JPH10213045A - Connecting structure for branch connecting body in common rail - Google Patents
Connecting structure for branch connecting body in common railInfo
- Publication number
- JPH10213045A JPH10213045A JP9345776A JP34577697A JPH10213045A JP H10213045 A JPH10213045 A JP H10213045A JP 9345776 A JP9345776 A JP 9345776A JP 34577697 A JP34577697 A JP 34577697A JP H10213045 A JPH10213045 A JP H10213045A
- Authority
- JP
- Japan
- Prior art keywords
- common rail
- branch
- flow passage
- opening end
- connection structure
- 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.)
- Withdrawn
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
- F02M55/004—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)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Joints With Pressure Members (AREA)
- Branch Pipes, Bends, And The Like (AREA)
- Valve Housings (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
【0001】[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用の多岐管からなる本管レー
ル或いはブロック・レールなど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などのような分岐接続
体の接続構造に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch connection such as a branch pipe or a branch fitting on a common rail such as a main rail or block rail generally comprising a manifold for high pressure fuel in a diesel internal combustion engine. Related to the connection structure.
【0002】[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6に示すように、コモンレールとして
の多岐管からなる本管レール1側の周壁部に設けた内部
の断面円形の流通路1−1に通ずる分岐孔1−2部を外
方に開口する受圧座面1−3となし、該受圧座面附近の
本管レール1の外周部を囲繞するリング状の継手金具3
を使用し、端部に例えば先細円錐状の挫屈成形による拡
径した分岐接続体としての分岐枝管2側の接続頭部2−
2のなす押圧座面2−3を当接係合せしめ、前記本管レ
ール1の径方向に突出するよう該継手金具に設けた本管
レール1の外方に突出する螺子壁3−1部と予め分岐枝
管2側にスリーブワッシャー5を介して組込んだナット
4の螺合による前記接続頭部2−2首下での押圧に伴っ
て締着して接続する方式のものや、図7、図8に示すご
とくリング状の継手金具3に替えて、筒状のスリーブニ
ップル3a、3bを本管レール1の径方向で外方に突出
するようそれぞれ凹凸嵌合螺着方式、溶接などにより直
接本管レール1の外周壁に取着し、分岐枝管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、前記スリーブニップル
3a、3bに螺合するナット4を締着して接続する方式
のものもが知られている。2. Description of the Related Art Conventionally, as a connection structure of this kind of branch connection body, for example, as shown in FIG. 6, a circular cross section provided inside a main rail 1 made of a manifold as a common rail. A ring-shaped joint fitting 3 surrounding the outer periphery of the main pipe rail 1 near the pressure-receiving seat surface is formed with a pressure-receiving seat surface 1-3 that opens outwardly at a branch hole 1-2 that communicates with the flow passage 1-1.
And a connection head 2- on the side of the branch pipe 2 as an enlarged branch connection body formed by, for example, tapering conical buckling molding at the end.
2, a screw wall 3-1 part which protrudes outward from the main rail 1 provided on the joint fitting so as to protrude in the radial direction of the main rail 1 by making the pressing seat surface 2-3 formed by abutment engagement. A method in which a nut 4 previously assembled to the branch pipe 2 side via a sleeve washer 5 is screwed together with the connection head 2-2 by being screwed together with a press under the neck, 7, instead of the ring-shaped joint fitting 3 as shown in FIG. 8, the cylindrical sleeve nipples 3a, 3b are respectively protruded outwardly in the radial direction of the main pipe rail 1, and are threaded by uneven fitting, welding, etc. To the outer peripheral wall of the main pipe rail 1 so that the pressing seat surface 2-3 formed by the connecting head 2-2 on the branch branch pipe 2 abuts on the pressure receiving seat face 1-3 on the main rail 1 side. There is also known a method in which a nut 4 screwed to the sleeve nipples 3a and 3b is tightened and connected to the sleeve nipples 3a and 3b. There.
【0003】さらに図9に示すようにコモンレールとし
ての本管レール1に該本管レール1と一体のボス3cを
形成し、分岐枝管2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、前記ボス3cの外周面に設けた螺子部3−2に螺合
する袋ナット6を締着して接続する方式のものなども知
られている。Further, as shown in FIG. 9, a boss 3c integral with the main pipe rail 1 is formed on the main pipe rail 1 as a common rail, and a pressing seat surface 2 formed by a connection head 2-2 of the branch pipe 2 is formed.
