JP2021071119A

JP2021071119A - Joint structure and assembly method of the same

Info

Publication number: JP2021071119A
Application number: JP2019195857A
Authority: JP
Inventors: 雄太茂木; Yuta Mogi; 謙士大島; Kenji Oshima; 隆博松田; Takahiro Matsuda; 章弘原田; Akihiro Harada
Original assignee: Fujikin Inc
Current assignee: Fujikin Inc
Priority date: 2019-10-29
Filing date: 2019-10-29
Publication date: 2021-05-06
Anticipated expiration: 2039-10-29
Also published as: JP7341469B2

Abstract

To provide a joint structure which can prevent a gasket from being excessively fastened while achieving simplification of a joint member, and to provide an assembly method of the joint structure.SOLUTION: A joint structure 1 includes: a first joint member 2; a second joint member 4; a gasket 6 disposed between the first joint member 2 and the second joint member 4; and a retainer 7 including a first retainer 71 attached to an outer peripheral surface of the first joint member 2 and a second retainer 72 detachably attached to the first retainer 71. A butted end surface 24 of the first joint member 2 is provided with: a first contact area 25 with which the first retainer 71 contacts; and a first projection 26 pressed to one end surface of the gasket 6. A butted end surface 43 of the second joint member 4 is provided with: a second contact area 44 with which the second retainer contacts; and a second projection 45 pressed to the other end surface of the gasket.SELECTED DRAWING: Figure 1

Description

本発明は、継手構造及び継手構造の組み付け方法に関する。 The present invention relates to a joint structure and a method of assembling the joint structure.

特許文献１には、外周に雄ねじが形成される第１継手部材と、雄ねじに螺合するナット部材と、ナット部材に挿入される第２継手部材と、第１継手部材と第２継手部材との間に設けられるガスケットと、ガスケットを保持するリテーナと、を備える継手構造が開示されている。 Patent Document 1 describes a first joint member in which a male screw is formed on the outer periphery, a nut member screwed into the male screw, a second joint member inserted into the nut member, and a first joint member and a second joint member. A joint structure comprising a gasket provided between the two and a retainer for holding the gasket is disclosed.

特開２０１８−１７３８１号公報Japanese Unexamined Patent Publication No. 2018-17381

しかしながら、特許文献１に記載の継手構造では、第１継手部材の突き合わせ端面及び第２継手部材の突き合わせ端面に過剰締め付け防止用環状突起が設けられるため、第１継手部材及び第２継手部材の構造が複雑になってしまう。 However, in the joint structure described in Patent Document 1, since the butt end face of the first joint member and the butt end face of the second joint member are provided with annular protrusions for preventing overtightening, the structures of the first joint member and the second joint member are provided. Becomes complicated.

本発明は、上記のような事情に鑑みてなされたものであり、継手部材の簡素化を図りながらガスケットへの過剰締め付けを防止することができる継手構造及び継手構造の組み付け方法を提供することを目的とする。 The present invention has been made in view of the above circumstances, and provides a joint structure and a method for assembling the joint structure that can prevent overtightening of the gasket while simplifying the joint member. The purpose.

本発明のある態様によれば、内周に第１流体流路が形成されるとともに外周に雄ねじが形成される第１継手部材と、前記雄ねじに螺合する雌ねじを有するナット部材と、内周に第２流体流路が形成され、端部が前記ナット部材内に係止される第２継手部材と、前記第１継手部材の突き合わせ端面と前記第２継手部材の突き合わせ端面との間に介装されるガスケットと、前記第１継手部材又は前記第２継手部材の外周面に取り付けられる第１リテーナと、着脱可能に前記第１リテーナに取り付けられる第２リテーナと、を有し、前記ガスケットを前記第１リテーナ及び前記第２リテーナにより保持する保持手段と、を備え、前記第１継手部材の突き合わせ端面には、前記第１リテーナ及び前記第２リテーナのうちのいずれか一方が当接する第１当接領域と、前記第１当接領域よりも内側に位置するとともに前記ガスケットの一方の端面に押し付けられる第１突起と、が設けられ、前記第２継手部材の突き合わせ端面には、前記第１リテーナ及び前記第２リテーナのうちのいずれか他方が当接する第２当接領域と、前記第２当接領域よりも内側に位置するとともに前記ガスケットの他方の端面に押し付けられる第２突起と、が設けられ、前記保持手段は、前記第１当接領域と前記第２当接領域との間に挟持される継手構造が提供される。 According to an aspect of the present invention, a first joint member in which a first fluid flow path is formed on the inner circumference and a male screw is formed on the outer circumference, a nut member having a female screw screwed into the male screw, and an inner circumference. A second fluid flow path is formed in the second joint member, and an end portion is locked in the nut member, and an interposition between the butt end surface of the first joint member and the butt end surface of the second joint member. The gasket is provided with a gasket to be mounted, a first retainer attached to the outer peripheral surface of the first joint member or the second joint member, and a second retainer detachably attached to the first retainer. A first retainer comprising the first retainer and a holding means held by the second retainer, and one of the first retainer and the second retainer abuts on the abutting end surface of the first joint member. A contact region and a first protrusion located inside the first contact region and pressed against one end face of the gasket are provided, and the first protrusion is provided on the butt end face of the second joint member. A second contact area with which the retainer and any one of the second retainers abuts, and a second protrusion located inside the second contact area and pressed against the other end face of the gasket. The holding means is provided with a joint structure sandwiched between the first contact region and the second contact region.

本発明の態様によれば、継手部材の簡素化を図りながらガスケットへの過剰締め付けを防止することができる。 According to the aspect of the present invention, it is possible to prevent overtightening of the gasket while simplifying the joint member.

本発明の実施形態に係る継手構造を示す断面図である。It is sectional drawing which shows the joint structure which concerns on embodiment of this invention. リテーナを示す正面斜視図である。It is a front perspective view which shows the retainer. リテーナを示す背面斜視図である。It is a rear perspective view which shows the retainer. リテーナを示す正面図である。It is a front view which shows the retainer. リテーナを示す背面図である。It is a rear view which shows the retainer. 継手構造を組み付ける継手構造の組み付け方法を示すフローチャートである。It is a flowchart which shows the assembly method of the joint structure which assembles the joint structure.

以下、添付図面を参照しながら本発明の実施形態（以下、本実施形態と称する。）について説明する。本明細書においては、全体を通じて、同一の要素には同一の符号を付する。 Hereinafter, embodiments of the present invention (hereinafter, referred to as the present embodiment) will be described with reference to the accompanying drawings. Throughout the specification, the same elements are designated by the same reference numerals.

まず、図１から図２Ｄを参照しながら本実施形態に係る継手構造１について説明する。 First, the joint structure 1 according to the present embodiment will be described with reference to FIGS. 1 to 2D.

