JPH08159343A - Duplex pipe - Google Patents
Duplex pipeInfo
- Publication number
- JPH08159343A JPH08159343A JP30333194A JP30333194A JPH08159343A JP H08159343 A JPH08159343 A JP H08159343A JP 30333194 A JP30333194 A JP 30333194A JP 30333194 A JP30333194 A JP 30333194A JP H08159343 A JPH08159343 A JP H08159343A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- support member
- protrusions
- gap
- buffer support
- 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.)
- Pending
Links
Landscapes
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は二重管に関するもので、
より詳しくは内外管の相互の間隙内に緩衝支持部材を配
置して、内外管を同心的に保持する二重管に関する。The present invention relates to a double pipe,
More specifically, the present invention relates to a double pipe in which a buffer support member is arranged in a gap between the inner and outer pipes to concentrically hold the inner and outer pipes.
【０００２】[0002]
【従来の技術】従来、自動車に使用する中空二重排気管
においては、その内管と外管の間で温度差に基づく熱膨
張差が生じる。そのため、図７に示すように、内管１０
１と外管１０２の端部を溶接Ｗで固定すると、内管１０
１に高応力が発生して耐久性が低下し、破損することが
ある。2. Description of the Related Art Conventionally, in a hollow double exhaust pipe used in an automobile, a difference in thermal expansion occurs between the inner pipe and the outer pipe due to the temperature difference. Therefore, as shown in FIG.
1 and the ends of the outer pipe 102 are fixed by welding W, the inner pipe 10
In some cases, high stress is generated in No. 1 and durability is lowered, and it may be damaged.
【０００３】そこで従来、図８に示すように、内管２０
１と外管２０２との間隙内にワイヤネットリング２０３
を配置するとともにワイヤネットリング２０３の内周部
と内管２０１をスポット溶接Ｗで固定して、内外管２０
１，２０２を同心的に保持するとともに両管の熱膨張差
に対してはワイヤネットリング２０３の変形により対応
するものが提案されている。Therefore, conventionally, as shown in FIG.
1 and the outer tube 202 in the gap between the wire net ring 203
And the inner peripheral portion of the wire net ring 203 and the inner pipe 201 are fixed by spot welding W.
It has been proposed to hold 1, 202 concentrically and to cope with the difference in thermal expansion between the two pipes by deforming the wire net ring 203.
【０００４】しかし、この従来構造のものにおいては、
その二重管の曲げ加工後にワイヤネットリング２０３を
間隙内に挿入して溶接Ｗで固定することは、スポット溶
接機の電極が内管２０１内に挿入することができないた
め、不可能である。However, in this conventional structure,
It is impossible to insert the wire net ring 203 into the gap and fix it with the welding W after bending the double pipe because the electrode of the spot welding machine cannot be inserted into the inner pipe 201.
【０００５】また、ワイヤネットリング２０３をスポッ
ト溶接すると、その熱及び加圧力の影響でそのワイヤ切
れや変形を生ずる問題がある。そこで上記のワイヤネッ
トリング２０３のような緩衝支持部材を二重管の間隙内
に固定保持する構造として、図９に示すように内管３０
１と外管３０２との間隙にワイヤネットリング３０３を
配置するとともに該ワイヤネットリング３０３の配置部
分の内管３０１にワイヤネットリング３０３の軸方向の
幅Ｌ3 と同一長の間隔を有して突起部３０４，３０４を
並設し、ワイヤネットリング３０３の両側端を両突起部
３０４，３０４で当接的に保持し、上記溶接保持の問題
を解決したものが公知である。If the wire net ring 203 is spot-welded, there is a problem that the wire is broken or deformed due to the influence of heat and pressure. Therefore, as a structure for fixing and holding a buffer support member such as the wire net ring 203 in the gap of the double pipe, as shown in FIG.
1 and the outer pipe 302, a wire net ring 303 is arranged in the gap, and the inner pipe 301 at the portion where the wire net ring 303 is arranged has a gap having the same length as the axial width L 3 of the wire net ring 303. It is known that the protrusions 304, 304 are arranged side by side, and both ends of the wire net ring 303 are abuttably held by the both protrusions 304, 304 to solve the above-mentioned welding holding problem.
