JP2010249103A - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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JP2010249103A
JP2010249103A JP2009102287A JP2009102287A JP2010249103A JP 2010249103 A JP2010249103 A JP 2010249103A JP 2009102287 A JP2009102287 A JP 2009102287A JP 2009102287 A JP2009102287 A JP 2009102287A JP 2010249103 A JP2010249103 A JP 2010249103A
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needle
fuel
pressure
fuel injection
receiving surface
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JP5257216B2 (en
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Yuki Haba
優樹 羽場
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Toyota Motor Corp
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Toyota Motor Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel injection valve capable of stabilizing behavior of a needle. <P>SOLUTION: This fuel injection valve includes a nozzle body including an injection hole 6 disposed at a tip and a high pressure fuel passage 26 supplying fuel to the tip, a piezoelectric stack disposed in the nozzle body, a needle 10 including a seat 10b slidably disposed in the nozzle body and seated on the nozzle body in a valve close state and a pressure receiving surface 10c receiving pressure biasing the same from the high pressure fuel passage 26 to the tip side, and a second oil tight chamber 22 applying pressure on the needle 10 in a valve open direction according to the action of the piezoelectric stack. The diameter of the seat 10b and diameter of the pressure receiving surface 10c are same. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は燃料噴射弁に関する。   The present invention relates to a fuel injection valve.

内燃機関のコモンレール式燃料噴射装置では、ニードルを動作させることにより燃料噴射弁の噴孔の開閉を行い、コモンレール内の燃料を噴射する。燃料噴射弁の開閉状態を制御するアクチュエータとして、電圧の印加により伸縮するピエゾスタックが用いられることがある。   In a common rail fuel injection device for an internal combustion engine, a nozzle is opened and closed by operating a needle to inject fuel in the common rail. As an actuator that controls the open / close state of the fuel injection valve, a piezo stack that expands and contracts by application of a voltage may be used.

特許文献１には、アクチュエータの動作により変位する一次ピストンの変位を、油圧室内の油圧を介して二次ピストンに伝達する燃料噴射弁において、油圧室に油が過度に充填されることを防止することで、燃料噴射時期に誤差が生じることを抑制する技術が開示されている。   Patent Document 1 discloses that in a fuel injection valve that transmits the displacement of a primary piston that is displaced by the operation of an actuator to a secondary piston via the hydraulic pressure in the hydraulic chamber, the hydraulic chamber is prevented from being excessively filled with oil. Thus, a technique for suppressing the occurrence of an error in the fuel injection timing is disclosed.

特開２００３−３１４３９７号公報JP 2003-31497 A

しかしながら、ニードルの背面にはコモンレール内の燃料から圧力が加わっているため、コモンレール内の燃料に生じた圧力脈動が、ニードルに伝わることがある。圧力脈動がニードルに伝わると、ニードルの挙動が不安定になることがあり、ニードルのリフト量が安定しないため、燃料噴射弁からの燃料の噴射も不安定となる。   However, since pressure is applied from the fuel in the common rail to the back surface of the needle, pressure pulsation generated in the fuel in the common rail may be transmitted to the needle. When the pressure pulsation is transmitted to the needle, the behavior of the needle may become unstable, and the lift amount of the needle is not stable, so that the fuel injection from the fuel injection valve is also unstable.

本発明は、上記課題に鑑み、ニードルの挙動の安定化が可能な燃料噴射弁を提供することを課題とする。   In view of the above problems, an object of the present invention is to provide a fuel injection valve capable of stabilizing the behavior of a needle.

本発明は、先端部に設けられた噴孔と、前記先端部に燃料を供給する燃料通路とを備えたノズルボディと、前記ノズルボディ内に配置されたアクチュエータと、前記ノズルボディ内に摺動自在に配置され、閉弁状態において前記ノズルボディに着座するシート部と、前記燃料通路から前記先端側に付勢する圧力を受ける第１受圧面とを備えたニードルと、前記アクチュエータの動作に応じて、前記ニードルに開弁方向の圧力を作用させる開弁手段と、を具備し、前記シート部の径と、前記第１受圧面の径とは同一であることを特徴とする燃料噴射弁である。本発明によれば、ニードルが圧力脈動の影響を受けにくいため、ニードルの挙動の安定化が可能な燃料噴射弁を提供することができる。   The present invention relates to a nozzle body provided with a nozzle hole provided in a tip portion, a fuel passage for supplying fuel to the tip portion, an actuator disposed in the nozzle body, and a slide in the nozzle body A needle having a seat portion that is freely arranged and is seated on the nozzle body in a valve-closed state, a first pressure receiving surface that receives pressure urging from the fuel passage toward the distal end side, and according to the operation of the actuator And a valve opening means for applying a pressure in the valve opening direction to the needle, wherein the diameter of the seat portion and the diameter of the first pressure receiving surface are the same. is there. According to the present invention, since the needle is hardly affected by pressure pulsation, a fuel injection valve capable of stabilizing the behavior of the needle can be provided.

