JP4305710B2 - Fuel distribution pipe - Google Patents

Fuel distribution pipe Download PDF

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Publication number
JP4305710B2
JP4305710B2 JP2000290611A JP2000290611A JP4305710B2 JP 4305710 B2 JP4305710 B2 JP 4305710B2 JP 2000290611 A JP2000290611 A JP 2000290611A JP 2000290611 A JP2000290611 A JP 2000290611A JP 4305710 B2 JP4305710 B2 JP 4305710B2
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JP
Japan
Prior art keywords
distribution pipe
fuel
fuel distribution
lower half
flange
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2000290611A
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Japanese (ja)
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JP2002098023A (en
Inventor
俊之 横井
正人 中根
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aisin Corp
Original Assignee
Aisin Seiki Co Ltd
Aisin Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aisin Seiki Co Ltd, Aisin Corp filed Critical Aisin Seiki Co Ltd
Priority to JP2000290611A priority Critical patent/JP4305710B2/en
Publication of JP2002098023A publication Critical patent/JP2002098023A/en
Application granted granted Critical
Publication of JP4305710B2 publication Critical patent/JP4305710B2/en
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Expired - Fee Related legal-status Critical Current

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Description

【0001】
【発明の属する技術分野】
本発明は、内燃機関の各気筒のインジェクタに燃料を分配するための燃料分配管(フューエルデリバリパイプ)に関し、特に詳述すれば、上下に分割成形し、取付ボスを有する上半体とインジェクタ挿入口を有する下半体を溶着して一体とした燃料分配管に関する。
【0002】
【従来の技術】
燃料分配管の代表的な構成が特開平9−203361号公報に開示され、又、その成形手段の一例が特開平8−284779号公報に開示される。該従来例を図4乃至6に示す。
【0003】
燃料分配管1は、内部に燃料通路と一方の端に入口を有する円筒状の本体2と、少なくとも一対の支持部材3と、インジェクタへの挿入口4を有する複数個の挿入部材5とを、合成樹脂材を用い射出成形して一体に構成している。
本体2中の燃料通路とインジェクタ挿入口4とは、図5に示すように通路用中子6と挿入口用中子7とを全型8内に配して成形する。挿入口用中子7の先端面は通路用中子6の座ぐり面に突き当て両中子6,7の相対的位置関係を確保している。
【0004】
【発明が解決しようとする課題】
図6に示すように、通路用中子6の座ぐり面と挿入口用中子7の先端面との突き当たりは、合成樹脂材の射出成形時、その突き当たり部にバリを作り、両中子6,7の除去後、燃料通路に開口する挿入口の周縁にバリを残し、これを成形後外部からバリ取りできないことから、このバリが燃料内に混入する危険がある。
【0005】
加えて、図5に示すように通路用中子6を用いることから、燃料分配管の曲線化が不可能でその設計の自由度が制約されている。さらに、本体2には、比較的長いブラケット状の支持部材3、および気筒数に応じたインジェクタ挿入口4を有する挿入部材5を本体2と非対称形に一体に成形していることから、燃料分配管1に反りの問題が生じ、その反りの対策に苦慮している。
燃料分配管1の反りは、挿入口4のピッチを変え、気筒のインジェクタへの挿入作業を難しくしている。
【0006】
それ故に、本発明は、前述した従来技術の不具合を解消させることを解決すべき課題とする。
【0007】
【課題を解決するための手段】
本発明は、前述した課題を解決するために、燃料分配管の本体を上下に2分割した形で成形し、上半体に支持部材としての取付ボスを、下半体に複数個のインジェクタ挿入口を配し、両半体の縁を溶着させる技術的手段を採用する。
【0008】
このような基本的な技術的手段の採用は、インジェクタ挿入口のピッチを、寸法精度を必要としない取付ボスと寸法精度を必要とするインジェクタ挿入口を有する部材を分けたので、正確に保つことができる。
さらに、両半体の側縁を燃料通路と分離させているので、両半体の側縁の溶着時バリが出ても燃料通路にバリが入ることはない。
【0009】
本体を上下別々に成形しているから、曲線化が可能となり、設計の自由度が増すので搭載性を向上させ得るし、又、必要に応じて、燃料通路内にじゃま板を配置させ得る。
【0010】
本発明によれば、少なくとも2個の離間した取付ボスを有する上半体と、側壁部と底壁部とからなりインジェクタの挿入口を有する下半体とを備え、上半体と下半体とにより画定される燃料通路を作る壁部とは離間した位置で上半体と下半体とが溶着されて一体に構成される燃料分配管において、上半体はフランジを有し、下半体はフランジに溶着される溶着用片を有し、フランジと溶着用片との間に燃料通路と隔離された空間が形成される燃料分配管が提供される。
【0011】
【発明の実施の形態】
図1乃至3に示すように燃料分配管10は長手方向に延在する中空本体11、シリンダヘッド等へボルト止めされる筒状の取付ボス12、および内燃機関の各気筒のインジェクタへの挿入口13を有し、中空本体11内の燃料通路14には燃料の圧力変動(脈動)を低減するダンパとしてのじゃま板15を適宜配す。
【0012】
合成樹脂製の中空本体11は、上半体16と、下半体17とからなり両半体16,17を溶着することで一体構成とさせる。
上半体16は、基板18とその両側の断面L字状のフランジ19,19とよりなり、一方のフランジ19より側外に少なくとも2個の離間した取付ボス12を備える構成である。フランジ19,19の肉厚は基板18の肉厚と同等又は若干薄肉としてもよい。
下半体17は、対向する側壁部20,20と、底壁部21とからなる断面略U字状のもので、その側壁部20,20の適所に側外へと延在する溶着用片22,22を設ける。
【0013】
インジェクタへの挿入口13は、下半体17の燃料通路14内へと延出する中空体23により画定される。中空体23は底壁部21と一体に成形される。
中空体23により画定される挿入口13はインジェクタの数と同じ数だけ、インジェクタのピッチと同ピッチで下半体17に形成される。
