JPH0245505Y2 - - Google Patents
Info
- Publication number
- JPH0245505Y2 JPH0245505Y2 JP1982165304U JP16530482U JPH0245505Y2 JP H0245505 Y2 JPH0245505 Y2 JP H0245505Y2 JP 1982165304 U JP1982165304 U JP 1982165304U JP 16530482 U JP16530482 U JP 16530482U JP H0245505 Y2 JPH0245505 Y2 JP H0245505Y2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- fuel injection
- needle valve
- fuel
- push rod
- 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
Links
Landscapes
- Fuel-Injection Apparatus (AREA)
Description
【考案の詳細な説明】
本考案は燃料噴射の安定化をはかりうる内燃機
関の燃料噴射ノズルに関するものである。[Detailed Description of the Invention] The present invention relates to a fuel injection nozzle for an internal combustion engine that can stabilize fuel injection.
従来の内燃機関、特に自動車搭載用のデイーゼ
ル機関に使用される燃料噴射ノズルは、例えば実
開昭56−145665号公報に記載されているように、
燃料噴射ノズル本体内に嵌入する針弁に、燃料供
給圧によつて開弁方向に移動させる受圧部を設け
て、燃料供給圧が設定圧に達すると、針弁を燃料
噴射孔から引き離すように形成されている。 A fuel injection nozzle used in a conventional internal combustion engine, especially a diesel engine installed in a car, is, for example, as described in Japanese Utility Model Application Publication No. 145665/1983.
The needle valve that fits into the fuel injection nozzle body is provided with a pressure receiving part that is moved in the valve opening direction by the fuel supply pressure, and when the fuel supply pressure reaches a set pressure, the needle valve is pulled away from the fuel injection hole. It is formed.
かかる従来の燃料噴射ノズルは、第１図に示す
ごとく、図示されていない燃料噴射ポンプから圧
送されてきた高圧燃料が、燃料給油穴１内を圧送
されて、針弁３にテーパ状に形成された受圧部４
に導入されると、その給油圧によつて針弁３を持
ち上げ、ブツシユロツド２をスプリング７のばね
力に打ち勝つてリフトしながらノズル８から燃焼
室９内に燃料を噴射するようになつている。 In such a conventional fuel injection nozzle, as shown in FIG. 1, high-pressure fuel is fed under pressure from a fuel injection pump (not shown) through a fuel supply hole 1, and a needle valve 3 is formed into a tapered shape. pressure receiving part 4
When the fuel is introduced into the combustion chamber, the needle valve 3 is lifted by the supplied hydraulic pressure, and the bushing rod 2 is lifted by overcoming the spring force of the spring 7, and fuel is injected from the nozzle 8 into the combustion chamber 9.
しかしながら、現在使用されている高噴射率の
燃料噴射ポンプと組合わせてこの燃料噴射ノズル
を使用した場合、第２図のPNで示すノズル側管
内圧力線図及びＱで示す燃料噴射量線図のごとく
なり、圧力伝播速度が速く、かつ圧力振幅が大き
いため、燃料噴射直後の管内圧力の低下が大き
く、一旦、針弁３が閉じた後、高い燃料給油圧で
再び針弁３がリフトされるため、第２図の１次及
び２次で示すごとく、２回噴射することにより、
ノズル開弁圧力Po″に対し２箇所のピークを有す
る管内圧波形が生じることにより、噴射不安定領
域が発生し、自動車搭載用内燃機関の場合には、
カーノツク領域となる。 However, when this fuel injection nozzle is used in combination with the currently used high-injection-rate fuel injection pump, the nozzle side pipe pressure diagram shown by P N and the fuel injection amount diagram shown by Q in Fig. 2 As the pressure propagation speed is fast and the pressure amplitude is large, the pressure in the pipe immediately after fuel injection decreases greatly, and after the needle valve 3 closes, it is lifted again by high fuel supply oil pressure. In order to
An injection instability region occurs due to the occurrence of a pipe pressure waveform with two peaks relative to the nozzle opening pressure Po'', and in the case of an internal combustion engine installed in an automobile,
It becomes Karnotsk area.
