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
• • 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
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49401—Fluid pattern dispersing device making, e.g., ink jet

Definitions

• the invention relates to a fuel injection valve according to the preamble of independent claim 1 and to a method for producing a valve seat for a fuel injection valve according to the preamble of independent claim 6.
• a fuel injection valve which has a spherical valve closing body which cooperates with a flat valve seat surface of a valve seat body.
• a spray perforated disk is firmly connected by means of a weld at the downstream end side thereof.
• This valve seat part consisting of spray perforated disk and valve seat body is tightly fastened in a valve seat carrier.
• the firm connection between the valve seat part and the valve seat carrier takes place on a retaining edge of the spray perforated disk, which is under radial tension, with a circumferential weld.
• the welds are generated in particular by means of laser welding.
• Perforated disks are pressed against the valve seat member and held there. This whole arrangement is additionally secured by an inwardly projecting collar of the valve seat carrier which, like a bead, engages under the securing element. In such an arrangement there is a risk that over the lifetime of the Fuel injection valve, the safe and stable mounting position of the nozzle-side components in the valve seat carrier can not be guaranteed.
• the fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage of a simple and inexpensive solution to achieve a solid secure connection between a valve seat body and a Zerstäubervorsatz which performs the function of a known spray perforated disc.
• the Zerstäubervorsatz is integrated into the valve seat body so that any slippage of the components as well as a delay of valve seat body and / or Zerstäubervorsatz (spray perforated plate) are excluded by avoiding welds, so that the tightness function of the valve over the entire lifetime is guaranteed guaranteed ,
• this is achieved in that the atomizer attachment is adhered to the adhesion directly on the valve seat body.
• valve seat body together with the atomizer attachment formed on it forms a valve seat part which can be introduced and fastened in a simple manner in a valve seat carrier of the fuel injection valve.
• At least one injection opening in the atomizer attachment which preferably widens in a funnel shape in the downstream direction.
• the inventive method for producing a valve seat for a fuel injection valve having the characterizing features of independent claim 6 has the advantage that any temperature load on the valve seat body is avoided and completely eliminates the usual process steps for joining a spray perforated disk on the valve seat body. Instead, the atomizer attachment is built up directly on the valve seat body by a microgalvanization process. This process creates a flat, gap-free connection of the atomizer attachment and the Valve seat body with the usual adhesion to 450 N / mm 2 for electrochemical deposited metals.
• an adapted metal foil with a conductive adhesive or a conductive foil resist is applied directly to a lower end face of the valve seat body.
• about the size, shape and dimensions of the metal foil or the film resist can be the size, shape and dimensions of a Anströmhohlraums set within the subsequent Zerstäubervorsatzes.
• the Anströmhohlraum can be freely chosen in its design and, for. be formed over a large area or multiple channels.
• FIG. 1 shows a partially illustrated prior art fuel injector according to the prior art
• Figures 2 to 4 process steps for producing a valve seat body according to the invention with an integrated spray perforated disk atomizer for a fuel injector
• Figure 5 is a schematic bottom view of the valve seat body with two flow variants in the molded atomizer attachment
• FIG. 1 an already known valve in the form of an injection valve for fuel injection systems of mixture-compression spark-ignited internal combustion engines is partially shown.
• the injection valve has a tubular valve seat carrier 1 in which a longitudinal opening 3 is formed concentrically to a valve longitudinal axis 2.
• a longitudinal opening 3 is formed concentrically to a valve longitudinal axis 2.
• tubular valve needle 5 is arranged, which are provided at its downstream end 6 with a spherical valve closing body 7, at the periphery, for example, five Abfiach Institute 8 are provided.
• the actuation of the injection valve takes place in a known manner, for example, electromagnetically.
