JPH0425432B2 - - Google Patents
Info
- Publication number
- JPH0425432B2 JPH0425432B2 JP58128751A JP12875183A JPH0425432B2 JP H0425432 B2 JPH0425432 B2 JP H0425432B2 JP 58128751 A JP58128751 A JP 58128751A JP 12875183 A JP12875183 A JP 12875183A JP H0425432 B2 JPH0425432 B2 JP H0425432B2
- Authority
- JP
- Japan
- Prior art keywords
- sleeve
- injection valve
- fuel injection
- nozzle
- nozzle tip
- 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 - Lifetime
Links
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
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
-
- 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
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
-
- 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】 本発明は内燃機関の燃料噴射弁に関する。[Detailed description of the invention] The present invention relates to a fuel injection valve for an internal combustion engine.
第１図に従来のこの種の燃料噴射弁の構造を示
す。図において、ノズルチツプ１１はキヤツプ１
２によつてノズル本体１３にねじ込み固定されて
いる。ノズルチツプ１１内にはシート14に着座す
る針弁１５があり、突棒１６、ばね受１７を通し
てばね１８で針弁１５をシート１４に押し付けて
いる。さらにばね１８の上端部のばね受１９の位
置をロツクナツト２０をいつたんゆるめて変える
ことにより針弁１５の啓開圧力を変えることがで
きる。図示していない高圧管からの燃料は高圧管
継手２１からノズル本体13に入り、通路２２をへ
てノズルチツプ１１内の通路２３を通り油溜２４
に至る。さらに、針弁１５が開くとノズル孔２５
から図示していないシリンダへ燃料が噴射され
る。 FIG. 1 shows the structure of a conventional fuel injection valve of this type. In the figure, the nozzle tip 11 is connected to the cap 1.
2 is screwed and fixed to the nozzle body 13. Inside the nozzle tip 11 is a needle valve 15 seated on a seat 14, and the needle valve 15 is pressed against the seat 14 by a spring 18 through a protruding rod 16 and a spring receiver 17. Further, by changing the position of the spring receiver 19 at the upper end of the spring 18 by loosening the lock nut 20, the opening pressure of the needle valve 15 can be changed. Fuel from a high-pressure pipe (not shown) enters the nozzle body 13 from a high-pressure pipe joint 21, passes through a passage 22, passes through a passage 23 in the nozzle tip 11, and enters an oil reservoir 24.
leading to. Furthermore, when the needle valve 15 opens, the nozzle hole 25
Fuel is injected from the cylinder into a cylinder (not shown).
第２図に燃料噴射の原理を示す特性曲線図を示
す。横軸は高圧管内の流速を示し、縦軸は圧力を
示す。直線ａは噴射前に噴射弁から帰つてきてい
る反射波であり、噴射ポンプにより高圧管のポン
プ側入口の流速がυ1に上げられるとポンプ側入口
は直線ａ上の点X1で示す状態となる。この点X1
の状態が進行波ｂによつて噴射弁に伝えられ、噴
射弁の絞り特性線n1との交点Y2が噴射弁での状
態となる。即ち、交点Y2の圧力P2で燃料を噴射
する。 FIG. 2 shows a characteristic curve diagram showing the principle of fuel injection. The horizontal axis shows the flow velocity in the high-pressure pipe, and the vertical axis shows the pressure. Straight line a is the reflected wave returning from the injection valve before injection, and when the injection pump increases the flow velocity at the pump-side inlet of the high-pressure pipe to υ 1 , the pump-side inlet is indicated by point X 1 on straight line a. state. This point x 1
The state of is transmitted to the injection valve by the traveling wave b, and the intersection Y2 with the throttle characteristic line n1 of the injection valve becomes the state of the injection valve. That is, fuel is injected at pressure P 2 at intersection Y 2 .
以上は機関が最高回転速度で作動しているとき
の燃料噴射の状況である。 The above is the fuel injection situation when the engine is operating at maximum rotational speed.
機関が低速になると噴射ポンプ駆動のカム速度
が下がるため高圧管のポンプ側入口の流速がυ3ま
で低下する。このためポンプ側入口は点X3で示
す状態となり、進行波ｃによつて噴射弁に伝えら
れる。その結果、噴射弁での状態は交点Y4とな
り、交点Y4の圧力P4で燃料を噴射する。 When the engine speed becomes low, the cam speed driving the injection pump decreases, so the flow velocity at the pump-side inlet of the high-pressure pipe decreases to υ 3 . Therefore, the pump side inlet is in the state shown by point X3 , and is transmitted to the injection valve by the traveling wave c. As a result, the state at the injection valve becomes the intersection point Y4 , and fuel is injected at the pressure P4 at the intersection point Y4 .
上記のものには次の欠点がある。 The above has the following drawbacks.