-3 is brought into contact with a pressure receiving seat surface 1-3 on the main pipe rail 1 side, and a cap nut 6 screwed into a screw portion 3-2 provided on the outer peripheral surface of the boss 3c is tightened and connected. There are also known types.
【0004】[0004]
【発明が解決しようとする課題】上記した従来の分岐接
続体の接続構造はいずれも、本管レール1のようなコモ
ンレールの断面円形の流通路1−1の中心と分岐枝管2
のような分岐接続体の流路2−1の中心とが一致した構
造となっており、その流通路1−1に通ずる分岐孔1−
2はコモンレールとしての本管レール1の流通路1−1
の中心線上に開口し、その開口端部にはエッジがあるた
め、コモンレールの内部に内圧が作用したときコモンレ
ールの断面円形の流通路1−1の開口端部Pに最も大き
な応力が発生し、この開口端部Pが起点となって亀裂が
生じ易く、燃料の洩れを招く可能性があった。In each of the above-described conventional connection structures of a branch connection body, the center of a circular passage section 1-1 of a common rail such as the main pipe rail 1 and the branch branch pipe 2 are connected.
Has a structure in which the center of the flow path 2-1 of the branch connecting body coincides with the center of the flow path 2-1.
2 is a flow path 1-1 of the main rail 1 as a common rail.
And the opening end has an edge. When an internal pressure acts on the inside of the common rail, the largest stress is generated at the opening end P of the flow passage 1-1 having a circular cross section of the common rail. The opening end P serves as a starting point to easily cause cracks, which may lead to fuel leakage.
【0005】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、分岐接続体の流路のコモンレー
ル開口端部に発生する最大応力値を下げて内圧疲労強度
をより向上させることが可能な高圧燃料用のコモンレー
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。The present invention has been made in view of the above-mentioned problems of the prior art, and it is an object of the present invention to reduce the maximum stress value generated at the end of the common rail opening of the flow path of the branch connector to further improve the internal pressure fatigue strength. It is an object of the present invention to provide a connection structure of a branch connector in a possible common rail for high-pressure fuel.
【0006】[0006]
【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、長手方向に断面ほぼ円形の流通路を有するコ
モンレールの該流通路の軸方向の周壁部に間隔を保持し
て複数の分岐孔を設け、かつ該分岐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
端部に設けた接続頭部のなす押圧座面部を当接係合せし
め、コモンレールと一体もしくは別体の継手部分と予め
分岐接続体側に組込んだナットの螺合による前記接続頭
部での押圧に伴って締着して接続してなる分岐接続体の
接続構造において、前記分岐孔のコモンレール側開口端
部を円弧状に面取りしてエッジ部を有しない曲面に形成
したR面取部としたコモンレールにおける分岐接続体の
接続構造を特徴とするものである。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a common rail having a flow passage having a substantially circular cross section in the longitudinal direction. At the end of the branch connector, a hole is formed, and a pressure receiving seat surface that opens outward is formed by connecting a branch connector having a flow path that communicates with the flow passage on the peripheral surface of the branch hole. With the pressing seat surface portion formed by the provided connection head is brought into abutting engagement with the joint rail, which is integral with or separate from the common rail, and is pressed by the connection head by screwing of a nut previously incorporated into the branch connection body side. In the connection structure of the branch connection body which is fastened and connected, the common rail side opening end of the branch hole is chamfered in an arc shape to form an R-chamfered portion having a curved surface having no edge portion. Features connection structure of connection body Is shall.
【0007】また本発明の前記エッジ部を有しない曲面
に形成するコモンレール側開口端部は、R面取部の内周
面における輪郭が前記流通路の直径方向に長径の楕円形
状であったり、前記R面取部の断面形状が分岐孔内周面
と滑らかな曲面で連なったテーパー面と、該テーパー面
とコモンレール流通路内周面が滑らかな曲面で連なった
形状、前記R面取部の断面形状が回転円弧面、回転楕円
面、回転放物線面、回転双曲線面の形状となしたりする
ものである。[0007] In the present invention, the open end of the common rail formed on the curved surface having no edge portion may be such that the contour of the inner peripheral surface of the R chamfered portion is an elliptical shape having a longer diameter in the diameter direction of the flow passage. A cross-sectional shape of the R chamfered portion has a tapered surface continuous with the inner peripheral surface of the branch hole in a smooth curved surface, and a shape in which the tapered surface and the inner peripheral surface of the common rail flow passage are connected in a smooth curved surface. The cross-sectional shape may be a rotating arc surface, a spheroidal surface, a paraboloid of revolution, or a hyperboloid of revolution.