図１は、本実施形態に係る継手構造１を示す断面図である。なお、図１では、第１継手部材２及び第２継手部材４の一部を省略している。図２Ａは、リテーナ７を示す正面斜視図である。図２Ｂは、リテーナ７を示す背面斜視図である。図２Ｃは、リテーナ７を示す正面図である。図２Ｄは、リテーナ７を示す背面図である。また、図中において、継手構造１の軸方向を単に軸方向、継手構造１の径方向を単に径方向と称する。 FIG. 1 is a cross-sectional view showing a joint structure 1 according to the present embodiment. In FIG. 1, a part of the first joint member 2 and the second joint member 4 is omitted. FIG. 2A is a front perspective view showing the retainer 7. FIG. 2B is a rear perspective view showing the retainer 7. FIG. 2C is a front view showing the retainer 7. FIG. 2D is a rear view showing the retainer 7. Further, in the drawing, the axial direction of the joint structure 1 is simply referred to as an axial direction, and the radial direction of the joint structure 1 is simply referred to as a radial direction.

本実施形態に係る継手構造１は、例えば、流体としてのプロセスガス又はパージガスを供給するために流体供給ユニットに用いられる。流体供給ユニット（図示しない）は、半導体製造装置（ＣＶＤ装置、スパッタリング装置、エッチング装置等）におけるプロセスガス及びパージガスの供給手段に用いられる。 The joint structure 1 according to the present embodiment is used, for example, in a fluid supply unit to supply a process gas or a purge gas as a fluid. The fluid supply unit (not shown) is used as a means for supplying process gas and purge gas in a semiconductor manufacturing apparatus (CVD apparatus, sputtering apparatus, etching apparatus, etc.).

図１に示すように、継手構造１は、第１継手部材２、ナット部材３、第２継手部材４、ベアリング５、ガスケット６及び保持手段としてのリテーナ７を備える。 As shown in FIG. 1, the joint structure 1 includes a first joint member 2, a nut member 3, a second joint member 4, a bearing 5, a gasket 6, and a retainer 7 as a holding means.

第１継手部材２は、プロセスガス又はパージガスを半導体製造装置へ供給するための金属製の管部材であり、略筒状（具体的には、略円筒状）に形成される。第１継手部材２は、内周に形成される第１流体流路２１と、外周の一部に形成される保持部としての段差部２２と、外周の他の一部に形成される雄ねじ２３と、を有する。 The first joint member 2 is a metal pipe member for supplying a process gas or a purge gas to a semiconductor manufacturing apparatus, and is formed in a substantially cylindrical shape (specifically, a substantially cylindrical shape). The first joint member 2 includes a first fluid flow path 21 formed on the inner circumference, a stepped portion 22 as a holding portion formed on a part of the outer circumference, and a male screw 23 formed on the other part of the outer circumference. And have.

第１流体流路２１は、その一端が第１継手部材２の突き合わせ端面２４で開口する。第１流体流路２１を通じてプロセスガス又はパージガスが半導体製造装置へ供給される。 One end of the first fluid flow path 21 opens at the butt end surface 24 of the first joint member 2. Process gas or purge gas is supplied to the semiconductor manufacturing apparatus through the first fluid flow path 21.

段差部２２は、筒状（具体的には、円筒状）に形成され、リテーナ７の後述する第１リテーナ７１における第１被保持部７１１を保持するための保持部である。段差部２２は、第１継手部材２の外周において突き合わせ端面２４から軸方向に延在する。雄ねじ２３は、ナット部材３の後述する雌ねじ３３に螺合するための雄ねじである。雄ねじ２３は、段差部２２と干渉しないように形成される。 The step portion 22 is formed in a tubular shape (specifically, a cylindrical shape), and is a holding portion for holding the first held portion 711 in the first retainer 71 described later of the retainer 7. The step portion 22 extends axially from the butt end surface 24 on the outer periphery of the first joint member 2. The male screw 23 is a male screw for screwing into the female screw 33 described later of the nut member 3. The male screw 23 is formed so as not to interfere with the step portion 22.

ガスケット６の一方の端面に対向する第１継手部材２の環状（具体的には円環状）の突き合わせ端面２４には、第１当接領域２５及び第１突起２６が設けられる。第１突起２６は、第１当接領域２５よりも径方向の内側に位置する。 A first contact region 25 and a first protrusion 26 are provided on an annular (specifically, annular) butt end surface 24 of the first joint member 2 facing one end surface of the gasket 6. The first protrusion 26 is located inside the first contact region 25 in the radial direction.

第１当接領域２５は、リテーナ７の後述する第１リテーナ７１における第１挟持部７１２に当接するための平坦面である。第１当接領域２５は、突き合わせ端面２４の外周縁に環状（具体的には、円環状）に形成される。 The first contact region 25 is a flat surface for contacting the first sandwiching portion 712 of the first retainer 71, which will be described later, of the retainer 7. The first contact region 25 is formed in an annular shape (specifically, an annular shape) on the outer peripheral edge of the butt end face 24.

第１突起２６は、ガスケット６の一方の端面に押し付けられる。第１突起２６は、突き合わせ端面２４から突出するように環状（具体的には、円環状）に形成される。また、第１突起２６は、その先端に向かうに従って先細りに形成される。 The first protrusion 26 is pressed against one end face of the gasket 6. The first protrusion 26 is formed in an annular shape (specifically, an annular shape) so as to project from the butt end face 24. Further, the first protrusion 26 is formed so as to taper toward the tip thereof.

ナット部材３は、第１継手部材２の端部及び第２継手部材４の端部を収容するための金属製の袋ナットである。ナット部材３は、略有底筒状（具体的には、略有底円筒状）に形成される。ナット部材３の底面部３１には、底面部３１を貫通する貫通孔３２が形成される。貫通孔３２には第２継手部材４が挿通される。ナット部材３の先端側の内周には、第１継手部材２の雄ねじ２３に螺合する雌ねじ３３が形成される。 The nut member 3 is a metal bag nut for accommodating the end portion of the first joint member 2 and the end portion of the second joint member 4. The nut member 3 is formed in a substantially bottomed tubular shape (specifically, a substantially bottomed cylindrical shape). A through hole 32 penetrating the bottom surface portion 31 is formed in the bottom surface portion 31 of the nut member 3. The second joint member 4 is inserted through the through hole 32. A female screw 33 screwed into the male screw 23 of the first joint member 2 is formed on the inner circumference of the nut member 3 on the tip end side.

第２継手部材４は、第１継手部材２と同様に、プロセスガス又はパージガスを半導体製造装置へ供給するための金属製の管部材であり、略筒状（具体的には、略円筒状）に形成される。第２継手部材４は、その端部がナット部材３に係止される。なお、第１継手部材２と第２継手部材４とは、同軸に配置される。第２継手部材４は、内周に形成される第２流体流路４１と、端部の外周に設けられるフランジ４２と、を有する。 Like the first joint member 2, the second joint member 4 is a metal pipe member for supplying process gas or purge gas to the semiconductor manufacturing apparatus, and has a substantially cylindrical shape (specifically, a substantially cylindrical shape). Is formed in. The end of the second joint member 4 is locked to the nut member 3. The first joint member 2 and the second joint member 4 are arranged coaxially. The second joint member 4 has a second fluid flow path 41 formed on the inner circumference and a flange 42 provided on the outer periphery of the end portion.

