JP2006194233A - Joint structure of diverging branch pipe in fuel rail for internal combustion engine, diverging branch pipe and manufacturing method of diverging branch pipe - Google Patents

Joint structure of diverging branch pipe in fuel rail for internal combustion engine, diverging branch pipe and manufacturing method of diverging branch pipe Download PDF

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JP2006194233A
JP2006194233A JP2005157023A JP2005157023A JP2006194233A JP 2006194233 A JP2006194233 A JP 2006194233A JP 2005157023 A JP2005157023 A JP 2005157023A JP 2005157023 A JP2005157023 A JP 2005157023A JP 2006194233 A JP2006194233 A JP 2006194233A
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pipe
branch
branch pipe
internal combustion
tube
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JP4433306B2 (en
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Masayoshi Usui
正佳 臼井
Kikuo Asada
菊雄 浅田
Yasuaki Hashimoto
康明 橋本
Hiroyuki Nishizawa
洋行 西澤
Iichiro Kiyono
威一郎 清野
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Usui Kokusai Sangyo Kaisha Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure of a diverging branch pipe in a fuel rail for an internal combustion engine preventing corrosion of component parts such as the fuel rail and the diverging branch pipe and preventing oxidation and deterioration of fuel. <P>SOLUTION: The joint structure of the diverging branch pipe in the fuel rail for the internal combustion engine connects the fuel rail for the internal combustion engine, which is made of stainless steel or made of steel with a rustproof treatment on at least an inner surface, and the diverging branch pipe, which comprises a double pipe composed of an outer pipe and an inner pipe with its inner peripheral surface more excellent in rustproof ability with respect to the fuel than an outer peripheral surface of the outer pipe, by a fastening nut through a joint fitting. A connection seal portion of the diverging branch pipe and the joint fitting has rustproof ability equal to the inner peripheral surface of the diverging branch pipe and an entire liquid contact portion including a seal surface of the diverging branch pipe with respect to the fuel pipe is covered with the inner pipe. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、内燃機関用燃料レールにおける分岐枝管の継手構造とその製造方法に係り、より詳しくは直接筒内噴射式ガソリンエンジン用または吸気管内噴射式ガソリンエンジン用燃料レール(デリバリーパイプ)あるいはディーゼルエンジン用燃料レールにおける分岐枝管の継手構造と分岐枝管およびその分岐枝管の製造方法に関するものである。   The present invention relates to a joint structure of a branch branch pipe in a fuel rail for an internal combustion engine and a manufacturing method thereof, and more specifically, a fuel rail (delivery pipe) or diesel for a direct cylinder injection gasoline engine or an intake pipe injection gasoline engine. The present invention relates to a joint structure of a branch branch pipe in a fuel rail for an engine, a branch branch pipe, and a method of manufacturing the branch branch pipe.

内燃機関用燃料レールにおける分岐枝管の継手構造として、レール本体の周壁部に設けた当該流通路に通ずる貫孔に継手金具(ニップル)を嵌挿した状態をもって相互に接合(ろう着等)し、該継手金具に分岐枝管をナットにより締付けて接続構成したものがある(特許文献1参照)。このような構造の直噴ガソリンエンジン用燃料レールにおける分岐枝管の継手においては、燃料の酸化による腐食を防止するため、燃料レールや分岐枝管の少なくとも内周面にニッケルめっきを施し、鉄素地あるいはろう着用銅めっき皮膜や銅ろう材の表面を被覆することが行われている。しかるに、前記した構造の継手構造において、燃料(ガソリン)は、流通路での鉄素地、あるいは銅めっき皮膜や銅ろう材表面への直接の接触によって酸化作用を受けて酸化し、酸化により腐食性の高くなったサワーガソリンが構成部品の鉄素地あるいはアルミニウム表面を腐食するため、製品全体に無電解ニッケルめっきを施し、レールおよび分岐継手の内周面にニッケルめっき皮膜を設けることが行われている。さらに、大気汚染防止の観点から、前記無電解ニッケルめっきに代えて、銅ろう着後化学錫めっきを施す方法も知られている(特許文献2参照)。また、燃料レールの内外面にNiまたはNi基合金めっき皮膜を形成したものや、分岐枝管を二重管とし、その内管側にSUS管或いは内面NiまたはNi基の合金めっき管を用い、その内面をNi基の合金めっき管として、Ni、Co、およびこれらを基とする合金のうち、1種類のめっき層を第1めっき層として形成し、この第1めっき層上に前記第1めっき層形成金属又はこれらを基とする合金より低融点の単金属あるいは合金層を第2めっき層として形成
し、この2層のめっき層を形成した帯鋼板を使用して電縫造管し、次いで加熱処理することによって鋼素地が露出している部分がないような溶接管(特許文献3、4参照)を使用したものが知られている。
特開2003−278623号公報 特開平11−117826号公報 特開平5−9786号公報 特開平5−156494号公報
As a joint structure of a branch branch pipe in a fuel rail for an internal combustion engine, a joint fitting (a nipple) is inserted into a through hole communicating with the flow passage provided in the peripheral wall portion of the rail body, and then joined (brazed or the like) to each other. There is one in which a branch branch pipe is tightened with a nut and connected to the joint fitting (see Patent Document 1). In order to prevent corrosion due to oxidation of the fuel in the joint of the fuel rail for a direct injection gasoline engine having such a structure, nickel plating is applied to at least the inner peripheral surface of the fuel rail and the branch branch pipe, thereby Alternatively, a copper plating film for brazing or a surface of a copper brazing material is coated. However, in the joint structure having the structure described above, the fuel (gasoline) is oxidized and oxidized by direct contact with the iron substrate in the flow passage or the surface of the copper plating film or the copper brazing material. Since sour gasoline with high corrosion corrodes the iron base or aluminum surface of the component parts, electroless nickel plating is applied to the entire product, and a nickel plating film is provided on the inner peripheral surface of the rail and branch joint . Furthermore, from the viewpoint of preventing air pollution, a method of performing chemical tin plating after copper brazing instead of the electroless nickel plating is also known (see Patent Document 2). Also, Ni or Ni-based alloy plating film is formed on the inner and outer surfaces of the fuel rail, and the branch branch pipe is a double pipe, and an SUS pipe or an inner surface Ni or Ni-based alloy plating pipe is used on the inner pipe side, The inner surface is made of an Ni-based alloy plating tube, and one kind of plating layer is formed as a first plating layer among Ni, Co, and alloys based thereon, and the first plating layer is formed on the first plating layer. A single metal or alloy layer having a melting point lower than that of the layer-forming metal or an alloy based on these is formed as the second plating layer, and an electro-sewing tube is formed using the strip steel plate on which the two plating layers are formed. The thing using the welded pipe (refer patent documents 3 and 4) which does not have the part which the steel base is exposed by heat-processing is known.
JP 2003-278623 A Japanese Patent Laid-Open No. 11-117826 JP-A-5-9786 JP-A-5-156494

しかしながら、前記した従来の継手構造は、分岐枝管と継手金具の接続シール部にSUSあるいはNiやNi基合金めっきの存在しない接液部(燃料と接触する部分)が生じ、燃料の酸化作用が促進され、サワーガソリン化が加速され、燃料レールや分岐枝管等の構成部品の鉄素地あるいはアルミニウム表面を腐食させること、また、排気ガス対策としてバイオ燃料等の含有量の増加により鉄への腐食性が増していることに加え、燃料の噴射圧が15〜200MPaに高くなるにつれて燃料温度が上昇し、燃料の分解と腐食性がより高くなり、前記接液部がたとえ狭隘な部分であったとしても錆の発生が大きな問題となり、さらに、噴射圧の高圧化に伴いナットの締付け力が高くなり、数回の配管の取外しにより本管レールや分岐枝管に施されているめっき皮膜の剥離が発生し、その剥離粉が噴射弁のシート面等に付着して燃料の噴射に異常をきたす危惧があるという未解決な課題が残されていた。   However, in the above-described conventional joint structure, a liquid contact portion (a portion that comes into contact with fuel) where SUS or Ni or Ni-based alloy plating does not exist is generated in the connection seal portion between the branch branch pipe and the joint fitting, and the oxidation action of the fuel occurs. Accelerated, sour gasoline conversion, corrodes the iron base or aluminum surface of components such as fuel rails and branch pipes, and corrodes to iron by increasing the content of biofuel etc. as an exhaust gas countermeasure As the fuel injection pressure increases to 15 to 200 MPa, the fuel temperature rises, the fuel decomposes and becomes more corrosive, and the wetted part is a narrow part. However, the occurrence of rust becomes a major problem, and the tightening force of the nut increases as the injection pressure increases, and it is applied to the main rail and branch branch pipe by removing the pipe several times. And peeling of the plating film occurs have its peel powder is unresolved problem that adheres to the sheet surface or the like of the injection valve is fear of causing the abnormal fuel injection were left.

本発明は、かかる課題を解決するためになされたもので、燃料レールや分岐枝管等の構成部品の腐食を防止し、かつ接続シール面における気密の維持が強固に確保され、燃料の酸化や劣化を防止し得る内燃機関用燃料レールにおける分岐枝管の継手構造と分岐枝管および該分岐枝管の製造方法を提案しようとするものである。   The present invention has been made to solve such a problem, and prevents corrosion of components such as a fuel rail and a branch branch pipe, and firmly maintains airtightness in the connection seal surface, and thereby oxidizes the fuel. An object of the present invention is to propose a joint structure of a branch branch pipe, a branch branch pipe, and a method of manufacturing the branch branch pipe in a fuel rail for an internal combustion engine that can prevent deterioration.

上記課題を解決するための本発明に係る内燃機関用燃料レールにおける分岐枝管の継手構造は、ステンレス鋼製もしくは少なくとも内面に防錆処理が施された鋼製の内燃機関用燃料レールと、外管とその内周面が該外管の外周面より燃料に対する防錆能が優れた内管とからなる二重管で構成された分岐枝管とを、継手金具を介して締結用ナットにより接続構成してなる継手構造において、前記分岐枝管と継手金具の接続シール部が、当該分岐枝管内周面と同等の防錆能を有すると共に、該分岐枝管の燃料に対するシール面を含む接液部分の全てが前記内管によって覆われ、該シール面を含む内管の受圧部を前記外管によって支持するよう構成されていることを特徴とするものである。   In order to solve the above problems, the joint structure of the branch branch pipe in the fuel rail for an internal combustion engine according to the present invention includes a fuel rail for an internal combustion engine made of stainless steel or steel having at least an inner surface subjected to rust prevention, A branch branch pipe composed of a double pipe consisting of a pipe and an inner pipe whose inner peripheral surface is more rust-proof against fuel than the outer peripheral surface of the outer pipe is connected by a fastening nut through a fitting. In the joint structure formed, the connection seal portion between the branch branch pipe and the joint fitting has a rust preventive ability equivalent to the inner peripheral surface of the branch branch pipe, and the liquid contact portion includes a seal surface for the fuel of the branch branch pipe All of the portion is covered with the inner tube, and the pressure receiving portion of the inner tube including the sealing surface is configured to be supported by the outer tube.

また、本発明に係る上記分岐枝管の継手構造において、前記継手金具の接続シール部を、該継手金具の分岐孔軸に直角な平坦面を有する断面凹形状とし、前記外管の開口端面を前記内管の開口端部で覆うようにして折り曲げ、該内管の内周面がシート面となるように形成した分岐枝管を、予め該分岐枝管に組込んだ締結用ナットにより、接続構成したことを特徴とするものである。   Moreover, in the joint structure of the branch branch pipe according to the present invention, the connection seal portion of the joint fitting has a concave cross section having a flat surface perpendicular to the branch hole axis of the joint fitting, and the opening end face of the outer pipe is The branch branch pipe that is bent so as to cover the opening end of the inner pipe and the inner peripheral surface of the inner pipe is a sheet surface is connected by a fastening nut that is incorporated in the branch branch pipe in advance. It is characterized by comprising.

本発明に係る上記分岐枝管の接続構造において、前記継手金具の接続シール部と分岐枝管のシート面との間にガスケットを介在させ、予め該分岐枝管に組込んだ前記締結用ナットにより、接続構成したことを特徴とするものである。   In the branch branch pipe connection structure according to the present invention, a gasket is interposed between the connection seal portion of the joint fitting and the seat surface of the branch branch pipe, and the fastening nut incorporated in the branch branch pipe in advance. The connection configuration is characterized.

また、本発明に係る上記分岐枝管の接続構造において、前記分岐枝管の端末にスプールまたは突起を設け、締結用ナットの受圧部としたことを特徴とするものである。   The branch branch pipe connection structure according to the present invention is characterized in that a spool or a protrusion is provided at a terminal of the branch branch pipe to form a pressure receiving portion of a fastening nut.

本発明による内燃機関用燃料レールにおける分岐枝管の継手構造は、前記継手金具の接続シール部を円錐凸形状とし、前記分岐枝管のシート面をシングルフレアー形状とし、該円錐凸形状の接続シール部と該シングルフレアー形状のシート面との間にリング状円錐ガスケットを介在させ、予め分岐枝管に組込んだ締結用ナットにより、接続構成したことを特徴とするものである。   In the joint structure of the branch branch pipe in the fuel rail for an internal combustion engine according to the present invention, the connection seal portion of the joint fitting has a conical convex shape, the seat surface of the branch branch pipe has a single flare shape, and the conical convex connection seal. A ring-shaped conical gasket is interposed between the portion and the single-flare-shaped sheet surface, and the connection is configured by a fastening nut incorporated in advance in the branch branch pipe.

また、本発明に係る上記分岐枝管の接続構造において、前記継手金具の接続シール部を円錐凹形状とし、前記分岐枝管のシート面をシングルフレアー形状とし、前記円錐凹形状の接続シール部と前記シングルフレアー形状のシート面との間に算盤玉形ガスケットを介在させ、予め分岐枝管に組込んだ締結用ナットにより、接続構成したことを特徴とするものである。   Further, in the branch branch pipe connection structure according to the present invention, the connection seal portion of the joint fitting has a conical concave shape, the seat surface of the branch branch pipe has a single flare shape, and the conical concave shape connection seal portion; An abacus bead gasket is interposed between the single flare-shaped sheet surface, and a connection nut is formed by a fastening nut incorporated in advance in the branch branch pipe.

本発明による内燃機関用燃料レールにおける分岐枝管の継手構造は、前記継手金具の接続シール部に、分岐孔の軸芯に対する傾斜角αを有する凹状のテーパーを形成し、前記分岐枝管の外管の接続頭部を、前記継手金具の接続シール部における傾斜角αを有する凹状のテーパー面に対応して、傾斜角α±5°を有する凸状のテーパー壁を有する形状とし、該凸状のテーパー壁を有する外管の接続頭部を覆うように内管の先端を外側に折り曲げてリング状のシート面を形成し、該シート面と前記継手金具のテーパー面との間に略リング形状の円錐ガスケットを介在させ、予め前記分岐枝管に組込んだ締結用ナットにより、接続構成したことを特徴とするものである。   In the joint structure of the branch branch pipe in the fuel rail for an internal combustion engine according to the present invention, a concave taper having an inclination angle α with respect to the axial center of the branch hole is formed in the connection seal portion of the joint fitting, and the outside of the branch branch pipe is formed. The connection head of the tube has a shape having a convex tapered wall having an inclination angle α ± 5 ° corresponding to the concave taper surface having the inclination angle α in the connection seal portion of the fitting. A ring-shaped seat surface is formed by bending the tip of the inner tube outward so as to cover the connection head of the outer tube having a tapered wall, and a substantially ring shape is formed between the seat surface and the tapered surface of the fitting. The conical gasket is interposed, and a connection nut is used for the connection by a fastening nut incorporated in the branch branch pipe in advance.

