JP4046334B2 - Connection structure of branch connection for common rail - Google Patents

Connection structure of branch connection for common rail Download PDF

Info

Publication number
JP4046334B2
JP4046334B2 JP2003174009A JP2003174009A JP4046334B2 JP 4046334 B2 JP4046334 B2 JP 4046334B2 JP 2003174009 A JP2003174009 A JP 2003174009A JP 2003174009 A JP2003174009 A JP 2003174009A JP 4046334 B2 JP4046334 B2 JP 4046334B2
Authority
JP
Japan
Prior art keywords
branch
washer
sleeve
connection body
connection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2003174009A
Other languages
Japanese (ja)
Other versions
JP2005009394A (en
Inventor
信夫 加藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Usui Co Ltd
Original Assignee
Usui Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Usui Co Ltd filed Critical Usui Co Ltd
Priority to JP2003174009A priority Critical patent/JP4046334B2/en
Publication of JP2005009394A publication Critical patent/JP2005009394A/en
Application granted granted Critical
Publication of JP4046334B2 publication Critical patent/JP4046334B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L41/00—Branching pipes; Joining pipes to walls
    • F16L41/08—Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of the wall or to the axis of another pipe
    • F16L41/14—Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of the wall or to the axis of another pipe by screwing an intermediate part against the inside or outside of the wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、一般にディーゼル内燃機関における蓄圧式燃料噴射システムに使用される高圧燃料多岐管等のようなコモンレールにおける分岐枝管もしくは分岐金具等による分岐接続体の接続構造に関する。
【０００２】
【従来の技術】
従来、この種の分岐接続体の接続構造として図３に示すものがある（特許文献１参照）。この分岐接続体の接続構造は、円形パイプからなる本管レール１１側の周壁部に設けた内部の流通路１１−１に通ずる分岐孔１１−２部に外方に開口する受圧座面１１−３が形成され、該受圧座面付近の本管レール１１の外周壁に筒状のスリーブニップル１３が溶接またはろう付けにより取着され、前記流通路１１−１に通ずる流路１２−１を有する分岐接続体１２の先端部に設けた接続頭部１２−２のなす押圧座面１２−３を前記受圧座面１１−３に当接係合せしめ、予め分岐接続体側に外嵌固着したスリーブワッシャ１５に外装された締付け用袋ナット１４を前記スリーブニップル１３に螺合することにより、前記接続頭部１２−２首下での押圧に伴って締着して分岐接続体１２を接続する方式となっている。
すなわち、この分岐接続体の接続構造は、分岐接続体１２に外嵌固着したスリーブワッシャ１５にて当該分岐接続体１２に作用する軸力による挫屈や変形を防止し、シールと噴射圧の安定性を確保したものである。
【０００３】
【特許文献１】
特開２００１−８２６６４号公報
【０００４】
【発明が解決しようとする課題】
しかしながら、このような従来の分岐接続体の接続構造においては、図示のようにスリーブニップル１３の管軸と本管レール１１の受圧座面１１−３の中心とが一致するように当該スリーブニップル１３が本管レール１１の外周壁に取着されているときは高いシール性を得ることができるが、スリーブニップル１３の中心がずれて本管レール１１に取着されているときは、締付け用袋ナット１４による分岐接続体のシール力の低下やシート部の変形によりシールが不十分となるという問題があった。また、分岐接続体の直線性にばらつきがあったり、分岐接続体の管軸と相手取付軸が一致しないで僅かに傾斜した場合にもシールが不十分となるという問題があった。
【０００５】
本発明は、上記した従来の問題を解決するためになされたものであり、スリーブニップルの中心がずれて本管レールに取着されているときでも、また分岐接続体の管軸と相手取付軸が一致していないで僅かに傾斜したときでも高シール性を確保できるコモンレール用分岐接続体の接続構造を提供しようとするものである。
【０００６】
【課題を解決するための手段】
本発明に係るコモンレール用分岐接続体の接続構造は、その軸芯方向内部に流通路を有する本管レールの軸方向の周壁部に間隔を保持して設けた分岐孔の周面部に形成した外方へ開口する受圧座面を囲むように、当該受圧座面と同心に筒状のスリーブニップルを溶接またはろう付けにより本管レールに取着し、前記流通路に通ずる流路を有する分岐接続体の端部に設けた接続頭部のなす押圧座面部を前記受圧座面に当接係合せしめ、予め分岐接続体側に外嵌したスリーブワッシャに外装した締付け用袋ナットを前記スリーブニップルに螺合することにより、前記接続頭部首下での押圧に伴って締着して分岐接続体を接続する方式のコモンレール用分岐接続体の接続構造において、前記スリーブワッシャをフランジ付きワッシャとフランジなしワッシャとからなる二分割構造として両ワッシャをその当接面で相互に横ずれ可能に分岐接続体に外嵌し、かつ該フランジ付きスリーブワッシャの内径を分岐接続体の外径より僅かに大径となし、前記スリーブニップルの基部と反対側開口部の内径を前記二分割構造のスリーブワッシャの外径より僅かに大径となしたことを特徴とするものである。
また、前記フランジなしワッシャが接続頭部首下に圧嵌された構成となしたことを特徴とし、さらに、前記フランジ付きワッシャのフランジ部背面を球面もしくはテーパ面となし、該球面もしくはテーパ面と接する前記締付け用袋ナットの内面を当該球面と同一曲率半径の湾曲面または、テーパ面となしたことを特徴とするものである。
【０００７】
本発明において、スリーブワッシャを二分割構造として両ワッシャをその当接面で相互に横ずれ可能に分岐接続体に外嵌したのは、スリーブニップルの中心がずれて本管レールに取着されているときに、そのずれを吸収できるようにするためである。また、フランジなしワッシャを接続頭部首下に圧嵌したのは、配管接続時に袋ナットを過大に締付けた場合に、その過大な締付けトルクで生じる軸力を吸収し、ワッシャの変形を防止するとともに座屈強度が向上し、かつ曲げ疲労強度も向上するためである。さらに、締付け用袋ナットの内面と接するスリーブワッシャ背面を球面となし、該球面と接する前記締付け用袋ナットの内面を湾曲面またはテーパ面としたのは、分岐接続体の管軸と相手取付軸が一致していないときでも、該スリーブワッシャの背面と締付け用袋ナットの接触部の面圧を常に均一に保持するためである。
【０００８】
【発明の実施の形態】
図１は本発明に係るコモンレール用分岐接続体の接続構造の一実施例を示す縦断面図、図２は同じくコモンレール用分岐接続体の接続構造の他の実施例を示す縦断面図であり、１は本管レール、２は分岐接続体、３はスリーブニップル、４は締付け用袋ナット、５−１、５−２は二分割構造のスリーブワッシャ、６、７は隙間である。
