JP2005538296A - Injector for injecting fuel into the combustion chamber of an internal combustion engine, especially a common rail injector with servo valve control - Google Patents

Injector for injecting fuel into the combustion chamber of an internal combustion engine, especially a common rail injector with servo valve control Download PDF

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JP2005538296A
JP2005538296A JP2004534955A JP2004534955A JP2005538296A JP 2005538296 A JP2005538296 A JP 2005538296A JP 2004534955 A JP2004534955 A JP 2004534955A JP 2004534955 A JP2004534955 A JP 2004534955A JP 2005538296 A JP2005538296 A JP 2005538296A
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nozzle needle
nozzle
injector
end surface
needle
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シュタール カール−ハインツ
ヴォルフガング　シュテックライン
シュミーダー ディトマー
クリステン オリヴァー
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • 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
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/001—Control chambers formed by movable sleeves
    • 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
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

内燃機関の燃焼室に燃料を噴射するためのインジェクタ、特にサーボ弁制御式のコモンレールインジェクタであって、ノズル体（１０）が設けられており、ノズル体（１０）の燃焼室側の自由な端部にノズル流出口（１２）が形成されており、さらにノズルニードル（１４）が設けられており、ノズルニードル（１４）が、ノズル体（１０）の縦孔（１１）内で軸方向運動可能もしくは軸方向作動可能に配置されている。さらに縦孔（１１）の、ノズル流出口（１２）とは反対側の後方の端部を閉鎖する、上方でノズル体（１０）に隣接する閉鎖部（１７）が設けられており、閉鎖部（１７）が、ノズルニードル（１４）のための開放ストッパ（２９）を形成しており、閉鎖部（１７）が、ノズルニードル（１４）の、ノズル流出口（１２）とは反対側の背面側の端面（３７）と協働して、ノズルニードル（１４）の開放ストローク（ｈＤＮ）を制限するようになっている。さらに後方のノズルニードル端面（３７）と閉鎖部（１７）との間に形成された制御室（２８）が設けられており、制御室（２８）が、燃料供給に役立つ圧力接続部（２１）とハイドロリック式に結合されている。
このインジェクタの主要な構成によれば、ノズルニードル（１４）の背面側の端面（３７）および／または閉鎖部（１７）の、該端面（３７）と協働する当接面（２９）が、次のように形成されており、つまりノズルニードル（１４）の開放位置で、背面側のノズルニードル端面（３７）と閉鎖部（１７）の当接面（２９）との間で点状または実質的に点状の接触面（Ｐ）が生じるように、形成されている。An injector for injecting fuel into a combustion chamber of an internal combustion engine, particularly a servo valve control type common rail injector, provided with a nozzle body (10), and a free end of the nozzle body (10) on the combustion chamber side The nozzle outlet (12) is formed in the part, and the nozzle needle (14) is further provided. The nozzle needle (14) can move in the axial direction within the vertical hole (11) of the nozzle body (10). Alternatively, it is arranged so as to be operable in the axial direction. Further, a closing portion (17) adjacent to the nozzle body (10) above is provided to close the rear end of the vertical hole (11) opposite to the nozzle outlet (12). (17) forms an open stopper (29) for the nozzle needle (14), and the closure (17) is the back of the nozzle needle (14) opposite the nozzle outlet (12). In cooperation with the end face (37) on the side, the opening stroke (h DN ) of the nozzle needle (14) is limited. Further, a control chamber (28) formed between the rear nozzle needle end surface (37) and the closing portion (17) is provided, and the control chamber (28) is a pressure connection portion (21) useful for fuel supply. And hydraulically coupled.
According to the main configuration of this injector, the abutting surface (29) cooperating with the end surface (37) of the rear surface end surface (37) and / or the closing part (17) of the nozzle needle (14) That is, it is formed as follows, that is, in the open position of the nozzle needle (14), between the nozzle needle end surface (37) on the back side and the contact surface (29) of the closing portion (17). It is formed so that a point-like contact surface (P) is generated.

