JP2001227431A - Fuel injection pipe for diesel engine - Google Patents
Fuel injection pipe for diesel engineInfo
- Publication number
- JP2001227431A JP2001227431A JP2000344055A JP2000344055A JP2001227431A JP 2001227431 A JP2001227431 A JP 2001227431A JP 2000344055 A JP2000344055 A JP 2000344055A JP 2000344055 A JP2000344055 A JP 2000344055A JP 2001227431 A JP2001227431 A JP 2001227431A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- fuel injection
- diesel engine
- injection pipe
- orifice
- 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
Landscapes
- Fuel-Injection Apparatus (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ディーゼル内燃機
関のコモンレールシステムや、Ｐ−Ｌ−Ｄ（ポンプ・ラ
イン・デリバリー）噴射システム（以下「Ｐ−Ｌ−Ｄ噴
射システム」と称する）などに接続して用いる高圧燃料
の噴射管に関するものである。The present invention relates to a common rail system of a diesel internal combustion engine, a PLD (pump line delivery) injection system (hereinafter referred to as a "PLD injection system"), and the like. The present invention relates to a high-pressure fuel injection pipe used as a fuel tank.
【０００２】[0002]
【従来の技術】従来、この種のディーゼルエンジン用燃
料噴射管としては、例えば図１３に示すように、厚肉鋼
管１１の端部に設けてなる外側周面をシート面１３とす
る截頭円錐状の接続頭部１２、あるいは図１４に示すよ
うに厚肉鋼管２１の端部に設けてなる外側周面を球面状
のシート面２３とする接続頭部２２が、それぞれ外方か
らのパンチ部材による軸芯方向への押圧による挫屈加工
によって成形されるのに関連して、該押圧による挫屈加
工に伴う周壁の外側への拡がりによって、該頭部内側に
環状のポケット１５−１（図１３）、あるいは環状のノ
ッチ１５−２（図１４）を生ぜしめて構成され、かかる
状態で使用に供されている現状にある。なお、１４は接
続頭部の背後に嵌着されたスリーブワッシャ、１６は締
付けナットである。2. Description of the Related Art Conventionally, as a fuel injection pipe for a diesel engine of this type, as shown in FIG. 13, for example, a truncated cone having an outer peripheral surface provided at an end of a thick steel pipe 11 having a seat surface 13 is used. The connecting heads 12 each having a spherical shape and the outer peripheral surface provided at the end of a thick steel pipe 21 having a spherical sheet surface 23 as shown in FIG. In connection with being formed by the buckling process by pressing in the axial direction by the buckling, due to the outward expansion of the peripheral wall accompanying the buckling process by the pressing, an annular pocket 15-1 (FIG. 13) or an annular notch 15-2 (FIG. 14) is formed and used in such a state. 14 is a sleeve washer fitted behind the connection head, and 16 is a fastening nut.
【０００３】このようなディーゼルエンジン用燃料噴射
管を採用した燃料噴射システムにおいて、該燃料噴射管
は配管内の圧力損失を生じさせることなく燃焼室内へ十
分な量を噴射できるようにするためと配管上の利便さを
考慮して短かくなっている。しかし、このような短い噴
射管でも、燃料噴射後弁が閉じる時には該噴射管内には
圧力変動が起きる。この圧力変動は脈動となって配管内
からコモンレール内などにも達し、さらに次の気筒の噴
射管にも影響を与えるために安定した燃料の噴射を行う
ことができないという問題が発生した。[0003] In a fuel injection system employing such a fuel injection pipe for a diesel engine, the fuel injection pipe is designed to be capable of injecting a sufficient amount into a combustion chamber without causing pressure loss in the pipe. It is shorter in consideration of the above convenience. However, even with such a short injection pipe, pressure fluctuations occur in the injection pipe when the valve closes after fuel injection. This pressure fluctuation causes pulsation to reach from the inside of the pipe to the inside of the common rail, and further affects the injection pipe of the next cylinder, so that there has been a problem that stable fuel injection cannot be performed.
【０００４】[0004]
【発明が解決しようとする課題】かかる対策としては、
例えば噴射管やコモンレールの内径を大きくして管の容
積を増やすことにより圧力変動を小さくすることは可能
であるが、脈動が速く伝わるという欠点が生じる。そこ
で、脈動を低く抑えかつ伝播を遅くかつ少なくするため
にコモンレールにオリフィスを設ける方法が開発され
た。この方法には、コモンレールに設ける分岐孔の径を
より小さくしてオリフィス機能を付与する方法と、コモ
ンレールの分岐孔の部分にオリフィス付きの金属リング
部材（駒）を介在させる方法が知られており、いずれの
方法も脈動を低く抑えかつ伝播を遅くすることは可能で
ある。しかし、コモンレールにおいて分岐孔の径をより
小さくしてオリフィス機能を付与する方法は、分岐孔部
に高圧の繰返し圧力がかかるために肉厚の最も薄いとこ
ろでも７ｍｍ以上あり、さらにコモンレール端面から深
い位置での加工となるためオリフィスの形成が容易でな
いという難点がある。また、オリフィス付きの金属リン
グ部材（駒）を分岐孔部に介在させる方法は、噴射管側
に組込んだ一つの締付け用ナットによる軸力でコモンレ
ールと金属リング部材との間および噴射管と金属リング
部材との間の２箇所をシールするためにシールの安定性
に乏しいという欠点がある。Problems to be solved by the invention are as follows.
For example, it is possible to reduce the pressure fluctuation by increasing the inner diameter of the injection tube or the common rail to increase the volume of the tube, but there is a disadvantage that pulsation is transmitted quickly. Therefore, a method of providing an orifice in the common rail has been developed in order to suppress pulsation and slow and reduce propagation. As this method, there are known a method of providing an orifice function by making the diameter of a branch hole provided in the common rail smaller and a method of interposing a metal ring member (piece) with an orifice in the branch hole of the common rail. Either way, it is possible to keep the pulsation low and slow the propagation. However, the method of imparting an orifice function by making the diameter of the branch hole smaller in the common rail is to apply a high pressure repeatedly to the branch hole portion, so that the thinnest wall has a thickness of 7 mm or more even at the thinnest part, and a position deeper than the common rail end face. Therefore, there is a disadvantage that the formation of the orifice is not easy because the process is performed at a temperature. In addition, a method of interposing a metal ring member (piece) with an orifice in the branch hole is performed by using an axial force of one fastening nut incorporated in the injection pipe side between the common rail and the metal ring member, and between the injection pipe and the metal pipe. There is a disadvantage in that the seal between the two parts between the ring member and the ring member has poor stability.
