EP0074220A2 - Einsatz in Geräuschdämpfern - Google Patents

Einsatz in Geräuschdämpfern Download PDF

Info

Publication number
EP0074220A2
EP0074220A2 EP82304500A EP82304500A EP0074220A2 EP 0074220 A2 EP0074220 A2 EP 0074220A2 EP 82304500 A EP82304500 A EP 82304500A EP 82304500 A EP82304500 A EP 82304500A EP 0074220 A2 EP0074220 A2 EP 0074220A2
Authority
EP
European Patent Office
Prior art keywords
insert
former
fibrous material
around
fibres
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Withdrawn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
EP82304500A
Other languages
English (en)
French (fr)
Other versions
EP0074220A3 (de
Inventor
Timothy Clokey
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.)
Lancaster Glass Fibre Ltd
Original Assignee
Lancaster Glass Fibre 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 Lancaster Glass Fibre Ltd filed Critical Lancaster Glass Fibre Ltd
Publication of EP0074220A2 publication Critical patent/EP0074220A2/de
Publication of EP0074220A3 publication Critical patent/EP0074220A3/de
Withdrawn legal-status Critical Current

Links

Images

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
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4209—Inorganic fibres
    • D04H1/4218—Glass fibres
    • 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

  • This invention relates to inserts for use in silencers of the type used in silencing the exhaust gases of internal combustion engines.
  • silencers comprise a silencer box having a perforated pipe extending therethrough and it is usual to provide a packing of fibrous material in the space between the internal surface of the silencer box and the external surface of the perforated pipe.
  • the fibrous material can be packed by hand into the silencer box through an open end thereof to fill the space between the internal surface of the silencer box and the external surface of the perforated pipe.
  • manual packing is a time consuming and therefore expensive operation and it is also difficult to control the density of the fibrous packing.
  • the density of the packing has an important effect on the efficiency of the silencer as the packing must not be so tightly compacted that the fibres are unable to move which reduces the sound deadening effect thereof but on the other hand the packing must not be so loose as to allow the fibres to escape through the perforations in the pipe.
  • the silencer packing is known to produce as a pre-formed rigid insert in which the fibrous material is formed into a shape which will fit readily into the space in the silencer box surrounding the perforated pipe, and the material is treated with adhesive so as to cause the fibres to adhere together and sustain the preformed shape during the handling required to fit the insert in the silencer box.
  • rigid inserts reduces the cost of manufacture of the silencer and makes it easier to ensure that the material is of a suitable and consistent density
  • the known inserts have been produced from material formed wholly or mainly of glass fibres which is relatively expensive and the object of this invention is to provide a less expensive insert.
  • an insert for a silencer of an internal combustion engine comprises a central portion constituting a former; an outer portion surrounding the former formed of a fibrous material, the fibres of which are heat resistant fibres; and comprises an outer covering of material adapted to retain the fibrous material of the outer portion in position relatively to the former.
  • the former is formed of a high porosity, heat resistant material which is capable of retaining its shape.
  • the former material glass fibres in whole or in part secured together by adhesive to form a rigid-member, and the glass fibres may be E glass fibres.
  • E glass is a known type of glass manufactured in the United Kingdom by Turner Newall Limited and Fibreglass Limited and the significant characteristic of this glass for the purposes of the present invention is that it will withstand temperatures of up to 750 0 C so that it can be used in silencers of internal combustion engines and can be used to form a heat resistant and highly porous former.
  • the former is, preferably, of a hollow cylindrical shape and may be arranged to remain in situ when the insert is placed in a silencer box with the former sliding over a perforated pipe secured in the silencer box:
  • a method of forming an insert to said one aspect of the invention comprises placing a length of fibrous material loosely around the former, placing the fibrous material and the former into a loop of an endless belt which extends over two spaced-apart rollers and depends therebeneath, moving the rollers into close relationship and applying tension to the belt to decrease the length of the loop of the endless belt to apply pressure to the fibrous material disposed around the former, rotating the endless belt to roll and compress the fibrous material around the former,and applying an outer covering to wrap the rolled insert so as to retain the shape thereof.
  • the outer covering is wrapped around the rolled insert during the final stages of the rolling operation by inserting the edge of the covering between the belt and the rolled insert and rotating the insert to wrap the covering completely around the periphery of the insert.
  • the length of fibrous material is cut from a mat thereof and the cut length of material is weighed so as to control the density of the fibrous material in the insert.
  • the insert is, preferably, cut to a desired length according to the length of silencer box into which the insert is to be inserted and a plurality of inserts may be cut from a length of rolled insert where the finished insert is to be of a relatively short length.
  • the former may be produced by moulding a mixture of glass fibres and adhesive around a mandrel, curing the adhesive and removing the mandrel prior to placing the fibrous material therearound.
  • the fibrous material may be mixed with an adhesive binder prior to placing the fibrous material around the former and after completion of the method according to said other aspect of this invention, the cut lengths of the insert are placed in a mould and cured by applying heat thereto.
  • the insert is cut along the centre line thereof to enable the insert to be assembled around the perforated pipe in a silencer box by bringing the two halves of the insert together instead of sliding the insert longitudinally over the perforated pipe.
  • an insert indicated generally at 10 of substantially circular cross-section is formed by cutting a length of fibrous material 12, for example mineral fibres such as basalt fibres, from a loose mat of such fibres.