【０００６】[0006]
【発明が解決しようとする課題】しかし上記、図９図に
示す従来構造においては、次のような問題がある。例え
ば、図１０（ａ）に示すように二重管の曲げ加工部付近
において、内管３０１の軸心Ｘ′が、外管３０２の軸心
Ｘに対して図の上方へ偏心している場合に、この部分に
おいて、ワイネットリング３０３が配置されると、その
ワイヤネットリング３０３の偏心方向外周面（図１０の
上側面が）が外管３０２の内面に強く当たる片当りが生
じる。この状態で内管３０１が排気により加熱される
と、その内管３０１が外管３０２に対し温度差によって
外管３０２よりも軸方向へ伸長する。すなわち、図１０
（ｂ）の矢印ＡとＢで示すように内外管３０１，３０２
が相対移動する。However, the conventional structure shown in FIG. 9 has the following problems. For example, when the axial center X ′ of the inner pipe 301 is eccentric to the axial center X of the outer pipe 302 in the vicinity of the bending portion of the double pipe as shown in FIG. When the Wynet ring 303 is arranged in this portion, the eccentric outer peripheral surface (the upper side surface in FIG. 10) of the wire net ring 303 strongly hits the inner surface of the outer tube 302, which causes partial contact. When the inner pipe 301 is heated by exhaust gas in this state, the inner pipe 301 extends axially more than the outer pipe 302 due to the temperature difference with respect to the outer pipe 302. That is, FIG.
As shown by arrows A and B in (b), the inner and outer tubes 301, 302
Move relative to each other.
【０００７】このような移動が生じると、図１０（ｂ）
に示すように、ワイヤネットリング３０３の内管３０１
と接触する側が、両突起３０３，３０３により内管３０
１との軸方向への相対移動が拘束されていることによっ
て、ワイヤネットリング３０３の外周側部３０４が図１
０（ｂ）のように引っ張られ、ワイヤネットリング３０
３内に強いねじり応力が発生する。また冷却によって両
管３０１と３０２の相対移動が上記とは逆方向になる
と、上記外周部３０４が図１０（ｂ）とは逆方向に引っ
張られ、逆方向のねじり応力が発生する。When such movement occurs, FIG. 10 (b)
As shown in FIG.
The side that comes into contact with the inner tube 30 is
The relative movement of the wire net ring 303 to the outer circumferential side 304 of the wire net ring 303 in FIG.
The wire net ring 30 is pulled like 0 (b).
A strong torsional stress is generated in 3. Further, when the relative movement of both pipes 301 and 302 becomes the opposite direction due to the cooling, the outer peripheral portion 304 is pulled in the opposite direction to that in FIG. 10B, and the torsion stress in the opposite direction is generated.
【０００８】このようなことが繰り返されると、ワイヤ
ネットリング３０３の劣化（へたり）が促進され、その
機能が早期に低下する問題がある。そこで本発明は、上
記の各問題を解消することができる二重管を提供するこ
とを目的とするものである。When such a process is repeated, deterioration (settling) of the wire net ring 303 is promoted, and there is a problem that its function deteriorates at an early stage. Then, this invention aims at providing the double pipe which can eliminate each said problem.
【０００９】[0009]
【課題を解決するための手段】本発明は上記の問題を解
決するために請求項１記載の発明は内外管（１）（２）
の間隙（３）に緩衝支持部材（４）を挟持した二重管に
おいて、内管（１）と外管（２）の少なくとも一方の管
に管軸方向に所定の間隔を保って２列の突起部（５）
（６）をその係止面を内外管の間隙側に存在させて形成
し、該２列の突起部（５）（６）間に上記緩衝支持部材
（４）を配置し、かつ上記２列の突起部（５）（６）の
管軸方向の配置距離（Ｌ1 ）を緩衝支持部材の管軸方向
の幅（Ｌ2）よりも長く設定したことを特徴とするもの
である。SUMMARY OF THE INVENTION In order to solve the above problems, the present invention according to claim 1 provides an inner and outer pipe (1) (2).
In the double pipe in which the buffer support member (4) is sandwiched in the gap (3) of the two pipes, at least one of the inner pipe (1) and the outer pipe (2) is arranged in two rows with a predetermined gap in the pipe axial direction. Protrusion (5)
(6) is formed such that its locking surface is present on the gap side of the inner and outer tubes, the buffer support member (4) is arranged between the two rows of protrusions (5), (6), and the two rows are formed. This is characterized in that the arrangement distance (L 1 ) of the protrusions (5) and (6) in the tube axis direction is set to be longer than the width (L 2 ) of the cushioning support member in the tube axis direction.
