JP6977132B1

JP6977132B1 - Delivery pipe

Info

Publication number: JP6977132B1
Application number: JP2020171504A
Authority: JP
Inventors: 知行才尾
Original assignee: Kanbishi Corp
Current assignee: Kanbishi Corp
Priority date: 2020-10-09
Filing date: 2020-10-09
Publication date: 2021-12-08
Anticipated expiration: 2040-10-09
Also published as: JP2022063127A

Abstract

【課題】燃料のデリバリパイプにおいて、本体部と本体部の開口端部を閉塞するプラグとの高い接合強度と液密性とを容易に実現することができるデリバリパイプを提供する。【解決手段】デリバリパイプは本体部とプラグとを備え、筒状の本体部の開口端部には第１の溶着部を有している。プラグは突起部及び当接部を有し、突起部は、当接部の端面に対して傾斜する第２の溶着部を有している。本体部とプラグとは第１の溶着部と第２の溶着部との溶着により接合され、また本体部の開口端部の端面とプラグの当接部の端面とが互いに接触している。【選択図】図２PROBLEM TO BE SOLVED: To provide a delivery pipe capable of easily realizing high bonding strength and liquidtightness between a main body and a plug closing an open end of the main body in a fuel delivery pipe. A delivery pipe includes a main body and a plug, and has a first welded portion at an open end of a cylindrical main body. The plug has a protrusion and a contact portion, and the protrusion has a second welded portion inclined with respect to the end surface of the contact portion. The main body and the plug are joined by welding the first welded portion and the second welded portion, and the end surface of the open end portion of the main body portion and the end surface of the contact portion of the plug are in contact with each other. [Selection diagram] Fig. 2

Description

本発明は、燃料を分配するデリバリパイプに関する。 The present invention relates to a delivery pipe that distributes fuel.

デリバリパイプ（分配管）は、内燃機関の燃料タンク内の燃料をシリンダヘッド部に分配供給するための燃料通路である。
デリバリパイプは、燃料通路となるパイプ状の本体部を備え、本体部の一端は溶着されたプラグにより液密に閉塞されている。
デリバリパイプには、例えば−３５［℃］〜＋１５０［℃］程度の環境温度で、供給燃料の高い圧力が負荷されるため、本体部とプラグとは高い接合強度で溶着する必要がある。 The delivery pipe (separate pipe) is a fuel passage for distributing and supplying fuel in the fuel tank of the internal combustion engine to the cylinder head portion.
The delivery pipe is provided with a pipe-shaped main body portion that serves as a fuel passage, and one end of the main body portion is liquid-tightly closed by a welded plug.
Since the delivery pipe is loaded with a high pressure of the supplied fuel at an environmental temperature of, for example, about −35 [° C.] to +150 [° C.], it is necessary to weld the main body and the plug with high bonding strength.

特開２０１４−９６８０号公報Japanese Unexamined Patent Publication No. 2014-9680 ＷＯ２０２０／０５４３１９WO2020 / 054319

特許文献１は、本体部の開口端部にフランジを設け、３重の溶着部により開口端部とプラグとを溶着する技術が開示されている。
さらなる高い接合強度を得るために、特許文献２には、異なる溶着面を異なるモードで溶着させる超音波溶着方法が開示されている。特許文献２の溶着方法により強固で安定した接合を実現することができる。しかし、溶着部の形状に対する高度な設計力や超音波制御条件設定が必要となり、開発設計コストを増大させることがある。 Patent Document 1 discloses a technique in which a flange is provided at the open end of the main body and the open end and the plug are welded by a triple welding portion.
In order to obtain a higher bonding strength, Patent Document 2 discloses an ultrasonic welding method in which different welding surfaces are welded in different modes. A strong and stable bonding can be realized by the welding method of Patent Document 2. However, advanced design force for the shape of the welded portion and setting of ultrasonic control conditions are required, which may increase the development design cost.

本発明は、上記に鑑みてなされたものであり、本体部の開口端部と開口端部を閉塞するプラグとの高い接合強度と液密性とを容易に実現することができるデリバリパイプを提供することを課題する。 The present invention has been made in view of the above, and provides a delivery pipe that can easily realize high bonding strength and liquidtightness between the open end of the main body and the plug that closes the open end. Challenge to do.

本発明に係るデリバリパイプは、
開口端部（８）を有する筒状の本体部（２）と前記開口端部（８）を閉塞するプラグ（３）とを備え、
前記本体部（２）と前記プラグ（３）とが１つの接合部（Ｊ）のみにより接合され、
前記本体部（２）は、前記開口端部（８）に外縁部（２０）を有し、前記外縁部（２０）は第１の溶着部（２１）を有し、
前記プラグ（３）は、前記第１の溶着部（２１）よりも内周側に突起部（３０）、前記第１の溶着部（２１）よりも外周側に当接部（３２）を有し、
前記突起部（３０）は、前記当接部（３２）の端面（３３）に対して傾斜する第２の溶着部（３１）を有し、
前記接合部（Ｊ）は、前記当接部（３２）の端面（３３）より前記本体部（２）側に位置し、
前記接合部（Ｊ）において前記第１の溶着部（２１）と前記第２の溶着部（３１）とが溶着され、
前記開口端部（８）の端面（２４）と前記当接部（３２）の端面（３３）とが非溶融状態で接触していることを特徴とする
The delivery pipe according to the present invention is
A cylindrical main body portion (2) having an open end portion (8) and a plug (3) for closing the open end portion (8) are provided.
The main body portion (2) and the plug (3) are joined by only one joint portion (J).
The main body portion (2) has an outer edge portion (20) at the open end portion (8), and the outer edge portion (20) has a first welded portion (21).
The plug (3), the projecting portion on the inner peripheral side than the first weld portion (21) (30), have a contact portion (32) on the outer peripheral side of the first weld portion (21) death,
The protrusion (30) has a second welded portion (31) that is inclined with respect to the end surface (33) of the contact portion (32).
The joint portion (J) is located on the main body portion (2) side of the end surface (33) of the contact portion (32).
At the joint portion (J), the first welded portion (21) and the second welded portion (31) are welded.
The end face (24) of the open end portion (8) and the end face (33) of the contact portion (32) are in contact with each other in a non-melted state.

