GB2141802A - Pipe joints-exhaust system - Google Patents

Pipe joints-exhaust system Download PDF

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Publication number
GB2141802A
GB2141802A GB08414885A GB8414885A GB2141802A GB 2141802 A GB2141802 A GB 2141802A GB 08414885 A GB08414885 A GB 08414885A GB 8414885 A GB8414885 A GB 8414885A GB 2141802 A GB2141802 A GB 2141802A
Authority
GB
United Kingdom
Prior art keywords
tubular element
helical grooves
tubular
exhaust system
tubular elements
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08414885A
Other versions
GB8414885D0 (en
GB2141802B (en
Inventor
Kenneth Mcdonald
Paul Lister
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TI BAINBRIDGE SILENCERS Ltd
Original Assignee
TI BAINBRIDGE SILENCERS Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB838316315A external-priority patent/GB8316315D0/en
Application filed by TI BAINBRIDGE SILENCERS Ltd filed Critical TI BAINBRIDGE SILENCERS Ltd
Priority to GB08414885A priority Critical patent/GB2141802B/en
Publication of GB8414885D0 publication Critical patent/GB8414885D0/en
Publication of GB2141802A publication Critical patent/GB2141802A/en
Application granted granted Critical
Publication of GB2141802B publication Critical patent/GB2141802B/en
Expired legal-status Critical Current

Links

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
    • F01N13/1844—Mechanical joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2310/00—Selection of sound absorbing or insulating material
    • F01N2310/02—Mineral wool, e.g. glass wool, rock wool, asbestos or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • F01N2450/26—Methods or apparatus for fitting, inserting or repairing different elements by bayonet fittings
    • 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
    • F01N2510/00—Surface coverings
    • F01N2510/08—Surface coverings for corrosion prevention
    • 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
    • F01N2530/00—Selection of materials for tubes, chambers or housings
    • F01N2530/02—Corrosion resistive metals
    • F01N2530/04—Steel alloys, e.g. stainless steel

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Abstract

A pair of tubular elements 14,20 of an exhaust system are joined together by inserting the end of one of the elements into a close fitting end of the other element and indenting the superimposed portions to form at least two mutually inclined helical grooves 21 in each tubular element, the helical grooves in one element engaging those in the other tubular element, to provide relative axial and rotational location. <IMAGE>

