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EP2146085B1 - Dispositif d'injection de carburant - Google Patents

Dispositif d'injection de carburant Download PDF

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Publication number
EP2146085B1
EP2146085B1 EP09100284.0A EP09100284A EP2146085B1 EP 2146085 B1 EP2146085 B1 EP 2146085B1 EP 09100284 A EP09100284 A EP 09100284A EP 2146085 B1 EP2146085 B1 EP 2146085B1
Authority
EP
European Patent Office
Prior art keywords
valve piston
pressure
fuel injection
control space
valve device
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
EP09100284.0A
Other languages
German (de)
English (en)
Other versions
EP2146085A1 (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
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
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2146085A1 publication Critical patent/EP2146085A1/fr
Application granted granted Critical
Publication of EP2146085B1 publication Critical patent/EP2146085B1/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
    • F02M63/0031—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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • 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

Definitions

  • the invention relates to a fuel injection valve device with a nozzle needle, which controls the opening of at least one injection opening by its longitudinal movement, and with a control chamber whose control chamber pressure acts at least indirectly on the nozzle needle and a reciprocating valve piston.
  • an injector with a control valve which has an axially pressure compensated valve piston (36) which is longitudinally movable by a magnetic actuator and thus affects the pressure in a control chamber.
  • the object of the invention is to provide a fuel injection valve device according to the preamble of claim 1, which is inexpensive to produce and has a long service life.
  • a fuel injection valve device with a nozzle needle, which controls the opening of at least one injection port by its longitudinal movement, and with a control chamber whose control chamber pressure acts at least indirectly on the nozzle needle and a reciprocable valve piston, achieved in that the valve piston two in Movement direction of the valve piston facing away from each other control pressure surfaces which are acted upon by the control chamber pressure.
  • a control pressure surface can be deliberately chosen to be slightly smaller in order to support the closing movement of the valve piston hydraulically.
  • a hydraulic sealing assistance or pressure support can be realized, which depends on the pressure in a central high-pressure fuel storage. By the sealing support or pressure support, the biasing force of a spring can be reduced, which serves to reset the valve piston in its closed position.
  • a preferred embodiment of the fuel injection valve device is characterized in that the valve piston has a shoulder on which one of the control pressure surfaces is formed.
  • This control pressure surface has essentially the shape of a circular disk.
  • a further preferred exemplary embodiment of the fuel injection valve device is characterized in that the control pressure surface formed on the valve piston shoulder is arranged radially within a valve seat diameter.
  • a sealing surface or a sealing edge is provided on the valve piston paragraph, which cooperates with a sealing edge or sealing surface which is provided on a housing body of the fuel injection valve device. Through the interaction of sealing surface and sealing edge a sealing seat is created, which depends on the position the valve piston is open or closed. When the seal seat is opened, the control room pressure in the control room is released into a pressure relief space.
  • a further preferred exemplary embodiment of the fuel injection valve device is characterized in that the control pressure surface formed on the valve piston shoulder defines a first partial control chamber.
  • the first partial control chamber is preferably designed as an annular space in a housing body of the fuel injection valve device.
  • the annular space is bounded radially inwardly by the valve piston.
  • a further preferred exemplary embodiment of the fuel injection valve device is characterized in that the first partial control chamber communicates with a second partial control chamber, which is delimited by a sealing sleeve at one end of the valve piston.
  • the sealing sleeve is preferably arranged on the combustion chamber near the end of the valve piston.
  • a communication passage preferably extends through the valve piston end to connect the first to the second sub-control space.
  • a further preferred embodiment of the fuel injection valve device is characterized in that the end of the valve piston is arranged with the sealing sleeve in a pressure relief space.
  • the pressure relief space is preferably in communication with a return of the fuel injection valve device.
  • a further preferred embodiment of the fuel injection valve device is characterized in that the second control pressure surface is formed at the end of the valve piston.
  • the second control pressure surface is preferably arranged as a circular surface radially inside the sealing sleeve.
  • Another preferred embodiment of the fuel injection valve device is characterized in that the sealing sleeve is guided on a housing-fixed guide pin to and fro movable.
  • the sealing sleeve is preferably held by the already mentioned spring in sealing contact with the combustion chamber near the end of the valve piston with the second control pressure surface.
  • a further preferred exemplary embodiment of the fuel injection valve device is characterized in that the guide pin comprises a connecting channel which connects the second partial control chamber to a third partial control chamber.
  • the connecting channel may be provided an outlet throttle.
  • the three sub-control rooms form together with the connecting channel or with the connecting channels the control room.
