JP2006200597A

JP2006200597A - Pipe connection structure

Info

Publication number: JP2006200597A
Application number: JP2005011091A
Authority: JP
Inventors: Masayuki Kamikane; 上兼　　正之
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2005-01-19
Filing date: 2005-01-19
Publication date: 2006-08-03
Anticipated expiration: 2025-01-19
Also published as: JP4199735B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe connection structure for improving the sealability of connection portions of two pipes by making two pipes in closer contact with each other. <P>SOLUTION: A first flange 11 of the first pipe 10 has a first bent portion 11a formed by bending the first pipe 10 at one end and a first tapered portion 11b unfolded from the first bent portion 11a to the other end. A second flange 21 of the second pipe 20 has a second bent portion 21a shaped corresponding to the first bent portion 11a and a second tapered portion 21b unfolded from the second bent portion 21a to the first pipe 10. A fastener 30 has a first annular bracket 31 having a tapered face in close contact with the inside of the first tapered portion 11b of the first flange 11 and a second annular bracket 32 having a tapered face in close contact with the outside of the second tapered portion 21b of the second flange 20, which are fastened to each other in the axial direction of the pipes with two flanges 11, 21 being held therebetween. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、二つのパイプを留め具によって連結したパイプの連結構造に関するものである。 The present invention relates to a pipe connection structure in which two pipes are connected by a fastener.

従来、二つのパイプを留め具によって連結したパイプの連結構造として、図５に示すように、一方のパイプ８１の端部に形成したカール部８１１と、他方のパイプ８２の端部に形成したカール部８２１とを、パイプ８１，８２の外周形状に沿った半リング状に形成される二つの留め具８３を締結することによって連結させる構造が知られている（特許文献１参照）。具体的に、この構造では、半リング状の留め具８３の内周面に締結溝８３ａが形成され、この締結溝８３ａを構成する側壁の一部にテーパ面８３ｂが形成されている。そのため、二つの留め具８３を図示せぬボルトなどで締結させると、留め具８３のテーパ面８３ｂによってカール部８１１，８２１がパイプ８１，８２の軸方向に押圧されて密着するようになっている。また、これらのカール部８１１，８２１の密着部分の外側には、シール部材８４が設けられている。このような構造によれば、留め具８３のテーパ面８３ｂでカール部８１１，８２１が押されて密着することである程度のシール性が確保されるとともに、カール部８１１，８２１の密着部分の外側に設けたシール部材８４により更なるシール性の向上が図られている。 Conventionally, as shown in FIG. 5, a curled portion 811 formed at the end of one pipe 81 and a curl formed at the end of the other pipe 82 as a pipe connecting structure in which two pipes are connected by a fastener. A structure is known in which the portion 821 is connected by fastening two fasteners 83 formed in a semi-ring shape along the outer peripheral shape of the pipes 81 and 82 (see Patent Document 1). Specifically, in this structure, a fastening groove 83a is formed on the inner peripheral surface of the semi-ring-shaped fastener 83, and a tapered surface 83b is formed on a part of the side wall constituting the fastening groove 83a. Therefore, when the two fasteners 83 are fastened with bolts (not shown) or the like, the curled portions 811 and 821 are pressed in the axial direction of the pipes 81 and 82 by the tapered surface 83b of the fastener 83 so as to be in close contact with each other. . Further, a seal member 84 is provided on the outer side of the close contact portions of these curled portions 811 and 821. According to such a structure, the curled portions 811 and 821 are pressed and brought into close contact with the taper surface 83b of the fastener 83, so that a certain degree of sealing performance is ensured, and the curled portions 811 and 821 are placed on the outer side of the close contact portions. Further improvement in sealing performance is achieved by the provided sealing member 84.

特開平１１−１６６６７６号公報JP 11-166676 A

しかしながら、従来の技術では、留め具８３のテーパ面８３ｂでカール部８１１，８２１を押す力の一部は、カール部８１１，８２１の先端がさらに曲がることにより吸収されてしまうので、カール部８１１，８２１同士の密着は残りの力で行わなければならず、その分密着性（シール性）が低下するといった問題があった。そのため、シール性の更なる向上を図るためには、パイプ８１，８２同士の密着性を高めることが望まれていた。 However, in the conventional technique, a part of the force that pushes the curled portions 811 and 821 by the tapered surface 83b of the fastener 83 is absorbed by further bending of the leading ends of the curled portions 811 and 821. There is a problem in that the adhesion between the 821s must be performed with the remaining force, and the adhesion (sealability) decreases accordingly. Therefore, in order to further improve the sealing performance, it has been desired to improve the adhesion between the pipes 81 and 82.

