JPS5896164A - Fuel injection nozzle - Google Patents
Fuel injection nozzleInfo
- Publication number
- JPS5896164A JPS5896164A JP56193853A JP19385381A JPS5896164A JP S5896164 A JPS5896164 A JP S5896164A JP 56193853 A JP56193853 A JP 56193853A JP 19385381 A JP19385381 A JP 19385381A JP S5896164 A JPS5896164 A JP S5896164A
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- valve
- pressure
- fuel reservoir
- nozzle
- 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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
- F02M51/0685—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature and the valve being allowed to move relatively to each other or not being attached to each other
-
- 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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/08—Injectors peculiar thereto with means directly operating the valve needle specially for low-pressure fuel-injection
-
- 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
- F02M63/0007—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using electrically actuated valves
Abstract
Description
【発明の詳細な説明】
この発明は燃料噴射ノズル、詳しくは電子制御ガソリン
噴射装置に使用される燃料噴射ノズルに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel injection nozzle, and more particularly to a fuel injection nozzle used in an electronically controlled gasoline injection device.
従来の燃料噴射ノズル、特に電気的に開閉制御される内
聞型パルプ（電磁弁）と燃料圧力により自動的に開閉作
動する外開型バルブ（自動弁）とを組合せた燃料噴射ノ
ズルとしては、例えば実願昭５６−９６５１３号公報に
記載されたものが本出願人より提案されている。Conventional fuel injection nozzles, especially fuel injection nozzles that combine an internal valve (electromagnetic valve) that is electrically controlled to open and close with an external valve (automatic valve) that automatically opens and closes based on fuel pressure, For example, the one described in Japanese Utility Model Application No. 56-96513 has been proposed by the present applicant.
この燃料噴射ノズルについて説明すると、第１図におい
て、ｌはケーシングであり、このケーシング１の先端に
はノズルケース２が固着されている。ノズルケース２の
先端にはノズルホルダー３が固着され、これらのノズル
ケー ス２とノズルホルダー３との間には燃料溜室４が
形成されている。この燃料溜室４はケーシング１および
ノズルケース２に形成された燃料供給通路５に連通孔６
を介して連通しており、この連通孔６は電磁弁７によっ
て開閉される。前記ノズルホルダー３は外開式のポペッ
ト弁８を保持し、燃料溜室４の燃料圧力が所定値以上に
なると該ポペット弁８が燃料噴射口を開口して燃料を噴
射する。To explain this fuel injection nozzle, in FIG. 1, l is a casing, and a nozzle case 2 is fixed to the tip of the casing 1. A nozzle holder 3 is fixed to the tip of the nozzle case 2, and a fuel reservoir chamber 4 is formed between the nozzle case 2 and the nozzle holder 3. This fuel reservoir chamber 4 is connected to a fuel supply passage 5 formed in the casing 1 and the nozzle case 2 through a communication hole 6.
This communication hole 6 is opened and closed by a solenoid valve 7. The nozzle holder 3 holds an outward-opening poppet valve 8, and when the fuel pressure in the fuel reservoir chamber 4 exceeds a predetermined value, the poppet valve 8 opens a fuel injection port to inject fuel.
また、前記ケーシングｌ内にはボビン９に巻き付けられ
たコイル１０が収納されており、このコイル１０の中心
部には主磁極部１１が形成されている。該主磁極部１１
はケーシング１の後端に固着されるソレノイドキャンプ
１２該の軸心部の一部分によって形成され、該主磁極部
ＩＩにも前記燃料供給通路５が形成されている。さらに
、前記電磁弁７はアーマチュア１３に固着され、この°
ｒ−マチュア１３と主磁極部１１との間にはパルプスプ
リング１４が縮設されている。したがって、前記連通孔
６は、通常はパルプスプリング１４に付勢された電磁弁
７によって閉止されているが、コイル１０への通電によ
り主磁極部】１が磁化するとアーマチュア１３がこの主
磁極部１１に吸引されて電磁弁７が図中上動じ開放され
ることになる。Further, a coil 10 wound around a bobbin 9 is housed in the casing 1, and a main magnetic pole portion 11 is formed in the center of the coil 10. The main magnetic pole part 11
is formed by a portion of the axial center of the solenoid camp 12 fixed to the rear end of the casing 1, and the fuel supply passage 5 is also formed in the main magnetic pole portion II. Furthermore, the solenoid valve 7 is fixed to the armature 13, and this
A pulp spring 14 is compressed between the r-mature 13 and the main pole portion 11. Therefore, the communication hole 6 is normally closed by the solenoid valve 7 biased by the pulp spring 14, but when the main magnetic pole section 1 is magnetized by energizing the coil 10, the armature 13 The solenoid valve 7 is opened as shown in the figure.