【０００５】本発明の目的は、上記した従来の問題を解
決するためになされたもので、噴射管の管端部にオリフ
ィス管を設けることにより、脈動を低く抑えかつ伝播を
遅くかつ少なくして安定した燃料の噴射を行うことがで
きるディーゼルエンジン用燃料噴射管を提供することで
ある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems. By providing an orifice tube at the end of the injection tube, pulsation can be suppressed low and propagation can be reduced and reduced. An object of the present invention is to provide a fuel injection pipe for a diesel engine that can perform stable fuel injection.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
本発明は、円錐もしくは球面状シート面を有する頭部と
締付けナットを有するディーゼルエンジン用燃料噴射管
において、少なくとも片側、好ましくはコモンレール
側、Ｐ−Ｌ−Ｄ噴射システムにおいてはポンプ側の管端
部付近の管内に管路径より小径もしくは同一径の外径を
有するオリフィス管を管端もしくは管端より内部に設け
た構成となしたことを要旨とするものである。また、前
記オリフィス管は外部からの縮径力により管内部に固定
したり、あるいは一端が管端より外部に突出した突出部
を有していたり、さらに前記突出部は管路径より大径の
フランジ部を有していたり、または硬質金属製の管体
と、管端より外部に突出した当該管体の一端に外嵌した
軟質金属製のリングとからなるものや、硬質金属製の内
管と、管端より外部に突出したフランジ部を有する軟質
金属製の外管とからなるものを用いることができる。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a fuel injection pipe for a diesel engine having a head having a conical or spherical seat surface and a tightening nut, at least one side, preferably a common rail side. In the P-L-D injection system, an orifice pipe having a smaller diameter than the pipe diameter or an outer diameter equal to the pipe diameter is provided in the pipe near the pipe end on the pump side. It is an abstract. The orifice pipe may be fixed inside the pipe by a diameter reducing force from the outside, or may have a protruding part whose one end protrudes outside from the pipe end. Or a hard metal tube, and a soft metal ring externally fitted to one end of the tube protruding outside from the tube end, or a hard metal inner tube. And a soft metal outer tube having a flange portion protruding outside from the tube end.
【０００７】すなわち、本発明は燃料噴射管の接続頭部
の先端開口部もしくは先端開口部より内側にオリフィス
管を設けることにより、このオリフィス管がオリフィス
の役目をしてシール性に悪影響を与えずに、脈動を低く
抑えかつ伝播を遅くかつ少なくして安定した燃料の噴射
を行うことができるように構成したものである。また、
フランジ部やリングが軟質であると、締付けナットの軸
力を相殺することがなく、シール面圧を降下させること
がない。That is, according to the present invention, the orifice pipe is provided inside the tip opening of the connection head of the fuel injection pipe or inside the tip opening, so that the orifice pipe functions as an orifice and does not adversely affect the sealing performance. In addition, the pulsation is suppressed low and the propagation is slow and reduced, so that stable fuel injection can be performed. Also,
When the flange portion and the ring are soft, the axial force of the tightening nut is not canceled and the sealing surface pressure does not decrease.
【０００８】なお、本発明におけるオリフィス管の固定
手段としては、圧入、かしめ、ローリング、焼きばめ、
ろう付け、溶接あるいはフランジ部の相手シート面との
間への挟込みなどの手段を用いることができる。The means for fixing the orifice tube in the present invention includes press fitting, caulking, rolling, shrink fitting,
Means such as brazing, welding, or sandwiching the flange portion with the mating sheet surface can be used.
【０００９】[0009]
【発明の実施の形態】図１〜図８は本発明のディーゼル
エンジン用燃料噴射管を例示したもので、図１は本発明
のディーゼルエンジン用燃料噴射管の第１実施態様を示
す縦断面図、図２は同じく本発明の第２実施態様を示す
縦断面図、図３は同じく本発明の第３実施態様の一実施
例を示す縦断面図、図４は同じく本発明の第３実施態様
の他の実施例を示すを示す縦断面図、図５は同じく本発
明の第４実施態様を示す縦断面図、図６は同じく本発明
の第５実施態様を示す縦断面図、図７は同じく本発明の
第６実施態様を示す縦断面図、図８は同じく本発明の第
７実施態様を示す縦断面図、図９は図１に示すディーゼ
ルエンジン用燃料噴射管をコモンレールに適用した接続
構造例を示す縦断面図、図１０は図２に示すディーゼル
エンジン用燃料噴射管をコモンレールに適用した接続構
造例を示す縦断面図、図１１は図７に示すディーゼルエ
ンジン用燃料噴射管をコモンレールに適用した接続構造
例を示す縦断面図、図１２は図８に示すディーゼルエン
ジン用燃料噴射管をコモンレールに適用した接続構造例
を示す縦断面図であり、１は燃料噴射管、２は接続頭
部、３ａ、３ｂ、３ｃ、３ｄ、３ｅ、３ｆ、３ｇはオリ
フィス管、４は締付け用ナット、５はスリーブワッシ
ャ、６は本管レール、７はＰ−Ｌ−Ｄ噴射システムにお
けるポンプボディーである。1 to 8 show a fuel injection pipe for a diesel engine according to the present invention. FIG. 1 is a longitudinal sectional view showing a first embodiment of a fuel injection pipe for a diesel engine according to the present invention. FIG. 2 is a longitudinal sectional view showing a second embodiment of the present invention, FIG. 3 is a longitudinal sectional view showing an example of a third embodiment of the present invention, and FIG. 4 is a third embodiment of the present invention. FIG. 5 is a longitudinal sectional view showing a fourth embodiment of the present invention, FIG. 6 is a longitudinal sectional view showing a fifth embodiment of the present invention, and FIG. Similarly, FIG. 8 is a longitudinal sectional view showing a sixth embodiment of the present invention, FIG. 8 is a longitudinal sectional view showing a seventh embodiment of the present invention, and FIG. 9 is a connection in which the fuel injection pipe for a diesel engine shown in FIG. FIG. 10 is a longitudinal sectional view showing a structural example, and FIG. FIG. 11 is a longitudinal sectional view showing an example of a connection structure in which a pipe is applied to a common rail, FIG. 11 is a longitudinal sectional view showing an example of a connection structure in which a fuel injection pipe for a diesel engine shown in FIG. 7 is applied to a common rail, and FIG. It is a longitudinal cross-sectional view which shows the connection structure example which applied the fuel injection pipe for engines to a common rail, 1 is a fuel injection pipe, 2 is a connection head, 3a, 3b, 3c, 3d, 3e, 3f, 3g is an orifice pipe, 4 is a fastening nut, 5 is a sleeve washer, 6 is a main rail, and 7 is a pump body in the P-L-D injection system.
