JPH10103189A - Connecting head part structure for high pressure injection pipe - Google Patents
Connecting head part structure for high pressure injection pipeInfo
- Publication number
- JPH10103189A JPH10103189A JP8277553A JP27755396A JPH10103189A JP H10103189 A JPH10103189 A JP H10103189A JP 8277553 A JP8277553 A JP 8277553A JP 27755396 A JP27755396 A JP 27755396A JP H10103189 A JPH10103189 A JP H10103189A
- Authority
- JP
- Japan
- Prior art keywords
- washer
- head part
- head
- press
- 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.)
- Granted
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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Joints With Pressure Members (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、一般にディゼル内
燃機関或いは各種の機械、装置等にあって、高圧燃料の
供給路等として配設される管径30m/m程度以下、肉
厚2.5m/m乃至12.0m/m程度の厚肉細径から
なる高圧噴射管の接続頭部構造の改良に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a diesel internal combustion engine or various machines and apparatuses, and has a pipe diameter of about 30 m / m or less and a wall thickness of 2.5 m provided as a high-pressure fuel supply path or the like. The present invention relates to an improvement in a connection head structure of a high-pressure injection pipe having a thin wall thickness of about 1 / m to 12.0 m / m.
【0002】[0002]
【従来の技術】従来、この種の接続頭部構造としては、
例えば図3に示すように、截頭円錐状の接続頭部(1
1)のなす首下部分を垂直に膨出した起立壁(11′)
となして形成せしめ、更に該起立壁部に当接位置する同
様の起立した鍔壁(12′)をもってなるワッシャー若
しくはスリーブ(12)を係圧して圧嵌構成されてい
た。尚(11″)は接続頭部(11)の軸方向への挫屈
成型に伴って出現する該頭部内部での環状ポケットであ
る。2. Description of the Related Art Conventionally, as this kind of connection head structure,
For example, as shown in FIG.
An upright wall (11 ') that vertically bulges the lower part of the neck made by 1)
Then, a washer or a sleeve (12) having a similar raised flange wall (12 ') positioned in contact with the raised wall portion is pressed and fitted. Reference numeral (11 ″) denotes an annular pocket inside the connection head (11) that appears as the connection head (11) buckles in the axial direction.
【0003】[0003]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の技術においては、接続頭部(11)の首下部
分のなす垂直からなる前記起立壁(11′)に関連し
て、内部に生ずるポケット(11″)部の底部が小さな
曲率半径を有するか、極端な場合にはエッジ状となり、
従って近年のように排気ガス規制の要求に基ずく燃料噴
射圧の高圧化に伴い該ポケット部に高圧の燃料による局
部応力の集中が発生することとなり、当然底部より径方
向の外方に向けてマイクロ亀裂(13)が発生し易い傾
向があり、またポケット(11″)部の周辺に前記接続
頭部(11)の挫屈成型時に発生する無数のヘアークラ
ックの成長をも招く等の問題を有するものであった。However, in such a prior art, the vertical wall (11 ') formed by the lower part of the neck of the connecting head (11) is formed inside the vertical wall. The bottom of the pocket (11 ") has a small radius of curvature or, in extreme cases, edge-like,
Accordingly, local stress concentration due to high-pressure fuel is generated in the pocket portion with the increase of the fuel injection pressure based on the requirement of the exhaust gas regulation as in recent years, and naturally the radially outward from the bottom portion. Micro cracks (13) tend to occur, and the number of hair cracks that occur during the buckling of the connection head (11) around the pocket (11 ″) is also increased. Had.