Description

本発明は、内燃機関の燃焼室に燃料を噴射するためのインジェクタ、特にサーボ弁制御式のコモンレールインジェクタであって、ノズル体が設けられており、ノズル体の燃焼室側の（自由な）端部にノズル流出口が形成されており、ノズルニードルが設けられており、ノズルニードルが、ノズル体の縦孔内で軸方向運動可能もしくは軸方向作動可能に配置されており、縦孔の（ノズル流出口とは反対側の）後方の端部を閉鎖する、（上方で）ノズル体に隣接する閉鎖部が設けられており、閉鎖部が、ノズルニードルのための開放ストッパを形成しており、閉鎖部が、ノズルニードルの（ノズル流出口とは反対側の）背面側の端面と協働して、ノズルニードルの開放ストロークを制限するようになっており、後方のノズルニードル端面と閉鎖部との間に形成された制御室が設けられており、制御室が、燃料供給に役立つ圧力接続部とハイドロリック式に結合されている形式のものに関する。   The present invention is an injector for injecting fuel into a combustion chamber of an internal combustion engine, in particular, a servo-valve-controlled common rail injector, which is provided with a nozzle body, and a (free) end on the combustion chamber side of the nozzle body. The nozzle outlet is formed in the part, the nozzle needle is provided, the nozzle needle is arranged so as to be axially movable or axially operable in the vertical hole of the nozzle body, A closure is provided (above) adjacent to the nozzle body, closing the rear end (opposite the outlet), the closure forming an opening stopper for the nozzle needle; The closing part cooperates with the end face of the nozzle needle on the back side (opposite to the nozzle outlet) to limit the opening stroke of the nozzle needle, and the rear nozzle needle end face and the closing part It formed the control chamber is provided between the control chamber, to be of the type which are coupled to the pressure connection and the hydraulic help fuel supply.

背景技術
このような形式のＣＲインジェクタは、ドイツ連邦共和国特許出願公開第１９９３６６６８号明細書から公知である。公知のインジェクタでは、閉鎖部の平面状の当接面と協働する背面側のノズルニードル端面も同様に扁平に形成されている。所望のニードルストロークは、背面側のノズルニードル端面の適当な研削加工によって形成される。 BACKGROUND OF THE INVENTION A CR injector of this type is known from German Offenlegungsschrift 199336668. In the known injector, the nozzle needle end surface on the back side that cooperates with the planar contact surface of the closing portion is similarly formed flat. The desired needle stroke is formed by appropriate grinding of the nozzle needle end face on the back side.

個々のインジェクタの数的なばらつきによるニードルストローク誤差は、できるだけ小さくする必要があるという観点から、公知の平面状の２つの当接面のコンセプトから多くの欠点が生じる。そのうちの１つを述べると、一方ではノズルニードルの製作時の製作誤差に基づいて、また他方ではノズル体におけるノズルニードルのためのガイド孔の製作誤差に基づいて、ノズルニードルが軸方向運動する際に、ノズルニードルが幾分か側方運動もしくは傾動する（いわゆる端面当接；Stirnschlag）ような不都合な作用が生じる。これによってノズルニードルが回動する際にニードルストロークが変化して、ひいてはニードルストローク誤差が増加する恐れがある。またこれに応じて作用する不都合な点によれば、製作誤差に起因して、ノズルニードルのガイド孔に対して閉鎖部が斜めに位置する。   Many disadvantages arise from the well-known concept of two flat abutment surfaces in that the needle stroke error due to the numerical variation of the individual injectors needs to be as small as possible. One of them is when the nozzle needle moves in the axial direction on the one hand, based on the manufacturing error when manufacturing the nozzle needle, and on the other hand, based on the manufacturing error of the guide hole for the nozzle needle in the nozzle body. In addition, there is an adverse effect that the nozzle needle is somewhat laterally moved or tilted (so-called end face contact; Stirnschlag). As a result, when the nozzle needle rotates, the needle stroke may change, and as a result, the needle stroke error may increase. Also, according to the inconvenient point acting accordingly, the closing portion is located obliquely with respect to the guide hole of the nozzle needle due to manufacturing errors.