【０００９】
コモンレールとしての本管レール１は、例えば直径２８ｍｍ、肉厚９ｍｍの、比較的厚肉の管状部を有するような材質ＳＴＳ４８相当の高圧配管用の鋼管であって、その軸芯内部を流通路１−１となしている。
【００１０】
本管レール１と別体のスリーブニップル３を有するコモンレールの場合は、前加工工程において、この本管レール１の外周壁に、外周面に分岐接続体２側に組込まれる締付け用袋ナット４と螺合する螺子面３−１を設けたスリーブニップル３を継手金具となしてその基端部を直接溶接またはろう付けして取付ける。このスリーブニップル３の基端部と反対側の開口部は、二分割構造のスリーブワッシャ５−１、５−２の外周面との間に隙間７ができるように、該スリーブワッシャの外径より大径となしている。続いて、仕上加工工程において、本管レール１の前記スリーブニップル３で囲まれた部分に当該本管レール１の流通路１−１に通じ該流通路に連通する円形の外方に開口する周面を受圧座面１−３となす分岐孔１−２を形成する。
【００１１】
一方、分岐接続体２は、分岐枝管あるいは分岐金具からなるものであって、その内部に本管レール１の流通路１−１に通ずる流路２−１を有してその端部に例えば球面状の先端シール面に連設した先細円錐状の挫屈成形による拡径した接続頭部２−２のなす押圧座面２−３を設けてなる。
【００１２】
二分割構造のスリーブワッシャは、フランジ付きワッシャ５−１とフランジなしワッシャ５−２とからなり、図１に示す接続構造は、締付け用袋ナット４の内面とフランジ付きワッシャ５−１の背面は互いに平坦面接触となっており、かつその内径は分岐接続体２の外径より僅かに大径となしている。
一方、図２に示す接続構造は、フランジ付きワッシャ５−１のフランジ部背面を球面もしくはテーパ面５−１ａとなし、かつ内径は前記と同様分岐接続体２の外径より僅かに大径となしている。そして、このフランジ付きワッシャ５−１の球面もしくはテーパ面５−１ａと接する締付け用袋ナット４の内面をテーパ面または該球面と同一曲率半径もしくは僅かに大きな曲率半径の湾曲面４−１として、フランジ付きワッシャ５−１の背面と締付け用袋ナット４の内面とを好ましくは球面接触させて圧嵌せしめるものである。
６はフランジ付きワッシャ５−１の内面と分岐接続体２の外面との間に設けた隙間である。
また、フランジなしワッシャ５−２には、前記分岐接続体２の接続頭部２−２の首下部外周面を覆う段付き拡径部５−２ａが設けられ、該ワッシャの段付き拡径部側端面に前記接続頭部２−２の最大径部を被せた構造となっている（特開２００２−５４７７０号公報参照）が、この形状に限定されるものではない。
【００１３】
なお上記スリーブワッシャ５−１、５−２の材質は、本管レール１と同一材質またはそれ以上の強度を有するものが好ましく、例えばＳ４５Ｃ、ＳＣＭ４３５などの硬質材を使用することができる。
【００１４】
図１に示す本発明の分岐接続体２の接続構造は、分岐接続体２側の接続頭部２−２のなす押圧座面２−３を本管レール１側の受圧座面１−３に当接係合せしめ、予め分岐接続体２側に二分割構造のスリーブワッシャ５−１、５−２に外装した締付け用袋ナット４を前記スリーブニップル３に螺合することにより、前記接続頭部２−２首下での締付け用袋ナット４を介したスリーブワッシャ５−１、５−２の押圧に伴って締着して接続構成するものである。
ここで図１に示す接続構造は、スリーブワッシャがフランジ付きワッシャ５−１とフランジなしワッシャ５−２とから構成された二分割構造となっており、かつフランジ付きワッシャ５−１の内面と分岐接続体２の外面との間と、該スリーブワッシャ５−１、５−２とスリーブニップル３との間にそれぞれ隙間６、７が設けられているため、スリーブニップル３の中心がずれて本管レールに取着されていても、フランジ付きワッシャ５−１とフランジなしワッシャ５−２の当接面でそのずれ（横ずれ）を吸収することができ、分岐接続体２に作用する軸力を損失することなくシート面に均一に伝達することができる。
また、図２に示す接続構造は、締付け用袋ナット４の内面とフランジ付きワッシャ５−１の背面とを球面接触、テーパ面接触、あるいは球面とテーパ面接触させたことにより、前記図１に示す接続構造の作用効果に加えて、ナット締め付け時において何らかの原因で分岐接続体２が本管レールの分岐孔１−２の軸芯に対して僅かに傾いたり偏心したりしても、フランジ付きワッシャ５−１の背面と締付け用袋ナット４の接触部は常に均一な面圧を保持して十分なスラスト力を発生させ、シール面もむらのない均一な面圧分布でシールされる。
【００１５】
さらに、図１、図２に示す接続構造の場合は、分岐接続体２の接続頭部２−２の首下部外周面を覆うスリーブワッシャに段付き拡径部５−２ａを設けたことにより分岐接続体２の内圧疲労強度を確保できる上、分岐接続体２のスリーブワッシャ５−１、５−２を外嵌する部分の肉厚を厚肉とすることにより曲げ疲労強度を確保できる。
【００１６】
なおここでは、レール１とスリーブニップル３が別体のもので説明したが、スリーブニップルがレールと一体のものであっても、シート面１−３とスリーブ部のねじ３−１の加工時に芯ずれが生じた場合等に本発明が有効であることはいうまでもない。
【００１７】
【発明の効果】
以上説明したごとく、本発明に係るコモンレール用分岐接続体の接続構造は、スリーブニップルを溶接またはろう付けにより本管レールに取着し、該スリーブニップルに螺合する袋ナットを締着して分岐接続体を接続する構造において、予め分岐接続体の外周に嵌合するスリーブワッシャを二分割構造とし、かつ該ワッシャの背面と締付け用袋ナットの内面とを球面接触、テーパ面接触、あるいは球面対テーパ面接触としたことにより、スリーブニップルの中心がずれて本管レールに取着されていても、分岐接続体に作用する軸力を損失することなくシート面に均一に伝達することができるという効果が得られる。また、分岐接続体が本管レールの分岐孔の軸芯に対して僅かに傾いたり偏心したりしても、スリーブワッシャの背面と締付け用袋ナットの接触部の面圧を常に均一に保持することができるので、高シール性を確保できるという優れた効果を奏する。
【図面の簡単な説明】
【図１】本発明に係るコモンレール用分岐接続体の接続構造の一実施例を示す縦断面図である。
【図２】本発明に係るコモンレール用分岐接続体の接続構造の他の実施例を示す縦断面図である。
【図３】この発明の対象とする従来のコモンレール用分岐接続体の接続構造例を示す縦断面図である。
【符号の説明】
１ 本管レール
１−１ 流通路
１−２ 分岐孔
１−３ 受圧座面
２ 分岐接続体
２−１ 流路
２−２ 接続頭部
２−３ 押圧座面
３ スリーブニップル
３−１ 螺子面
４ 締付け用袋ナット
５−１ フランジ付きワッシャ
５−１ａ 球面もしくはテーパ面
５−２ フランジなしワッシャ
５−２ａ 段付き拡径部
６、７ 隙間[0001]
BACKGROUND OF THE INVENTION
The present invention generally relates to a connection structure of a branch connection body such as a branch branch pipe or a branch fitting in a common rail such as a high pressure fuel manifold used in an accumulator fuel injection system in a diesel internal combustion engine.
[0002]
[Prior art]