【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、特に接続頭部のなす首下部分を
傾斜面となして該頭部全体を算盤珠状となすことによ
り、内部のポケットでの底部を大きな曲率半径の弯曲面
となし、また、ワッシャーを厚肉からなる略平行四辺形
の形状となして形成せしめることとにより、ポケット底
部での高圧化に対する応力集中を緩和し、同時に接続状
態にあってワッシャーのなす前方の傾斜面での法線領域
をポケットの少なくとも底部に、また後方の傾斜面での
法線領域を該ポケット周辺の後方附近にそれぞれ向けて
構成せしめることにより、締付け力に伴う軸力によるそ
の厚肉部での潰れ・変形に対する機械的強度の増大によ
りその分力によってワッシャーを介して内部のポケット
周辺でのヘアークラックを圧接密合せしめ、燃料高圧化
に伴うその成長をも阻止することのできる高圧噴射管の
接続頭部構造を提供することを目的とするものである。[0004] The present invention has been made in view of the above-mentioned problems of the prior art, and in particular, the lower part of the neck formed by the connecting head is formed as an inclined surface, and the entire head is formed into an abacus bead. By forming the bottom of the pocket with a curved surface with a large radius of curvature and forming the washer into a generally parallelogram shape made of thick wall, stress concentration due to high pressure at the bottom of the pocket is reduced. The normal region on the front inclined surface formed by the washer is connected to at least the bottom of the pocket, and the normal region on the rear inclined surface is directed toward the rear near the pocket. As a result, the mechanical strength against crushing / deformation in the thick part due to the axial force accompanying the tightening force is increased, and the hair force around the internal pocket is increased by the component force via the washer. Tighten combined pressure dense click, it is an object to provide a connecting head structure for high-pressure injection pipe which can also inhibit the growth due to the fuel high pressure.
【0005】[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、厚肉細径からなる金属管の端部に截頭円錐状
の接続頭部を形成して該頭部の背面に筒環状のワッシャ
ーを圧嵌してなる構造において、前記接続頭部の首下部
分を後方への傾斜面となして該頭部を算盤珠状となすこ
とにより、内部のポケットの底部を大きな曲率半径の弯
曲面となし、更に該傾斜面に対応位置して係圧してなる
ワッシャーを厚肉からなる断面略平行四辺形の形状とな
してその圧嵌した接続状態にあって、該ワッシャーのな
す前方のテーパー面の法線領域を接続頭部のポケットの
少なくとも底部に、また後方のテーパー面の法線領域を
該ポケット部周辺の後方附近にそれぞれ向けて構成した
高圧噴射管の接続頭部構造を要旨とするものである。In order to achieve the above object, the present invention forms a frusto-conical connection head at the end of a metal tube having a thick wall and a small diameter, and forms a tube on the back of the head. In a structure in which an annular washer is press-fitted, the lower portion of the neck of the connection head is formed as an inclined surface toward the rear, and the head is formed in an abacus shape, so that the bottom of the internal pocket has a large radius of curvature. And a washer which is pressed against a position corresponding to the inclined surface is formed into a thick parallelepiped shape having a substantially parallelogram cross-section, and is in a press-fitted connection state, and is formed by the washer. The connection head structure of the high-pressure injection pipe is configured such that the normal region of the tapered surface is directed to at least the bottom of the pocket of the connection head, and the normal region of the rear tapered surface is directed toward the rear near the pocket. It is an abstract.
【0006】本発明は以上のように構成されているた
め、前記接続頭部のなす算盤珠状の形状による内部のポ
ケット底部での大きな曲率半径の弯曲面により、該底部
での高圧化に対する局部応力の集中を緩和して該底部で
の破断を効果的に防止することができ、同時に接続状態
にあってワッシャーの厚肉からなる略平行四辺形による
その前方の傾斜面での法線領域をポケットの底部或いは
全体に、また後方の傾斜面のなす法線領域を該ポケット
周辺の後方附近にそれぞれ向けて及ぼすこととなるた
め、締付けに伴う軸力による厚肉部での潰れ・変形に対
する機械的強度の増大によりその分力によって前記ポケ
ット周辺の無数のヘアークラックをワッシャーを介して
圧接、密合せしめる結果となり、従って前記ヘアークラ
ックの成長をも阻止することができることとなる。Since the present invention is constructed as described above, a curved surface having a large radius of curvature at the bottom of the inner pocket formed by the abacus having the connecting head has a local portion against a high pressure at the bottom. The concentration of stress can be reduced to effectively prevent the breakage at the bottom portion, and at the same time, the normal region on the front inclined surface by the substantially parallelogram formed of the thick wall of the washer in the connected state is reduced. Since the normal region formed by the bottom or entirety of the pocket and the rear inclined surface is directed toward the rear portion around the pocket, the machine against crushing / deformation at the thick portion due to the axial force due to the tightening. Due to the increase in the mechanical strength, the component force causes the innumerable hair cracks around the pockets to be pressed and brought together through washers, and thus the growth of the hair cracks is also prevented. So that the can.
