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EP2282045B1 - Soupape d'injection de combustible - Google Patents

Soupape d'injection de combustible Download PDF

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Publication number
EP2282045B1
EP2282045B1 EP10161556A EP10161556A EP2282045B1 EP 2282045 B1 EP2282045 B1 EP 2282045B1 EP 10161556 A EP10161556 A EP 10161556A EP 10161556 A EP10161556 A EP 10161556A EP 2282045 B1 EP2282045 B1 EP 2282045B1
Authority
EP
European Patent Office
Prior art keywords
valve
coupler
sleeve
fuel injection
closing body
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
EP10161556A
Other languages
German (de)
English (en)
Other versions
EP2282045A1 (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
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 EP2282045A1 publication Critical patent/EP2282045A1/fr
Application granted granted Critical
Publication of EP2282045B1 publication Critical patent/EP2282045B1/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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/025—Hydraulically actuated valves draining the chamber to release the closing pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • 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

Definitions

  • the invention relates to a fuel injection valve for fuel injection systems of internal combustion engines. Specifically, the invention relates to an injector for fuel injection systems of air-compressing, self-igniting internal combustion engines.
  • a fuel injector for direct injection of diesel fuel into an internal combustion engine is known.
  • the known fuel injection valve has a valve housing consisting of a plurality of housing parts, wherein a fuel inlet nozzle is provided.
  • a channel for the passage of fuel is formed within the valve housing, which opens into a pressure chamber, which is seen in Abspritzides below a hydraulic coupler of the fuel injection valve, provided within the valve housing. From this channel branches off at the level of Hubüber GmbHs adopted an inlet throttle, is passed through the fuel from the channel into a control chamber of the hydraulic coupler.
  • the fuel injection valve according to the invention with the features of claim 1 has the advantage that a high performance, in particular a high efficiency, even at high pressures is possible. Specifically, there is the advantage that an at least largely pressure-balanced switching concept can be realized.
  • valve closing body is designed as a spherical valve closing body and / or that the valve seat surface is designed as a cone-shaped valve seat surface.
  • the valve closing body is designed as a spherical valve closing body and / or that the valve seat surface is designed as a cone-shaped valve seat surface.
  • a robust behavior against wear by particles or the like can be achieved. This is particularly advantageous in a pressure-balanced design since it is sensitive to wear.
  • a valve pin is provided which receives the valve closing body at a first end of the valve pin, that the valve pin is supported at a second end of the valve pin at least indirectly on a valve cage and that the valve sleeve is guided in the valve cage.
  • valve cage has at least one connecting bore, via which a coupler volume variable by the actuating element is connected to the valve control chamber of the coupler.
  • the actuator may be selected depending on the application.
  • the actuating field can be designed as a piezoelectric actuator or as an electromagnetic actuator.
  • valve sleeve has a guide bore, in which the guide lug is at least partially inserted, and that a guide diameter of the guide bore is at least approximately equal to a seat diameter of the sealing seat, which is formed between the valve closing body and the valve seat surface of the valve sleeve.
  • the coupler comprises a valve spring, which acts on the valve sleeve in the direction of the valve control chamber.
  • a valve spring which acts on the valve sleeve in the direction of the valve control chamber.
  • the guide lug is formed integrally with the throttle plate, wherein through the guide approach a throttle bore leads, which opens into a limited by an end face of the nozzle needle nozzle control chamber.
  • valve sleeve has a stop which is remote from the end face of the valve sleeve, and that the stop of the valve sleeve cooperates with the throttle plate to limit a slidability of the valve sleeve made possible by the guidance of the valve sleeve on the guide projection, wherein the stop the valve sleeve is formed for example by a stop surface, which faces one side of the throttle plate.
