WO2001011220A1 - Injecteur a rampe commune - Google Patents

Injecteur a rampe commune Download PDF

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Publication number
WO2001011220A1
WO2001011220A1 PCT/DE2000/002532 DE0002532W WO0111220A1 WO 2001011220 A1 WO2001011220 A1 WO 2001011220A1 DE 0002532 W DE0002532 W DE 0002532W WO 0111220 A1 WO0111220 A1 WO 0111220A1
Authority
WO
WIPO (PCT)
Prior art keywords
chamber
nozzle
common rail
pressure
nozzle needle
Prior art date
Application number
PCT/DE2000/002532
Other languages
German (de)
English (en)
Inventor
Friedrich Boecking
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
Priority to JP2001515446A priority Critical patent/JP2003506621A/ja
Priority to DE50009786T priority patent/DE50009786D1/de
Priority to AT00962184T priority patent/ATE291169T1/de
Priority to US09/806,690 priority patent/US6626371B1/en
Priority to EP00962184A priority patent/EP1117922B1/fr
Priority to KR1020017003938A priority patent/KR20010075416A/ko
Publication of WO2001011220A1 publication Critical patent/WO2001011220A1/fr

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
    • 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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements

Definitions

  • the invention relates to a common rail injector for the injection of fuel in a common rail injection system of an internal combustion engine, which has an injector housing with a fuel inlet, which is connected to a central high-pressure fuel reservoir outside the injector housing and to a pressure chamber inside the injector housing. is injected from the high-pressure fuel depending on the position of a control valve, which ensures that in a longitudinal bore of the injector axially back and forth against the biasing force of a nozzle spring, which is accommodated in a nozzle spring chamber
  • Nozzle needle lifts off a seat when the pressure in the pressure chamber is greater than the pressure in a control chamber which is connected to the fuel inlet via an inlet throttle and to a relief chamber via a fuel outlet.
  • a high-pressure pump delivers the fuel to the central high-pressure accumulator, which is referred to as the common rail.
  • High pressure lines lead from the rail to the individual
  • Injectors that are assigned to the engine cylinders.
  • the injectors are made individually by the engine electronics driven.
  • the rail pressure is present in the pressure chamber and on the control valve. When the control valve opens, high-pressure fuel passes the nozzle needle, which is lifted against the biasing force of the nozzle spring, and into the combustion chamber.
  • the object of the invention is to provide a common rail injector of the type described at the outset, which is simple in construction and inexpensive to produce. In particular, good closing behavior should also be ensured at high nozzle needle speeds.
  • the task is in a common rail injector for fuel injection in a common rail injection system of an internal combustion engine, which has an injector housing with a fuel inlet, which is connected to a central high-pressure fuel reservoir outside the injector housing and to a pressure chamber inside the injector housing , from which high-pressure fuel is injected depending on the position of a control valve, which ensures that a nozzle needle that can be moved back and forth in a longitudinal bore of the injector axially against the pretensioning force of a nozzle spring, which is accommodated in a nozzle spring chamber, from a seat lifts off when the pressure in the pressure chamber is greater than the pressure in a control chamber, which is connected to the fuel inlet and via an inlet throttle a fuel outlet is connected to a relief chamber, in that the control chamber is integrated in the end of the nozzle needle remote from the combustion chamber.
  • This provides a compact common rail injector with stroke control that ensures that the nozzle needle closes quickly.
  • the control room can be made smaller than with conventional injectors, which leads to a quick response of the injector.
  • the configuration of the injector according to the invention enables rail pressures of up to 1,800 bar.
  • a special embodiment of the invention is characterized in that a substantially cylindrical recess is provided in the end of the nozzle needle remote from the combustion chamber, in which an outer circumferential section of a sleeve is axially displaceably displaceable under sealing action, the end surface of which is remote from the combustion chamber pressed against the injector housing by the pretensioning force of the nozzle spring and the interior of which is connected to the fuel outlet.
  • the sleeve provides the advantage that the control chamber and the nozzle spring chamber can be combined at the end of the nozzle needle remote from the combustion chamber, without the volume of the control chamber depending on the installation space of the nozzle spring. It is therefore possible to install a nozzle spring with high spring stiffness, which ensures that the nozzle needle closes well. This allows the injection duration and the injection timing to be precisely defined.
  • a further special embodiment of the invention is characterized in that a collar is formed on the end of the sleeve remote from the combustion chamber, which collar forms an abutment for the nozzle spring, which is biased against the end of the nozzle needle remote from the combustion chamber.
  • the nozzle spring has a dual function in the context of the present invention. First, by the biasing force of the nozzle spring Closing movement of the nozzle needle causes and secondly, the control chamber volume is determined by the biasing force of the nozzle spring in connection with the pressure in the control room.