第２流体流路４１は、その一端が第２継手部材４の突き合わせ端面４３で開口する。第２流体流路４１を通じてプロセスガス又はパージガスが半導体製造装置へ供給される。なお、第１流体流路２１と第２流体流路４１とを同径に形成することが好ましい。 One end of the second fluid flow path 41 opens at the abutting end surface 43 of the second joint member 4. Process gas or purge gas is supplied to the semiconductor manufacturing apparatus through the second fluid flow path 41. It is preferable that the first fluid flow path 21 and the second fluid flow path 41 are formed to have the same diameter.

本実施形態では、フランジ４２とナット部材３の底面部３１との間には、共回り防止用のベアリング５が設けられているが、これに限定されるものではなく、例えば、ベアリング５を設けなくてもよい。 In the present embodiment, a bearing 5 for preventing co-rotation is provided between the flange 42 and the bottom surface portion 31 of the nut member 3, but the present invention is not limited to this, and for example, the bearing 5 is provided. It does not have to be.

第１継手部材２と同様に、ガスケット６の他方の端面に対向する第２継手部材４の環状（具体的には円環状）の突き合わせ端面４３には、第２当接領域４４及び第２突起４５が設けられる。第２突起４５は、第２当接領域４４よりも径方向の内側に位置する。 Similar to the first joint member 2, the second contact region 44 and the second protrusion are formed on the annular (specifically, annular) butt end surface 43 of the second joint member 4 facing the other end surface of the gasket 6. 45 is provided. The second protrusion 45 is located inside the second contact region 44 in the radial direction.

第２当接領域４４は、リテーナ７の第２リテーナ７２における第２挟持部７２２に当接するための平坦面である。第２当接領域４４は、第１当接領域２５と同様に、突き合わせ端面４３の外周縁に環状（具体的には、円環状）に形成される。 The second contact region 44 is a flat surface for contacting the second holding portion 722 of the second retainer 72 of the retainer 7. The second contact region 44 is formed in an annular shape (specifically, an annular shape) on the outer peripheral edge of the butt end face 43, similarly to the first contact region 25.

第２突起４５は、ガスケット６の一方の端面に押し付けられる。第２突起４５は、第１突起２６と同様に、突き合わせ端面４３から突出するように環状（具体的には、円環状）に形成される。また、第２突起４５は、その先端に向かうに従って先細りに形成される。 The second protrusion 45 is pressed against one end face of the gasket 6. Like the first protrusion 26, the second protrusion 45 is formed in an annular shape (specifically, an annular shape) so as to project from the butt end face 43. Further, the second protrusion 45 is formed so as to taper toward the tip thereof.

第１突起２６は、その突出量（すなわち、第１当接領域２５から第１突起２６の先端までの距離）が第２突起４５の突出量（すなわち、第２当接領域４４から第２突起４５の先端までの距離）と一致する。また、第１突起２６の先端と第２突起４５の先端とは、同一円周上に形成される。 The protrusion amount of the first protrusion 26 (that is, the distance from the first contact region 25 to the tip of the first protrusion 26) is the protrusion amount of the second protrusion 45 (that is, the second protrusion from the second contact region 44). Distance to the tip of 45). Further, the tip of the first protrusion 26 and the tip of the second protrusion 45 are formed on the same circumference.

ガスケット６は、第１継手部材２の突き合わせ端面２４と第２継手部材４の突き合わせ端面４３との間に介装される環状（具体的には円環状）のシール材である。ガスケット６は、複数の外径を有することなく単一の外径を有する。これにより、ガスケット６の簡素化を図ることができる。 The gasket 6 is an annular (specifically, annular) sealing material interposed between the butt end surface 24 of the first joint member 2 and the butt end surface 43 of the second joint member 4. The gasket 6 has a single outer diameter without having a plurality of outer diameters. Thereby, the gasket 6 can be simplified.

また、ガスケット６は、形状記憶合金から構成される。これにより、継手構造１のガスケット６として使用されたガスケット６に対し加熱等の工程を行うことにより、このガスケット６の形状を元に戻すことができるので、ガスケット６を使い捨てることなく、繰り返して再利用することができる。このため、ガスケット６の再利用による継手構造１の低コスト化を図ることができる。 The gasket 6 is made of a shape memory alloy. As a result, the shape of the gasket 6 can be restored by performing a process such as heating on the gasket 6 used as the gasket 6 of the joint structure 1, so that the gasket 6 can be repeatedly used without being thrown away. Can be reused. Therefore, the cost of the joint structure 1 can be reduced by reusing the gasket 6.

リテーナ７は、ガスケット６を保持するための保持手段である。リテーナ７は、第１継手部材２の外周面（具体的には、段差部２２）に取り付けられる第１リテーナ７１と、着脱可能に第１リテーナ７１に取り付けられる第２リテーナ７２と、を有する。 The retainer 7 is a holding means for holding the gasket 6. The retainer 7 has a first retainer 71 attached to the outer peripheral surface (specifically, a step portion 22) of the first joint member 2, and a second retainer 72 detachably attached to the first retainer 71.

第１リテーナ７１及び第２リテーナ７２は、それぞれ第１継手部材２における第１当接領域２５及び第２継手部材４における第２当接領域４４に当接する。そして、ナット部材３が第１継手部材２に締め付けられた状態において、ガスケット６を保持した第１リテーナ７１及び第２リテーナ７２は、第１当接領域２５と第２当接領域４４との間に挟持される。これにより、ナット部材３が第１継手部材２に締め付けられた状態において、第１当接領域２５と第２当接領域４４との間のクリアランス（すなわち、第１継手部材２の突き合わせ端面２４と第２継手部材４の突き合わせ端面４３との間のクリアランス）は、ガスケット６、第１リテーナ７１及び第２リテーナ７２の存在により保たれるので、ガスケット６への過剰締め付けを防止することができる。 The first retainer 71 and the second retainer 72 abut on the first contact region 25 of the first joint member 2 and the second contact region 44 of the second joint member 4, respectively. Then, in a state where the nut member 3 is tightened to the first joint member 2, the first retainer 71 and the second retainer 72 holding the gasket 6 are between the first contact region 25 and the second contact region 44. It is sandwiched between. As a result, in a state where the nut member 3 is tightened to the first joint member 2, the clearance between the first contact region 25 and the second contact region 44 (that is, the butt end surface 24 of the first joint member 2). The clearance between the butt end face 43 of the second joint member 4) is maintained by the presence of the gasket 6, the first retainer 71, and the second retainer 72, so that overtightening of the gasket 6 can be prevented.

なお、第１リテーナ７１、第２リテーナ７２、第１継手部材２及び第２継手部材４は、同じ金属製の材質から構成される。さらに、第１リテーナ７１、第２リテーナ７２、第１継手部材２及び第２継手部材４の硬度は、ガスケット６の硬度よりも高い。 The first retainer 71, the second retainer 72, the first joint member 2, and the second joint member 4 are made of the same metal material. Further, the hardness of the first retainer 71, the second retainer 72, the first joint member 2 and the second joint member 4 is higher than the hardness of the gasket 6.