そこで、本発明では、二つのパイプの密着性を高めることで、それらの連結部分のシール性を高めることができるパイプの連結構造を提供することを目的とする。 In view of the above, an object of the present invention is to provide a pipe connection structure that can improve the sealing performance of the connecting portions by improving the adhesion between two pipes.

前記課題を解決する本発明のうち請求項１に記載の発明は、第１パイプの一端部に形成された第１フランジと、第２パイプの一端部に形成された第２フランジとを合わせ、前記第１フランジと前記第２フランジとを留め具により連結したパイプの連結構造であって、前記第１フランジは、前記第１パイプの一端部を径方向外側に反り返してなる第１屈曲部と、この第１屈曲部から他端側に真直ぐ延出した第１真直部とを備え、前記第２フランジは、前記第２パイプの一端部を前記第１屈曲部に合致した形状に拡開してなる第２屈曲部と、この第２屈曲部から前記第１パイプ側に真直ぐ延出した第２真直部とを備え、前記留め具は、前記第１フランジの第1真直部の内側に密着するテーパ面を有する円環状の第1ブラケットと、前記第２フランジの第２真直部の外側に密着するテーパ面を有する円環状の第２ブラケットとを備え、前記第１ブラケットと前記第２ブラケットとの間に前記第１フランジおよび前記第２フランジを挟んだ状態で、前記第１ブラケットおよび前記第２ブラケットをパイプ軸方向に締結することで、前記第１パイプおよび前記第２パイプを連結したことを特徴とする。 The invention according to claim 1 of the present invention that solves the above-mentioned problem is that the first flange formed at one end of the first pipe and the second flange formed at one end of the second pipe are combined, A pipe connecting structure in which the first flange and the second flange are connected by a fastener, wherein the first flange is formed by bending one end of the first pipe radially outward. And a first straight portion extending straight from the first bent portion to the other end side, and the second flange expands one end portion of the second pipe into a shape matching the first bent portion. And a second straight portion that extends straight from the second bent portion toward the first pipe, and the fastener is located inside the first straight portion of the first flange. An annular first bracket having a tapered surface to be in close contact with the second flange An annular second bracket having a tapered surface that is in close contact with the outside of the second straight portion, and the first flange and the second flange are sandwiched between the first bracket and the second bracket. The first pipe and the second pipe are connected to each other by fastening the first bracket and the second bracket in the pipe axial direction.

請求項１に記載の発明によれば、第１パイプの第１屈曲部と第２パイプの第２屈曲部を合わせた後、第１ブラケットを第１真直部の内側にセットするとともに、第２ブラケットを第２真直部の外側にセットし、これらをパイプ軸方向に締結することによって、第１ブラケットのテーパ面と第２ブラケットのテーパ面とによって第１真直部および第２真直部が強固に挟持されるので、その密着性が高まることとなる。また、第１ブラケットおよび第２ブラケットをパイプ軸方向に締結することによって、第１真直部および第２真直部を介して押圧された第１屈曲部および第２屈曲部も強固に密着することとなる。そのため、二つのパイプの連結部分のシール性を高めることができる。 According to the first aspect of the present invention, after the first bent portion of the first pipe and the second bent portion of the second pipe are aligned, the first bracket is set inside the first straight portion, and the second By setting the bracket outside the second straight portion and fastening them in the pipe axial direction, the first straight portion and the second straight portion are firmly formed by the tapered surface of the first bracket and the tapered surface of the second bracket. Since it is clamped, the adhesiveness will increase. Further, by fastening the first bracket and the second bracket in the pipe axial direction, the first bent portion and the second bent portion pressed through the first straight portion and the second straight portion are also firmly adhered. Become. Therefore, the sealing performance of the connecting part of the two pipes can be improved.

