JP5989369B2 - Flexible pipe fittings - Google Patents

Flexible pipe fittings Download PDF

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JP5989369B2
JP5989369B2 JP2012065117A JP2012065117A JP5989369B2 JP 5989369 B2 JP5989369 B2 JP 5989369B2 JP 2012065117 A JP2012065117 A JP 2012065117A JP 2012065117 A JP2012065117 A JP 2012065117A JP 5989369 B2 JP5989369 B2 JP 5989369B2
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flange
bellows tube
joint body
split
diameter portion
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JP2013194877A (en
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林　兼芳
兼芳 林
林　茂吉
茂吉 林
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Sankei Giken Co Ltd
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Description

本発明は、ステンレス鋼等の耐蝕金属製の蛇腹管とゴム製の継手本体とからなる複合可撓性管継手に関する。   The present invention relates to a composite flexible pipe joint comprising a corrugated pipe made of corrosion-resistant metal such as stainless steel and a rubber joint body.

腐蝕性の薬品等が内部を流通する可撓性管継手には、ステンレス製のフレキシブルチューブが従来用いられていた。これは両端部にフランジ部を有するステンレス製蛇腹管の外周にステンレス製の網を被着したものである。
また、下記特許文献１として、ベローズ状金属管の外周にゴム層を埋設し、内部に螺旋状の補強層を設けたものが提案されている。これは、ベローズ状金属管の外周の谷部にゴム層が埋設されたものであり、また、可撓性管継手の軸方向の端に割リングが配置され、その小径側がベローズ状金属管の端部に嵌入して係止されている。そして、割リングを相フランジに接合して離れないようにしてある。さらに、ベローズ状金属管の端部をその割リングから突出させ、そこにガスケットを着脱自在に配置するものである。 Conventionally, a flexible tube made of stainless steel has been used for a flexible pipe joint through which corrosive chemicals and the like circulate. This is a stainless steel bellows tube having flanges at both ends, and a stainless steel net is attached to the outer periphery.
Further, as Patent Document 1 below, a structure in which a rubber layer is embedded in the outer periphery of a bellows-like metal tube and a spiral reinforcing layer is provided inside is proposed. This is a rubber layer embedded in the valley of the outer periphery of the bellows-shaped metal tube, and a split ring is disposed at the axial end of the flexible pipe joint, and the smaller diameter side of the bellows-shaped metal tube is It fits into the end and is locked. The split ring is joined to the companion flange so as not to be separated. Further, the end of the bellows-like metal tube is projected from the split ring, and a gasket is detachably disposed there.

特開２００１−１５９４７８号公報JP 2001-159478 A

ステンレス製蛇腹管の外周に金属網を被着した可撓性管継手は、繰り返しの屈曲強度が低いことが判った。即ち、繰り返し荷重をその半径方向に加えると、比較的短時間に外周の金網が損傷する。また、金網が外側からの腐蝕に弱い欠点があった。
上記特許文献１の可撓性管継手は、ベローズ状金属管の外周の谷部にゴム層が埋設されたものであるので、本発明者の実験によれば、半径方向への可撓性が殆どないことが判った。
また、ベローズ状金属管の端部をその割リングから突出させ、そこにガスケットを着脱自在に配置するものであるため、ベローズ状金属管の軸方向端部が露出し、そこに腐食性物質が堆積する虞がある。
そこで本発明は、屈曲性及びその耐久性が高く、継手外周からの腐食性物質の浸入を防止し且つ、液密性が高く取り扱い易い可撓性管継手を提供することを課題とする。 It has been found that a flexible pipe joint in which a metal net is attached to the outer periphery of a stainless steel bellows pipe has low repeated bending strength. That is, when a repeated load is applied in the radial direction, the outer peripheral wire mesh is damaged in a relatively short time. In addition, there is a drawback that the wire mesh is weak against corrosion from the outside.
Since the flexible pipe joint of Patent Document 1 has a rubber layer embedded in a valley portion on the outer periphery of a bellows-like metal tube, according to the experiment of the present inventor, the flexibility in the radial direction is low. I found that there was almost no.
In addition, the end of the bellows-shaped metal tube is projected from the split ring, and the gasket is detachably disposed there, so that the end of the bellows-shaped metal tube in the axial direction is exposed and corrosive substances are present there. There is a risk of accumulation.
Therefore, an object of the present invention is to provide a flexible pipe joint that has high flexibility and durability, prevents intrusion of corrosive substances from the outer periphery of the joint, has high liquid-tightness, and is easy to handle.