なお、１５は燃料通路である。また、燃料供給通路５に
は燃料タンク１６から燃料ポンプ１７によって吸い上げ
られた燃料がプレッシャレギュレータ１８により調圧さ
れて供給され、燃料通路１５を経由して連通孔６近傍に
導入される。よって、バルブ７が連通孔６を開口すると
燃料溜室４内へ燃料が流入し、該室４内の燃料圧力の上
昇によってポペット弁８の針弁１９がスプリング２０に
抗して自動的に開弁しコイルＩＯの通電時間に対応する
量の燃料が燃料噴射口より噴射される。Note that 15 is a fuel passage. Further, fuel sucked up from a fuel tank 16 by a fuel pump 17 is supplied to the fuel supply passage 5 after being pressure regulated by a pressure regulator 18, and is introduced into the vicinity of the communication hole 6 via the fuel passage 15. Therefore, when the valve 7 opens the communication hole 6, fuel flows into the fuel reservoir chamber 4, and the rise in fuel pressure in the chamber 4 causes the needle valve 19 of the poppet valve 8 to open automatically against the spring 20. An amount of fuel corresponding to the energization time of the valve control coil IO is injected from the fuel injection port.
プレッシャレギュレータ１８は、吸気管負圧または大気
圧が導入されるダイヤフラム室２２と、燃料ポンプ１７
からの燃料が供給される燃料室詔と、にダイヤフラム２
４によって区分されている。ダイヤフラム２４は、スプ
リング５に付勢されて燃料タンク１６に連通ずる燃料放
出孔２６を開閉するシートバルブ２７を有している。し
たがって、スプリング５によって設定される燃料圧力（
通常２〜３ｋｇ／ａＪ）より燃焼室詔内の圧力が高い場
合は、ダイヤフラム２４がダイヤフラム室２２側に変位
して燃料放出孔２６を開口し燃料を燃料タンク１６に放
出し、これによって燃料供給通路５に圧送される燃料圧
力を一定に保持することになる。The pressure regulator 18 includes a diaphragm chamber 22 into which intake pipe negative pressure or atmospheric pressure is introduced, and a fuel pump 17.
The fuel chamber 2 is supplied with fuel from the diaphragm 2.
It is divided by 4. The diaphragm 24 has a seat valve 27 that is biased by the spring 5 and opens and closes a fuel discharge hole 26 communicating with the fuel tank 16. Therefore, the fuel pressure (
When the pressure inside the combustion chamber is higher than the pressure (normally 2 to 3 kg/aJ), the diaphragm 24 is displaced toward the diaphragm chamber 22 side, opens the fuel discharge hole 26, and releases the fuel into the fuel tank 16, thereby supplying fuel. The pressure of the fuel pumped into the passage 5 is kept constant.
しかしながら、このような従来の燃料噴射ノズルにあっ
ては、以下の理由から近時要求されている燃費向上の為
の微小噴射量制御が困難であるという問題点があった。However, such conventional fuel injection nozzles have a problem in that it is difficult to perform minute injection amount control to improve fuel efficiency, which is required in recent years, for the following reasons.
