JPH0154552B2 - - Google Patents
Info
- Publication number
- JPH0154552B2 JPH0154552B2 JP55150882A JP15088280A JPH0154552B2 JP H0154552 B2 JPH0154552 B2 JP H0154552B2 JP 55150882 A JP55150882 A JP 55150882A JP 15088280 A JP15088280 A JP 15088280A JP H0154552 B2 JPH0154552 B2 JP H0154552B2
- Authority
- JP
- Japan
- Prior art keywords
- hole
- fuel
- conical
- fuel injection
- taper angle
- 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
- 239000000446 fuel Substances 0.000 claims description 42
- 238000002347 injection Methods 0.000 claims description 20
- 239000007924 injection Substances 0.000 claims description 20
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007789 sealing Methods 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
-
- 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/004—Joints; Sealings
- F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
-
- 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
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、ノズル保持体を備え、ノズル保持体
の、燃料噴射側とは反対の側に燃料噴射ノズルの
長手方向に延びる燃料導管接続部が設けられ、こ
の燃料導管接続部が接続円錐孔を有し、この接続
円錐孔に燃料導管の円錐体が、ノズル保持体に係
合するスリーブナツトによつて緊締されており、
接続円錐孔からはばね室を迂回している燃料通路
が分岐し、この燃料通路が、接続円錐孔に接続し
ている袋孔から分岐していてノズル保持体の縁範
囲に向かつて延びている斜孔と、この斜孔に接続
しかつばね室に対して平行に延びていてノズル保
持体の端面側に達する孔とから成つている、内燃
機関用の燃料噴射ノズルに関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention comprises a nozzle holder, and a fuel conduit connection part extending in the longitudinal direction of the fuel injection nozzle is provided on the side of the nozzle holder opposite to the fuel injection side. the fuel conduit connection portion has a connecting conical hole, into which the conical body of the fuel conduit is tightened by a sleeve nut that engages with the nozzle holder;
A fuel duct, which bypasses the spring chamber, branches off from the connecting conical bore, and this fuel duct branches off from the blind bore, which is connected to the connecting conical bore, and extends towards the edge area of the nozzle holder. The present invention relates to a fuel injection nozzle for an internal combustion engine, comprising a diagonal hole and a hole connected to the diagonal hole, extending parallel to a spring chamber and reaching an end surface of a nozzle holder.
従来の技術
このような形式の燃料噴射ノズルにおいて円錐
状のシール座におけるシール圧は、テーパ角度
と、円錐体を円錐孔に圧着する力とによつて規定
される。実際にはこのために60゜のテーパ角度が
用いられている。そして円錐孔に接続している袋
孔から分岐している斜孔の傾斜は、円錐孔の深さ
とテーパ角度とによつて規定される。なぜなら
ば、前記斜孔の穴あけの際に円錐孔が損傷されて
はならないからである。ゆえに公知の燃料噴射ノ
ズルにおいては、ばね室と燃料導管接続部との間
のノズル保持体区分は比較的長く構成されてい
る。しかしながらこの構成は、燃料噴射ノズルの
長さを短くしようとする内燃機関制作者の要求に
相反するものである。なぜならば、最近の自動車
工業の発達においては種々様々な理由（例えば付
属ユニツトの重量軽減）からラジエータボンネツ
トの下にはほとんど余分な空間がないからであ
る。上述のように形状を円錐孔のテーパ角度によ
つて規定される斜孔は、燃料噴射ノズルの全長に
著しく大きな影響を有しているが、円錐孔のテー
パ角度はさらにシールにも影響しているので、斜
孔にとつて望ましいテーパ角度を円錐孔に与える
ことはできない。BACKGROUND OF THE INVENTION In this type of fuel injection nozzle, the sealing pressure at the conical seal seat is determined by the taper angle and the force that presses the conical body into the conical hole. In practice, a taper angle of 60° is used for this purpose. The slope of the oblique hole branching from the blind hole connected to the conical hole is defined by the depth and taper angle of the conical hole. This is because the conical hole must not be damaged when drilling the oblique hole. In known fuel injection nozzles, therefore, the nozzle carrier section between the spring chamber and the fuel line connection is designed to be relatively long. However, this arrangement conflicts with the desire of internal combustion engine manufacturers to reduce the length of the fuel injection nozzle. This is because, in the recent development of the automobile industry, there is little extra space under the radiator bonnet for various reasons (for example, to reduce the weight of accessory units). As mentioned above, the oblique hole whose shape is determined by the taper angle of the conical hole has a significantly large effect on the overall length of the fuel injection nozzle, but the taper angle of the conical hole also affects the seal. Therefore, it is not possible to provide the conical hole with the desired taper angle for the oblique hole.