  • the displaceability of the valve sleeve can in this case be limited in the other direction by the valve cage or the like. This ensures a robust and compact design.
  • the valve pin may be supported at its second end directly on the valve cage.
  • an adjusting body is provided and that the valve pin is supported at its second end by means of the adjusting body on the valve cage.
  • the adjusting body can be formed for example by one or more shims. As a result, a precise adjustment of a valve lift of the valve closing body with respect to the valve seat surface of the valve sleeve of the coupler is possible.
  • Fig. 1 shows an embodiment of a fuel injection valve 1 in a schematic, axial sectional view.
  • the fuel injection valve 1 can serve in particular as an injector for fuel injection systems of air-compressing, self-igniting internal combustion engines.
  • the fuel injection valve 1 is suitable for a fuel injection system with a fuel rail 2, which stores diesel fuel under high pressure and to the several fuel injection valves can be connected.
  • the fuel-saving valve 1 according to the invention is also suitable for other applications.
  • the fuel injection valve 1 has a multi-part housing 3.
  • the housing 3 comprises a holding body 4, a throttle plate 5 and a nozzle body 6, which are connected to each other in a suitable manner.
  • a high-pressure channel is guided, which is connected by means of a fuel line 8 to the fuel rail 2.
  • high-pressure fuel is conducted via the high-pressure channel 7 to a fuel chamber 9 in the nozzle body 6.
  • the fuel chamber 9 is connected via a passage opening 10, which is formed in the nozzle body 6, with a further fuel chamber 11 of the nozzle body 6.
  • a nozzle needle 12 is arranged, which is guided in this embodiment within the nozzle body 6.
  • an actuating device 13 which has a piezoelectric actuator in this embodiment.
  • the actuator 13 may also be configured as an electromagnetic actuator.
  • the actuating device 13 actuates the nozzle needle 12 by means of a coupler 14.
  • the nozzle needle 12 cooperates with a valve seat surface 15, which is formed on the nozzle body 6, to form a sealing seat. Upon actuation of the nozzle needle 12, this lifts from its seat, whereby the sealing seat is opened and fuel is sprayed from the fuel chamber 11 via nozzle openings 16.
  • the actuation of the nozzle needle 12 takes place here by means of a pressure of a fuel in a nozzle control chamber 17 which is bounded by an end face 18 of the nozzle needle 12 and separated by a control chamber sleeve 19 of the fuel chamber 9.
  • a control chamber sleeve 19 of the fuel chamber 9. opens into the nozzle control chamber 17, an inlet throttle 20, which is configured in the throttle plate 5 and branches off from the high pressure passage 7.
  • the coupler 14 has a valve cage 25, a valve sleeve 26 and a valve closing body 27.
  • the valve sleeve 26 is disposed in the valve cage 25.
  • a valve pin 28 arranged in the valve cage 25 is provided.
  • the valve closing body 27 is supported on the valve cage 25 via the valve pin 28.
  • a first end 29 of the valve pin 28 receives the valve closing body 27.
  • the valve pin 28 is supported on the valve cage 25 from.
  • the throttle plate 5 has a guide projection 31, on which the valve sleeve 26 is guided along an axis 32 of the coupler 14.
  • the valve pin 28 is also guided along the axis 32 in the valve sleeve 26.
  • the valve closing body 27 is designed as a spherical valve closing body 27.
  • the first end 29 is adapted to the configuration of the valve closing body 27.
  • the valve-closure member 27 cooperates with a valve seat 33 configured on the valve sleeve to form a sealing seat.
  • the valve seat surface 33 is designed cone-shaped.
  • the coupler 14 has a coupler sleeve 35, which is supported for example by means of a biting edge on a plate-shaped part 36 of the valve cage 25.
  • a piston portion 37 of a transition piece 38 is guided, which is attached to the actuator of the actuator 13.
  • the piston section 37, the coupler sleeve 35 and the plate-shaped part 36 of the valve cage 25 delimit a coupler space 39.
  • the coupler space 39 has a variable coupler volume which can be changed by actuation of the actuation element 13.
  • the coupler volume of the coupler space 39 communicates via connecting bores 40, 41, which are configured in the plate-shaped part 36 of the valve cage 25, with a valve control space 42 within the valve cage 25.
  • the valve sleeve 26 has an end face 43.
  • the valve control chamber 42 is configured in this embodiment as an annular valve control chamber 42.
