EP0355605A1 - Schalldämpfer für Auspuffanlagen - Google Patents

Schalldämpfer für Auspuffanlagen Download PDF

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Publication number
EP0355605A1
EP0355605A1 EP89114827A EP89114827A EP0355605A1 EP 0355605 A1 EP0355605 A1 EP 0355605A1 EP 89114827 A EP89114827 A EP 89114827A EP 89114827 A EP89114827 A EP 89114827A EP 0355605 A1 EP0355605 A1 EP 0355605A1
Authority
EP
European Patent Office
Prior art keywords
housing
chamber
transverse wall
inlet pipe
inflow
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Withdrawn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
EP89114827A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jaroslav Cervinka
Pavel Dipl.-Ing. Husak
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.)
Jawa NP
Original Assignee
Jawa NP
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 Jawa NP filed Critical Jawa NP
Publication of EP0355605A1 publication Critical patent/EP0355605A1/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Withdrawn legal-status Critical Current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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • 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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/06—Silencing apparatus characterised by method of silencing by using interference effect
    • 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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/084—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the exhaust gases flowing through the silencer two or more times longitudinally in opposite directions, e.g. using parallel or concentric tubes
    • 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
    • F01N2210/00—Combination of methods of silencing
    • F01N2210/02—Resonance and interference
    • 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
    • F01N2210/00—Combination of methods of silencing
    • F01N2210/04—Throttling-expansion and resonance
    • 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
    • F01N2210/00—Combination of methods of silencing
    • F01N2210/06—Throttling-expansion and interference
    • 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 exhaust gas passages, pipes or tubes
    • F01N2470/02—Tubes being perforated
    • F01N2470/04—Tubes being perforated characterised by shape, disposition or dimensions of apertures
    • 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 exhaust gas passages, pipes or tubes
    • F01N2470/08—Exhaust gas passages being formed between the walls of an outer shell and an inner chamber
    • 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 exhaust gas passages, pipes or tubes
    • F01N2470/12—Tubes being corrugated
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/15—Plurality of resonance or dead chambers
    • F01N2490/155—Plurality of resonance or dead chambers being disposed one after the other in flow direction

