GB1601090A - Exhaust systems - Google Patents

Exhaust systems Download PDF

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Publication number
GB1601090A
GB1601090A GB2925877A GB2925877A GB1601090A GB 1601090 A GB1601090 A GB 1601090A GB 2925877 A GB2925877 A GB 2925877A GB 2925877 A GB2925877 A GB 2925877A GB 1601090 A GB1601090 A GB 1601090A
Authority
GB
United Kingdom
Prior art keywords
pipes
pipe
end portion
interfitting
die
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
Application number
GB2925877A
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.)
HARMO IND Ltd
Original Assignee
HARMO IND 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
Application filed by HARMO IND Ltd filed Critical HARMO IND Ltd
Priority to GB2925877A priority Critical patent/GB1601090A/en
Priority to BE6/46853A priority patent/BE876709A/en
Publication of GB1601090A publication Critical patent/GB1601090A/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
    • F16L13/14—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling
    • F16L13/16—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling the pipe joint consisting of overlapping extremities having mutually co-operating collars
    • F16L13/161—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling the pipe joint consisting of overlapping extremities having mutually co-operating collars the pipe or collar being deformed by crimping or rolling
    • 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
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body

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

Description

(54) IMPROVMENTS IN AND RELATING TO EXHAUST SYSTEMS (71) We, HARMO INDUSTRIES LIMITED, a British Company of Wharfdale Road, Birmingham, West Midlands, do hereby declare the invention, for which we pray that a Patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to exhaust systems for internal combustion engines primarily, but not exclusively, for land vehicles, and in particular is concerned with the attachment of one pipe to another pipe in such a system.
An exhaust system usually comprises an exhaust silencer having an inlet and an outlet, a pipe which is connected at one end thereof to a stub pipe projecting from the inlet of the silencer and at its other end to the engine manifold, and a further pipe which is connected at one end thereof to a stub pipe projecting from the outlet of the silencer and either constitutes a tail pipe leading to atmosphere or is connected at its other end to an inlet stub pipe of a further silencer having a tailpipe connected to an outlet stub pipe thereof. In such a system the present invention is applicable to the connection of a pipe to a stub pipe of a silencer. However, it is to be understood that there is no limitation in this regard since the invention can be applied to the attachment together of any two pipes of an exhaust system.
The invention has for its object to provide a form of attachment of one pipe to another pipe in an exhaust system which eliminates the need for clamps or welding as conventionally used for this purpose and can therefore be effected more quickly and cheaply.
According to a first aspect of the invention we provide in an exhaust system for an internal combustion engine, an assembly of two pipes wherein an end portion of one of the pipes is received within an end portion of the other pipe, the outer one of said end portions is formed with at least two internal circumferentially extending, axially spaced ribs which are each engaged in an external circumferentially extending groove in the inner end por tion whereby the pipes are secured together against relative axial movement, and the said end portions are also formed with interfitting formations securing the pipes against relative turning movement.
The said interfitting formations preferably comprise internal recesses formed in the outer end portion and external projections formed on the inner end portion and engaged in the recesses.
Preferably two pairs of said interfitting projections and recesses are provided at respectively opposite sides of each circumferentially extending rib.
According to a second aspect of the in vention there is provided a method of attaching together two pipes in an exhaust system for an internal combustion engine, which comprises inserting an end portion of one of the pipes into an end portion of the other pipe and then deforming the pipes to provide the outer one of said end portions with at least two internal circumferentially extending, axially spaced ribs which are each engaged in an external circumferentially extending groove in the inner end portion whereby the pipes are secured together against relative axial movement, and also to provide the end portions with interfitting formations securing the pipes against relative turning movement.
The deformation is preferably effected by a die comprising two die parts which are brought together so as to embrace said end portions of the pipes, the inner face of the die being formed with at least two axially spaced3 inwardly projecting ribs which, when the die parts are brought together, form the pairs of interfitting circumferentially extending grooves and ribs by displacing material of the end portions inwardly at two axially spaced locations.
The invention will now be described, by way of example, with reference to the accompanying drawing which is a side view, partly in longitudinal section, of a pipe connected to a stub pipe of a silencer in an exhaust system according to one embodiment of the invention.
