JPS6165982A - Double steel pipe - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は自動車エンジンの排気管等に用いて排気管放散
音の低減等に有効な２重鋼管に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a double steel pipe that is used as an exhaust pipe of an automobile engine and is effective for reducing exhaust pipe noise.

（従来技術） 自動車のエンジンの多岐管から消音器に至る間を結ぶ排
気管は、管内を高温のかつ脈動圧力の排気ガスが流れる
ので、エンノンがその機械振動で発生した振動がフラン
ジ等を介して伝達し排気管を振動させて発生した騒音と
脈動排気ガスによシ管自身が振動して発生した騒音との
両者を周囲に放散することになる。自動車騒音は動力音
と走行音に大別され、前者はエンジン、ラノエータファ
ンおよび排気ガスなどによシ、また後者は道路とタイヤ
との転勤接触および車体の風切りなどに上シ生じ、そし
て排気管放散音は前者の約１４チと言われている。そこ
で低騒音の自動車を実現すべく放散前の少ない排気管用
鋼管の研究開発が進められている。(Prior art) In the exhaust pipe that connects the manifold of an automobile engine to the silencer, high temperature and pulsating pressure exhaust gas flows through the pipe, so the vibrations generated by the mechanical vibration of the ennon are transmitted through the flange, etc. Both the noise generated by the vibration of the exhaust pipe and the noise generated by the vibration of the exhaust pipe itself due to the pulsating exhaust gas are dissipated into the surroundings. Automobile noise can be broadly divided into power noise and running noise.The former is caused by the engine, the exhaust fan, and exhaust gas, while the latter is caused by the rolling contact between the tires and the road and the wind blowing on the car body. The sound emitted by the tube is said to be about 14 chi. Therefore, in order to realize low-noise automobiles, research and development is underway on steel pipes for exhaust pipes that emit less emissions.

放散前の少ない排気管には材質面で工夫、開発されたフ
ェライト系ステンレス管があり、また構造面で工夫、開
発された２重管等がある。しかし、前者の現状は放射音
の低減効果が少なく、また高価になるという欠点があり
、後者の現状は低減効果が今一つ充分でなく、また熱形
きようによって低減効果が大きく変化する等の欠点を有
する。即ち、従来の排気管は殆んどが鋼単管であり、こ
れは殆ど防音機能は有しないが、これを吸・遮音材で包
囲すれば、当然騒音低減に効果がある。しかしこの種の
ものは充分低騒音にするには吸音材の厚みを大にせねば
ならず、従って全体としては嵩張ったものになってしま
う。また排気管は曲っているので吸音材の取付けが厄介
である。この点、２重管方式のものは単管とほぼ同様に
扱えるので有利である。そこで２重管より更に遮音２制
振等の効果をもつ内、外管の間に中間層を持つ多層管が
特開昭５７−５１０８１号公報の如くその後開発された
。この多層管は音の低減等について２重管に比べ有効で
あるが効果には限界がちる。Exhaust pipes with low pre-dissipation include ferritic stainless steel pipes that have been devised and developed in terms of materials, and double pipes that have been devised and developed in terms of structure. However, the current state of the former has the disadvantage that it has little effect in reducing radiated sound and is expensive, while the current state of the latter has disadvantages such as the reduction effect is not quite sufficient and the reduction effect changes greatly depending on the heat shape. has. That is, most conventional exhaust pipes are single steel pipes, which have almost no soundproofing function, but if they are surrounded by a sound-absorbing/sound-insulating material, it is naturally effective in reducing noise. However, in order to achieve sufficiently low noise in this type of device, the thickness of the sound absorbing material must be increased, resulting in a bulky device as a whole. Additionally, the exhaust pipe is curved, making it difficult to install sound absorbing material. In this respect, the double pipe type is advantageous because it can be handled almost in the same way as a single pipe. Therefore, a multilayer tube having an intermediate layer between the inner and outer tubes, which has effects such as sound insulation and vibration damping, was later developed as disclosed in Japanese Patent Application Laid-Open No. 57-51081. Although this multilayer pipe is more effective than a double pipe in terms of sound reduction, etc., there are limits to its effectiveness.

（発明の目的） 本発明の目的は自動車の排気管に用いられる２重鋼管に
かいて、排気管放散音が従前のものに比べて極めて少な
い２重鋼管を提供することにある。(Object of the Invention) An object of the present invention is to provide a double steel pipe used for an automobile exhaust pipe, which emits extremely less noise emitted from the exhaust pipe compared to conventional pipes.