Conventionally, there is a structure shown in FIG. 3 as a connection structure of this type of branch connector (see Patent Document 1). The connection structure of this branch connection body has a pressure receiving seat surface 11-that opens outwardly in a branch hole 11-2 that communicates with an internal flow passage 11-1 provided in a peripheral wall portion on the main rail 11 side made of a circular pipe. 3 is formed, and a cylindrical sleeve nipple 13 is attached to the outer peripheral wall of the main rail 11 near the pressure-receiving seat surface by welding or brazing, and has a flow path 12-1 that communicates with the flow passage 11-1. A sleeve washer that has a pressing seat surface 12-3 formed by a connection head portion 12-2 provided at the tip of the branch connector 12 is brought into contact with the pressure receiving seat surface 11-3 and is fitted and fixed to the branch connector side in advance. 15 is a method of connecting the branch connecting body 12 by being screwed together with the sleeve nipple 13 by being screwed into the sleeve nipple 13 so as to be fastened together with the pressure under the neck of the connection head 12-2. It has become.
That is, the connection structure of the branch connection body prevents the buckling and deformation due to the axial force acting on the branch connection body 12 by the sleeve washer 15 fitted and fixed to the branch connection body 12, and stabilizes the seal and the injection pressure. It is a thing that secures sex.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-82664
[Problems to be solved by the invention]
However, in such a conventional connection structure of the branch connection body, as shown in the drawing, the sleeve nipple 13 is arranged such that the tube axis of the sleeve nipple 13 and the center of the pressure receiving seat surface 11-3 of the main rail 11 coincide. Is attached to the outer peripheral wall of the main rail 11, a high sealing performance can be obtained. However, when the sleeve nipple 13 is attached to the main rail 11 with the center deviated, the fastening bag is used. There is a problem that the sealing is insufficient due to a decrease in the sealing force of the branch connection body by the nut 14 and deformation of the seat portion. In addition, there is a problem that the linearity of the branch connection body varies and the seal is insufficient even when the tube axis of the branch connection body and the counterpart mounting shaft are slightly inclined without being coincident.
[0005]
The present invention has been made to solve the above-described conventional problems, and even when the center of the sleeve nipple is deviated and attached to the main rail, the pipe shaft of the branch connection body and the mating mounting shaft are also provided. Therefore, it is an object of the present invention to provide a connection structure for a branch connection body for a common rail that can ensure a high sealing performance even when they are not matched and are slightly inclined.
[0006]
[Means for Solving the Problems]
The connection structure of the branch connection body for the common rail according to the present invention includes an outer surface formed on the peripheral surface portion of the branch hole provided with a space in the axial peripheral wall portion of the main rail having a flow passage in the axial direction inside. Branch connecting body having a flow path that is connected to the main rail by welding or brazing a cylindrical sleeve nipple concentrically with the pressure receiving seating surface so as to surround the pressure receiving seating surface that opens in the direction The press seat surface formed by the connection head provided at the end of the sleeve is brought into contact with and engaged with the pressure-receiving seat surface, and a tightening cap nut externally mounted on a sleeve washer previously fitted on the branch connector is screwed onto the sleeve nipple. In the connection structure of the branch connection body for the common rail, which is fastened with the pressure under the connection head neck to connect the branch connection body, the sleeve washer is connected to the flanged washer and the flange without the flange. As a two-part structure composed of a washer, both washers are fitted on the branch connector so that they can be laterally displaced from each other at their abutment surfaces, and the inner diameter of the flanged sleeve washer is slightly larger than the outer diameter of the branch connector None, the inside diameter of the opening opposite to the base of the sleeve nipple is slightly larger than the outside diameter of the sleeve washer having the two-part structure.