上記構成において、前記ニードルは前記先端側に第２受圧面を有する受圧部を備え、前記開弁手段は、前記アクチュエータの動作に応じて、前記第２受圧面に作用する内部の燃料が昇圧する油密室を備える構成とすることができる。この構成によれば、燃料噴射弁の開弁が可能となる。   In the above configuration, the needle includes a pressure receiving portion having a second pressure receiving surface on the distal end side, and the valve opening means boosts the internal fuel acting on the second pressure receiving surface in accordance with the operation of the actuator. It can be set as the structure provided with an oil-tight chamber. According to this configuration, the fuel injection valve can be opened.

上記構成において、前記アクチュエータは、ピエゾアクチュエータである構成とすることができる。   The said structure WHEREIN: The said actuator can be set as the structure which is a piezo actuator.

本発明によれば、ニードルの挙動の安定化が可能な燃料噴射弁を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the fuel injection valve which can stabilize the behavior of a needle can be provided.

図１は実施例１に係る燃料噴射弁１００を例示する断面図である。FIG. 1 is a cross-sectional view illustrating a fuel injection valve 100 according to the first embodiment. 図２は比較例に係る燃料噴射弁１１０のニードル１０及びその周辺を拡大して例示する断面図である。FIG. 2 is an enlarged cross-sectional view illustrating the needle 10 and its periphery of the fuel injection valve 110 according to the comparative example. 図３は実施例１に係る燃料噴射弁１００のニードル１０及びその周辺を拡大して例示する断面図である。FIG. 3 is an enlarged cross-sectional view illustrating the needle 10 and its periphery of the fuel injection valve 100 according to the first embodiment. 図４（ａ）及び図４（ｂ）は、鍔部が設けられていないニードル１０ｅを用いた燃料噴射弁を例示する断面図である。FIG. 4A and FIG. 4B are cross-sectional views illustrating a fuel injection valve using a needle 10e that is not provided with a flange portion.

図面を用いて、本発明の実施例について説明する。   Embodiments of the present invention will be described with reference to the drawings.

まず、実施例１に係る燃料噴射弁１００の構成について説明する。図１は実施例１に係る燃料噴射弁１００を例示する断面図である。   First, the configuration of the fuel injection valve 100 according to the first embodiment will be described. FIG. 1 is a cross-sectional view illustrating a fuel injection valve 100 according to the first embodiment.

図１に示すように、燃料噴射弁１００はＥＤＵ４を介してＥＣＵ（Ｅｎｇｉｎｅ Ｃｏｎｔｒｏｌ Ｕｎｉｔ）２と接続されている。燃料噴射弁１００は、ノズルボディ８、ニードル１０、ピエゾスタック３２とを備えている。   As shown in FIG. 1, the fuel injection valve 100 is connected to an ECU (Engine Control Unit) 2 via an EDU 4. The fuel injection valve 100 includes a nozzle body 8, a needle 10, and a piezo stack 32.

