JPH0491362A - Nozzle tip part heat preventing device for fuel injection nozzle of diesel engine - Google Patents
Nozzle tip part heat preventing device for fuel injection nozzle of diesel engineInfo
- Publication number
- JPH0491362A JPH0491362A JP20430290A JP20430290A JPH0491362A JP H0491362 A JPH0491362 A JP H0491362A JP 20430290 A JP20430290 A JP 20430290A JP 20430290 A JP20430290 A JP 20430290A JP H0491362 A JPH0491362 A JP H0491362A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- insertion hole
- cap
- fuel injection
- tapered surface
- 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
- 239000000446 fuel Substances 0.000 title claims abstract description 26
- 238000002347 injection Methods 0.000 title claims abstract description 20
- 239000007924 injection Substances 0.000 title claims abstract description 20
- 238000003780 insertion Methods 0.000 claims abstract description 40
- 230000037431 insertion Effects 0.000 claims abstract description 40
- 230000002093 peripheral effect Effects 0.000 claims abstract description 30
- 238000002485 combustion reaction Methods 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims description 17
- 238000009413 insulation Methods 0.000 claims description 10
- 238000012856 packing Methods 0.000 description 5
- 239000000567 combustion gas Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000004520 agglutination Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000004047 hole gas Substances 0.000 description 1
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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
-
- 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
- F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
- F02M53/04—Injectors with heating, cooling, or thermally-insulating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
請求項１に記載の発明（以下、「第１発明」という）及
び請求項２に記載の発明（以下、「第２発明」という）
は、いずれもディーゼルエンジンの燃料噴射ノズルのノ
ズル先端部防熱装置に関する。Detailed Description of the Invention [Industrial Field of Application] The invention according to claim 1 (hereinafter referred to as the "first invention") and the invention according to claim 2 (hereinafter referred to as the "second invention")
Both relate to a nozzle tip heat insulation device for a fuel injection nozzle of a diesel engine.
［基本構造コ
本発明の前提となるディーゼルエンジンの燃料噴射ノズ
ルのノズル先端部防熱装置の基本構造は、次のようにな
っている。[Basic Structure] The basic structure of the nozzle tip heat shielding device for the fuel injection nozzle of a diesel engine, which is the premise of the present invention, is as follows.
例えば第１図または第２図に示すように、ディーゼルエ
ンジンのシリンダヘッド１内に燃焼室２に向かうノズル
挿入孔３をあけ、ノズル挿入孔３の燃焼室２寄り側にノ
ズル防熱用キャップ４を内嵌させ、ノズル防熱用キャッ
プ４は、筒状周壁部５の先端部に内向きのシール用フラ
ンジ６を形成するとともに、基端部に外向きの固定用フ
ランジ７を形成して構成し、ノズル挿入孔３には、その
内周面から内側に向かう固定用フランジ受座８を形成し
、ノズル挿入孔３に挿入した燃料噴射ノズル９のノズル
先端部１０をノズル防熱用キャップ４に内嵌させ、燃料
噴射ノズル９の押入力により、ノズルホルダ肩部１１で
固定用フランジ７を固定用フランジ受座８に押圧固定す
るとともに、ノズル先端面１２をシール用フランジ６に
気密状に圧接させて構成したものである。For example, as shown in FIG. 1 or 2, a nozzle insertion hole 3 facing the combustion chamber 2 is formed in the cylinder head 1 of a diesel engine, and a nozzle heat-insulating cap 4 is installed on the side of the nozzle insertion hole 3 closer to the combustion chamber 2. The nozzle heat-insulating cap 4 is configured by forming an inward sealing flange 6 at the tip of the cylindrical peripheral wall 5 and an outward fixing flange 7 at the base end, A fixing flange seat 8 is formed in the nozzle insertion hole 3 and extends inward from its inner peripheral surface, and the nozzle tip 10 of the fuel injection nozzle 9 inserted into the nozzle insertion hole 3 is fitted into the nozzle heat insulation cap 4. Then, by the pushing force of the fuel injection nozzle 9, the fixing flange 7 is pressed and fixed to the fixing flange seat 8 by the nozzle holder shoulder 11, and the nozzle tip surface 12 is brought into airtight contact with the sealing flange 6. It is composed of
この基本構造のものでは、燃焼室２で発生した燃焼熱を
ノズル防熱用キャップで遮熱してノズル先端部１０の被
熱を緩和し、ノズル先端部１０に内設される弁体・弁座
間で生じる燃料成分の熱膠着を防止することができる。With this basic structure, the combustion heat generated in the combustion chamber 2 is insulated by the nozzle heat-insulating cap to reduce the heat exposure of the nozzle tip 10, and between the valve body and valve seat installed inside the nozzle tip 10. It is possible to prevent thermal agglutination of the resulting fuel components.
