JP4682979B2 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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JP4682979B2
JP4682979B2 JP2006356385A JP2006356385A JP4682979B2 JP 4682979 B2 JP4682979 B2 JP 4682979B2 JP 2006356385 A JP2006356385 A JP 2006356385A JP 2006356385 A JP2006356385 A JP 2006356385A JP 4682979 B2 JP4682979 B2 JP 4682979B2
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back pressure
pressure chamber
fuel
valve
chamber
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JP2008163903A (en
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健治 伊達
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Denso Corp
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Denso Corp
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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
    • 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
    • F02M47/025—Hydraulically 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
    • 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
    • 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
    • F02M63/0028—Valves characterised by the valve actuating means hydraulic
    • F02M63/0029—Valves characterised by the valve actuating means hydraulic using a pilot valve controlling a hydraulic chamber
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0045—Three-way valves

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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)

Description

本発明は、エンジンに燃料を噴射供給する燃料噴射弁に関する。   The present invention relates to a fuel injection valve that injects and supplies fuel to an engine.

〔従来の技術〕
従来から、燃料をエンジンに噴射して供給する燃料噴射弁が公知である。
この燃料噴射弁は、噴孔を開閉するノズルニードルを備え、ノズルニードルの一端に第１背圧室を形成している。そして、この第１背圧室を所定の制御弁により開閉することで、第１背圧室の燃料圧を増減してノズルニードルを駆動し、噴孔を開閉する。 [Conventional technology]
2. Description of the Related Art Conventionally, fuel injection valves that supply fuel by injecting it into an engine are known.
The fuel injection valve includes a nozzle needle that opens and closes a nozzle hole, and forms a first back pressure chamber at one end of the nozzle needle. The first back pressure chamber is opened and closed by a predetermined control valve to increase or decrease the fuel pressure in the first back pressure chamber to drive the nozzle needle and open and close the nozzle hole.

ところで、制御弁を駆動するための駆動力は電動アクチュエータから得られるが、近年の噴射圧の高圧力化に伴い、より大きい駆動力が要求されるようになっている。このため、電動アクチュエータを高性能にする必要があり、結果的に燃料噴射弁のコストが高くなっている。
そこで、高性能の電動アクチュエータの使用を回避するために、制御弁の動作により駆動されるサーボ弁を配し、第１背圧室をサーボ弁により開閉する技術が開示されている（特許文献１）。 By the way, the driving force for driving the control valve can be obtained from an electric actuator. However, with the recent increase in the injection pressure, a larger driving force is required. For this reason, it is necessary to make the electric actuator have high performance, and as a result, the cost of the fuel injection valve is increased.
Therefore, in order to avoid the use of a high-performance electric actuator, a technique is disclosed in which a servo valve driven by the operation of a control valve is provided and the first back pressure chamber is opened and closed by the servo valve (Patent Document 1). ).

つまり、特許文献１に記載の燃料噴射弁１００は、一端に第１背圧室１０１を形成し、この第１背圧室１０１の燃料圧の増減により噴孔を開閉するノズルニードル１０２と、一端に第２背圧室１０３を形成し、他端に第１背圧室１０１に接続する第１連通流路１０４、高圧流路１０５に通じる第１流入流路１０７、および低圧流路１０９へ通じる第１流出流路１１０が接続する弁室１１２を形成するサーボ弁１１５と、第２背圧室１０３に接続するとともに低圧流路１０９に通じる第２流出流路１１７を、ソレノイドコイルへの通電に応じて開閉する制御弁１１８とを備える（図６参照）。また、サーボ弁１１５には、弁室１１２と第２背圧室１０３とを連通し、高圧流路１０５から第２背圧室１０３に燃料を導く昇圧流路１２０が設けられている。なお、高圧流路１０５は高圧燃料源に通じており、低圧流路１０９は燃料のリターン流路に通じている。   That is, the fuel injection valve 100 described in Patent Document 1 has a first back pressure chamber 101 formed at one end, a nozzle needle 102 that opens and closes an injection hole by increasing or decreasing the fuel pressure in the first back pressure chamber 101, and one end. The second back pressure chamber 103 is formed at the other end, and the other end communicates with the first communication channel 104 connected to the first back pressure chamber 101, the first inflow channel 107 leading to the high pressure channel 105, and the low pressure channel 109. The servo valve 115 forming the valve chamber 112 to which the first outflow passage 110 is connected and the second outflow passage 117 connected to the second back pressure chamber 103 and leading to the low pressure passage 109 are used to energize the solenoid coil. And a control valve 118 that opens and closes accordingly (see FIG. 6). Further, the servo valve 115 is provided with a pressure increasing flow path 120 that communicates the valve chamber 112 and the second back pressure chamber 103 and guides fuel from the high pressure flow path 105 to the second back pressure chamber 103. The high-pressure channel 105 communicates with a high-pressure fuel source, and the low-pressure channel 109 communicates with a fuel return channel.

そして、サーボ弁１１５は、制御弁１１８による第２背圧室１０３と低圧流路１０９との間の開閉に伴う第２背圧室１０３の燃料圧の増減によって、一端側又は他端側へ変位し、第１連通流路１０４と第１流入流路１０７とが連通する閉状態（図６（ａ）参照）と、第１連通流路１０４と第１流出流路１１０とが連通する開状態（図６（ｂ）参照）とを切り替える。   The servo valve 115 is displaced to one end side or the other end side by increasing or decreasing the fuel pressure in the second back pressure chamber 103 when the control valve 118 opens and closes between the second back pressure chamber 103 and the low pressure passage 109. The closed state (see FIG. 6A) in which the first communication channel 104 and the first inflow channel 107 communicate with each other, and the open state in which the first communication channel 104 and the first outflow channel 110 communicate with each other. (See FIG. 6B).

すなわち、ソレノイドコイルへの通電が開始し、制御弁１１８が第２流出流路１１７を開放すると、第２流出流路１１７を介して第２背圧室１０３から燃料が低圧流路１０９へリークするため、第２背圧室１０３の燃料圧が低下し、サーボ弁１１５が一端側に変位して開状態となる。これにより、第１連通流路１０４、弁室１１２、および第１流出流路１１０を介して燃料が第１背圧室１０１から低圧流路１０９へリークするため、第１背圧室１０１の燃料圧が低下し、ノズルニードル１０２が一端側に変位して噴孔を開放する。   That is, when energization to the solenoid coil is started and the control valve 118 opens the second outflow passage 117, the fuel leaks from the second back pressure chamber 103 to the low pressure passage 109 through the second outflow passage 117. Therefore, the fuel pressure in the second back pressure chamber 103 decreases, and the servo valve 115 is displaced to one end side to be in an open state. As a result, the fuel leaks from the first back pressure chamber 101 to the low pressure channel 109 via the first communication channel 104, the valve chamber 112, and the first outflow channel 110, so that the fuel in the first back pressure chamber 101 The pressure drops, and the nozzle needle 102 is displaced to one end side to open the nozzle hole.

