EP2275667B1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
EP2275667B1
EP2275667B1 EP20100162914 EP10162914A EP2275667B1 EP 2275667 B1 EP2275667 B1 EP 2275667B1 EP 20100162914 EP20100162914 EP 20100162914 EP 10162914 A EP10162914 A EP 10162914A EP 2275667 B1 EP2275667 B1 EP 2275667B1
Authority
EP
European Patent Office
Prior art keywords
control valve
chamber
fuel injection
pressure
control
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
EP20100162914
Other languages
German (de)
English (en)
Other versions
EP2275667A1 (fr
Inventor
Andreas Gruenberger
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
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2275667A1 publication Critical patent/EP2275667A1/fr
Application granted granted Critical
Publication of EP2275667B1 publication Critical patent/EP2275667B1/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
    • 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
    • F02M63/0015—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
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0073—Pressure balanced 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/042—The valves being provided with fuel passages

Definitions

  • the invention relates to a fuel injection valve for internal combustion engines for injecting fuel under high pressure, with a nozzle needle which cooperates by its longitudinal movement with a valve seat and thereby at least one injection opening opens and closes, wherein the nozzle needle by the pressure in a nozzle needle control chamber in the direction of the valve seat directed closing force, and with a control valve, by which the pressure in the nozzle needle control chamber is adjustable and which includes a control valve chamber in which a control valve member is arranged longitudinally movable and opens by its longitudinal movement, a connection of the control valve chamber with a leakage oil chamber and closes.
  • Fuel injection valves as they are preferably used for fuel injection directly into the combustion chamber of an internal combustion engine, are known.
  • compressed fuel is made available in a so-called rail by means of a high-pressure pump and injected by means of injectors into the respective combustion chambers of an internal combustion engine.
  • the injection is controlled by means of a nozzle needle, which performs a longitudinal movement and thereby opens and closes one or more injection openings.
  • a fuel injection device comprising a control valve comprising a control valve member which is movably guided and projects into a control valve space.
  • the object of the invention is to provide a fuel injection valve according to the preamble of claim 1, which is simple in construction and inexpensive to produce.
  • the object is with a fuel injection valve for internal combustion engines for the injection of fuel under high pressure, with a nozzle needle, which cooperates by its longitudinal movement with a valve seat and thereby opens and closes at least one injection port, wherein the nozzle needle by the pressure in a nozzle needle control chamber in the direction of Valve seat directed closing force undergoes, and with a control valve, by which the pressure in the nozzle needle control chamber is adjustable and which comprises a control valve chamber in which a control valve member is arranged longitudinally movable and opens by its longitudinal movement, a connection of the control valve chamber with a leakage oil chamber, thereby in that the control valve member has a guide section with which the control valve member is guided longitudinally movably outside the control valve chamber and from which the control valve member extends into the control valve chamber.
  • control valve space a space within the fuel injection valve is referred to, which is acted upon by a control valve chamber pressure, which is also referred to as control pressure.
  • control valve chamber pressure which is also referred to as control pressure.
  • the control valve chamber can be made significantly smaller than in an embodiment in which the control valve member is guided in a sealing sleeve which is arranged in the control valve chamber.
  • the hydraulic sealing assistance may vary depending on the pressure with which the fuel is injected from the fuel injection valve, which is also referred to as rail pressure.
  • a throttle plate comprises a blind hole in which the control valve member is guided with the guide portion and in which a leak oil channel opens.
  • the blind hole is preferably designed as a longitudinal bore in the throttle plate.
  • the opening into the blind hole return channel or leakage channel is preferably designed as a transverse bore and allows for a movement of the control valve member into the blind hole in a pressure reduction in the blind hole.
  • the throttle plate has substantially the shape of a circular disk with a plurality of through holes and / or blind holes.