ノズルニードルにおけるニードルストローク部の研磨に際して、触知測定器（Messtaster）は面接触する必要があるので、不都合に大きな調節誤差が生じる。   When the needle stroke portion of the nozzle needle is polished, the tactile measuring instrument (Messtaster) needs to be in surface contact with the nozzle needle.

ノズルニードルの開放位置では、背面側の端面が、閉鎖部の同様に扁平な当接面にフラットに接触し、このことはノズルニードルの上方に形成された制御室の不都合な減少を意味する。ノズルニードルは「付着」して、次第にこれによってノズルで流出する噴射量が過度に大きくなるという不都合な結果をもたらすようになる。   In the open position of the nozzle needle, the end face on the back side is in flat contact with the flat abutting surface of the closing part, which means an inconvenient reduction of the control chamber formed above the nozzle needle. Nozzle needles “stick” and gradually lead to the disadvantageous consequence that the amount of jet flowing out of the nozzle becomes excessively large.

本発明の課題は、上記の欠点を克服する、つまり最小限のノズルニードルストローク誤差が生じること、ノズルニードルが回動しても一定のノズルニードルストロークが生じること、ならびにノズルニードルストロークの研磨に際して極めて小さな調節誤差しか生じないことを特徴とするインジェクタを提供することである。   The object of the present invention is to overcome the above-mentioned drawbacks, that is, that a minimum nozzle needle stroke error occurs, that a constant nozzle needle stroke occurs even when the nozzle needle rotates, and that the nozzle needle stroke is extremely polished. To provide an injector characterized in that only small adjustment errors occur.

発明の利点
この課題を解決するための本発明の装置によれば、ノズルニードルの背面側の端面および／または閉鎖部の、該端面と協働する当接面が、次のように形成されており、つまりノズルニードルの開放位置で、背面側のノズルニードル端面と閉鎖部の当接面との間で点状または実質的に点状の接触面が生じるように、形成されている。 Advantages of the Invention According to the apparatus of the present invention for solving this problem, the end surface of the back side of the nozzle needle and / or the abutment surface of the closing portion that cooperates with the end surface is formed as follows. In other words, at the open position of the nozzle needle, a point-like or substantially point-like contact surface is formed between the nozzle needle end surface on the back side and the contact surface of the closing portion.

本発明の有利な実施形態によれば、閉鎖部の、背面側のノズルニードル端面と協働する当接面が、平面状に形成されており、ノズルニードルが、ボール状、有利には球状の背面側の端面を備えている。   According to an advantageous embodiment of the invention, the abutment surface of the closure, which cooperates with the end face of the nozzle needle on the rear side, is formed in a plane, and the nozzle needle is ball-shaped, preferably spherical. It has an end face on the back side.

本発明の実施形態によって、ノズルニードルの上位の当接位置、つまりノズルニードルの開放位置で、閉鎖部と、ノズルニードルの背面側の（上位の）端面との間で（ほぼ）点状の接触面が形成される。これによって、技術的な手間をあまりかけずに、該当する形式の公知のインジェクタにおける前述の欠点が克服される。したがってノズルニードルのストローク誤差を±０．０１ｍｍから±０．００３ｍｍに低減することができる。特に開放位置での、ストッパに対するノズルニードルの不都合な「付着」が防止され、このことはインジェクタから供給される噴射量に関する比較的大きな節減を意味する。   According to an embodiment of the present invention, at the upper contact position of the nozzle needle, that is, at the open position of the nozzle needle, (almost) point-like contact between the closing portion and the (upper) end face on the back side of the nozzle needle A surface is formed. This overcomes the above-mentioned drawbacks of the known types of known injectors without much technical effort. Therefore, the stroke error of the nozzle needle can be reduced from ± 0.01 mm to ± 0.003 mm. Inadvertent “sticking” of the nozzle needle to the stopper, especially in the open position, is prevented, which means a relatively large savings with respect to the injection quantity delivered from the injector.

