EP1597473B1 - Dispositif d'injection de carburant, notamment pour moteur a combustion interne a injection directe de carburant - Google Patents

Dispositif d'injection de carburant, notamment pour moteur a combustion interne a injection directe de carburant Download PDF

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Publication number
EP1597473B1
EP1597473B1 EP03769230A EP03769230A EP1597473B1 EP 1597473 B1 EP1597473 B1 EP 1597473B1 EP 03769230 A EP03769230 A EP 03769230A EP 03769230 A EP03769230 A EP 03769230A EP 1597473 B1 EP1597473 B1 EP 1597473B1
Authority
EP
European Patent Office
Prior art keywords
valve element
inner valve
injection device
fuel injection
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
EP03769230A
Other languages
German (de)
English (en)
Other versions
EP1597473A1 (fr
Inventor
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 EP1597473A1 publication Critical patent/EP1597473A1/fr
Application granted granted Critical
Publication of EP1597473B1 publication Critical patent/EP1597473B1/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
    • 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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/086—Having more than one injection-valve controlling discharge orifices
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • 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
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies

Definitions

  • the invention relates to a fuel injection device according to the preamble of claim 1.
  • Such a fuel injection device is known from DE 41 15 477 A1.
  • This shows an injection valve with two coaxially arranged valve elements.
  • An elongate and comparatively thin actuating portion of the inner valve member carries at its end a comparatively thick and adjacent to the valve seat sealing portion.
  • the recess in the outer valve element, in which the inner valve element is arranged, is stepped. Between the sealing portion and the recess in the outer valve element is a gap.
  • Object of the present invention is to develop a fuel injection device of the type mentioned so that it works as effectively as possible.
  • the outer diameter of the inner valve element and the inner diameter of the recess in the outer valve element are stepped and matched to one another.
  • the wall thicknesses or cross-sectional areas of the sealing sections and the actuating sections of the valve elements can be optimally adapted to the desired functions. This is particularly advantageous in view of the extremely small overall dimensions (diameter of a valve element of at most a few millimeters, sometimes significantly less).
  • the sealing section of the inner valve element has a smaller diameter than its actuating section.
  • the outer valve member may have a relatively large sealing portion, so that there existing pressure surface is also relatively large, which simplifies the hydraulic actuation of the outer valve member, especially at low pressures.
  • the operating portion of the inner valve element has a nevertheless sufficiently large in diameter that it has a high rigidity.
  • the sealing portion of the inner valve member may also have a larger diameter than the actuating portion of the inner valve member.
  • This has advantages if the inner valve element relatively large amounts of fuel to be injected, which makes fuel outlet channels with correspondingly large diameters required. Their arrangement is facilitated if, as in the present case, the sealing portion of the inner valve element and, as a result, also the associated valve seat have a comparatively large diameter.
  • the operating portion of the outer valve member may have a comparatively high wall thickness, so that in this case the outer valve member has a high rigidity as a whole.
  • the outer valve element has an upper guide region, in which the actuating portion of the inner valve element is guided at least in regions (the term "top” here is not absolute, but relative to the fuel injection device to understand). This also benefits the centering of the inner valve element in the outer valve element and the lowering of the actuating pressures and thus ultimately the quality of the fuel injection.
  • the fuel injection device forms an existing between the sealing portion and the actuating portion of the inner valve member Paragraph a printing surface. This allows a uniform distribution of the forces acting on the inner valve element hydraulic forces.
  • longitudinally extending recesses be present in the lateral surface of the region of the inner valve element guided by the upper guide region and / or in the lateral surface of the upper guide region of the outer valve element.
  • a fuel system bears the overall reference numeral 10. It is used in an internal combustion engine 12, which is not shown in detail in FIG.
  • the fuel system 10 includes a fuel tank 14 from which an electric fuel pump 16 delivers the fuel to a high pressure fuel pump 18. This compresses the fuel to a very high pressure and conveys it into a fuel rail ("rail") 20. To these are connected via high-pressure lines 22 a plurality of fuel injectors 24, which Inject the fuel directly into them associated combustion chambers 26. The fuel injectors 24 are connected via a low pressure return line 28 to the fuel tank 14 again.
  • FIG. 2 An area of one of the fuel injection devices 24 facing the combustion chamber 26 is shown in detail in FIG. 2:
  • the fuel injector 24 includes a housing 30 in which a stepped blind bore 32 is present. This is connected via a channel 34 to the high-pressure line 22.
  • the lower region of the stepped blind bore 32 in FIG. 2 tapers conically. It is limited by a conical valve seat surface 36.
  • In the valve seat surface 36 open distributed over the circumference of the housing 30 arranged radially outer fuel outlet channels 38 and radially inner fuel outlet channels 40, which respectively pass through the housing wall.
  • two mutually coaxial valve elements are arranged, namely an outer valve element 42 and an inner valve element 44.
  • the outer valve element 42 is guided in a guide region 46 from the housing 30 in a fluid-tight manner.
