JP4003891B2 - Connection structure of branch connection in common rail - Google Patents
Connection structure of branch connection in common rail Download PDFInfo
- Publication number
- JP4003891B2 JP4003891B2 JP11959096A JP11959096A JP4003891B2 JP 4003891 B2 JP4003891 B2 JP 4003891B2 JP 11959096 A JP11959096 A JP 11959096A JP 11959096 A JP11959096 A JP 11959096A JP 4003891 B2 JP4003891 B2 JP 4003891B2
- Authority
- JP
- Japan
- Prior art keywords
- branch
- screw
- connection
- seat surface
- main rail
- 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
Links
Classifications
-
- 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
-
- 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
- F16L41/02—Branch units, e.g. made in one piece, welded, riveted
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Branch Pipes, Bends, And The Like (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高圧燃料多岐管或いはブロック・レール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ものである。
【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は、例えば図３に示すように、本管レール（１１）側の周壁部に設けた内部の流通路（１１′）に通ずる貫孔（１１″）のなす外方に開口する受圧座面（１２）とに、該受圧座面附近の本管レール（１１）の外周部を囲繞する継手金具（１４）の使用により、端部に先細円錐状の挫屈成形による拡径した分岐接続体（１３）側の接続頭部（１３′）のなす押圧座面（１３″）を当接係合せしめ、該継手金具に突設した螺子壁（１４′）部と予め分岐接続体（１３）側に組込んだナット（１５）の螺合による前記接続頭部（１３′）首下での押圧に伴って締着して接続するように構成されていた。尚（１６）はスリーブ・ワッシャーである。
【０００３】
【発明が解決しようとする課題】
しかしながら、このような従来の技術による接続構造としては、前記継手金具（１４）の使用により接続部での製品重量を著しく増すこととなり、かつ分岐接続体（１３）での挫屈成形による拡径した前記接続頭部（１３′）の構造により該頭部内部に環状のポケット部（１７）を生ぜしめて燃料の流過抵抗を増大ならしめ、またナット（１５）による直接の螺合締着構造により長期に亘って緩みを招いて洩れを誘発してその接続を不安定となす等の問題を有するものであった。
【０００４】
本発明は従来技術の有する前記問題に鑑みてなされたものであり、従来技術のように継手金具を一切不要となして製品重量を極度に軽減し、また分岐接続体側の押圧座面部のなす端部附近での原径構造および内部の平滑な構造とによって機械的強度を高めると共に、燃料の流過抵抗を増大ならしめる等の憂いをなくし、さらに長期に亘って相互の当接係合部での緩みによる洩れをなくし、確実にして安定した、しかも簡易に接続することのできるコモンレールにおける分岐接続体の接続構造を提供することを目的とするものである。
【０００５】
【課題を解決するための手段】
本発明は上記目的を達成するため、軸芯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複数の貫孔を設け、且つ該貫孔の周面部にそれぞれ前記流通路に通ずる流路を有する分岐接続体を連設する外方への開口する受圧座面を形成して該分岐接続体の端部のなす先細円錐状の押圧座面部を当接係合せしめて分岐接続体を固定、接続してなる分岐接続体の接続構造において、前記本管レールのなす貫孔部の開口する前記受圧座面に連なって螺子部を設け、かつ、分岐接続体側のなす前記押圧座面に連なる螺子面をもって前記螺子部に螺合締着して接続構成し、前記分岐接続体側のなす螺子面の近くに別途逆螺子面を設け、組込んだナットとの螺合により本管レールの外周面とその先端を係圧するロック機能を備えて形成したコモンレールにおける分岐接続体の接続構造を要旨とするものであり、又、本発明はこのロック機能を備えた分岐接続体の接続構造において、前記受圧座面と押圧座面とのなす相互の当接係合部分および前記螺子面と螺子部とのなす相互の螺合部分をロー熔着して形成すると共に、前記分岐接続体とナットとの逆螺子面による螺合部又は該ナットと本管レールとの係圧部のうち少なくとも一方を更にロー熔着して形成したりするものである。