また、ソレノイドコイルへの通電が停止し、制御弁１１８が第２流出流路１１７を閉鎖すると、第１流入流路１０７、弁室１１２、および昇圧流路１２０を介して高圧流路１０５から第２背圧室１０３に燃料が流入するため、第２背圧室１０３の燃料圧が増加し、サーボ弁１１５が他端側に変位して閉状態となる。これにより、第１背圧室１０１から低圧流路１０９への燃料リークは停止し、第１流入流路１０７、弁室１１２、および第１連通流路１０４を介して第１背圧室１０１に燃料が流入するため、第１背圧室１０１の燃料圧が増加し、ノズルニードル１０２が他端側に変位して噴孔を閉鎖する。   Further, when the energization to the solenoid coil is stopped and the control valve 118 closes the second outflow passage 117, the high pressure passage 105 passes through the first inflow passage 107, the valve chamber 112, and the boost passage 120. Since the fuel flows into the two back pressure chambers 103, the fuel pressure in the second back pressure chamber 103 increases, and the servo valve 115 is displaced to the other end side to be closed. As a result, fuel leakage from the first back pressure chamber 101 to the low pressure passage 109 is stopped, and the first back pressure chamber 101 passes through the first inflow passage 107, the valve chamber 112, and the first communication passage 104. Since the fuel flows in, the fuel pressure in the first back pressure chamber 101 increases, and the nozzle needle 102 is displaced to the other end side to close the nozzle hole.

このように、燃料噴射弁１００によれば、第１背圧室１０１を開閉するサーボ弁１１５の駆動力を、主に燃料圧の増減により得ることができる。このため、高性能の電動アクチュエータを用いなくても、第１背圧室１０１を開閉して燃料を噴射することができる。   Thus, according to the fuel injection valve 100, the driving force of the servo valve 115 that opens and closes the first back pressure chamber 101 can be obtained mainly by increasing or decreasing the fuel pressure. For this reason, the fuel can be injected by opening and closing the first back pressure chamber 101 without using a high-performance electric actuator.

〔従来技術の不具合〕
しかし、燃料噴射弁１００では、サーボ弁１１５の変位に関係なく、第２背圧室１０３と高圧流路１０５との間が、昇圧流路１２０により燃料が常に流通可能となっている。このため、制御弁１１８が第２流出流路１１７を開放すると、第１流入流路１０７、弁室１１２、昇圧流路１２０、第２背圧室１０３、および第２流出流路１１７を介して燃料の高圧流路１０５と低圧流路１０９とが連通する（図６（ｂ）参照）。 [Problems with conventional technology]
However, in the fuel injection valve 100, fuel can always flow between the second back pressure chamber 103 and the high pressure flow path 105 through the pressure increase flow path 120 regardless of the displacement of the servo valve 115. For this reason, when the control valve 118 opens the second outflow passage 117, the first inflow passage 107, the valve chamber 112, the pressure increase passage 120, the second back pressure chamber 103, and the second outflow passage 117 are used. The high-pressure flow path 105 and the low-pressure flow path 109 communicate with each other (see FIG. 6B).

これにより、ノズルニードル１０２の駆動時に、第１背圧室１０１からの燃料リーク以外に、第１流入流路１０７、弁室１１２、昇圧流路１２０、第２背圧室１０３、および第２流出流路１１７を介する燃料リークが発生する。このため、燃料噴射弁１００は、高圧燃料源から高圧燃料が余分にリークし、エネルギ損失が大きい。
特開２００６−２５７８７４号公報 Thus, when the nozzle needle 102 is driven, in addition to the fuel leak from the first back pressure chamber 101, the first inflow passage 107, the valve chamber 112, the pressure increase passage 120, the second back pressure chamber 103, and the second outflow A fuel leak occurs through the flow path 117. For this reason, in the fuel injection valve 100, the high-pressure fuel leaks excessively from the high-pressure fuel source, and the energy loss is large.
JP 2006-257874 A

本発明は、上記の問題点を解決するためになされたものであり、その目的は、ソレノイドコイルへの通電に応じて開閉する制御弁、および制御弁の動作により駆動されるサーボ弁を備え、第１背圧室をサーボ弁により開閉する燃料噴射弁において、高圧燃料の余分なリークを低減することにある。   The present invention has been made in order to solve the above-described problems, and the object thereof is to include a control valve that opens and closes in response to energization of the solenoid coil, and a servo valve that is driven by the operation of the control valve. In the fuel injection valve that opens and closes the first back pressure chamber by a servo valve, an object is to reduce excessive leakage of high-pressure fuel.

〔請求項１の手段〕
請求項１に記載の燃料噴射弁は、一端に第１背圧室を形成し、この第１背圧室の燃料圧の増減により噴孔を開閉するノズルニードルと、一端に第２背圧室、および他端に弁室を形成し、第２背圧室と弁室との燃料圧の差により移動して、第１背圧室と高圧流路との間を開閉するサーボ弁と、第１背圧室と弁室との間を、燃料が常に流通可能となるように接続する第１連通流路と、電動アクチュエータへの通電により動作し、第２背圧室と低圧流路との間を開放する制御弁とを備え、電動アクチュエータの動作によりノズルニードルを駆動して噴孔を開放する燃料噴射弁である。
そして、第１背圧室と前記第２背圧室との間を燃料が常に流通可能となるように接続する第２連通流路と、第１連通流路および前記第２連通流路を含んで形成され、第２背圧室と高圧流路との間を接続し、高圧流路から第２背圧室に燃料を導く昇圧流路とを備え、制御弁の動作により第２背圧室と低圧流路との間を開放し、第２背圧室の燃料圧を低下させてサーボ弁を一端側に変位させることで昇圧流路を閉鎖する。 [Means of Claim 1]
The fuel injection valve according to claim 1 forms a first back pressure chamber at one end, a nozzle needle that opens and closes a nozzle hole by increasing or decreasing the fuel pressure in the first back pressure chamber, and a second back pressure chamber at one end. And a servo valve that forms a valve chamber at the other end, moves by the difference in fuel pressure between the second back pressure chamber and the valve chamber, and opens and closes between the first back pressure chamber and the high pressure flow path, The first communication flow path that connects the back pressure chamber and the valve chamber so that fuel can always flow, and the electric actuator is energized to operate the second back pressure chamber and the low pressure flow path. and a control valve that opens between, Ru fuel injection valve der to open the nozzle hole by driving the nozzle needle by the operation of the electric actuator.
And a second communication channel that connects the first back pressure chamber and the second back pressure chamber so that fuel can always flow, a first communication channel, and the second communication channel. in is formed, and connects the second back pressure chamber and the high-pressure line, and a boosting passage for guiding the fuel to the second back pressure chamber from the high-pressure line, the second back pressure chamber by the operation of the control valve And the low pressure flow path are opened, the fuel pressure in the second back pressure chamber is lowered, and the servo valve is displaced to one end side to close the pressure increase flow path.