一方ではノズルニードルの、また他方では閉鎖部の、協働する面における塑性変形を回避するために、背面側のノズルニードル端面の半径は、閉鎖部の当接面に接触する位置で、ノズルニードルに作用する開放力を考慮して、許容ヘルツ応力を超えないように、寸法設定するのが望ましい。   In order to avoid plastic deformation on the cooperating surface of the nozzle needle on the one hand and on the other hand on the other hand, the radius of the nozzle needle end face on the back side is the position where the nozzle needle is in contact with the contact surface of the closing part. It is desirable to set the dimensions so as not to exceed the allowable Hertz stress in consideration of the opening force acting on the.

実施例の説明
次に本発明の実施例を図示し、詳しく説明する。 Description of Examples Next, examples of the present invention will be illustrated and described in detail.

符号１０で、センタリングされた縦孔１１を備えた、多段式に形成されたノズル体の全体を示した。縦孔１１は下位端部で狭窄してノズル流出口１２を成している。ノズル流出口１２の上方で縦孔１１は円錐形の弁座１３を形成している。縦孔１１内には、全体を符号１４で示したノズルニードルが軸方向可動に配置されている。ノズルニードル１４の、先細の下位端部１５は、円錐形に形成されていて、かつ同様に円錐形の弁座１３と協働する。   Reference numeral 10 indicates the entire multi-stage nozzle body including the centered vertical hole 11. The vertical hole 11 is narrowed at the lower end to form a nozzle outlet 12. The vertical hole 11 forms a conical valve seat 13 above the nozzle outlet 12. In the vertical hole 11, a nozzle needle generally indicated by reference numeral 14 is disposed so as to be movable in the axial direction. The tapered lower end 15 of the nozzle needle 14 is conical and cooperates with the conical valve seat 13 as well.

弁体１０の上方で、弁体１０の上位端面１６に緊密に被せ嵌められるように、ディスク状の閉鎖部１７が配置されている。閉鎖部１７にサーボ弁体１８が同様に緊密に続いており、サーボ弁体１８内に、たとえば圧電作動式のサーボ弁１９が収容されている。   A disc-shaped closing portion 17 is disposed above the valve body 10 so as to be tightly fitted on the upper end surface 16 of the valve body 10. The servo valve body 18 is also closely connected to the closing portion 17 in the same manner. For example, a piezoelectric actuated servo valve 19 is accommodated in the servo valve body 18.

弁体１０、閉鎖部１７およびサーボ弁体１８は、インジェクタケーシング２０によって取り囲まれていて、かつ図１に示した配置構造で固定されている。   The valve body 10, the closing part 17, and the servo valve body 18 are surrounded by the injector casing 20, and are fixed by the arrangement structure shown in FIG.

図１からさらに判るように、サーボ弁体１８内に高圧通路２１が形成されており、高圧通路２１は、図示していない高圧接続部を介して、同様に図示していない燃料高圧アキュムレータ（いわゆるコモンレール）とハイドロリック式に結合されている。高圧通路２１は、拡張部２２を介して、サーボ弁体１８の下位端面２３で開口していて、そこで閉鎖部１７内に形成された２つの孔２４，２５とハイドロリック式に結合されている。第１の孔２４を通って、高圧下の燃料は、リング室２６を介して、ノズル体１０の縦孔１１に到達して、弁１３，１５の開放状態で、ノズル流出口１２に到達する。   As can be further understood from FIG. 1, a high-pressure passage 21 is formed in the servo valve body 18, and the high-pressure passage 21 is similarly not shown through a high-pressure connection portion (not shown). Common rail) and hydraulic type. The high-pressure passage 21 opens at the lower end surface 23 of the servo valve body 18 through the expansion portion 22, and is hydraulically coupled to the two holes 24 and 25 formed in the closing portion 17 there. . Through the first hole 24, the fuel under high pressure reaches the vertical hole 11 of the nozzle body 10 via the ring chamber 26, and reaches the nozzle outlet 12 with the valves 13 and 15 opened. .