［従来の技術］
上記基本構造は従来では、実開昭６２−１０１０６４号
公報に開示された技術においても採用されている（第３
図参照）。[Prior art] The above basic structure has conventionally been adopted in the technology disclosed in Utility Model Application Publication No. 62-101064 (No.
(see figure).
この従来技術では、ノズル防熱用キャップ５０の筒状周
壁部５１は単にノズル先端部５２の外周面を覆い、かつ
シール用フランジ５３を支持することのみを目的とした
ものに過ぎず、ノズル先端部５２の外周面に沿って、先
端から基端まで同一径の筒形状に形成されたものであっ
た。In this prior art, the cylindrical peripheral wall portion 51 of the nozzle heat-insulating cap 50 is merely intended to cover the outer circumferential surface of the nozzle tip 52 and to support the sealing flange 53; It was formed into a cylindrical shape with the same diameter from the tip to the base along the outer peripheral surface of the tube.
［発明が解決しようとする課題］ 上記従来技術では、次の問題がある。[Problem to be solved by the invention] The above conventional technology has the following problems.
ノズル先端面５４をシール用フランジ５３に圧接させた
ことによりノズル防熱用キャップ５０に生じる応力は、
シール用フランジ５３の外周縁部のキャップ隅角部５５
に応力し、ここを短期間に損傷させるため、ノズル防熱
用キャップ５０の耐久性を低くする。The stress generated in the nozzle heat-insulating cap 50 by bringing the nozzle tip surface 54 into pressure contact with the sealing flange 53 is as follows:
Cap corner portion 55 at the outer peripheral edge of the sealing flange 53
The durability of the nozzle heat-insulating cap 50 is reduced because stress is applied to the nozzle heat-insulating cap 50 and damages it in a short period of time.
本発明は、キャップ隅角部の損傷を抑制することをその
課題とする。An object of the present invention is to suppress damage to the corners of the cap.
［課題を解決するための手段］
（第１発明）
第１発明は、例えば第１図に示すように、前記基本構造
において、筒状周壁部５に弾性を有する外向膨出湾曲部
１３を周方向に沿って形成し、ノズル挿入孔３の内周面
に燃料室２に向けて漸次に内径を縮める挿入孔内テーパ
面１４を設け、挿入孔内テーパ面１４に外向膨出湾曲部
１３を圧接させたものである。[Means for Solving the Problems] (First Invention) As shown in FIG. A tapered surface 14 in the insertion hole is formed along the direction, and the tapered surface 14 in the insertion hole gradually reduces the inner diameter toward the fuel chamber 2 on the inner circumferential surface of the nozzle insertion hole 3. It is pressed together.
（第２発明）
第２発明は、第２図に示すように、上記第１発明におい
て、前記外向膨出湾曲部１３に代えて、筒状周壁部５に
弾性を有する内向膨出湾曲部１５を周方向に沿って形成
し、前記挿入孔内テーパ面１４に代えて、ノズル先端部
１０の外周面に燃料室２に向けて漸次に外径を縮めるノ
ズル外周テーパ面１６を設け、ノズル外周テーパ面１６
に内向膨出湾曲部１５を圧接させたものである。(Second Invention) As shown in FIG. 2, a second invention provides an inwardly bulging curved portion 15 having elasticity on the cylindrical peripheral wall portion 5 in place of the outwardly bulging curved portion 13 in the first invention. is formed along the circumferential direction, and instead of the tapered surface 14 in the insertion hole, a nozzle outer circumferential tapered surface 16 is provided on the outer circumferential surface of the nozzle tip 10 that gradually reduces the outer diameter toward the fuel chamber 2. Tapered surface 16
The inwardly bulging curved portion 15 is pressed into contact with the inwardly bulging curved portion 15.