  • a further special embodiment of the invention is characterized in that a biting edge is formed on the end face of the sleeve remote from the combustion chamber, which bears against the injector housing. It is thereby achieved that the control chamber is separated from the nozzle spring chamber surrounding the sleeve.
  • a further special embodiment of the invention is characterized in that the power supply is connected to the pressure chamber via the nozzle spring chamber and that the nozzle needle is guided between the nozzle spring chamber and the pressure chamber.
  • a further special embodiment of the invention is characterized in that at least one flattening is formed on the nozzle needle between the nozzle spring chamber and the pressure chamber, past which fuel can pass from the nozzle spring chamber into the pressure chamber.
  • Another special embodiment of the invention is characterized in that the inlet throttle is integrated in the nozzle needle or in the sleeve.
  • the inlet throttle serves to prevent pressure surges during operation. ⁇ tt L ⁇ ⁇ L ⁇ o in L ⁇
  • Fig. 2 shows a second embodiment of an injector according to the invention in longitudinal section through the injector housing.
  • Exemplary embodiment of the injector according to the invention has an injector housing, designated overall by 1.
  • the injector housing 1 comprises a nozzle body 2, which projects with its free end into the combustion chamber of the internal combustion engine to be supplied. With its distant combustion chamber
  • the end face of the nozzle body 2 is clamped axially against a holding body 3 by means of a clamping nut (not shown).
  • An axial guide bore 4 is recessed in the nozzle body 2.
  • a nozzle needle 5 with a tip 6 is guided axially displaceably in the guide bore 4.
  • a sealing surface is formed which interacts with a sealing seat which is formed on the nozzle body 2.
  • Seal seat is indicated with d s .
  • a spray hole 7 in the nozzle body 2 is closed.
  • high-pressure fuel is injected through the spray hole 7 into the combustion chamber of the internal combustion engine.
  • the stroke of the nozzle needle 5 is denoted by H.
  • the nozzle needle 5 has three
  • the diameter d x is slightly smaller than the diameter d 2 .
  • the difference in diameter between d 2 and d results in an annular space 8 in the vicinity of the end of the nozzle body 2 near the combustion chamber.
  • the annular space 8 is also referred to as the pressure space.
  • the diameter d 2 in the present example, the nozzle needle 5 corresponds to the diameter d 3 on the nozzle needle 5.
  • the diameter d 2 is also referred to as the guide diameter.
  • the diameter d 3 is also referred to as the control diameter.
  • the outer diameter d 2 of the nozzle needle 5 is equal to the inner diameter d 3 of the recess 14 in the end of the nozzle needle 5 remote from the combustion chamber.
  • the diameter d 3 can also be smaller than the diameter d 2 .
  • At least one flattening 9 is formed in the guide section of the nozzle needle 5 with the diameter d 2 .
  • the flat 9 creates a connection between a nozzle spring chamber 10 and the pressure chamber 8.
  • the nozzle spring chamber 10 is surrounded by the nozzle body 2 and the holding body 3.
  • a fuel inlet 11 is formed in the holding body 3 and opens into the nozzle spring chamber 10.
  • a nozzle spring 12 is arranged in the nozzle spring chamber 10.
  • the nozzle spring 12 is supported on the end face of the nozzle needle 5 remote from the combustion chamber.
  • In the center of the end face of the nozzle needle 5 remote from the combustion chamber there is a cylindrical recess 14 which surrounds a control chamber 15.
  • a sleeve 16 is guided on its outer lateral surface.
  • a collar 17 is formed which forms an abutment for the prestressed nozzle spring 12.
  • a biting edge 18 is formed on the end face of the sleeve 16 remote from the combustion chamber, which is in contact with the holding body 3.
  • the control chamber 15 is connected to the nozzle spring chamber 10 via an inlet throttle 19.
  • the nozzle spring chamber 10 via an inlet throttle 19.
  • the common rail injector shown in FIG. 1 works as follows: Via the fuel inlet 11, high-pressure fuel passes from the rail into the nozzle spring chamber 10. From there, the high-pressure fuel reaches the control chamber 15 and via the inlet throttle 19 on the other hand past the flat 9 into the pressure chamber 8.
  • the diameter ratios are selected in a known manner so that the nozzle needle 5 is in contact with the nozzle needle seat due to the high pressure in the control chamber 15 with its tip 6.
  • the control valve member 22 opens, the control chamber 15 is relieved and the nozzle needle tip 6 lifts off its seat.
  • High-pressure fuel is then injected through the spray hole 7 into the combustion chamber of the internal combustion engine until the control valve member 22 closes again. This then has the consequence that the pressure in the control chamber 15 increases and the nozzle needle 5 is pressed with its tip 6 against the associated nozzle needle seat due to the pretensioning force of the nozzle spring 12.
  • the second exemplary embodiment shown in FIG. 2 largely corresponds to the first exemplary embodiment shown in FIG. 1.
  • the same reference numerals are used to designate the same parts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Seats For Vehicles (AREA)
  • Platform Screen Doors And Railroad Systems (AREA)