図１から図２Ｄに示すように、第１リテーナ７１は、第１継手部材２の外周面（具体的には、段差部２２）に保持される第１被保持部７１１と、第１当接領域２５とガスケット６の一方の端面における外縁とに当接するように第１被保持部７１１に接続される第１挟持部７１２と、を有する。 As shown in FIGS. 1 to 2D, the first retainer 71 comes into first contact with the first held portion 711 held on the outer peripheral surface (specifically, the step portion 22) of the first joint member 2. It has a first holding portion 712 connected to the first held portion 711 so as to abut the region 25 and the outer edge of one end surface of the gasket 6.

第１被保持部７１１は、同一円周上に所定の間隔を空けて形成される複数（ここでは、三つ）の第１被保持爪７１１ａから構成される。そして、第１被保持部７１１は、段差部２２を摺動することができる。複数の第１被保持爪７１１ａは、軸方向に延在して形成される。複数の第１被保持爪７１１ａの基端は、第１挟持部７１２に接続される。 The first held portion 711 is composed of a plurality of (here, three) first held claws 711a formed on the same circumference at predetermined intervals. Then, the first held portion 711 can slide the step portion 22. The plurality of first held claws 711a are formed so as to extend in the axial direction. The base ends of the plurality of first held claws 711a are connected to the first holding portion 712.

第１挟持部７１２は、第１被保持部７１１に接続される第１接続部７１３と、第１接続部７１３と径方向に重なるように第１接続部７１３に接続される第１増厚部７１４と、を有する。なお、第１挟持部７１２は、その厚み（すなわち、第１接続部７１３及び第１増厚部７１４の厚みの合計）が第１突起２６の突出量よりも僅かに小さい。 The first holding portion 712 is a first thickening portion connected to a first connecting portion 713 connected to the first held portion 711 and a first connecting portion 713 so as to radially overlap the first connecting portion 713. It has 714 and. The thickness of the first sandwiching portion 712 (that is, the total thickness of the first connecting portion 713 and the first thickening portion 714) is slightly smaller than the protrusion amount of the first protrusion 26.

第１接続部７１３は、環状（具体的には、円環状）板から構成され、第１継手部材２の第１当接領域２５に当接する。第１接続部７１３の一方の端面における外周縁には、複数の第１被保持爪７１１ａが接続される。一方、第１接続部７１３の他方の端面における内周縁には、複数の第１増厚片７１４ａが接続される。 The first connecting portion 713 is composed of an annular (specifically, annular) plate and abuts on the first contact region 25 of the first joint member 2. A plurality of first held claws 711a are connected to the outer peripheral edge of one end surface of the first connecting portion 713. On the other hand, a plurality of first thickening pieces 714a are connected to the inner peripheral edge of the other end surface of the first connecting portion 713.

第１増厚部７１４は、ガスケット６の一方の端面における外縁に当接する。また、第１増厚部７１４は、同一円周上に所定の間隔を空けて形成される複数（ここでは、三つ）の第１増厚片７１４ａをそれぞれ径方向に折り曲げて構成される。なお、複数の第１増厚片７１４ａは、それぞれ複数の第１被保持爪７１１ａの位置に対応して設けられる。 The first thickening portion 714 abuts on the outer edge of one end face of the gasket 6. Further, the first thickening portion 714 is formed by bending a plurality of (here, three) first thickening pieces 714a formed on the same circumference at predetermined intervals in the radial direction. The plurality of first thickening pieces 714a are provided corresponding to the positions of the plurality of first held claws 711a, respectively.

また、本実施形態では、第１挟持部７１２は、第１接続部７１３及び第１増厚部７１４の両方から構成されているが、これに限定されるものではなく、例えば、第１増厚部７１４を有することなく、第１接続部７１３のみから構成されてもよい。この場合、第１接続部７１３は、その厚みが本実施形態の第１接続部７１３及び第１増厚部７１４の厚みの合計となるように形成される。 Further, in the present embodiment, the first sandwiching portion 712 is composed of both the first connecting portion 713 and the first thickening portion 714, but is not limited thereto, and for example, the first thickening portion 712 is formed. It may be composed of only the first connection part 713 without having the part 714. In this case, the first connecting portion 713 is formed so that the thickness thereof is the total thickness of the first connecting portion 713 and the first thickening portion 714 of the present embodiment.

第２リテーナ７２は、第１リテーナ７１と別体に形成される。これにより、メンテナンス又は部品の交換時に第１リテーナ７１と第２リテーナ７２とを分離させることで、ガスケット６を容易に取り外すことができる。 The second retainer 72 is formed separately from the first retainer 71. As a result, the gasket 6 can be easily removed by separating the first retainer 71 and the second retainer 72 at the time of maintenance or replacement of parts.

図１から図２Ｄに示すように、第２リテーナ７２は、第１被保持部７１１に保持されガスケット６を収容する第２被保持部７２１と、第２当接領域４４とガスケット６の他方の端面における外縁とに当接するように第２被保持部７２１に接続される第２挟持部７２２と、を有する。 As shown in FIGS. 1 to 2D, the second retainer 72 is a second retainer 721 held by the first held portion 711 and accommodating the gasket 6, and the other of the second contact region 44 and the gasket 6. It has a second holding portion 722 connected to the second held portion 721 so as to abut the outer edge on the end face.

第２被保持部７２１は、同一円周上に所定の間隔を空けて形成される複数（ここでは、三つ）の第２被保持爪７２１ａから構成される。そして、第２被保持部７２１は、第１被保持部７１１上を摺動することができる。また、ガスケット６は、複数の第２被保持爪７２１ａ内で摺動することができる。第２被保持爪７２１ａは、第１被保持爪７１１ａと同様に、軸方向に延在して形成される。 The second held portion 721 is composed of a plurality of (here, three) second held claws 721a formed on the same circumference at predetermined intervals. Then, the second held portion 721 can slide on the first held portion 711. Further, the gasket 6 can slide in the plurality of second held claws 721a. The second held claw 721a is formed so as to extend in the axial direction in the same manner as the first held claw 711a.

また、第２被保持部７２１は、ナット部材３の雌ねじ３３と接触しないように第１被保持部７１１と雌ねじ３３との間に配置される。これにより、第２被保持部７２１の熱膨張による雌ねじ３３への食い込みを防止することができる。 Further, the second held portion 721 is arranged between the first held portion 711 and the female screw 33 so as not to come into contact with the female screw 33 of the nut member 3. As a result, it is possible to prevent the second held portion 721 from biting into the female screw 33 due to thermal expansion.

第２挟持部７２２は、第２被保持部７２１に接続される第２接続部７２３と、第２接続部７２３と径方向に重なるように第２接続部７２３に接続される第２増厚部７２４と、を有する。なお、第２挟持部７２２は、その厚み（すなわち、第２接続部７２３及び第２増厚部７２４の厚みの合計）が第１挟持部７１２の厚みと一致し、第２突起４５の突出量よりも僅かに小さい。 The second holding portion 722 is a second thickening portion connected to a second connecting portion 723 connected to the second held portion 721 and a second connecting portion 723 so as to radially overlap the second connecting portion 723. It has 724 and. The thickness of the second sandwiching portion 722 (that is, the total thickness of the second connecting portion 723 and the second thickening portion 724) matches the thickness of the first sandwiching portion 712, and the protrusion amount of the second protrusion 45 Slightly smaller than.

