JPS6233103Y2 - - Google Patents

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Publication number
JPS6233103Y2
JPS6233103Y2 JP9314679U JP9314679U JPS6233103Y2 JP S6233103 Y2 JPS6233103 Y2 JP S6233103Y2 JP 9314679 U JP9314679 U JP 9314679U JP 9314679 U JP9314679 U JP 9314679U JP S6233103 Y2 JPS6233103 Y2 JP S6233103Y2
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JP
Japan
Prior art keywords
nozzle
combustion chamber
fuel injection
injection valve
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
Application number
JP9314679U
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Japanese (ja)
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JPS5611368U (en
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Priority to JP9314679U priority Critical patent/JPS6233103Y2/ja
Publication of JPS5611368U publication Critical patent/JPS5611368U/ja
Application granted granted Critical
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Expired legal-status Critical Current

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Description

【考案の詳細な説明】 〔産業上の利用分野および考案の背景〕 本考案は、デイーゼル機関に用いるホールノズ
ル形燃料噴射弁の過熱防止装置に関し、特に、該
ノズルを可及的に小径ならしめて、直接噴射式燃
焼性能を向上させようとするものである。
[Detailed description of the invention] [Industrial field of application and background of the invention] The present invention relates to an overheating prevention device for a hole nozzle fuel injection valve used in a diesel engine, and in particular, to a device for preventing overheating of a hole nozzle type fuel injection valve used in a diesel engine. , which aims to improve direct injection combustion performance.

周知のごとく、デイーゼル機関の燃焼室では、
噴霧が完全であること、噴霧が均等に分布される
こと、および、噴霧の到達距離が適当であるこ
と、が燃焼に必要な条件とされている。このう
ち、後2者の条件は噴口の位置等が大きく影響す
る。例えば、直接噴射式燃焼室の場合、燃料が油
粒のままで、多量にピストンに衝突すると、油粒
がピストンから蒸発熱をうばうため、そこの温度
が低下して油が付着し、黒いカーボンの堆積を形
成する。そして、正常噴霧の運転時にはピストン
頂面にカーボンの堆積はなく、噴霧の衝突した灰
色のあとが存在する程度であつて、かかる状態に
あつては燃料消費率が少ないと、経験則上いわれ
ている。したがつて、燃料噴射弁のノズル、殊に
噴口の位置が燃焼性能、例えば燃料消費率や出力
に大きく影響する。
As is well known, in the combustion chamber of a diesel engine,
The conditions necessary for combustion are completeness of the spray, uniform distribution of the spray, and appropriate distance of the spray. Of these, the latter two conditions are greatly influenced by the position of the nozzle, etc. For example, in the case of a direct injection combustion chamber, if the fuel is still oil droplets and hits the piston in large quantities, the oil droplets will absorb the heat of evaporation from the piston, causing the temperature to drop and the oil to adhere, causing black carbon to form. Forms a deposit of During normal spray operation, there is no carbon buildup on the top surface of the piston, only a gray mark from the impact of the spray, and it is said from experience that under such conditions the fuel consumption rate is low. There is. Therefore, the position of the nozzle, especially the nozzle, of the fuel injection valve has a large effect on combustion performance, such as fuel consumption rate and output.

他方、周知のごとく、かかる直接噴射式燃焼室
に用いる燃料噴射弁の取付位置は、シリンダの中
心上に位置させることにより、燃焼室の中心で燃
料の噴霧が行われ、その結果、前記のごとく、噴
霧が均等に分布する条件を満たし、燃焼性能が向
上する。そのため、最近の機関では、燃料噴射弁
をシリンダの中心上に位置させるべく設計努力を
行つているものの、かかる中心位置近傍では、
吸・排気弁が必然的に存在し、その弁間のゆとり
もない構造上の制約がある。したがつて、燃料噴
射弁は中心位置に装着しようとするとともに、燃
料噴射弁のノズル径を可及的に小さくしようとす
る要請がある。
On the other hand, as is well known, the installation position of the fuel injector used in such a direct injection combustion chamber is located above the center of the cylinder, so that the fuel is sprayed at the center of the combustion chamber, and as a result, as mentioned above, , satisfies the conditions for even spray distribution and improves combustion performance. Therefore, in modern engines, although efforts are being made to position the fuel injection valve at the center of the cylinder, near the center position,
Intake and exhaust valves are inevitably present, and there are structural constraints with no space between the valves. Therefore, there is a demand to mount the fuel injection valve at a central position and to reduce the nozzle diameter of the fuel injection valve as much as possible.