  • a preferred embodiment of the fuel injection valve is characterized in that the control valve member has a shoulder, which is acted upon by the control valve chamber pressure, that a hydraulic closing force is applied to the control valve member.
  • Another preferred embodiment of the fuel injection valve is characterized in that a control valve spring is biased against the shoulder.
  • the control valve spring By the control valve spring, the control valve member is in its closed position biased, in which the connection of the control valve chamber is interrupted or closed with the leakage oil space.
  • control valve member has a shoulder facing away from the sealing body, which cooperates with a control valve seat to open the connection of the control valve chamber with the leakage oil space and close.
  • a sealing edge or sealing surface is formed, which can come into sealing contact with a sealing surface or sealing edge to represent the valve seat.
  • a further preferred embodiment of the fuel injection valve is characterized in that the sealing body can be acted upon or acted upon by an actuator, by means of which the control valve can be actuated.
  • the actuator is, for example, a piezoelectric actuator or a magnetic actuator.
  • a further preferred exemplary embodiment of the fuel injection valve is characterized in that the area of the sealing body acted upon in the closed state of the control valve member against the closing direction is less than or equal to the area of the shoulder which is acted upon in the closing direction by the control valve chamber pressure. If the areas are equal, then the control valve member is pressure balanced. If, in the closed state of the control valve member, the surface of the sealing body acted upon by the control valve chamber pressure against the closing direction is smaller than the area of the shoulder acted upon in the closing direction by the control valve chamber pressure, then a hydraulic closing force acts on the control valve member.
  • a further preferred embodiment of the fuel injection valve is characterized in that the throttle plate comprises a drain channel which connects the nozzle needle control chamber with the control valve chamber.
  • the drainage channel is preferably provided with an outlet throttle.
  • the throttle plate further comprises an inlet channel with an inlet throttle, via which the nozzle needle control chamber is filled with fuel from a central high-pressure fuel storage or a central high-pressure fuel source.
  • control valve space is recessed in a valve plate which is mounted on the throttle plate.
  • the two plates which may also be embodied as bodies or disks, are attached to one another such that the blind hole for guiding the control valve member opens into the control valve chamber.
  • the guided in the throttle plate control valve member projects with the sealing body in the control valve chamber of the valve plate, which also has the control valve seat.
  • FIGS. 1 and 2 show a fuel injection valve 1 according to the invention in longitudinal section.
  • the fuel injection valve 1 has a holding body 2, a valve body or a valve plate 4, a throttle plate or throttle plate 6, and a nozzle body 8 abutting each other in this order.
  • the components are pressed against each other by a clamping nut 9, which is supported on a shoulder of the nozzle body 8 and is held by a thread on the holding body 2.
  • a pressure chamber 14 is formed, in which a piston-shaped nozzle needle 10 is arranged longitudinally displaceable.
  • the nozzle needle 10 has at its end facing the combustion chamber on a sealing surface 11, with which it cooperates with a valve seat or nozzle seat 13 which is formed at the combustion chamber end of the pressure chamber 14.
  • nozzle seat 13 From the nozzle seat 13 go from one or more injection ports 12, which open in installation position of the fuel injection valve 1 directly into a combustion chamber of an internal combustion engine.
  • the nozzle needle 10 is guided in a middle section in the pressure chamber 14, wherein the fuel is passed through a plurality of bevels 15 to the injection openings 12.
  • the nozzle needle 10 is guided at its end remote from the valve seat in a sleeve 22, wherein the sleeve 22 by a closing spring 18, which surrounds the nozzle needle 10 and the sleeve 22 is supported on a shoulder 16, pressed against the throttle plate 6.
  • a nozzle needle control chamber 20 is limited, which is filled with fuel, so that by the pressure in the nozzle needle control chamber 20, a hydraulic force is exerted on the valve seat facing away from the end of the nozzle needle 10 and a force in the direction of the nozzle seat 13 on the nozzle needle 10 exerts.
  • an inlet channel 25 is formed, is passed through the compressed fuel under high pressure from a high-pressure fuel source in the pressure chamber 14.