• piezoelectric or magnetostrictive actuators are likewise conceivable as excitation elements.
• a solenoid 10 For axial movement of the valve needle 5 and thus to open against the spring force of a return spring or closing the injector, not shown, serves an indicated electromagnetic circuit with a solenoid 10, an armature 11 and a core 12.
• the armature 11 is facing away with the valve closing body 7 End of the valve needle 5 by z.
• B. a weld by means of a laser and aligned with the core 12.
• the magnet coil 10 surrounds the core 12, which represents the end of an inlet nozzle (not shown in greater detail) enclosing the magnet coil 10 and serving to supply the fuel to be metered by means of the valve.
• the core 11 remote from the end of the valve seat support 1 is in the concentric to the valve longitudinal axis 2 extending longitudinal opening 3 of the cylindrical valve seat body 16 is tightly mounted by welding in order to guide the valve closing body 7 during the axial movement.
• the circumference of the valve seat body 16 has a slightly smaller diameter than the longitudinal opening 3 of the valve seat carrier 1.
• valve seat body 16 and spray disk 21 are carried out by a circumferential and sealed, z. B. formed by a laser first weld 22 in its central region 24, the bottom part 20 of the spray disk 21 at least one, for example four formed by eroding or punching injection orifices 25 on.
• a circumferential retaining edge 26 which faces away from the valve seat body 16 in the axial direction and is bent conically outwards to its end 27.
• the retaining edge 26 exerts a radial spring action on the wall of the longitudinal opening 3.
• the insertion depth of the consisting of valve seat body 16 and cup-shaped spray disc 21 valve seat part in the longitudinal opening 3 determines the size of the stroke of the valve needle 5, since the one end position of the valve needle 5 in non-energized solenoid 10 by the contact of the valve closing body 7 on a valve seat surface 29 of the valve seat body 16th is fixed.
• the other end position of the valve needle 5 is fixed in the excited magnet coil 10, for example, by the system of the armature 11 to the core 12.
• the path between these two end positions of the valve needle 5 thus represents the hub.
• the spherical valve closing body 7 cooperates with the valve seat surface 29 of the valve seat body 16, which tapers in the direction of the flow in the flow direction and is formed in the axial direction between the guide opening 15 and the lower end side 17 of the valve seat body 16.
• the invention is therefore based on the object, a spray disk 21 to be integrated on a valve seat body 16 that any slippage of the components as well as a delay of valve seat body 16 and / or spray orifice plate 21 by avoiding Welds are excluded, so that the tightness function of the valve over the entire lifetime is guaranteed guaranteed.
• FIGS. 2 to 4 schematically show method steps for producing a valve seat body 16 according to the invention with an integrated spray perforated disk 21 for a fuel injection valve.
• the spray perforated disk 21 is referred to below as atomizer attachment 121, since the structure formed on the valve seat body 16 can also deviate significantly from a disk shape.
• the Zerstäubervorsatz 121 is characterized in that it is provided in at least one spray orifice 125, which determines the beam shape, the beam angle and the flow rate by their size, contouring, opening width and tilt.
• the erfmdungshacke method for producing a valve seat for a fuel injection valve has the great advantage that any temperature load on the valve seat body 16 is avoided and conventional process steps for joining the spray perforated disk 21 on the valve seat body 16 completely eliminated.
• the atomizer attachment 121 is constructed directly on the valve seat body 16 by a microgalvanization process. This process produces a flat, gap-free connection of the atomizer attachment 121 and the valve seat body 16 with the adhesive strength values customary for electrochemically deposited metals up to 450 N / mm 2 .
• valve seat body 16 which ideally already has a finished valve seat surface 29.
• valve seat body 16 already has a downstream of the valve seat surface 29 formed outlet opening 31, which opens at the lower end face 17 of the valve seat body 16.
• a metal foil 35 adapted to the valve seat body 16 is applied to the end face 17 with conductive adhesive.
• conductive film resist can also be applied directly to the end face 17.
• the size, shape and dimensions of the metal foil 35 determine the size, shape and dimensions of the Anströmhohlraums 135 within the later Zerstäubervorsatzes 121.
