EP2072805A2 - Soupape d'injection de combustible - Google Patents

Soupape d'injection de combustible Download PDF

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Publication number
EP2072805A2
EP2072805A2 EP08105679A EP08105679A EP2072805A2 EP 2072805 A2 EP2072805 A2 EP 2072805A2 EP 08105679 A EP08105679 A EP 08105679A EP 08105679 A EP08105679 A EP 08105679A EP 2072805 A2 EP2072805 A2 EP 2072805A2
Authority
EP
European Patent Office
Prior art keywords
fuel injection
nozzle
injection valve
valve
valve according
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
EP08105679A
Other languages
German (de)
English (en)
Other versions
EP2072805A3 (fr
EP2072805B1 (fr
Inventor
Joerg Heyse
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 EP2072805A2 publication Critical patent/EP2072805A2/fr
Publication of EP2072805A3 publication Critical patent/EP2072805A3/fr
Application granted granted Critical
Publication of EP2072805B1 publication Critical patent/EP2072805B1/fr
Expired - Fee Related 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
    • F02M61/1853—Orifice plates
    • 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
    • F02M61/184—Discharge orifices having non circular sections

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim.
  • a fuel injection valve is already known, in which a perforated disc is provided downstream of the valve seat surface, which has a plurality of injection openings.
  • the especiallyigerweise ten to twenty spray orifices are located in a plane of the perforated disc, which is perpendicular to the valve longitudinal axis.
  • the largest part of the ejection openings is obliquely or inclined introduced into the perforated disc, so that the opening axes of the ejection openings have no parallelism to the valve longitudinal axis. Since the inclinations of the ejection openings can be chosen differently, a divergence of the individual jets to be sprayed is easily achievable.
  • the ejection openings are introduced, for example, by laser drilling in the perforated disk in a largely uniform size.
  • the fuel injector is particularly suitable for fuel injection systems of mixture-compression spark-ignition internal combustion engines.
  • a fuel injection valve is already known in which a slot-shaped outlet opening is provided at the downstream end.
  • the outlet opening is formed either in a perforated disc or directly in the nozzle body itself.
  • the slot-shaped outlet openings are always introduced centrally on the valve longitudinal axis, so that the injection of the fuel takes place axially parallel from the fuel injection valve out.
  • a swirl groove is provided, which sets the fuel flowing to the valve seat in a circular rotational movement.
  • the flat outlet opening ensures that the fuel is hosed fan-like.
  • a fuel injector for direct injection of fuel into a combustion chamber of an internal combustion engine from the US 6,019,296 A , in which at the downstream end, a slot-shaped outlet opening is provided, can emerge from the fuel at an angle to the valve longitudinal axis.
  • the fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that in a perforated disc with a large number of spray openings, in particular of directionally parallel spray slots, the risk of cracking the material webs between two adjacent spray openings is significantly reduced.
  • the crack-critical transverse expansion of the curvature of the nozzle region of the perforated disk is reduced in that the elliptical bulge shape is significantly widened compared to the known configuration, so that a largely quadrangular basic outline of the nozzle region results. Due to this broadening in the center of the nozzle area, the "foot" of the curvature is less steeply rising towards the vaulting apex. The relative elongation in curvature transverse direction is thereby minimized during forming, whereby the risk of tearing of the webs between the ejection openings is reduced.
  • Microgalvanic perforated discs are easy to produce and reproducible in large numbers. This also applies to spray-discharge openings, in particular Spray-discharge slots with delicate opening structures, eg with slot widths of approx. 20 to 50 ⁇ m and slot lengths of up to 150 ⁇ m.
  • FIG. 1 a partially illustrated valve in the form of a fuel injection valve with an embodiment of a known multi-fan jet nozzle in a side view
  • FIG. 2 the valve end with the multi-fan jet nozzle according to FIG. 1 in a 90 ° rotated side view
  • FIG. 3 the multi-fan jet nozzle in a side view according to FIG. 2
  • FIG. 4 the multi-fan jet nozzle in a side view according to FIG. 1
  • FIG. 5 the multi-fan jet nozzle in a bottom view
  • FIG. 6 a first embodiment of a multi-fan jet nozzle according to the invention
  • FIG. 7 a second embodiment of a multi-fan jet nozzle according to the invention
  • FIG. 8 a third embodiment of a multi-fan jet nozzle according to the invention.
  • FIG. 1 For example, as an embodiment, a valve in the form of an injector for fuel injection systems of mixture-compression spark-ignition internal combustion engines is partially shown.
  • the fuel injection valve has a tubular valve seat carrier 1, which only schematically indicates a part of a valve housing and in which a longitudinal opening 3 is formed concentrically to a valve longitudinal axis 2.
  • a longitudinal opening 3 In the longitudinal opening 3 is a z.
  • the actuation of the fuel injection valve takes place in a known manner, for example electromagnetically.
  • An actuation of the fuel injection valve with a piezoelectric or magnetostrictive actuator is also conceivable.
  • a schematically indicated electromagnetic circuit with a solenoid 10, an armature 11 and a core 12.
  • the armature 11 is connected to the valve closing body.
  • 7 opposite end of the valve needle 5 is connected by, for example, a trained by a laser weld and aligned with the core 12.
  • valve seat body 16 In the downstream end of the valve seat carrier 1 is a valve seat body 16, e.g. tightly assembled by welding.
  • a perforated disc 23 is attached in the form of a multi-fan jet nozzle as atomizer.
  • the connection of valve seat body 16 and perforated disc 23 is effected, for example, by a circumferential and dense laser-formed weld 26, which is e.g. is provided on the end face 17 or on the outer circumference of valve seat body 16 and perforated disc 23.
  • the perforated disc 23 is engaged by a support plate 25.
  • the support disk 25 is annular in order to receive a central dome-shaped or domed nozzle-like nozzle region 28 of the perforated disk 23 in an inner opening.
  • an outlet opening 27 is provided, from which the fuel to be sprayed enters a flow cavity 24, which is formed by the curved or kalott Arthur formation of the nozzle portion 28 of the perforated disc 23.