【0008】さらに本発明では、前記コモンレールと別
体の継手部分は、該コモンレールに取付けた継手金具も
しくは筒状のスリーブニップルからなり、または該コモ
ンレールと一体の継手部分は、ボスまたは円形溝からな
ることを特徴とするものであり、前記コモンレールは、
本管レールあるいはブロック・レールあり、また前記分
岐接続体は、分岐枝管あるいは分岐金具であるものであ
る。Further, in the present invention, the joint part separate from the common rail comprises a joint fitting or a cylindrical sleeve nipple attached to the common rail, or the joint part integral with the common rail comprises a boss or a circular groove. Wherein the common rail is
There is a main rail or a block rail, and the branch connection body is a branch branch pipe or a branch fitting.
【0009】ここで、分岐孔のコモンレール側開口端部
のR面取部の半径Rとしては、特に限定するものではな
く、コモンレールの肉厚に応じて適宜設定する。Here, the radius R of the R chamfer at the opening end of the branch hole on the common rail side is not particularly limited, and is appropriately set according to the thickness of the common rail.
【0010】本発明では上記のごとく、コモンレールの
断面ほぼ円形の流通路の中心と、該コモンレールと一体
もしくは別体の継手部分の流路の中心とが一致した接続
構造のコモンレールにおいて、分岐孔のコモンレール側
開口端部をエッジのないR面取部としたことにより、継
手部分の流路のコモンレール流通路開口端部に発生する
最大応力を軽減することができる。According to the present invention, as described above, in the common rail of the connection structure in which the center of the flow passage having a substantially circular cross section of the common rail coincides with the center of the flow passage of the joint part integral with or separate from the common rail, Since the common rail side opening end is an R-chamfer without an edge, the maximum stress generated at the common rail flow passage opening end of the flow path at the joint portion can be reduced.
【0011】[0011]
【発明の実施の形態】図1は本発明に係るコモンレール
における分岐接続体の接続構造例のコモンレールとして
の本管レール側を一部切欠いて示す拡大断面図、図2は
図1に示す接続構造例における分岐孔のコモンレール側
開口端部のR面取部の内周面における輪郭の一例を示す
図1矢視図、図3は図1に示す接続構造例における分岐
孔のR面取部の断面形状を例示したもので、(A)は分
岐孔内周面と滑らかな曲面で連なったテーパー面と、該
テーパー面とコモンレール流通路内周面が滑らかな曲面
で連なった形状で構成したR面取部の断面形状を示すコ
モンレール側開口端部の断面図、(B)は回転放物線面
で構成したR面取部の断面形状を示すコモンレール側開
口端部の断面図、(C)は回転双曲線面で構成したR面
取部の断面形状を示すコモンレール側開口端部の断面
図、図4はコモンレールとしてのブロック・レールを示
す斜視図、図5は図4の断面図で、(A)は図4のA−
A′線上の断面図、(B)図4のB−B′線上の断面図
である。なお、ここではコモンレールとしての多岐管か
らなる本管レールと別体からなる継手部分として筒状の
スリーブニップルを使用し、このスリーブニップルを直
接本管レールに溶接して構成する図8に示す分岐接続体
の接続構造に適用した場合を例にとり説明する。FIG. 1 is an enlarged cross-sectional view of a common rail according to the present invention, in which a main rail as a common rail is partially cut away, and FIG. 2 is a connection structure shown in FIG. FIG. 1 is a view showing an example of the contour of the inner peripheral surface of the R chamfered portion of the common rail side opening end of the branch hole in the example, and FIG. 3 is a view of the R chamfered portion of the branch hole in the connection structure example shown in FIG. The cross-sectional shape is exemplified, and (A) shows an R formed by a tapered surface connected to the inner peripheral surface of the branch hole by a smooth curved surface, and a shape formed by connecting the tapered surface and the inner peripheral surface of the common rail flow path by a smooth curved surface. FIG. 4B is a cross-sectional view of a common rail side opening end showing a cross-sectional shape of a chamfered portion, FIG. 4B is a cross-sectional view of a common rail side opening end showing a cross-sectional shape of an R-chamfered portion formed of a paraboloid of revolution, and FIG. The cross-sectional shape of the R chamfered section composed of hyperbolic surfaces Sectional view of the to the common rail side opening end portion, FIG. 4 is a perspective view showing a block rail as the common rail, Figure 5 is a cross-sectional view of FIG. 4, (A) is in Fig 4 A-
FIG. 5B is a cross-sectional view taken along line A ′, and FIG. 5B is a cross-sectional view taken along line BB ′ in FIG. Here, a tubular sleeve nipple is used as a joint part formed separately from a main pipe rail composed of a manifold as a common rail, and this sleeve nipple is directly welded to the main rail to form a branch shown in FIG. An example in which the invention is applied to a connection structure of a connection body will be described.