【００１０】まず、図１に示すディーゼルエンジン用燃
料噴射管１は、厚肉鋼管１−１の端部に設けてなる外側
周面をシート面２−１ａとする截頭円錐状の接続頭部２
の開口端部に、フランジ３ａ−１を有し厚肉鋼管１−１
の管路１−３の直径とほぼ同一径の外径を有するオリフ
ィス管３ａを内嵌固着して構成したもので、該オリフィ
ス管３ａのフランジ３ａ−１は管路１−３の直径より大
径で、かつ管端より外部に突出している。このオリフィ
ス管３ａの固着手段としては、前記したごとく圧入、か
しめ、ローリング、焼きばめ、ろう付け、溶接などの手
段を用いて行うが、必ずしも固着しなくてもよい。この
ディーゼルエンジン用燃料噴射管１には締付け用ナット
４とスリーブワッシャ５が予め厚肉鋼管１−１に外嵌さ
れている。First, a fuel injection pipe 1 for a diesel engine shown in FIG. 1 has a frusto-conical connection head having an outer peripheral surface provided at an end of a thick steel pipe 1-1 and having a seat surface 2-1a. 2
Has a flange 3a-1 at the opening end of the thick steel pipe 1-1.
Orifice pipe 3a having an outer diameter substantially the same as the diameter of the pipe line 1-3 is fixedly fitted therein. The flange 3a-1 of the orifice pipe 3a is larger than the diameter of the pipe line 1-3. It has a diameter and protrudes outside from the pipe end. As means for fixing the orifice tube 3a, as described above, press-fitting, caulking, rolling, shrink fitting, brazing, welding, or the like is used, but it is not always necessary to fix. A fastening nut 4 and a sleeve washer 5 are externally fitted to the thick steel pipe 1-1 in advance on the fuel injection pipe 1 for a diesel engine.
【００１１】図２に示すディーゼルエンジン用燃料噴射
管１は、オリフィス管３ｂ以外は前記図１と同様の構成
で、厚肉鋼管１−１の端部に設けてなる外側周面をシー
ト面２−１ａとする截頭円錐状の接続頭部２の開口端部
に、フランジ３ｂ−１を有し厚肉鋼管１−１の管路１−
３の直径とほぼ同一径の外径を有するオリフィス管３ｂ
を内嵌固着して構成したもので、このオリフィス管３ｂ
のフランジ３ｂ−１は相手部材に接触して固定されるよ
うに、厚肉となしてその外周端面に前記接続頭部２のシ
ート面２−１ａと同じ傾斜面となすシート面３ｂ−２を
設けている。なお、前記オリフィス管３ｂの開口端部は
図示のごとく外側に広がる緩いテーパ孔３ｂ−３を形成
してもよい。The fuel injection pipe 1 for a diesel engine shown in FIG. 2 has the same structure as that of FIG. 1 except for the orifice pipe 3b, and the outer peripheral surface provided at the end of the thick steel pipe 1-1 has a seat surface 2 The flange 1b-1 has a flange 3b-1 at the open end of the frusto-conical connection head 2 to be referred to as -1a.
Orifice tube 3b having an outer diameter substantially equal to the diameter of the orifice 3
The orifice tube 3b
The flange 3b-1 is made thick and has a sheet surface 3b-2 which forms the same inclined surface as the sheet surface 2-1a of the connection head 2 on its outer peripheral end surface so as to be fixed in contact with the mating member. Provided. The opening end of the orifice tube 3b may be formed with a gently tapered hole 3b-3 extending outward as shown in the figure.
【００１２】図３および図４に示すディーゼルエンジン
用燃料噴射管１は、オリフィス管３ｃ、３ｃ′以外は前
記図１と同様の構成で、図３は厚肉鋼管１−１の端部に
設けてなる外側周面をシート面２−１ａとする截頭円錐
状の接続頭部２の開口端部に、厚肉鋼管１−１の管路１
−３の直径とほぼ同一径の外径を有するオリフィス管３
ｃを内嵌固着して構成したもので、このオリフィス管３
ｃはその先端部外周に凹部３ｃ−１を予め形成してお
き、あるいは頭部と同時に成形して頭部成形時に前記凹
部３ｃ−１に塑性流動させて固定するものである。すな
わちこのオリフィス管３ｃは図３に示すごとくその開口
端面が接続頭部２の先端面とほぼ面一となるようにその
開口端部をかしめて接続頭部２に固定している。また図
４ではオリフィス管３ｃ′のほぼ中間部に凹部３ｃ′−
１を予め形成しておき、あるいは頭部と同時に成形して
頭部成形時に前記凹部３ｃ′−１に塑性流動させ、該オ
リフィス管の先端をその接続頭部２の先端面より突出さ
せて接続頭部２に固定してもよい。The fuel injection pipe 1 for a diesel engine shown in FIGS. 3 and 4 has the same structure as that of FIG. 1 except for the orifice pipes 3c and 3c '. FIG. 3 is provided at the end of the thick steel pipe 1-1. At the open end of the frusto-conical connecting head 2 having the outer peripheral surface formed of the sheet surface 2-1a,
Orifice tube 3 having an outer diameter substantially the same as the diameter of -3
c is internally fixed and fixed.
