JP5707093B2

JP5707093B2 - Pipe connection structure and hose fittings

Info

Publication number: JP5707093B2
Application number: JP2010240375A
Authority: JP
Inventors: 桝野　哲朗; 哲朗桝野; 伸一位田
Original assignee: Nichirin Co Ltd
Current assignee: Nichirin Co Ltd
Priority date: 2010-10-27
Filing date: 2010-10-27
Publication date: 2015-04-22
Anticipated expiration: 2030-10-27
Also published as: JP2012092897A

Description

本発明は、車輌用フレキシブルホース等に用いられる管体の接続構造及びホース継手金具に係り、より詳しくは、車輌用ブレーキホース、クラッチホース或いはパワーステアリングホース等に用いられる管体の接続構造及びホース継手金具に関するものである。 The present invention relates to a tube connection structure and a hose fitting used in a vehicle flexible hose and the like, and more particularly, to a tube connection structure and a hose used in a vehicle brake hose, clutch hose, power steering hose and the like. The present invention relates to joint fittings.

ホースを油圧発生源（油圧ポンプ）や作用点（ブレーキ配管におけるキャリパー等）に接続する方法として、継手金具を介して接続する方法がある。そして、例えば自動車用ブレーキ配管の場合、前記継手金具として、一般的にＪＡＳＯＭ１０１ＴＤＷ（二重巻配管）が使用されている。 As a method of connecting the hose to a hydraulic pressure generation source (hydraulic pump) or an action point (such as a caliper in a brake pipe), there is a method of connecting via a joint fitting. For example, in the case of a brake pipe for automobiles, JASO M101 TDW (double winding pipe) is generally used as the joint fitting.

この様な継手金具を介して接続する従来例に係る管体の接続構造につき、以下添付図８〜１１を参照しながら説明する。図８は従来技術１に係る継手金具の部分断面図、図９は従来技術２に係り、金属チューブを可撓性ホースに結合するために使用する、ろう付された結合部の断面図、図１０は従来技術３に係るブレーキパイプ及び口金具の全体を示す部分断面正面図、図１１は従来技術４に係り、図（ａ）は管体の接続構造の一実施例を示す正断面図、図（ｂ）は図（ａ）のクランプ部材を示す側断面図である。 A pipe connection structure according to a conventional example that is connected via such a fitting will be described below with reference to FIGS. FIG. 8 is a partial cross-sectional view of a joint fitting according to Prior Art 1, and FIG. 9 is a cross-sectional view of a brazed joint used to join a metal tube to a flexible hose according to Prior Art 2, FIG. 10 is a partial cross-sectional front view showing the entire brake pipe and fitting according to Prior Art 3, FIG. 11 is related to Prior Art 4, and FIG. 11 (a) is a front cross-sectional view showing an embodiment of a pipe connection structure; Fig. (B) is a side sectional view showing the clamp member of Fig. (A).

従来技術１に係る継手金具２０は、外筒２２と内筒２４とから構成されている。外筒２２は、中間部外周にフランジ２６が形成された円筒体で、フランジ２６の一方側にゴムホース圧着部２８が形成され、他方側にねじ接続部２５が形成されている。そして、内筒２４は、ゴムホース圧着部２８と同心状に内側にあって、その一端側にブレーキホースとしてのゴムホース２９の端部が挿入された後、前記ゴムホース圧着部２８を加締めて接続される。 The joint fitting 20 according to the prior art 1 includes an outer cylinder 22 and an inner cylinder 24. The outer cylinder 22 is a cylindrical body in which a flange 26 is formed on the outer periphery of the intermediate portion. A rubber hose crimping portion 28 is formed on one side of the flange 26 and a screw connection portion 25 is formed on the other side. The inner cylinder 24 is concentrically inside the rubber hose crimping portion 28, and after the end of a rubber hose 29 as a brake hose is inserted into one end thereof, the rubber hose crimping portion 28 is crimped and connected. The

一方、ねじ接続部２５は、フレアナット３２のねじ部３４が螺合される。このフレアナット３２には、ブレーキパイプ３６が挿通されており、このブレーキパイプ３６の先端には、拡径されたフレア部３８が形成されている。従って、フレアナット３２をねじ接続部２５に締め付けることによって、フレア部３８と内筒２４の他端側に形成された固定部材２１のシート部２３とが圧着され、ブレーキパイプ３６とゴムホース２９とが内筒２４を介して接続される（特許文献１参照）。 On the other hand, the screw connection portion 25 is screwed with the screw portion 34 of the flare nut 32. A brake pipe 36 is inserted into the flare nut 32, and a flare portion 38 having an enlarged diameter is formed at the tip of the brake pipe 36. Therefore, by tightening the flare nut 32 to the screw connection portion 25, the flare portion 38 and the seat portion 23 of the fixing member 21 formed on the other end side of the inner cylinder 24 are pressure-bonded, and the brake pipe 36 and the rubber hose 29 are connected. It connects via the inner cylinder 24 (refer patent document 1).

しかしながら、この従来技術１に係る継手金具２０は、ねじ接続部２５にねじ部３４をねじ込む手間がかかる上、フレア部３８とシート部２３のシール性は、ねじ接続部２５とねじ部３４の加工精度、ねじ込み時のブレーキパイプ３６とねじ接続部２５の軸心ずれ、或いは表面処理による摩擦の不均一等に起因する片当たり等の不具合を生じることが多々あり、シビアな管理が要求される。そのため、潤滑油を塗布してねじ込み、上記不具合を緩和させる方法があるが、潤滑油を塗布する手間を要する。 However, in the joint fitting 20 according to the related art 1, it takes time and labor to screw the screw portion 34 into the screw connection portion 25, and the sealing performance of the flare portion 38 and the seat portion 23 is that the processing of the screw connection portion 25 and the screw portion 34 is performed. There are many cases in which defects such as accuracy or a misalignment due to misalignment of the friction caused by the surface treatment or the misalignment of the brake pipe 36 and the screw connection portion 25 during screwing occur, and severe management is required. For this reason, there is a method of applying the lubricating oil and screwing in to alleviate the above-mentioned problem, but it takes time and effort to apply the lubricating oil.

従来技術２に係るカップリングは、金属チューブ４０がホースを接続する管継手４１の凹部４２に押圧して嵌合され、接続部４３において銅ろう付されている。前記管継手４１は、通常ろう付後めっき処理される（特許文献２参照）。前記金属チューブ４０が、二重巻鋼管（ＴＤＷ）により形成されている場合、ＴＤＷは通常、耐食性を向上させる目的から、ふっ素樹脂やポリアミドのコーティングが施されている。 In the coupling according to the related art 2, the metal tube 40 is pressed and fitted into the concave portion 42 of the pipe joint 41 connecting the hose, and the connection portion 43 is brazed with copper. The pipe joint 41 is usually plated after brazing (see Patent Document 2). When the metal tube 40 is formed of a double-rolled steel pipe (TDW), the TDW is usually coated with a fluororesin or polyamide for the purpose of improving the corrosion resistance.

しかしながら、この従来技術２に係るカップリングでは、高温の炉に前記金属チューブ４０と管継手４１を投入してろう付加工しており、ふっ素樹脂やポリアミドのコーティングを施すことが不可能である。そのため、表面処理としては電気めっきを実施しているが、ＴＤＷの耐食性は、ふっ素樹脂やポリアミドのコーティングに比べて劣るものである。 However, in the coupling according to this prior art 2, the metal tube 40 and the pipe joint 41 are put into a high-temperature furnace and brazing is performed, and it is impossible to apply a fluororesin or polyamide coating. Therefore, although electroplating is performed as the surface treatment, the corrosion resistance of TDW is inferior to that of a fluororesin or polyamide coating.

次に、従来技術３に係るブレーキパイプ５０は、口金具のホース圧着部５１へ内挿され、ブレーキホース５２の穴内へ挿入された状態で前記ホース圧着部５１を加締めて前記ブレーキホース５２に固定される、金属パイプを絞り加工して形成されたニップル部（小径部）５０Ａと、前記固定されるニップル部５０Ａと一体成形され、前記ホース圧着部５１に連通する貫通穴５４Ａを貫通する大径部とで構成され、前記ニップル部５０Ａと大径部の間に、前記ホース圧着部５１と貫通穴５４Ａとの間に設けられた隔壁に突き当てられるビード部５０Ｂが形成され、前記口金具のホース圧着部５１が大径部へ挿入され、前記ビード部５０Ｂに前記隔壁が突き当てられ、隔壁のホース圧着部５１側端面の一部が、軸心方向にホース圧着部５１より前記大径部に向かって加締められることで固定されている（特許文献３参照）。 Next, the brake pipe 50 according to the prior art 3 is inserted into the hose crimping portion 51 of the metal fitting, and the hose crimping portion 51 is crimped to the brake hose 52 while being inserted into the hole of the brake hose 52. A fixed nipple portion (small-diameter portion) 50A formed by drawing a metal pipe and a large piercing through hole 54A that is integrally formed with the fixed nipple portion 50A and communicates with the hose crimping portion 51. A bead portion 50B that is abutted against a partition wall provided between the hose crimping portion 51 and the through hole 54A is formed between the nipple portion 50A and the large diameter portion. Hose crimping portion 51 is inserted into the large-diameter portion, the partition wall is abutted against the bead portion 50B, and a part of the end surface of the partition wall on the hose crimping portion 51 side is in front of the hose crimping portion 51 in the axial direction. It is fixed by being caulked toward the large-diameter portion (see Patent Document 3).

