EP1662131B1 - Buse d'injection de carburant - Google Patents

Buse d'injection de carburant Download PDF

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Publication number
EP1662131B1
EP1662131B1 EP20050109688 EP05109688A EP1662131B1 EP 1662131 B1 EP1662131 B1 EP 1662131B1 EP 20050109688 EP20050109688 EP 20050109688 EP 05109688 A EP05109688 A EP 05109688A EP 1662131 B1 EP1662131 B1 EP 1662131B1
Authority
EP
European Patent Office
Prior art keywords
piston
fuel injection
nozzle needle
fuel
injection nozzle
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.)
Ceased
Application number
EP20050109688
Other languages
German (de)
English (en)
Other versions
EP1662131A1 (fr
Inventor
Friedrich Boecking
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1662131A1 publication Critical patent/EP1662131A1/fr
Application granted granted Critical
Publication of EP1662131B1 publication Critical patent/EP1662131B1/fr
Ceased 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/086—Having more than one injection-valve controlling discharge orifices
    • 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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • 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
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies

Definitions

  • the invention relates to a fuel injector according to the preamble of claim 1, such as in the DE 103 20 980 disclosed.
  • Such, for example from the DE 100 58 153 A1 known fuel injector for internal combustion engines has two nozzle needles, which can be controlled independently.
  • the outer nozzle needle is opened when the force exerted by the fuel on a pressure shoulder of the outer nozzle needle opening force is greater than the action of a closing spring.
  • the inner nozzle needle is opened by the pressure of a force acting in the closing direction on the nozzle needle hydraulic fluid is lowered in a control chamber.
  • the fuel injector according to the invention for internal combustion engines with the characterizing features of claim 1 has the advantage that the fuel injector is easy and directly controlled. By using a direct needle control both nozzle needles can be opened quickly controlled.
  • the fuel injector 1 for internal combustion engines shown in Fig. 1 has a one-piece or multi-piece, cylindrical nozzle body 2 , which projects with its free lower end into a combustion chamber not shown in detail of the engine to be supplied.
  • a guide bore 3 of the nozzle body 2 designed as a hollow needle outer nozzle needle 4 is axially displaceably guided, in which an inner nozzle needle 5 is arranged coaxially and also guided axially displaceable.
  • annular space 6 is formed, which is bounded by the outer nozzle needle 4 radially inwardly. Via a high-pressure fuel line 7 , the annular space 6 is connected to a fuel high-pressure accumulator, not shown (common rail).
  • a first closing spring 8 presses the outer nozzle needle 4 into a first sealing seat 9 at the combustion chamber end of the guide bore 3.
  • a second closing spring 12 presses the inner nozzle needle 5 into a second sealing seat 13 at the combustion chamber end of the guide bore 3.
  • a sealing cone 14 of the inner nozzle needle 5 in conjunction with the second sealing seat 13 that when open outer nozzle needle 4 fuel from the annular space 6 passes through second injection holes 15 in the combustion chamber of the internal combustion engine.
  • the two sealing seats 9, 13 are formed by a common conical surface.
  • the closing springs 8, 12 of the two nozzle needles 4, 5 are supported on a piston 16 , which is guided axially displaceably in a translator piston 17 which is open at the bottom.
  • the booster piston 17 forms the actuator of an inversely operated piezoelectric actuator 18.
  • the piezoelectric actuator 18 is energized, whereby the booster piston 17 is pressed against the action of a tension spring 19 downward.
  • the piston 16 is hydraulically coupled via a fuel-filled coupling space 20 with the booster piston 17 to allow temperature equalization of the actuator 18.
  • the two nozzle needles 4, 5 are guided in each case displaceably on the piston 16.
  • the piston 16 has a downwardly open, annular piston chamber, on whose outer-side chamber wall, the outer nozzle needle 4 and at the inner-side chamber wall, the inner nozzle needle 5 is guided.
  • the piston 16 engages with an annular first projection 21, the outer nozzle needle 4 and with an annular second projection 22, the inner nozzle needle 5 in each case Opening direction.
  • the outer nozzle needle 4 is in the opening direction on the first projection 21, while the inner nozzle needle 5 is spaced in the opening direction of the second projection 22 by h 1 .
  • the two nozzle needles 4, 5 delimit each with a acting in the closing direction control surface 23, 24 in the piston chamber, a first control chamber 25 which is connected via a first throttle 26 with a second control chamber 27 and a second throttle 28 with a third control chamber 29 .
  • the second control chamber 27 is bounded radially inwardly by the piston 16, radially outward by a sealing sleeve 30, in the opening direction by the booster piston 17 and in the closing direction by the nozzle body 2.
  • About the sealing sleeve 30 of the second control chamber 27 is throttled connected to the high-pressure fuel line 7.
  • the third control chamber 29 is bounded radially inwardly by the outer nozzle needle 4, in the opening direction by the piston 16 and otherwise by the nozzle body 2.
  • the piston 16 takes over the second projection 22 and the inner nozzle needle 5 in the opening direction.
  • the inner nozzle needle 5 lifts off from its sealing seat 13, and fuel from the annular space 6 is also injected via the now released second injection holes 15 into the combustion chamber. Since the rail pressure in the opening direction also acts on the sealing cone 14 of the inner nozzle needle 5, the inner nozzle needle 5 lifts off from the second projection 22 and is opened up against the action of the closing spring 12.
  • the nozzle needles 4, 5 are displaced by energizing the actuator 18 of the booster piston 16 and the piston 16 against the action of the tension spring 19 in the closing direction, whereby the volume of the control chambers 25, 27, 29 decreases.
  • the prevailing pressure rises above the rail pressure, and the nozzle needles 4, 5 close.
  • the two throttles 26, 28 can be used via a slider effect as a flow control.
  • the throttle 28 is formed by a provided in the outer nozzle needle 4 throttle bore, which opens on the outer circumferential surface of the outer nozzle needle 4 and is closed by a certain opening stroke of the outer nozzle needle 4 by a control edge 31 of the piston 16.
  • the overpressure prevailing in the first control chamber 25 can be reduced via the third control chamber 29. This leads to a faster closing of the nozzle needles 4, 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (10)