【０００６】
以上のように構成されているため、本発明では本管レール側と分岐接続体との直接の螺合締着による接続構造により、継手金具を一切不要となすため製品を極度に軽量となすことができ、また、拡径を必要としない分岐接続体側の押圧座面部のなす端部附近での原径構造およびその内部の平滑な構造とによって該端部附近での機械的強度を高めると共に、燃料の流過抵抗が増大する等の憂いをなくし、さらに長期に亘って相互の当接係合部での緩みをなくして確実にして安定した、しかも簡易に接続することができることとなる。
【０００７】
【発明の実施の形態】
以下、本発明の実施例を図面に基づいて説明すれば、図１は本発明のコモンレールにおける分岐接続体の接続構造の一実施例を示すロー熔着前の接続部の拡大断面図、図２は本発明の他の実施例を示すロー熔着後の図１相当図であって、（１）はコモンレールとしての本管レールであり、例えば管径２０ｍ／ｍ、肉厚８ｍ／ｍ程度の比較的厚肉で細径の金属管であって、その軸芯内部を流通路（１′）となして軸方向の周壁部に間隔を保持して複数からなる外方に開口する周面を受圧座面（２）となす貫孔（１″）を流通路（１′）に連通して設けると共に、該受圧座面に連なって螺子部（２′）を形成してなるものである。
【０００８】
（３）は図１、図２に図示する分岐枝管からなる分岐接続体であって、その内部に前記流通路（１′）に通ずる流路（３′）を有して端部のなす原径による肉壁部をもって先細円錐状の押圧座面（３″）となし、且つ該押圧座面に連なって螺子面（４）と、ロック機構を構成するための逆螺子面（４′）を設けてなるものである。
【０００９】
即ち、本発明は、前記螺子面（４）による前記本管レール（１）側の螺子部（２′）への螺合締着に伴って押圧座面（３″）部を受圧座面（２）部に当接係合して接続構成すると共に、前記逆螺子面（４′）と組込んだナット（６）との螺合によって本管レール（１）の外周面にその先端を係圧するロック機構を構成したものである。本発明はこのロック機構を備えることにより、前記当接係合部での緩みを防止せしめ、更に図２のように前記受圧座面（２）と押圧座面（３″）とのなす相互の当接係合部分及び／又は螺子面（４）と螺子部（２′）との相互の螺合部分のみならず、前記分岐接続体（３）とナット（６）との逆螺子面（４′）による螺合部及び／又は該ナットと本管レール（１）との係圧部を更にロー熔着（５）して、一層安定した接続を得るように構成したものである。
【００１０】
【発明の効果】
以上説明したように本発明によるコモンレールにおける分岐接続体の接続構造は、特に前記本管レール（１）側の受圧座面（２）に連なる螺子部と、一方の分岐接続体（３）側のなす拡径を必要としない原径端部での押圧座面（３″）に連なる螺子面（４）とのなす相互の螺合締着による前記当接係合構造により、接続部での別途継手金具を一切不要となして製品を極度に軽量となすことができ、また、分岐接続体（３）の押圧座面（３″）部のなす端部附近での原型および内部の平滑な構造により、該附近での機械的強度を高めると共に、燃料の流過抵抗を増大される等の憂いをなくし、さらにロック機能により長期に亘って相互の当接係合部での緩みによる洩れをなくして確実にして安定した、しかも簡易に接続することができる等、極めて有用なコモンレールにおける分岐接続体の接続構造である。
【図面の簡単な説明】
【図１】 本発明のコモンレールにおける分岐接続体の接続構造の一実施例を示すロー熔着前の接続部の拡大断面図である。
【図２】 本発明の他の実施例を示すロー熔着後の図１相当図である。
【図３】 従来例を示すコモンレールにおける分岐接続体の接続構造の一部切欠きによる拡大断面図である。
【符号の説明】
１ 本管レール
１″ 貫孔
２ 受圧座面
２′ 螺子部
３ 分岐接続体
３′流路
３″ 押圧座面
４ 螺子面
４′ 逆螺子面
５ ロー熔着
６ ナット[0001]
BACKGROUND OF THE INVENTION
The present invention generally relates to a connection structure of a branch connection body using a branch branch pipe or a branch fitting in a common rail such as a high pressure fuel manifold or a block rail in a diesel internal combustion engine.
