EP0067246A2 - Silencieux et méthode de sa fabrication - Google Patents

Silencieux et méthode de sa fabrication Download PDF

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Publication number
EP0067246A2
EP0067246A2 EP81109380A EP81109380A EP0067246A2 EP 0067246 A2 EP0067246 A2 EP 0067246A2 EP 81109380 A EP81109380 A EP 81109380A EP 81109380 A EP81109380 A EP 81109380A EP 0067246 A2 EP0067246 A2 EP 0067246A2
Authority
EP
European Patent Office
Prior art keywords
pipes
silencer
baffles
fact
edge
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.)
Withdrawn
Application number
EP81109380A
Other languages
German (de)
English (en)
Other versions
EP0067246A3 (fr
Inventor
Alfredo Sala
Attilio Marzorati
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.)
IAO Industrie Riunite SpA
Original Assignee
IAO Industrie Riunite SpA
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 IAO Industrie Riunite SpA filed Critical IAO Industrie Riunite SpA
Publication of EP0067246A2 publication Critical patent/EP0067246A2/fr
Publication of EP0067246A3 publication Critical patent/EP0067246A3/fr
Withdrawn legal-status Critical Current

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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
    • F01N13/1838—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
    • F01N13/185—Mechanical joints the connection being realised by deforming housing, tube, baffle, plate, or parts thereof
    • 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
    • F01N2450/20—Methods or apparatus for fitting, inserting or repairing different elements by mechanical joints, e.g. by deforming housing, tube, baffle plate or parts thereof

Definitions

  • the present invention relates to silencer for motor vehicles, as well as the corresponding process of manufacture, which has a considerable utility, particularly for the considerable simplification obtained in the process of making the silencer, with a relevant drastic reduction of its manufacturing cost.
  • the internal components of the silencers for motor vehicles i.e. the transversal baffles and the longitudinal pipes, are presently joined each other by welding, and this working process has a number of drawbacks of considerable relevance.
  • a first drawback consists of the high costs of the welding process; in order to join the baffles to the pipes, there are two factors which can neither be removed nor be decreased, namely the cost of metal, namely welding rod or wire and the slowness of the process, dependent on the melting speed.
  • a second drawback consist of the geometric progression by which manufacturing time and cost are increasing, according to the number of pipes and baffles which are present in the silencer; in fact, if one has a silencer with four pipes and four baffles, the time to carry out its welding will be about sixteen times greater than that required for a silencer with one pipe and one diaphragm, as well as its manufacturing cost.
  • a third drawback consists in the necessity of employing personnel skilled and specialized in welding, which is always a dirty, heavy and non hygienic work, for which one can find less and less operators available, where the quality of work widely depends on the skillfulness and willingness of the operator.
  • Another drawback is at last represented by thermal stresses induced in the material by melting, said stresses generating cracks, failures, flaws and other drawbacks (such as local temper brittleness) which are detrimental to the uniformity of quality.
  • the present invention solves all these problems and removes all the above mentioned drawbacks, providing for joining the baffles to the pipes by a process of internal seaming and heading of the pipes around the holes for passage of the baffles, avoiding any internal welding and giving a considerable number of advantages, of which the principal ones are indicated hereinafter.
  • a first advantage is the low manufacturing cost, as there is no thermal treatment and therefore no fixed cost dependent on the operation; the speed is maximum: deformation of the internal pipes fastens the baffles in the their relevant positions, all at the same time and in few seconds (2-3 seconds).
  • a second advantage is that seaming of all baffles occurs at the same time on all the pipes, so that the time for seaming a silencer with one baffle and one pipe is the same as for a silencer with four baffles and four pipes; thus in the latter case the manufacturing cost is about 3% of the cost of the welding operation.
  • a third advantage is that any operator may be able to carry out this operation, as he has only to load and unload the workpieces, i.e. a light work in an enviroment free of smoke, heat and reverberation, with an operation which is ten times quickier than welding, in which the quality is automatically warranted by the machine and does not depend in any way on the operator.
  • a further advantage is finally represented by that the internal seaming takes place with a mechanical process of cold deformation, gradually induced by the hydraulic pushing means, so as to obtain the best compromise possible between blocking force and possibility of deformation of the sheet plate, thus with a number of rejects which is pratically reduced to null.
  • Fig. 1 shows a portion of a baffle 1 on which one or more holes are made, whose rim is bent so as to make an inner edge 2.
  • Pipe 3 inserted into the hole, undergoes a process of gradual cold deformation by means of a suitable tool, so as to make two waves or dimples 4 and 5 between which the hole edge 2 is clamped and blocked against the sheet plate of the pipe 3 so as to effect the stable, safe and resistant connection of the two elements, by means of pressure and deformation of the two matching surfaces,
  • a powered equipment all the baffles can be seamed at the same time on all the pipes of a silencer.
  • Fig. 2 shows a similar portion of baffle 10 whose hole is clean cut with a sharp corner.
  • the waves 12 and 13 are formed on the pipe 11 with the above mentioned process, the waves are headed against the baffle edge with a second operation of squashing deformation so as to obtain a stable clamping of elements between each other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Exhaust Silencers (AREA)
EP81109380A 1981-06-15 1981-10-30 Silencieux et méthode de sa fabrication Withdrawn EP0067246A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2208381U IT8122083V0 (it) 1981-06-15 1981-06-15 Marmitta di scarico perfezionata.
IT2208381U 1981-06-15