c indicates that a concave portion 3c-1 is formed in advance on the outer periphery of the distal end portion, or the concave portion 3c-1 is formed at the same time as the head portion, and plastically flows into the concave portion 3c-1 when the head portion is formed and is fixed. That is, as shown in FIG. 3, the orifice tube 3c is fixed to the connection head 2 by caulking its open end so that its open end surface is substantially flush with the distal end surface of the connection head 2. Further, in FIG. 4, a concave portion 3c'-
1 is formed in advance, or is molded simultaneously with the head and plastically flows into the concave portion 3c'-1 at the time of molding the head, and the orifice tube is connected by protruding from the distal end surface of the connection head 2 at the tip thereof. It may be fixed to the head 2.
【００１３】図５に示すディーゼルエンジン用燃料噴射
管１は、オリフィス管３ｄ以外は前記図１と同様の構成
で、厚肉鋼管１−１の端部に設けてなる外側周面をシー
ト面２−１ａとする截頭円錐状の接続頭部２の開口端部
に、厚肉鋼管１−１の管路１−３の直径とほぼ同一径の
外径を有するオリフィス管３ｄを凹凸嵌合方式により内
嵌固着して構成したもので、前記オリフィス管３ｄは接
続頭部２の押圧座屈加工に伴って生ずる環状凹溝２−１
ｂをその環状凸部３ｄ−１にて覆設する状態で接続頭部
１−２内に嵌着されている。The fuel injection pipe 1 for a diesel engine shown in FIG. 5 has the same configuration as that of FIG. 1 except for the orifice pipe 3d, and the outer peripheral surface provided at the end of the thick steel pipe 1-1 has a seat surface 2 An orifice pipe 3d having an outer diameter substantially the same as the diameter of the conduit 1-3 of the thick-walled steel pipe 1-1 is fitted to the open end of the frusto-conical connection head 2 as -1a. The orifice tube 3d is formed by an annular groove 2-1 which is produced by pressing and buckling of the connection head 2.
b is fitted in the connection head 1-2 in a state of being covered by the annular projection 3d-1.
【００１４】図６に示すディーゼルエンジン用燃料噴射
管１は、オリフィス管３ｅ以外は前記図１と同様の構成
で、厚肉鋼管１−１の端部に設けてなる外側周面をシー
ト面２−１ａとする截頭円錐状の接続頭部２の開口端部
に、厚肉鋼管１−１の管路１−３の直径とほぼ同一径の
外径を有するオリフィス管３ｅを接続頭部２の開口端よ
り内側に内嵌固着して構成したもので、このオリフィス
管３ｅの場合は、予め該オリフィス管の一部に縮径部３
ｅ−１を形成しておき、接続頭部２の成形時やカシメ、
ローリングなどにより厚肉鋼管１−１の肉厚を外部より
前記縮径部３ｅ−１に塑性流動させて固定している。な
おオリフィス管３ｅを接続頭部２の開口端と面一にせず
に内側に設け、接続頭部２より上流側をかしめるように
したのは、頭部成形時にシート面２−１ａを損傷しない
ようにするためである。なお、オリフィス管は必ずしも
固定する必要はないが、固定する場合はろう付、焼きば
め、溶接、圧入などでもよい。The fuel injection pipe 1 for a diesel engine shown in FIG. 6 has the same structure as that of FIG. 1 except for the orifice pipe 3e, and the outer peripheral surface provided at the end of the thick steel pipe 1-1 has a seat surface 2 An orifice pipe 3e having an outer diameter substantially the same as the diameter of the conduit 1-3 of the thick-walled steel pipe 1-1 is connected to the open end of the frusto-conical connection head 2 as -1a. In the case of the orifice tube 3e, a reduced diameter portion 3 is previously provided in a part of the orifice tube.
e-1 is formed, and the connecting head 2 is formed and caulked,
The thickness of the thick steel pipe 1-1 is plastically flown from the outside to the reduced diameter portion 3e-1 by rolling or the like and fixed. The reason why the orifice tube 3e is provided on the inner side without being flush with the opening end of the connection head 2 so that the upstream side of the connection head 2 is caulked does not damage the sheet surface 2-1a at the time of forming the head. That's why. The orifice tube is not necessarily fixed, but may be fixed by brazing, shrink fitting, welding, press fitting, or the like.
【００１５】図７に示すディーゼルエンジン用燃料噴射
管１は、オリフィス管３ｆ以外は前記図１〜図６と同様
の構成で、厚肉鋼管１−１の端部に設けてなる外側周面
をシート面２−１ａとする截頭円錐状の接続頭部２の開
口端部に、厚肉鋼管１−１の管路１−３の直径とほぼ同
一径の外径を有する硬質金属製の管体３ｆ−１と、該管
体３ｆ−１の先端部に外嵌した軟質金属製のリング３ｆ
−２とからなるオリフィス管３ｆを内嵌固着して構成し
たもので、このオリフィス管３ｆの軟質金属製のリング
３ｆ−２は相手部材に接触して固定されるように厚肉と
なしている。The fuel injection pipe 1 for a diesel engine shown in FIG. 7 has the same configuration as that of FIGS. 1 to 6 except for the orifice pipe 3f, and has an outer peripheral surface provided at the end of the thick steel pipe 1-1. At the open end of the frusto-conical connection head 2 having the seat surface 2-1a, a hard metal pipe having an outer diameter substantially equal to the diameter of the conduit 1-3 of the thick steel pipe 1-1. Body 3f-1 and a soft metal ring 3f externally fitted to the tip of the tubular body 3f-1
The orifice tube 3f is made of a thick metal so that the soft metal ring 3f-2 of the orifice tube 3f is fixed in contact with the mating member. .