【0007】[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は本発明の高圧噴射管の接続頭
部構造の一実施例に係る接続状態時の一部切欠き断面
図、図2は他の実施例の部分拡大断面図であって、
(1)は接続頭部であり、圧力配管用炭素鋼材或いはス
テンレス鋼材等からなる高圧燃料噴射管(P)として一
般に管径30m/m程度以下、肉厚2.5m/m乃至1
2.0m/m程度の厚肉細径をもって構成するものであ
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partially cutaway view of a connecting head structure according to an embodiment of the present invention. FIG. 2 is a partially enlarged cross-sectional view of another embodiment,
Reference numeral (1) denotes a connection head, which is generally a high-pressure fuel injection pipe (P) made of carbon steel or stainless steel for pressure piping, having a pipe diameter of about 30 m / m or less and a wall thickness of 2.5 m / m to 1 m.
It has a thick and small diameter of about 2.0 m / m.
【0008】そして従来技術による截頭円錐状の前記接
続頭部(1)の首下部分を後方への傾斜面(1′)とな
して該接続頭部(1)全体を算盤珠状に形成するもので
ある。The lower part of the neck of the connection head (1) in the form of a truncated cone according to the prior art forms an inclined surface (1 ') toward the rear, so that the entire connection head (1) is formed in an abacus shape. Is what you do.
【0009】一方(1″)は接続頭部(1)の軸方向へ
の挫屈成型時に発生する該接続頭部内部での環状ポケッ
トであり、その底部を大きな曲率半径の弯曲面となして
形成するのである。[0009] On the other hand, (1 ") is an annular pocket inside the connection head which is formed when the connection head (1) is subjected to buckling in the axial direction, and its bottom is formed as a curved surface having a large radius of curvature. It forms.
【0010】また、(2)はワッシャーであり、金属材
による厚肉をもって断面略平行四辺形の環状となして成
形されたものであって、前記算盤珠状の接続頭部(1)
の首下部分の傾斜面(1′)に対応位置して係圧して圧
嵌せしめるものである。なおこの明細書において「断面
略平行四辺形」とは図1に示すように略正平行四辺形の
みならず、図2のように前方のテーパー面(2′)とそ
の後方のテーパー面(2″)の中心角が異なるものも含
み、従ってワッシャー(2)の前方のテーパー面
(2′)の中心角(α)が45〜90°、後方のテーパ
ー面(2″)の中心角(β)が60〜120°の範囲に
あるものを含むことを意味する。[0010] Further, (2) is a washer, which is formed by forming a thick wall made of a metal material into an annular shape having a substantially parallelogram cross section, and the abacus-shaped connecting head (1).
Of the lower part of the neck corresponding to the inclined surface (1 '). In this specification, "substantially parallelogram cross section" means not only a substantially equilateral parallelogram as shown in FIG. 1, but also a tapered surface (2 ') at the front and a tapered surface (2') at the rear as shown in FIG. )), The central angle (α) of the front tapered surface (2 ′) of the washer (2) is 45 to 90 °, and the central angle (β) of the rear tapered surface (2 ″). ) Is included in the range of 60 to 120 °.
【0011】そしてワッシャー(2)を接続頭部(1)
の首下部分の傾斜面(1′)に圧嵌した接続状態にあっ
て、該ワッシャー(2)のなす前方のテーパー面
(2′)での法線領域をポケット(1″)の底部、好ま
しくは該ポケット全体に、またその後方のテーパー面
(2″)での法線領域を該ポケット周辺の後方附近にそ
れぞれ向けて構成し、これによって締付けに伴う厚肉部
での、潰れ・変形に対する機械的強度の増大によりその
分力によって前記ポケット(1″)周辺の無数のヘアー
クラックをワッシャー(2)を介して圧接、密合せし
め、前記ヘアークラックの成長をも阻止するするもので
ある。Then, the washer (2) is connected to the connection head (1).
