JP4645958B2 - Manufacturing method of flexible vibration-proof joint - Google Patents

Manufacturing method of flexible vibration-proof joint Download PDF

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JP4645958B2
JP4645958B2 JP2006309676A JP2006309676A JP4645958B2 JP 4645958 B2 JP4645958 B2 JP 4645958B2 JP 2006309676 A JP2006309676 A JP 2006309676A JP 2006309676 A JP2006309676 A JP 2006309676A JP 4645958 B2 JP4645958 B2 JP 4645958B2
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vibration
mold
liquid
metal bellows
bellows
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JP2008100489A (en
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哲也 狩野
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Showa Rasenkan Seisakusho Co Ltd
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Description

この発明は、特にベローズの山部側にラテックス（ゴム乳液）などを加硫したフレキシブルな防振継手を得るに際し、ベローズの山部側に積層される被覆層の荷重によってベローズが変形され潰されたりせず、歩留まりのよい成形を行うことが可能なフレキシブルな防振継手の製造方法に関するものである。  In particular, when obtaining a flexible anti-vibration joint in which latex (rubber emulsion) or the like is vulcanized on the bellows peak side, the bellows is deformed and crushed by the load of the coating layer laminated on the bellows peak side. The present invention relates to a method for manufacturing a flexible vibration-proof joint that can be molded with a good yield.

従来、ベローズ管として成形された管継手部材は、その設置箇所により様々な振動や伸縮を受けており、振動や伸縮が複合的に繰り返し加わるために、また、長年にわたり繰り返し加わることにより、様々な箇所に破損が生じている。さらに、管継手部材が受ける消音の被害も大きくその静粛性も課題となっている。  Conventionally, pipe joint members molded as bellows pipes have undergone various vibrations and expansions depending on their installation locations, and since vibrations and expansions are repeatedly applied in a complex manner, and by repeated application over many years, The part is damaged. Furthermore, the noise-damping damage received by the pipe joint member is significant, and its silence is also an issue.

比較的に短い長さのベローズ管として、すなわち山数の比較的に少ないベローズ管として、従来より防振性の向上を目指したフレキシブルな管継手部材が提案されている。例えば、特許文献１のように、可撓伸縮継手１は、ベローズ状金属管２の外周を一定厚で被覆するゴム層３からなり、そのベローズ状金属管２の両端側をフランジ部材４，４により挟持した構成よりなるものがある。  As a bellows pipe having a relatively short length, that is, a bellows pipe having a relatively small number of peaks, a flexible pipe joint member aiming at improving vibration isolation has been proposed. For example, as in Patent Document 1, the flexible expansion joint 1 is composed of a rubber layer 3 that covers the outer periphery of the bellows-shaped metal tube 2 with a constant thickness, and both ends of the bellows-shaped metal tube 2 are connected to the flange members 4, 4. There are some which consist of the structure clamped by.

また、特許文献２のように、耐熱ゴムなど弾性材７からなる所定長さの中空筒状継手本体５と、この継手本体５の両側に取り付けられた環状フランジ８を備え、継手本体５の内周側にベローズ金属管６が継手本体５と密着して配設され、継手本体５の肉厚が少なくともベローズ金属管６のベローズの山又は谷の寸法より大となっている構成よりなるものがある。
特開２００６−１５３２３９号公報 特開２００５−３０４１６号公報 Further, as in Patent Document 2, a hollow cylindrical joint body 5 having a predetermined length made of an elastic material 7 such as heat-resistant rubber and annular flanges 8 attached to both sides of the joint body 5 are provided. The bellows metal pipe 6 is disposed in close contact with the joint body 5 on the peripheral side, and the thickness of the joint body 5 is at least larger than the size of the peak or valley of the bellows metal pipe 6. is there.
JP 2006-153239 A JP 2005-30416 A

ところで、このように比較的短い長さの山数の少ないベローズ管として、耐久性や防振性の向上を図る場合には、ベローズ金属管の外周（ベローズの山部）にゴム層を被覆することでその目的を達成しようとする場合が多い。  By the way, as a bellows pipe having a relatively short length and a small number of peaks, in order to improve durability and vibration isolation, a rubber layer is coated on the outer periphery (bellows peak portion) of the bellows metal pipe. In many cases, this goal is achieved.