本発明に係る上記分岐枝管の継手構造において、前記傾斜角αが前記継手金具の分岐孔の軸心に対して50〜120°であることを特徴とするものである。   In the joint structure of the branch branch pipe according to the present invention, the inclination angle α is 50 to 120 ° with respect to the axis of the branch hole of the joint fitting.

また、本発明に係る上記分岐枝管の継手構造は、前記分岐枝管の接続頭部の先端形状が、該分岐枝管の軸心に対してほぼ直角に形成され、該接続頭部を覆う内管のシート面が、折り返し二重構造のテーパー壁面に形成されることを特徴とするものである。   In the joint structure of the branch branch pipe according to the present invention, the tip shape of the connection head of the branch branch pipe is formed substantially at right angles to the axis of the branch branch pipe and covers the connection head. The sheet surface of the inner tube is formed on a tapered wall surface of a folded double structure.

本発明に係る内燃機関用燃料レールにおける分岐枝管の継手構造は、ステンレス鋼製もしくは少なくとも内面に防錆処理が施された鋼製の内燃機関用燃料レールと、外管とその内周面が外管の外周面より燃料に対する防錆能が優れた内管とからなる二重管で構成された分岐枝管とを、継手金具を介して締結用ナットにより接続構成してなる継手構造において、前記継手金具の接続シール部が平坦面となし、前記分岐枝管の端末部に拡径部を設けてその外周面に受圧部を形成し、それに連なる接続頭部のシート面と、前記継手金具の平坦面との間にガスケットを介在させ、予め分岐枝管側に組込んだワッシャに形成した押圧座面部を、前記分岐枝管の拡径部の外周面に形成された受圧部に当接係合させ、締結用ナットにより接続構成したことを特徴とするものである。   The joint structure of the branch branch pipe in the fuel rail for an internal combustion engine according to the present invention includes a fuel rail for an internal combustion engine made of stainless steel or at least an inner surface subjected to rust prevention treatment, an outer pipe, and an inner peripheral surface thereof. In the joint structure formed by connecting the branch branch pipe composed of the double pipe composed of the inner pipe excellent in the antirust performance against the fuel from the outer peripheral surface of the outer pipe with the fastening nut through the joint fitting, The connection seal portion of the joint fitting is a flat surface, a diameter-enlarged portion is provided at the end portion of the branch branch pipe, a pressure receiving portion is formed on the outer peripheral surface thereof, a seating surface of the connection head connected thereto, and the joint fitting The pressure seat surface part formed in the washer previously incorporated in the branch branch pipe side is brought into contact with the pressure receiving part formed on the outer peripheral surface of the enlarged diameter part of the branch branch pipe. It is engaged and connected with the fastening nut. It is an butterfly.

また、本発明に係る内燃機関用燃料レールにおける分岐枝管の継手構造は、ステンレス鋼製もしくは少なくとも内面に防錆処理が施された鋼製の内燃機関用燃料レールと、接続端部に相手座部への押圧面となす截頭円錐状、もしくは円弧状あるいは算盤珠状の接続頭部を有し、かつ軸芯内部の流通孔の孔周面全長にわたって薄肉からなるステンレス製の内管を密嵌状に内装して形成してなる分岐枝管とを、継手金具を介して締結用ナットにより接続構成してなる継手構造において、前記接続頭部の先端部を覆うように前記ステンレス製の内管の先端部を外側に折り曲げてシート面を形成し、該シート面と前記継手金具の受圧面とを当接係合させ、締結用ナットにより接続構成したことを特徴とするものである。   Further, the joint structure of the branch branch pipe in the fuel rail for an internal combustion engine according to the present invention includes a fuel rail for an internal combustion engine made of stainless steel or at least an inner surface subjected to rust prevention treatment, and a mating seat at a connection end. A stainless steel inner tube that has a frustoconical, arc-shaped, or abacus-shaped connecting head that serves as a pressing surface to the part and that is thin over the entire circumference of the circulation hole inside the shaft core In a joint structure formed by connecting a branch branch pipe formed by fitting into a fitting nut with a fastening nut via a joint fitting, the inner part made of stainless steel so as to cover the tip of the connection head A tube surface is bent outward to form a sheet surface, the sheet surface and the pressure receiving surface of the joint fitting are brought into contact with each other, and connected by a fastening nut.

さらに、前記継手構造において、接続頭部の先端部を覆うステンレス製の内管の外側折り曲げ部は、当該接続頭部の先端部と面一となるように当該接続頭部に埋設してシート面を形成したことを特徴とするものである。   Further, in the joint structure, the outer bent portion of the stainless steel inner tube covering the tip of the connection head is embedded in the connection head so as to be flush with the tip of the connection head. Is formed.

本発明に係る内燃機関用燃料レールにおける分岐枝管は、外管と内管との二重管で構成され、該内管がステンレス鋼管または内周面に防錆皮膜が施された管体からなり、該内管の内周面がシート面となるように外管の開口端面を内管開口端部で覆った構造となし、燃料に対するシール面を含む接液部分の全てが前記内管によって覆われ、かつ該内管の受圧部が前記外管によって支持され、さらに端末部に締結用ナットの受圧部としてのスプールまたは突起が設けられることを特徴とするとする、内燃機関用燃料レールにおける分岐枝管を要旨とするものである。   The branch branch pipe in the fuel rail for an internal combustion engine according to the present invention is composed of a double pipe of an outer pipe and an inner pipe, and the inner pipe is made of a stainless steel pipe or a pipe body having a rust-proof coating on the inner peripheral surface. The inner pipe has a structure in which the opening end face of the outer pipe is covered with the inner pipe opening end so that the inner peripheral surface of the inner pipe becomes a seat surface, and all the wetted parts including the sealing surface for the fuel are formed by the inner pipe. A branch in an internal combustion engine fuel rail, characterized in that it is covered and a pressure receiving portion of the inner tube is supported by the outer tube, and a spool or a projection as a pressure receiving portion of a fastening nut is provided at a terminal portion. It is a branch pipe.

上記本発明に係る分岐枝管は、前記内管の防錆皮膜が、Niめっき皮膜もしくはNi基合金皮膜、またはNiめっき皮膜とNi−P合金めっき皮膜の複層もしくは拡散した単層の皮膜で構成されていることを特徴とするものである。   In the branched branch pipe according to the present invention, the anticorrosive film of the inner pipe is a Ni plating film or a Ni-based alloy film, or a multilayer of Ni plating film and Ni-P alloy plating film or a diffused single layer film. It is characterized by being comprised.

本発明はさらに、外管と内管とからなる二重管の当該外管、内管の両方を同時に管軸方向にパンチで押し込むことにより、ナットの受圧部としてのスプールまたは突起を外管と内管で形成し、次いで接続端部側の外管の管端部を切除して内管の管端部を突出させ、しかる後、当該内管の前記突出部を外側に折り曲げて外管の接続端部側管端面を覆うと共に、該内管の内周面でシート面を形成することを特徴とする、内燃機関用燃料レールにおける分岐枝管の製造方法を要旨とするものである。   The present invention further provides a spool or protrusion as a pressure receiving portion of the nut as the outer tube by simultaneously pressing both the outer tube and the inner tube of the double tube composed of the outer tube and the inner tube with a punch in the tube axis direction. Then, the tube end of the outer tube on the connection end side is cut off to project the tube end of the inner tube, and then the projecting portion of the inner tube is bent outward to The gist of the present invention is a method for manufacturing a branch branch pipe in a fuel rail for an internal combustion engine, which covers a connecting end side pipe end face and forms a seat surface on an inner peripheral face of the inner pipe.

本発明に係る上記分岐枝管の製造方法において、外管と内管とからなる二重管の当該外管のみを管軸方向にパンチで押し込むことにより、締結用ナットの受圧部としてのスプールまたは突起を外管のみで形成し、次いで該外管の接続側管端より突出している内管の突出部を外側に拡径しながら折り曲げ、該外管の接続側管端面を覆うと共に、該内管の内周面でシート面を形成することを特徴とするものである。   In the above branch branch pipe manufacturing method according to the present invention, a spool as a pressure receiving part of a fastening nut is formed by pressing only the outer pipe of the double pipe composed of the outer pipe and the inner pipe with a punch in the pipe axis direction. The protrusion is formed only by the outer tube, and then the inner tube projecting from the connection side tube end of the outer tube is bent outwardly to cover the connection side tube end surface of the outer tube, The sheet surface is formed on the inner peripheral surface of the tube.

また、本発明に係る上記分岐枝管の製造方法において、外管と内管とからなる二重管の当該外管のみを管軸方向にパンチで押し込むことにより、締結用ナットの受圧部としてのスプールまたは突起を外管のみで形成し、前記外管の接続頭部を前記継手金具の接続シール部に形成される傾斜角αの凹状のテーパー面に対応して、同様の傾斜角に加工することにより傾斜角αのテーパー壁を有する接続頭部を形成し、次いで外管の接続側管端より突出している内管の突出部を外側に拡径しながら折り曲げ、該外管の接続側管端面を覆うと共に該内管の内周面で、角度α±5°の凸状のテーパー壁を有するシート面を形成することを特徴とするものである。   Further, in the above branch branch pipe manufacturing method according to the present invention, only the outer pipe of the double pipe composed of the outer pipe and the inner pipe is punched in the pipe axial direction as a pressure receiving portion of the fastening nut. The spool or protrusion is formed only by the outer tube, and the connection head of the outer tube is processed to have the same inclination angle corresponding to the concave tapered surface of the inclination angle α formed on the connection seal portion of the fitting. To form a connection head having a taper wall with an inclination angle α, and then bend the outer tube protruding from the connection side tube end of the outer tube while expanding the diameter outward, thereby connecting the outer tube to the connection side tube. A sheet surface having a convex tapered wall with an angle α ± 5 ° is formed on the inner peripheral surface of the inner tube while covering the end surface.

本発明における上記分岐枝管の製造方法において、前記傾斜角αが前記継手金具の分岐孔の軸心に対して50〜120°であることを特徴とするものである。   In the method for manufacturing a branched branch pipe according to the present invention, the inclination angle α is 50 to 120 ° with respect to the axis of the branch hole of the joint fitting.

さらに、本発明に係る上記分岐枝管の製造方法において、前記外管の接続頭部に形成される傾斜角αのテーパー壁が、機械的手段による切削によって形成されることを好ましい態様とするものである。 Furthermore, in the method for manufacturing a branch branch pipe according to the present invention, it is preferable that the tapered wall having the inclination angle α formed at the connection head portion of the outer pipe is formed by cutting by mechanical means. It is.

本発明に係る上記内燃機関用燃料レールにおける分岐枝管の製造方法において、前記外管の接続頭部が分岐枝管の管軸に対してほぼ直角に形成され、該外管の接続頭部を覆う内管が、折り返し二重構造のテーパー壁面に形成されることを特徴とするものである。   In the method of manufacturing a branch branch pipe in the fuel rail for an internal combustion engine according to the present invention, the connection head of the outer pipe is formed substantially perpendicular to the pipe axis of the branch branch pipe, and the connection head of the outer pipe is The covering inner tube is formed on a tapered wall surface of a folded double structure.

本発明はまた、接続端部に相手座部への押圧面となす截頭円錐状、もしくは円弧状あるいは算盤珠状の接続頭部を有し、かつ軸芯内部の流通孔の孔周面全長にわたって薄肉からなるステンレス製の内管を密嵌状に内装し、前記接続頭部の先端部を覆うように前記ステンレス製の内管の先端部を外側に折り曲げてシート面を形成してなる分岐枝管の製造方法であって、軸芯内部の流通孔の孔周面全長にわたって薄肉からなるステンレス製の内管を密嵌状に内装した管体の外管のみを管軸方向にパンチで押し込むことにより前記接続頭部を成形すると同時に前記内管を突出させ、次いで外管の接続側管端より突出している前記内管の突出部を外側に拡径しながら折り曲げ、該外管の接続頭部の先端部を覆うと共に該内管の内周面でシート面を形成することを特徴とする内燃機関用燃料レールにおける分岐枝管の製造方法を要旨とするものである。なお、前記接続頭部を形成する工程において、前記外管を長く、前記内管を短く管軸方向にパンチで押し込んでもよい。   The present invention also has a truncated cone-shaped, arc-shaped, or abacus-shaped connection head formed as a pressing surface to the mating seat at the connection end, and the total length of the circumferential surface of the flow hole inside the shaft core A branch formed by tightly fitting a thin inner tube made of stainless steel and forming a sheet surface by bending the tip of the stainless steel inner tube outward so as to cover the tip of the connection head A method for manufacturing a branch pipe, in which only the outer pipe of a tubular body in which a thin stainless steel inner pipe is tightly fitted over the entire length of the peripheral surface of the flow hole inside the shaft core is pushed in the direction of the pipe axis with a punch. By forming the connecting head at the same time, the inner tube protrudes, and then the protruding portion of the inner tube protruding from the connection-side tube end of the outer tube is bent outwardly to expand the connecting head of the outer tube. Covers the tip of the part and forms a sheet surface on the inner peripheral surface of the inner tube Method for producing a branched branch pipe in the fuel rail for an internal combustion engine, characterized in Rukoto is to summarized as. In the step of forming the connection head, the outer tube may be elongated and the inner tube may be shortened and punched in the tube axis direction.

本発明に係る上記分岐枝管の製造方法において、前記内管の突出部を外側に拡径しながら折り曲げてシート面を形成する際、ステンレス製の内管内に芯金を挿入して前記内管の突出部を外側に拡径しながら折り曲げることを特徴とするものである。   In the method for manufacturing a branched branch pipe according to the present invention, when the sheet surface is formed by bending the projecting portion of the inner pipe outwardly, the core pipe is inserted into the stainless inner pipe. The protrusion is bent while expanding the diameter outward.

さらに、本発明に係る上記分岐枝管の製造方法において、前記接続頭部の先端部を覆うステンレス製の内管の外側折り曲げ部が当該接続頭部の先端部と面一となるように前記内管の突出部を当該接続頭部に埋設させてシート面を形成することを特徴とするものである。   Furthermore, in the method for manufacturing a branched branch pipe according to the present invention, the inner bent portion of the stainless steel inner tube covering the tip of the connection head is flush with the tip of the connection head. The protruding portion of the tube is embedded in the connection head to form a sheet surface.

