JPH0526948B2 - - Google Patents
Info
- Publication number
- JPH0526948B2 JPH0526948B2 JP2328385A JP2328385A JPH0526948B2 JP H0526948 B2 JPH0526948 B2 JP H0526948B2 JP 2328385 A JP2328385 A JP 2328385A JP 2328385 A JP2328385 A JP 2328385A JP H0526948 B2 JPH0526948 B2 JP H0526948B2
- Authority
- JP
- Japan
- Prior art keywords
- spring
- nozzle
- nozzle needle
- fuel injection
- needle
- 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 - Lifetime
Links
- 238000002347 injection Methods 0.000 claims description 25
- 239000007924 injection Substances 0.000 claims description 25
- 239000000446 fuel Substances 0.000 claims description 23
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は燃料噴射弁に関するものであり、特に
は複数の開弁圧調整用バネを用いることにより、
燃料噴射始めの燃料流量立ち上がりを鋭くし、さ
らに負荷に応じたニードルリフト量が得られるよ
うにしたことを特徴とするデイーゼル機関用燃料
噴射弁に係るものである。Detailed Description of the Invention (Industrial Application Field) The present invention relates to a fuel injection valve, and in particular, by using a plurality of valve opening pressure adjustment springs,
This invention relates to a fuel injection valve for a diesel engine, characterized in that the fuel flow rate rises sharply at the beginning of fuel injection, and furthermore, a needle lift amount corresponding to the load can be obtained.
（従来の技術）
従来のこの種の燃料噴射弁としては、実開昭56
−129568、実開昭56−47254などに開示されるも
のがある。(Prior art) As a conventional fuel injection valve of this type,
-129568, Utility Model Application Publication No. 56-47254, etc.
（発明が解決しようとする問題点）
これらの従来のものは２個のバネが並列に機能
するように配置すると共に各々のバネのセツト荷
重を各々独立に調整しているので、セツト荷重の
調整に手間がかかると共に、部品点数が多くなる
等の問題点があつた。(Problems to be Solved by the Invention) In these conventional springs, two springs are arranged so that they function in parallel, and the set load of each spring is adjusted independently, so it is difficult to adjust the set load. There were problems such as it was time-consuming and required a large number of parts.
（問題点を解決するための手段）
本発明はノズルボデイ内に摺動自在に嵌合され
たノズルニードルにより前記ノズルボデイに設け
られた噴孔を開閉して燃料を間欠的に噴射する燃
料噴射弁において、第１のバネと、第２のバネ
と、中間バネ座と、セツト荷重調整部材と、初期
リフト調整ロツドとを備え、前記ノズルニードル
の一端に閉弁方向に前記第１のバネを負勢し、該
第１バネを前記中間バネ座を介して前記第２のバ
ネにより圧縮方向に負勢し、該第２のバネを前記
セツト荷重調整部材で負勢することにより前記ノ
ズルニードルの開弁圧力を調整すると共に、前記
中間バネ座の前記第２のバネ側の端面に所定の間
隙を持つて対向させて初期リフト調整ロツドを配
設することにより前記ノズルニードルの開弁速度
を変化させる。(Means for Solving the Problems) The present invention provides a fuel injection valve that intermittently injects fuel by opening and closing a nozzle hole provided in a nozzle body by a nozzle needle slidably fitted into the nozzle body. , comprising a first spring, a second spring, an intermediate spring seat, a set load adjustment member, and an initial lift adjustment rod, the first spring being negatively biased in the valve closing direction at one end of the nozzle needle. The first spring is biased in the compression direction by the second spring via the intermediate spring seat, and the second spring is biased negatively by the set load adjusting member to open the nozzle needle. In addition to adjusting the pressure, the valve opening speed of the nozzle needle is changed by disposing an initial lift adjustment rod facing the second spring side end surface of the intermediate spring seat with a predetermined gap therebetween.
（作用）
本発明によれば、第１のバネおよび第２のバネ
がノズルニードルに対して直列に機能する配置と
なるので、セツト荷重調整部材を調整することに
よりノズルニードルの開弁調整が１回ですみ、ま
た中間バネの第２のバネ側の端面と対向する初期
リフト調整ロツドとの間の所定の間〓の設定値を
容易に調整することができるのでノズルニードル
の開弁速度も容易に設定できる。(Function) According to the present invention, since the first spring and the second spring are arranged to function in series with the nozzle needle, the valve opening adjustment of the nozzle needle can be performed by adjusting the set load adjusting member. In addition, the opening speed of the nozzle needle is also easy because the set value of the predetermined distance between the end surface of the intermediate spring on the second spring side and the opposing initial lift adjustment rod can be easily adjusted. Can be set to
（実施例） 以下本発明を実施例に基づいて説明する。(Example) The present invention will be explained below based on examples.