しかしながら、ベローズ金属管の外周（ベローズの山部）をゴム層で被覆した場合は、成形時に加硫されるゴムの圧力によってベローズの山部が変形したり潰れたりするため、ベローズの破損の少ない歩留まりのよい成形を行うことができなかった。  However, when the outer periphery of the bellows metal tube (bellows crest) is covered with a rubber layer, the bellows crest is deformed or crushed by the pressure of rubber vulcanized during molding, so the bellows is less damaged. Molding with good yield could not be performed.

この発明は、上記のような目的を達成するために、特にベローズの山部側にラテックスなどの防振部材で被覆したフレキシブルな防振継手を得るに際し、ベローズの山部を変形したり潰したりせず歩留まりのよい成形を行うことができるフレキシブルな防振継手の製造方法を提供するものである。  In order to achieve the above-described object, the present invention, in particular, when obtaining a flexible vibration-proof joint coated with a vibration-proof member such as latex on the peak portion side of the bellows, deforms or crushes the peak portion of the bellows. The present invention provides a method for manufacturing a flexible anti-vibration joint that can be molded with good yield.

この発明は、そのような課題を解決するために、請求項１記載のように、金属ベローズ管の外周に防振部材を積層してなるフレキシブルな防振継手の製造方法において、
上記金属ベローズ管を囲撓して規制する金型は、その径方向の外周側から外嵌される外金型と、その軸方向の両端部側から外嵌されると共に、その内周部側にはめ込まれる内金型とよりなり、
上記外金型は、ラテックスである防振部材が注入される防振部材注入部を有すると共に、上記防振部材の注入を制御する防振部材注入制御部が設けられ、且つ、その内部には上記防振部材の導入空間部が形成され、
上記内金型は、水などの液体の注入を図る液体注入部を有すると共に、上記液体の注入を制御する液体注入制御部が設けられ、且つ、その内部には上記液体の導入空間部が形成され、
上記外金型と上記内金型とに挟まれて成形される上記金属ベローズ管は、上記外金型の導入空間部内に充填されると共に、上記金属ベローズ管の山部外周側に加わる上記防振部材の圧力と、上記内金型の導入空間部内に充填されると共に、上記金属ベローズ管の谷部 内周部側に加わる上記液体の圧力とが互いに均等圧となるように制御されることを特徴とする。In order to solve such a problem, the present invention provides a flexible vibration-proof joint manufacturing method in which a vibration-proof member is laminated on the outer periphery of a metal bellows pipe as described in claim 1.
The mold that surrounds and regulates the metal bellows tube includes an outer mold that is fitted from the outer peripheral side in the radial direction, and an outer mold that is fitted from both ends in the axial direction, and the inner peripheral side thereof. It consists of an inner mold that fits in,
The outer mold has a vibration isolating member injecting portion into which a vibration isolating member made of latex is injected, and a vibration isolating member injection control unit for controlling the injection of the anti vibration isolating member is provided, and the inside thereof has an inside thereof. An introduction space for the vibration isolating member is formed,
The inner mold has a liquid injection part for injecting a liquid such as water , a liquid injection control part for controlling the injection of the liquid, and a liquid introduction space part formed therein. And
The metal bellows pipe formed by being sandwiched between the outer mold and the inner mold is filled in the introduction space portion of the outer mold and is applied to the outer peripheral side of the mountain portion of the metal bellows pipe. Control is performed so that the pressure of the vibration member and the pressure of the liquid applied to the inner peripheral portion of the valley portion of the metal bellows tube are equal to each other while being filled in the introduction space portion of the inner mold. It is characterized by.

請求項１記載の発明によれば、金属ベローズ管の径方向の外周側から外嵌される外金型と、金属ベローズ管の軸方向の両端部側から外嵌されると共に、その内周部側にはめ込まれる内金型とにおいて、上記外金型と上記内金型とに挟まれて成形される上記金属ベローズ管は、上記外金型の導入空間部内に充填されると共に、上記金属ベローズ管の山部外周側に加わる上記防振部材の圧力と、上記内金型の導入空間部内に充填されると共に、上記金属ベローズ管の谷部内周部側に加わる上記液体の圧力とが互いに均等圧となるように制御されるので、その山部側に積層される被覆層の荷重によってベローズが変形したり潰されたりせず、歩留まりのよい成形を行うことが可能となる。According to the first aspect of the present invention, the outer mold is fitted from the outer peripheral side in the radial direction of the metal bellows tube, and the outer peripheral portion is fitted from both ends in the axial direction of the metal bellows tube. The metal bellows tube formed by being sandwiched between the outer mold and the inner mold in the inner mold fitted into the side is filled in the introduction space of the outer mold, and the metal bellows The pressure of the anti-vibration member applied to the outer peripheral side of the crest of the tube and the pressure of the liquid applied to the inner peripheral side of the trough of the metal bellows tube are equal to each other while being filled in the introduction space of the inner mold. Since the pressure is controlled so as to be a pressure, the bellows is not deformed or crushed by the load of the coating layer laminated on the peak side, and it is possible to perform molding with a high yield.