Further, the flangeless washer is configured to be press-fitted under the neck of the connecting head, and further, the flange portion back surface of the flanged washer is formed as a spherical surface or a tapered surface, and the spherical surface or the tapered surface is provided. The inner surface of the fastening nut that is in contact is a curved surface or a tapered surface having the same curvature radius as the spherical surface.
[0007]
In the present invention, the sleeve washer is divided into two parts and externally fitted to the branch connecting body so that both washers can be laterally displaced from each other at the abutment surface thereof, and the center of the sleeve nipple is displaced and is attached to the main rail. This is because sometimes the deviation can be absorbed. Also, the flangeless washer is press-fitted under the neck of the connecting head, so that if the cap nut is tightened excessively when the pipe is connected, the axial force generated by the excessive tightening torque is absorbed to prevent the washer from being deformed. In addition, the buckling strength is improved and the bending fatigue strength is also improved. Further, the back surface of the sleeve washer in contact with the inner surface of the tightening bag nut is a spherical surface, and the inner surface of the tightening bag nut in contact with the spherical surface is a curved surface or a tapered surface. This is because the surface pressure of the contact portion between the back surface of the sleeve washer and the tightening cap nut is always kept uniform even when they do not match.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a longitudinal sectional view showing an embodiment of a connection structure for a common rail branch connection according to the present invention, and FIG. 2 is a longitudinal sectional view showing another embodiment of the connection structure for a common rail branch connection, 1 is a main rail, 2 is a branch connection body, 3 is a sleeve nipple, 4 is a cap nut for tightening, 5-1 and 5-2 are sleeve washers having a two-part structure, and 6 and 7 are gaps.
[0009]
The main rail 1 as a common rail is a steel pipe for high-pressure piping equivalent to material STS48 having a relatively thick tubular portion having a diameter of 28 mm and a thickness of 9 mm, for example. -1.
[0010]
In the case of a common rail having a sleeve nipple 3 that is separate from the main rail 1, a tightening cap nut 4 that is incorporated on the outer peripheral wall of the main rail 1 at the branch connector 2 side in the pre-processing step. The sleeve nipple 3 provided with the screw surface 3-1 to be screwed is used as a joint fitting, and the base end portion thereof is directly welded or brazed to be attached. The opening on the side opposite to the base end of the sleeve nipple 3 has an outer diameter of the sleeve washer so that a gap 7 is formed between the outer periphery of the sleeve washers 5-1 and 5-2 having a two-part structure. It has a large diameter. Subsequently, in a finishing process, a circular outer periphery that opens to a portion surrounded by the sleeve nipple 3 of the main rail 1 and communicates with the flow passage 1-1 of the main rail 1 is formed. A branch hole 1-2 whose surface is the pressure receiving seat surface 1-3 is formed.