請求項１に記載の本発明は、接続される管(1)のフランジ(2)に対向して、一対の鍔部(3)が両端に一体に突設され、軸線方向の略全長に渡ってタイヤコード(4)が埋設されたゴム材よりなる筒状の継手本体(5)と、
その継手本体(5)の内周面に隣接し、その軸に平行な断面が波形に形成され、その継手 本体(5)の内周との間に空間部(11)を有する耐蝕金属製の蛇腹管(7)と、
各鍔部(3)の継手本体(5)の軸方向中心側の一端面およびその外周に整合し、その半径方 向の中心側に断面Ｌ字状に環状段付き部(6b)が突設され、半径方向の外側に複数のボルト 孔(6a)を有する相フランジ(6)と、
その鍔部(3)の軸方向の端に、相フランジ(6)の端面より一体に突出したシール部(10)と 、
複数に分割された環状のプレートからなり、その半径方向外側の大径部が前記環状段付 き部(6b)に対向すると共に、半径方向の内側の小径部が前記蛇腹管(7)の軸方向の端の前 記波の谷部外周に嵌入されて、前記鍔部(3)に平行に一体に埋設された分割フランジ(8)と、
その分割フランジ(8)の大径部と、相フランジ(6)の環状段付き部(6b)との間に介装され て、内周が蛇腹管(7)の半径方向の外側に位置し、各鍔部(3)に平行に一体に埋設され、その外周を前記タイヤコード(4)が巻回する環状プレー ト(9)と、を具備し、
前記継手本体(5)の前記鍔部(3)は、その内周が蛇腹管(7)の内周に一致し、外周が前記分割フランジ(8)の直径以上の大きさに形成され、
前記分割フランジ(8)は、その大径部が前記環状プレート(9)に前記タイヤコード(4)を介して鍔部(3)内で近接されると共に、小径部が蛇腹管(7)の端部の半サイクル内で前記ゴム材に抱持され、
前記蛇腹管(7)の軸方向の先端の波の少なくとも半サイクル分が軸方向に潰されて、そこに補強部(12)が形成されると共に、その補強部(12)が前記鍔部(3)の前記ゴム材に埋設され、
前記分割フランジ(8)は、その大径部が前記鍔部(3)と環状プレート(9)とに挟持されると共に、小径部が鍔部(3)の補強部(12)と蛇腹管(7)の端部の谷部のゴム材との間に支持された可撓性管継手である。 In the first aspect of the present invention, a pair of flanges (3) project integrally from both ends so as to face the flange (2) of the pipe (1) to be connected, and extend over substantially the entire length in the axial direction. A tubular joint body (5) made of a rubber material in which the tire cord (4) is embedded,
It is made of a corrosion-resistant metal that is adjacent to the inner peripheral surface of the joint body (5) and has a corrugated cross section parallel to the axis, and has a space (11) between the inner periphery of the joint body (5). A bellows tube (7),
Each flange part (3) is aligned with the end face on the axial center side of the joint body (5) and its outer periphery, and an annular stepped part (6b) is projected in the shape of an L-shaped cross section on the center side in the radial direction. A companion flange (6) having a plurality of bolt holes (6a) radially outward;
A seal portion (10) integrally projecting from the end face of the companion flange (6) at the axial end of the flange portion (3);
It consists of an annular plate divided into a plurality, and the large-diameter portion on the radially outer side faces the annular stepped portion (6b), and the small-diameter portion on the radially inner side is the shaft of the bellows tube (7). A split flange (8) that is fitted in the outer periphery of the trough portion of the wave at the end of the direction and embedded integrally in parallel with the flange portion (3);
It is interposed between the large-diameter portion of the split flange (8) and the annular stepped portion (6b) of the companion flange (6), and the inner circumference is located outside the bellows tube (7) in the radial direction. are embedded parallel to the integrally to each flange portion (3), comprising the outer circumference the tire cord (4) is an annular plates of winding (9), and
The flange portion (3) of the joint body (5) has an inner circumference that coincides with an inner circumference of the bellows tube (7), and an outer circumference is formed with a size equal to or larger than the diameter of the split flange (8),
The split flange (8) has a large-diameter portion thereof close to the annular plate (9) in the flange portion (3) via the tire cord (4), and a small-diameter portion of the bellows tube (7). Held in the rubber material within a half cycle at the end,
At least half a cycle of the wave at the tip of the bellows tube (7) in the axial direction is crushed in the axial direction, and a reinforcing portion (12) is formed there, and the reinforcing portion (12) is the flange ( Embedded in the rubber material of 3),
The split flange (8) has a large-diameter portion sandwiched between the flange portion (3) and the annular plate (9), and a small-diameter portion is a reinforcing portion (12) of the flange portion (3) and a bellows tube ( It is a flexible pipe joint supported between the rubber material of the trough part of the edge part of 7) .