  1. Injecteur de carburant (1) de moteur à combustion interne comprenant un corps d'injecteur (2) muni d'orifices d'injection (11, 15), une aiguille d'injecteur (4) extérieure, réalisée en forme d'aiguille creuse, guidée axialement dans un perçage de guidage (3) du corps d'injecteur (2), cette aiguille commandant l'injection de carburant sous haute pression par au moins un premier orifice d'injection (11),
    une aiguille d'injecteur (5), intérieure, guidée coaxialement dans l'aiguille d'injecteur extérieure (4), cette aiguille intérieure commandant l'injection de carburant sous haute pression à travers au moins un second orifice d'injection (15),
    caractérisé par
    - un piston 16 guidé en coulissement axial ayant une première saillie (21) qui entraîne l'aiguille extérieure (4) dans le sens de l'ouverture et une seconde saillie (22) qui, après une avancée hl, entraîne l'aiguille intérieure (5) dans le sens de son ouverture,
    - un actionneur (18) pour coulisser le piston (16),
    - une première chambre de commande (25) remplie de carburant, délimitée chaque fois par une surface de commande (23, 24) agissant dans le sens de fermeture des deux aiguilles d'injecteur (4, 5),
    - une seconde chambre de commande (27) remplie de carburant, délimitée dans le sens de l'ouverture par le piston (16) ou par un élément d'actionnement de l'organe d'actionnement (16) et reliée par un organe d'étranglement (26) à la première chambre de commande (25),
    l'aiguille intérieure et l'aiguille extérieure (4, 5) étant coulissantes par rapport au piston 16 dans le sens de l'ouverture, respectivement, contre l'action d'un ressort de fermeture (8, 12).
  2. Injecteur de carburant selon la revendication 1,
    caractérisé par
    une troisième chambre de commande (29) remplie de carburant, cette chambre étant délimitée par le piston (16) ou un élément d'actionnement de l'actionneur (18) et cette chambre est reliée par un organe d'étranglement (28) à la première chambre de commande (25).
  3. Injecteur de carburant selon la revendication 2,
    caractérisé en ce que
    l'organe d'étranglement (28) de la troisième chambre de commande (29) est formé par un perçage d'étranglement prévu dans l'aiguille extérieure (5), ce perçage étant fermé pour une course d'ouverture supérieure à l'avancée h1 de l'arête de commande (31) du piston (16).
  4. Injecteur de carburant selon l'une des revendications précédentes,
    caractérisé en ce que
    le piston (16) a une chambre à piston, annulaire, ouverte dans le sens de la fermeture et, dans cette chambre, les deux aiguilles (4, 5) délimitent chacune par sa surface de commande (23, 24) la première chambre de commande (25).
  5. Injecteur de carburant selon la revendication 4,
    caractérisé en ce que
    l'aiguille extérieure (4) est guidée par la paroi, côté extérieur, de la chambre à piston.
  6. Injecteur de carburant selon la revendication 4 ou 5,
    caractérisé en ce que
    l'aiguille intérieure (5) est guidée contre la paroi, côté intérieur, de la chambre à piston.
  7. Injecteur de carburant selon l'une des revendications précédentes,
    caractérisé en ce que
    le ressort de fermeture (8) de l'aiguille extérieure (4) est appuyé contre le piston (16).
  8. Injecteur de carburant selon l'une des revendications précédentes,
    caractérisé en ce que
    le ressort de fermeture (12) de l'aiguille intérieure (5) est appuyé contre le piston (16).
  9. Injecteur de carburant selon l'une des revendications précédentes,
    caractérisé en ce que
    l'actionneur (18) comporte comme élément d'actionnement un piston démultiplicateur (17) couplé en mouvement de manière hydraulique avec le piston (16).
  10. Injecteur de carburant selon l'une des revendications précédentes,
    caractérisé en ce que
    l'actionneur (18) est un moyen d'entraînement piézoélectrique commandé contre l'action d'un ressort de traction (19).
EP20050109688 2004-11-26 2005-10-18 Buse d'injection de carburant Ceased EP1662131B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200410057244 DE102004057244A1 (de) 2004-11-26 2004-11-26 Kraftstoffeinspritzdüse

Publications (2)

Publication Number Publication Date
EP1662131A1 EP1662131A1 (fr) 2006-05-31
EP1662131B1 true EP1662131B1 (fr) 2008-01-23

Family

ID=35414981

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20050109688 Ceased EP1662131B1 (fr) 2004-11-26 2005-10-18 Buse d'injection de carburant

Country Status (2)

Country Link
EP (1) EP1662131B1 (fr)
DE (2) DE102004057244A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10010863A1 (de) * 2000-03-06 2001-09-27 Bosch Gmbh Robert Einspritzdüse
DE10034444A1 (de) * 2000-07-15 2002-01-24 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10058153A1 (de) 2000-11-22 2002-06-06 Bosch Gmbh Robert Einspritzdüse mit separat steuerbaren Düsennadeln
DE10320980A1 (de) * 2003-05-09 2004-11-25 Robert Bosch Gmbh Verfahren zur Mehrfachansteuerung eines Kraftstoffinjektors mit Variodüse

Also Published As

Publication number Publication date
EP1662131A1 (fr) 2006-05-31
DE502005002645D1 (de) 2008-03-13
DE102004057244A1 (de) 2006-06-01

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