  • the valve control chamber 42 is defined by the end face 43 of the valve sleeve 26, the valve cage 25 and the second end 30 of the valve pin 28.
  • the volume of the valve control chamber 42 depends on the instantaneous position of the valve sleeve 26 within the valve cage 25.
  • the coupler 14 has a valve spring 45, which acts on the valve sleeve 26 in the direction of the valve control chamber 42.
  • the force of the valve spring 45 is therefore directed so that it acts in the direction of a reduction of the volume of the valve control chamber 42.
  • Another spring 46 acts on the coupler sleeve 35.
  • the actuating device 13 that is to say the piezoelectric actuator 13 is charged via electrical lines 47.
  • the actuator 13 expands along the axis 32.
  • the coupler volume of the coupler space 39 is thereby reduced.
  • the pressure in the coupler chamber 39 increases.
  • an increase in pressure in the valve control chamber 42 is thus achieved, with the volume of the valve control chamber 42 also increasing in relation to the reduction of the volume of the coupler chamber 39.
  • a guide diameter d of a guide bore 48 of the valve sleeve 26, in which the guide lug 31 is guided, is at least approximately the same size as a seat diameter of the sealing seat between the valve closing body 27 and the valve seat surface 33 of the valve sleeve 26.
  • the valve assembly with respect to the seat combination of the conical valve closing body 27 and the valve seat surface 33 of the valve sleeve 26 is thus at least approximately pressure balanced.
  • the hydraulic force produced by the pressure on the surface xd 2/4 is supported on the plate-shaped part 36 of the valve cage 25 via the spherical valve closing body 27, the dome-shaped first end 29 of the valve pin 28 and the valve pin 28 itself.
  • the seat diameter d of the seal seat is equal to the guide diameter d of the guide bore 48.
  • valve spring force of the valve spring 45 which presses the valve sleeve 26 against the spherical valve closing body 27, is smaller than a hydraulic force which is generated by the pressure in the valve control chamber 42 on the end face 43 of the valve sleeve 26, moves the valve sleeve 26 from that in the Fig. 1 shown position in the direction of the throttle plate 5.
  • This opens the formed between the valve closing body 27 and the valve seat surface 33 of the valve sleeve 26 sealing seat.
  • the displacement of the valve sleeve 26 is limited by abutting a stop surface 49 which forms a stop on the valve sleeve 26 against one side 50 of the throttle plate 5.
  • the valve sleeve 26 can be adjusted so far in the direction of the throttle plate 5 until the stop surface 49 rests against the side 50 of the throttle plate 5.
  • the actuator 13 is charged again, so that the volume of the coupler chamber 39 is increased again and thus reduces the pressure in the valve control chamber 42 and the volume of the valve control chamber 42 can be reduced. Due to the excess of force on the valve sleeve 26 in this case a provision of the valve sleeve 26 takes place in the in the Fig. 1 illustrated starting position in which the sealing seat formed between the valve closing body 27 and the valve seat surface 33 of the valve sleeve 26 is closed again.
  • the force for closing is here on the one hand from the valve spring force of the valve spring 45 and the other from the hydraulic force in the coupler 14, which acts on the surface (D 2 -B 2 ) x / 4, is composed.
  • the diameter D of the valve closing body 27 is equal to the inner diameter of the valve cage 25 for guiding.
  • Fig. 2 shows a partial representation of a fuel injection valve 1 in a schematic sectional view according to a second embodiment.
  • the valve pin 28 is supported in contrast to that in the Fig. 1 illustrated first embodiment not directly on the plate-shaped part 36 of the valve cage 25 from.
  • the support of the valve pin 28 on the plate-shaped part 36 of the valve cage 25 is effected indirectly, wherein between the second end 30 of the valve pin 28 and the plate-shaped part 36, an adjusting body 60 is arranged.
  • the adjusting body 60 is formed by a shim 60 partially inserted in a recess 61 in the plate-shaped member 36.
  • adjusting body 60 By selecting the adjusting body 60 from differently configured Einstellkörpem 60, a desired valve lift when operating the coupler 14 can be specified by the actuator 13. Thus, a precise adjustment of the valve lift is possible. This allows for a manufacturing tolerances are compensated. On the other hand, a simple adaptation to different applications is possible.