第２の孔２５の特別な構成によれば、第２の孔２５は、絞り孔（いわゆる流入絞り）２７に向かって段状に狭窄されている。流入絞り２７を介して燃料は制御室２８に到達する。制御室２８はノズルニードル１４の上位端部と閉鎖部１７の下位端面２９との間で延びている。制御室２８は、図１および図２に示したノズルニードル１４の閉鎖位置で最大容量を占め、この場合ノズルニードル１４は円錐形の端部１５で弁座１３に接触している。この閉鎖位置では、ノズルニードル１４は、一方では制御室２８に作用する液圧によって、また他方では押圧ばね３０によって保持される。ここでは押圧ばね３０は、上位端部で、ノズルニードル１４の上位端部を緊密に取り囲むスリーブ部３１介して、閉鎖部１７の下位端面２９に支持される。押圧ばね３０は、矢印方向３２に向けられた閉鎖力を、ノズルニードル１４の段部３４に支持された別のスリーブ部３３を介して、ノズルニードル１４に及ぼす。   According to the special configuration of the second hole 25, the second hole 25 is narrowed stepwise toward the throttle hole (so-called inflow throttle) 27. The fuel reaches the control chamber 28 via the inflow restrictor 27. The control chamber 28 extends between the upper end portion of the nozzle needle 14 and the lower end surface 29 of the closing portion 17. The control chamber 28 occupies the maximum capacity in the closed position of the nozzle needle 14 shown in FIGS. 1 and 2, where the nozzle needle 14 is in contact with the valve seat 13 at the conical end 15. In this closed position, the nozzle needle 14 is held on the one hand by the hydraulic pressure acting on the control chamber 28 and on the other hand by the pressure spring 30. Here, the pressing spring 30 is supported on the lower end surface 29 of the closing portion 17 through the sleeve portion 31 that tightly surrounds the upper end portion of the nozzle needle 14 at the upper end portion. The pressing spring 30 exerts a closing force directed in the arrow direction 32 on the nozzle needle 14 via another sleeve portion 33 supported by the step portion 34 of the nozzle needle 14.

閉鎖部１７内に別の孔３５が形成されており、この孔３５は、一方では孔２４およびリング室２６を介して高圧筒路２１とハイドロリック式に作用結合されていて、また他方では絞り孔（いわゆる流出絞り）３６を介してサーボ弁１９とハイドロリック式に作用結合されている。   Another hole 35 is formed in the closure 17, which is connected hydraulically to the high-pressure cylinder 21 on the one hand via the hole 24 and the ring chamber 26, and on the other hand to the throttle. The servo valve 19 is hydraulically coupled to the servo valve 19 through a hole (so-called outflow restrictor) 36.