これにより、制御弁が動作してノズルニードルが駆動される際、第２背圧室と低圧流路との間が開放されるとともに、第２背圧室と高圧流路との間が閉鎖される。このため、ノズルニードルの駆動時に生じていた高圧燃料の余分なリークを削除でき、エネルギ損失を低減できる。   Accordingly, when the control valve is operated to drive the nozzle needle, the space between the second back pressure chamber and the low pressure channel is opened and the space between the second back pressure chamber and the high pressure channel is closed. The For this reason, the excess leak of the high-pressure fuel which has occurred when the nozzle needle is driven can be eliminated, and the energy loss can be reduced.

〔請求項２の手段〕
請求項２に記載の燃料噴射弁は、一端に第１背圧室を形成し、この第１背圧室の燃料圧の増減により噴孔を開閉するノズルニードルと、一端に第２背圧室、および他端に弁室を形成し、第２背圧室と弁室との燃料圧の差により移動して、第１背圧室と高圧流路との間を開閉するサーボ弁と、第１背圧室と弁室との間を、燃料が常に流通可能となるように接続する第１連通流路と、電動アクチュエータへの通電により動作し、第２背圧室と低圧流路との間を開放する制御弁とを備え、電動アクチュエータの動作によりノズルニードルを駆動して噴孔を開放する燃料噴射弁である。
そして、前記弁室と前記第２背圧室との間を燃料が常に流通可能となるように接続する第３連通流路と、第３連通流路を含んで形成されて、第２背圧室と高圧流路との間を接続し、高圧流路から第２背圧室に燃料を導く昇圧流路とを備え、制御弁の動作により第２背圧室と低圧流路との間を開放し、第２背圧室の燃料圧を低下させてサーボ弁を一端側に変位させることで昇圧流路を閉鎖する。
これにより、制御弁が動作してノズルニードルが駆動される際、第２背圧室と低圧流路との間が開放されるとともに、第２背圧室と高圧流路との間が閉鎖される。このため、ノズルニードルの駆動時に生じていた高圧燃料の余分なリークを削除でき、エネルギ損失を低減できる。
また、この手段によれば、第３連通流路を設けても、第１背圧室に接続する流路の数は増えないので、第１背圧室の実質的な容積は増加しない。このため、第１背圧室の燃料圧の増減のため第１背圧室に流出入させる燃料の必要量は変動しないので、ノズルニードルによる噴孔開閉の応答性も変動しない。 [Means of claim 2 ]
According to a second aspect of the present invention, there is provided a fuel injection valve having a first back pressure chamber at one end, a nozzle needle that opens and closes an injection hole by increasing or decreasing the fuel pressure in the first back pressure chamber, and a second back pressure chamber at one end. And a servo valve that forms a valve chamber at the other end, moves by the difference in fuel pressure between the second back pressure chamber and the valve chamber, and opens and closes between the first back pressure chamber and the high pressure flow path, The first communication flow path that connects the back pressure chamber and the valve chamber so that fuel can always flow, and the electric actuator is energized to operate the second back pressure chamber and the low pressure flow path. A fuel injection valve that opens a nozzle hole by driving a nozzle needle by operation of an electric actuator.
The second back pressure chamber is formed to include a third communication channel that connects the valve chamber and the second back pressure chamber so that fuel can always flow, and a third communication channel. And a pressure increasing flow path that leads fuel from the high pressure flow path to the second back pressure chamber, and the control valve operates between the second back pressure chamber and the low pressure flow path. The pressure increase flow path is closed by opening and lowering the fuel pressure in the second back pressure chamber and displacing the servo valve to one end side.
Accordingly, when the control valve is operated to drive the nozzle needle, the space between the second back pressure chamber and the low pressure channel is opened and the space between the second back pressure chamber and the high pressure channel is closed. The For this reason, the excess leak of the high-pressure fuel which has occurred when the nozzle needle is driven can be eliminated, and the energy loss can be reduced.
Further, according to this means, even if the third communication flow path is provided, the number of flow paths connected to the first back pressure chamber does not increase, so the substantial volume of the first back pressure chamber does not increase. For this reason, since the required amount of fuel flowing into and out of the first back pressure chamber does not fluctuate in order to increase or decrease the fuel pressure in the first back pressure chamber, the responsiveness of opening and closing the nozzle hole by the nozzle needle does not fluctuate.

最良の形態１の燃料噴射弁は、一端に第１背圧室を形成し、この第１背圧室の燃料圧の増減により噴孔を開閉するノズルニードルと、一端に第２背圧室、および他端に弁室を形成し、第２背圧室と弁室との燃料圧の差により移動して、第１背圧室と高圧流路との間を開閉するサーボ弁と、第１背圧室と弁室との間を、燃料が常に流通可能となるように接続する第１連通流路と、電動アクチュエータへの通電により動作し、第２背圧室と低圧流路との間を開放する制御弁とを備え、電動アクチュエータの動作によりノズルニードルを駆動して噴孔を開放する燃料噴射弁であって、第２背圧室と高圧流路との間を接続し、高圧流路から第２背圧室に燃料を導く昇圧流路を備え、制御弁の動作により第２背圧室と低圧流路との間を開放し、第２背圧室の燃料圧を低下させてサーボ弁を一端側に変位させることで昇圧流路を閉鎖する。また、第１背圧室と第２背圧室との間を燃料が常に流通可能となるように接続する第２連通流路が設けられ、昇圧流路は、第１連通流路および前記第２連通流路を含んで形成される。   The fuel injection valve of the best mode 1 has a first back pressure chamber at one end, a nozzle needle that opens and closes a nozzle hole by increasing or decreasing the fuel pressure in the first back pressure chamber, a second back pressure chamber at one end, And a servo valve that forms a valve chamber at the other end, moves by the difference in fuel pressure between the second back pressure chamber and the valve chamber, and opens and closes between the first back pressure chamber and the high pressure flow path, The first communication channel that connects the back pressure chamber and the valve chamber so that the fuel can always flow, and the electric actuator is energized to operate between the second back pressure chamber and the low pressure channel. A fuel injection valve that opens a nozzle hole by driving a nozzle needle by the operation of an electric actuator, connecting a second back pressure chamber and a high pressure flow path, A pressure increasing flow path for guiding fuel from the passage to the second back pressure chamber, and opening the space between the second back pressure chamber and the low pressure flow path by the operation of the control valve. It lowers the fuel pressure to close the booster channel by displacing the servo valve at one end. In addition, a second communication flow path is provided to connect the first back pressure chamber and the second back pressure chamber so that fuel can always flow, and the pressure increase flow path includes the first communication flow path and the first back flow chamber. It is formed including two communication channels.