発明の課題
ゆえに本発明の課題は、上に述べた公知の燃料
噴射ノズルを改良して、燃料噴射ノズルの全長を
従来のものに比べて短くすることである。OBJECT OF THE INVENTION It is therefore an object of the present invention to improve the above-mentioned known fuel injection nozzle so that the overall length of the fuel injection nozzle is shorter than that of conventional ones.
課題を解決するための手段
この課題を解決するために本発明の燃料噴射ノ
ズルでは、接続円錐孔が、大きなテーパ角度を有
する外側の円錐孔と、この円錐孔に接続しかつ燃
料導管の円錐体に相当するテーパ角度を有する内
側の円錐孔とから構成されている。Means for Solving the Problem In order to solve this problem, in the fuel injection nozzle of the present invention, the connecting conical hole is connected to the outer conical hole having a large taper angle and connected to the conical hole of the fuel conduit. an inner conical hole with a taper angle corresponding to .
発明の効果
本発明のように構成されていると、内側の円錐
孔よりさらに外側に位置している円錐孔がより大
きなテーパ角度を有していることに基づいて、斜
孔の角度を従来のものに比べてゆるやかにするこ
とができ、従つてその分円錐孔をばね室に向かつ
て下げることができる。この結果燃料導管の円錐
体もより深くノズル保持体内に進入するので、ス
リーブナツトは従来よりも多数のねじによつてノ
ズル保持体と螺合することができる。従つて本発
明によれば、燃料噴射ノズルの全長が所望されて
いるように短くなるだけでなく、燃料導管接続部
のゆるみに対しても大きな確実性が得られる。Effects of the Invention With the structure of the present invention, the angle of the oblique hole is changed from that of the conventional one based on the fact that the conical hole located further outward than the inner conical hole has a larger taper angle. This allows the conical hole to be lowered toward the spring chamber. As a result, the cone of the fuel conduit also penetrates deeper into the nozzle holder, so that the sleeve nut can be screwed into the nozzle holder with a greater number of threads than before. According to the invention, therefore, not only is the overall length of the fuel injection nozzle reduced as desired, but also greater reliability is achieved against loosening of the fuel line connections.
実施例 次に図面につき本発明の実施例を説明する。Example Next, embodiments of the present invention will be described with reference to the drawings.
図示の燃料噴射ノズルにおいては、ノズル本体
（図示せず）は締付ナツト１によつて中間プレー
ト２を介在させてノズル保持体３に緊締されてい
る。ノズル本体はノズルニードル４を受容し、こ
のノズルニードル４はばね受け５を介して閉鎖ば
ね６によつて負荷されている。閉鎖ばね６はばね
室７に配置され、このばね室７は小径孔８とこの
小径孔８に接続する大径孔９とを介して燃料逃が
しホース接続管片１０に通じ圧力無負荷状態であ
る。ノズルニードル４とノズル本体との間に配置
されている圧力室（図示せず）には、燃料導管１
１と斜孔１２と、ばね室７に対して平行に延びて
いる孔１３とを介して燃料が供給される。燃料導
管１１は円錐体１４と堅く結合され、この円錐体
１４は、ノズル保持体３の雄ねじ１５に係合して
いるスリーブナツト１６を介して円錐孔１７に緊
締される。円錐体１４のテーパ角度並びに円錐孔
１７のテーパ角度はそれぞれ60゜である。円錐体
１４の肩部とスリーブナツト１６との間には締付
けリング１８が配設されている。円錐孔１７の燃
料導管側にはより大きなテーパ角度を有する円錐
孔１９が接続されている。この大きなテーパ角度
を有する円錐孔１９にはさらに、同様に燃料噴射
ノズルの全長を短くするのに役立つ円筒状区分２
０が接続されている。円錐孔１７のばね室側には
円筒状の袋孔２１が接続され、この袋孔２１の円
錐底部２２からは斜孔１２が偏心的に分岐してい
る。斜孔１２の穴あけに際してドリル刃に両円錐
孔１７，１９の面も円筒状区分２０の面も接しな
いということは破線２３によつて示されている。
しかしながら、もし円錐孔１７が外方（図面で見
て上方）に向かつてさらに延ばされていると、ド
リル刃の制限縁（破線２３参照）と円錐孔１７の
局面とは符号２４で示されている箇所において重
なつてしまう。 In the illustrated fuel injection nozzle, a nozzle body (not shown) is fastened to a nozzle holder 3 by a tightening nut 1 with an intermediate plate 2 interposed. The nozzle body receives a nozzle needle 4 which is loaded by a closing spring 6 via a spring receiver 5 . The closing spring 6 is arranged in a spring chamber 7 which communicates via a small-diameter hole 8 and a large-diameter hole 9 connected to the small-diameter hole 8 with a fuel relief hose connection piece 10 in a pressure-free state. . A pressure chamber (not shown) disposed between the nozzle needle 4 and the nozzle body includes a fuel conduit 1.
