JP4279615B2 - Intake duct pipe - Google Patents
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- JP4279615B2 JP4279615B2 JP2003186190A JP2003186190A JP4279615B2 JP 4279615 B2 JP4279615 B2 JP 4279615B2 JP 2003186190 A JP2003186190 A JP 2003186190A JP 2003186190 A JP2003186190 A JP 2003186190A JP 4279615 B2 JP4279615 B2 JP 4279615B2
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- JP
- Japan
- Prior art keywords
- pipe
- fabric layer
- woven fabric
- tube
- intake duct
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- 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 - Fee Related
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Description
【０００１】
【発明の属する技術分野】
本発明は、自動車などにおけるエンジンの吸気口とエアークリーナーとの間に設置され、エンジンに空気を供給する吸気ダクト管に関するものであって、特に吸気系の騒音を除去するものである。
【０００２】
【従来の技術】
自動車などの内燃機関の吸気ダクト管は、当該内燃機関の吸気系を構成する管であるが、その管内を空気が通ることにより摩擦音を生じ、その音のうち管と共鳴する部分が気柱共鳴により増幅されて騒音を発する。そのため当該吸気ダクト管は、吸気に伴う騒音を低減することが求められている。
【０００３】
従来、自動車などの内燃機関の吸気ダクト管としては、特開昭６０−５３６５８号公報に示されるような筒状の繊維層の外面に硬質材を設けた構造のものや、特開平５−１２６００２号公報に示されるような多孔質材の円筒からなるもの、特開平４−３２１８９６号公報や特開２０００−６４９１８号公報に示されるような筒状織布よりなるものなどが知られている。
【０００４】
また特開平８−２４０１６４号公報や、特開平１０−２３８４２６号公報などには、硬質管の内側に発泡体よりなる層を形成した二層構造のものが記載されている。
【０００５】
しかしながらこれらの吸気ダクト管は、それぞれ吸気騒音を低減させる効果は見られるものの、いずれも十分なものとは言えなかった。特に硬質材料よりなるものは、その内部で生じた騒音が壁面で反射されて増幅されやすく、それが開口部で集中的に放出される。
【０００６】
また筒状織布よりなるダクト管は、繊維が音のエネルギーを吸収するために騒音を低減させる効果があるが、保形性のない筒状織布のみよりなるものでは筒状の形態を維持することが困難であり、またこれを補強材で筒状の形態を維持した場合には、繊維による吸音効果が損なわれる。
【０００７】
さらに硬質管の内側に発泡体よりなる層を形成した二層構造のものでは、発泡体層により管内の反響を軽減すると共に、硬質管により騒音の管外への放射を抑制することができるが、その騒音の軽減効果は限られている。
【０００８】
【発明が解決しようとする課題】
本発明はかかる事情に鑑みなされたものであって、それ自体が内部で生じた吸気騒音を吸収して外部に放出することのない、極めて静かな吸気ダクト管を提供することを目的とするものである。
【０００９】
【課題を解決するための手段】
而して本発明は、剛直な材料よりなる外層管と、当該外層管の内側に配置された筒状不織布層と、当該筒状不織布層の内側に配置された筒状織布層とよりなり、前記筒状織布層が、環状に配置されたたて糸群と、当該たて糸群と交差して周方向に延びるよこ糸とよりなり、当該よこ糸が、通常の糸条と剛直な線状体とが交互に配置されていることを特徴とするものである。
【００１１】
【発明の実施の形態】
以下本発明の実施の形態を図面に従って説明する。図１及び図２は本発明の吸気ダクト管１を示すものであって、剛直な材料よりなる外層管２の内側に、筒状不織布層３が配置されており、当該筒状不織布層３の内側に筒状織布層４が配置されている。
【００１２】
外層管２は、内部の音を遮蔽して外部に漏らさない作用を有するものであって、塩化ビニル樹脂などの剛直なプラスチック又は金属などの素材よりなる、気密の管である。
【００１３】