これにより、ナット部材３が第１継手部材２に締め付けられた状態において、第１当接領域２５からガスケット６の一方の端面までの距離と、第２当接領域４４からガスケット６の他方の端面までの距離とを同一にすることができる。さらに、上述したように、第１突起２６の突出量と第２突起４５の突出量とが一致するので、ガスケット６の一方の端面への第１突起２６の食い込み量（すなわち、第１突起２６の突出量と第１挟持部７１２の厚みとの差分）と、ガスケット６の他方の端面への第２突起４５の食い込み量（すなわち、第２突起４５の突出量と第２挟持部７２２の厚みとの差分）とを同一にすることができる。 As a result, in a state where the nut member 3 is tightened to the first joint member 2, the distance from the first contact region 25 to one end face of the gasket 6 and the distance from the second contact region 44 to the other end face of the gasket 6 Can be the same as the distance to. Further, as described above, since the protruding amount of the first protrusion 26 and the protruding amount of the second protrusion 45 match, the amount of biting of the first protrusion 26 into one end surface of the gasket 6 (that is, the first protrusion 26). (Difference between the amount of protrusion of the first protrusion 712 and the thickness of the first holding portion 712) and the amount of the second protrusion 45 biting into the other end surface of the gasket 6 (that is, the amount of protrusion of the second protrusion 45 and the thickness of the second holding portion 722). (Difference from) can be the same.

第２接続部７２３は、環状（具体的には、円環状）板から構成され、第２継手部材４の第２当接領域４４に当接する。第２接続部７２３の一方の端面における外周縁には、複数の第２被保持爪７２１ａが接続される。一方、第２接続部７２３の他方の端面における内周縁には、複数の第２増厚片７２４ａが接続される。 The second connecting portion 723 is composed of an annular (specifically, annular) plate and abuts on the second contact region 44 of the second joint member 4. A plurality of second held claws 721a are connected to the outer peripheral edge of one end surface of the second connecting portion 723. On the other hand, a plurality of second thickening pieces 724a are connected to the inner peripheral edge of the other end surface of the second connecting portion 723.

第２増厚部７２４は、ガスケット６の他方の端面における外縁に当接する。また、第２増厚部７２４は、同一円周上に所定の間隔を空けて形成される複数（ここでは、三つ）の第２増厚片７２４ａをそれぞれ径方向に折り曲げて構成される。なお、複数の第２増厚片７２４ａは、それぞれ複数の第２被保持爪７２１ａの位置に対応して設けられる。 The second thickening portion 724 abuts on the outer edge of the other end face of the gasket 6. Further, the second thickening portion 724 is formed by bending a plurality of (here, three) second thickening pieces 724a formed on the same circumference at predetermined intervals in the radial direction. The plurality of second thickening pieces 724a are provided corresponding to the positions of the plurality of second held claws 721a, respectively.

また、本実施形態では、第２挟持部７２２は、第２接続部７２３及び第２増厚部７２４の両方から構成されているが、これに限定されるものではなく、例えば、第２増厚部７２４を有することなく、第２接続部７２３のみから構成されてもよい。この場合、第２接続部７２３は、その厚みが本実施形態の第２接続部７２３及び第２増厚部７２４の厚みの合計となるように形成される。 Further, in the present embodiment, the second sandwiching portion 722 is composed of both the second connecting portion 723 and the second thickening portion 724, but the present invention is not limited to this, and for example, the second thickening portion 722 is thickened. It may be composed of only the second connection part 723 without having the part 724. In this case, the second connecting portion 723 is formed so that the thickness thereof is the total thickness of the second connecting portion 723 and the second thickening portion 724 of the present embodiment.

ガスケット６は、第１挟持部７１２と第２挟持部７２２との間に挟持されるように第１リテーナ７１及び第２リテーナ７２により保持される。これにより、ナット部材３が第１継手部材２に締め付けられた状態において、第１当接領域２５と第２当接領域４４との間のクリアランスは、ガスケット６、第１リテーナ７１の第１挟持部７１２及び第２リテーナ７２の第２挟持部７２２により保たれるので、ガスケット６への過剰締め付けを防止することができる。 The gasket 6 is held by the first retainer 71 and the second retainer 72 so as to be sandwiched between the first sandwiching portion 712 and the second sandwiching portion 722. As a result, in a state where the nut member 3 is tightened to the first joint member 2, the clearance between the first contact region 25 and the second contact region 44 is the first holding of the gasket 6 and the first retainer 71. Since it is held by the second holding portion 722 of the portion 712 and the second retainer 72, it is possible to prevent overtightening of the gasket 6.

次に、図３を参照しながら継手構造１を組み付ける継手構造１の組み付け方法について説明する。 Next, a method of assembling the joint structure 1 for assembling the joint structure 1 will be described with reference to FIG.

図３は、継手構造１を組み付ける継手構造１の組み付け方法を示すフローチャートである。 FIG. 3 is a flowchart showing an assembling method of the joint structure 1 for assembling the joint structure 1.

図３に示すように、まず、工程Ｓ１において、第１リテーナ７１と第２リテーナ７２との間に位置するようにガスケット６をリテーナ７に保持させる。具体的には、工程Ｓ１において、ガスケット６を第２リテーナ７２に収容させ、ガスケット６が収容された第２リテーナ７２を第１リテーナ７１に取り付ける。なお、このとき、ガスケット６は、第１リテーナ７１の第１挟持部７１２と第２リテーナ７２の第２挟持部７２２との間に位置する。 As shown in FIG. 3, first, in step S1, the gasket 6 is held by the retainer 7 so as to be located between the first retainer 71 and the second retainer 72. Specifically, in step S1, the gasket 6 is housed in the second retainer 72, and the second retainer 72 in which the gasket 6 is housed is attached to the first retainer 71. At this time, the gasket 6 is located between the first holding portion 712 of the first retainer 71 and the second holding portion 722 of the second retainer 72.

次に、工程Ｓ２において、ガスケット６が保持されたリテーナ７を第１継手部材２の外周面（具体的には、段差部２２）に取り付ける。具体的には、工程Ｓ２において、第２リテーナ７２が取り付けられた第１リテーナ７１を第１継手部材２の段差部２２に対し摺動させて外嵌する。 Next, in step S2, the retainer 7 holding the gasket 6 is attached to the outer peripheral surface (specifically, the step portion 22) of the first joint member 2. Specifically, in step S2, the first retainer 71 to which the second retainer 72 is attached is slid with respect to the stepped portion 22 of the first joint member 2 to be fitted externally.

次に、工程Ｓ３において、第２継手部材４をナット部材３に挿入する。具体的には、工程Ｓ３において、ベアリング５を第２継手部材４の外周面に取り付けた状態で、第２継手部材４をナット部材３の貫通孔３２に貫通させるようにナット部材３に挿入する。このとき、ベアリング５は、ナット部材３の底面部３１と第２継手部材４のフランジ４２との間に位置する。 Next, in step S3, the second joint member 4 is inserted into the nut member 3. Specifically, in step S3, with the bearing 5 attached to the outer peripheral surface of the second joint member 4, the second joint member 4 is inserted into the nut member 3 so as to penetrate through the through hole 32 of the nut member 3. .. At this time, the bearing 5 is located between the bottom surface portion 31 of the nut member 3 and the flange 42 of the second joint member 4.