すなわち、第２図に模式的に示すように、電磁弁７に供
給される燃料の圧力をＰｌ、燃料溜室４内の圧力を（Ｐ
、（ｔ））、外開式ポペット弁８から噴射される被噴射
雰囲気（例えばシリンダの燃焼室）の圧力をＰ８、パル
プスプリング１４の付勢力を１１、コイル１０の通電時
主磁極部１１がアーマチュア１３を吸引する吸引力をＦ
３、ボベ・２ト弁８のスプリング２０の付勢力をＦ８、
電磁弁７とシート面内面面積をＡ１、ポペット弁８の針
弁１９とその弁座によって形成されるシート面内面面積
をＡ、とすると、ポペット弁８は電磁弁７の開弁時に、
ＡｉＰｇ （ｔｚ） ＞Ａ２ＰＨ十Ｐ８の関係が生じる
と開弁する。また、電磁弁７、ポペット弁８の双方開放
時には、Ａ２１”ｌ （ｔ２）≧Ａ２Ｐ８＋Ｆ８の関係
がこれらに生じ、ＰＨ＞ ｈ （ｔａ）の関係が生しＣ
いる。なお、ポペット弁８から噴射される燃料噴射量は
（ｈ ＰＨ）” に比例する。そして、電磁弁７の閉
止時には、燃料溜室４からポペット弁８に至る燃料回路
に油撃が生じること、および、ポペット弁８固有の応答
遅れがあることから、ポペット弁８の閉弁時には、燃料
溜室４内の圧力Ｐ ｗ （ｔｓ）はポペット弁８のスプ
リング２０により設定される静的閉弁圧Ｐ８′に対して
Ｐ２（ｔ８）＜Ｐ、’の関係を有する。一方、電磁弁７
の開閉時その駆動力ＧはＧ ＝ Ｆ、−ＦドＡ ｒ （
Ｐｌ−ｈ）であるから（Ｐ＋ Ｐｇ）が大きいほどＧ
は小さくなり電磁弁７の応答性が悪化し、ひいては燃料
噴射ノズル自体の応答性をも悪化させることになる。こ
れは該ノズルの浪１費時間を増加させることにもつなが
る。このように従来の燃料噴射ノズルにあっては前述の
油撃およびポペット弁８の応答遅れによって、ポペット
弁８閉止後の燃料溜室４内の圧力Ｐｇ（ｔａ）が前記Ｐ
２′またはＰ＋に比較して著しく低下するため、燃料噴
射ノズルの応答性が悪化し、浪費時間が増加する。この
結果、燃料噴射ノズルが正常作動するようにコイル１０
への通電時間、すなわちパルス中を大きくしなければな
らず、最小噴射量が増大し、エンジンの要求する最小噴
射量を達成できないという問題点があった。That is, as schematically shown in FIG.
, (t)), the pressure of the atmosphere to be injected (for example, the combustion chamber of a cylinder) injected from the outward-opening poppet valve 8 is P8, the biasing force of the pulp spring 14 is 11, and the main magnetic pole portion 11 of the coil 10 is energized. The suction force that suctions the armature 13 is F.
3. Set the biasing force of the spring 20 of the bovet valve 8 to F8,
If the inner surface area of the solenoid valve 7 and the seat surface is A1, and the inner surface area of the seat surface formed by the needle valve 19 of the poppet valve 8 and its valve seat is A, then when the solenoid valve 7 is opened, the poppet valve 8
When the relationship AiPg (tz)>A2PH+P8 occurs, the valve opens. Furthermore, when both the solenoid valve 7 and the poppet valve 8 are open, a relationship of A21''l (t2)≧A2P8+F8 occurs between them, and a relationship of PH> h (ta) occurs.
There is. Note that the amount of fuel injected from the poppet valve 8 is proportional to (h PH)''. When the solenoid valve 7 is closed, a sudden shock occurs in the fuel circuit from the fuel reservoir chamber 4 to the poppet valve 8. In addition, since there is a response delay inherent to the poppet valve 8, when the poppet valve 8 is closed, the pressure P w (ts) in the fuel storage chamber 4 is the static valve closing pressure set by the spring 20 of the poppet valve 8. There is a relationship of P2(t8)<P,' with respect to P8'.On the other hand, the solenoid valve 7
When opening and closing, the driving force G is G = F, -F (
Pl−h), so the larger (P+Pg), the more G
becomes smaller, deteriorating the responsiveness of the electromagnetic valve 7, which in turn deteriorates the responsiveness of the fuel injection nozzle itself. This also leads to an increase in the time spent on the nozzle. As described above, in the conventional fuel injection nozzle, due to the above-mentioned oil shock and the response delay of the poppet valve 8, the pressure Pg(ta) in the fuel reservoir chamber 4 after the poppet valve 8 is closed is lower than the above-mentioned Pg.
2' or P+, the response of the fuel injection nozzle deteriorates and wasted time increases. As a result, the coil 10 is
The time during which the current is energized, that is, during the pulse, must be increased, which increases the minimum injection amount, resulting in a problem that the minimum injection amount required by the engine cannot be achieved.
