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
  • F02M61/188—Spherical or partly spherical shaped valve member ends
• • 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
  • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
  • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
  • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
  • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
  • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
  • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
• • 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
• • 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
• • 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
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S239/00—Fluid sprinkling, spraying, and diffusing
  • Y10S239/23—Screens

Definitions

• the invention relates to a fuel injector according to the preamble of the main claim.
• a fuel injection system for a mixture-compressing, spark-ignited internal combustion engine which comprises a fuel injection valve, which injects fuel into a combustion chamber formed by a piston / cylinder structure, and is provided with a spark plug projecting into the combustion chamber.
• the fuel injector is provided with at least one row of injection holes distributed over the circumference of the fuel injector. Through a targeted injection of fuel through the injection holes, a jet-guided combustion process is realized by forming a mixture cloud with at least one jet.
• a disadvantage of the method known from the 'above-mentioned reference fuel injection valve is especially the coking of the injection openings which block and thereby greatly reduce the permitted flow through the fuel injector. This leads to malfunction of the internal combustion engine.
• the fuel injector according to the invention with the characterizing features of the main claim has the advantage that a spray hole cover arranged on the downstream side of the spray openings reduces the temperature of the flame front of the blowing mixture cloud in the area of the spray openings to such an extent that no fuel can precipitate on the valve seat body, causing an increase in the Spray openings due to coking residues is avoided.
• the injection hole cover comprises a cap and a plurality of spacers which serve to fix 'the spray hole cover at the downstream end of the fuel injection valve.
• the number of spacers corresponds to that of the spray openings.
• the spacers can be arranged so that the injection process is not influenced.
• the spray hole cover can be produced in one piece from sheet metal in a simple manner by means of stamping and bending.
• Figure 1 is a schematic section through an embodiment of a fuel injector designed according to the invention in an overall view.
• FIG. 2A shows a schematic section through the spray-side part of the embodiment of the fuel injector according to the invention shown in FIG. 1 in the area IIA in FIG.
• FIG. 2B is a bottom view of the spray hole cover according to the invention against the flow direction in FIG. 2A.
• Fig. 1 shows an exemplary sectional view of an embodiment of an inventive
• Fuel injection valve 1 is designed in the form of a fuel injection valve 1 for fuel injection systems of mixture-compressing, spark-ignition internal combustion engines.
• the fuel injection valve 1 is suitable for injecting fuel directly into a combustion chamber (not shown) of an internal combustion engine.
• the fuel injector 1 consists of a nozzle body 2, in which a valve needle 3 is arranged.
• the valve needle 3 is for example via a weld 41 in operative connection with a valve closing body 4, which cooperates with a valve seat 6 arranged on a valve seat body 5 to form a sealing seat.
• Fuel injector 1 is in the exemplary embodiment an inwardly opening fuel injector 1, which, for. B. has two spray orifices 7.
• the valve closing body 4 of the fuel injector 1 designed according to the invention has an almost spherical shape. This results in an offset-free, cardanic valve needle guide, which ensures an exact functioning of the fuel injection valve 1.
• the valve seat body 5 of the fuel injection valve 1 is cup-shaped, for example, and its shape contributes to the valve needle guidance.
• the valve seat body 5 is inserted into a recess 34 on the injection side of the nozzle body 2 and is connected to the nozzle body 2 by means of a weld seam 35.
• the nozzle body 2 is a seal 8 against an outer pole 9 acting as an actuator for the valve needle 3
• the solenoid 10 is in one
• the inner pole 13 and the outer pole 9 are separated from one another by a gap 26 and are supported on one
• the solenoid 10 is a
• Line 19 is excited by an electrical current that can be supplied via an electrical plug contact 17.
• the plug contact 17 is surrounded by a plastic sheath 18, which can be molded onto the inner pole 13.
• valve needle 3 is guided in a valve needle guide 14, which is disc-shaped.
• a paired adjusting disk 15 is used for stroke adjustment.