従来技術３に係るブレーキパイプ５０によれば、ホース５２を接続する部分のニップル部５０Ａは、ホース５２を挿入できるサイズにまで縮径する必要がある一方、ブレーキホース５２は、ＪＩＳＤ２６０１，ＦＭＶＳＳＮｏ．１０６等で最小内径が決められている。そのため、ニップル部５０Ａの内径を確保しつつ、外径をホース５２が挿入できる径まで縮径しなければならず、非常に難しい加工が必要となる。即ち、ＴＤＷを縮径する際、コーティングが剥がれる危険性が極めて高く、ニップル部５０Ａの耐食性に問題を生じる。ＴＤＷは鋼板を二重巻したパイプであるため、外周に巻目段差が存在するが、ニップル部５０Ａに段差が生じるとブレーキオイルが巻目段差を伝わり、オイル漏れする可能性がある。また、巻目段差部に鋼板の剥れが生じる可能性もある。 According to the brake pipe 50 according to the prior art 3, the nipple portion 50A that connects the hose 52 needs to be reduced in diameter to a size that allows the hose 52 to be inserted, while the brake hose 52 is JIS D 2601, FMVSS. No. The minimum inner diameter is determined by 106 or the like. Therefore, it is necessary to reduce the outer diameter to a diameter at which the hose 52 can be inserted while securing the inner diameter of the nipple portion 50A, and very difficult processing is required. That is, when the diameter of the TDW is reduced, there is an extremely high risk that the coating will be peeled off, causing a problem in the corrosion resistance of the nipple portion 50A. Since TDW is a pipe in which a steel plate is wound twice, there is a winding step on the outer periphery. However, if a step occurs in the nipple portion 50A, brake oil may be transmitted through the winding step and oil leakage may occur. Moreover, peeling of the steel plate may occur at the step portion of the winding.

更に、従来技術４に係る管体の接続構造によれば、第１の管体６１の端部に先端に向けて拡径して形成される第１のテーパ部６１ａと、前記第１の管体６１に外側に向けて突出して形成される第１の突出部６１ｂと、第２の管体６３の端部に先端に向けて縮径して形成され前記第１のテーパ部６１ａに挿通される第２のテーパ部６３ａと、前記第２の管体６３に前記第２のテーパ部６３ａの後方に外側に向けて突出して形成される第２の突出部６３ｂと、前記第１の突出部６１ｂと第２の突出部６３ｂの外側に配置され前記第１の突出部６１ｂと第２の突出部６３ｂとを対向する方向に押圧する連結手段６５とを備えている（特許文献４参照）。 Furthermore, according to the connection structure of the tubular body according to the related art 4, the first tapered portion 61a formed by expanding the diameter toward the tip at the end of the first tubular body 61, and the first tube A first projecting portion 61b that projects outward from the body 61, and a diameter that is reduced toward the tip of the end of the second tubular body 63, and is inserted through the first tapered portion 61a. A second tapered portion 63a, a second projecting portion 63b formed on the second tubular body 63 so as to project outward from the rear of the second tapered portion 63a, and the first projecting portion. 61b and a connecting means 65 arranged on the outside of the second projecting portion 63b to press the first projecting portion 61b and the second projecting portion 63b in a facing direction (see Patent Document 4).

しかしながら、前記連結手段６５は、クランプ部材６７をボルト６８とナット６９により連結するものであるから、連結作業に手間がかかる上、部外者でも容易に解除される。また、ねじ込みによる締付力が管軸方向ではないため、接合面に負荷される面圧を強くできず、高圧用途には不向きである。 However, since the connecting means 65 connects the clamp member 67 with the bolt 68 and the nut 69, the connecting work takes time and can be easily released even by an outsider. Further, since the tightening force due to screwing is not in the tube axis direction, the surface pressure applied to the joint surface cannot be increased, which is not suitable for high pressure applications.

特開平７−２７２７１号公報Japanese Patent Laid-Open No. 7-27271 米国特許出願公開第２００２／００９６８７７号明細書US Patent Application Publication No. 2002/0096877 特許第４２９３７６９号公報Japanese Patent No. 4293769 特開平９−６０７７５号公報Japanese Patent Laid-Open No. 9-60775

従って、本発明の目的は、ねじ込み作業等の面倒な接続作業が不要な上、耐食性も優れ、短時間に高精度な接続が可能な管体の接続構造及びホース継手金具を提供することである。 Accordingly, an object of the present invention is to provide a pipe connection structure and a hose fitting that do not require a troublesome connection work such as a screwing work, have excellent corrosion resistance, and enable high-precision connection in a short time. .

本発明は、上記実情に鑑みてなされたものであって、従って上記課題を解決するために、本発明の請求項１に係る管体の接続構造が採用した手段は、略筒形状を有する接続部材内で、第１の管体の一端側と第２の管体の一端側が当接して接合される管体の接続構造であって、前記第１の管体の一端側に形成された第１周状突出部の軸心方向先端側に第１接合面が設けられる一方、前記第２の管体の一端側に形成された第２周状突出部の軸心方向先端側に第２接合面が設けられ、前記接続部材には接続部が設けられると共に、この接続部は、前記接続部材の一端側から軸心方向に順に、前記第１の管体に形成された第１周状突出部が挿通可能な第１開孔部と、前記第２の管体に形成された第２周状突出部が挿通可能な第２開孔部とが、同一または異なる内径を有して同心状に形成されたものである。 The present invention has been made in view of the above circumstances. Therefore, in order to solve the above-mentioned problems, the means employed by the tube connection structure according to claim 1 of the present invention is a connection having a substantially cylindrical shape. A connecting structure for connecting a tubular body in which a first end of the first tubular body and a first end of the second tubular body are in contact with each other and formed on one end of the first tubular body. A first joint surface is provided on the distal end side in the axial direction of the one-circular protrusion, and a second joint is provided on the distal end side in the axial direction of the second peripheral protrusion formed on one end side of the second tubular body. The connection member is provided with a connection portion, and the connection portion is formed in a first circumferential protrusion formed on the first tubular body in the axial direction from one end side of the connection member. The first opening part through which the part can be inserted and the second opening part through which the second circumferential protrusion formed in the second tubular body can be inserted are the same or And it is formed concentrically with a different inner diameter.

同時に、前記第１開孔部に前記第１の管体が他端側から挿通され、次いで、前記第２開孔部に前記第２の管体に形成された第２周状突出部が挿通されて、前記第１の管体の第１接合面に前記第２の管体の第２接合面が当接され、前記第１開孔部における接続部材の軸心方向一端側の接続部端面を前記接続部材の一端側から他端側へ軸心方向に塑性変形させて第１内周返り部を、前記第２開孔部における接続部材の軸心方向他端側の接続部端面を前記接続部材の他端側から一端側へ軸心方向に塑性変形させて第２内周返り部を同時に形成し、これら接続部材内部に形成された前記接続部の第１内周返り部と第２内周返り部とによって、前記第１周状突出部と第２周状突出部とを両側から挟み込んで接合し、前記第１の管体と第２の管体とが接続されてなり、前記第１接合面には先端に向かって凹状のテーパ面が形成されるとともに、前記第２接合面には先端に向かって凸状のテーパ面が形成されてなり、前記第１接合面のテーパ角と前記第２接合面のテーパ角とは傾斜角度が逆向きであって、前記第１接合面のテーパ角は前記第２接合面のテーパ角よりも大きいことを特徴とするものである。 At the same time, the first tubular body is inserted into the first opening portion from the other end side, and then the second circumferential protrusion formed in the second tubular body is inserted into the second opening portion. Then, the second joint surface of the second tubular body is brought into contact with the first joint surface of the first tubular body, and the connection portion end surface on one end side in the axial direction of the connection member in the first opening portion Is deformed plastically in the axial direction from one end side to the other end side of the connecting member, and the first inner peripheral return portion is formed, and the connecting portion end face on the other end side in the axial direction of the connecting member in the second opening portion is A second inner peripheral return portion is formed simultaneously by plastic deformation in the axial direction from the other end side to the one end side of the connection member, and the first inner peripheral return portion and the second of the connection portion formed inside these connection members. The first circumferential projection and the second circumferential projection are sandwiched and joined from both sides by an inner turn portion, and the first tubular body and the second tubular body are connected. Ri Na is, together with the concave tapered surface toward the tip in the first joint surface is formed, it is convex tapered surface formed toward the tip in the second joint surface, said first The taper angle of the first joint surface is opposite to the taper angle of the second joint surface, and the taper angle of the first joint surface is larger than the taper angle of the second joint surface. To do.

本発明の請求項２に係る管体の接続構造が採用した手段は、請求項１に記載の管体の接続構造において、前記第１周状突出部が、前記第１接合面を有して前記第１の管体から独立した環状シール部材を形成されてなることを特徴とするものである。 According to a second aspect of the present invention, there is provided the pipe connecting structure according to the first aspect, wherein the first circumferential protrusion has the first joint surface. An annular seal member independent from the first tube is formed.

本発明の請求項３に係る管体の接続構造が採用した手段は、請求項１に記載の管体の接続構造において、前記第１周状突出部がフレアを形成されてなることを特徴とするものである。 Means connecting structure of the pipe body according to claim 3 is employed in the present invention, the feature that the connecting structure of the pipe body according to claim 1, comprising the first circumferential protrusion is formed to flare To do.

本発明の請求項４に係る管体の接続構造が採用した手段は、請求項１乃至３の何れか一つの項に記載の管体の接続構造において、前記第１接合面及び第２接合面の間にシールリングが介装されてなることを特徴とするものである。 According to a fourth aspect of the present invention, there is provided the tubular body connecting structure according to any one of the first to third aspects, wherein the first joint surface and the second joint surface are used. A seal ring is interposed between the two.

本発明の請求項５に係る管体の接続構造が採用した手段は、請求項１乃至４の何れか一つの項に記載の管体の接続構造において、前記第１の管体、第２の管体及び接続部材が、接合される前にめっきまたは／及びコーティングからなる表面処理を施されてなることを特徴とするものである。 The means adopted by the pipe connection structure according to claim 5 of the present invention is the pipe connection structure according to any one of claims 1 to 4 , wherein the first pipe, the second pipe The tube body and the connecting member are subjected to a surface treatment made of plating or / and coating before being joined.