請求項２に記載の発明は、請求項１に記載のパイプの連結構造であって、前記第１真直部は、前記第１屈曲部から前記第１パイプの他端側に拡開しながら延出するテーパ形状に形成されることを特徴とする。 A second aspect of the present invention is the pipe connection structure according to the first aspect, wherein the first straight portion extends from the first bent portion to the other end side of the first pipe while expanding. It is characterized by being formed in a tapered shape.

請求項２に記載の発明によれば、第１真直部が第１屈曲部から第１パイプの他端側に拡開しながら延出するテーパ形状に形成されるので、第１ブラケットを第１真直部の内側に入れやすくなるといった効果を得ることができる。 According to the second aspect of the present invention, the first straight portion is formed in a tapered shape extending from the first bent portion to the other end side of the first pipe, so that the first bracket is attached to the first bracket. The effect that it becomes easy to put inside the straight portion can be obtained.

請求項１に記載の発明によれば、テーパ面を有する２つのブラケットで２つのパイプの各フランジを挟み込み、それらをパイプ軸方向に締結することによって、２つのフランジの各部分（真直部、屈曲部）を強固に密着させることができるので、二つのパイプの密着性を高めて、それらの連結部分のシール性を高めることができる。 According to the first aspect of the present invention, the flanges of the two pipes are sandwiched between the two brackets having tapered surfaces and are fastened in the pipe axial direction. Part) can be firmly adhered to each other, so that the adhesion of the two pipes can be enhanced and the sealing performance of the connecting portion thereof can be enhanced.

次に、本発明の実施形態について、適宜図面を参照しながら詳細に説明する。参照する図面において、図１は本実施形態に係るパイプの連結構造を示す分解斜視図、図２は各パイプのフランジや留め具を詳細に示す分解断面図、図３は各パイプを留め具で連結させた状態を示す断面図である。 Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In the drawings to be referred to, FIG. 1 is an exploded perspective view showing a pipe connection structure according to the present embodiment, FIG. 2 is an exploded sectional view showing details of flanges and fasteners of each pipe, and FIG. It is sectional drawing which shows the state connected.

図１に示すように、本実施形態に係るパイプの連結構造は、略円筒状に形成される第１パイプ１０および第２パイプ２０と、この第１パイプ１０と第２パイプ２０とを連結するための留め具３０とを備えて構成されている。 As shown in FIG. 1, the pipe connection structure according to the present embodiment connects the first pipe 10 and the second pipe 20 formed in a substantially cylindrical shape, and connects the first pipe 10 and the second pipe 20. And a fastener 30 for this purpose.

第１パイプ１０は、その一端部（第２パイプ２０との連結部）に、捲れるように形成された第１フランジ１１を有している。具体的に、この第１フランジ１１は、図２に示すように、第１パイプ１０の一端部を径方向外側に反り返してなる第１屈曲部１１ａと、この第１屈曲部１１ａから第１パイプ１０の他端側に拡開しながら真直ぐ延出した第１テーパ部（第１真直部）１１ｂとを備えている。 The 1st pipe 10 has the 1st flange 11 formed so that it could curl at the one end part (connection part with the 2nd pipe 20). Specifically, as shown in FIG. 2, the first flange 11 includes a first bent portion 11a formed by bending one end portion of the first pipe 10 radially outward, and a first bent portion 11a to a first bent portion 11a. A first taper portion (first straight portion) 11b that extends straight while expanding on the other end side of the pipe 10 is provided.

第２パイプ２０は、図１に示すように、第１パイプ１０と略同径となるように形成されており、その一端部（第１パイプ１０との連結部）に、第１パイプ１０の第１フランジ１１を覆うように形成された第２フランジ２１を有している。具体的に、この第２フランジ２１は、図２に示すように、第２パイプ２０の一端部を第１パイプ１０の第１屈曲部１１ａに合致した形状に拡開してなる第２屈曲部２１ａと、この第２屈曲部２１ａから第１パイプ１０側に拡開しながら真直ぐ延出した第２テーパ部（第２真直部）２１ｂとを備えている。 As shown in FIG. 1, the second pipe 20 is formed so as to have substantially the same diameter as the first pipe 10, and at one end portion thereof (connecting portion with the first pipe 10) of the first pipe 10. A second flange 21 is formed so as to cover the first flange 11. Specifically, as shown in FIG. 2, the second flange 21 is a second bent portion formed by expanding one end portion of the second pipe 20 into a shape that matches the first bent portion 11 a of the first pipe 10. 21 a and a second taper portion (second straight portion) 21 b that extends straight from the second bent portion 21 a toward the first pipe 10 side.