じゃま板15は、好ましくは上半体16の基板18と一体に設けるが、下半体17に設けても良く、その形状は、特に限定されることなく、燃料の脈動を阻止又は低減させ得るものであればよい。
本実施形態において、じゃま板15は燃料通路14内に突出し、その通路面積を縮小するように構成している。これにより、燃料通路14内の燃料の流れは阻止しないが、圧力の伝達は阻止する所謂オリフィス効果を効する。また、底壁部21とじゃま板15を当接させるように配置すれば、中空本体の捻り剛性を向上させ、取付時の変形を防止しうる。
【0014】
上半体16と下半体17とを図3に示すように突き合せし、下半体17の対向側壁部20,20の開口縁端面を上半体16の基板18の内壁面に当接させる。
この状態で、空間24,24を介してフランジ19,19が溶着片22,22に密着する。この密着部を振動等を用いて溶着させ、上半体16と下半体17とを一体とさせる。
空間24,24は溶着片22,22とフランジ19,19との溶着により、仮りにバリが生じても、このバリを受け、燃料通路14内へバリが進入しないようにする。下半体17の対向側壁部20,20の開口縁端面と上半体16の基板18の内壁面との当接はバリの燃料通路14内への進入を確実に阻止する。
【0015】
取付ボス12の形状は、図3に示される形状に限定されることなく、気筒の形状に適応する形状のものとする。取付ボス12間のピッチはインジェクタ挿入口13のピッチに比し、その寸法精度は低くてもよい。このため、上半体16に寸法精度の必要のないものを配し、寸法精度の必要なものを下半体17に配す。分配管10の加工は常用手段で容易にできる。
上半体16と下半体17とを個々に成形し、これを一体に溶着させることにより、燃料通路の曲線化が可能となり、周辺部品との干渉を避け、搭載性を向上させ得る。
【図面の簡単な説明】
【図1】本発明の一例の燃料分配管の平面図である。
【図2】図1の矢視II−IIよりみた断面図である。
【図3】図1の矢視 III−III よりみた断面図である。
【図4】従来例の燃料分配管を示す斜視図である。
【図5】金型内の中子の配置を示す横断面図である。
【図6】成形後バリの発生する部分を示す断面図である。
【符号の説明】
10 燃料分配管
11 本体
12 取付ボス
13 インジェクタ挿入口
14 燃料通路
15 じゃま板
16 上半体
17 下半体
18 基板
19 フランジ
20 対向側壁部
21 底壁部
22 溶着片
23 中空体
24 空間(バリだめ)
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fuel distribution pipe (fuel delivery pipe) for distributing fuel to injectors of each cylinder of an internal combustion engine. More specifically, the present invention relates to an upper half body which is divided into upper and lower parts and has a mounting boss and an injector insertion. The present invention relates to a fuel distribution pipe integrated by welding a lower half body having a mouth.
[0002]
[Prior art]
A typical configuration of the fuel distribution pipe is disclosed in Japanese Patent Application Laid-Open No. 9-203361, and an example of the forming means is disclosed in Japanese Patent Application Laid-Open No. 8-284797. The conventional example is shown in FIGS.
[0003]
The fuel distribution pipe 1 includes a cylindrical main body 2 having a fuel passage inside and an inlet at one end, at least a pair of support members 3, and a plurality of insertion members 5 having insertion ports 4 for injectors. It is integrally formed by injection molding using a synthetic resin material.
The fuel passage in the main body 2 and the injector insertion port 4 are formed by arranging the passage core 6 and the insertion port core 7 in the entire mold 8 as shown in FIG. The distal end surface of the insertion port core 7 abuts against the counterbore surface of the passage core 6 to secure the relative positional relationship between the cores 6 and 7.
[0004]
[Problems to be solved by the invention]
As shown in FIG. 6, the abutting between the counterbore surface of the passage core 6 and the distal end surface of the insertion port core 7 is a burr formed at the abutting portion during the injection molding of the synthetic resin material. After removing 6 and 7, burrs are left on the periphery of the insertion opening that opens in the fuel passage, and since this cannot be deburred from the outside after molding, there is a risk that the burrs will be mixed into the fuel.
[0005]
In addition, since the passage core 6 is used as shown in FIG. 5, the fuel distribution pipe cannot be curved, and the degree of design freedom is limited. Further, since the main body 2 has a relatively long bracket-like support member 3 and an insertion member 5 having an injector insertion port 4 corresponding to the number of cylinders integrally formed with the main body 2 in an asymmetric shape, The piping 1 has a problem of warping, and it is difficult to take measures against the warping.