図示の実施例の別の格別な構成によれば、ノズルニードル１４の背面側の（上位の）端面３７が、球状の湾曲部を有している。球半径は、図１および図２においてｒｋｕｇｅｌで示した。球面３７の頂点Ｐ（図２参照）によって、対抗ストッパとしての閉鎖部１７の面２９と協働する、ノズルニードル１４の上位の当接部が特定される。したがってノズルニードル１４の閉鎖位置（図１および図２参照）から出発して、図２においてｈＤＮで示したノズルニードルストロークが形成される。したがって（上位の）開放位置で、ノズルニードル１４は、頂点Ｐで、閉鎖部１７の面２９に当接する。ノズルニードル１４の端面３７の球状／ボール状の構造に基づいて達成される、閉鎖部１７の当接面２９に対するノズルニードル１４の（大きな）面状の当接の回避によって、別の構造では起こり得る、（上位の）開放位置でのノズルニードル１４の「付着（Kleben）」が防止される。さらに球状／ボール状のノズルニードル端面３７によって、ノズルニードル１４の開放位置でも、依然として十分に大きな制御室２８が残る。したがって結果として生じるほぼ点状のノズルニードル当接部を備えたノズルニードル端面３７の球状／ボール状の構造によって、場合によっては起こり得るノズルニードル１４の回動が生じる場合でも、または製作誤差に起因するノズルニードルの傾斜姿勢が生じる場合でも、ノズルニードルストロークｈＤＮは常に一定である、という利点が得られる。 According to another particular configuration of the illustrated embodiment, the (upper) end surface 37 on the back side of the nozzle needle 14 has a spherical curved portion. The sphere radius is indicated by r kugel in FIGS. The apex P (see FIG. 2) of the spherical surface 37 identifies the upper contact portion of the nozzle needle 14 that cooperates with the surface 29 of the closing portion 17 as a counter stopper. Thus, starting from the closed position of the nozzle needle 14 (see FIGS. 1 and 2), a nozzle needle stroke indicated by hDN in FIG. 2 is formed. Thus, in the (upper) open position, the nozzle needle 14 abuts the surface 29 of the closure 17 at the apex P. Another structure occurs by avoiding the (large) planar contact of the nozzle needle 14 against the contact surface 29 of the closure 17, which is achieved based on the spherical / ball-shaped structure of the end surface 37 of the nozzle needle 14. The resulting “kleben” of the nozzle needle 14 in the (upper) open position is prevented. Further, the spherical / ball-shaped nozzle needle end surface 37 still leaves a sufficiently large control chamber 28 even at the open position of the nozzle needle 14. Therefore, the resulting spherical / ball-shaped structure of the nozzle needle end surface 37 with the substantially point-shaped nozzle needle contact portion may cause the rotation of the nozzle needle 14 which may occur in some cases, or due to manufacturing errors. Even when the inclined posture of the nozzle needle occurs, the advantage that the nozzle needle stroke h DN is always constant can be obtained.

ＣＲインジェクタの１実施例を示す縦断面図である。It is a longitudinal cross-sectional view which shows one Example of CR injector. 図１のＡで示した部分の拡大図である。It is an enlarged view of the part shown by A of FIG.

符号の説明Explanation of symbols

１０ ノズル体、 １１ 縦孔、 １２ ノズル流出口、 １３ 弁座、 １４ ノズルニードル、 １５ 端部、 １６ 端面、 １７ 閉鎖部、 １８ サーボ弁体、 １９ サーボ弁、 ２０ インジェクタケーシング、 ２１ 高圧通路、 ２２ 拡張部、 ２３ 端面、 ２４，２５ 孔、 ２６ リング室、 ２７ 絞り孔、 ２８ 制御室、 ２９ 端面、 ３０ 押圧ばね、 ３１ スリーブ部、 ３２ 矢印方向、 ３３ スリーブ部、 ３４ 段部、 ３５ 孔、 ３６ 絞り孔、 ３７ 端面   DESCRIPTION OF SYMBOLS 10 Nozzle body, 11 Vertical hole, 12 Nozzle outflow port, 13 Valve seat, 14 Nozzle needle, 15 End part, 16 End surface, 17 Closure part, 18 Servo valve body, 19 Servo valve, 20 Injector casing, 21 High pressure passage, 22 Expansion part, 23 end face, 24, 25 hole, 26 ring chamber, 27 throttle hole, 28 control chamber, 29 end face, 30 pressure spring, 31 sleeve part, 32 arrow direction, 33 sleeve part, 34 step part, 35 hole, 36 Diaphragm hole, 37 end face