〔従来の技術とその問題点〕[Conventional technology and its problems]

ところで、一般の高出力機関においては、ノズ
ルのうける熱負荷はきわめて大きい。その結果、
ノズルの溶損、ニードルの固着等が誘発されるの
で、本出願人は、先に、実開昭52−106728号公報
や実開昭53−155918号公報などで、その対策を提
案している。ところが、前者では、殊に同公報の
第4図では銅パツキンが直接シリンダヘツドに接
触しているため、燃焼室等の熱が燃料噴射弁に伝
わる、という問題点がある。
By the way, in a general high-output engine, the heat load on the nozzle is extremely large. the result,
Since melting damage of the nozzle, sticking of the needle, etc. are induced, the applicant has previously proposed countermeasures for this problem in Japanese Utility Model Application No. 52-106728 and Japanese Utility Model Application No. 53-155918. . However, in the former case, especially in FIG. 4 of the same publication, since the copper packing is in direct contact with the cylinder head, there is a problem in that heat from the combustion chamber etc. is transmitted to the fuel injection valve.

また、後者を図示していえば、本願の添付の第
2図示において、ホールノズル形燃料噴射弁Nの
ノズル2に、フランジ4を有する。金属製筒状プ
ロテクタ3を嵌挿し、その先端を絞ることによ
り、ノズル2の先端の噴口を覆わない程度に包
み、該プロテクタ3の外周を更に、フランジ5を
有する変形量大の断熱スリーブ6を嵌挿し、該燃
料噴射弁Nをシリンダヘツド7に穿設した弁挿入
孔8に嵌挿・締付けた装置を提案している。
To illustrate the latter, the nozzle 2 of the hole nozzle type fuel injection valve N has a flange 4 in the second illustration attached to the present application. A metal cylindrical protector 3 is inserted and its tip is squeezed to cover the spout at the tip of the nozzle 2 so as not to cover it, and a heat insulating sleeve 6 with a flange 5 and a large amount of deformation is further wrapped around the outer periphery of the protector 3. The present invention proposes a device in which the fuel injection valve N is fitted into a valve insertion hole 8 formed in the cylinder head 7 and tightened.

しかしながら、かかる提案において、当該燃料
噴射弁Nをシリンダヘツド7に締付・固定した場
合、変形量大の断熱スリーブ6のフランジ5は、
変形量小のプロテクタ3のフランジ4のみの介在
により、断熱スリーブ6のフランジ5厚さを一定
に維持できるよう設計努力はされているものの、
これだけでは充分でなく、しかも、該プロテクタ
3の存在により、シリンダヘツド7に穿設した弁
挿入孔8は、特にノズル挿入孔は大きくなり、小
径の燃料噴射弁Nを採用してそれを燃焼室の中心
に位置させようとする要請には応えられない。加
えて、プロテクタ3を介してノズル2へ熱伝達も
され、防熱効果も低い、という問題点がある。
However, in this proposal, when the fuel injection valve N is tightened and fixed to the cylinder head 7, the flange 5 of the heat insulating sleeve 6, which has a large amount of deformation,
Although design efforts have been made to maintain a constant thickness of the flange 5 of the heat insulating sleeve 6 by interposing only the flange 4 of the protector 3 with a small amount of deformation,
This alone is not enough, and furthermore, due to the presence of the protector 3, the valve insertion hole 8 drilled in the cylinder head 7, especially the nozzle insertion hole, becomes large, and a small-diameter fuel injection valve N is used to insert it into the combustion chamber. We cannot respond to the request to position it at the center of the world. In addition, there is a problem in that heat is also transferred to the nozzle 2 via the protector 3, and the heat insulation effect is low.