次に、工程Ｓ４において、リテーナ７が第１当接領域２５と第２当接領域４４との間に挟持されるとともにナット部材３に挿入された第２継手部材４の端部が係止されるようにリテーナ７が取り付けられた第１継手部材２にナット部材３をねじ込む。 Next, in step S4, the retainer 7 is sandwiched between the first contact region 25 and the second contact region 44, and the end portion of the second joint member 4 inserted into the nut member 3 is locked. The nut member 3 is screwed into the first joint member 2 to which the retainer 7 is attached.

具体的には、工程Ｓ４において、第１継手部材２にナット部材３をねじ込むと、第１継手部材２の第１当接領域２５と第２継手部材４の第２当接領域４４との間のクリアランスが小さくなる。そして、第１リテーナ７１の第１挟持部７１２が第１当接領域２５とガスケット６の一方の端面における外縁とに当接するとともに第２リテーナ７２の第２挟持部７２２が第２当接領域４４とガスケット６の他方の端面における外縁とに当接すると、第１当接領域２５と第２当接領域４４との間のクリアランスが保たれる。したがって、ガスケット６への過剰締め付けを防止することができる。 Specifically, in step S4, when the nut member 3 is screwed into the first joint member 2, it is between the first contact region 25 of the first joint member 2 and the second contact region 44 of the second joint member 4. Clearance is reduced. Then, the first holding portion 712 of the first retainer 71 comes into contact with the first contact region 25 and the outer edge of one end surface of the gasket 6, and the second holding portion 722 of the second retainer 72 comes into contact with the second contact region 44. When the gasket 6 is brought into contact with the outer edge of the other end face of the gasket 6, the clearance between the first contact region 25 and the second contact region 44 is maintained. Therefore, it is possible to prevent overtightening of the gasket 6.

本実施形態では、継手構造１の組み付け方法は、工程Ｓ１、工程Ｓ２及び工程Ｓ３の順に行われているが、これに限定されるものではなく、例えば、工程Ｓ１、工程Ｓ３及び工程Ｓ２の順に行われてもよい。又は工程Ｓ３、工程Ｓ１及び工程Ｓ２の順に行われてもよい。 In the present embodiment, the method of assembling the joint structure 1 is performed in the order of step S1, step S2, and step S3, but the present invention is not limited to this, and for example, the steps S1, step S3, and step S2 are assembled in this order. It may be done. Alternatively, the process may be performed in the order of step S3, step S1 and step S2.

次に、本実施形態による作用効果について説明する。 Next, the action and effect of this embodiment will be described.

本実施形態に係る継手構造１は、内周に第１流体流路２１が形成されるとともに外周に雄ねじ２３が形成される第１継手部材２と、雄ねじ２３に螺合する雌ねじ３３を有するナット部材３と、内周に第２流体流路４１が形成され、端部がナット部材３内に係止される第２継手部材４と、第１継手部材２の突き合わせ端面２４と第２継手部材４の突き合わせ端面４３との間に介装されるガスケット６と、第１継手部材２の外周面に取り付けられる第１リテーナ７１と、着脱可能に第１リテーナ７１に取り付けられる第２リテーナ７２と、を有し、ガスケット６を第１リテーナ７１及び第２リテーナ７２により保持するリテーナ７と、を備える。第１継手部材２の突き合わせ端面２４には、第１リテーナ７１が当接する第１当接領域２５と、第１当接領域２５よりも内側に位置するとともにガスケット６の一方の端面に押し付けられる第１突起２６と、が設けられ、第２継手部材４の突き合わせ端面４３には、第２リテーナ７２が当接する第２当接領域４４と、第２当接領域４４よりも内側に位置するとともにガスケット６の他方の端面に押し付けられる第２突起４５と、が設けられ、リテーナ７は、第１当接領域２５と第２当接領域４４との間に挟持される。 The joint structure 1 according to the present embodiment has a first joint member 2 in which a first fluid flow path 21 is formed on the inner circumference and a male screw 23 is formed on the outer circumference, and a nut having a female screw 33 screwed into the male screw 23. The member 3, the second joint member 4 in which the second fluid flow path 41 is formed on the inner circumference and the end is locked in the nut member 3, the butt end surface 24 of the first joint member 2, and the second joint member. A gasket 6 interposed between the butt end surface 43 of 4 and a first retainer 71 attached to the outer peripheral surface of the first joint member 2, and a second retainer 72 detachably attached to the first retainer 71. The retainer 7 holds the gasket 6 by the first retainer 71 and the second retainer 72. The butt end surface 24 of the first joint member 2 is located inside the first contact area 25 with which the first retainer 71 abuts and the first contact area 25, and is pressed against one end surface of the gasket 6. A protrusion 26 is provided, and a second contact area 44 with which the second retainer 72 abuts and a gasket located inside the second contact area 44 on the butt end surface 43 of the second joint member 4. A second protrusion 45, which is pressed against the other end face of 6, is provided, and the retainer 7 is sandwiched between the first contact region 25 and the second contact region 44.

本実施形態に係る継手構造１の組み付け方法は、第１リテーナ７１と第２リテーナ７２との間に位置するようにガスケット６をリテーナ７に保持させる工程Ｓ１と、ガスケット６が保持されたリテーナ７を第１継手部材２の外周面に取り付ける工程Ｓ２と、第２継手部材４をナット部材３に挿入する工程Ｓ３と、リテーナ７が第１当接領域２５と第２当接領域４４との間に挟持されるとともにナット部材３に挿入された第２継手部材４の端部が係止されるようにリテーナ７が取り付けられた第１継手部材２にナット部材３をねじ込む工程Ｓ４と、を備える。 The method of assembling the joint structure 1 according to the present embodiment includes a step S1 of holding the gasket 6 in the retainer 7 so as to be located between the first retainer 71 and the second retainer 72, and a retainer 7 in which the gasket 6 is held. Is attached to the outer peripheral surface of the first joint member 2, the step S3 of inserting the second joint member 4 into the nut member 3, and the retainer 7 between the first contact region 25 and the second contact region 44. A step S4 of screwing the nut member 3 into the first joint member 2 to which the retainer 7 is attached so that the end portion of the second joint member 4 sandwiched between the nut members 3 and inserted into the nut member 3 is locked. ..

これらの構成によれば、ナット部材３が第１継手部材２に締め付けられた状態において、第１当接領域２５と第２当接領域４４との間のクリアランスは、ガスケット６、第１リテーナ７１及び第２リテーナ７２の存在により保たれるので、ガスケット６への過剰締め付けを防止することができる。 According to these configurations, when the nut member 3 is tightened to the first joint member 2, the clearance between the first contact region 25 and the second contact region 44 is the gasket 6 and the first retainer 71. And because it is maintained by the presence of the second retainer 72, it is possible to prevent overtightening of the gasket 6.