Fuel is supplied via 1, an oblique hole 12 and a hole 13 extending parallel to the spring chamber 7. The fuel conduit 11 is rigidly connected to a cone 14 which is tightened into the conical bore 17 via a sleeve nut 16 which engages an external thread 15 of the nozzle holder 3. The taper angle of the conical body 14 and the taper angle of the conical hole 17 are each 60°. A tightening ring 18 is arranged between the shoulder of the cone 14 and the sleeve nut 16. A conical hole 19 having a larger taper angle is connected to the fuel conduit side of the conical hole 17. This conical bore 19 with a large taper angle additionally has a cylindrical section 2 which also serves to shorten the overall length of the fuel injection nozzle.
0 is connected. A cylindrical blind hole 21 is connected to the spring chamber side of the conical hole 17, and an oblique hole 12 branches eccentrically from a conical bottom 22 of the blind hole 21. It is indicated by a dashed line 23 that neither the surfaces of the two conical holes 17, 19 nor the surface of the cylindrical section 20 come into contact with the drill bit when drilling the oblique hole 12.
However, if the conical bore 17 were to be extended further outwards (upwards in the drawing), the limiting edge of the drill bit (see dashed line 23) and the flank of the conical bore 17 would be indicated by 24. They will overlap in the places where they are.
図面は本発明による燃料噴射ノズルの部分縦断
面図である。
１……締付けナツト、２……中間プレート、３
……ノズル保持体、４……ノズルニードル、５…
…ばね受け、６……閉鎖ばね、７……ばね室、８
……小径孔、９……大径孔、１０……燃料逃がし
ホース接続管片、１１……燃料導管、１２……斜
孔、１３……孔、１４……円錐体、１５……雄ね
じ、１６……スリーブナツト、１７，１９……円
錐孔、１８……締付けリング、２０……円筒状区
分、２１……袋孔、２２……円錐底部、２３……
破線、２４……箇所。
The drawing is a partial longitudinal sectional view of a fuel injection nozzle according to the invention. 1...Tightening nut, 2...Intermediate plate, 3
...Nozzle holder, 4... Nozzle needle, 5...
...Spring receiver, 6...Closing spring, 7...Spring chamber, 8
... Small diameter hole, 9 ... Large diameter hole, 10 ... Fuel relief hose connection piece, 11 ... Fuel conduit, 12 ... Oblique hole, 13 ... Hole, 14 ... Cone, 15 ... Male thread, 16... Sleeve nut, 17, 19... Conical hole, 18... Tightening ring, 20... Cylindrical section, 21... Blind hole, 22... Conical bottom, 23...
Broken line, 24... places.
Claims (1)
燃料噴射側とは反対の側に燃料噴射ノズルの長手
方向に延びる燃料導管接続部が設けられ、この燃
料導管接続部が接続円錐孔を有し、この接続円錐
孔に燃料導管１１の円錐体１４が、ノズル保持体
３に係合するスリーブナツト１６によつて緊締さ
れており、接続円錐孔からはばね室７を迂回して
いる燃料通路が分岐し、この燃料通路が、接続円
錐孔に接続している袋孔２１から分岐していてノ
ズル保持体３の縁範囲に向かつて延びている斜孔
１２と、この斜孔１２に接続しかつばね室７に対
して平行に延びていてノズル保持体３の端面側に
達する孔１３とから成つている、内燃機関用の燃
料噴射ノズルにおいて、接続円錐孔が、大きなテ
ーパ角度を有する外側の円錐孔１９と、この円錐
孔１９に接続しかつ燃料導管の円錐体１４に相当
するテーパ角度を有する内側の円錐孔１７とから
構成されていることを特徴とする、内燃機関用の
燃料噴射ノズル。 ２ 外側の円錐孔１９が90゜のテーパ角度を有し、
内側の円錐孔１７が60゜のテーパ角度を有してい
る特許請求の範囲第１項記載の燃料噴射ノズル。 ３ 円錐体１４のほぼ半分が内側の円錐孔１７に
よつておおわれる特許請求の範囲第１項記載の燃
料噴射ノズル。[Claims] 1. A nozzle holder 3, comprising:
A longitudinally extending fuel line connection of the fuel injection nozzle is provided on the side opposite the fuel injection side, which fuel line connection has a connecting conical bore into which the cone 14 of the fuel line 11 is inserted. is tightened by a sleeve nut 16 that engages with the nozzle holder 3, and a fuel passage bypassing the spring chamber 7 branches from the connecting conical hole, and this fuel passage is connected to the connecting conical hole. a diagonal hole 12 branching from the blind hole 21 extending towards the edge area of the nozzle holder 3; and a nozzle holder connected to the oblique hole 12 and extending parallel to the spring chamber 7 In a fuel injection nozzle for an internal combustion engine, the connecting conical bore is connected to an outer conical bore 19 with a large taper angle and to which the fuel is injected. Fuel injection nozzle for an internal combustion engine, characterized in that it consists of an inner conical hole 17 with a taper angle corresponding to the cone 14 of the conduit. 2. The outer conical hole 19 has a taper angle of 90°,
