EP1979605B1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP1979605B1
EP1979605B1 EP06830145A EP06830145A EP1979605B1 EP 1979605 B1 EP1979605 B1 EP 1979605B1 EP 06830145 A EP06830145 A EP 06830145A EP 06830145 A EP06830145 A EP 06830145A EP 1979605 B1 EP1979605 B1 EP 1979605B1
Authority
EP
European Patent Office
Prior art keywords
valve
leakage oil
return line
oil return
fuel injector
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
EP06830145A
Other languages
German (de)
English (en)
Other versions
EP1979605A1 (fr
Inventor
Friedmar Dresig
Maik Paehrisch
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 EP1979605A1 publication Critical patent/EP1979605A1/fr
Application granted granted Critical
Publication of EP1979605B1 publication Critical patent/EP1979605B1/fr
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
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from injectors
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/304—Fuel-injection apparatus having mechanical parts, the movement of which is damped using hydraulic 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • the invention relates to a fuel injector according to the preamble of claim 1.
  • Diesel common rail systems including fuel injectors or their components are subject to high pressure loads during operation.
  • the amount of pressure corresponds approximately to the injection pressures to be achieved in the engine.
  • these pressures should be increased as much as possible.
  • previous designs have reached their limits in their geometry design.
  • leakage is discharged from the holding body via a leakage oil return line which extends in the holding body and opens into a separate low-pressure side space of the holding body, as recordable in DE 100 52 604 A disclosed.
  • a fuel injector which has a channel extending in the valve piece, which connects the control chamber with the low-pressure region.
  • DE10312913A1 discloses a fuel injector for internal combustion engines, with a nozzle body in an axially displaceable guided nozzle needle, which releases at least one injection hole for fuel injection or closes, with a axially displaceably guided in a holding body valve piston which controls the opening and closing movement of the nozzle needle, with a valve piece in which an auxiliary piston delimits a control space connected to a high pressure side, which is connected via a control valve to a low pressure side, and with a leakage oil return line which discharges leak oil from the area between the auxiliary piston and the valve piston, wherein the leakage oil return line at least partially in the valve piece runs.
  • the auxiliary piston is mechanically coupled to the valve piston to actuate the latter.
  • the fuel injector for internal combustion engines according to the invention with the characterizing features of claim 1 is used to increase pressure, cost reduction and quality improvement. It can be eliminated by the invention strength-reducing manufacturing process on the holding body.
  • the burr formation due to the current construction in the region of the intersection of the leak oil pocket / leak oil groove is eliminated. This eliminates the operation of deburring, and eliminates several operations. Wall thickness problems are solved so that e.g. a longer and more robust valve tightening screw (more carrying aisles) can be used to tighten the holding body, which in turn allows for pressure increases.
  • the construction of the invention simplifies the structure of the fuel injector and reduces the number of processing steps.
  • an increase in the strength of the holding body and a pressure increase of the fuel injector are possible.
  • the in Fig. 1 shown fuel injector 1 is arranged in a pressurized high pressure injection line 2 of the fuel and protrudes into the combustion chamber of the engine to be supplied.
  • a piston-shaped valve member (nozzle needle) 5 is slidably mounted with a conical valve sealing surface 6 , which is pressed by a closing spring 7 against a conical valve seat 8 of the nozzle body 4 and closes the injection holes 9 provided there.
  • the injection line 2 opens into the nozzle body 4 in an annular pressure chamber 10, from which an annular gap extending between the guide bore 3 and the nozzle needle 5 leads to the valve seat surface 8.
  • the nozzle needle 5 has in the region of the pressure chamber 10 designed as a pressure shoulder control surface 11 to which the supplied via the injection line 2 fuel attacks in the opening direction of the nozzle needle 5.
  • valve piston 12 which is axially displaceably guided in a guide bore 13 of a holding body 14 and with its one end on the valve sealing surface 6 facing away from the end face of the nozzle needle 5 acts axially.
  • Fig. 2 shows limited at the other end of the valve piston 12 with a force acting in the closing direction control surface 15 in a valve member 16 a control chamber 17 which is connected via a Z-throttle 18 to the injection line 2.
  • A-throttle 19 From the control chamber 17 is an A-throttle 19 , which is connected via a formed, for example, as a 2/2-way solenoid valve control valve 20 (valve closure member 21 ) with a low-pressure-side Ab Kunststoffraum 22 .
  • a leakage oil return line 23 in the form of an axial through hole, which goes off from the low-pressure loaded guide bore 13 of the holding body 14 and extends into the discharge chamber 22.
  • the holding body 14 can be made with a greater wall thickness, so that, for example, a longer and more robust valve clamping screw 24 (more carrying gears) can be used for clamping the valve member 16, which in turn allows pressure increases.
  • the control surfaces 11, 14 and the closing spring 7 are designed so that when the control valve 20 is closed, i. at the same pressure in the pressure chamber 10 and in the control chamber 17, the nozzle needle 5, the injection holes 9 closes.
  • the Z-throttle 18 is smaller than the A-throttle 19, so that by opening the control valve 20 of the pressure prevailing in the control chamber 17 pressure is reduced via the Abêtraum 22 and the pressure prevailing in the pressure chamber 10 pressure is sufficient, the nozzle needle 5 against the effect of Aufzu juryn closing spring 7.