ここで、この第２テーパ部２１ｂは、その角度が第１テーパ部１１ｂの角度よりも若干大きい角度となるようなテーパ形状に形成されており、これにより、第１パイプ１０の第１屈曲部１１ａと第２パイプ２０の第２屈曲部２１ａとの突き合わせを容易に行うことが可能となっている。なお、各テーパ部１１ｂ，２１ｂの角度は、本実施形態に限定されず、例えば同一であってもよいし、また、第２テーパ部２１ｂの角度を、第１テーパ部１１ｂの角度よりも小さくしてもよい。 Here, the second taper portion 21b is formed in a tapered shape such that the angle is slightly larger than the angle of the first taper portion 11b, whereby the first bent portion of the first pipe 10 is formed. 11a and the second bent portion 21a of the second pipe 20 can be easily matched. In addition, the angle of each taper part 11b, 21b is not limited to this embodiment, For example, the same may be sufficient, and the angle of the 2nd taper part 21b is smaller than the angle of the 1st taper part 11b. May be.

図１に示すように、留め具３０は、円環状の第1ブラケット３１および第２ブラケット３２と、これらを締結するための２対のボルト３３およびナット３４とで構成されている。 As shown in FIG. 1, the fastener 30 includes an annular first bracket 31 and second bracket 32, and two pairs of bolts 33 and nuts 34 for fastening them.

第１ブラケット３１は、一端から他端に向かうにつれて拡径する略円筒状に形成されることで、その外周面および内周面がテーパ面となるように形成されるテーパ円筒部３１ａと、このテーパ円筒部３１ａの他端の全周から径方向外側へ向かって延びる取付フランジ３１ｂとを有している。また、この取付フランジ３１ｂの適所には、径方向外側に延びる２つの延出部３１ｃが形成されており、これらの延出部３１ｃには、それぞれボルト３３を挿通させるためのボルト挿通孔３１ｄが形成されている。なお、この第１ブラケット３１のテーパ円筒部３１ａの外周面は、図２に示すように、所定の角度のテーパ面となるように、所定の加工精度で加工されている。また、この第１ブラケット３１のテーパ円筒部３１ａの先端（一端）の外周縁には、第１パイプ１０の第１屈曲部１１ａの一部に合致する形状となるＲ形状部３１ｅが形成されるとともに、内周縁には、径方向内側に膨出することでテーパ円筒部３１ａの先端の剛性を高める剛性リブ３１ｆが形成されている。 The first bracket 31 is formed in a substantially cylindrical shape that increases in diameter from one end to the other end, so that the outer peripheral surface and the inner peripheral surface are tapered surfaces, And a mounting flange 31b extending radially outward from the entire circumference of the other end of the tapered cylindrical portion 31a. In addition, two extending portions 31c extending radially outward are formed at appropriate positions of the mounting flange 31b, and bolt extending holes 31d for inserting bolts 33 are respectively inserted into these extending portions 31c. Is formed. As shown in FIG. 2, the outer peripheral surface of the tapered cylindrical portion 31a of the first bracket 31 is processed with a predetermined processing accuracy so as to be a tapered surface having a predetermined angle. Further, an R-shaped portion 31e having a shape that matches a part of the first bent portion 11a of the first pipe 10 is formed on the outer peripheral edge of the tip (one end) of the tapered cylindrical portion 31a of the first bracket 31. At the same time, a rigid rib 31f is formed on the inner periphery to increase the rigidity of the tip of the tapered cylindrical portion 31a by bulging inward in the radial direction.