本発明の可撓性管継手は、分割フランジ８および環状プレート９が、それぞれ鍔部に平行に埋設され、その環状プレート９は蛇腹管７の半径方向外側に位置し、分割フランジ８の小径部が蛇腹管７の谷部に嵌着する。
そして、分割フランジ８は、その小径部が鍔部３の補強部１２と蛇腹管７の端部の谷部のゴム材との間に支持され、大径部が前記鍔部３と環状プレート９とに挟持されたものである。
そのため、複数に分割された分割フランジは、その小径部が蛇腹管７内でゴム材と一体に強固になって支持されることになり、継手本体に加わる外力に対して変形することがない。また分割フランジの大径部は、それに平行に且つ近接して埋設された環状プレート９と鍔部３との間に支持され、その環状プレート９と共に、軸方向に加わる外力を支持できる。
また、蛇腹管７の軸方向の端部の補強部１２はゴム材からなる鍔部３に埋設されているため、耐蝕性を保持することができる。
また、分割フランジ８の大径部と、相フランジ６の環状段付き部6bとの間に環状プレー ト９が配置され、それが鍔部３に一体に埋設され且つ、その外周をタイヤコード４が巻回 する。そのため、そのタイヤコード４により蛇腹管７の伸張を抑制して、安定した継手構造を形成できる。即ち、蛇腹管７の過度な伸張を抑制して、その蛇腹管７の損傷を防ぐ。
また、その抑制効果は外力により鍔部３が管１のフランジ２から外れるのを防止できる。
さらには、継手本体５の内周と蛇腹管７との間には空間部11が形成されているため、全体の可撓性を維持し、耐震と防振効果を保持する。
また、鍔部３の軸方向の端に、相フランジ６の端面より一体に突出したシール部10を有 し且つ、外周の継手本体５の存在により、継手の外面側からの腐食を効果的に抑制すると共に液密性を確保する。 In the flexible pipe joint of the present invention, the split flange 8 and the annular plate 9 are respectively embedded in parallel to the flange portion, and the annular plate 9 is located on the radially outer side of the bellows tube 7. Fits into the valley of the bellows tube 7.
The split flange 8 has a small-diameter portion supported between the reinforcing portion 12 of the flange portion 3 and the rubber material at the valley portion at the end of the bellows tube 7, and a large-diameter portion of the flange portion 3 and the annular plate 9. It is sandwiched between.
For this reason, the divided flange divided into a plurality of parts has a small diameter portion that is firmly supported by the rubber material within the bellows tube 7 and is supported, and is not deformed by an external force applied to the joint body. The large-diameter portion of the split flange is supported between the annular plate 9 and the flange 3 that are embedded in parallel and close to each other, and can support the external force applied in the axial direction together with the annular plate 9.
Moreover, since the reinforcement part 12 of the axial direction edge part of the bellows tube 7 is embed | buried under the collar part 3 which consists of rubber materials, corrosion resistance can be hold | maintained.
An annular plate 9 is disposed between the large-diameter portion of the split flange 8 and the annular stepped portion 6b of the companion flange 6. The annular plate 9 is integrally embedded in the flange portion 3, and the outer periphery of the annular plate 9 is embedded in the tire cord 4. Is wound. Therefore, the tire cord 4 can suppress the expansion of the bellows tube 7 and form a stable joint structure. That is, excessive expansion of the bellows tube 7 is suppressed, and damage to the bellows tube 7 is prevented.
Moreover, the suppression effect can prevent that the collar part 3 remove | deviates from the flange 2 of the pipe | tube 1 by external force.
Furthermore, since the space part 11 is formed between the inner periphery of the joint main body 5 and the bellows tube 7, the flexibility of the whole is maintained, and the anti-seismic and anti-vibration effects are maintained.
In addition, a seal portion 10 projecting integrally from the end face of the companion flange 6 is provided at the end of the flange portion 3 in the axial direction, and the presence of the outer joint body 5 effectively prevents corrosion from the outer surface side of the joint. Suppresses and secures liquid tightness.