• a negative structure of the later atomizer attachment 121 is produced by means of photolithography.
• the photolithography comprises the application of a photoresist 36 in the form of structured photoresist towers, the exposure of the photoresist 36 and the development of the photoresist 36.
• the metal structure to be realized is to be transferred inversely in the photoresist 36 with the aid of a photolithographic mask.
• a photolithographic mask there is the possibility of exposing the photoresist 36 directly via the mask by means of UV exposure (UV depth lithography with UV lamp or UV LED).
• a laser ablation is suitable, wherein after the application of a mask explosively material of the photoresist 36 is removed by means of a laser. After the development of the UV-exposed photoresist 36 or the use of other methods (dry etching, ablation) results in a predetermined structure by the mask in the photoresist 36, which is a negative structure to the later Zerstäubervorsatz 121 ( Figure 2).
• the subsequent process step of electroplating is an electrochemical metal deposition.
• the deposition of the metal 37 begins at the same time on the exposed annular surface of the lower end face 17 of the valve seat body 16 and on the metal foil 35 or on the conductive foil resist.
• the metal 37 is applied by the plating closely to the contour of the negative structure of the photoresist 36, so that the predetermined contours are faithfully reproduced in it.
• the height of the electroplating layer of the metal 37 should largely correspond to the height of the photoresist 36.
• the choice of material to be deposited depends on the particular requirements of the atomizer attachment 121, with particular emphasis on the factors of mechanical strength, chemical resistance, weldability and others. Usually, Ni, NiCo, NiFe or Cu are used; but there are also other metals and alloys conceivable ( Figure 3).
• the metal foil 35 and the photoresist 36 are dissolved out of the wrapped structure of metal 37.
• This can be z. B. by a KOH treatment or by an oxygen plasma or by means of solvents (eg acetone) in polyimides.
• solvents eg acetone
• These processes of dissolving out the photoresist 36 are generally below
• the removal of the photoresist 36 and the metal foil 35 results in an atomizer attachment 121, which is directly molded onto the valve seat body 16, having at least one, usually a multiplicity of In the galvano formation, the growth of the metal 37 takes place, for example, in such a way that arched marginal areas remain when the metal deposit is stopped, through which the ejection openings 125 extend in a funnel shape in the downstream direction (FIG.
• the valve seat body 16 forms, together with the atomizer attachment 121, a valve seat part which can be introduced into the longitudinal opening 3 of a valve seat carrier 1 and fastened there.
• Figure 5 shows a schematic bottom view of the valve seat body 16 with two Anströmsupplementaryn in the molded atomizer attachment 121. While on the left side of an embodiment of a single circular sector-shaped Anströmhohlraums 135 is shown, from which all spray orifices 125 are supplied with the fluid to be sprayed, is on the 5 shows a variant in which each ejection opening 125 is connected to a single channel-like Anströmhohlraum 135.
• a conductive film resist is applied directly to the lower end face 17 of the valve seat body 16 and structured as a negative mold of these channel-like Anströmhohltechnik 135. This is followed by a second structuring step with conventional photoresist 36 for producing the ejection openings 125 in the manner described with reference to FIGS. 2 to 4.

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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)

Applications Claiming Priority (2)

Publications (1)

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ID=38870309

Family Applications (1)

Country Status (6)

Families Citing this family (8)

Family Cites Families (6)

• 2006
  • 2006-12-05 DE DE102006057279A patent/DE102006057279A1/de not_active Withdrawn
• 2007
  • 2007-10-17 CN CNA2007800449875A patent/CN101563537A/zh active Pending
  • 2007-10-17 US US12/305,179 patent/US20110139121A1/en not_active Abandoned
  • 2007-10-17 EP EP07821424A patent/EP2100029A1/de not_active Withdrawn
  • 2007-10-17 WO PCT/EP2007/061059 patent/WO2008068104A1/de active Application Filing
  • 2007-10-17 JP JP2009539681A patent/JP2010511833A/ja not_active Withdrawn

Non-Patent Citations (1)

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