EP1217184B1 - Matériau absorbant acoustique, silencieux employant ce matériau absorbant acoustique, et procédé de formation d'un couche absorbante pour le silencieux - Google Patents

Matériau absorbant acoustique, silencieux employant ce matériau absorbant acoustique, et procédé de formation d'un couche absorbante pour le silencieux Download PDF

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Publication number
EP1217184B1
EP1217184B1 EP00127435A EP00127435A EP1217184B1 EP 1217184 B1 EP1217184 B1 EP 1217184B1 EP 00127435 A EP00127435 A EP 00127435A EP 00127435 A EP00127435 A EP 00127435A EP 1217184 B1 EP1217184 B1 EP 1217184B1
Authority
EP
European Patent Office
Prior art keywords
sound absorbing
absorbing material
perforated pipe
fibrillated
muffler
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 - Lifetime
Application number
EP00127435A
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German (de)
English (en)
Other versions
EP1217184A1 (fr
Inventor
Yukihiro Nakagawa
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.)
Nakagawa Sangyo Co Ltd
Toyota Motor Corp
Original Assignee
Nakagawa Sangyo Co Ltd
Toyota Motor Corp
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 Nakagawa Sangyo Co Ltd, Toyota Motor Corp filed Critical Nakagawa Sangyo Co Ltd
Priority to EP00127435A priority Critical patent/EP1217184B1/fr
Priority to DE2000603201 priority patent/DE60003201T2/de
Publication of EP1217184A1 publication Critical patent/EP1217184A1/fr
Application granted granted Critical
Publication of EP1217184B1 publication Critical patent/EP1217184B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing 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
    • 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
    • F01N2450/06—Inserting sound absorbing material into a chamber