機関が低速になると噴射弁での燃料噴射の圧力
がP2からP4まで低下する。この噴射圧力の低下
により燃焼室内での燃料噴霧のペネトレーシヨン
が低下し、空気と燃料の混合が充分行われなくな
り燃焼が悪化する。その結果、燃費が悪化し、煙
り濃度が増大する不具合が生じている。 When the engine speed becomes low, the pressure of fuel injection at the injector decreases from P 2 to P 4 . This reduction in injection pressure reduces the penetration of the fuel spray within the combustion chamber, which prevents sufficient mixing of air and fuel and deteriorates combustion. As a result, problems arise in which fuel efficiency deteriorates and smoke density increases.
本発明の目的は上記の点に着目し、機関の低速
時の燃料噴射圧を高め、燃費と煙り濃度の改善を
実現できる燃料噴射弁を提供することであり、そ
の特徴とするところは、内燃機関の燃料噴射弁に
おいて、ノズルチツプと針弁との間に介装された
スリーブ、上記ノズルチツプとスリーブのそれぞ
れの下端部周壁部分を貫通して形成されたノズル
孔、上記スリーブを外部からの付勢により回動さ
せて上記ノズル孔の通路面積を絞る絞り装置を備
えたことである。 An object of the present invention is to provide a fuel injection valve that is capable of increasing fuel injection pressure at low speeds of an engine and improving fuel efficiency and smoke density. In a fuel injection valve for an engine, a sleeve is interposed between a nozzle tip and a needle valve, a nozzle hole is formed through the lower end peripheral wall portion of each of the nozzle tip and the sleeve, and the sleeve is biased from the outside. The present invention is equipped with a throttle device which narrows the passage area of the nozzle hole by rotating the nozzle hole.
以下図面を参照して本発明による実施例につき
説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第３図は本発明による１実施例の燃料噴射弁を
示す断面図である。 FIG. 3 is a sectional view showing one embodiment of a fuel injection valve according to the present invention.
図において、ノズルチツプ１１と針弁１５の間
に円筒状のスリーブ３１を設ける。スリーブ３１
は先端が円錐状になつており、ばね３２の力でノ
ズルチツプ１１の同じく円錐状の孔部に着座して
いる。また、スリーブ３１には通路孔３３が設け
られており、通路２３からの燃料を油溜２４に送
つている。さらにスリーブ３１の先端部にはシー
ト１４が設けられており、針弁１５が着座する。 In the figure, a cylindrical sleeve 31 is provided between the nozzle tip 11 and the needle valve 15. sleeve 31
has a conical tip, and is seated in the similarly conical hole of the nozzle tip 11 by the force of a spring 32. Further, a passage hole 33 is provided in the sleeve 31, and fuel from the passage 23 is sent to the oil sump 24. Furthermore, a seat 14 is provided at the tip of the sleeve 31, on which a needle valve 15 is seated.
ノズル孔２５はスリーブ３１及びノズルチツプ
１１を通して形成する。スリーブ３１とノズルチ
ツプ１１のそれぞれの下端部周壁部分を貫通して
形成されている。 Nozzle hole 25 is formed through sleeve 31 and nozzle tip 11. It is formed to penetrate through the lower end peripheral wall portions of the sleeve 31 and the nozzle tip 11, respectively.
スリーブ３１は外部から駆動できる回動軸３４
の先端部に設けたレバー３５で回動する。 The sleeve 31 has a rotation shaft 34 that can be driven from the outside.
It is rotated by a lever 35 provided at the tip.
この部分の詳細を第４図に示す。レバー３５の
回動によりスリーブ３１は針弁１５とノズルチツ
プ１１の間をスリーブに設けた溝３６とノズルチ
ツプ１１に固定されているピン３７の隙間分だけ
回動する。 Details of this part are shown in FIG. The rotation of the lever 35 causes the sleeve 31 to rotate by the amount of clearance between a groove 36 provided in the sleeve between the needle valve 15 and the nozzle tip 11 and a pin 37 fixed to the nozzle tip 11.
上記構成の場合の作用について述べる。 The operation in the case of the above configuration will be described.
機関が最高回転速度で作動している場合は、ノ
ズル孔２５は現状と同じ通路面積を確保する。 When the engine is operating at maximum rotational speed, the nozzle hole 25 maintains the same passage area as it currently has.
機関が低速になつた場合、外部から回動軸３４
を回動させ、レバー３５によつてスリーブ３１を
回動させる。その結果、第５図に示すように、ノ
ズル孔２５の最小通路面積は斜線部Ａで示すよう
に小さくなる。 When the engine becomes low speed, the rotation shaft 34 is
is rotated, and the sleeve 31 is rotated by the lever 35. As a result, as shown in FIG. 5, the minimum passage area of the nozzle hole 25 becomes smaller as indicated by the shaded area A.
上述の場合には次の効果がある。 The above case has the following effects.