最良の形態２の燃料噴射弁によれば、弁室と第２背圧室との間を燃料が常に流通可能となるように接続する第３連通流路を設け、昇圧流路は、第３連通流路を含んで形成される。   According to the fuel injection valve of the best mode 2, the third communication flow path is provided to connect the valve chamber and the second back pressure chamber so that the fuel can always flow. It is formed including a communication channel.

〔実施例１の構成〕
実施例１の燃料噴射弁１の構成を、図１ないし図３を用いて説明する。
燃料噴射弁１は、図１に示すように、燃料を噴射するノズル２と、ノズル２の一端側に連結され、コモンレール（図示せず）等の燃料供給源から燃料を受け入れてノズル２に導く本体３とを備える。 [Configuration of Example 1]
The structure of the fuel injection valve 1 of Example 1 is demonstrated using FIG. 1 thru | or FIG.
As shown in FIG. 1, the fuel injection valve 1 is connected to a nozzle 2 that injects fuel and one end side of the nozzle 2, receives fuel from a fuel supply source such as a common rail (not shown), and guides the fuel to the nozzle 2. A main body 3.

ノズル２は、ノズルボディ５の他端に形成された噴孔６を開閉するノズルニードル７を有する。ノズルニードル７の一端には第１背圧室８が形成され、第１背圧室８の燃料圧の増減により、ノズルニードル７が一端側又は他端側に変位して噴孔６を開閉する。
また、本体３は、ソレノイドコイル１１への通電により一端側に駆動される制御弁１２と、制御弁１２の動作により一端側又は他端側に変位するサーボ弁１３とを有する。 The nozzle 2 has a nozzle needle 7 that opens and closes a nozzle hole 6 formed at the other end of the nozzle body 5. A first back pressure chamber 8 is formed at one end of the nozzle needle 7, and the nozzle needle 7 is displaced to one end side or the other end side by opening / closing the nozzle hole 6 by increasing / decreasing the fuel pressure in the first back pressure chamber 8. .
The main body 3 includes a control valve 12 that is driven to one end side by energization of the solenoid coil 11 and a servo valve 13 that is displaced to one end side or the other end side by the operation of the control valve 12.

サーボ弁１３は、図２に示すように、ボディ１４に摺動自在に支持される軸部１７と、開閉機能を発揮する弁部１８とを有し、軸部１７の一端側に第２背圧室１９を形成し、軸部１７の他端側に弁部１８を収容する弁室２０を形成する。   As shown in FIG. 2, the servo valve 13 includes a shaft portion 17 that is slidably supported by the body 14 and a valve portion 18 that exhibits an opening / closing function. A pressure chamber 19 is formed, and a valve chamber 20 that houses the valve portion 18 is formed on the other end side of the shaft portion 17.

弁室２０には、第１背圧室８と弁室２０との間を燃料が常に流通可能となるように接続する第１連通流路２２、高圧流路２３から弁室２０へ燃料を供給する第１流入流路２４、および弁室２０を介して第１背圧室８から低圧流路２５へ燃料を排出する第１流出流路２６が接続する。   Fuel is supplied to the valve chamber 20 from the first communication channel 22 and the high-pressure channel 23 that are connected so that fuel can always flow between the first back pressure chamber 8 and the valve chamber 20. The first inflow passage 24 and the first outflow passage 26 for discharging fuel from the first back pressure chamber 8 to the low pressure passage 25 are connected via the valve chamber 20.

なお、高圧流路２３はコモンレールに接続しており、低圧流路２５は燃料のリターン流路に接続している。また、第１連通流路２２には、第１背圧室８への燃料の流入流量を規制するオリフィス２９が設けられ、第１流出流路２６には、第１背圧室８からの燃料の流出流量を規制するオリフィス３０が設けられている。   The high pressure channel 23 is connected to a common rail, and the low pressure channel 25 is connected to a fuel return channel. The first communication flow path 22 is provided with an orifice 29 that regulates the flow rate of the fuel flowing into the first back pressure chamber 8, and the first outflow flow path 26 is fuel from the first back pressure chamber 8. An orifice 30 is provided for regulating the outflow rate of the gas.

第１連通流路２２の一端は、弁室２０の他端に開口し、常時、弁室２０に開放されている。また、第１流出流路２６は、弁室２０の他端に開口し、弁部１８の他端面３２により開閉される。すなわち、第１流出流路２６は、サーボ弁１３が一端側に変位すると弁室２０に開放され（図３参照）、サーボ弁１３が他端側に変位すると弁室２０に対して閉鎖される。また、第１流入流路２４は、弁室２０の一端に開口し、常時、弁室２０に開放されている。   One end of the first communication channel 22 opens to the other end of the valve chamber 20 and is always open to the valve chamber 20. The first outflow channel 26 opens to the other end of the valve chamber 20 and is opened and closed by the other end surface 32 of the valve portion 18. That is, the first outflow passage 26 is opened to the valve chamber 20 when the servo valve 13 is displaced to one end side (see FIG. 3), and is closed to the valve chamber 20 when the servo valve 13 is displaced to the other end side. . The first inflow channel 24 opens at one end of the valve chamber 20 and is always open to the valve chamber 20.

第１連通流路２２と第１流入流路２４との間は、テーパ状に設けられた弁部１８の一端面３３が第１連通流路２２の開口部３４と、第１流入流路２４の開口部３５との間に形成されるシート部３６に着座又は離座することで開閉される。すなわち、サーボ弁１３が一端側に変位すると、一端面３３がシート部３６に着座して第１連通流路２２と第１流入流路２４との間が閉鎖され（図３参照）、サーボ弁１３が他端側に変位すると、一端面３３がシート部３６から離座して第１連通流路２２と第１流入流路２４との間が開放される。   Between the first communication channel 22 and the first inflow channel 24, one end surface 33 of the valve portion 18 provided in a tapered shape is connected to the opening 34 of the first communication channel 22 and the first inflow channel 24. It opens and closes by seating on or leaving a seat portion 36 formed between the opening portion 35 and the opening portion 35. That is, when the servo valve 13 is displaced to one end side, the one end surface 33 is seated on the seat portion 36 and the space between the first communication channel 22 and the first inflow channel 24 is closed (see FIG. 3). When 13 is displaced to the other end side, the one end surface 33 is separated from the seat portion 36 and the space between the first communication channel 22 and the first inflow channel 24 is opened.

以上のように、サーボ弁１３が一端側に変位すると、第１流出流路２６が弁室２０に開放され、第１連通流路２２と第１流入流路２４との間が閉鎖され、第１連通流路２２と第１流出流路２６とが弁室２０を介して連通する（図３参照）。また、サーボ弁１３が他端側に変位すると、第１流出流路２６が弁室２０に対して閉鎖され、第１連通流路２２と第１流入流路２４とが連通する。   As described above, when the servo valve 13 is displaced to one end side, the first outflow passage 26 is opened to the valve chamber 20, the space between the first communication passage 22 and the first inflow passage 24 is closed, The 1 communication channel 22 and the 1st outflow channel 26 are connected via the valve chamber 20 (refer FIG. 3). Further, when the servo valve 13 is displaced to the other end side, the first outflow channel 26 is closed with respect to the valve chamber 20, and the first communication channel 22 and the first inflow channel 24 are communicated.