Abstract

Injecteur à rampe commune pour l'injection de carburant dans un système d'injection à rampe commune d'un moteur à combustion interne. Ledit injecteur comporte un boîtier (1) doté d'une arrivée (11) de carburant se trouvant en communication avec un accumulateur central de haute pression situé à l'extérieur du boîtier (1) et avec une chambre à fluide sous pression (8), située à l'intérieur du boîtier (1), à partir de laquelle du carburant sous haute pression est injecté en fonction de la position d'une soupape de commande (22). Ladite soupape garantit qu'une aiguille (5) coulissant dans un trou longitudinal (4) de l'injecteur axialement contre la force de précontrainte d'un ressort (12) d'injecteur logé dans une chambre (10) pour ressort d'injecteur se soulève d'un siège lorsque la pression dans la chambre à fluide sous pression (8) est plus élevée que la pression dans une chambre de commande (15) qui se trouve en communication avec l'arrivée (11) de carburant par l'intermédiaire d'un étranglement d'amenée (19; 25, 26) et avec une chambre de décompression par l'intermédiaire d'une conduite d'évacuation (20) de carburant. Selon la présente invention, la chambre de commande (15) est intégrée dans l'extrémité de l'aiguille (5) située à distance de la chambre de combustion, ce qui permet d'obtenir un injecteur à rampe commune de conception simple et de fabrication peu onéreuse.
PCT/DE2000/002532 1997-10-09 2000-08-01 Injecteur a rampe commune WO2001011220A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP2001515446A JP2003506621A (ja) 1999-08-04 2000-08-01 コモンレール・インジェクタ
DE50009786T DE50009786D1 (en) 1999-08-04 2000-08-01 Common-rail-injektor
AT00962184T ATE291169T1 (de) 1999-08-04 2000-08-01 Common-rail-injektor
US09/806,690 US6626371B1 (en) 1997-10-09 2000-08-01 Common rail injector
EP00962184A EP1117922B1 (fr) 1999-08-04 2000-08-01 Injecteur a rampe commune
KR1020017003938A KR20010075416A (ko) 1999-08-04 2000-08-01 공통 레일 분사기

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19936669A DE19936669A1 (de) 1999-08-04 1999-08-04 Common-Rail-Injektor
DE19936669.1 1999-08-04

Publications (1)

Publication Number Publication Date
WO2001011220A1 true WO2001011220A1 (fr) 2001-02-15