本発明の請求項６に係るホース継手金具が採用した手段は、前記第１の管体が金属管、前記第２の管体がホース継手用金具のニップルであって、前記接続部材にこのニップルと同心状のホース加締部が形成された、請求項１乃至５の何れか一つの項に記載の管体の接続構造を有してなることを特徴とするものである。 The means adopted by the hose fitting according to claim 6 of the present invention is that the first tube is a metal tube and the second tube is a nipple of a hose fitting, and the nipple is attached to the connecting member. The tube connecting structure according to any one of claims 1 to 5 , wherein a hose caulking portion concentric with the tube is formed.

本発明の請求項１に係る管体の接続構造によれば、前記第１開孔部における接続部材の軸心方向一端側の接続部端面を前記接続部材の一端側から他端側へ軸心方向に塑性変形させて第１内周返り部を、前記第２開孔部における接続部材の軸心方向他端側の接続部端面を前記接続部材の他端側から一端側へ軸心方向に塑性変形させて第２内周返り部を同時に形成し、これら接続部材内部に形成された前記接続部の第１内周返り部と第２内周返り部とによって、前記第１周状突出部と第２周状突出部とを両側から挟み込んで接合し、前記第１の管体と第２の管体とが接続されてなるので、先ず前記従来技術１に対しては、ねじ込みやオイル塗布の作業が不要となり、ねじ精度や表面処理の摩擦等の影響を回避できる。また、第１の管体と第２の管体の軸心ずれについても、設備面で対策が取り易い。 According to the pipe connecting structure according to claim 1 of the present invention, the connecting portion end surface of the connecting member at one end in the axial direction of the connecting member in the first opening is axially centered from one end to the other end of the connecting member. The first inner periphery return portion is plastically deformed in the direction, and the connection portion end surface on the other end side in the axial direction of the connection member in the second opening portion is axially extended from the other end side to the one end side of the connection member. The first inner protrusion is formed by the first inner periphery return part and the second inner periphery return part of the connection part formed inside the connection member by simultaneously forming the second inner periphery return part by plastic deformation. And the second circumferential protrusion are sandwiched and joined from both sides, and the first tube body and the second tube body are connected to each other. This eliminates the need for the above work and avoids the effects of screw accuracy and surface treatment friction. In addition, it is easy to take measures in terms of equipment for the axial misalignment between the first tubular body and the second tubular body.

前記従来技術２に対しては、第１の管体と第２の管体は、コーティング加工品を使用可能なため、耐食性を維持できる。また、従来技術２に係る接合部のろう付は、加工時間が１時間程度と非常に長くなるが、本発明に係る第１接合面と第２接合面の接合は、内周返り部の形成に数秒要するのみである。 In contrast to the prior art 2, the first tube body and the second tube body can maintain the corrosion resistance because they can use coated products. In addition, the brazing of the joint according to the prior art 2 takes a very long processing time of about 1 hour. However, the joining of the first joint surface and the second joint surface according to the present invention is the formation of the inner periphery turning portion. It only takes a few seconds.

前記従来技術３に対しては、本発明に係る第２の管体の管端部は、鍛造や切削等により加工することができるため内外径を精度良く加工可能な上、単品で電気めっきを施すことにより耐食性を維持できる。また、この第２の管体の外周にはＴＤＷ（二重巻配管）の様な巻面段差が存在しないため、オイル漏れに対して優位性がある。さらに、ＴＤＷを縮径することによる巻面段差部における鋼板の剥れといった不具合の恐れがない。従来技術４に対しては、本発明に係る管体の接続構造はねじ部が存在しないため、ねじ込み作業が不要な上、ねじ部が管体の軸心から離れた部位にあるため他部品と干渉するといった不具合が生じないので、配管施工の点から有利である。 In contrast to the prior art 3, the tube end portion of the second tubular body according to the present invention can be machined by forging, cutting or the like, so that the inner and outer diameters can be machined with high accuracy and electroplating can be performed separately. Corrosion resistance can be maintained by applying. Further, since there is no winding surface step like TDW (double winding pipe) on the outer periphery of the second tubular body, there is an advantage over oil leakage. Furthermore, there is no fear of a problem such as peeling of the steel sheet at the stepped portion on the winding surface due to the diameter reduction of the TDW. For the prior art 4, since the threaded portion does not exist in the tube connecting structure according to the present invention, the screwing operation is unnecessary and the threaded portion is located away from the axial center of the tube. Since there is no problem of interference, this is advantageous from the point of pipe construction.

また、本発明の請求項２に係る管体の接続構造によれば、前記第１周状突出部が、前記第１接合面を有して前記第１の管体から独立した環状シール部材を形成されてなるので、前記第１の管体に第１周状突出部を形成不可能または形成し難い場合でも、本発明の管体の接続構造が適用可能となる。 Moreover, according to the pipe connection structure according to claim 2 of the present invention, the first circumferential protrusion includes the annular sealing member that has the first joint surface and is independent of the first pipe. Since it is formed, the connection structure of the tubular body of the present invention can be applied even when the first circumferential protrusion cannot be formed or is difficult to form on the first tubular body.

また更に、本発明の請求項３に係る管体の接続構造によれば、前記第１周状突出部がフレアを形成されてなるので、接合時における前記第１接合面の塑性変形による第２接合面への追従性が向上して、接合面のシール性の信頼度がより向上する。 Still further, according to the pipe connection structure according to claim 3 of the present invention, since the first circumferential protrusion is formed with a flare, the second due to plastic deformation of the first joint surface during joining is provided. The followability to the joint surface is improved, and the reliability of the seal performance of the joint surface is further improved.

本発明の請求項４に係る管体の接続構造によれば、前記第１接合面及び第２接合面の間にシールリングが介在されてなるので、接合面におけるシール性の信頼度が更に向上する。 According to the pipe connecting structure according to claim 4 of the present invention, since the seal ring is interposed between the first joint surface and the second joint surface, the reliability of the sealing performance at the joint surface is further improved. To do.

そして、本発明の請求項５に係る管体の接続構造によれば、請求項１乃至４の何れか一つの項に記載の管体の接続構造において、前記第１の管体、第２の管体及び接続部材が、接合される前にめっきまたは／及びコーティングからなる表面処理を施されてなるので、耐食性の高い管体の接続構造が得られる。 And according to the pipe connection structure according to claim 5 of the present invention, in the pipe connection structure according to any one of claims 1 to 4 , the first pipe, the second pipe Since the pipe body and the connection member are subjected to surface treatment made of plating or / and coating before being joined, a pipe connection structure with high corrosion resistance can be obtained.

一方、本発明の請求項６に係るホース継手金具によれば、前記管体の何れか一方が金属管、他方がホース継手用金具のニップルであって、前記接続部材にこのニップルと同心状のホース加締部を形成された、請求項１乃至５の何れか一つの項に記載の管体の接続構造を有してなるので、上記請求項１乃至５の該当する一つの項に記載の管体の接続構造に記載の効果を有するホース継手金具が得られる。
On the other hand, according to the hose fitting according to claim 6 of the present invention, either one of the pipes is a metal tube and the other is a nipple of a hose fitting, and the connecting member is concentric with the nipple. Since it has the connection structure of the pipe body as described in any one of Claims 1 thru | or 5 in which the hose caulking part was formed, the said 1st thru | or 5 corresponding to the said claim A hose joint fitting having the effects described in the connection structure of the tubular body is obtained.

本発明の実施の形態１に係る管体の接続構造を採用したホース継手金具において、部品組立工程を説明するための説明図である。It is explanatory drawing for demonstrating a component assembly process in the hose coupling metal fitting which employ | adopted the connection structure of the tubular body which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る管体の接続構造を採用したホース継手金具において、管体接合工程を説明するための説明図であって、図（ａ）は管体接合前、図（ｂ）は管体接合後、図（ｃ）はホース接続後の各状態を示す。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram for explaining a pipe joining process in a hose joint fitting employing a pipe connecting structure according to Embodiment 1 of the present invention, and FIG. ) Shows the respective states after joining the tube, and FIG. 本発明の実施の形態１における他の態様例Ａに係り、図２（ｃ）における管体接合部分を拡大して示す部分拡大断面図であって、接合面が平面の場合を示す。It is a partial expanded sectional view which expands and shows the pipe joint part in FIG.2 (c) regarding the other example A of Embodiment 1 of this invention, Comprising: The case where a joint surface is a plane is shown. 本発明の実施の形態１における他の態様例Ｂに係り、図２（ｃ）における管体接合部分を拡大して示す部分拡大断面図であって、ＩＳＯフレア接合の場合を示す。It is a partial expanded sectional view which expands and shows the pipe joint part in FIG.2 (c) regarding the other example B of Embodiment 1 of this invention, Comprising: The case of ISO flare joining is shown. 本発明の実施の形態１における他の態様例Ｃに係り、図２（ｃ）における管体接合部分を拡大して示す部分拡大図であって、シールリングとしてシートパッキンを用いた場合を示す。It is the elements on larger scale which show the other example C of Embodiment 1 of this invention, and expand and show the pipe joint part in FIG.2 (c), Comprising: The case where a sheet packing is used as a seal ring is shown. 本発明の実施の形態１における他の態様例Ｄに係り、図２（ｃ）における管体接合部分を拡大して示す部分拡大図であって、シールリングとしてＯリングを用いた場合を示す。It is the elements on larger scale which show the other example D in Embodiment 1 of this invention, and expand and show the pipe joint part in FIG.2 (c), Comprising: The case where an O-ring is used as a seal ring is shown. 本発明の実施の形態２に係り、図２（ｃ）における管体接合部分を拡大して示す部分拡大図であって、第１周状突出部が第１の管体から独立して第１接合面を有した環状シール部材としてオリーブを形成されてなる場合を示す。FIG. 6 is a partially enlarged view showing the tube joint portion in FIG. 2C according to the second embodiment of the present invention, wherein the first circumferential protrusion is the first independent of the first tube. The case where olive is formed as an annular seal member having a joint surface is shown. 従来技術１に係る継手金具の部分断面図である。It is a fragmentary sectional view of the fitting metal fitting concerning prior art 1. 従来技術２に係り、金属チューブを可撓性ホースに結合するために使用する、ろう付された結合部の断面図である。FIG. 4 is a cross-sectional view of a brazed joint portion used to join a metal tube to a flexible hose according to Prior Art 2; 従来技術３に係るブレーキパイプ及び口金具の全体を示す部分断面正面図である。It is a fragmentary sectional front view which shows the brake pipe and the whole fitting which concern on the prior art 3. FIG. 従来技術４に係り、図（ａ）は管体の接続構造の一実施例を示す正断面図、図（ｂ）は図（ａ）のクランプ部材を示す側断面図である。FIG. 4A is a front sectional view showing an embodiment of a tube connecting structure, and FIG. 2B is a side sectional view showing a clamp member of FIG.