［作用］
（第１発明）
第１発明では、例えば第１図に示すように、ノズル先端
面１２をシール用フランジ６に圧接させたことによりノ
ズル防熱用キャップ４に応力が生じるが、外向膨出湾曲
部１３が挿入孔内テーバ面１４に押されて伸長している
ため、シール用７ランジ６の外周縁部のキャップ隅角部
１７に生じる応力は緩和され、キャップ隅角部１７の損
傷が抑制され、ノズル防熱用キャップ４の耐久性を高く
維持できる。[Operation] (First invention) In the first invention, as shown in FIG. 1, for example, stress is generated in the nozzle heat-insulating cap 4 by bringing the nozzle tip surface 12 into pressure contact with the sealing flange 6. Since the protruding curved portion 13 is pushed and expanded by the tapered surface 14 in the insertion hole, the stress generated in the cap corner 17 at the outer peripheral edge of the sealing 7 flange 6 is relaxed, and the cap corner 17 is not damaged. is suppressed, and the durability of the nozzle heat-insulating cap 4 can be maintained at a high level.
筒状周壁部５の周囲に挿入孔内テーパ面１４による隙間
１８ができ、ここに燃焼ガスが侵入する場合もあるが、
この燃焼ガスは挿入孔内テーパ面１４に接当された外向
膨出湾曲部１３で堰止められるため、ノズルホルダ１９
側には侵入せず、燃料噴射ノズル９が燃焼ガスで腐食す
る懸念はない。A gap 18 is formed around the cylindrical peripheral wall portion 5 by the tapered surface 14 inside the insertion hole, and combustion gas may enter this gap.
Since this combustion gas is dammed by the outwardly bulging curved portion 13 in contact with the tapered surface 14 inside the insertion hole, the nozzle holder 19
There is no fear that the fuel injection nozzle 9 will be corroded by the combustion gas.
（第２発明）
第２発明では、例えば第２図に示すように、ノズル先端
面１２をシール用フランジ６に圧接させたことによりノ
ズル防熱用キャップ４に応力が生じるが、内向膨出湾曲
部１５がノズル外周テーパ面１６に押圧されて伸長して
いるため、シール用フランジ６の外周縁部のキャップ隅
角部１７に生じる応力は緩和され、キャップ隅角部１７
の損傷が抑制され、ノズル防熱用キャップ４の耐久性を
高（維持できる。(Second invention) In the second invention, as shown in FIG. 2, for example, stress is generated in the nozzle heat-insulating cap 4 by bringing the nozzle tip surface 12 into pressure contact with the sealing flange 6, but the inwardly bulging curved portion 15 is pressed against the nozzle outer periphery tapered surface 16 and expands, the stress generated in the cap corner 17 at the outer periphery of the sealing flange 6 is relaxed, and the cap corner 17
damage to the nozzle is suppressed, and the durability of the nozzle heat-insulating cap 4 can be maintained at a high level.
［効果］
（第１発明）
第１発明によれば、ノズル先端面をシール用フランジに
圧接させたことによりノズル防熱用キャップに応力が生
じるが、外向膨出湾曲部が挿入孔内テーパ面に押されて
伸長しているため、シール用フランジの外周縁部のキャ
ップ隅角部に生じる応力は緩和され、キャップ隅角部の
損傷が抑制され、ノズル防熱用キャップの耐久性を高く
維持できる。[Effect] (First invention) According to the first invention, stress is generated in the nozzle heat-insulating cap by pressing the nozzle tip surface against the sealing flange. Since it is pushed and expanded, the stress generated at the corner of the cap at the outer peripheral edge of the sealing flange is alleviated, damage to the corner of the cap is suppressed, and the durability of the nozzle heat-insulating cap can be maintained at a high level.