Family

ID=7917135

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2000/002532 WO2001011220A1 (fr) 1997-10-09 2000-08-01 Injecteur a rampe commune

Country Status (7)

Country Link
EP (1) EP1117922B1 (fr)
JP (1) JP2003506621A (fr)
KR (1) KR20010075416A (fr)
AT (1) ATE291169T1 (fr)
CZ (1) CZ20011138A3 (fr)
DE (2) DE19936669A1 (fr)
WO (1) WO2001011220A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002001062A1 (fr) * 2000-06-29 2002-01-03 Robert Bosch Gmbh Injecteur resistant aux pressions elevees, servant a l'injection de carburant dans une structure compacte
US7429007B2 (en) * 2000-08-02 2008-09-30 Robert Bosch Gmbh Fuel injection and method for adjustment thereof

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10036868B4 (de) * 2000-07-28 2004-07-29 Robert Bosch Gmbh Injektor für ein einen Hochdrucksammelraum umfassendes Einspritzsystem
DE10100390A1 (de) * 2001-01-05 2002-07-25 Bosch Gmbh Robert Einspritzventil
DE10111783B4 (de) * 2001-03-12 2005-10-20 Bosch Gmbh Robert Einspritzdüse
DE10152268A1 (de) * 2001-10-20 2003-04-30 Bosch Gmbh Robert Einspritzventil
DE10155187B4 (de) * 2001-11-12 2007-08-16 L'orange Gmbh Einspritzinjektor für Brennkraftmaschinen
DE10250720A1 (de) * 2002-10-31 2004-05-13 Robert Bosch Gmbh Einspritzventil
DE102004018931A1 (de) * 2004-04-20 2005-11-17 Robert Bosch Gmbh Common-Rail-Injektor
JP4868524B2 (ja) * 2007-04-09 2012-02-01 ボッシュ株式会社 燃料噴射弁
DE102013225107A1 (de) 2013-12-06 2015-06-11 Robert Bosch Gmbh Kraftstoffinjektor, insbesondere Common-Rail-Injektor für selbstzündende Brennkraftmaschinen
JP7322820B2 (ja) * 2020-06-10 2023-08-08 株式会社デンソー 弁装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19724637A1 (de) 1997-06-11 1998-12-17 Bosch Gmbh Robert Einspritzventil
DE19744518A1 (de) * 1997-10-09 1999-04-15 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19954023A1 (de) * 1998-11-30 2000-05-31 Denso Corp Hochdruckkraftstoffeinspritzvorrichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB862382A (en) * 1959-04-01 1961-03-08 Caterpillar Tractor Co Sliding type fuel injection valve
DE3535124A1 (de) * 1985-10-02 1987-04-02 Bosch Gmbh Robert Elektromagnetisch betaetigbares kraftstoffeinspritzventil
US4987887A (en) * 1990-03-28 1991-01-29 Stanadyne Automotive Corp. Fuel injector method and apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19724637A1 (de) 1997-06-11 1998-12-17 Bosch Gmbh Robert Einspritzventil
DE19744518A1 (de) * 1997-10-09 1999-04-15 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19954023A1 (de) * 1998-11-30 2000-05-31 Denso Corp Hochdruckkraftstoffeinspritzvorrichtung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002001062A1 (fr) * 2000-06-29 2002-01-03 Robert Bosch Gmbh Injecteur resistant aux pressions elevees, servant a l'injection de carburant dans une structure compacte
US7429007B2 (en) * 2000-08-02 2008-09-30 Robert Bosch Gmbh Fuel injection and method for adjustment thereof
US7828233B2 (en) 2000-08-02 2010-11-09 Robert Bosch Gmbh Fuel injector and method for its adjustment

Also Published As

Publication number Publication date
DE50009786D1 (en) 2005-04-21
EP1117922B1 (fr) 2005-03-16
CZ20011138A3 (cs) 2002-01-16
KR20010075416A (ko) 2001-08-09
DE19936669A1 (de) 2001-02-22
ATE291169T1 (de) 2005-04-15
EP1117922A1 (fr) 2001-07-25
JP2003506621A (ja) 2003-02-18

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