JPS62153562A - Manufacture of fuel injection valve - Google Patents

Manufacture of fuel injection valve

Info

Publication number
JPS62153562A
JPS62153562A JP29273585A JP29273585A JPS62153562A JP S62153562 A JPS62153562 A JP S62153562A JP 29273585 A JP29273585 A JP 29273585A JP 29273585 A JP29273585 A JP 29273585A JP S62153562 A JPS62153562 A JP S62153562A
Authority
JP
Japan
Prior art keywords
plunger
needle valve
valve
fuel injection
annular groove
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.)
Pending
Application number
JP29273585A
Other languages
Japanese (ja)
Inventor
Kazuhiro Tsuruoka
鶴岡 一広
Naonobu Kanamaru
尚信 金丸
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP29273585A priority Critical patent/JPS62153562A/en
Publication of JPS62153562A publication Critical patent/JPS62153562A/en
Pending legal-status Critical Current

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  • Fuel-Injection Apparatus (AREA)

Abstract

PURPOSE:To make lathe machining for a plunger unnecessary, and besides its relative position to other parts unchangeable by fitting a fittable and cylindri cal plunger on the outer periphery of a needle valve end, and plastically de forming the plunger under pressure to combine the needle valve and the plunger. CONSTITUTION:The needle valve end 93 of a needle valve 9 is fitted in the bore 84 of a plunger 8. A plunger end plane 81 is pressed against a ring-shaped groove 94 to plastically deform, and thereby material for the plunger 8 is made to flow in the ring-shaped groove 94 of the needle valve 9, and engages unitedly with projections in the ring-shaped groove 94 to form a coupling part for transmitting power. Thus, axial lathe machining for the plunger becomes unnecessary, and its relative position to other parts also becomes unchangeable.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は、吸込管噴射装置を有する自然機関の時間的に
制御される低圧噴射装置用の電磁式燃料噴射弁であって
、ケーシング内部に配置された電磁コイル(巻線体)に
よって吸引されるプランジャに固定されたニードル弁が
ノズル本体に設けられた弁座に対して可動することによ
って弁の開閉動作を行ない、燃料の間欠噴射をする燃料
噴射弁に係り、特にプランジャとニードル弁の結合に好
敵な燃料噴射弁の製造方法に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The invention relates to an electromagnetic fuel injection valve for a time-controlled low-pressure injection system of a natural engine with a suction pipe injection system, the valve being arranged inside a casing. A needle valve fixed to a plunger that is attracted by an electromagnetic coil (winding body) moves against a valve seat provided in the nozzle body, opening and closing the valve, and injecting fuel intermittently. The present invention relates to injection valves, and particularly to a method of manufacturing a fuel injection valve that is suitable for coupling a plunger and a needle valve.

〔発明の背景〕[Background of the invention]

従来の燃料噴射弁におけるニードル弁とを結合させる燃
料噴射弁の製造方法は、昭和56年特許出願公告第11
071号公報に開示されているように、環状溝が形成さ
れたニードル弁の結合部にブレスばめを有する接極子(
プランジャ)を嵌合し、該接極子に一体に形成されたプ
レスばめ外径より小さい内径を有する引抜きリングによ
って接極子のプレスばめ部分を同じ径に圧縮せしめるこ
とによって接極子内径を縮小させ、かつ押し出された材
料を部分的にニードル弁の環状構内に侵入させてニード
ル弁と接極子とを圧着して結合させる方法である。
A method for manufacturing a fuel injection valve that combines a conventional fuel injection valve with a needle valve is disclosed in Patent Application Publication No. 11 of 1981.
As disclosed in Japanese Patent Application No. 071, an armature (
The inner diameter of the armature is reduced by fitting the armature (plunger) and compressing the press-fit portion of the armature to the same diameter with a pull-out ring integrally formed with the armature and having an inner diameter smaller than the press-fit outer diameter. In this method, the extruded material partially enters the annular structure of the needle valve, and the needle valve and the armature are crimped and connected.

しかし、このような従来の方法では、接極子(以下、プ
ランジャと称する)に一体に形成されたプレスばめの外
径を圧縮させるため、プランジャ自体が軸方向に伸びて
しまい他部品との相対的位置関係を更に確保しなければ
ならなくなる。したがって、他部品との相対的位置関係
を確保するためには、ニードル弁とプランジャとの結合
後プランジャの軸方向の旋削加工が必要となる。この旋
削加工の際に切削屑がニードル弁とプランジャとの間に
できる空間に侵入する確率が高く、燃料噴射弁において
は致命的な問題となる。
However, in such conventional methods, the outer diameter of the press-fit integrally formed with the armature (hereinafter referred to as the plunger) is compressed, which causes the plunger itself to extend in the axial direction, resulting in It will be necessary to further secure the positional relationship. Therefore, in order to ensure the relative positional relationship with other parts, it is necessary to perform turning in the axial direction of the plunger after the needle valve and the plunger are connected. During this turning process, there is a high probability that cutting debris will enter the space created between the needle valve and the plunger, which poses a fatal problem for fuel injection valves.