また筒状不織布層３は、外層管２内において音の振動エネルギーを吸収し、吸気ダクト管１内における気柱共鳴による音の増幅を阻止する作用を有するものであって、３〜１０mm程度の厚みを有する筒状のフェルト又は不織布を使用するのが適当である。
【００１４】
また筒状織布層４は、吸気ダクト管１の内面を筒状に保持し、筒状不織布層３の繊維が吸気に混入するのを阻止すると共に、その織布構造に基づく内面の凹凸によって音波を乱反射させることにより、気柱共鳴による音の増幅を阻止するものであって、凹凸の激しい織物組織が好ましい。
【００１５】
筒状織布層４の構造の一例として、環状に配置された複数のたて糸５と、当該たて糸５群と交差して周方向に延びるよこ糸６とよりなっており、そのよこ糸６が、通常の天然繊維又は合成繊維のマルチフィラメント糸又はスパン糸よりなる糸条６ａと、金属線又は合成樹脂のブリッスルなどの剛直な線状体６ｂとが、交互に配置されているものであることが好ましい。
【００１６】
【実施例】
［実験１］
本発明の効果を確認するために、以下に示すように種々の管を使用して長さ６０cmの吸気ダクト管を作成し、そのそれぞれについて、ダクトの吸気口部分における吸気音と、ダクトの中間部分における放射音とを測定した。測定の結果を表１に示す。数値の単位はデシベルである。
【００１７】
▲１▼ 内径８５mm、肉厚３mmの硬質塩化ビニル樹脂管
▲２▼ ポリエステル繊維の不織布（目付１０００g/m2、厚み４．５mm）を筒状に形成した内径７０mmの筒状不織布を二重に重ねた管
▲３▼ たて糸として、ポリエステルスパン糸（５番手／６）の糸条を２０２本使用し、よこ糸として、ポリエステルスパン糸（２０／１６×３）とポリエステルマルチフィラメント糸（１６７０ｄ×３）とを撚合わせた糸条と、ポリエステルの１．６mmφブリッスルとを交互に使用して、２６打／１０cmの平織組織で織成した、内径６５mmの筒状織布
▲４▼ ▲１▼の硬質塩化ビニル樹脂管の内側に、▲２▼の筒状不織布を嵌合した管
▲５▼ ▲１▼の硬質塩化ビニル樹脂管の内側に、▲３▼の筒状織布を嵌合した管
▲６▼ ▲１▼の硬質塩化ビニル樹脂管の内側に、目付９２g/m2、厚み１５mmのウレタンフォームを嵌合し、その内側に▲３▼の筒状織布を嵌合した管
▲７▼ ▲１▼の硬質塩化ビニル樹脂管の内側に、目付７６g/m2、厚み１５mmのウレタンフォームを嵌合し、その内側に▲３▼の筒状織布を嵌合した管
▲８▼ ▲１▼の硬質塩化ビニル樹脂管の内側に▲２▼の筒状不織布を嵌合し、さらにその内側に▲３▼の筒状織布を嵌合した管
【００１８】
【表１】
［実験２］
内径８５mm、肉厚３mmの塩化ビニル樹脂管を使用して、２５０mm＋３００mm＋１５０mmの９０°に屈曲した略「Ｚ」字状の管を形成し、当該管に厚み３mmの筒状不織布を嵌合したもの、及びさらにその内側に前記筒状織布を嵌合したものを製作し、これを図３に示すように吸気管７とエアクリーナ８とに接続し、エアクリーナ８に接続したエンジンを運転し、吸気音及び放射音を測定した。結果は表２の通りである。
【００２０】
【表２】
【発明の効果】
本発明によれば、単なる塩化ビニル樹脂管のような硬質管はもとより、従来の硬質管の内側に不織布層を配置したものに比べても、吸気音及び放射音共に大幅に減少している。
【００２２】
吸気ダクト管の騒音の軽減手段は種々のものが知られているが、一般に騒音を数デシベル減少させる程度であり、全体の騒音を１３０デシベル程度に軽減させるのが限界であると考えられている。
【００２３】
しかしながら本発明によれば、硬質管の内側に筒状不織布層と織布層とを形成することにより、放射音及び吸気音共に大幅に軽減させることに成功し、従来のものに比べて１０デシベル以上低下させ、全体として吸気に伴う騒音を１２０デシベル台の前半にまで減少させることができたのである。
【図面の簡単な説明】
【図１】 本発明の吸気ダクト管１の一部を分解して示した斜視図
【図２】 本発明の吸気ダクト管１の一部拡大中央縦断面図
【図３】 本発明の効果を測定する状態の配管の摸式図
【符号の説明】
１ 吸気ダクト管
２ 外層管
３ 筒状不織布層
４ 筒状織布層
５ たて糸
６ よこ糸
６ａ 糸条
６ｂ 線状体[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intake duct pipe that is installed between an intake port of an engine and an air cleaner in an automobile or the like and supplies air to the engine, and particularly removes noise in an intake system.