[0002]
[Prior art]
Conventionally, for example, as shown in FIG. 3 , this kind of branch connection structure has a through-hole (11 ″) that communicates with an internal flow passage (11 ′) provided in a peripheral wall portion on the main rail (11) side. ) And the pressure-receiving seat surface (12) that opens outwardly, and the use of a fitting (14) that surrounds the outer periphery of the main rail (11) in the vicinity of the pressure-receiving seat surface results in a tapered conical shape at the end. The screw wall (14) projecting from the joint fitting is brought into contact with and engaged with the pressing seat surface (13 ″) formed by the connection head (13 ′) on the side of the branch connection body (13) whose diameter is expanded by the buckling molding of ′) Part and a nut (15) assembled in advance on the branch connection body (13) side are fastened and connected by pressing under the neck of the connection head (13 ′). It was. Reference numeral (16) denotes a sleeve washer.
[0003]
[Problems to be solved by the invention]
However, as such a connection structure according to the conventional technique, the use of the joint fitting (14) significantly increases the product weight at the connection portion, and the diameter of the branch connection body (13) is increased by crimping. Due to the structure of the connecting head (13 '), an annular pocket portion (17) is formed inside the head to increase the flow resistance of the fuel, and a direct screw-fastening structure with a nut (15). Therefore, it has a problem that it causes loosening over a long period of time, causes leakage, and makes the connection unstable.
[0004]
The present invention has been made in view of the above-mentioned problems of the prior art, and eliminates the need for joint fittings as in the prior art, thereby extremely reducing the weight of the product, and the end formed by the pressing seat surface portion on the branch connector side. In addition to increasing the mechanical strength due to the original diameter structure near the section and the smooth structure inside, it eliminates the concern of increasing the flow resistance of the fuel, etc. It is an object of the present invention to provide a connection structure of a branch connection body in a common rail that can be securely, stably, and easily connected by eliminating leakage due to loosening of the cable.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides a plurality of through holes in the axial peripheral wall portion of the main rail having a flow passage inside the shaft core so as to be spaced apart, and each of the peripheral surface portions of the through holes has the above-mentioned A pressure-receiving seat surface that opens outwardly connecting the branch connection body having a flow path that communicates with the flow passage is formed, and the tapered cone-shaped pressing seat surface portion formed by the end of the branch connection body is brought into contact with and engaged. fixing the branch connection body, in the connection structure for a branching connection body formed by connecting a threaded portion provided I communicating Do to the pressure receiving seat surface of the opening of the form through-hole portion of the front Symbol main rail, and the branch connection side wherein with a screw surface communicating ing the pressing seat surface formed by screwed fastened to the screw portion and connection configuration of, the branch connection side provided separately reverse screw surfaces near the eggplant screw surface of incorporating nuts and It was formed with a lock function to press the outer peripheral surface of the main rail and its tip by screwing Is intended to gist a connection structure of the branch connector in Monreru, also, the present invention in the connection structure for a branching connection body having the locking feature, contact of the forms mutually between the pressure receiving seat surface and the pressing seat surface The engaging portion and the screwed portion formed by the screw surface and the screw portion are formed by low welding, and the screwed portion by the reverse screw surface of the branch connector and the nut or the nut and main rail And at least one of the engagement portions is further formed by low welding.
[0006]
Since it is configured as described above, the present invention makes the product extremely lightweight by eliminating the need for joint fittings at all by the connection structure by direct screw fastening between the main rail side and the branch connector. In addition, by increasing the mechanical strength in the vicinity of the end portion by the original diameter structure near the end portion formed by the pressing seat surface portion on the side of the branch connecting body that does not require diameter expansion and the smooth structure therein, It is possible to eliminate the anxiety such as increase in the flow resistance of the fuel, and to ensure a stable and simple connection without loosening at the abutting engagement portions over a long period of time.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged cross-sectional view of a connecting portion before soldering, showing an embodiment of a connecting structure of a branch connection body in a common rail according to the present invention. FIG. 1 is a view corresponding to FIG. 1 after low welding showing another embodiment of the present invention , wherein (1) is a main rail as a common rail, for example, a pipe diameter of 20 m / m and a wall thickness of about 8 m / m. A relatively thick and thin metal tube having a flow path (1 ′) inside the shaft core and a plurality of outer surfaces opened outwardly while maintaining a space in the axial peripheral wall portion. A through hole (1 ″) that forms a pressure receiving seat surface (2) is provided in communication with the flow passage (1 ′), and a screw portion (2 ′) is formed in connection with the pressure receiving seat surface.
