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
  • F02M61/184—Discharge orifices having non circular sections
• • 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
  • F02M61/042—The valves being provided with fuel passages
• • 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
  • 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
• • 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
  • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
• • 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
  • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting

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 downstream of the valve seat surface a perforated disc is provided, which has a plurality of spray-discharge openings.
• the —igerweise 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 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 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 a very high functional integration is achieved in a valve sleeve according to the invention highest precision.
• the valve sleeve is designed as a multi-functional sleeve, as it carries both the valve seat and the valve needle during its axial movement on the inner wall leads.
• the mixture preparation function is also integrated in the multifunction sleeve.
• the precision-drawn valve sleeve injection openings are introduced directly in a curved bottom area.
• a thin perforated disk and a shaping of such a perforated disk after the introduction of the ejection openings are completely dispensed with.
• the fuel injection valve in the valve sleeve itself directly has the ejection openings.
• the introduction of the ejection openings is basically only after the forming of the valve sleeve. The risk of tearing the webs between the spray openings is thus significantly reduced.
• valve sleeve has so many ejection ports that it can act like a multi-fan jet nozzle at the downstream end of the fuel injector so that a multiplicity of spatially offset fan jets emerge from the valve sleeve forming disc packs, diverging the individual fluid lobes move each other and allow air intake between the fan beams.
• fuel sprays with extremely small fuel droplets with a Sauter Mean Diameter (SMD) of approx. 20 ⁇ m can be sprayed off.
• SMD Sauter Mean Diameter
• valve sleeve provides the necessary geometric degrees of freedom for variant-dependent directional and fan-out control of the individual fan beams. With the existing geometry parameters, the beam control can be mastered very well.
• the deep-drawing process is adapted so that in adjacent areas of areas with high precision requirement free-form surfaces are provided, which serve as a material overflow, whereby process fluctuations can be compensated.
• Another possibility for precision improvement is a local heating (laser, induction, resistance heating, friction, chemical reaction) of the valve sleeve during the deep drawing process.
• valve seat surface is, for example, in a finish machining means
• the ejection openings are introduced after the deep-drawing process of the valve sleeve, in particular by means of the ultra-short pulse laser technology.
• This laser technology allows the laser technology production of spray orifices in sufficiently accurate -A-
• Cross-sectional precision e.g. is required for spraying liquid lamellae in multi-fan jet form.
• Figure 1 is a partially illustrated valve in the form of a fuel injection valve with an embodiment of a known multi-fan jet nozzle in one
• FIG. 2 shows the valve end with the multi-fan jet nozzle according to FIG. 1 in a side view rotated by 90 °
• Valve sleeve and Figure 6 is a valve end of a second fuel injection valve according to the invention.
• FIG. 1 is shown as an embodiment, a valve in the form of an injection valve for fuel injection systems of mixture-compression spark-ignition internal combustion engines partially.
• 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 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.
• electromagnetic circuit with a magnetic coil 10, an armature 11 and a core 12.
• the armature 11 is connected to the valve closing body 7 remote from the end of the valve needle 5 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 fixed 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 underlaid 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 kalottator formation of the nozzle portion 28 of the perforated disc 23.
• the perforated disc 23 has, for example, in the region of the longitudinal axis of the valve 2 its greatest distance to the end face 17, while in the region of the weld 26, the perforated disc 23 abuts directly on the valve seat body 16 as a disc without curvature and is stabilized by the support plate 25.
• a plurality of very small spray openings 30 are provided, which are slit-shaped and extend parallel to the direction.