第１図ないし第３図は本発明の第１実施例に関
するものであり、第１図は燃料噴射弁の全体構成
を示す断面図、第２図は第１図の燃料噴射弁のノ
ズル室内圧力に対するニードルリフト量の変化状
況を示すニードルリフト特性図、第３図は第１図
の燃料噴射弁の燃料噴射特性を示す燃料噴射特性
図である。 1 to 3 relate to a first embodiment of the present invention, in which FIG. 1 is a sectional view showing the overall structure of the fuel injection valve, and FIG. 2 is a nozzle chamber pressure of the fuel injection valve shown in FIG. 1. FIG. 3 is a fuel injection characteristic diagram showing the fuel injection characteristics of the fuel injection valve of FIG. 1. FIG.
第１実施例の燃料噴射弁は第１図に示す如く、
ノズルホルダ１の一端にノズルボデイ２をリテー
ニングナツト４で螺合し固定し、ノズルホルダ１
内に第１のバネ６と第２のバネ８とを中間バネ座
７を夾んで直列に配置している。 The fuel injection valve of the first embodiment is as shown in FIG.
The nozzle body 2 is screwed and fixed to one end of the nozzle holder 1 with a retaining nut 4, and the nozzle holder 1
Inside, a first spring 6 and a second spring 8 are arranged in series, including an intermediate spring seat 7.
第１のバネ６はその一端を中間バネ座面７ａに
当接し他端はプレツシヤピン５に当接してノズル
ニードル３を押圧し、第２のバネ８はその一端を
中間バネ座面７ｂに当接し、他端は開弁圧調整ネ
ジ１０と当接している。 The first spring 6 has one end in contact with the intermediate spring seat surface 7a and the other end in contact with the pressure pin 5 to press the nozzle needle 3, and the second spring 8 has one end in contact with the intermediate spring seat surface 7b. , the other end is in contact with the valve opening pressure adjusting screw 10.
開弁圧調整ネジ１０は前記ノズルホルダ１の他
端に設けられたネジと螺合しており、所定開弁圧
を調整した後止めネジ１１で固定され、初期リフ
ト調整ロツド９は開弁圧調整ネジ１０に設けられ
たネジと係合して端面９ａと中間バネ座７の端面
７ｃとの間に設けられる所定の間隙l1を調整した
後、止めネジ１２によつて固定される。 The valve opening pressure adjustment screw 10 is threadedly engaged with a screw provided at the other end of the nozzle holder 1, and is fixed with a set screw 11 after adjusting a predetermined valve opening pressure, and the initial lift adjustment rod 9 is adjusted to the valve opening pressure. After engaging with a screw provided on the adjustment screw 10 to adjust a predetermined gap l 1 provided between the end surface 9a and the end surface 7c of the intermediate spring seat 7, it is fixed by a set screw 12.
次に第１実施例の作動について説明する。 Next, the operation of the first embodiment will be explained.
第１図において図示しない燃料噴射ポンプから
圧送される高圧燃料は、ノズルホルダ１内の燃料
通路１ａおよびノズルボデイ２内の燃料通路２ａ
を通つてノズル室２ｂに達し、ノズルニードル３
を押し上げて弁座２ｃから離れさせる。 High-pressure fuel pumped from a fuel injection pump (not shown) in FIG.
and reaches the nozzle chamber 2b through the nozzle needle 3.
Push up and move it away from the valve seat 2c.
一方、ノズルニードル３は着座時には第１およ
び第２のバネ６，８によつて弁座２ｃに押圧シー
ルされているが、ノズルニードル３が図中のl1′だ
け上昇して、その結果中間バネ座７の他端７ｃが
図中の中間バネ座７のリフト量l1だけ押し上げら
れて初期リフト調整ロツド９の他端９ａと接する
と、第２のバネ８はそれ以上押し縮められなくな
る。 On the other hand, when the nozzle needle 3 is seated, it is pressed and sealed against the valve seat 2c by the first and second springs 6, 8, but the nozzle needle 3 rises by l 1 ' in the figure, and as a result, the middle When the other end 7c of the spring seat 7 is pushed up by the lift amount l1 of the intermediate spring seat 7 in the figure and comes into contact with the other end 9a of the initial lift adjustment rod 9, the second spring 8 can no longer be compressed.
