EP1117921B1 - Injecteur de carburant pour un système carburant à rampe commune - Google Patents

Injecteur de carburant pour un système carburant à rampe commune Download PDF

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Publication number
EP1117921B1
EP1117921B1 EP00962182A EP00962182A EP1117921B1 EP 1117921 B1 EP1117921 B1 EP 1117921B1 EP 00962182 A EP00962182 A EP 00962182A EP 00962182 A EP00962182 A EP 00962182A EP 1117921 B1 EP1117921 B1 EP 1117921B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
nozzle needle
space
pressure
fuel
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
EP00962182A
Other languages
German (de)
English (en)
Other versions
EP1117921A1 (fr
Inventor
Dieter Kienzler
Patrick Mattes
Wolfgang Stoecklein
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 EP1117921A1 publication Critical patent/EP1117921A1/fr
Application granted granted Critical
Publication of EP1117921B1 publication Critical patent/EP1117921B1/fr
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
    • 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
    • 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 common rail injector for Injection of fuel in a common rail injection system an internal combustion engine, the one Injector housing having a fuel inlet, the with a central high-pressure fuel storage outside the injector housing and with a pressure chamber within the Injector housing communicates, from the high pressure applied fuel depending on the position a control valve is injected, which ensures that in a longitudinal bore of an injector axially against the biasing force of a nozzle spring in a Nozzle spring space is included, reciprocable Nozzle needle lifts off a seat when the pressure in the Pressure chamber is greater than the pressure in a control room, the connected via an inlet throttle with the fuel inlet is.
  • common-rail injection systems promotes a High pressure pump the fuel in the central High-pressure accumulator, which is referred to as common rail.
  • high-pressure accumulator From the high-pressure accumulator lead high-pressure lines to the individual injectors assigned to the engine cylinders are.
  • the injectors are individually from the engine electronics driven.
  • the rail pressure is in the pressure chamber and on to the control valve. When the control valve opens, it raises Nozzle needle against the biasing force of the nozzle spring of hers Seat off, and high-pressure fuel is injected into the combustion chamber.
  • the object of the invention is a common rail injector to be provided using conventional Injectors significantly higher nozzle needle speeds allowed.
  • the injector according to the invention be simple and inexpensive to produce.
  • the task is with a common rail injector for Injection of fuel in a common rail injection system an internal combustion engine, the one Injector housing having a fuel inlet, the with a central high-pressure fuel storage outside the injector housing and with a pressure chamber within the Injector housing communicates, from the high pressure applied fuel depending on the position a control valve is injected, which ensures that in a longitudinal bore of the injector axially against the biasing force of a nozzle spring in a Nozzle spring space is included, reciprocable Nozzle needle lifts off a seat when the pressure in the Pressure chamber is greater than the pressure in a control room, the connected via an inlet throttle with the fuel inlet is solved by the fact that the control room of a cylindrical space is formed in which a on the Brennraumfernen trained end of the nozzle needle Control pin is slidable under sealing action, and that the nozzle spring chamber in the region of the combustion chamber remote end of Nozzle needle is arranged outside the control room.
  • the nozzle spring in the control room accommodate. But the space of the Nozzle spring unfavorable to the function of the injector impact. To get acceptable closing speeds too reach, is a high spring stiffness necessary, which in turn requires a large amount of space. This increases the control chamber volume, and that Behavior of the injector deteriorates. Of this will be in particular the determination of the injection timing and the Injection length impaired. In addition, enlarged get the required tax amount, so the Overall efficiency decreases and the risk of excessive Fuel heating exists.
  • the invention provides the Advantage that the control chamber and the nozzle spring chamber on Brennraumfernen end of the nozzle needle are combined can, without the volume of the control room of the Space of the nozzle spring depends.
  • a particular embodiment of the invention is characterized characterized in that the fuel feed into the Nozzle spring chamber opens and that at the nozzle needle between the nozzle spring chamber and the pressure chamber at least one Flattening is formed.
  • the flattening becomes one Flow connection between the nozzle spring chamber and the Created pressure chamber through which the injected Fuel from the fuel inlet into the pressure chamber arrives.
  • the existing with conventional injectors Bore to the pressure chamber can be omitted.
  • Another particular embodiment of the invention is characterized in that the control room in one Valve piece is formed, which has a central Drain hole with an outlet throttle and a valve seat having. Through the central drain hole is a Connection between the control room and one Relief room created.