[0011]
On the other hand, the branch connection body 2 is composed of a branch branch pipe or a branch metal fitting, and has a flow path 2-1 that communicates with the flow path 1-1 of the main rail 1 inside thereof. A pressing seat surface 2-3 formed by a connecting head portion 2-2 having an enlarged diameter by a tapered conical buckling formed continuously with a spherical tip seal surface is provided.
[0012]
The sleeve washer having a two-part structure is composed of a flanged washer 5-1 and a flangeless washer 5-2. The connection structure shown in FIG. 1 has an inner surface of the fastening cap nut 4 and a rear surface of the flanged washer 5-1. They are in flat surface contact with each other, and their inner diameters are slightly larger than the outer diameter of the branch connector 2.
On the other hand, in the connection structure shown in FIG. 2, the rear surface of the flange portion of the washer 5-1 with flange is formed as a spherical surface or a tapered surface 5-1a, and the inner diameter is slightly larger than the outer diameter of the branch connector 2 as described above. There is no. Then, the inner surface of the tightening cap nut 4 in contact with the spherical surface or the tapered surface 5-1a of the flanged washer 5-1 is defined as a curved surface 4-1 having the same or a slightly larger curvature radius as the tapered surface or the spherical surface. The rear surface of the flanged washer 5-1 and the inner surface of the fastening cap nut 4 are preferably brought into press contact with each other by making spherical contact.
6 is a gap provided between the inner surface of the flanged washer 5-1 and the outer surface of the branch connector 2.
Further, the flangeless washer 5-2 is provided with a stepped enlarged diameter portion 5-2a that covers the outer peripheral surface of the neck lower portion of the connection head 2-2 of the branch connector 2, and the stepped enlarged diameter portion of the washer is provided. The side end surface is covered with the maximum diameter portion of the connection head 2-2 (see Japanese Patent Application Laid-Open No. 2002-54770), but is not limited to this shape.
[0013]
The material of the sleeve washers 5-1 and 5-2 is preferably the same material as that of the main rail 1 or higher, and for example, hard materials such as S45C and SCM435 can be used.
[0014]
In the connection structure of the branch connector 2 of the present invention shown in FIG. 1, the pressure seat surface 2-3 formed by the connection head 2-2 on the branch connector 2 side is changed to the pressure receiving seat surface 1-3 on the main rail 1 side. The connection head is formed by abutting engagement and screwing a fastening nut 4 which is previously packaged on a sleeve washer 5-1 and 5-2 having a two-divided structure on the side of the branch connector 2 into the sleeve nipple 3. 2-2 It is configured to be connected by tightening with the press of the sleeve washers 5-1 and 5-2 via the fastening cap nut 4 under the neck.
Here, the connection structure shown in FIG. 1 is a two-part structure in which the sleeve washer is composed of a flanged washer 5-1 and a flangeless washer 5-2, and the inner surface of the flanged washer 5-1 branches off. Since the gaps 6 and 7 are provided between the outer surface of the connection body 2 and between the sleeve washers 5-1 and 5-2 and the sleeve nipple 3, the center of the sleeve nipple 3 is shifted to the main pipe. Even if it is attached to the rail, the displacement (lateral deviation) can be absorbed by the contact surfaces of the flanged washer 5-1 and the flangeless washer 5-2, and the axial force acting on the branch connector 2 is lost. Can be transmitted uniformly to the sheet surface.
