EP1185786B1 - Injektor für unter hochdruck erfolgender kraftstoffeinspritzung - Google Patents

Injektor für unter hochdruck erfolgender kraftstoffeinspritzung Download PDF

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Publication number
EP1185786B1
EP1185786B1 EP00988600A EP00988600A EP1185786B1 EP 1185786 B1 EP1185786 B1 EP 1185786B1 EP 00988600 A EP00988600 A EP 00988600A EP 00988600 A EP00988600 A EP 00988600A EP 1185786 B1 EP1185786 B1 EP 1185786B1
Authority
EP
European Patent Office
Prior art keywords
injector
sleeve
pressure
nozzle
nozzle 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.)
Expired - Lifetime
Application number
EP00988600A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1185786A2 (de
Inventor
Jaroslaw Hlousek
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 EP1185786A2 publication Critical patent/EP1185786A2/de
Application granted granted Critical
Publication of EP1185786B1 publication Critical patent/EP1185786B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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

Definitions

  • Injectors for fuel under extremely high pressure have a Injection controlling slide on, as well as in the combustion chamber of a Internal combustion engine protruding nozzle needle.
  • Injection controlling slide on as well as in the combustion chamber of a Internal combustion engine protruding nozzle needle.
  • solenoid valves which are shortest Activation times can be realized.
  • the prior art injectors for internal combustion engines have become known that can be equipped with multi-way valves.
  • solenoid valves are used to control the injectors, with which can achieve very short switching times.
  • the injectors in certain injector areas are subjected to pressures of up to 1600 bar, to inject in extremely high-compression diesel engines Achieve arise on the surfaces where moving parts Relative movements occur and on the components, the maximum pressure chambers of those with relatively lower pressures, leakage losses.
  • the leakage losses occur from injection process to injection process and can, for example, the needle diameter and on Adjust spool diameter.
  • Leakage losses of fuel in the Combustion chamber of the cylinder of an internal combustion engine can for so-called “Afterdieseln” after switching off the internal combustion engine lead, if For example, at the opening into the combustion chamber nozzle needle leakage losses occur. At the opposite end of the injector, the leakage losses can on the other hand, just as well, for example on serving as a 2/2-way valve Magnetic valve.
  • a fuel injector wherein the movement of a valve needle by a limiting element with a sleeve-shaped projecting into the control room Approach is completed is described in EP-A 1 338 788 published later.
  • About a second Control room affects the fuel with system pressure on the limiting element. The fuel pressure is controlled by a valve.
  • the subject of the later published WO-A 01/29407 is a control valve for injectors of injection systems for internal combustion engines.
  • an actuator closes, which is made by an actuator via a hydraulic translation, an opening a firmly pressed into the housing sleeve.
  • FIG. 1 shows a longitudinal section through an injector body which on the inlet side with a common high-pressure collecting chamber (common rail) is connected and also via a non-pressure drain line with a storage tank communicates.
  • a common high-pressure collecting chamber common rail
  • the injector body 1 is extending from one in its axial direction Traversed bore, in which a sleeve 2 is inserted.
  • the sleeve 2 in turn is provided with an axial bore 17 and is in two diameter ranges with subdivided relative to the injector body different game.
  • a first Diameter range 4 which is located in the injector body 1 by a start-up throttle 16 in the upper area to a bow seat stop 11 in the region of the nozzle. 5 extends, the sleeve 2 in the injector 1 has a game of> 0.01 mm, wherein the Diameter of the bore 17 in the axially extending sleeve in the area of 1.5mm.
  • the sleeve 2 is stored almost free of play and that with a game of ⁇ 0.01 mm, which is very demanding on the Concentricity and the quality of the machining of the sleeve component 2 provides.
  • the sleeve 2 receiving the injector body 1 has at its in the combustion chamber an internal combustion engine projecting area a nozzle 5, which in turn encloses a nozzle needle 8.
  • the nozzle 5 can by means of a dashed line aligned centering pin 25 are aligned relative to the injector body 1, besides using a centering pin 25 for alignment as well other centering bodies can be used.
  • In the upper area of the Injector body 1 is designed as a solenoid valve 6 2/2-way valve executed.
  • the solenoid valve 6 acts on a ball valve 15, which arranged above the recessed into the injector 1 sleeve 2, whose Throttle opening 16 closes.
  • the solenoid valve 6 is connected via a control unit 19 controllable, which is indicated only schematically in Figure 1 with the solenoid valve. 6 is connected and this controls.