Definitions

  • the present invention relates to a muffler using a sound absorbing material, and a method for forming a sound absorbing layer of the muffler.
  • a muffler aiming at sound reduction of exhaust gas is arranged in an exhaust system of an internal combustion engine of an automobile.
  • a muffler uses a sound absorbing material for preventing high frequency sound, and that sound absorbing material is mainly made of glass fiber.
  • a sub muffler and a pre muffler are arranged on the downstream side of an exhaust emission purifier using a catalyst, and a main muffler is arranged on the downmost stream side.
  • a sub muffler and a pre muffler may be positioned at a short distance from the exhaust emission purifier, and, in such a case, a high temperature of the exhaust gas or large pulsation may influence on the sub muffler or the pre muffler.
  • stainless wool is wound around a porous exhaust tube of the sub muffler or the pre muffler and a sound absorbing material such as glass fiber is wound around the outer periphery thereof or internally filled.
  • the glass fiber used as a sound absorbing material accomplishes the quality which can withstand use in various temperature ranges, the resistance property with respect to acid things or alkaline things included in the exhaust gas is insufficient.
  • the glass fiber may be, therefore, degraded/broken and emitted into the air together with the exhaust gas.
  • the document EP 0 153 100 A1 discloses a method for forming an exhaust silencer, wherein a plurality of continuous basalt fibers are twisted to form strands which are bundled to a roving. These fibers are additionally fluffed-up to form a roll-like material.
  • the reference US 6,094,817 shows a method for filling a silencer with sound insulating material consisting of continuous texturized basalt.
  • the texturizing takes place in connection with the filling method using a nozzle through which the insulating material is blown into the silencer. Additionally, during the filling process the silencer is rotated by a motor.
  • an object of the present invention is to provide a muffler using a sound absorbing material which is superior in acid resistance, alkali resistance and sound absorbing qualities, and a method for forming a sound absorbing layer of the muffler.
  • the bundled material in the step for forming the fibrillated sound absorbing material, may be supplied in a nozzle, compressed air may be blown into the nozzle and the bundled material may be unraveled by this compressed air to continuously form the fibrillated sound absorbing material by using the nozzle.
  • the sound absorbing material in the step for arranging the fibrillated sound absorbing material on the outer peripheral portion of the perforated pipe, may be supplied on the outer periphery of the perforated pipe while rotating the perforated pipe around its axis so that the sound absorbing material is wound around the perforated pipe.
  • the sound absorbing material when supplying the fibrillated sound absorbing material on the outer peripheral portion of the perforated pipe, the sound absorbing material may be supplied to the perforated pipe while giving tension to the sound absorbing material by a tension roller.
  • basalt which is a natural mineral substance is dissolved to be continuous fibrous basalt yarn, and a fiber bundling agent is added to a bundle of multiple pieces of the basalt yarn 1a to obtain a long bundled material 1 as shown in Fig. 1A, and the bundled material 1 is bulked to obtain a fiber bundle type sound absorbing material 2 as shown in Fig. 1B.
  • a fiber diameter of one piece of the continuous fiber basalt yarn 1a can be set to any desired value, the diameter of 9 ⁇ to 24 ⁇ is ideal. Further, although a number of pieces of the basalt yarn 1a used in the bundled material 1 can be set to any desired value, 1000 to 4000 pieces are used for example.
  • the bundled material 1 is supplied into a nozzle 31 by a feed roller 32 and a pinch roller 33 and compressed air is blown into the nozzle 31, as shown in Fig. 2.
  • the bundled material 1 is unraveled into filaments to be continuously fed by the nozzle 31, thereby continuously manufacturing the sound absorbing material 2 fibrillated into a bulky state.
  • the sound absorbing material 2 is wound around a perforated pipe of the muffler.
  • the sound absorbing material 2 continuously formed into a long shape is stocked in a stocker 3 as shown in Fig. 1C.
  • a bundle of the sound absorbing material 2 is in the fibrillated state and stocked in a sizable amount.
  • the sound absorbing material 2 stocked in the stocker 3 is drawn from the stocker 3 and wound around the outer peripheral surface of a perforated pipe constituting a muffler, e.g., an inner pipe 4 as shown in Fig. 1D.
  • Small holes 5 are formed in the inner pipe 4, and the sound absorbing material 2 is wound in an area where the small holes 5 are formed.
  • the sound absorbing material 2 is reciprocated in the axial direction of the inner pipe 4 by a traverse mechanism and the like while rotating the inner pipe 4 around an axis thereof by appropriate rotating means so that the sound absorbing material is wound.
  • a winding amount of the sound absorbing material is set to a desired value, and the sound absorbing material 2 is wound once or multiple times in accordance with a reciprocation amount of a bundle of the sound absorbing material 2.
  • a bundle of the sound absorbing material 2 may be wound as described above but two, three or multiple bundles of the sound absorbing material 2 may be simultaneously wound according to productivity.
  • Fig. 1E shows the state where the sound absorbing material 2 is wound as described above, and this winding forms a sound absorbing layer 6 of the bulky basalt yarn.
  • the sound absorbing material 2 is pulled out from the stocker 3 by supply rollers 7 and 8 and the drawn sound absorbing material 2 is inserted between tension rollers 9 and 10 so that the end of the sound absorbing material 2 is supplied to and wound around the inner pipe 4, for example, as shown in Fig. 3.
  • the tension adjustment of the tension rollers 9 and 19 can control the density and the weight of the sound absorbing material 2 to be wound around the inner pipe 4.
  • the tension rollers 9 and 10 may not be used according to the density required for the sound absorbing layer 6. That is, only the friction of the sound absorbing material 2 and a member for supplying the sound absorbing material 2 may be used.
  • the inner pipe 4 on which the sound absorbing layer 6 is formed is inserted into an outer pipe 13 having at one end an end plate 12 in which an inner pipe insertion hole 11 is formed, from an opening at the other end thereof as shown in Fig. 1 F.
  • the sound absorbing layer 6 has the external diameter which can be fully fitted to the inner surface of the outer pipe 13.
  • the present invention can be similarly applied in a case of providing the above mentioned sound absorbing layer 6 on any other perforated pipe, e.g., a perforated portion of an outlet pipe and the like.
  • insertion holes 22 may be formed to the end plate 21 of the outer pipe 20 constituting the muffler and the sound absorbing material 2 may be inserted into and filling in a space 24 between the outer pipe 20 and the perforated pipe 23 from the insertion holes 22, thereby forming the sound absorbing layer by the sound absorbing material 2.
  • the sound absorbing material 2 may be wound around the outer periphery of the stainless wool 30 to form the sound absorbing layer 6.
  • the sound absorbing material 2 is obtained by bundling multiple pieces of the basalt yarn 1a and making the bundled material bulky to be a fiber bundle, and the method for winding this sound absorbing material 2 is similar to the above.
  • the sound absorbing material according to the first aspect of the present invention is constituted by the basalt yarn obtained by dissolving the basalt to be the continuous fiber, it can not be absorbed into the perforated pipe by an exhaust flow to be emitted into the air like the discontinuous short fiber. Further, the sound absorbing material is superior in acid resistance and alkali resistance and can not be degraded and broken by an acid substance or an alkali substance in the exhaust air to be emitted into the air like the glass wool in the related art. In addition, since the basalt yarn is bundled and the bundled material is fibrillated to be bulky, the sound absorbing property can be improved.
  • the muffler having the above-described effect can be obtained.
  • the sound absorbing layer having the effect using the basalt yarn mentioned above can be formed. Further, since the sound absorbing material consisting of the fiber bundle obtained by making multiple pieces of the basalt yarn bulky is provided on the outer periphery of the perforated pipe to form the sound absorbing layer, the density of the entire sound absorbing layer can be more equalized than that obtained by filling the discontinuous short fiber in the muffler in the related art, thereby improving the sound absorbing performance.
  • the bundled material is supplied into the nozzle while blowing the compressed air into the nozzle, and the bundled material is unraveled by the compressed air to form the continuously fibrillated sound absorbing material from the nozzle, thereby readily and continuously performing the above fibrillation.
  • the step for arranging the fibrillated sound absorbing material on the outer peripheral portion of the perforated pipe can facilitate winding the sound absorbing material around the perforated pipe by supplying the sound absorbing material to the outer periphery of the perforated pipe while rotating the perforated pipe around the axis thereof and winding the sound absorbing material around the perforated pipe.
  • the sound absorbing material When supplying the fibrillated sound absorbing material to the outer peripheral portion of the perforated pipe, the sound absorbing material can be supplied to the perforated pipe while applying tension to the sound absorbing material by the tension roller so that the tension can be adjusted during supply of the sound absorbing material, which can readily adjust the density of the sound absorbing layer to be formed.
  • the fourth aspect according to the present invention even if the sound absorbing material is inserted and filled into the muffler, the same effect as the third aspect can be obtained.
  • multiple pieces of basalt yarn (la) obtained by dissolving basalt to be continuous fibers are bundled by a fiber bundling agent to acquire a bundled material (1), and the bundled material (1) is fibrillated to obtain a bulky sound absorbing material (2).
  • the sound absorbing material (2) is arranged on the outer periphery of a perforated pipe (4) constituting a muffler to form a sound absorbing layer (6).