  • An annular space 48 present in FIG. 2 below the guide region 46 between the outer valve element 42 and the wall of the stepped blind bore 32 is connected to the high-pressure line 22 via the high-pressure passage 34.
  • the annular space 48 has a bulge 50, at the level of which on the outer valve element 42 there is a pressure surface 52 acting in the opening direction of the outer valve element 42.
  • the lower end of the outer valve element 42 in FIG. 2 is also conical with two conical surfaces 54 and 56 of different conicity. Between these a sealing edge 58 is present.
  • the two conical surfaces 54 and 56 with the sealing edge 58 are provided on a sealing portion 60 of the outer valve member 42, whereas the pressure surface 52 is provided on an actuating portion 62 of the outer valve member 42.
  • the inner valve member 44 is received in a stepped bore 64 of the outer valve member 42.
  • the stepped bore 64 in this case has a portion 66 with a smaller and a portion 68 with a larger diameter.
  • the inner valve element 44 has in the section 68 of the stepped bore 64 a sealing section 70 which has a larger diameter than an actuating section 72 of the inner valve element 44, which is arranged in the section 66 of the stepped bore 64 of the outer valve element 42. Between the two sections 70 and 72 of the inner valve member 44, a shoulder is present, which forms an annular pressure surface 74.
  • the sealing portion 70 of the inner valve member 44 includes a cylinder portion 76 which is fluid-tightly guided in the portion 68 of the stepped bore 64.
  • the section 68 is therefore also referred to as "lower guide area".
  • the sealing section 70 comprises two regions of different conicity. These are delimited by an outer conical surface 78 or an inner conical surface 80, between which a sealing edge 82 is present.
  • the operating portion 72 of the inner valve member 44 has two regions 84 and 86 of different diameters.
  • the immediately adjacent to the sealing portion 70 region 84 has a slightly smaller diameter than the portion 66 of the stepped bore 64 in the outer valve member 42.
  • the outer diameter of the region 86 of the actuating portions 72 corresponds approximately to the inner diameter of the portion 66 of the stepped bore 64 in the outer valve member 42.
  • This region of the stepped bore 62 therefore forms an upper guide portion 88, in which the actuating portion 72 of the inner valve member 44 is guided.
  • the region 86 of the actuating portion 72 of the inner valve member 44 extending in the axial direction grooves 90 are introduced.
  • the fuel injection device 24 shown in Figure 2 can be operated stroke or pressure controlled or in a combination of two control principles. It is conceivable, for example, that the outer valve element 42 operates under pressure control, that an opening movement of the outer valve element 42 is thus effected by an increase in pressure in the annular space 48. As a result, the hydraulic force acting on the pressure surface 52 and on the outer conical surface 54 increases, which finally leads, contrary to a constant closing force, to a lifting of the sealing edge 58 from the valve seat surface 36.
  • the inner valve member 44 may be stroke controlled. This means that its sealing edge 82 only lifts off from the valve seat surface 36 due to a constant opening force when the hydraulic force acting on the annular pressure surface 74 in the closing direction is at least is lowered briefly. This is possible by the annular space present between the region 84 of the actuating section 72 and the inner wall of the stepped bore 64 and by the grooves 90 which pass through the region 86 of the actuating section 72 of the inner valve element 44. It is also conceivable, however, for the inner valve element 44 to be pressure-controlled, so that for an opening movement of the inner valve element 44, a corresponding, briefly increased, hydraulic force must act on the outer conical surface 78. In this case, the annular space between the region 84 of the actuating portion 72 and the stepped bore 64 and the grooves 90 in the region 86 for depressurization of the pressure surface 74 formed between the actuating portion 72 and the sealing portion 70 is used.
  • the inner fuel outlet channels 40 have a comparatively large diameter. This requires a comparatively large diameter in the region of the valve seat or, in other words, a large diameter of the sealing section 70 in the region of the sealing edge 82. Nevertheless, a high rigidity of the outer valve element 42 can be realized by the stepped bore 64 in the outer valve element 42.
  • FIG. 3 shows an alternative fuel injection device 24.
  • elements and areas which have equivalent functions to elements and areas of the fuel injection device 24 shown in Figure 2, the same reference numerals. They are not explained again in detail.
  • the sealing portion 70 of the inner valve member 44 has a smaller diameter than its operating portion 72.
  • the portion 66 of the stepped bore 64 in the outer valve member 42 has a larger diameter than the portion 68.
  • the diameter of the inner fuel Exit channels 40 significantly smaller than in the previous embodiment.
  • the sealing portion 60 of the outer valve member 42 may be larger overall, so that the inner cone surface 56 may be larger.
  • a secure opening of the outer valve element 42 is ensured even at low pressures in the annular space 48.
  • high pressures are required to generate at the comparatively small outer conical surface 78 of the inner valve element 44 that hydraulic force acting in the opening direction, which finally leads to a lifting of the sealing edge 82 from the valve seat surface 36.
  • the high forces can be well absorbed by the comparatively thick actuating portion 72 of the inner valve member 44, so this has sufficient rigidity. Due to the grooves 90 and the gap between the region 84 of the actuating portion 72 of the inner valve member 44 and the inner wall of the stepped bore 64, the pressure surface 74 can still be relieved sufficiently.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Claims (6)