Referring to the drawing, an exhaust system, for example for a motor car, includes a silencer 10 comprising a casing which is formed by securing two end wall parts to the opposite ends of a tubular side wall part. The silencer casing has at the end shown an aperture to which is connected a stub pipe 11.
A pipe 12, for example a bend connected or adapted for connection to an engine where the aperture shown is the inlet of the silencer, is connected to the stub pipe 11 by a form of attachment according to the present invention, the details of which will be apparent from the following description of the method of mating the connection.
The relevant end portion of the pipe 12 is initially cylindrical and is smaller in diameter than the outer end portion of the stub pipe 11 which is also initially cylindrical, so as to be a close sliding fit therein. The said end portion of the pipe 12 is inserted into the said end portion of the stub pipe 11 and the assembly is located in a jig.
Two die parts are brought together from opposite sides of the interfitting end portions of the pipes 11, 12 so as to embrace the latter and these die parts are shaped to deform the end portions by displacing the material thereof inwardly at two axially spaced circumferentially locations thereby to form two circumferentially extending grooves 13 externally on the inner pipe and two inwardly projecting continuous ribs 14 internally on the outer pipe, which ribs are complementary to and engaged in the grooves. The pipe 12 is thus keyed to the stub pipe 11 of the silencer 10, the pairs of interfitting rib and groove formations fixing the pipe 12 against axial movement relative to the stub pipe 11.
The inner face of each die part which comes into contact with the outer face of the end portion of the stub pipe 11 comprises a semicylindrical portion at one end thereof which engages the outermost end portion of the stub pipe to prevent it flaring outwardly on deformation of the pipe, an adjoining inwardly projecting rib to form the first pair of interfitting rib and groove formations, a second inwardly projecting rib at the other end of the die part to form the second pair of such formations, and an intermediate portion between the ribs which is semi-cylindrical and of a greater diameter than the semi-cylindrical end portion so that it does not engage and deform the stub pipe.
The die is split into its two parts along two planes extending respectively at opposite sides of the common axis of the interfitting end portions of the pipes, the two planes being parallel to and offset by equal amounts, e.g. 1/16", on opposite sides of a diametral plane extending through said axis. Thus, two pairs of planar faces of the die parts come into face-to-face contact at opposite sides of the pipes along the respective two planes when the die is closed. The die parts have small recesses at the junctions of these faces with the inwardly projecting ribs of the inner faces of the die parts so that as the material of the interfitting end portions is deformed by said ribs some material flows outwardly into said recesses to form small recesses internally in the outer pipe and small projections externally on the inner pipe which are engaged in said recesses.
Thus, each rib 14 and its associated groove 13 have two pairs of interfitting projections and recesses at opposite sides thereof.
This arrangement of the die, split into its two parts along two offset parallel planes spaced apart by for example Q" at opposite sides of a diametral plane of the pipes, results in the interfitting projections and recesses at opposite sides of the interconnected pipes being offset at opposite sides of said diametral plane. This stops the assembly twisting and the two pipes turning relative to one another.
WHAT WE CLAIM IS: 1. In an exhaust system for an internal combustion engine, an assembly of two pipes wherein an end portion of one of the pipes is received within an end portion of the other pipe, the outer one of said end portions is formed with at least two internal circumferentially extending, axially spaced ribs which are each engaged in an external circumferentially extending groove in the inner end portion whereby the pipes are secured together against relative axial movement, and the said end portions are also formed with interfitting formations securing the pipes against relative turning movement.
2. An assembly as claimed in Claim 1 wherein the said interfitting formations comprise internal recesses formed in the outer end portion and external projections formed on the inner end portion and engaged in the recesses.
3. An assembly as claimed in Claim 2 wherein two pairs of said interfitting projec tions and recesses are provided at respectively opposite sides of each circumferentially ex tending rib.
4. An assembly as claimed in Claim 3 wherein the two pairs of interfitting projections and recesses at opposite sides of each rib are offset from a diametral plane extending through the longitudinal axis of the assembly.
5. A method of attaching together two pipes in an exhaust system for an internal combustion engine, which comprises inserting an end portion of one of the pipes into an end portion of the other pipe and then deforming the pipes to provide the outer one of said end portions with at least two internal circum ferentially extending, axially spaced ribs which are each engaged in an external circumferentially extending groove in the inner end portion whereby the pipes are secured together against relative axial movement, and also to
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (12)