すなわち、サーボ弁１３は、一端側又は他端側に変位することにより、第１連通流路２２と第１流入流路２４とが連通するとともに第１流出流路２６が弁室２０に対して閉鎖される閉状態と、第１連通流路２２と第１流入流路２４との間が閉鎖されるとともに第１連通流路２２と第１流出流路２６とが連通する開状態とを切り替える。
サーボ弁１３の開状態と閉状態との切替は、第２背圧室１９の燃料圧の増減によって行われる。 That is, the servo valve 13 is displaced to one end side or the other end side, whereby the first communication flow path 22 and the first inflow flow path 24 communicate with each other, and the first outflow flow path 26 is connected to the valve chamber 20. Switching between a closed state in which the first communication channel 22 and the first inflow channel 24 are closed and an open state in which the first communication channel 22 and the first outflow channel 26 communicate with each other is switched. .
Switching between the open state and the closed state of the servo valve 13 is performed by increasing or decreasing the fuel pressure in the second back pressure chamber 19.

第２背圧室１９には、低圧流路２５に通じる第２流出流路３９が接続している。なお、第２流出流路３９には、第２背圧室１９からの燃料の流出流量を規制するオリフィス４０が設けられている。また、実施例１の燃料噴射弁１には、第１背圧室８と第２背圧室１９との間を燃料が常に流通可能となるように接続する第２連通流路４３が設けられている。そして、制御弁１２による第２流出流路３９の開閉によりサーボ弁１３の開状態と閉状態との切替が行われ、ノズルニードル７が変位して噴孔６が開閉される。   The second back pressure chamber 19 is connected to a second outflow passage 39 that leads to the low pressure passage 25. The second outflow passage 39 is provided with an orifice 40 that regulates the outflow rate of the fuel from the second back pressure chamber 19. Further, the fuel injection valve 1 of the first embodiment is provided with a second communication channel 43 that connects the first back pressure chamber 8 and the second back pressure chamber 19 so that fuel can always flow. ing. Then, the servo valve 13 is switched between an open state and a closed state by opening and closing the second outflow passage 39 by the control valve 12, and the nozzle needle 7 is displaced to open and close the nozzle hole 6.

すなわち、ソレノイドコイル１１への通電が開始し制御弁１２が第２流出流路３９を開放すると、第２背圧室１９の燃料が第２流出流路３９を介して低圧流路２５へリークする（図３参照）。このため、第２背圧室１９の燃料圧が低下し、サーボ弁１３は閉状態から開状態に移行する。これにより、第１連通流路２２と第１流出流路２６とが連通するため、第１連通流路２２、弁室２０、および第１流出流路２６を介して第１背圧室８の燃料が低圧流路２５へリークする。また、第２連通流路４３、第２背圧室１９、第２流出流路３９を介する流路からも第１背圧室８の燃料が低圧流路２５へリークする。このため、第１背圧室８の燃料圧が低下し、ノズルニードル７が一端側に変位して噴孔６を開放する。   That is, when energization of the solenoid coil 11 is started and the control valve 12 opens the second outflow passage 39, the fuel in the second back pressure chamber 19 leaks into the low pressure passage 25 through the second outflow passage 39. (See FIG. 3). For this reason, the fuel pressure in the second back pressure chamber 19 decreases, and the servo valve 13 shifts from the closed state to the open state. As a result, the first communication flow path 22 and the first outflow flow path 26 communicate with each other, so that the first back pressure chamber 8 passes through the first communication flow path 22, the valve chamber 20, and the first outflow flow path 26. The fuel leaks into the low pressure channel 25. In addition, the fuel in the first back pressure chamber 8 leaks to the low pressure flow path 25 from the flow path via the second communication flow path 43, the second back pressure chamber 19, and the second outflow flow path 39. For this reason, the fuel pressure in the first back pressure chamber 8 is lowered, and the nozzle needle 7 is displaced to one end side to open the nozzle hole 6.

そして、ソレノイドコイル１１への通電が停止し制御弁１２が第２流出流路３９を閉鎖すると、第２連通流路４３を介する第１背圧室８から第２背圧室１９への燃料の流入により、第２背圧室１９の燃料圧が上昇する。この結果、第２背圧室１９の燃料圧が増加し、サーボ弁１３が他端側への変位を開始して開状態から閉状態に移行する。これにより、第１流出流路２６が閉鎖され、第１連通流路２２と第１流入流路２４とが連通するため、低圧流路２５への燃料リークは停止し、第１流入流路２４、弁室２０、および第１連通流路２２を介して第１背圧室８に燃料が流入する。このため、第１背圧室８の燃料圧が増加し、ノズルニードル７が他端側に変位して噴孔６を閉鎖する。   When energization of the solenoid coil 11 is stopped and the control valve 12 closes the second outflow passage 39, the fuel from the first back pressure chamber 8 to the second back pressure chamber 19 via the second communication passage 43 is discharged. Due to the inflow, the fuel pressure in the second back pressure chamber 19 increases. As a result, the fuel pressure in the second back pressure chamber 19 increases, the servo valve 13 starts to move to the other end side, and shifts from the open state to the closed state. As a result, the first outflow passage 26 is closed, and the first communication passage 22 and the first inflow passage 24 communicate with each other. Therefore, fuel leakage to the low pressure passage 25 stops, and the first inflow passage 24 The fuel flows into the first back pressure chamber 8 through the valve chamber 20 and the first communication flow path 22. For this reason, the fuel pressure in the first back pressure chamber 8 increases, the nozzle needle 7 is displaced to the other end side, and the nozzle hole 6 is closed.

ここで、第１流入流路２４、弁室２０、第１連通流路２２、第１背圧室８、および第２連通流路４３は、第２背圧室１９と高圧流路２３との間を接続し、高圧流路２３から第２背圧室１９に燃料を導く昇圧流路４５としての機能を有する。   Here, the first inflow channel 24, the valve chamber 20, the first communication channel 22, the first back pressure chamber 8, and the second communication channel 43 are connected between the second back pressure chamber 19 and the high pressure channel 23. And has a function as a pressure increasing channel 45 that leads fuel from the high pressure channel 23 to the second back pressure chamber 19.

