JPS5842613Y2 - Diesel engine fuel injection nozzle - Google Patents
Diesel engine fuel injection nozzleInfo
- Publication number
- JPS5842613Y2 JPS5842613Y2 JP1977056055U JP5605577U JPS5842613Y2 JP S5842613 Y2 JPS5842613 Y2 JP S5842613Y2 JP 1977056055 U JP1977056055 U JP 1977056055U JP 5605577 U JP5605577 U JP 5605577U JP S5842613 Y2 JPS5842613 Y2 JP S5842613Y2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- fuel injection
- injection nozzle
- cylinder head
- heat insulating
- 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、ディーゼル機関の燃料噴射ノズルに関し、特
に、ノズル温度の低下をはかった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 for a diesel engine, and more particularly to a fuel injection nozzle that reduces nozzle temperature.
従来、ディーゼル機関の燃料噴射ノズルでは、機関の運
転中に、ノズルがシリンダヘッドからの伝熱で、過熱す
ることがないように、例えば、第１図に示すように、断
熱材をノズルとシリンダヘッドとの間に設けていた。Conventionally, in the fuel injection nozzle of a diesel engine, in order to prevent the nozzle from overheating due to heat transfer from the cylinder head while the engine is running, for example, as shown in Figure 1, insulation material is placed between the nozzle and the cylinder. It was placed between the head.
即ち、第１図にむいて、燃料噴射ノズル１は断熱材２を
介してシリンダヘッド５に取付けられていた。That is, as shown in FIG. 1, the fuel injection nozzle 1 is attached to the cylinder head 5 via the heat insulating material 2. As shown in FIG.
したがって、この従来例では、シリンダヘッド５からノ
ズル１に伝わる熱は、断熱材２により遮断されるが、ノ
ズルの先端部は高温部（燃焼室）に露出しているから、
ここから流入する熱量により、ノズルは加熱されること
になり、ノズル温度を低温に保つことはむつかしい。Therefore, in this conventional example, the heat transmitted from the cylinder head 5 to the nozzle 1 is blocked by the heat insulating material 2, but since the tip of the nozzle is exposed to the high temperature part (combustion chamber),
The nozzle is heated by the amount of heat flowing in from here, and it is difficult to maintain the nozzle temperature at a low temperature.
この点を考慮して、ノズルの先端をノズルカバーで覆っ
たものもあるが、それはノズルカバーとノズルの先端と
が密着しているため、熱は、ノズルカバーを介してノズ
ル先端に伝わり、この例に督いても充分な断熱効果は得
られない。Taking this into consideration, there are some models that cover the tip of the nozzle with a nozzle cover, but since the nozzle cover and the tip of the nozzle are in close contact with each other, heat is transferred to the nozzle tip via the nozzle cover. Even if you do this, you will not be able to obtain a sufficient heat insulation effect.
本考案は、このような従来例の欠点を解消し、充分な断
熱効果をもつ燃料噴射ノズルの提供を目的とするもので
ある。The present invention aims to eliminate such drawbacks of the conventional example and provide a fuel injection nozzle having sufficient heat insulation effect.
この目的を達成するために、本考案は、燃料噴射ノズル
の上部外周に該ノズルを囲繞する断熱材を設けるととも
に、熱伝導性の良好な材料からなるノズルカバーを、そ
の下部がノズルの先端部の燃焼室対向面を間隙をあけて
覆い、かつその上部側へ続く外周面がシリンダヘッドに
接触するとともに、更にその上部が前記断熱材とシリン
ダヘッドとの間に挾着されるように設けたものである。In order to achieve this objective, the present invention provides a heat insulating material surrounding the upper outer periphery of the fuel injection nozzle, and a nozzle cover made of a material with good thermal conductivity, the lower part of which covers the tip of the nozzle. It covers the facing surface of the combustion chamber with a gap, and the outer circumferential surface continuing to the upper side contacts the cylinder head, and the upper part is provided so as to be clamped between the heat insulating material and the cylinder head. It is something.
