EP1117921A1 - Injecteur a rampe commune - Google Patents

Injecteur a rampe commune

Info

Publication number
EP1117921A1
EP1117921A1 EP00962182A EP00962182A EP1117921A1 EP 1117921 A1 EP1117921 A1 EP 1117921A1 EP 00962182 A EP00962182 A EP 00962182A EP 00962182 A EP00962182 A EP 00962182A EP 1117921 A1 EP1117921 A1 EP 1117921A1
Authority
EP
European Patent Office
Prior art keywords
chamber
nozzle
nozzle needle
pressure
common rail
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.)
Granted
Application number
EP00962182A
Other languages
German (de)
English (en)
Other versions
EP1117921B1 (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

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
    • 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 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 within the injector housing , from which high-pressure fuel is injected depending on the position of a control valve, which ensures that an axially in a longitudinal bore of an injector against the biasing force of a nozzle spring, which in a
  • Nozzle spring chamber is received, reciprocating nozzle needle lifts from 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.
  • 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 high-pressure accumulator to the individual injectors, which 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, the nozzle needle lifts off its seat against the biasing force of the nozzle spring, and high-pressure fuel is injected into the combustion chamber.
  • the object of the invention is to provide a common rail injector which, using conventional injection nozzles, permits significantly higher nozzle needle speeds.
  • the injector according to the invention should be simple and inexpensive to manufacture.
  • the task is in a common rail injector for injecting fuel in a common rail injection system of an internal combustion engine, the one
  • Injector housing with a fuel inlet that communicates with a central high-pressure fuel reservoir outside the injector housing and with 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 one in a longitudinal bore of the injector axially against the biasing force of a nozzle spring, which is received in a nozzle spring chamber, reciprocally movable nozzle needle from a seat when the pressure in the
  • Pressure chamber is greater than the pressure in a control room that Is connected to the fuel supply via an inlet throttle, in that the control chamber is formed by a cylindrical space in which a control pin formed on the end of the nozzle needle remote from the combustion chamber can be moved under sealing action, and in that the nozzle spring chamber in the region of the end of the nozzle needle remote from the combustion chamber outside the control room is arranged. It is also conceivable to accommodate the nozzle spring in the control room. However, the installation space of the nozzle spring can have an unfavorable effect on the function of the injector. In order to achieve acceptable closing speeds, a high degree of spring stiffness is required, which in turn requires a large installation space. This increases the control room volume and the behavior of the injector deteriorates. Of these, in particular
  • the invention provides the advantage that the
  • Control chamber and the nozzle spring chamber at the end of the nozzle needle remote from the combustion chamber can be combined 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.
  • nozzle needle speeds that are greater than 1 m / s can be achieved when opening and closing. Because of that in the
  • Control chamber movable control pin, the nozzle needle diameter can be chosen arbitrarily.
  • the functional dimension which can be, for example, 3 mm
  • the manufacturing dimension which can be, for example, 4 mm
  • a special embodiment of the invention is characterized in that the fuel inlet opens into the nozzle spring chamber and that at least one flattening is formed on the nozzle needle between the nozzle spring chamber and the pressure chamber. The flattening creates a flow connection between the nozzle spring chamber and the pressure chamber, through which the fuel to be injected reaches the pressure chamber from the fuel inlet.
  • the existing bore to the pressure chamber in conventional injectors can be omitted.
  • control chamber is formed in a valve piece which has a central drain hole with an outlet throttle and a valve seat.
  • the central drain hole creates a connection between the control room and a relief room.
  • the valve seat interacts with a control valve member of a 2/2-way valve which controls the injection process of the injector according to the invention.
  • inlet throttle is integrated in the valve piece or in the nozzle needle.
  • the inlet throttle can have the shape of a bore or a groove. For manufacturing and / or cost reasons, one or the other embodiment is preferable.
  • Another special embodiment of the invention is characterized in that the nozzle needle is guided through the control pin. Due to the functional principle according to the invention, no internal leakage occurs on the guide in the unactuated state. This leads to lower specific consumption values.
  • Another special embodiment of the invention is characterized in that the nozzle needle is guided at its end near the combustion chamber. The additional guidance of the nozzle needle increases the operational safety and the service life of the injector.
  • Another particular embodiment of the invention is characterized in that a step is formed on the nozzle needle, which step forms a stop for a spring plate.
  • the spring plate forms an abutment for the nozzle spring and at the same time the stroke stop for the
  • Nozzle needle By choosing a suitable thickness of the spring plate, both the pretensioning force of the nozzle spring and the nozzle needle stroke can be set.
  • Figure 1 a first embodiment of an injector according to the invention with inlet throttle in
  • Figure 2 a second embodiment of an injector according to the invention with inlet throttle in the nozzle needle;
  • Figure 3 a third embodiment of an injector according to the invention with a throttle groove in the nozzle needle
  • Figure 4 a fourth embodiment of a injector according to the invention with throttle groove and separate needle guide.
  • the first exemplary embodiment of the injector according to the invention shown in longitudinal section in FIG. 1, has an injector housing, designated overall by 1.
  • the injector housing 1 comprises a nozzle body 2, which projects with its lower free end into the combustion chamber of the internal combustion engine to be supplied. With its upper end face remote from the combustion chamber, the nozzle body 2 is clamped axially against a holding body 4 by means of a clamping nut 5.
  • An inner circumferential web 26 is formed on the holding body 4.
  • a valve piece 3 is supported on the circumferential web 26 with a collar.
  • An axial longitudinal bore 6 is recessed in the nozzle body 2.
  • a nozzle needle 8 is axially slidably received.
  • a sealing surface is formed which interacts with a sealing seat which is formed on the nozzle body 2.
  • a spray hole 10 is closed in the nozzle body 2.
  • the nozzle needle 8 has three areas with different diameters ⁇ lf d 2 and d 3 .
  • the diameter d 2 is the largest, and the diameters d x and d 3 are the same size in the present exemplary embodiment, but can also have different diameters.
  • the end of the nozzle needle 8 remote from the combustion chamber with the diameter d 3 forms a control pin 12 which is axially in a central bore 14 in the valve piece 3 is guided.
  • the control chamber 15 is via a
  • Fuel outlet 16 can be connected to a relief chamber (not shown).
  • An outlet throttle 17 is provided in the fuel outlet 16.
  • the fuel outlet 16 can be opened and closed with the aid of a control valve member 18.
  • Fuel can get into the control chamber 15 through an inlet throttle 19.
  • the inlet throttle 19 connects the control chamber 15 to a nozzle spring chamber 20.
  • the nozzle spring chamber 20 is connected to a fuel inlet 24 through which high-pressure fuel reaches the nozzle spring chamber 20 from the rail (not shown).
  • a nozzle spring 21 is arranged in the nozzle spring chamber 20.
  • the nozzle spring 21 is supported at one end on the circumferential web 26 of the
  • Diameter d 3 and the portion of the nozzle needle 8 with the diameter d 2 a step 23 is formed.
  • a flat 25 is formed in the section of the nozzle needle 8 with the diameter d 2 .
  • the flat 25 creates a connection between the nozzle spring chamber 20 and a pressure chamber 27, which forms a fuel reservoir.
  • the fuel outlet 16 is closed by the control valve member 18, there is rail pressure in the control chamber 15 and the pressure chamber 27.
  • the biasing force of the nozzle spring 21 then ensures that the tip 9 of the nozzle needle 8 on their associated seat on the nozzle body 2 remains in contact. No injection takes place in this position of the nozzle needle 8.
  • the valve piece 3 and the control valve member 18 form a servo valve.
  • the servo valve can be designed as a single or double switching valve.
  • a magnet or a piezo can be used as the actuator.
  • the inlet throttle 19 is located in the valve piece 3.
  • the inlet throttle can also be in another component, e.g. the nozzle needle - 8, be formed. It is important that the nozzle spring 21 is located outside the control room 15. The preload or the stroke can be adjusted by the thickness of the spring plate 22.
  • a plurality of flattenings can also be provided on the nozzle needle 8. The flow cross-section resulting from the flattening corresponds to the inlet bore of a conventional nozzle.
  • the nozzle needle 8 is pressed into the seat by the rail pressure.
  • the sum of the control room and nozzle spring closing force outweighs the seat force at the needle seat.
  • the injection is initiated by the pressure relief of the control room 15.
  • Nozzle needle 8 lifts off • the seat and beats to the final throw with spring washer 22 on unit 3.
  • the opening and closing speed is determined by the cross-section of the control pin 12, the displaced volume of which acts as an additional source (when opening) or sink (when closing) in the case of a fixed outlet / inlet ratio.
  • the needle diameter In order not to shift the balance of forces between the needle seat and control pin on one side, one would have to reduce the needle diameter from 4 mm to about 3 to 3.5 mm in conventional common rail systems with a push rod. The production and cost side is problematic here.
  • the advantage of the invention is that the hydraulically effective diameter is independent of the geometrically predetermined needle diameter. As soon as the control valve member 18 closes again, the pressure in the control chamber 15 rises and the nozzle needle 8 returns to the seat.
  • Valve piece 3 but arranged in the nozzle needle 8. High-pressure fuel enters the control chamber 15 via a radial bore 31 and an axial bore 30 with an inlet throttle 29.
  • the inlet throttle is in the form of an axial groove 35, which is attached to the control pin 12. High-pressure fuel reaches the control chamber 15 through the axial groove 35 from the area of the flat 25 on the nozzle needle 8.
  • an additional guide 38 is formed at the end of the nozzle needle 8 near the combustion chamber.
  • Several sections 39 provide a flow connection from the pressure chamber 27 to the nozzle needle tip 9.

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)
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 true EP1117921A1 (fr) 2001-07-25
EP1117921B1 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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Publication number Priority date Publication date Assignee Title
EP0262539B1 (fr) * 1986-09-25 1991-01-09 Ganser-Hydromag Soupape d'injection de combustible
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
GB9622335D0 (en) * 1996-10-26 1996-12-18 Lucas Ind Plc Injector arrangement
US5860597A (en) * 1997-03-24 1999-01-19 Cummins Engine Company, Inc. Injection rate shaping nozzle assembly for a fuel injector
DE19724637A1 (de) 1997-06-11 1998-12-17 Bosch Gmbh Robert Einspritzventil
GB9823134D0 (en) * 1998-10-23 1998-12-16 Lucas Ind Plc Valve

Non-Patent Citations (1)

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Title
See references of WO0111219A1 *

Also Published As

Publication number Publication date
WO2001011219A1 (fr) 2001-02-15
DE50010158D1 (de) 2005-06-02
ATE294325T1 (de) 2005-05-15
DE19936667A1 (de) 2001-02-22
US6726121B1 (en) 2004-04-27
KR20010079991A (ko) 2001-08-22
EP1117921B1 (fr) 2005-04-27
JP2003506620A (ja) 2003-02-18
CZ20011136A3 (cs) 2002-01-16

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