JPH0430900B2 - - Google Patents

Info

Publication number
JPH0430900B2
JPH0430900B2 JP59205073A JP20507384A JPH0430900B2 JP H0430900 B2 JPH0430900 B2 JP H0430900B2 JP 59205073 A JP59205073 A JP 59205073A JP 20507384 A JP20507384 A JP 20507384A JP H0430900 B2 JPH0430900 B2 JP H0430900B2
Authority
JP
Japan
Prior art keywords
pipe
parison
nozzle
air
air flow
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
Application number
JP59205073A
Other languages
Japanese (ja)
Other versions
JPS6183020A (en
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 filed Critical
Priority to JP59205073A priority Critical patent/JPS6183020A/en
Publication of JPS6183020A publication Critical patent/JPS6183020A/en
Publication of JPH0430900B2 publication Critical patent/JPH0430900B2/ja
Granted legal-status Critical Current

Links

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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
    • 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
    • F01N1/003—Silencing apparatus characterised by method of silencing by using dead chambers communicating with exhaust gas flow passages
    • F01N1/006—Silencing apparatus characterised by method of silencing by using dead chambers communicating with exhaust gas flow passages comprising at least one perforated tube extending from inlet to outlet of the silencer
    • 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
    • F01N1/023—Helmholtz resonators
    • 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
    • F01N1/026—Annular resonance chambers arranged concentrically to an exhaust passage and communicating with it, e.g. via at least one opening in the exhaust passage
    • 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
    • F01N13/16—Selection of particular materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
    • B29C2049/2008—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements inside the article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
    • B29C2049/2021—Inserts characterised by the material or type
    • B29C2049/2047—Tubular inserts, e.g. 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/22—Methods or apparatus for fitting, inserting or repairing different elements by welding or brazing
    • 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
    • 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
    • F01N2530/18—Plastics material, e.g. polyester resin

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Exhaust Silencers (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Description

【発明の詳細な説明】 本願はブロー成形による合成樹脂製の共鳴型消
音器の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present application relates to a method of manufacturing a resonant silencer made of synthetic resin by blow molding.

共鳴型消音器は自動車エンジンまたは定置式エ
ンジンの、或る特定周波数の騒音を低減するのに
用いられ、弟５図に示すように箱体と、該箱体を
貫通したパイプの箱体内に穿設した小孔により騒
音を低減するものである。 Resonant silencers are used to reduce noise at a certain frequency from automobile engines or stationary engines.As shown in Fig. The small holes provided reduce noise.

このものは第５図、第６図において厚さｔ、複
数の小孔ｄを穿設したパイプＤを加温し、スライ
ドコアＳに載置したのち例えばエアシリグＨによ
りパイプＤの上端をノズルＮへ気密に押圧し、パ
イプＤの外側にノズルＮからパリソンＰを所定長
さ垂下させ、金型Ｆ、Ｇを型締めして、エア流通
路Ｅから圧縮エアを射出する。そして圧縮エアは
複数の小孔ｄより金型Ｆ、Ｇの空間部に同じ圧力
でパリソンを膨張させ、空胴部Ｃなる箱体Ｂが成
形される。その後図示しない冷却装置で金型を冷
却し型開きして第５図に示す共鳴型消音器Ａが成
形されるのである。 5 and 6, a pipe D having a thickness t and a plurality of small holes d is heated, placed on a slide core S, and then the upper end of the pipe D is inserted into a nozzle N using, for example, an air cylinder H. The parison P is suspended from the nozzle N to the outside of the pipe D by a predetermined length, the molds F and G are clamped, and compressed air is injected from the air flow path E. Then, the compressed air inflates the parison at the same pressure into the spaces of the molds F and G through the plurality of small holes d, and the box B, which is the cavity C, is formed. Thereafter, the mold is cooled with a cooling device (not shown) and opened to form the resonance type muffler A shown in FIG. 5.

しかしながら、箱体から突出しているパイプ
の、少なくとも片方が曲管であればホース連結等
による共鳴型消音器のレイアウトが少ないスペー
スで可能であるのに対し、上記製造方法では曲管
のパイプ付きが製造できない欠点を有している。 However, if at least one of the pipes protruding from the box is a curved pipe, it is possible to lay out a resonant silencer by connecting hoses, etc. in a small amount of space. It has the disadvantage that it cannot be manufactured.

