EP2129903B1 - Kraftstoffinjektor mit einer zusätzlichen ablaufdrossel oder mit einer verbesserten anordnung derselben im steuerventil - Google Patents

Kraftstoffinjektor mit einer zusätzlichen ablaufdrossel oder mit einer verbesserten anordnung derselben im steuerventil Download PDF

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Publication number
EP2129903B1
EP2129903B1 EP08701558A EP08701558A EP2129903B1 EP 2129903 B1 EP2129903 B1 EP 2129903B1 EP 08701558 A EP08701558 A EP 08701558A EP 08701558 A EP08701558 A EP 08701558A EP 2129903 B1 EP2129903 B1 EP 2129903B1
Authority
EP
European Patent Office
Prior art keywords
bore
throttle
valve
fuel
guide
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.)
Active
Application number
EP08701558A
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German (de)
English (en)
French (fr)
Other versions
EP2129903A1 (de
Inventor
Holger Rapp
Wolfgang Stoecklein
Andreas Rettich
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2129903A1 publication Critical patent/EP2129903A1/de
Application granted granted Critical
Publication of EP2129903B1 publication Critical patent/EP2129903B1/de
Active 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F02M63/008—Hollow valve members, e.g. members internally guided
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0043—Two-way valves

Definitions

  • the present invention relates to a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine according to the closer defined in the preamble of claim 1, such as in the EP 1731752 ,
  • a fuel injector which comprises a liftable guided in an injector body valve piston which cooperates in its lifting movement with the nozzle needle.
  • the nozzle needle projects directly into the area of the control valve.
  • the valve piston or the nozzle needle adjoin a control chamber, which can be acted upon by high fuel pressure. If the control chamber is subjected to high-pressure fuel, the valve piston or the nozzle needle is moved along the lifting axis in the direction of the injection openings in the lower region of the fuel injector, so that the injection openings are closed.
  • the fuel injector further includes a valve piece which merges into a guide portion which is cylindrically shaped and extends into the guide bore of a valve needle.
  • the valve needle is guided on the guide portion and can take an opening position and a closed position by a movement along the lifting axis.
  • a channel system For venting the control chamber, a channel system is provided, which consists of at least one riser hole. These vent the control chamber into an annular space, which is introduced through a constriction in the jacket area of the guide section. If the valve needle is arranged in a lower vertical position along the lifting axis, then the annular space is closed, so that the pressure in the control chamber remains at high fuel pressure level. If the valve needle is raised, the compressed fuel can flow out of the annular space into a discharge chamber, so that the pressure in the control chamber decreases. Adjacent to the annulus is in the obliquely arranged riser or one with the centric riser cooperating transverse bore an outlet throttle provided to limit the pressure reduction rate and thus the lifting speed of the valve needle.
  • the invention includes the technical teaching that between the end of the riser and the annulus at least one throttle bore with a throttle cross-section which is smaller than the riser hole portion to form the drainage throttle.
  • the cross section of the throttle bore is expanded before exiting into the annular space to form a diffuser section of larger diameter.
  • the diffuser portion may be formed either cylindrical or conical, wherein the opening of the cone points in the direction of the annulus.
  • the throttle bore has a cross-section which is made so small that the desired throttle effect is achieved. In the diffuser section adjoining the section of the throttle bore, the flow of the fuel can be homogenized over the flow cross section so that it flows into the annular space in a calmer state.
  • the advantage is achieved that between the Ab horrraum, in which the fuel prevails at a low pressure, and the outlet throttle remains a small volume, so that is reduced by the small remaining volume and the harmful volume. Only the volume of the annular space and parts of the channels for fuel passage between the riser hole and the annular space form a potential harmful volume so that according to a further advantageous embodiment of the annulus itself can be made relatively small. Thus, a further reduction of the damage volume can be caused in order to further improve the advantages of the present invention.
  • the throttle bores and the diffuser section extend along a bore axis, and this extends at an angle to the stroke axis, wherein the angle has a value of 45 °
  • an optimization of the flow behavior is achieved, so that the fuel is not - as in Trap of a transverse bore - a flow deflection of 90 ° is subjected. Therefore, a calmer fuel flow is achieved, which makes a better control of the throttle effect achievable.
  • Both the portion formed by the throttle bore and the adjoining portion of the diffuser bore extend concentrically with the bore axis.
  • the orifice can either be mechanically drilled conventionally, and an erosion process or a laser drilling process is an advantageous application in which very small and accurate bore geometries can be created.
  • an erosion process or a laser drilling process is an advantageous application in which very small and accurate bore geometries can be created.
  • At least two throttle bores extend between the end of the riser bore and the annular space, which are arranged opposite one another at an angle of 180 °. Furthermore, there is the possibility of creating a plurality of throttle bores with adjoining diffuser sections, so that the respective bore axes extend radially evenly distributed on the circumference of the guide section out of this into the annular space.