  • the application of the injector body 1 of the injector for the injection of Fuel at maximum pressures of more than 1600 bar takes place via a Inlet line 20.
  • About the high-pressure inlet 20 starting from the High-pressure accumulator 22 (common rail) are the high-pressure accumulator 22nd via the inlet mouth 20.1 and the adjoining bore 20.2 in Injector body 1 with each other in conjunction.
  • From a storage tank 24 is Fuel by means of a high-pressure pump 23 in the high-pressure accumulation chamber 22nd from which the individual branch off to the various injectors High-pressure feeds 20 are included.
  • the high-pressure accumulator 22 can via the high-pressure accumulator 22 (common rail)
  • four injectors on an internal combustion engine with under extreme supplied with high pressure fuel It's natural, of course readily possible at the high-pressure reservoir 22 and branches to six or eight injectors for 6- or 8-cylinder internal combustion engines provided.
  • the Solenoid valve 6 which at the ball seat 15, the outlet throttle 16 of the sleeve. 2 closes or releases again when energized.
  • a well-defined Solenoid valve control amount of fuel through this opening 16 of the axially extending sleeve 2 in the through the valve closing spring 7 above the Ball seat 15 filled free space.
  • the solenoid valve control quantity passes through the bore 18 via the non-pressurized drain, designed as a separate Bore in the injector body 1 back into the storage tank 24; the Solenoid valve control amount is therefore no loss in this sense, since they again in the fuel delivery taking over part of the injection system can occur.
  • Nozzle needle control chamber 12 is formed, which in Figure 2 on an enlarged scale is reproduced.
  • the nozzle needle control chamber 12 is on the one hand by the control room side End face of the sleeve 2 limited, on the other hand by the nozzle opening remote end of the nozzle needle 8.
  • In the nozzle needle control chamber 12 opens the Branch 13 of the high pressure line 20.2, starting the injector body 1 from the mouth 20.1 pervades.
  • the high pressure bore 20.2 extends the nozzle 5 tapered by the injector body 1, for example, by a Centering pin 25 can be aligned with the nozzle 5.
  • Nozzle needle diameter 9 is the nozzle needle diameter 14 executed enlarged at the end of the nozzle needle 8.
  • the 2/2-way valve - preferably designed as a fast switching solenoid valve is de-energized and the system pressure, i. of the High pressure of the high-pressure accumulator 22 is not present at the injector body 1, presses the closing spring 7 above the ball seat 15 in the injector body. 1 movably mounted sleeve 2 in the direction of the nozzle needle seat 9. This is the nozzle needle 8 is pressed onto the nozzle needle seat 9, so that the opening for The combustion chamber remains closed and it does not lead to the unwanted escape of Fuel, i. can come to the "diesel".
  • the injector with the am High-pressure accumulator 22 pending high pressure of more than 1600 bar acted upon enters the fuel through the inlet port 20.1 in the Inlet bore 20.2 of the injector body 1 a.
  • the fuel is then on the one hand on the nozzle needle seat 9, on the other hand acting as an inlet throttle 13 Opening also at the nozzle needle control room 12.
  • the solenoid valve 6 By controlling the solenoid valve 6 via the control unit 19 of the Ball seat 15 which acts as a drain throttle 16 opening at the top of in the injector body 1 inserted sleeve 2 free.
  • the opening 16 is larger dimensioned as the branch 13 of the high-pressure bore 20.2, wherein the Branch 13 opens into the nozzle needle control chamber 12 and acts as a throttle.
  • the pressure in the nozzle needle control chamber 12 and the nozzle needle 8 decreases moves with its end portion on the front side 10 of the sleeve 2 added.
  • the nozzle needle 8 releases the nozzle needle seat 9 - the injection into the Combustion chamber of the internal combustion engine begins.
  • the injection end is thereby brought about that via the control unit 19, the energization of the solenoid valve. 6 will be annulled.
  • the ball seat 15 closes the outlet throttle 16, the Solenoid valve control amount is via the pressureless drain 18 via the Retaining spring 7 receiving free space fed back into the storage tank 24.
  • the bore 17 in the sleeve 2 which extends through the injector body 1 is designed in a diameter ⁇ 1.5 mm, the high Flow velocity in the bore 17 in a high pressure wave converted, which acts as a pressure increase in the nozzle needle control chamber 12.
  • higher pressure acts on the end portion of the Nozzle needle 8
  • the by the "hammer pipe effect" in the nozzle needle control chamber 12 suddenly increased pressure is greater than the am Nozzle needle seat 9 anyway pending continuous high pressure of High pressure header 20.1, i.e. as the pressure in the common rail. This provides in the injector 1, the closing of the nozzle opening in the combustion chamber.