[0008]
(3) is a branch connection body comprising the branch branch pipes shown in FIGS . 1 and 2, and has a flow path (3 ′) communicating with the flow path (1 ′) inside thereof and formed at the end. conical pressing seat surface tapering with a meat wall by Hara diameter (3 ") ungated and screw surface I communicating Do to push圧座surface (4), the reverse screw surfaces for forming the locking mechanism (4 ') Ru der made provided.
[0009]
That is, according to the present invention, the pressure seating surface (3 ″) is moved to the pressure receiving seating surface (3 ′) when the screwing surface (4) is screwed to the screwing portion (2 ′) on the main rail (1) side. 2) Abutting and engaging with the part, the connection structure is formed, and the tip of the main rail (1) is engaged with the outer peripheral surface of the main rail (1) by screwing the reverse screw surface (4 ') and the incorporated nut (6). According to the present invention, the locking mechanism is provided to prevent loosening at the abutting engagement portion, and the pressure receiving seat surface (2) and the pressing seat as shown in FIG. Not only the mutual abutting engagement portion formed with the surface (3 ″) and / or the mutual screwing portion between the screw surface (4) and the screw portion (2 ′), but also the branch connector (3) and the nut (6) and the engagement portion between the threaded portion (4 ') and / or the engagement portion between the nut and the main rail (1) are further low welded (5) Is obtained by configured to obtain boss was a connection.
[0010]
【The invention's effect】
Above connecting structure of the branch connector in the common rail according to the present invention described is particularly a threaded portion communicates ing to the main rail (1) side of the pressure receiving seat surface (2), one branch connection body (3) by the abutting engagement structure of the pressing seat surface (3 ') threaded surface communicating ing to (4) and forming mutual screwing fastening in at the original-diameter end portions which do not require forming enlarged side connection The product can be made extremely light by eliminating the need for a separate fitting at the joint, and the prototype and the interior near the end formed by the pressing seat surface (3 ″) of the branch connector (3). The smooth structure increases the mechanical strength in the vicinity and eliminates the fear of increasing the flow resistance of the fuel, and further loosens at the abutting engagement portion over a long period of time by the lock function. For example, it can be reliably and stably connected without leaks, and can be easily connected. Te is a connection structure of the branching connection body in useful common rail.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view of a connection portion before brazing, showing an embodiment of a connection structure of branch connection bodies in a common rail of the present invention .
FIG. 2 is a view corresponding to FIG. 1 after row welding showing another embodiment of the present invention.
FIG. 3 is an enlarged cross-sectional view of a connection structure of a branch connection body in a common rail showing a conventional example by a partial cutout.
[Explanation of symbols]
1 main rail 1 "through-hole 2 pressure receiving seat surface 2 'screw part 3 branch connector 3' flow path 3" press seat surface 4 screw surface 4 'reverse screw surface 5 low welding 6 nut
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11959096A JP4003891B2 (en) | 1996-04-17 | 1996-04-17 | Connection structure of branch connection in common rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11959096A JP4003891B2 (en) | 1996-04-17 | 1996-04-17 | Connection structure of branch connection in common rail |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09280457A JPH09280457A (en) | 1997-10-31 |
| JP4003891B2 true JP4003891B2 (en) | 2007-11-07 |
Family
ID=14765146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11959096A Expired - Fee Related JP4003891B2 (en) | 1996-04-17 | 1996-04-17 | Connection structure of branch connection in common rail |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4003891B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5979945A (en) * | 1996-12-07 | 1999-11-09 | Usuikokusai Sangyo Kaisha Ltd. | Common rail |
| US6929288B2 (en) | 2001-12-20 | 2005-08-16 | Usui Kokusai Sangyo Kaisha Limited | Connecting structure of branch connector in fuel pressure accumulating container |
-
1996
- 1996-04-17 JP JP11959096A patent/JP4003891B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09280457A (en) | 1997-10-31 |
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