（第２発明）
第２発明によれば、ノズル先端面をシール用フランジに
圧接させたことによりノズル防熱用キャップに応力が生
じるが、内向膨出湾曲部がノズル外周テーパ面に押圧さ
れて伸長しているため、シール用フランジの外周縁部の
キャップ隅角部に生じる応力は緩和され、キャップ隅角
部の損傷が抑制され、ノズル防熱用キャップの耐久性を
高く維持＝７−
できる。(Second invention) According to the second invention, stress is generated in the nozzle heat-insulating cap by pressing the nozzle tip surface against the sealing flange, but the inwardly bulging curved portion is pressed against the nozzle outer peripheral tapered surface and expands. Therefore, the stress generated at the corner of the cap at the outer peripheral edge of the sealing flange is alleviated, damage to the corner of the cap is suppressed, and the durability of the nozzle heat-insulating cap can be maintained at a high level.
［実施例］ 本発明の実施例を図面に基づいて説明する。[Example] Embodiments of the present invention will be described based on the drawings.
第１図に示す第１実施例は、うず室式ディーゼルエンジ
ンのシリンダヘッド１内にうず室式燃焼室２に向かうノ
ズル挿入孔３をあけ、ノズル挿入孔３の燃焼室２寄り側
にノズル防熱用キャップ４を内嵌させ、ノズル挿入孔３
に燃料噴射ノズル９を挿入して構成しである。In the first embodiment shown in FIG. 1, a nozzle insertion hole 3 facing a whirlpool combustion chamber 2 is formed in a cylinder head 1 of a whirlpool diesel engine, and a nozzle heat shield is installed on the side of the nozzle insertion hole 3 closer to the combustion chamber 2. Insert the cap 4 into the nozzle insertion hole 3.
The fuel injection nozzle 9 is inserted into the fuel injection nozzle.
燃料噴射ノズル９は、ノズルホルダ１９の先端に弁体２
０を備えた小径のノズル先端部ＩＯを突出させて構成し
である。The fuel injection nozzle 9 has a valve body 2 at the tip of the nozzle holder 19.
It is constructed by protruding a small diameter nozzle tip IO having a diameter of 0.
ノズル防熱用キャップ４は、筒状周壁部５の先端部に内
向きのシール用フランジ６を形成するとともに、基端部
に外向きの固定用７ランジ７を形成して構成しである。The nozzle heat-insulating cap 4 is constructed by forming an inward sealing flange 6 at the tip of a cylindrical peripheral wall 5 and an outward fixing flange 7 at the base end.
ノズル挿入孔３には、その内周面から内側に向かうパツ
キン受座２１を形成し、パツキン受座２１の内周縁部に
段落状の固定用フランジ受座８を形成しである。The nozzle insertion hole 3 is formed with a packing seat 21 extending inward from its inner peripheral surface, and a step-shaped fixing flange seat 8 is formed on the inner peripheral edge of the packing seat 21.
固定用フランジ受座８には、ノズル防熱用キャップ４の
固定用フランジ７を受けさせ、パツキン受座２１にはリ
ング状パツキン２２を受けさせている。The fixing flange seat 8 receives the fixing flange 7 of the nozzle heat-insulating cap 4, and the packing seat 21 receives the ring-shaped packing 22.
ノズル挿入孔３に挿入した燃料噴射ノズル９のノズル先
端部１０は、ノズル防熱用キャップ４に内嵌させ、ノズ
ルホルダ肩部１１はリング状パツキン２２の上側に接当
させ、燃料噴射ノズル９の挿入力により、ノズルホルダ
肩部１１でノズル放熱用キャップ４の固定用フランジ７
を固定用フランジ受座８に押圧固定するとともに、ノズ
ル先端面１２をシール用フランジ６に気密状に圧接させ
である。The nozzle tip 10 of the fuel injection nozzle 9 inserted into the nozzle insertion hole 3 is fitted into the nozzle heat insulation cap 4, the nozzle holder shoulder 11 is brought into contact with the upper side of the ring-shaped packing 22, and the nozzle tip 10 of the fuel injection nozzle 9 is inserted into the nozzle insertion hole 3. Due to the insertion force, the fixing flange 7 of the nozzle heat dissipation cap 4 is attached to the nozzle holder shoulder 11.
is press-fixed to the fixing flange seat 8, and the nozzle tip surface 12 is pressed against the sealing flange 6 in an airtight manner.