  • the valve seat acts with a Control valve member of a 2/2-way valve together, the Injection course of the injector according to the invention controls.
  • the inlet throttle in the Valve piece or integrated into the nozzle needle can be in the form of a bore or a groove exhibit. For manufacturing and / or cost reasons is the one or other embodiment preferable.
  • Another particular embodiment of the invention is characterized in that the nozzle needle through the Control pin is guided. Due to that inventive principle occurs in the unactuated Condition no internal leakage on the guide. Leading to lower specific consumption values.
  • Another particular embodiment of the invention is characterized in that the nozzle needle at its close to the combustion chamber.
  • the additional guide the nozzle needle increases the reliability and the Life of the injector.
  • Another particular embodiment of the invention is characterized in that at the nozzle needle a step is formed, which is a stop for a spring plate forms.
  • the spring plate forms an abutment for the Nozzle spring and at the same time the stroke stop for the Nozzle needle.
  • the first shown in Figure 1 in longitudinal section Embodiment of the injector according to the invention has a total of 1 designated injector on.
  • the Injector housing 1 comprises a nozzle body 2, which with its lower free end into the combustion chamber of the supplying internal combustion engine protrudes. With his upper, Brennraumfernen end face of the nozzle body 2 by means a clamping nut 5 axially against a holding body. 4 braced. On the holding body 4 is an inner circumferential Girth 26 formed. Supported on the peripheral web 26 a valve piece 3 with a collar.
  • nozzle body 2 In the nozzle body 2 is an axial longitudinal bore. 6 spared. In the longitudinal bore 6 is a nozzle needle. 8 received axially displaceable. At the top 9 of the Nozzle needle 8 is a sealing surface formed with a sealing seat which cooperates with the nozzle body 2 is trained. When the tip 9 of the nozzle needle 8 with its sealing surface in contact with the sealing seat, an injection hole 10 is closed in the nozzle body 2. When the nozzle needle tip 9 lifts off its seat, is with High-pressure fuel through the injection hole 10th in the combustion chamber of the internal combustion engine to be supplied injected.
  • the nozzle needle 8 has three regions with different diameters d 1 , d 2 and d 3 .
  • the diameter d 2 is largest, and the diameter d 1 and d 3 are the same size in the present embodiment, but may also have different diameters.
  • the combustion chamber remote end of the nozzle needle 8 with the diameter d 3 forms a control pin 12 which is guided axially displaceably in a central bore 14 in the valve piece 3.
  • the central bore 14 and the combustion chamber remote end face of the control pin 12 of the nozzle needle 8 limit a control room 15.
  • the control room 15 is over a Fuel outlet 16 with a (not shown) Relief space connectable.
  • an outlet throttle 17 is provided in the fuel drain 16 .
  • a Control valve member 18 With help of a Control valve member 18, the fuel outlet 16 be opened and closed.
  • the inlet throttle 19 connects the control chamber 15 with a nozzle spring chamber 20.
  • the nozzle spring chamber 20 communicates with a fuel inlet 24, through which high-pressure fuel passes from the rail (not shown) into the nozzle spring chamber 20.
  • a nozzle spring 21 is arranged in the nozzle spring chamber 20.
  • the nozzle spring 21 is supported with its one end on the peripheral web 26 of the holding body 4. With its other end, the nozzle spring 21 is supported on a spring plate 22.
  • the biasing force of the nozzle spring 21 is transmitted from the spring plate 22 to the nozzle needle 8.
  • a step 23 is formed on the nozzle needle 8 between the control pin 12 with the diameter d 3 and the portion of the nozzle needle 8 with the diameter d 2 .
  • a flattening 25 is formed in the section of the nozzle needle 8 with the diameter d 2 .
  • the flattening 25 creates a connection between the nozzle spring chamber 20 and a pressure chamber 27, which forms a fuel reservoir.
  • the biasing force of the nozzle spring 21 then ensures that the tip 9 of the nozzle needle 8 remains in abutment with its associated seat on the nozzle body 2. In this position of the nozzle needle 8 no injection takes place.
  • the valve piece 3 and the control valve member 18 form a Servo valve.
  • the servo valve can be as simple or be executed double-switching valve.
  • a magnet or a piezo can be used.
  • the inlet throttle 19 in the valve piece 3. From manufacturing and cost reasons, the inlet throttle can also in a other component, e.g. the nozzle needle 8, be formed. It is important that the nozzle spring 21 outside of Control room 15 is located. The preload or the stroke can be adjusted by the thickness of the spring plate 22 become. Instead of a flattening 25 can also several Flattened be attached to the nozzle needle 8. The out the flattening resulting flow cross-section is correct with the inlet bore of a conventional nozzle match.
  • the inlet throttle is not in the Valve piece 3 but arranged in the nozzle needle 8. With High pressure applied fuel passes through a Radial bore 31 and an axial bore 30 with a Inlet throttle 29 in the control room 15th
  • the inlet throttle has the shape of a Axialnut 35 which is attached to the control pin 12. Through the axial groove 35 passes at high pressure Fuel from the area of the flattening 25 at the Nozzle needle 8 in the control room 15th