また、第１リテーナ７１及び第２リテーナ７２は、それぞれ第１当接領域２５及び第２当接領域４４に当接するので、第１継手部材２の突き合わせ端面２４及び第２継手部材４の突き合わせ端面４３に過剰締め付け防止用の突起を別途設ける必要がない。このため、第１継手部材２及び第２継手部材４の簡素化を図ることができる。 Further, since the first retainer 71 and the second retainer 72 abut on the first contact region 25 and the second contact region 44, respectively, the butt end surface 24 of the first joint member 2 and the butt end surface of the second joint member 4 It is not necessary to separately provide a protrusion for preventing overtightening on 43. Therefore, the first joint member 2 and the second joint member 4 can be simplified.

さらに、第２リテーナ７２は、着脱可能に第１リテーナ７１に取り付けられるので、メンテナンス又は部品の交換時に第１リテーナ７１と第２リテーナ７２とを分離させることで、ガスケット６を容易に取り外すことができる。 Further, since the second retainer 72 is detachably attached to the first retainer 71, the gasket 6 can be easily removed by separating the first retainer 71 and the second retainer 72 at the time of maintenance or replacement of parts. it can.

また、本実施形態では、第１リテーナ７１は、第１継手部材２の外周面に保持される第１被保持部７１１と、第１当接領域２５とガスケット６の一方の端面における外縁とに当接するように第１被保持部７１１に接続される第１挟持部７１２と、を有し、第２リテーナ７２は、第１被保持部７１１に保持されガスケット６を収容する第２被保持部７２１と、第２当接領域４４とガスケット６の他方の端面における外縁とに当接するように第２被保持部７２１に接続される第２挟持部７２２と、を有する。ガスケット６は、第１挟持部７１２と第２挟持部７２２との間に挟持される。 Further, in the present embodiment, the first retainer 71 is provided on the first held portion 711 held on the outer peripheral surface of the first joint member 2, and on the outer edge of the first contact region 25 and one end surface of the gasket 6. The second retainer 72 has a first holding portion 712 connected to the first held portion 711 so as to be in contact with the first held portion 711, and the second retainer 72 is held by the first held portion 711 and houses the gasket 6. It has a 721 and a second holding portion 722 connected to the second held portion 721 so as to abut the second contact region 44 and the outer edge of the gasket 6 on the other end surface. The gasket 6 is sandwiched between the first sandwiching portion 712 and the second sandwiching portion 722.

この構成によれば、ナット部材３が第１継手部材２に締め付けられた状態において、第１当接領域２５と第２当接領域４４との間のクリアランスは、ガスケット６、第１リテーナ７１の第１挟持部７１２及び第２リテーナ７２の第２挟持部７２２により保たれるので、ガスケット６への過剰締め付けを防止することができる。 According to this configuration, when the nut member 3 is tightened to the first joint member 2, the clearance between the first contact region 25 and the second contact region 44 is set by the gasket 6 and the first retainer 71. Since it is held by the second holding portion 722 of the first holding portion 712 and the second retainer 72, it is possible to prevent overtightening of the gasket 6.

また、本実施形態では、第１挟持部７１２は、第１被保持部７１１に接続される第１接続部７１３と、第１接続部７１３と重なるように第１接続部７１３に接続される第１増厚部７１４と、を有し、第２挟持部７２２は、第２被保持部７２１に接続される第２接続部７２３と、第２接続部７２３と重なるように第２接続部７２３に接続される第２増厚部７２４と、を有する。 Further, in the present embodiment, the first holding portion 712 is connected to the first connecting portion 713 connected to the first held portion 711 and the first connecting portion 713 so as to overlap the first connecting portion 713. The second holding portion 722 has one thickening portion 714, and the second holding portion 722 is connected to the second connecting portion 723 connected to the second held portion 721 and the second connecting portion 723 so as to overlap the second connecting portion 723. It has a second thickening portion 724 to be connected.

この構成によれば、第１挟持部７１２及び第２挟持部７２２を容易に形成することができる。 According to this configuration, the first sandwiching portion 712 and the second sandwiching portion 722 can be easily formed.

また、本実施形態では、第２被保持部７２１は、ナット部材３の雌ねじ３３と接触しないように第１被保持部７１１と雌ねじ３３との間に配置される。 Further, in the present embodiment, the second held portion 721 is arranged between the first held portion 711 and the female screw 33 so as not to come into contact with the female screw 33 of the nut member 3.

この構成によれば、第２被保持部７２１の熱膨張による雌ねじ３３への食い込みを防止することができる。 According to this configuration, it is possible to prevent the second held portion 721 from biting into the female screw 33 due to thermal expansion.

また、本実施形態では、ガスケット６は、形状記憶合金から構成される。 Further, in the present embodiment, the gasket 6 is made of a shape memory alloy.

この構成によれば、ガスケット６への過剰締め付けによるガスケット６の潰れ（破壊）を防止することができるので、ガスケット６の形状記憶機能を維持することができる。 According to this configuration, it is possible to prevent the gasket 6 from being crushed (broken) due to excessive tightening on the gasket 6, so that the shape memory function of the gasket 6 can be maintained.

以上、本実施形態について説明したが、上述した実施形態は、本発明の適用例の一部を示したに過ぎず、本発明の技術的範囲を上述した実施形態の具体的構成に限定する趣旨ではない。 Although the present embodiment has been described above, the above-described embodiment shows only a part of the application examples of the present invention, and the purpose is to limit the technical scope of the present invention to the specific configuration of the above-described embodiment. is not it.

（変形例）
上述した実施形態では、第１リテーナ７１の第１被保持部７１１は、第１継手部材２の外周面に取り付けられているが、これに限定されるものではなく、例えば、第２継手部材４の外周面に取り付けられてもよい。この場合、ナット部材３の雌ねじ３３は、上述した実施形態よりもナット部材３の底面部３１側に形成される。 (Modification example)
In the above-described embodiment, the first held portion 711 of the first retainer 71 is attached to the outer peripheral surface of the first joint member 2, but the present invention is not limited to this, and for example, the second joint member 4 It may be attached to the outer peripheral surface of the. In this case, the female screw 33 of the nut member 3 is formed on the bottom surface portion 31 side of the nut member 3 as compared with the above-described embodiment.

また、上述した実施形態では、第１リテーナ７１における第１被保持部７１１及び第１挟持部７１２の第１接続部７１３は、それぞれ複数の第１被保持爪７１１ａ及び環状板から構成されているが、これに限定されるものではなく、例えば、それぞれ筒状（具体的には、円筒状）部及び筒状部に所定の間隔を空けて形成される複数の爪部から構成されてもよい。この場合、第１接続部７１３としての複数の爪部には、それぞれ複数の第１増厚部７１４が接続される。これにより、第２リテーナ７２の第２被保持部７２１が第１リテーナ７１の第１被保持部７１１に対し相対的に回転して第１被保持部７１１から脱落してしまうことを無くすことができるので、第２被保持部７２１を第１被保持部７１１により確実に保持することができる。 Further, in the above-described embodiment, the first holding portion 711 of the first retainer 71 and the first connecting portion 713 of the first holding portion 712 are each composed of a plurality of first held claws 711a and an annular plate. However, the present invention is not limited to this, and may be composed of, for example, a tubular (specifically, cylindrical) portion and a plurality of claw portions formed at predetermined intervals in the tubular portion, respectively. .. In this case, a plurality of first thickening portions 714 are connected to each of the plurality of claw portions as the first connecting portion 713. As a result, it is possible to prevent the second held portion 721 of the second retainer 72 from rotating relative to the first held portion 711 of the first retainer 71 and falling off from the first held portion 711. Therefore, the second held portion 721 can be reliably held by the first held portion 711.