〔発明の目的〕[Purpose of the invention]

本発明の目的は、ニードル弁とプランジャとを結合後プ
ランジャの軸方向における旋削加工を不要とし、かつ他
部品との相対的位置関係も変化させることのない燃料噴
射弁の製造方法を提供することにある。
An object of the present invention is to provide a method for manufacturing a fuel injection valve that does not require turning in the axial direction of the plunger after joining the needle valve and the plunger, and does not change the relative positional relationship with other parts. It is in.

〔発明の概要〕[Summary of the invention]

本発明は、吸込管噴射装置を有する寧燃機関の時間的に
制御される低圧噴射装置用の電磁式燃料噴射弁であって
、ケーシング内に配置された電磁コイルによって吸引さ
れるプランジャに固定されたニードル弁がノズル本体に
設けられた弁座に対して可動することにより弁の開閉動
作がなされ、燃料を間欠噴射する燃料噴射弁において、
ニードル弁の一端に形成されたニードル弁端部外周に環
状溝を形成し、該ニードル弁端部外周に嵌合可能な内径
を有する円筒状のプランジャを嵌合し、前記環状溝近傍
のプランジャ端面部の材料を押圧塑性変形させて前記環
状溝内へ流動した材料と前記環状構内の突起とを噛合結
合させるようにしたことを特徴とするものである。
The present invention is an electromagnetic fuel injection valve for a time-controlled low-pressure injection device of a combustion engine having a suction pipe injection device, the valve being fixed to a plunger attracted by an electromagnetic coil arranged in a casing. In a fuel injection valve that intermittently injects fuel, the valve is opened and closed by moving a needle valve with respect to a valve seat provided in a nozzle body.
An annular groove is formed on the outer periphery of the needle valve end formed at one end of the needle valve, a cylindrical plunger having an inner diameter that can be fitted to the outer periphery of the needle valve end is fitted, and the plunger end face near the annular groove is fitted. The material of the annular groove is plastically deformed by pressure so that the material flowing into the annular groove and the protrusion in the annular structure are engaged with each other.

〔発明の実施例〕[Embodiments of the invention]

以下、本発明の実施例を第1図から第3図に基づいて説
明する。
Embodiments of the present invention will be described below with reference to FIGS. 1 to 3.

第1図は、燃料噴射弁の中心軸線による燃料噴射弁の断
面図であり、第2図は、燃料噴射弁におけるニードル弁
とプランジャとの結合部の断面図である。また、第3図
は、燃料噴射弁のニードル弁とプラジャとの結合時の状
態を示す断面図である。
FIG. 1 is a sectional view of the fuel injection valve taken along the central axis of the fuel injection valve, and FIG. 2 is a sectional view of the connecting portion between the needle valve and the plunger in the fuel injection valve. Further, FIG. 3 is a sectional view showing a state in which the needle valve and the plunger of the fuel injection valve are connected.

第1図に示す燃料噴射弁は、銅から成るケーシング2内
に中心孔21を有しており、この中心孔21は磁石の巻
線4を有する巻線体(電磁コイル)3を受容しており、
かつ狭い同軸的な孔22に続いている。さらに巻線体3
内へ挿入された鉄心1が同軸的に延びており、この鉄心
1はフランジ部11にて屈曲縁部12を有するケーシン
グ2内に取り付けられている。鉄心1の端面はプランジ
ャ8に対向しており、このプランジャ8はニードル弁9
と結合されている。ニードル弁9は屈曲縁部13を有す
るケーシング2に固設されたノズル体7内において軸方
向で移動可能に案内されている。
The fuel injection valve shown in FIG. 1 has a center hole 21 in a casing 2 made of copper, and this center hole 21 receives a winding body (electromagnetic coil) 3 having a magnet winding 4. Ori,
and continues into a narrow coaxial hole 22. Furthermore, the winding body 3
A core 1 inserted therein extends coaxially and is mounted at a flange 11 in a casing 2 having a bent edge 12 . The end face of the iron core 1 faces a plunger 8, and this plunger 8 is connected to a needle valve 9.
is combined with The needle valve 9 is guided so as to be axially movable in a nozzle body 7 which is fixedly attached to the housing 2 and has a bent edge 13 .