**WARNING** start of CLMS field may overlap end of DESC **. Referring to the drawing, an exhaust system, for example for a motor car, includes a silencer 10 comprising a casing which is formed by securing two end wall parts to the opposite ends of a tubular side wall part. The silencer casing has at the end shown an aperture to which is connected a stub pipe 11. A pipe 12, for example a bend connected or adapted for connection to an engine where the aperture shown is the inlet of the silencer, is connected to the stub pipe 11 by a form of attachment according to the present invention, the details of which will be apparent from the following description of the method of mating the connection. The relevant end portion of the pipe 12 is initially cylindrical and is smaller in diameter than the outer end portion of the stub pipe 11 which is also initially cylindrical, so as to be a close sliding fit therein. The said end portion of the pipe 12 is inserted into the said end portion of the stub pipe 11 and the assembly is located in a jig. Two die parts are brought together from opposite sides of the interfitting end portions of the pipes 11, 12 so as to embrace the latter and these die parts are shaped to deform the end portions by displacing the material thereof inwardly at two axially spaced circumferentially locations thereby to form two circumferentially extending grooves 13 externally on the inner pipe and two inwardly projecting continuous ribs 14 internally on the outer pipe, which ribs are complementary to and engaged in the grooves. The pipe 12 is thus keyed to the stub pipe 11 of the silencer 10, the pairs of interfitting rib and groove formations fixing the pipe 12 against axial movement relative to the stub pipe 11. The inner face of each die part which comes into contact with the outer face of the end portion of the stub pipe 11 comprises a semicylindrical portion at one end thereof which engages the outermost end portion of the stub pipe to prevent it flaring outwardly on deformation of the pipe, an adjoining inwardly projecting rib to form the first pair of interfitting rib and groove formations, a second inwardly projecting rib at the other end of the die part to form the second pair of such formations, and an intermediate portion between the ribs which is semi-cylindrical and of a greater diameter than the semi-cylindrical end portion so that it does not engage and deform the stub pipe. The die is split into its two parts along two planes extending respectively at opposite sides of the common axis of the interfitting end portions of the pipes, the two planes being parallel to and offset by equal amounts, e.g. 1/16", on opposite sides of a diametral plane extending through said axis. Thus, two pairs of planar faces of the die parts come into face-to-face contact at opposite sides of the pipes along the respective two planes when the die is closed. The die parts have small recesses at the junctions of these faces with the inwardly projecting ribs of the inner faces of the die parts so that as the material of the interfitting end portions is deformed by said ribs some material flows outwardly into said recesses to form small recesses internally in the outer pipe and small projections externally on the inner pipe which are engaged in said recesses. Thus, each rib 14 and its associated groove 13 have two pairs of interfitting projections and recesses at opposite sides thereof. This arrangement of the die, split into its two parts along two offset parallel planes spaced apart by for example Q" at opposite sides of a diametral plane of the pipes, results in the interfitting projections and recesses at opposite sides of the interconnected pipes being offset at opposite sides of said diametral plane. This stops the assembly twisting and the two pipes turning relative to one another. WHAT WE CLAIM IS:
1. In an exhaust system for an internal combustion engine, an assembly of two pipes wherein an end portion of one of the pipes is received within an end portion of the other pipe, the outer one of said end portions is formed with at least two internal circumferentially extending, axially spaced ribs which are each engaged in an external circumferentially extending groove in the inner end portion whereby the pipes are secured together against relative axial movement, and the said end portions are also formed with interfitting formations securing the pipes against relative turning movement.
2. An assembly as claimed in Claim 1 wherein the said interfitting formations comprise internal recesses formed in the outer end portion and external projections formed on the inner end portion and engaged in the recesses.
3. An assembly as claimed in Claim 2 wherein two pairs of said interfitting projec tions and recesses are provided at respectively opposite sides of each circumferentially ex tending rib.