  • FIGS. 1 to 4 are not covered by the scope of the patent.
  • FIGS. 1 . 3 and 5 each views of a fuel injector 1 are shown, which only show different embodiments of the outlet throttle 12.
  • the fuel injector 1 according to the invention comprises an injector body 2, in which a valve piston 3 is guided in a liftable manner. The lifting movement of the valve piston 3 takes place along a lifting axis 4, wherein the valve piston 3 is adjacent to a control chamber 10 at the end.
  • the control chamber 10 can be acted upon by an inlet throttle with high fuel pressure, so that in a high-pressure state of the control chamber 10 of the valve piston 3 in the direction of - not shown in detail - injectors within the injector body 2 is pressed.
  • valve piston 3 can move vertically upwards in FIG Move the direction of the lifting axis 4, so that the injection openings are released.
  • a guide portion 7 Adjacent to the valve piece 8, a guide portion 7 is formed, which merges into the valve piece 8 in one piece and of the same material.
  • the guide section 7 has a cylindrical shape which extends into the guide bore 6 of a valve needle 5.
  • the valve needle 5 is guided on the guide portion 7 hubbeweglich in the direction of the lifting axis 4, and can be pulled vertically by an electromagnet.
  • valve needle 5 When the electromagnet is energized, the valve needle 5 is attracted by an armature section formed on it, so that the valve needle 5 transitions into an open position. When the energization of the electromagnet is stopped, a valve spring pushes the valve needle 5 vertically back down into the sealing seat. The sealing effect is created by a sealing edge at the lower end of the valve needle 5, which comes into sealing engagement with the guide section or against the valve piece in an annular manner.
  • the fuel passes through the riser 9, wherein the outlet throttle according to the invention is formed by a corresponding geometric configuration between the riser 9 and the annular space 11.
  • the different embodiments of the outlet throttle according to the invention are in a detailed view in the Figures 2 . 4 and 6 and are described below.
  • FIG. 2 shows the outlet throttle 12 according to a first example.
  • the enlarged section according to the FIG. 2 shows the riser 9 within the valve piece 8, which projects at least partially into the guide portion 7.
  • a transverse bore 14 is mounted, wherein in the region of the transition of the riser 9 in the transverse bore 14, a throttle geometry 15 is introduced.
  • the fuel therefore exits the control chamber through the riser 9, so that when the valve needle 5 is vertically moved upward in the direction of the lifting axis 4, fuel can escape from the annular space 11 in the outer region of the valve needle 5.
  • the fuel from the riser 9 passes through the transverse bore 14 into the annular space 11, so that the throttle geometry 15 is flowed through.
  • the transition from the riser bore into the funnel-shaped region of the throttle geometry includes a flow restriction to achieve the required throttle effect.
  • the pressure in the riser 9 remains at an elevated level, so that the Schadvolumen does not form within the riser 9, but is either completely suppressed or forms only in the region of the annulus, but this formed correspondingly small is.
  • FIG. 4 shows a further example of an outlet throttle in the region of the transition from the riser 9 into the annular space 11.
  • the formed within the valve piece 8 riser 9 comprises a riser hole 17, which is formed according to this embodiment considerably larger than the transverse bore cross section 16 of the transverse bore 14.
  • the transverse bore 14 extends transversely to the direction of extension of the lifting axle 4, and forms the connection between the riser 9 and the annular space 11. If the fuel from the riser 9 flows through the transverse bore 14 in the annular space 11, so does the small cross-section of the transverse bore 14 with the transverse bore cross-section 16, the outlet throttle 12.
  • the transverse bore 14 is applied over the entire cross section of the guide section 7 in the region of the annular space 11, so that the fuel flows into the annular space 11 at two points of discharge. If the transverse bore cross-section 16 is smaller, the throttling effect of the outlet throttle is increased, whereby the throttle effect decreases with a larger cross-section.
  • FIGS. 5 and 6 show an embodiment of the discharge throttle 12 according to the invention in the region between the riser 9 and the annular space 11. This is formed by two at an angle of about 45 ° to the lifting axis 4 extending bore axes, so that the fuel through the respective throttle holes 18 from the riser 9th flows into the annular space 11.
  • the throttle bores 18 have a small cross-section in order to achieve the throttling effect, wherein these pass into an enlarged diffuser section 19 before entering the annular space.
  • the diffuser section has an enlarged cross-section so that the amount of fuel exiting the throttle bore can settle to flow into the annulus 11 with less flow turbulence.
  • the cross-section of the riser 9 with the riser 17 can be made arbitrarily large, without the volume forms in the form of a Schadvolumens, as well as in the riser 9 according to this embodiment, the outlet throttle 12 forms a high fuel level, even if the valve needle 5 in the open State is.
  • the arrangement of the throttle bore 18 and the diffuser portion 19 along the bore axis 20 at an angle of approximately 45 ° causes the fuel does not have to be deflected, and the flow channel has a total of a soft contour.
  • the invention is not limited in its execution to the above-mentioned preferred embodiment. Rather, a number of variants is conceivable.