Further, the connection structure shown in FIG. 2 is obtained by bringing the inner surface of the tightening cap nut 4 and the back surface of the flanged washer 5-1 into spherical contact, tapered surface contact, or spherical surface and tapered surface contact. In addition to the effects of the connection structure shown, even if the branch connection body 2 is slightly inclined or eccentric with respect to the axis of the branch hole 1-2 of the main rail for some reason when tightening the nut, it is provided with a flange. The contact portion between the back surface of the washer 5-1 and the tightening cap nut 4 always maintains a uniform surface pressure to generate a sufficient thrust force, and the sealing surface is also sealed with a uniform surface pressure distribution.
[0015]
Further, in the case of the connection structure shown in FIG. 1 and FIG. 2, branching is achieved by providing a stepped enlarged diameter portion 5-2 a on the sleeve washer that covers the outer peripheral surface of the neck lower part of the connection head 2-2 of the branch connection body 2. In addition to ensuring the internal pressure fatigue strength of the connection body 2, the bending fatigue strength can be ensured by increasing the thickness of the portion of the branch connection body 2 where the sleeve washers 5-1 and 5-2 are fitted.
[0016]
Here, the rail 1 and the sleeve nipple 3 have been described as separate members. However, even when the sleeve nipple is integrated with the rail, the core is used when processing the seat surface 1-3 and the screw 3-1 of the sleeve portion. Needless to say, the present invention is effective when a shift occurs.
[0017]
【The invention's effect】
As described above, the common rail branch connection structure according to the present invention has a branch structure in which a sleeve nipple is attached to a main rail by welding or brazing, and a cap nut screwed into the sleeve nipple is fastened. In the structure for connecting the connection body, the sleeve washer that is fitted to the outer periphery of the branch connection body is divided into two parts in advance, and the back surface of the washer and the inner surface of the fastening nut are spherical contact, tapered surface contact, or spherical pair. By adopting the tapered surface contact, even if the center of the sleeve nipple is shifted and attached to the main rail, the axial force acting on the branch connection body can be uniformly transmitted to the seat surface without loss. An effect is obtained. Even if the branch connector is slightly inclined or eccentric with respect to the axis of the branch hole of the main rail, the contact pressure between the back surface of the sleeve washer and the contact portion of the fastening nut is always kept uniform. Therefore, an excellent effect that a high sealing performance can be secured is obtained.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of a connection structure for a common rail branch connection body according to the present invention.
FIG. 2 is a longitudinal sectional view showing another embodiment of the connection structure of the common rail branch connection body according to the present invention.
FIG. 3 is a longitudinal sectional view showing an example of a connection structure of a conventional common rail branch connection body to which the present invention is applied;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main rail 1-1 Flow path 1-2 Branch hole 1-3 Pressure receiving seat surface 2 Branch connection body 2-1 Flow path 2-2 Connection head 2-3 Pressing seat surface 3 Sleeve nipple 3-1 Screw surface 4 Tightening cap nut 5-1 Flange washer 5-1a Spherical surface or taper surface 5-2 Flangeless washer 5-2a Stepped diameter expansion part 6, 7 Clearance