近年、自動車搭載用内燃機関の排気量アツプの
傾向に伴い、燃料噴射ポンプの噴射率がますます
高められてきており、上記のごとき噴射の不安
定、特に不整噴射が生じ、カーノツクが発生する
という問題がある。 In recent years, as the displacement of internal combustion engines installed in automobiles has increased, the injection rate of fuel injection pumps has been increasingly increased, resulting in unstable injection as described above, especially irregular injection, and car knocking. There's a problem.
なお前記公報の考案は、燃料噴射ノズル内にノ
ズル先端部を冷却する冷却管を設け、該冷却管が
燃料供給通路と平行する部分に断熱材を挿入し、
該平行する部分の冷却用油によつて燃料が冷却さ
れ、低質燃料油を使用した場合に燃料温度が低下
して燃料供給通路内圧を上昇させないようにした
ものである。 The idea in the above publication is to provide a cooling pipe for cooling the nozzle tip in the fuel injection nozzle, insert a heat insulating material in the part where the cooling pipe is parallel to the fuel supply passage,
The fuel is cooled by the cooling oil in the parallel portions, so that when low-quality fuel oil is used, the fuel temperature does not drop and the internal pressure of the fuel supply passage does not increase.
そこで本考案は前記従来の問題点を解消するた
めになされたものであり、特に自動車搭載用内燃
機関の噴射の安定化をはかることにより、カーノ
ツクの発生を防止することを目的としたものであ
る。 Therefore, the present invention was devised to solve the above-mentioned conventional problems, and in particular, aims to prevent the occurrence of car knock by stabilizing the injection of internal combustion engines installed in automobiles. .
以上の目的を達成するための本考案の内燃機関
の燃料噴射ノズルの構成は、針弁と、該針弁を燃
料噴射停止側に付勢するプツシユロツドとのそれ
ぞれに、給油圧によつて針弁をリフトさせる方向
に付勢する受圧部を設け、前記プツシユロツド側
受圧部には、前記針弁側受圧部より燃料給油通路
の上流側から分岐した通路を接続したことを特徴
としている。 The structure of the fuel injection nozzle for an internal combustion engine according to the present invention to achieve the above object includes a needle valve and a push rod that urges the needle valve to stop fuel injection. The present invention is characterized in that a pressure-receiving portion is provided which urges the fuel in a direction to lift the needle valve-side pressure-receiving portion, and a passage branching from the upstream side of the fuel supply passage than the needle valve-side pressure-receiving portion is connected to the push rod side pressure-receiving portion.
前記プツシユロツドは、従来のように針弁と一
体に設けてもよく、また別体としてそれぞれの受
圧部によつて動作するようにしてもよい。 The push rod may be provided integrally with the needle valve as in the prior art, or may be operated as a separate body by its respective pressure receiving portion.
以下、図面を参照して本考案の一実施例を説明
するが、第３図は本考案の実施例における内燃機
関の燃料噴射ノズルの要部縦断面図であり、第１
図の従来例とほぼ同様の構成及び機能を有するも
ので、同じ部品は同じ部品番号で示している。 Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG.
It has almost the same structure and function as the conventional example shown in the figure, and the same parts are indicated by the same part numbers.
そこで、本実施例では、針弁３に連動して上下
動するプツシユロツド２の上部にも、燃料給油穴
１から圧送される給油圧を受ける受圧部５を設け
ており、この受圧部５は、従来と同様に針弁３に
設けられている受圧部４よりもその面積を大きく
している。 Therefore, in this embodiment, a pressure receiving part 5 is provided at the upper part of the push rod 2 which moves up and down in conjunction with the needle valve 3, and receives the supply oil pressure fed from the fuel supply hole 1. Its area is made larger than that of the pressure receiving part 4 provided in the needle valve 3 as in the conventional case.
