EP1825137A1 - Injecteur de carburant - Google Patents

Injecteur de carburant

Info

Publication number
EP1825137A1
EP1825137A1 EP05808077A EP05808077A EP1825137A1 EP 1825137 A1 EP1825137 A1 EP 1825137A1 EP 05808077 A EP05808077 A EP 05808077A EP 05808077 A EP05808077 A EP 05808077A EP 1825137 A1 EP1825137 A1 EP 1825137A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
piston
fuel
opening direction
needle
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.)
Granted
Application number
EP05808077A
Other languages
German (de)
English (en)
Other versions
EP1825137B1 (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 EP1825137A1 publication Critical patent/EP1825137A1/fr
Application granted granted Critical
Publication of EP1825137B1 publication Critical patent/EP1825137B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies

Definitions

  • Such, for example, from DE 100 58 153 A1 known fuel injector for internal combustion engines has two nozzle needles that 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.
  • the separate structure of the control via separate control chambers of the two nozzle needles is particularly advantageous.
  • a direct needle control By using a direct needle control, both nozzle needles can be opened quickly without leakage and thus the injector can be optimally controlled.
  • Advantage of the invention is the freedom from leaks at high needle speed and short travel of the actuator.
  • FIGURE shows the fuel injection nozzle according to the invention in a longitudinal section.
  • 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.
  • an 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 sealing cone 10 of the outer nozzle needle 4 in conjunction with the first sealing seat 9, that fuel from the annular space. 6 passes through first injection holes 11 in the combustion chamber of the internal combustion engine.
  • 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.
  • the inner nozzle needle 5 In the closed state of the inner nozzle needle 5 prevents a sealing cone 14 of the inner nozzle needle 5 in conjunction with the second sealing seat 13 that fuel both with closed outer nozzle needle 4 from the existing between the two nozzle needles 4, 5 annular gap 15 which is connected via a bore 16 in the outer nozzle needle 5 to the annulus 6, and not open at the second outer nozzle needle 4 through second injection holes 17 in the combustion chamber Internal combustion engine passes.
  • the two sealing seats 9, 13 are formed by a common conical surface.
  • the closing spring 8 of the outer nozzle needle 4 is supported on the nozzle body 2 and the closing spring 12 of the inner nozzle needle 5 on a piston 18 which is guided axially displaceably in a translator piston 19 open at the bottom.
  • the piezoelectric actuator 20 is energized, whereby the booster piston 19 is pressed down against the action of a tension spring (e.g., Bourdon tube) 21.
  • the piston 18 is hydraulically coupled to the booster piston 19 via a booster chamber 22, which is filled with fuel under rail pressure, to allow for a 1: 1 temperature compensation of the actuator 20.
  • the two nozzle needle 4, 5 are each guided displaceably on the piston 18.
  • the piston 18 has a downwardly open piston chamber, on the chamber wall the two nozzle needles 4, 5 are guided.
  • the piston 18 engages with an annular first projection 23, the inner nozzle needle 5 and with an annular second projection 24, the outer nozzle needle 4 respectively in the opening direction.
  • the inner nozzle needle 5 delimits, with a control surface 25 acting in the closing direction, in the piston chamber a first nozzle rear space 26, which is connected via a first throttle 27 to a first control chamber 28.
  • the first control chamber 28 is bounded radially inwardly by the piston 18, radially outward by a sealing sleeve 29, in the opening direction by the booster piston 19 and in the closing direction by the nozzle body 2.
  • the sealing sleeve 29 which is supported by a housing side supported compression spring (not shown) in abutment against a shoulder of the nozzle body 2, the first control chamber 28 is throttled connected to the high-pressure fuel line 7.
  • the outer nozzle needles 4 with a control surface 30 acting in the closing direction in the piston chamber define a second nozzle rear space 31, which is connected via a second throttle 32 to a second control chamber 33.
  • the second control chamber 33 is bounded radially inwardly by the outer nozzle needle 4, in the opening direction by the piston 18 and otherwise by the nozzle body 2.
  • the second control chamber 33 is connected in a manner not shown throttled to the high-pressure fuel line 7, e.g. also via a sealing sleeve.
  • the intermediate space 34, which is formed in the piston chamber between the second projection 24 and the outer nozzle needle 4, is connected via a connecting bore 35 in the outer nozzle needle 4 to a second control chamber 31.
  • the two nozzle needles 4, 5 are opened wide with only minimal opening stroke of the actuator 20.
  • nozzle needles 4, 5 are moved by energizing the actuator 20 of the booster piston 19 and the piston 18 against the action of the tension spring 21 in the closing direction, whereby the volume of the control chambers 28, 33 is reduced.
  • the prevailing pressure in each case rises above the rail pressure, and the nozzle needles 4, 5 close.
  • the opening of the two nozzle needles can also be reversed if h 0 and hi are reversed, ie if h 0 >hi> 0.