本発明の継手構造は、燃料レールと分岐枝管の接液部が燃料に対する耐食性を有するステンレスまたはNiめっき皮膜やNi基合金めっき皮膜で形成されているため、燃料レールと分岐枝管は腐食環境から完全に保護された状態が確保され防食面における優れた機能が保証される。また、分岐枝管は、外管と内管とからなる二重管で構成され、かつ内管がステンレス鋼管または内周面にNiもしくはNi基合金皮膜等の防錆皮膜が施された管体からなり、燃料に対するシール面を含む接液部分の全てが内管によって覆われ、該内管によって形成されるシート面を含む受圧部等が、外管で保護されるように支持されていることにより、強固な接続状態が健全な状態で維持されると共に、該内管の内周面がシート面となっているため、低級ガソリン、サワーガソリン、DME(ヂメチルエーテル)、アルコール、およびアルコール混合燃料、軽油、水素等の使用に十分に耐えるのみならず、内周面に銅の皮膜が存在しないため燃料の劣化が生じることがない。さらに、継手金具と分岐枝管の間にガスケットを介在させて接続構成した場合には、シート面がガスケットを介して形成されるため、より優れた気密性が確保され、15〜200MPaという高圧の各種燃料をより確実にシールすることができる。また、本発明の分岐枝管の製造方法によれば、簡略な操作によって腐食環境から完全に保護された状態が確保され、防食面における優れた機能を有する分岐枝管を得ることができるため、かつ燃料の劣化を未然に防止するなどの特性に優れた分岐枝管を、低コストで提供することができる。   In the joint structure of the present invention, the wetted part of the fuel rail and the branch branch pipe is formed of stainless steel, Ni plating film or Ni base alloy plating film having corrosion resistance against the fuel. As a result, a completely protected state is secured and an excellent function in the anticorrosion surface is guaranteed. Further, the branch branch pipe is constituted by a double pipe composed of an outer pipe and an inner pipe, and the inner pipe is a stainless steel pipe or an inner peripheral surface of which is provided with a rust preventive film such as Ni or a Ni-based alloy film. The entire wetted part including the sealing surface for the fuel is covered with the inner pipe, and the pressure receiving part including the seat surface formed by the inner pipe is supported so as to be protected by the outer pipe. As a result, a strong connection state is maintained in a healthy state and the inner peripheral surface of the inner pipe is a seat surface, so that lower gasoline, sour gasoline, DME (dimethyl ether), alcohol, and alcohol mixture Not only can it sufficiently withstand the use of fuel, light oil, hydrogen, etc., but there is no deterioration of the fuel because there is no copper film on the inner peripheral surface. Furthermore, when the gasket is interposed between the joint fitting and the branch branch pipe, the seat surface is formed via the gasket, so that better airtightness is secured, and a high pressure of 15 to 200 MPa is achieved. Various fuels can be sealed more reliably. In addition, according to the method for manufacturing a branch branch pipe of the present invention, a state that is completely protected from a corrosive environment by a simple operation is ensured, and a branch branch pipe having an excellent function in the anticorrosion surface can be obtained. In addition, it is possible to provide a branched branch pipe excellent in characteristics such as preventing deterioration of fuel in advance at a low cost.

本発明の内燃機関用燃料レールにおける分岐枝管の接続構造に係る本管レールは、内部を流通路とする管径30m/m程度以下の圧力配管炭素鋼管あるいはステンレス鋼管等の厚肉鋼管材あるいは鋼板からの板金製の管状のレールからなり、その内面の少なくとも燃料に接する部分にはニッケルめっきもしくはニッケル基合金めっき等の防錆処理が施され、該流通路に通じて軸方向にわたる周壁部の内周壁面に、単数もしくは間隔を保持して複数個所での分岐接続体用の貫孔が穿設されている。
なお、本発明における上記の鋼材に代えて、例えばステンレス鋼以外のインコネル、ハステロイ、チタン、チタン基合金あるいはニッケル基合金等の高強度にしてかつ高耐食性に優れる耐熱性金属材料を採用することも可能である。
The main rail according to the connecting structure of the branch branch pipe in the fuel rail for an internal combustion engine according to the present invention is a thick-walled steel pipe material such as a pressure pipe carbon steel pipe or a stainless steel pipe having a pipe diameter of about 30 m / m or less. It consists of a sheet metal tubular rail made of steel plate, and at least the portion of its inner surface that comes into contact with fuel is subjected to rust prevention treatment such as nickel plating or nickel base alloy plating, and the peripheral wall portion extending in the axial direction through the flow passage On the inner peripheral wall surface, through holes for branch connection bodies are formed at a plurality of locations while maintaining a single number or intervals.
In place of the above steel material in the present invention, for example, a heat resistant metal material having high strength and excellent corrosion resistance such as Inconel, Hastelloy, titanium, titanium base alloy or nickel base alloy other than stainless steel may be employed. Is possible.

一方、分岐枝管を接続するための継手金具は、軸心に高圧燃料用の流路となる分岐孔を有する円筒体であり、その外方の接続シール部の外周面には分岐枝管に組み込まれる締結用ナットと螺合するための雄螺子が形成され、該分岐枝管および締結用ナットと共に本管レールと同種または異種の鋼管材もしくは鋼材からなり、該継手金具の接続端部を前記本管レールの貫孔に嵌挿させ、その先端部を本管レールの流通路内に突出させてろう付等により接合される。   On the other hand, the joint fitting for connecting the branch branch pipe is a cylindrical body having a branch hole serving as a flow path for high-pressure fuel at the shaft center, and the outer peripheral surface of the outer connection seal portion is connected to the branch branch pipe. A male screw is formed to be screwed with a fastening nut to be incorporated, and the branch branch pipe and the fastening nut are made of the same or different kind of steel pipe material or steel material as the main rail, and the connecting end portion of the fitting is connected to the connecting pipe. It is inserted into the through hole of the main rail, and its tip is projected into the flow path of the main rail and joined by brazing or the like.

また、高圧燃料噴射用の分岐枝管は、基本的に内管と外管とからなる二重管であり、該内管は管材そのものがステンレス鋼管などの耐食性鋼管材で構成されるか、若しくは少なくともその内周面にニッケルめっき若しくはニッケル基合金めっき等の防錆処理が施され、外管の外周面に比較して燃料に対する防食性能が優れており、しかも外管の開口端部を内管の開口端部で覆うようにシート面を形成し、該シート面と前記継手金具の接続シール部との間に好ましくはガスケットを介在させ、分岐枝管の端末に設けたスプールなどによって形成された受圧部に対し、該分岐枝管に予め組込んだ締結用の袋ナットによる押圧を伴いつつ螺合することによって、本発明による内燃機関用燃料レールにおける分岐枝管の接続構造体が構成される。   The branch branch pipe for high-pressure fuel injection is basically a double pipe consisting of an inner pipe and an outer pipe, and the inner pipe is made of a corrosion-resistant steel pipe material such as a stainless steel pipe, or At least the inner peripheral surface is subjected to rust prevention treatment such as nickel plating or nickel-base alloy plating, and has better anticorrosion performance against fuel than the outer peripheral surface of the outer tube, and the open end of the outer tube is connected to the inner tube A sheet surface is formed so as to cover the opening end of the sheet, and a gasket is preferably interposed between the sheet surface and the connection seal portion of the joint fitting, and is formed by a spool or the like provided at the end of the branch branch pipe The connecting structure of the branch branch pipe in the fuel rail for the internal combustion engine according to the present invention is formed by screwing the pressure receiving portion with the pressure by the fastening nut that is incorporated in the branch branch pipe in advance. .

本発明における前記継手金具の円筒部外径は概ね14m/m程度、肉厚4m/m程度で、前記本管レールと継手金具との接合手段は、高い気密を維持した状態で、しかも強固に接合されて組込まれることが可能な範囲において制限しないが、用いられる鋼材の材質に対応して、通常銅ろうまたはニッケルろうを用いたろう付が好ましく、炉内ろう付による連続ろう付がより好ましく採用される。
[実施例]
In the present invention, the outer diameter of the cylindrical portion of the joint fitting is about 14 m / m and the wall thickness is about 4 m / m, and the means for joining the main rail and the fitting is maintained in a highly airtight and strong state. Although it is not limited to the extent that it can be joined and assembled, brazing using copper brazing or nickel brazing is usually preferred, and continuous brazing by furnace brazing is more preferred, depending on the steel material used. Is done.
[Example]

以下、本発明を、添付した図面に基づいてさらに詳細に説明する。なお、本発明はこれにより拘束されるものではなく、本発明の主旨の範囲内において自由に設計変更が可能であることはいうまでもない。   Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. Needless to say, the present invention is not restricted thereby, and the design can be freely changed within the scope of the gist of the present invention.

図1は本発明の内燃機関用燃料レールにおける分岐枝管の継手構造の第1実施例を示す要部概略縦断面図、図2は同じく第2実施例を示す要部概略縦断面図、図3は同じく第3実施例を示す要部概略縦断面図、図4は同じく第4実施例を示す要部概略縦断面図、図5は同じく第5実施例を示す要部概略縦断面図、図6は同じく第6実施例を示す要部概略縦断面図、図7は同じく第7実施例を示す要部概略縦断面図、図8は同じく第8実施例を示す要部概略縦断面図、図9は同じく第9実施例を示す要部概略縦断面図、図10は本発明の内燃機関用燃料レールにおける分岐枝管の製造方法の第1実施例を概略的に示す工程図、図11は同じく分岐枝管の製造方法の第2実施例を概略的に示す工程図、図12は同じく分岐枝管の製造方法の第3実施例を概略的に示す半截工程図、図13は同じく分岐枝管の製造方法の第4実施例を概略的に示す半截工程図、図14は同じく分岐枝管の製造方法の第5実施例を概略的に示す工程図、図15は図14の第5実施例における成形前の二重金属管の他の管端部を示す断面図、図16は同じく図14の第5実施例により製造される分岐枝管の変形例を示す要部断面図であり、1、11、21、31、41、51、61、71、81は本管レール、2、12、22、32、42、52、62、72、82は継手金具、3、13、23、33、43、53、63、73、83は分岐枝管、4、14、24、34、44、54、64、74、84は締結用ナット、5、15、25、35、45、55、65、75はガスケットである。   FIG. 1 is a schematic vertical sectional view of an essential part showing a first embodiment of a joint structure of a branch branch pipe in a fuel rail for an internal combustion engine according to the present invention. FIG. 2 is a schematic vertical sectional view showing an essential part of the second embodiment. 3 is a schematic vertical cross-sectional view of the main part of the third embodiment, FIG. 4 is a schematic vertical cross-sectional view of the main part of the fourth embodiment, and FIG. 5 is a schematic vertical cross-sectional view of the main part of the fifth embodiment. 6 is a schematic vertical cross-sectional view of the main part showing the sixth embodiment, FIG. 7 is a schematic vertical cross-sectional view of the main part showing the seventh embodiment, and FIG. 8 is a schematic vertical cross-sectional view of the main part showing the eighth embodiment. FIG. 9 is a schematic vertical sectional view of an essential part showing the ninth embodiment, and FIG. 10 is a process diagram schematically showing the first embodiment of the manufacturing method of the branch branch pipe in the fuel rail for the internal combustion engine of the present invention. 11 is a process diagram schematically showing a second embodiment of the branch branch manufacturing method, and FIG. 12 is a third embodiment of the branch branch manufacturing method. FIG. 13 shows a semi-finished process diagram schematically showing a fourth embodiment of the branch branch pipe manufacturing method, and FIG. 14 shows a fifth embodiment of the branch branch manufacturing method. FIG. 15 is a sectional view showing another pipe end portion of the double metal pipe before forming in the fifth embodiment of FIG. 14, and FIG. 16 is also manufactured by the fifth embodiment of FIG. It is principal part sectional drawing which shows the modification of a branch branch pipe, 1, 11, 21, 31, 41, 51, 61, 71, 81 is a main rail, 2, 12, 22, 32, 42, 52, 62. 72, 82 are fittings, 3, 13, 23, 33, 43, 53, 63, 73, 83 are branch branches, 4, 14, 24, 34, 44, 54, 64, 74, 84 are for fastening. Nuts 5, 15, 25, 35, 45, 55, 65 and 75 are gaskets.

図1に示す第1実施例の内燃機関用燃料レールにおける分岐枝管の継手構造は、本管レール1の周壁部に燃料用流通路1−1に通ずる貫孔1−2を設け、該貫孔1−2に継手金具2の接続端部2−1を、その先端部が該流通路1−1内に突出するまで嵌挿した状態をもって相互に接合している。なお、接合手段としてはろう着、溶接もしくは拡散接合などから任意に選択が可能であるが、ニッケルろうを用いた炉内ろう付けを採用することにより効率的に連続ろう付を実施することができる。   The joint structure of the branch branch pipe in the fuel rail for the internal combustion engine of the first embodiment shown in FIG. 1 is provided with a through hole 1-2 that communicates with the fuel flow passage 1-1 in the peripheral wall portion of the main rail 1. The connection end portion 2-1 of the joint fitting 2 is joined to the hole 1-2 with the state where the connection end portion 2-1 is fitted and inserted until the tip portion protrudes into the flow passage 1-1. The joining means can be arbitrarily selected from brazing, welding or diffusion joining, but continuous brazing can be carried out efficiently by adopting in-furnace brazing using nickel brazing. .

継手金具2は、外方開口端部に当該継手金具分岐孔軸に直角な平坦面2−2aを有する断面凹形状の接続シール部2−2が設けられており、この接続シール部2−2にリング状のガスケット5を介して二重管構造の分岐枝管3を凹凸嵌合し、予め分岐枝管3に組み込んだ締結用袋ナット4を、該継手金具2の外周面に形成した雄螺子に螺合し、該分岐枝管3の端末に設けたスプール3−4によって形成された受圧部3−5に対する押圧を伴いつつ締着して、本実施例における内燃機関用燃料レールにおける分岐枝管の継手構造を接続構成する。   The joint fitting 2 is provided with a connection seal portion 2-2 having a concave cross section having a flat surface 2-2a perpendicular to the joint fitting branch hole axis at the outer opening end, and this connection seal portion 2-2. The male branch pipe 3 is formed on the outer peripheral surface of the joint fitting 2 by fitting the branch branch pipe 3 having a double-pipe structure into a concave-convex shape with a ring-shaped gasket 5 on the outer peripheral surface of the joint fitting 2. A branch in the fuel rail for an internal combustion engine in the present embodiment is engaged with a screw and fastened with a pressure against a pressure receiving portion 3-5 formed by a spool 3-4 provided at a terminal of the branch branch pipe 3. The joint structure of the branch pipe is connected.

また、分岐枝管3は、内管3−1がステンレス鋼管、外管3−2が通常の鉄系の鋼管とからなる二重管で構成され、かつ外管3−2の開口端面を内管3−1の開口端部で覆ってシート面3−3を形成し、該シート面3−3と継手金具2のシール部2−2に形成された平坦面2−2aとの間に、好ましくはリング状のガスケット5を介して締着されるため、外管3−2によって支持された前記シート面3−3の押圧により、高圧高温の燃料に対する気密が強固に維持され、かつ該燃料との接液部分3−7には鉄系材料等の露出部が存在せず、その優れた防錆能が得られる。
なお、本実施例においては内管3−1そのものにステンレス鋼管を採用したが、該内管3−1に通常の鉄系鋼管を採用し、該内管3−1の内周面に例えばニッケルめっき等の防錆皮膜を施すことも可能であり、該内管3−1の内周面がシート面3−3となるようにして二重管構造の分岐枝管3を構成してもよい。
Further, the branch branch pipe 3 is composed of a double pipe in which the inner pipe 3-1 is a stainless steel pipe and the outer pipe 3-2 is a normal iron-based steel pipe, and the open end surface of the outer pipe 3-2 is disposed inside. A sheet surface 3-3 is formed by covering with the opening end of the pipe 3-1, and between the sheet surface 3-3 and the flat surface 2-2a formed on the seal portion 2-2 of the fitting 2, Since it is preferably fastened via a ring-shaped gasket 5, air tightness against high-pressure and high-temperature fuel is firmly maintained by pressing the seat surface 3-3 supported by the outer tube 3-2, and the fuel There is no exposed part of iron-based material or the like in the wetted part 3-7, and its excellent rust prevention ability is obtained.
In this embodiment, a stainless steel pipe is used as the inner pipe 3-1, but a normal iron-based steel pipe is used as the inner pipe 3-1, and, for example, nickel is formed on the inner peripheral surface of the inner pipe 3-1. It is also possible to apply a rust preventive film such as plating, and the branch branch pipe 3 having a double pipe structure may be configured such that the inner peripheral surface of the inner pipe 3-1 becomes the sheet surface 3-3. .