このような構成とすることで、当接部（３２）により本体部（２）とプラグ（３）との相対的位置関係が確定し、高い接合強度を有する本体部（２）とプラグ（３）との溶着を容易に提供することができる。 With such a configuration, the relative positional relationship between the main body portion (2) and the plug (3) is determined by the contact portion (32), and the main body portion (2) and the plug (3) having high bonding strength are established. ) Can be easily provided.

また、本発明に係るデリバリパイプでは、さらに、
前記プラグ（３）は、前記第２の溶着部（３１）と前記当接部（３２）との間に溝（３６）を有し、
前記溝（３６）と、前記溝（３６）に対向する前記端面（２４）とにより構成された、溶融樹脂の第１の樹脂収容部（１０）を有することを特徴とすることもできる。 Further, in the delivery pipe according to the present invention, further
The plug (3) has a groove (36) between the second welded portion (31) and the abutting portion (32).
It can also be characterized by having a first resin accommodating portion (10) of the molten resin, which is composed of the groove (36) and the end face (24) facing the groove (36) .

このような構成とすることで、溶融した樹脂を収容し、バリ（食み出し）の発生を防止するとともに、第１の樹脂収容部（１０）での接合を効果的に得ることができる。なお、第１の樹脂収容部（１０）は、完成品としてのデリバリパイプにおいては、溶融した樹脂がその大半に流れ込んでいる箇所となるが、樹脂が溶融する前の状態では間隙であるため、間隙（１０）と呼ぶ場合がある。 With such a configuration, the molten resin can be accommodated, burrs (squeeze out) can be prevented , and bonding at the first resin accommodating portion (10) can be effectively obtained. The first resin accommodating portion (10) is a portion where the molten resin flows into most of the delivery pipe as a finished product, but since it is a gap before the resin is melted, it is a gap. It may be called a gap (10).

上記構成においては、さらに、
前記溝（３６）は平坦な底面を有し、
前記溝（３６）に対向する前記端面（２４）が平坦であることを特徴とすることもできる。 In the above configuration,
The groove (36) has a flat bottom surface and has a flat bottom surface.
It can also be characterized in that the end face (24) facing the groove (36) is flat .

このような構成とすることで、燃料の圧力が印加されるデリバリパイプにおいて、効果的に本体部（２）とプラグ（３）との接合の強度と液密性を容易に向上させることができる。 With such a configuration, in the delivery pipe to which the fuel pressure is applied, the strength and liquidtightness of the joint between the main body portion (2) and the plug (3) can be easily improved. ..

上記構成においては、さらに、
前記第１の溶着部（２１）に繋がる内壁面（２２）と前記突起部（３０）の前記第２の溶着部（３１）の前記本体部（２）側への延長部（３５）における前記内壁面（２２）と対向する側壁部（３４）とにより構成された、溶融樹脂の第２の樹脂収容部（１１）を有することを特徴とすることもできる。 In the above configuration,
The said in the extension portion (35) of the inner wall surface (22) connected to the first welded portion (21) and the protruding portion (30) to the main body portion (2) side of the second welded portion (31). It can also be characterized by having a second resin accommodating portion (11) of the molten resin, which is composed of a side wall portion (34) facing the inner wall surface (22) .

上記構成においては、さらに、前記側壁部（３４）は、前記第１の溶着部（２１）に繋がる前記内壁面（２２）に対して傾斜し、前記延長部（３５）の前記側壁面（３４）と前記内壁面（２２）との距離は、前記突起部（３０）の先端ほど長くなることを特徴とすることもできる。 In the above configuration, the side wall portion (34) is further inclined with respect to the inner wall surface (22) connected to the first welding portion (21), and the side wall surface (34) of the extension portion (35) is further inclined. ) And the inner wall surface (22) may be characterized in that the distance becomes longer toward the tip of the protrusion (30) .

このような構成とすることで、間隙（１１）での接合を効果的に得ることができ、また、間隙（１０）と間隙（１１）とに拡がる樹脂の配分の調整を行うことも可能となる。なお、第２の樹脂収容部（１１）は、完成品としてのデリバリパイプにおいては、溶融した樹脂がその大半に流れ込んでいる箇所となるが、樹脂が溶融する前の状態では間隙であるため、間隙（１１）と呼ぶ場合がある。

With such a configuration, it is possible to effectively obtain the bonding in the gap (11), and it is also possible to adjust the distribution of the resin spreading in the gap (10) and the gap (11). Become. The second resin accommodating portion (11) is a portion where the melted resin flows into most of the delivery pipe as a finished product, but since it is a gap before the resin melts, it is a gap. It may be called a gap (11).

本発明によれば、本体部の開口端部と開口端部を閉塞するプラグとの高い接合強度と液密性とを容易に実現することができるデリバリパイプを提供することができる。 According to the present invention, it is possible to provide a delivery pipe that can easily realize high bonding strength and liquidtightness between the open end of the main body and the plug that closes the open end.

図１は、実施形態１の樹脂製のデリバリパイプ１を示し、図１（Ａ）はデリバリパイプ１の斜視図であり、図１（Ｂ）は、デリバリパイプ１のＸ−Ｘ線断面図である。1A and 1B show the resin delivery pipe 1 of the first embodiment, FIG. 1A is a perspective view of the delivery pipe 1, and FIG. 1B is a sectional view taken along line XX of the delivery pipe 1. be. 図２は、本体部２の開口端部８にプラグ３を溶着する主要工程を示す断面図である。FIG. 2 is a cross-sectional view showing a main process of welding the plug 3 to the open end portion 8 of the main body portion 2. 図３は、超音波溶着の工程において、プラグ３の本体部２への沈み込み量（ｄ）の時間変化を示すグラフであり、図３（Ａ）は当接部３２を有しない場合、図３（Ｂ）は当接部３２を有する場合の沈み込み量の時間変化を示す。FIG. 3 is a graph showing the time change of the amount (d) of the plug 3 sinking into the main body 2 in the ultrasonic welding process, and FIG. 3 (A) is a graph showing the case where the contact portion 32 is not provided. 3 (B) shows the time change of the sinking amount when the contact portion 32 is provided. 図４は、プラグ３と本体部２の開口端部８の溶着箇所近傍の断面拡大図である。図４（Ａ）は燃料の圧力の影響を示す模式図であり、図４（Ｂ）は溶着時に溶解した樹脂の広がりを示す模式図である。FIG. 4 is an enlarged cross-sectional view of the vicinity of the welded portion between the plug 3 and the open end portion 8 of the main body portion 2. FIG. 4A is a schematic diagram showing the influence of fuel pressure, and FIG. 4B is a schematic diagram showing the spread of the resin melted during welding. 図５は実施形態２におけるプラグ３と本体部２の開口端部の溶着箇所近傍の断面拡大図である。図５（Ａ）はプラグ３の略円環状の突起部３０の幾何学的形状を説明する断面図であり、図５（Ｂ）は溶着時に溶解した樹脂の広がりを示す模式図である。FIG. 5 is an enlarged cross-sectional view of the vicinity of the welded portion between the plug 3 and the open end portion of the main body portion 2 in the second embodiment. FIG. 5A is a cross-sectional view illustrating the geometric shape of the substantially annular protrusion 30 of the plug 3, and FIG. 5B is a schematic view showing the spread of the resin melted during welding.

