EP2249024B1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP2249024B1
EP2249024B1 EP10156162A EP10156162A EP2249024B1 EP 2249024 B1 EP2249024 B1 EP 2249024B1 EP 10156162 A EP10156162 A EP 10156162A EP 10156162 A EP10156162 A EP 10156162A EP 2249024 B1 EP2249024 B1 EP 2249024B1
Authority
EP
European Patent Office
Prior art keywords
valve
valve piston
chamber
nozzle needle
piston
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.)
Not-in-force
Application number
EP10156162A
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German (de)
English (en)
Other versions
EP2249024A1 (fr
Inventor
Michael Kurz
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
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Filing date
Publication date
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Publication of EP2249024A1 publication Critical patent/EP2249024A1/fr
Application granted granted Critical
Publication of EP2249024B1 publication Critical patent/EP2249024B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0049—Combined valve units, e.g. for controlling pumping chamber and injection valve
    • 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
    • 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
    • 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
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0035—Poppet valves, i.e. having a mushroom-shaped valve member that moves perpendicularly to the plane of the valve seat
    • 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
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • F02M63/0042—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing combined with valve seats of the lift valve type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/001—Control chambers formed by movable sleeves

Definitions

  • the invention relates to an actuator-controlled fuel injector.
  • Fuel injectors in which a nozzle needle is actuated by an actuator to open and close an injection port are known in the art, see example as WO 2008/017538 A1 .
  • a nozzle needle is actuated by an actuator to open and close an injection port
  • injectors In order to realize the necessary stroke of the nozzle needle, such injectors must have a certain minimum length, which can not be fallen below. Such a minimum length limits the capabilities of the injector and causes increased manufacturing and assembly costs.
  • injectors In order to reduce the length at a given stroke of the nozzle needle, injectors are known in which two actuators are connected in series. Injectors with multiple actuators connected in series are complex and expensive to manufacture.
  • An object of the invention is to provide a simple and inexpensive to produce injector, which has the shortest possible length with the largest possible stroke of the nozzle needle.
  • An injector according to the invention for injecting fuel into a combustion chamber of an internal combustion engine has a valve group which is located between a nozzle needle and an actuator, wherein a valve piston bore is formed in the valve group; a valve piston disposed in the valve piston bore that passes through the actuator between a closed position and at least one injection position is movable; a nozzle needle control space whose volume is variable by moving the valve piston; a valve space formed between the valve piston and the valve group and connected to the nozzle needle control space via a servo bore formed in the valve piston; an inlet and a drain, which open into the valve chamber, wherein the mouth of the drain is closed in the valve chamber by the valve piston when the valve piston is in the closed position and wherein the mouth of the drain is open, when the valve piston in a Injection position is located.
  • the necessary stroke of the nozzle needle can be realized with an actuator whose length is significantly reduced compared to a conventional injector.
  • the costs for the actuator can therefore be significantly reduced.
  • the drain can be made smaller than in a conventional injector, so that the control amount can be reduced.
  • the valve piston bore has a lower portion facing the nozzle needle and an upper portion facing the actuator, the lower portion having a larger cross-section than the upper portion.
  • the valve piston has a lower portion facing the nozzle needle and an upper portion facing the actuator, wherein the lower portion has a larger cross section than the upper portion and is fitted in the lower portion of the valve piston bore, that between the lower portion of the valve piston and the valve group is formed a second control chamber.