本発明の実施の形態１に係る管体の接続構造について、ホース継手金具に採用した態様を例として、理解を容易にするため、先ず添付図１，２を参照しながらその製作手順に沿って説明する。
図１は本発明の実施の形態１に係る管体の接続構造を採用したホース継手金具において、部品組立工程を説明するための説明図、図２は本発明の実施の形態１に係る管体の接続構造を採用したホース継手金具において、管体接合工程を説明するための説明図であって、図（ａ）は管体接合前、図（ｂ）は管体接合後、図（ｃ）はホース接続後の各状態を示す。 The tube connection structure according to the first embodiment of the present invention will be described with reference to the attached FIGS. explain.
FIG. 1 is an explanatory diagram for explaining a part assembling process in a hose coupling fitting adopting a pipe connection structure according to Embodiment 1 of the present invention, and FIG. 2 is a pipe body according to Embodiment 1 of the present invention. In the hose joint fitting adopting the connection structure of FIG. 1, FIG. (A) is an explanatory view for explaining a pipe joining process, FIG. (A) is before pipe joining, FIG. (B) is after pipe joining, FIG. Indicates each state after hose connection.

本発明の実施の形態１に係る管体の接合構造は、略筒形状を有する接続部材３内に、所定長（数１００ｍｍ程度）を有するパイプ（第１の管体）１の一端側とニップル（第２の管体）２の一端側が当接して接合され、本発明の実施の形態１に係るホース継手金具１０として製作される態様を例とする。ここで、略筒形状とは、円形状、多角形状或いは台形状等任意の外形断面形状と、この断面と直交する方向に円形断面の空洞部を有する筒形の形状である。 The tubular body joining structure according to Embodiment 1 of the present invention includes a pipe (first tubular body) 1 having a predetermined length (about several hundred mm) and a nipple in a connecting member 3 having a substantially cylindrical shape. (Second tubular body) An example in which one end side of 2 is abutted and joined and manufactured as a hose fitting 10 according to Embodiment 1 of the present invention is taken as an example. Here, the substantially cylindrical shape is a cylindrical shape having an arbitrary outer cross-sectional shape such as a circular shape, a polygonal shape, or a trapezoidal shape, and a hollow portion having a circular cross section in a direction orthogonal to the cross section.

前記パイプ１の材料としては、ＴＤＷ（ＪＡＳＯＭ１０１：二重巻鋼管）、ＴＳＷ（ＪＡＳＯＭ１０１：一重巻鋼管）、ＳＴＫＭ（機械構造用炭素鋼鋼管）或いはＳＴＡＭ（自動車用電縫管）等が、ニップル２用の材料としては、クロムモリブテン鋼（ＳＣＭ４１５〜ＳＣＭ４４０）、冷間鍛造用炭素鋼（ＳＷＣＨ１２〜ＳＷＣＨ２０）、機械構造用炭素鋼（Ｓ１０Ｃ〜Ｓ４５Ｃ）或いはＳＴＫＭ等を用いることができる。また、接続部材３の材料としては、機械構造用炭素鋼（Ｓ１０Ｃ〜Ｓ４５Ｃ）や冷間鍛造用炭素鋼鋼材（ＳＷＣＨ１２〜ＳＷＣＨ２０）等を用いることができる。 Examples of the material of the pipe 1 include TDW (JASO M101: double wound steel pipe), TSW (JASO M101: single wound steel pipe), STKM (carbon steel pipe for mechanical structure), STAM (electric sewing pipe for automobile), and the like. As the material for the nipple 2, chrome molybdenum steel (SCM415 to SCM440), carbon steel for cold forging (SWCH12 to SWCH20), carbon steel for machine structure (S10C to S45C), STKM, or the like can be used. Moreover, as a material of the connection member 3, carbon steel for machine structure (S10C-S45C), carbon steel material for cold forging (SWCH12-SWCH20), etc. can be used.

パイプ１の一端側にはダブルフレア（第１周状突出部）４が形成されると共に、このダブルフレア４には、先端に向かって凹状のテーパを有する第１接合面４ａが設けられている。一方、ニップル２の一端側にはニップル接合部（第２周状突出部）５が形成され、このニップル接合部５には、先端に向かって凸状のテーパを有する第２接合面５ａが設けられている。 A double flare (first circumferential protrusion) 4 is formed on one end side of the pipe 1, and the double flare 4 is provided with a first joint surface 4 a having a concave taper toward the tip. . On the other hand, a nipple joint portion (second circumferential protrusion) 5 is formed on one end side of the nipple 2, and the nipple joint portion 5 is provided with a second joint surface 5 a having a convex taper toward the tip. It has been.

そして、前記第１接合面４ａのテーパ角と第２接合面５ａのテーパ角とは、傾斜角度が逆向きであって若干異なる角度を有している。即ち、前記第１接合面４ａが９０度，第２接合面５ａが８４度のテーパ角度で接合する様に形成されている。この理由は、第２接合面５ａにおける凸状のテーパ先端部が、第１接合面４ａにおける凹状のテーパ面に食い込み易くするためである。 The taper angle of the first joint surface 4a and the taper angle of the second joint surface 5a are opposite to each other and have slightly different angles. That is, the first joint surface 4a is formed to be joined at a taper angle of 90 degrees and the second joint surface 5a at a taper angle of 84 degrees. The reason for this is to make it easier for the convex tapered tip of the second joint surface 5a to bite into the concave tapered surface of the first joint surface 4a.

また、前記接続部材３の一端側には、接続部３ａが設けられると共に、この接続部３ａにおいて接続部材３の一端側から他端側に順に、パイプ外径ｄ１が挿通可能な第１開孔部径ｄ４を有する第１開孔部６と、パイプ１に形成されたダブルフレア外径ｄ２及びニップル２の一端側に形成されたニップル接合部外径ｄ３を挿通可能な第２開孔部径ｄ５を有する第２開孔部７とが同心状に形成されている。図１では、第１開孔部径ｄ４と第２開孔部径ｄ５とが同一孔径である場合を示しているが、これらの孔径ｄ４及びｄ５は、パイプ１に形成されたダブルフレア外径ｄ２及びニップル２に形成されたニップル接合部外径ｄ３が夫々挿通可能な異なる孔径ｄ４≠ｄ５としても良い。 A connecting portion 3a is provided on one end side of the connecting member 3, and a first opening through which the pipe outer diameter d1 can be inserted in order from the one end side to the other end side of the connecting member 3 in the connecting portion 3a. The diameter of the second opening portion through which the first opening portion 6 having the portion diameter d4 and the double flare outer diameter d2 formed on the pipe 1 and the nipple joint outer diameter d3 formed on one end side of the nipple 2 can be inserted. The second opening 7 having d5 is formed concentrically. FIG. 1 shows a case where the first hole diameter d4 and the second hole diameter d5 are the same hole diameter. These hole diameters d4 and d5 are the double flare outer diameters formed in the pipe 1. Different hole diameters d4 ≠ d5 into which d2 and the nipple joint outer diameter d3 formed on the nipple 2 can be inserted may be used.

そして、図１に示す如く、接続部材３の接続部３ａに設けられた第１開孔部６にパイプ１を他端側から挿通し、図２（ａ）に示す様に、ダブルフレア４が接続部３ａの軸心方向略中間部に位置するよう保持する一方、接続部材３の第２開孔部７に、ニップル２の一端側に形成されたニップル接合部５を挿通して押込むと、パイプ１の第１接合面４ａにニップル２の第２接合面５ａが当接される。 Then, as shown in FIG. 1, the pipe 1 is inserted from the other end side into the first opening 6 provided in the connecting portion 3a of the connecting member 3, and the double flare 4 is formed as shown in FIG. While holding the connection portion 3a so as to be positioned at a substantially intermediate portion in the axial direction, when the nipple joint portion 5 formed on one end side of the nipple 2 is inserted into the second opening portion 7 of the connection member 3 and pushed in. The second joint surface 5a of the nipple 2 is brought into contact with the first joint surface 4a of the pipe 1.