そして、燃料噴射弁１は、制御弁１２の動作により第２背圧室１９と低圧流路２５との間を開放し、第２背圧室１９の燃料圧を低下させてサーボ弁１３を一端側に変位させることで昇圧流路４５を閉鎖する（つまり、燃料噴射弁１はサーボ弁１３を開状態にすることで、昇圧流路４５を閉鎖する）。
すなわち、サーボ弁１３が開状態になると、第１連通流路２２と第１流入流路２４との間が閉鎖されて、昇圧流路４５が閉鎖され、高圧流路２３から第２背圧室１９への燃料の流入が遮断される。 Then, the fuel injection valve 1 opens the space between the second back pressure chamber 19 and the low pressure passage 25 by the operation of the control valve 12, lowers the fuel pressure in the second back pressure chamber 19, and starts the servo valve 13 at one end. The booster passage 45 is closed by being displaced to the side (that is, the fuel injection valve 1 closes the booster passage 45 by opening the servo valve 13).
That is, when the servo valve 13 is opened, the space between the first communication flow path 22 and the first inflow flow path 24 is closed, the pressure increase flow path 45 is closed, and the second back pressure chamber is opened from the high pressure flow path 23. Inflow of fuel to 19 is blocked.

〔実施例１の効果〕
実施例１の燃料噴射弁１は、第１流入流路２４、弁室２０、第１連通流路２２、第１背圧室８、および第２連通流路４３からなる昇圧流路４５を備える。そして、制御弁１２の動作によりサーボ弁１３が開状態になると、第１連通流路２２と第１流入流路２４との間が閉鎖されることで、昇圧流路４５が閉鎖され、高圧流路２３から第２背圧室１９への燃料の流入が遮断される。
これにより、制御弁１２が動作してノズルニードル７が駆動される際、第２背圧室１９と低圧流路２５との間が開放されるとともに、第２背圧室１９と高圧流路２３との間が閉鎖される。このため、ノズルニードル７の駆動時に高圧燃料の余分なリークが生じず、エネルギ損失を低減できる。 [Effect of Example 1]
The fuel injection valve 1 according to the first embodiment includes a pressure increasing channel 45 including a first inflow channel 24, a valve chamber 20, a first communication channel 22, a first back pressure chamber 8, and a second communication channel 43. . Then, when the servo valve 13 is opened by the operation of the control valve 12, the boosting channel 45 is closed by closing the first communication channel 22 and the first inflow channel 24. Inflow of fuel from the passage 23 to the second back pressure chamber 19 is blocked.
Thereby, when the control valve 12 operates and the nozzle needle 7 is driven, the space between the second back pressure chamber 19 and the low pressure passage 25 is opened, and the second back pressure chamber 19 and the high pressure passage 23 are opened. Is closed. For this reason, excessive leakage of high-pressure fuel does not occur when the nozzle needle 7 is driven, and energy loss can be reduced.

また、実施例１の燃料噴射弁１は、第１背圧室８と第２背圧室１９との間を燃料が常に流通可能となるように接続する第２連通流路４３が設けられ、第２連通流路４３を通じて第１背圧室８から第２背圧室１９に燃料を流入させることで第２背圧室１９の燃料圧を増加し、サーボ弁１３を開状態から閉状態に切り替えることができる。
このため、第２背圧室１９と高圧流路２３との間を燃料が常に流通可能となるように連通させる流路（例えば、従来例の昇圧流路１２０）、すなわち、第２背圧室１９の燃料圧を増加するための流路が不要になる。この結果、第２流出流路３９が開放されているときに、第１背圧室８からの燃料リーク以外の燃料リークが発生しなくなるので、第１背圧室８をサーボ弁１３により開閉する燃料噴射弁１において、余分な燃料リークを低減することができる。 Further, the fuel injection valve 1 of the first embodiment is provided with a second communication channel 43 that connects the first back pressure chamber 8 and the second back pressure chamber 19 so that fuel can always flow. By flowing fuel from the first back pressure chamber 8 into the second back pressure chamber 19 through the second communication channel 43, the fuel pressure in the second back pressure chamber 19 is increased, and the servo valve 13 is changed from the open state to the closed state. Can be switched.
For this reason, the flow path (for example, the pressure increasing flow path 120 of the conventional example) that communicates between the second back pressure chamber 19 and the high pressure flow path 23 so that the fuel can always flow, that is, the second back pressure chamber. The flow path for increasing the fuel pressure of 19 becomes unnecessary. As a result, when the second outflow passage 39 is opened, no fuel leak other than the fuel leak from the first back pressure chamber 8 occurs, so the first back pressure chamber 8 is opened and closed by the servo valve 13. In the fuel injection valve 1, excess fuel leakage can be reduced.

〔実施例２の構成〕
実施例２の燃料噴射弁１の構成を、図４および図５を用いて説明する。
実施例２の燃料噴射弁１は、弁室２０と第２背圧室１９との間を燃料が常に流通可能となるように接続する第３連通流路４６が設けられている。そして、第３連通流路４６は、サーボ弁１３が開状態にあるときに第１流入流路２４との間を閉鎖され（図５参照）、サーボ弁１３が閉状態にあるときに第１流入流路２４との間を開放される（図４参照）。 [Configuration of Example 2]
The structure of the fuel injection valve 1 of Example 2 is demonstrated using FIG. 4 and FIG.
The fuel injection valve 1 according to the second embodiment is provided with a third communication channel 46 that connects the valve chamber 20 and the second back pressure chamber 19 so that fuel can always flow. The third communication flow path 46 is closed between the first inflow flow path 24 when the servo valve 13 is in the open state (see FIG. 5) and is first when the servo valve 13 is in the closed state. The space between the inflow channel 24 is opened (see FIG. 4).

すなわち、第３連通流路４６は、弁室２０の他端に開口しており、第３連通流路４６と第１流入流路２４との間は、第１連通流路２２と第１流入流路２４との間と同様に、弁部１８の一端面３３がシート部３６に着座又は離座することで開閉される。つまり、サーボ弁１３が一端側に変位すると、一端面３３がシート部３６に着座して第３連通流路４６と第１流入流路２４との間が閉鎖され、サーボ弁１３が他端側に変位すると、一端面３３がシート部３６から離座して第３連通流路４６と第１流入流路２４との間が開放される。   That is, the third communication channel 46 opens to the other end of the valve chamber 20, and the first communication channel 22 and the first inflow are between the third communication channel 46 and the first inflow channel 24. As with the flow path 24, the one end surface 33 of the valve portion 18 is opened and closed by being seated or separated from the seat portion 36. That is, when the servo valve 13 is displaced to one end side, the one end surface 33 is seated on the seat portion 36 and the space between the third communication flow path 46 and the first inflow flow path 24 is closed, and the servo valve 13 is moved to the other end side. Is displaced from the seat portion 36 and the space between the third communication channel 46 and the first inflow channel 24 is opened.