以下、図面を参照して本発明の実施形態について説明する。但し、以下の実施形態は、いずれも本発明の要旨の認定において限定的な解釈を与えるものではない。また、同一又は同種の部材については同じ参照符号を付して、説明を省略することがある。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, none of the following embodiments give a limiting interpretation in finding the gist of the present invention. Further, the same or the same kind of members may be designated by the same reference numerals and the description thereof may be omitted.

（実施形態１）
図１は本実施形態の樹脂製のデリバリパイプ１を示し、図１（Ａ）はデリバリパイプ１の斜視図であり、図１（Ｂ）はデリバリパイプ１のＸ−Ｘ線断面図である。 (Embodiment 1)
1A and 1B show a resin-made delivery pipe 1 of the present embodiment, FIG. 1A is a perspective view of the delivery pipe 1, and FIG. 1B is a sectional view taken along line XX of the delivery pipe 1.

デリバリパイプ１（燃料デリバリパイプ）は、少なくとも一端が開口した筒状の本体部２と、本体部２の開口端部を閉塞するプラグ３とを備えている。本体部２の胴部（両端部の間）に一列に複数のインジェクター用の接続口４が設けられている。
本体部２は固定具５にネジ等を挿通し、螺着することでエンジン等に固定される。本体部の内部には燃料タンクより燃料を送り出すためのパイプ６が設けられている。
パイプ６の先端部７は、燃料供給配管を経由して燃料タンク（不図示）に接続されている。燃料ポンプ（不図示）からの吐出圧によってインジェクター用の接続口４に燃料が圧送される。 The delivery pipe 1 (fuel delivery pipe) includes a cylindrical main body portion 2 having at least one end open, and a plug 3 that closes the open end portion of the main body portion 2. A plurality of injector connection ports 4 are provided in a row on the body portion (between both ends) of the main body portion 2.
The main body 2 is fixed to the engine or the like by inserting a screw or the like into the fixture 5 and screwing the screw or the like. A pipe 6 for sending out fuel from the fuel tank is provided inside the main body.
The tip portion 7 of the pipe 6 is connected to a fuel tank (not shown) via a fuel supply pipe. Fuel is pumped to the injector connection port 4 by the discharge pressure from the fuel pump (not shown).

本体部２とプラグ３に使用する樹脂材料として、例えば６６ナイロン、芳香族ナイロン又はＰＢＴ（ポリブチレンテレフタレート）等の樹脂が採用できる。
特に６６ナイロンは、耐熱性、耐燃料油性、耐振強度、耐衝撃性、成形精度、コストの点で好適に使用することができる。また、溶着の観点からは、好適には本体部２とプラグ３とは同材を使用する。 As the resin material used for the main body 2 and the plug 3, for example, 66 nylon, aromatic nylon, or a resin such as PBT (polybutylene terephthalate) can be adopted.
In particular, 66 nylon can be suitably used in terms of heat resistance, fuel oil resistance, vibration resistance, impact resistance, molding accuracy, and cost. Further, from the viewpoint of welding, preferably, the same material is used for the main body 2 and the plug 3.

プラグ３は、本体部２の開口端部８に液密に溶着され、開口端部８を閉塞する。
図１（Ｂ）中に点線で描かれた領域Ｐでの溶着方法について、以下詳細に説明する。 The plug 3 is liquid-tightly welded to the open end 8 of the main body 2 and closes the open end 8.
The welding method in the region P drawn by the dotted line in FIG. 1B will be described in detail below.

図２は、本体部２の開口端部８にプラグ３を溶着する主要工程を示す断面図であり、図１（Ｂ）の領域Ｐの断面拡大図である。 FIG. 2 is a cross-sectional view showing a main process of welding the plug 3 to the open end portion 8 of the main body portion 2, and is an enlarged cross-sectional view of the region P of FIG. 1 (B).

図２（Ａ）に示すように、本体部２とプラグ３とを互いに対向して超音波溶着装置（図示しない）に配置する。
本体部２の開口端部８には、外縁部２０（フランジ部）が備えられ、外縁部２０には第１の溶着部２１（本体側溶着部）が備えられており、外縁部２０の一部が第１の溶着部２１を構成している。第１の溶着部２１の断面はエッジ形状（実質的に直角なエッジ）を有する。
さらに、本体部２は、第１の溶着部２１を有する外縁部２０の側壁面２２に対向した保護壁２３を備えている。側壁面２２は本体部２の長尺方向（図中Ｙ方向）に平行である。開口端部８は、外縁部２０において、本体部２の長尺方向に垂直で平坦な端面２４を有する。
なお、図中Ｘ方向は、長尺方向に垂直な方向を示す。 As shown in FIG. 2A, the main body 2 and the plug 3 are arranged in an ultrasonic welding device (not shown) so as to face each other.
The open end portion 8 of the main body portion 2 is provided with an outer edge portion 20 (flange portion), and the outer edge portion 20 is provided with a first welded portion 21 (main body side welded portion). The portion constitutes the first welded portion 21. The cross section of the first welded portion 21 has an edge shape (substantially right-angled edge).
Further, the main body portion 2 is provided with a protective wall 23 facing the side wall surface 22 of the outer edge portion 20 having the first welded portion 21. The side wall surface 22 is parallel to the long direction (Y direction in the figure) of the main body 2. The open end portion 8 has a flat end surface 24 that is perpendicular to the elongated direction of the main body portion 2 at the outer edge portion 20.
In the figure, the X direction indicates a direction perpendicular to the long direction.