ここで、パイプ１とニップル２の挿入順序、挿入方向は特に限定するものではなく、適宜選択出来る。例えば、接続部３ａに設けられた第１開孔部６に接続材３の一端側から前記パイプ１を挿通して、パイプ１の一端側に形成されたダブルフレア４を接続部３ａの軸心方向略中間部に位置するよう保持する一方、接続部材３の第２開孔部７に、ニップル２の一端側に形成されたニップル接合部５を挿通して押込んで、パイプ１の第１接合面４ａにニップル２の第２接合面５ａを当接しても良い。 Here, the insertion order and insertion direction of the pipe 1 and the nipple 2 are not particularly limited and can be selected as appropriate. For example, the pipe 1 is inserted from one end side of the connecting material 3 into the first opening 6 provided in the connecting portion 3a, and the double flare 4 formed on one end side of the pipe 1 is connected to the axial center of the connecting portion 3a. While holding so as to be positioned at an approximately middle portion in the direction, the nipple joint portion 5 formed on one end side of the nipple 2 is inserted into the second opening portion 7 of the connection member 3 and pushed into the first joint of the pipe 1. The second joining surface 5a of the nipple 2 may be brought into contact with the surface 4a.

次いで、第１開孔部６における接続部材３の軸心方向一端側の端面の、内周に沿う肉厚ｔ１、即ち、加締工具による接続部財３の一端側からの加締径、加締量を図２（ｂ）に示す如く夫々Ｄ１，Ｈ１とすれば、（Ｄ１−ｄ４）／２＝ｔ１を、図２（ａ）の右向矢印の如く接続部材３の一端側から他端側へ軸心方向に加締め（塑性変形させ）る。それと同時に、第２開孔部７における接続部材３の軸心方向他端側の端面の、内周に沿う肉厚ｔ２、即ち、加締工具による接続部材３の他端側からの加締径、加締量を図２（ｂ）に示す如く夫々Ｄ２，Ｈ２とすれば、（Ｄ２−ｄ５）／２＝ｔ２を、図２（ａ）の左向矢印の如く接続部材３の他端側から一端側へ軸心方向に加締め（塑性変形させ）て、図２（ｂ）に示す如く夫々第１内周返り部６ｂ及び第２内周返り部７ａを形成する。 Next, the wall thickness t1 along the inner periphery of the end surface of the first opening 6 on the one end side in the axial direction of the connecting member 3, that is, the caulking diameter from the one end side of the connecting member 3 by the caulking tool, If the tightening amounts are D1 and H1, respectively, as shown in FIG. 2B, (D1−d4) / 2 = t1 is obtained from one end side of the connecting member 3 to the other end as indicated by the right-pointing arrow in FIG. Clamp to the side in the axial direction (plastically deform). At the same time, the wall thickness t2 along the inner periphery of the end surface of the second opening 7 on the other end side in the axial direction of the connecting member 3, that is, the caulking diameter from the other end side of the connecting member 3 by the caulking tool. If the crimping amounts are D2 and H2, respectively, as shown in FIG. 2 (b), (D2-d5) / 2 = t2 becomes the other end side of the connecting member 3 as shown by the left arrow in FIG. 2 (a). The first inner periphery return portion 6b and the second inner periphery return portion 7a are formed as shown in FIG. 2B by caulking (plastically deforming) from one end to the other end in the axial direction.

その結果、接続部材３内部に形成された接続部３ａの第１内周返り部６ｂと第２内周返り部７ａとによって、第１接合面４ａと第２接合面５ａとを当接して、ダブルフレア４の背面４ｂとニップル接合部５の背面５ｂとを両側から挟み込んで接合し、接続部材３内部においてパイプ１とニップル２とが接続されて、本発明の実施の形態１に係るホース継手金具１０が得られる。 As a result, the first joint surface 4a and the second joint surface 5a are brought into contact with each other by the first inner periphery return portion 6b and the second inner periphery return portion 7a of the connection portion 3a formed inside the connection member 3, The back surface 4b of the double flare 4 and the back surface 5b of the nipple joint part 5 are sandwiched and joined from both sides, and the pipe 1 and the nipple 2 are connected inside the connecting member 3, so that the hose joint according to Embodiment 1 of the present invention is connected. The metal fitting 10 is obtained.

そして、図２（ｃ）に示す如く、このホース継手金具１０のニップル２にホース１１を差し込んで、接続部材３の加締部３ｂを外周数箇所から矢印で示す様に求心方向に加締めて、ホース継手金具１０とホース１１とが接続される。 Then, as shown in FIG. 2 (c), the hose 11 is inserted into the nipple 2 of the hose joint fitting 10, and the crimping portion 3b of the connection member 3 is crimped in the centripetal direction as indicated by the arrows from several places on the outer periphery. The hose fitting 10 and the hose 11 are connected.

以上の様な管体の接続構造によって、本発明の実施の形態１に係るホース継手金具１０によれば、ねじ込みやオイル塗布の作業が不要となり、ねじ精度や表面処理の摩擦等の影響を回避できる。また、パイプ１とニップル２の軸心ずれについても、加締装置等の設備面で対策が取り易い。 With the tube connection structure as described above, the hose fitting 10 according to the first embodiment of the present invention eliminates the need for screwing or oil application, and avoids the effects of screw accuracy and surface treatment friction. it can. Moreover, it is easy to take measures against the axial misalignment between the pipe 1 and the nipple 2 in terms of equipment such as a caulking device.

また、パイプ１やニップル２、接続部材３は、めっき処理品やコーティング加工品を使用可能なため、耐食性を維持できる。例えば、本発明の実施の形態１に係るパイプ１は、亜鉛めっき、錫亜鉛合金めっき、亜鉛−ニッケル合金めっき或いは亜鉛−鉄合金めっき等の電気めっきを施した上に、ポリアミド樹脂やふっ素樹脂等をコーティング可能であり、ニップル２及び接続部材３については、加締以外の事前の部品加工をした後、亜鉛めっき、錫亜鉛合金めっき、亜鉛−ニッケル合金めっき或いは亜鉛−鉄合金めっき等の電気めっきを施すことができる。また、接合部をろう付する場合は、加工時間が１時間程度と非常に長くなるが、本発明の実施の形態１に係る第１接合面４ａと第２接合面５ａの接合は、加締加工による第１及び第２内周返り部６ｂ，７ａの形成に数秒要するのみである。 Moreover, since the pipe 1, the nipple 2, and the connection member 3 can use a plating processing product and a coating processed product, corrosion resistance can be maintained. For example, the pipe 1 according to Embodiment 1 of the present invention is subjected to electroplating such as zinc plating, tin-zinc alloy plating, zinc-nickel alloy plating, or zinc-iron alloy plating, and then a polyamide resin, a fluorine resin, or the like. The nipple 2 and the connecting member 3 can be electroplated, such as zinc plating, tin-zinc alloy plating, zinc-nickel alloy plating, or zinc-iron alloy plating, after processing parts in advance other than caulking. Can be applied. Further, when brazing the joint portion, the processing time is as long as about 1 hour, but the joining of the first joint surface 4a and the second joint surface 5a according to Embodiment 1 of the present invention is caulking. It only takes a few seconds to form the first and second inner periphery turning portions 6b and 7a by processing.

更に、本発明の実施の形態１に係るニップル２は、鍛造や切削等により加工することができるため内外径を精度良く加工可能な上、単品で電気めっきを施すことにより耐食性を維持できる。また、このニップル２の外周にはＴＤＷ（二重巻配管）の様な巻面段差が存在しないため、オイル漏れに対して優位性がある。更に、ＴＤＷを縮径することによる巻面段差部における鋼板の剥れといった不具合の恐れがない。また、本発明に係るパイプ１とニップル２の接続構造はねじ部が存在しないため、ねじ込み作業が不要な上、ねじ部が管体の軸心から離れた部位にあるため他部品と干渉するといった不具合が生じないので、配管施工の点から有利である。 Furthermore, since the nipple 2 according to Embodiment 1 of the present invention can be processed by forging, cutting, or the like, the inner and outer diameters can be processed with high accuracy, and the corrosion resistance can be maintained by performing electroplating as a single product. Further, since there is no winding surface step like TDW (double winding pipe) on the outer periphery of the nipple 2, there is an advantage over oil leakage. Furthermore, there is no fear of a problem such as peeling of the steel sheet at the stepped portion on the winding surface due to the diameter reduction of the TDW. Further, since the connection structure between the pipe 1 and the nipple 2 according to the present invention does not have a threaded portion, a screwing operation is not necessary, and the threaded portion is located away from the axial center of the tube body and interferes with other parts. Since no trouble occurs, it is advantageous in terms of piping construction.

尚、図１，２を参照して説明した上記実施の形態１においては、パイプ１の第１周状突出部４がダブルフレアを形成され、第１接合面４ａ及びニップル２の第２接合面５ａの何れもがテーパ面を形成されたもので説明したが、本発明の実施の形態１に係る管体の接続構造及びこれを用いたホース継手金具のパイプ１の第１周状突出部４は、フレアではなく、図３に示す如く接合面がニップル接合部５と略同形状の、テーパ面を有していない平面のリング状接合部１４でも良い。図３は本発明の実施の形態１における他の態様例Ａに係り、図２（ｃ）における管体接合部分を拡大して示す部分拡大断面図であって、接合面が平面の場合を示す。 In the first embodiment described with reference to FIGS. 1 and 2, the first circumferential protrusion 4 of the pipe 1 is formed with a double flare, and the first joint surface 4 a and the second joint surface of the nipple 2. 5a has been described as having a tapered surface. However, the tubular body connection structure according to the first embodiment of the present invention and the first circumferential protrusion 4 of the pipe 1 of the hose fitting using the same are described. Instead of a flare, a flat ring-shaped joint portion 14 having a tapered surface having substantially the same shape as the nipple joint portion 5 as shown in FIG. 3 may be used. FIG. 3 relates to another example A of the first embodiment of the present invention, and is a partially enlarged cross-sectional view showing a tube joint portion in FIG. .