【００１０】請求項２記載の発明は、請求項１記載の突
起部（５）（６）の管軸方向の配置距離（Ｌ1 ）を緩衝
支持部材（４）の管軸方向の幅（Ｌ2 ）の２倍以上に設
定したことを特徴とするものである。According to a second aspect of the invention, the arrangement distance (L 1 ) of the protrusions (5) and (6) in the pipe axis direction according to the first aspect is set to the width (L) of the cushioning support member (4) in the pipe axis direction. It is characterized in that it is set to more than twice the value of 2 ).
【００１１】請求項３記載の発明は請求項１又は２記載
の２列の突起部（５）（６）を外管（１）の管壁を間隙
（３）側へ折曲して形成したことを特徴とするものであ
る。According to a third aspect of the present invention, the two rows of protrusions (5) and (6) according to the first or second aspect are formed by bending the tube wall of the outer tube (1) toward the gap (3). It is characterized by that.
【００１２】[0012]
【作用】請求項１記載の発明においては、緩衝支持部材
（４）が内管（１）及び外管（２）に対して管軸方向に
移動可能に配置されているので、緩衝支持部材（４）の
内管側接触部と外管側接触部のいずれか一方が強く接触
してその管軸方向の移動が拘束されても、他方の接触部
側が自由に移動できる。そのため、上記の状態で内外管
の熱膨張或いは振動によって内外管が相反する方向に移
動した場合でも、緩衝支持部材（４）にねじり応力が作
用せず、緩衝支持部材（４）の劣化（へたり）が起こり
難くなる。According to the first aspect of the invention, since the buffer support member (4) is arranged so as to be movable in the tube axial direction with respect to the inner pipe (1) and the outer pipe (2), the buffer support member (4 Even if either one of the inner pipe side contact portion and the outer pipe side contact portion of 4) strongly contacts and the movement in the pipe axis direction is restricted, the other contact portion side can freely move. Therefore, even when the inner and outer pipes move in opposite directions due to thermal expansion or vibration of the inner and outer pipes in the above-described state, torsional stress does not act on the buffer support member (4), and the deterioration of the buffer support member (4) occurs. Is difficult to occur.
【００１３】また、間隙（３）内に配置された緩衝支持
部材（４）は、両突起部（５）（６）によって、通常の
使用状態によってはその管外への外脱が阻止される。請
求項２記載の発明においては、突起部（５）（６）の管
軸対向の配置距離（Ｌ1 ）が緩衝支持部材（４）の幅
（Ｌ2 ）の２倍以上あれば、二重管の熱膨張、収縮や振
動による緩衝支持部材（４）の移動に充分であり、上記
の作用が有効に行なわれる。Further, the cushioning support member (4) arranged in the gap (3) is prevented from being detached from the outside of the tube by the projections (5) and (6) depending on a normal use condition. In the invention according to claim 2, when the protrusion (5) (6) has an arrangement distance (L 1 ) opposite to the tube axis of at least twice the width (L 2 ) of the buffer support member (4), the double It is sufficient for the buffer support member (4) to move due to the thermal expansion, contraction and vibration of the tube, and the above-mentioned action is effectively performed.
【００１４】請求項３記載の発明においては、内外管
（１）、（２）の間隙（３）内に緩衝支持部材（４）を
配置してその二重管を曲げ加工した後に、両突起部（５
ａ）、（５ｂ）を外管（１）の外部から押し曲げ形成で
きる。According to the third aspect of the present invention, after the buffer support member (4) is arranged in the gap (3) between the inner and outer tubes (1) and (2) and the double tube is bent, both projections are formed. Division (5
It is possible to press and form a) and (5b) from the outside of the outer tube (1).
【００１５】[0015]
【実施例】次に図１乃至図３に示す本発明の第１実施例
について説明する。図１は自動車の二重排気管に本発明
を適用した図で上半面を断面とし下半面を側面とした図
である。図２は図１のＣ−Ｃ線断面図である。EXAMPLE A first example of the present invention shown in FIGS. 1 to 3 will be described below. FIG. 1 is a view in which the present invention is applied to a double exhaust pipe of an automobile, in which an upper half surface is a cross section and a lower half surface is a side surface. 2 is a sectional view taken along the line CC of FIG.
【００１６】この図において、１は円筒状の内管、２は
円筒状の外管で、夫々の一端はフランジ１０に溶接固定
されている。外管２の内径φ1 は内管１の外径φ2 より
も大径に形成され、これらの間に所定の寸法Ｄの間隙３
が形成されている。該間隙３は両管１，２の周方向の全
周に亘る環状に形成されている。In the figure, 1 is a cylindrical inner tube, 2 is a cylindrical outer tube, and one end of each is welded and fixed to a flange 10. The inner diameter φ 1 of the outer tube 2 is formed to be larger than the outer diameter φ 2 of the inner tube 1, and a gap 3 having a predetermined dimension D is formed between them.