ノズルボディ８内には、基端側から先端側へ向けて順に、アクチュエータ室１２、第１ピストン室１４、第１油密室１６、第１制御室１８（制御室）、第２制御室２０、第２油密室２２、燃料溜り室２４が設けられている。第１制御室１８と燃料溜り室２４とには、高圧燃料通路２６（燃料通路）が接続されている。また、第１油密室１６と第２油密室２２とは油密通路２８により接続されている。従って、第１油密室１６、第２油密室２２及び油密通路２８では、内部の燃料の圧力が同一となる。アクチュエータ室１２、第１ピストン室１４及び第２制御室２０には、リターン通路３０が接続されている。第１ピストン室１４にはバネ１４ａ、第２制御室２０にはバネ２０ａが設けられている。燃料溜り室２４には噴孔が形成されている。   In the nozzle body 8, the actuator chamber 12, the first piston chamber 14, the first oil-tight chamber 16, the first control chamber 18 (control chamber), the second control chamber 20, in order from the proximal end side to the distal end side, A second oil-tight chamber 22 and a fuel reservoir chamber 24 are provided. A high pressure fuel passage 26 (fuel passage) is connected to the first control chamber 18 and the fuel reservoir chamber 24. The first oil-tight chamber 16 and the second oil-tight chamber 22 are connected by an oil-tight passage 28. Therefore, in the first oil-tight chamber 16, the second oil-tight chamber 22, and the oil-tight passage 28, the internal fuel pressure is the same. A return passage 30 is connected to the actuator chamber 12, the first piston chamber 14, and the second control chamber 20. The first piston chamber 14 is provided with a spring 14a, and the second control chamber 20 is provided with a spring 20a. An injection hole is formed in the fuel reservoir chamber 24.

アクチュエータ室１２にはピエゾスタック３２（アクチュエータ）が配置されている。ピエゾスタック３２の先端側に接続された第１ピストン３４は、第１ピストン室１４に配置されている。第１ピストン３４の先端側に接続された第２ピストン３６は、ノズルボディ８内に摺動自在に配置されている。また、第２ピストン３６の先端部は第１油密室１６に配置されている。   A piezo stack 32 (actuator) is disposed in the actuator chamber 12. The first piston 34 connected to the tip end side of the piezo stack 32 is disposed in the first piston chamber 14. The second piston 36 connected to the distal end side of the first piston 34 is slidably disposed in the nozzle body 8. The tip of the second piston 36 is disposed in the first oil tight chamber 16.

ニードル１０は、ノズルボディ８内に摺動自在に配置されている。ニードル１０の先端側にはテーパ部１０ａが形成されており、先端側は燃料溜り室２４に配置されている。また、閉弁状態では、ニードル１０のシート部１０ｂが、ノズルボディ８の内壁に着座する。ニードル１０の基端側の受圧面１０ｃ（第１受圧面）は第１制御室１８に配置されている。ニードル１０の先端部と基端部との間には鍔部１１（受圧部）が設けられている。鍔部１１は第２制御室２０及び第２油密室２２に配置されている。シート部１０ｂの径Ｄ１は、受圧面１０ｃの径Ｄ２と同一である。   The needle 10 is slidably disposed in the nozzle body 8. A tapered portion 10 a is formed on the distal end side of the needle 10, and the distal end side is disposed in the fuel reservoir chamber 24. In the valve closed state, the seat portion 10 b of the needle 10 is seated on the inner wall of the nozzle body 8. A pressure receiving surface 10 c (first pressure receiving surface) on the proximal end side of the needle 10 is disposed in the first control chamber 18. A flange 11 (pressure receiving portion) is provided between the distal end portion and the proximal end portion of the needle 10. The flange 11 is disposed in the second control chamber 20 and the second oil-tight chamber 22. The diameter D1 of the sheet portion 10b is the same as the diameter D2 of the pressure receiving surface 10c.

ニードル１０の受圧面１０ｃは第１制御室１８内の燃料から、ニードル１０を先端側に付勢する圧力、言い換えれば閉弁方向の圧力を受ける。また、鍔部１１の受圧面１１ａ（第２受圧面）は第２油密室２２内の燃料から、ニードル１０を基端側に付勢する圧力、言い換えれば開弁方向の圧力を受ける。また、鍔部１１は第２制御室２０に設けられたバネ２０ａからニードル１０を先端側に付勢する力、言い換えれば閉弁方向の力を受ける。   The pressure receiving surface 10c of the needle 10 receives a pressure for urging the needle 10 toward the tip, that is, a pressure in the valve closing direction, from the fuel in the first control chamber 18. Further, the pressure receiving surface 11a (second pressure receiving surface) of the flange portion 11 receives pressure for urging the needle 10 toward the proximal end from the fuel in the second oil tight chamber 22, in other words, pressure in the valve opening direction. Further, the collar portion 11 receives a force for urging the needle 10 toward the distal end side from a spring 20 a provided in the second control chamber 20, in other words, a force in the valve closing direction.