図2に示す第2実施例の内燃機関用燃料レールにおける分岐枝管の継手構造は、二重管構造の分岐枝管13のスプール13−4を、外管13−2のみで設けて締結用ナット14に対する受圧部13−5を形成した以外は、第1実施例と同様にして内燃機関用燃料レールにおける分岐枝管の継手構造を構成したもので、その構造は、本管レール11の周壁部に設けた燃料の流通路11−1に通ずる貫孔11−2に、継手金具12の接続端部12−1を内部に突出させて嵌挿した状態をもって相互に接合し、該継手金具12の外方開口端部に設けた接続シール部12−2に好ましくはリング状のガスケット15を介して二重管構造の分岐枝管13を凹凸嵌合し、予め分岐枝管13に組み込んだ締結用袋ナット14を、該継手金具12の外周面に形成した雄螺子に螺合し、該分岐枝管13の端末に設けたスプール13−4によって形成された受圧部13−5に対する押圧を伴いつつ締着して、本実施例における内燃機関用燃料レールにおける分岐枝管の継手構造を接続構成したものである。
本実施例においても、分岐枝管13は、内管13−1がステンレス鋼管、外管13−2が通常の鉄系の鋼管とからなる二重管で構成され、かつ外管13−2の開口端面を内管13−1の開口端部で覆ってシート面13−3を形成し、該シート面13−3と継手金具12のシール部12−2に形成された平坦面12−2aとの間に、リング状のガスケット15を介して締着されるため、外管13−2によって支持された前記シート面13−3の押圧により、高圧高温の燃料に対する気密が強固に維持され、かつ該燃料との接液部分13−7には鉄系材料等の露出部が存在せず、その優れた防錆能が得られる。
The joint structure of the branch branch pipe in the fuel rail for the internal combustion engine of the second embodiment shown in FIG. 2 is for fastening by providing the spool 13-4 of the branch branch pipe 13 of the double pipe structure only by the outer pipe 13-2. Except that the pressure receiving portion 13-5 for the nut 14 is formed, the joint structure of the branch branch pipe in the fuel rail for the internal combustion engine is configured in the same manner as in the first embodiment, and the structure is the peripheral wall of the main rail 11. The joint fitting 12 is joined to the through hole 11-2 communicating with the fuel flow passage 11-1 provided in the joint with the connection end 12-1 of the fitting 12 projecting into the inside thereof. The branch branch pipe 13 having a double-pipe structure is preferably concavo-convexly fitted to the connection seal portion 12-2 provided at the outer opening end of the pipe via a ring-shaped gasket 15 and fastened in advance in the branch branch pipe 13 A cap nut 14 is formed on the outer peripheral surface of the joint fitting 12. The fuel rail for the internal combustion engine in this embodiment is fastened with a pressure against the pressure receiving portion 13-5 formed by a spool 13-4 provided at the end of the branch branch pipe 13 The connection structure of the joint structure of the branch branch pipe in is connected.
Also in the present embodiment, the branch branch pipe 13 is composed of a double pipe in which the inner pipe 13-1 is a stainless steel pipe and the outer pipe 13-2 is a normal iron-based steel pipe. A sheet surface 13-3 is formed by covering the opening end surface with the opening end portion of the inner tube 13-1, and the flat surface 12-2a formed on the sheet surface 13-3 and the seal portion 12-2 of the fitting 12 Since the sheet surface 13-3 supported by the outer tube 13-2 is pressed, the air tightness against the high-pressure and high-temperature fuel is firmly maintained. There is no exposed portion of iron-based material or the like in the liquid contact portion 13-7 with the fuel, and the excellent rust prevention ability is obtained.

図3に示す第3実施例の内燃機関用燃料レールにおける分岐枝管の継手構造は、二重管構造の分岐枝管23の端末に突起23−4を形成して、締結用ナットに対する受圧部23−5とし、継手金具22の外方開口端部に設けた該継手金具分岐孔軸に直角な平坦面22−2aを有する断面凹形状の接続シール部22−2を、外方に広がる傾斜面とした以外は、第1実施例と同様にして内燃機関用燃料レールにおける分岐枝管の継手構造を構成し、高圧高温の燃料に対する強固な気密の維持や、燃料との接液部分23−7には鉄系材料等の露出部が存在せず、その優れた防錆能が高度に保たれる。
なお、本実施例による二重管構造の分岐枝管23は、その接続頭部に截頭円錐状の接続頭部23−4が設けられ、該接続頭部23−4の背面が締結用袋ナット24に対する受圧部23−5なり、先端の管端部には内管23−1の管端部で覆われるようにしてシート面23−3が形成され、本発明に係る内燃機関用燃料レールにおける分岐枝管が構成される。かかる二重管構造の分岐枝管23も、内管23−1がステンレス鋼管または内周面に防錆皮膜が施された管体からなり、上記のように該内管23−1の内周面がシート面23−3となるように外管23−2の開口端面を内管23−1の開口端部で覆った構造となしたものである。
The joint structure of the branch branch pipe in the fuel rail for the internal combustion engine of the third embodiment shown in FIG. 3 is formed with a protrusion 23-4 at the end of the branch branch pipe 23 of the double pipe structure, and a pressure receiving portion for the fastening nut. 23-5, the connecting seal portion 22-2 having a concave cross section having a flat surface 22-2a perpendicular to the joint hole branch hole axis provided at the outer opening end of the joint fitting 22 is inclined to spread outward. In the same manner as in the first embodiment, the branch branch pipe joint structure in the fuel rail for the internal combustion engine is configured in the same manner as in the first embodiment. No exposed portion of iron-based material or the like exists in No. 7, and its excellent rust prevention ability is maintained at a high level.
In addition, the branch branch pipe 23 having a double-pipe structure according to the present embodiment is provided with a truncated conical connection head 23-4 at the connection head, and the back surface of the connection head 23-4 is a fastening bag. A seat surface 23-3 is formed so as to be covered with the tube end portion of the inner tube 23-1 at the tip end of the pipe, which is a pressure receiving portion 23-5 for the nut 24, and the fuel rail for an internal combustion engine according to the present invention. A branch branch pipe is formed. The branch pipe 23 having such a double-pipe structure also has an inner pipe 23-1 made of a stainless steel pipe or a pipe body having a rust-proof coating on the inner peripheral surface, and the inner circumference of the inner pipe 23-1 as described above. The opening end surface of the outer tube 23-2 is covered with the opening end portion of the inner tube 23-1 so that the surface becomes the seat surface 23-3.

図4に示す第4実施例の内燃機関用燃料レールにおける分岐枝管の継手構造は、継手金具32の接続シール部32−2を円錐凸形状とし、分岐枝管の開口端末部をシングルフレアー形状とし、前記円錐凸形状のシール部32−2と前記シングルフレアー形状のシート面33−3との間に、リング状円錐ガスケットを介在させて接続した構成した以外は、実質的に上記各実施例と同様にして燃料レールにおける分岐枝管の接続構造を構成し、高圧高温の燃料に対する気密の維持や防錆能においてほぼ同等の効果を奏する。
その継手構造をより具体的に説明すると、本管レール31の周壁部に設けた燃料の流通路31−1に通ずる貫孔31−2に、継手金具32の接続端部32−1を内部に突出させて嵌挿した状態をもって相互に接合し、該継手金具32の外方開口端部に設けた円錐斜面32−2aを有する円錐凸形状の接続シール部32−2に、好ましくはリング状の円錐ガスケット35を介して二重管構造の分岐枝管33の先端シート面33−3を当接嵌合し、該分岐枝管33の端末に設けられたシングルフレアー部33−4の外周面を受圧部として、予め該分岐枝管33に組み込んだ締結用袋ナット34による押圧を伴いつつ、継手金具32の雄螺子に螺合することにより締着して接続構成したものであり、前記二重管構造の分岐枝管33も内管33−1がステンレス鋼管または内周面に防錆皮膜が施された管体からなり、かつ内管33−1の内周面がシート面33−3となるように内管33−1と外管33−2の開口端面(接続シール部)をシングルフレアー形状となしたものである。
The joint structure of the branch branch pipe in the fuel rail for the internal combustion engine of the fourth embodiment shown in FIG. 4 has a conical convex shape as the connection seal portion 32-2 of the joint fitting 32, and a single flare shape at the opening end of the branch branch pipe. The above embodiments are substantially the same except that a ring-shaped conical gasket is connected between the conical convex seal portion 32-2 and the single-flare seat surface 33-3. In the same manner as above, a branch branch pipe connection structure in the fuel rail is formed, and almost the same effect is exhibited in maintaining airtightness and rust prevention performance for high pressure and high temperature fuel.
The joint structure will be described more specifically. The connection end portion 32-1 of the joint fitting 32 is inserted into the through hole 31-2 that communicates with the fuel flow passage 31-1 provided in the peripheral wall portion of the main rail 31. The conical convex connection seal portion 32-2 having a conical slope 32-2a provided at the outer opening end portion of the joint fitting 32 is joined to each other with the protruding and inserted state, preferably in a ring shape. The tip sheet surface 33-3 of the branch branch pipe 33 having a double pipe structure is abutted and fitted via the conical gasket 35, and the outer peripheral surface of the single flare portion 33-4 provided at the end of the branch branch pipe 33 is provided. The pressure receiving portion is connected and configured by being screwed into a male screw of the joint fitting 32 while being pressed by a fastening cap nut 34 incorporated in the branch branch pipe 33 in advance. An inner pipe 33-1 is also used for the branch branch pipe 33 having a pipe structure. The inner pipe 33-1 and the outer pipe 33-2 are made of a stainless steel pipe or a pipe body having an antirust coating on the inner peripheral surface, and the inner peripheral surface of the inner pipe 33-1 is a sheet surface 33-3. The opening end face (connecting seal part) of this is a single flare shape.

図5に示す第5実施例の内燃機関用燃料レールにおける分岐枝管の継手構造は、継手金具42の接続シール部42−2を、該継手金具42の軸心から外方に拡径する断面凹形状のテーパー壁とし、分岐枝管43の開口端末に形成されたシングルフレアー形状のシート面43−3との間に介在させるガスケットを、前記リンク状円錐ガスケット35に替えて算盤玉形ガスケット45とした以外は、前記第4実施例に示す継手構造と同様の構成としたもので、その構造は、本管レール41の周壁部に設けた燃料の流通路41−1に通ずる貫孔41−2に、継手金具42の接続端部42−1を内部に突出させて嵌挿した状態をもって相互に接合し、該継手金具42の外方開口端部に設けた円錐斜面42−2aを有する円錐凸形状の接続シール部42−2に、算盤玉形ガスケット45を介して二重管構造の分岐枝管43の先端シート面43−3を当接嵌合し、該分岐枝管43の端末に設けられたシングルフレアー部43−4の外周面を受圧部として、予め該分岐枝管43に組み込んだ締結用袋ナット44による押圧を伴いつつ、継手金具42の雄螺子に螺合することにより締着して接続構成したものであり、前記二重管構造の分岐枝管43も内管43−1がステンレス鋼管または内周面に防錆皮膜が施された管体からなり、かつ内管43−1の内周面がシート面43−3となるように内管43−1と外管43−2の開口端面(接続シール部)をシングルフレアー形状となしたものである。
従って、本実施例に係る継手構造も、高圧高温の燃料に対する気密の維持や防錆能においてほぼ同等の効果を奏する。
The joint structure of the branch branch pipe in the fuel rail for the internal combustion engine of the fifth embodiment shown in FIG. 5 is a cross section in which the connection seal portion 42-2 of the joint fitting 42 is expanded outward from the axis of the joint fitting 42. Instead of the link-shaped conical gasket 35, a abacus bead gasket 45 is used as a concave taper wall and interposed between the single-flare sheet surface 43-3 formed at the opening end of the branch branch pipe 43. Except for the above, the structure is the same as the joint structure shown in the fourth embodiment, and the structure is a through hole 41-communicating with the fuel flow passage 41-1 provided in the peripheral wall portion of the main rail 41. 2 having a conical slope 42-2a provided at the outer opening end of the joint fitting 42 with the connection end 42-1 of the joint fitting 42 projecting inwardly into the joint fitting 42. Convex connection seal 42 2, the front sheet surface 43-3 of the branch branch pipe 43 having a double-pipe structure is abutted and fitted via an abacus bead gasket 45, and a single flare portion 43- provided at the end of the branch branch pipe 43 is fitted. 4 with the outer peripheral surface of 4 as a pressure receiving portion, and being connected by being fastened by being screwed into the male screw of the joint fitting 42 while being pressed by the fastening cap nut 44 incorporated in the branch branch pipe 43 in advance. The branch pipe 43 having the double-pipe structure has the inner pipe 43-1 made of a stainless steel pipe or a pipe body having a rust-proof coating on the inner peripheral face, and the inner peripheral face of the inner pipe 43-1 is a sheet. The opening end faces (connection seal portions) of the inner tube 43-1 and the outer tube 43-2 are formed into a single flare shape so as to be the surface 43-3.
Therefore, the joint structure according to the present embodiment also has substantially the same effect in maintaining airtightness and high rust prevention performance against high pressure and high temperature fuel.

図6に示す第6実施例の内燃機関用燃料レールにおける分岐枝管の継手構造は、本管レール51の周壁部に設けた燃料の流通路51−1に通ずる貫孔51−2に、その接続端部52−1を内部に突出させて嵌挿した状態をもって相互に接合された継手金具52の外方開口端部に設けられる接続シール部52−2が、該継手金具52の分岐孔52−3の軸芯に対して直角な平坦面52−2aを有する断面凸形状に形成され、二重管構造の分岐枝管53は端末に拡径部53−4が形成され、該拡径部53−4に連なる管端部に内管53−1と外管53−2とが面一のシート面53−3が設けられ、前記継手金具52の凸形状の接続シール部52−2に外嵌したリング状のガスケット55を介して該二重管構造の分岐枝管53を凹凸嵌合し、予め該分岐枝管53の拡径部53−4と締結用袋ナット54の間に組み込んだワッシャ56の押圧座面部56−1を、該拡径部53−4の受圧部53−5に対する押圧を伴いつつ締結用袋ナット54を継手金具52の雄螺子に螺合・締着して接続構成したものであり、高圧高温の燃料に対する気密の維持や防錆能においてほぼ同等の効果を奏する。
なお、本実施例における二重管構造の分岐枝管53も、前記第4実施例および第5実施例における分岐枝管と同様、内管53−1と外管53−2とからなる二重管で構成され、かつ内管53−1がステンレス鋼管または内周面に防錆皮膜が施された管体からなり、内管53−1と外管53−2の開口端面がシート面53−3となるように形成し、同様拡径部53−4も内管53−1と外管53−2とで形成し、その外周面をワッシャ56の押圧座面部56−1に対する受圧部53−5としたものである。
The joint structure of the branch branch pipe in the fuel rail for the internal combustion engine of the sixth embodiment shown in FIG. 6 is formed in the through hole 51-2 that communicates with the fuel flow passage 51-1 provided in the peripheral wall portion of the main pipe rail 51. A connection seal portion 52-2 provided at an outer opening end portion of the joint fitting 52 that is joined to each other with the connection end portion 52-1 protruding and inserted therein is a branch hole 52 of the joint fitting 52. -3 is formed in a convex section having a flat surface 52-2a perpendicular to the axis of the shaft 3, and the branch branch pipe 53 having a double-pipe structure has a diameter-enlarged portion 53-4 formed at the end thereof. 53-4 is provided with a sheet surface 53-3 in which the inner tube 53-1 and the outer tube 53-2 are flush with each other at the end of the tube connected to the convex connection seal portion 52-2 of the fitting 52. The branch branch pipe 53 of the double pipe structure is concavo-convexly fitted through the fitted ring-shaped gasket 55, and the The pressing seat surface part 56-1 of the washer 56 incorporated between the enlarged diameter part 53-4 of the branch pipe 53 and the fastening nut 54 is accompanied by pressing of the enlarged diameter part 53-4 against the pressure receiving part 53-5. On the other hand, the fastening cap nut 54 is connected to the male screw of the joint fitting 52 by being screwed and fastened, and has substantially the same effect in maintaining airtightness and rust prevention performance against high pressure and high temperature fuel.
In addition, the branch branch pipe 53 of the double pipe structure in the present embodiment is also a double branch consisting of an inner pipe 53-1 and an outer pipe 53-2, like the branch branch pipe in the fourth and fifth embodiments. The inner pipe 53-1 is made of a stainless steel pipe or a pipe body having an antirust coating on the inner peripheral surface, and the open end faces of the inner pipe 53-1 and the outer pipe 53-2 are seat surfaces 53-. 3 and the enlarged diameter portion 53-4 is also formed by the inner tube 53-1 and the outer tube 53-2, and the outer peripheral surface of the pressure receiving portion 53- with respect to the pressing seat surface portion 56-1 of the washer 56 is formed. It is set to 5.