[0002]
[Prior art]
An intake duct pipe of an internal combustion engine such as an automobile is a pipe constituting the intake system of the internal combustion engine. When air passes through the pipe, a friction noise is generated, and a portion of the sound that resonates with the pipe is a columnar resonance. The noise is amplified by. For this reason, the intake duct pipe is required to reduce noise associated with intake air.
[0003]
Conventionally, as an intake duct pipe of an internal combustion engine such as an automobile, one having a structure in which a hard material is provided on the outer surface of a cylindrical fiber layer as disclosed in JP-A-60-53658, or JP-A-5-126002. Known are those made of a cylinder of a porous material as shown in Japanese Laid-Open Patent Publication No. H., and those made of a cylindrical woven fabric as shown in Japanese Patent Laid-Open Nos. 4-321896 and 2000-64918.
[0004]
JP-A-8-240164, JP-A-10-238426 and the like describe a two-layer structure in which a layer made of a foam is formed inside a hard tube.
[0005]
However, each of these intake duct pipes has an effect of reducing intake noise, but none of them is sufficient. In particular, in the case of a material made of a hard material, noise generated in the interior is easily reflected and amplified by the wall surface, and it is intensively emitted from the opening.
[0006]
A duct tube made of a tubular woven fabric has the effect of reducing noise because the fiber absorbs sound energy, but a tube made of only a tubular woven fabric without shape retention maintains the tubular shape. It is difficult to do this, and when the cylindrical form is maintained with a reinforcing material, the sound absorption effect by the fibers is impaired.
[0007]
Furthermore, in the case of a two-layer structure in which a layer made of a foam is formed inside the hard tube, the foam layer can reduce the echo inside the tube, and the hard tube can suppress the emission of noise to the outside of the tube. The noise reduction effect is limited.
[0008]
[Problems to be solved by the invention]
The present invention has been made in view of such circumstances, and it is an object of the present invention to provide an extremely quiet intake duct pipe that itself absorbs intake noise generated inside and does not discharge it outside. It is.
[0009]
[Means for Solving the Problems]
Thus, the present invention comprises an outer layer tube made of a rigid material, a cylindrical nonwoven fabric layer arranged inside the outer layer tube, and a cylindrical woven fabric layer arranged inside the cylindrical nonwoven fabric layer. The tubular woven fabric layer is composed of a warp yarn group arranged in an annular shape and a weft yarn extending in the circumferential direction intersecting with the warp yarn group, and the weft yarn includes a normal yarn and a rigid linear body. It is characterized by being alternately arranged.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an intake duct pipe 1 of the present invention, in which a cylindrical nonwoven fabric layer 3 is disposed inside an outer layer pipe 2 made of a rigid material. A tubular woven fabric layer 4 is arranged on the inner side.
[0012]
The outer tube 2 has an action of shielding internal sound and not leaking to the outside, and is an airtight tube made of a rigid plastic such as vinyl chloride resin or a metal material.
[0013]
Moreover, the cylindrical nonwoven fabric layer 3 has the effect | action which absorbs the vibration energy of sound in the outer-layer pipe | tube 2, and prevents the amplification of the sound by air column resonance in the intake duct pipe | tube 1, Comprising: About 3-10 mm It is appropriate to use a cylindrical felt or non-woven fabric having a thickness.
[0014]
Further, the tubular woven fabric layer 4 holds the inner surface of the intake duct pipe 1 in a tubular shape, prevents the fibers of the tubular nonwoven fabric layer 3 from being mixed into the intake air, and the unevenness of the inner surface based on the woven fabric structure. A woven fabric structure with severe irregularities is preferable, because the sound waves are irregularly reflected to prevent amplification of sound due to air column resonance.
[0015]
As an example of the structure of the tubular woven fabric layer 4, a plurality of warp yarns 5 arranged in an annular shape and a weft yarn 6 extending in the circumferential direction intersecting with the warp yarn 5 group, the weft yarn 6 is a normal one. It is preferable that the filament 6a made of natural filament or synthetic fiber multifilament yarn or spun yarn and the rigid linear body 6b such as a metal wire or synthetic resin bristle are alternately arranged.
[0016]
【Example】
[Experiment 1]
In order to confirm the effect of the present invention, as shown below, an intake duct pipe having a length of 60 cm is prepared using various pipes, and for each of them, an intake sound at the inlet portion of the duct and an intermediate of the duct The radiated sound at the part was measured. The measurement results are shown in Table 1. Numeric units are decibels.