本発明の可撓性管継手の要部断面図。Sectional drawing of the principal part of the flexible pipe joint of this invention. 同可撓性管継手の一部破断面正面図。The partially broken sectional front view of the flexible pipe joint. 同可撓性管継手に内装された環状プレート９の側面図。The side view of the annular plate 9 built in the flexible pipe joint. 同分割フランジ８の側面図。The side view of the division | segmentation flange 8. FIG. 同可撓性管継手の接続状態を示す要部断面図。Sectional drawing which shows the principal part which shows the connection state of the flexible pipe joint. 同分割フランジ８の他の例を示す斜視図。The perspective view which shows the other example of the division | segmentation flange 8. FIG. 同分割フランジ８を組立てた状態を示す斜視図。The perspective view which shows the state which assembled the division | segmentation flange 8. As shown in FIG. 本発明の可撓性管継手の他の例を示す要部断面図。The principal part sectional drawing which shows the other example of the flexible pipe joint of this invention.

次に、図面に基づいて本発明の実施の形態につき説明する。
本発明の可撓性管継手は、図１〜図２に示す如く、中心側にステンレス等の耐蝕金属製の蛇腹管７が配置され、その外周にゴム材よりなる筒状の継手本体５が被着されている。そしてその蛇腹管７の外周の頂部が継手本体５の内周に接触し、その谷部には継手本体５のゴムが埋設されていない。そして、そこに空間部11が形成されている。
継手本体５の端部には鍔部３が設けられ、そこに環状プレート９と分割フランジ８とが埋設されている。 Next, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 2, the flexible pipe joint of the present invention has a bellows pipe 7 made of a corrosion-resistant metal such as stainless steel at the center side, and a cylindrical joint body 5 made of a rubber material on the outer periphery thereof. It is attached. And the top part of the outer periphery of the bellows tube 7 contacts the inner periphery of the joint main body 5, and the rubber of the joint main body 5 is not embedded in the trough part. And the space part 11 is formed there.
A flange 3 is provided at the end of the joint body 5, and an annular plate 9 and a split flange 8 are embedded therein.