ピエゾスタック３２に電圧が印加されていない場合、閉弁方向の力（第１制御室１８内の燃料の圧力に起因する力とバネ２０ａからの力）は、開弁方向の力（第２油密室２２内の燃料の圧力に起因する力）より大きい。従って、ニードル１０の先端部のシート部１０ｂは、ノズルボディ８の内壁に着座する。このため、噴孔６への燃料の供給が遮断され、燃料噴射弁１００から燃料は噴射されない。   When no voltage is applied to the piezo stack 32, the force in the valve closing direction (the force due to the fuel pressure in the first control chamber 18 and the force from the spring 20a) is the force in the valve opening direction (the second oil Larger than the force due to the pressure of the fuel in the closed chamber 22). Therefore, the seat portion 10 b at the tip of the needle 10 is seated on the inner wall of the nozzle body 8. For this reason, the supply of fuel to the nozzle hole 6 is shut off, and fuel is not injected from the fuel injection valve 100.

ＥＣＵ２が燃料供給指令を発信すると、ＥＤＵ４はピエゾスタック３２に電圧を印加する。電圧が印加されたピエゾスタック３２は伸長し、第１ピストン３４及び第２ピストン３６が先端側に移動する。第２ピストン３６の移動により、第１油密室１６、油密通路２８及び第２油密室２２内の燃料の圧力が昇圧する。言い換えれば、ピエゾスタック３２の動作に応じて、受圧面１１ａが受ける開弁方向の圧力が昇圧する。すなわち、第１油密室１６、油密通路２８及び第２油密室２２は、ピエゾスタック３２の動作に応じて、ニードル１０に開弁方向の圧力を作用させる開弁手段として機能する。開弁方向の力が閉弁方向の力を上回ると、ニードル１０のシート部１０ｂはノズルボディ８の内壁から離座する。このとき、燃料溜り室２４内の燃料が噴孔６に供給され、燃料が噴孔６から噴射される。すなわち、燃料噴射弁１００が開弁する。   When the ECU 2 transmits a fuel supply command, the EDU 4 applies a voltage to the piezo stack 32. The piezo stack 32 to which the voltage is applied extends, and the first piston 34 and the second piston 36 move to the tip side. By the movement of the second piston 36, the pressure of the fuel in the first oil-tight chamber 16, the oil-tight passage 28 and the second oil-tight chamber 22 is increased. In other words, according to the operation of the piezo stack 32, the pressure in the valve opening direction received by the pressure receiving surface 11a is increased. That is, the first oil-tight chamber 16, the oil-tight passage 28, and the second oil-tight chamber 22 function as valve opening means that applies a pressure in the valve opening direction to the needle 10 in accordance with the operation of the piezo stack 32. When the force in the valve opening direction exceeds the force in the valve closing direction, the seat portion 10 b of the needle 10 is separated from the inner wall of the nozzle body 8. At this time, the fuel in the fuel reservoir chamber 24 is supplied to the nozzle hole 6 and the fuel is injected from the nozzle hole 6. That is, the fuel injection valve 100 is opened.

次に、比較例に係る燃料噴射弁１１０と実施例１に係る燃料噴射弁とを比較して説明する。図２は比較例に係る燃料噴射弁１１０のニードル１０及びその周辺を拡大して例示する断面図である。   Next, the fuel injection valve 110 according to the comparative example and the fuel injection valve according to the first embodiment will be described in comparison. FIG. 2 is an enlarged cross-sectional view illustrating the needle 10 and its periphery of the fuel injection valve 110 according to the comparative example.