（発明の構成・作用） 本発明の特徴とする所は、内管、外管よシなる金属製２
重管において、内管が貫通された孔を有することを特徴
とするものであり、さらに好ましくはこれらの内・外管
の間に空間をもうけるための中間層制を有することにあ
る。以下１．８４而を０黙しながら本発明の詳細な説明
する。(Structure and operation of the invention) The feature of the present invention is that the inner tube and the outer tube are made of metal.
The heavy pipe is characterized by having a hole through which the inner pipe is penetrated, and more preferably has an intermediate layer system to create a space between the inner and outer pipes. The present invention will be described in detail below without mentioning 1.84.

第１図は本発明に係る２重管の構造を示し、第２図にさ
らに内・外管の間に空間をもうけろために中間層材とし
て全屈網状を有する本発明に１系ろ複層管の構造を示す
。第３図、第４図、第５０、第６図、第７図は本発明複
層管の構造の例を示す説明図でちる。これらの図に示す
ように本発明では内管１に貫通した孔３を有し、この孔
径は好ましくは管外径の０．３倍以下でおるとともに、
４〜４０％の開孔率を有する。さらに好壕しくは内管１
と外管２の間に空隙を有することでちる。第１図のもの
は内管１に管径の０．３倍以下の径で４〜４０チの開孔
率の孔３を有し、かつ内、外管の間に空隙部のないもの
で、第３図にその断面を示す。Fig. 1 shows the structure of a double pipe according to the present invention, and Fig. 2 shows the structure of a double pipe according to the present invention, and Fig. 2 shows a single filter structure of the present invention having a fully curved mesh as an intermediate layer material in order to create a space between the inner and outer pipes. The structure of the layer pipe is shown. 3, 4, 50, 6, and 7 are explanatory diagrams showing examples of the structure of the multilayer pipe of the present invention. As shown in these figures, the present invention has a hole 3 penetrating the inner tube 1, and the diameter of this hole is preferably 0.3 times or less than the outer diameter of the tube,
It has a porosity of 4 to 40%. Furthermore, it is preferable that the inner tube 1
This is achieved by providing a gap between the outer tube 2 and the outer tube 2. The one in Figure 1 has holes 3 in the inner tube 1 with a diameter of 0.3 times the tube diameter or less and a porosity of 4 to 40 inches, and there is no void between the inner and outer tubes. , whose cross section is shown in FIG.

第２図のものは内管１に管径の０．３倍以下の径で４〜
４０チの開孔率の孔３を有し、かつ内外管の間に空隙部
をもうけるために金属網等の中間層材４を介挿させたも
ので第４図、第５図、第６図は内外管の間に間隙部５を
もうけるだめの中間層材４を介挿させた例を示し第７図
は内外管の間に空隙部５をもうけるために管の一部に突
起部６を有しているものである。The one in Figure 2 has inner pipe 1 with a diameter of 0.3 times or less than the pipe diameter.
It has holes 3 with a porosity of 40 mm, and an intermediate layer material 4 such as a metal mesh is inserted between the inner and outer tubes to create a gap between the inner and outer tubes. The figure shows an example in which an intermediate layer material 4 is inserted to create a gap 5 between the inner and outer tubes, and FIG. 7 shows a projection 6 on a part of the tube to create a gap 5 between the inner and outer tubes It has the following.

このようにすると熱形きようの少ないｇｉｈ、た放散騒
音低減効果が得られる。In this way, it is possible to reduce the amount of heat generated and the effect of reducing the dissipated noise.

（実施例） 次に実施例を第１表に挙げる。(Example) Examples are listed in Table 1 below.

第１表で煮は試料番号で１．２．３は比較例であり、４
　、５　、６　、７　、８　、９は本発明のもので心る
。また試料、ｆＬｌの比較材は径６５ｍｍ、厚さ２．４
ｍの単管、他はすべて２重管であり、径６５問、厚みは
内、外管とも１．２酬でちる。またＡはアズロールでの
、またＢは８００℃で５時間加熱した後での測定結果を
示す。In Table 1, boiled is the sample number, 1.2.3 is the comparative example, and 4
, 5, 6, 7, 8, and 9 are those of the present invention. In addition, the comparative material of the sample and fLl has a diameter of 65 mm and a thickness of 2.4 mm.
m single tube, all others are double tubes, with a diameter of 65 and a thickness of 1.2 mm for both the inner and outer tubes. Further, A shows the measurement results with Azurol, and B shows the measurement results after heating at 800° C. for 5 hours.