  • Basalt fibres are capable of withstanding heat and are relatively long staple fibres but it has been found to be difficult to manually form a mat of such fibres into a desired shape to constitute an insert suitable for inserting into a silencer box (not shown) of a conventional internal combustion engine exhaust gas silencer.
  • the loose mat of basalt fibres is ⁇ conveniently some six feet in width and the length of mat which is cut is dependent upon the diameter of insert 10 which is to be formed.
  • the length of mat controls the density of the basalt, fibres in the completed insert 10 and an accurate method of controlling this density is to weigh the cut length of mat.
  • the weight of mat required is determined on an empirical basis according to the diameter of the completed insert and the number of inserts to be formed from the length of the rolled mat.
  • the former 14 can be a cardboard tube or, alternatively, a rigid cylinder of glass fibres. Where the former 14 is to be discarded when the insert 10 is placed in the silencer box, the cardboard tube is arranged to be of substantially the same diameter as the conventional perforated pipe in the silencer box.
  • the end of the perforated pipe engages the former 14 and ejects it from the insert 10 as the insert is inserted into the silencer box.
  • the internal diameter of the former 14 is arranged to be a close sliding fit on the perforated pipe in the silencer box.
  • the former 14 is formed from glass fibres, such as "E" glass fibres, mixed with an adhesive binder such as phenol.
  • the glass fibres and adhesive binder are moulded in conventional manner around a mandrel and the adhesive is cured. After curing the mandrel is removed and the former 14 of a rigid cylindrical shape of heat resistant glass fibres and having a high porosity is ready for use in the method of forming the insert 10.
  • the mat of basalt fibres wrapped around the former 14 is then placed in a rolling machine 16.
  • the machine 16 comprises two spaced-apart main rollers 18 and 20, the roller 18 being mounted in a fixed position on a frame 22 of the machine and provided with a handle 24 to effect rotation thereof whereas the position of the roller 20 is adjustable to vary the spacing between the two main rollers.
  • the roller 20 In the operative position, the roller 20 is disposed adjacent to the roller 18 but spaced-apart therefrom and in the inoperative or loading position shown in broken lines, the distance between the rollers 18 and 20 is arranged to be greater than the maximum diameter of the mat of basalt fibres loosely wrapped around the former 14.
  • Two parallel spaced-apart tension rollers 26 and 28 are mounted on a sub frame 30 which is pivotally connected to the frame 22 for pivotal movement relatively thereto about an axis which is parallel to the rotational axes of the rollers 18, 20, 26 and 28.
  • An endless belt 32 extends around the rollers 18, 20, 26 and 28 and is of such a length that a loop 34 depends below the rollers 18 and 20 when said rollers are in their operative position.
  • the position of the roller 28 is adjustable in the direction of the arrow A to vary the length of the loop 34 and an additional idler roller 26 is also provided whose position is also adjustable in the direction of the arrow B to provide additional adjustment of the length of the loop 34.
  • the position of the sub frame 30 in its operative position is adjustable by means of a screw mechanism 38 which carries a spring-loaded manually releasable catch for retaining the sub frame 30 in said operative position and here again this adjustment enables the length of the loop 34 to be varied.
  • a screw mechanism 38 which carries a spring-loaded manually releasable catch for retaining the sub frame 30 in said operative position and here again this adjustment enables the length of the loop 34 to be varied.
  • the upper surface of the frame 22 of the machine 16 has a cutting table mounted thereon which extends parallel to the roller 18 and a sliding carriage assembly 42 carrying a roll 44 of plastics sheet or film 46 such as, for example, self adhering plastics film is also mounted thereon.
  • a scrim of plastics material can be utilised instead of a sheet or film.
  • the carriage assembly 42 is slidable along the length of the machine 16 to enable the plastics film to be applied to the whole length of the insert 10.
  • the roller 20 is moved to the inoperative or loading position and the sub frame 30 is released and moves under the action of a counter balance weight 46 to an upper loading position indicated in broken lines.
  • the mat of basalt fibres loosely wrapped around the former 14 is placed in the loop 34 of the endless belt 32 and the roller 20 is moved to the operative position.
  • the sub frame 30 with the rollers 26 and 28 mounted therein is pivoted downwardly to the operative position where it is retained by the spring loaded catch thus applying tension to the loop 34 of the belt 32.
  • the roller 18 is rotated by the handle 24 which causes the basalt fibres to be rolled to the desired diameter around the former 14.
  • the plastic film 46 is then drawn from the roll 44 and the free edge is placed between the belt 32 and the basalt fibres of the insert 10.
  • The. roller 18 is again rotated until the basalt fibres are completely wrapped therein. whereupon the film is cut by running a knife along the cutting table 40. The excess film is then wrapped around the insert 10 by rotating the roller 18.
  • the insert 10 is then removed from the machine 16 by releasing the sub frame 30 and moving the roller 20 to its inoperative position and the film retains the basalt fibres around the former 14.
  • the insert 10 is then cut into one or more desired lengths depending upon the type of silencer box into which the insert is to be fitted.
  • the basalt fibres are mixed with or have an adhesive binder applied thereto.
  • the mat of basalt fibres and adhesive binder are rolled around the former 14 in the above described manner.
  • each insert is placed in a mould and heat is applied to cure the adhesive binder.
  • the insert is then cut along its centre into two mating halves which can then be assembled around the perforated pipe in a silencer box by bringing the two halves of the insert together.
  • This type of insert is suitable for utilisation in a silencer box which is assembled in two halves. It will be appreciated that if a cardboard former is used it will have to be removed from the insert before the insert is installed in the silencer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Textile Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
EP82304500A 1981-08-26 1982-08-26 Einsatz in Geräuschdämpfern Withdrawn EP0074220A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8126003 1981-08-26
GB8126003 1981-08-26