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 (5)

  1. Injecteur de carburant (1) pour moteurs à combustion interne, avec une aiguille d'injection (5) guidée de manière déplaçable axialement dans un corps de buse (4), qui ouvre ou ferme au moins un trou d'injection (9) pour une injection de carburant, avec un piston de soupape (12) guidé de manière déplaçable axialement dans un corps de retenue (14), qui commande le mouvement d'ouverture et de fermeture de l'aiguille d'injection (5), avec un élément de soupape (16) dans lequel le piston de soupape (12) limite un espace de commande (17) raccordé à un côté haute pression (2), qui est raccordé par le biais d'une soupape de commande (20) à un côté basse pression (22), et avec une conduite de retour d'huile de fuite (23 ; 23') qui évacue l'huile de fuite hors de la région du corps de retenue (14),
    caractérisé en ce que
    la conduite de retour d'huile de fuite (23 ; 23') s'étend au moins en partie dans l'élément de soupape (16).
  2. Injecteur de carburant selon la revendication 1, caractérisé en ce que la conduite de retour d'huile de fuite (23) débouche dans un espace de commande (22), côté basse pression, de la soupape de commande (20).
  3. Injecteur de carburant selon la revendication 1 ou 2, caractérisé en ce que la conduite de retour d'huile de fuite (23) est formée par un alésage de passage unique.
  4. Injecteur de carburant selon l'une quelconque des revendications précédentes, caractérisé en ce que la conduite de retour d'huile de fuite (23) s'étend exclusivement dans l'élément de soupape (16).
  5. Injecteur de carburant selon la revendication 1 ou 2, caractérisé en ce que la conduite de retour d'huile de fuite (23') débouche latéralement dans une surface extérieure (25) de l'élément de soupape (16) et est guidée de celle-ci vers le côté basse pression.
EP06830145A 2006-01-23 2006-11-27 Injecteur de carburant Expired - Fee Related EP1979605B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006003040A DE102006003040A1 (de) 2006-01-23 2006-01-23 Kraftstoffinjektor
PCT/EP2006/068952 WO2007082598A1 (fr) 2006-01-23 2006-11-27 Injecteur de carburant

Publications (2)

Publication Number Publication Date
EP1979605A1 EP1979605A1 (fr) 2008-10-15
EP1979605B1 true EP1979605B1 (fr) 2009-06-24

Family

ID=37890906

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06830145A Expired - Fee Related EP1979605B1 (fr) 2006-01-23 2006-11-27 Injecteur de carburant

Country Status (6)

Country Link
US (1) US20080283627A1 (fr)
EP (1) EP1979605B1 (fr)
CN (1) CN101360909B (fr)
AT (1) ATE434721T1 (fr)
DE (2) DE102006003040A1 (fr)
WO (1) WO2007082598A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009103080A (ja) * 2007-10-24 2009-05-14 Denso Corp 燃料噴射弁
DE102014200581A1 (de) * 2014-01-15 2015-07-16 Robert Bosch Gmbh Brennstoffeinspritzanlage mit einer Brennstoff führenden Komponente, einem Brennstoffeinspritzventil und einer Verbindungseinrichtung
CN107035586B (zh) * 2017-01-18 2023-01-03 哈尔滨工程大学 一种带液力反馈的微动态回油谐振式电控喷油器
CN108412653B (zh) * 2018-03-30 2023-11-03 重油高科电控燃油喷射系统(重庆)有限公司 一种共轨喷油器

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH495504A (de) * 1968-08-28 1970-08-31 Sopromi Soc Proc Modern Inject Brennstoff-Einspritzventil mit elektromagnetischer Betätigung
US6012644A (en) * 1997-04-15 2000-01-11 Sturman Industries, Inc. Fuel injector and method using two, two-way valve control valves
US5826802A (en) * 1995-11-17 1998-10-27 Caterpillar Inc. Damped check valve for fluid injector system
DE19641824A1 (de) * 1996-10-10 1998-04-16 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19947772A1 (de) * 1999-10-05 2001-04-19 Hermann Golle Einspritzventil, insb. für Common-Rail-Einspritzsysteme
DE10052604A1 (de) * 2000-10-24 2002-05-02 Bosch Gmbh Robert Magnetventil zur Steuerung eines Einspritzventils einer Brennkraftmaschine
ITTO20010814A1 (it) * 2001-08-14 2003-02-14 Fiat Ricerche Iniettore di combustibile per un motore endotermico e relativo metododi fabbricazione.
DE10312913A1 (de) * 2003-03-22 2004-10-07 Robert Bosch Gmbh Hubgesteuertes Kraftstoffeinspritzventil

Also Published As

Publication number Publication date
ATE434721T1 (de) 2009-07-15
WO2007082598A1 (fr) 2007-07-26
US20080283627A1 (en) 2008-11-20
EP1979605A1 (fr) 2008-10-15
CN101360909A (zh) 2009-02-04
DE102006003040A1 (de) 2007-07-26
DE502006004092D1 (de) 2009-08-06
CN101360909B (zh) 2011-02-09

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