The warp of the fuel distribution pipe 1 changes the pitch of the insertion ports 4 and makes it difficult to insert the cylinder into the injector.
[0006]
Therefore, this invention makes it the subject which should be solved to eliminate the malfunction of the prior art mentioned above.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention forms the fuel distribution pipe body into two vertically divided parts, and inserts a mounting boss as a support member in the upper half and a plurality of injectors in the lower half. Adopt technical means to arrange the mouth and weld the edges of both halves.
[0008]
The adoption of such basic technical means keeps the pitch of the injector insertion ports accurate because the mounting boss that does not require dimensional accuracy and the member that has the injector insertion ports that require dimensional accuracy are separated. Can do.
Further, since the side edges of both halves are separated from the fuel passage, no burrs enter the fuel passage even if burrs appear at the side edges of both halves.
[0009]
Since the main body is formed separately on the upper and lower sides, it is possible to make a curve, and the degree of freedom of design increases, so that the mountability can be improved, and a baffle plate can be arranged in the fuel passage as necessary.
[0010]
According to the present invention, an upper half body having at least two spaced mounting bosses, and a lower half body having a side wall portion and a bottom wall portion and having an insertion port for an injector, the upper half body and the lower half body are provided. In the fuel distribution pipe constructed integrally by welding the upper half and the lower half at a position separated from the wall portion that defines the fuel passage defined by the upper half, the upper half has a flange, and the lower half The body has a welding piece welded to the flange, and a fuel distribution pipe is provided in which a space isolated from the fuel passage is formed between the flange and the welding piece .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIGS. 1 to 3, a fuel distribution pipe 10 includes a hollow main body 11 extending in a longitudinal direction, a cylindrical mounting boss 12 bolted to a cylinder head or the like, and an insertion port to an injector of each cylinder of an internal combustion engine. 13, and a baffle plate 15 as a damper for reducing a pressure fluctuation (pulsation) of the fuel is appropriately disposed in the fuel passage 14 in the hollow body 11.
[0012]
The hollow body 11 made of synthetic resin is composed of an upper half 16 and a lower half 17, and the two halves 16, 17 are welded to form an integral structure.
The upper half 16 includes a substrate 18 and flanges 19 and 19 having L-shaped cross sections on both sides thereof, and includes at least two mounting bosses 12 that are spaced apart from one flange 19 on the outer side. The thickness of the flanges 19 and 19 may be equal to or slightly thinner than the thickness of the substrate 18.
The lower half body 17 has a substantially U-shaped cross section composed of opposing side wall portions 20 and 20 and a bottom wall portion 21, and is a piece to be welded that extends outward from the side of the side wall portions 20 and 20. 22 and 22 are provided.
[0013]
The injector inlet 13 is defined by a hollow body 23 that extends into the fuel passage 14 of the lower half 17. The hollow body 23 is formed integrally with the bottom wall portion 21.