本願は上記に鑑み、その不具合を解消するため
のもので、中央にエア流通路、その外周にパリソ
ン注出口を有するノズルと、該ノズルに前記エア
流通路と連通するエア流出孔を有するパイプの保
持具を固定し、該保持具には箱体の内部のパイプ
となる小孔穿設の内管を保持し、曲管部成形用の
モールドを利用し、所望形状の共鳴型消音器をブ
ロー成形で製造するものでありその実施例を以下
図面により説明する。 In view of the above, the present application is intended to solve the problem, and includes a nozzle having an air flow passage in the center and a parison outlet on its outer periphery, and a pipe having an air outlet hole communicating with the air flow passage in the nozzle. A holder is fixed, and the holder holds an inner tube with a small hole that will become the pipe inside the box, and a resonant silencer of the desired shape is blown using a mold for forming a curved pipe part. It is manufactured by molding, and examples thereof will be explained below with reference to the drawings.

第１図は本願により製造さりれた共鳴型消音器
１０の一方向の縦断面図である。内管１は例えば
射出成形であらかじめ製作された両端開口の合成
樹脂製のもので、内径２、長さ３、板厚４、それ
に単数または複数の小孔５が穿設されている。 FIG. 1 is a vertical sectional view in one direction of a resonant muffler 10 manufactured according to the present invention. The inner tube 1 is made of synthetic resin and has both ends opened, for example, by injection molding, and has an inner diameter of 2, a length of 3, a thickness of 4, and one or more small holes 5.

そして箱体６、直管部７、曲管部８はブロー成
形で前記内管１に形成されたもので直管部７、内
管１、曲管部８の内径はほぼ同径でエア流路９を
形成している。 The box body 6, the straight pipe part 7, and the curved pipe part 8 are formed on the inner pipe 1 by blow molding, and the inner diameters of the straight pipe part 7, the inner pipe 1, and the curved pipe part 8 are almost the same, so that air can flow easily. It forms road 9.

第２図〜第４図は第１図の共鳴型消音器１０の
製造方法を説明するためのもので第３図、第４図
は第２図の矢視Ｙの断面図である。 2 to 4 are for explaining a method of manufacturing the resonance type muffler 10 shown in FIG. 1, and FIGS. 3 and 4 are cross-sectional views taken in the direction of arrow Y in FIG. 2.

第２図は第１図の共鳴型消音器１０の形状を形
成するための断面図であり割り型のモールド２０
の片側のみが示され、その矢視Ｙの第３図、第４
図は割り型のモールド１９ａ、１９ｂが示されて
いる。 FIG. 2 is a cross-sectional view for forming the shape of the resonance type muffler 10 shown in FIG. 1, using a split mold 20.
Only one side of the is shown, and the direction of arrow Y in FIGS. 3 and 4
The figure shows split molds 19a and 19b.

ノズル１１の中央にはエア流通路１２、その外
周には前記内管１の外径より大なるパリソン１３
の注出口１４が設けられている。そしてノズル１
１にはエア流通路１２と連通するエア流出孔１６
ａ，１６ｂを穿設した円筒１７ａ，１７ｂおよび
円錐台１８で形成した保持具１５が例えば螺着さ
れている。 An air flow passage 12 is provided at the center of the nozzle 11, and a parison 13 larger than the outer diameter of the inner tube 1 is provided at the outer periphery of the air flow passage 12.
A spout 14 is provided. and nozzle 1
1 has an air outlet hole 16 that communicates with the air flow passage 12.
For example, a holder 15 formed of cylinders 17a and 17b having holes a and 16b and a truncated cone 18 is screwed.

第３図、第４図に示すようにモールド２０は割
り型であり、図例のように１９ａ，１９ｂからな
る。 As shown in FIGS. 3 and 4, the mold 20 is a split mold, and consists of 19a and 19b as shown in the figures.

（詳細後述参照） 次に共鳴型消音器１０の製造方法を説明する。(See details below) Next, a method for manufacturing the resonance type muffler 10 will be explained.