Are formed. The gap 3 is formed in an annular shape around the entire circumference of the pipes 1 and 2.
【００１７】４は環状に形成された緩衝支持部材で、そ
の内周面が上記内管１の外周面に軽く圧入され、外周面
が上記外管２における内周面に軽く圧入される径に設定
されて上記隙間３内に軽く圧入設置されている。また、
該緩衝支持部材４としては、上記内外管の相互間の衝撃
伝達を緩和する部材、例えばワイヤネットリング（ＳＵ
Ｓワイヤ製）等を使用する。Reference numeral 4 denotes a buffer support member formed in an annular shape, the inner peripheral surface of which is lightly press-fitted into the outer peripheral surface of the inner tube 1 and the outer peripheral surface thereof is of a diameter that is lightly press-fitted into the inner peripheral surface of the outer tube 2. It is set and lightly press-fitted and installed in the gap 3. Also,
The cushioning support member 4 is a member that absorbs shock transmission between the inner and outer tubes, such as a wire net ring (SU).
S wire) etc. are used.
【００１８】５及び６は上記内管１に２列状態に形成し
た突起部で、その管壁を外方へ折曲隆起して、管外径よ
り外方へ突出させている。Numerals 5 and 6 are projections formed on the inner pipe 1 in two rows, the pipe walls of which are bent and bulged outward so as to project outward from the outer diameter of the pipe.
【００１９】上記一方の突起部５は、図２に示すよう
に、内管１の周方向に部分的に形成されている。すなわ
ち、周方向における４５°の角度θ内に１個の突起部５
が図のように配置され、全周において計８個の突起部５
が等間隔に配置されている。また、他方の突起部６も上
記の一方の突起部５と同様に形成されている。As shown in FIG. 2, the one projection 5 is partially formed in the circumferential direction of the inner pipe 1. That is, one protrusion 5 is included within an angle θ of 45 ° in the circumferential direction.
Are arranged as shown in the figure, and there are a total of eight protrusions 5 on the entire circumference.
Are evenly spaced. The other protrusion 6 is also formed in the same manner as the one protrusion 5 described above.
【００２０】上記両突起部５、６の外方への突出量は、
該突起部５、６の頂部と外管１の内面との隙間から緩衝
支持部材４を圧入でき、かつ圧入された緩衝支持部材４
がみだりに突起部５、６を乗り越えて外脱しない寸法に
設定されている。例えば、内管１の外径φ2 が約５４ｍ
ｍで外管２の外径が約６５ｍｍのものを使用した場合に
は、突起部５、６の突出量が約４ｍｍで、突起部５、６
の頂部と外管２における嵌合部２ａの内面との隙間を約
７ｍｍとする。The amount of outward protrusion of both of the protrusions 5 and 6 is
The buffer support member 4 can be press-fitted through the gap between the tops of the projections 5 and 6 and the inner surface of the outer tube 1, and the buffer support member 4 is press-fitted.
The size is set so that the protrusions 5 and 6 do not get over and are not detached. For example, the outer diameter φ 2 of the inner tube 1 is about 54 m
When the outer tube 2 having an outer diameter of about 65 mm is used, the protrusion amount of the protrusions 5 and 6 is about 4 mm, and the protrusions 5 and 6 are
The gap between the top of the and the inner surface of the fitting portion 2a of the outer tube 2 is about 7 mm.
【００２１】更に上記両突起部５、６は内管１の軸方向
に所定の距離Ｌ1 を隔てて配設されている。この距離Ｌ
1 は上記緩衝支持部材４の軸方向の幅Ｌ2 より大きく設
定されており、両突起５と６の間において緩衝支持部材
４が両突起部５、６に当たることなく軸方向に所定の範
囲にわたって移動できるようになっている。この幅Ｌ 1
は緩衝支持部材４の幅Ｌ2 より２倍以上が望ましく、例
えば上記の各寸法のものにおいて、緩衝支持部材４の幅
Ｌ2 が１０ｍｍの場合はＬ1 を３５ｍｍに設定する。Further, the both projections 5 and 6 are arranged in the axial direction of the inner pipe 1.