Claims (4)

内燃機関の燃焼室に燃料を噴射するためのインジェクタ、特にサーボ弁制御式のコモンレールインジェクタであって、
ノズル体（１０）が設けられており、該ノズル体（１０）の燃焼室側の自由な端部にノズル流出口（１２）が形成されており、
ノズルニードル（１４）が設けられており、該ノズルニードル（１４）が、ノズル体（１０）の縦孔（１１）内で軸方向運動可能もしくは軸方向作動可能に配置されており、
縦孔（１１）の、ノズル流出口（１２）とは反対側の後方の端部を閉鎖する、上方でノズル体（１０）に隣接する閉鎖部（１７）が設けられており、該閉鎖部（１７）が、ノズルニードル（１４）のための開放ストッパ（２９）を形成しており、閉鎖部（１７）が、ノズルニードル（１４）の、ノズル流出口（１２）とは反対側の背面側の端面（３７）と協働して、ノズルニードル（１４）の開放ストローク（ｈＤＮ）を制限するようになっており、
後方のノズルニードル端面（３７）と閉鎖部（１７）との間に形成された制御室（２８）が設けられており、該制御室（２８）が、燃料供給に役立つ圧力接続部（２１）とハイドロリック式に結合されている形式のものにおいて、
ノズルニードル（１４）の背面側の端面（３７）および／または閉鎖部（１７）の、該端面（３７）と協働する当接面（２９）が、次のように形成されており、つまりノズルニードル（１４）の開放位置で、背面側のノズルニードル端面（３７）と閉鎖部（１７）の当接面（２９）との間で点状または実質的に点状の接触面（Ｐ）が生じるように、形成されていることを特徴とする、内燃機関の燃焼室に燃料を噴射するためのインジェクタ。 An injector for injecting fuel into a combustion chamber of an internal combustion engine, in particular, a servo valve control type common rail injector,
A nozzle body (10) is provided, and a nozzle outlet (12) is formed at a free end of the nozzle body (10) on the combustion chamber side,
A nozzle needle (14) is provided, and the nozzle needle (14) is arranged so as to be axially movable or axially operable in the vertical hole (11) of the nozzle body (10),
A closing part (17) adjacent to the nozzle body (10) above is provided, which closes the rear end of the longitudinal hole (11) opposite to the nozzle outlet (12). (17) forms an open stopper (29) for the nozzle needle (14), and the closure (17) is the back of the nozzle needle (14) opposite the nozzle outlet (12). In cooperation with the end face (37) on the side, the opening stroke (h DN ) of the nozzle needle (14) is limited,
A control chamber (28) formed between the rear nozzle needle end face (37) and the closing portion (17) is provided, and the control chamber (28) serves as a pressure connection (21) useful for fuel supply. And in a form that is combined in a hydraulic manner,
A contact surface (29) cooperating with the end surface (37) of the back surface side end surface (37) and / or the closing portion (17) of the nozzle needle (14) is formed as follows. A point-like or substantially point-like contact surface (P) between the nozzle needle end surface (37) on the back side and the contact surface (29) of the closing portion (17) at the open position of the nozzle needle (14). An injector for injecting fuel into a combustion chamber of an internal combustion engine, characterized in that 閉鎖部（１７）の、背面側のノズルニードル端面（３７）と協働する当接面（２９）が、平面状に形成されており、ノズルニードル（１４）が、ボール状に形成された背面側の端面（３７）を備えている、請求項１記載のインジェクタ。   A contact surface (29) that cooperates with the nozzle needle end surface (37) on the back surface side of the closing portion (17) is formed in a planar shape, and the back surface in which the nozzle needle (14) is formed in a ball shape. 2. Injector according to claim 1, comprising a side end face (37). ノズルニードル（１４）の背面側の端面（３７）が、球状に形成されている、請求項１または２記載のインジェクタ。   The injector according to claim 1 or 2, wherein an end surface (37) on the back side of the nozzle needle (14) is formed in a spherical shape. 背面側のノズルニードル端面（３７）の半径（ｒｋｕｇｅｌ）が、閉鎖部（１７）の当接面（２９）と接触する位置で、ノズルニードル（１４）に作用する開放力を考慮して、許容ヘルツ応力を超えないように、寸法設定されている、請求項１から３までのいずれか１項記載のインジェクタ。 Considering the opening force acting on the nozzle needle (14) at a position where the radius (r kugel ) of the nozzle needle end surface (37) on the back side contacts the contact surface (29) of the closing portion (17), 4. An injector according to claim 1, wherein the injector is dimensioned so as not to exceed an allowable Hertz stress.
JP2004534955A 2002-09-06 2003-06-26 Injector for injecting fuel into the combustion chamber of an internal combustion engine, especially a common rail injector with servo valve control Withdrawn JP2005538296A (en)