環状プレート９はその内直径が蛇腹管７の外直径よりも大であり、図３の如く、環状に形成されている。環状プレート９に対向した位置に分割フランジ８が配置され、この分割フランジ８は図４の如く、この例では二分割に形成されている。分割フランジ８の内周直径は蛇腹管７の外直径よりも小さく且つ、その外周の谷部の底の直径よりも僅かに大である。そして蛇腹管７の端部が半サイクル分軸方向に潰されて補強部12を形成し、その補強部12とそれに対向する波面との間に分割フランジ８の小径部が嵌入する。そしてその分割フランジ８の軸方向端部側にシール部10が一体に形成され、分割フランジ８及び環状プレート９並びに補強部12が継手本体５内に埋設される。   The inner diameter of the annular plate 9 is larger than the outer diameter of the bellows tube 7 and is formed in an annular shape as shown in FIG. A split flange 8 is disposed at a position facing the annular plate 9, and the split flange 8 is formed in two parts in this example as shown in FIG. The inner peripheral diameter of the divided flange 8 is smaller than the outer diameter of the bellows tube 7 and slightly larger than the diameter of the bottom of the valley portion on the outer periphery. Then, the end portion of the bellows tube 7 is crushed in the axial direction by half a cycle to form the reinforcing portion 12, and the small diameter portion of the split flange 8 is inserted between the reinforcing portion 12 and the wave surface facing it. The seal portion 10 is integrally formed on the axial end portion side of the split flange 8, and the split flange 8, the annular plate 9, and the reinforcing portion 12 are embedded in the joint body 5.

この継手本体５は、その略全長に渡りタイヤコード４が埋設され、その両端部は環状プレート９の外周に懸回される。しかしながら、分割フランジ８にはタイヤコード４は懸回されない。そして、鍔部３の外周面及びその継手本体５の軸方向中心側の側面には、相フランジ６のＬ字状の環状段付き部6bが嵌着固定されている。
このような可撓性管継手を製造するには、端部に補強部12を有する蛇腹管７の外周に未加硫のゴム，タイヤコード４，環状プレート９，分割フランジ８、相フランジ６を配置すると共に、シール部10として未加硫のパッキンゴムを配置する。なお、分割フランジ８の外周に未加硫のゴムが懸回されている。
次いで、各ゴムを加硫し、それらが一体となった可撓性管継手を完成する。 The joint body 5 has a tire cord 4 embedded in substantially the entire length thereof, and both ends thereof are suspended on the outer periphery of the annular plate 9. However, the tire cord 4 is not suspended around the split flange 8. An L-shaped annular stepped portion 6 b of the companion flange 6 is fitted and fixed to the outer peripheral surface of the flange portion 3 and the side surface on the axial center side of the joint body 5.
In order to manufacture such a flexible pipe joint, unvulcanized rubber, a tire cord 4, an annular plate 9, a split flange 8, and a companion flange 6 are provided on the outer periphery of the bellows tube 7 having a reinforcing portion 12 at the end. At the same time, an unvulcanized packing rubber is disposed as the seal portion 10. An unvulcanized rubber is suspended around the outer periphery of the split flange 8.
Next, each rubber is vulcanized to complete a flexible pipe joint.

（作用）
このようにしてなる本発明の可撓性管継手は、図５に示す如く、管１のフランジ２を継手本体５のシール部10に当接し、ボルト14及びナット15を介して、相フランジ６とフランジ２との間を締結する。そしてシール部10を変形させ、継手本体５と管１との液密性を確保する。
このような管継手を有する配管の内部に、一例として加圧された液体が流通する。このとき継手本体５内にはタイヤコード４が略その全長に渡って配置されると共に、その端部が環状プレート９に懸回されている。そして、その環状プレート９と分割フランジ８とが相フランジ６と管１のフランジ２との間に締結保持されている。そのため、流通する液体の内圧が高くても、内部のタイヤコード４が可撓性管の軸方向の伸張を一定に抑制する。 (Function)
As shown in FIG. 5, the flexible pipe joint according to the present invention is configured such that the flange 2 of the pipe 1 abuts against the seal portion 10 of the joint body 5, and the phase flange 6 is connected via the bolt 14 and the nut 15. And the flange 2 are fastened. Then, the seal portion 10 is deformed to ensure the liquid tightness between the joint body 5 and the pipe 1.
As an example, pressurized liquid circulates inside the pipe having such a pipe joint. At this time, the tire cord 4 is disposed in the joint body 5 over substantially the entire length, and its end is suspended from the annular plate 9. The annular plate 9 and the split flange 8 are fastened and held between the phase flange 6 and the flange 2 of the pipe 1. Therefore, even if the internal pressure of the flowing liquid is high, the internal tire cord 4 keeps the axial expansion of the flexible tube constant.