A predetermined distance L1Are separated from each other. This distance L
1Is the axial width L of the buffer support member 42Set larger
The cushioning support member between the protrusions 5 and 6
4 does not hit both protrusions 5 and 6 and the axial direction
It is possible to move around the fence. This width L 1
Is the width L of the buffer support member 42More than twice is desirable, for example
For example, in each of the above dimensions, the width of the buffer support member 4
L2L is 10 mm1Is set to 35 mm.
【００２２】図中１１は下流側の管で、上記外管２の他
端に溶接固定されている。次に上記実施例の作用につい
て説明する。図１に示す内外管１、２の間隙３内に緩衝
支持部材４を挿入設置するには、その緩衝支持部材４を
間隙３の開口端７から押し込む。これにより、緩衝支持
部材４はこれが弾性力を有することにより、突起部５を
乗り越え、両突起部５、６間に挿入設置される。Reference numeral 11 in the drawing denotes a downstream pipe, which is welded and fixed to the other end of the outer pipe 2. Next, the operation of the above embodiment will be described. To insert and install the buffer support member 4 into the gap 3 between the inner and outer tubes 1 and 2 shown in FIG. 1, the buffer support member 4 is pushed in from the open end 7 of the gap 3. As a result, the cushioning support member 4 has an elastic force, so that the cushioning support member 4 gets over the protrusion 5 and is inserted and installed between the protrusions 5 and 6.
【００２３】次に内管１内を流通する排気によって内管
１と外管２が加熱された場合には、内管１が外管２より
も高温に加熱され、その熱膨張差により、緩衝支持部材
４が位置する部分の内外管１、２は図３に示すように相
対的に矢印Ａ方向と矢印Ｂ方向に移動する。Next, when the inner pipe 1 and the outer pipe 2 are heated by the exhaust gas flowing through the inner pipe 1, the inner pipe 1 is heated to a temperature higher than that of the outer pipe 2, and the inner pipe 1 and the outer pipe 2 are buffered by the difference in their thermal expansion. The inner and outer tubes 1 and 2 in the portion where the support member 4 is located relatively move in the arrow A and arrow B directions as shown in FIG.
【００２４】このとき、前記のように内外管１、２が相
互に偏心しているか或いはその他の原因によって、図３
で示すように緩衝支持部材４の上側の外周面と外管１の
内周面とが強く接触してその接触部８の摩擦抵抗力が大
きく、また緩衝支持部材４の内周面と内管１とに若干の
隙間を有するかその接触が弱い場合には、緩衝支持部材
４は外管２に対しては追従移動し、内管１に対しては突
起部５、６の設置間隔Ｌ1 が緩衝支持部材４の幅Ｌ2 よ
り広く設定されているので、突起部５、６に拘束される
ことなく軸方向へ自由に移動する。At this time, the inner and outer pipes 1 and 2 are eccentric to each other as described above, or due to other causes, as shown in FIG.
The outer peripheral surface on the upper side of the buffer support member 4 and the inner peripheral surface of the outer pipe 1 are in strong contact with each other, so that the frictional resistance of the contact portion 8 is large, and the inner peripheral surface of the buffer support member 4 and the inner pipe are When there is a slight gap with respect to 1 or the contact is weak, the buffer support member 4 moves following the outer tube 2 and the installation interval L 1 of the protrusions 5 and 6 with respect to the inner tube 1. Is set to be wider than the width L 2 of the buffer support member 4, so that the buffer support member 4 is free to move in the axial direction without being restricted by the protrusions 5 and 6.
【００２５】したがって、緩衝支持部材４は図３に示す
ように、ねじられることなく変位し、その内部にはねじ
り応力が発生しない。また冷却時には緩衝支持部材４が
内管１と摺動して元状位置へ戻る。Therefore, as shown in FIG. 3, the buffer support member 4 is displaced without being twisted, and no torsional stress is generated therein. Further, during cooling, the buffer support member 4 slides on the inner pipe 1 and returns to the original position.
【００２６】また、上記とは逆に、緩衝支持部材４と内
管１とが強く接触し、外管２とが弱く接触した場合も、
緩衝支持部材４は軸方向に摺動でき、ねじり応力は発生
しない。On the contrary to the above, when the buffer support member 4 and the inner tube 1 are in strong contact with each other and the outer tube 2 is in weak contact with each other,
The buffer support member 4 can slide in the axial direction, and no torsion stress is generated.