図7に示す第7実施例の内燃機関用燃料レールにおける分岐枝管の継手構造は、本管レール61の周壁部に設けた燃料の流通路61−1に通ずる貫孔61−2に、その接続端部62−1を内部に突出させて嵌挿した状態をもって相互に接合された継手金具62の接続シール部62−2に、分岐孔62−3の軸芯に対する傾斜角αが58°の断面凹状のテーパー面62−2aを形成し、内管63−1と外管63−2とからなる二重管構造を有する分岐枝管63の該外管63−2の端末に、スプール63−4を設けて締結用袋ナット64に対する受圧部63−5を形成し、その先端に連なる接続頭部を、前記継手金具62の接続シール部62−2における分岐孔62−3の軸芯に対する傾斜角58°を有する凹状のテーパー面62−2aに対応して、前記分岐孔62−3の軸芯に対する傾斜角αが58°の凸状のテーパー壁63−6を有する形状とし、該凸状のテーパー壁63−6を有する外管63−2の接続頭部を覆うようにして内管63−1の管端部を外側に折り曲げてコーン状のシート面63−3を形成し、該シート面63−3と前記継手金具62の接続シール部62−2に形成された前記テーパー面62−2aとの間に、好ましくは略リング形状の円錐ガスケット65を介在させ、予め分岐枝管63に組み込んだ締結用袋ナット64を、該継手金具62の外周面に形成した雄螺子に螺合し、該分岐枝管63の端末に設けたスプール63−4によって形成された受圧部63−5に対する押圧を伴いつつ締着して、本実施例における内燃機関用燃料レールにおける分岐枝管の継手構造を接続構成したものである。
本実施例における前記分岐枝管63は、内管63−1が薄肉のステンレス鋼管、外管63−2が通常の鉄系の厚肉の鋼管とからなる二重管で構成され、かつ外管63−2の開口端面を内管63−1の開口端部で覆ってシート面63−3を形成し、該シート面63−3を含む内管63−1の受圧部は前記外管63−2によって保護するように支持され、その剛性が付与されることにより、継手金具62のシール部62−2に形成されたテーパー面62−2aとの間に、リング状のガスケット65を介して締着される際に、テーパー面同士の圧着による結合により、高圧高温の燃料に対する気密が強固に維持され、かつ該燃料との接液部分63−7には鉄系材料等の露出部が存在せず、その優れた防錆能が得られる。 なお、本実施例においては内管63−1そのものにステンレス鋼管を採用したが、該内管63−1に通常の鉄系鋼管を採用し、該内管63−1の内周面に例えばニッケルめっき等の防錆皮膜が施すことも可能であり、該内管63−1の内周面がシート面63−3となるようして二重管構造の分岐枝管63を構成してもよい。
The joint structure of the branch branch pipe in the fuel rail for the internal combustion engine of the seventh embodiment shown in FIG. 7 is formed in the through hole 61-2 that communicates with the fuel flow passage 61-1 provided in the peripheral wall portion of the main pipe rail 61. An inclination angle α of the branch hole 62-3 with respect to the axis of the branch hole 62-3 is 58 ° in the connection seal portion 62-2 of the joint fitting 62 which is joined with the connection end portion 62-1 protruding and inserted inside. A spool 63- is formed at the end of the outer pipe 63-2 of the branch branch pipe 63 having a double-pipe structure formed with a tapered surface 62-2a having a concave cross section and having an inner pipe 63-1 and an outer pipe 63-2. 4 is formed to form a pressure receiving portion 63-5 for the fastening nut 64, and the connecting head connected to the tip thereof is inclined with respect to the axis of the branch hole 62-3 in the connecting seal portion 62-2 of the fitting 62. Corresponding to the concave tapered surface 62-2a having an angle of 58 ° The connecting head of the outer tube 63-2 having a convex tapered wall 63-6 having an inclined angle α of 58 ° with respect to the axis of the branch hole 62-3 and having the convex tapered wall 63-6. The tube end portion of the inner tube 63-1 is bent outward so as to cover the surface of the inner tube 63-1 to form a cone-shaped seat surface 63-3, and the connection seal portion 62-2 of the joint surface 62 and the seat surface 63-3 is formed. Between the formed tapered surface 62-2a, a substantially ring-shaped conical gasket 65 is preferably interposed, and a fastening cap nut 64 previously incorporated in the branch branch pipe 63 is provided on the outer peripheral surface of the joint fitting 62. The internal combustion engine fuel according to this embodiment is engaged with the formed male screw and is fastened while being pressed against the pressure receiving portion 63-5 formed by the spool 63-4 provided at the end of the branch branch pipe 63. The joint structure of the branch branch pipe in the rail It is that to continue configuration.
The branch branch pipe 63 in this embodiment is composed of a double pipe in which the inner pipe 63-1 is a thin stainless steel pipe, and the outer pipe 63-2 is a normal steel thick steel pipe. The opening end surface of 63-2 is covered with the opening end portion of the inner tube 63-1, thereby forming a seat surface 63-3. The pressure receiving portion of the inner tube 63-1 including the seat surface 63-3 is the outer tube 63-. 2 is supported so as to be protected by 2, and is provided with rigidity so that it is tightened via a ring-shaped gasket 65 between the tapered surface 62-2a formed on the seal portion 62-2 of the fitting 62. When being attached, the taper surfaces are bonded to each other by pressure bonding, so that the airtightness against the high-pressure and high-temperature fuel is firmly maintained, and there is no exposed portion such as an iron-based material in the liquid contact portion 63-7 with the fuel. Therefore, the excellent rust prevention ability is obtained. In this embodiment, a stainless steel pipe is used for the inner pipe 63-1, but a normal iron-based steel pipe is used for the inner pipe 63-1, and nickel, for example, is formed on the inner peripheral surface of the inner pipe 63-1. A rust preventive film such as plating can be applied, and the branch branch pipe 63 having a double pipe structure may be configured so that the inner peripheral surface of the inner pipe 63-1 becomes the sheet surface 63-3. .

図8に示す第8実施例の内燃機関用燃料レールにおける分岐枝管の継手構造は、本管レール71の周壁部に設けた燃料の流通路71−1に通ずる貫孔71−2に、その接続端部72−1を内部に突出させて嵌挿した状態をもって相互に接合された継手金具72の接続シール部72−2に、分岐孔72−3の軸芯に対する傾斜角αが58°の断面凹状のテーパー面72−2aを形成し、一方、内管73−1と外管73−2とからなる二重管構造を有する分岐枝管73は、外管73−2によって形成される分岐枝管73の接続頭部の先端形状が、該分岐枝管73の軸心に対してほぼ直角に形成され、該接続頭部の後方に連なるスプール73−4の背面には、締結用袋ナット74に対する受圧部73−5が形成され、内管73−1の管端の突出部が外側に折り曲げられて前記接続頭部の壁面を覆って、さらに内側に折り曲げられて折り返し二重構造のテーパー壁となし、分岐枝管73の軸心に対して傾斜角αが58°のシート面73−3が形成され、該シート面73−3と前記継手金具72の接続シール部72−2に形成された前記テーパー面72−2aとの間に、好ましくは略リング形状の円錐ガスケット75を介在させ、予め分岐枝管73に組み込んだ締結用袋ナット74を、該継手金具72の外周面に形成した雄螺子に螺合し、該分岐枝管73の端末に設けたスプール73−4によって形成された受圧部73−5に対する押圧を伴いつつ締着して、本実施例における内燃機関用燃料レールにおける分岐枝管の継手構造を接続構成したもので、この場合も高圧高温の燃料に対する気密が強固に維持され、かつ該燃料との接液部分73−7には鉄系材料等の露出部が存在せず、その優れた防錆能が得られる。   The joint structure of the branch branch pipe in the fuel rail for the internal combustion engine of the eighth embodiment shown in FIG. 8 is formed in the through-hole 71-2 communicating with the fuel flow passage 71-1 provided in the peripheral wall portion of the main pipe rail 71. An inclination angle α of the branch hole 72-3 with respect to the axis of the branch hole 72-3 is 58 ° to the connection seal portion 72-2 of the joint fitting 72 which is joined with the connection end portion 72-1 protruding and inserted inside. A branched branch pipe 73 which forms a tapered surface 72-2a having a concave cross section and has a double pipe structure consisting of an inner pipe 73-1 and an outer pipe 73-2 is a branch formed by the outer pipe 73-2. The distal end shape of the connection head of the branch pipe 73 is formed substantially perpendicular to the axis of the branch branch pipe 73, and a fastening cap nut is provided on the back surface of the spool 73-4 connected to the rear of the connection head. 74 is formed with respect to 74, and the projecting portion of the tube end of the inner tube 73-1 is outside. The sheet surface is bent to the side to cover the wall surface of the connecting head, and further bent to the inside to form a double-walled tapered wall, with an inclination angle α of 58 ° with respect to the axial center of the branch branch pipe 73 7-3 is formed, and a substantially ring-shaped conical gasket 75 is preferably provided between the seat surface 73-3 and the tapered surface 72-2a formed on the connection seal portion 72-2 of the fitting 72. A fastening cap nut 74 that is interposed and incorporated in advance in the branch branch pipe 73 is screwed into a male screw formed on the outer peripheral surface of the joint fitting 72, and a spool 73-4 provided at the end of the branch branch pipe 73 is used. The joint structure of the branch branch pipe in the fuel rail for the internal combustion engine in this embodiment is connected and configured with pressure applied to the formed pressure receiving portion 73-5. Is strong The exposed portion 73-7 in contact with the fuel does not have an exposed portion such as an iron-based material, and its excellent rust prevention ability is obtained.

図9に示す第9実施例の内燃機関用燃料レールにおける分岐枝管の継手構造は、本管レール81の周壁部に設けた燃料の流通路81−1に通ずる貫孔81−2に、その接続端部82−1を内部に突出させて嵌挿した状態をもって相互に接合された継手金具82の接続シール部82−2に、流通路81−1に通ずる分岐孔82−3部を外方に開口する受圧面82−2aとなし、ステンレス製の薄肉の内管83−1と通常の鉄系の鋼管からなる厚肉の外管83−2とからなる二重管構造を有する分岐枝管83の該外管83−2の端末に、算盤珠状の接続頭部83−4を設けて締結用袋ナット84に対する受圧部83−5と、前記継手金具82の接続シール部82−2に対応する押圧面83−6を形成し、前記押圧面83−6を有する外管83−2の接続頭部83−4を覆うようにして内管83−1の管端部を外側に折り曲げてシート面83−3を形成し、該シート面83−3を前記継手金具82側の受圧面82−2aに当接係合せしめた状態で、予め分岐枝管83に組み込んだ締結用袋ナット84を、該継手金具82の外周面に形成した雄螺子に螺合し、該分岐枝管83の端末に設けた接続頭部83−4によって形成された受圧部83−5に対する押圧を伴いつつ締着して、本実施例における内燃機関用燃料レールにおける分岐枝管の継手構造を接続構成したものである。
本実施例における前記分岐枝管83は、内管83−1が薄肉のステンレス鋼管、外管83−2が通常の鉄系の厚肉の鋼管とからなる二重管で構成され、かつ外管83−2の接続頭部83−4の開口端面を内管83−1の開口端部で覆ってシート面83−3が形成され、継手金具82に締着される際に、シート面同士の圧着による結合により、高圧高温の燃料に対する気密が強固に維持されると共に、燃料との接液部分83−7には鉄系材料等の露出部が存在せず、その優れた防錆能が得られる。
The joint structure of the branch branch pipe in the fuel rail for the internal combustion engine of the ninth embodiment shown in FIG. 9 is formed in the through-hole 81-2 communicating with the fuel flow passage 81-1 provided in the peripheral wall portion of the main pipe rail 81. A branch hole 82-3 communicating with the flow passage 81-1 is outwardly connected to the connection seal portion 82-2 of the joint fitting 82 which is joined with the connection end portion 82-1 protruding inside. Branching pipe having a double pipe structure comprising a thin inner pipe 83-1 made of stainless steel and a thick outer pipe 83-2 made of a normal iron-based steel pipe. 83, an abacus bead-shaped connection head 83-4 is provided at the end of the outer pipe 83-2, and the pressure receiving portion 83-5 for the fastening cap nut 84 and the connection seal portion 82-2 of the joint fitting 82 are provided. A corresponding pressing surface 83-6 is formed, and an outer tube 83-2 having the pressing surface 83-6. A pipe end of the inner pipe 83-1 is bent outward so as to cover the connection head 83-4 to form a seat surface 83-3, and the seat surface 83-3 is a pressure receiving surface 82 on the joint fitting 82 side. -2a in a state of being brought into contact with and engaged with the joint branch 82, a fastening cap nut 84 that is previously incorporated in the branch branch pipe 83 is screwed into a male screw formed on the outer peripheral surface of the joint fitting 82, and the branch branch pipe 83 The joint structure of the branch branch pipe in the fuel rail for the internal combustion engine according to the present embodiment is connected and configured by being fastened while being pressed against the pressure receiving portion 83-5 formed by the connection head 83-4 provided at the terminal. It is.
The branch branch pipe 83 in this embodiment is constituted by a double pipe in which the inner pipe 83-1 is a thin stainless steel pipe, and the outer pipe 83-2 is a normal iron-based thick steel pipe, and the outer pipe. When the opening end surface of the connection head 83-4 of 83-2 is covered with the opening end portion of the inner pipe 83-1, a sheet surface 83-3 is formed and is fastened to the joint fitting 82. Airtightness against high-pressure and high-temperature fuel is firmly maintained by bonding by pressure bonding, and there is no exposed portion of iron-based material or the like in the wetted part 83-7 with the fuel, and the excellent rust prevention ability is obtained. It is done.