そして、ソレノイドコイル１１への通電が開始し制御弁１２が第２流出流路３９を開放すると、第１連通流路２２、弁室２０、および第１流出流路２６を介する流路とともに、第１連通流路２２、弁室２０、第３連通流路４６、第２背圧室１９、第２流出流路３９を介する流路からも第１背圧室８の燃料が低圧流路２５へリークする。このため、第１背圧室８の燃料圧が低下し、ノズルニードル７が一端側に変位して噴孔６を開放する。   Then, when energization of the solenoid coil 11 is started and the control valve 12 opens the second outflow passage 39, the first communication passage 22, the valve chamber 20, and the flow passage through the first outflow passage 26, The fuel in the first back pressure chamber 8 also enters the low pressure passage 25 from the passage through the first communication passage 22, the valve chamber 20, the third communication passage 46, the second back pressure chamber 19, and the second outflow passage 39. To leak. For this reason, the fuel pressure in the first back pressure chamber 8 is lowered, and the nozzle needle 7 is displaced to one end side to open the nozzle hole 6.

また、ソレノイドコイル１１への通電が停止し制御弁１２が第２流出流路３９を閉鎖すると、第１連通流路２２、弁室２０、第３連通流路４６を介する第１背圧室８から第２背圧室１９への燃料の流入により第２背圧室１９の燃料圧が上昇する。この結果、第２背圧室１９の燃料圧が増加し、サーボ弁１３が他端側への変位を開始して開状態から閉状態に移行する。このため、第１背圧室８の燃料圧が増加し、ノズルニードル７が他端側に変位して噴孔６を閉鎖する。   When the energization of the solenoid coil 11 is stopped and the control valve 12 closes the second outflow passage 39, the first back pressure chamber 8 via the first communication passage 22, the valve chamber 20, and the third communication passage 46 is used. The fuel pressure in the second back pressure chamber 19 rises due to the inflow of fuel from the second back pressure chamber 19 to the second back pressure chamber 19. As a result, the fuel pressure in the second back pressure chamber 19 increases, the servo valve 13 starts to move to the other end side, and shifts from the open state to the closed state. For this reason, the fuel pressure in the first back pressure chamber 8 increases, the nozzle needle 7 is displaced to the other end side, and the nozzle hole 6 is closed.

ここで、実施例２の昇圧流路４５は、第１流入流路２４、弁室２０、および第３連通流路４６から形成されている。
そして、サーボ弁１３が一端側へ変位し開状態になると、第３連通流路４６と第１流入流路２４との間が閉鎖されて、昇圧流路４５が閉鎖され、高圧流路２３から第２背圧室１９への燃料の流入が遮断される。 Here, the pressure increasing channel 45 of the second embodiment is formed by the first inflow channel 24, the valve chamber 20, and the third communication channel 46.
When the servo valve 13 is displaced to one end side and is in an open state, the space between the third communication flow path 46 and the first inflow flow path 24 is closed, the pressure increase flow path 45 is closed, and the high pressure flow path 23 is The flow of fuel into the second back pressure chamber 19 is blocked.

〔実施例２の効果〕
実施例２の燃料噴射弁１は、弁室２０と第２背圧室１９との間を燃料が常に流通可能となるように接続する第３連通流路４６が設けられている。
これにより、第１連通流路２２、弁室２０、および第３連通流路４６を通じて第１背圧室８から第２背圧室１９に燃料を流入させることで第２背圧室１９の燃料圧を増加し、サーボ弁１３を開状態から閉状態に切り替えることができる。このため、第２流出流路３９が開放されているときに、第１背圧室８からの燃料リーク以外の燃料リークが発生しなくなるので、第１背圧室８をサーボ弁１３により開閉する燃料噴射弁１において、余分な燃料リークを低減することができる。 [Effect of Example 2]
The fuel injection valve 1 according to the second embodiment is provided with a third communication channel 46 that connects the valve chamber 20 and the second back pressure chamber 19 so that fuel can always flow.
Accordingly, the fuel in the second back pressure chamber 19 is caused to flow into the second back pressure chamber 19 from the first back pressure chamber 8 through the first communication channel 22, the valve chamber 20, and the third communication channel 46. The pressure can be increased and the servo valve 13 can be switched from the open state to the closed state. For this reason, when the second outflow passage 39 is opened, no fuel leak other than the fuel leak from the first back pressure chamber 8 occurs, so the first back pressure chamber 8 is opened and closed by the servo valve 13. In the fuel injection valve 1, excess fuel leakage can be reduced.

また、実施例２の燃料噴射弁１では、第２背圧室１９に連通する第３連通流路４６が弁室２０に接続するため、第１背圧室８に接続する流路の数は増えない。これにより、第１背圧室８の実質的な容積は増加しないので、第１背圧室８の燃料圧増減のため第１背圧室８に流出入させる燃料の必要量は変動しない。このため、ノズルニードル７による噴孔開閉の応答性を従来と同等にすることができる。   In the fuel injection valve 1 according to the second embodiment, the third communication flow path 46 communicating with the second back pressure chamber 19 is connected to the valve chamber 20, so the number of flow paths connected to the first back pressure chamber 8 is Will not Increase. Thereby, since the substantial volume of the first back pressure chamber 8 does not increase, the required amount of fuel flowing into and out of the first back pressure chamber 8 does not fluctuate due to the increase or decrease of the fuel pressure in the first back pressure chamber 8. For this reason, the response of opening and closing the nozzle hole by the nozzle needle 7 can be made equivalent to the conventional one.

また、ボディ１４は、弁室２０の他端を境界とする２部材（２部材の内、一端側を部材４７、他端側を部材４８とする）により構成されている。これにより、第３連通流路４６は、部材４７のみに加工を施すことで設けられるので、部材４７、４８の両方に流路を設けて、これらの流路の位置合わせを行う必要がない。   The body 14 is configured by two members having the other end of the valve chamber 20 as a boundary (one of the two members is a member 47 and the other end is a member 48). Thereby, since the 3rd communication channel 46 is provided by processing only member 47, it is not necessary to provide a channel in both members 47 and 48 and to align these channels.

燃料噴射弁の全体構成図である（実施例１）。1 is an overall configuration diagram of a fuel injection valve (Example 1). FIG. サーボ弁が閉状態にあるときの燃料噴射弁の要部構成図である（実施例１）。(Example 1) which is a principal part block diagram of a fuel injection valve when a servo valve is in a closed state. サーボ弁が開状態にあるときの燃料噴射弁の要部構成図である（実施例１）。(Example 1) which is a principal part block diagram of a fuel injection valve when a servo valve is in an open state. サーボ弁が閉状態にあるときの燃料噴射弁の要部構成図である（実施例２）。(Example 2) which is a principal part block diagram of a fuel injection valve when a servo valve is in a closed state. サーボ弁が開状態にあるときの燃料噴射弁の要部構成図である（実施例２）。(Example 2) which is a principal part block diagram of a fuel injection valve when a servo valve is in an open state. （ａ）は、サーボ弁が閉状態にあるときの燃料噴射弁の要部構成図であり、（ｂ）は、サーボ弁が開状態にあるときの燃料噴射弁の要部構成図である（従来例）。(A) is a principal part block diagram of a fuel injection valve when a servo valve is a closed state, (b) is a principal part block diagram of a fuel injection valve when a servo valve is an open state ( Conventional example).