Definitions

  • the invention relates to a silencer for exhaust systems of the type specified in the preamble of the main claim.
  • a silencer which has two reflection chambers in a housing, in the end walls of which the inlet and outlet pipes of the exhaust gases are inserted.
  • the two reflection chambers are separated from one another by a transversely arranged flat partition, between the circumference and the inner surface of the tubular housing an intermediate channel is arranged, which leads from the first reflection chamber into the second reflection chamber and is formed by the inner surface of the housing and a corrugated sheet to form parallel channels and openings for connecting the first reflection chamber to the second reflection chamber.
  • the exhaust pipe of the exhaust gases has at least one inflow opening in the end part protruding into the second reflection chamber, this end part with the partition is firmly connected.
  • the inflow pipe has an oblique opening at its end projecting into the first reflection chamber in order to guide the exhaust gas flow in a roughly radial direction into the housing, which is provided on its casing with a larger number of openings through which the exhaust gases pass in radial and then in flow in the axial direction to the inlet openings of the intermediate channel between the first and second reflection chambers.
  • this silencer can be adapted to different requirements of different internal combustion engines.
  • the inner casing has an adverse effect on the mass of the entire silencer, and the outer casing of the silencer also has to support the mass of the inner casing.
  • a different inner housing must be manufactured for each different internal combustion engine.
  • the invention has for its object to provide a generic muffler for the exhaust pipe of an internal combustion engine, which has a more effective damping effect and reduced negative influences on the performance parameters of the internal combustion engine and at the same time has a lower mass and greater strength and durability.
  • the silencer according to the invention is provided with connecting means which lead from the inflow chamber into the outflow chamber and from the inner surface of the housing and a corrugated sheet between the circumference of the transverse or Partition and the housing are formed so that the wavy bend alternately touches the circumference of the partition and the inner surface of the tubular housing.
  • the connecting means have channels for the exhaust gases to flow through from the front end part of the inflow chamber into the rear end part of the outflow chamber, and openings which connect the two chambers directly to one another.
  • the connecting means can also be formed differently, e.g. B. by a sheet, the waves in the rolled state assume a rectangular shape, through pipes between the two partitions and the inner surface of the tubular housing u. ⁇ .
  • An important requirement is that the corrugated sheet is firmly connected at the contact surfaces with the wall of the tubular housing and with the partition on this.
  • the connecting means can be arranged over approximately the entire length of the tubular housing or only in the region of the partition between the inlet and outlet chamber.
  • the connection means in the form of a wave form a fitting against vibrations and a system of external and internal channels.
  • the partition between the inflow and outflow chamber is advantageously connected to the outlet pipe and thereby strengthens the entire construction of the silencer.
  • the unit formed by the connecting means, the partition and the outlet pipe stiffens the outer envelope of the silencer. Therefore, the entire tubular housing according to the invention can be formed from a light and thin outer jacket.
  • the exhaust gases entering the inlet pipe collide in the inflow chamber directly with the transverse or partition wall which is convex against the direction of flow. Part of the rebounding exhaust gases and the reflection pressure waves pass through the in the inflow floor around the inlet pipe arranged openings in the blind antechamber. This pre-chamber extends around the inlet pipe in front of the inflow floor outside the inflow chamber. The exhaust gases expand in this antechamber.
  • the convex shape of the partition directs the exhaust gas flow to the housing circumference and at the same time disrupts the jerkiness of the individual expansions, because the individual exhaust gas particles have a different length of path before impact with the partition and after rebound from the partition.
  • a silencer is particularly cheap for single-cylinder engines.
  • the blind antechamber advantageously has a narrowing shape, the wall of which narrows towards the inlet pipe and is firmly connected to the inlet pipe.
  • This narrowing shape and the connection of the housing of the prechamber with the inlet pipe increase the strength of the entire silencer.
  • the housing of the prechamber according to the invention is resistant to vibrations and noise emissions even when using weak material. In the manufacture, assembly and appearance of a motorcycle, it is favorable to align the inlet pipe coaxially with the outlet pipe and the entire tubular housing.
  • the cross section of the tubular housing can be circular, oval or in the form of a square with rounded corners.
  • the silencer according to the invention can be combined with an absorption silencer for more intensive silencing.
  • the muffler shown contains a tubular housing 1, which is closed at the end by an inflow floor 5 and an outflow floor 15.
  • An appropriately spherical shell-shaped transverse wall 6 towards the outlet-side bottom 15 divides the interior of the housing 1 into the inflow chamber 3 and the outflow chamber 4.
  • a corrugated sheet 10 Between the inner surface of the housing 1 and the outer edge of the transverse wall 6 there is a corrugated sheet 10, the longitudinal channels 11 between the inner surface of the housing 1 and the corrugated sheet 10 and inner openings 12 between the partition 6 and the corrugated sheet 10 forms.
  • An exhaust pipe 8 is connected to an exhaust pipe 7 and its end 20 is fixed in a central opening of the inflow base 5 and opens into the inlet chamber 3 with respect to the convex partition 6. Openings 9 in the base 5 connect the inflow chamber 3 to a closed prechamber 2 which surrounds the inflow tube 8 in front of the base 5 outside the inflow chamber 3.
  • the housing 18 of the conical prechamber 2 can be formed in one piece with the housing jacket 1 and fixed on the bent edge of the base 5. With its front narrowed end, the housing 18 is connected to the inflow tube 8.
  • a centrally arranged outlet pipe 13 extends through the Outflow chamber 4 and is attached with its end edge 14 to the inner surface of the transverse wall 6.
  • This outlet pipe 13 has longitudinal elongated holes 16 within the outflow chamber 4 and a hollow cylindrical insert 17 in the region of the outlet-side base 15.
  • the housing 1, the prechamber 2, the inlet pipe 8, the outlet pipe 13 and the partition 6 are made coaxial with the central axis 19.
  • the insert 17 in the outlet pipe serves to reinforce the damper at the location of the bottom 15.
  • the corrugated sheet 10 alternately touches the circumference of the transverse wall 6 and the inner surface of the housing 1, with which it is firmly connected.
  • Channels 11 are formed between the corrugated sheet 10 and the inner surface of the housing 1, and there are openings 12 between the corrugated sheet 10 and the circumference of the partition 6.
  • the outlet pipe 13 is provided with the openings 16 on its part which projects into the outlet chamber 4 serve to admit the exhaust gases into the outlet pipe 13.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
EP89114827A 1988-08-16 1989-08-10 Schalldämpfer für Auspuffanlagen Withdrawn EP0355605A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CS885637A CS271879B1 (en) 1988-08-16 1988-08-16 Exhaust silencer for internal combustion engines
CS5637/88 1988-08-16

Publications (1)