【0012】図1に示す分岐接続体の接続構造は、図8
に示すものと同様、予め分岐接続体としての分岐枝管2
側に組込んだナット4と螺合する螺子面3−1bを内周
面に設けた筒状のスリーブニップル3bを継手部分とな
してその基端部を前記受圧座面1−3付近の本管レール
1の外周壁に該受圧座面部を囲むように分岐孔1−2と
同心円上に溶接し、分岐枝管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、前記スリーブニップル3bに螺合する
ナット4を締着して接続構成するものである。ここで、
コモンレールとしての本管レール1は、例えば管径20
m/m、肉厚8m/m程度の比較的厚肉で細径の金属管
であって、その軸芯内部を断面円形の流通路1−1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1−3となす分岐孔1−2を
流通路1−1に連通して設けてなるものである。一方、
分岐接続体は、前記したような分岐枝管2或いは分岐金
具からなるものであって、その内部に前記流通路1−1
に通ずる流路2−1を有してその端部に先細円錐状の挫
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を設けてなるものである。The connection structure of the branch connector shown in FIG. 1 is shown in FIG.
In the same manner as shown in FIG.
A cylindrical sleeve nipple 3b provided on the inner peripheral surface with a screw surface 3-1b for screwing with the nut 4 incorporated on the side is formed as a joint portion, and its base end is connected to a book near the pressure receiving seat surface 1-3. The pressure seat surface 2-3 formed by the connection head 2-2 on the branch branch pipe 2 side is welded to the outer peripheral wall of the pipe rail 1 so as to surround the pressure receiving seat surface part and concentrically with the branch hole 1-2. The pressure receiving seat surface 1-3 of the rail 1 is brought into contact with and engaged with the pressure receiving seat surface 1-3, and a nut 4 screwed to the sleeve nipple 3b is tightened to form a connection. here,
The main rail 1 as a common rail has a pipe diameter of, for example, 20 mm.
A relatively thick and small-diameter metal tube having a thickness of about 8 m / m and a wall thickness of about 8 m / m. A branch hole 1-2 having a plurality of outwardly open peripheral surfaces as pressure receiving seat surfaces 1-3 is provided so as to communicate with the flow passage 1-1. on the other hand,
The branch connection body is formed of the branch branch pipe 2 or the branch fitting as described above, and has therein the flow passage 1-1.
Bearing surface 2 formed by a connection head 2-2 having a diameter enlarged by tapering conical buckling molding at an end thereof, having a flow path 2-1 communicating with the flow path 2-1.
-3.
