EP0947674A2 - Schalldämpfer für eine interne Brennkraftmaschine - Google Patents

Schalldämpfer für eine interne Brennkraftmaschine Download PDF

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Publication number
EP0947674A2
EP0947674A2 EP99105157A EP99105157A EP0947674A2 EP 0947674 A2 EP0947674 A2 EP 0947674A2 EP 99105157 A EP99105157 A EP 99105157A EP 99105157 A EP99105157 A EP 99105157A EP 0947674 A2 EP0947674 A2 EP 0947674A2
Authority
EP
European Patent Office
Prior art keywords
portions
external shell
muffler
mufflers
production
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Withdrawn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
EP99105157A
Other languages
English (en)
French (fr)
Other versions
EP0947674A3 (de
Inventor
Carlo Polini
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.)
Polini Motori SpA
Original Assignee
Polini Motori 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 Polini Motori SpA filed Critical Polini Motori SpA
Publication of EP0947674A2 publication Critical patent/EP0947674A2/de
Publication of EP0947674A3 publication Critical patent/EP0947674A3/de
Withdrawn legal-status Critical Current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
    • F01N13/1861—Construction facilitating manufacture, assembly, or disassembly the assembly using parts formed by casting or moulding
    • F01N13/1866—Construction facilitating manufacture, assembly, or disassembly the assembly using parts formed by casting or moulding the channels or tubes thereof being made integrally with the housing
    • 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
    • F01N13/16—Selection of particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1888—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2530/00—Selection of materials for tubes, chambers or housings
    • F01N2530/06—Aluminium or alloys thereof

Definitions

  • the present invention relates to an exhaust muffler, or silencer for the discharging of exhaust-derived gases from an internal combustion engine.
  • mufflers that exploit reflection of acoustic waves comprise a plurality of expansion chambers and connecting pipes, fit to define an outflow course for the exhaust gases that presents significant variations in section.
  • the reflection of acoustic waves occurs corresponding to duct discontinuities constituted by abrupt changes of section and the acoustic waves thus reflected are subsequently transformed into heat in contact with the boundary layer in contact with the walls, thus causing the desired attenuation of the sound.
  • the number and geometry of the expansion chambers, the dimensions of the throats of the connecting pipes and the material used are parameters determining the noise reduction characteristics of the muffler.
  • Embodiments of mufflers of the acoustic-wave reflection type comprising both external shell elements and internal dividing elements, also assembled by welding, are well known.
  • mufflers that in order to be easily assembled, comprise two single external shell elements, or half-shells, joined together within which are lodged one or more dividing elements of the same muffler which, suitably shaped, define the expansion chambers and the connecting pipes which serve to reduce the noise.
  • the muffler according to the invention comprises at least two portions of external shell reciprocally joined and internal separators in one-piece with at least one of the said portions of external shell to form a passage for the exhaust-derived gases from the exhaust manifold of the engine.
  • such course could present expansion chambers and connecting pipes which serve to reduce the noise by reflection of the acoustic waves.
  • this muffler is produced by means of two half-shells specular with respect to a longitudinal axis, reciprocally joined, within which are obtained in one-piece the same internal dividing pieces.
  • the joining of such portions of external shell is effected by means of removable fasteners, such as bolts or similar.
  • a further aspect of the present invention provides that the exhaust muffler be produced in aluminum or in thermo-resistant light alloy, such as for instance an aluminum-based or a magnesium-based alloy, preferably by die-casting.
  • the muffler according to the invention indicated as a whole by 100, comprises two half-shells 1 and 2, specular with respect to the axis C in figure 1, that present a perimeter mating edge 3 and internal separators 4 produced in one-piece with the two half-shells 1 and 2.
  • the half-shells 1 and 2 are shaped to produce, when joined up together, an outflow course for the exhaust-derived gases from the exhaust manifold of the engine.
  • such outflow course of the gases comprises the entry section, or opening, 10, the expansion chambers 5, 6, 7, the connecting pipes 8 and 9, and the exit section, or opening, 11.
  • the half-shells 1 and 2 are advantageously produced in aluminum, or in an aluminum-based light alloy, or in other thermo-resistant light alloys, such as, for instance, magnesium- or titanium-based alloys, by die-casting process.
  • the die-casting process allows castings with very precise contours and low tolerances to be got, which reduces the need for further working after the same casting.
  • the die-casting molding of the muffler also allows external details to be produced easily, such as the cooling fins 15 shown in Figure 2.
  • the mating of the two half-shells 1 and 2 is achieved preferentially by means of removable means of fastening, such as bolts or similar, that engage in flanges 12 set in the perimeter mating edge 3 of each external half-shell 1 and 2.
  • sealing 13 such as, for instance, gaskets in synthetic material, set between the half-shells 1 and 2 at least along the perimeter edges 3a and 3b.
  • such means of sealing 13 are preferably lodged in a hollow 14 produced along the perimeter edge 3a of the external half-shell 1; in other embodiments, not shown in the figures, such means of sealing could be set both between the perimeter edges 3 and between the separators 4 of the two joined half-shells 1 and 2.
  • Means of removable joining are provided between the muffler 100 and the exhaust manifold of the engine, placed in proximity to the entry opening 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Exhaust Gas After Treatment (AREA)
EP99105157A 1998-04-03 1999-03-29 Schalldämpfer für eine interne Brennkraftmaschine Withdrawn EP0947674A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1998LC000002A IT1306539B1 (it) 1998-04-03 1998-04-03 Marmitta di scarico per motori a combustione interna
ITLC980002 1998-04-03