この発明はこのような従来の問題点に着目しくなされた
もので、電磁弁と自動弁との間の燃料溜室内に自動弁の
固有振動数より低い固有振動数を有する可変容積部材を
介装し、この可変容積部材によって燃料溜室内を狭めて
自動弁閉弁後の燃料溜室内の圧力を上昇させることによ
り、上記問題点を解決することを目的としている。This invention has been made to address these conventional problems, and includes a variable volume member having a natural frequency lower than the natural frequency of the automatic valve interposed in the fuel reservoir between the solenoid valve and the automatic valve. However, it is an object of the present invention to solve the above problem by narrowing the inside of the fuel reservoir using this variable volume member and increasing the pressure inside the fuel reservoir after automatic valve closing.
以下、この発明を図面に基づいて説明する。The present invention will be explained below based on the drawings.
第３．４．５図はこの発明の一実施例を示す図である。Figures 3.4.5 are diagrams showing one embodiment of the present invention.
なお、以下の説明において従来と同一部分は同一符号を
使用する。第３図において、■はケーシングであり、こ
のケーシング−の先端にはノズルケース２が後端にはソ
レノイドキャップ１２がそれぞれ一体に固着されている
。ノズルケース２の先端にはノズルホルダー３が固着さ
れ、該ノズルホルダー３は外開式のポペット８ （いわ
ゆる自動弁）を保持している。コネクター３１に接続さ
れたコイル１０はボビン９に巻き付けられてケーシング
−内に収納され、ソレノイドキャップ１２の突出部を取
り囲んでこの突出部を磁化して主磁極部１１とする。こ
れらのソレノイドキャンプ１２、ノズルケース２に形成
された燃料供給通路５には一体に固着されたアーマチュ
ア１３および電磁弁７が移動可能に（図中では上下動可
能に）収納されており、アーマチュア１３と主磁極部１
１との間にはバルブスプリング１４が縮設されている。In the following description, the same parts as those in the prior art are denoted by the same reference numerals. In FIG. 3, ``■'' is a casing, and a nozzle case 2 is fixed to the front end of the casing, and a solenoid cap 12 is fixed to the rear end thereof. A nozzle holder 3 is fixed to the tip of the nozzle case 2, and the nozzle holder 3 holds an outward-opening poppet 8 (so-called automatic valve). The coil 10 connected to the connector 31 is wound around the bobbin 9 and housed in the casing, surrounds the protrusion of the solenoid cap 12, and magnetizes the protrusion to form the main magnetic pole part 11. An armature 13 and a solenoid valve 7, which are integrally fixed to each other, are movably housed in the solenoid camp 12 and the fuel supply passage 5 formed in the nozzle case 2. and main magnetic pole part 1
A valve spring 14 is compressed between the valve spring 1 and the valve spring 1.
電磁弁７は燃料供給通路５の円錐状開口端を開閉可能に
設けられコイル１０の非通電時はバルブスプリング１４
に付勢されて該開口端を閉止している。なお、１５はア
ーマチュア１３および電磁弁７に形成された燃料通路で
ある。また、前記ノズルケース２の内部にはノズルホル
ダー３に閉止されて中空の燃料溜室４が形成されており
、この燃料溜室４は電磁弁７を介して加圧燃料が燃料ポ
ンプからプレッシャレギュレータを介して導入される前
記燃料供給通路５に連通している。ここで、この発明に
あっては、燃料溜室４内の燃料の圧力が所定値以上にな
ったときスプリング２０に抗して燃料８９２．１
噴射口を開口して燃料を噴射する前記ポペット弁８は、
所定の固有振動数を有する自動弁とし”（作用する。燃
料溜室４内には、このポペット弁８の固有振動数よりも
低い固有振動数を有する可変容積部材３２、すなわちこ
の実施例では第４．５図に詳示する中空円筒状に形成さ
れたベローズが介装されている。このベローズ３２につ
いて説明すると、ベローズ３２は断面波形状のばね鋼の
薄板によって形成されており、そのバネ定数と質量との
比は、ポペット弁８のスプリング２０のバネ定数と可動
部（針弁１９）の質量との比よりも小さく設定されてい
る。したがって、該ベローズ３２（可変容積部材）は、
電磁弁７の開弁時は燃料溜室４内の圧力上昇によって収
縮し、電磁弁７およびポペット弁８の閉弁時にはポペッ
ト弁８が閉弁した後、燃料溜室４内の容積を減少させる
ように復元膨張することになり、その結果、燃料溜室４
内を所定圧力（ス、プリング２０の付勢力よりも小さい
）に保持することになる。The solenoid valve 7 is provided to be able to open and close the conical opening end of the fuel supply passage 5, and when the coil 10 is not energized, the valve spring 14
is biased to close the open end. Note that 15 is a fuel passage formed in the armature 13 and the solenoid valve 7. Further, a hollow fuel reservoir chamber 4 is formed inside the nozzle case 2 and is closed by a nozzle holder 3. Pressurized fuel is supplied to the fuel reservoir chamber 4 from a fuel pump via a solenoid valve 7 to a pressure regulator. The fuel supply passage 5 is connected to the fuel supply passage 5, which is introduced through the fuel supply passage 5. Here, in the present invention, the poppet valve opens the fuel injection port 892.1 against the spring 20 and injects the fuel when the pressure of the fuel in the fuel reservoir chamber 4 exceeds a predetermined value. 8 is