[0017]
(1) Hard vinyl chloride resin tube with an inner diameter of 85 mm and a wall thickness of 3 mm ( 2 ) Double-layered tubular nonwoven fabric with an inner diameter of 70 mm formed from a polyester fiber nonwoven fabric (weight per unit of 1000 g / m 2 , thickness 4.5 mm) Stacked pipes (3) Use 202 polyester spun yarns (5th / 6) as warp yarns, and weft polyester spun yarns (20/16 × 3) and polyester multifilament yarns (1670d × 3) A cylindrical woven fabric with an inner diameter of 65 mm woven with a plain weave structure of 26 beats / 10 cm using yarns twisted together and 1.6 mmφ bristle made of polyester. A pipe in which a tubular nonwoven fabric of (2) is fitted inside a vinyl resin pipe (5) A pipe in which a tubular woven cloth of (3) is fitted inside a hard vinyl chloride resin pipe of (1) (6) ▼ Inside the hard vinyl chloride resin tube of ▲ 1 ▼ Basis weight 92 g / m 2, fitted urethane foam having a thickness of 15 mm, on the inside of the inside ▲ 3 ▼ tubular woven fabric fitted pipe ▲ 7 ▼ ▲ 1 ▼ rigid PVC resin tube, basis weight 76g A pipe that is fitted with a polyurethane foam with a thickness of 15 mm / m 2 and a tubular woven cloth of (3) inside, and a pipe of (2) inside the rigid vinyl chloride resin pipe of (8) (1). A tube in which a cylindrical nonwoven fabric is fitted, and a tubular woven fabric of (3) is fitted on the inside thereof [0018]
[Table 1]
[Experiment 2]
Using a polyvinyl chloride resin tube with an inner diameter of 85 mm and a wall thickness of 3 mm, a substantially “Z” -shaped tube bent at 90 ° of 250 mm + 300 mm + 150 mm is formed, and a tubular nonwoven fabric with a thickness of 3 mm is fitted to the tube, Further, a product in which the tubular woven fabric is fitted inside is manufactured, and this is connected to an
[0020]
[Table 2]
【The invention's effect】
According to the present invention, not only a hard tube such as a mere vinyl chloride resin tube, but also an intake sound and a radiated sound are greatly reduced as compared with a conventional structure in which a non-woven fabric layer is disposed inside a hard tube.
[0022]
Various means for reducing the noise of the intake duct are known. Generally, the noise is reduced by several decibels, and it is considered that the limit is to reduce the total noise to about 130 decibels. .
[0023]
However, according to the present invention, by forming the cylindrical nonwoven fabric layer and the woven fabric layer inside the hard tube, it has succeeded in greatly reducing both radiated sound and intake sound, and 10 decibels compared to the conventional one. As a result, the overall noise associated with the intake could be reduced to the first half of the 120 dB range.
[Brief description of the drawings]
1 is an exploded perspective view of a part of an intake duct pipe 1 according to the present invention. FIG. 2 is a partially enlarged central longitudinal sectional view of the intake duct pipe 1 according to the present invention. Schematic diagram of piping in measurement state [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Intake duct pipe 2 Outer layer pipe 3 Cylindrical nonwoven fabric layer 4 Cylindrical woven fabric layer 5 Warp thread 6 Weft thread 6a Yarn 6b Linear body
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003186190A JP4279615B2 (en) | 2003-06-30 | 2003-06-30 | Intake duct pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003186190A JP4279615B2 (en) | 2003-06-30 | 2003-06-30 | Intake duct pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2005016487A JP2005016487A (en) | 2005-01-20 |
| JP4279615B2 true JP4279615B2 (en) | 2009-06-17 |
Family
ID=34185389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003186190A Expired - Fee Related JP4279615B2 (en) | 2003-06-30 | 2003-06-30 | Intake duct pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4279615B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5345163B2 (en) * | 2011-01-31 | 2013-11-20 | 株式会社ミトヨ | Noise reduction structure |
| US9297491B2 (en) * | 2012-02-08 | 2016-03-29 | Federal-Mogul Powertrain, Inc. | Thermally resistant convoluted sleeve and method of construction thereof |
| JP6720819B2 (en) * | 2016-10-11 | 2020-07-08 | トヨタ紡織株式会社 | Intake system parts |
-
2003
- 2003-06-30 JP JP2003186190A patent/JP4279615B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2005016487A (en) | 2005-01-20 |
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