  • the second control chamber has a larger cross-section than the nozzle needle control chamber.
  • a control chamber bore is formed in the valve piston, which hydraulically connects the nozzle needle control chamber with the second control chamber.
  • a control chamber bore allows effective pressure equalization between the nozzle needle control chamber and the second control chamber.
  • valve space between the nozzle needle and the valve piston is arranged.
  • valve space is formed radially around the valve piston in the valve piston bore. This allows a particularly simple arrangement of the valve chamber and an easy-to-implement design of the inlet and outlet, which open into the valve piston bore.
  • the valve piston when the valve piston is in an injection position, the valve piston wipes the mouth of the inlet into the valve chamber, and the mouth of the inlet is opened when the valve piston is in the closed position.
  • the inlet is closed when the valve piston is in the injection position, the pressure in the valve chamber during the injection process drops very quickly. This causes a particularly fast movement of the nozzle needle when opening the injection openings and allows very short switching and injection times.
  • a servo box is formed in the servo bore.
  • an inlet or outlet throttle is formed in the inlet and / or in the outlet.
  • the actuator facing the end of the valve piston is connected to a coupler piston.
  • the coupler piston is fitted into a coupler sleeve connected to the actuator such that between the coupler piston and the coupler sleeve is formed a coupler space.
  • the coupler space makes it possible to compensate for temperature-induced changes in length of the components.
  • the actuator is a piezoelectric actuator.
  • Piezoelectric actuators are particularly reliable and have particularly short reaction times, which enable particularly fast injection processes with short switching times.
  • FIG. 1 shows a section through an embodiment of an injector 7 according to the invention.
  • FIG. 2 shows an enlarged view of the valve group of in FIG. 1 shown injector 7 in the closed state.
  • FIG. 3 shows an enlarged view of the valve group in an open state.
  • An inventive injector 7 has a in the FIG. 1 Shown above cylindrical injector body 4 and in the FIG. 1 shown below cylindrical nozzle module 1, which are clamped by a hydraulic nozzle lock nut 58 hydraulically tight.
  • the connection between the nozzle retaining nut 58 and the injector body 4 is additionally sealed by a sealing ring 60.
  • a nozzle needle chamber 56 and a fuel chamber 52 are formed, which are hydraulically connected to each other via at least one connecting bore 54.
  • Two injection openings 8 connect the fuel chamber 52 with a combustion chamber 5, which surrounds the lower end of the nozzle module 1.
  • a nozzle needle 6 is arranged in the nozzle needle chamber 56 and in the fuel chamber 52, which is movable parallel to a longitudinal axis A of the nozzle module 1 between a lower closure position and at least one upper injection position.
  • a lower closing end 10 of the nozzle needle 6 closes the injection openings 8 when the nozzle needle 6 is in the lower closing position, and releases the injection openings 8 when the nozzle needle 6 is in an upper injection position.
  • the nozzle needle chamber 56 and the fuel chamber 52 are filled with pressurized fuel. When the injection openings 8 are released, the fuel flows from the fuel chamber 52 through the injection openings 8 into the combustion chamber 5.
  • An upper control end 6a of the nozzle needle 6 is movably arranged in a control chamber sleeve 15.
  • a nozzle needle spring 12 is arranged around an upper region of the nozzle needle 6 and is supported, on the one hand, on a shoulder 11 formed on the circumference of the nozzle needle 6 and, on the other hand, on the control chamber sleeve 15.
  • the nozzle needle 6 is mounted elastically movable parallel to the longitudinal axis A in the nozzle module 1 and is pressed by the nozzle needle spring 12 in the lower closure position in which it closes the injection openings 8.
  • a valve group 2 is pressure-tight in the nozzle retaining nut 58 fitted.
  • a valve piston bore 32 is formed, in which a valve piston 16 is inserted so that it is movable parallel to the longitudinal axis A of the injector 7.