機関が低速で作動する場合、回動軸３４により
スリーブ３１を回動させノズル孔２５の最小通路
面積を小さくする。その結果、第２図の特性曲線
図で、噴射弁の絞り特性線はn2のように絞られ、
高圧管のポンプ側入口の流速がυ3でも噴射弁での
状態は交点Y5となり、交点Y5の圧力P5まで燃料
の噴射圧力が高くなる。 When the engine operates at low speed, the sleeve 31 is rotated by the rotation shaft 34 to reduce the minimum passage area of the nozzle hole 25. As a result, in the characteristic curve diagram in Figure 2, the throttle characteristic line of the injection valve is narrowed as n 2 ,
Even if the flow velocity at the pump-side inlet of the high-pressure pipe is υ 3 , the state at the injection valve is at intersection Y 5 , and the fuel injection pressure increases to the pressure P 5 at intersection Y 5 .
このため低速での燃費及び煙り濃度の改善を実
現することができる。 Therefore, it is possible to improve fuel efficiency and smoke density at low speeds.
また、構造的にスリーブ３１の先端を円錐状に
してノズルチツプ１１に着座させている。この結
果、針弁１５と同様に着座部分の摺合せ加工が可
能となり、ノズル孔２５部分のノズルチツプ１１
とスリーブ３１の間の隙間を最小にし、漏れを防
ぎ、実用的なものとすることができる。 Further, structurally, the tip of the sleeve 31 is made conical and is seated on the nozzle tip 11. As a result, similar to the needle valve 15, it is possible to perform sliding processing on the seated portion, and the nozzle tip 11 in the nozzle hole 25 portion
The gap between the sleeve 31 and the sleeve 31 can be minimized to prevent leakage and be practical.
第１図は従来の燃料噴射弁を示す断面図、第２
図は燃料噴射の原理を示す特性曲線図、第３図は
本発明による１実施例の燃料噴射弁を示す断面
図、第４図は第３図の−矢視断面図、第５図
は第３図の矢視図である。
１１……ノズルチツプ、１５……針弁、２５…
…ノズル孔、３１……スリーブ。
Figure 1 is a sectional view showing a conventional fuel injection valve, Figure 2 is a sectional view showing a conventional fuel injection valve.
The figure is a characteristic curve diagram showing the principle of fuel injection, FIG. 3 is a sectional view showing a fuel injection valve according to an embodiment of the present invention, FIG. 4 is a sectional view taken along the - arrow in FIG. 3, and FIG. 3 is a view taken along the arrow in FIG. 3; FIG. 11... Nozzle tip, 15... Needle valve, 25...
...Nozzle hole, 31...Sleeve.
Claims (1)
プと針弁のと間に介装されたスリーブ、上記ノズ
ルチツプとスリーブのそれぞれの下端部周壁部分
を貫通して形成されたノズル孔、上記スリーブを
外部からの付勢により回動させて上記ノズル孔の
通路面積を絞る絞り装置を備えたことを特徴とす
る燃料噴射弁。1. In a fuel injection valve for an internal combustion engine, a sleeve interposed between a nozzle tip and a needle valve, a nozzle hole formed by penetrating the lower end circumferential wall portion of each of the nozzle tip and the sleeve, and a sleeve inserted from the outside. A fuel injection valve characterized by comprising a throttle device that is rotated by force to narrow down the passage area of the nozzle hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12875183A JPS6022071A (en) | 1983-07-16 | 1983-07-16 | fuel injection valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12875183A JPS6022071A (en) | 1983-07-16 | 1983-07-16 | fuel injection valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6022071A JPS6022071A (en) | 1985-02-04 |
| JPH0425432B2 true JPH0425432B2 (en) | 1992-04-30 |
Family
ID=14992560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12875183A Granted JPS6022071A (en) | 1983-07-16 | 1983-07-16 | fuel injection valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6022071A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5127584A (en) * | 1991-05-06 | 1992-07-07 | General Motors Corporation | Fuel injection nozzle |
| DE4235948C2 (en) * | 1992-10-23 | 1995-08-31 | Mtu Friedrichshafen Gmbh | Fuel injection nozzle for internal combustion engines |
| JPH0893601A (en) * | 1994-09-22 | 1996-04-09 | Zexel Corp | Fuel injection nozzle |
| KR19990022026A (en) * | 1995-06-09 | 1999-03-25 | 오타 유다카 | Fuel injection nozzle with variable injection hole area |
| US5947389A (en) * | 1996-06-06 | 1999-09-07 | Zexel Corporation | Variable nozzle hole type fuel injection nozzle |
| GB9903496D0 (en) * | 1999-02-16 | 1999-04-07 | Lucas Ind Plc | Fuel injector |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH622588A5 (en) * | 1977-09-01 | 1981-04-15 | Sulzer Ag |
-
1983
- 1983-07-16 JP JP12875183A patent/JPS6022071A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6022071A (en) | 1985-02-04 |
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