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

Claims (8)

  1. Un silencieux composé d'un tube perforé (4, 23) et d'un matériau acoustique (2), fibrillé, absorbant, continu, volumineux, fabriqué en continu, ledit matériau acoustique (2) fibrillé absorbant étant enroulé autour d'une partie périphérique extérieure dudit tube perforé (4, 3) et comprenant un grand nombre d'éléments en fil basaltique (la) obtenus par dissolution de basalte sous forme de fibres continues, mises en faisceaux au moyen d'un agent de mise en faisceaux de fibres pour former un matériau formé de faisceaux (1) et qui est fibrillé pour le rendre volumineux.
  2. Un procédé de fabrication d'un silencieux, comprenant les opérations suivantes :
    mise en faisceaux d'un grand nombre d'éléments en fil basaltique (la) obtenu par dissolution de basalte, transformés en fibres continues au moyen d'un agent de mise en faisceaux pour obtenir un matériau formé de faisceaux (1) ;
    fibrillation dudit matériau formé de faisceaux (1) pour le rendre volumineux et pour obtenir un matériau fibrillé absorbant acoustique (2) produit en continu ; et
    enroulement en continu dudit matériau absorbant acoustique (2) autour d'une partie périphérique d'un tube perforé (4, 23) d'un silencieux pour obtenir une couche absorbeuse de son (6) sur ledit tube perforé (4, 23).
  3. Le procédé de fabrication d'un silencieux selon la revendication 2, dans lequel, au cours de l'opération de formage dudit matériau fibrillé absorbant acoustique (2), ledit matériau formé de faisceaux (1) est introduit dans un empileur (3) pendant que l'on insuffle de l'air comprimé dans ledit empileur (3) et ledit matériau formé de faisceaux (1) est effiloché par ledit air comprimé pour former ledit matériau fibrillé continu absorbant acoustique (2) à partir dudit empileur (3).
  4. Le procédé de fabrication d'un silencieux selon l'une des revendications 2 ou 3, dans lequel, au cours de l'opération d'enroulement dudit matériau fibrillé absorbant acoustique (2) sur ladite surface périphérique dudit tuyau perforé (4), ledit matériau absorbant acoustique est acheminé sur ladite partie périphérique dudit tube perforé (4) pendant la rotation dudit tube perforé (4) autour de son axe et ledit matériau absorbant acoustique (2) est enroulé autour de ladite partie périphérique dudit tube perforé (4).
  5. Le procédé de fabrication d'un silencieux selon la revendication 4, dans lequel, au cours de l'opération d'enroulement dudit matériau fibrillé absorbant acoustique (2) sur ladite surface périphérique dudit tuyau perforé (4), ledit matériau absorbant acoustique (2) est acheminé sur le dit tube perforé (4), un rouleau tendeur (9, 10) exerçant une tension autour du matériau absorbant acoustique (2).
  6. Le silencieux selon la revendication 1 dans lequel une couche de laine d'acier inoxydable est d'abord placée autour de ladite surface périphérique extérieure (4, 23) ledit matériau fibrillé absorbant acoustique (2) étant ensuite enroulé sur la partie périphérique extérieure de la couche de laine d'acier inoxydable.
  7. Le silencieux selon la revendication 1 ou 6, dans lequel le matériau fibrillé absorbant acoustique (2) est enroulé sur la partie périphérique extérieure du tube perforé, une tension étant simultanément exercée sur ledit matériau absorbant acoustique (2).
  8. Le procédé de fabrication d'un silencieux selon l'une des revendications 2 à 5, dans lequel, avant l'enroulement du matériau fibrillé absorbant acoustique sur la partie périphérique extérieure du tube perforé, est introduite l'opération consistant à appliquer une couche de laine d'acier inoxydable sur la partie périphérique extérieure du tube perforé.
EP00127435A 2000-12-14 2000-12-14 Matériau absorbant acoustique, silencieux employant ce matériau absorbant acoustique, et procédé de formation d'un couche absorbante pour le silencieux Expired - Lifetime EP1217184B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP00127435A EP1217184B1 (fr) 2000-12-14 2000-12-14 Matériau absorbant acoustique, silencieux employant ce matériau absorbant acoustique, et procédé de formation d'un couche absorbante pour le silencieux
DE2000603201 DE60003201T2 (de) 2000-12-14 2000-12-14 Schallschluckendes Material, Schalldämpfer mit diesem schallschluckenden Material, und Verfahren zur Formung einer schallschluckenden Schicht hierfür