プラグ３の本体部２側には溶着用の突起部３０を備える。突起部３０は、略円環状であり、本体部２の第１の溶着部２１と溶着する第２の溶着部３１（プラグ側溶着部）を備えている。第２の溶着部３１の外壁面の断面は、Ｘ方向に対して所定の角度θ１（例えば４０−５５度）で傾斜しており、プラグ３の第２の溶着部３１の傾斜した平坦面（図中点線で囲む領域）と本体部２の第１の溶着部２１のエッジとが接触する。プラグ３が本体部２と接合された状態では、突起部３０は、本体部２の側壁面２２と保護壁２３との間に位置する（図２（Ｃ）参照）。保護壁２３は、燃料の圧力の変動が直接的に突起部３０に印加されることを軽減するとともに溶融代の樹脂ｒ２（図４（Ｂ）参照）が本体部２の内部に流出することを防止する。 A protrusion 30 for welding is provided on the main body 2 side of the plug 3. The protrusion 30 is substantially annular and includes a second welded portion 31 (plug-side welded portion) that is welded to the first welded portion 21 of the main body portion 2. The cross section of the outer wall surface of the second welded portion 31 is inclined at a predetermined angle θ1 (for example, 40-55 degrees) with respect to the X direction, and the inclined flat surface of the second welded portion 31 of the plug 3 (for example, 40-55 degrees). The area surrounded by the dotted line in the figure) and the edge of the first welded portion 21 of the main body portion 2 come into contact with each other. When the plug 3 is joined to the main body 2, the protrusion 30 is located between the side wall surface 22 of the main body 2 and the protective wall 23 (see FIG. 2C). The protective wall 23 reduces the direct application of fuel pressure fluctuations to the protrusions 30 and prevents the melting allowance resin r2 (see FIG. 4B) from flowing out into the main body 2. To prevent.

また、プラグ３の突起部３０よりさらに周縁部には、本体部２側に、例えば高さｈ＝０．１〜０．５［ｍｍ」程度突出した略円環状の当接部３２を備えている。その結果、突起部３０と当接部３２との間、詳細には突起部３０の第２の溶着部３１と当接部３２との間には、略円環状の溝３６（断面凹部）が形成される。
当接部３２は平坦な端面３３を有し、本体部２の端面２４とプラグ３の端面３３とが、互いに平行に対向して、図示しない超音波溶着装置に配置されている。従って、第２の溶着部３１の外壁面の断面は、突起部３０の端面３３に対して角度θ１で傾斜しており、さらに本体部２の端面２４に対して角度θ１で傾斜した状態で配置される。 Further, on the peripheral edge portion of the protrusion portion 30 of the plug 3, a substantially annular contact portion 32 projecting, for example, a height h = 0.1 to 0.5 [mm] is provided on the main body portion 2 side. There is. As a result, a substantially annular groove 36 (section recess) is formed between the protrusion 30 and the contact portion 32, specifically, between the second welded portion 31 of the protrusion 30 and the contact portion 32. It is formed.
The contact portion 32 has a flat end surface 33, and the end surface 24 of the main body portion 2 and the end surface 33 of the plug 3 face each other in parallel and are arranged in an ultrasonic welding device (not shown). Therefore, the cross section of the outer wall surface of the second welded portion 31 is arranged in a state of being inclined at an angle θ1 with respect to the end surface 33 of the protrusion 30 and further inclined at an angle θ1 with respect to the end surface 24 of the main body portion 2. Will be done.

図２（Ｂ）に示すように、本体部２の第１の溶着部２１とプラグ３の第２の溶着部３１とを接触させる。さらに、プラグ３の表面に超音波溶着装置のホーン９が押し当てられ、ホーン９からプラグ３に（例えば図中Ｙ方向に振動する）超音波振動が伝達される。このとき、本体部２は、（図示しない）超音波装置の固定治具１２（アンビル）に固定されている。
固定治具１２は、例えば本体部２の外縁部２０（フランジ部）を支持するように配置され、ステンレス等の金属材料から構成されている。 As shown in FIG. 2B, the first welded portion 21 of the main body portion 2 and the second welded portion 31 of the plug 3 are brought into contact with each other. Further, the horn 9 of the ultrasonic welding device is pressed against the surface of the plug 3, and the ultrasonic vibration (for example, vibrating in the Y direction in the drawing) is transmitted from the horn 9 to the plug 3. At this time, the main body 2 is fixed to the fixing jig 12 (anvil) of the ultrasonic device (not shown).
The fixing jig 12 is arranged so as to support the outer edge portion 20 (flange portion) of the main body portion 2, for example, and is made of a metal material such as stainless steel.

プラグ３が超音波振動することにより、第２の溶着部３１の平坦面がエッジを有する第１の溶着部２１に対して振動し、摩擦熱により第２の溶着部３１と第１の溶着部２１との接触箇所（溶着部）での樹脂が溶融する。エッジ部に振動を集中することで発熱を促進することができる。さらに、ホーン９は超音波振動しながらプラグ３を本体部２方向へと押圧するため、プラグ３は本体部２へと移動（下降）する。 When the plug 3 ultrasonically vibrates, the flat surface of the second welded portion 31 vibrates with respect to the first welded portion 21 having an edge, and the second welded portion 31 and the first welded portion due to frictional heat. The resin melts at the contact point (welded portion) with 21. Heat generation can be promoted by concentrating the vibration on the edge portion. Further, since the horn 9 presses the plug 3 in the direction of the main body 2 while ultrasonically vibrating, the plug 3 moves (descends) to the main body 2.

その後、図２（Ｃ）に示すように、ホーン９の超音波振動を停止するとともに、当接部３２の端面３３が本体部２の端面２４と接触する。第２の溶着部３１と第１の溶着部２１との接触箇所における樹脂の溶融が停止し、溶融した樹脂が固化してプラグ３と本体部２ととが接合部Ｊで溶着（接合）される。第２の溶着部３１の外壁面は端面３３（及び端面２４）に対して傾斜しているため、形成される接合部Ｊも端面３３（及び端面２４）に対して傾斜する。
樹脂が固化した後に、ホーン９は上昇し（図中Ｙ方向に移動し）、プラグ３から離隔する。 After that, as shown in FIG. 2C, the ultrasonic vibration of the horn 9 is stopped, and the end surface 33 of the contact portion 32 comes into contact with the end surface 24 of the main body portion 2. Melting of the resin at the contact point between the second welded portion 31 and the first welded portion 21 is stopped, the melted resin is solidified, and the plug 3 and the main body portion 2 are welded (bonded) at the joint portion J. To. Since the outer wall surface of the second welded portion 31 is inclined with respect to the end surface 33 (and the end surface 24), the formed joint portion J is also inclined with respect to the end surface 33 (and the end surface 24).
After the resin has solidified, the horn 9 rises (moves in the Y direction in the figure) and separates from the plug 3.