  • An inlet channel or high-pressure channel 25 comprising a plurality of sections 24, 25, 26 is connected to the control chamber 20 via an inlet channel 39 extending in the throttle plate 6 connected to an inlet throttle 40.
  • a control valve 30 is provided in the valve body 4, wherein the control valve 30 has a control valve chamber 31 which is formed as a cavity in the valve body 4.
  • the control valve chamber 31 is connected to the nozzle needle control chamber 20 in the nozzle body 6 via a drain channel with an outlet throttle 42, which is formed in the throttle plate 6.
  • a control valve member 34 which is designed as a valve pin or valve piston 45.
  • the valve pin 45 has at its end close to the combustion chamber a guide portion 44, with which the valve pin 45 and the control valve member 34 is guided reciprocally movable in a blind hole 46 of the throttle plate 6.
  • a leakage oil channel 49 opens into the blind hole 46.
  • the leakage oil channel 49 which is also referred to as a return channel, communicates with a pressure relief space, which is acted upon, for example, by ambient pressure.
  • the control valve member 34 includes a central blind hole 50 which extends from the combustion chamber near the end of the valve pin 45 to a sealing body 52 which is formed at the combustion chamber remote end of the control valve member 34.
  • the sealing body 52 is provided with a sealing surface or sealing edge which cooperates with a sealing edge or sealing surface on the valve body 4 to represent a control valve seat 54.
  • the control valve seat 54 When the sealing body 52 is tight against the valve body, the control valve seat 54 is closed. When the sealing body 52 lifts from the valve body 4, that is, when the control valve member 34 with the sealing body 52 from his in FIG. 1 shown closed position downwards, ie to the nozzle needle 10, moves, then the control valve seat 54 is opened and released a connection from the control valve chamber 31 into a leakage oil chamber 55.
  • the leakage oil chamber 55 which is also referred to as the return chamber, is like the drain channel or return channel 41 with the pressure relief chamber in connection.
  • the control valve member 34 is actuated by an actuator 60, which is designed for example as a piezoelectric actuator. At the combustion chamber near the end of the actuator 60, a nose 61 is formed, which rests with its free end on the sealing body 52 and can be brought to bear.
  • the control valve member 34 further includes a collar 64 which is integrally connected on its side facing away from the combustion chamber with the sealing body 52.
  • the sealing body 52 may alternatively be designed as a separate component.
  • the collar 64 On its side facing the combustion chamber, the collar 64 forms a shoulder 65, against which a valve spring 68 abuts and which is acted upon by the control valve chamber pressure.
  • the valve spring 68 is clamped in an annular space in the axial direction between the shoulder 65 and the throttle plate 6 and preferably designed as a helical compression spring.
  • the fuel injection device 1 is supplied via the inlet channel 24 to 26 with high-pressure fuel.
  • This high pressure is also referred to as rail pressure.
  • the rail pressure enters the nozzle needle control chamber 20 via the inlet channel 39 with the inlet throttle 40. Via the outlet channel 41 with the outlet throttle 42, the rail pressure enters the control valve chamber 31.
  • the control valve member 34 may be designed to be balanced. In a force-balanced control valve member 34 which is opposite to the closing direction, that is in FIG. 1 down, acted upon by the Steuerventilraumtik surface of the sealing body 52 as large as that in the closing direction, ie in FIG. 1 To achieve pressure support during closing, the surfaces must be adapted accordingly, that is, the pressurized surface of the shoulder 65 must be made larger than the pressurized surface of the sealing body 52.
  • the actuator 60 which is preferably embodied as a piezoactuator, it expands, so that the control valve member 34 moves downwards with the sealing body 52.
  • the connection between the control valve chamber 31 and the leakage oil chamber or return chamber 55 is released via the control valve seat 54.
  • the pressure in the control valve chamber 31 and via the drainage channel 41 with the outlet throttle 42 is also lower in the nozzle needle control chamber 20, as a result of which the nozzle needle 10 moves out of its nozzle seat 13.
  • an injection of fuel from the pressure chamber 14 through the injection holes or injection openings 12 is triggered.
  • control valve member 34 is closed by the biasing force of the valve spring 68 and optionally by a resulting from a set area ratio hydraulic closing force, so that the control valve chamber 31 via the drain passage 41 with the outlet throttle 42 with Fuel from the nozzle needle control chamber 20 is filled. Due to the increasing pressure in the nozzle needle control chamber 20, the nozzle needle closes.