【0013】本発明では、本管レール1の周壁部に外方
に開口する周面を受圧座面1−3となし当該本管レール
1の断面円形の流通路1−1に連通する分岐孔1−2の
流通路1−1開口端部を円弧状に面取りしてエッジ部を
有しない曲面に形成したR面取部1−2aとするもので
ある。また、このR面取部1−2aの内周面における輪
郭は真円に限らず、図2に示すごとく断面ほぼ円形の流
通路1−1の直径方向に長径の楕円形状としてもよい。
また、R面取部の断面形状としては、図3(A)に示す
ごとく、分岐孔の垂直部の内周面1−2bと半径r1の
滑らかな曲面1−2cで連なったテーパー面1−2d
と、該テーパー面と本管レール流通路内周面1−1aが
半径r2の滑らかな曲面1−2eで連なった形状、また
は同(B)に示すごとく、分岐孔の垂直部の内周面1−
2bと連なった半径r3の滑らかな曲面1−2fと本管
レール流通路内周面1−1aが半径R1の滑らかな曲面
1−2で連なった回転放物線面、同(C)に示すごと
く、分岐孔の垂直部の内周面1−2bと連なった半径R
2の滑らかな曲面1−2hと本管レール流通路内周面1
−1aが半径r4の滑らかな曲面1−2iで連なった回
転双曲線面とすることができる。なお、前記各R面取部
の半径R、R1、R2、r1、r2、r3、r4は特に
限定されるものではなく、コモンレールとしての本管レ
ールやブロック・レールの肉厚に応じて適宜設定する。In the present invention, the outer peripheral surface of the peripheral wall of the main rail 1 is formed as a pressure receiving seat surface 1-3, and the branch hole communicates with the circular passageway 1-1 of the main rail 1. An R-chamfered portion 1-2a is formed by chamfering an open end of the flow passage 1-1 of the 1-2 in an arc shape and forming a curved surface having no edge portion. The contour of the inner peripheral surface of the R chamfered portion 1-2a is not limited to a perfect circle, but may be an elliptical shape having a longer diameter in the diameter direction of the flow passage 1-1 having a substantially circular cross section as shown in FIG.
As the cross-sectional shape of the R chamfered portion, Fig. 3 as (A), the tapered surface 1 continuous with the inner peripheral surface 1-2b and smooth curved surface 1-2c of the radius r 1 of the vertical portion of the branch hole -2d
When, as shown in the shape the tapered surface and the main rail flow passage peripheral surface 1-1a is continuous smooth curved surface 1-2e radius r 2, or the, (B), the inner periphery of the vertical portion of the branch hole Surface 1
Rotation parabolic surface smooth curved 1-2f and the main rail flow passage peripheral surface 1-1a is continuous smooth curved surface 1-2 of the radius R 1 of the radius r 3 in which continuous and 2b, shown in (C) As shown, the radius R connected to the inner peripheral surface 1-2b of the vertical portion of the branch hole
2 smooth curved surface 1-2h and main pipe rail flow path inner peripheral surface 1
-1a can be a rotating hyperbolic surface continuous with a smooth curved surface 1-2i radius r 4. The radius R, R 1 , R 2 , r 1 , r 2 , r 3 , r 4 of each of the R chamfers is not particularly limited, and the thickness of the main rail or block rail as a common rail is not limited. Set appropriately according to the thickness.
【0014】このように本管レール1の断面ほぼ円形の
流通路1−1に連通する分岐孔1−2の流通路1−1開
口端部をエッジのないR面取部とした場合には、本管レ
ール1に内圧が作用したときに分岐孔1−2の流通路1
−1開口端部に発生する最大応力は大幅に軽減される。
したがって、開口端部Pが起点となって亀裂が生じると
いう問題はほとんど解消される。As described above, when the opening end of the flow passage 1-1 of the branch hole 1-2 communicating with the flow passage 1-1 having a substantially circular cross section of the main pipe rail 1 is an R-chamfer without an edge. When the internal pressure acts on the main pipe rail 1, the flow path 1 of the branch hole 1-2 is formed.
-1 The maximum stress generated at the open end is greatly reduced.
Therefore, the problem that a crack starts from the opening end P is almost eliminated.
【0015】なお図1ないし図3においてはコモンレー
ルとして本管レールを使用した例を説明したが、図4お
よび図5に示すようにコモンレールとしてブロック・レ
ール1′を用いることができる。そして該ブロック・レ
ール1′には相互に連通(図示せず)する断面円形の流
通路1−1、1−1′が形成され、該流通路1−1、1
−1′側の開口端部がエッジのないR面取部1−2aと
なり、外方に開口する周面を受圧座面1−3となす分岐
孔1−2を設けている。そして受圧座面1−3から外方
に向かって内周面に螺子面を設けた円形溝7を穿設して
継手部分となし、予め分岐接続体2側に組込んだナット
4を円形溝7の内周面に設けた螺子面に螺合せしめて分
岐接続体2側の接続頭部2−2のなす押圧座面2−3を
ブロック・レール1′側の受圧座面1−3に当接係合せ
しめ前記ナット4を締着して接続構成するものである。
なお8は分岐接続体2の接続頭部2−2の背後に組込ま
れたワッシャーである。Although FIGS. 1 to 3 show an example in which the main rail is used as the common rail, a block rail 1 'can be used as the common rail as shown in FIGS. The block rails 1 'are formed with flow passages 1-1 and 1-1' having a circular cross section which communicate with each other (not shown).