【００１６】図８に示すディーゼルエンジン用燃料噴射
管１は、オリフィス管３ｇ以外は前記図１〜図６と同様
の構成で、厚肉鋼管１−１の端部に設けてなる外側周面
をシート面２−１ａとする截頭円錐状の接続頭部２の開
口端部に、厚肉鋼管１−１の管路１−３の直径とほぼ同
一径の外径を有しかつ先端部にフランジ部３ｇ−２′を
有する軟質金属製の外管３ｇ−２と、この外管とほぼ同
一肉厚の硬質金属製の内管３ｇ−１とからなるオリフィ
ス管３ｇを内嵌固着して構成したもので、このオリフィ
ス管３ｇの外管３ｇ−２のフランジ部３ｇ−２′は相手
部材に接触して固定されるように厚肉となしている。The fuel injection pipe 1 for a diesel engine shown in FIG. 8 has the same configuration as that of FIGS. 1 to 6 except for the orifice pipe 3g, and has an outer peripheral surface provided at the end of the thick steel pipe 1-1. The open end of the frusto-conical connection head 2 having the seat surface 2-1a has an outer diameter substantially equal to the diameter of the conduit 1-3 of the thick-walled steel pipe 1-1, and An orifice tube 3g consisting of a soft metal outer tube 3g-2 having a flange portion 3g-2 'and a hard metal inner tube 3g-1 having substantially the same thickness as the outer tube is internally fitted and fixed. The flange 3g-2 'of the outer tube 3g-2 of the orifice tube 3g is made thick so as to be in contact with and fixed to the mating member.
【００１７】次に、前記図１に示すディーゼルエンジン
用燃料噴射管１をコモンレールに適用した接続構造例を
図９に基づいて説明する。すなわち、図９に示す接続構
造は円形パイプ状からなる本管レール６側の軸方向の周
壁部に間隔を置いて設けた複数個のボス部６−４に、本
管レール６の流通路６−１に通じかつ外方に開口する受
圧座面６−３を有する分岐孔６−２が穿設され、図１に
示すディーゼルエンジン用燃料噴射管１の接続頭部２の
なすシート面（押圧座面）２−１ａを本管レール６側の
受圧座面６−３に当接係合せしめ、予め燃料噴射管側に
スリーブワッシャ５を介して組込んだ締付け用ナット４
を前記ボス部６−４に螺合することにより前記接続頭部
２首下での押圧に伴って締着して接続構成する方式とな
っている。Next, an example of a connection structure in which the fuel injection pipe 1 for a diesel engine shown in FIG. 1 is applied to a common rail will be described with reference to FIG. In other words, the connection structure shown in FIG. 9 has a plurality of bosses 6-4 provided at intervals on the axial peripheral wall of the main pipe rail 6 having a circular pipe shape. -1, and a branch hole 6-2 having a pressure receiving seat surface 6-3 which is open outward, is formed, and a seat surface (pressing) formed by a connection head 2 of the fuel injection pipe 1 for a diesel engine shown in FIG. The seat nut 2-1a is brought into contact with the pressure receiving seat surface 6-3 on the main pipe rail 6 side, and the fastening nut 4 previously assembled via the sleeve washer 5 on the fuel injection pipe side.
Is screwed into the boss portion 6-4 so as to be fastened together with the pressure below the neck of the connection head 2 to form a connection structure.
【００１８】また、前記図２に示すディーゼルエンジン
用燃料噴射管１をＰ−Ｌ−Ｄ噴射システムに用いた接続
構造例を図１０に基づいて説明する。すなわち、図１０
に示す接続構造はポンプボディー７の軸方向の周壁部に
設けたボス部７−４に、ポンプボディー７の内部に通
じ、かつ外方に開口する受圧座面７−３を有する分岐孔
７−２を穿設され、図２に示すディーゼルエンジン用燃
料噴射管１の接続頭部２のなすシート面（押圧座面）２
−１ａとオリフィス管３ｂのフランジ３ｂ−１に形成し
たシート面（押圧座面）３ｂ−２をポンプボディー７側
の受圧座面７−３に当接係合せしめ、予め燃料噴射管側
にスリーブワッシャ５を介して組込んだ締付け用ナット
４を前記ボス部７−４に螺合することにより前記接続頭
部２首下での押圧に伴って締着して接続構成する方式と
なっている。前記オリフィス管３ｂの場合は、締付け用
ナット４を締付けて燃料噴射管１をポンプボディー７に
締着して接続した際に、該オリフィス管３ｂのフランジ
３ｂ−２の端部もポンプボディー７側の受圧座面７−３
に当接係合するように当該フランジ３ｂ−２の端部周面
に受圧座面７−３に当接するシート面３ｂ−２を形成し
て構成しているので、締付け用ナット４の締付けに伴い
オリフィス管３ｂは接続頭部２と受圧座面７−３との間
で締付けられ、より堅固に固定される。An example of a connection structure in which the diesel engine fuel injection pipe 1 shown in FIG. 2 is used in a PLD injection system will be described with reference to FIG. That is, FIG.
Is connected to a boss 7-4 provided on the peripheral wall of the pump body 7 in the axial direction, and has a branch hole 7-3 having a pressure receiving seat surface 7-3 communicating with the inside of the pump body 7 and opening outward. 2, a seat surface (press seat surface) 2 formed by a connection head 2 of the fuel injection pipe 1 for a diesel engine shown in FIG.
-1a and the seat surface (pressing seat surface) 3b-2 formed on the flange 3b-1 of the orifice tube 3b are brought into contact with the pressure receiving seat surface 7-3 on the pump body 7 side, and a sleeve is previously provided on the fuel injection tube side. The fastening nut 4 incorporated via the washer 5 is screwed into the boss portion 7-4 so as to be fastened and connected by pressing under the connection head 2 neck. . In the case of the orifice pipe 3b, when the fuel injection pipe 1 is tightened and connected to the pump body 7 by tightening the tightening nut 4, the end of the flange 3b-2 of the orifice pipe 3b is also connected to the pump body 7 side. Pressure receiving surface 7-3
Is formed on the peripheral surface of the end of the flange 3b-2 so as to abut against the pressure receiving seat surface 7-3, so that the fastening nut 4 can be tightened. Accordingly, the orifice tube 3b is tightened between the connection head 2 and the pressure receiving seat surface 7-3, and is fixed more firmly.