さらにノズルニードル３が上昇して最大ニード
ルリフト量l2に至るまでの間は第１のバネ６のみ
が更に押し縮められると共に第１のバネ６によつ
てのみノズルニードル３の押圧力が与えられる。 Further, until the nozzle needle 3 rises and reaches the maximum needle lift amount l2 , only the first spring 6 is further compressed, and the pressing force of the nozzle needle 3 is applied only by the first spring 6. .
このときノズルルードルを押圧するバネのバネ
定数Ｋは、第１、２のバネ定数をそれぞれk1、k2
とすると、ニードルリフト量０〜l1′ではＫ＝k1.
k2／（k1＋k2）、l1′〜l2ではＫ＝k1となる。この
ため、ノズル室圧力に対するニードルリフト量は
第２図のように与えられる。 At this time, the spring constant K of the spring that presses the nozzle rudder is the first and second spring constants k 1 and k 2 , respectively.
Then, K=k 1 for needle lift amount 0 to l 1 '.
k 2 /(k 1 +k 2 ), K=k 1 for l 1 ′ to l 2 . Therefore, the needle lift amount relative to the nozzle chamber pressure is given as shown in FIG.
すなわち適当な２つのバネ定数k1、k2を選定す
ることにより、初期噴射時には早い立ち上がりの
噴射率を、主噴射時には負荷に応じた噴射率を
各々得ることができ、その結果、燃焼を大幅に改
善することができる。本考案の燃焼噴射弁を用い
た場合の燃料噴射特性を第３図に示す。 In other words, by selecting two appropriate spring constants k 1 and k 2 , it is possible to obtain an injection rate with a fast rise during initial injection and an injection rate that corresponds to the load during main injection, and as a result, combustion can be significantly improved. can be improved. FIG. 3 shows fuel injection characteristics when the combustion injection valve of the present invention is used.
第４図および第５図は第２実施例に関するもの
であり、第４図は要部の構造を示す断面図、第５
図は第４図Ａ方向から見た要部の平面図である。 Figures 4 and 5 relate to the second embodiment; Figure 4 is a sectional view showing the structure of the main part;
The figure is a plan view of the main parts seen from the direction A in FIG. 4.
第１実施例との相違点を中心に説明すると、第
２の実施例は初期リフト調整ロツド９にレバー１
３を一体的に取付けてレバー１３を第５図中の矢
印方向に可動することにより初期リフト調整ロツ
ド９に切られたネジ部９ａを利用して初期リフト
調整ロツド９を中心軸方向に移動調整可能とした
ものである。 Focusing on the differences from the first embodiment, the second embodiment has a lever 1 on the initial lift adjustment rod 9.
3 is integrally attached and the lever 13 is moved in the direction of the arrow in FIG. 5, the initial lift adjustment rod 9 can be moved and adjusted in the direction of the center axis using the threaded part 9a cut in the initial lift adjustment rod 9. This made it possible.
第２実施例によれば噴射弁作動中に運転条件に
応じて所定の間隙l1を外部から調整することがで
きるので、エンジンの運転条件に応じて更に燃焼
の改善を計ることができる。 According to the second embodiment, the predetermined gap l1 can be adjusted from the outside depending on the operating conditions while the injection valve is in operation, so that combustion can be further improved depending on the operating conditions of the engine.
なお、レバー１３を操作する手段は機械式でも
電気式でもかまわない。また、所定の間隙l1の調
整は本実施例に示された他に、種々の変形が可能
である。 Note that the means for operating the lever 13 may be mechanical or electrical. Further, the adjustment of the predetermined gap l1 can be modified in various ways other than those shown in this embodiment.
第６図は第３実施例の要部の構造を示す断面図
である。 FIG. 6 is a sectional view showing the structure of the main part of the third embodiment.
相違点を中心に説明すると、第３の実施例はセ
ツト荷重調整部材として開弁圧調整ネジの代わり
にシム１４を用いたものであり、このようにする
ことによりさらに小型軽量化をはかることができ
る。 Focusing on the differences, the third embodiment uses a shim 14 as the set load adjusting member instead of the valve opening pressure adjusting screw, and by doing so, it is possible to further reduce the size and weight. can.
（発明の効果）
以上説明した如く、本発明によればノズルニー
ドルの開弁圧調整が１回ですむと共に、初期リフ
ト調整ロツド先端の所定の間隙の設定値を容易に
調整することができるので、ノズルニードルの開
弁圧および開弁速度の調整が極めて容易かつ正確
にできるという優れた効果がある。(Effects of the Invention) As explained above, according to the present invention, the opening pressure of the nozzle needle can be adjusted only once, and the set value of the predetermined gap at the tip of the initial lift adjustment rod can be easily adjusted. This has the excellent effect that the valve opening pressure and valve opening speed of the nozzle needle can be adjusted extremely easily and accurately.