Description

SPECIFICATION Improvements in and relating to exhaust systems This invention relates to improvements in and relating to exhaust systems and in particular to the joining of tubular elements in an exhaust system.
According to one aspect of the present invention a method of joining a pair of tubular elements of an exhaust system comprises inserting an end of one tubular element into a close fitting end of the other tubular element and indenting the superimposed portions of the tubular elements to form a pair of mutually inclined helical grooves in each tubular element, said helical grooves in one tubualr element engaging those in the other tubular element to provide axial and rotational location thereof.
Additional helical grooves may be provided, these grooves being inclined to at least one of said pair of grooves. In order to provide a gas-tight joint the helical grooves preferably extend about at least a substantial part of the periphery of each tubular element. Also prior to forming the helical grooves the superimposed portions of the tubular elements may be sized. Where there is access to the inside of the inner tubular element this is preferably done by expanding the inner tubular element using, for example, an expanding mandrel. However, the outer tubular element may be reduced down onto the inner tubular element.
The helical grooves may conveniently be formed by clamping the superimposed portions of the tubular elements between two or more dies, each die having an inclined slot, so that a suitably shaped press tool may be introduced into the slot to swage the tubular elements and form the helical grooves therein. The dies may also be arranged to reduce the outer tube onto the superimposed portion of the inner tube, particularly at the free end of the outer tube.
The method described above provides a joint between the tubular elements which is reasonably gas-tight and which locates the tubular elements both axially and rotationally relative to one another.
An embodiment of the invention is now described by way of example only with reference to the accompanying drawing which shows a part sectional view of an exhaust system, illustrating the joint between a silencer and an exhaust pipe.
The exhaust system illustrated comprises a silencer 10 having a cylindrical outer casing 11 formed from sheet metal, the free edges of which are folded together to form a gas-tight seam. The ends of the casing 11 are closed by end plates 12. These end plates 12 are provided with peripheral flanges 13 which engage the internal surface of the end of the casing 11 and are joined thereto, in gas-tight manner, by folding the engaging portion together.
A perforated tube 14, coaxial with the cylindrical casing 11 extends through the casing 11 and is supported by flanged holes 15, through the end plates 12. The perforated tube 14 may be seam welded. The perforations 16, which are restricted to the portion of the tube between the end plates 12, may be drilled in the formed tube. However, it is preferred to form the perforations in the sheet metal before it is formed into the tube 14.
The perforated tube 14 is located axially of the casing 11 and the end plates 12 by means of ribs 17 which are formed in the non-perforated portions of the tube 14 which pass through the end plates 12.
These ribs 17 are formed in pairs, one engaging each side of the flanged hole 15 in the end plate 12. The ribs 17 may conveniently be formed by means of an expanding mandrel which is positioned within the end of the tube 14, after it has been assembled with the casing 11, the mandrel then being expanded to form a rib 17 on each side of the end plate 12. At the same time as forming the ribs 17, the mandrel may also be arranged to size the tube 14 to the flanged hole 15, thereby forming a gas-tight joint. The expanding mandrel may also be arranged to rase one or more circumferentially spaced projections 18 in the portion of the tube 14 between ribs 17. These projections 18 forming corresponding engaging formations in the overlying flange of hole 15, thereby preventing rotation between the end plate 12 and tube 14.
The space between the perforated tube 14 and the outer casing 11, is packed with sound absorbing material, for example glass fibre, in conventional manner.
The silencer 10 is connected to an exhaust pipe 20, the end of the exhaust pipe 20 engaging within the non-perforated portion of the tube 14 extending from the end plate 12 of silencer 10. The exhaust pipe 20 is secured both axially and rotationally with respect to the tube 14 by indenting the engaging portions of the tube 14 and pipe 20 with a pair of oppositely inclined helical grooves 21. Each groove 21 extends about substantially half the periphery of the tube 14. The end of tube 14 is also reduced down onto the pipe 20 to ensure a gas-tight joint and neat appearance.
The helical grooves 21 may be formed by clamping a pair of dies about the engaged portions of tube 14 and pipe 20. These dies may be arranged to reduce the end of tube 14 onto the pipe 20. Suitably shaped press tools are then brought into contact with the outer surface of the tube 14, through inclined slots in the dies and these press tools indent the tube 14 and pipe 20 to form grooves 21.
The silenceriexhaust pipe assembly described above has the advantage that a part from the seam of the perforated tube, all the joints and seams are formed mechanically. The exhaust system may consequently be formed from coated steel, for example aluminised steel, without damage to the protective coating. A similar form of construction may also be adopted with the other forms of silencers, for example multi-tube silencers in which the gas flow tubes may also be jointed to the internal baffles, as well as the end plates, in the manner described above; or to other components, for example catalylic converters.
The method of joining the silencer to the exhaust pipe may also be used with silencers or similar components of other, for example welded constructions; and also for joining two lengths of exhaust pipe together.

Claims (13)

1. A method of joining a pair of tubular elements of an exhaust system comprising inserting an end of one tubular element into a close fitting end of the other tubular element and indenting the superimposed portions of the tubular elements to form a pair of mutually inclined helical grooves in each tubular element, said helical grooves in one tubular element engaging those in the other tubular element to provide axial and rotational location thereof.
2. A method according to Claim 1 in which additional helical grooves are provided which are inclined to at least one of said pair of grooves.
3. A method according to Claim 1 or 2 in which the helical grooves extend around at least a substantial part of the periphery of the tubular elements.
4. A method according to any one of Claims 1 to 3 in which the helical grooves are formed in the same axial portion of the superimposed portions of the tubular elements.
5. A method according to any one of the preceding claims in which the grooves are oppositely inclined with respect to the axis of the tubular elements.
6. A method according to any one of the preceding claims in which the superimposed portions of the tubular elements are sized prior to the formation of the helical grooves.
7. A method according to Claim 6 in which the inner tubular element is expanded against the superimposed portion of the outer tubular element.
8. A method according to any one of the preceding claims in which the free end of the outer tubular element is reduced down onto the superimposed portion of the inner tubular element.
9. A method according to any one of the preceding claims in which the superimposed portions of the tubular elements are clamped between two or more dies, said dies having inclined slots through which suitably shaped press tools may be introduced to form the helical grooves.
10. A method according to Claim 9 in which the dies are arranged to compress the end of the outer tubular element onto the superimposed portion of the inner tubular element.
11. A method of joining a pair of tubular elements of an exhaust system substantially as described herein, with reference to the accompanying drawing.
12. An exhaust system formed by the method claimed in any one of Claims 1 to 11.
13. An exhaust system substantially as described herein with reference to, and as shown in the accompanying drawing.
GB08414885A 1983-06-15 1984-06-11 Pipe joints-exhaust system Expired GB2141802B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08414885A GB2141802B (en) 1983-06-15 1984-06-11 Pipe joints-exhaust system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB838316315A GB8316315D0 (en) 1983-06-15 1983-06-15 Exhaust silencers
GB08414885A GB2141802B (en) 1983-06-15 1984-06-11 Pipe joints-exhaust system

Publications (3)

Publication Number Publication Date
GB8414885D0 GB8414885D0 (en) 1984-07-18
GB2141802A true GB2141802A (en) 1985-01-03
GB2141802B GB2141802B (en) 1986-10-15

Family

ID=26286371

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08414885A Expired GB2141802B (en) 1983-06-15 1984-06-11 Pipe joints-exhaust system

Country Status (1)

Country Link
GB (1) GB2141802B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2203077A (en) * 1987-03-03 1988-10-12 Gilardini Spa Pipe with an end flange for vehicle engine exhaust gases
GB2233591A (en) * 1989-04-13 1991-01-16 Atsugi Unisia Corp Method of mounting spring seat on a hydraulic damping device
EP0853512A1 (en) * 1996-06-18 1998-07-22 Northrop Grumman Corporation Method and forming die for fabricating spiral groove torque tube assemblies
WO2007134865A1 (en) * 2006-05-24 2007-11-29 Emcon Technologies Germany (Augsburg) Gmbh Housing for a component of an exhaust system and such a component

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB202285A (en) * 1922-08-12 1924-06-05 Heddernheimer Kupferwerk Und S Method of making connections in wire ropes and the like
GB343967A (en) * 1929-08-27 1931-02-27 Milto Messinesi Improvements in or relating to the joining of metal tubes
GB2032557A (en) * 1978-10-27 1980-05-08 Deutsch Co Metal Components Fittings for fluid-tight connection to tubular members

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB202285A (en) * 1922-08-12 1924-06-05 Heddernheimer Kupferwerk Und S Method of making connections in wire ropes and the like
GB343967A (en) * 1929-08-27 1931-02-27 Milto Messinesi Improvements in or relating to the joining of metal tubes
GB2032557A (en) * 1978-10-27 1980-05-08 Deutsch Co Metal Components Fittings for fluid-tight connection to tubular members

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2203077A (en) * 1987-03-03 1988-10-12 Gilardini Spa Pipe with an end flange for vehicle engine exhaust gases
GB2233591A (en) * 1989-04-13 1991-01-16 Atsugi Unisia Corp Method of mounting spring seat on a hydraulic damping device
US5129137A (en) * 1989-04-13 1992-07-14 Atsugi Unisia Corp. Method of mounting a spring seat on a hydraulic damping device
GB2233591B (en) * 1989-04-13 1993-07-21 Atsugi Unisia Corp Method of mounting annular member on tubular member
EP0853512A1 (en) * 1996-06-18 1998-07-22 Northrop Grumman Corporation Method and forming die for fabricating spiral groove torque tube assemblies
EP0853512A4 (en) * 1996-06-18 1998-07-22
WO2007134865A1 (en) * 2006-05-24 2007-11-29 Emcon Technologies Germany (Augsburg) Gmbh Housing for a component of an exhaust system and such a component

Also Published As

Publication number Publication date
GB8414885D0 (en) 1984-07-18
GB2141802B (en) 1986-10-15

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19920611