図２（Ｃ）に示すように、プラグ３の本体部２への移動は、当接部３２の端面３３と本体部２の端面２４との接触により停止する。すなわち、当接部３２の端面３３と本体部２の端面２４とが、Ｘ方向に平行な面で接触することで、プラグ３と本体部２とのＹ方向の相対位置関係が確定する。
このとき、当接部３２と第２の溶着部３１との間に間隙１０が形成される。また、本体部２の側壁部２２と突起部３０の側壁部３４（特に第２の溶着部３１の本体部２側への延長部３５の側壁部３４）との間にも間隙１１が形成されている。 As shown in FIG. 2C, the movement of the plug 3 to the main body portion 2 is stopped by the contact between the end surface 33 of the contact portion 32 and the end surface 24 of the main body portion 2. That is, when the end surface 33 of the contact portion 32 and the end surface 24 of the main body portion 2 come into contact with each other on a surface parallel to the X direction, the relative positional relationship between the plug 3 and the main body portion 2 in the Y direction is determined.
At this time, a gap 10 is formed between the contact portion 32 and the second welded portion 31. Further, a gap 11 is also formed between the side wall portion 22 of the main body portion 2 and the side wall portion 34 of the protrusion 30 (particularly, the side wall portion 34 of the extension portion 35 of the second welding portion 31 to the main body portion 2 side). ing.

図２（Ｃ）より明らかなように、当接部３２の存在によりプラグ３と本体部２との位置関係が確定されるため、接合部Ｊでのプラグ３と本体部２との接合面積は、突起部３０を形成する位置（内径ｄ１及び幅ｗ）と角度θ１、開口端部８の開口径ｄ２（側壁面２２の内径）及び当接部３２の高さｈ等の幾何学的パラメータにより設定することができる。そのため、接合部の強度設計が容易となり、必要な接合強度を再現性よく得ることができる。 As is clear from FIG. 2C, since the positional relationship between the plug 3 and the main body 2 is determined by the presence of the contact portion 32, the joint area between the plug 3 and the main body 2 at the joint J is determined. Depending on geometric parameters such as the position (inner diameter d1 and width w) and angle θ1 forming the protrusion 30, the opening diameter d2 (inner diameter of the side wall surface 22) of the opening end portion 8, and the height h of the contact portion 32. Can be set. Therefore, the strength design of the joint portion becomes easy, and the required joint strength can be obtained with good reproducibility.

図３は、超音波溶着の工程において、プラグ３の本体部２への沈み込み量（ｄ）の時間変化を示すグラフであり、縦軸は沈み込み量（変位）、横軸は時間を示す。図３（Ａ）はプラグ３が当接部３２を有しない場合、図３（Ｂ）はプラグ３が当接部３２を有する場合の沈み込み量の時間変化を示す。沈み込み量は、図２（Ｂ）に示すように、樹脂が溶融していない状態で第２の溶着部３１と第１の溶着部２１とが接触した位置をｄ＝０とし、プラグ３から本体部２に向かう方向（図中Ｙ方向）を正の方向としている。ホーン９からプラグ３に超音波振動の伝達を開始した時刻をｔ＝０とし、時刻ｔｅでホーン９に超音波振動を与える超音波振動子を停止する。従って、図３において、期間Ｔ１の間ホーン９はプラグ３に超音波振動を伝達する。
なお、理解のため図３のグラフは直線の折れ線グラフを示すが、これに限定するものではない。 FIG. 3 is a graph showing the time change of the subduction amount (d) of the plug 3 into the main body 2 in the ultrasonic welding process, where the vertical axis shows the subduction amount (displacement) and the horizontal axis shows the time. .. FIG. 3A shows the time change of the sinking amount when the plug 3 does not have the contact portion 32, and FIG. 3B shows the case where the plug 3 has the contact portion 32. As shown in FIG. 2B, the amount of subduction is set to the position where the second welded portion 31 and the first welded portion 21 are in contact with each other in a state where the resin is not melted, and d = 0. The direction toward the main body 2 (Y direction in the figure) is a positive direction. The time when the transmission of the ultrasonic vibration from the horn 9 to the plug 3 is started is set to t = 0, and the ultrasonic vibrator that gives the ultrasonic vibration to the horn 9 is stopped at the time te. Therefore, in FIG. 3, the horn 9 transmits ultrasonic vibration to the plug 3 during the period T1.
For understanding, the graph in FIG. 3 shows a straight line graph, but the graph is not limited to this.