図２に示すように、比較例に係る燃料噴射弁１１０では、ニードル１０の受圧面１０ｃの径Ｄ２が、シート部１０ｂの径Ｄ１よりも大きい。また、ニードル１０の先端部に形成されたテーパ部１０ａにおいて、シート部１０ｂよりも基端側の領域である受圧面１０ｄは、燃料溜り室２４内の燃料からニードル１０を基端側に付勢する圧力を受ける。すなわち、受圧面１０ｄは開弁方向の圧力を受ける。開弁方向の力（第２油密室２２内の燃料の圧力と燃料溜り室２４内の燃料の圧力とに起因する力）が、閉弁方向の力（第１制御室１８内の燃料の圧力に起因する力とバネ２０ａからの力）より大きい場合、シート部１０ｂはノズルボディ８の内壁から離座する。すなわち、燃料噴射弁１１０は開弁する。   As shown in FIG. 2, in the fuel injection valve 110 according to the comparative example, the diameter D2 of the pressure receiving surface 10c of the needle 10 is larger than the diameter D1 of the seat portion 10b. Further, in the tapered portion 10 a formed at the distal end portion of the needle 10, the pressure receiving surface 10 d, which is a region closer to the base end side than the seat portion 10 b, urges the needle 10 from the fuel in the fuel reservoir chamber 24 toward the base end side. Under pressure. That is, the pressure receiving surface 10d receives pressure in the valve opening direction. The force in the valve opening direction (force caused by the fuel pressure in the second oil tight chamber 22 and the fuel pressure in the fuel reservoir chamber 24) is the force in the valve closing direction (fuel pressure in the first control chamber 18). When the force is greater than the force caused by the spring 20 a and the force from the spring 20 a, the seat portion 10 b is separated from the inner wall of the nozzle body 8. That is, the fuel injection valve 110 is opened.

このとき、例えば燃料噴射弁から燃料が供給されるときなどに、高圧燃料通路２６内の燃料に圧力脈動が発生することがある。第１制御室１８内の燃料に圧力脈動が伝播すると、ニードル１０の受圧面１０ｃが受ける圧力が不安定となる。従って、ニードル１０の挙動が不安定となり、燃料噴射弁１１０からの燃料の供給も不安定となる恐れがある。   At this time, for example, when fuel is supplied from the fuel injection valve, pressure pulsation may occur in the fuel in the high-pressure fuel passage 26. When pressure pulsation propagates to the fuel in the first control chamber 18, the pressure received by the pressure receiving surface 10c of the needle 10 becomes unstable. Therefore, the behavior of the needle 10 becomes unstable, and the fuel supply from the fuel injection valve 110 may become unstable.

次に、実施例１について説明する。図３は実施例１に係る燃料噴射弁１００のニードル１０及びその周辺を拡大して例示する断面図である。   Next, Example 1 will be described. FIG. 3 is an enlarged cross-sectional view illustrating the needle 10 and its periphery of the fuel injection valve 100 according to the first embodiment.

図３に示すように、実施例１に係る燃料噴射弁１００では、ニードル１０の受圧面１０ｃの径Ｄ２が、シート部１０ｂの径Ｄ１と同一である。つまり、受圧面１０ｃの面積が比較例よりも小さくなる。すなわち、圧力脈動の影響を受ける面積が比較例よりも小さくなる。従って、実施例１によれば、圧力脈動の影響を受けにくいため、ニードル１０の挙動が安定する。これにより、燃料の供給も安定して行うことが可能となる。   As shown in FIG. 3, in the fuel injection valve 100 according to the first embodiment, the diameter D2 of the pressure receiving surface 10c of the needle 10 is the same as the diameter D1 of the seat portion 10b. That is, the area of the pressure receiving surface 10c is smaller than that of the comparative example. That is, the area affected by pressure pulsation is smaller than that of the comparative example. Therefore, according to Example 1, since it is hard to receive the influence of a pressure pulsation, the behavior of the needle 10 is stabilized. As a result, the fuel can be supplied stably.

また、ニードル１０には鍔部１１が設けられ、鍔部１１の受圧面１１ａが第２油密室２２内の燃料の圧力を受ける。このため、シート部１０ｂの径Ｄ１と受圧面１０ｃの径Ｄ２とを同一にしても、ニードル１０は開弁方向の力を受け、押し上げられる。この点について、図面を用いて説明する。   Further, the needle 10 is provided with a flange 11, and the pressure receiving surface 11 a of the flange 11 receives the pressure of the fuel in the second oil tight chamber 22. For this reason, even if the diameter D1 of the seat portion 10b and the diameter D2 of the pressure receiving surface 10c are the same, the needle 10 receives a force in the valve opening direction and is pushed up. This point will be described with reference to the drawings.

図４（ａ）は鍔部が設けられていないニードル１０ｅにおいて、受圧面１０ｃの径Ｄ２がシート部１０ｂの径Ｄ１より大きい例を示す断面図である。図４（ｂ）はニードル１０ｅにおいて、受圧面１０ｃの径Ｄ２がシート部１０ｂの径Ｄ１と同一である例を示す断面図である。   FIG. 4A is a cross-sectional view showing an example in which the diameter D2 of the pressure receiving surface 10c is larger than the diameter D1 of the seat portion 10b in the needle 10e not provided with the flange portion. FIG. 4B is a cross-sectional view showing an example in which the diameter D2 of the pressure receiving surface 10c is the same as the diameter D1 of the seat portion 10b in the needle 10e.