Publications (2)

Publication Number Publication Date
EP0074220A2 true EP0074220A2 (de) 1983-03-16
EP0074220A3 EP0074220A3 (de) 1984-05-16

Family

ID=10524171

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82304500A Withdrawn EP0074220A3 (de) 1981-08-26 1982-08-26 Einsatz in Geräuschdämpfern

Country Status (2)

Country Link
EP (1) EP0074220A3 (de)
GB (1) GB2106591B (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU599686B2 (en) * 1986-08-08 1990-07-26 Tennessee Gas Pipeline Company Acoustic muffler
EP0434895A1 (de) * 1989-12-09 1991-07-03 Walker Uk Limited Schalldämpfer und Verfahren zu dessen Herstellung
WO1991019081A1 (en) * 1990-05-26 1991-12-12 Fibre Techniques Limited Catalytic converters
GB2267731A (en) * 1992-06-10 1993-12-15 Lancaster Glass Fibre Sound absorber insert for an exhaust silencer.
EP0957240A1 (de) * 1998-05-14 1999-11-17 Scambia Industrial Developments Aktiengesellschaft Verfahren und Anlage zur Einführung von Faserstoff in ein Gehäuse, und nach diesem Verfahren hergestelltes Gehäuse
WO2000042301A1 (de) * 1999-01-14 2000-07-20 Zeuna-Stärker GmbH & Co. KG Verfahren und vorrichtung zur herstellung eines absorptionsschalldämpfers
EP1217184A1 (de) * 2000-12-14 2002-06-26 Nakagawa Sangyo Co., Ltd. Schallschluckendes Material, Schalldämpfer mit diesem schallschluckenden Material, und Verfahren zur Formung einer schallschluckenden Schicht hierfür
US6467571B2 (en) 2000-12-11 2002-10-22 Nakagawa Sangyo Co., Ltd. Sound absorbing material, muffler using the sound absorbing material, and method for forming sound absorbing layer thereof
WO2006095373A1 (en) * 2005-03-10 2006-09-14 Vale S.R.L. Small mattress-like glass fibre structure and method for its manufacture

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB447376A (en) * 1935-12-09 1936-05-18 Norman Hasting Servais Improvements in and relating to silencers for gaseous currents and the method of producing same
US2471595A (en) * 1946-05-27 1949-05-31 Albert R White Machine and method of making oil filter packs
US2583366A (en) * 1948-02-09 1952-01-22 Willard H Engels Muffler with perforated cylinder containing inwardly and rearwardly inclined holes
GB704329A (en) * 1950-08-29 1954-02-17 Lathom Engineering Company Ltd Improvements in silencers for gaseous currents
US2834425A (en) * 1954-04-02 1958-05-13 Grand Sheet Metal Products Co Exhaust muffler
DE1031055B (de) * 1955-09-06 1958-05-29 Eberspaecher J Behaelter mit Schallschluckstoffuellung und Fuehrungskanal fuer pulsierende Gasstroemung, insbesondere Schalldaempfer fuer Brennkraftmaschinen
FR1461528A (fr) * 1965-10-11 1966-02-25 Francisol Procédé de fabrication de produits conformés en laine minérale ou autres fibres et machines pour la mise en oeuvre de ce procédé
GB1503644A (en) * 1975-04-21 1978-03-15 Fogarty & Co Ltd E Method and apparatus for forming fibrous cylindrical element
DE2649979A1 (de) * 1976-10-30 1978-05-03 Klaus Metzger Auspuffschalldaempfer
JPS5428952A (en) * 1977-08-09 1979-03-03 Toyota Motor Corp Silencer for internal combustion engine
GB2065596B (en) * 1979-12-18 1983-10-05 Lancaster Glass Fibre Ltd Rigid inserts for silencers