プラグ３が当接部３２を有しない場合、図３（Ａ）のグラフの実線で示すように、時刻ｔ＝０からｔ＝ｔｅまでの期間Ｔ１の間、プラグ３は本体部２側に移動し（沈み込み）、その沈み込み量ｄが時間ともに増大し、時刻ｔ＝ｔｅにおいて沈み込み量はｄ＝ｄ１となる。時刻ｔ＝ｔｅにおいてホーン９への超音波振動エネルギーの供給が停止した後、第２の溶着部３１と第１の溶着部２１との接触部での溶融した樹脂が次第に凝固し、時刻ｔ＝ｔｓにおいて樹脂が固化し、時刻ｔ＝ｔｓにおいて沈み込み量はｄ＝ｄ２となる。しかし、時刻ｔ＝ｔｅからｔ＝ｔｓまでの間（期間Ｔ２の間）では沈み込み速度は低減する（グラフの傾きは徐々に緩やかになる）ものの、樹脂が完全に固化していないため、ホーン９に負荷される荷重によりプラグ３の本体部２への沈み込みは継続する。
その後、時刻ｔ＝ｔｓで樹脂が完全に固化した後は、プラグ３の本体部２への沈み込みが停止する。その後、時刻ｔ＝ｔｒで、ホーン９はプラグ３から離隔する。その結果、プラグ３と本体部２とが完全に溶着される。
期間Ｔ２の間は、プラグ３の本体部２への沈み込み量は制御が困難であり、ｄの値はばらつきが生じることがある。例えば図３（Ａ）のプラグ３の左右でｄの値が異なることがある。ｄの値のばらつきにより、予期せぬズレ変形や気泡の侵入が生じ、精度不良や気密不良のリスクが高くなることがある。その結果、製品の良品歩留まりの低下によるコストの増加を招くリスクが高くなる。 When the plug 3 does not have the contact portion 32, as shown by the solid line in the graph of FIG. 3A, the plug 3 moves to the main body portion 2 side during the period T1 from the time t = 0 to t = te. (Subduction), the amount of subduction d increases with time, and the amount of subduction becomes d = d1 at time t = te. After the supply of ultrasonic vibration energy to the horn 9 was stopped at time t = te, the molten resin at the contact portion between the second welded portion 31 and the first welded portion 21 gradually solidified, and at time t = te. The resin solidifies at ts, and the amount of subduction becomes d = d2 at time t = ts. However, although the sinking speed decreases from time t = te to t = ts (during period T2) (the slope of the graph gradually becomes gentle), the resin is not completely solidified, so the horn The sinking of the plug 3 into the main body 2 continues due to the load applied to 9.
After that, after the resin is completely solidified at time t = ts, the sinking of the plug 3 into the main body 2 is stopped. Then, at time t = tr, the horn 9 is separated from the plug 3. As a result, the plug 3 and the main body 2 are completely welded.
During the period T2, it is difficult to control the amount of the plug 3 subducting into the main body 2, and the value of d may vary. For example, the value of d may differ between the left and right of the plug 3 in FIG. 3 (A). Due to the variation in the value of d, unexpected displacement deformation and intrusion of air bubbles may occur, and the risk of poor accuracy and poor airtightness may increase. As a result, there is a high risk of increasing costs due to a decrease in the yield of non-defective products.

プラグ３が当接部３２を有する場合、図３（Ｂ）のグラフの実線で示すように、時刻ｔ＝０からｔ＝ｔｅまでの期間Ｔ１の間、プラグ３は本体部２に沈み込み、その沈み込み量ｄが時間ともに増大する。
時刻ｔ＝ｔｅでホーン９への超音波振動エネルギーの供給が停止し、当接部３２の端面３３と本体部２の端面２４とが接触する。時刻ｔ＝ｔｅでの沈み込み量ｄ＝ｄ０（＝ｄ１）となる。溶融した樹脂が次第に凝固する間（期間Ｔ２の間）においても、当接部３２の端面３３と本体部２の端面２４との接触により、プラグ３の本体部２への沈み込みが抑制され（沈み込み速度が実質的にゼロとなり）、沈み込み量ｄはｄ０を維持する。その後、時刻ｔ＝ｔｓで樹脂が完全に固化し、プラグ３と本体部２とが溶着される。
従って、プラグ３と本体部２とは、設計通りの相対的位置関係に固定され、予期せぬずれ変形等を抑制することができる。
また、樹脂が固化する過程で溶解した樹脂に圧力が加わると、溶解した樹脂と固化した樹脂との境界でずれや亀裂が入るリスクが高くなるが、当接部３２の存在によりホーン９による圧力が溶解した樹脂に加わることがなく良好な樹脂の接合が可能となる。
なお、当接部３２の高さｈとして、例えば図３（Ａ）において期間Ｔ２における沈み込み量ｄ（＝ｄ２−ｄ１）の値（又はその平均値）に設定することができる。 When the plug 3 has the contact portion 32, as shown by the solid line in the graph of FIG. 3B, the plug 3 sinks into the main body portion 2 during the period T1 from the time t = 0 to t = te. The amount of subduction d increases with time.
At time t = te, the supply of ultrasonic vibration energy to the horn 9 is stopped, and the end surface 33 of the contact portion 32 and the end surface 24 of the main body portion 2 come into contact with each other. The amount of subduction at time t = te is d = d0 (= d1). Even while the molten resin gradually solidifies (during the period T2), the contact between the end surface 33 of the contact portion 32 and the end surface 24 of the main body portion 2 suppresses the sinking of the plug 3 into the main body portion 2 (during the period T2). The subduction rate becomes substantially zero), and the subduction amount d maintains d0. Then, at time t = ts, the resin is completely solidified, and the plug 3 and the main body 2 are welded.
Therefore, the plug 3 and the main body 2 are fixed in a relative positional relationship as designed, and unexpected displacement deformation and the like can be suppressed.
Further, if pressure is applied to the melted resin in the process of solidifying the resin, there is a high risk of displacement or cracking at the boundary between the melted resin and the solidified resin, but the pressure due to the horn 9 due to the presence of the contact portion 32. Is not added to the dissolved resin, and good resin bonding is possible.
The height h of the contact portion 32 can be set to, for example, the value (or the average value thereof) of the subduction amount d (= d2-d1) in the period T2 in FIG. 3 (A).

なお、図３（Ｂ）のグラフの一点鎖線で示すように、本体部２及びプラグ３の製造上の有限の寸法ばらつき等を考慮し、当接部３２の端面３３と本体部２の端面２４とが接触する直前にホーン９への超音波振動エネルギーの供給を停止するよう制御してもよい。超音波振動エネルギーの供給停止後、（製造ばらつき等を考慮して設定される）僅かな距離δだけ沈み込み、時刻ｔ＝ｔｃで当接部３２の端面３３と本体部２の端面２４とが接触する。時刻ｔ＝ｔｃでの沈み込み量ｄ＝ｄ０＋δとなる。ただし、δは図３（Ａ）の期間Ｔ２の間での沈み込み量ｄ２−ｄ１より十分小さく（例えばδはｄ２−ｄ１の数分の１又は１桁以上小さく）、実質的に樹脂が固化する過程への影響はない。また、このような超音波振動の制御により、さらに確実に当接部３２の樹脂の溶融を防止し（僅かな溶融をも防止し）、当接部３２の高さｈで確定されるプラグ３と本体部２との相対位置関係を一層確実なものとしてもよい。 As shown by the alternate long and short dash line in the graph of FIG. 3B, the end surface 33 of the contact portion 32 and the end surface 24 of the main body portion 2 are taken into consideration in consideration of finite dimensional variation in manufacturing of the main body portion 2 and the plug 3. It may be controlled to stop the supply of the ultrasonic vibration energy to the horn 9 immediately before the contact with the horn 9. After the supply of ultrasonic vibration energy is stopped, it sinks by a small distance δ (set in consideration of manufacturing variations, etc.), and at time t = ct, the end face 33 of the contact portion 32 and the end face 24 of the main body portion 2 are brought into contact with each other. Contact. The amount of subduction at time t = tc is d = d0 + δ. However, δ is sufficiently smaller than the amount of subduction d2-d1 during the period T2 in FIG. 3 (A) (for example, δ is a fraction of d2-d1 or an order of magnitude smaller), and the resin is substantially solidified. There is no effect on the process of doing. Further, by controlling such ultrasonic vibration, the resin of the contact portion 32 is more reliably prevented from melting (even a slight melting is prevented), and the plug 3 is determined by the height h of the contact portion 32. The relative positional relationship between the main body portion 2 and the main body portion 2 may be made more reliable.