Landscapes

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

Abstract

L'invention concerne un injecteur de carburant (1) destiné à un moteur à combustion interne. Cet injecteur comprend un corps d'injecteur (2) doté de trous d'injection (11, 17), une aiguille d'injecteur externe (4) qui est guidée axialement dans un orifice de guidage (3) du corps d'injecteur (2), qui est réalisée sous la forme d'une aiguille creuse et qui commande l'injection de carburant sous haute pression par au moins un premier trou d'injection (11) ; et une aiguille d'injecteur interne (5) qui est guidée coaxialement dans l'aiguille d'injecteur externe (4) et qui commande l'injection de carburant sous haute pression par au moins un deuxième trou d'injection (17). Selon l'invention, cet injecteur comprend également un piston (18) axialement mobile et guidé, doté d'une première saillie (23) qui entraîne l'aiguille d'injecteur interne (5) dans sa direction d'ouverture et d'une deuxième saillie (24) qui, après une précourse (h<SUB>1</SUB>), entraîne l'aiguille d'injecteur externe (4) dans sa direction d'ouverture ; un mécanisme de réglage (20) permettant de déplacer le piston (18) ; un premier et un deuxième compartiment de retour d'injection (26, 31) respectivement délimités par une surface de commande (25, 30) active dans la direction de fermeture, de l'aiguille interne ou de l'aiguille externe (4, 5) ; un premier compartiment de commande (28) qui est rempli de carburant, délimité dans la direction d'ouverture par le piston (18) ou un actionneur (19) du mécanisme de réglage (20), et relié au premier compartiment de retour d'injection (26) par un étranglement (27) ainsi qu'un deuxième compartiment de commande (33) qui est rempli de carburant, délimité dans la direction d'ouverture par le piston (18) et relié au deuxième compartiment de retour d'injection (31) par un étranglement (32). Les deux aiguilles d'injecteur (4, 5) se déplacent par rapport au piston (18) dans la direction d'ouverture respectivement à l'encontre de l'action d'un ressort de fermeture (8, 12).
EP05808077A 2004-11-26 2005-10-31 Injecteur de carburant Expired - Fee Related EP1825137B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410057245 DE102004057245A1 (de) 2004-11-26 2004-11-26 Kraftstoffeinspritzdüse
PCT/EP2005/055653 WO2006056521A1 (fr) 2004-11-26 2005-10-31 Injecteur de carburant

Publications (2)

Publication Number Publication Date
EP1825137A1 true EP1825137A1 (fr) 2007-08-29
EP1825137B1 EP1825137B1 (fr) 2008-03-19

Family

ID=35485481

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05808077A Expired - Fee Related EP1825137B1 (fr) 2004-11-26 2005-10-31 Injecteur de carburant

Country Status (3)

Country Link
EP (1) EP1825137B1 (fr)
DE (2) DE102004057245A1 (fr)
WO (1) WO2006056521A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008050382B4 (de) * 2008-10-02 2014-07-03 Motorenfabrik Hatz Gmbh & Co Kg Einspritzsystem zum Betrieb kleiner Dieselmotoren
DE102008050381B4 (de) * 2008-10-02 2014-09-25 Motorenfabrik Hatz Gmbh & Co Kg Einspritzsystem für Dieselkraftstoff über ein Common Rail (CR)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9914642D0 (en) * 1999-06-24 1999-08-25 Lucas Ind Plc Fuel injector
DE10058153A1 (de) * 2000-11-22 2002-06-06 Bosch Gmbh Robert Einspritzdüse mit separat steuerbaren Düsennadeln
JP2002221117A (ja) * 2001-01-26 2002-08-09 Denso Corp 燃料噴射弁
JP3865222B2 (ja) * 2002-03-05 2007-01-10 株式会社デンソー 燃料噴射装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006056521A1 *

Also Published As

Publication number Publication date
EP1825137B1 (fr) 2008-03-19
DE502005003396D1 (de) 2008-04-30
WO2006056521A1 (fr) 2006-06-01
DE102004057245A1 (de) 2006-06-01

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