EP1865192B1 - Injecteur de carburant doté d'une assistance adaptative à la direction - Google Patents

Injecteur de carburant doté d'une assistance adaptative à la direction Download PDF

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Publication number
EP1865192B1
EP1865192B1 EP20070106974 EP07106974A EP1865192B1 EP 1865192 B1 EP1865192 B1 EP 1865192B1 EP 20070106974 EP20070106974 EP 20070106974 EP 07106974 A EP07106974 A EP 07106974A EP 1865192 B1 EP1865192 B1 EP 1865192B1
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EP
European Patent Office
Prior art keywords
piston
pressure
booster piston
chamber
valve member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP20070106974
Other languages
German (de)
English (en)
Other versions
EP1865192A2 (fr
EP1865192A3 (fr
Inventor
Friedrich Boecking
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of EP1865192A2 publication Critical patent/EP1865192A2/fr
Publication of EP1865192A3 publication Critical patent/EP1865192A3/fr
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Publication of EP1865192B1 publication Critical patent/EP1865192B1/fr
Expired - Fee Related legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/704—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with actuator and actuated element moving in different directions, e.g. in opposite directions

Definitions

  • the invention relates to an injector for injecting fuel into a combustion chamber of an internal combustion engine according to the preamble of claim 1.
  • a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine having an injector housing having a fuel inlet communicating with a central fuel high pressure source outside the injector housing and with a pressure space within the injector housing depending on the position a control valve is injected with high pressure fuel.
  • the control valve is actuated by means of a piezoelectric actuator.
  • a coupling space is formed between the control valve and the piezoelectric actuator. This acts as a hydraulic translator on the valve piston of the control valve.
  • an injection valve in which the piezoelectric actuator is connected to a booster piston.
  • the booster piston has a cylindrical portion in which the injection valve member is guided, wherein the booster piston defines a control space together with the end face of the injection valve member.
  • An inventively designed injector for injecting fuel into a combustion chamber of an internal combustion engine is actuated by means of an actuator and is connected to a fuel inlet, is supplied via the standing under system pressure fuel.
  • the injector at least one injection opening can be opened or closed by an injection valve member, wherein the injection valve member is controlled by means of a booster piston.
  • a sleeve-shaped section is formed on the booster piston, in which the injection valve member is guided, and which defines a control space with an end face of the injection valve member.
  • the booster piston is a valve piston of a servo valve.
  • the actuator is preferably a piezoelectric actuator. But it can also be used any other actuator that expands when power is supplied and contracts at the end of the energization.
  • a sealing edge is preferably formed, which is adjustable in a valve seat. In this way, a connection from a valve chamber can be released or closed in a power return.
  • the control chamber is hydraulically connected to the valve chamber. This makes it possible that when the servo valve is open, the pressurized fuel flows from the control chamber into the fuel return and the pressure in the control chamber falls. As a result, the pressure in the control chamber decreases and the injection valve member opens.
  • a bore is formed in the booster piston on the side opposite the injection valve member, in which a pressure piston is guided.
  • the pressure piston is connected to the actuator.
  • An end face of the pressure piston limits the control chamber.
  • the pressure piston moves with its end face out of the control chamber.
  • the volume of the control room increases.
  • the pressure in the control chamber decreases, and the injection valve member moves into the control chamber, thereby removing it from its seat is lifted and the at least one injection opening releases. The injection process begins.
  • the end face of the pressure piston is enclosed in this embodiment by a shoulder on the booster piston.
  • a lower pressure force also acts on the shoulder on the booster piston, so that the booster piston is moved in the direction of the control chamber.
  • the movement of the booster piston lifts the sealing edge on the booster piston out of the valve seat so that the connection from the valve chamber to the fuel return is released.
  • the fuel under system pressure flows through the valve chamber into the fuel return, which further reduces the pressure in the control chamber. This results in a faster opening movement of the injection valve member.
  • Another advantage is that due to the fuel flowing out of the control chamber, the pressure in the control chamber drops very rapidly and thus a rapid opening of the injection valve member is made possible.
  • the valve chamber is preferably connected hydraulically to the fuel inlet.
  • the actuator As soon as the actuator is energized, it expands and the pressure piston is moved in the direction of the control chamber. As a result, the volume in the control chamber decreases, and the force acting on the shoulder of the booster piston pressure force increases.