次に、本考案の実施例を第２図により説明する。Next, an embodiment of the present invention will be explained with reference to FIG.
第２図にも・いて、ノズル１の先端部にはノズルカバー
３が、該先端部と少許の間隙（０，１〜０．３ｍｍ）４
をあけて、取付けられている。As shown in FIG. 2, a nozzle cover 3 is placed at the tip of the nozzle 1 with a small gap (0.1 to 0.3 mm) 4 between the tip and the tip.
It is installed by opening it.
該ノズルカバー３は、銅のような熱伝導性の良好な材料
から作られ、ノズル先端の高温部への露出面積をできる
だけ小さくするような形状・寸法のものであり、その上
部側へ続く外周面はシリンダヘッド５に密着状に接触固
定されている。The nozzle cover 3 is made of a material with good thermal conductivity, such as copper, and has a shape and dimensions that minimize the exposed area of the nozzle tip to the high temperature part, and has an outer periphery that continues to the upper side. The surface is fixed in close contact with the cylinder head 5.
２は断熱材で、ノズルカバー３の上半部とノズル１との
間に、該ノズル１の上部外周を囲繞するように設けられ
ている。A heat insulating material 2 is provided between the upper half of the nozzle cover 3 and the nozzle 1 so as to surround the upper outer periphery of the nozzle 1.
機関の運転によりノズル１とノズルカバー３との間の少
許の間隙４内には、燃焼室で発生したカーボンが侵入し
堆積する。As the engine operates, carbon generated in the combustion chamber enters and accumulates in the small gap 4 between the nozzle 1 and the nozzle cover 3.
このカーボンは断熱効果を有するものであるからノズル
カバー３に伝わった熱は、カーボンによって、ノズル１
に伝わるのを防止される。Since this carbon has a heat insulating effect, the heat transmitted to the nozzle cover 3 is transferred to the nozzle 1 by the carbon.
will be prevented from being transmitted.
そして、ノズルカバー３は伝熱良好な材料で作られてお
り、かつその上部側へ続く下半部の外周面がシリンダヘ
ッド５に接触しているので、ノズルカバー３に伝わった
熱は、すみやかに、シリンダヘッド５に放散されること
になる。Since the nozzle cover 3 is made of a material with good heat transfer, and the outer peripheral surface of the lower half extending to the upper side is in contact with the cylinder head 5, the heat transferred to the nozzle cover 3 is quickly transferred. Then, it is dissipated into the cylinder head 5.
しかも、このノズルカバー３は、その上半部が断熱材２
とシリンダヘッド５との間に挾着されているので、ノズ
ルカバー３に伝わった熱は、断熱材２で遮断されてノズ
ル１に伝わることがなく、シリンダヘッド５へ効率よく
放散される。Moreover, this nozzle cover 3 has a heat insulating material 2 in its upper half.
Since the nozzle cover 3 is clamped between the nozzle cover 3 and the nozzle head 5, the heat transmitted to the nozzle cover 3 is blocked by the heat insulating material 2 and is not transmitted to the nozzle 1, and is efficiently radiated to the cylinder head 5.
なお、前記カーボンの堆積による断熱効果は、５時間程
度の機関運転により得られることが実験により証明され
ている。It has been experimentally proven that the heat insulating effect due to carbon deposition can be obtained by operating the engine for about 5 hours.
第３図にその実験例を示す。Figure 3 shows an example of the experiment.
第３図にち・いて、曲線ａは断熱材２だけの場合（第１
図参照）、曲線すと曲線Ｃは断熱材２とともにノズルカ
バー３を設けたが間隙４をあけなかった場合、および曲
線ｄは断熱材２とともにノズルカバー３を設け、かつ間
隙４をあけた場合（本考案の構成）の結果を、それぞれ
示しでいる。In Figure 3, curve a is for the case where only insulation material 2 is used (first
(see figure), curve C shows the case where the nozzle cover 3 is provided with the heat insulating material 2 but no gap 4 is provided, and curve d shows the case where the nozzle cover 3 is provided with the heat insulating material 2 and the gap 4 is provided. The results of (configuration of the present invention) are shown respectively.