仮に、タイヤコード４が存在しないと、内圧により継手本体５及び蛇腹管７は軸方向に容易に伸張する。その伸張に伴い、継手本体５の鍔部３が相フランジ６及びフランジ２から分離する虞がある。それを、タイヤコード４と環状プレート９と分割フランジ８とにより防止している。そして管継手は半径方向への可撓性が十分あり、その外周には耐薬品性の継手本体５が配置されているため、外面側からの腐蝕が進行することがない。
また、内面側にはステンレス等からなる耐蝕金属製の蛇腹管７が配置されているため、継手の内面側が腐蝕することも防止される。そして耐久性及び可撓性の高い管継手を提供する。 If the tire cord 4 is not present, the joint body 5 and the bellows tube 7 are easily expanded in the axial direction by the internal pressure. With the extension, the flange 3 of the joint body 5 may be separated from the companion flange 6 and the flange 2. This is prevented by the tire cord 4, the annular plate 9 and the split flange 8. The pipe joint is sufficiently flexible in the radial direction, and the chemical-resistant joint body 5 is arranged on the outer periphery thereof, so that corrosion from the outer surface side does not proceed.
Moreover, since the corrosion-resistant metal bellows tube 7 made of stainless steel or the like is disposed on the inner surface side, corrosion of the inner surface side of the joint is also prevented. And a durable and flexible pipe joint is provided.

次に、図６及び図７は分割フランジ８の他の例であり、この例の分割フランジ８は三分割され、各片の両端部に段部13が形成され、それらが互いに重ねあわされて、図７の如く組立てられる。   6 and 7 show another example of the split flange 8. The split flange 8 of this example is divided into three parts, and step portions 13 are formed at both ends of each piece, and they are overlapped with each other. 7 are assembled as shown in FIG.

次に、図８は本発明の可撓性管継手の他の例であり、この例が図１のそれと異なる点は、継手本体５の内周面が僅かに蛇腹管７の頂部及び谷部に嵌入していることである。このような状態であっても、管継手は半径方向に可撓性を十分有する。   Next, FIG. 8 shows another example of the flexible pipe joint of the present invention. This example is different from that of FIG. 1 in that the inner peripheral surface of the joint body 5 is slightly at the top and the valley of the bellows pipe 7. It is inserted in. Even in such a state, the pipe joint is sufficiently flexible in the radial direction.

１ 管
２ フランジ
３ 鍔部
４ タイヤコード
５ 継手本体
６ 相フランジ
6a ボルト孔
6b 環状段付き部 1 pipe 2 flange 3 flange 4 tire cord 5 joint body 6 companion flange
6a Bolt hole
6b Annular step

７ 蛇腹管
８ 分割フランジ
９ 環状プレート
10 シール部
11 空間部
12 補強部
13 段部
14 ボルト
15 ナット 7 bellows tube 8 split flange 9 annular plate
10 Seal part
11 Space
12 Reinforcement
13 steps
14 volts
15 nut

Claims (1)