The opening end on the -1 'side is an R-chamfered portion 1-2a having no edge, and a branch hole 1-2 is provided, the outer peripheral surface of which is open to serve as a pressure receiving seat surface 1-3. A circular groove 7 having a threaded surface on the inner peripheral surface is formed by drilling outward from the pressure receiving seat surface 1-3 to form a joint portion. The nut 4 previously assembled on the branch connecting body 2 side is provided with a circular groove. 7 is screwed into a screw surface provided on the inner peripheral surface of the block 7 so that the pressing seat surface 2-3 formed by the connection head 2-2 of the branch connection body 2 contacts the pressure receiving seat surface 1-3 of the block rail 1 '. The nuts 4 are brought into contact and fastened to form a connection.
Reference numeral 8 denotes a washer incorporated behind the connection head 2-2 of the branch connection body 2.
【0016】[0016]
【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、コモンレー
ルの断面ほぼ円形の流通路に連通する分岐孔の流通路開
口端部を円弧状に面取りしてエッジ部を有しない曲面に
形成したことにより、分岐金具もしくはスリーブニップ
ルのような別体の継手部分、またはボスもしくは円形溝
のような一体の継手部分の流路のコモンレール開口端部
に発生する最大応力を大幅に軽減できるので、各分岐孔
における内圧疲労強度が高く、耐久性に優れ、亀裂の発
生による燃料洩れをなくして確実にして安定した機能を
発揮することができる。また本発明に係る分岐接続体の
接続構造は、コモンレール以外の分岐管継手や、油圧マ
ニホールド、水圧マニホールド用にも適用可能である。As described above, the connection structure of the branch connector in the common rail according to the present invention is such that the flow passage opening end of the branch hole communicating with the flow passage having a substantially circular cross section of the common rail is chamfered in an arc shape. Due to the curved surface having no edge portion, the maximum generated at the common rail opening end of the flow path of a separate joint portion such as a branch fitting or a sleeve nipple, or an integral joint portion such as a boss or a circular groove is formed. Since the stress can be greatly reduced, the internal pressure fatigue strength in each branch hole is high, the durability is excellent, and fuel leakage due to the generation of cracks can be eliminated to ensure a stable function. The connection structure of a branch connector according to the present invention is also applicable to branch pipe joints other than common rails, hydraulic manifolds, and hydraulic manifolds.
【図1】本発明に係るコモンレールにおける分岐接続体
の接続構造例のコモンレールとしての本管レール側を一
部切欠いて示す拡大断面図である。FIG. 1 is an enlarged cross-sectional view showing a main rail side as a common rail in a common rail connection structure example of the present invention, partially cut away.
【図2】図1に示す接続構造例における分岐孔のコモン
レール側開口端部のR面取部の内周面における輪郭の一
例を示す図1矢視図である。2 is a view taken along the arrow in FIG. 1 showing an example of a contour of an inner peripheral surface of an R chamfered portion of a common rail side opening end of a branch hole in the connection structure example shown in FIG. 1;
【図3】図1に示す接続構造例における分岐孔のR面取
部の断面形状を例示したもので、(A)は分岐孔内周面
と滑らかな曲面で連なったテーパー面と、該テーパー面
とコモンレール流通路内周面が滑らかな曲面で連なった
形状で構成したR面取部の断面形状を示すコモンレール
側開口端部の断面図、(B)は回転放物線面で構成した
R面取部の断面形状を示すコモンレール側開口端部の断
面図、(C)は回転双曲線面で構成したR面取部の断面
形状を示すコモンレール側開口端部の断面図である。3A and 3B illustrate a cross-sectional shape of an R-chamfered portion of a branch hole in the connection structure example shown in FIG. 1; FIG. 3A illustrates a tapered surface connected to an inner peripheral surface of the branch hole by a smooth curved surface; The cross-sectional view of the common rail side opening end showing the cross-sectional shape of the R-chamfered portion formed by connecting the surface and the inner peripheral surface of the common rail flow path with a smooth curved surface, and (B) is the R-chamfer formed by a paraboloid of revolution. FIG. 7C is a cross-sectional view of a common rail-side opening end showing a cross-sectional shape of a portion, and FIG. 7C is a cross-sectional view of a common rail-side opening end showing a cross-sectional shape of an R chamfer formed of a hyperboloid of revolution.