以下、この発明の実施例を図面に基づき詳細に説明する。図１は、この発明に係る金属ベローズの成形装置の一部を破砕した断面図、図２は、この発明に係る金属ベローズの成形装置の他例を示す一部を破砕した断面図である。  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a part of a metal bellows forming apparatus according to the present invention, and FIG. 2 is a cross-sectional view of a part of another example of a metal bellows forming apparatus according to the present invention.

図１において、この防振継手１０は、比較的に短い長さの金属ベローズ管１１よりなるもので、その軸方向に山部１２と谷部１３が形成され、両端部に一対のフランジ部１４，１４を有した構成とされており、一対のフランジ部１４，１４に挟まれた金属ベローズ管１１の外周側は防振部材１５によって被覆されている。  In FIG. 1, the vibration-proof joint 10 is composed of a metal bellows tube 11 having a relatively short length. A peak portion 12 and a valley portion 13 are formed in the axial direction, and a pair of flange portions 14 are formed at both ends. , 14, and the outer peripheral side of the metal bellows tube 11 sandwiched between the pair of flange portions 14, 14 is covered with a vibration isolating member 15.

金属ベローズ管１１の外周側を被覆する防振部材１５は、耐久性や振動防止性や消音性などの向上するなどのために被覆されるのであるが、この防振部材１５はゴム部材や樹脂部材などの部材よりなる。この部材は、種々の被覆目的に応じて適宜選択され、例えばラテックスのように加硫されたゴム部材により形成されるものが好適である。  The anti-vibration member 15 covering the outer peripheral side of the metal bellows tube 11 is covered for the purpose of improving durability, anti-vibration properties, silencing, etc. The anti-vibration member 15 is made of rubber or resin. It consists of members, such as a member. This member is appropriately selected according to various coating purposes, and is preferably formed of a rubber member vulcanized like, for example, latex.

また、この防振部材１５は、図１のように、金属ベローズ管１１の外周側に一定肉厚で形成されるものの他、一定肉厚に限定されず、金属ベローズ管１１の山部１２又は谷部１３の寸法より大とされるなど、種々の肉厚として形成されるものでもよい。  Further, as shown in FIG. 1, the vibration isolation member 15 is not limited to a constant thickness other than that formed on the outer peripheral side of the metal bellows tube 11, and is not limited to a constant thickness. It may be formed as various thicknesses such as being larger than the dimension of the valley portion 13.

次に、フレキシブルな防振継手１０の成形について説明する。図３は、クレーム対応図であり、外金型１６のセットを行う（１００）と共に、内金型１７のセットを行い（１０１）、外金型１６に防振部材を充填し（１０２）、内金型１７に液体を充填し（１０３）し、その後に外内・金型の充填部材の制御を行って（１０４）、外内・金型の充填部材を均等圧に制御するものである。  Next, molding of the flexible vibration-proof joint 10 will be described. FIG. 3 is a diagram corresponding to the claims, in which the outer mold 16 is set (100), the inner mold 17 is set (101), and the outer mold 16 is filled with a vibration isolating member (102). The inner mold 17 is filled with a liquid (103), and then the inner and mold filling members are controlled (104) to control the outer and inner filling members to a uniform pressure. .