【００１９】また、前記図７に示すディーゼルエンジン
用燃料噴射管１をコモンレールに適用した接続構造例を
図１１に基づいて説明する。すなわち、前記図９に示す
接続構造と同様、円形パイプ状からなる本管レール８側
の軸方向の周壁部に間隔を置いて設けた複数個のボス部
８−４に、本管レール８の流通路８−１に通じかつ外方
に開口する受圧座面８−３を有する分岐孔８−２が穿設
され、図７に示すディーゼルエンジン用燃料噴射管１の
接続頭部２のなすシート面（押圧座面）２−１ａを本管
レール８側の受圧座面８−３に当接係合せしめ、予め燃
料噴射管側にスリーブワッシャ５を介して組込んだ締付
け用ナット４を前記ボス部８−４に螺合することにより
前記接続頭部２首下での押圧に伴って締着して接続構成
する方式となっている。前記オリフィス管３ｆの場合
は、締付け用ナット４を締付けて燃料噴射管１を本管レ
ール８側のボス部８−４に締着して接続した際に、該オ
リフィス管３ｆの厚肉のリング３ｆ−２の端部も本管レ
ール８側の受圧座面８−３に当接係合するように当該リ
ング３ｆ−２の端部周面が受圧座面８−３に当接してシ
ート面を形成して構成しているので、締付け用ナット４
の締付けに伴いオリフィス管３ｆは接続頭部２と受圧座
面８−３との間で締付けられ、より堅固に固定されるの
みならず、リング３ｆ−２が軟質金属製であるのでシー
ル性も極めて良好となる。また、当該リング３ｆ−２は
硬質金属製の管体３ｆ−１からなるため、接続頭部成形
時に縮径することもなく、管路１−３に強固に取付けが
可能である。An example of a connection structure in which the fuel injection pipe 1 for a diesel engine shown in FIG. 7 is applied to a common rail will be described with reference to FIG. That is, similarly to the connection structure shown in FIG. 9, a plurality of boss portions 8-4 provided at intervals on an axial peripheral wall portion on the side of the main pipe rail 8 formed of a circular pipe are attached to the main pipe rail 8. A branch hole 8-2 having a pressure receiving seat surface 8-3 communicating with the flow passage 8-1 and opening outward is formed, and a seat formed by the connection head 2 of the fuel injection pipe 1 for a diesel engine shown in FIG. The surface (pressing seating surface) 2-1a is brought into contact with the pressure receiving seating surface 8-3 on the main pipe rail 8 side, and the tightening nut 4 previously assembled via the sleeve washer 5 on the fuel injection pipe side is used. By screwing into the boss portion 8-4, a connection structure is formed by tightening with the pressing under the neck of the connection head 2. In the case of the orifice pipe 3f, when the fuel injection pipe 1 is fastened to the boss portion 8-4 on the main pipe rail 8 side by tightening the fastening nut 4, the thick ring of the orifice pipe 3f is used. The peripheral surface of the end of the ring 3f-2 abuts against the pressure receiving seat surface 8-3 so that the end of the ring 3f-2 also abuts and engages with the pressure receiving seat surface 8-3 on the main pipe rail 8 side. , So that the tightening nut 4
The orifice tube 3f is tightened between the connection head 2 and the pressure receiving seat surface 8-3 with the tightening, and not only is more firmly fixed, but also the sealability is improved because the ring 3f-2 is made of soft metal. Very good. In addition, since the ring 3f-2 is formed of the hard metal tube 3f-1, the ring 3f-2 can be firmly attached to the pipe line 1-3 without being reduced in diameter at the time of forming the connection head.
【００２０】また、前記図８に示すディーゼルエンジン
用燃料噴射管１をコモンレールに適用した接続構造例を
図１２に基づいて説明する。すなわち、前記図１１に示
す接続構造と同様、円形パイプ状からなる本管レール９
側の軸方向の周壁部に間隔を置いて設けた複数個のボス
部９−４に、本管レール９の流通路９−１に通じかつ外
方に開口する受圧座面９−３を有する分岐孔９−２が穿
設され、図８に示すディーゼルエンジン用燃料噴射管１
の接続頭部２のなすシート面（押圧座面）２−１ａを本
管レール９側の受圧座面９−３に当接係合せしめ、予め
燃料噴射管側にスリーブワッシャ５を介して組込んだ締
付け用ナット４を前記ボス部９−４に螺合することによ
り前記接続頭部２首下での押圧に伴って締着して接続構
成する方式となっている。前記オリフィス管３ｇの場合
も前記図１１に示すものと同様、締付け用ナット４を締
付けて燃料噴射管１を本管レール９側のボス部９−４に
締着して接続した際に、該オリフィス管３ｇの厚肉の外
管３ｇ−２のフランジ部３ｇ−２′も本管レール９側の
受圧座面９−３に当接係合するように当該フランジ部３
ｇ−２′の端部周面が受圧座面９−３に当接してシート
面を形成して構成しているので、締付け用ナット４の締
付けに伴いオリフィス管３ｇは接続頭部２と受圧座面９
−３との間で締付けられ、より堅固に固定されるのみな
らず、外管３ｇ−２が軟質金属製であるのでシール性も
極めて良好となる。また、当該オリフィス管３ｇの内管
３ｇ−１も硬質金属製であるため、管路１−３に強固に
取付けが可能である。An example of a connection structure in which the fuel injection pipe 1 for a diesel engine shown in FIG. 8 is applied to a common rail will be described with reference to FIG. That is, similar to the connection structure shown in FIG.
A plurality of boss portions 9-4 provided at intervals on the peripheral wall portion in the axial direction have a pressure receiving seat surface 9-3 communicating with the flow passage 9-1 of the main rail 9 and opening outward. The fuel injection pipe 1 for a diesel engine shown in FIG.
