EP1825134B1 - Kraftstoffeinspritzdüse - Google Patents

Kraftstoffeinspritzdüse Download PDF

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Publication number
EP1825134B1
EP1825134B1 EP05815589A EP05815589A EP1825134B1 EP 1825134 B1 EP1825134 B1 EP 1825134B1 EP 05815589 A EP05815589 A EP 05815589A EP 05815589 A EP05815589 A EP 05815589A EP 1825134 B1 EP1825134 B1 EP 1825134B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
piston
chamber
fuel
opening direction
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.)
Expired - Fee Related
Application number
EP05815589A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1825134A1 (de
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 EP1825134A1 publication Critical patent/EP1825134A1/de
Application granted granted Critical
Publication of EP1825134B1 publication Critical patent/EP1825134B1/de
Expired - Fee Related 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
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • 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
    • 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
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • F02M2200/505—Adjusting spring tension by sliding spring seats
    • 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 is based on a fuel injection nozzle according to the preamble of patent claim 1.
  • 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.
  • Another example is from the EP-A-1 063 415 known.
  • the fuel injector for internal combustion engines according to the invention with the characterizing features of claim 1 has the advantage that the fuel injector is easy to control.
  • the separate structure of the control via separate control chambers of the two nozzle needles is particularly advantageous.
  • FIGURE shows the fuel injection nozzle according to the invention in a longitudinal section.
  • fuel injector 1 for internal combustion engines 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.
  • a high-pressure fuel line 7 is the Annulus 6 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.
  • a sealing cone 14 of the inner nozzle needle 5 in conjunction with the second sealing seat 13 prevents fuel from either with closed outer nozzle needle 4 from the existing between the two nozzle needles 4, 5 annular gap which is connected via a bore 15 in the outer nozzle needle 5 to the annular space 6, even with open outer nozzle needle 4 passes through second injection holes 16 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 17 , which is guided axially displaceably in a translator piston 18 open at the bottom.
  • the booster piston 18 forms the actuator of an inversely operated piezoelectric actuator 19.
  • the piezoelectric actuator 19 is energized, whereby the booster piston 18 against the action of a tension spring (for example, Bourdon tube) 20 is depressed downward.
  • the piston 17 is hydraulically coupled to the booster piston 18 via a booster chamber 21, which is filled with fuel under rail pressure, to enable a 1: 1 temperature compensation of the actuator 19.
  • the two nozzle needle 4, 5 are guided in each case displaceably on the piston 17.
  • the piston 17 has a downwardly open piston chamber, at the chamber wall, the two nozzle needles 4, 5 are guided.
  • the piston 17 engages with an annular first projection 22, the outer nozzle needle 4 and with an annular second projection 23, the inner nozzle needle 5 in each case Opening direction.
  • the outer nozzle needle 4 is in the opening direction of the first projection 22, while the inner nozzle needle 5 is spaced in the opening direction of the second projection 23 by h 1 .
  • the outer nozzle needles 4 delimited by a control surface acting in the closing direction 24 in the piston chamber , a first nozzle rear chamber 25 which is connected via a first throttle 26 with a first control chamber 27 .
  • the first control chamber 27 is bounded radially inwardly by the outer nozzle needles 4, radially outwardly by a sealing sleeve 28, in the opening direction by the piston 17 and in the closing direction by the nozzle body 2.
  • the sealing sleeve 28 which is supported by a housing side supported compression spring 29 in abutment against a shoulder of the nozzle body 2, the first control chamber 27 is throttled connected to the high-pressure fuel line 7.
  • the inner nozzle needle 5 delimits, with a control surface 30 acting in the closing direction , in the piston chamber 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 piston 17, radially outward by a sealing sleeve 34, in the opening direction by the booster piston 18 and in the closing direction by the nozzle body 2.
  • the second control chamber 33 is throttled connected to the high-pressure fuel line 7.
  • the piston 17 After a preliminary stroke h 1 , the piston 17 also takes over the second projection 23 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 16 in 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 23 and is opened up against the action of the closing spring 12.
  • the two nozzle needles 4, 5 are opened wide with only minimal opening stroke of the actuator 19.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP05815589A 2004-11-26 2005-10-31 Kraftstoffeinspritzdüse Expired - Fee Related EP1825134B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410057246 DE102004057246A1 (de) 2004-11-26 2004-11-26 Kraftstoffeinspritzdüse
PCT/EP2005/055656 WO2006056522A1 (de) 2004-11-26 2005-10-31 Kraftstoffeinspritzdüse

Publications (2)

Publication Number Publication Date
EP1825134A1 EP1825134A1 (de) 2007-08-29
EP1825134B1 true EP1825134B1 (de) 2009-12-16

Family

ID=35809575

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05815589A Expired - Fee Related EP1825134B1 (de) 2004-11-26 2005-10-31 Kraftstoffeinspritzdüse

Country Status (4)

Country Link
EP (1) EP1825134B1 (ja)
JP (1) JP2008522069A (ja)
DE (2) DE102004057246A1 (ja)
WO (1) WO2006056522A1 (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006017034B4 (de) * 2006-04-11 2008-01-24 Siemens Ag Piezo-Aktor, Verfahren zum Herstellen eines Piezo-Aktors und Einspritzsystem mit einem solchen
FR2906848B1 (fr) * 2006-10-09 2012-04-20 Renault Sas Dispositif de maintien d'une aiguille d'un injecteur de carburant, et injecteur de carburant associe

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
DE10348925A1 (de) * 2003-10-18 2005-05-12 Bosch Gmbh Robert Kraftstoffinjektor mit mehrteiligem, direktgesteuertem Einspritzventilglied
DE102004010183A1 (de) * 2004-03-02 2005-09-29 Siemens Ag Einspritzventil

Also Published As

Publication number Publication date
WO2006056522A1 (de) 2006-06-01
DE502005008728D1 (de) 2010-01-28
EP1825134A1 (de) 2007-08-29
JP2008522069A (ja) 2008-06-26
DE102004057246A1 (de) 2006-06-01

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