図４は、プラグ３と本体部２の開口端部の溶着箇所近傍の断面拡大図である。
図４（Ａ）に示すように、実使用状態では、プラグ３の本体部２側の壁面２５（主面部）には、図中黒矢印で示す方向に燃料の圧力が加わることになる。
プラグ３と本体部２との接合部Ｊは、当接部３２の端面３３より本体部２側に位置する。そのため、プラグ３の本体部２側の壁面に加えられた燃料の圧力は、接合部Ｊを支点として、当接部３２の端面３３が本体部２の端面２４を押圧する方向（図中白矢印方向）に作用する。当接部３２の端面３３は本体部２の端面２４に接しているため、プラグ３の変位及び剥離は効果的に防止される。また、脈動と呼ばれる断続的な燃料圧力変動が生じてもプラグ３の振動を軽減し、プラグ３と本体部２との溶着の耐久性の向上を容易に図ることができる。
このようなプラグ３と本体部２との単純な構成でありながら、本実施形態は、効果的に再現性よく高い接合強度を提供することが可能となる。 FIG. 4 is an enlarged cross-sectional view of the vicinity of the welded portion of the open end portion of the plug 3 and the main body portion 2.
As shown in FIG. 4A, in the actual use state, fuel pressure is applied to the wall surface 25 (main surface portion) on the main body 2 side of the plug 3 in the direction indicated by the black arrow in the figure.
The joint portion J between the plug 3 and the main body portion 2 is located on the main body portion 2 side with respect to the end surface 33 of the contact portion 32. Therefore, the pressure of the fuel applied to the wall surface on the main body 2 side of the plug 3 is in the direction in which the end face 33 of the contact portion 32 presses the end face 24 of the main body 2 with the joint J as a fulcrum (white arrow in the figure). It acts in the direction). Since the end surface 33 of the contact portion 32 is in contact with the end surface 24 of the main body portion 2, displacement and peeling of the plug 3 are effectively prevented. Further, even if an intermittent fuel pressure fluctuation called pulsation occurs, the vibration of the plug 3 can be reduced, and the durability of welding between the plug 3 and the main body 2 can be easily improved.
Despite the simple configuration of the plug 3 and the main body 2, the present embodiment can effectively provide high bonding strength with good reproducibility.

図４（Ｂ）に示すように、超音波溶着の際に、溶融した樹脂ｒ１、ｒ２が接合部Ｊから周囲に流れ拡がる。プラグ３側に流れ拡がった樹脂ｒ１は、当接部３２により堰き止められ、その結果樹脂ｒ１が外部に流出することが防止される。特に、当接部３２では樹脂の溶融が効果的に防止されるため、当接部３２による堰き止め効果は高い。
接合部Ｊでの溶融代の樹脂がバリとして押し出されると、残留応力の要因になるが、当接部３２により、樹脂のバリによる残留応力を抑制することができる。 As shown in FIG. 4B, during ultrasonic welding, the molten resins r1 and r2 flow from the joint portion J to the surroundings and spread. The resin r1 that has flowed to the plug 3 side is blocked by the contact portion 32, and as a result, the resin r1 is prevented from flowing out to the outside. In particular, since the contact portion 32 effectively prevents the resin from melting, the contact portion 32 has a high dampening effect.
When the resin of the melting allowance at the joint portion J is extruded as burrs, it causes residual stress, but the contact portion 32 can suppress the residual stress due to the resin burrs.

また、間隙１０内部で樹脂ｒ１が凝固し、プラグ３と本体部２とを接合する。このとき、プラグ３は、ホーン９により本体部２側へと押圧されて、プラグ３と本体部２とが密着した状態を維持する一方で、樹脂ｒ１は間隙１０内部で負荷が掛からず変位もない安定した状態で凝固することができる。その結果、プラグ３及び本体部２とを安定して、強固に接続する効果も得られる。
また、溶融した一部の樹脂ｒ２は、間隙１１側に流れ拡がり、突起部３０の側面と本体部２の側壁面２２とを接合する。 Further, the resin r1 solidifies inside the gap 10 to join the plug 3 and the main body 2. At this time, the plug 3 is pressed toward the main body 2 by the horn 9, and the plug 3 and the main body 2 are kept in close contact with each other, while the resin r1 is not loaded inside the gap 10 and is displaced. It can be solidified in a stable state. As a result, the effect of stably and firmly connecting the plug 3 and the main body 2 can be obtained.
Further, a part of the melted resin r2 flows and spreads toward the gap 11 side, and joins the side surface of the protrusion 30 and the side wall surface 22 of the main body 2.