〔問題点を解決するための手段〕[Means for solving problems]

そこで本考案は、燃料噴射弁のノズル位置、特
にノズル噴口の位置を機関組立時における噴射弁
締付固定の手作業時に際し一定とさせ、また、ノ
ズルの径も断熱材を含み小径とし、加えて、前記
従来例における不都合をも同時に解消しようとし
て試みたもので、そのため、前記従来例における
プロテクタを止め、該プロテクタのフランジのみ
を残存させ、しかも、断熱スリーブの先端をシリ
ンダヘツドの狭窄部で覆い、その先端を燃焼室に
露呈しないようにした、ホールノズル形燃料噴射
弁過熱防止装置を提供するものである。
Therefore, the present invention has been developed by keeping the nozzle position of the fuel injector, especially the position of the nozzle nozzle, constant during manual tightening and fixing of the injector during engine assembly, and by reducing the diameter of the nozzle to include a heat insulating material. This was an attempt to solve the disadvantages of the conventional example at the same time, and for this reason, the protector in the conventional example was stopped, only the flange of the protector remained, and the tip of the heat insulating sleeve was connected to the narrowed part of the cylinder head. The present invention provides a device for preventing overheating of a hole nozzle type fuel injection valve, which is covered so that its tip is not exposed to the combustion chamber.

以下、本考案の構成を第1図に示す実施例によ
り詳細に説明する。従来例で説明した第2図のも
のと同一部分は同一符号で示し、その説明を省略
する。1はホールノズル形燃料噴射弁Nのノズル
ボデイで、シリンダヘツド7に穿設された弁挿入
孔8に、径方向の隙間9を介して挿入され、図示
しない取付ボルトで、該噴射弁Nをシリンダヘツ
ド7に燃焼室10方向に強固に締付固定する。該
燃焼室10はピストンクラウンに設けられた、ト
ロイダル形燃焼室で、11はノズルボデイ1にボ
デイの一部を構成するリテイニングナツト(また
はケースナツトともいう)の凹凸部で、いわゆる
燃料噴射弁締付凹凸部を示し、ノズル2をノズル
ボデイ1に締付け固定する際の引掛け凹部で、隙
間9より大きな空間を形成している。12は鉄板
からなる変形量小のリング状座金で、その外径は
弁挿入孔8の内径を略等しくしている。6はテフ
ロン(商標名)よりなる断熱材で構成した断熱ス
リーブで、その物性は約200℃で溶損し、変形量
大のものであつて、これをノズル2に嵌挿し、該
ノズル2とノズルボデイ1との境界段部14に当
接可能とすべく、その一方の端にはフランジ5を
設け、他方の端、つまり先端6′はシリンダヘツ
ド7の狭窄部13で絞られ、燃焼室10へ露呈さ
せていない。そして、断熱スリーブ6とフランジ
5とは一体に形成している。
Hereinafter, the configuration of the present invention will be explained in detail with reference to the embodiment shown in FIG. The same parts as those in FIG. 2 explained in the conventional example are indicated by the same reference numerals, and the explanation thereof will be omitted. Reference numeral 1 designates a nozzle body of a hole nozzle type fuel injection valve N, which is inserted into a valve insertion hole 8 formed in a cylinder head 7 through a radial gap 9, and is attached to the cylinder with a mounting bolt (not shown). It is firmly tightened and fixed to the head 7 in the direction of the combustion chamber 10. The combustion chamber 10 is a toroidal combustion chamber provided in the piston crown, and 11 is a concave-convex portion of a retaining nut (also referred to as a case nut) that constitutes a part of the nozzle body 1, and is used to tighten the fuel injection valve. This is a recessed part for tightening and fixing the nozzle 2 to the nozzle body 1, and forms a space larger than the gap 9. Reference numeral 12 denotes a ring-shaped washer made of an iron plate with a small amount of deformation, and its outer diameter is approximately equal to the inner diameter of the valve insertion hole 8. Reference numeral 6 denotes a heat insulating sleeve made of a heat insulating material made of Teflon (trade name), which melts away at about 200 degrees Celsius and has a large amount of deformation. A flange 5 is provided at one end so that it can come into contact with the boundary step 14 between the cylinder head 7 and the cylinder head 7, and the other end, that is, the tip 6' is constricted by the narrowed part 13 of the cylinder head 7, and flows into the combustion chamber 10. Not exposed. The heat insulating sleeve 6 and the flange 5 are integrally formed.