これにより明らかな如く、機関の４〜５時間の運転によ
り、燃料ノズルのシート部の温度は１０〜１５℃低下し
て上記間隙にカーボンが堆積し、これが断熱効果を奏す
ることが判る。As is clear from this, after 4 to 5 hours of engine operation, the temperature of the seat portion of the fuel nozzle drops by 10 to 15°C, and carbon is deposited in the gap, which has a heat insulating effect.
このように、本考案によれば、燃料噴射ノズルルの上部
外周に該ノズルを囲繞する断熱材を設けるとともに、熱
伝導性の良好な材料からなるノズルカバーを、その下部
がノズルの先端部の燃焼室対向面を間隙をあけて覆い、
かつその上部側へ続く外周面がシリンダヘッドに接触す
るとともに、更にその上部が前記断熱材とシリンダヘッ
ドとの間に挾着されるように設けたので、ノズルカバー
によりノズルの先端部が高温部に露出する部分を極力小
さくしてノズル先端部の異常高温を防止しうるとともに
、ノズルカバーに伝わった熱がノズルに伝わるのを、カ
ーボンと断熱材とにより防止することができる。As described above, according to the present invention, a heat insulating material is provided around the upper outer periphery of the fuel injection nozzle, and a nozzle cover made of a material with good thermal conductivity is provided, and the lower part of the nozzle covers the combustion chamber at the tip of the nozzle. Cover the surface facing the chamber with a gap,
In addition, the outer circumferential surface continuing to the upper side contacts the cylinder head, and the upper part is provided so as to be clamped between the heat insulating material and the cylinder head, so the nozzle cover prevents the tip of the nozzle from being a hot part. It is possible to prevent the tip of the nozzle from becoming abnormally high temperature by minimizing the portion exposed to the nozzle, and the carbon and the heat insulating material can prevent the heat transmitted to the nozzle cover from being transmitted to the nozzle.
しかも、ノズルカバーを、熱伝導性良好な材料で構威し
、かつその下半部、上半部ともシリンダヘッドに接触す
るように設けたので、ノズルカバーに伝わった熱を、直
ちにかつ効率よくシリンダヘッドに放散させることがで
きる。Moreover, since the nozzle cover is made of a material with good thermal conductivity and is provided so that both the lower and upper halves are in contact with the cylinder head, the heat transferred to the nozzle cover can be quickly and efficiently dissipated. It can be dissipated into the cylinder head.
従って、ノズルの放熱、断熱効果が著しく良好となり、
第１図に示したような、断熱材のみのもの（第２図の曲
線ａ）に比べて、ノズル温度を通常の機関運転下におい
て、約３０℃低下させることができ、またノズルカバー
をノズルに密着したもの（第２図の曲線６１曲線Ｃ）に
比べて、約１０℃低下させることができ、特に燃焼温度
の高い直噴式ディーゼル機関に適用するときには、燃焼
噴射ノズルの高温化を効果的に防止でき、顕著な作用・
効果を奏するものである。Therefore, the heat dissipation and insulation effects of the nozzle are significantly improved.
As shown in Figure 1, the nozzle temperature can be lowered by approximately 30°C under normal engine operation compared to the case where only the insulation material is used (curve a in Figure 2). The temperature can be lowered by about 10℃ compared to the one that closely adheres to the engine (curve 61 curve C in Figure 2). Especially when applied to direct-injection diesel engines with high combustion temperatures, it is possible to effectively reduce the temperature of the combustion injection nozzle. can be prevented, with remarkable effects and
It is effective.