  • the perforated disc 23 for example, in the region of the longitudinal axis of the valve 2 to the greatest distance from the end face 17, while in the region of the weld 26, the perforated disc 23 rests as a disc without curvature directly on the valve seat body 16 and is stabilized by the support plate 25.
  • a sufficiently pressure-stable and thick design of the microgalvanically produced perforated disc 23 can be completely dispensed with a support plate 25.
  • the formation of the nozzle portion 28 is above all in the FIGS. 3 to 5 clear.
  • a plurality of very small spray openings 30 are provided, which are slot-shaped and extend in parallel.
  • the ejection openings 30 have a slot width of approximately 20 to 50 ⁇ m and a slot length of up to 150 ⁇ m, so that fuel sprays with extremely small fuel droplets with a Sauter Mean Diameter (SMD) of approximately 20 ⁇ m can be sprayed off.
  • SMD Sauter Mean Diameter
  • Per perforated disc 23 are provided between two and sixty injection orifices 30, wherein a number of eight to forty injection orifices 30 brings optimal atomization results.
  • FIG. 2 shows the downstream valve end of the fuel injection valve with the perforated disc 23 according to FIG. 1 in a 90 ° rotated side view.
  • the central nozzle region 28 has an elongated elliptical shape. While the sprayed fuel spray in its longitudinal direction according to FIG. 1 For example, has an outer angle ⁇ with about 15 °, an outer angle ⁇ of the fuel spray in its transverse orientation according to FIG. 2 about 30 °. Via the nozzle region 28 with the many ejection openings 30, an elliptical fuel spray is thus emitted, which decomposes into the finest droplets.
  • FIGS. 3, 4 and 5 is the perforated disc 23 in side views according to FIGS. 1 and 2 and again shown as a single component in a bottom view.
  • the ejection openings 30 are arranged centrally in the nozzle area 28 and are each formed with identical size and shape.
  • the ejection openings 30 may have the cross-sectional shape of a rectangle, an ellipse or a lens or the like. to have.
  • two adjacent spray openings 30 have a spacing of approximately 40 to 60 ⁇ m.
  • the perforated disc 23 is produced in an advantageous manner mikrogalvanisch.
  • the ejection openings 30 have by this manufacturing technology perpendicular to the disk surface extending walls.
  • FIGS. 1 to 5 are the DE 10 2005 000 620 A1 taken and thus show a known multi-fan jet nozzle 23.
  • the central nozzle portion 28 with the spray-discharge openings 30 is formed by embossing technology after the galvanic production of the disc.
  • embossing tools for producing the nozzle portion 28 of the perforated disc 23 can be used, which are designed either annular or partially annular or elliptical or partially elliptical ( Figures 10 and 11 of DE 10 2005 000 620 A1 ).
  • the curvature of the nozzle region 28 is shaped convexly in the direction of ejection.
  • the curvature of the nozzle portion 28 has an elliptical cross section in the bottom view.
  • the ejection openings 30 are equidistant and lined up parallel to each other.
  • the longitudinal axes of the ejection openings 30 are perpendicular to the longitudinal axis of the ellipse.
  • the curvature of the nozzle portion 28 has along its width a smaller radius of curvature (eg, 0.25 mm) than the radius of curvature along its length (eg, 10 mm), such as FIGS. 3 and 4 clarify.
  • the ejection openings 30 extend with their longitudinal axes along the greater curvature and are therefore strongly convexly curved in the direction of ejection.
  • the flow exiting per spray opening 30 emerges as a flat jet fan due to this curvature ( FIG. 2 ).
  • the fan angle ⁇ results from the curvature and the run length of the ejection openings 30.
  • Each jet fan emerges perpendicular to the surface of the curvature. Consequently, a uniform directional spread is achieved between the individual fan sheds.
  • the total spread angle corresponds to the beam angle ⁇ ( FIG. 1 ).
  • the beam angles ⁇ and ⁇ determine the cross section of the total beam and can be varied as desired.
  • the aspect ratio of the total beam can be customized, for example, to the geometry of a suction tube.
  • FIGS. 6 and 7 and 8th three embodiments of a perforated disc 23 are shown in the form of a multi-fan jet nozzle, in which the risk of cracking is significantly reduced.
  • the crack-critical transverse strain of the curvature is reduced in that the elliptical bulge shape is significantly widened compared to the known configuration, resulting in a substantially quadrangular basic outline of the nozzle region 28.
  • the nozzle portion 28 is formed such that its base has a diamond-like shape, the width of this diamond in the disk center is significantly larger than the width of the elliptical base of the known curvature, as they FIG. 5 is removable.
  • the nozzle area 28 in its diamond shape has a raised longitudinal extent along which the injection openings 30 are arranged.
  • the slot length can be in contrast to the known solutions of the slot-shaped spray openings 30> 150 microns.
  • the length of the ejection openings 30 is dependent on the local width of the outline of the curvature, which is significantly larger in a diamond shape in the center of the curvature than at the curvature ends.
  • the Slit length is thus adaptable to the local curvature width and is, for example, up to 90% of the width of the arching ground plan at each location. This makes it possible, in conjunction with the ground plan shape of the curvature according to the invention, to maximize the spray cross-section in total (q stat ) without the individual slit-shaped spray openings 30 being too wide and resulting in the material webs therebetween being too weak ( FIG. 7 ).
  • FIG. 8 shows a section in the longitudinal direction by the curvature of a nozzle portion 28 of the perforated disc 23 to illustrate a second embodiment of the perforated disc according to the invention 23.
  • This embodiment is characterized in that the curvature in its longitudinal direction is not convex rounded with a constant radius, but in the center the curvature to a point 33 runs, so that the curvature has a medium "kink”.
  • This tapered curvature has 30 space advantages for the schematically registered spray openings, in particular for the frequent application, when a two-jet spray is to be sprayed.
  • the distribution of the spray-discharge openings 30 can take place via the nozzle region 28 close to the tip 33, so that the spray-discharge openings 30 can be distributed more effectively in the nozzle region 28 and the distances between the individual spray-discharge openings 30 can be increased, which also leads to a reduction in the risk of cracking.
  • the tip 33 defines the division of the fuel spray into two beam halves.