【図4】コモンレールとしてのブロック・レールを示す
斜視図である。FIG. 4 is a perspective view showing a block rail as a common rail.
【図5】図4の断面図で、(A)は図4のA−A′線上
の断面図、(B)図4のB−B′線上の断面図である。5A is a cross-sectional view taken along line AA ′ of FIG. 4; FIG. 5B is a cross-sectional view taken along line BB ′ of FIG. 4;
【図6】リング状の継手金具を使用した従来のコモンレ
ールにおける分岐接続体の接続構造例を一部切欠いて示
す断面図である。FIG. 6 is a cross-sectional view showing a connection structure example of a branch connection body in a conventional common rail using a ring-shaped joint fitting, partially cut away.
【図7】筒状のスリーブニップルを凹凸嵌合螺着方式に
てコモンレールとしての本管レールに取着した構成の従
来のコモンレールにおける分岐接続体の接続構造例を一
部切欠いて示す断面図である。FIG. 7 is a cross-sectional view partially cut away showing an example of a connection structure of a branch connection body in a conventional common rail having a configuration in which a cylindrical sleeve nipple is attached to a main rail as a common rail by an uneven fitting screwing method. is there.
【図8】筒状のスリーブニップルを溶接にてコモンレー
ルとしての本管レールに取着した構成の従来のコモンレ
ールにおける分岐接続体の接続構造例を一部切欠いて示
す断面図である。FIG. 8 is a cross-sectional view, partially cut away, showing an example of a connection structure of a branch connection body in a conventional common rail having a configuration in which a tubular sleeve nipple is attached to a main pipe rail as a common rail by welding.
【図9】一体のボスを突設した従来のコモンレールにお
ける分岐接続体の接続構造例を示す横断面図である。FIG. 9 is a cross-sectional view showing an example of a connection structure of a branch connection body in a conventional common rail having an integral boss protruding therefrom.
1 本管レール 1′ ブロック・レール 1−1、1−1′ 流通路 1−1a 流通路内周面 1−2 分岐孔 1−2a R面取部 1−2b 分岐孔垂直部の内周面 1−2c 半径r1の滑らかな曲面 1−2d テーパー面 1−2e 半径r2の滑らかな曲面 1−2f 半径r3の滑らかな曲面 1−2g 半径R1の滑らかな曲面 1−2h 半径R2の滑らかな曲面 1−2i 半径r4の滑らかな曲面 1−3 受圧座面 2 分岐枝管 2−1 流路 2−2 接続頭部 2−3 押圧座面 3 継手金具 3−1 螺子壁 3−2 螺子部 3a、3b 筒状スリーブニップル 3c ボス 4 ナット 5 スリーブワッシャー 6 袋ナット 7 円形溝 8 ワッシャー P 開口端部 R R面取部の半径DESCRIPTION OF SYMBOLS 1 Main rail 1 'Block rail 1-1, 1-1' Flow passage 1-1a Inner peripheral surface of flow passage 1-2 Branch hole 1-2a R chamfered portion 1-2b Inner peripheral surface of vertical portion of branch hole 1-2c radius r 1 of the smoothly curved surface 1-2d tapered surface smooth curved surface of 1-2e radius r 2 of a smooth curved surface 1-2f radius r 3 1-2 g radii smoothly curved 1-2h radius R 1 R 2 Smooth curved surface 1-2i Smooth curved surface with radius r 4 1-3 Pressure receiving seat surface 2 Branch branch pipe 2-1 Flow path 2-2 Connection head 2-3 Press seat surface 3 Joint fitting 3-1 Screw wall 3-2 Screw part 3a, 3b Tubular sleeve nipple 3c Boss 4 Nut 5 Sleeve washer 6 Cap nut 7 Circular groove 8 Washer P Open end R Radius of chamfer
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 FI F16L 41/08 F16L 41/02 Z ──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. 6 Identification code FI F16L 41/08 F16L 41/02 Z
Claims (5)
るコモンレールの該流通路の軸方向の周壁部に間隔を保
持して複数の分岐孔を設け、かつ該分岐孔の周面部にそ
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
体の端部に設けた接続頭部のなす押圧座面部を当接係合
せしめ、コモンレールと一体もしくは別体の継手部分と
予め分岐接続体側に組込んだナットの螺合による前記接
続頭部での押圧に伴って締着して接続してなる分岐接続
体の接続構造において、前記分岐孔のコモンレール側開
口端部を円弧状に面取りしてエッジ部を有しない曲面に
形成したR面取部としたことを特徴とするコモンレール