音圧レベルの試験は長さ１０００ｍｍの管の両端をチャ
ックおよびピゲットからなる支持部材で押え、管内に復
数個の鋼球を入れ、該支持部材を回転させることによυ
該管を回転させて鋼球で管内面を叩打させ、管付近に置
いた騒音計で管よりの放散前を測定して行なった。The sound pressure level test was carried out by holding both ends of a 1000 mm long tube with a support member consisting of a chuck and a pigget, inserting several steel balls into the tube, and rotating the support member.
The tube was rotated and the inner surface of the tube was struck with a steel ball, and a sound level meter placed near the tube was used to measure the amount of noise before it was released from the tube.

第　　１　　表 この表から分るように試料Ａ１の単管は他のいずれの管
よりも騒音が大である。また試料Ａ２の比較材は中間層
材がなく、この場合Ｓ音はアズロールのものでも９５．
５　ｄＢと高く、８００℃に加熱後ではそれより更に高
くなる。試料Ａ３の比較材は中間層材としてガラスクロ
スを介挿している。Table 1 As can be seen from this table, the single tube of sample A1 is louder than any other tube. In addition, the comparison material of sample A2 does not have an intermediate layer material, and in this case, the S sound is 95.
It is as high as 5 dB, and becomes even higher after heating to 800°C. In the comparative material of sample A3, glass cloth was inserted as an intermediate layer material.

この場合騒音はアズロールのものでも８００℃に加熱後
のものでも９２〜９２．５　ｄＢと性能が良いが、本発
明者は今回、さらに効果のある構造のものを四元した。In this case, both the Azuror type and the type after heating to 800°C have a good performance of 92 to 92.5 dB, but the present inventors have now created a quaternary type with an even more effective structure.

試料Ａ４は本発明の１例で孔径４間で開孔率１５％を持
つ内管で内外管の間に中間層材のない２重管で音圧レベ
ルが試料Ａ３に比べ約４ｄＢ低減する。試料＆　５　、
６　、７　、８　、９は内管に孔加工を施こしたもので
、さらに内外管の間に空隙を保持するため金属網を介挿
させたものであるが孔径および開孔率によって音圧レベ
ルが異なる。Sample A4 is an example of the present invention, and is a double tube with an inner tube having a hole diameter of 4 and a porosity of 15%, and no intermediate layer material between the outer and outer tubes, and the sound pressure level is reduced by about 4 dB compared to sample A3. Sample & 5,
6, 7, 8, and 9 have holes machined in the inner tube, and a metal mesh is inserted to maintain a gap between the inner and outer tubes, but the sound pressure may vary depending on the hole diameter and aperture ratio. Different levels.

試料煮７は孔径１０箇（０，１５Ｄ）で開孔率２０チの
もので試料扁９は孔径４ｍｍ（０，０６Ｄ）で開孔率１
５チのもので、それぞれ試料Ａ３に比べ音圧レベルが約
６　ｄＢ低減して極めて有利なものである。Sample 7 has a pore diameter of 10 (0.15D) and a porosity of 20, and sample flat 9 has a pore diameter of 4 mm (0.06D) and a porosity of 1.
The sound pressure level was reduced by about 6 dB compared to sample A3, which is extremely advantageous.

しかし試料＆５のものは孔径４　ｒｔａ　（０，０６Ｄ
）で開孔率２％のもので、試料Ａ６のものは孔径４簡（
［１，０６Ｄ）で開孔率６０係のもので、試料Ａ　８の
ものは孔径２０　ｔｍ　（０，３１Ｄ）で開孔率２０悌
のものであるが、それぞれ試料１ｆｘ　３　Ｋ比べそれ
なりに効果はあるが音圧レベルで１〜２　ｄＢの低減で
あり孔径および関孔率卦よび内外管の間の空隙の有焦に
よって音圧レベルが変化することが解る。以」二の様に
内管に孔加工を施こされている事が必要でその孔径は０
，３Ｄ以下で開孔率４〜４０係がよシ有利という事にな
る。又内外管の間に空隙を確保すると更に効果がある。However, sample &5 has a pore diameter of 4 rta (0,06D
) with a porosity of 2%, and sample A6 has a pore diameter of 4 (
Sample A8 has a pore diameter of 20 tm (0,31D) and a porosity of 20°, but each has a certain effect compared to sample 1fx 3K. However, it is understood that the sound pressure level is reduced by 1 to 2 dB, and the sound pressure level changes depending on the hole diameter, the porosity, and the focusing of the gap between the inner and outer tubes. It is necessary that the inner tube has a hole machined as shown in 2 below, and the hole diameter is 0.
, 3D or less, a hole area ratio of 4 to 40 is very advantageous. Further, it is more effective to ensure a space between the inner and outer tubes.