上記の構成からなる本考案の燃料噴射ノズルで
は、燃料給油穴１から圧送された給油圧を、まず
受圧部５で受け、スプリング７のばね力に打ち勝
つと、プツシユロツド２がリフトされ、その直後
に針弁３もその受圧部４によりリフトされる。 In the fuel injection nozzle of the present invention having the above-mentioned configuration, the pressure receiving part 5 first receives the hydraulic pressure fed from the fuel supply hole 1, and when it overcomes the spring force of the spring 7, the push rod 2 is lifted. The needle valve 3 is also lifted by the pressure receiving part 4.
従つて、開閉直後の針弁３は従来のものよりそ
の動きが速くなり、開弁直後の燃料噴射量Ｑも従
来のものより多くなる。 Therefore, the movement of the needle valve 3 immediately after opening and closing becomes faster than that of the conventional valve, and the fuel injection amount Q immediately after the valve is opened also becomes larger than that of the conventional valve.
また、プツシユロツド２自体もリフトされてい
るため、ノズル側管内圧PNの変化に対しても鈍
感である。 Further, since the push rod 2 itself is lifted, it is also insensitive to changes in the nozzle side pipe internal pressure P N.
その結果、第４図に示すノズル側管内圧PN及
び燃料噴射量Ｑの各線図のごとく、燃料噴射波形
が安定し、カーノツク対策が可能になる。 As a result, the fuel injection waveform becomes stable, as shown in the graphs of the nozzle side pipe internal pressure P N and the fuel injection amount Q shown in FIG. 4, and it becomes possible to take measures against car knock.
なお、この燃料噴射ノズル内における戻り燃料
は、プツシユロツド２に設けた燃料リークオフ穴
６を通して上方にリークオフさせるようにしてい
る。 The return fuel in this fuel injection nozzle is leaked upward through a fuel leak-off hole 6 provided in the push rod 2.
また、上記実施例ではプツシユロツド２に設け
た受圧部５を１個設けているが、１個以上の複数
個設けることもでき、またこの受圧部５の位置と
しては、上記燃料リークオフ穴６よりも上部に設
けることがより好ましい。 Further, in the above embodiment, one pressure receiving part 5 is provided on the push rod 2, but one or more pressure receiving parts 5 may be provided. It is more preferable to provide it at the top.
以上説明したように本考案の本考案の内燃機関
の燃料噴射ノズルは、針弁と、該針弁を燃料噴射
停止側に付勢するプツシユロツドとのそれぞれ
に、給油圧によつて針弁をリフトさせる方向に付
勢する受圧部を設け、前記プツシユロツド側受圧
部には、前記針弁側受圧部より燃料給油通路の上
流側から分岐した通路を接続した構成としたの
で、次の効果を得ることができる。 As explained above, the fuel injection nozzle for an internal combustion engine according to the present invention has a needle valve and a push rod that biases the needle valve toward the stop side of fuel injection. A pressure-receiving portion is provided which urges the fuel in the direction of the needle valve, and the push rod-side pressure-receiving portion is connected to a passage branching from the upstream side of the fuel supply passage from the needle-valve side pressure-receiving portion, so that the following effects can be obtained. Can be done.
即ち、前記プツシユロツドに設けた受圧部は、
給油圧が高くなると、まず針弁の受圧部より上流
側の給油圧を受けて、プツシユロツドにリフト力
を発生させ、その直後に針弁の受圧部に給油圧が
達する。したがつて針弁のリフト動作は迅速にな
り、開弁動作が改善される。また閉弁の際は、燃
料噴射で針弁の受圧部付近の燃料圧が急激に低下
してもプツシユロツドの受圧部の圧力低下は前記
より小さいので、全体のリフト力の低下は小さく
針弁の急激な閉止が防止されるので、２次噴射に
よるカーノツクを防止することができる。 That is, the pressure receiving part provided on the push rod is
When the supply oil pressure becomes high, the supply oil pressure is first received upstream from the pressure receiving part of the needle valve to generate a lifting force on the push rod, and immediately after that, the supply oil pressure reaches the pressure receiving part of the needle valve. Therefore, the lifting action of the needle valve becomes faster and the valve opening action is improved. In addition, when closing the valve, even if the fuel pressure near the pressure receiving part of the needle valve suddenly drops due to fuel injection, the pressure drop in the pressure receiving part of the push rod is smaller than the above, so the overall lift force decreases small and the pressure of the needle valve decreases rapidly. Since sudden closing is prevented, car knocking due to secondary injection can be prevented.
