its ends a structure shown in Figs. 2a and 2b. The inner part of the silencer is attached at its ends to the conical portions 1 and 3 of the outer tube. The attachment is accomplished by means of the double threads of the helically-seamed profiling. The outer tube of the inner part of the silencer is provided with perforations to enable the circulation of gases. In addition, the inner tube 9, 11 of the inner part of the silencer is provided with perforations over a short distance close to the transverse guide plate 10, also to improve the circulation of gases.
Fig. 3 shows a suitable seam structure 12 by which adjacent strip turns 13 and 14 are attached to each other. This seam 12 has proven to be absolutely gas-tight.
Fig. 4a shows two helically-seamed tubes 15 and 16 which can be screwed more or less deeply one into the other, utilizing the screw-threads formed by a profiling 18, in which case their diameters "
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, i are, of course, slightly different is size. The tubes 15 and 16 can be screwed one into the other so that their seams 12 will be against each other. The tubes 15 and 16 are illustrated as being provided with an undulating profile of two crests, which may equally well be of another shape and have one or more crests. The profiling has at least four tasks important in view of the invention, part of which have already been indicated above: first, the profiling serves as screw-threads by means of which the different parts of the exhaust pipe as well as the silencer may be attached to each other so that their lengths can be adjusted; secondly, the profiling makes the tubes suitably bendable without any risk of buckling; thirdly, the I profiling increases the cooling surface and the breaking of sound 3 waves, in some cases even to the extent that the inner part of the silencer becomes unnecessary; and fourthly, the profiling and the seaming increase the resilient properties of the exhaust system so ~' that it will not easily fracture.
f Fig. 4b illustrates the joining of the connection piece 6 to the profiled 18 double threads of the helically-seamed tube 16. The ~-' thread portions 17 provided in the connection piece correspond to the ; -, ` double-thread portions 18 of the helically-seamed tube.
, Fig. 4c illustrates the joining of the connection pieces 6`f and 7 to each other with relatively loose fitting. Both of the connection pieces have the thread portions 17 corresponding to the 3 double thread of the helically-seamed profiling.
, The attachment of the parts of the exhaust pipe-silencer combination to each other by means of the connection pieces and/or the double threads of the helically-seamed profiling constitutes a ~, gas-tight joint, thus preventing any leakage of gases therefrom.
The exhaust pipes and silencers according to the invention :-' :
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are very suitable for use as spare parts for different motor vehicles, because from e.g. standard-size parts it is possible to assemble easily exhaust systems of exhaust pipes and silencers of varying lengths, and to bend them into desired shape even without any ~J
tools.
The preceding description of the invention is merely exemplary with reference to the Figures of the drawing. However, it ~; is hereby not desired to restrict the invention only to the examples illustrated in the Figures. Numerous modifications are feasible ¦ within the inventive idea defined in the following claims.
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Claims (8)
1. A method for manufacturing parts for use in an exhaust-pipe silencer combination, said method comprising the steps of;
helically seaming one or more metal strips to form a plurality of outer tubes of said silencer such that each one of said plurality of outer tubes has a respective cylindrical portion; and helically sealing said plurality of outer tubes of said cylinder such that each one of said plurality of outer tubes has a respective conical portion tapering to a diameter substantially equivalent to that of an exhaust pipe to which it is connected by one or more connection pieces.
helically seaming one or more metal strips to form a plurality of outer tubes of said silencer such that each one of said plurality of outer tubes has a respective cylindrical portion; and helically sealing said plurality of outer tubes of said cylinder such that each one of said plurality of outer tubes has a respective conical portion tapering to a diameter substantially equivalent to that of an exhaust pipe to which it is connected by one or more connection pieces.
2. The method of claim 1, further comprising helically sealing each of said plurality of said tubes to comprise another respective cylindrical portion thereof, said respective cylindrical portion being equivalent to that of said exhaust pipe, said another cylindrical portion being connected to said one or more connection pieces.
3. The method of claim 1, wherein said plurality of outer tubes comprises two outer tubes each having said respective conical portion, said two outer tubes being attached to each other by means of a helically-seamed one of said one or more connection parts.
4. An exhaust pipe-silencer combination, particularly for motor vehicles, comprising:
an exhaust pipe of substantially cylindrical cross-section;
a first outer tube having a substantially cross-section and having a diameter larger than the diameter of said exhaust pipe;
second and third outer tubes each comprising a conical cross-section, said respective conical cross-sections and a cylindrical cross-section of said second and third outer tubes forming an outer mantle of said silencer and said second and fourth outer tubes being connected to each other by said first outer tube;
an inner tube comprising a cylindrical portion and a conical portion connected to said cylindrical portion; and said inner tube being connected to said outer mantle by means of respective screw threads on connecting surfaces of said inner tube and said outer mantle.
an exhaust pipe of substantially cylindrical cross-section;
a first outer tube having a substantially cross-section and having a diameter larger than the diameter of said exhaust pipe;
second and third outer tubes each comprising a conical cross-section, said respective conical cross-sections and a cylindrical cross-section of said second and third outer tubes forming an outer mantle of said silencer and said second and fourth outer tubes being connected to each other by said first outer tube;
an inner tube comprising a cylindrical portion and a conical portion connected to said cylindrical portion; and said inner tube being connected to said outer mantle by means of respective screw threads on connecting surfaces of said inner tube and said outer mantle.
5. The exhaust pipe-silencer combination of claim 4, further comprising a fourth tube having double threads formed by the profiling of a helical seam thereon, said fourth tube having a slightly larger diameter than said cylindrical portions of said second and third tubes, and said fourth tube being screwed onto said cylindrical portions of said second and third tubes forming an outer mantle of said silencer.
6. The exhaust pipe-silencer combination of claim 4, further comprising a plurality of connection pieces, each connection piece having a double-thread portion, and an exhaust tube, said plurality of connection pieces connecting said exhaust tube and said second outer tube.
7. The exhaust pipe-silencer combination of claim 4, further comprising a transverse guide plate and a first inner tube of said silencer, said transverse guide plate extending across said first inner tube and contacting inner walls thereof such that the efficiency of circulation of gas within said silencer is improved.
8. The exhaust pipe-silencer combination of claim 7, wherein said first inner tube of said silencer, a second inner tube of said silencer and a third inner tube of said silencer each has perforations spaced at intervals over a part of its length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2011071 CA2011071A1 (en) | 1990-02-28 | 1990-02-28 | Exhaust pipe-silencer and a method for manufacturing parts thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2011071 CA2011071A1 (en) | 1990-02-28 | 1990-02-28 | Exhaust pipe-silencer and a method for manufacturing parts thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2011071A1 true CA2011071A1 (en) | 1991-08-31 |
Family
ID=4144402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2011071 Abandoned CA2011071A1 (en) | 1990-02-28 | 1990-02-28 | Exhaust pipe-silencer and a method for manufacturing parts thereof |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2011071A1 (en) |
-
1990
- 1990-02-28 CA CA 2011071 patent/CA2011071A1/en not_active Abandoned
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| Date | Code | Title | Description |
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| FZDE | Dead |