【００２７】そのため、緩衝支持部材４はねじり応力に
よる劣化（へたり）が起こり難くなる。また、上記のよ
うに挿入された緩衝支持部材４は、上記のような熱膨張
や熱収縮或いは内外管１、２が軸方向に振動することに
より、内外管１、２が、矢印Ａ方向とＢ方向に相対的に
移動した場合に、上記のように挿入設置された緩衝支持
部材４がその初期位置よりずれても、両突起５、６の存
在により、管から外脱することが防止される。Therefore, the buffer support member 4 is less likely to be deteriorated (settled) due to the torsional stress. Further, in the cushioning support member 4 inserted as described above, the inner and outer tubes 1 and 2 are moved in the direction of the arrow A by the thermal expansion and thermal contraction or the inner and outer tubes 1 and 2 vibrating in the axial direction as described above. Even if the cushioning support member 4 inserted and installed as described above is displaced from its initial position when it moves relatively in the B direction, the presence of both protrusions 5 and 6 prevents the cushion support member 4 from coming off from the pipe. It
【００２８】図４は本発明の第２実施例を示す。この第
２実施例は、上記第１実施例の両突起部５、６と同様の
突起部５ａ、６ａを外管２側において内周面側に突出し
て形成したものである。その突起５ａ、６ａの形状、配
置状態は上記第１実施例と同様である。FIG. 4 shows a second embodiment of the present invention. In the second embodiment, the same protrusions 5a and 6a as the protrusions 5 and 6 of the first embodiment are formed so as to protrude toward the inner peripheral surface on the outer tube 2 side. The shape and arrangement of the protrusions 5a and 6a are the same as those in the first embodiment.
【００２９】本第２実施例においても緩衝支持部材４の
軸方向への移動が可能で上記第１実施例と同様の作用、
効果を発揮する。更に本第２実施例によれば、緩衝支持
部材４を挿入してその内外二重管を曲げ加工した後に両
突起部５ａ、６ａを外部から押し曲げ形成することがで
きる。Also in the second embodiment, the buffer support member 4 can be moved in the axial direction, and the same operation as in the first embodiment,
Be effective. Furthermore, according to the second embodiment, after the cushioning support member 4 is inserted and the inner and outer double pipes are bent, both the projecting portions 5a and 6a can be pressed and formed from the outside.
【００３０】図５は本発明の第３実施例を示す。この第
３実施例は、外管１に、外方へ突出する凹状の収納室９
を全周に亘って形成するとともにその収納室９の軸方向
長を緩衝支持部材４の幅寸法Ｌ2 に対して上記第１実施
例と同様の寸法Ｌ2 とし、該収納室９の軸方向両端に突
起部５ｂ、６ｂを形成したものである。本第３実施例に
おいても、緩衝支持部材４の軸方向への移動が可能で、
上記第１実施例と同様の作用、効果を発揮する。FIG. 5 shows a third embodiment of the present invention. In the third embodiment, the outer tube 1 has a concave storage chamber 9 protruding outward.
Is formed over the entire circumference, and the axial length of the storage chamber 9 is set to the same dimension L 2 as the first embodiment with respect to the width dimension L 2 of the buffer support member 4, and the axial direction of the storage chamber 9 is defined. The protrusions 5b and 6b are formed on both ends. Also in the third embodiment, the buffer support member 4 can be moved in the axial direction,
The same action and effect as those of the first embodiment are exhibited.
【００３１】図６は本発明の第４実施例を示す。この第
４実施例は、内管１に、上記実施例の突起部５と同様の
突起部５ｃを外方へ突出形成し、外管２に、上記突起部
６と同様の突起部６ｃを内方へ突出形成し、これら両突
起部５ｃと６ｃの軸方向間隔の寸法Ｌ1 を、緩衝支持部
材４の幅寸法Ｌ2 に対して上記第１実施例と同様の寸法
Ｌ1 としたものである。この両突起部５ｃ、６ｃの周方
向の形状は上記第１実施例と同様である。本第４実施例
においても緩衝支持部材４の軸方向への移動が可能で、
上記第１実施例と同様の作用、効果を発揮する。FIG. 6 shows a fourth embodiment of the present invention. In the fourth embodiment, a projection 5c similar to the projection 5 of the above embodiment is formed on the inner tube 1 so as to project outward, and a projection 6c similar to the projection 6 is formed inside the outer tube 2. projecting form toward, those dimensions L 1 of the axial spacing of both projections 5c and 6c, and a cushioning support member width L dimension L 1 of the same as the first embodiment with respect to the second 4 is there. The circumferential shapes of the two protrusions 5c and 6c are the same as those in the first embodiment. Also in the fourth embodiment, the buffer support member 4 can be moved in the axial direction,
The same action and effect as those of the first embodiment are exhibited.