In a connection state in which the washer (2) is press-fitted to the inclined surface (1 ') of the lower part of the neck, the normal area of the forward tapered surface (2') formed by the washer (2) is the bottom of the pocket (1 "). Preferably, the entire pocket and the normal area at the rear tapered surface (2 ") are respectively formed toward the rear vicinity of the periphery of the pocket, thereby crushing and deforming at the thick part due to tightening. Due to the increase in mechanical strength, the innumerable hair cracks around the pockets (1 ") are pressed and brought together through the washers (2) by the component force, thereby preventing the growth of the hair cracks. .
【0012】尚(3)は締付けナットであり、(4)は
ノズルホルダー等の被接続部であって締付けナット
(3)をもって螺着してなるものである。Reference numeral (3) denotes a tightening nut, and (4) denotes a connected portion such as a nozzle holder, which is screwed with the tightening nut (3).
【0013】[0013]
【発明の効果】以上説明したように本発明による高圧噴
射管の接続頭部構造は、特に接続頭部(1)の首下部分
を傾斜面(1′)となして該頭部を算盤珠状となすのに
関連して、厚肉からなる前記ワッシャー(2)の形状に
よるその前後両方の傾斜面(2′)および(2″)によ
るそれぞれの法線領域を前記方向に向けて構成するた
め、ポケット(1″)のなす底部の大きな曲率半径の弯
曲面によって高圧化に対する局部応力の集中を緩和して
該底部での破断を効果的に防止せしめることができ、ま
た同時に接続状態にあって締付け力に伴う軸力によりそ
の厚肉部での潰れ・変形に対する機械的強度の増大によ
りその分力によって、前記法線領域に位置するポケット
(1″)周辺での無数のヘアークラックを圧接、密合せ
しめてその成長を阻止することができる等、極めて有用
な高圧噴射管の接続頭部構造である。As described above, the connecting head structure of the high-pressure injection pipe according to the present invention has a slant surface (1 ') at the lower part of the connecting head (1). In relation to the shape, the respective normal regions by the inclined surfaces (2 ′) and (2 ″) on both the front and rear due to the shape of the washer (2) made of a thick wall are directed toward the direction. Therefore, the curved surface of the bottom of the pocket (1 ") having a large radius of curvature can relieve the concentration of local stress due to high pressure, effectively preventing breakage at the bottom, and at the same time in the connection state. By increasing the mechanical strength against crushing / deformation in the thick part due to the axial force accompanying the tightening force, countless hair cracks around the pocket (1 ″) located in the normal area are pressed by the component force. Close together to prevent their growth Etc. can be a connection head structure of a very useful high-pressure injection pipe.
【図1】本発明の実施例に係る高圧噴射管の接続頭部構
造の一実施例の接続状態時の一部切欠き断面図である。FIG. 1 is a partially cutaway sectional view of a connection state of a connection head structure of a high-pressure injection pipe according to an embodiment of the present invention in a connection state.
【図2】本発明の他の実施例の部分拡大断面図である。FIG. 2 is a partially enlarged cross-sectional view of another embodiment of the present invention.
【図3】従来例を示す高圧噴射管の接続頭部構造の一部
切欠き断面図である。FIG. 3 is a partially cutaway sectional view of a connection head structure of a high-pressure injection pipe showing a conventional example.