  • the booster piston is placed with its sealing edge in the valve seat and thus closes the connection from Valve chamber in the fuel return. As soon as the connection from the valve chamber to the fuel return is closed, fuel flows from the fuel inlet via the valve chamber into the control chamber. As a result, the pressure in the control chamber continues to increase, and the movement of the injection valve member into the seat for closing the at least one injection opening is accelerated.
  • an end face of the sleeve-shaped portion on the booster piston in which the injection valve member is guided and a shoulder formed on the injection valve member define a second control space such that upon movement of the booster piston in one direction, the injection valve member is moved in the opposite direction.
  • a movement of the pressure piston causes a movement of the booster piston and a movement of the booster piston in turn causes a movement of the injection valve member. Since the movement of the pressure piston is not coupled with the movement of the injection valve member, unlike the first embodiment, the movement of the pressure piston is completely translated into the movement of the booster piston.
  • a second sleeve-shaped portion is formed in the second embodiment of the booster piston to form a spring chamber in which the pressure piston is guided.
  • the second sleeve-shaped portion of the booster piston and a shoulder on the pressure piston define a third control space such that upon movement of the pressure piston in the one direction of the booster piston is moved in the opposite direction.
  • the pressure in the third control chamber is increased by a movement of the shoulder on the pressure piston in the third control chamber.
  • a greater compressive force acts on the end face of the second sleeve-shaped portion, which also limits the space for the translator. Due to the increased pressure force on the end face of the second sleeve-shaped portion of this is moved out of the compiler room.
  • the shoulder of the pressure piston is moved out of the third control chamber, which increases the volume in the third control chamber.
  • the pressure in the third control chamber decreases, whereby a lower pressure force acts on the end face on the second sleeve-shaped section on the booster piston.
  • the booster piston is moved in the direction of the control room.
  • the booster piston with its sealing edge placed in the valve seat and closed the connection from the valve chamber in the fuel return.
  • the booster piston is formed in two parts.
  • a hydraulic coupling space is formed between the first part of the booster piston and the second part of the booster piston.
  • the pressure piston is guided in the first part of the booster piston and the injection valve member in the second part of the booster piston.
  • the first part of the booster piston is also the valve member of the servo valve. Due to the hydraulic coupling space, it is possible, depending on the diameter of the first part and the second part of the pressure booster piston to move the two parts with a different stroke. For example, if the cross-sectional area of the first part defining the hydraulic coupling space is larger than the area of the second part defining the hydraulic coupling space, the stroke of the second part is greater than the stroke of the first part.
  • FIG. 1 a fuel injector designed according to the invention is shown in a first embodiment.
  • An inventively designed fuel injector 1 comprises an upper housing part 3, in which an actuator 5 is received.
  • an actuator chamber 7 is formed in the upper housing part 3.
  • the actuator 5 is clamped between an upper holder 9 and a lower holder 11.
  • the necessary bias is achieved in that the upper bracket 9 and the lower bracket 11 are connected to a spring element 13.
  • the spring element 13 is preferably designed as a tube spring tension spring.
  • the lower holder 11 is connected to a pressure piston 15. This results in that the pressure piston 15 moves with the stroke of the actuator 5.
  • With the actuator 5 side facing away from the pressure piston 15 is guided in a serving as a guide bore 17 of a booster piston 19.
  • a sleeve-shaped portion 21 is formed, which encloses an injection valve member 23.
  • a control chamber 29 is limited.
  • the end face 27 of the pressure piston 15 is enclosed by a shoulder 31 on the booster piston 19.
  • the shoulder 31 and the end face 27 of the pressure piston 15 point in the same direction.
  • the booster piston 19 also serves as a valve piston of a servo valve 33.
  • a sealing edge 35 is formed on the booster piston 19.
  • the sealing edge 35 can be placed in a valve seat 36.
  • a connection of a valve chamber 37, which encloses the sleeve-shaped portion 21 of the booster piston 19, in a fuel return 39 can be opened or closed.
  • a throttle element 41 is the Control chamber 29 hydraulically connected to the valve chamber 37. With the servo valve 33 open, fuel can flow from the control chamber 29 via the throttle element 41 into the valve chamber 37 and from there into the fuel return 39.
  • the valve chamber 37 is connected via an inlet throttle 43 with a fuel inlet 45. Once the servo valve 33 is closed by the sealing edge 35 of the booster piston 19 is in the valve seat 36, fuel from the fuel inlet 45 via the inlet throttle 43 and the throttle element 41 can flow into the control chamber 29.
  • the fuel inlet 45 is generally connected to a high pressure accumulator of a common rail system.
  • the fuel inlet 45 is further connected to an annular space 47, which is formed in a lower housing part 49 and is bounded by an end face 51 of the sleeve-shaped portion 21 of the booster piston 19.
  • the annular space 47 surrounds the injection valve member 23.