【００３２】[0032]
【発明の効果】以上のようであるから請求項１記載の発
明によれば、熱膨張差等に起因して内外管相互に管軸方
向へのズレが発生しても、内外管内に挟持された緩衝支
持部材にねじり応力が作用せず、その緩衝支持部材の劣
化（ヘタリ）が起こり難くなる。また、その緩衝部材の
管外への外脱も防止できる。更に緩衝支持部材を溶接で
固定しないので、前記従来の溶接固定にみられた問題を
解消できる。As described above, according to the first aspect of the present invention, even if the inner and outer tubes are displaced from each other in the tube axis direction due to a difference in thermal expansion, etc., they are sandwiched in the inner and outer tubes. The torsional stress does not act on the cushioning support member, and deterioration (settling) of the cushioning support member is less likely to occur. Further, it is possible to prevent the cushioning member from being detached from the pipe. Further, since the buffer support member is not fixed by welding, the problems found in the conventional welding and fixing can be solved.
【００３３】請求項２記載の発明によれば、緩衝支持部
材の移動が確実に行なえる。更に請求項３記載の発明に
よれば、内外管の間隙に緩衝支持部材を配置してその二
重管を曲げ加工した後に両突起部を形成でき、製造が容
易に行なえる。According to the second aspect of the present invention, the buffer support member can be reliably moved. Further, according to the third aspect of the invention, both the protrusions can be formed after the buffer support member is arranged in the gap between the inner and outer tubes and the double tube is bent, so that the manufacturing can be easily performed.
【図１】本発明の第１実施例を示すもので上半面を断面
とし、下半面を側面とした図。FIG. 1 is a view showing a first embodiment of the present invention in which an upper half surface is a cross section and a lower half surface is a side surface.
【図２】図１におけるＣ−Ｃ線断面図。FIG. 2 is a cross-sectional view taken along the line CC in FIG.
【図３】図１の実施例の作用を説明する側断面図。FIG. 3 is a side sectional view for explaining the operation of the embodiment shown in FIG.
【図４】本発明の第２実施例を示す要部側断面図。FIG. 4 is a side sectional view of a main part showing a second embodiment of the present invention.
【図５】本発明の第３実施例を示す要部側断面図。FIG. 5 is a side sectional view of an essential part showing a third embodiment of the present invention.
【図６】本発明の第４実施例を示す要部側断面図。FIG. 6 is a side sectional view of a main part showing a fourth embodiment of the present invention.
【図７】従来構造の第１例を示す側断面図。FIG. 7 is a side sectional view showing a first example of a conventional structure.
【図８】従来構造の第２例を示す側断面図。FIG. 8 is a side sectional view showing a second example of the conventional structure.
【図９】従来構造の第３例を示す側断面図。FIG. 9 is a side sectional view showing a third example of the conventional structure.
【図１０】図９のものにおける作用を説明する図で、
（ａ）は正断面図、（ｂ）は側断面図である。FIG. 10 is a diagram for explaining the operation in FIG. 9,
(A) is a front sectional view, (b) is a side sectional view.
１…内管 ２…外管 ３…間隙 ４…緩衝支持部
材 ５、６…突起部 Ｌ1 …両突起部間の距離 Ｌ2 …緩衝支持部材の幅1 ... inner tube 2 ... outer tube 3 ... gap 4 ... cushioning support members 5, 6 ... protrusion L 1 ... width of a distance L 2 ... shock-absorbing member between the protrusions
Claims (3)
二重管において、内管と外管の少なくとも一方の管に管
軸方向に所定の間隔を保って２列の突起部をその係止面
を内外管の間隙側に存在させて形成し、該２列の突起部
間に上記緩衝支持部材を配置し、かつ上記２列の突起部
の管軸方向の配置距離を緩衝支持部材の管軸方向の幅よ
りも長く設定したことを特徴とする二重管。1. A double pipe having a buffer support member sandwiched in a gap between the inner and outer pipes, and at least one of the inner pipe and the outer pipe is provided with two rows of protrusions at a predetermined interval in the pipe axial direction. The stopper surface is formed so as to be present on the gap side of the inner and outer pipes, the buffer support member is disposed between the two rows of protrusions, and the distance between the two rows of protrusions in the tube axis direction is set to the buffer support member. A double pipe characterized by being set longer than the width in the pipe axis direction.