ノズル防熱用キャップ４の筒状周壁部５には、その途中
部に弾性を有する外向膨出湾曲部１３を周方向に沿って
形成し、ノズル挿入孔３内周面に燃料室２に向けて漸次
に内径を縮める挿入孔内テーパ面１４を設け、挿入孔内
テーパ面１４に外向膨出湾曲部１３を圧接させである。The cylindrical peripheral wall portion 5 of the nozzle heat-insulating cap 4 has an elastic outwardly bulging curved portion 13 formed along the circumferential direction in the middle thereof, and extends toward the fuel chamber 2 on the inner peripheral surface of the nozzle insertion hole 3. A tapered surface 14 in the insertion hole is provided to gradually reduce the inner diameter, and the outwardly bulging curved portion 13 is pressed against the tapered surface 14 in the insertion hole.
第２図に示す第２実施例は、第１実施例の外向膨出湾曲
部１３に代えて、筒状周壁部５に弾性を有する内向膨出
湾曲部１５を周方向に沿って形成するととともに、挿入
孔内テーパ面１４に代えて、ノズル先端部１０外周面に
燃料室２に向けて漸次に外径を縮めるノズル外周テーパ
面１６を設けたものであり、ノズル外周テーパ面１６に
内向膨出湾曲部１５を圧接させである。The second embodiment shown in FIG. 2 has an elastic inwardly bulging curved portion 15 formed along the circumferential direction on the cylindrical peripheral wall portion 5 in place of the outwardly bulging curved portion 13 of the first embodiment. , instead of the insertion hole inner tapered surface 14, a nozzle outer circumferential tapered surface 16 is provided on the outer circumferential surface of the nozzle tip 10, the outer diameter of which gradually decreases toward the fuel chamber 2, and the nozzle outer circumferential tapered surface 16 has an inward expansion. The protruding curved portion 15 is brought into pressure contact.
第１図及び第２図は本発明の実施例に係るノズル先端部
防熱装置の縦断面図であり、第１図は第１実施例、第２
図は第２実施例である。
第３図は従来技術説明図である。
ｌ・・・シリンダヘッド、２・・・燃焼室、３・・・ノ
ズル挿入孔、４・・・ノズル防熱用キャップ、５・・・
筒状周壁部、６・・・シール用フランジ、７・・・固定
用フランジ、８・・・固定用フランジ受座、９・・・燃
料噴射ノズル、１０・・・ノズル先端部、１１・・・ノ
ズルホルダ肩部、１２・・・ノズル先端面、１３・・・
外向膨出湾曲部、１４・・・挿入孔内テーパ面、１５・
・・内向膨出湾曲部、１６・・・ノズル外周テーパ面。1 and 2 are longitudinal cross-sectional views of a nozzle tip heat insulation device according to an embodiment of the present invention, and FIG.
The figure shows the second embodiment. FIG. 3 is an explanatory diagram of the prior art. l... Cylinder head, 2... Combustion chamber, 3... Nozzle insertion hole, 4... Nozzle heat insulation cap, 5...
Cylindrical peripheral wall portion, 6... Seal flange, 7... Fixing flange, 8... Fixing flange seat, 9... Fuel injection nozzle, 10... Nozzle tip, 11...・Nozzle holder shoulder, 12... Nozzle tip surface, 13...
outwardly bulging curved portion, 14... tapered surface within the insertion hole, 15;
... Inwardly bulging curved portion, 16... Nozzle outer circumferential tapered surface.