4. An assembly as claimed in Claim 3 wherein the two pairs of interfitting projections and recesses at opposite sides of each rib are offset from a diametral plane extending through the longitudinal axis of the assembly.
5. A method of attaching together two pipes in an exhaust system for an internal combustion engine, which comprises inserting an end portion of one of the pipes into an end portion of the other pipe and then deforming the pipes to provide the outer one of said end portions with at least two internal circum ferentially extending, axially spaced ribs which are each engaged in an external circumferentially extending groove in the inner end portion whereby the pipes are secured together against relative axial movement, and also to
provide the end portions with interfitting formations securing the pipes against relative turning movement.
6. A method as claimed in Claim S wherein the deformation is such that said interfitting formations comprise internal recesses in the outer end portion and external projections on the inner end portion which are engaged in the recesses.
7. A method as claimed in Claim 5 or 6 wherein the deformation is effected by a die comprising two die parts which are brought together so as to embrace said end portions of the pipes, the inner face of the die being formed with at least two axially spaced, inwardly projecting ribs which, when the die parts are brought together, form the pairs of interfitting circumferentially extending grooves and ribs by displacing material of the end portions inwardly at two axially spaced locations.
8. A method as claimed in Claim 7 wherein the inner face of the die has a cylindrical portion between the ribs which is a diameter such that it does not deform the end portions and a cylindrical portion adjoining one of the ribs and formed to engage the free end of the outer end portion to prevent it flaring outwardly.
9. A method as claimed in Claim 7 or 8 when dependent on Claim 6 wherein the two die parts have two pairs of planar faces which, when the die parts are brought together, come into face-to-face contact at opposite sides of the end portions of the pipes, and the die parts are formed at the junctions of these faces and the ribs of the die with recesses into which material of the pipes is displaced outwardly to form two pairs of said interfitting projections and recesses at respectively opposite sides of each rib of the outer end portion.
10. A method as claimed in Claim 9 wherein the said pairs of faces of the die parts are disposed respectively in two planes which are offset from a diametral plane extending through the longitudinal axis of the end portions.
11. An exhaust silencer for an internal combustion engine having a pipe connected to a stub pipe thereof by an attachment substantially as herein described with reference to and as illustrated in the accompanying drawings.
12. A method of attaching together two pipes in an exhaust system for an internal combustion engine, substantially as herein described with reference to the accompanying drawing.
GB2925877A 1977-07-12 1977-07-12 Exhaust systems Expired GB1601090A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2925877A GB1601090A (en) 1977-07-12 1977-07-12 Exhaust systems
BE6/46853A BE876709A (en) 1977-07-12 1979-05-31 IMPROVEMENTS RELATING TO EXHAUST SYSTEMS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2925877A GB1601090A (en) 1977-07-12 1977-07-12 Exhaust systems

Publications (1)

Publication Number Publication Date
GB1601090A true GB1601090A (en) 1981-10-21

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ID=10288661

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Application Number Title Priority Date Filing Date
GB2925877A Expired GB1601090A (en) 1977-07-12 1977-07-12 Exhaust systems

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BE (1) BE876709A (en)
GB (1) GB1601090A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0123055A2 (en) * 1980-03-26 1984-10-31 Commissariat A L'energie Atomique Guide tubes dismantling and reconstructing method for a fuel assembly of a light water nuclear reactor
DE102007060398B4 (en) * 2007-12-14 2016-10-06 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Exhaust of a motor vehicle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0123055A2 (en) * 1980-03-26 1984-10-31 Commissariat A L'energie Atomique Guide tubes dismantling and reconstructing method for a fuel assembly of a light water nuclear reactor
EP0123055A3 (en) * 1980-03-26 1984-11-28 Commissariat A L'energie Atomique Etablissement De Caractere Scientifique Technique Et Industriel Guide tubes dismantling method for a fuel assembly of a light water nuclear reactor
DE102007060398B4 (en) * 2007-12-14 2016-10-06 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Exhaust of a motor vehicle

Also Published As

Publication number Publication date
BE876709A (en) 1979-09-17

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Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19980521