なお、本実施形態では、テーパ円筒部３１ａの先端にＲ形状部３１ｅを形成したが、本発明はこれに限定されず、テーパ円筒部３１ａは少なくとも第１パイプ１０の第１テーパ部１１ｂに密着する面を有していればよい。ただし、本実施形態のように、Ｒ形状部３１ｅを設けた場合は、このＲ形状部３１ｅによって第１パイプ１０の第１屈曲部１１ａを第２パイプ２０の第２屈曲部２１ａに積極的に押し付けて、これらを強固に密着させることができる。 In the present embodiment, the R-shaped portion 31e is formed at the tip of the tapered cylindrical portion 31a. However, the present invention is not limited to this, and the tapered cylindrical portion 31a is in close contact with at least the first tapered portion 11b of the first pipe 10. What is necessary is just to have the surface to do. However, when the R-shaped portion 31e is provided as in the present embodiment, the first bent portion 11a of the first pipe 10 is positively engaged with the second bent portion 21a of the second pipe 20 by the R-shaped portion 31e. These can be pressed and firmly adhered.

図１に示すように、第２ブラケット３２は、第１ブラケット３１と略同形状となるテーパ円筒部３２ａ、取付フランジ３２ｂ、延出部３２ｃおよびボルト挿通孔３２ｄを有している。そして、この第２ブラケット３２のテーパ円筒部３２ａの内周面は、第１ブラケット３１のテーパ円筒部３１ａの外周面と略同一の角度のテーパ面となるように、所定の加工精度で加工されている（図２参照）。 As shown in FIG. 1, the second bracket 32 has a tapered cylindrical portion 32a, a mounting flange 32b, an extending portion 32c, and a bolt insertion hole 32d that have substantially the same shape as the first bracket 31. The inner peripheral surface of the tapered cylindrical portion 32a of the second bracket 32 is processed with a predetermined processing accuracy so as to be a tapered surface having substantially the same angle as the outer peripheral surface of the tapered cylindrical portion 31a of the first bracket 31. (See FIG. 2).

なお、図２に示すように、第２ブラケット３２には、第１ブラケット３１のようなＲ形状部３１ｅ、すなわち第２パイプ２０の第２屈曲部２１ａの一部に合致する形状となるＲ形状部を設けていないが、本発明はこれに限定されず、第２ブラケット３２に第２屈曲部２１ａの一部に合致するＲ形状部を設けることで、第２パイプ２０の第２屈曲部２１ａを第１パイプ１０の第１屈曲部１１ａに積極的に押し付けることができるようにしてもよい。 As shown in FIG. 2, the second bracket 32 has an R shape that matches the R-shaped portion 31 e of the first bracket 31, that is, a part of the second bent portion 21 a of the second pipe 20. However, the present invention is not limited to this, and the second bent portion 21a of the second pipe 20 is provided by providing the second bracket 32 with an R-shaped portion that matches a part of the second bent portion 21a. May be positively pressed against the first bent portion 11 a of the first pipe 10.

また、前記した第１ブラケット３１と第２ブラケット３２を完全に締結させた状態（所定の締付トルクをボルト３３に与えた状態）においては、各取付フランジ３１ｂ，３２ｂが当接しないように、すなわち各取付フランジ３１ｂ，３２ｂの間に所定の隙間が生じるように、各ブラケット３１，３２が形成されている。これにより、テーパ円筒部３１ａの外周面およびテーパ円筒部３２ａの内周面によって各フランジ１１，２１の各テーパ部１１ｂ，２１ｂを強固に挟持することが可能となっている。 Further, in the state where the first bracket 31 and the second bracket 32 are completely fastened (a state where a predetermined tightening torque is applied to the bolt 33), the mounting flanges 31b and 32b are not brought into contact with each other. That is, the brackets 31 and 32 are formed so that a predetermined gap is generated between the mounting flanges 31b and 32b. Thereby, the taper portions 11b and 21b of the flanges 11 and 21 can be firmly held by the outer peripheral surface of the tapered cylindrical portion 31a and the inner peripheral surface of the tapered cylindrical portion 32a.

次に、留め具３０による第１パイプ１０と第２パイプ２０との連結方法について図４を参照して説明する。参照する図面において、図４は第１パイプと第２パイプを突き合わせた状態を示す要部拡大断面図（ａ）と、第１パイプと第２パイプの各フランジに留め具を仮止めした状態を示す要部拡大断面図（ｂ）と、留め具を最後まで締め付けた状態を示す要部拡大断面図（ｃ）である。 Next, a method of connecting the first pipe 10 and the second pipe 20 by the fastener 30 will be described with reference to FIG. In the drawings to be referred to, FIG. 4 is an enlarged cross-sectional view (a) showing a state in which the first pipe and the second pipe are butted together, and a state in which the fasteners are temporarily fixed to the flanges of the first pipe and the second pipe. It is the principal part expanded sectional view (b) which shows, and the principal part expanded sectional view (c) which shows the state which clamp | tightened the fastener to the last.