  • a guide 53 is further formed, in which the injection valve member 23 is guided. So that fuel can flow from the annular space 47 into a nozzle chamber 55, open spaces 57 are formed on the injection valve member 23 in the region of the guide 53. In the area of the open spaces 57, the fuel can thus flow out of the annular space 47 into the nozzle chamber 55.
  • At least one injection opening 59 is further formed.
  • a connection from the nozzle chamber 55 to the injection port 59 can be released or closed.
  • a sealing edge 61 is formed on the injection valve member 23, which can be placed in a seat 63.
  • the connection from the nozzle chamber 55 to the at least one injection port 59 is closed.
  • the connection from the nozzle chamber 55 to the at least one injection port 59 is released and fuel is injected into a combustion chamber of an internal combustion engine.
  • the actuator 5 When the injection opening 59 is closed, the actuator 5, preferably a piezoelectric actuator, is energized and thus expanded. To start the injection process, the energization of the actuator 5 is stopped. As a result, the actuator 5 contracts.
  • the pressure piston 15, which is connected to the lower holder 11 of the actuator 5 is in Direction of the actuator 5 moves. As a result, the end face 27 of the pressure piston 15 lifts out of the control chamber 29.
  • the volume in the control chamber 29 is increased. This results in a lower pressure force acting both on the end face 25 of the injection valve member 23 and on the shoulder 31 on the booster piston 19.
  • the booster piston 19 and the injection valve member 23 are moved into the control chamber 29. This results in that the booster piston 19 moves in the opposite direction to the pressure piston 15.
  • the injection valve member 23 moves in the same direction as the pressure piston 15.
  • the booster piston 19 By the movement of the booster piston 19 simultaneously lifts the sealing edge 35 from the valve seat 36. In this way the connection from the valve chamber 37 is released into the fuel return 39.
  • fuel which has a higher pressure than the return pressure, flows from the control chamber 29 via the throttle element 41 into the valve chamber 37 and from there into the fuel return 39.
  • the pressure in the control chamber 29 continues to decrease.
  • the movement of the injection valve member 23 into the control chamber 29 is accelerated. A quick opening of the at least one injection opening 59 by lifting the sealing edge 61 of the injection valve member 23 from the seat 63 is achieved.
  • the actuator 5 is energized again.
  • the actuator 5 expands.
  • the pressure piston 15 moves into the control chamber 29.
  • the volume in the control room 29 decreases. This causes the pressure in the control chamber 29 increases.
  • the throttle element 41 is designed so that initially an increase in pressure in the control chamber 29 takes place and not the entire fuel flows due to the increased pressure in the fuel return 39.
  • the increased pressure in the control chamber 29 causes a greater pressure force on the shoulder 31 of the booster piston 19 acts.
  • the booster piston 19 is moved in the opposite direction to the pressure piston 15, whereby the sealing edge 35 is placed on the booster piston 19 in the valve seat 36.
  • the connection from the valve chamber 37 into the fuel return 39 is closed.
  • the increased pressure in the control chamber 29 causes an increased pressure force to act on the end face 25 on the injection valve 23 and the injection valve moves in the direction of the at least one injection opening 59.
  • fuel under system pressure flows from the fuel inlet 35 via the inlet throttle 43 into the valve chamber 37 and from there via the throttle element 41 into the control chamber 29.
  • the control room 29 is another Pressure build-up.
  • a further increased pressure force acts on the end face 25 of the injection valve member 23.
  • the injection valve member 23 is moved in the direction of the at least one injection port 59 and adjusts itself with the sealing edge 61 in the seat 63. In this way, the connection from the nozzle chamber 55 to the at least one injection port 59 closed. The injection process is finished.
  • FIG. 2 shows a fuel injector designed according to the invention in a second embodiment.
  • an extension 71 is formed on the injection valve member 23, which is guided in the sleeve-shaped portion 21 of the booster piston 19.
  • a shoulder 73 is formed on the injection valve member 23, which together with the injection valve member 23 enclosing end face 51 of the sleeve-shaped portion 21 of the booster piston 19 defines a second control chamber 75.
  • the shoulder 73 of the injection valve member 23 and the end face 51 of the sleeve-shaped portion 21 point in the same direction.
  • the higher pressure force generated thereby acts on the shoulder 73 of the injection valve member 23 and moves them into the control chamber 29 in the booster piston 19.
  • the injection valve member 23 lifts with the sealing edge 61 of the seat 63.
  • the compressive force on the shoulder 73 on the injection valve member 23 decreases, and the injection valve member 23 is again with the sealing edge 61 placed in the seat 63.
  • a second sleeve-shaped portion 77 is formed on the sleeve-shaped portion 21 opposite side.
  • a spring chamber 81 is limited in the second sleeve-shaped portion 77 of the pressure piston 15 is guided with an extension 79.
  • the spring chamber 81 is connected via bores 83 in the second sleeve-shaped portion 77 with the fuel return 39. As a result, the spring chamber 81 is depressurized.
  • a spring element 85 is received, which on the extension 79 on Pressure piston 15 acts.
  • the spring element 85 is preferably designed as a compression spring coil spring.