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP00127435A EP1217184B1 (fr) 2000-12-14 2000-12-14 Matériau absorbant acoustique, silencieux employant ce matériau absorbant acoustique, et procédé de formation d'un couche absorbante pour le silencieux

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EP1217184A1 EP1217184A1 (fr) 2002-06-26
EP1217184B1 true EP1217184B1 (fr) 2003-06-04

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EP00127435A Expired - Lifetime EP1217184B1 (fr) 2000-12-14 2000-12-14 Matériau absorbant acoustique, silencieux employant ce matériau absorbant acoustique, et procédé de formation d'un couche absorbante pour le silencieux

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EP (1) EP1217184B1 (fr)
DE (1) DE60003201T2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101313130B (zh) * 2005-11-24 2010-06-16 丰田自动车株式会社 次消声器

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011012202B4 (de) * 2011-02-23 2014-09-25 Dbw Holding Gmbh Schalldämpfereinsatz für Kraftfahrzeuge und Verfahren zur Herstellung hiervon
DE102011012156A1 (de) * 2011-02-23 2012-08-23 Dbw Holding Gmbh Verfahren zur Herstellung eines Formmatrials aus Fasermaterialien und Vorrichtung hierüber
CN115714064B (zh) * 2022-12-28 2023-06-02 江西国翔电力设备有限公司 一种抗噪安全干式变压器

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5926954A (en) * 1997-09-10 1999-07-27 Acoust-A-Fiber Research & Development, Inc. Method of making a silencer

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Publication number Priority date Publication date Assignee Title
GB2106591B (en) * 1981-08-26 1985-09-11 Lancaster Glass Fibre Fibrous insert for an i c engine exhaust silencer
SE445942B (sv) * 1982-04-06 1986-07-28 Volvo Ab Ljuddempare samt sett och anordning for framstellning av denna
EP0146249B1 (fr) * 1983-11-18 1989-01-18 TBA Industrial Products Limited Produits en fibres de verre
GB2162577B (en) * 1984-02-14 1987-07-01 Unipart Group Ltd Method of and apparatus for packing exhaust silencer casings
DE9419022U1 (de) * 1994-11-26 1995-01-26 Fa. J. Eberspächer, 73730 Esslingen Resonator-Schalldämpfer
DE19627079A1 (de) * 1996-07-05 1998-01-08 Eberspaecher J Gmbh & Co Absorptions-/Reflexions-Schalldämpfer
US6319444B1 (en) * 1996-12-02 2001-11-20 Owens Corning Fiberglas Technology, Inc. Molded insulation products and their manufacture using continuous-filament wool
US6094817A (en) * 1998-10-15 2000-08-01 Acoust-A-Fiber Research And Development, Inc. Method for filling a silencer with sound insulating material

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5926954A (en) * 1997-09-10 1999-07-27 Acoust-A-Fiber Research & Development, Inc. Method of making a silencer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101313130B (zh) * 2005-11-24 2010-06-16 丰田自动车株式会社 次消声器

Also Published As

Publication number Publication date
DE60003201T2 (de) 2003-12-18
DE60003201D1 (de) 2003-07-10
EP1217184A1 (fr) 2002-06-26

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