また、プランジ8は、中央に位置するスプリング6の軸
方向の付勢力をバネ座83により受けておす、その付勢
力はアジャストピン5により調整可能なものとなってい
る。
Further, the plunger 8 receives the axial biasing force of the spring 6 located at the center by a spring seat 83, and the biasing force can be adjusted by the adjustment pin 5.

巻線4が、噴射装置の図示されていない電気制御装置と
接続せしめられ、かつこの電気制御装置から十分大きな
励磁電流が供給されると、ニードル弁9に結合されたプ
ランジャ8が中央に位置するスプリング6の付勢力に抗
して鉄心1に向って移動せしめられ吸引される。
When the winding 4 is connected to an electrical control device (not shown) of the injection device and a sufficiently large excitation current is supplied by this electrical control device, the plunger 8 connected to the needle valve 9 is centered. It is moved toward the iron core 1 against the biasing force of the spring 6 and is attracted.

第2図及び第3図は、ニードル弁9とプランジャ8との
結合及びその結合方法を示す実施例である。
FIGS. 2 and 3 show an embodiment showing the connection between the needle valve 9 and the plunger 8 and the method of connection thereof.

すなわち、ニードル弁9とプランジャ8との結合及びそ
の結合寸法を示す実施例である。
That is, this is an example showing the connection between the needle valve 9 and the plunger 8 and the dimensions of the connection.

すなわち、ニードル弁9とプランジ8とを結合させるた
めにはプランジャ8をガイド101で案内し支持した後
、プランジャ8の内径84にニードル弁9のニードル弁
端部93を嵌合し、ニードル弁端面部95近傍に形成さ
れた1又は2以上の環状溝94に、押圧金型111の突
起部111aにて、環状溝94近傍のプランジャ端面部
81を押圧して押圧して塑性変形させることによって該
プランジャの材料をニードル弁の環状溝内に流動させ、
前記環状溝94内の突起とを噛合結合させて伝力結合部
を得るようにする。
That is, in order to couple the needle valve 9 and the plunger 8, the plunger 8 is guided and supported by the guide 101, and then the needle valve end 93 of the needle valve 9 is fitted into the inner diameter 84 of the plunger 8, and the needle valve end surface is The plunger end surface 81 near the annular groove 94 is pressed by the projection 111a of the press die 111 into one or more annular grooves 94 formed near the annular groove 95, thereby plastically deforming the annular groove 94. flowing the material of the plunger into the annular groove of the needle valve;
The protrusion in the annular groove 94 is engaged with the protrusion to form a power transmitting joint.

本実施例によれば、その結合においてプランジャ8の軸
方向寸法は変化しないため、プランジャの軸方向におけ
る旋削加工は不要であり、旋削加工によって生ずる切削
屑の発生がなく、プランジャ内径とニードル弁端部93
とで作る空間部82内に侵入することがなくなる効果が
ある。
According to this embodiment, since the axial dimension of the plunger 8 does not change during the connection, turning in the axial direction of the plunger is not necessary, and there is no generation of cutting chips caused by turning, and the inner diameter of the plunger and the needle valve end are Part 93
This has the effect of preventing intrusion into the space 82 created by.

第4図には、本発明の他の実施例が示されている。Another embodiment of the invention is shown in FIG.

本実施例には、ニードル弁端部に形成された環状溝の他
の形状のものが示されている。すなち、環状溝内の凹凸
96がローレット加工により形成されたものであって、
本実施例によれば、ニードル弁とプランジャとの結合に
おいて高い回転方向強度を確報することができる。
This embodiment shows other shapes of the annular groove formed at the end of the needle valve. That is, the unevenness 96 in the annular groove is formed by knurling,
According to this embodiment, high strength in the rotational direction can be ensured in the connection between the needle valve and the plunger.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明によれば、ニードル弁とプ
ランジャとを結合した後、プランジャの軸方向の旋削工
程が省略することができるら切削屑の発生もなく、また
、他部品との相対的位置関係も変化することはない。図
面の簡単な説明第1図は本発明の実施例を示す燃料噴射
弁の断面図、第2図は、第1図図示のニードル弁とプラ
ンジャの結合部断面図、第3図は、第1図図示のニード
ル弁とプランジャとの結合時の状態を示す断面図、第4
図は、本発明の他の実施例を示す正面図である。
As explained above, according to the present invention, after the needle valve and the plunger are combined, the process of turning the plunger in the axial direction can be omitted, which eliminates the generation of cutting waste, and also reduces the The positional relationship between the two will not change either. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a fuel injection valve showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of the connection between the needle valve and plunger shown in FIG. 1, and FIG. A sectional view showing a state in which the illustrated needle valve and plunger are connected, No. 4
The figure is a front view showing another embodiment of the invention.