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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)
EP20080105679 2007-12-21 2008-10-28 Soupape d'injection de combustible Expired - Fee Related EP2072805B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710062190 DE102007062190A1 (de) 2007-12-21 2007-12-21 Brennstoffeinspritzventil

Publications (3)

Publication Number Publication Date
EP2072805A2 true EP2072805A2 (fr) 2009-06-24
EP2072805A3 EP2072805A3 (fr) 2009-07-08
EP2072805B1 EP2072805B1 (fr) 2012-04-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080105679 Expired - Fee Related EP2072805B1 (fr) 2007-12-21 2008-10-28 Soupape d'injection de combustible

Country Status (2)

Country Link
EP (1) EP2072805B1 (fr)
DE (1) DE102007062190A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19636396A1 (de) 1996-09-07 1998-03-12 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19847625A1 (de) 1997-10-17 1999-04-22 Toyota Motor Co Ltd Brennstoff-Einspritzventil
US6019296A (en) 1997-11-19 2000-02-01 Toyota Jidosha Kabushiki Kaisha Fuel injector for an internal combustion engine
DE102005000620A1 (de) 2005-01-03 2006-07-13 Robert Bosch Gmbh Multi-Fächerstrahl-Düse und Brennstoffeinspritzventil mit Multi-Fächerstrahl-Düse

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040188550A1 (en) * 2003-03-25 2004-09-30 Hitachi Unisia Automotive, Ltd. Fuel injection valve
DE102005000617A1 (de) * 2005-01-03 2006-07-13 Robert Bosch Gmbh Verfahren zur Herstellung eines Schlitzkörpers und Brennstoffeinspritzventil mit einem Schlitzkörper
US20060157595A1 (en) * 2005-01-14 2006-07-20 Peterson William A Jr Fuel injector for high fuel flow rate applications

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19636396A1 (de) 1996-09-07 1998-03-12 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19847625A1 (de) 1997-10-17 1999-04-22 Toyota Motor Co Ltd Brennstoff-Einspritzventil
US6019296A (en) 1997-11-19 2000-02-01 Toyota Jidosha Kabushiki Kaisha Fuel injector for an internal combustion engine
DE102005000620A1 (de) 2005-01-03 2006-07-13 Robert Bosch Gmbh Multi-Fächerstrahl-Düse und Brennstoffeinspritzventil mit Multi-Fächerstrahl-Düse

Also Published As

Publication number Publication date
DE102007062190A1 (de) 2009-06-25
EP2072805A3 (fr) 2009-07-08
EP2072805B1 (fr) 2012-04-11

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