• 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. In this way, the HC emission of the internal combustion engine can be reduced significantly over known injection arrangements very effectively.
• 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.
• FIG. 2 shows the downstream valve end of the fuel injection valve with the perforated disc 23 according to FIG. 1 in a side view rotated by 90 °. It is particularly clear that the central nozzle region 28 has an elongated elliptical shape. While the sprayed-off fuel spray in its longitudinal orientation according to FIG. 1 has, for example, an external angle ⁇ of approximately 15 °, an external angle ⁇ of the fuel spray in its transverse orientation according to FIG. 2 is approximately 30 °.
• Figures 1 and 2 are taken from DE 10 2005 000 620 Al and show insofar 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 semi-circular ring or elliptical or teilelliptisch ( Figures 10 and 11 of DE 10 2005 000 620 Al).
• the curvature of the nozzle region 28 is shaped convexly in the direction of ejection.
• FIG 3 shows a valve end of a fuel injection valve according to the invention, in which a perforated disc 23 is completely dispensed with.
• the risk of crack formation is significantly reduced, since the slot-shaped spray-discharge openings 30 are introduced only after the forming of a valve sleeve 35, which is produced in particular by deep drawing, in this.
• the valve sleeve 35 comprises compared to the fuel injector shown in Figure 1, the components valve seat carrier 1 and valve seat body 16, wherein the valve seat surface 29 is mitausgeformt directly to the inner wall of the valve sleeve 35.
• the valve seat surface 29 is brought to the desired surface quality by means of ring honing, for example, and cured by means of laser.
• the valve sleeve 35 is designed as a multi-functional sleeve, since it carries both the valve seat 29 and the valve needle 5 during its axial movement on the inner wall leads.
• the valve needle 5 is at its downstream end, which acts as a valve closing body 7, without the known flats 8 ( Figure 1) for Flowed past the fuel and instead continues to run hollow cylindrical.
• the valve sleeve 35 has over its downstream peripheral region on a plurality of web-shaped guide portions 36 which are radially inwardly displaced relative to the cylindrical course of the valve sleeve 35 and serve to guide the valve needle 5.
• the guide portions 36 are impressed in the valve sleeve 35 in an odd number, so for example in a number of three or five, as can be seen from the sectional view through the lower end of the valve sleeve 35 in Figure 4.
• On the outer circumference of the valve sleeve 35 results in the areas of the inwardly directed guide portions 36 recesses 41, since the material of the valve sleeve 35 is pressed at these points inwardly, displaced, embossed or the like.
• valve needle 5 is e.g. as well as the valve sleeve 35 made by deep drawing.
• the deep-drawn valve sleeve 35 is provided at the downstream end with a curvature 37, in which the particular slot-shaped spray openings 30 are introduced directly.
• the curvature 37 of the valve sleeve 35 is executed in the embodiment rotationally symmetrical dome-shaped, it can also deviate from e.g. paraboloidal and of theirs
• the ejection openings 30 are introduced after the deep-drawing process by means of the ultra-short-pulse laser technology. For the first time, this laser technology makes it possible to produce injection-molding openings 30 in sufficiently precise cross-sectional precision, which is required for spraying liquid lamellae in multi-fan-beam form (see FIG. 1).
• Spray openings 30 can be formed by means of laser technology perpendicular or obliquely to the surface normal of the curved valve sleeve 35. If both opposing slot longitudinal walls are introduced obliquely and directionally parallel to one another, the center axis of the exiting fan beam can be tilted relative to the surface normal of the curvature 37, regardless of the shape of the curvature 37.
• FIG. 5 shows an enlarged illustration of slotted spray-discharge openings 30 in a valve sleeve 35. It is clear that advantageously the slot walls, which extend in the slot longitudinal direction, not exactly aligned in direction parallel to each other limit the ejection openings 30, but apart in accordance with a fan-beam fanning angle to be set in the ejection direction diverge. Instead of the shown planar walls of the spray-discharge openings 30, these can also be convex / concave. The specific alignment of the laser for generating these walls can be done by deflecting the laser beam via tilting mirrors.
• the ejection openings 30 may have the cross-sectional shape of a rectangle, an ellipse or a lens o.a. to have. Two adjacent ejection openings 30 have e.g. a distance of about 40 to 60 microns.