次に、前記各実施例において採用された本発明による内燃機関用燃料レールにおける分岐枝管3、13、63、73、83の製造方法について説明する。
まず、前記継手構造の第1実施例において採用された分岐枝管3は、図10にその製造方法を第1実施例として示すように、内管3−1と外管3−2とからなる二重構造の金属管の端末を、該内管3−1および該外管3−2同時に管軸方向にパンチで押し込むことにより、内外管によるスプール3−4を設け、該スプール3−4の外周面に締結用袋ナット4に対する受圧部3−5が形成される。次いで該外管3−2の管端部を切除して内管3−1の管端部を突出させ、該突出部を外側に拡径しながら折り曲げ、該外管3−2の管端部を覆うと共に、該内管3−1の内周面でシート面3−3を形成し、接液部3−7が全て防錆能に優れる内管3−1で覆われ、かつ該内管3−1のシート面3−3を含む受圧部等が前記外管3−2によって保護するように支持された分岐枝管3を得ることができる。
なお、この二重構造の分岐枝管3において、内管3−1を、外管3−2に対する防錆能に優れる金属材料で構成するか、もしくは内管3−1の内周面に防錆処理を施すことについては前記継手構造の第1実施例と同様である。なお、第1〜第8実施例のごとくシート面83−3と受圧面82−2aの間にガスケットを介在させることができることはいうまでもない。
Next, a method for manufacturing the branch branch pipes 3, 13, 63, 73, 83 in the fuel rail for an internal combustion engine according to the present invention employed in each of the embodiments will be described.
First, the branch branch pipe 3 employed in the first embodiment of the joint structure is composed of an inner pipe 3-1 and an outer pipe 3-2 as shown in FIG. A double-structured metal pipe end is punched in the axial direction of the inner pipe 3-1 and the outer pipe 3-2 at the same time, thereby providing a spool 3-4 by the inner and outer pipes. A pressure receiving portion 3-5 for the fastening cap nut 4 is formed on the outer peripheral surface. Next, the tube end portion of the outer tube 3-2 is cut out to project the tube end portion of the inner tube 3-1, and the projecting portion is bent while expanding the diameter outward. And the sheet surface 3-3 is formed on the inner peripheral surface of the inner pipe 3-1, and all the liquid contact parts 3-7 are covered with the inner pipe 3-1 having excellent rust prevention ability, and the inner pipe The branch branch pipe 3 supported so that the pressure receiving part including the sheet surface 3-3 of 3-1 is protected by the outer pipe 3-2 can be obtained.
In this double-structure branch branch pipe 3, the inner pipe 3-1 is made of a metal material having an excellent rust-preventing ability with respect to the outer pipe 3-2 or is prevented from being formed on the inner peripheral surface of the inner pipe 3-1. The rust treatment is the same as in the first embodiment of the joint structure. Needless to say, a gasket can be interposed between the sheet surface 83-3 and the pressure receiving surface 82-2a as in the first to eighth embodiments.

前記継手構造の第2実施例において採用された分岐枝管13の製造方法は、図11にその製造方法を第2実施例として示すように、内管13−1と外管13−2とからなる二重構造の金属管の端末のうち、該外管3−2のみを管軸方向にパンチで押し込むことにより、外管によるスプール13−4を設け、該スプール13−4の外周面に締結用袋ナット14に対する受圧部13−5が形成される。次いで、外管13−2によるスプール部13−4の形成により突出した内管13−1の管端部を、外側に拡径しながら折り曲げ、外管13−2の管端部を覆うと共に、内管13−1の内周面でシート面13−3を形成し、接液部13−7が全て防錆能に優れる内管13−1で覆われ、かつ該内管13−1のシート面13−3を含む受圧部等が前記外管13−2によって保護するように支持された分岐枝管
13を得ることができる。
なお、この二重構造の分岐枝管13においても、内管13−1を、外管13−2に対する防錆能に優れる金属材料で構成するか、もしくは内管13−1の内周面に防錆処理を施すことについては前記と同様である。
The manufacturing method of the branch branch pipe 13 adopted in the second embodiment of the joint structure is shown in FIG. 11 from the inner pipe 13-1 and the outer pipe 13-2 as shown in the second embodiment. Among the ends of the double-structured metal tube, only the outer tube 3-2 is punched in the tube axis direction to provide a spool 13-4 by the outer tube and fastened to the outer peripheral surface of the spool 13-4 A pressure receiving portion 13-5 for the bag nut 14 is formed. Next, the tube end portion of the inner tube 13-1 that protrudes due to the formation of the spool portion 13-4 by the outer tube 13-2 is bent while expanding the diameter outward, covering the tube end portion of the outer tube 13-2, A sheet surface 13-3 is formed on the inner peripheral surface of the inner tube 13-1, and all of the liquid contact parts 13-7 are covered with the inner tube 13-1 having excellent rust prevention ability, and the sheet of the inner tube 13-1 is formed. The branch branch pipe 13 supported so that the pressure receiving part including the surface 13-3 is protected by the outer pipe 13-2 can be obtained.
In this double-branch branch pipe 13 as well, the inner pipe 13-1 is made of a metal material that is excellent in rust prevention performance against the outer pipe 13-2, or on the inner peripheral surface of the inner pipe 13-1. The rust prevention treatment is the same as described above.

前記継手構造の第7実施例において採用された分岐枝管63の製造方法は、図12にその製造方法を第3実施例として示すように内管63−1と外管63−2とからなる二重構造の金属管(a)の端末において、外管63−2のみを管軸方向にパンチで押し込むことにより、当該外管にスプール63−4を設け(b)、該スプール63−4の外周面に締結用袋ナット64に対する受圧部63−5を形成する。この時、前記内管63−1の管端が外管63−2の管端に対して突出する。次いで、外管63−2の管端部を該分岐枝管63の軸心に対して傾斜角αが58°となるよう機械的に切削してテーパー壁63−6を形成すると(c)、前記突出した内管63−1の管端部を外側に拡径しながら折り曲げ(d)、外管63−2の管端部に形成されたテーパー壁63−6を覆うと共に、内管63−1の内周面で該分岐枝管63の軸心に対して58°の傾斜角αを有するシート面63−3を形成し(e)、接液部63−7が全て防錆能に優れる内管63−1で覆われ、かつ内管63−1のシート面63−3を含む受圧部等が前記外管63−2によって保護するように支持された分岐枝管63を得ることができる。
なお、この二重構造の分岐枝管63においても、内管63−1を、外管63−2に対する防錆能に優れる金属材料で構成するか、もしくは該内管の内周面に防錆処理を施すことについては前記と同様である。
The manufacturing method of the branch branch pipe 63 employed in the seventh embodiment of the joint structure includes an inner pipe 63-1 and an outer pipe 63-2 as shown in FIG. 12 as the third embodiment. At the end of the double-structured metal pipe (a), only the outer pipe 63-2 is punched in the pipe axis direction to provide a spool 63-4 on the outer pipe (b). A pressure receiving portion 63-5 for the fastening cap nut 64 is formed on the outer peripheral surface. At this time, the tube end of the inner tube 63-1 protrudes from the tube end of the outer tube 63-2. Next, when the pipe end portion of the outer pipe 63-2 is mechanically cut with respect to the axis of the branch branch pipe 63 so that the inclination angle α is 58 ° to form a tapered wall 63-6 (c), The pipe end portion of the protruding inner pipe 63-1 is bent while expanding the outside diameter (d) to cover the tapered wall 63-6 formed at the pipe end portion of the outer pipe 63-2 and the inner pipe 63-. The sheet surface 63-3 having an inclination angle α of 58 ° with respect to the axial center of the branch branch pipe 63 is formed on the inner peripheral surface of 1 (e), and all the liquid contact parts 63-7 are excellent in rust prevention ability. The branch branch pipe 63 covered with the inner pipe 63-1, and supported so that the pressure receiving portion including the seat surface 63-3 of the inner pipe 63-1 is protected by the outer pipe 63-2 can be obtained. .
In this double-structure branch branch pipe 63 as well, the inner pipe 63-1 is made of a metal material that is excellent in rust prevention ability with respect to the outer pipe 63-2, or the inner peripheral surface of the inner pipe is rust-proof. The processing is the same as described above.

前記継手構造の第8実施例において採用された分岐枝管73の製造方法は、図13にその製造方法を第4実施例として示すように、内管73−1と外管73−2とからなる二重構造の金属管(a)の端末の、外管73−2のみを管軸方向にパンチで押し込むことにより、外管73−2の端末の接続頭部にスプール73−4を設け(b)、該スプール73−4の外周面の後方に締結用袋ナット74に対する受圧部73−5を形成する。この時、前記接続頭部の先端面が同図(b)に示すように分岐枝管73の軸心に対してほぼ直角の壁面73−6に形成され、内管73−1の管端が外管73−2の管端に対して突出する。次いで、前記突出した内管73−1の管端部を、前記外管の直角の壁面73−6に密着するように外側に拡径しながら折り曲げ、該外管73−2の接続頭部を覆うと共に、同図(c
)に示すように該内管73−1を内側に折り曲げ、折り返し二重構造のテーパー壁を形成し、該テーパー壁を分岐枝管73の軸心に対して58°の傾斜角αとなるよう調整してシート面73−3を形成し、接液部73−7が全て防錆能に優れる内管73−1で覆われ、かつ該内管73−1のシート面73−3を含む受圧部等が前記外管73−2によって保護するように支持された分岐枝管73を得ることができる。
なお、この二重構造の分岐枝管73においても、内管73−1を、外管73−2に対する防錆能に優れる金属材料で構成するか、もしくは内管の内周面に防錆処理を施すことについては前記と同様である。
The manufacturing method of the branch branch pipe 73 employed in the eighth embodiment of the joint structure is shown in FIG. 13 from the inner pipe 73-1 and the outer pipe 73-2 as shown in the fourth embodiment. A spool 73-4 is provided at the connection head of the terminal of the outer tube 73-2 by punching only the outer tube 73-2 of the terminal of the double-structured metal tube (a) with a punch in the tube axis direction ( b) A pressure receiving portion 73-5 for the fastening nut 74 is formed behind the outer peripheral surface of the spool 73-4. At this time, the front end surface of the connecting head is formed on a wall surface 73-6 substantially perpendicular to the axial center of the branch branch pipe 73 as shown in FIG. It protrudes with respect to the tube end of the outer tube 73-2. Next, the protruding end portion of the inner tube 73-1 is bent while expanding the outside diameter so as to be in close contact with the right-angle wall surface 73-6 of the outer tube, and the connection head of the outer tube 73-2 is bent. The same figure (c
), The inner tube 73-1 is bent inward to form a double-walled tapered wall, and the tapered wall has an inclination angle α of 58 ° with respect to the axis of the branch branch tube 73. The pressure is adjusted to form the sheet surface 73-3, and the wetted part 73-7 is entirely covered with the inner pipe 73-1 having excellent rust prevention ability and includes the sheet surface 73-3 of the inner pipe 73-1 The branch branch pipe 73 supported so that the part and the like are protected by the outer pipe 73-2 can be obtained.
Also in this double-branch branch branch pipe 73, the inner pipe 73-1 is made of a metal material excellent in rust prevention ability with respect to the outer pipe 73-2, or the inner peripheral surface of the inner pipe is rust-proofed. Is the same as described above.

前記継手構造の第9実施例において採用された分岐枝管83の製造方法は、図14にその製造方法を第5実施例として示すように、ステンレス製の内管83−1と外管83−2とからなる二重構造の金属管(a)の端末の、外管83−2を長く、内管83−1を短く管軸方向にパンチで押し込むことにより、外管83−2の端末に算盤珠状の接続頭部83−4を設け(b)、内管83−1を外管83−2の内面に密着させると共に該接続頭部83−4の首下部に締結用袋ナット84に対する受圧部83−5を形成する。この成形により、内管83−1の管端が外管83−2の管端に対して突出する(b)。次いで、前記突出した内管83−1の管端部を、前記外管の算盤珠状の接続頭部83−4の外壁面に密着するように外側に拡径しながら折り曲げ(c)、外管83−2の接続頭部83−4を覆うと共に、その外側折り曲げ部を接続頭部83−4の外壁面に強く押し付けて該
壁面と面一になるように接続頭部に埋設してシート面83−3を形成することにより、接液部分83−7が全て防錆能に優れる内管83−1で覆われ、かつ接続頭部83−4のシート面が内管83−1で形成された分岐枝管83を得ることができる。
なお、外管83−2の算盤珠状の接続頭部83−4に内管83−1の端部を折り曲げる際は、内管83−1内に芯金(図示せず)を挿入して折り曲げ成形してもよい。この芯金は、パンチ(図示せず)と一体または別体のいずれでもよい。
The manufacturing method of the branch branch pipe 83 employed in the ninth embodiment of the joint structure is as shown in FIG. 14 as the fifth embodiment. The inner pipe 83-1 and the outer pipe 83-3 are made of stainless steel. The end of the double pipe metal tube (a) consisting of 2 is pushed into the end of the outer tube 83-2 by pushing the outer tube 83-2 long and the inner tube 83-1 short in the axial direction of the tube. An abacus bead-shaped connection head 83-4 is provided (b), the inner tube 83-1 is brought into close contact with the inner surface of the outer tube 83-2, and the neck portion of the connection head 83-4 is attached to the fastening cap nut 84. A pressure receiving portion 83-5 is formed. By this molding, the tube end of the inner tube 83-1 protrudes from the tube end of the outer tube 83-2 (b). Next, the protruding end of the inner pipe 83-1 is bent while expanding the outer diameter so as to be in close contact with the outer wall surface of the abacus bead-shaped connection head 83-4 of the outer pipe (c), Cover the connection head 83-4 of the pipe 83-2 and squeeze the outer bent portion of the connection head 83-4 against the outer wall surface of the connection head 83-4 so as to be flush with the wall surface. By forming the surface 83-3, all of the liquid contact parts 83-7 are covered with the inner tube 83-1 having excellent rust prevention ability, and the sheet surface of the connection head 83-4 is formed with the inner tube 83-1. A branched branch pipe 83 can be obtained.
When bending the end of the inner tube 83-1 to the abacus bead-shaped connection head 83-4 of the outer tube 83-2, a cored bar (not shown) is inserted into the inner tube 83-1. Bending may be performed. This metal core may be integrated with a punch (not shown) or separate.

前記図14に示す分岐枝管83の製造方法における成形前の二重金属管管の管端部は、図15(a)に示すように予め内管83−1を外管83−2より適当長さ突出させるか、同図(b)に示すように予め外管83−2を内管83−1より適当長さ突出させて、頭部成形を実施してもよい。   In the manufacturing method of the branch branch pipe 83 shown in FIG. 14, the pipe end portion of the double metal pipe before forming is appropriately longer than the outer pipe 83-2 in the inner pipe 83-1 as shown in FIG. 15 (a). Alternatively, the head may be molded by protruding the outer tube 83-2 from the inner tube 83-1 by an appropriate length in advance, as shown in FIG.

また、前記図14に示す製造方法により製造される分岐枝管83の接続頭部83−4の外壁面を覆う内管の折り返し部は、図16に示すように必ずしも接続頭部に埋設して外壁面と面一にする必要はなく、段差が存在してもよい。また、接続頭部の内側にポケット部(空隙)が存在するタイプの場合、内管は必ずしもこのポケット部内面に沿って密着させる必要はなく、内管とポケット部との間に環状の空隙が存在してもよい。   Further, the inner tube folded portion covering the outer wall surface of the connection head 83-4 of the branch branch pipe 83 manufactured by the manufacturing method shown in FIG. 14 is not necessarily embedded in the connection head as shown in FIG. There is no need to be flush with the outer wall surface, and a step may exist. In addition, in the case of a type in which a pocket portion (gap) exists inside the connection head, the inner tube does not necessarily need to be closely adhered along the inner surface of the pocket portion, and an annular gap is formed between the inner tube and the pocket portion. May be present.