Claims (2)
室２に向かうノズル挿入孔３をあけ、ノズル挿入孔３の
燃焼室２寄り側にノズル防熱用キャップ４を内嵌させ、 ノズル防熱用キャップ４は、筒状周壁部５の先端部に内
向きのシール用フランジ６を形成するとともに、基端部
に外向きの固定用フランジ７を形成して構成し、 ノズル挿入孔３には、その内周面から内側に向かう固定
用フランジ受座８を形成し、 ノズル挿入孔３に挿入した燃料噴射ノズル９のノズル先
端部１０をノズル防熱用キャップ４に内嵌させ、燃料噴
射ノズル９の挿入力により、ノズルホルダ肩部１１で固
定用フランジ７を固定用フランジ受座８に押圧固定する
とともに、ノズル先端面１２をシール用フランジ６に気
密状に圧接させて構成した、ディーゼルエンジンの燃料
噴射ノズルのノズル先端部防熱装置において、 筒状周壁部５に弾性を有する外向膨出湾曲部１３を周方
向に沿って形成し、ノズル挿入孔３の内周面に燃料室２
に向けて漸次に内径を縮める挿入孔内テーパ面１４を設
け、挿入孔内テーパ面１４に外向膨出湾曲部１３を圧接
させた ことを特徴とするディーゼルエンジンの燃料噴射ノズル
のノズル先端部防熱装置。1. A nozzle insertion hole 3 facing the combustion chamber 2 is formed in the cylinder head 1 of a diesel engine, and a nozzle heat insulation cap 4 is fitted inside the nozzle insertion hole 3 on the side closer to the combustion chamber 2. The nozzle heat insulation cap 4 has a cylindrical shape. An inward sealing flange 6 is formed at the distal end of the peripheral wall 5, and an outward fixing flange 7 is formed at the proximal end, and the nozzle insertion hole 3 is provided with an inward facing inner peripheral surface. A fixing flange seat 8 is formed facing toward the nozzle, and the nozzle tip 10 of the fuel injection nozzle 9 inserted into the nozzle insertion hole 3 is fitted into the nozzle heat-insulating cap 4, and the insertion force of the fuel injection nozzle 9 is applied to the nozzle holder. A nozzle tip of a fuel injection nozzle for a diesel engine, which is configured by pressing and fixing a fixing flange 7 to a fixing flange seat 8 with a shoulder 11, and by bringing a nozzle tip surface 12 into airtight pressure contact with a sealing flange 6. In the heat shielding device, an elastic outwardly bulging curved portion 13 is formed in the cylindrical peripheral wall portion 5 along the circumferential direction, and a fuel chamber 2 is formed on the inner peripheral surface of the nozzle insertion hole 3.
Heat insulation for a nozzle tip of a fuel injection nozzle for a diesel engine, characterized in that an insertion hole inner tapered surface 14 is provided to gradually reduce the inner diameter toward , and an outwardly bulging curved portion 13 is pressed against the insertion hole inner tapered surface 14. Device.
ノズルのノズル先端部防熱装置において、 前記外向膨出湾曲部１３に代えて、筒状周壁部５に弾性
を有する内向膨出湾曲部１５を周方向に沿って形成し、 前記挿入孔内テーパ面１４に代えて、ノズル先端部１０
の外周面に燃料室２に向けて漸次に外径を縮めるノズル
外周テーパ面１６を設け、 ノズル外周テーパ面１６に内向膨出湾曲部１５を圧接さ
せた ことを特徴とするディーゼルエンジンの燃料噴射ノズル
のノズル先端部防熱装置。2. In the nozzle tip heat insulation device for a fuel injection nozzle of a diesel engine according to claim 1, in place of the outwardly bulging curved portion 13, an elastic inwardly bulging curved portion 15 is provided in the circumferential direction on the cylindrical peripheral wall portion 5. The nozzle tip 10 is formed along the insertion hole in place of the tapered surface 14 in the insertion hole.
Fuel injection for a diesel engine, characterized in that a nozzle outer circumferential tapered surface 16 whose outer diameter is gradually reduced toward the fuel chamber 2 is provided on the outer circumferential surface of the nozzle, and an inwardly bulging curved portion 15 is brought into pressure contact with the nozzle outer circumferential tapered surface 16. Heat insulation device for the nozzle tip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20430290A JPH0491362A (en) | 1990-07-31 | 1990-07-31 | Nozzle tip part heat preventing device for fuel injection nozzle of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20430290A JPH0491362A (en) | 1990-07-31 | 1990-07-31 | Nozzle tip part heat preventing device for fuel injection nozzle of diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0491362A true JPH0491362A (en) | 1992-03-24 |
Family