  • a nozzle needle control chamber 14 is formed, which is bounded on the one hand by the nozzle needle 6, on the other hand by the valve piston 16 and the volume of both by moving the nozzle needle 6 as well can be varied by moving the valve piston 16 parallel to the longitudinal axis A of the injector 7.
  • the valve piston 16 has a lower portion 16a facing the nozzle needle 6 and an upper portion 16b facing away from the nozzle needle 6.
  • the lower portion 16 a of the valve piston 16 in a plane which is aligned at right angles to the longitudinal axis A of the injector 7, a larger cross-section than the upper portion 16 b of the valve piston 16 and is fitted in such a manner in the lower portion of the valve piston bore 32 that on from the nozzle needle 6 side facing away from the lower portion 16a of the valve piston 16 between the valve piston 16 and the valve group 2, a second control chamber 22 is formed, the volume of which is variable by moving the valve piston 16 parallel to the longitudinal axis A.
  • the second control chamber 22 is hydraulically connected to the nozzle needle control chamber 14 through a control chamber bore 20 which extends through the lower portion 16 a of the valve piston 16.
  • valve space 24 is formed between the valve piston 16 and the valve group 2 in the valve piston bore 32, which radially surrounds the valve piston 16.
  • the valve chamber 24 is hydraulically connected to the nozzle needle control chamber 14 by a servo bore 18 formed in the valve piston 16.
  • An inlet 25 hydraulically connected to a fuel feed line 38 opens below valve space 24 in the valve piston bore 32.
  • the fuel feed line 38 is connected to a fuel pump 39, which feeds fuel under high pressure via the fuel feed line 38 into the inlet 25 and via a bore formed in the nozzle module 43 the nozzle needle chamber 56 and through the connecting bore 54 and the fuel chamber 52 filled with fuel.
  • a drain 27 connected to a fuel drain passage 34 terminates above the valve space 24 in the valve piston bore 32.
  • the fuel drain passage 34 is configured to discharge fuel from the injector 7 into a fuel intake device 36.
  • a sealing seat 30 is formed below the mouth of the drain 27 into the valve piston bore 32, which can be opened and closed by moving the valve piston 16 parallel to the longitudinal axis A of the injector 7 and so that by moving the valve piston 16, a hydraulic connection between the drain 27 and the valve chamber 24 can be produced and closed.
  • the hydraulic connection between the valve chamber 24 and the drain 27 is closed when the valve piston 16 is in the upper, closed position and the hydraulic connection is opened when the valve piston 16 is in a lower injection position.
  • a recess 17 is formed around its circumference such that the inlet 25 is hydraulically connected to the valve space 24 when the valve piston 16 is in the upper, closed position, and the valve space 24 hydraulically from the inlet 25 is disconnected when the valve piston 16 is in a lower injection position.
  • a coupler piston 48 is mounted, which is fitted in such a manner arranged above the valve group 2 coupler 44, that between the coupler piston 48 and the coupler 44, a coupler 46 is formed in the Operation is filled with fuel.
  • the volume of the coupler space is variable by moving the coupler piston 48 and / or by moving the coupler sleeve 44.
  • the coupler sleeve 44 is surrounded by a coupler spring 50, which supports the coupler sleeve 44 elastically and parallel to the longitudinal axis A movable on the valve group 2.
  • the coupler sleeve 44 is mechanically coupled to an actuator module 3, which is arranged on the side facing away from the valve group 2 side of the coupler sleeve 44, such that the coupler sleeve 44 by pressing the actuator module 3 against the force of the coupler spring 50 is movable parallel to the longitudinal axis A of the injector 7.
  • the actuator 3 In the closed state of the injector 7, i. if no fuel is to be injected into the combustion chamber 5, the actuator 3 is de-energized.
  • the coupler sleeve 44, the coupler piston 48 and the valve piston 16 are each in an upper position.
  • the sealing seat 30 between the valve chamber 24 and the drain 27 is closed.
  • the valve chamber 24 is in hydraulic communication with the inlet 25, so that in the valve chamber 24, the high system pressure of the fuel system prevails.
  • the valve chamber 24 is in hydraulic communication with the nozzle needle control chamber 14 via the servo bore 18, so that the high fuel pressure also prevails in the nozzle needle control chamber 14.