  1. Dispositif d'injection de carburant (24) notamment pour des moteurs à combustion (12) à injection directe de carburant, comprenant un boîtier (30), un élément extérieur de soupape (42) équipant le boîtier et ayant une cavité (64) recevant au moins par zone, un élément de soupape intérieur (44) coopérant avec au moins un siège de soupape (36) par l'intermédiaire d'une arête d'étanchéité (82) et un segment d'étanchéité (70) au voisinage de celui-ci ainsi qu'un segment d'actionnement (72) relié à celui-ci et éloigné du siège d'étanchéité (36), ces segments ayant des diamètres différents,
    la cavité (64) prévue dans l'élément extérieur (42) recevant l'élément intérieur (44), des segments (66, 68) de diamètres différents, au moins sensiblement adaptés aux diamètres des segments (70, 72) de l'élément intérieur (44), et
    l'élément extérieur (42) ayant une zone de guidage inférieure (68) qui guide au moins par zone, le segment d'étanchéité (70) de l'élément intérieur (44).
  2. Dispositif d'injection de carburant (24) selon la revendication 1,
    caractérisé en ce que
    le segment d'étanchéité (70) de l'élément intérieur (44) a un diamètre plus petit que son segment d'actionnement (72).
  3. Dispositif d'injection de carburant (24) selon la revendication 1,
    caractérisé en ce que
    le segment d'étanchéité (70) de l'élément de soupape intérieur (44) a un diamètre plus grand que son segment d'actionnement (72).
  4. Dispositif d'injection de carburant (24) selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'élément extérieur (42) a une zone de guidage supérieure (88) guidant au moins par zone, le segment d'actionnement (72) de l'élément intérieur (44).
  5. Dispositif d'injection de carburant (24) selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le décrochement existant entre le segment d'étanchéité (70) et le segment d'actionnement (72) de l'élément intérieur (44) forment une surface de pression (74).
  6. Dispositif d'injection de carburant (24) selon l'une quelconque des revendications 4 et 5,
    caractérisé par
    des cavités (90) prévues dans la surface enveloppe de la zone de l'élément intérieur (44) guidées par le segment de guidage supérieur (88) et/ou dans la surface enveloppe de la zone de guidage supérieure de l'élément extérieur, ces cavités étant globalement orientées dans la direction longitudinale.
EP03769230A 2003-02-08 2003-10-08 Dispositif d'injection de carburant, notamment pour moteur a combustion interne a injection directe de carburant Expired - Lifetime EP1597473B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10305187 2003-02-08
DE10305187A DE10305187A1 (de) 2003-02-08 2003-02-08 Kraftstoff-Einspritzvorrichtung, insbesondere für Brennkraftmaschinen mit Kraftstoff-Direkteinspritzung
PCT/DE2003/003329 WO2004070191A1 (fr) 2003-02-08 2003-10-08 Dispositif d'injection de carburant, notamment pour moteur a combustion interne a injection directe de carburant

