JPH0763140A - Forming method for injection hole of fuel injection valve - Google Patents
Forming method for injection hole of fuel injection valveInfo
- Publication number
- JPH0763140A JPH0763140A JP21254893A JP21254893A JPH0763140A JP H0763140 A JPH0763140 A JP H0763140A JP 21254893 A JP21254893 A JP 21254893A JP 21254893 A JP21254893 A JP 21254893A JP H0763140 A JPH0763140 A JP H0763140A
- Authority
- JP
- Japan
- Prior art keywords
- hole
- injection
- injection hole
- dome shape
- fuel injection
- 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
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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
-
- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
-
- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、内燃機関用の燃料噴射
弁の噴射孔の形成方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming injection holes in a fuel injection valve for an internal combustion engine.
【０００２】[0002]
【従来の技術】一般に、内燃機関用燃料噴射弁の噴射孔
の断面形状は直円筒状である。しかし、噴射孔のストレ
ート部の長さが大な程、流量係数が小さくなり、また噴
霧粒径が大になり、噴射性能に悪影響を与える。より良
い噴射性能（流量係数大、噴霧粒径小）を実現するに
は、ストレート部長を０に近づけるか、またはストレー
ト部がない、たとえば径が拡大するテーパ孔にすること
が考えられる。しかし、ストレート部を０に近づけるこ
とは板厚小で耐圧上の問題が生じてしまうので、実現性
に乏しい。テーパ孔については、実開昭５８−１６７７
７２号公報が、噴射孔を拡径するテーパ面からなる孔と
した燃料噴射弁を開示している。2. Description of the Related Art Generally, an injection hole of a fuel injection valve for an internal combustion engine has a right cylindrical cross section. However, the longer the straight portion of the injection hole, the smaller the flow coefficient and the larger the spray particle size, which adversely affects the injection performance. In order to realize better injection performance (large flow coefficient, small spray particle size), it is conceivable to make the length of the straight portion close to 0, or to use a taper hole having no straight portion, for example, an enlarged diameter. However, if the straight portion is brought close to 0, the plate thickness is small and a problem of withstand voltage occurs, so that it is not feasible. For taper holes, see Shokai 58-1677
Japanese Patent Publication No. 72 discloses a fuel injection valve in which the injection hole is a hole having a tapered surface for expanding the diameter.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来のテーパ
孔からなる燃料噴射弁噴射孔の加工は、削り出しにより
形成したドーム状チップ先端に円錐状の刃工具を用いて
切削加工せざるを得ないため、図５に示すように、円錐
刃工具１の加工深さにより孔径が変化し、孔２の径が狙
った値に定まり難いという問題があった。穴径が所定値
からずれると、噴射孔によって計量される燃料噴射量が
所定値からずれてしまう。本発明の目的は、噴射性能の
よい（流量係数が大で噴霧粒径小の）円錐断面形状噴射
孔を安定して、したがって高精度にかつばらつきが少な
く、形成できる燃料噴射弁の噴射孔の形成方法を提供す
ることにある。However, in the conventional processing of the fuel injection valve injection hole consisting of a tapered hole, it is inevitable that the tip of the dome-shaped tip formed by shaving is cut using a conical blade tool. Therefore, as shown in FIG. 5, there is a problem that the hole diameter changes depending on the machining depth of the conical blade tool 1 and the diameter of the hole 2 is difficult to set to a target value. If the hole diameter deviates from a predetermined value, the fuel injection amount measured by the injection hole will deviate from the predetermined value. It is an object of the present invention to stably form a conical cross-section injection hole having a high injection performance (a large flow coefficient and a small spray particle size), and therefore, to form an injection hole of a fuel injection valve that can be formed with high accuracy and little variation. It is to provide a forming method.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
の、本発明に係る燃料噴射弁の噴射孔の形成方法は、次
の方法から成る。すなわち、燃料噴射弁の噴射孔をノズ
ル本体と別体のプレートに加工する燃料噴射弁の噴射孔
の形成方法において、平板の所定位置に直円筒状の孔を
加工し、その後前記平板の前記孔周辺部分を所定の曲率
を有するドーム形状に絞り加工して前記孔をテーパ状の
噴射孔に燃料噴射弁の噴射孔の形成方法。A method of forming an injection hole of a fuel injection valve according to the present invention for achieving the above object comprises the following method. That is, in the method of forming the injection hole of the fuel injection valve in which the injection hole of the fuel injection valve is processed into a plate separate from the nozzle body, a straight cylindrical hole is processed at a predetermined position of the flat plate, and then the hole of the flat plate is processed. A method of forming an injection hole of a fuel injection valve by drawing a peripheral portion into a dome shape having a predetermined curvature and making the hole into a tapered injection hole.