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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 (8)

  1. Soupape d'injection de carburant pour moteurs à combustion interne, pour injecter du carburant à haute pression, comprenant une aiguille d'injection (10) qui, par son déplacement longitudinal, coopère avec un siège de soupape (13) et ouvre et ferme ainsi au moins une ouverture d'injection (12), l'aiguille d'injection (10) subissant, du fait de la pression dans un espace de commande d'aiguille d'injection (20), une force de fermeture orientée en direction du siège de soupape (13), et comprenant une soupape de commande (30) au moyen de laquelle la pression dans l'espace de commande d'aiguille d'injection (20) peut être réglée et qui comporte un espace de soupape de commande (31) dans lequel un organe de soupape de commande (34) est disposé de manière mobile longitudinalement et ouvre et ferme, par son déplacement longitudinal, une liaison de l'espace de soupape de commande (31) à un espace d'huile de fuite (55), l'organe de soupape de commande (34) comprenant une partie de guidage (44) à l'aide de laquelle l'organe de soupape de commande (34) est guidé de manière mobile longitudinalement à l'extérieur de l'espace de soupape de commande (31) et à partir de laquelle l'organe de soupape de commande (34) s'étend à l'intérieur de l'espace de soupape de commande (31), caractérisée en ce que la plaque d'étranglement (6) comporte un trou borgne (46) dans lequel l'organe de soupape de commande (34) est guidé à l'aide de la partie de guidage (44) et dans lequel débouche un conduit d'huile de fuite (49).
  2. Soupape d'injection de carburant selon la revendication 1, caractérisée en ce que l'organe de soupape de commande (34) comprend un épaulement (65) qui est sollicité par la pression de l'espace de soupape de commande de telle sorte qu'une force de fermeture hydraulique est appliquée sur l'organe de soupape de commande (34).
  3. Soupape d'injection de carburant selon la revendication 2, caractérisée en ce qu'un ressort de soupape de commande (68) est précontraint contre l'épaulement (65).
  4. Soupape d'injection de carburant selon la revendication 2 ou 3, caractérisée en ce que l'organe de soupape de commande (34) comprend un corps d'étanchéité (52) opposé à l'épaulement (65), lequel corps d'étanchéité coopère avec un siège de soupape de commande (54) pour ouvrir et pour fermer la liaison de l'espace de soupape de commande (31) à l'espace d'huile de fuite (55).
  5. Soupape d'injection de carburant selon la revendication 4, caractérisée en ce que le corps d'étanchéité (52) peut être sollicité par un actionneur (60) au moyen duquel la soupape de commande (30) peut être actionnée.
  6. Soupape d'injection de carburant selon la revendication 4 ou 5, caractérisée en ce que la surface du corps d'étanchéité (52) qui est, à l'état fermé de l'organe de soupape de commande (34), sollicitée par la pression de l'espace de soupape de commande en sens inverse à la direction de fermeture est inférieure ou égale à la surface de l'épaulement (65) qui est sollicitée par la pression de l'espace de soupape de commande dans la direction de fermeture.
  7. Soupape d'injection de carburant selon la revendication 1, caractérisée en ce que la plaque d'étranglement (6) comporte un conduit d'évacuation (41) qui relie l'espace de commande d'aiguille d'injection (20) à l'espace de soupape de commande (31).
  8. Soupape d'injection de carburant selon la revendication 1 ou 7, caractérisée en ce que l'espace de soupape de commande (31) est évidé dans une plaque porte-soupape (4) qui est montée sur la plaque d'étranglement (6).
EP20100162914 2009-07-15 2010-05-17 Soupape d'injection de carburant Not-in-force EP2275667B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910027709 DE102009027709A1 (de) 2009-07-15 2009-07-15 Kraftstoffeinspritzventil

Publications (2)

Publication Number Publication Date
EP2275667A1 EP2275667A1 (fr) 2011-01-19
EP2275667B1 true EP2275667B1 (fr) 2013-09-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20100162914 Not-in-force EP2275667B1 (fr) 2009-07-15 2010-05-17 Soupape d'injection de carburant

Country Status (2)

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EP (1) EP2275667B1 (fr)
DE (1) DE102009027709A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010038451A1 (de) * 2010-07-27 2012-02-02 Robert Bosch Gmbh Brennstoffeinspritzventil

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002364483A (ja) * 2001-06-07 2002-12-18 Denso Corp 燃料噴射装置
DE102006050163A1 (de) * 2006-10-25 2008-04-30 Robert Bosch Gmbh Injektor mit axial-druckausgeglichenem Steuerventil
DE102008001330A1 (de) * 2008-04-23 2009-10-29 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen

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Publication number Publication date
DE102009027709A1 (de) 2011-01-20
EP2275667A1 (fr) 2011-01-19

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