接続される管(1)のフランジ(2)に対向して、一対の鍔部(3)が両端に一体に突設され、軸線方向の略全長に渡ってタイヤコード(4)が埋設されたゴム材よりなる筒状の継手本体(5)と、
その継手本体(5)の内周面に隣接し、その軸に平行な断面が波形に形成され、その継手 本体(5)の内周との間に空間部(11)を有する耐蝕金属製の蛇腹管(7)と、
各鍔部(3)の継手本体(5)の軸方向中心側の一端面およびその外周に整合し、その半径方 向の中心側に断面Ｌ字状に環状段付き部(6b)が突設され、半径方向の外側に複数のボルト 孔(6a)を有する相フランジ(6)と、
その鍔部(3)の軸方向の端に、相フランジ(6)の端面より一体に突出したシール部(10)と 、
複数に分割された環状のプレートからなり、その半径方向外側の大径部が前記環状段付 き部(6b)に対向すると共に、半径方向の内側の小径部が前記蛇腹管(7)の軸方向の端の前 記波の谷部外周に嵌入されて、前記鍔部(3)に平行に一体に埋設された分割フランジ(8)と、
その分割フランジ(8)の大径部と、相フランジ(6)の環状段付き部(6b)との間に介装され て、内周が蛇腹管(7)の半径方向の外側に位置し、各鍔部(3)に平行に一体に埋設され、その外周を前記タイヤコード(4)が巻回する環状プレー ト(9)と、を具備し、
前記継手本体(5)の前記鍔部(3)は、その内周が蛇腹管(7)の内周に一致し、外周が前記分割フランジ(8)の直径以上の大きさに形成され、
前記分割フランジ(8)は、その大径部が前記環状プレート(9)に前記タイヤコード(4)を介して鍔部(3)内で近接されると共に、小径部が蛇腹管(7)の端部の半サイクル内で前記ゴム材に抱持され、
前記蛇腹管(7)の軸方向の先端の波の少なくとも半サイクル分が軸方向に潰されて、そこに補強部(12)が形成されると共に、その補強部(12)が前記鍔部(3)の前記ゴム材に埋設され、
前記分割フランジ(8)は、その大径部が前記鍔部(3)と環状プレート(9)とに挟持されると共に、小径部が鍔部(3)の補強部(12)と蛇腹管(7)の端部の谷部のゴム材との間に支持された可撓性管継手。 Opposite to the flange (2) of the pipe (1) to be connected, a pair of flanges (3) are integrally projected at both ends, and the tire cord (4) is embedded over substantially the entire length in the axial direction. A cylindrical joint body (5) made of rubber material;
It is made of a corrosion-resistant metal that is adjacent to the inner peripheral surface of the joint body (5) and has a corrugated cross section parallel to the axis, and has a space (11) between the inner periphery of the joint body (5). A bellows tube (7),
Each flange part (3) is aligned with the end face on the axial center side of the joint body (5) and its outer periphery, and an annular stepped part (6b) is projected in the shape of an L-shaped cross section on the center side in the radial direction. A companion flange (6) having a plurality of bolt holes (6a) radially outward;
A seal portion (10) integrally projecting from the end face of the companion flange (6) at the axial end of the flange portion (3);
It consists of an annular plate divided into a plurality, and the large-diameter portion on the radially outer side faces the annular stepped portion (6b), and the small-diameter portion on the radially inner side is the shaft of the bellows tube (7). A split flange (8) that is fitted in the outer periphery of the trough portion of the wave at the end of the direction and embedded integrally in parallel with the flange portion (3);
It is interposed between the large-diameter portion of the split flange (8) and the annular stepped portion (6b) of the companion flange (6), and the inner circumference is located outside the bellows tube (7) in the radial direction. are embedded parallel to the integrally to each flange portion (3), comprising the outer circumference the tire cord (4) is an annular plates of winding (9), and
The flange portion (3) of the joint body (5) has an inner circumference that coincides with an inner circumference of the bellows tube (7), and an outer circumference is formed with a size equal to or larger than the diameter of the split flange (8),
The split flange (8) has a large-diameter portion thereof close to the annular plate (9) in the flange portion (3) via the tire cord (4), and a small-diameter portion of the bellows tube (7). Held in the rubber material within a half cycle at the end,
At least half a cycle of the wave at the tip of the bellows tube (7) in the axial direction is crushed in the axial direction, and a reinforcing portion (12) is formed there, and the reinforcing portion (12) is the flange ( Embedded in the rubber material of 3),
The split flange (8) has a large-diameter portion sandwiched between the flange portion (3) and the annular plate (9), and a small-diameter portion is a reinforcing portion (12) of the flange portion (3) and a bellows tube ( 7) A flexible pipe joint supported between a rubber material at a trough at the end of 7) .
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