A variable volume member 32 having a natural frequency lower than the natural frequency of the poppet valve 8, that is, a variable volume member 32 in this embodiment, has a natural frequency lower than the natural frequency of the poppet valve 8. A bellows formed in a hollow cylindrical shape as shown in Fig. 4.5 in detail is interposed therein.The bellows 32 is made of a thin plate of spring steel with a corrugated cross section, and its spring constant is The ratio of the spring constant of the spring 20 of the poppet valve 8 to the mass of the movable part (needle valve 19) is set smaller than the ratio of the mass of the bellows 32 (variable volume member).
When the solenoid valve 7 is opened, the fuel reservoir chamber 4 is contracted due to an increase in pressure, and when the solenoid valve 7 and the poppet valve 8 are closed, the volume inside the fuel reservoir chamber 4 is reduced after the poppet valve 8 is closed. As a result, the fuel reservoir chamber 4
The internal pressure is maintained at a predetermined pressure (less than the biasing force of the spring 20).
次に作用について説明する。Next, the effect will be explained.
まず、図示していない燃料ポンプによって所定圧力に（
例えば２〜３ ｋｇ／ｃｉ）加圧されて燃料タンクから
燃料供給通路５に導入された燃料は燃料通路１５を経由
して電磁弁７の先端部近傍に供給される。ここで、図示
していないコントロールユニットによってコイル１０に
通電すると主磁極弁１１が励磁され、バルブスプリング
１４に抗してアーマチュア１３および電磁弁７をこの主
磁極部１１に吸引する。この結果、燃料溜室４内に所定
圧力の燃料が流入し該室４内の圧力が上昇する。なお、
燃料流入前のベローズ３２は、その固有振動数によって
所定の容積を維持して膨張している。次いで、この圧力
上昇によってベローズ３２は収縮し、また同時に外開式
ポペット弁８の針弁１９がスプリング２０に抗して自動
的に開弁し、燃料噴射口より燃料を噴射する。次いで、
コイル１０への通電を遮断すると、電磁弁７はバルブス
プリング１４によって閉弁し、その結果、燃料溜室４内
の圧力は減少する。このとき、０
ポペット弁８の固有振動数がベローズ３２の固有振動数
より高いため、ポペット弁８に対してベローズ３２の応
答性が悪く、すなわちポペット弁８の閉弁速度よりもベ
ローズ３２の復元（膨張）速度が遅く、この結果、ポペ
ット弁８閉弁後にもベローズ３２は復元膨張を続ける。First, a predetermined pressure (
Fuel that is pressurized (for example, 2 to 3 kg/ci) and introduced from the fuel tank into the fuel supply passage 5 is supplied to the vicinity of the tip of the solenoid valve 7 via the fuel passage 15. Here, when the coil 10 is energized by a control unit (not shown), the main magnetic pole valve 11 is excited, and the armature 13 and the electromagnetic valve 7 are attracted to the main magnetic pole part 11 against the valve spring 14 . As a result, fuel at a predetermined pressure flows into the fuel reservoir chamber 4, and the pressure within the chamber 4 increases. In addition,
Before the fuel flows into the bellows 32, the bellows 32 expands while maintaining a predetermined volume due to its natural frequency. Next, the bellows 32 contracts due to this pressure increase, and at the same time, the needle valve 19 of the outward-opening poppet valve 8 automatically opens against the spring 20, and fuel is injected from the fuel injection port. Then,
When the current to the coil 10 is cut off, the solenoid valve 7 is closed by the valve spring 14, and as a result, the pressure in the fuel reservoir chamber 4 decreases. At this time, since the natural frequency of the poppet valve 8 is higher than the natural frequency of the bellows 32, the responsiveness of the bellows 32 to the poppet valve 8 is poor. The (expansion) speed is slow, and as a result, the bellows 32 continues to restore and expand even after the poppet valve 8 is closed.