第３図に示すように保持具１５の円筒１７ａに
加温後の内管１を、小孔５が塞がらない位置まで
下方より挿入し、その外側に所定長さのパリソン
１３を注出口１４より垂下した後に、モールド１
９ａ，１９ｂを型締めする。その時は第２図、第
４図に示すように内管１の上下端とモールド２０
１９ａ，１９ｂは僅かに隙間を有しパリソン１３
は切断されることなく、連続した形状を維持す
る。そしてモールド１９ａ，１９ｂの最下端のみ
が圧接し、パリソン１３の下部は切断されるとと
もに封緘され袋状となる。その後図示しないエア
圧縮機から加圧されたエアが、エア流通路１２を
経てエア流出孔１６ａ，１６ｂから徐々に射出さ
れ、１６ａからのエアは内管１の小孔５よりモー
ルド２０内の箱体６を、また内端１の下方の開口
からのエアは曲管８を、さらに１６ｂからの射出
エアにより直管部７がパリソン１３の膨張でモー
ルド２０の形状に成形し、また僅かな隙間を有す
る内管１の上下端はパリソン１３と溶着する。そ
の工程が終了後図示しない冷却装置でモールド２
０を冷却しモールド２０内のパリソン１３および
内管１の上下端とパリソン１３の接合面を固化す
る。然る後にモールド１９ａ，１９ｂを型開きす
るがモールド１９ａ，１９ｂの直管部７の上部位
置には薄刃状離型部２１が設けられており、製品
は容易に保持具１５より取外すことができる。そ
してさらに離型後曲管部８先端の閉端を切除する
ことにより曲管部８を有する共鳴型消音器１０が
製造できることになる。 As shown in FIG. 3, the heated inner tube 1 is inserted into the cylinder 17a of the holder 15 from below until the small hole 5 is not blocked, and the parison 13 of a predetermined length is inserted outside of the inner tube 1 from the spout 14. After hanging down, mold 1
9a and 19b are clamped. At that time, as shown in FIGS. 2 and 4, the upper and lower ends of the inner tube 1 and the mold 20
19a and 19b have a slight gap between the parison 13
maintains a continuous shape without being cut. Then, only the lowest ends of the molds 19a and 19b are brought into pressure contact, and the lower part of the parison 13 is cut and sealed to form a bag-like shape. Thereafter, pressurized air from an air compressor (not shown) passes through the air flow path 12 and is gradually injected from the air outlet holes 16a, 16b. The air from the lower opening of the inner end 1 forms the curved pipe 8, and the straight pipe part 7 is formed into the shape of the mold 20 by the expansion of the parison 13 by the injection air from 16b. The upper and lower ends of the inner tube 1 are welded to the parison 13. After the process is completed, mold 2 is molded using a cooling device (not shown).
0 to solidify the parison 13 in the mold 20 and the joint surfaces of the parison 13 and the upper and lower ends of the inner tube 1. After that, the molds 19a and 19b are opened, and the molds 19a and 19b are provided with a thin blade-like mold release part 21 at the upper position of the straight pipe part 7, so that the product can be easily removed from the holder 15. . Then, by cutting off the closed end of the tip of the curved tube section 8 after releasing the mold, the resonance type muffler 10 having the curved tube section 8 can be manufactured.