Publications (2)

Publication Number Publication Date
EP0947674A2 true EP0947674A2 (de) 1999-10-06
EP0947674A3 EP0947674A3 (de) 2000-01-12

Family

ID=11355654

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99105157A Withdrawn EP0947674A3 (de) 1998-04-03 1999-03-29 Schalldämpfer für eine interne Brennkraftmaschine

Country Status (3)

Country Link
EP (1) EP0947674A3 (de)
ES (1) ES2137913T1 (de)
IT (1) IT1306539B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1126139A2 (de) * 2000-02-16 2001-08-22 Kabushiki Kaisha Kobe Seiko Sho Schalldämpfer aus einer Titan-Legierung

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1476491A1 (de) * 1963-06-17 1969-10-02 Cie Generale Du Duralumin Et D Auspufftopf
US4084658A (en) * 1976-11-05 1978-04-18 Custom-Bilt Tunable expansion chamber for internal combustion engines
JPS59108815A (ja) * 1982-12-14 1984-06-23 Kawasaki Heavy Ind Ltd ２サイクルエンジンの排気装置
DE3516442A1 (de) * 1985-05-08 1986-11-13 Jörg Prof. Dipl.-Ing.(FH) 7072 Heubach Linser Schalldaempfer
EP0513850A2 (de) * 1989-08-30 1992-11-19 Mitsubishi Jukogyo Kabushiki Kaisha Schalldämpfer für Industriemotor
WO1997017531A1 (en) * 1995-11-06 1997-05-15 Tennex Europe Limited A noise attenuator for an induction system or an exhaust system
EP0897060A2 (de) * 1997-08-13 1999-02-17 Honda Giken Kogyo Kabushiki Kaisha Einlassgeräuschdämpfer

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1476491A1 (de) * 1963-06-17 1969-10-02 Cie Generale Du Duralumin Et D Auspufftopf
US4084658A (en) * 1976-11-05 1978-04-18 Custom-Bilt Tunable expansion chamber for internal combustion engines
JPS59108815A (ja) * 1982-12-14 1984-06-23 Kawasaki Heavy Ind Ltd ２サイクルエンジンの排気装置
DE3516442A1 (de) * 1985-05-08 1986-11-13 Jörg Prof. Dipl.-Ing.(FH) 7072 Heubach Linser Schalldaempfer
EP0513850A2 (de) * 1989-08-30 1992-11-19 Mitsubishi Jukogyo Kabushiki Kaisha Schalldämpfer für Industriemotor
WO1997017531A1 (en) * 1995-11-06 1997-05-15 Tennex Europe Limited A noise attenuator for an induction system or an exhaust system
EP0897060A2 (de) * 1997-08-13 1999-02-17 Honda Giken Kogyo Kabushiki Kaisha Einlassgeräuschdämpfer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 227 (M-332), 18 October 1984 (1984-10-18) & JP 59 108815 A (KAWASAKI JUKOGYO KK), 23 June 1984 (1984-06-23) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1126139A2 (de) * 2000-02-16 2001-08-22 Kabushiki Kaisha Kobe Seiko Sho Schalldämpfer aus einer Titan-Legierung
EP1126139A3 (de) * 2000-02-16 2003-07-02 Kabushiki Kaisha Kobe Seiko Sho Schalldämpfer aus einer Titan-Legierung

Also Published As

Publication number Publication date
ITLC980002A0 (it) 1998-04-03
IT1306539B1 (it) 2001-06-11
EP0947674A3 (de) 2000-01-12
ITLC980002A1 (it) 1999-10-03
ES2137913T1 (es) 2000-01-01

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