上記した各実施例に示す本発明の継手構造は、各本管レール1、11、21、31、41、51、61、71、81と各分岐枝管3、13、23、33、43、53、63、73、83の接液部分が燃料に対する耐食性を有するステンレスまたはNiめっき皮膜やNi基合金めっき皮膜の複層もしくは拡散した単層の皮膜で形成されているため、本管レールや分岐枝管に錆等の発生が皆無であり、また内周面に銅の皮膜が存在しないため燃料の劣化が生じることもない。さらに、各継手金具2、12、22、32、42、52、62、72と各分岐枝管3、13、23、33、43、53、63、73の間にガスケット5、15、25、35、45、55、65、75を介在させて接続構成した場合には、シート面がガスケットを介して形成されるため、より優れた気密性が確保され、低い圧力はもとより15〜200MPaという高圧の燃料をより確実にシールすることができる。   The joint structure of the present invention shown in each of the above-described embodiments includes each main rail 1, 11, 21, 31, 41, 51, 61, 71, 81 and each branch branch pipe 3, 13, 23, 33, 43, Since the wetted parts 53, 63, 73 and 83 are formed of stainless steel having corrosion resistance against fuel, Ni plating film or Ni-based alloy plating film or a single layer film of diffusion, the main rail or branch There is no occurrence of rust or the like in the branch pipes, and there is no copper film on the inner peripheral surface, so there is no deterioration of the fuel. Further, gaskets 5, 15, 25, between the respective fittings 2, 12, 22, 32, 42, 52, 62, 72 and the respective branch branches 3, 13, 23, 33, 43, 53, 63, 73 are provided. When the connection structure is formed by interposing 35, 45, 55, 65, and 75, the sheet surface is formed through the gasket, so that excellent airtightness is secured, and a high pressure of 15 to 200 MPa as well as low pressure is secured. The fuel can be sealed more reliably.

また、上記した各実施例における本発明の分岐枝管は、基本的に燃料に対する防錆能に優れる内管と、該内管を保護するように外嵌された外管とからなる二重管で構成され、燃料に対する接液部分は全て内管で覆い、該内管のシート面を含む受圧部等を外管で保護するように支持する構造となっている。従って、高圧で腐食性の強い燃料に直接接触する耐食性素材からなる内管を、剛性の高い鋼材からなる外管によってサポートして、シール面等に対する強固な締着を可能としている。また、分岐枝管と継手金具とのシール面を分岐孔に対する傾斜角を同一のテーパー壁とすることにより、分岐孔の芯合せが容易でかつ該シート面のズレを未然に防止することができ、ガスケットの作用が相まってシーリングがより強固なものとなる。なお、継手金具並びに分岐枝管に形成される上記の傾斜角αは、分岐孔の軸心に対して50〜120°に範囲で任意であるが、例えば自動車用ディーゼルエンジンにおけるインジェクターとポンプをつなぐ噴射管接続頭部の角度である60°程度が好ましい。   Further, the branch branch pipe of the present invention in each of the above-described embodiments is basically a double pipe comprising an inner pipe excellent in rust prevention performance against fuel and an outer pipe fitted to protect the inner pipe. In this structure, all the liquid contact parts with respect to the fuel are covered with the inner pipe, and the pressure receiving part including the seat surface of the inner pipe is protected by the outer pipe. Therefore, the inner pipe made of a corrosion-resistant material that is in direct contact with high-corrosive fuel at high pressure is supported by the outer pipe made of a steel material having high rigidity, and can be firmly fastened to the seal surface or the like. In addition, by making the sealing surface of the branch branch pipe and the fitting fitting into a tapered wall with the same inclination angle with respect to the branch hole, the centering of the branch hole can be easily performed and the sheet surface can be prevented from being misaligned. In addition, the action of the gasket is combined to make the sealing stronger. In addition, although said inclination-angle (alpha) formed in a coupling metal fitting and a branch branch pipe is arbitrary in the range of 50-120 degrees with respect to the axial center of a branch hole, for example, it connects an injector and a pump in an automobile diesel engine. About 60 °, which is the angle of the jet pipe connecting head, is preferable.

さらに、本発明の分岐枝管の製造方法については前記各実施例において示すとおりであるが、切削加工やパンチによる押圧加工、さらには各部材の接合手段等も任意であり、本発明の趣旨に沿うものであれば他のいかなる手段を用いることを妨げない。また、上記各実施例における分岐枝管の内管の防錆処理として、ニッケルめっきもしくはニッケル基合金めっきによる防錆皮膜を例示したが、ニッケル皮膜による第1次防錆処理の上に、Ni−P合金等のニッケル基合金めっき皮膜を施して二層とすることも可能であり、更にその皮膜を加熱して拡散もしくは溶融させて単層とすることもできる。
なお、上記実施例においては実施例1、実施例2、実施例7〜実施例9における分岐枝管の製造方法のみその一例を開示したが、その他の分岐枝管もほぼ同様の簡略な工程によって製造することができるため、比較的少ない工数で燃料に対するる耐食性に優れ、かつ該燃料の劣化を未然に防止し得る分岐枝管を、低コストで製造することができる。
Further, the branch branch pipe manufacturing method of the present invention is as shown in each of the above embodiments, but cutting and pressing with a punch, joining means for each member, etc. are also optional, and within the spirit of the present invention Any other means are acceptable as long as they are in line. In addition, as the rust prevention treatment of the inner pipe of the branch branch pipe in each of the above-described examples, a rust prevention film by nickel plating or nickel base alloy plating is exemplified, but on the primary rust prevention treatment by the nickel film, Ni- A nickel-based alloy plating film such as a P alloy can be applied to form a two-layer, and the film can be further heated to diffuse or melt to form a single layer.
In the above-described embodiment, only one example of the manufacturing method of the branch branch pipe in Examples 1, 2 and 7 to 9 has been disclosed, but the other branch branch pipes are also subjected to substantially the same simple process. Since it can be manufactured, it is possible to manufacture a branch branch pipe that is excellent in corrosion resistance to fuel and that can prevent deterioration of the fuel in a low cost with a relatively small number of steps.

本発明の火花点火もしくは圧縮点火方式の内燃機関用燃料レールにおける分岐枝管の継手構造は、低級ガソリン、サワーガソリン、DME、アルコールおよびアルコール混合燃料、軽油、水素等の使用に十分に耐え、またガソリンの劣化が生じることがない上、低圧はもちろん例え15〜200MPaという高圧の燃料であっても確実にシールすることができる。また、本発明による内燃機関用燃料レールにおける分岐枝管の継手構造は、ガソリン以外の他の高圧燃料や高圧流体や高圧ガス等の配管継手など、幅広い用途に利用が可能である。   The joint structure of the branch branch pipe in the fuel rail for the internal combustion engine of the spark ignition or compression ignition system of the present invention sufficiently withstands the use of lower gasoline, sour gasoline, DME, alcohol and alcohol mixed fuel, light oil, hydrogen, etc. Gasoline is not deteriorated, and even low pressure fuel, such as 15 to 200 MPa, can be reliably sealed. In addition, the joint structure of the branch branch pipe in the fuel rail for an internal combustion engine according to the present invention can be used for a wide range of applications such as high-pressure fuel other than gasoline, piping joints such as high-pressure fluid and high-pressure gas.

本発明の内燃機関用燃料レールにおける分岐枝管の継手構造の第1実施例を示す要部概略縦断面図である。It is a principal part schematic longitudinal cross-sectional view which shows 1st Example of the joint structure of the branch branch pipe in the fuel rail for internal combustion engines of this invention. 同じく第2実施例を示す要部概略縦断面図である。It is a principal part schematic longitudinal cross-sectional view which similarly shows 2nd Example. 同じく第3実施例を示す要部概略縦断面図である。It is a principal part schematic longitudinal cross-sectional view which similarly shows 3rd Example. 同じく第4実施例を示す要部概略縦断面図である。It is a principal part schematic longitudinal cross-sectional view which similarly shows 4th Example. 同じく第5実施例を示す要部概略縦断面図である。It is a principal part schematic longitudinal cross-sectional view which similarly shows 5th Example. 同じく第6実施例を示す要部概略縦断面図である。It is a principal part schematic longitudinal cross-sectional view which similarly shows 6th Example. 同じく第7実施例を示す要部概略縦断面図である。It is a principal part schematic longitudinal cross-sectional view which similarly shows 7th Example. 同じく第8実施例を示す要部概略縦断面図である。It is a principal part schematic longitudinal cross-sectional view which similarly shows 8th Example. 同じく第9実施例を示す要部概略縦断面図である。It is a principal part schematic longitudinal cross-sectional view which similarly shows 9th Example. 本発明の内燃機関用燃料レールにおける分岐枝管の製造方法の第1実施例を概略的に示す工程図である。It is process drawing which shows schematically the 1st Example of the manufacturing method of the branch branch pipe in the fuel rail for internal combustion engines of this invention. 同じく分岐枝管の製造方法の第2実施例を概略的に示す工程図である。It is process drawing which shows schematically the 2nd Example of the manufacturing method of a branched branch pipe similarly. 同じく分岐枝管の製造方法の第3実施例を概略的に示す半截工程図である。FIG. 5 is a semi-finished process diagram schematically showing a third embodiment of the branch branch pipe manufacturing method. 同じく分岐枝管の製造方法の第4実施例を概略的に示す半截工程図である。FIG. 10 is a half-finished process diagram schematically showing a fourth embodiment of the method for manufacturing a branch branch pipe. 同じく分岐枝管の製造方法の第5実施例を概略的に示す工程図である。It is process drawing which shows schematically the 5th Example of the manufacturing method of a branched branch pipe similarly. 図14の第5実施例における成形前の二重金属管の他の管端部を示す断面図である。It is sectional drawing which shows the other pipe | tube end part of the double metal pipe before shaping | molding in 5th Example of FIG. 同じく図14の第5実施例により製造される分岐枝管の変形例を示す要部断面図である。FIG. 15 is a cross-sectional view of a principal part showing a modification of the branch branch pipe manufactured according to the fifth embodiment of FIG. 14.

符号の説明Explanation of symbols

1、11、21、31、41、51、61、71、81 本管レール
2、12、22、32、42、52、62、72、82 継手金具
3、13、23、33、43、53、63、73、83 分岐枝管
4、14、24、34、44、54、64、74、84 締結用ナット
5、15、25、35、45、55、65、75 ガスケット

1, 11, 21, 31, 41, 51, 61, 71, 81 Main rail 2, 12, 22, 32, 42, 52, 62, 72, 82 Joint fitting 3, 13, 23, 33, 43, 53 63, 73, 83 Branch branch pipes 4, 14, 24, 34, 44, 54, 64, 74, 84 Nut for fastening 5, 15, 25, 35, 45, 55, 65, 75 Gasket

Claims (24)