Publications (2)

Publication Number Publication Date
EP1597473A1 EP1597473A1 (fr) 2005-11-23
EP1597473B1 true EP1597473B1 (fr) 2006-12-20

Family

ID=32730893

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03769230A Expired - Lifetime EP1597473B1 (fr) 2003-02-08 2003-10-08 Dispositif d'injection de carburant, notamment pour moteur a combustion interne a injection directe de carburant

Country Status (7)

Country Link
US (1) US20060151638A1 (fr)
EP (1) EP1597473B1 (fr)
JP (1) JP2006521484A (fr)
CN (1) CN1745241A (fr)
AT (1) ATE348951T1 (fr)
DE (2) DE10305187A1 (fr)
WO (1) WO2004070191A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1719903B1 (fr) * 2005-05-03 2008-08-27 Delphi Technologies, Inc. Arrangement pour une soupape d'injection de carburant à mode de commutations
JP4535037B2 (ja) * 2006-02-08 2010-09-01 株式会社デンソー インジェクタおよび燃料噴射装置
JP4226011B2 (ja) * 2006-02-16 2009-02-18 株式会社デンソー 燃料噴射装置
JP6488134B2 (ja) * 2015-01-26 2019-03-20 日立オートモティブシステムズ株式会社 燃料噴射弁

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2710138A1 (de) * 1977-03-09 1978-09-14 Maschf Augsburg Nuernberg Ag Mehrloch-einspritzduese
DE3036583A1 (de) * 1980-09-27 1982-05-13 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzduese
DE3236046C2 (de) * 1982-09-29 1986-03-20 Daimler-Benz Ag, 7000 Stuttgart Kraftstoffeinspritzdüse für Brennkraftmaschinen
DE3433710A1 (de) * 1984-09-14 1986-03-27 Robert Bosch Gmbh, 7000 Stuttgart Elektrisch gesteuerte pumpeduese fuer die kraftstoffeinspritzung bei dieselbrennkraftmaschinen
DE4115477C2 (de) * 1990-05-17 2003-02-06 Avl Verbrennungskraft Messtech Einspritzdüse für eine Brennkraftmaschine
US5899389A (en) * 1997-06-02 1999-05-04 Cummins Engine Company, Inc. Two stage fuel injector nozzle assembly
EP0967382B1 (fr) * 1998-06-24 2004-11-24 Delphi Technologies, Inc. Injecteur de carburant
GB9819746D0 (en) * 1998-09-11 1998-11-04 Lucas Ind Plc Fuel injector
DE19843344A1 (de) * 1998-09-22 2000-03-23 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
US6776358B2 (en) * 1998-10-09 2004-08-17 Jun Arimoto Fuel injection nozzle for a diesel engine
GB9904938D0 (en) * 1999-03-04 1999-04-28 Lucas Ind Plc Fuel injector
GB9913314D0 (en) * 1999-06-09 1999-08-11 Lucas Ind Plc Fuel injector
GB9914642D0 (en) * 1999-06-24 1999-08-25 Lucas Ind Plc Fuel injector
GB9914644D0 (en) * 1999-06-24 1999-08-25 Lucas Ind Plc Fuel injector
DE10141678A1 (de) * 2001-08-25 2003-05-08 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10162651A1 (de) * 2001-12-20 2003-09-04 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10315821A1 (de) * 2002-11-11 2004-05-27 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
EP1637730B1 (fr) * 2004-09-17 2014-04-16 Delphi International Operations Luxembourg S.à r.l. Injecteur de combustible et procédé de fabrication

Also Published As

Publication number Publication date
JP2006521484A (ja) 2006-09-21
EP1597473A1 (fr) 2005-11-23
US20060151638A1 (en) 2006-07-13
DE50306076D1 (de) 2007-02-01
ATE348951T1 (de) 2007-01-15
DE10305187A1 (de) 2004-08-19
CN1745241A (zh) 2006-03-08
WO2004070191A1 (fr) 2004-08-19

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