Claims (3)

その軸芯方向内部に流通路を有する本管レールの軸方向の周壁部に間隔を保持して設けた分岐孔の周面部に形成した外方へ開口する受圧座面を囲むように、当該受圧座面と同心に筒状のスリーブニップルを溶接またはろう付けにより本管レールに取着し、前記流通路に通ずる流路を有する分岐接続体の端部に設けた接続頭部のなす押圧座面部を前記受圧座面に当接係合せしめ、予め分岐接続体側に外嵌したスリーブワッシャに外装した締付け用袋ナットを前記スリーブニップルに螺合することにより、前記接続頭部首下での押圧に伴って締着して分岐接続体を接続する方式のコモンレール用分岐接続体の接続構造において、前記スリーブワッシャをフランジ付きワッシャとフランジなしワッシャとからなる二分割構造として両ワッシャをその当接面で相互に横ずれ可能に分岐接続体に外嵌し、かつ該フランジ付きスリーブワッシャの内径を分岐接続体の外径より僅かに大径となし、前記スリーブニップルの基部と反対側開口部の内径を前記二分割構造のスリーブワッシャの外径より僅かに大径となしたことを特徴とするコモンレール用分岐接続体の接続構造。The pressure receiving seat is formed so as to surround the pressure receiving seat surface that opens outward in the peripheral surface portion of the branch hole that is provided with a space in the axial peripheral wall portion of the main rail having a flow passage in the axial direction. A cylindrical seat nipple concentrically with the seating surface is attached to the main rail by welding or brazing, and a pressing seating surface portion formed by a connection head provided at the end of the branch connection body having a flow path communicating with the flow passage. Is pressed against the pressure-receiving seat surface, and a tightening bag nut externally attached to a sleeve washer previously fitted on the branch connector side is screwed into the sleeve nipple to thereby press the connection head under the neck. In the connection structure of the common rail branch connection body in which the branch connection body is fastened together, the sleeve washer has a two-part structure composed of a flanged washer and a flangeless washer. The flanged sleeve washer is fitted to the branch connection body so as to be laterally displaceable from each other on the contact surface, and the inner diameter of the flanged sleeve washer is slightly larger than the outer diameter of the branch connection body. A connection structure for a branch connection body for a common rail, wherein the inner diameter is slightly larger than the outer diameter of the sleeve washer having the two-part structure. 前記フランジなしワッシャが接続頭部首下に圧嵌された構成となしたことを特徴とする請求項１記載のコモンレール用分岐接続体の接続構造。2. The connection structure for a common rail branch connector according to claim 1, wherein the flangeless washer is press-fitted under the neck of the connection head. 前記フランジ付きワッシャのフランジ部背面を球面もしくはテーパ面となし、該球面もしくはテーパ面と接する前記締付け用袋ナットの内面を当該球面と同一もしくは大きな曲率半径の湾曲面または、テーパ面となしたことを特徴とする請求項１または２記載のコモンレール用分岐接続体の接続構造。The back surface of the flange portion of the washer with flange is a spherical surface or a tapered surface, and the inner surface of the fastening cap nut that is in contact with the spherical surface or the tapered surface is a curved surface or a tapered surface having the same or larger curvature radius as the spherical surface. The connection structure for a branch connection body for a common rail according to claim 1 or 2.
JP2003174009A 2003-06-18 2003-06-18 Connection structure of branch connection for common rail Expired - Fee Related JP4046334B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003174009A JP4046334B2 (en) 2003-06-18 2003-06-18 Connection structure of branch connection for common rail