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)
EP00988600A 1999-11-24 2000-11-10 Injektor für unter hochdruck erfolgender kraftstoffeinspritzung Expired - Lifetime EP1185786B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19956522A DE19956522A1 (de) 1999-11-24 1999-11-24 Injektor für unter Hochdruck erfolgender Kraftstoffeinspritzung
DE19956522 1999-11-24
PCT/DE2000/004005 WO2001038721A2 (de) 1999-11-24 2000-11-10 Injektor für unter hochdruck erfolgender kraftstoffeinspritzung

Publications (2)

Publication Number Publication Date
EP1185786A2 EP1185786A2 (de) 2002-03-13
EP1185786B1 true EP1185786B1 (de) 2005-09-14

Family

ID=7930166

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00988600A Expired - Lifetime EP1185786B1 (de) 1999-11-24 2000-11-10 Injektor für unter hochdruck erfolgender kraftstoffeinspritzung

Country Status (7)

Country Link
US (1) US6698673B1 (ko)
EP (1) EP1185786B1 (ko)
JP (1) JP2003515048A (ko)
KR (1) KR100714852B1 (ko)
DE (2) DE19956522A1 (ko)
RU (1) RU2263225C2 (ko)
WO (1) WO2001038721A2 (ko)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100528566B1 (ko) * 2002-07-04 2005-11-15 주성엔지니어링(주) 증착 공정용 가스 분사시스템
DE102006007574A1 (de) * 2006-02-18 2007-08-30 Man Diesel Se Steuerventil eines Einspritzinjektors für Schwerölbetrieb
US20080296412A1 (en) * 2007-06-01 2008-12-04 Caterpillar Inc. Fuel injector having a flow passage insert
DE102008002522A1 (de) * 2008-06-19 2009-12-24 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102012110240A1 (de) * 2012-10-26 2014-04-30 L'orange Gmbh Kraftstoff-Einspritz-Injektor für Brennkraftmaschinen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001029407A1 (de) * 1999-10-19 2001-04-26 Robert Bosch Gmbh Doppeltschaltendes steuerventil mit kugelförmigem stellglied
EP1338788A1 (en) * 1999-04-01 2003-08-27 Delphi Technologies, Inc. Fuel injector

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2812519C2 (de) * 1978-03-22 1984-05-30 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8500 Nürnberg Kraftstoffeinspritzdüse mit Nadelhubsteuerung für direkt einspritzende Brennkraftmaschinen
US4628881A (en) * 1982-09-16 1986-12-16 Bkm, Inc. Pressure-controlled fuel injection for internal combustion engines
US4529165A (en) * 1984-08-14 1985-07-16 United Technologies Diesel Systems, Inc. Solenoid valve
CH668621A5 (de) * 1986-01-22 1989-01-13 Dereco Dieselmotoren Forschung Kraftstoffeinspritzanlage fuer eine brennkraftmaschine.
DE3931456A1 (de) * 1989-09-21 1991-04-04 Bosch Gmbh Robert Einspritzeinrichtung fuer dieselmotoren
DE4142998C1 (ko) * 1991-12-24 1993-07-22 Robert Bosch Gmbh, 7000 Stuttgart, De
US5299346A (en) * 1993-02-24 1994-04-05 Siemens Automotive L.P. Fuel injector upper needle guide burnishing and alignment tool
JP3235286B2 (ja) * 1993-08-19 2001-12-04 株式会社デンソー 内燃機関用燃料噴射装置
CH689282A5 (de) * 1994-03-29 1999-01-29 Christian Dipl-Ing Eth Mathis Einspritzventil fuer eine insbesondere als Dieselmotor vorgesehene Brennkraftmaschine.
JPH08296521A (ja) * 1995-02-28 1996-11-12 Isuzu Motors Ltd インジェクタの針弁制御装置
US5673853A (en) * 1995-09-13 1997-10-07 Cummins Engine Company, Inc. Electromagnetic fuel injector control valve
JP3743533B2 (ja) * 1995-12-21 2006-02-08 株式会社デンソー 燃料噴射装置
JP3327787B2 (ja) * 1996-09-25 2002-09-24 三菱重工業株式会社 二流体噴射弁
JP3129239B2 (ja) * 1997-06-09 2001-01-29 トヨタ自動車株式会社 燃料噴射弁
US6109542A (en) 1998-09-21 2000-08-29 Cummins Engine Company, Inc. Servo-controlled fuel injector with leakage limiting device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1338788A1 (en) * 1999-04-01 2003-08-27 Delphi Technologies, Inc. Fuel injector
WO2001029407A1 (de) * 1999-10-19 2001-04-26 Robert Bosch Gmbh Doppeltschaltendes steuerventil mit kugelförmigem stellglied

Also Published As

Publication number Publication date
DE50011172D1 (de) 2005-10-20
DE19956522A1 (de) 2001-06-07
RU2263225C2 (ru) 2005-10-27
WO2001038721A2 (de) 2001-05-31
WO2001038721A3 (de) 2001-12-27
KR100714852B1 (ko) 2007-05-08
JP2003515048A (ja) 2003-04-22
EP1185786A2 (de) 2002-03-13
KR20010101605A (ko) 2001-11-14
US6698673B1 (en) 2004-03-02

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