図４（ａ）に示すように、ニードル１０ｅは第１制御室１８内の燃料及び第１制御室内に設けられたバネ１８ａから、閉弁方向の力を受ける。また、ニードル１０ｅの受圧面１０ｄは、燃料溜り室２４内の燃料から開弁方向の力を受ける。このため、第１制御室１８内の燃料の圧力が低下すると、ニードル１０ｅは燃料溜り室２４内の燃料の圧力により押し上げられる。   As shown in FIG. 4A, the needle 10e receives force in the valve closing direction from the fuel in the first control chamber 18 and the spring 18a provided in the first control chamber. Further, the pressure receiving surface 10 d of the needle 10 e receives force in the valve opening direction from the fuel in the fuel reservoir chamber 24. For this reason, when the fuel pressure in the first control chamber 18 decreases, the needle 10 e is pushed up by the fuel pressure in the fuel reservoir chamber 24.

図４（ｂ）に示すように、受圧面１０ｃの径Ｄ２がシート部１０ｂの径Ｄ１と同一となると、ニードル１０ｅ先端側の受圧面１０ｄの面積が大幅に小さくなる。または受圧面１０ｄが存在しなくなる。このとき、ニードル１０ｅには開弁方向の圧力が加わり難くなるため、燃料噴射弁の開弁が困難となる。   As shown in FIG. 4B, when the diameter D2 of the pressure receiving surface 10c is the same as the diameter D1 of the seat portion 10b, the area of the pressure receiving surface 10d on the tip side of the needle 10e is significantly reduced. Alternatively, the pressure receiving surface 10d does not exist. At this time, since it is difficult to apply pressure in the valve opening direction to the needle 10e, it is difficult to open the fuel injection valve.

これに対し、図１及び図３に示した実施例１では、ニードル１０に鍔部１１が設けられ、ピエゾスタック３２の動作に応じて、受圧面１１ａが第２油密室２２内の燃料から受ける開弁方向の圧力が増大し、ニードル１０は押し上げられる。このため、テーパ部１０ａに受圧面１０ｄがない、または受圧面１０ｄの面積が微小であっても、燃料噴射弁の開弁が可能となる。   On the other hand, in the first embodiment shown in FIGS. 1 and 3, the needle 10 is provided with the flange portion 11, and the pressure receiving surface 11 a receives from the fuel in the second oil tight chamber 22 according to the operation of the piezo stack 32. The pressure in the valve opening direction increases, and the needle 10 is pushed up. For this reason, even if the taper portion 10a does not have the pressure receiving surface 10d or the pressure receiving surface 10d has a small area, the fuel injection valve can be opened.

実施例１では、ニードル１０の受圧面１０ｃの径Ｄ２がシート部１０ｂの径Ｄ１と同一としたが、これに限定されない。Ｄ２が小さくなると、その分圧力脈動の影響も小さくなる。例えばＤ２がＤ１の１．２倍である場合より、１．１倍である場合の方が圧力脈動の影響は小さい。さらに、Ｄ２をＤ１の１．０５倍、１．０１倍とすることにより、圧力脈動の影響を小さくできる。しかしながら、Ｄ２がＤ１よりも小さくなると、閉弁方向の圧力を受ける面積が小さくなり、燃料噴射弁１００の閉弁が困難となる可能性がある。このため、Ｄ２はＤ１と同一とすることが好ましい。   In the first embodiment, the diameter D2 of the pressure receiving surface 10c of the needle 10 is the same as the diameter D1 of the seat portion 10b, but is not limited thereto. As D2 is reduced, the influence of pressure pulsation is reduced accordingly. For example, the effect of pressure pulsation is smaller when D2 is 1.1 times than when D2 is 1.2 times D1. Furthermore, the influence of pressure pulsation can be reduced by making D2 1.05 times and 1.01 times D1. However, if D2 is smaller than D1, the area receiving the pressure in the valve closing direction is reduced, and it may be difficult to close the fuel injection valve 100. For this reason, D2 is preferably the same as D1.