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU599686B2 (en) * 1986-08-08 1990-07-26 Tennessee Gas Pipeline Company Acoustic muffler
EP0434895A1 (de) * 1989-12-09 1991-07-03 Walker Uk Limited Schalldämpfer und Verfahren zu dessen Herstellung
WO1991019081A1 (en) * 1990-05-26 1991-12-12 Fibre Techniques Limited Catalytic converters
GB2267731A (en) * 1992-06-10 1993-12-15 Lancaster Glass Fibre Sound absorber insert for an exhaust silencer.
EP0957240A1 (de) * 1998-05-14 1999-11-17 Scambia Industrial Developments Aktiengesellschaft Verfahren und Anlage zur Einführung von Faserstoff in ein Gehäuse, und nach diesem Verfahren hergestelltes Gehäuse
WO2000042301A1 (de) * 1999-01-14 2000-07-20 Zeuna-Stärker GmbH & Co. KG Verfahren und vorrichtung zur herstellung eines absorptionsschalldämpfers
US6588105B1 (en) 1999-01-14 2003-07-08 Zeuna-Straerker Gmbh & Co. Kg Method and device for producing an absorption silencer
US6467571B2 (en) 2000-12-11 2002-10-22 Nakagawa Sangyo Co., Ltd. Sound absorbing material, muffler using the sound absorbing material, and method for forming sound absorbing layer thereof
EP1217184A1 (de) * 2000-12-14 2002-06-26 Nakagawa Sangyo Co., Ltd. Schallschluckendes Material, Schalldämpfer mit diesem schallschluckenden Material, und Verfahren zur Formung einer schallschluckenden Schicht hierfür
WO2006095373A1 (en) * 2005-03-10 2006-09-14 Vale S.R.L. Small mattress-like glass fibre structure and method for its manufacture

Also Published As

Publication number Publication date
GB2106591B (en) 1985-09-11
EP0074220A3 (de) 1984-05-16
GB2106591A (en) 1983-04-13

Similar Documents

Publication Publication Date Title
EP0074220A2 (de) Einsatz in Geräuschdämpfern
KR930000401B1 (ko) 조립된 지지 리브를 갖는 저장 탱크 및 그 제조 방법
US4115498A (en) Method and apparatus for molding articles from fibrous material
US3497413A (en) Apparatus for making a tubular body of fibrous glass
US3642034A (en) Tubular fibrous bodies and apparatus and method for their production
FI69507C (fi) Saett och anordning foer tillverkning av formstycken av mineralull
US2997739A (en) Binder curing of fibrous masses
US6196351B1 (en) Silencer cartridge
EP1319823A2 (de) Methode zur Herstellung eines isolierten Raketengehäuses und entsprechendes Raketenghäuse
US4248110A (en) Apparatus for and method of cutting a belt sleeve
FI78970C (fi) Formdel av bindemedelsfoersedda mineralfibrer foer ljuddaempande beklaedning av ett perforerat avgasroer och foerfarande foer framstaellning av denna.
JP2011088363A (ja) 複合材ファンバイパスダクト及びその他の同様な構成要素を製作するための螺旋ワインディングシステム
US5597431A (en) Device and method for the series production of fiber reinforced resin parts
EP1861592B1 (de) Kleine matratzenartige glasfaserstruktur und herstellungsverfahren dafür
RU2265091C2 (ru) Способ изготовления панели из минерального волокна, содержащей одну или несколько полостей определенной формы
JPH0719021A (ja) 消音器、その製造方法および製造装置
US3886016A (en) Method and apparatus for making a reinforced wall
JP3877545B2 (ja) 異形断面管の製造方法及びその製造装置
US3080606A (en) Apparatus for curing a cylindrical fiber glass and binder casing
GB2065596A (en) Improvements in or relating to rigid inserts for silencers
JPS6155460B2 (de)
JPH09239850A (ja) 強化樹脂管の製造方法
FI77103C (fi) Saett att utvaendigt isolera roer och roerdetaljer.
KR910016415A (ko) 금속 주형 공정용 노즐 성형방법과 성형된 노즐
JPS6159225B2 (de)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR IT LI LU NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): AT BE CH DE FR IT LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19850116

RIN1 Information on inventor provided before grant (corrected)

Inventor name: CLOKEY, TIMOTHY