即ち、この図３に示す他の態様例Ａでは、パイプ１のリング状接合部１４（第１周状突出部４）は、軸心方向に直交するリング状の第１接合面１４ａと背面１４ｂが形成されると共に、ニップル接合部５も同様に、軸心方向に直交するリング状の第２接合面５ａと背面５ｂが形成されている。そして、前記パイプ１の第１接合面１４ａにニップル２の第２接合面５ａが当接され、接続部材３に形成された接続部３ａの第１内周返り部６ｂと第２内周返り部７ａとによって、第１接合面１４ａと第２接合面５ａとを当接して、リング状接合部1４の背面1４ｂとニップル接合部５の背面５ｂとを両側から挟み込んで接合し、接続部材３内部においてパイプ１とニップル２とが接続されている。 That is, in another embodiment A shown in FIG. 3, the ring-shaped joint portion 14 (first circumferential protrusion 4) of the pipe 1 has a ring-shaped first joint surface 14a and a back surface 14b orthogonal to the axial direction. Similarly, the nipple joint portion 5 is also formed with a ring-shaped second joint surface 5a and a back surface 5b perpendicular to the axial direction. Then, the first joint surface 14 a of the pipe 1 is brought into contact with the second joint surface 5 a of the nipple 2, and the first inner periphery return portion 6 b and the second inner periphery return portion of the connection portion 3 a formed on the connection member 3. 7a, the first joint surface 14a and the second joint surface 5a are brought into contact with each other, and the back surface 14b of the ring-shaped joint portion 14 and the back surface 5b of the nipple joint portion 5 are sandwiched and joined from both sides, and the inside of the connecting member 3 In FIG. 1, the pipe 1 and the nipple 2 are connected.

また、本発明の実施の形態１に係る管体の接続構造及びこれを用いたホース継手金具は、図示は省略するが第１接合面４ａ及び第２接合面５ａの何れか一方のみがテーパ面であっても良い。本発明の実施の形態１に係る管体の接続構造またはこれを用いたホース継手金具によれば、第１接合面４ａ及び第２接合面５ａの少なくとも一方にテーパ面を形成することによって、軸心方向の加締力が接合面４ａ，５ａに垂直方向の密着力として分配されるためシール性が良好になる。 In addition, the pipe connection structure and the hose joint fitting using the same according to Embodiment 1 of the present invention are not shown, but only one of the first joint surface 4a and the second joint surface 5a is a tapered surface. It may be. According to the tubular body connection structure or the hose joint fitting using the same according to Embodiment 1 of the present invention, the shaft is formed by forming a tapered surface on at least one of the first joint surface 4a and the second joint surface 5a. Since the caulking force in the center direction is distributed as the adhesion force perpendicular to the joint surfaces 4a and 5a, the sealing performance is improved.

また、本発明の実施の形態１に係る管体の接続構造及びこれを用いたホース継手金具は、第１周状突出部４がシングルフレアを形成されていても良い。本発明の実施の形態１に係る管体の接続構造及びこれを用いたホース継手金具によれば、第１周状突出部４がシングルフレアまたはダブルフレアを形成されているので、接合時における前記第１接合面４ａの、塑性変形によるニップル２側の第２接合面５ａへの追従性が向上して、両接合面４ａ，５ａのシール性の信頼度がより向上する。 Moreover, as for the connection structure of the tubular body concerning Embodiment 1 of this invention, and the hose coupling metal fitting using this, the 1st circumferential protrusion 4 may form the single flare. According to the pipe connection structure and the hose fitting using the same according to the first embodiment of the present invention, the first circumferential protrusion 4 is formed with a single flare or a double flare. The followability of the first joint surface 4a to the second joint surface 5a on the nipple 2 side due to plastic deformation is improved, and the reliability of the sealing performance of both the joint surfaces 4a and 5a is further improved.

図４は、本発明の実施の形態１における他の態様例Ｂに係り、図２（ｃ）における管体接合部分を拡大して示す部分拡大断面図であって、ＩＳＯフレア接合の場合を示す。 FIG. 4 is a partial enlarged cross-sectional view showing a tube joint portion in FIG. 2 (c) in an enlarged manner according to another example B in the first embodiment of the present invention, and shows a case of ISO flare joining. .

即ち、この図４に示す他の態様例Ｂでは、パイプ１のＩＳＯフレア１５（第１周状突出部４）は、軸心方向にテーパを有するリング状の第１接合面１５ａと軸心方向に略直交する背面１５ｂが形成されると共に、ニップル接合部５も同様に、軸心方向逆向きに若干異なる角度のテーパを有する、リング状の第２接合面５ａと軸心方向に略直交する背面５ｂが形成されている。 That is, in another example B shown in FIG. 4, the ISO flare 15 (first circumferential protrusion 4) of the pipe 1 has a ring-shaped first joint surface 15 a tapered in the axial direction and the axial direction. And the nipple joint portion 5 is also substantially perpendicular to the axial direction of the ring-shaped second joint surface 5a having a taper with a slightly different angle in the opposite axial direction. A back surface 5b is formed.

そして、前記パイプ１の第１接合面１５ａにニップル２の第２接合面５ａが当接され、接続部材３に形成された接続部３ａの第１内周返り部６ｂと第２内周返り部７ａとによって、第１接合面１５ａと第２接合面５ａとを当接して、ＩＳＯフレア１５の背面1５ｂとニップル接合部５の背面５ｂとを両側から挟み込んで接合し、接続部材３内部においてパイプ１とニップル２とが接続されている。尚、フレアには、ダブルフレア、シングルフレア及びＩＳＯフレアが含まれるが、シール性の安定性の観点より、ダブルフレアまたはＩＳＯフレアを選択することが望ましい。 Then, the first joint surface 15a of the pipe 1 is brought into contact with the second joint surface 5a of the nipple 2, and the first inner periphery return portion 6b and the second inner periphery return portion of the connection portion 3a formed on the connection member 3 are formed. 7a, the first joint surface 15a and the second joint surface 5a are brought into contact with each other, and the back surface 15b of the ISO flare 15 and the back surface 5b of the nipple joint portion 5 are sandwiched and joined from both sides, and a pipe is formed inside the connection member 3. 1 and the nipple 2 are connected. The flare includes a double flare, a single flare, and an ISO flare. From the viewpoint of stability of sealing performance, it is desirable to select a double flare or an ISO flare.

更に、図１，２を参照して説明した上記実施の形態１においては、パイプ１の第１接合面４ａ及びニップル２の第２接合面５ａが直接接触して接合面が形成されていたが、本発明の実施の形態１に係る管体の接続構造及びこれを用いたホース継手金具１０は、第１接合面４ａ及び第２接合面５ａの間にシールリングが介装されても良い。本発明の実施の形態１に係る管体の接続構造及びこれを用いたホース継手金具１０において、シールリングを用いた態様例を以下添付図５，６を参照しながら説明する。 Furthermore, in the first embodiment described with reference to FIGS. 1 and 2, the first joint surface 4a of the pipe 1 and the second joint surface 5a of the nipple 2 are in direct contact with each other to form a joint surface. In the tubular body connection structure and the hose joint fitting 10 using the same according to Embodiment 1 of the present invention, a seal ring may be interposed between the first joint surface 4a and the second joint surface 5a. An exemplary embodiment using a seal ring in the pipe connection structure and the hose joint fitting 10 using the same according to the first embodiment of the present invention will be described below with reference to FIGS.

図５，６は本発明の実施の形態１における他の態様例Ｃ，Ｄに係り、図２（ｃ）における管体接合部分を拡大して示す部分拡大図であって、図５はシールリングとしてシートパッキンを用いた場合、図６はシールリングとしてＯリングを用いた場合を夫々示す。 5 and 6 relate to other modes C and D according to the first embodiment of the present invention, and are partially enlarged views showing the tube joint portion in FIG. 2 (c) in an enlarged manner, and FIG. 5 is a seal ring. FIG. 6 shows a case where an O-ring is used as a seal ring.

図５に示す他の態様例Ｃは、シートパッキン２０が接合部に介装された例である。即ち、この図５に示す態様例は、図３を用いて説明したパイプ１のリング状接合部１４（第１周状突出部４）とニップル接合部５との間に、シートパッキン２０が介装された例であり、パイプ１の第１接合面１４ａにニップル２の第２接合面５ａがシートパッキン２０を介して当接され、接続部材３に形成された接続部３ａの第１内周返り部６ｂと第２内周返り部７ａとによって、第１接合面１４ａと第２接合面５ａとを当接して、リング状接合部1４の背面1４ｂとニップル接合部５の背面５ｂとを両側から挟み込んで接合し、接続部材３内部においてパイプ１とニップル２とが接続されている。 Another embodiment C shown in FIG. 5 is an example in which the sheet packing 20 is interposed at the joint. That is, in the embodiment shown in FIG. 5, the sheet packing 20 is interposed between the ring-shaped joint 14 (first circumferential protrusion 4) and the nipple joint 5 of the pipe 1 described with reference to FIG. The first inner periphery of the connecting portion 3a formed on the connecting member 3 is the example in which the second connecting surface 5a of the nipple 2 is brought into contact with the first connecting surface 14a of the pipe 1 via the sheet packing 20. The first joint surface 14a and the second joint surface 5a are brought into contact with each other by the return portion 6b and the second inner peripheral return portion 7a, so that the back surface 14b of the ring-shaped joint portion 14 and the back surface 5b of the nipple joint portion 5 are on both sides. The pipe 1 and the nipple 2 are connected inside the connecting member 3.

図６に示す態様例Ｄは、Ｏリング２１が接合部に介装された例である。即ち、この図６に示す態様例は、パイプ１のＯリングフレア１６（第１周状突出部４）は、フレア前面のテーパ状の第１接合面１６ａと折り返したフレアに背面１６ｂが形成されると共に、ニップル接合部５も同様に、Ｏリングが当接されるテーパを有するリング状の第２接合面５ａと軸心方向に略直交する背面５ｂが形成されている。 A mode example D shown in FIG. 6 is an example in which the O-ring 21 is interposed at the joint. That is, in the embodiment shown in FIG. 6, the O-ring flare 16 (first circumferential protrusion 4) of the pipe 1 has a back surface 16b formed on a flare that is folded back with a tapered first joint surface 16a on the front surface of the flare. Similarly, the nipple joint portion 5 is also formed with a ring-shaped second joint surface 5a having a taper with which the O-ring is brought into contact with and a back surface 5b substantially orthogonal to the axial direction.