実施例１では、アクチュエータとしてピエゾスタックを用いたが、ピエゾスタック以外のピエゾアクチュエータを用いてもよい。また、ピエゾアクチュエータ以外のアクチュエータを用いてもよい。   In the first embodiment, the piezo stack is used as the actuator, but a piezo actuator other than the piezo stack may be used. An actuator other than the piezoelectric actuator may be used.

以上、本発明の実施例について詳述したが、本発明はかかる特定の実施例に限定されるものではなく、特許請求の範囲に記載された本発明の要旨の範囲内において、種々の変形・変更が可能である。   Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. It can be changed.

ＥＣＵ ２
ＥＤＵ ４
噴孔 ６
ノズルボディ ８
ニードル １０、１０ｅ
シート部 １０ｂ
受圧面 １０ｃ、１０ｄ、１１ａ
鍔部 １１
第１油密室 １６
第２油密室 ２２
燃料溜り室 ２４
高圧燃料通路 ２６
油密通路 ２８
リターン通路 ３０
ピエゾスタック ３２
燃料噴射弁 １００ ECU 2
EDU 4
Hole 6
Nozzle body 8
Needle 10, 10e
Seat part 10b
Pressure receiving surface 10c, 10d, 11a
Isobe 11
First oiltight chamber 16
Second oiltight chamber 22
Fuel reservoir 24
High pressure fuel passage 26
Oil tight passage 28
Return passage 30
Piezo stack 32
Fuel injection valve 100

Claims (3)

先端部に設けられた噴孔と、前記先端部に燃料を供給する燃料通路とを備えたノズルボディと、
前記ノズルボディ内に配置されたアクチュエータと、
前記ノズルボディ内に摺動自在に配置され、閉弁状態において前記ノズルボディに着座するシート部と、前記燃料通路から前記先端側に付勢する圧力を受ける第１受圧面とを備えたニードルと、
前記アクチュエータの動作に応じて、前記ニードルに開弁方向の圧力を作用させる開弁手段と、を具備し、
前記シート部の径と、前記第１受圧面の径とは同一であることを特徴とする燃料噴射弁。 A nozzle body provided with a nozzle hole provided at the tip, and a fuel passage for supplying fuel to the tip;
An actuator disposed in the nozzle body;
A needle that is slidably disposed in the nozzle body and includes a seat portion that is seated on the nozzle body in a valve-closed state, and a first pressure receiving surface that receives pressure urging from the fuel passage toward the tip side; ,
Valve opening means for applying a pressure in the valve opening direction to the needle in accordance with the operation of the actuator,
The fuel injection valve characterized in that the diameter of the seat portion and the diameter of the first pressure receiving surface are the same. 前記ニードルは前記先端側に第２受圧面を有する受圧部を備え、
前記開弁手段は、前記アクチュエータの動作に応じて、前記第２受圧面に作用する内部の燃料が昇圧する油密室を備えることを特徴とする請求項１記載の燃料噴射弁。 The needle includes a pressure receiving portion having a second pressure receiving surface on the tip side,
2. The fuel injection valve according to claim 1, wherein the valve opening means includes an oil-tight chamber in which internal fuel acting on the second pressure receiving surface is boosted in accordance with the operation of the actuator. 前記アクチュエータは、ピエゾアクチュエータであることを特徴とする請求項１記載の燃料噴射弁。   The fuel injection valve according to claim 1, wherein the actuator is a piezo actuator.
JP2009102287A 2009-04-20 2009-04-20 Fuel injection valve Expired - Fee Related JP5257216B2 (en)

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KR101165541B1 (en) 2010-12-28 2012-07-16 현대중공업 주식회사 Electronic control fuel injection valve
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Cited By (12)

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Publication number Priority date Publication date Assignee Title
KR101165541B1 (en) 2010-12-28 2012-07-16 현대중공업 주식회사 Electronic control fuel injection valve
WO2012091393A3 (en) * 2010-12-28 2012-08-23 현대중공업 주식회사 Electronically controlled fuel injection valve
WO2012091367A3 (en) * 2010-12-28 2012-08-23 현대중공업 주식회사 Electronically controlled fuel injection valve
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US9394849B2 (en) 2010-12-28 2016-07-19 Hyundai Heavy Industries, Co., Ltd. Electronically controlled fuel injection valve

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