本実施例は叙上のごとく構成されているので、
シリンダヘツド7の弁挿入孔8に対し、断熱スリ
ーブ6およびリング状座金12をノズル2にそれ
ぞれ嵌挿した燃料噴射弁Nを、挿入し、燃焼室1
0方向に強固に締付・固定する。この際、断熱ス
リーブ6はテフロンの材料を使つているので、そ
の締付によつて容易に塑性変形し(この締付トル
クは1.5Kgm等通常指定されているが、その締付
トルク以下ですでに断熱スリーブ6は塑性変形す
る)、殊に、断熱用の隙間9や、リテイニングナ
ツト用の凹凸部11を構成しているので、これら
9、11へはみ出ようとし、また、燃焼室10側
へも若干はみ出ようとして、フランジ5の厚さを
縮めることになる。しかしながら本実施例の場
合、リング状座金12とシリンダヘツド7の狭窄
部13にそのはみ出しは阻まれ、当然のことなが
ら、断熱スリーブ6は圧縮して体積を減少できな
いことから、そのフランジ5の厚さは変わらな
い。その結果、第1図中lは変化しないので、ノ
ズル2の噴口から燃焼室10の壁への微妙な到達
距離を変えることはなく、設計値どおりの噴射状
態となる。
Since this embodiment is configured as described above,
A fuel injection valve N, in which a heat insulating sleeve 6 and a ring-shaped washer 12 are fitted into the nozzle 2, is inserted into the valve insertion hole 8 of the cylinder head 7, and the fuel injection valve N is inserted into the combustion chamber 1.
Tighten and fix firmly in the 0 direction. At this time, since the heat insulating sleeve 6 is made of Teflon material, it easily deforms plastically when tightened. (The heat insulating sleeve 6 is plastically deformed), especially since it forms a heat insulating gap 9 and an uneven part 11 for the retaining nut, it tends to protrude into these 9 and 11, and the combustion chamber 10 side The thickness of the flange 5 will be reduced as the flange 5 tends to protrude slightly. However, in the case of this embodiment, the protrusion is prevented by the ring-shaped washer 12 and the narrowed part 13 of the cylinder head 7, and as a matter of course, the heat insulating sleeve 6 cannot be compressed to reduce its volume, so the thickness of the flange 5 is It doesn't change. As a result, since l in FIG. 1 does not change, the delicate reaching distance from the injection port of the nozzle 2 to the wall of the combustion chamber 10 does not change, and the injection state is maintained as designed.

なお、シリンダヘツド7、燃料噴射弁N、その
取付ボルト、更には、断熱スリーブ6などの熱変
形は前記断熱スリーブ6の塑性変形に比べ、実用
上問題とならない程微少であつて、前記lには影
響を与えないものである。
The thermal deformation of the cylinder head 7, the fuel injection valve N, its mounting bolts, and the heat insulating sleeve 6 is so small that it does not pose a practical problem compared to the plastic deformation of the heat insulating sleeve 6. has no effect.