また、部品点数を減らすことができるので、小
型軽量化をはかることができるという効果があ
る。 Furthermore, since the number of parts can be reduced, the device can be made smaller and lighter.
第１図ないし第３図は本発明の第１実施例に関
するもので、第１図は燃料噴射弁の全体構成を示
す断面図、第２図は第１図の燃料噴射弁のノズル
室圧力に対するニードルリフト量の変化状況を示
すニードルリフト特性図、第３図は第１図の燃料
噴射弁の燃料噴射特性を示す燃料噴射特性図であ
る。第４図および第５図は第２実施例に関するも
のであり、第４図は要部の構造を示す断面図、第
５図は第４図中Ａ方向から見た要部の平面図であ
る。第６図は第３実施例の要部の構造を示す断面
図である。
２……ノズルボデイ、２ｄ……噴孔、３…ノズ
ルニードル、６……第１のバネ、７……中間バネ
座、８……第２のバネ、９……初期リフト調整ロ
ツド、１０，１４……セツト荷重調整部材をなす
開弁圧調整ネジおよびシム、l1……所定の間隙。
1 to 3 relate to the first embodiment of the present invention, in which FIG. 1 is a sectional view showing the overall structure of the fuel injection valve, and FIG. FIG. 3 is a needle lift characteristic diagram showing changes in the needle lift amount, and FIG. 3 is a fuel injection characteristic diagram showing the fuel injection characteristics of the fuel injection valve of FIG. Figures 4 and 5 relate to the second embodiment, where Figure 4 is a sectional view showing the structure of the main part, and Figure 5 is a plan view of the main part seen from direction A in Figure 4. . FIG. 6 is a sectional view showing the structure of the main part of the third embodiment. 2... Nozzle body, 2d... Nozzle hole, 3... Nozzle needle, 6... First spring, 7... Intermediate spring seat, 8... Second spring, 9... Initial lift adjustment rod, 10, 14 ...Valve opening pressure adjustment screw and shim that form the set load adjustment member, l 1 ...Specified gap.
Claims (1)
ルニードルにより前記ノズルボデイに設けられた
噴孔を開閉して燃料を間欠的に噴射する燃料噴射
弁において、第１のバネと、第２のバネと、中間
バネ座と、セツト荷重調整部材と、初期リフト調
整ロツドとを備え、前記ノズルニードルの一端に
閉弁方向に前記第１のバネを負勢し、該第１のバ
ネを前記中間バネ座を介して前記第２のバネより
圧縮方向に負勢し、該第２のバネを前記セツト荷
重調整部材で負勢することにより前記ノズルニー
ドル開弁圧力を調整すると共に、前記中間バネ座
の前記第２のバネ側の端面に所定の間隙を持つて
対向させ初期リフト調整ロツドを配設することに
より前記ノズルニードルの開弁速度を変化させる
ことを特徴とする燃料噴射弁。1. In a fuel injection valve that intermittently injects fuel by opening and closing a nozzle hole provided in the nozzle body by a nozzle needle slidably fitted into the nozzle body, a first spring, a second spring, , comprising an intermediate spring seat, a set load adjustment member, and an initial lift adjustment rod, the first spring is negatively biased toward one end of the nozzle needle in the valve closing direction, and the first spring is pressed against the intermediate spring seat. The opening pressure of the nozzle needle is adjusted by applying a negative force to the second spring in the compression direction through the second spring, and applying a negative force to the second spring using the set load adjusting member. A fuel injection valve characterized in that the opening speed of the nozzle needle is changed by arranging an initial lift adjustment rod facing the end face on the second spring side with a predetermined gap therebetween.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2328385A JPS61182459A (en) | 1985-02-07 | 1985-02-07 | Fuel injecting valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2328385A JPS61182459A (en) | 1985-02-07 | 1985-02-07 | Fuel injecting valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61182459A JPS61182459A (en) | 1986-08-15 |
| JPH0526948B2 true JPH0526948B2 (en) | 1993-04-19 |
Family
ID=12106275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2328385A Granted JPS61182459A (en) | 1985-02-07 | 1985-02-07 | Fuel injecting valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61182459A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1282937C (en) * | 1995-07-31 | 2006-11-01 | 富士通株式会社 | Medium processor and medium processing method |
-
1985
- 1985-02-07 JP JP2328385A patent/JPS61182459A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61182459A (en) | 1986-08-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |