EP2329133B1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
EP2329133B1
EP2329133B1 EP09780220.1A EP09780220A EP2329133B1 EP 2329133 B1 EP2329133 B1 EP 2329133B1 EP 09780220 A EP09780220 A EP 09780220A EP 2329133 B1 EP2329133 B1 EP 2329133B1
Authority
EP
European Patent Office
Prior art keywords
hole
spray hole
fuel injection
region
injection valve
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.)
Not-in-force
Application number
EP09780220.1A
Other languages
German (de)
English (en)
Other versions
EP2329133A1 (fr
Inventor
Andreas Kerst
Thorsten Rankel
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 EP2329133A1 publication Critical patent/EP2329133A1/fr
Application granted granted Critical
Publication of EP2329133B1 publication Critical patent/EP2329133B1/fr
Not-in-force 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size

Definitions

  • the invention relates to a fuel injection valve, in particular an injector for fuel injection systems of air-compressing, self-igniting internal combustion engines.
  • the known fuel injection valve has a valve body in which a pressure chamber is formed, in the wall of which an injection channel is arranged.
  • the injection channel extends in the valve body and forms an outlet opening on the outside of the valve body.
  • the injection channel seen in the flow direction comprises a first conical portion and an adjoining second conical portion.
  • the two conical sections narrow in the direction of flow. Furthermore, the two conical sections have different opening angles.
  • the fuel injection valve according to the invention with the features of claim 1 has the advantage that a further optimization of a nozzle-near atomization at a high efficiency is possible. Specifically, a nozzle-near atomization can take place without a significant deterioration of the efficiency takes place. Specifically, deflection losses can be substantially avoided or completely prevented.
  • the inflow region of the injection hole is rounded, while the outer hole region is sharp-edged and free of burrs.
  • the rounded-off inflow region preferably proceeds uniformly and without edges into a valve seat surface.
  • a wall of the spray hole is configured such that a flow line extending in the flow direction along a surface of the wall is designed kink-free. As a result, turbulence in the region of the surface of the wall of the spray hole is prevented, whereby flow losses are reduced.
  • a cross-sectional area of the injection hole perpendicular to an axis oriented in the flow direction of the injection hole decreases continuously along the axis in the flow direction.
  • a continuous narrowing of the spray hole is achieved in the flow direction, which can run uniformly, at least in a central portion.
  • the efficiency can be optimized.
  • the cross-sectional area decreases relatively strongly in the outer hole area along the axis in the flow direction.
  • the decrease in the cross-sectional area in a middle region between the inflow region and the outer hole region in the flow direction may decrease uniformly, wherein the decrease of the cross-sectional area in the flow direction in the central region is preferably relatively weak.
  • a deflection can be achieved, which takes place in the middle region towards the axis and is more pronounced in the outer hole region.
  • nozzle-near atomization can be achieved with high efficiency.
  • a tear-off edge is provided in the outer hole region of the injection hole, which is directed onto the axis of the injection hole. As a result, the atomization of the sprayed fuel can be improved.
  • Fig. 1 shows a fuel injection valve 1 in a schematic, partial sectional view according to an embodiment of the invention.
  • the fuel injection valve 1 can serve in particular as an injector for fuel injection systems of air-compressing, self-igniting internal combustion engines.
  • a preferred use of the fuel injection valve 1 is for a fuel injection system with a common rail, the diesel fuel under high pressure leads to a plurality of fuel injection valves 1.
  • the fuel injection valve 1 according to the invention is also suitable for other applications.
  • Partially illustrated fuel injector 1 has a nozzle body 2, in which a nozzle needle 3 is mounted axially displaceable.
  • the nozzle needle 3 is actuated by means of an actuator 4.
  • the actuator 4 may, for example have mechanical and hydraulic components, wherein the control can be effected by means of a piezoelectric actuator or a solenoid valve.
  • the action of the actuating device 4 on the nozzle needle 3 is illustrated by the double arrow 5.
  • the fuel injection valve 1 is suitably connected to a fuel pump, for example via a common rail. During operation of the fuel injection valve 1, therefore, there is fuel under high pressure in a fuel space 6 provided inside the nozzle body 2.
  • the nozzle body 2 has a valve seat surface 7 which cooperates with a valve closing body 8 of the nozzle needle 3 to form a sealing seat.
  • the sealing seat is formed on a sealing edge 9 of the valve seat surface 7. Downstream of the sealing edge 9, the nozzle body 2 has at least one injection hole 15.
  • the injection hole 15 is configured in this embodiment as a blind-hole injection port 15.
  • the spray hole 15 may be configured as a seat hole nozzle injection hole in a suitably designed fuel injector 1.
  • the injection hole 15 has an inflow region 16, a central region 17 and an outer hole region 18.
  • the middle region 17 is located between the inflow region 16 and the outer hole region 18 of the injection hole 15.
  • the injection hole 15 is rounded in the inflow region 16.
  • the injection hole 15 in the outer hole portion 18 has a taper.
  • the injection hole 15 is also in the outer hole area 18th rounded out.
  • a wall 19 of the injection hole 15 is designed so that no steps, edges, kinks or the like are formed in a surface 20 of the wall 19.
  • the surface 20 of the wall 19 is thus at least substantially smooth and uniform.
  • the configuration of the injection hole 15 is also in the following with reference to Fig. 2 described in further detail.
  • Fig. 2 shows the in Fig. 1 With II designated section of the nozzle body 2 of the fuel injection valve 1 in a schematic sectional view.
  • the injection hole 15 has an axis 25, wherein the axis 25 is oriented at least approximately in a flow direction 26.
  • the injection hole 15 is at least approximately symmetrical with respect to the axis 25 configured.
  • a flow line 27 is shown which runs along the surface 20 of the wall 19 of the spray hole 15. It should be noted that the flow line 27 is not in the in the Fig. 2 Section shown extends, since it lies in the surface 20 of the wall 19.
  • the flow line 27 is designed kink-free. As a result, the flow line 27 is both continuous, that is, without steps, as well as even, that is, without abrupt changes in direction along their path, along the surface 20 of the wall 19 out. As a result, in particular turbulences are reduced or completely prevented. As a result, a high efficiency can be achieved when flowing through the spray hole 15 with fuel.
  • a cross-sectional area 28 is illustrated, which is oriented perpendicular to the axis 25 of the spray hole 15.
  • the cross-sectional area 28 of the spray hole 15 may be configured, for example, at least approximately circular or elliptical.
  • the injection hole 15 is designed such that the cross-sectional area 28 decreases along the axis 25 in the flow direction 26. This decrease takes place continuously, wherein, for example, a diameter of the cross-sectional area 28 decreases continuously or at least one of the two main axes of an elliptical cross-sectional area 28 is steadily reduced.
  • the cross-sectional area 28 initially decreases relatively strongly. Furthermore, in a middle region 17 of the spray hole 15, the decrease in the cross-sectional area 28 is relatively weak. In the outer hole region 18, the decrease in the cross-sectional area 28 in the flow direction 26 along the axis 25 is again relatively pronounced. This results in an S-shaped configuration of the flow lines of the spray hole 15, in particular the flow line 27. This allows an advantageous flow through the spray hole 15, wherein the design of the outer hole portion 18, a deflection is achieved, which leads to a nozzle near atomization of the sprayed fuel ,
  • the injection hole 15 has in the outer hole region 18 on a circumferential tear-off edge 29, which is configured, for example, circular or elliptical.
  • the tear-off edge 29 is directed onto the axis 25 of the spray hole 15.
  • the trailing edge 29 supports the atomization of sprayed fuel. This allows a nozzle-near atomization of the fuel with high efficiency.
  • the tear-off edge 29 is designed sharp-edged and burr-free.
  • an acute angle 31 is formed in the sectional view.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (7)

  1. Soupape d'injection de carburant (1), en particulier injecteur pour des systèmes d'injection de carburant de moteurs à combustion interne à auto-allumage et à compression d'air, comprenant un corps d'injecteur (2) qui comprend une surface de siège de soupape (7), une aiguille d'injecteur (3) qui coopère avec la surface de siège de soupape (7) pour former un siège d'étanchéité, afin de réguler un flux de carburant vers au moins un trou d'injection (15), prévu en aval du siège d'étanchéité, du corps d'injecteur (2), le trou d'injection (15) étant réalisé de manière arrondie dans une région d'afflux (16) et le trou d'injection (15) présentant un rétrécissement au moins dans une région de trou extérieure (18), caractérisée en ce que la ligne d'écoulement (27) s'étendant le long de la surface (20) de la paroi (19) est configurée au moins approximativement en forme de S, et une surface en section transversale (28) du trou d'injection (15) située perpendiculairement à un axe (25) du trou d'injection (15) orienté au moins essentiellement dans un sens d'écoulement (26) diminuant de manière continue le long de l'axe (25) dans le sens d'écoulement (26), la configuration en forme de S s'étendant au-delà de la région d'afflux et de la région de trou extérieure.
  2. Soupape d'injection de carburant selon la revendication 1, caractérisée en ce que le trou d'injection (15) est configuré avec des arêtes vives et sans bavures dans la région de trou extérieure (18).
  3. Soupape d'injection de carburant selon la revendication 1 ou 2, caractérisée en ce qu'une paroi (19) du trou d'injection (15) est configurée de telle sorte qu'une ligne d'écoulement (27) s'étendant dans un sens d'écoulement (26) le long d'une surface (20) de la paroi (19) est configurée sans inflexion.
  4. Soupape d'injection de carburant selon la revendication 1, caractérisée en ce que le trou d'injection (15) présente dans la région de trou extérieure (18) une arête de détachement (29) qui est orientée vers l'axe (25) du trou d'injection (15).
  5. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 4, caractérisée en ce qu'une surface en section transversale (28) du trou d'injection (15) située perpendiculairement à un axe (25) du trou d'injection (15) orienté au moins essentiellement dans un sens d'écoulement (26) diminue régulièrement dans le sens d'écoulement (26) dans une région centrale (17) entre la région d'afflux (16) et la région de trou extérieure (18).
  6. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 5, caractérisée en ce que le trou d'injection (15) est configuré sous forme de trou d'injection d'injecteur à trou borgne.
  7. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 6, caractérisée en ce que le trou d'injection (15) est configuré sous forme de trou d'injection d'injecteur à siège perforé.
EP09780220.1A 2008-08-29 2009-07-07 Soupape d'injection de carburant Not-in-force EP2329133B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008041676A DE102008041676A1 (de) 2008-08-29 2008-08-29 Brennstoffeinspritzventil
PCT/EP2009/058556 WO2010023012A1 (fr) 2008-08-29 2009-07-07 Soupape d'injection de carburant