なおまた、シリンダヘツド7に穿設された弁挿
入孔8とノズル2とのスキマは零にはできないの
で、断熱スリーブ6が、このスキマに若干はみ出
すことがあるが、かかるはみ出しによる前記lに
対しての影響は殆どなく、換言すれば、かかるス
キマに比べ、前記隙間9およびリテイニングナツ
ト用の凹凸部11がはるかに大きく、したがつ
て、かかるスキマによる前記lに対する影響は殆
どないものである。
Furthermore, since the gap between the valve insertion hole 8 drilled in the cylinder head 7 and the nozzle 2 cannot be reduced to zero, the heat insulating sleeve 6 may protrude slightly into this gap. In other words, the gap 9 and the concavo-convex portion 11 for the retaining nut are much larger than the gap, and therefore the gap has almost no effect on the l. .

以上を要するに本考案は叙上の構成を採択した
ので、以下の列挙した効果を期待できる。
In summary, since the present invention adopts the configuration described above, the following effects can be expected.

〔考案の効果〕 ノズル2とそれより大径のノズルボデイ1と
の境界段部14に当接するように、および、ノ
ズル2の一部を囲繞するように成形された、変
形量大の断熱スリーブ6を介存し、その状態で
燃料噴射弁Nをシリンダヘツド7に強固に締
付・固定しても、該断熱スリーブ6が、変形量
小のリング状座金12とシリンダヘツド7の狭
窄部13で囲まれているので、塑性変形は不可
となり、断熱用の隙間9等へははみ出さず、し
たがつて、断熱用スリーブ6のフランジ5の厚
さを縮めない。その結果、ノズル2の噴口位置
が変わらず、燃焼性能を劣化しない。端的に云
つて、第1図示のlが変わらない。
[Effect of the invention] A heat insulating sleeve 6 with a large amount of deformation is formed so as to come into contact with the boundary step 14 between the nozzle 2 and the nozzle body 1 having a larger diameter and to surround a part of the nozzle 2. Even if the fuel injection valve N is firmly tightened and fixed to the cylinder head 7 in this state, the heat insulating sleeve 6 will not deform due to the ring-shaped washer 12 having a small amount of deformation and the narrowed part 13 of the cylinder head 7. Since it is surrounded, plastic deformation is impossible, and it does not protrude into the insulation gap 9, etc., so that the thickness of the flange 5 of the insulation sleeve 6 is not reduced. As a result, the position of the nozzle 2 does not change, and the combustion performance does not deteriorate. Simply put, l shown in the first diagram remains unchanged.

ノズル2は、燃焼室10の反対側でフランジ
5を一体形成した断熱スリーブ6のみで囲繞さ
れているので、その径を小とすることができ、
シリンダヘツド7に構造上の制約があつても、
燃焼室10の中心に臨ますこともでき、直接噴
射式燃焼室10の燃焼性能を向上することに資
するとともに、フランジ5と断熱スリーブ6と
が同材料で作成しているので、より断熱効果が
向上する。
Since the nozzle 2 is surrounded only by the heat insulating sleeve 6 with the flange 5 integrally formed on the opposite side of the combustion chamber 10, its diameter can be made small.
Even if the cylinder head 7 has structural restrictions,
It can also be seen into the center of the combustion chamber 10, contributing to improving the combustion performance of the direct injection type combustion chamber 10, and since the flange 5 and the heat insulating sleeve 6 are made of the same material, the heat insulating effect is further improved. improves.

単なるリング状座金12であるため、安価に
製作することができ、断熱スリーブ6も燃焼室
10に露呈しないので、溶損することがなく長
持ちする。
Since it is a simple ring-shaped washer 12, it can be manufactured at low cost, and since the heat insulating sleeve 6 is not exposed to the combustion chamber 10, it will not melt and be damaged and will last a long time.