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)

Claims (10)

  1. Injecteur de rampe commune pour injecter du carburant dans un système d'injection à rampe commune d'un moteur à combustion interne, comportant un corps d'injecteur (1) muni d'une alimentation en carburant (24) communiquant avec un accumulateur central de carburant à haute pression à l'extérieur du corps (1) de l'injecteur et avec une chambre de pression (27) à l'intérieur du corps (1) de l'injecteur, le carburant à haute pression étant injecté en fonction de la position d'une soupape de commande (18) assurant qu'une aiguille d'injecteur (8) mobile selon un mouvement alternatif dans un perçage longitudinal (6) de l'injecteur, axialement contre la force de précontrainte d'un ressort d'injecteur (21) logé dans une chambre à ressort d'injecteur (20), se soulève de son siège lorsque la pression régnant dans la chambre de pression (27) est supérieure à la pression régnant dans une chambre de commande (15), en étant reliée à l'alimentation en carburant (24) par un organe d'étranglement d'alimentation (19),
    caractérisé en ce que
    la chambre de commande (15) est formée par un volume cylindrique dans lequel coulisse de façon étanche un tourillon de commande (12) réalisé à l'extrémité de l'aiguille d'injecteur (8) à l'opposé de celle de la chambre de combustion,
    la chambre à ressort d'injecteurs (20) étant réalisée au niveau de l'extrémité de l'aiguille d'injecteur (8) à l'opposé de la chambre de combustion, au-delà de la chambre de commande (15), et
    la chambre à ressort d'injecteurs (20) entoure en partie l'aiguille d'injecteur (8).
  2. Injecteur de rampe commune selon la revendication 1,
    caractérisé en ce que
    l'alimentation en carburant (24) débouche dans la chambre de ressort (20) d'injecteurs et
    au moins un méplat (25) est réalisé sur l'aiguille d'injecteur (8) entre la chambre à ressort d'injecteurs (20) et la chambre de pression (27).
  3. Injecteur de rampe commune selon l'une des revendications précédentes,
    caractérisé en ce que
    la chambre de commande (15) est réalisée dans une pièce d'injecteur (3) munie d'un perçage de sortie (16) central et d'un organe d'étranglement de sortie (17) ainsi que d'un siège de soupape.
  4. Injecteur de rampe commune selon la revendication 3,
    caractérisé en ce que
    l'étranglement d'alimentation est prévu dans un perçage (19) de la pièce de soupape (3) reliant la chambre de commande (15) à la chambre à ressort d'injecteurs (20).
  5. Injecteur de rampe commune selon la revendication 3,
    caractérisé en ce que
    l'organe d'étranglement d'alimentation (30, 31 ; 35) est intégré à l'aiguille d'injecteur (8).
  6. Injecteur de rampe commune selon la revendication 5,
    caractérisé en ce que
    l'organe d'étranglement d'alimentation (29) est prévu dans un perçage central (30) de l'aiguille d'injecteur (8) communiquant par un perçage radial (31) avec la chambre de ressort d'injecteurs (20).
  7. Injecteur de rampe commune selon la revendication 5,
    caractérisé en ce que
    l'organe d'étranglement d'alimentation est formé par une rainure (35) réalisée dans la direction longitudinale de l'aiguille d'injecteur (8), rainure prévue sur le goujon de commande (12).
  8. Injecteur de rampe commune selon l'une des revendications précédentes,
    caractérisé en ce que
    l'aiguille d'injecteur (8) est guidée par le tourillon de commande (12).
  9. Injecteur de rampe commune selon l'une des revendications précédentes,
    caractérisé en ce que
    l'aiguille d'injecteur (8) est guidée par son extrémité (38) proche de la chambre de combustion.
  10. Injecteur de rampe commune selon l'une des revendications précédentes,
    caractérisé en ce qu'
    un épaulement (23) prévu sur l'aiguille d'injecteur (8), forme une butée pour une coupelle à ressort (22).
EP00962182A 1999-08-04 2000-08-01 Injecteur de carburant pour un système carburant à rampe commune Expired - Lifetime EP1117921B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19936667A DE19936667A1 (de) 1999-08-04 1999-08-04 Common-Rail-Injektor
DE19936667 1999-08-04
PCT/DE2000/002530 WO2001011219A1 (fr) 1999-08-04 2000-08-01 Injecteur a rampe commune

Publications (2)