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 (11)

  1. Soupape d'injection de carburant (1), en particulier injecteur pour installations d'injection de carburant de moteurs à combustion interne à auto-allumage et suralimentation d'air, comprenant un dispositif de commande (13), un coupleur (14) et une aiguille d'injecteur (12), qui peut être commandée par le dispositif de commande (13) au moyen du coupleur (14),
    caractérisée en ce que
    le coupleur (14) présente une douille de soupape (26) qui est guidée sur un insert de guidage (31) d'une plaque d'étranglement (5), en ce que la douille de soupape (26) présente une surface de siège de soupape (33) qui coopère avec un corps de fermeture de soupape (27) du coupleur (14) pour produire un siège d'étanchéité, et en ce que la douille de soupape (26) présente une surface frontale (43) qui limite un espace de commande de soupape (42) du coupleur (14).
  2. Soupape d'injection de carburant selon la revendication 1,
    caractérisée en ce que
    le corps de fermeture de soupape (27) est réalisé sous forme de corps de fermeture de soupape sphérique (27) et/ou en ce que la surface de siège de soupape (33) est réalisée sous forme de surface de siège de soupape en forme d'enveloppe conique (33).
  3. Soupape d'injection de carburant selon la revendication 1 ou 2,
    caractérisée en ce que
    l'on prévoit une goupille de soupape (28) qui reçoit à une première extrémité (29) de la goupille de soupape (28) le corps de fermeture de soupape (27), en ce que la goupille de soupape (28) est supportée à une deuxième extrémité (30) de la goupille de soupape (28) au moins de manière indirecte sur une cage de soupape (25) et en ce que la douille de soupape (26) est guidée dans la cage de soupape (25).
  4. Soupape d'injection de carburant selon la revendication 3,
    caractérisée en ce que
    la goupille de soupape (28) est supportée à sa deuxième extrémité (30) au moyen d'un corps d'ajustement (60) sur la cage de soupape (25).
  5. Soupape d'injection de carburant selon la revendication 3 ou 4,
    caractérisée en ce que
    la cage de soupape (25) présente au moins un alésage de liaison (40, 41) par le biais duquel un volume du coupleur (39) pouvant être modifié par le dispositif de commande (13) est en liaison avec l'espace de commande de soupape (42) du coupleur (14).
  6. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 5,
    caractérisée en ce que
    la douille de soupape (26) présente un alésage de guidage (48) dans lequel l'insert de guidage (31) est introduit au moins en partie, et en ce qu'un diamètre de guidage (d) de l'alésage de guidage (48) est au moins approximativement égal à un diamètre de siège du siège d'étanchéité, qui est formé entre le corps de fermeture de soupape (27) et la surface de siège de soupape (33) de la douille de soupape (26).
  7. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 6,
    caractérisée en ce que
    le coupleur (14) présente un ressort de soupape (45) qui sollicite la douille de soupape (26) dans la direction de l'espace de commande de soupape (42).
  8. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 7,
    caractérisée en ce que
    l'insert de guidage (31) est réalisé d'une seule pièce avec la plaque d'étranglement (5).
  9. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 8,
    caractérisée en ce
    qu'un alésage d'étranglement (51) conduit à travers l'insert de guidage (31), et débouche dans un espace de commande d'injecteur (17) limité par une surface frontale (18) de l'aiguille d'injecteur (12).
  10. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 9,
    caractérisée en ce que
    la douille de soupape (26) présente une butée (49) qui est opposée à la surface frontale (43) de la douille de soupape (26), et en ce que la butée (49) de la douille de soupape (26) coopère avec la plaque d'étranglement (5) pour limiter un déplacement possible de la douille de soupape (26) autorisé par le guidage de la douille de soupape (26) sur l'insert de guidage (31).
  11. Soupape d'injection de carburant selon la revendication 10,
    caractérisée en ce que
    la butée de la douille de soupape (26) est formée par une surface de butée (49) qui est tournée vers un côté (50) de la plaque d'étranglement (5).
EP10161556A 2009-06-29 2010-04-30 Soupape d'injection de combustible Not-in-force EP2282045B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009027261A DE102009027261A1 (de) 2009-06-29 2009-06-29 Brennstoffeinspritzventil

Publications (2)

Publication Number Publication Date
EP2282045A1 EP2282045A1 (fr) 2011-02-09
EP2282045B1 true EP2282045B1 (fr) 2012-04-25

Family

ID=42732885

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10161556A Not-in-force EP2282045B1 (fr) 2009-06-29 2010-04-30 Soupape d'injection de combustible

Country Status (3)

Country Link
EP (1) EP2282045B1 (fr)
AT (1) ATE555302T1 (fr)
DE (1) DE102009027261A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9526522D0 (en) * 1995-12-23 1996-02-28 Lucas Ind Plc Valve arrangement
DE10118053A1 (de) * 2001-04-11 2002-10-24 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten
DE10164123A1 (de) 2001-12-24 2003-01-30 Bosch Gmbh Robert Kraftstoff-Einspritzvorrichtung
EP1612403B1 (fr) * 2004-06-30 2007-01-10 C.R.F. Società Consortile per Azioni Soupape servo pour controller l'injecteur d'un moteur à combustion interne
DE102007018042A1 (de) * 2007-04-13 2008-10-16 Robert Bosch Gmbh Injektor mit mehrteiligem Ventilelement

Also Published As

Publication number Publication date
ATE555302T1 (de) 2012-05-15
EP2282045A1 (fr) 2011-02-09
DE102009027261A1 (de) 2010-12-30

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