図４（ａ）に示すように、第１パイプ１０の第１屈曲部１１ａと第２パイプ２０の第２屈曲部２１ａを合わせた後、図４（ｂ）に示すように、第１ブラケット３１を第１フランジ１１の第１テーパ部１１ｂの内側にセットするとともに、第２ブラケット３２を第２フランジ２１の第２テーパ部２１ｂの外側にセットして、これらのブラケット３１，３２をボルト３３およびナット３４で仮止めする。そして、このように各テーパ部１１ｂ，２１ｂを各ブラケット３１，３２で挟んだ状態から、図４（ｃ）に示すように、各ブラケット３１，３２をボルト３３およびナット３４によってパイプ軸方向に締結すると、第１ブラケット３１のテーパ円筒部３１ａの外周面と第２ブラケット３２のテーパ円筒部３２ａの内周面とによって第１テーパ部１１ｂおよび第２テーパ部２１ｂが挟持されて強固に密着することとなる。また、各ブラケット３１，３２をパイプ軸方向に締結することによって、第１テーパ部１１ｂおよび第２テーパ部２１ｂを介して第１屈曲部１１ａおよび第２屈曲部２１ａがパイプ軸方向において互いに向き合うように押圧されるので、各屈曲部１１ａ，２１ａも強固に密着することとなる。さらに、第１屈曲部１１ａは、第１ブラケット３１のＲ形状部３１ｅによっても第２屈曲部２１ａ側に押圧されるので、各屈曲部１１ａ，２１ａは、より強固に密着するようになっている。 As shown in FIG. 4A, after the first bent portion 11a of the first pipe 10 and the second bent portion 21a of the second pipe 20 are combined, as shown in FIG. Is set inside the first taper portion 11b of the first flange 11, and the second bracket 32 is set outside the second taper portion 21b of the second flange 21, and these brackets 31, 32 are connected to the bolt 33 and Temporarily fix with the nut 34. Then, from the state where the taper portions 11b and 21b are sandwiched between the brackets 31 and 32 as described above, the brackets 31 and 32 are fastened in the pipe axial direction by bolts 33 and nuts 34 as shown in FIG. Then, the 1st taper part 11b and the 2nd taper part 21b are pinched | interposed by the outer peripheral surface of the taper cylindrical part 31a of the 1st bracket 31, and the inner peripheral surface of the taper cylinder part 32a of the 2nd bracket 32, and it adheres firmly. It becomes. Further, by fastening the brackets 31 and 32 in the pipe axial direction, the first bent portion 11a and the second bent portion 21a face each other in the pipe axial direction via the first tapered portion 11b and the second tapered portion 21b. Therefore, the bent portions 11a and 21a are also firmly attached. Further, since the first bent portion 11a is pressed toward the second bent portion 21a also by the R-shaped portion 31e of the first bracket 31, each bent portion 11a, 21a is more closely attached. .

以上によれば、本実施形態において、次のような効果を得ることができる。
テーパ面を有する２つのブラケット３１，３２で２つのパイプ１０，２０の各フランジ１１，２１を挟み込み、それらをパイプ軸方向に締結することによって、２つのフランジ１１，２１の各部分（テーパ部１１ｂ，２１ｂ、屈曲部１１ａ，２１ａ）を強固に密着させることができるので、二つのパイプ１０，２０の密着性を高めて、それらの連結部分のシール性を高めることができる。 According to the above, the following effects can be obtained in the present embodiment.
By sandwiching the flanges 11 and 21 of the two pipes 10 and 20 with the two brackets 31 and 32 having tapered surfaces and fastening them in the pipe axial direction, each portion of the two flanges 11 and 21 (tapered portion 11b). , 21b and the bent portions 11a, 21a) can be firmly adhered to each other, so that the adhesion of the two pipes 10, 20 can be enhanced, and the sealing performance of the connecting portion can be enhanced.