Publication Number Publication Date
EP1117921A1 EP1117921A1 (fr) 2001-07-25
EP1117921B1 true EP1117921B1 (fr) 2005-04-27

Family

ID=7917133

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00962182A Expired - Lifetime EP1117921B1 (fr) 1999-08-04 2000-08-01 Injecteur de carburant pour un système carburant à rampe commune

Country Status (8)

Country Link
US (1) US6726121B1 (fr)
EP (1) EP1117921B1 (fr)
JP (1) JP2003506620A (fr)
KR (1) KR20010079991A (fr)
AT (1) ATE294325T1 (fr)
CZ (1) CZ20011136A3 (fr)
DE (2) DE19936667A1 (fr)
WO (1) WO2001011219A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19949527A1 (de) * 1999-10-14 2001-04-19 Bosch Gmbh Robert Injektor für ein Kraftstoffeinspritzsystem für Brennkraftmaschinen mit in den Ventilsteuerraum ragender Düsennadel
DE10111783B4 (de) * 2001-03-12 2005-10-20 Bosch Gmbh Robert Einspritzdüse
DE10152173A1 (de) * 2001-10-23 2003-04-30 Bosch Gmbh Robert Magnetventil zur Steuerung eines Einspritzventils
DE10220931C1 (de) * 2002-05-10 2003-11-27 Siemens Ag Injektor zur Kraftstoffeinspritzung
AU2003900748A0 (en) * 2003-02-13 2003-03-06 Vaporate Pty Ltd Fuel delivery system
AT500889B8 (de) * 2004-08-06 2007-02-15 Bosch Gmbh Robert Vorrichtung zum einspritzen von kraftstoff in den brennraum einer brennkraftmaschine
CN100385109C (zh) 2005-01-18 2008-04-30 侯德洋 微位移变截面均匀细雾化复合式喷油器
DE102017000911B3 (de) * 2017-02-02 2018-06-28 L'orange Gmbh Anordnung
US11585452B2 (en) 2019-12-03 2023-02-21 Woodward, Inc. Fuel nozzle with reduced flow tolerance
CN113250876B (zh) * 2021-06-18 2022-04-26 中国北方发动机研究所(天津) 一种滑阀式共轨喷油器
CN116753096B (zh) * 2023-08-11 2023-10-13 山西焦煤集团正仁煤业有限公司 一种煤矿卡车用供油部结构

Family Cites Families (15)

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DE3788406T2 (de) * 1986-09-25 1994-04-14 Ganser Hydromag Zuerich Elektronisch gesteuertes Einspritzsystem.
JPH01224454A (ja) 1988-03-04 1989-09-07 Yamaha Motor Co Ltd エンジンの高圧燃料噴射装置
JPH01244144A (ja) 1988-03-25 1989-09-28 Yamaha Motor Co Ltd エンジンの高圧燃料噴射装置
JPH0466742A (ja) * 1990-07-05 1992-03-03 Yamaha Motor Co Ltd 高圧燃料噴射式エンジンのアイドリング制御装置
DE4404570A1 (de) * 1993-02-27 1994-09-01 Volkswagen Ag Nach dem Akkumulierprinzip arbeitende Kraftstoffeinspritzdüse
JPH08158981A (ja) * 1994-12-02 1996-06-18 Nippondenso Co Ltd 燃料噴射装置
DE4446269A1 (de) 1994-12-23 1996-06-27 Fev Motorentech Gmbh & Co Kg Kraftstoff-Einspritzventil
GB9508623D0 (en) * 1995-04-28 1995-06-14 Lucas Ind Plc "Fuel injection nozzle"
WO1997008452A1 (fr) * 1995-08-29 1997-03-06 Isuzu Motors Limited Dispositif d'injection de carburant du type a accumulation
GB2325024B (en) * 1996-07-25 1999-10-13 Cummins Engine Co Inc A fuel injection system and a unit fuel injector
JP3653882B2 (ja) * 1996-08-31 2005-06-02 いすゞ自動車株式会社 エンジンの燃料噴射装置
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DE19724637A1 (de) 1997-06-11 1998-12-17 Bosch Gmbh Robert Einspritzventil
GB9823134D0 (en) * 1998-10-23 1998-12-16 Lucas Ind Plc Valve

Also Published As

Publication number Publication date
ATE294325T1 (de) 2005-05-15
KR20010079991A (ko) 2001-08-22
CZ20011136A3 (cs) 2002-01-16
US6726121B1 (en) 2004-04-27
EP1117921A1 (fr) 2001-07-25
WO2001011219A1 (fr) 2001-02-15
DE50010158D1 (de) 2005-06-02
JP2003506620A (ja) 2003-02-18
DE19936667A1 (de) 2001-02-22

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