距離を緩衝支持部材の管軸方向の幅の２倍以上に設定し
たことを特徴とする二重管。2. A double pipe, wherein the disposition distance of the protrusion in the pipe axial direction according to claim 1 is set to be at least twice the width of the cushioning support member in the pipe axial direction.
管の管壁を間隙側へ折曲して形成したことを特徴とする
二重管。3. A double pipe, wherein the two rows of projections according to claim 1 or 2 are formed by bending the pipe wall of the outer pipe toward the gap side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30333194A JPH08159343A (en) | 1994-12-07 | 1994-12-07 | Duplex pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30333194A JPH08159343A (en) | 1994-12-07 | 1994-12-07 | Duplex pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08159343A true JPH08159343A (en) | 1996-06-21 |
Family
ID=17919695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30333194A Pending JPH08159343A (en) | 1994-12-07 | 1994-12-07 | Duplex pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08159343A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001221939A (en) * | 2000-02-08 | 2001-08-17 | Nikon Corp | Lens barrel |
| JP2005004181A (en) * | 2003-05-21 | 2005-01-06 | Fujinon Corp | Visible light/infrared light photographing lens system |
| JP2011208665A (en) * | 2010-03-29 | 2011-10-20 | Ckd Corp | Vacuum double pipe, and connected structure of the same |
| KR101420811B1 (en) * | 2014-04-16 | 2014-07-17 | 이세창 | Improved water pipe connection structure for maintenance |
| JP2021044229A (en) * | 2019-09-13 | 2021-03-18 | ウシオ電機株式会社 | Light radiation device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5292123A (en) * | 1976-01-29 | 1977-08-03 | Nippon Kokan Kk <Nkk> | Parting construction for pipe line with double tube construction |
-
1994
- 1994-12-07 JP JP30333194A patent/JPH08159343A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5292123A (en) * | 1976-01-29 | 1977-08-03 | Nippon Kokan Kk <Nkk> | Parting construction for pipe line with double tube construction |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001221939A (en) * | 2000-02-08 | 2001-08-17 | Nikon Corp | Lens barrel |
| JP2005004181A (en) * | 2003-05-21 | 2005-01-06 | Fujinon Corp | Visible light/infrared light photographing lens system |
| JP2011208665A (en) * | 2010-03-29 | 2011-10-20 | Ckd Corp | Vacuum double pipe, and connected structure of the same |
| KR101420811B1 (en) * | 2014-04-16 | 2014-07-17 | 이세창 | Improved water pipe connection structure for maintenance |
| JP2021044229A (en) * | 2019-09-13 | 2021-03-18 | ウシオ電機株式会社 | Light radiation device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7264280B2 (en) | Flexible tube for an exhaust pipe of an automobile | |
| KR100353123B1 (en) | Exhaust pipe decoupler for automobiles | |
| EP1326043B1 (en) | Flexible tube | |
| US5437479A (en) | Flexible connection arrangement for the two pipe portions particularly for motor vehicle exhausts | |
| US4250708A (en) | Exhaust double pipe of an internal combustion engine | |
| KR20000008987A (en) | Flexible tube for car exhaust tube | |
| US4397817A (en) | Catalytic converter | |
| JP2008088954A (en) | Exhaust pipe connecting device | |
| KR20010049258A (en) | Flexible coupler apparatus | |
| JPH08159343A (en) | Duplex pipe | |
| US20060017285A1 (en) | Flexible tube for an exhaust pipe of an automobile | |
| JP3752005B2 (en) | Device for movably coupling conduit ends | |
| US4185463A (en) | Exhaust double pipe of an internal combustion engine | |
| JP3138394B2 (en) | Vacuum double bellows pipe | |
| JP4026609B2 (en) | Cylindrical dynamic damper | |
| JP3250454B2 (en) | Double pipe | |
| KR100457210B1 (en) | Exhaust pipe decoupler for vehicles | |
| KR100492081B1 (en) | Flexible Tube For Vehicle Exhaust Pipe | |
| JP3049050U (en) | Flexible pipe | |
| KR101732926B1 (en) | Flexible tube of exhaust pipe for vehicle | |
| KR960006036Y1 (en) | Connecting device for exhaust gas pipe | |
| JPH08218860A (en) | Double exhaust pipe | |
| KR200150355Y1 (en) | Decoupler for exhaust pipe of a car | |
| KR100361078B1 (en) | Decoupler for exhaust pipe of an automobil | |
| KR200243764Y1 (en) | Flexible coupling for an exhaust pipe of an automobile |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 19961001 |