  • a further preferred exemplary embodiment of the fuel injection valve device is characterized in that the third partial control chamber is delimited by one end of the nozzle needle.
  • the nozzle needle may be one or more parts.
  • the third partial control chamber is preferably delimited by a further sealing sleeve which is remote from the combustion chamber End of the nozzle needle is guided back and forth movable.
  • FIG. 1 shows a section of a fuel injection valve device according to the invention in longitudinal section.
  • FIG. 1 a fuel injection valve device according to the invention with the fuel-supplying components is shown schematically in longitudinal section.
  • the fuel injection valve device comprises a holding body 1 and a nozzle body 2, in which a nozzle needle 3 is arranged longitudinally displaceable.
  • a nozzle needle tip 8 at the combustion chamber near the end of the nozzle needle 3 closes at least one injection opening 9, through which fuel from a pressure chamber is injected into a combustion chamber of an internal combustion engine, when the nozzle needle 3 opens.
  • a valve plate 4 and a throttle plate 5 are clamped between the holding body 1 and the nozzle body 2, a valve plate 4 and a throttle plate 5 are clamped.
  • the holding body 1, the nozzle body 2, the valve plate 4 and the throttle plate 5 together represent the housing of the fuel injection valve device, which is also referred to as an injector.
  • an inlet channel 10 which comprises three inlet channel sections 11, 12 and 13
  • high-pressure fuel passes from a central high-pressure fuel accumulator, which is also referred to as a rail, into a longitudinal bore 15 which is provided in the nozzle body 2.
  • a guide bore 18 is provided in the valve plate 4.
  • a valve piston 20 is guided to and fro movable.
  • the valve piston 20 has at its combustion chamber near end 22 a shoulder 24, which includes a first control pressure surface 26.
  • the first control pressure surface 26 has essentially the shape of a circular disk, which limits a first partial control chamber 31 of a control chamber 30 in the axial direction.
  • the first partial control chamber 31 is designed as an annular space in the valve plate 4 and is bounded radially inwardly by the valve piston 20.
  • the control chamber 30 comprises, in addition to the first partial control chamber 31, a second partial control chamber 32 and a third partial control chamber 33.
  • the first control pressure surface 26 is bounded radially outwardly by a valve seat diameter 35.
  • the valve seat diameter 35 defines a valve seat, which is formed by a sealing edge, which cooperates with a sealing surface.
  • the sealing edge may be provided on the valve piston 20 or on the valve plate 4.
  • the associated Sealing surface may be provided on the valve plate 4 or on the valve piston 20.
  • the first partial control chamber 31 communicates via a connecting channel 38 with the second partial control chamber 32 in connection.
  • the connecting channel 38 comprises at least one transverse bore and a longitudinal bore in the combustion chamber near end 22 of the valve piston 20.
  • the second part control chamber 32 is bounded in the radial direction by a sealing sleeve 40 which held by a compression spring 42 in sealing engagement with the combustion chamber near end 22 of the valve piston 20 becomes.
  • the limited by a sealing edge of the sealing sleeve 40 at the combustion chamber remote end 22 of the valve piston 20 surface represented a second control pressure surface 43, which faces the combustion chamber and the first control pressure surface 26 faces away.
  • the combustion chamber near end 22 of the valve piston 20 protrudes into a pressure relief space 44, in which the sealing sleeve 40 and the associated compression spring 42 are arranged.
  • the pressure relief chamber 44 is connected via a return passage 45 with a return of the fuel injection valve device in connection.
  • the sealing sleeve 40 is guided on a guide pin 46 movable back and forth, which starts from the throttle plate 5.
  • the guide mandrel 46 comprises a further connecting channel 48, which may contain an outlet throttle and connects the second partial control chamber 32 with the third partial control chamber 33.
  • the third partial control chamber 33 is connected via an inlet throttle channel 50 with the inlet channel 10 in connection. In the radial direction, the third part control chamber 33 is bounded by a further sealing sleeve 54, which is held by the biasing force of a nozzle needle spring 56 in sealing engagement with the throttle plate 5.
  • the pressure in the (not shown) central high-pressure fuel storage is also referred to as rail pressure or high pressure.
  • the inlet channel 12 and the inlet throttle channel 50 receives high-pressure fuel in the first part of control chamber 31.
  • About the connecting channel 48 of the high-pressure fuel into the second part control chamber 32 passes through the connecting channel 38 is supplied with high pressure fuel into the third part control chamber 31st
  • all three sub-control rooms 31 to 33 are subjected to high pressure.
  • valve piston 20 is pressure balanced. If the second control pressure surface 43 is slightly larger than the first control pressure surface 26, then the closing movement of the valve piston 20 is hydraulically assisted.
  • valve piston 20 When the valve piston 20 is actuated by means of an actuator (not shown), in particular a piezoelectric actuator is energized, then the valve piston 20 moves downward, so that at the valve seat diameter 35, a connection between the first part control chamber 31 and the pressure relief chamber 44 is released. As a result of the pressure decrease in the first partial control chamber 31, the control chamber pressure also drops in the second part control room 32 and the third part control room 33 from.
  • an actuator not shown
  • a piezoelectric actuator is energized