The insertion ports 13 defined by the hollow body 23 are formed in the lower half 17 by the same number as the number of injectors and the pitch of the injectors.
The baffle plate 15 is preferably provided integrally with the substrate 18 of the upper half 16, but may be provided on the lower half 17, and its shape is not particularly limited, and can prevent or reduce fuel pulsation. Anything is acceptable.
In the present embodiment, the baffle plate 15 protrudes into the fuel passage 14 and is configured to reduce the passage area. As a result, the so-called orifice effect that prevents the flow of fuel in the fuel passage 14 but prevents the transmission of pressure is effective. Moreover, if it arrange | positions so that the bottom wall part 21 and the baffle plate 15 may contact | abut, the torsional rigidity of a hollow main body can be improved and the deformation | transformation at the time of attachment can be prevented.
[0014]
The upper half 16 and the lower half 17 are abutted as shown in FIG. 3, and the opening edge end surfaces of the opposing side wall portions 20, 20 of the lower half 17 are brought into contact with the inner wall surface of the substrate 18 of the upper half 16. Let
In this state, the flanges 19 and 19 are in close contact with the welding pieces 22 and 22 through the spaces 24 and 24. The close contact portion is welded using vibration or the like, and the upper half body 16 and the lower half body 17 are integrated.
Even if burrs are generated in the spaces 24 and 24 by welding between the welding pieces 22 and 22 and the flanges 19 and 19, the burrs are received and prevented from entering the fuel passage 14. The contact between the opening edge of the opposite side wall portions 20 and 20 of the lower half 17 and the inner wall surface of the substrate 18 of the upper half 16 surely prevents the entry of burrs into the fuel passage 14.
[0015]
The shape of the mounting boss 12 is not limited to the shape shown in FIG. The pitch between the mounting bosses 12 may be lower than the pitch of the injector insertion holes 13 and the dimensional accuracy thereof may be low. For this reason, an upper half 16 that does not require dimensional accuracy is disposed, and an upper half that requires dimensional accuracy is disposed on the lower half 17. Processing of the distribution pipe 10 can be easily performed by conventional means.
By individually molding the upper half body 16 and the lower half body 17 and welding them together, it is possible to curve the fuel passage, avoid interference with peripheral parts, and improve mountability.
[Brief description of the drawings]
FIG. 1 is a plan view of a fuel distribution pipe according to an example of the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
3 is a cross-sectional view taken along the line III-III in FIG.
FIG. 4 is a perspective view showing a conventional fuel distribution pipe.
FIG. 5 is a cross-sectional view showing the arrangement of cores in a mold.
FIG. 6 is a cross-sectional view showing a portion where burrs are generated after molding.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Fuel distribution pipe 11 Main body 12 Mounting boss 13 Injector insertion port 14 Fuel passage 15 Baffle plate 16 Upper half body 17 Lower half body 18 Substrate 19 Flange 20 Opposite side wall part 21 Bottom wall part 22 Welding piece 23 Hollow body 24 Space (deburring )