  • a shoulder 87 is formed on the pressure piston 15.
  • the shoulder 87 bounded together with an end face 89 of the second sleeve-shaped portion 77 which encloses this, a third control chamber 91.
  • the shoulder 87 of the pressure piston 15 and the end face 89 of the sleeve-shaped extension 77 are arranged on the same side of the third control chamber 91.
  • the at least one injection port 59 is closed, as long as the actuator 5 is energized and thus expanded.
  • the energization of the actuator 5 is stopped.
  • the actuator 5 contracts.
  • the pressure piston 15 fixedly connected to the actuator 5 is moved in the direction of the actuator 5.
  • the shoulder 87 of the pressure piston 15 moves into the third control chamber 91.
  • the volume in the third control space 91 is reduced.
  • the pressure in the third control chamber 91 increases.
  • On the end face 89 of the second sleeve-shaped portion 77 on the booster piston 19 acts an increased pressure force.
  • the booster piston 19 is moved from the third control chamber 91 in the direction of the injection valve.
  • the end face 51 of the sleeve-shaped portion 21 is moved into the second control chamber 75.
  • the pressure in the second control chamber 75 increases.
  • a greater pressure force acts on the shoulder 73 on the injection valve member 23.
  • the injection valve member 23 is moved out of the second control chamber 75 in the direction of the actuator.
  • the sealing edge 61 of the injection valve member 23 rises from the seat 63.
  • a connection from the nozzle chamber 55 to at least one injection port 59 is released.
  • the injection process begins.
  • the sealing edge 35 is lifted out of the valve seat 36 by the movement of the booster piston 19.
  • a connection from the valve chamber 37 in the fuel return 39 is released.
  • the actuator 5 is energized again.
  • the actuator 5 expands and the pressure piston 15 connected to the actuator is moved into the spring chamber 81.
  • the shoulder 87 is moved out of the third control chamber 91 and the volume in the third control chamber 91 increases.
  • the pressure in the third control chamber 91 thereby decreases.
  • a small pressure force acts on the end face 89 on the second sleeve-shaped extension 77 of the booster piston 19.
  • the booster piston 19 is moved into the third control chamber 91.
  • the end face 51 of the sleeve-shaped portion 21 lifts from the second control chamber 75.
  • the volume of the second control chamber 75 increases and the pressure in this decreases.
  • the injection valve member 23 On the shoulder 73 on the injection valve member 23 acts a lower pressure force, so that the injection valve member 23 is moved in the direction of the at least one injection port 59.
  • the sealing edge 61 is placed in the seat 63.
  • the movement of the injection valve member 23 is supported by a spring element 93, which is accommodated in the control chamber 29 and acts on the extension 71 on the injection valve member 23.
  • the spring element 93 is preferably designed as a compression spring coil spring.
  • FIG. 3 shows a fuel injector designed according to the invention in a third embodiment.
  • a booster piston 19 which is made in two parts.
  • the second sleeve-shaped portion 77 is executed, in which the pressure piston 15 is guided with the extension 79.
  • the second part 103 comprises the sleeve-shaped section 21, in which the extension 71 of the injection valve member 23 is guided.
  • the first part 101 and the second part 103 of the booster piston 19 are hydraulically coupled to each other via a coupling space 105.
  • the coupling space 105 is bounded on one side by an end face 107 of the first part 101.
  • On the opposite side of the control chamber 105 is limited by an end face 109 of the second part 103.
  • a channel 111 is formed in the upper housing part 3, which connects the control chamber 29 with the throttle element 41 with the valve chamber 37.
  • the fuel inlet 45 opens into the actuator chamber 7.
  • a high-pressure passage 113 is connected to the actuator chamber 7.
  • fuel under system pressure flows to the inlet throttle 43, which is connected to the valve chamber 37, and into the nozzle chamber 55.
  • it would also be possible to control the fuel feed as in FIGS FIGS. 1 and 2 shown to be realized.
  • the function of in FIG. 3 The fuel injector shown essentially corresponds to the function of in FIG. 2 illustrated fuel injector.
  • a lower pressure force acts on the end face 109 of the second part 103 of the booster piston 19 and this is moved into the coupling space 105.
  • the end face 51 of the sleeve-shaped portion 21 moves from the second control chamber 75 and increases its volume.
  • the pressure in the second control chamber 75 decreases and a lower pressure force acts on the shoulder 73 of the injection valve member 23.
  • the injection valve member 23 moves with the sealing edge 61 in the seat 63.
  • Advantage of the coupling space 105 is that depending on the cross-sectional area of the end surface 107th of the first part 101 and the end face 109 of the second part 103, a different stroke of the first part 101 and the second part 103 of the booster piston 19 can be adjusted.
  • the ratio of the strokes of the first part 101 and the second part 103 of the booster piston 19 is inversely proportional to the ratio of the cross-sectional areas 107 of the first part 101 and 109 of the second part 103 of the booster piston 19. That means that the stroke of the part 101, 103 having a smaller cross-sectional area of the end face 107, 109 is larger than the stroke of the part 101, 103 with a larger cross-sectional area of the end face 107, 109.