符号の説明Explanation of symbols

１ 燃料噴射弁
２ ノズル
３ 本体
６ 噴孔
７ ノズルニードル
８ 第１背圧室
１１ ソレノイドコイル（電動アクチュエータ）
１２ 制御弁
１３ サーボ弁
１９ 第２背圧室
２０ 弁室
２２ 第１連通流路
２３ 高圧流路
２４ 第１流入流路
２５ 低圧流路
２６ 第１流出流路
３９ 第２流出流路
４３ 第２連通流路
４５ 昇圧流路
４６ 第３連通流路 DESCRIPTION OF SYMBOLS 1 Fuel injection valve 2 Nozzle 3 Main body 6 Injection hole 7 Nozzle needle 8 1st back pressure chamber 11 Solenoid coil (electric actuator)
12 control valve 13 servo valve 19 second back pressure chamber 20 valve chamber 22 first communication channel 23 high pressure channel 24 first inflow channel 25 low pressure channel 26 first outflow channel 39 second outflow channel 43 second Communication channel 45 Boost channel 46 Third communication channel

Claims (2)

一端に第１背圧室を形成し、この第１背圧室の燃料圧の増減により噴孔を開閉するノズルニードルと、
一端に第２背圧室、および他端に弁室を形成し、前記第２背圧室と前記弁室との燃料圧の差により移動して、前記第１背圧室と高圧流路との間を開閉するサーボ弁と、
前記第１背圧室と前記弁室との間を、燃料が常に流通可能となるように接続する第１連通流路と、
電動アクチュエータへの通電により動作し、前記第２背圧室と低圧流路との間を開放する制御弁とを備え、
前記電動アクチュエータの動作により前記ノズルニードルを駆動して前記噴孔を開放する燃料噴射弁であって、
前記第１背圧室と前記第２背圧室との間を燃料が常に流通可能となるように接続する第２連通流路と、
前記第１連通流路および前記第２連通流路を含んで形成されて、前記第２背圧室と前記高圧流路との間を接続し、前記高圧流路から前記第２背圧室に燃料を導く昇圧流路とを備え、
前記制御弁の動作により前記第２背圧室と前記低圧流路との間を開放し、前記第２背圧室の燃料圧を低下させて前記サーボ弁を一端側に変位させることで前記昇圧流路を閉鎖することを特徴とする燃料噴射弁。 A nozzle needle for forming a first back pressure chamber at one end and opening and closing the nozzle hole by increasing or decreasing the fuel pressure in the first back pressure chamber;
A second back pressure chamber is formed at one end, and a valve chamber is formed at the other end, and the first back pressure chamber and the high pressure flow path are moved by the difference in fuel pressure between the second back pressure chamber and the valve chamber. A servo valve that opens and closes between,
A first communication flow path connecting the first back pressure chamber and the valve chamber so that fuel can always flow;
A control valve that operates by energizing the electric actuator and opens between the second back pressure chamber and the low pressure flow path;
A fuel injection valve that opens the nozzle hole by driving the nozzle needle by the operation of the electric actuator,
A second communication channel that connects the first back pressure chamber and the second back pressure chamber so that fuel can always flow therethrough,
The first communication channel and the second communication channel are formed to connect between the second back pressure chamber and the high pressure channel, and from the high pressure channel to the second back pressure chamber. and a boost flow path for guiding the fuel,
The operation of the control valve opens the space between the second back pressure chamber and the low pressure flow path, reduces the fuel pressure in the second back pressure chamber, and displaces the servo valve to one end side to increase the pressure. A fuel injection valve characterized by closing a flow path. 一端に第１背圧室を形成し、この第１背圧室の燃料圧の増減により噴孔を開閉するノズルニードルと、
一端に第２背圧室、および他端に弁室を形成し、前記第２背圧室と前記弁室との燃料圧の差により移動して、前記第１背圧室と高圧流路との間を開閉するサーボ弁と、
前記第１背圧室と前記弁室との間を、燃料が常に流通可能となるように接続する第１連通流路と、
電動アクチュエータへの通電により動作し、前記第２背圧室と低圧流路との間を開放する制御弁とを備え、
前記電動アクチュエータの動作により前記ノズルニードルを駆動して前記噴孔を開放する燃料噴射弁であって、
前記弁室と前記第２背圧室との間を燃料が常に流通可能となるように接続する第３連通流路と、
前記第３連通流路を含んで形成されて、前記第２背圧室と前記高圧流路との間を接続し、前記高圧流路から前記第２背圧室に燃料を導く昇圧流路とを備え、
前記制御弁の動作により前記第２背圧室と前記低圧流路との間を開放し、前記第２背圧室の燃料圧を低下させて前記サーボ弁を一端側に変位させることで前記昇圧流路を閉鎖することを特徴とする燃料噴射弁。 A nozzle needle for forming a first back pressure chamber at one end and opening and closing the nozzle hole by increasing or decreasing the fuel pressure in the first back pressure chamber;
A second back pressure chamber is formed at one end, and a valve chamber is formed at the other end, and the first back pressure chamber and the high pressure flow path are moved by the difference in fuel pressure between the second back pressure chamber and the valve chamber. A servo valve that opens and closes between,
A first communication flow path connecting the first back pressure chamber and the valve chamber so that fuel can always flow;
A control valve that operates by energizing the electric actuator and opens between the second back pressure chamber and the low pressure flow path;
A fuel injection valve that opens the nozzle hole by driving the nozzle needle by the operation of the electric actuator,
A third communication channel that connects the valve chamber and the second back pressure chamber so that fuel can always flow therethrough,
A pressure increasing channel that is formed including the third communication channel, connects the second back pressure chamber and the high pressure channel, and guides fuel from the high pressure channel to the second back pressure chamber; With
The operation of the control valve opens the space between the second back pressure chamber and the low pressure flow path, reduces the fuel pressure in the second back pressure chamber, and displaces the servo valve to one end side to increase the pressure. A fuel injection valve characterized by closing a flow path .
JP2006356385A 2006-12-28 2006-12-28 Fuel injection valve Expired - Fee Related JP4682979B2 (en)

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Citations (3)

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JP2000087821A (en) * 1998-09-14 2000-03-28 Denso Corp Injection valve
JP2004251205A (en) * 2003-02-20 2004-09-09 Denso Corp Injector
JP2006257874A (en) * 2004-04-30 2006-09-28 Denso Corp Injector

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000087821A (en) * 1998-09-14 2000-03-28 Denso Corp Injection valve
JP2004251205A (en) * 2003-02-20 2004-09-09 Denso Corp Injector
JP2006257874A (en) * 2004-04-30 2006-09-28 Denso Corp Injector

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