実開昭53−155918号公報で示すプロテクタの
存在がないので、防熱効果が大きい。
Since there is no protector as shown in Japanese Utility Model Application Publication No. 53-155918, the heat insulation effect is great.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本考案の実施例の断面図、第2図は従
来例の断面図を示す。 1……ノズルボデイ、2……ノズル、5……フ
ランジ、6……断熱スリーブ、7……シリンダヘ
ツド、8……弁挿入孔、9……隙間、10……ト
ロイダル形燃焼室、12……リング状座金、13
……狭窄部、14……境界段部、N……燃料噴射
弁。
FIG. 1 shows a sectional view of an embodiment of the present invention, and FIG. 2 shows a sectional view of a conventional example. 1... Nozzle body, 2... Nozzle, 5... Flange, 6... Insulating sleeve, 7... Cylinder head, 8... Valve insertion hole, 9... Gap, 10... Toroidal combustion chamber, 12... Ring-shaped washer, 13
...Narrowing portion, 14...Boundary stage portion, N...Fuel injection valve.

Claims (1)

【実用新案登録請求の範囲】 デイーゼル機関の直接噴射式燃焼室10に用い
る燃料噴射弁Nであつて、シリンダヘツド7に穿
設し、かつ、下端にリテイニングナツト用の凹凸
部11を備えたノズルボデイ1との間に径方向の
隙間9を有する弁挿入孔8に挿入したホールノズ
ル形燃料噴射弁Nのノズル2と、それより大径の
ノズルボデイ1と、の境界段部14において、 該ノズル2の外周を囲繞し、かつ、前記境界段
部14の側にフランジ5を一体に形成した変形最
大の断熱スリーブ6を該ノズル2に嵌挿し、該断
熱スリーブ6の燃焼室10側の先端6′をシリン
ダヘツド7の狭窄部13で絞り、燃焼室10へは
露呈しないよう構成し、 該フランジ5と前記境界段部14の環状部との
間に、前記弁挿入孔8と外径が略同径の変形量小
のリング状座金12を介在させ、 前記ホールノズル形燃料噴射弁Nを燃焼室10
側へ締付け固定する燃料噴射弁加熱防止装置。
[Claims for Utility Model Registration] A fuel injection valve N used in a direct injection type combustion chamber 10 of a diesel engine, which is bored in the cylinder head 7 and provided with an uneven portion 11 for a retaining nut at the lower end. At the boundary step 14 between the nozzle 2 of the hole nozzle type fuel injection valve N inserted into the valve insertion hole 8 having a radial gap 9 between the nozzle body 1 and the nozzle body 1 having a larger diameter, the nozzle A heat insulating sleeve 6 with maximum deformation that surrounds the outer periphery of the nozzle 2 and has a flange 5 integrally formed on the side of the boundary step 14 is inserted into the nozzle 2, and the tip 6 of the heat insulating sleeve 6 on the side of the combustion chamber 10 is inserted into the nozzle 2. ' is constricted by the narrowed part 13 of the cylinder head 7 so as not to be exposed to the combustion chamber 10, and between the flange 5 and the annular part of the boundary step part 14, the valve insertion hole 8 and the outer diameter are approximately equal to each other. A ring-shaped washer 12 having the same diameter and a small amount of deformation is interposed to connect the hole nozzle type fuel injection valve N to the combustion chamber 10.
A fuel injection valve heating prevention device that is tightened and fixed to the side.
JP9314679U 1979-07-06 1979-07-06 Expired JPS6233103Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9314679U JPS6233103Y2 (en) 1979-07-06 1979-07-06

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9314679U JPS6233103Y2 (en) 1979-07-06 1979-07-06

Publications (2)

Publication Number Publication Date
JPS5611368U JPS5611368U (en) 1981-01-30
JPS6233103Y2 true JPS6233103Y2 (en) 1987-08-24

Family

ID=29326078

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9314679U Expired JPS6233103Y2 (en) 1979-07-06 1979-07-06

Country Status (1)

Country Link
JP (1) JPS6233103Y2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5951613U (en) * 1982-09-30 1984-04-05 いすゞ自動車株式会社 Engine mounting structure

Also Published As

Publication number Publication date
JPS5611368U (en) 1981-01-30

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