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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)

Claims (10)

  1. Injecteur pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne, l'injecteur (1) étant actionné au moyen d'un actionneur (5) et étant connecté à une alimentation en carburant (45), par le biais de laquelle du carburant à la pression du système est alimenté, et avec lequel au moins une ouverture d'injection (59) peut être libérée ou fermée par un organe de soupape d'injection (23), l'organe de soupape d'injection (23) étant commandé au moyen d'un piston multiplicateur (19), caractérisé en ce qu'une portion en forme de douille (21) est réalisée sur le piston multiplicateur (19), dans laquelle est guidé l'organe de soupape d'injection (23) et qui limite, conjointement avec une surface frontale (25) de l'organe de soupape d'injection (23), un espace de commande (29) et en ce que le piston multiplicateur (19) est un piston de soupape d'une servovalve (33).
  2. Injecteur selon la revendication 1, caractérisé en ce qu'une arête d'étanchéité (35) est réalisée sur le piston multiplicateur (19), laquelle peut être réglée dans un siège de soupape (36), de sorte qu'une connexion d'un espace de soupape (37) à un retour de carburant (39) puisse être libérée ou fermée.
  3. Injecteur selon la revendication 1 ou 2, caractérisé en ce que l'espace de soupape (37) est connecté hydrauliquement à l'espace de commande (29).
  4. Injecteur selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'espace de soupape (37) est connecté hydrauliquement à l'alimentation en carburant (45).
  5. Injecteur selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'un alésage (17) est réalisé dans le piston multiplicateur (19), sur le côté opposé à l'organe de soupape d'injection (23), dans lequel alésage est guidé un piston de pression (15) qui est connecté à l'actionneur (5), le piston de pression (15) limitant l'espace de commande (29) avec une surface frontale (27).
  6. Injecteur selon la revendication 5, caractérisé en ce que la surface frontale (27) du piston de pression (15) est entourée par un épaulement (31) sur le piston multiplicateur (19).
  7. Injecteur selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'un deuxième espace de commande (75) est limité par la portion en forme de douille (21) sur le piston multiplicateur (19), dans laquelle l'organe de soupape d'injection (23) est guidé, avec une surface frontale (51), et par l'organe de soupape d'injection (23) avec un épaulement (73) réalisé sur celui-ci, de sorte que lors d'un déplacement du piston multiplicateur (19) dans le deuxième espace de commande (75), la pression augmente dans ce dernier et une force de pression plus grande agisse sur l'épaulement (73) et de sorte que de ce fait l'organe de soupape d'injection (23) se déplace hors du deuxième espace de commande (75).
  8. Injecteur selon la revendication 7, caractérisé en ce qu'une deuxième portion en forme de douille (77) est réalisée sur le piston multiplicateur (19), en formant un espace de ressort (81), dans lequel est guidé le piston de pression (15), la deuxième portion en forme de douille (77) du piston multiplicateur (19) et un épaulement (87) sur le piston de pression (15) limitant un troisième espace de commande (91) de telle sorte que dans le cas d'un déplacement du piston de pression (15) dans une direction, le piston multiplicateur (19) soit déplacé dans la direction opposée.
  9. Injecteur selon la revendication 8, caractérisé en ce que l'espace de ressort (81) est connecté au retour de carburant (39).
  10. Injecteur selon l'une quelconque des revendications 7 à 9, caractérisé en ce que le piston multiplicateur (19, 101, 103) est réalisé en deux parties, un espace d'accouplement hydraulique (105) étant réalisé entre la première partie (101) et la deuxième partie (103), et le piston de pression (15) étant guidé dans la première partie (101) et l'organe de soupape d'injection (23) dans la deuxième partie (103) du piston multiplicateur (19) et la première partie (101) du piston multiplicateur (19) étant en outre l'organe de soupape de la servovalve (33).
EP20070106974 2006-06-07 2007-04-26 Injecteur de carburant doté d'une assistance adaptative à la direction Expired - Fee Related EP1865192B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610026400 DE102006026400A1 (de) 2006-06-07 2006-06-07 Kraftstoffinjektor mit Servounterstützung