そして、前記パイプ１の第１接合面１６ａにＯリング２１を介してニップル２の第２接合面５ａが当接され、接続部材３に形成された接続部３ａの第１内周返り部６ｂと第２内周返り部７ａとによって、第１接合面１６ａと第２接合面５ａとを当接してＯリングフレア１６の背面1６ｂとニップル接合部５の背面５ｂとを両側から挟み込んで接合し、接続部材３内部においてパイプ１とニップル２とが接続されている。 Then, the second joint surface 5a of the nipple 2 is brought into contact with the first joint surface 16a of the pipe 1 via the O-ring 21, and the first inner periphery return portion 6b of the connection portion 3a formed in the connection member 3 is connected. With the second inner periphery returning portion 7a, the first joining surface 16a and the second joining surface 5a are brought into contact, and the back surface 16b of the O-ring flare 16 and the back surface 5b of the nipple joint portion 5 are sandwiched and joined from both sides, The pipe 1 and the nipple 2 are connected inside the connecting member 3.

この様なパイプ１とニップル２の接続構造によれば、第１接合面１４ａ，１６ａ及び第２接合面５ａ，５ａの間に、シートパッキン２０やＯリング２１等のシールリングが介装されてなるので、接合面におけるシール性の信頼度が更に向上する。 According to such a connection structure of the pipe 1 and the nipple 2, a seal ring such as the sheet packing 20 and the O-ring 21 is interposed between the first joint surfaces 14a and 16a and the second joint surfaces 5a and 5a. Therefore, the reliability of the sealing performance at the joint surface is further improved.

本発明の実施の形態１に係る管体の接続構造に関し、ホース継手金具に採用した実施例について、以下前図１，２を参照しながら説明する。
上述した本発明の実施の形態１に係る管体の接続構造及びこれを用いたホース継手金具の製作方法に基づき、下記の通り試作した管体の継手金具に、ホースを加締めて締結したものの耐圧試験を実施した。試作に用いた各部品の条件は、下記の通りである。 With respect to the pipe connection structure according to the first embodiment of the present invention, examples employed in the hose fitting will be described below with reference to FIGS.
Based on the pipe connection structure according to the first embodiment of the present invention described above and the method of manufacturing the hose fitting using the same, the hose is crimped and fastened to the pipe fitting produced as a trial as follows. A pressure test was performed. The conditions of each part used for the trial production are as follows.

（１）パイプ
・形状：図１に示す通り
・材質：ＪＡＳＯＭ１０１ＴＤＷ呼び径４．７６ｍｍ
・寸法：外径ｄ１＝４．７６ｍｍ、肉厚０．７ｍｍ、
・第１周状突出部のシート形状
：ＪＡＳＯＦ４０２ダブルフレア（ＩＤＦ）呼び４．７５
ｄ２＝６．９ｍｍ
・表面処理：電気亜鉛めっき２５μｍ＋有機被膜（ふっ素樹脂コーティング）
１５μｍ (1) Pipe ・ Shape: As shown in FIG. 1 ・ Material: JASO M101 TDW Nominal diameter 4.76 mm
・ Dimensions: outer diameter d1 = 4.76 mm, wall thickness 0.7 mm,
-Sheet shape of the first circumferential protrusion
: JASO F402 Double Flare (IDF) Nominal 4.75
d2 = 6.9 mm
・ Surface treatment: electrogalvanized 25μm + organic coating (fluorine resin coating)
15 μm

（２）ニップル
・形状：図１に示す通り
・材質：Ｓ１５Ｃ
・寸法：第２周状突出部外径ｄ３＝７ｍｍ、管部外径３．５ｍｍ
・第２周状突出部のシート形状：ＪＡＳＯＦ４０２ＡＳ１呼び４．７５
・表面処理：電気亜鉛めっき８μｍ＋有色クロメート（３価クロム仕様）
（３）接続部材
・形状：図１に示す通り
・材質：Ｓ１５Ｃ
・寸法：第１開孔部径ｄ４＝７．２ｍｍ、第２開孔部径ｄ５＝７．２ｍｍ、
加締部内径ｄ６＝１１ｍｍ
・表面処理：電気亜鉛めっき８μｍ＋有色クロメート（３価クロム仕様） (2) Nipple ・ Shape: As shown in FIG. 1 ・ Material: S15C
・ Dimensions: second circumferential protrusion outer diameter d3 = 7 mm, pipe outer diameter 3.5 mm
-Sheet shape of the second circumferential protrusion: JASO F402 AS1 nominal 4.75
・ Surface treatment: Electrogalvanized 8μm + colored chromate (trivalent chromium specification)
(3) Connection member ・ Shape: As shown in FIG. 1 ・ Material: S15C
-Dimensions: 1st opening part diameter d4 = 7.2mm, 2nd opening part diameter d5 = 7.2mm,
Clamping section inner diameter d6 = 11mm
・ Surface treatment: Electrogalvanized 8μm + colored chromate (trivalent chromium specification)

この様に製作した各部品を、図１，２を用いて説明した製作手順に従って、管体の接続を行なった。その際、図２（ｂ）に示した接続部材３における第１開孔部内周近傍の肉厚ｔ１及び第２開孔部内周近傍の肉厚ｔ２を何れも０．６５ｍｍ一定値とする一方、第１内周返り部６ｂを形成する際の加締量Ｈ１及び第２内周返り部７ａを形成する際の加締量Ｈ２を種々変え（表１参照）て加締め、パイプ１とニップル２を接続してホース継手金具１０を試作した。これらのホース継手金具１０の各ニップル２にホース１１を差し込み、接続部材３の加締部３ａを外周から求心方向に加締めてホース１１を接続した。 The parts manufactured in this way were connected to each other according to the manufacturing procedure described with reference to FIGS. At that time, in the connecting member 3 shown in FIG. 2B, the thickness t1 in the vicinity of the inner periphery of the first aperture and the thickness t2 in the vicinity of the inner periphery of the second aperture are both set to a constant value of 0.65 mm, The pipe 1 and the nipple 2 are swaged by variously changing the caulking amount H1 when forming the first inner circumference turning portion 6b and the caulking amount H2 when forming the second inner circumference turning portion 7a (see Table 1). To make a hose joint fitting 10 as a prototype. A hose 11 was inserted into each nipple 2 of these hose fittings 10, and the crimping portion 3 a of the connection member 3 was crimped in the centripetal direction from the outer periphery to connect the hose 11.

次いで、上記ホース継手金具１０試作品の耐圧試験を行なうため各ホース１１を順次耐圧試験装置に接続して、試験流体を注入しつつ加圧し、圧力２９．４ＭＰａにて３０ｓ間保持して漏れの有無を確認した。この耐圧試験の結果を表１にまとめて示す。 Next, in order to perform a pressure resistance test of the hose fitting 10 prototype, each hose 11 is sequentially connected to a pressure testing device, pressurized while injecting a test fluid, and held at a pressure of 29.4 MPa for 30 seconds to prevent leakage. The presence or absence was confirmed. The results of this pressure resistance test are summarized in Table 1.

この結果によれば、本発明の実施の形態１に係る管体の接続構造及びこれを用いたホース継手金具において、耐圧試験に耐え得るシール性を有する管体の接続構造とするには、上記加締量Ｈ１とＨ２の和、即ち（Ｈ１＋Ｈ２）を０．６０ｍｍ以上とするのが好ましく、（Ｈ１＋Ｈ２）を０．８０ｍｍ以上とするのがより好ましいことが分かった。また、第１内周返り部６ｂ及び第２内周返り部７ａを形成する際の加締加工のバランス、更には加工後の前記両返り部６ｂ，７ａの信頼度のバランスから、前記加締量Ｈ１とＨ２を同程度の値とするのが好ましい。 According to this result, in the tube connection structure according to Embodiment 1 of the present invention and the hose fitting using the tube connection structure, the tube connection structure having a sealing property capable of withstanding a pressure resistance test is described above. It was found that the sum of the crimping amounts H1 and H2, that is, (H1 + H2) is preferably 0.60 mm or more, and (H1 + H2) is more preferably 0.80 mm or more. Further, the caulking process balance when forming the first inner circumference return part 6b and the second inner circumference return part 7a, and further the balance of reliability of the both return parts 6b and 7a after processing, It is preferable that the amounts H1 and H2 be approximately the same value.

次に、本発明の実施の形態２に係る管体の接続構造及びこれを用いたホース継手金具を、以下添付図７を参照しながら説明する。図７は本発明の実施の形態２に係り、図２（ｃ）における管体接合部分を拡大して示す部分拡大図であって、第１周状突出部が第１の管体から独立して第１接合面を有した環状シール部材としてオリーブを形成されてなる場合を示す。 Next, a pipe connection structure and a hose fitting using the same according to Embodiment 2 of the present invention will be described below with reference to FIG. FIG. 7 relates to the second embodiment of the present invention, and is a partially enlarged view showing the tube joint portion in FIG. 2 (c) in an enlarged manner, wherein the first circumferential protrusion is independent of the first tube. The case where an olive is formed as an annular seal member having a first joint surface is shown.

但し、本発明の実施の形態２が上記実施の形態１と相違するところは、第１周状突出部の構成と、第１周状突出部及びパイプ（第１の管体）の独立構成有無に相違があり、これらの相違以外は上記実施の形態１と全く同構成であるから、上記実施の形態１と同一のものに同一符号を付して、以下その相違する点について説明する。 However, the second embodiment of the present invention differs from the first embodiment in that the configuration of the first circumferential protrusion and the independent configuration of the first circumferential protrusion and the pipe (first tube) are present. Since these are the same as those of the first embodiment except for these differences, the same components as those of the first embodiment are denoted by the same reference numerals, and the differences will be described below.

即ち、上記実施の形態１に係る管体の接続構造またはこれを用いたホース継手金具においては、第１周状突出部はダブルフレアを構成すると共に、このダブルフレアはパイプ（第１の管体）と一体的に構成されていたのに対し、本発明の実施の形態２に係る管体の接続構造及びこれを用いたホース継手金具では、第１周状突出部が第１接合面を有した環状シール部材を構成すると共に、この第１接合面を有した環状シール部材はパイプから独立して構成されている。 That is, in the tubular body connection structure according to the first embodiment or the hose fitting using the same, the first circumferential protrusion constitutes a double flare, and the double flare is a pipe (first tubular body). In the tube connection structure according to the second embodiment of the present invention and the hose joint fitting using the same, the first circumferential protrusion has the first joint surface. The annular seal member having the first joint surface is configured independently of the pipe.

図７に示す態様例では、第１周状突出部４がパイプ１から独立してオリーブ１８を形成されている。そして、パイプ１の一端側外周１ａとニップル接合部５との間にオリーブ１８が介装され、パイプ１の一端側外周１ａとニップル２の第２接合面５ａがオリーブ１８を介して当接され、接続部材３に形成された接続部３ａの第１内周返り部６ｂと第２内周返り部７ａとによって、第１接合面１８ａと第２接合面５ａとを当接して、オリーブ１８の背面１８ｂとニップル接合部５の背面５ｂとを両側から挟み込んで接合し、接続部材３内部においてパイプ１とニップル２とが接続されている。 In the embodiment shown in FIG. 7, the first circumferential protrusion 4 is formed with an olive 18 independently of the pipe 1. And the olive 18 is interposed between the one end side outer periphery 1a of the pipe 1 and the nipple joint portion 5, and the one end side outer periphery 1a of the pipe 1 and the second joint surface 5a of the nipple 2 are brought into contact with each other via the olive 18. The first joint surface 18a and the second joint surface 5a are brought into contact with each other by the first inner periphery return portion 6b and the second inner periphery return portion 7a of the connection portion 3a formed in the connection member 3, and the olive 18 The back surface 18b and the back surface 5b of the nipple joint 5 are sandwiched and joined from both sides, and the pipe 1 and the nipple 2 are connected inside the connection member 3.

従って、本発明の実施の形態２に係る管体の接続構造またはこれを用いたホース継手金具によれば、第１周状突出部４がパイプ１から独立した環状シール部材としてオリーブ１８を形成されてなるので、前記パイプ１に第１周状突出部４を形成不可能または形成し難い場合でも、パイプ１とニップル２の接続が可能となる。 Therefore, according to the tube connection structure or the hose fitting using the same according to the second embodiment of the present invention, the first circumferential protrusion 4 is formed with the olive 18 as an annular seal member independent of the pipe 1. Therefore, even when the first circumferential protrusion 4 cannot be formed or is difficult to form on the pipe 1, the pipe 1 and the nipple 2 can be connected.

以上説明した通り、本発明に係る管体の接続構造及びこれを用いたホース継手金具によれば、ねじ込みやオイル塗布の作業が不要となり、ねじ精度や表面処理の摩擦等の影響を回避できる。また、管体同士（例えば、パイプとニップル）の軸心ずれについても、加締装置等の設備面で対策が取り易い。更に、管体やソケットは、めっき処理品やコーティング加工品を使用可能なため、耐食性を維持できる上、接合部の加工は、ろう付の場合は加工時間が１時間程度と非常に長くなるが、本発明の場合は加締加工による内周返り部の形成に数秒要するのみである。 As described above, according to the tubular body connection structure and the hose coupling fitting using the same according to the present invention, screwing and oil application operations are not required, and the effects of screw accuracy and surface treatment friction can be avoided. Moreover, it is easy to take measures against the axial misalignment between the pipe bodies (for example, the pipe and the nipple) in terms of equipment such as a caulking device. Furthermore, since the pipe body and socket can be plated or coated products, the corrosion resistance can be maintained, and the processing time of the joint is extremely long, about 1 hour in the case of brazing. In the case of the present invention, it takes only a few seconds to form the inner periphery turning portion by caulking.

ｄ１：パイプ外径，
ｄ２：ダブルフレア（第１周状突出部）外径，
ｄ３：ニップル接合部（第２周状突出部）外径，
ｄ４：第１開孔部径，
ｄ５：第２開孔部径，
ｄ６：加締部内径，
Ｄ１，Ｄ２：加締径，
Ｈ１，Ｈ２：加締量，
ｔ１：第１開孔部内周近傍の肉厚，
ｔ２：第２開孔部内周近傍の肉厚，
１：パイプ（第１の管体），１ａ：一端側外周，
２：ニップル（第２の管体），
３：接続部材，３ａ：接続部，３ｂ：加締部，
４：ダブルフレア（第１周状突出部），４ａ：第１接合面，４ｂ：背面，
５：ニップル接合部（第２周状突出部），５ａ：第２接合面，５ｂ：背面，
６：第１開孔部，６ｂ：第１内周返り部，
７：第２開孔部，７ａ：第２内周返り部，
１０：ホース継手金具，１１：ホース，
１４：リング状接合部（第１周状突出部），１４ａ：第１接合面，１４ｂ：背面，
１５：ＩＳＯフレア（第１周状突出部），１５ａ：第１接合面，１５ｂ：背面，
１６：Ｏリングフレア（第１周状突出部），１６ａ：第１接合面，１６ｂ：背面，
１８：オリーブ（第１周状突出部），１８ａ：第１接合面，１８ｂ：背面，
２０：シートパッキン，２１：Ｏリング d1: pipe outer diameter,
d2: Double flare (first circumferential protrusion) outer diameter,
d3: Nipple joint (second circumferential protrusion) outer diameter,
d4: first aperture diameter,
d5: second aperture diameter,
d6: inner diameter of the crimped portion,
D1, D2: caulking diameter,
H1, H2: Clamping amount,
t1: Thickness near the inner periphery of the first aperture,
t2: thickness near the inner periphery of the second aperture,
1: Pipe (first tube), 1a: One end side outer periphery,
2: Nipple (second tube),
3: connection member, 3a: connection part, 3b: caulking part,
4: Double flare (first circumferential protrusion), 4a: first joint surface, 4b: back surface,
5: Nipple joint (second circumferential protrusion), 5a: second joint surface, 5b: back surface,
6: 1st opening part, 6b: 1st inner periphery return part,
7: 2nd opening part, 7a: 2nd inner periphery return part,
10: Hose fitting, 11: Hose,
14: Ring-shaped joint (first circumferential protrusion), 14a: first joint surface, 14b: back surface,
15: ISO flare (first circumferential protrusion), 15a: first joint surface, 15b: back surface,
16: O-ring flare (first circumferential protrusion), 16a: first joint surface, 16b: back surface,
18: Olive (first circumferential protrusion), 18a: first joint surface, 18b: back surface,
20: Seat packing, 21: O-ring

Claims

In the connection member having a substantially cylindrical shape, a connection structure for a tubular body in which one end side of the first tubular body and one end side of the second tubular body are in contact with each other and joined,
While the first joint surface is provided on the tip end side in the axial direction of the first circumferential protrusion formed on one end side of the first tubular body,
A second joining surface is provided on the tip end side in the axial direction of the second circumferential protrusion formed on one end side of the second tubular body;
The connection member is provided with a connection portion,
The connecting portion includes, in order from the one end side of the connecting member in the axial direction, a first opening portion through which a first circumferential protrusion formed in the first tubular body can be inserted, and the second tube The second opening portion through which the second circumferential protrusion formed in the body can be inserted is concentrically formed with the same or different inner diameter,
The first tubular body is inserted from the other end side into the first opening,
Next, a second circumferential protrusion formed on the second tubular body is inserted into the second opening, and the second tubular body is inserted into the first joint surface of the first tubular body. 2 joint surfaces are abutted,
The first inner periphery return portion is formed by plastically deforming the connecting portion end face on one end side in the axial direction of the connecting member in the first opening portion in the axial direction from one end side to the other end side of the connecting member. Forming the second inner circumferential return portion at the same time by plastically deforming the connecting portion end face on the other end side in the axial direction of the connecting member in the opening portion from the other end side of the connecting member to the one end side in the axial direction;
The first circumferential protrusion and the second circumferential protrusion are sandwiched and joined from both sides by the first inner periphery return portion and the second inner periphery return portion of the connection portion formed inside these connection members. , Ri Na is connected the the first tube and the second tube is,
The first joint surface is formed with a concave tapered surface toward the tip, and the second joint surface is formed with a convex taper surface toward the tip,
The taper angle of the first joint surface and the taper angle of the second joint surface are opposite to each other, and the taper angle of the first joint surface is larger than the taper angle of the second joint surface. Characteristic tube connection structure.

The tube connection according to claim 1, wherein the first circumferential protrusion is formed with an annular seal member having the first joint surface and independent from the first tube. Construction.

The tube connection structure according to claim 1, wherein the first circumferential protrusion is formed with a flare.

The tube connecting structure according to any one of claims 1 to 3 , wherein a seal ring is interposed between the first joint surface and the second joint surface.

The first tubular body, the second tubular member and the connecting member, any one of claims 1 to 4, characterized in plating and / or by comprising surface-treated consisting of a coating prior to being joined The connection structure of the pipe described in one section.

The first tube body is a metal tube, the second tube body is a nipple of a hose joint fitting, and a hose caulking portion concentric with the nipple is formed on the connection member. 5. A metal fitting for hose couplings, comprising the pipe connection structure according to any one of items 5 to 5 .