Publications (2)

Publication Number Publication Date
EP0067246A2 true EP0067246A2 (fr) 1982-12-22
EP0067246A3 EP0067246A3 (fr) 1983-08-10

Family

ID=11191234

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81109380A Withdrawn EP0067246A3 (fr) 1981-06-15 1981-10-30 Silencieux et méthode de sa fabrication

Country Status (2)

Country Link
EP (1) EP0067246A3 (fr)
IT (1) IT8122083V0 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2649469A1 (fr) * 1989-07-04 1991-01-11 Wimetal Sa Tube, notamment pour ligne d'echappement pour vehicule automobile et comportant au moins un organe de liaison
FR2704621A1 (fr) * 1993-04-27 1994-11-04 Manuli Automobile France Sa Ensemble formé d'une plaque connectée à un tube, pour fixation d'un tube sur une pièce et bloc tube/pièce ainsi obtenu.
WO1998058165A1 (fr) * 1997-06-16 1998-12-23 Delaroy Sdn.Bhd Tampon de section de tube
CN108194186A (zh) * 2017-12-29 2018-06-22 北京汽车研究总院有限公司 一种卡箍连接结构、排气管总成和汽车
DE102005026376C5 (de) * 2005-06-08 2019-05-02 Faurecia Emissions Control Technologies, Germany Gmbh Fahrzeugschalldämpfer

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1735789A (en) * 1926-08-27 1929-11-12 Herbert S Powell Muffler
GB1214989A (en) * 1967-10-05 1970-12-09 Quinton Hazell Silencers Ltd Improvements relating to exhaust gas silencers for internal combustion engines
FR2173458A5 (fr) * 1972-02-25 1973-10-05 Peugeot
FR2223553A1 (fr) * 1973-03-29 1974-10-25 Hess Rainer
FR2457969A1 (fr) * 1977-07-09 1980-12-26 Harmo Ind Ltd Pot d'echappement, notamment pour les moteurs a combustion interne

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1735789A (en) * 1926-08-27 1929-11-12 Herbert S Powell Muffler
GB1214989A (en) * 1967-10-05 1970-12-09 Quinton Hazell Silencers Ltd Improvements relating to exhaust gas silencers for internal combustion engines
FR2173458A5 (fr) * 1972-02-25 1973-10-05 Peugeot
FR2223553A1 (fr) * 1973-03-29 1974-10-25 Hess Rainer
FR2457969A1 (fr) * 1977-07-09 1980-12-26 Harmo Ind Ltd Pot d'echappement, notamment pour les moteurs a combustion interne

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2649469A1 (fr) * 1989-07-04 1991-01-11 Wimetal Sa Tube, notamment pour ligne d'echappement pour vehicule automobile et comportant au moins un organe de liaison
FR2704621A1 (fr) * 1993-04-27 1994-11-04 Manuli Automobile France Sa Ensemble formé d'une plaque connectée à un tube, pour fixation d'un tube sur une pièce et bloc tube/pièce ainsi obtenu.
WO1994025788A1 (fr) * 1993-04-27 1994-11-10 Manuli Automobile France Ensemble de fixation pour un tube
WO1998058165A1 (fr) * 1997-06-16 1998-12-23 Delaroy Sdn.Bhd Tampon de section de tube
US6345687B1 (en) 1997-06-16 2002-02-12 Denis Thorpe Tube end closure
DE102005026376C5 (de) * 2005-06-08 2019-05-02 Faurecia Emissions Control Technologies, Germany Gmbh Fahrzeugschalldämpfer
CN108194186A (zh) * 2017-12-29 2018-06-22 北京汽车研究总院有限公司 一种卡箍连接结构、排气管总成和汽车

Also Published As

Publication number Publication date
EP0067246A3 (fr) 1983-08-10
IT8122083V0 (it) 1981-06-15

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Effective date: 19840809

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Inventor name: SALA, ALFREDO

Inventor name: MARZORATI, ATTILIO