Publications (3)

Publication Number Publication Date
EP1865192A2 EP1865192A2 (fr) 2007-12-12
EP1865192A3 EP1865192A3 (fr) 2009-04-29
EP1865192B1 true EP1865192B1 (fr) 2010-11-03

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Application Number Title Priority Date Filing Date
EP20070106974 Expired - Fee Related EP1865192B1 (fr) 2006-06-07 2007-04-26 Injecteur de carburant doté d'une assistance adaptative à la direction

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DE (2) DE102006026400A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006055487A1 (de) * 2006-11-24 2008-05-29 Robert Bosch Gmbh Kraftstoffinjektor
DE102009002897A1 (de) * 2009-05-07 2010-11-11 Robert Bosch Gmbh Kraftstoffinjektor
DE102011003443A1 (de) * 2011-02-01 2012-08-02 Robert Bosch Gmbh Kraftstoffinjektor
WO2013045688A1 (fr) * 2011-10-01 2013-04-04 Robert Bosch Gmbh Soupape d'injection comportant un actionneur à bain d'huile et transmission hydraulique simplifiée
EP2674608B1 (fr) * 2012-06-13 2015-08-12 Delphi International Operations Luxembourg S.à r.l. Injecteur à carburant
DE102014211469A1 (de) * 2014-06-16 2015-12-17 Robert Bosch Gmbh Düsenbaugruppe für einen Kraftstoffinjektor sowie Kraftstoffinjektor
GB2592019B (en) * 2020-02-12 2022-07-06 Delphi Tech Ip Ltd Diesel injector with an optimized valve assembly

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19939452C2 (de) * 1999-08-20 2003-04-17 Bosch Gmbh Robert Vorrichtung zur Einspritzung von Kraftstoff
DE102004005456A1 (de) 2004-02-04 2005-08-25 Robert Bosch Gmbh Kraftstoffinjektor mit direktgesteuertem Einspritzventilglied
DE102004015744A1 (de) 2004-03-31 2005-10-13 Robert Bosch Gmbh Common-Rail-Injektor

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Publication number Publication date
DE502007005524D1 (de) 2010-12-16
EP1865192A2 (fr) 2007-12-12
DE102006026400A1 (de) 2007-12-13
EP1865192A3 (fr) 2009-04-29

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