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  • 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)
EP08701558A 2007-02-26 2008-01-17 Kraftstoffinjektor mit einer zusätzlichen ablaufdrossel oder mit einer verbesserten anordnung derselben im steuerventil Active EP2129903B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007009165A DE102007009165A1 (de) 2007-02-26 2007-02-26 Kraftstoffinjektor mit einer zusätzlichen Ablaufdrossel oder mit einer verbesserten Anordnung derselben im Steuerventil
PCT/EP2008/050507 WO2008104423A1 (de) 2007-02-26 2008-01-17 Kraftstoffinjektor mit einer zusätzlichen ablaufdrossel oder mit einer verbesserten anordnung derselben im steuerventil

Publications (2)

Publication Number Publication Date
EP2129903A1 EP2129903A1 (de) 2009-12-09
EP2129903B1 true EP2129903B1 (de) 2012-05-30

Family

ID=39410032

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08701558A Active EP2129903B1 (de) 2007-02-26 2008-01-17 Kraftstoffinjektor mit einer zusätzlichen ablaufdrossel oder mit einer verbesserten anordnung derselben im steuerventil

Country Status (6)

Country Link
US (1) US8186609B2 (ru)
EP (1) EP2129903B1 (ru)
JP (1) JP5039153B2 (ru)
DE (1) DE102007009165A1 (ru)
RU (1) RU2480614C2 (ru)
WO (1) WO2008104423A1 (ru)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018114111A1 (de) 2016-12-22 2018-06-28 Robert Bosch Gmbh Kraftstoffinjektor und dessen verwendung

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006049885A1 (de) * 2006-10-23 2008-04-24 Robert Bosch Gmbh Injektor zur Einspritzung von Kraftstoff in Brennräume von Brennkraftmaschinen
DE102007038138A1 (de) * 2007-08-13 2009-02-19 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor
DE102007038394A1 (de) * 2007-08-14 2009-02-19 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor
DE102008044096A1 (de) * 2008-11-27 2010-06-02 Robert Bosch Gmbh Verfahren zur Herstellung von Drosselbohrungen mit niedrigem Kaviationsumschlagpunkt
DE102009026774A1 (de) * 2009-06-05 2010-12-09 Robert Bosch Gmbh Schaltventil
ATE523684T1 (de) * 2009-07-23 2011-09-15 Fiat Ricerche Brennstoffeinspritzvorrichtung mit mess- servoventil für einen verbrennungsmotor
EP2674608B1 (en) * 2012-06-13 2015-08-12 Delphi International Operations Luxembourg S.à r.l. Fuel injector
US10077748B2 (en) 2014-12-23 2018-09-18 Cummins Inc. Fuel injector for common rail
EP4337855A1 (en) 2021-05-14 2024-03-20 Rain Bird Corporation Self-powered irrigation systems, generator systems and methods of controlling irrigation

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
DE19732802A1 (de) * 1997-07-30 1999-02-04 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
IT1296143B1 (it) * 1997-11-18 1999-06-09 Elasis Sistema Ricerca Fiat Dispositivo di comando di un iniettore di combustibile per motori a combustione interna.
DE10007175B9 (de) 2000-02-17 2004-11-04 Siemens Ag Einspritzventil für die Einspritzung von Kraftstoff in eine Verbrennungskraftmaschine
DE10222196A1 (de) * 2002-05-18 2003-11-27 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
JP3832401B2 (ja) * 2002-08-07 2006-10-11 トヨタ自動車株式会社 燃料噴射装置
RU2273763C2 (ru) * 2004-03-31 2006-04-10 ОАО "Ярославский завод топливной аппаратуры" Электроуправляемая форсунка
EP1621764B1 (en) * 2004-06-30 2007-11-07 C.R.F. Società Consortile per Azioni Internal combustion engine fuel injector
ES2277229T3 (es) 2004-06-30 2007-07-01 C.R.F. Societa Consortile Per Azioni Servovalvula para controlar el inyector de combustible de un motor de combustion interna.
EP1731752B1 (en) 2005-05-27 2010-01-20 C.R.F. Società Consortile per Azioni Fuel-control servo valve, and fuel injector provided with such servo valve
ATE500416T1 (de) * 2007-07-30 2011-03-15 Fiat Ricerche Druckausgeglichenes servoventil für ein brennstoffeinspritzventil einer verbrennungskraftmaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018114111A1 (de) 2016-12-22 2018-06-28 Robert Bosch Gmbh Kraftstoffinjektor und dessen verwendung
DE102016225946A1 (de) 2016-12-22 2018-06-28 Robert Bosch Gmbh Kraftstoffinjektor und dessen Verwendung

Also Published As

Publication number Publication date
RU2480614C2 (ru) 2013-04-27
US8186609B2 (en) 2012-05-29
JP5039153B2 (ja) 2012-10-03
JP2010519461A (ja) 2010-06-03
EP2129903A1 (de) 2009-12-09
DE102007009165A1 (de) 2008-08-28
WO2008104423A1 (de) 2008-09-04
RU2009135424A (ru) 2011-04-10
US20100319660A1 (en) 2010-12-23

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