また、上述した実施形態では、第２リテーナ７２における第２被保持部７２１及び第２挟持部７２２の第２接続部７２３は、それぞれ複数の第２被保持爪７２１ａ及び環状板から構成されているが、これに限定されるものではなく、例えば、それぞれ筒状（具体的には、円筒状）部及び筒状部に所定の間隔を空けて形成される複数の爪部から構成されてもよい。この場合、第２接続部７２３としての複数の爪部には、それぞれ複数の第２増厚部７２４が接続される。これにより、第２リテーナ７２の第２被保持部７２１が第１リテーナ７１の第１被保持部７１１に対し相対的に回転して第１被保持部７１１から脱落してしまうことを無くすことができるので、第２被保持部７２１を第１被保持部７１１により確実に保持することができる。 Further, in the above-described embodiment, the second holding portion 721 of the second retainer 72 and the second connecting portion 723 of the second holding portion 722 are each composed of a plurality of second held claws 721a and an annular plate. However, the present invention is not limited to this, and may be composed of, for example, a tubular (specifically, cylindrical) portion and a plurality of claw portions formed at predetermined intervals in the tubular portion, respectively. .. In this case, a plurality of second thickening portions 724 are connected to each of the plurality of claw portions as the second connecting portion 723. As a result, it is possible to prevent the second held portion 721 of the second retainer 72 from rotating relative to the first held portion 711 of the first retainer 71 and falling off from the first held portion 711. Therefore, the second held portion 721 can be reliably held by the first held portion 711.

また、上述した実施形態では、第１突起２６の突出量及び第１挟持部７１２の厚みは、それぞれ第２突起４５の突出量及び第２挟持部７２２の厚みと一致しているが、これに限定されるものではなく、例えば、それぞれ第２突起４５の突出量及び第２挟持部７２２の厚みと異なってもよい。この場合、ガスケット６の一方の端面への第１突起２６の食い込み量（すなわち、第１突起２６の突出量と第１挟持部７１２の厚みとの差分）と、ガスケット６の他方の端面への第２突起４５の食い込み量（すなわち、第２突起４５の突出量と第２挟持部７２２の厚みとの差分）とが一致すれば足りる。 Further, in the above-described embodiment, the protruding amount of the first protrusion 26 and the thickness of the first holding portion 712 are the same as the protruding amount of the second protrusion 45 and the thickness of the second holding portion 722, respectively. It is not limited, and may be different from, for example, the amount of protrusion of the second protrusion 45 and the thickness of the second sandwiching portion 722, respectively. In this case, the amount of bite of the first protrusion 26 into one end face of the gasket 6 (that is, the difference between the amount of protrusion of the first protrusion 26 and the thickness of the first sandwiching portion 712) and the thickness of the first holding portion 712 into the other end face of the gasket 6. It suffices if the biting amount of the second protrusion 45 (that is, the difference between the protruding amount of the second protrusion 45 and the thickness of the second sandwiching portion 722) matches.

１継手構造
２第１継手部材
３ナット部材
４第２継手部材
６ガスケット
７リテーナ（保持手段）
２１第１流体流路
２２凹部（保持部）
２３雄ねじ
２４突き合わせ端面（第１継手部材側）
２５第１当接領域
２６第１突起
３３雌ねじ
４１第２流体流路
４３突き合わせ端面（第２継手部材側）
４４第２当接領域
４５第２突起
７１第１リテーナ
７２第２リテーナ
７１１第１被保持部
７１２第１挟持部
７１３第１接続部
７１４第１増厚部
７２２第２挟持部
７２３第２接続部
７２４第２増厚部 1 Joint structure 2 1st joint member 3 Nut member 4 2nd joint member 6 Gasket 7 Retainer (holding means)
21 First fluid flow path 22 Recess (holding part)
23 Male screw 24 Butted end face (first joint member side)
25 First contact area 26 First protrusion 33 Female screw 41 Second fluid flow path 43 Butted end face (second joint member side)
44 Second contact area 45 Second protrusion 71 First retainer 72 Second retainer 711 First held portion 712 First holding portion 713 First connecting portion 714 First thickening portion 722 Second holding portion 723 Second connecting portion 724 Second thickening part

Claims

A first joint member in which a first fluid flow path is formed on the inner circumference and a male screw is formed on the outer circumference.
A nut member having a female screw to be screwed into the male screw,
A second joint member in which a second fluid flow path is formed on the inner circumference and an end thereof is locked in the nut member.
A gasket interposed between the butt end face of the first joint member and the butt end face of the second joint member.
It has a first retainer attached to the first joint member or the outer peripheral surface of the second joint member, and a second retainer detachably attached to the first retainer, and the gasket is attached to the first retainer and the first retainer. Provided with a holding means held by a second retainer,
The butt end face of the first joint member is located inside the first contact region and the first contact region where either one of the first retainer and the second retainer abuts, and the first contact region is located inside. A first protrusion, which is pressed against one end face of the gasket, is provided.
The butt end faces of the second joint member are located inside the second contact region and the second contact region where any one of the first retainer and the second retainer abuts, and the above. A second protrusion, which is pressed against the other end face of the gasket, is provided.
The holding means is sandwiched between the first contact area and the second contact area.
Joint structure.

The first retainer is
A first held portion held on the outer peripheral surface of the first joint member or the second joint member, and
It has one of the first contact region and the second contact region, and a first holding portion connected to the first held portion so as to abut the gasket.
The second retainer is
A second held portion held by the first held portion and accommodating the gasket,
It has a first contact region, any one of the second contact regions, and a second holding portion connected to the second held portion so as to abut the gasket.
The gasket is sandwiched between the first sandwiching portion and the second sandwiching portion.
The joint structure according to claim 1.

The first holding portion is
The first connecting portion connected to the first held portion and
It has a first thickened portion connected to the first connecting portion so as to overlap the first connecting portion.
The second holding portion is
The second connecting portion connected to the second held portion and
It has a second thickened portion connected to the second connecting portion so as to overlap the second connecting portion.
The joint structure according to claim 2.

The second held portion is arranged between the first held portion and the female screw so as not to come into contact with the female screw of the nut member.
The joint structure according to claim 2 or 3.

The gasket is made of a shape memory alloy.
The joint structure according to any one of claims 1 to 4.

A method for assembling a joint structure according to any one of claims 1 to 5.
A step of causing the holding means to hold the gasket so as to be located between the first retainer and the second retainer.
A step of attaching the holding means on which the gasket is held to the first joint member or the outer peripheral surface of the second joint member, and
The step of inserting the second joint member into the nut member and
The first holding means is sandwiched between the first contact area and the second contact area, and the end portion of the second joint member inserted into the nut member is locked. The step of screwing the nut member into the joint member is provided.
How to assemble the joint structure.