における分岐接続体の接続構造。1. A common rail having a flow passage having a substantially circular cross section in a longitudinal direction, a plurality of branch holes are provided in a circumferential wall portion of the flow passage in an axial direction of the flow passage, and a plurality of branch holes are provided in a peripheral surface portion of the branch hole. A pressure receiving seat surface that opens to the outside is formed by connecting a branch connecting body having a flow path communicating with the flow passage, and a pressing seat surface portion formed by a connection head provided at an end of the branch connecting body is abutted. A connection structure of a branch connection body which is joined together and tightened and connected together with the joint head, which is integral with or separate from the common rail, and pressed by the connection head by screwing a nut previously incorporated into the branch connection body side. 3. The connection structure for a branch connector in a common rail according to claim 1, wherein the common rail side opening end of the branch hole is chamfered in an arc shape to form a curved surface having no edge.
コモンレール側開口端部は、R面取部の内周面における
輪郭が前記流通路の直径方向に長径の楕円形状であるこ
とを特徴とする請求項1記載のコモンレールにおける分
岐接続体の接続構造。2. A common rail-side opening end formed on a curved surface having no edge portion, wherein a contour of an inner peripheral surface of an R-chamfered portion has an elliptical shape having a longer diameter in a diameter direction of the flow passage. The connection structure of a branch connection body in the common rail according to claim 1.
と滑らかな曲面で連なったテーパー面と、該テーパー面
とコモンレール流通路内周面が滑らかな曲面で連なった
形状となしていることを特徴とする請求項1または2記
載のコモンレールにおける分岐接続体の接続構造。3. The cross-sectional shape of the R-chamfered portion is a tapered surface that is continuous with the inner peripheral surface of the branch hole in a smooth curved surface, and the tapered surface is a continuous curved inner surface of the common rail flow passage. The connection structure of a branch connection body in a common rail according to claim 1 or 2, wherein:
回転楕円面、回転放物線面、回転双曲線面の形状となし
ていることを特徴とする請求項1〜3のいずれか1項記
載のコモンレールにおける分岐接続体の接続構造。4. A cross-sectional shape of the R chamfered portion is a rotating arc surface,
The connection structure of a branch connection body in a common rail according to any one of claims 1 to 3, wherein the connection structure has a shape of a spheroid, a paraboloid of revolution, and a hyperboloid of revolution.
該コモンレールに取付けた継手金具もしくは筒状のスリ
ーブニップルからなり、または該コモンレールと一体の
継手部分は、ボスまたは円形溝からなることを特徴とす
る請求項1〜4のいずれか1項記載のコモンレールにお
ける分岐接続体の接続構造。5. A joint part separate from the common rail,
The common rail according to any one of claims 1 to 4, wherein the common rail is formed of a joint fitting or a tubular sleeve nipple attached to the common rail, or a joint part integral with the common rail is formed of a boss or a circular groove. Connection structure of the branch connection body in FIG.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9345776A JPH10213045A (en) | 1996-11-30 | 1997-12-01 | Connecting structure for branch connecting body in common rail |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33455096 | 1996-11-30 | ||
JP8-334550 | 1996-11-30 | ||
JP9345776A JPH10213045A (en) | 1996-11-30 | 1997-12-01 | Connecting structure for branch connecting body in common rail |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH10213045A true JPH10213045A (en) | 1998-08-11 |
Family
ID=26574872
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9345776A Withdrawn JPH10213045A (en) | 1996-11-30 | 1997-12-01 | Connecting structure for branch connecting body in common rail |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH10213045A (en) |
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