The seat surface (pressing seat surface) 2-1a formed by the connecting head 2 of FIG. 1 is brought into contact with the pressure receiving seat surface 9-3 of the main pipe rail 9 side, and is previously assembled to the fuel injection pipe side via the sleeve washer 5. By screwing the tightened nut 4 into the boss 9-4, a connection is made by tightening with the pressing under the connection head 2 neck. In the case of the orifice pipe 3g, similarly to the one shown in FIG. 11, when the tightening nut 4 is tightened and the fuel injection pipe 1 is fastened to the boss 9-4 on the main pipe rail 9 side and connected. The flange portion 3g-2 'of the thick outer tube 3g-2 of the orifice tube 3g also comes into contact with the pressure receiving seat surface 9-3 on the main pipe rail 9 side so as to abut.
Since the end peripheral surface of g-2 'is configured to abut the pressure receiving seat surface 9-3 to form a seat surface, the orifice tube 3g is connected to the connection head 2 and the pressure receiving surface with the tightening of the tightening nut 4. Seat 9
In addition to being tightly fixed between -3 and -3, the outer tube 3g-2 is made of a soft metal, so that the sealing property is extremely good. Further, since the inner tube 3g-1 of the orifice tube 3g is also made of hard metal, it can be firmly attached to the conduit 1-3.
【００２１】なお、前記図９、図１１、図１２に示す接
続構造例におけるコモンレールとしての本管レール６、
８、９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Ｓ４５Ｃなどの鍛造品
であって、ボーリング、ガンドリルなどの機械加工によ
ってその軸芯内部を流通路となして、軸方向の周壁部に
間隔を保持して複数個の一体型ボス部または別体型ボス
部、ブロック・レール型の場合は接続孔部がそれぞれ設
けられている。また、一体型ボス部を有するコモンレー
ルとしては上記の接続構造に限定されるものではなく、
図示しないが流通路に通ずる分岐孔をボス部の自由端部
付近まで延長せしめ、受圧座面を前記ボス部の自由端部
に露出するよう形成せしめ、当該ボス部の内周に雌ねじ
を加工してナットを前記雌ねじに螺合することにより燃
料噴射管の接続頭部首下での押圧に伴って締着して接続
構成する方式のものなどにも適用できることはいうまで
もない。The main rail 6 as a common rail in the connection structure examples shown in FIGS.
Reference numerals 8 and 9 denote forgings made of, for example, material S45C having a relatively thick tubular portion having a diameter of 28 mm and a wall thickness of 9 mm, and flow inside the shaft core by machining such as boring and gun drilling. Accordingly, a plurality of integral bosses or separate bosses are provided on the peripheral wall in the axial direction with a space therebetween, and connection holes are provided in the case of the block rail type. Further, the common rail having the integrated boss is not limited to the above connection structure,
Although not shown, a branch hole communicating with the flow passage is extended to near the free end of the boss, the pressure receiving seat surface is formed to be exposed at the free end of the boss, and a female screw is formed on the inner periphery of the boss. Needless to say, the present invention can also be applied to a system in which a nut is screwed into the female screw to fasten and connect the fuel injection pipe in accordance with pressing under the connection head neck of the fuel injection pipe.
【００２２】[0022]
【発明の効果】以上説明したごとく、本発明に係るディ
ーゼルエンジン用燃料噴射管は、接続頭部の先端開口部
にオリフィス管を内嵌固着して構成したことにより、こ
のオリフィス管がオリフィスの役目のみをしてシール性
に影響を与えないためシールの安定性が高く、また脈動
を低く抑えかつ伝播を遅くかつ小さくして安定した燃料
の噴射を行うことができるという優れた効果を奏する。As described above, the fuel injection pipe for a diesel engine according to the present invention is configured such that the orifice pipe is fitted and fixed in the opening at the tip of the connection head, so that the orifice pipe functions as an orifice. Since the sealing performance is not affected and the sealing performance is not affected, there is an excellent effect that the stability of the seal is high, the pulsation is suppressed low, the propagation is slow and small, and the stable fuel injection can be performed.
【図１】本発明のディーゼルエンジン用燃料噴射管の第
１実施態様を示す縦断面図である。FIG. 1 is a longitudinal sectional view showing a first embodiment of a fuel injection pipe for a diesel engine of the present invention.
【図２】同じく本発明の第２実施態様を示す縦断面図で
ある。FIG. 2 is a longitudinal sectional view showing a second embodiment of the present invention.
【図３】同じく本発明の第３実施態様を示す図で、オリ
フィス管を接続頭部の端面とほぼ面一に設けた例を示す
縦断面図である。FIG. 3 is a view showing a third embodiment of the present invention, and is a longitudinal sectional view showing an example in which an orifice tube is provided substantially flush with an end face of a connection head.
【図４】同じく本発明の第３実施態様を示す図で、オリ
フィス管の一部を接続頭部の端面より突出させて固定し
た例を示す縦断面図である。FIG. 4 is a view showing the third embodiment of the present invention, and is a longitudinal sectional view showing an example in which a part of an orifice tube is projected from an end face of a connection head and fixed.
【図５】同じく本発明の第４実施態様を示す縦断面図で
ある。FIG. 5 is a longitudinal sectional view showing a fourth embodiment of the present invention.
【図６】同じく本発明の第５実施態様を示す縦断面図で
ある。FIG. 6 is a longitudinal sectional view showing a fifth embodiment of the present invention.
【図７】同じく本発明の第６実施態様を示す縦断面図で
ある。FIG. 7 is a longitudinal sectional view showing a sixth embodiment of the present invention.
【図８】同じく本発明の第７実施態様を示す縦断面図で
ある。FIG. 8 is a longitudinal sectional view showing a seventh embodiment of the present invention.
【図９】図１に示すディーゼルエンジン用燃料噴射管を
コモンレールに適用した接続構造例を示す縦断面図であ
る。9 is a longitudinal sectional view showing a connection structure example in which the diesel engine fuel injection pipe shown in FIG. 1 is applied to a common rail.