ステンレス鋼製もしくは少なくとも内面に防錆処理が施された鋼製の内燃機関用燃料レールと、外管とその内周面が該外管の外周面より燃料に対する防錆能が優れた内管とからなる二重管で構成された分岐枝管とを、継手金具を介して締結用ナットにより接続構成してなる継手構造において、前記分岐枝管と継手金具の接続シール部が、当該分岐枝管内周面と同等の防錆能を有すると共に、該分岐枝管の燃料に対するシール面を含む接液部分の全てが前記内管によって覆われ、該シール面を含む内管の受圧部を前記外管によって支持するよう構成されていることを特徴とする内燃機関用燃料レールにおける分岐枝管の継手構造。 A fuel rail for an internal combustion engine made of stainless steel or steel having at least an inner surface subjected to rust prevention, and an outer tube and an inner tube whose inner peripheral surface is more rust-proof against fuel than the outer peripheral surface of the outer tube; In a joint structure in which a branch branch pipe composed of a double pipe made of is connected by a fastening nut via a joint fitting, a connection seal portion between the branch branch pipe and the joint fitting is provided in the branch branch pipe. All of the wetted parts including the sealing surface with respect to the fuel of the branch branch pipe are covered with the inner pipe, and the pressure receiving portion of the inner pipe including the sealing surface is used as the outer pipe. A joint structure of a branch branch pipe in a fuel rail for an internal combustion engine, which is configured to be supported by 前記継手金具の接続シール部を、該継手金具の分岐孔軸に直角な平坦面を有する断面凹形状とし、前記外管の開口端面を前記内管の開口端部で覆うようにして折り曲げ、該内管の内周面がシート面となるように形成した分岐枝管を、予め該分岐枝管に組込んだ締結用ナットにより、接続構成したことを特徴とする請求項1に記載の内燃機関用燃料レールにおける分岐枝管の継手構造。 The connection seal part of the joint fitting has a concave cross section having a flat surface perpendicular to the branch hole axis of the joint fitting, and is bent so that the opening end surface of the outer pipe is covered with the opening end of the inner pipe. 2. The internal combustion engine according to claim 1, wherein the branch branch pipe formed so that the inner peripheral surface of the inner pipe becomes a seat surface is connected by a fastening nut incorporated in the branch branch pipe in advance. Of branch branch pipes in fuel rails for automobiles. 前記継手金具の接続シール部と分岐枝管のシート面との間にガスケットを介在させ、予め該分岐枝管に組込んだ前記締結用ナットにより、接続構成したことを特徴とする請求項1または2に記載の内燃機関用燃料レールにおける分岐枝管の継手構造。 The gasket is interposed between the connection seal portion of the joint fitting and the seat surface of the branch branch pipe, and the connection is configured by the fastening nut that is incorporated in the branch branch pipe in advance. The joint structure of the branch branch pipe in the fuel rail for internal combustion engines according to 2. 前記分岐枝管の端末にスプールまたは突起を設け、締結用ナットの受圧部としたことを特徴とする請求項1〜3のいずれか1項に記載の内燃機関用燃料レールにおける分岐枝管の継手構造。 The joint of the branch branch pipe in the fuel rail for an internal combustion engine according to any one of claims 1 to 3, wherein a spool or a protrusion is provided at a terminal of the branch branch pipe to be a pressure receiving portion of a fastening nut. Construction. 前記継手金具の接続シール部を円錐凸形状とし、前記分岐枝管のシート面をシングルフレアー形状とし、該円錐凸形状の接続シール部と該シングルフレアー形状のシート面との間にリング状円錐ガスケットを介在させ、予め分岐枝管に組込んだ締結用ナットにより、接続構成したことを特徴とする請求項1に記載の内燃機関用燃料レールにおける分岐枝管の継手構造。 The connection seal part of the joint fitting has a conical convex shape, the sheet surface of the branch branch pipe has a single flare shape, and a ring-shaped conical gasket is provided between the conical convex connection seal part and the single flare sheet surface. 2. The joint structure of a branch branch pipe in a fuel rail for an internal combustion engine according to claim 1, wherein the connection is made by a fastening nut preliminarily incorporated in the branch branch pipe. 前記継手金具の接続シール部を円錐凹形状とし、前記分岐枝管のシート面をシングルフレアー形状とし、前記円錐凹形状の接続シール部と前記シングルフレアー形状のシート面との間に算盤玉形ガスケットを介在させ、予め分岐枝管に組込んだ締結用ナットにより、接続構成したことを特徴とする請求項1に記載の内燃機関用燃料レールにおける分岐枝管の継手構造。 The connection seal part of the joint fitting has a conical concave shape, the sheet surface of the branch branch pipe has a single flare shape, and an abacus bead gasket between the conical concave shape connection seal part and the single flare shape sheet surface 2. The joint structure of a branch branch pipe in a fuel rail for an internal combustion engine according to claim 1, wherein the connection is made by a fastening nut preliminarily incorporated in the branch branch pipe. 前記継手金具の接続シール部に、分岐孔の軸芯に対する傾斜角αを有する凹状のテーパー面を形成し、前記分岐枝管の外管の接続頭部を、前記継手金具の接続シール部における傾斜角αを有する凹状のテーパー面に対応して、傾斜角α±5°を有する凸状のテーパー壁を有する形状とし、該凸状のテーパー壁を有する外管の接続頭部を覆うように内管の先端を外側に折り曲げてリング状のシート面を形成し、該シート面と前記継手金具のテーパー面との間に略リング形状の円錐ガスケットを介在させ、予め前記分岐枝管に組込んだ締結用ナットにより、接続構成したことを特徴とする請求項1に記載の内燃機関用燃料レールにおける分岐枝管の継手構造。 A concave tapered surface having an inclination angle α with respect to the axis of the branch hole is formed in the connection seal portion of the joint fitting, and the connection head portion of the outer pipe of the branch branch pipe is inclined at the connection seal portion of the joint fitting. Corresponding to the concave tapered surface having an angle α, the shape has a convex tapered wall having an inclination angle α ± 5 °, and the inner side is covered so as to cover the connecting head of the outer pipe having the convex tapered wall. A pipe-like sheet surface is formed by bending the tip of the pipe outward, and a substantially ring-shaped conical gasket is interposed between the sheet surface and the tapered surface of the joint fitting, and is assembled in advance in the branch branch pipe. The joint structure of the branch branch pipe in the fuel rail for an internal combustion engine according to claim 1, wherein the connection structure is constituted by a fastening nut. 前記傾斜角αが継手金具の分岐孔の軸心に対して50〜120°であることを特徴とする請求項7に記載の内燃機関用燃料レールにおける分岐枝管の継手構造。 The joint structure of a branch branch pipe in a fuel rail for an internal combustion engine according to claim 7, wherein the inclination angle α is 50 to 120 ° with respect to the axis of the branch hole of the joint fitting. 前記分岐枝管の接続頭部の先端形状が、該分岐枝管の軸心に対してほぼ直角に形成され、該接続頭部を覆う内管のシート面が、折り返し二重構造のテーパー壁面に形成されることを特徴とする請求項7または8に記載の内燃機関用燃料レールにおける分岐枝管の継手構造。 The tip of the connection head of the branch branch pipe is formed substantially perpendicular to the axis of the branch branch pipe, and the seat surface of the inner pipe covering the connection head is a tapered double wall taper wall surface. The joint structure of the branch branch pipe in the fuel rail for internal combustion engines according to claim 7 or 8, wherein the joint structure is formed. ステンレス鋼製もしくは少なくとも内面に防錆処理が施された鋼製の内燃機関用燃料レールと、外管とその内周面が外管の外周面より燃料に対する防錆能が優れた内管とからなる二重管で構成された分岐枝管とを、継手金具を介して締結用ナットにより接続構成してなる継手構造において、前記継手金具の接続シール部が平坦面となし、前記分岐枝管の端末部に拡径部を設けてその外周面に受圧部を形成し、それに連なる接続頭部のシート面と、前記継手金具の平坦面との間にガスケットを介在させ、予め分岐枝管側に組込んだワッシャに形成した押圧座面部を、前記分岐枝管の拡径部の外周面に形成された受圧部に当接係合させ、締結用ナットにより接続構成したことを特徴とする内燃機関用燃料レールにおける分岐枝管の継手構造。 A fuel rail for an internal combustion engine made of stainless steel or steel having at least an inner surface subjected to rust prevention, and an outer tube and an inner tube whose inner peripheral surface is more rust-proof against fuel than the outer peripheral surface of the outer tube In the joint structure formed by connecting the branch branch pipe constituted by the double pipe with the fastening nut through the joint fitting, the connection seal portion of the joint fitting is a flat surface, and the branch branch pipe An enlarged diameter portion is provided in the terminal portion, a pressure receiving portion is formed on the outer peripheral surface thereof, and a gasket is interposed between the seat surface of the connecting head connected to the end portion and the flat surface of the joint fitting, An internal combustion engine characterized in that a pressing seat surface portion formed on an incorporated washer is brought into contact with and engaged with a pressure receiving portion formed on an outer peripheral surface of the enlarged diameter portion of the branch branch pipe, and is connected by a fastening nut. Of branch branch pipes in fuel rails for automobiles. ステンレス鋼製もしくは少なくとも内面に防錆処理が施された鋼製の内燃機関用燃料レールと、接続端部に相手座部への押圧面となす截頭円錐状、もしくは円弧状あるいは算盤珠状の接続頭部を有し、かつ軸芯内部の流通孔の孔周面全長にわたって薄肉からなるステンレス製の内管を密嵌状に内装して形成してなる分岐枝管とを、継手金具を介して締結用ナットにより接続構成してなる継手構造において、前記接続頭部の先端部を覆うように前記ステンレス製の内管の先端部を外側に折り曲げてシート面を形成し、該シート面と前記継手金具の受圧面とを当接係合させ、締結用ナットにより接続構成したことを特徴とする内燃機関用燃料レールにおける分岐枝管の継手構造。 A fuel rail for internal combustion engines made of stainless steel or steel with at least the inner surface treated with rust prevention, and a frustoconical shape that forms a pressing surface to the mating seat at the connection end, or an arc shape or an abacus shape A branch branch pipe that has a connecting head and is formed by tightly fitting an inner pipe made of stainless steel over the entire circumference of the circulation hole inside the shaft core in a close-fitting manner. In the joint structure formed by connecting with the fastening nut, a front end portion of the stainless steel inner tube is bent outward so as to cover the front end portion of the connection head, and a sheet surface is formed. A joint structure of a branch branch pipe in a fuel rail for an internal combustion engine, wherein the pressure receiving surface of the joint fitting is brought into contact with and engaged with a fastening nut. 前記接続頭部の先端部を覆うステンレス製の内管の外側折り曲げ部は、当該接続頭部の先端部と面一となるように当該接続頭部に埋設してシート面を形成したことを特徴とする請求項11に記載の内燃機関用燃料レールにおける分岐枝管の継手構造。 The outer bent portion of the stainless steel inner tube that covers the tip of the connection head is embedded in the connection head so as to be flush with the tip of the connection head to form a sheet surface. The joint structure of the branch branch pipe in the fuel rail for internal combustion engines according to claim 11. 内燃機関用燃料レールの継手構造における分岐枝管において、外管と内管とからなる二重管で構成され、かつ内管がステンレス鋼管または内周面に防錆皮膜が施された管体からなり、該内管の内周面がシート面となるように外管の開口端面を内管開口端部で覆った構造となし、燃料に対するシール面を含む接液部分の全てが、前記内管によって覆われ、かつ該内管の受圧部が前記外管によって支持され、さらに端末部に締結用ナットの受圧部としてのスプールまたは突起が設けられたことを特徴とする内燃機関用燃料レールにおける分岐枝管。 The branch branch pipe in the joint structure of the fuel rail for an internal combustion engine is composed of a double pipe composed of an outer pipe and an inner pipe, and the inner pipe is a stainless steel pipe or a pipe body having a rust-proof coating on the inner peripheral surface. The inner tube has a structure in which the opening end surface of the outer tube is covered with the inner tube opening end so that the inner peripheral surface of the inner tube becomes a seat surface. And a pressure receiving portion of the inner tube is supported by the outer tube, and a spool or a protrusion as a pressure receiving portion of a fastening nut is provided at the terminal portion, and the branch in the fuel rail for an internal combustion engine Branch pipe. 前記内管の防錆皮膜が、Niめっき皮膜もしくはNi基合金皮膜、またはNiめっき皮膜とNi−P合金めっき皮膜の複層もしくは拡散した単層の皮膜で構成されていることを特徴とする請求項13に記載の内燃機関用燃料レールにおける分岐枝管。 The anticorrosive film of the inner pipe is composed of a Ni plating film or a Ni-based alloy film, or a multilayer of a Ni plating film and a Ni-P alloy plating film or a diffused single layer film. Item 14. A branch branch pipe in a fuel rail for an internal combustion engine according to Item 13. 外管と内管とからなる二重管の当該外管、内管の両方を同時に管軸方向にパンチで押し込むことにより、ナットの受圧部としてのスプールまたは突起を外管と内管で形成し、次いで接続端部側の外管の管端部を切除して内管の管端部を突出させ、しかる後、当該内管の前記突出部を外側に折り曲げて外管の接続端部側管端面を覆うと共に、該内管の内周面でシート面を形成することを特徴とする内燃機関用燃料レールにおける分岐枝管の製造方法。 A spool or protrusion as a pressure receiving part of the nut is formed by the outer tube and the inner tube by simultaneously pressing both the outer tube and the inner tube of the double tube composed of the outer tube and the inner tube with a punch in the tube axis direction. Then, the tube end portion of the outer tube on the connection end side is cut out to project the tube end portion of the inner tube, and then the projecting portion of the inner tube is bent outward to connect the tube to the connection end portion side of the outer tube. A method for manufacturing a branch branch pipe in a fuel rail for an internal combustion engine, wherein an end face is covered and a seat face is formed by an inner peripheral face of the inner pipe. 外管と内管とからなる二重管の当該外管のみを管軸方向にパンチで押し込むことにより、締結用ナットの受圧部としてのスプールまたは突起を外管のみで形成し、次いで該外管の接続側管端より突出している内管の突出部を外側に拡径しながら折り曲げ、該外管の接続側管端面を覆うと共に、該内管の内周面でシート面を形成することを特徴とする内燃機関用燃料レールにおける分岐枝管の製造方法。 By pressing only the outer pipe of the double pipe composed of the outer pipe and the inner pipe with a punch in the pipe axis direction, a spool or a projection as a pressure receiving portion of the fastening nut is formed only by the outer pipe, and then the outer pipe Bending the protruding portion of the inner pipe projecting from the connection side pipe end while expanding the diameter outward, covering the connection side pipe end surface of the outer pipe, and forming a sheet surface on the inner peripheral surface of the inner pipe A method of manufacturing a branch branch pipe in a fuel rail for an internal combustion engine, which is characterized. 外管と内管とからなる二重管の当該外管のみを管軸方向にパンチで押し込むことにより、締結用ナットの受圧部としてのスプールまたは突起を外管のみで形成し、前記外管の接続頭部を前記継手金具の接続シール部に形成される傾斜角αの凹状のテーパー面に対応して、同様の傾斜角に加工することにより傾斜角αのテーパー壁を有する接続頭部を形成し、次いで外管の接続側管端より突出している内管の突出部を外側に拡径しながら折り曲げ、該外管の接続側管端面を覆うと共に該内管の内周面で、傾斜角α±5°の凸状のテーパー壁を有するシート面を形成することを特徴とする内燃機関用燃料レールにおける分岐枝管の製造方法。 By pushing only the outer pipe of the double pipe composed of the outer pipe and the inner pipe with a punch in the pipe axis direction, a spool or a projection as a pressure receiving portion of the fastening nut is formed only by the outer pipe, and the outer pipe A connection head having a tapered wall with an inclination angle α is formed by processing the connection head into a similar inclination angle corresponding to a concave tapered surface with an inclination angle α formed on the connection seal portion of the joint fitting. Then, the protruding portion of the inner pipe protruding from the connection side pipe end of the outer pipe is bent while expanding the diameter outward, covering the connection side pipe end surface of the outer pipe, and at the inner peripheral surface of the inner pipe, the inclination angle A method of manufacturing a branch branch pipe in a fuel rail for an internal combustion engine, comprising forming a seat surface having a convex tapered wall of α ± 5 °. 前記傾斜角αが前記継手金具の分岐孔の軸心に対して50〜120°であることを特徴とする請求項17に記載の内燃機関用燃料レールにおける分岐枝管の製造方法。 18. The method for manufacturing a branch branch pipe in a fuel rail for an internal combustion engine according to claim 17, wherein the inclination angle α is 50 to 120 ° with respect to the axis of the branch hole of the joint fitting. 前記外管の接続頭部に形成される傾斜角αのテーパー壁が、機械的手段による切削によって形成されることを特徴とする請求項17または18に記載の内燃機関用燃料レールにおける分岐枝管の製造方法。 19. A branch branch pipe in a fuel rail for an internal combustion engine according to claim 17 or 18, wherein a tapered wall having an inclination angle α formed at a connection head portion of the outer pipe is formed by cutting by mechanical means. Manufacturing method. 前記外管の接続頭部が分岐枝管の管軸に対してほぼ直角に形成され、該外管の接続頭部を覆う内管が、折り返し二重構造のテーパー壁面に形成されることを特徴とする請求項19に記載の内燃機関用燃料レールにおける分岐枝管の製造方法。 The connecting head of the outer pipe is formed substantially perpendicular to the tube axis of the branch pipe, and the inner pipe covering the connecting head of the outer pipe is formed on a tapered double wall taper wall surface. A method for manufacturing a branch branch pipe in a fuel rail for an internal combustion engine according to claim 19. 接続端部に相手座部への押圧面となす截頭円錐状、もしくは円弧状あるいは算盤珠状の接続頭部を有し、かつ軸芯内部の流通孔の孔周面全長にわたって薄肉からなるステンレス製の内管を密嵌状に内装し、前記接続頭部の先端部を覆うように前記ステンレス製の内管の先端部を外側に折り曲げてシート面を形成してなる分岐枝管の製造方法であって、軸芯内部の流通孔の孔周面全長にわたって薄肉からなるステンレス製の内管を密嵌状に内装した管体の外管のみを管軸方向にパンチで押し込むことにより前記接続頭部を成形すると同時に前記内管を突出させ、次いで外管の接続側管端より突出している前記内管の突出部を外側に拡径しながら折り曲げ、該外管の接続頭部の先端部を覆うと共に該内管の内周面でシート面を形成することを特徴とする内燃機関用燃料レールにおける分岐
枝管の製造方法。
Stainless steel with a frustoconical or arcuate or abacus bead-shaped connecting head that serves as a pressing surface for the mating seat at the connecting end and is thin over the entire circumference of the flow hole inside the shaft core A method of manufacturing a branch branch pipe, in which an inner pipe made of steel is tightly fitted and a sheet surface is formed by bending the tip of the stainless steel inner pipe outward so as to cover the tip of the connection head The connecting head is formed by pressing only the outer tube of a tubular body in which a stainless steel inner tube made of a thin wall is tightly fitted over the entire length of the circumferential surface of the flow hole inside the shaft core with a punch in the tube axis direction. The inner tube is projected at the same time as the portion is molded, and then the protruding portion of the inner tube protruding from the connection side tube end of the outer tube is bent outwardly, and the tip of the connection head of the outer tube is bent. A sheet surface is formed on the inner peripheral surface of the inner tube while covering Method for producing a branched branch pipe in the fuel rail for an internal combustion engine to be.
前記接続頭部を形成する工程において、前記外管を長く、前記内管を短く管軸方向にパンチで押し込むことを特徴とする請求項21に記載の内燃機関用燃料レールにおける分岐枝管の製造方法。 22. The manufacturing of a branch branch pipe in a fuel rail for an internal combustion engine according to claim 21, wherein, in the step of forming the connection head, the outer pipe is lengthened and the inner pipe is shortly pushed by a punch in a pipe axis direction. Method. 前記内管の突出部を外側に拡径しながら折り曲げてシート面を形成する工程において、ステンレス製の内管内に芯金を挿入して前記内管の突出部を外側に拡径しながら折り曲げることを特徴とする請求項21または22に記載の内燃機関用燃料レールにおける分岐枝管の製造方法。 In the step of forming the sheet surface by bending the projecting portion of the inner tube outwardly, the core metal is inserted into the stainless steel inner tube and bent while the projecting portion of the inner tube is expanded outwardly. 23. A method of manufacturing a branch branch pipe in a fuel rail for an internal combustion engine according to claim 21 or 22. 前記接続頭部の先端部を覆うステンレス製の内管の外側折り曲げ部が当該接続頭部の先端部と面一となるように前記内管の突出部を当該接続頭部に埋設させてシート面を形成することを特徴とする請求項21乃至23のいずれか1項に記載の内燃機関用燃料レールにおける分岐枝管の製造方法。

The sheet surface is formed by embedding the protruding portion of the inner pipe in the connecting head so that the outer bent portion of the stainless steel inner pipe covering the tip of the connecting head is flush with the tip of the connecting head. The method for manufacturing a branch branch pipe in a fuel rail for an internal combustion engine according to any one of claims 21 to 23, wherein:

JP2005157023A 2004-06-17 2005-05-30 Joint structure of branch branch pipe in fuel rail for internal combustion engine, branch branch pipe, and manufacturing method of the branch branch pipe Expired - Fee Related JP4433306B2 (en)

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