したがって、外開式ポペット弁８の閉弁後、燃料溜室４
内に残留した燃料の圧力は圧縮されて上昇することにな
る。ただし、この室４内の圧力上昇はスプリング２０に
抗して針弁１９を開放移動させるまでには達しない。次
いで、再びコイル１ｏに通電し、電磁弁７を開弁すると
燃料溜室４内の圧力上昇により電磁弁７の開弁に対する
ポペット弁８の開弁応答性が向上し、従来の欠点である
応答遅れによる時間の浪費を短縮できる。以後、ベロー
ズ３２は上述した作用を繰り返すことになり、ポペット
弁８の閉弁時に燃料溜室４内の圧力は所定の圧力（針弁
１９を開弁しない程度の圧力）に保持されることになる
。Therefore, after the outward opening type poppet valve 8 is closed, the fuel reservoir chamber 4
The pressure of the fuel remaining inside will be compressed and rise. However, this pressure increase within the chamber 4 does not reach the point where the needle valve 19 is moved to open against the spring 20. Next, when the coil 1o is energized again and the solenoid valve 7 is opened, the pressure in the fuel storage chamber 4 increases, which improves the response of the poppet valve 8 to the opening of the solenoid valve 7, improving the response that was a drawback of the conventional method. Time wasted due to delays can be reduced. Thereafter, the bellows 32 will repeat the above-mentioned action, and the pressure in the fuel reservoir chamber 4 will be maintained at a predetermined pressure (a pressure that does not open the needle valve 19) when the poppet valve 8 is closed. Become.
第６図にはこの発明の他の実施例を示してぃｌす
る。この実施例では、可変容積部材として円筒状の耐ガ
ソリン性ゴム部材３３を使用している。FIG. 6 shows another embodiment of the invention. In this embodiment, a cylindrical gasoline-resistant rubber member 33 is used as the variable volume member.
このゴム部材３３の固有振動数もポペット弁８のそれよ
りも低く設定しており、該ポペット弁８閉弁後燃料溜室
４内の容積を減少させるように膨張（１元）する。その
他の構成および作用は前述の実施例と同様である。The natural frequency of this rubber member 33 is also set lower than that of the poppet valve 8, and after the poppet valve 8 is closed, it expands (by 1 element) so as to reduce the volume inside the fuel reservoir chamber 4. Other configurations and operations are similar to those of the previous embodiment.
以上説明してきたように、この発明によれば、加圧燃料
が導入される燃料通路と、該燃料通路を開閉する電磁弁
と、該電磁弁を介して燃料通路に連通ずる燃料溜室と、
前記燃料溜室内の燃料の圧力に応じて開閉する自動弁と
、を備えた燃料噴射ノズルにおいて、前記自動弁の固有
振動数より低い固有振動数を有・し、自動弁の閉弁後前
記燃料溜室の容積を減少させて該燃料溜室内を所定圧力
に保持する可変容積部材を設けたため、ボ電磁弁の閉弁
時、燃料溜室内の圧力低下に伴い、自動弁の閉弁速度よ
り遅い速度で可変容積部材が燃料溜室内を徐々に狭める
ことにより、燃料溜室内を所定圧力まで上昇させてミ燃
２
料噴射ノズルの応答性を向上させることができる。また
、その結果、電磁弁駆動用コイルのパルス中を短くでき
、微小噴射量制御が可能となった。As explained above, according to the present invention, a fuel passage into which pressurized fuel is introduced, a solenoid valve that opens and closes the fuel passage, a fuel reservoir chamber communicating with the fuel passage via the solenoid valve,
A fuel injection nozzle comprising: an automatic valve that opens and closes depending on the pressure of fuel in the fuel reservoir; Since a variable volume member is provided to reduce the volume of the fuel reservoir and maintain a predetermined pressure within the fuel reservoir, when the solenoid valve closes, the closing speed is slower than that of an automatic valve as the pressure within the fuel reservoir decreases. By gradually narrowing the inside of the fuel reservoir by the variable volume member at a speed, the pressure inside the fuel reservoir can be raised to a predetermined pressure, thereby improving the responsiveness of the fuel injection nozzle. Additionally, as a result, the duration of the pulse of the electromagnetic valve driving coil can be shortened, making it possible to control minute injection amounts.