【０００５】[0005]
【作用】上記本発明方法では、平板に直円筒状の孔を形
成するため、孔の径は加工深さに無関係に一定で高精度
に一定の孔径に加工できる。そして、この孔を形成した
部分を絞り加工でドーム状に加工するため、孔径は、平
板のストレート状態からドームの弧状にした分だけ大に
はなるが、精度自体はそのまま引きつがれるため、噴射
孔径は高精度にかつばらつき少なく所定値になり、安定
して噴射孔を形成できる。In the above-described method of the present invention, since the straight cylindrical hole is formed in the flat plate, the diameter of the hole is constant irrespective of the processing depth, and the hole diameter can be accurately processed to a constant diameter. Then, since the portion in which this hole is formed is processed into a dome shape by drawing, the hole diameter is increased by the amount of the arc shape of the dome from the straight state of the flat plate, but since the accuracy itself is pulled as it is, The hole diameter has a predetermined value with high accuracy and little variation, and the injection hole can be stably formed.
【０００６】[0006]
【実施例】以下に、本発明の燃料噴射弁の噴射孔の形成
方法の望ましい実施例を、図１〜図４を参照して説明す
る。本発明では、燃料噴射弁のノズル本体とは別体の平
板状のプレート、たとえば平板状の条材（帯鋼）から燃
料噴射弁の先端ノズルプレートに形成し、該ノズルプレ
ートに噴射孔を形成し、これをノズル本体に溶接で固定
するようにする。まず、図１に示すように、平板状プレ
ート１１に、直円筒状の加工工具１２（たとえば、ドリ
ル、ポンチなど）により、直円筒状の孔１３を、板厚方
向に貫通させて、加工する。この場合、直円筒状の孔１
３であるから加工工具１２の加工深さが変化しても孔径
は変化しない。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the method for forming the injection hole of the fuel injection valve of the present invention will be described below with reference to FIGS. According to the present invention, the tip plate of the fuel injection valve is formed from a flat plate, which is separate from the nozzle body of the fuel injection valve, such as a flat strip (steel strip), and injection holes are formed in the nozzle plate. Then, fix it to the nozzle body by welding. First, as shown in FIG. 1, a flat plate-shaped plate 11 is processed by a right-cylindrical processing tool 12 (for example, a drill, a punch, etc.) to form a right-cylindrical hole 13 in the plate thickness direction. . In this case, a straight cylindrical hole 1
Therefore, the hole diameter does not change even if the working depth of the working tool 12 changes.
【０００７】つぎに、図２に示すように、平板状プレー
ト１１の孔１３の周辺部分を、ポンチ１４を用いて、所
定の曲率のドーム形状１５に絞り加工する。ドーム形状
１５は、ポンチ１４のＲ、条材１１の厚さの選択によ
り、調整可能である。この時、ドーム形状の曲率半径小
側１６と曲率半径大側１７の曲率の差異により、直円筒
状であった孔１３はテーパ状の噴射孔１８に変化し、ド
ーム形状１５の外周に向って拡径する円錐状噴射孔１８
が形成される。図２では、加工穴とポンチの軸芯を一致
させた実施例を示したが、噴射穴の向きを変えたい場合
には、ドームの径の範囲内であれば、ポンチと加工穴を
偏心させてもよい。Next, as shown in FIG. 2, the peripheral portion of the hole 13 of the flat plate 11 is drawn with a punch 14 into a dome shape 15 having a predetermined curvature. The dome shape 15 can be adjusted by selecting the radius of the punch 14 and the thickness of the strip 11. At this time, due to the difference in curvature between the small radius side 16 of the dome shape and the large radius side 17 of the dome shape, the straight cylindrical hole 13 changes into a tapered injection hole 18 and moves toward the outer periphery of the dome shape 15. Cone-shaped injection hole 18 with an enlarged diameter
Is formed. FIG. 2 shows an example in which the machined hole and the punch have the same axial center. However, when the direction of the injection hole is desired to be changed, the punch and the machined hole are eccentric within the range of the dome diameter. May be.
【０００８】ドーム形状１５に形成した後、図３に示す
ように、ドーム形状１５の周辺の平板部に取付座１９を
プレス等で成形するかまたは機械加工で削り出し等で形
成し、その後条材１１より分離し、ノズルプレート２０
とする。ノズルプレート２０はノズル本体２１に溶接等
により固定される。２２は溶接部を示す。After forming the dome shape 15, as shown in FIG. 3, the mounting seat 19 is formed on the flat plate portion around the dome shape 15 by pressing or the like, or is formed by machining or the like. Nozzle plate 20 separated from material 11
And The nozzle plate 20 is fixed to the nozzle body 21 by welding or the like. 22 indicates a welded portion.
【０００９】図３の例では、ノズル本体２１に弁座２３
が形成されており、それに対してニードル弁２４が進退
して着座するように構成されている。しかし、この構造
に限るものではなく、図４に示すように、ノズルプレー
ト２０側に弁座２５を形成し、この弁座２５に対してニ
ードル弁２４を進退させて着座させるようにしてもよ
い。図４のように構成すれば、ニードル弁２４とドーム
形状１５との間のデッドスペース２６が小さくなり、デ
ッドスペース２６が大きい場合に生じることがある噴射
後の燃料後だれを抑制することが可能となる。In the example of FIG. 3, the valve body 23 is attached to the nozzle body 21.
Is formed, and the needle valve 24 is configured to move forward and backward to be seated. However, the structure is not limited to this, and as shown in FIG. 4, a valve seat 25 may be formed on the nozzle plate 20 side, and the needle valve 24 may be advanced and retracted with respect to this valve seat 25 to be seated. . With the configuration shown in FIG. 4, the dead space 26 between the needle valve 24 and the dome shape 15 becomes small, and it is possible to suppress fuel dripping after injection that may occur when the dead space 26 is large. Becomes
【００１０】つぎに、上記の噴射孔の形成方法の作用を
説明する。まず、平板状プレート１１に直円筒状の孔１
３を加工するため、孔径は加工工具１２の加工深さによ
らず安定して一定である。このため、孔径の精度が高
い。Next, the operation of the above injection hole forming method will be described. First, a straight cylindrical hole 1 is formed in the flat plate 11.
Since 3 is machined, the hole diameter is stable and constant regardless of the machining depth of the machining tool 12. Therefore, the accuracy of the hole diameter is high.
【００１１】また、孔１３を穿設したプレート１１をド
ーム形状１５に絞り加工するとき、孔径は平板が弧状に
伸びる分大になるが、精度はそのまま引き継がれるた
め、テーパ状の噴射孔１８になった時の孔径は高精度に
所定値になっている。したがって、燃料計量が安定し、
狙った量の燃料を噴射できる。Further, when the plate 11 having the holes 13 formed therein is drawn into a dome shape 15, the hole diameter becomes large as the flat plate extends in an arc shape, but since the accuracy is succeeded as it is, the tapered injection hole 18 is used. When it becomes, the hole diameter has reached the specified value with high accuracy. Therefore, the fuel metering is stable,
You can inject the target amount of fuel.
【００１２】また、孔１３を穿設したドーム形状１５に
するので、平板状プレート１１の段階では直円筒状の孔
であったものが、ドーム形状１５にした段階では自ずと
テーパ状噴射孔１８になっており、テーパ孔を容易にか
つ安価に形成できる。このテーパ状噴射孔１８により、
流量係数が大になり、噴霧粒径が小になり、その結果、
噴射性能のよい燃料噴射弁を提供できる。Further, since the holes 13 are formed in the dome shape 15, the straight cylindrical holes at the stage of the flat plate 11 are automatically changed to the tapered injection holes 18 at the stage of forming the dome 15. Therefore, the tapered hole can be formed easily and inexpensively. With this tapered injection hole 18,
Larger flow coefficient and smaller atomized particle size, resulting in
A fuel injection valve with good injection performance can be provided.
【００１３】また、テーパ孔１８の場合は孔にストレー
ト部がないため、噴射性能を低下させずに板厚を従来に
比べて増大できる。これにより、図４に示すように、弁
座２５をノズルプレート２０自体に加工することが可能
となる。このことにより、従来別工程にて実施された弁
座形成が、ノズル形成と同一工程（同一絞り加工）内で
実施可能となり、大幅なコスト低減が可能である。ま
た、研削等で弁座２５を加工する場合においても、加工
位置が浅い位置のため、加工が容易である。Further, in the case of the tapered hole 18, since there is no straight portion in the hole, the plate thickness can be increased as compared with the conventional case without lowering the injection performance. As a result, as shown in FIG. 4, the valve seat 25 can be machined into the nozzle plate 20 itself. As a result, the valve seat formation, which is conventionally performed in a separate process, can be performed in the same process (same drawing process) as the nozzle formation, and the cost can be significantly reduced. Further, even when the valve seat 25 is machined by grinding or the like, the machining position is shallow, so that the machining is easy.
【００１４】[0014]
【発明の効果】本発明によれば、平板状プレートに直円
筒状の孔を加工し、その後その孔周辺部をドーム形状に
絞り加工するようにしたので、加工深さに影響されるこ
となく高精度の径の直円筒状孔を平板状プレートに穿設
でき、ドーム形状形成においてこの直円筒状孔の精度を
引き継いで、狙った径の高精度の、噴射性能のよいテー
パ状噴射孔を安定して形成できる。According to the present invention, a straight cylindrical hole is formed in a flat plate, and then the peripheral portion of the hole is drawn into a dome shape, so that the processing depth is not affected. A straight cylindrical hole with a high precision diameter can be drilled in a flat plate, and the precision of this straight cylindrical hole can be inherited in forming a dome shape to achieve a highly precise, tapered injection hole with good injection performance. It can be stably formed.
【図１】本発明の一実施例に係る燃料噴射弁の噴射孔の
形成方法における、平板状プレートに直円筒状孔を穿設
する工程の断面図である。FIG. 1 is a cross-sectional view of a step of forming a straight cylindrical hole in a flat plate in a method of forming an injection hole of a fuel injection valve according to an embodiment of the present invention.
【図２】図１の工程で作製された直円筒状の孔をもつプ
レートの孔周辺部分をドーム形状に絞り加工する工程の
断面図である。FIG. 2 is a cross-sectional view of a step of drawing a dome-shaped peripheral portion of a plate having a right cylindrical hole formed in the step of FIG.
【図３】図２の工程で作製されたドーム形状をもつプレ
ートに座を形成してノズル本体に溶接取付けした状態
の、燃料噴射弁先端部の断面図である。FIG. 3 is a cross-sectional view of the tip of the fuel injection valve in a state in which a seat is formed on the dome-shaped plate manufactured in the process of FIG. 2 and is welded to the nozzle body.
【図４】ノズルプレート自体に弁座を形成した場合の、
燃料噴射弁先端部の断面図である。FIG. 4 shows a case where a valve seat is formed on the nozzle plate itself,
It is sectional drawing of a fuel injection valve front-end | tip part.
【図５】ドーム形状部に円錐状加工工具を用いてテーパ
状噴射孔を形成する従来法の断面図である。FIG. 5 is a cross-sectional view of a conventional method of forming a tapered injection hole in a dome-shaped portion using a conical processing tool.