  • the nozzle needle 6 is pressed by the nozzle needle spring 12 and the pressure prevailing in the nozzle needle control chamber 14 fuel pressure in the lower, closed position in which the nozzle seat 10, the injection ports 8 closes and no fuel from the fuel chamber 52 flows into the combustion chamber 5.
  • the actuator 3 is activated by applying an electrical voltage to an electrical connection 40.
  • the actuator 3 extends and pushes the coupler piston 44 against the force of the coupler spring 50 in the direction of the valve group 2 down.
  • the coupler piston 48 is also pressed in the direction of the valve group 2.
  • the coupler piston 48 pushes the valve piston 16 within the valve piston bore 32 in the direction of the nozzle needle 6 down.
  • the volume of the nozzle needle control chamber 14 is reduced, on the other hand, the volume of the second control chamber 22 is increased.
  • the cross section A1 of the second control chamber 22 is greater than the cross section A2 of the nozzle needle control chamber 14, and the second control chamber 22 is hydraulically connected to the nozzle needle chamber 14 through the control chamber bore 20, the total volume, ie the sum of the volumes of the two control chambers 14, increases , 22, so that the pressure of the fuel in the two control chambers 14, 22 decreases.
  • the reduced pressure in the nozzle needle control chamber 14 is insufficient to keep the nozzle needle 6 in the lower, closed position against a force of the fuel in the fuel chamber 52 acting on a pressure stage 9 formed in the lower portion of the nozzle needle 6.
  • the nozzle needle 6 moves upward under the influence of the force acting on the pressure stage 9.
  • the nozzle seat 10 is opened and fuel from the fuel chamber 52 flows through the injection openings 8 into the combustion chamber 5.
  • the opening of the drain 27 and the closing of the inlet 25 causes, in addition to the previously described increase in the total volume of the control chambers 14 and 22, a further reduction in the pressure in the nozzle needle control chamber 14, whereby an additional upward force acts on the nozzle needle 6.
  • This additional force accelerates the nozzle needle 6 in addition to the direct stroke dNH, which results from the volume change of the control chambers 14, 22, so that the injection openings 8 are opened further and faster. As a result, shorter injection times can be realized.
  • the voltage applied to the actuator 3 is turned off.
  • the length of the actuator 3 decreases and the coupler sleeve 44 is pressed by the coupler spring 50 against the shortened actuator 3 upwards in the direction of the shortened actuator 3.
  • the pressure in the coupler chamber 46 decreases, and the coupler piston 48 and the valve piston 16 connected to it move upwards in the direction of the actuator 3.
  • the increased pressure in the nozzle needle control chamber 14 causes a downward force on the nozzle needle 6, which is sufficient to press the nozzle needle 6 against the force acting on the pressure step 9 upward force in the nozzle seat 10 and to close the injection openings 8. No further Fuel flows through the injection openings 8 from the fuel chamber 52 into the combustion chamber 5 and the injection process is completed.
  • the opening speed and the closing speed of the nozzle needle 6 can be adjusted as required.
  • FIG. 4 shows an alternative embodiment of the valve assembly according to the invention.
  • the inlet 25 opens directly into the valve chamber 24.
  • the hydraulic connection of the inlet 25 with the valve chamber 24 is not interrupted during the injection process.
  • the inlet throttle 26 By a suitable dimensioning of the inlet throttle 26 so the opening speed of the nozzle needle 6 can be adjusted.
  • the nozzle needle 6 can be braked when opening, to prevent the nozzle needle 6 opens faster than desired.
  • FIG. 5 shows a further alternative embodiment of the valve group 2 according to the invention, wherein in the servo bore 18 of the valve piston, a servo throttle 19 is formed.
  • a servo throttle 19 By suitable dimensioning of the servo throttle 19, the servo influence on the direct needle stroke dNH, which results from the change in the volume of the nozzle needle control chamber 14 and the second control chamber 22, can be superimposed with a time delay.
  • a better injection quality is achieved, in particular when injecting small amounts, in which a high injection tolerance and a fast switching is required. This leads to lower exhaust emissions and reduced consumption.