Claims (8)

少なくとも2個の離間した取付ボスを有する上半体と、側壁部と底壁部とからなりインジェクタの挿入口を有する下半体とを備え、上半体と下半体とにより画定される燃料通路を作る壁部とは離間した位置で上半体と下半体とが溶着されて一体に構成される燃料分配管において
上半体はフランジを有し、下半体はフランジに溶着される溶着用片を有し、フランジと溶着用片との間に燃料通路と隔離された空間が形成される燃料分配管
A fuel defined by an upper half and a lower half, the upper half having at least two spaced mounting bosses, and a lower half having a side wall portion and a bottom wall portion and having an insertion port for an injector a fuel distribution pipe formed integrally with the upper half and lower half are welded in spaced position from the wall to make a passageway,
A fuel distribution pipe in which an upper half has a flange, a lower half has a welding piece welded to the flange, and a space isolated from the fuel passage is formed between the flange and the welding piece .
上半体が、長手方向に延在すると共に両側縁にフランジが設けられた基板と、一方のフランジより側外方に設けた取付ボスからなる請求項1記載の燃料分配管。Upper halves, a substrate flange on both side edges is provided with longitudinally extending fuel distribution pipe according to claim 1, wherein comprising a mounting boss provided on the side outward from the hand of the flange. 下半体が側壁部と底壁部とからなる断面略U字状をなし、下半体の側壁部の開口縁が上半体の基板の内壁面に当接する請求項1記載の燃料分配管。Lower halves substantially U-shaped cross-section comprising a side wall and a bottom wall, the fuel of claim 1, wherein an opening edge of the side wall portions of the lower halves that those Sessu the inner wall surface of the substrate upper half Distribution pipe. 空間はフランジと溶着用片と側壁部とで囲まれている請求項1乃至3のいずれか一項に記載の燃料分配管。The fuel distribution pipe according to any one of claims 1 to 3, wherein the space is surrounded by a flange, a welding piece, and a side wall . 下半体の底壁部にインジェクタ挿入口が設けられている請求項4記載の燃料分配管。  The fuel distribution pipe according to claim 4, wherein an injector insertion port is provided in a bottom wall portion of the lower half body. インジェクタ挿入口が下半体の対向側壁部間に位置する円筒体により画定される請求項5記載の燃料分配管。  6. The fuel distribution pipe according to claim 5, wherein the injector insertion port is defined by a cylindrical body located between opposing side wall portions of the lower half body. 燃料通路内にじゃま板が配される請求項1又は6記載の燃料分配管。The fuel distribution pipe according to claim 1 or 6, wherein a baffle plate is arranged in the fuel passage. 上半体と下半体とが合成樹脂材からなる請求項1又は7記載の燃料分配管。The fuel distribution pipe according to claim 1 or 7, wherein the upper half and the lower half are made of a synthetic resin material.
JP2000290611A 2000-09-25 2000-09-25 Fuel distribution pipe Expired - Fee Related JP4305710B2 (en)

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JP4305710B2 true JP4305710B2 (en) 2009-07-29

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Publication number Priority date Publication date Assignee Title
JP5887154B2 (en) * 2011-03-10 2016-03-16 株式会社オティックス Fuel delivery pipe

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53143213U (en) * 1977-04-18 1978-11-11
DE3146889C2 (en) * 1981-11-26 1986-04-30 Bayerische Motoren Werke AG, 8000 München Fuel injection assembly for internal combustion engines
JPS5940577U (en) * 1982-09-03 1984-03-15 トヨタ自動車株式会社 delivery pipe
JPH0754612Y2 (en) * 1989-06-06 1995-12-18 臼井国際産業株式会社 Fuel delivery pipe
JP2929756B2 (en) * 1991-04-30 1999-08-03 株式会社デンソー Accumulation type fuel injection control device
JPH08261099A (en) * 1995-03-24 1996-10-08 Toyoda Gosei Co Ltd Fuel pressure pulsation damper
JPH09112384A (en) * 1995-10-12 1997-04-28 Denso Corp Fuel feeding device
JP2791386B2 (en) * 1995-12-20 1998-08-27 三桜工業株式会社 Delivery pipe for fuel supply system
JP3538798B2 (en) * 1997-06-13 2004-06-14 マルヤス工業株式会社 Fuel delivery
JP2000073909A (en) * 1998-09-02 2000-03-07 Aisan Ind Co Ltd Fuel delivery pipe and manufacture thereof
JP4032537B2 (en) * 1998-11-20 2008-01-16 アイシン精機株式会社 Plastic fuel delivery pipe

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