1 接続頭部 1′ 傾斜面 1″ ポケット 2 ワッシャー 2′ テーパー面 2″ テーパー面 α、β 中心角 Reference Signs List 1 connection head 1 'inclined surface 1 "pocket 2 washer 2' taper surface 2" taper surface α, β central angle
Claims (1)
部を形成して該頭部の背面に筒環状のワッシャーを圧嵌
してなる構造において、前記接続頭部(1)の首下部分
を後方への傾斜面(1′)となして該頭部を算盤珠状と
なすことにより、内部のポケット(1″)の底部を大き
な曲率半径の弯曲面となし、更に該傾斜面に対応位置し
て係圧してなるワッシャー(2)を厚肉からなる断面略
平行四辺形の形状となしてその圧嵌した接続状態にあっ
て、該ワッシャーのなす前方のテーパー面(2′)の法
線領域を接続頭部(1)のポケット(1″)の少なくと
も底部に、また後方のテーパー面(2″)の法線領域を
該ポケット部周辺の後方附近にそれぞれ向けて構成した
ことを特徴とする高圧噴射管の接続頭部構造。1. A structure in which a connection head is formed at an end of a metal tube having a large thickness and a small diameter, and a cylindrical annular washer is press-fitted on the back of the head. By forming the lower part of the neck as a rearward inclined surface (1 ') and forming the head in an abacus shape, the bottom of the inner pocket (1 ") is formed into a curved surface with a large radius of curvature. A washer (2) pressed against the inclined surface is formed into a thick parallelepiped shape having a substantially parallelogram cross section, and is in a press-fit connection state, and the forward tapered surface (2) formed by the washer is formed. ′) With the normal region facing at least the bottom of the pocket (1 ″) of the connecting head (1) and the normal region of the rear tapered surface (2 ″) facing the rear near the pocket. Connection head structure of high-pressure injection pipe characterized by the following.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27755396A JP3882951B2 (en) | 1996-09-27 | 1996-09-27 | High pressure injection pipe connection head structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27755396A JP3882951B2 (en) | 1996-09-27 | 1996-09-27 | High pressure injection pipe connection head structure |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH10103189A true JPH10103189A (en) | 1998-04-21 |
JP3882951B2 JP3882951B2 (en) | 2007-02-21 |
Family
ID=17585141
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP27755396A Expired - Fee Related JP3882951B2 (en) | 1996-09-27 | 1996-09-27 | High pressure injection pipe connection head structure |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3882951B2 (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002257005A (en) * | 2001-03-01 | 2002-09-11 | Usui Internatl Ind Co Ltd | Connection head structure of high pressure fuel injection pipe |
JP2005002806A (en) * | 2003-06-09 | 2005-01-06 | Usui Kokusai Sangyo Kaisha Ltd | Joint structure of high pressure fuel injection pipe |
JP2005009394A (en) * | 2003-06-18 | 2005-01-13 | Usui Kokusai Sangyo Kaisha Ltd | Connection structure for common rail branch connector |
KR100630544B1 (en) | 2003-05-29 | 2006-09-29 | 닛타.무어가부시키카이샤 | Pipe joint |
JP2007100696A (en) * | 2005-10-01 | 2007-04-19 | Man Diesel Sa | Pressure pipe with formed connection head |
KR100715711B1 (en) | 2004-06-17 | 2007-05-08 | 우수이 고쿠사이 산교 가부시키가이샤 | Joint structure of diverging branch pipe in fuel rail for internal combustion engine, diverging branch pipe and manufacturing method of its diverging branch pipe |
GB2438414A (en) * | 2006-05-23 | 2007-11-28 | Delphi Tech Inc | Pipe to fuel injector connector allows misalignment and flow path for leakage |
CN102341634A (en) * | 2009-03-05 | 2012-02-01 | 盖茨公司 | Tube connector |
WO2014042912A1 (en) * | 2012-09-11 | 2014-03-20 | The Gates Corporation | Fluid coupling |
JP2014095472A (en) * | 2012-11-12 | 2014-05-22 | Ti Automotive (Heidelberg) Gmbh | Screw connection device for pipe, in particular pipe for vehicle installed with engine |
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JP2002257005A (en) * | 2001-03-01 | 2002-09-11 | Usui Internatl Ind Co Ltd | Connection head structure of high pressure fuel injection pipe |
KR100630544B1 (en) | 2003-05-29 | 2006-09-29 | 닛타.무어가부시키카이샤 | Pipe joint |
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JP2007100696A (en) * | 2005-10-01 | 2007-04-19 | Man Diesel Sa | Pressure pipe with formed connection head |
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GB2438414A (en) * | 2006-05-23 | 2007-11-28 | Delphi Tech Inc | Pipe to fuel injector connector allows misalignment and flow path for leakage |
JP2012519814A (en) * | 2009-03-05 | 2012-08-30 | ザ ゲイツ コーポレイション | Tube connector |
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WO2014042912A1 (en) * | 2012-09-11 | 2014-03-20 | The Gates Corporation | Fluid coupling |
JP2014095472A (en) * | 2012-11-12 | 2014-05-22 | Ti Automotive (Heidelberg) Gmbh | Screw connection device for pipe, in particular pipe for vehicle installed with engine |
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 |
JPWO2017094401A1 (en) * | 2015-11-30 | 2018-08-16 | 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 |
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EP4089276A1 (en) * | 2021-04-29 | 2022-11-16 | Duncha France | Device for supplying fuel |
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