一対のフランジ部１４，１４の間に挟まれた金属ベローズ管１１の外周には、外金型１６が外嵌される。この外金型１６は、ラテックスなどの防振部材１５の注入を図る防振部材注入部１６ａを有しており、また、防振部材１６の注入を制御する防振部材注入制御部１６ｂが設けられ、且つ、外金型１６の内部には防振部材１５の導入空間部１６ｃが形成されている。  An outer mold 16 is fitted on the outer periphery of the metal bellows tube 11 sandwiched between the pair of flange portions 14 and 14. The outer mold 16 has a vibration isolating member injection portion 16a for injecting a vibration isolating member 15 such as latex, and a vibration isolating member injection control portion 16b for controlling the injection of the vibration isolating member 16 is provided. In addition, an introduction space portion 16 c of the vibration isolation member 15 is formed inside the outer mold 16.

フランジ部１４，１４の外側と金属ベローズ管１１との内側には、内金型１７が装着される。この内金型１７は、水などの液体の注入を図る液体注入部１７ａを有しており、また、その液体の注入を制御する液体注入制御部１７ｂが設けられ、且つ、内金型１７の内部には液体の導入空間部１７ｃが形成されている。  An inner mold 17 is attached to the outside of the flange portions 14 and 14 and the inside of the metal bellows tube 11. The inner mold 17 has a liquid injection part 17 a for injecting a liquid such as water, a liquid injection control part 17 b for controlling the injection of the liquid, and the inner mold 17. A liquid introduction space 17c is formed inside.

そして、一対のフランジ部１４，１４の外側と金属ベローズ管１１との内側に内金型１７がはめ込まれ、金属ベローズ管１１の外周に外金型１６が配置されると、内金型１７の液体注入制御部１７ｂと外金型１６の防振部材注入制御部１６ｂとがそれぞれ動作され、液体注入部１７ａから内金型１７の導入空間部１７ｃに液体が注入され、また、防振部材注入部１６ａから外金型１６の導入空間部１６ｃに防振部材１５が注入される。  When the inner mold 17 is fitted inside the pair of flange portions 14, 14 and the metal bellows pipe 11, and the outer mold 16 is disposed on the outer periphery of the metal bellows pipe 11, The liquid injection control unit 17b and the vibration isolation member injection control unit 16b of the outer mold 16 are operated to inject liquid from the liquid injection unit 17a into the introduction space 17c of the inner mold 17, and also to inject the vibration isolation member. The vibration isolating member 15 is injected from the portion 16a into the introduction space portion 16c of the outer mold 16.

このとき、外金型１６と内金型１７とに挟まれて成形されるフレキシブルな防振継手１０は、外金型１６の導入空間部１６ｃに充填された防振部材１５と、内金型１７の導入空間部１７ｃに充填された液体Ｘ１７ｃとの圧力とが互いに均等圧（１５＝Ｘ）となるように制御される。  At this time, the flexible vibration-proof joint 10 formed by being sandwiched between the outer mold 16 and the inner mold 17 includes the vibration-proof member 15 filled in the introduction space 16c of the outer mold 16 and the inner mold. The pressure with the liquid X17c filled in the 17 introduction spaces 17c is controlled to be equal to each other (15 = X).

このように、外金型１６と内金型１７とに加わる圧力、すなわち外金型１６の導入空間部１６ｃに充填される防振部材１５と内金型１７の導入空間部１７ｃに充填される液体Ｘとの圧力が、互いに均等圧（１５＝Ｘ）となるように制御され、ベローズの山部１２と谷部１３とが同じ加圧で維持されるので、ベローズの山部１２側に積層される被覆層の荷重によってベローズが変形されたり潰されたりせず、歩留まりのよい成形を行うことが可能となる。  In this way, the pressure applied to the outer mold 16 and the inner mold 17, that is, the vibration isolating member 15 filled in the introduction space 16 c of the outer mold 16 and the introduction space 17 c of the inner mold 17 are filled. The pressure with the liquid X is controlled to be equal to each other (15 = X), and the peak 12 and the valley 13 of the bellows are maintained at the same pressure, so that they are stacked on the bellows peak 12 side. The bellows is not deformed or crushed by the applied load of the coating layer, and it is possible to perform molding with a high yield.

なお、ベローズの山部１２側に積層される被覆層は、一定肉厚のものでなく種々の肉厚に変化するものでもよく、この場合には、外金型１６の防振部材１５の導入空間部１６ｃの形状を変えればよい。  In addition, the coating layer laminated | stacked on the mountain part 12 side of a bellows may change into various thickness instead of a constant thickness, and in this case, introduction of the vibration isolator 15 of the outer die 16 What is necessary is just to change the shape of the space part 16c.