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003174009A JP4046334B2 (en) 2003-06-18 2003-06-18 Connection structure of branch connection for common rail

Publications (2)

Publication Number Publication Date
JP2005009394A JP2005009394A (en) 2005-01-13
JP4046334B2 true JP4046334B2 (en) 2008-02-13

Family

ID=34097654

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003174009A Expired - Fee Related JP4046334B2 (en) 2003-06-18 2003-06-18 Connection structure of branch connection for common rail

Country Status (1)

Country Link
JP (1) JP4046334B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014109245A (en) * 2012-12-04 2014-06-12 Denso Corp Common rail
WO2024037949A1 (en) * 2022-08-19 2024-02-22 Ti Automotive Technology Center Gmbh Connecting assembly

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI263859B (en) 2003-08-29 2006-10-11 Asml Netherlands Bv Lithographic apparatus and device manufacturing method
JP4357362B2 (en) * 2004-05-19 2009-11-04 臼井国際産業株式会社 Joint structure of branch connection for common rail
FR2889729B1 (en) * 2005-08-09 2007-10-19 Usui Kokusai Sangyo Kk JOINT STRUCTURE OF CONNECTING CONNECTOR FOR COMMON RAIL
JP2007056816A (en) * 2005-08-26 2007-03-08 Usui Kokusai Sangyo Kaisha Ltd Connection structure for branched connection pipe
KR100999025B1 (en) * 2006-03-14 2010-12-09 우수이 고쿠사이 산교 가부시키가이샤 Structure for connecting head portion of high-pressure fuel injection tube
FR2914390B1 (en) * 2007-04-02 2012-08-10 Senior Automotive Blois Sas DEVICE FOR FASTENING A HIGH PRESSURE TUBE TO A CONNECTED CONNECTION OF A COMMON RAIL
US8196967B2 (en) * 2009-02-04 2012-06-12 Robert Bosch Gmbh Improvements to high pressure fuel fittings
CN102261530A (en) * 2011-05-06 2011-11-30 常州常瑞天力动力机械有限公司 Seal connecting device of diesel engine fuel oil metal pipe
DE102012209421A1 (en) * 2012-06-04 2013-12-05 Robert Bosch Gmbh Device for metering fuel
JP6395218B2 (en) * 2014-12-23 2018-09-26 ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング Component incorporated in fuel injection system and fuel injection system
WO2017094401A1 (en) * 2015-11-30 2017-06-08 日立オートモティブシステムズ株式会社 Injector, fuel rail, and fuel rail assembly
JP7337725B2 (en) * 2020-02-14 2023-09-04 臼井国際産業株式会社 Fuel pressure sensor connection structure
CN111520266A (en) * 2020-03-17 2020-08-11 成都威特电喷有限责任公司 Lightweight high-pressure oil rail

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3584900A (en) * 1968-09-18 1971-06-15 Sno Trik Co High-pressure sealing and gripping device
JPS5523449U (en) * 1978-08-02 1980-02-15
JPS55119358U (en) * 1979-02-15 1980-08-23
JPS56156966U (en) * 1980-04-22 1981-11-24
JP3882951B2 (en) * 1996-09-27 2007-02-21 臼井国際産業株式会社 High pressure injection pipe connection head structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014109245A (en) * 2012-12-04 2014-06-12 Denso Corp Common rail
WO2024037949A1 (en) * 2022-08-19 2024-02-22 Ti Automotive Technology Center Gmbh Connecting assembly

Also Published As

Publication number Publication date
JP2005009394A (en) 2005-01-13

Similar Documents

Publication Publication Date Title
JP4046334B2 (en) Connection structure of branch connection for common rail
US7568736B2 (en) Joint structure of branch connector for common rail
US6929288B2 (en) Connecting structure of branch connector in fuel pressure accumulating container
US6415768B1 (en) Diesel engine fuel injection pipe
US5667255A (en) Joint structure for joining a branch member to a high pressure fuel rail
CN102095031B (en) Pipe fastening structure
FR2884588A1 (en) CONNECTING DEVICE FOR TUBES
GB2322922A (en) Common rail branch fitting
JPH0533832Y2 (en)
US20040003795A1 (en) Accumulation type fuel injection system for engine
JP3841370B2 (en) Common rail
JP3846749B2 (en) Connecting head structure of high-pressure fuel injection pipe
JP3768043B2 (en) Connection structure of branch connection for common rail
JP2001082663A (en) Connecting structure of branch connecting body for common rail
JP3806302B2 (en) Common rail
JP3916178B2 (en) Common rail
JPH10213045A (en) Connecting structure for branch connecting body in common rail
JPH0466769A (en) High pressure fuel joint
JP3916176B2 (en) Common rail
JP3749012B2 (en) Common rail and manufacturing method thereof
JPH10176783A (en) Common rail
JPH10220320A (en) Common rail
JP3841369B2 (en) Common rail
JP3877185B2 (en) Connection structure of branch connection in common rail
JP3885903B2 (en) Common rail

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20060616

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20071116

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20071126

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20071119

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20101130

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Ref document number: 4046334

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20101130

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20111130

Year of fee payment: 4

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20121130

Year of fee payment: 5

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20131130

Year of fee payment: 6

LAPS Cancellation because of no payment of annual fees