• Spray openings 30 of the valve sleeve 35 a likewise slot-shaped structure may be provided upstream of the valve seat 29, which serves as a filter 38 and, for. is made by laser.
• FIG. 6 shows a valve end of a second fuel injection valve according to the invention, in which a perforated disc 23 is completely dispensed with.
• this embodiment differs in particular in the configuration of the valve needle 5 and the valve closing body 7 and in the embodiments of the ejection openings 30.
• the formed in particular by deep drawing valve sleeve 35 can also accommodate a known valve needle 5 with a spherical valve closing body 7.
• the combination of the high-precision valve sleeve 35 with a soft, highly elastic valve closing body 7, which adapts to the reshaped valve seat 29, leads to an improved and cost-effective sealing seat.
• the valve sleeve 35 in turn assumes the functions of a valve seat carrier and at the same time the valve seat body, wherein the valve seat surface 29 is mitausgeformt directly to the inner wall of the valve sleeve 35.
• the valve sleeve 35 is designed as a multi-functional sleeve, since it carries both the valve seat 29 and the valve needle 5 during its axial movement on the inner wall leads. In addition to the functions needle guide, fuel passage and leak tightness, the mixture preparation function is also integrated in the multifunction sleeve.
• the spray-discharge openings 30 are introduced directly in an eg curved bottom area.
• the spray-discharge openings 30 can also be circular or polygonal in addition to the slot-shaped configuration described above.
• the ejection openings 30 are introduced after the deep-drawing process by means of the ultra-short-pulse laser technology.
• the deep-drawing process is adapted so that in adjacent areas of areas with high precision requirement free-form surfaces are provided, which serve as a material overflow, whereby process fluctuations can be compensated.
• Another possibility for precision improvement is a local heating (laser, induction, resistance heating, friction, chemical reaction) of the valve sleeve 35 during the deep drawing process.
• the influence of residual stresses and texture are largely reduced by suitable material selection and targeted thermomechanical treatment. This can be done by a final annealing with subsequent Kalibrierarbeitsgang and / or the use of texture-free sheet or plate with rotationally symmetric texture.
• the application of an additional material a higher quality material on the material of the valve sleeve 35 local property improvements in terms of hardness, strength, hardenability, wear, elasticity, etc. can be achieved.
• valve seat surface 29 is brought to the desired surface quality, for example, in a finish machining by means of ring honing with bonded grain and hardened by means of laser.
• the grinding pin is designed so that the valve seat 29 and the needle guide area are processed in a single operation, so that a very good concentricity between the valve seat 29 and guide is achieved. Due to the precise pre-machining, economical reworking with the usual fine machining processes (grinding, lapping, embossing, EDM, ECM, laser processing, electron beam machining, etc.) is also possible at any time.
• the inner contour of the valve sleeve 35 is precisely machined by ⁇ -ECM by scanning the contour with the electrode to perform the ECM process.
• the valve seat surface 29, as shown in Figures 3 to 5 projecting circumferentially bead-like inward, only the bead tip serving the sealing seat must be accurately processed.
• a flexible clamping of the valve sleeve can be achieved that the inner contour of the valve sleeve 35 aligns with the grinding pin, so that caused by the deep drawing position deviations between inner and outer contour are compensated.
• the valve sleeve 35 is preferably aligned with the inner contour to allow a positionally correct mounting of the valve sleeve 35 on the fuel injection valve.
• the preparation of the injection openings 30 can be carried out by all common methods, such as drilling, punching, laser drilling, EDM, ECM, EDCM, ion beam, electron beam.

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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)

Priority Applications (3)

Applications Claiming Priority (4)

Publications (1)

Family

ID=40459888

Family Applications (1)

Country Status (5)

Cited By (1)

Families Citing this family (7)

Citations (7)

Family Cites Families (27)

• 2008
  • 2008-12-17 JP JP2010538716A patent/JP2011506849A/ja active Pending
  • 2008-12-17 EP EP08865539.4A patent/EP2238337B1/de not_active Not-in-force
  • 2008-12-17 WO PCT/EP2008/067792 patent/WO2009080671A1/de not_active Ceased
  • 2008-12-17 DE DE102008054840A patent/DE102008054840A1/de not_active Withdrawn
  • 2008-12-17 US US12/809,689 patent/US8430078B2/en not_active Expired - Fee Related

Patent Citations (7)

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