図２に示すものは、フランジ部を有しない場合の防振継手１０の成形装置を示すもので、金属ベローズ管１１の外周を外金型１６が囲繞すると共に、その外側に内金型１７が囲繞する構成とされるものであり、外金型１６と内金型１７との構成は図１と同様である。  2 shows a molding apparatus for the vibration-proof joint 10 when no flange portion is provided. An outer mold 16 surrounds the outer periphery of the metal bellows tube 11, and an inner mold 17 is disposed outside the outer mold 16. As shown in FIG. It is set as the structure which surrounds, and the structure of the outer metal mold | die 16 and the inner metal mold | die 17 is the same as that of FIG.

以上のように、このフレキシブルな防振継手は防振部材の成形に際し、外金型と内金型とに加わる圧力、すなわち外金型の導入空間部ｃに充填される防振部材と内金型の導入空間部に充填される液体との圧力が互いに均等圧となるように制御され、ベローズの山部と谷部とが見かけ上同じ加圧で維持されるので、ベローズの山部側に積層される被覆層はベローズが変形されたり潰されたりせず、歩留まりのよい成形を行うことが可能となった。  As described above, this flexible vibration-proof joint is used in the formation of the vibration-proof member, the pressure applied to the outer mold and the inner mold, that is, the vibration-proof member and the inner mold filled in the introduction space c of the outer mold. The pressure with the liquid filled in the introduction space of the mold is controlled so as to be equal to each other, and the peak and valley of the bellows are maintained at the same pressure as it appears. The covering layer to be laminated can be molded with a high yield without the bellows being deformed or crushed.

このフレキシブルな防振継手の製造方法は、フレキシブルな防振継手についてのみならずあらゆる分野に応用が可能であり、防振部材の成形は外金型と内金型と逆に設定することも可能である。  This flexible anti-vibration joint manufacturing method can be applied not only to flexible anti-vibration joints but also to all fields, and the formation of anti-vibration members can be reversed between the outer mold and the inner mold. It is.

この発明に係る金属ベローズの成形装置の一部を破砕した断面図である。  It is sectional drawing which fractured | ruptured a part of shaping | molding apparatus of the metal bellows which concerns on this invention. この発明に係る金属ベローズの成形装置の他例を示す一部を破砕した断面図である。  It is sectional drawing which fractured | ruptured a part which shows the other example of the shaping | molding apparatus of the metal bellows concerning this invention. この発明に係る金属ベローズの成形を示すクレーム対応図である。  It is a claim corresponding | compatible figure which shows shaping | molding of the metal bellows which concerns on this invention. 従来のフレキシブルな管継手部材を示す断面図である。  It is sectional drawing which shows the conventional flexible pipe joint member. 従来のフレキシブルな管継手部材の第２の実施例を示す断面図である。  It is sectional drawing which shows the 2nd Example of the conventional flexible pipe joint member.

符号の説明Explanation of symbols

１０ フレキシブルな防振継手
１１ 金属ベローズ管
１２ 山部
１３ 谷部
１４ フランジ部
１５ 防振部材
１６ 外金型
１６ａ 防振部材注入部
１６ｂ 防振部材注入制御部
１６ｃ 防振部材の導入空間部
１７ 内金型
１７ａ 液体注入部
１７ｂ 液体注入制御部
１７ｃ 液体の導入空間部DESCRIPTION OF SYMBOLS 10 Flexible anti-vibration joint 11 Metal bellows pipe 12 Peak part 13 Valley part 14 Flange part 15 Anti-vibration member 16 Outer metal mold 16a Anti-vibration member injection | pouring part 16b Anti-vibration member injection | pouring control part 16c Introducing space part 17 of anti-vibration member Mold 17a Liquid injection part 17b Liquid injection control part 17c Liquid introduction space part

Claims (1)