Landscapes

  • 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 (4)

  1. Dispositif d'injection de carburant avec une aiguille de buse (3) commandant par son mouvement longitudinal l'ouverture d'au moins une ouverture d'injection (9) et avec une chambre de commande (30) dont la pression de chambre de commande agit au moins de façon indirecte sur l'aiguille de buse (3) et un piston de soupape (20) pouvant effectuer un mouvement de va-et-vient, le piston de soupape (20) comportant deux surfaces de pression de commande (26, 43) opposées l'une par rapport à l'autre dans la direction de déplacement du piston de soupape (20) alimentées avec la pression de chambre de commande et le piston de soupape (20) comportant un épaulement de piston de soupape (24) avec une surface de pression de commande (26) réalisée contre délimitant une première chambre de commande partielle (31), caractérisé en ce que la première chambre de commande partielle (31) est reliée à la deuxième chambre de commande partielle (32) délimitée par une douille étanche (40) au niveau d'une extrémité (22) du piston de soupape (20), l'extrémité (22) du piston de soupape (20) étant disposée avec la douille étanche (40) dans une chambre de décharge de pression (44) et la deuxième chambre de commande partielle (32) étant reliée à une troisième chambre de commande partielle (33) délimitée par une extrémité de l'aiguille de buse (3) et le piston de soupape (20) ouvrant ou fermant, en fonction de sa position, une liaison prévue entre la première chambre de commande partielle (31) et la chambre de décharge de pression (44), la deuxième surface de pression de commande (43) étant réalisée au niveau de l'extrémité (22) du piston de soupape (20).
  2. Dispositif d'injection de carburant selon la revendication 1, caractérisé en ce que la surface de pression de commande (26) réalisée au niveau de l'épaulement de piston de soupape (24) est disposée dans le plan radial à l'intérieur d'un diamètre de siège de soupape (35).
  3. Dispositif d'injection de carburant selon la revendication 1, caractérisé en ce que la douille étanche (40) est guidée de façon à pouvoir effectuer un mouvement de va-et-vient sur un mandrin de guidage (46) fixé au carter.
  4. Dispositif d'injection de carburant selon la revendication 3, caractérisé en ce que le mandrin de guidage (46) comprend un canal de liaison formant la liaison entre la deuxième chambre de commande partielle (32) et la troisième chambre de commande partielle (33).
EP09100284.0A 2008-07-16 2009-05-18 Dispositif d'injection de carburant Not-in-force EP2146085B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810040454 DE102008040454A1 (de) 2008-07-16 2008-07-16 Kraftstoffeinspritzventileinrichtung

Publications (2)

Publication Number Publication Date
EP2146085A1 EP2146085A1 (fr) 2010-01-20
EP2146085B1 true EP2146085B1 (fr) 2015-07-29

Family

ID=41228269

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09100284.0A Not-in-force EP2146085B1 (fr) 2008-07-16 2009-05-18 Dispositif d'injection de carburant

Country Status (2)

Country Link
EP (1) EP2146085B1 (fr)
DE (1) DE102008040454A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4404050C1 (de) * 1994-02-09 1994-12-01 Daimler Benz Ag Injektor mit Magnetventilsteuerung für eine Brennkraftmaschine
DE10118053A1 (de) * 2001-04-11 2002-10-24 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten
DE102006050032A1 (de) 2006-10-24 2008-04-30 Robert Bosch Gmbh Injektor mit einem eine konische Hubanschlagfläche aufweisenden Steuerventil

Also Published As

Publication number Publication date
EP2146085A1 (fr) 2010-01-20
DE102008040454A1 (de) 2010-01-21

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