Publication Number Publication Date
EP0355605A1 true EP0355605A1 (de) 1990-02-28

Family

ID=5401597

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89114827A Withdrawn EP0355605A1 (de) 1988-08-16 1989-08-10 Schalldämpfer für Auspuffanlagen

Country Status (4)

Country Link
EP (1) EP0355605A1 (cs)
AU (1) AU3942389A (cs)
CS (1) CS271879B1 (cs)
DK (1) DK388289A (cs)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6776257B1 (en) * 2003-05-13 2004-08-17 Silent Exhaust Systems Ltd. Sound-attenuating muffler having reduced back pressure
FR2874233A1 (fr) * 2004-08-16 2006-02-17 Pauline Blain Systeme pour attenuer les ondes sonores contenues dans les gaz ou l'air d'evacuation des moteurs thermiques ou turbines ou materiels fonctionnant a l'air comprime
JP2011169323A (ja) * 2010-02-18 2011-09-01 J Eberspecher Gmbh & Co Kg 消音器

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR839063A (fr) * 1937-12-02 1939-03-23 Citroen Sa Andre Perfectionnements aux silencieux d'échappement
US2199164A (en) * 1938-11-17 1940-04-30 Herbert S Powell Muffler
DE736633C (de) * 1941-10-26 1943-06-23 Eberspaecher J Aus mehreren Kammern bestehender Schalldaempfer, bei dem die Gase dem Mantel des Schalldaempfers entlangstroemen, fuer Brennkraftmaschinen
US2838128A (en) * 1955-08-30 1958-06-10 Sr Edward A Kliewer Engine exhaust muffler
US2881852A (en) * 1956-06-14 1959-04-14 Gen Motors Corp Exhaust muffler means
FR2283312A1 (fr) * 1974-08-28 1976-03-26 Yamaha Motor Co Ltd Appareil et dispositif d'amortissement des bruits, notamment a l'echappement des moteurs a combustion interne
US4143739A (en) * 1977-05-09 1979-03-13 Nelson Industries, Inc. Concentric pass-type muffler construction
GB2021195A (en) * 1978-05-17 1979-11-28 Fiat Ricerche Exhaust silencer for an agricultural tractor
EP0243559A1 (fr) * 1986-04-30 1987-11-04 S.A: André Boet Société Anonyme dite: Silencieux pour courant gazeux

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR839063A (fr) * 1937-12-02 1939-03-23 Citroen Sa Andre Perfectionnements aux silencieux d'échappement
US2199164A (en) * 1938-11-17 1940-04-30 Herbert S Powell Muffler
DE736633C (de) * 1941-10-26 1943-06-23 Eberspaecher J Aus mehreren Kammern bestehender Schalldaempfer, bei dem die Gase dem Mantel des Schalldaempfers entlangstroemen, fuer Brennkraftmaschinen
US2838128A (en) * 1955-08-30 1958-06-10 Sr Edward A Kliewer Engine exhaust muffler
US2881852A (en) * 1956-06-14 1959-04-14 Gen Motors Corp Exhaust muffler means
FR2283312A1 (fr) * 1974-08-28 1976-03-26 Yamaha Motor Co Ltd Appareil et dispositif d'amortissement des bruits, notamment a l'echappement des moteurs a combustion interne
US4143739A (en) * 1977-05-09 1979-03-13 Nelson Industries, Inc. Concentric pass-type muffler construction
GB2021195A (en) * 1978-05-17 1979-11-28 Fiat Ricerche Exhaust silencer for an agricultural tractor
EP0243559A1 (fr) * 1986-04-30 1987-11-04 S.A: André Boet Société Anonyme dite: Silencieux pour courant gazeux

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6776257B1 (en) * 2003-05-13 2004-08-17 Silent Exhaust Systems Ltd. Sound-attenuating muffler having reduced back pressure
FR2874233A1 (fr) * 2004-08-16 2006-02-17 Pauline Blain Systeme pour attenuer les ondes sonores contenues dans les gaz ou l'air d'evacuation des moteurs thermiques ou turbines ou materiels fonctionnant a l'air comprime
JP2011169323A (ja) * 2010-02-18 2011-09-01 J Eberspecher Gmbh & Co Kg 消音器

Also Published As

Publication number Publication date
CS271879B1 (en) 1990-12-13
CS563788A1 (en) 1990-03-14
DK388289A (da) 1990-02-17
DK388289D0 (da) 1989-08-08
AU3942389A (en) 1990-02-22

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