【図１０】図２に示すディーゼルエンジン用燃料噴射管
をＰ−Ｌ−Ｄ噴射システムに適用した接続構造例を示す
縦断面図である。10 is a longitudinal sectional view showing a connection structure example in which the diesel engine fuel injection pipe shown in FIG. 2 is applied to a PLD injection system.
【図１１】図７に示すディーゼルエンジン用燃料噴射管
をコモンレールに適用した接続構造例を示す縦断面図で
ある。11 is a longitudinal sectional view showing a connection structure example in which the diesel engine fuel injection pipe shown in FIG. 7 is applied to a common rail.
【図１２】図８に示すディーゼルエンジン用燃料噴射管
をコモンレールに適用した接続構造例を示す縦断面図で
ある。12 is a longitudinal sectional view showing a connection structure example in which the diesel engine fuel injection pipe shown in FIG. 8 is applied to a common rail.
【図１３】本発明の対象とする従来のコモンレールの燃
料噴射管接続構造部の一例を示す縦断面図である。FIG. 13 is a longitudinal sectional view showing an example of a fuel injection pipe connection structure of a conventional common rail to which the present invention is applied.
【図１４】同上のコモンレールの燃料噴射管接続構造に
おける圧力変動抑制手段の一例を示す縦断面図である。FIG. 14 is a longitudinal sectional view showing an example of a pressure fluctuation suppressing means in the fuel injection pipe connection structure of the common rail in the above.
１ 燃料噴射管 ２ 接続頭部 ３ａ、３ｂ、３ｃ、３ｄ、３ｅ、３ｆ、３ｇ オリフィ
ス管 ４ 締付け用ナット ５ スリーブワッシャ ６、８、９ 本管レール ６−１、８−１、９−１ 流通路 ６−２、７−２、８−２、９−２ 分岐孔 ６−３、７−３、８−３、９−３ 受圧座面 ６−４、７−４、８−４、９−４ ボス部 ７ ポンプボディーDESCRIPTION OF SYMBOLS 1 Fuel injection pipe 2 Connection head 3a, 3b, 3c, 3d, 3e, 3f, 3g Orifice pipe 4 Tightening nut 5 Sleeve washer 6, 8, 9 Main rail 6-1, 8-1, 9-1 Distribution Road 6-2, 7-2, 8-2, 9-2 Branch hole 6-3, 7-3, 8-3, 9-3 Pressure receiving seat surface 6-4, 7-4, 8-4, 9- 4 Boss part 7 Pump body
Claims (6)
部と締付けナットを有するディーゼルエンジン用燃料噴
射管において、少なくとも片側の管端部付近の管内に管
路径より小径もしくは同一径の外径を有するオリフィス
管を管端もしくは管端付近の内部に設けて構成したこと
を特徴とするディーゼルエンジン用燃料噴射管。1. A fuel injection pipe for a diesel engine having a head having a conical or spherical seat surface and a tightening nut, wherein at least one of the pipes near the pipe end has an outer diameter smaller than or equal to the pipe diameter. A fuel injection pipe for a diesel engine, wherein an orifice pipe is provided at or near a pipe end.
管内部に固定されていることを特徴とする請求項１記載
のディーゼルエンジン用燃料噴射管。2. The fuel injection pipe for a diesel engine according to claim 1, wherein the orifice pipe is fixed inside the pipe by an external diameter reducing force.
出した突出部を有していることを特徴とする請求項１ま
たは請求項２記載のディーゼルエンジン用燃料噴射管。3. The fuel injection pipe for a diesel engine according to claim 1, wherein the orifice pipe has a protruding part whose one end protrudes outside from the pipe end.
有していることを特徴とする請求項３記載のディーゼル
エンジン用燃料噴射管。4. The fuel injection pipe for a diesel engine according to claim 3, wherein the projection has a flange part having a diameter larger than a pipe diameter.
管端より外部に突出した当該管体の一端に外嵌した軟質
金属製のリングとからなることを特徴とする請求項１ま
たは請求項２記載のディーゼルエンジン用燃料噴射管。5. The orifice tube comprises: a hard metal tube;
3. A fuel injection pipe for a diesel engine according to claim 1, comprising a soft metal ring externally fitted to one end of the pipe body protruding outside from the pipe end.
管端より外部に突出したフランジ部を有する軟質金属製
の外管とからなることを特徴とする請求項１または請求
項２記載のディーゼルエンジン用燃料噴射管。6. The orifice tube includes a hard metal inner tube,
The fuel injection pipe for a diesel engine according to claim 1 or 2, comprising an outer pipe made of a soft metal having a flange portion protruding outside from the pipe end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000344055A JP4509357B2 (en) | 1999-12-09 | 2000-11-10 | Fuel injection pipe for diesel engine |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35030099 | 1999-12-09 | ||
| JP11-350300 | 1999-12-09 | ||
| JP2000344055A JP4509357B2 (en) | 1999-12-09 | 2000-11-10 | Fuel injection pipe for diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001227431A true JP2001227431A (en) | 2001-08-24 |
| JP4509357B2 JP4509357B2 (en) | 2010-07-21 |
Family
ID=26579170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000344055A Expired - Fee Related JP4509357B2 (en) | 1999-12-09 | 2000-11-10 | Fuel injection pipe for diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4509357B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007309232A (en) * | 2006-05-18 | 2007-11-29 | Usui Kokusai Sangyo Kaisha Ltd | High pressure fuel injection pipe including connecting head part and method for manufacturing same |
| JPWO2010119896A1 (en) * | 2009-04-15 | 2012-10-22 | 臼井国際産業株式会社 | Fuel injection pipe for diesel engine |
| WO2021131537A1 (en) * | 2019-12-25 | 2021-07-01 | 三桜工業株式会社 | Fuel piping, fuel piping connecting structure, and method for manufacturing fuel piping |
| WO2022230743A1 (en) * | 2021-04-30 | 2022-11-03 | 臼井国際産業株式会社 | Fuel rail |
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| WO2022230743A1 (en) * | 2021-04-30 | 2022-11-03 | 臼井国際産業株式会社 | Fuel rail |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4509357B2 (en) | 2010-07-21 |
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