金属ベローズ管の外周に防振部材を積層してなるフレキシブルな防振継手の製造方法において、
上記金属ベローズ管を囲撓して規制する金型は、その径方向の外周側から外嵌される外金型と、その軸方向の両端部側から外嵌されると共に、その内周部側にはめ込まれる内金型とよりなり、
上記外金型は、ラテックスである防振部材が注入される防振部材注入部を有すると共に、上記防振部材の注入を制御する防振部材注入制御部が設けられ、且つ、その内部には上記防振部材の導入空間部が形成され、
上記内金型は、水などの液体の注入を図る液体注入部を有すると共に、上記液体の注入を制御する液体注入制御部が設けられ、且つ、その内部には上記液体の導入空間部が形成され、
上記外金型と上記内金型とに挟まれて成形される上記金属ベローズ管は、上記外金型の導入空間部内に充填されると共に、上記金属ベローズ管の山部外周側に加わる上記防振部材の圧力と、上記内金型の導入空間部内に充填されると共に、上記金属ベローズ管の谷部内周部側に加わる上記液体の圧力とが互いに均等圧となるように制御されることを特徴とするフレキシブルな防振継手の製造方法。In the manufacturing method of the flexible vibration-proof joint formed by laminating the vibration-proof member on the outer periphery of the metal bellows pipe,
The mold that surrounds and regulates the metal bellows tube includes an outer mold that is fitted from the outer peripheral side in the radial direction, and an outer mold that is fitted from both ends in the axial direction, and the inner peripheral side thereof. It consists of an inner mold that fits in,
The outer mold has a vibration isolating member injecting portion into which a vibration isolating member made of latex is injected, and a vibration isolating member injection control unit for controlling the injection of the anti vibration isolating member is provided, and the inside thereof has an inside thereof. An introduction space for the vibration isolating member is formed,
The inner mold has a liquid injection portion for injecting a liquid such as water , a liquid injection control portion for controlling the injection of the liquid, and an introduction space portion for the liquid formed therein. And
The metal bellows pipe formed by being sandwiched between the outer mold and the inner mold is filled in the introduction space portion of the outer mold and is applied to the outer peripheral side of the mountain portion of the metal bellows pipe. The pressure of the vibration member and the pressure of the liquid applied to the inner peripheral side of the valley portion of the metal bellows tube are controlled to be equal to each other while being filled in the introduction space portion of the inner mold. A method for manufacturing a flexible vibration-proof joint.
JP2006309676A 2006-10-18 2006-10-18 Manufacturing method of flexible vibration-proof joint Expired - Fee Related JP4645958B2 (en)

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JPS62264932A (en) * 1986-05-13 1987-11-17 Hayakawa Rubber Co Ltd Manufacture of binding type vibration damping tubular material
JPH07148860A (en) * 1993-11-30 1995-06-13 Pacific Ind Co Ltd Manufacture of vibration absorbing pipe
JP2001159478A (en) * 1999-12-03 2001-06-12 Toyo Tire & Rubber Co Ltd Flexible expansion pipe and flexible expansion joint
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JP2002126827A (en) * 2000-10-24 2002-05-08 Kawasaki Heavy Ind Ltd High-temperature bulge forming method and high- temperature bulge forming apparatus
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JP2002323187A (en) * 2001-04-23 2002-11-08 Kurashiki Kako Co Ltd Flexible joint and method of manufacturing the flexible joint
JP2004251291A (en) * 2003-02-17 2004-09-09 Sankei Giken:Kk Vibration damping joint

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5888265A (en) * 1981-11-17 1983-05-26 Sumitomo Electric Ind Ltd Method of manufacturing bellows made of fiber reinforcing composite material
JPS62264932A (en) * 1986-05-13 1987-11-17 Hayakawa Rubber Co Ltd Manufacture of binding type vibration damping tubular material
JPH07148860A (en) * 1993-11-30 1995-06-13 Pacific Ind Co Ltd Manufacture of vibration absorbing pipe
JP2001159478A (en) * 1999-12-03 2001-06-12 Toyo Tire & Rubber Co Ltd Flexible expansion pipe and flexible expansion joint
JP2001295963A (en) * 2000-04-13 2001-10-26 Toyoda Gosei Co Ltd Flexible hose
JP2002126827A (en) * 2000-10-24 2002-05-08 Kawasaki Heavy Ind Ltd High-temperature bulge forming method and high- temperature bulge forming apparatus
JP2002295676A (en) * 2001-04-04 2002-10-09 Isuzu Motors Ltd Bellows pipe and manufacturing method therefor
JP2002323187A (en) * 2001-04-23 2002-11-08 Kurashiki Kako Co Ltd Flexible joint and method of manufacturing the flexible joint
JP2004251291A (en) * 2003-02-17 2004-09-09 Sankei Giken:Kk Vibration damping joint

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