第１図は従来の燃料噴射ノズルを示すその断面図、第２
図はその作用説明図、第３図はこの発明に係る燃料噴射
ノズルの一実施例を示すその断面図、断４図は第３図の
ベローズを示す平面図、第５図は第４図の■−■矢視断
面図、第６図はこの発明の他の実施例を示す部分断面図
である。
４・・・・・・燃料溜室、 ５・・・・・・燃料通路、
７・・・・・・電磁弁、
８・・・・・・ポペット弁（自動弁）、３２．３３・・
・・・・可変容積部材
特許用願人 日産自動車株式会社代理人弁理士
有我軍一部
３
第 ４ 図
第６
＼
ン
２り
５Figure 1 is a sectional view showing a conventional fuel injection nozzle;
3 is a sectional view showing one embodiment of the fuel injection nozzle according to the present invention, sectional view 4 is a plan view showing the bellows in FIG. 3, and FIG. 5 is a diagram showing the bellows in FIG. 6 is a partial sectional view showing another embodiment of the present invention. 4...Fuel storage chamber, 5...Fuel passage,
7...Solenoid valve, 8...Poppet valve (automatic valve), 32.33...
...Variable volume member patent applicant Nissan Motor Co., Ltd. Patent attorney Ugagun Part 3 Figure 4 Figure 6 ＼ N2ri 5
Claims (1)
る電磁弁と、該電磁弁を介して燃料通路に連通ずる燃料
溜室と、該燃料溜室内の燃料の圧力に応じて開閉する自
動弁と、を備えた燃料噴射ノズルにおいて、前記自動弁
の固有振動数よりも低い固有振動数を有し、自動弁の閉
弁後前記燃料溜室の容積を減少させて該燃料溜室内を所
定圧力に保持する可変容積部材を設けたことを特徴とす
る燃料噴射ノズル。A fuel passage into which pressurized fuel is introduced, a solenoid valve that opens and closes the fuel passage, a fuel reservoir that communicates with the fuel passage via the solenoid valve, and opens and closes according to the pressure of the fuel in the fuel reservoir. A fuel injection nozzle equipped with an automatic valve, which has a natural frequency lower than the natural frequency of the automatic valve, reduces the volume of the fuel reservoir after the automatic valve closes, and causes the inside of the fuel reservoir to flow. A fuel injection nozzle characterized by being provided with a variable volume member that maintains a predetermined pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56193853A JPS5896164A (en) | 1981-12-02 | 1981-12-02 | Fuel injection nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56193853A JPS5896164A (en) | 1981-12-02 | 1981-12-02 | Fuel injection nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5896164A true JPS5896164A (en) | 1983-06-08 |
Family
ID=16314836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56193853A Pending JPS5896164A (en) | 1981-12-02 | 1981-12-02 | Fuel injection nozzle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5896164A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010096182A (en) * | 2008-10-15 | 2010-04-30 | Robert Bosch Gmbh | Injection device |
| CN101798978A (en) * | 2010-03-24 | 2010-08-11 | 朱小平 | Electronic control split-type fuel injector |
-
1981
- 1981-12-02 JP JP56193853A patent/JPS5896164A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010096182A (en) * | 2008-10-15 | 2010-04-30 | Robert Bosch Gmbh | Injection device |
| US8678302B2 (en) | 2008-10-15 | 2014-03-25 | Robert Bosch Gmbh | Injection device |
| CN101798978A (en) * | 2010-03-24 | 2010-08-11 | 朱小平 | Electronic control split-type fuel injector |
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