第１テーパ部１１ｂが第１屈曲部１１ａから第１パイプ１０の他端側に拡開しながら延出するテーパ形状に形成されるので、第１ブラケット３１を第１テーパ部１１ｂの内側に入れやすくなるといった効果を得ることができる。 Since the first tapered portion 11b is formed in a tapered shape extending from the first bent portion 11a to the other end side of the first pipe 10, the first bracket 31 is placed inside the first tapered portion 11b. The effect that it becomes easy can be acquired.

また、各ブラケット３１，３２で各フランジ１１，２１の各テーパ部１１ｂ，２１ｂを挟み込み、各テーパ部１１ｂ，２１ｂを密着させるので、従来のような２つの留め具に対して付与するパイプ径方向における締結力を、各留め具の溝と各パイプのカール部との作用によってパイプ軸方向における密着力に変換する構造に比べ、パイプ軸方向における密着力が均一となって、フランジのひずみが防止される。ちなみに、従来の構造は、２つの留め具を強固に締結させる関係上、それらの合わせ面の間に所定の隙間を設ける必要があるため、その隙間の部分においては、パイプ径方向の締結力がパイプ軸方向の密着力に変換されず、締結力が均一にならないようになっている。以上により、本実施形態の構造によれば、安定した密着力が得られ、パイプの結合強度およびリーク性能（ガス等の漏れに対する性能）を向上させることができる。 Moreover, since each taper part 11b and 21b of each flange 11 and 21 is pinched | interposed with each bracket 31 and 32 and each taper part 11b and 21b is contact | adhered, the pipe radial direction provided with respect to two conventional fasteners Compared to the structure that converts the fastening force in the pipe to the adhesive force in the pipe axial direction by the action of the groove of each fastener and the curled portion of each pipe, the adhesive force in the pipe axial direction becomes uniform, preventing flange distortion Is done. Incidentally, in the conventional structure, since it is necessary to provide a predetermined gap between the mating surfaces because the two fasteners are firmly fastened, the fastening force in the pipe radial direction is not provided in the gap portion. It is not converted into the adhesive force in the pipe axial direction, and the fastening force is not uniform. As described above, according to the structure of the present embodiment, stable adhesion can be obtained, and the coupling strength and leakage performance (performance against leakage of gas or the like) of the pipe can be improved.

なお、本発明は、前記実施形態に限定されることなく、様々な形態で実施される。
前記実施形態では、断面形状が略真円状となるパイプ１０，２０に本発明を適用したが、本発明はこれに限定されず、例えば楕円状のパイプや略四角形のパイプなどに本発明を適用してもよい。 In addition, this invention is implemented in various forms, without being limited to the said embodiment.
In the above-described embodiment, the present invention is applied to the pipes 10 and 20 having a substantially circular cross-sectional shape. You may apply.

前記実施形態では、第１パイプ１０と第２パイプ２０とのシール性を、これらのパイプ１０，２０を圧着させることのみで確保しているが、本発明はこれに限定されず、例えば第２テーパ部２１ｂの先端近傍（段差となった部分）に、シール部材を設けてもよい。これによれば、更なるシール性の向上を図ることができる。ただし、本発明は、シール部材を設けなくてもシール性が確保されるメリットを有するので、例えばラバー状のシール部材を設けるのが好ましくない環境（排気熱によって高温となる排気管の連結構造など）において大きな効果を奏することとなる。 In the above embodiment, the sealing performance between the first pipe 10 and the second pipe 20 is ensured only by pressure-bonding the pipes 10 and 20, but the present invention is not limited to this. A seal member may be provided in the vicinity of the tip of the taper portion 21b (the stepped portion). According to this, it is possible to further improve the sealing performance. However, since the present invention has an advantage that sealing performance is ensured without providing a seal member, for example, an environment in which it is not preferable to provide a rubber-like seal member (such as a connection structure of an exhaust pipe that is heated by exhaust heat) ) Has a great effect.