Applications Claiming Priority (2)

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DE10241462A DE10241462A1 (en) 2002-09-06 2002-09-06 Fuel injector for internal combustion engines has end face of nozzle needle and/or stop face of shut-off component interacting with it constructed so that in open position of nozzle needle point-form contact face is formed between them
PCT/DE2003/002129 WO2004025114A1 (en) 2002-09-06 2003-06-26 Injector, especially a common rail injector controlled by a servo valve, for injecting fuel into the combustion chambers of internal combustion engines

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JP2005538296A true JP2005538296A (en) 2005-12-15

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KR100835159B1 (en) * 2006-05-23 2008-06-04 아이상 고교 가부시키가이샤 Fuel injection device
JP2011508853A (en) * 2008-01-07 2011-03-17 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Fuel injector

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AT500774B8 (en) 2004-08-06 2007-02-15 Bosch Gmbh Robert DEVICE FOR INJECTING FUEL IN THE COMBUSTION ENGINE OF AN INTERNAL COMBUSTION ENGINE
FR2965018A1 (en) * 2010-09-20 2012-03-23 Renault Sas DYNAMIC LEAK INJECTOR REDUCED
CN102330627A (en) * 2011-10-16 2012-01-25 中国兵器工业集团第七0研究所 Oil nozzle for common rail injector of flat dual-opposed diesel engine
DE102014221586A1 (en) * 2014-10-23 2016-04-28 Robert Bosch Gmbh fuel injector
CN106677945B (en) * 2016-07-12 2019-07-05 江西汇尔油泵油嘴有限公司 The atomizer of oil spout and stage by stage fuel injecting method stage by stage
FR3057623B1 (en) * 2016-10-14 2020-12-25 Delphi Int Operations Luxembourg Sarl FUEL INJECTOR VALVE MEMBER
CN112431699B (en) * 2020-11-12 2021-12-24 一汽解放汽车有限公司 Matching parts high pressure flow measuring device of long needle valve fuel sprayer

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DE19849933C2 (en) * 1998-10-29 2000-09-28 Siemens Ag Actuating arrangement, in particular for the mechanical control of an injection valve of an internal combustion engine
US6471142B1 (en) * 1999-04-01 2002-10-29 Delphi Technologies, Inc. Fuel injector
DE19936668A1 (en) * 1999-08-04 2001-02-22 Bosch Gmbh Robert Common rail injector
DE10020166A1 (en) * 2000-04-25 2001-10-31 Bosch Gmbh Robert Nozzle needle stroke adjustment on injectors of injection systems

Cited By (2)

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Publication number Priority date Publication date Assignee Title
KR100835159B1 (en) * 2006-05-23 2008-06-04 아이상 고교 가부시키가이샤 Fuel injection device
JP2011508853A (en) * 2008-01-07 2011-03-17 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Fuel injector

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