本発明の２重管の低数散音性は次のように説明すること
ができる。即ち内管と外管が摩擦することによる２重管
構造としての割損機能以外に内管に孔を施こすことによ
り内管と外管の撮動波形が異なり撮動をお互いに打消す
働きがあること、卦よび内管と外管の間に空隙をもうけ
る事だよυ内管の孔から気体が流入流出しダンパーとし
ての機能を果すので排気管に使用した場合、脈動排気ガ
スによシ管が振動して騒音を発生するのと、エンジンか
らの騒音を伝達してそれを放散するのどの両者を抑える
ことができる。The low noise dispersion property of the double pipe of the present invention can be explained as follows. In other words, in addition to the breakage function of the double tube structure due to friction between the inner and outer tubes, the creation of holes in the inner tube causes the imaging waveforms of the inner and outer tubes to differ and cancel each other out. It is important to make sure that there is a gap between the inner pipe and the outer pipe. υGas flows in and out through the holes in the inner pipe and acts as a damper, so when used in an exhaust pipe, it will prevent pulsating exhaust gas from forming. This can reduce both the noise generated by the vibration of the pipe and the transmission and dissipation of noise from the engine.

そこでダンパーとしての機能を果すＫは内管の孔は孔径
が０．３Ｄ以下、開孔率４〜４０％がよシ有利でありこ
の範囲外ではダン・ぐ−としての機能が弱められると解
される。又４０％超では内管としての強度が低下し、曲
げ加工すると挫屈する場合がたまにあシ、開孔率は４０
％以下がよシ好ましい。この本発明の２重管は適宜の方
法で作ることができるが第８図に電縫管方式による製造
法を示す。Therefore, for K, which functions as a damper, it is most advantageous for the pores in the inner tube to have a pore diameter of 0.3D or less and an open area ratio of 4 to 40%, and it is understood that outside this range, the function as a damper will be weakened. be done. In addition, if it exceeds 40%, the strength as an inner tube will decrease, and sometimes it will buckle when bent, and the opening ratio will be 40%.
% or less is highly preferable. Although the double pipe of the present invention can be manufactured by any suitable method, FIG. 8 shows a manufacturing method using the electric resistance welded pipe method.

この図で１０　、１１は外管、内管用ストリップのアン
コイラ−１１２は中間層材（金属製金網）のアンコイラ
−１１３はガイド９０−ル、１４は成形ロール、１５は
高周波電源、１６は溶接用コイル、１７はスクイズロー
ルである。また１８はストリップ連続供給のだめの溶接
装置、１９はその溶接中もストＩＪツブを供給するため
のルーパである。In this figure, 10 and 11 are the outer tube, the inner tube strip uncoiler, 112 is the intermediate layer material (metal wire mesh) uncoiler, 113 is the guide 90, 14 is the forming roll, 15 is the high frequency power source, and 16 is for welding. Coil 17 is a squeeze roll. Further, 18 is a welding device for continuously supplying the strip, and 19 is a looper for supplying the strip IJ tube even during welding.