1・・・鉄心、2・・・ケーシング、3・・・巻線体、
4・・・巻線、5・・・アジャストピン、6・・・スプ
リング、7・・・ノズル体、8・・・プランジャ、9・
・・ニードル弁、11・・・フランジ部、21・・・中
心孔、81・・・プランジャ端面図、82・・・空間部
、83・・・バネ座、84・・・内径部、91・・・ニ
ードル弁軸部、92・・・ボール弁、93・・・ニード
ル弁端部、94・・・環状溝、95・・・ニードル弁端
面部、101・・・ガイド、111・・押圧金型、1l
la・・・突起部、96・・・ローレット 1(環状溝
内の凹凸)
1... Iron core, 2... Casing, 3... Winding body,
4... Winding wire, 5... Adjustment pin, 6... Spring, 7... Nozzle body, 8... Plunger, 9...
...Needle valve, 11...Flange part, 21...Center hole, 81...Plunger end view, 82...Space part, 83...Spring seat, 84...Inner diameter part, 91... ... Needle valve stem, 92... Ball valve, 93... Needle valve end, 94... Annular groove, 95... Needle valve end surface, 101... Guide, 111... Pressing metal Mold, 1l
la... protrusion, 96... knurling 1 (irregularities within the annular groove)

Claims (2)

【特許請求の範囲】[Claims] 1.吸込管噴射装置を有する内燃機関の時間的に制御さ
れる低圧噴射装置用の電磁式燃料噴射弁であって、ケー
シング内に配置された電磁コイルによつて吸引れるプラ
ンジヤに固定されたニードル弁がノズル本体に設けられ
た弁座に対して可動することにより弁の開閉動作がなさ
れ、燃料を間欠噴射する燃料噴射弁において、ニードル
弁の一端に形成されたニードル弁端部外周に環状溝を形
成し、該ニードル弁端部外周に嵌合可能な内径を有する
円筒状のプランジヤを嵌合し、前記環状溝近傍のプラン
ジヤ端面部の材料を押圧塑性変形させて前記環状溝内へ
流動した材料と前記環状溝内の突起とを噛合結合させる
ようにしたことを特徴とする燃料噴射弁の製造方法。
1. An electromagnetic fuel injection valve for a time-controlled low-pressure injection system of an internal combustion engine with a suction pipe injection system, comprising a needle valve fixed to a plunger that is attracted by an electromagnetic coil arranged in a casing. In a fuel injection valve that intermittently injects fuel by opening and closing the valve by moving relative to a valve seat provided in the nozzle body, an annular groove is formed on the outer periphery of the needle valve end formed at one end of the needle valve. Then, a cylindrical plunger having an inner diameter that can be fitted to the outer periphery of the end of the needle valve is fitted, and the material on the end face of the plunger near the annular groove is press-plastically deformed, and the material flows into the annular groove. A method of manufacturing a fuel injection valve, characterized in that the protrusion in the annular groove is engaged with the protrusion.
2.特許請求の範囲第1項記載の発明において、ニード
ル弁の一端に形成されたニードル弁端部外周に形成され
た環状溝内に凹凸を設けたことを特徴とする燃料噴射弁
の製造方法。
2. A method of manufacturing a fuel injection valve according to the invention as claimed in claim 1, characterized in that unevenness is provided in an annular groove formed on the outer periphery of a needle valve end formed at one end of the needle valve.
JP29273585A 1985-12-27 1985-12-27 Manufacture of fuel injection valve Pending JPS62153562A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29273585A JPS62153562A (en) 1985-12-27 1985-12-27 Manufacture of fuel injection valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29273585A JPS62153562A (en) 1985-12-27 1985-12-27 Manufacture of fuel injection valve

Publications (1)

Publication Number Publication Date
JPS62153562A true JPS62153562A (en) 1987-07-08

Family

ID=17785645

Family Applications (1)

Application Number Title Priority Date Filing Date
JP29273585A Pending JPS62153562A (en) 1985-12-27 1985-12-27 Manufacture of fuel injection valve

Country Status (1)

Country Link
JP (1) JPS62153562A (en)

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