上述のように本願は、中央にエア流通路、その
周囲にパリソンの注出口を有するノズルに、前記
エア流通路と連通するエア流出孔を穿設した内管
の保持具を固定し、該保持具に内管を保持した
後、ブロー成形で内管の上方に直管部、内管の下
方に曲管部を形成するとともに、小孔を有する内
管の外側に箱体を形成できるようにしたので、工
数も少なく曲管を有する共鳴型消音器を製造する
ことが可能となつた。 As described above, the present application fixes a holder of an inner tube having an air outlet hole communicating with the air flow passage to a nozzle having an air flow passage in the center and a parison outlet around the nozzle, and After holding the inner tube in the tool, blow molding is performed to form a straight tube section above the inner tube and a curved tube section below the inner tube, as well as to form a box body on the outside of the inner tube having small holes. Therefore, it has become possible to manufacture a resonant silencer having a curved pipe with less man-hours.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本願による製品の縦断面図、第２図は
その製品の製造方法の説明用要部断面図、第３図
は第２図の矢視Ｙ方向の型開き時の要部断面図で
第４図はその型締時の断面図、第５図は直管パイ
プ使用の共鳴型消音器の縦断面図で第６図はその
製造方法を説明するための概略要部断面図であ
る。 １……内管、５……小孔、６……箱体、７……
直管部、８……曲管部、１０……共鳴型消音器、
１１……ノズル、１２……エア流通路、１３……
パリソン、１４……注出口、１５……保持具、１
６ａ，１６ｂ……エア流出孔、１７ａ，１７ｂ…
…円筒、１８……円錐台、１９ａ，１９ｂ，２０
……モルード。 Fig. 1 is a longitudinal cross-sectional view of the product according to the present application, Fig. 2 is a cross-sectional view of the main part for explaining the manufacturing method of the product, and Fig. 3 is a cross-sectional view of the main part when the mold is opened in the direction of arrow Y in Fig. 2. Fig. 4 is a sectional view of the mold when it is clamped, Fig. 5 is a longitudinal sectional view of a resonant silencer using a straight pipe, and Fig. 6 is a sectional view of the main parts to explain its manufacturing method. . 1...Inner pipe, 5...Small hole, 6...Box body, 7...
Straight pipe section, 8... Bent pipe section, 10... Resonance type silencer,
11... Nozzle, 12... Air flow path, 13...
Parison, 14... Outlet, 15... Holder, 1
6a, 16b...Air outflow hole, 17a, 17b...
...Cylinder, 18...Truncated cone, 19a, 19b, 20
...Morude.

Claims (1)

【特許請求の範囲】[Claims] １ 中央にエア流通路、その外周にパリソンの注
出口を有するノズルに、前記エア流通路と連通す
るエア流出孔を穿設したパイプの保持具を固定
し、該保持具に、両端が開口し中間に小孔を穿設
した円筒状の内管を保持し、該内管の外側にノズ
ルの注出口よりパリソンを所定長さ垂下した後
に、割型のモールドを型締めし、前記エア流出孔
より圧縮エアをパリソン内へ射出し、内管の上方
に直管部、内管の下方に曲管部を成形するととも
に、内管の外側に箱体を成形することを特徴とす
る合成樹脂製の共鳴型消音器の製造方法。1. A pipe holder having an air outlet hole communicating with the air flow passage is fixed to a nozzle having an air flow passage in the center and a parison spout on the outer periphery, and a pipe holder having an air outlet hole communicating with the air flow passage is fixed to the nozzle. A cylindrical inner tube with a small hole bored in the middle is held, and after hanging the parison for a predetermined length from the outlet of the nozzle on the outside of the inner tube, the split mold is clamped and the air outlet hole is closed. Made of synthetic resin, compressed air is injected into the parison, a straight pipe part is formed above the inner pipe, a curved pipe part is formed below the inner pipe, and a box body is formed outside the inner pipe. A method for manufacturing a resonant silencer.
JP59205073A 1984-09-28 1984-09-28 Manufacture of resonance type muffler of synthetic resin Granted JPS6183020A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59205073A JPS6183020A (en) 1984-09-28 1984-09-28 Manufacture of resonance type muffler of synthetic resin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59205073A JPS6183020A (en) 1984-09-28 1984-09-28 Manufacture of resonance type muffler of synthetic resin

Publications (2)

Publication Number Publication Date
JPS6183020A JPS6183020A (en) 1986-04-26
JPH0430900B2 true JPH0430900B2 (en) 1992-05-25

Family

ID=16500973

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59205073A Granted JPS6183020A (en) 1984-09-28 1984-09-28 Manufacture of resonance type muffler of synthetic resin

Country Status (1)

Country Link
JP (1) JPS6183020A (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4420879A1 (en) * 1994-06-15 1995-12-21 Mann & Hummel Filter Manufacturing process for a hollow body with an internal support frame
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JP4697743B2 (en) * 2006-05-24 2011-06-08 株式会社イノアックコーポレーション Multi-room resonator
FR2946278B1 (en) * 2009-06-03 2011-06-17 Mann & Hummel Gmbh METHOD FOR MANUFACTURING ACOUSTIC DEVICE OF PLASTIC MATERIAL BY EXTRUSION BLOWING
US8323556B2 (en) 2009-09-30 2012-12-04 Ford Global Technologies, Llc Manufacture of an acoustic silencer
JP5325764B2 (en) 2009-12-25 2013-10-23 日野自動車株式会社 Intake duct and manufacturing method thereof
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