2. A fuel injection nozzle according to claim 1, wherein the inner conical bore has a taper angle of 60°. 3. The fuel injection nozzle according to claim 1, wherein approximately half of the conical body 14 is covered by the inner conical hole 17.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792943744 DE2943744A1 (en) | 1979-10-30 | 1979-10-30 | FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5675959A JPS5675959A (en) | 1981-06-23 |
| JPH0154552B2 true JPH0154552B2 (en) | 1989-11-20 |
Family
ID=6084702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15088280A Granted JPS5675959A (en) | 1979-10-30 | 1980-10-29 | Fuel injection nozzle for internal combustion engine |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5675959A (en) |
| DE (1) | DE2943744A1 (en) |
| FR (1) | FR2468759A1 (en) |
| GB (1) | GB2062753B (en) |
| IT (1) | IT1134017B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60134869U (en) * | 1984-02-20 | 1985-09-07 | マツダ株式会社 | Fuel return structure of fuel injection nozzle |
| DE19607013C2 (en) * | 1996-02-24 | 1998-01-22 | Bosch Gmbh Robert | Internal combustion engines with a valve body made of plastic |
| DE19623758A1 (en) * | 1996-06-14 | 1997-12-18 | Bosch Gmbh Robert | Fuel supply device for a fuel injection valve for internal combustion engines |
| DE19843346B4 (en) * | 1998-09-22 | 2009-03-19 | Robert Bosch Gmbh | Fuel injection valve device for internal combustion engines |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5376221A (en) * | 1976-12-17 | 1978-07-06 | Lucas Industries Ltd | Fuel injection mechanism |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR881573A (en) * | 1941-02-14 | 1943-04-29 | Deckel Friedrich | Injection nozzle for internal combustion engines |
| FR77534E (en) * | 1960-04-19 | 1962-03-16 | Device for connecting each tube respectively to the injection pump and to an injector on internal combustion engines | |
| FR1592240A (en) * | 1968-10-28 | 1970-05-11 | ||
| DE2028453A1 (en) * | 1970-06-10 | 1971-12-16 | Robert Bosch Gmbh, 7000 Stuttgart | Fuel injector |
| CH519102A (en) * | 1970-11-09 | 1972-02-15 | Saurer Ag Adolph | Injection nozzle for internal combustion engines with fuel injection |
| DD128126A1 (en) * | 1976-11-10 | 1977-11-02 | Hans Graser | INJECTION LINE FOR INTERNAL COMBUSTION ENGINES |
| US4228960A (en) * | 1977-09-09 | 1980-10-21 | Lucas Industries Limited | Liquid fuel injectors |
| DE2910678C2 (en) * | 1978-03-21 | 1985-09-05 | Tatra N.P., Kopřivnice | Screw connection for pressure lines |
-
1979
- 1979-10-30 DE DE19792943744 patent/DE2943744A1/en active Granted
-
1980
- 1980-10-24 IT IT25551/80A patent/IT1134017B/en active
- 1980-10-27 FR FR8022947A patent/FR2468759A1/en active Granted
- 1980-10-29 JP JP15088280A patent/JPS5675959A/en active Granted
- 1980-10-29 GB GB8034708A patent/GB2062753B/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5376221A (en) * | 1976-12-17 | 1978-07-06 | Lucas Industries Ltd | Fuel injection mechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2943744C2 (en) | 1992-02-27 |
| DE2943744A1 (en) | 1981-05-14 |
| GB2062753B (en) | 1983-03-16 |
| IT1134017B (en) | 1986-07-24 |
| IT8025551A0 (en) | 1980-10-24 |
| GB2062753A (en) | 1981-05-28 |
| FR2468759A1 (en) | 1981-05-08 |
| FR2468759B1 (en) | 1984-05-25 |
| JPS5675959A (en) | 1981-06-23 |
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