（実施形態２）
図５は、プラグ３の突起部３０の形状の他の実施形態を示す拡大断面図である。
突起部３０は、特に第２の溶着部３１の本体部２側の延長部３５において、本体部２の側壁面２２に対向する側壁面３４を備え、側壁面３４はＸ方向に対して（当接部３２の端面３３及び本体部２の端面２４に対して）所定の角度θ２の傾斜角を有しており、また本体部２の側壁面２２（詳細には、第１の溶着部２１に繋がり本体部２の開口端部と反対側に延びる内壁面）に対しては角度π／２−θ２の傾斜角を有する。
実施形態１においては、側壁面３４と側壁面２２とは平行になるよう設定されているが、実施形態２においては、本体部２の長尺方向（図中Ｙ方向）に対して角度π／２−θ２の傾斜角を有する。そのため、側壁面３４と側壁面２２との距離は、突起部３０の先端ほど長くなる。 (Embodiment 2)
FIG. 5 is an enlarged cross-sectional view showing another embodiment of the shape of the protrusion 30 of the plug 3.
The protrusion 30 is provided with a side wall surface 34 facing the side wall surface 22 of the main body 2, particularly in the extension portion 35 on the main body 2 side of the second welded portion 31, and the side wall surface 34 is oriented in the X direction (this). It has an inclination angle of a predetermined angle θ2 (with respect to the end surface 33 of the contact portion 32 and the end surface 24 of the main body portion 2), and also has a side wall surface 22 of the main body portion 2 (specifically, on the first welded portion 21). It has an inclination angle of angle π / 2-θ2 with respect to the inner wall surface extending on the side opposite to the opening end portion of the connecting main body portion 2.
In the first embodiment, the side wall surface 34 and the side wall surface 22 are set to be parallel to each other, but in the second embodiment, the angle π / with respect to the long direction (Y direction in the figure) of the main body portion 2. It has an inclination angle of 2-θ2. Therefore, the distance between the side wall surface 34 and the side wall surface 22 becomes longer toward the tip of the protrusion 30.

プラグ３は、ホーン９により超音波振動を印加されながら押圧されるため、接合部Ｊで溶融した樹脂の一部は間隙１１に流れる。一方、間隙１１は突起部３０の先端ほど広くなっているため、実施形態１と比較して、樹脂ｒ２はスムーズに突起部３０の先端へと流れ拡がることができる。
すなわち、間隙１１において接合部Ｊ近傍での樹脂による接合を確保するとともに、間隙１１での樹脂の流動の抵抗を低減することが可能となる。 Since the plug 3 is pressed by the horn 9 while applying ultrasonic vibration, a part of the resin melted at the joint portion J flows into the gap 11. On the other hand, since the gap 11 is wider as the tip of the protrusion 30, the resin r2 can smoothly flow and spread to the tip of the protrusion 30 as compared with the first embodiment.
That is, it is possible to secure the bonding by the resin in the vicinity of the bonding portion J in the gap 11 and reduce the resistance of the resin flow in the gap 11.

また、角度θ２を調整することで、樹脂ｒ２を収容する間隙１１の容積を調整することができる。角度θ１とともに角度θ２を調整することで、溶融した状態で樹脂の間隙１０、接合部Ｊ及び間隙１１での流動を調整し、樹脂ｒ１と樹脂ｒ２の樹脂の配分の調整がさらに容易となる。 Further, by adjusting the angle θ2, the volume of the gap 11 accommodating the resin r2 can be adjusted. By adjusting the angle θ2 together with the angle θ1, the flow of the resin in the gap 10, the joint portion J, and the gap 11 in the molten state is adjusted, and the distribution of the resin between the resin r1 and the resin r2 can be further easily adjusted.

本発明に係るデリバリパイプによれば、樹脂製の燃料デリバリパイプ本体の開口端部とプラグとを液密に高い強度で安定して接合することが容易となり、産業上の利用可能性は高い。 According to the delivery pipe according to the present invention, it becomes easy to stably join the open end of the resin fuel delivery pipe main body and the plug in a liquid-tight manner with high strength, and the industrial applicability is high.

１デリバリパイプ
２本体部
３プラグ
４接続口
５固定具
６パイプ
７先端部
８開口端部
９ホーン
１０間隙
１１間隙
２０外縁部（フランジ部）
２１第１の溶着部（本体側溶着部）
２２側壁面（内壁面）
２３保護壁
２４端面
２５壁面
３０突起部
３１第２の溶着部（プラグ側溶着部）
３２当接部
３３端面
３４側壁部
３５延長部
３６溝（凹部） 1 Delivery pipe 2 Main body 3 Plug 4 Connection port 5 Fixture 6 Pipe 7 Tip 8 Open end 9 Horn 10 Gap 11 Gap 20 Outer edge (flange)
21 First welded part (welded part on the main body side)
22 Side wall surface (inner wall surface)
23 Protective wall 24 End face 25 Wall surface 30 Projection 31 Second welded part (plug side welded part)
32 Contact part 33 End face 34 Side wall part 35 Extension part 36 Groove (recess)

Claims

A cylindrical main body portion (2) having an open end portion (8) and a plug (3) for closing the open end portion (8) are provided.
The main body portion (2) and the plug (3) are joined by only one joint portion (J).
The main body portion (2) has an outer edge portion (20) at the open end portion (8), and the outer edge portion (20) has a first welded portion (21).
The plug (3), the projecting portion on the inner peripheral side than the first weld portion (21) (30), have a contact portion (32) on the outer peripheral side of the first weld portion (21) death,
The protrusion (30) has a second welded portion (31) that is inclined with respect to the end surface (33) of the contact portion (32).
The joint portion (J) is located on the main body portion (2) side of the end surface (33) of the contact portion (32).
At the joint portion (J), the first welded portion (21) and the second welded portion (31) are welded.
A delivery pipe characterized in that the end surface (24) of the open end portion (8) and the end surface (33) of the contact portion (32) are in contact with each other in a non-melted state.

The plug (3) has a groove (36) between the second welded portion (31) and the abutting portion (32).
The first aspect of claim 1, wherein the first resin accommodating portion (10) of the molten resin is composed of the groove (36) and the end face (24) facing the groove (36) . Delivery pipe.

The groove (36) has a flat bottom surface and has a flat bottom surface.
The delivery pipe according to claim 2, wherein the end face (24) facing the groove (36) is flat.

The said in the extension portion (35) of the inner wall surface (22) connected to the first welded portion (21) and the protruding portion (30) to the main body portion (2) side of the second welded portion (31). The one according to any one of claims 1 to 3, wherein the second resin accommodating portion (11) of the molten resin is provided, which is composed of the inner wall surface (22) and the side wall portion (34) facing the inner wall surface (22). Delivery pipe.

The side wall portion (34) is inclined with respect to the inner wall surface (22) connected to the first welding portion (21), and the side wall surface (34) and the inner wall surface (22) of the extension portion (35). The delivery pipe according to claim 4 , wherein the distance from the protrusion (30) becomes longer toward the tip of the protrusion (30).