ID=16488233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20430290A Pending JPH0491362A (en) | 1990-07-31 | 1990-07-31 | Nozzle tip part heat preventing device for fuel injection nozzle of diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0491362A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19838748A1 (en) * | 1998-08-26 | 2000-03-02 | Daimler Chrysler Ag | Internal combustion engine fuel injection nozzle with shielding sleeve |
| DE19838755A1 (en) * | 1998-08-26 | 2000-03-02 | Daimler Chrysler Ag | IC engine fuel injection nozzle has thin-walled, cylindrical portion of shielding sleeve provided with region which is press fit on free end of nozzle neck |
| JP2000170628A (en) * | 1998-12-10 | 2000-06-20 | Mitsubishi Electric Corp | Fuel injection valve and seal ring |
| WO2001048370A1 (en) * | 1999-12-24 | 2001-07-05 | Robert Bosch Gmbh | Compensating element |
| WO2002066819A1 (en) * | 2001-02-21 | 2002-08-29 | Robert Bosch Gmbh | Sealing device a fuel injection valve |
| WO2005050004A1 (en) * | 2003-11-21 | 2005-06-02 | Robert Bosch Gmbh | Fuel injection valve |
| JP2007205295A (en) * | 2006-02-03 | 2007-08-16 | Mitsui Eng & Shipbuild Co Ltd | Cooling device of pilot fuel injection valve for gas engine |
| WO2015086127A1 (en) * | 2013-12-14 | 2015-06-18 | Daimler Ag | Fuel injection nozzle for an internal combustion engine |
| WO2017089229A1 (en) * | 2015-11-27 | 2017-06-01 | Robert Bosch Gmbh | Injector arrangement having a thermal protection sleeve |
| WO2020136156A1 (en) * | 2018-12-24 | 2020-07-02 | Robert Bosch Gmbh | Nozzle assembly for a fuel injector, fuel injector, and method for producing a nozzle assembly |
-
1990
- 1990-07-31 JP JP20430290A patent/JPH0491362A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19838755B4 (en) * | 1998-08-26 | 2006-11-09 | Daimlerchrysler Ag | On the combustion chamber of an internal combustion engine injecting fuel injection nozzle |
| DE19838755A1 (en) * | 1998-08-26 | 2000-03-02 | Daimler Chrysler Ag | IC engine fuel injection nozzle has thin-walled, cylindrical portion of shielding sleeve provided with region which is press fit on free end of nozzle neck |
| US6155236A (en) * | 1998-08-26 | 2000-12-05 | Daimlerchrysler Ag | Fuel injection nozzle injecting onto the combustion space of an internal combustion engine |
| DE19838748A1 (en) * | 1998-08-26 | 2000-03-02 | Daimler Chrysler Ag | Internal combustion engine fuel injection nozzle with shielding sleeve |
| DE19838748B4 (en) * | 1998-08-26 | 2008-06-19 | Daimler Ag | On the combustion chamber of an internal combustion engine injecting fuel injection nozzle |
| JP2000170628A (en) * | 1998-12-10 | 2000-06-20 | Mitsubishi Electric Corp | Fuel injection valve and seal ring |
| WO2001048370A1 (en) * | 1999-12-24 | 2001-07-05 | Robert Bosch Gmbh | Compensating element |
| US6892707B2 (en) | 2001-02-21 | 2005-05-17 | Robert Bosch Gmbh | Sealing device for a fuel injection valve |
| WO2002066819A1 (en) * | 2001-02-21 | 2002-08-29 | Robert Bosch Gmbh | Sealing device a fuel injection valve |
| WO2005050004A1 (en) * | 2003-11-21 | 2005-06-02 | Robert Bosch Gmbh | Fuel injection valve |
| JP2007205295A (en) * | 2006-02-03 | 2007-08-16 | Mitsui Eng & Shipbuild Co Ltd | Cooling device of pilot fuel injection valve for gas engine |
| WO2015086127A1 (en) * | 2013-12-14 | 2015-06-18 | Daimler Ag | Fuel injection nozzle for an internal combustion engine |
| WO2017089229A1 (en) * | 2015-11-27 | 2017-06-01 | Robert Bosch Gmbh | Injector arrangement having a thermal protection sleeve |
| CN108291512A (en) * | 2015-11-27 | 2018-07-17 | 罗伯特·博世有限公司 | Injector assembly with Thermal protection sleeve |
| CN108291512B (en) * | 2015-11-27 | 2021-02-19 | 罗伯特·博世有限公司 | Injector assembly with thermal protection sleeve |
| WO2020136156A1 (en) * | 2018-12-24 | 2020-07-02 | Robert Bosch Gmbh | Nozzle assembly for a fuel injector, fuel injector, and method for producing a nozzle assembly |
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