第１図は従来のノズルの断面側面図、第２図は本考案の
実施例の断面側面図第３図は本考案の効果を示す実施例
のグラフで、縦軸にはノズルシート部の温度ｅＣ）を、
横軸には機関の運転時間（ｈ）をとっている。
１・・・ノズル、２・・・断熱材、３・・・ノズルカバ
ー、４・・・間隙、５・・・シリンダヘッド。Fig. 1 is a cross-sectional side view of a conventional nozzle, Fig. 2 is a cross-sectional side view of an embodiment of the present invention, and Fig. 3 is a graph of an embodiment showing the effects of the present invention. eC),
The horizontal axis shows the operating time (h) of the engine. 1... Nozzle, 2... Insulating material, 3... Nozzle cover, 4... Gap, 5... Cylinder head.
Claims (1)
を設けるとともに、熱伝導性の良好な材料からなるノズ
ルカバーを、その下部がノズルの先端部の燃焼室対向面
を間隙をあけて覆い、かつその上部側へ続く外周面がシ
リンダヘッドに接触するとともに、更にその上部が前記
断熱材とシリンダヘッドとの間に挾着されるように設け
たディーゼル機関の燃料噴射ノズル。A heat insulating material is provided around the upper part of the fuel injection nozzle to surround the nozzle, and a nozzle cover made of a material with good thermal conductivity is provided, the lower part of which covers the surface of the tip of the nozzle facing the combustion chamber with a gap therebetween, A fuel injection nozzle for a diesel engine, the outer peripheral surface of which continues to the upper side contacts the cylinder head, and the upper part of the fuel injection nozzle is clamped between the heat insulating material and the cylinder head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1977056055U JPS5842613Y2 (en) | 1977-04-30 | 1977-04-30 | Diesel engine fuel injection nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1977056055U JPS5842613Y2 (en) | 1977-04-30 | 1977-04-30 | Diesel engine fuel injection nozzle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS53150323U JPS53150323U (en) | 1978-11-27 |
| JPS5842613Y2 true JPS5842613Y2 (en) | 1983-09-27 |
Family
ID=28952533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1977056055U Expired JPS5842613Y2 (en) | 1977-04-30 | 1977-04-30 | Diesel engine fuel injection nozzle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5842613Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3147015A1 (en) * | 1981-11-27 | 1983-06-01 | M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8500 Nürnberg | AIR-COMPRESSING, DIRECT-INJECTING ENGINE |
-
1977
- 1977-04-30 JP JP1977056055U patent/JPS5842613Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS53150323U (en) | 1978-11-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS6120277Y2 (en) | ||
| JPH0585750B2 (en) | ||
| JPS5842613Y2 (en) | Diesel engine fuel injection nozzle | |
| US2840427A (en) | Piston | |
| JPH0515577Y2 (en) | ||
| JPS6019955Y2 (en) | Pre-chamber of internal combustion engine | |
| JP4285621B2 (en) | Mounting structure of fuel injection valve | |
| JPS6040840Y2 (en) | Internal combustion engine cylinder liner cooling system | |
| JPH0240257Y2 (en) | ||
| JPS5933842Y2 (en) | Internal combustion engine exhaust pulp sheet | |
| JPH0130581Y2 (en) | ||
| JPH0248678Y2 (en) | ||
| JPS603333Y2 (en) | Engine intake air heating device | |
| JPH0724627Y2 (en) | Glow plug cover | |
| JPS62298658A (en) | Fuel injection nozzle | |
| JPS591103Y2 (en) | Diesel engine cylinder head | |
| JPH0115861Y2 (en) | ||
| JPS5870038A (en) | Piston of internal-combustion engine | |
| JP2004092620A (en) | Cylinder head of internal combustion engine | |
| JPS608115Y2 (en) | Internal combustion engine piston cooling system | |
| JPH0716038Y2 (en) | engine | |
| JPS597578Y2 (en) | Diesel engine fuel injection nozzle overheating prevention device | |
| JPS6233064Y2 (en) | ||
| JPS6224039Y2 (en) | ||
| JPS59115860U (en) | Nozzle heat shield in pre-chamber diesel engine |