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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 (9)

  1. Injecteur (7) pour l'injection de carburant dans une chambre de combustion (5) d'un moteur à combustion interne, comprenant un groupe soupape (2), qui se trouve entre une aiguille d'injecteur (6) et un actionneur (3), un alésage de piston à soupape (32) étant réalisé dans le groupe soupape (2) ; un piston à soupape (16) disposé dans l'alésage de piston à soupape (32), lequel peut être déplacé par l'actionneur (3) entre une position fermée et au moins une position d'injection ; un espace de commande d'aiguille d'injecteur (14), dont le volume peut être modifié par le déplacement du piston à soupape (16) ; un espace de soupape (24), qui est réalisé entre le piston à soupape (16) et le groupe soupape (2) et qui est relié à l'espace de commande d'aiguille d'injecteur (14) par un servoalésage (18) réalisé dans le piston à soupape (16), une arrivée (25) et une sortie (27), lesquelles débouchent dans l'espace de soupape (24), l'orifice de la sortie (27) dans l'espace de soupape (24) étant fermé par le piston à soupape (16) lorsque le piston à soupape (16) se trouve dans la position fermée et l'orifice de la sortie (27) étant ouvert lorsque le piston à soupape (16) se trouve dans une position d'injection, caractérisé en ce que l'orifice de l'arrivée (26) dans l'espace de soupape (24) est fermé par le piston à soupape (16) lorsque le piston à soupape (16) se trouve dans une position d'injection, et en ce que l'orifice de l'arrivée (25) est ouvert lorsque le piston à soupape (16) se trouve dans la position fermée.
  2. Injecteur (7) selon la revendication 1, l'alésage de piston à soupape (32) présentant une zone inférieure tournée vers l'aiguille d'injecteur (6) et une zone supérieure tournée vers l'actionneur (3), la zone inférieure ayant une section transversale plus grande que la zone supérieure, et le piston à soupape (16) présentant une zone inférieure tournée vers l'aiguille d'injecteur (6) et une zone supérieure tournée vers l'actionneur (3), la zone inférieure ayant une section transversale supérieure à la zone supérieure et étant emboîtée ainsi dans la zone inférieure de l'alésage de piston à soupape (32), de sorte qu'un second espace de commande (22) est formé entre la zone inférieure du piston à soupape (16) et le groupe soupape (2).
  3. Injecteur (7) selon la revendication 2, le second espace de commande (22) ayant une section transversale plus grande que l'espace de commande d'aiguille d'injecteur (14).
  4. Injecteur (7) selon la revendication 2 ou 3, un alésage d'espace de commande (20), qui relie l'espace de commande d'aiguille d'injecteur (14) au second espace de commande (22), étant formé dans le piston à soupape (16).
  5. Injecteur (7) selon l'une quelconque des revendications 1 à 4, l'espace de soupape (24) étant formé entre l'aiguille d'injecteur (6) et le piston à soupape (16).
  6. Injecteur (7) selon la revendication 5, l'espace de soupape (24) étant formé radialement autour du piston à soupape (16) dans l'alésage de piston à soupape (32).
  7. Injecteur (7) selon l'une quelconque des revendications 1 à 6, au moins un étranglement (18, 26, 28) étant formé dans le servoalésage (17), dans l'arrivée (25) et/ou dans la sortie (27).
  8. Injecteur (7) selon l'une quelconque des revendications 1 à 7, l'extrémité, tournée vers l'actionneur (3), du piston à soupape (16) étant reliée à un piston coupleur (48), qui est emboîté dans un manchon coupleur (44) relié à l'actionneur (3), de telle sorte qu'un espace coupleur (46) est formé entre le piston coupleur (48) et le manchon coupleur (44).
  9. Injecteur (7) selon l'une quelconque des revendications 1 à 8, l'actionneur (3) étant un actionneur (3) piézoélectrique.
EP10156162A 2009-05-07 2010-03-11 Injecteur de carburant Not-in-force EP2249024B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009002897A DE102009002897A1 (de) 2009-05-07 2009-05-07 Kraftstoffinjektor

Publications (2)

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EP2249024A1 EP2249024A1 (fr) 2010-11-10
EP2249024B1 true EP2249024B1 (fr) 2011-10-19

Family

ID=42635246

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10156162A Not-in-force EP2249024B1 (fr) 2009-05-07 2010-03-11 Injecteur de carburant

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EP (1) EP2249024B1 (fr)
AT (1) ATE529628T1 (fr)
DE (1) DE102009002897A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013222504A1 (de) * 2013-11-06 2015-05-07 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
JP6993900B2 (ja) * 2018-02-26 2022-01-14 株式会社Soken 燃料噴射装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2280318T3 (es) * 2000-07-18 2007-09-16 Delphi Technologies, Inc. Inyector de combustible.
DE102006026400A1 (de) * 2006-06-07 2007-12-13 Robert Bosch Gmbh Kraftstoffinjektor mit Servounterstützung
DE102006036780A1 (de) * 2006-08-07 2008-02-21 Robert Bosch Gmbh Krafstoffinjektor mit direkter Nadelsteuerung und Servoventil-Unterstützung

Also Published As

Publication number Publication date
EP2249024A1 (fr) 2010-11-10
ATE529628T1 (de) 2011-11-15
DE102009002897A1 (de) 2010-11-11

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