内、外管用ス）　ＩＪッデはアンコイラ−３０，３２か
ら繰り出され、これらのストリップの間にアンコイラ−
３４から繰９出された金ＦＳ製金網が挿入され、これら
の３者が成形ロール１４で管状に曲げられ、溶接用コイ
ル１６によｐ高周波誘導加熱され、スクイズロール１７
で圧着さ五、２重管となる。この場合の内管用ストリッ
プは竿前に孔加工を施こしたものを使用するが、事前に
孔加工しない場合はアンコイラ−１１と成形ロール１４
の間で孔をあける設備（図示せず）で孔加工してもよい
。又別の製造法として事前に外管および内管用素管を製
造して内管に孔加工を施こして外管の中に内管を挿入し
、この時内外管の間に空隙を保持するス梨−サー金同時
に挿入して２重管にしてもよい。この様に本発明はどの
様な方法で製造しても良く、ようは２東管の構造として
内管に孔加工が施こ婆れており、さらに好ましくは内管
と外管の間に空隙をもっていることが要点である。The IJ strips for inner and outer tubes are fed out from uncoilers 30 and 32, and the uncoiler is inserted between these strips.
A wire mesh made of gold FS drawn out from 34 is inserted, and these three pieces are bent into a tubular shape by a forming roll 14, heated by high frequency induction by a welding coil 16, and then passed through a squeeze roll 17.
It is crimped to form a double tube. In this case, the strip for the inner tube is one with holes drilled at the front of the rod, but if holes are not drilled in advance, the uncoiler 11 and forming roll 14 are used.
The holes may be formed using equipment (not shown) that makes holes between the holes. Another manufacturing method is to manufacture the outer tube and the inner tube in advance, drill holes in the inner tube, insert the inner tube into the outer tube, and maintain a gap between the inner and outer tubes at this time. It is also possible to insert the sleeve and the ring at the same time to make a double tube. As described above, the present invention may be manufactured by any method, and it is preferable that the inner tube has a hole-processed structure as a two-east tube, and it is more preferable that there be a gap between the inner tube and the outer tube. The key is to have the following.

（５６明の効果） 以上詳細に説明したように本発明によれば、今までより
も優れた低数散音性が−得られ、排気管用に適した複合
２重鋼管が得られるものである。(Effect of 56 light) As explained in detail above, according to the present invention, it is possible to obtain a composite double-walled steel pipe that has better low noise dispersion properties than ever before and is suitable for use as an exhaust pipe. .

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

第１図、第２図は本発明の実施例に係る複合２重ぐこ４
管の斜視図、ｍ　３　Ｉ２Ｉ、第・１図、４５５図、第
６図、第７図はそれらの断面図、第８図は製管工程の説
明図である。 】８内管　　　　　　２：外管 ３：孔　　　　　　　４：中間層材 ５：空隙部　　　　　６：突起部 １０：アンコイラ−１１：アンコイラ−１２：アンコイ
ラ−１３ニガイドロール１４：成形ロール　　１５：高
周波電源ｘ６：溶ｉ用コイル　１７：スクイズロール１
８：溶接装置　　　１９ニル−ツヤ−第２図 第　３　図 、５：’ｉ！Ｍすや 第５図 ４′ 第６０ 第　７　図Figures 1 and 2 show composite double gullet 4 according to an embodiment of the present invention.
A perspective view of the pipe, m 3 I2I, Fig. 1, Fig. 455, Fig. 6, and Fig. 7 are cross-sectional views thereof, and Fig. 8 is an explanatory diagram of the pipe manufacturing process. ]8 Inner tube 2: Outer tube 3: Hole 4: Intermediate layer material 5: Gap 6: Protrusion 10: Uncoiler 11: Uncoiler 12: Uncoiler 13 Ni guide roll 14: Forming roll 15: High frequency power supply x6: Coil for melting 17: Squeeze roll 1
8: Welding equipment 19 Nil - Glossy - Figure 2 Figure 3, 5:'i! M-Suya Fig. 5 4' Fig. 60 Fig. 7

Claims (3)

【特許請求の範囲】[Claims] （１）内管、外管よりなる金属製２重管において、内管
が貫通した孔加工が施こされていることを特徴とする２
重鋼管。(1) A metal double pipe consisting of an inner pipe and an outer pipe, characterized in that a hole is machined through the inner pipe.
Heavy steel pipe. （２）内管の貫通した孔加工の孔の径が管径の０．３倍
以下で開孔率が４〜４０％であることを特徴とする特許
請求の範囲第１項記載の２重鋼管。(2) The double layer according to claim 1, characterized in that the diameter of the hole machined through the inner tube is 0.3 times or less of the tube diameter and the open area ratio is 4 to 40%. Steel pipe. （３）内管と外管の間に空隙を持たせるために中間層材
を介挿させたことを特徴とする特許請求の範囲第１項記
載の２重鋼管。(3) The double steel pipe according to claim 1, characterized in that an intermediate layer material is inserted between the inner pipe and the outer pipe to create a gap.