なお、本実施形態では、第１ブラケット３１のテーパ円筒部３１ａを、外周面および内周面がともにテーパ面となるように形成したが、本発明はこれに限定されず、少なくとも外周面がテーパ面となっていれば、例えば内周面は軸方向を中心とした円筒面状に形成されていてもよい。また、これとは逆に、第２ブラケット３２のテーパ円筒部３２ａは、少なくとも内周面がテーパ面となっていれば、例えば外周面は軸方向を中心とした円筒面状に形成されていてもよい。 In the present embodiment, the tapered cylindrical portion 31a of the first bracket 31 is formed such that both the outer peripheral surface and the inner peripheral surface are tapered surfaces. However, the present invention is not limited to this, and at least the outer peripheral surface is tapered. If it is a surface, for example, the inner peripheral surface may be formed in a cylindrical surface shape with the axial direction as the center. On the contrary, the tapered cylindrical portion 32a of the second bracket 32 has, for example, an outer peripheral surface that is formed in a cylindrical surface centered in the axial direction as long as the inner peripheral surface is a tapered surface. Also good.

本実施形態に係るパイプの連結構造を示す分解斜視図である。It is a disassembled perspective view which shows the connection structure of the pipe which concerns on this embodiment. 各パイプのフランジや留め具を詳細に示す分解断面図である。It is a disassembled sectional view which shows the flange and fastener of each pipe in detail. 各パイプを留め具で連結させた状態を示す断面図である。It is sectional drawing which shows the state which connected each pipe with the fastener. 第１パイプと第２パイプを突き合わせた状態を示す要部拡大断面図（ａ）と、第１パイプと第２パイプの各フランジに留め具を仮止めした状態を示す要部拡大断面図（ｂ）と、留め具を最後まで締め付けた状態を示す要部拡大断面図（ｃ）である。The principal part expanded sectional view (a) which shows the state which faced | matched the 1st pipe and the 2nd pipe, and the principal part expanded sectional view which shows the state which fastened the fastener to each flange of the 1st pipe and the 2nd pipe (b) ) And an enlarged sectional view (c) of a main part showing a state where the fastener is tightened to the end. 従来のパイプの連結構造を示す断面図である。It is sectional drawing which shows the connection structure of the conventional pipe.

Explanation of symbols

１０第１パイプ
１１第１フランジ
１１ａ第１屈曲部
１１ｂ第１テーパ部（第１真直部）
２０第２パイプ
２１第２フランジ
２１ａ第２屈曲部
２１ｂ第２テーパ部（第２真直部）
３０留め具
３１第１ブラケット
３１ａテーパ円筒部
３１ｂ取付フランジ
３１ｃ延出部
３１ｄボルト挿通孔
３１ｅＲ形状部
３１ｆ剛性リブ
３２第２ブラケット
３２ａテーパ円筒部
３２ｂ取付フランジ
３２ｃ延出部
３２ｄボルト挿通孔
３３ボルト
３４ナット 10 1st pipe 11 1st flange 11a 1st bending part 11b 1st taper part (1st straight part)
20 2nd pipe 21 2nd flange 21a 2nd bending part 21b 2nd taper part (2nd straight part)
30 fasteners 31 first bracket 31a taper cylindrical portion 31b mounting flange 31c extension portion 31d bolt insertion hole 31e R shape portion 31f rigid rib 32 second bracket 32a taper cylindrical portion 32b mounting flange 32c extension portion 32d bolt insertion hole 33 bolt 34 nuts

Claims

A pipe in which a first flange formed at one end of the first pipe and a second flange formed at one end of the second pipe are combined, and the first flange and the second flange are connected by a fastener. A connected structure,
The first flange includes a first bent portion formed by curving one end portion of the first pipe radially outward, and a first straight portion extending straight from the first bent portion to the other end side,
The second flange includes a second bent portion formed by expanding one end of the second pipe into a shape that matches the first bent portion, and extends straight from the second bent portion toward the first pipe. The second straight portion,
The fastener includes an annular first bracket having a tapered surface closely contacting the inside of the first straight portion of the first flange, and a circle having a tapered surface closely contacting the outside of the second straight portion of the second flange. An annular second bracket,
By fastening the first bracket and the second bracket in the pipe axial direction in a state where the first flange and the second flange are sandwiched between the first bracket and the second bracket, A pipe connection structure characterized by connecting a pipe and the second pipe.

The pipe connection structure according to claim 1,
The pipe connecting structure, wherein the first straight part is formed in a tapered shape extending from the first bent part to the other end side of the first pipe.