１１ 平板状プレート １２ 加工工具 １３ 直円筒状の孔 １４ ポンチ １５ ドーム形状 １８ 円錐状（テーパ状）噴射孔 １９ 取付座 ２０ ノズルプレート ２１ ノズル本体 ２２ 溶接部 ２３ 弁座 ２４ ニードル弁 ２５ 弁座 11 Flat Plate 12 Processing Tool 13 Right Cylindrical Hole 14 Punch 15 Dome Shape 18 Conical (Tapered) Injection Hole 19 Mounting Seat 20 Nozzle Plate 21 Nozzle Main Body 22 Weld 23 Valve Seat 24 Needle Valve 25 Valve Seat
Claims (1)
のプレートに加工する燃料噴射弁の噴射孔の形成方法に
おいて、平板の所定位置に直円筒状の孔を加工し、その
後前記平板の前記孔周辺部分を所定の曲率を有するドー
ム形状に絞り加工して前記孔をテーパ状の噴射孔にする
ことを特徴とする燃料噴射弁の噴射孔の形成方法。1. A method for forming an injection hole of a fuel injection valve, wherein the injection hole of the fuel injection valve is formed as a plate separate from the nozzle body, wherein a straight cylindrical hole is formed at a predetermined position of the flat plate, and then the flat plate is formed. A method for forming an injection hole of a fuel injection valve, wherein the hole peripheral portion is drawn into a dome shape having a predetermined curvature to form the hole into a tapered injection hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21254893A JPH0763140A (en) | 1993-08-27 | 1993-08-27 | Forming method for injection hole of fuel injection valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21254893A JPH0763140A (en) | 1993-08-27 | 1993-08-27 | Forming method for injection hole of fuel injection valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0763140A true JPH0763140A (en) | 1995-03-07 |
Family
ID=16624513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21254893A Pending JPH0763140A (en) | 1993-08-27 | 1993-08-27 | Forming method for injection hole of fuel injection valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0763140A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998005859A1 (en) * | 1996-08-01 | 1998-02-12 | Robert Bosch Gmbh | Fuel injection valve |
| WO1998028538A1 (en) * | 1996-12-21 | 1998-07-02 | Robert Bosch Gmbh | Valve with combined valve seat body and perforated injection disk |
| US6161781A (en) * | 1998-03-26 | 2000-12-19 | Toyota Jidosha Kabushiki Kaisha | Fuel injector for an internal combustion engine |
| EP0918155A3 (en) * | 1997-11-26 | 2002-08-21 | Hitachi, Ltd. | Fuel injection valve |
| US6935578B1 (en) | 1998-11-25 | 2005-08-30 | Hitachi, Ltd. | Fuel injection valve |
| EP1762723A1 (en) | 2005-09-13 | 2007-03-14 | Hitachi, Ltd. | Injection valve and method of making orifice |
| JP2007146828A (en) * | 2005-10-28 | 2007-06-14 | Hitachi Ltd | Fuel injection valve |
| JP2012097642A (en) * | 2010-11-01 | 2012-05-24 | Mitsubishi Electric Corp | Fuel injection valve |
-
1993
- 1993-08-27 JP JP21254893A patent/JPH0763140A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998005859A1 (en) * | 1996-08-01 | 1998-02-12 | Robert Bosch Gmbh | Fuel injection valve |
| WO1998028538A1 (en) * | 1996-12-21 | 1998-07-02 | Robert Bosch Gmbh | Valve with combined valve seat body and perforated injection disk |
| US6131826A (en) * | 1996-12-21 | 2000-10-17 | Robert Bosch Gmbh | Valve with combined valve seat body and perforated injection disk |
| CN1089859C (en) * | 1996-12-21 | 2002-08-28 | 罗伯特·博施有限公司 | Valve with combined valve seat body and perforated injection disk |
| EP0918155A3 (en) * | 1997-11-26 | 2002-08-21 | Hitachi, Ltd. | Fuel injection valve |
| EP1867869A1 (en) * | 1997-11-26 | 2007-12-19 | Hitachi, Ltd. | Fuel injection valve |
| US6161781A (en) * | 1998-03-26 | 2000-12-19 | Toyota Jidosha Kabushiki Kaisha | Fuel injector for an internal combustion engine |
| US6935578B1 (en) | 1998-11-25 | 2005-08-30 | Hitachi, Ltd. | Fuel injection valve |
| EP1762723A1 (en) | 2005-09-13 | 2007-03-14 | Hitachi, Ltd. | Injection valve and method of making orifice |
| US7874070B2 (en) | 2005-09-13 | 2011-01-25 | Hitachi, Ltd. | Injection valve and method of making orifice |
| JP2007146828A (en) * | 2005-10-28 | 2007-06-14 | Hitachi Ltd | Fuel injection valve |
| JP2012097642A (en) * | 2010-11-01 | 2012-05-24 | Mitsubishi Electric Corp | Fuel injection valve |
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