Publications (2)

Publication Number Publication Date
EP2329133A1 EP2329133A1 (fr) 2011-06-08
EP2329133B1 true EP2329133B1 (fr) 2014-09-10

Family

ID=41217795

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09780220.1A Not-in-force EP2329133B1 (fr) 2008-08-29 2009-07-07 Soupape d'injection de carburant

Country Status (5)

Country Link
US (1) US20110155826A1 (fr)
EP (1) EP2329133B1 (fr)
CN (1) CN102132029A (fr)
DE (1) DE102008041676A1 (fr)
WO (1) WO2010023012A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT512423A1 (de) * 2012-02-07 2013-08-15 Bosch Gmbh Robert Einspritzdüse zum einspritzen von medien in den brennraum einer brennkraftmaschine
JP5959892B2 (ja) * 2012-03-26 2016-08-02 日立オートモティブシステムズ株式会社 火花点火式燃料噴射弁
JP2014196702A (ja) * 2013-03-29 2014-10-16 株式会社日本自動車部品総合研究所 燃料噴射ノズル
DE102015205423A1 (de) 2015-03-25 2016-09-29 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen und Verwendung des Kraftstoffeinspritzventils
JP7206601B2 (ja) * 2018-03-08 2023-01-18 株式会社デンソー 燃料噴射弁および燃料噴射システム
JP7124351B2 (ja) * 2018-03-08 2022-08-24 株式会社デンソー 燃料噴射弁および燃料噴射システム
DE102018207717A1 (de) * 2018-05-17 2019-11-21 Robert Bosch Gmbh Vorrichtung zur Erzeugung eines Hochdruckfluidstrahls

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717305A (en) * 1970-12-10 1973-02-20 H Hedges Fuel injection nozzle assembly
DE19925380A1 (de) * 1999-06-02 2000-12-07 Volkswagen Ag Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10105674A1 (de) * 2001-02-08 2002-08-29 Siemens Ag Kraftstoffeinspritzdüse für eine Brennkraftmaschine
DE10124748A1 (de) * 2001-05-21 2003-02-27 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10124745A1 (de) * 2001-05-21 2003-03-27 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10315967A1 (de) 2003-04-08 2004-10-21 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
FR2892452A1 (fr) * 2005-10-26 2007-04-27 Peugeot Citroen Automobiles Sa Chambre de combustion pour moteur a injection directe et moteur comportant ladite chambre

Also Published As

Publication number Publication date
EP2329133A1 (fr) 2011-06-08
WO2010023012A1 (fr) 2010-03-04
CN102132029A (zh) 2011-07-20
DE102008041676A1 (de) 2010-03-04
US20110155826A1 (en) 2011-06-30

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