従つて、本考案の燃料噴射ノズルを適用した内
燃機関では、燃料噴射の安定化によるカーノツク
を防止することができ、その内燃機関の性能を向
上させると共に、その機能をアツプさせることが
できる。 Therefore, in an internal combustion engine to which the fuel injection nozzle of the present invention is applied, it is possible to prevent car knock due to stabilization of fuel injection, improve the performance of the internal combustion engine, and enhance its functionality.
特に本考案は、自動車搭載用のデイーゼル機関
に対して有効に適用することができる。 In particular, the present invention can be effectively applied to diesel engines installed in automobiles.
第１図は従来の燃料噴射ノズルの要部縦断面
図、第２図は第１図の燃料噴射ノズルにおけるノ
ズル側管内圧力線図及び燃料噴射量線図を示して
おり、第３図は本考案の実施例における燃料噴射
ノズルの要部縦断面図、第４図は第３図の燃料噴
射ノズルにおけるノズル側管内圧力線図及び燃料
噴射量線図を示している。
１……燃料給油穴、２……プツシユロツド、３
……針弁、４，５……受圧部、８……ノズル。
Figure 1 is a vertical cross-sectional view of the main part of a conventional fuel injection nozzle, Figure 2 is a nozzle-side pipe internal pressure diagram and fuel injection amount diagram of the fuel injection nozzle in Figure 1, and Figure 3 is a diagram of the main part of the fuel injection nozzle. FIG. 4 is a vertical cross-sectional view of a main part of a fuel injection nozzle according to an embodiment of the invention, and shows a nozzle-side pipe internal pressure diagram and a fuel injection amount diagram in the fuel injection nozzle of FIG. 3. 1...Fuel fill hole, 2...Push rod, 3
... Needle valve, 4, 5 ... Pressure receiving part, 8 ... Nozzle.
Claims (1)
ツシユロツドとのそれぞれに、給油圧によつて針
弁をリフトさせる方向に付勢する受圧部を設け、
前記プツシユロツド側受圧部には、前記針弁側受
圧部より燃料給油通路の上流側から分岐した通路
を接続した内燃機関の燃料噴射ノズル。 Each of the needle valve and the push rod that biases the needle valve toward the fuel injection stop side is provided with a pressure receiving portion that biases the needle valve in a direction to lift by supply oil pressure,
A fuel injection nozzle for an internal combustion engine, in which a passage branching from an upstream side of a fuel supply passage from the needle valve side pressure receiving part is connected to the push rod side pressure receiving part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16530482U JPS5968185U (en) | 1982-10-30 | 1982-10-30 | Internal combustion engine fuel injection nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16530482U JPS5968185U (en) | 1982-10-30 | 1982-10-30 | Internal combustion engine fuel injection nozzle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5968185U JPS5968185U (en) | 1984-05-09 |
| JPH0245505Y2 true JPH0245505Y2 (en) | 1990-12-03 |
Family
ID=30362191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16530482U Granted JPS5968185U (en) | 1982-10-30 | 1982-10-30 | Internal combustion engine fuel injection nozzle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5968185U (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56145665U (en) * | 1980-04-02 | 1981-11-02 |
-
1982
- 1982-10-30 JP JP16530482U patent/JPS5968185U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5968185U (en) | 1984-05-09 |
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