• An armature 20 is located on the other side of the adjusting disk 15. This armature is non-positively connected via a first flange 21 to the valve needle 3, which is connected to the first flange 21 by a weld seam 22.
• One is supported on the first flange 21 Return spring 23, which in the present design of the fuel injector 1 is preloaded by a sleeve 24.
• a second flange 31 is arranged on the outflow side of the armature 20 and serves as a lower armature stop. It is non-positively connected to the valve needle 3 via a weld seam 33. Between the armature 20 and the second flange 31 there is an elastic intermediate ring 32 for damping armature bumpers when the fuel injector closes
• Fuel channels 30a and 30b run in the valve needle guide 14 and in the armature 20.
• the fuel is supplied via a central Brennstof 'supplied to 16 and filtered through a filter element 25th Grindings 36 on the valve closing body 4 take over the fuel supply to the sealing seat in the area of the valve seat body 5.
• the fuel injector 1 is sealed by a seal 28 against a distribution line, not shown.
• the fuel injection valve 1 has a spray hole cover 37 on the valve seat body 5, which is arranged in a recess 34 in the nozzle body 2 and is connected to it, for example, by means of a weld 35, which is attached to the outflow side of the spray openings 7.
• the spray hole cover 37 reduces by their arrangement downstream of the spray orifices 7, the tendency to octave and thus prevents malfunctions of the fuel injector 1 by clogging the spray orifices 7 and an impermissible reduction in the fuel flow.
• the injection-side end 42 of the fuel injection valve 1 with the measures according to the invention is shown in more detail in FIGS. 2A and 2B.
• the armature 20 rests on the intermediate ring 32, which is supported on the second flange 31.
• the magnet coil 10 When the magnet coil 10 is excited, it builds up a magnetic field which moves the armature 20 in the stroke direction against the spring force of the return spring 23.
• the armature 20 takes the first flange 21, which is welded to the valve needle 3, and thus also the valve needle 3 in the lifting direction.
• the valve closing body 4, which is operatively connected to the valve needle 3, lifts off from the valve seat surface 6, as a result of which the fuel is sprayed off at the spray openings 7.
• the armature 20 drops from the inner pole 13 after the magnetic field has been sufficiently reduced by the pressure of the return spring 23 on the first flange 21, as a result of which the valve needle 3 moves against the stroke direction.
• the valve closing body 4 rests on the valve seat surface 6, ' and the fuel injector 1 is closed.
• the armature 20 rests on the armature stop formed by the second flange 31.
• FIG. 2A shows an excerpted sectional illustration of the section designated IIA in FIG. 1 from the exemplary embodiment of a fuel injector 1 designed according to the invention shown in FIG. 1.
• the valve seat body 5 in the exemplary embodiment has a spray hole cover 37 on an outer end face 39 facing the combustion chamber, which is not shown in any more detail.
• the spray hole cover 37 has an inner cover cap 43 and a plurality of outer spacers 38, which are fixed, for example by means of spot welds 40, to the valve seat body 5.
• the cover cap 43 and the spacers 38 are preferably formed in one piece and can be produced, for example, by punching and bending from a sheet metal.
• the coking of the spray openings 7 can be reduced by the arrangement of the spray hole cover 37 on the outflow side of the spray openings 7.
• the diameter of the spray openings 7 is typically approximately 100 ⁇ m, the risk that the spray openings 7 become blocked by coking over time and thus the flow rate is impermissibly restricted is usually relatively great. This is due in particular to the high temperatures when the mixture cloud injected into the combustion chamber is ignited, since this causes components of the fuel to deposit on the tip of the fuel injector 1.
• the spray hole cover 37 By attaching the spray hole cover 37, the surface temperature in the outlet area of the ejection openings 7 can be reduced so that the discharge orifices' 7 can not grow by carbon residues.
• the spray hole cover 37 which thus has the function of flame protection, thereby prevents the flame front from spreading in the area between the spray hole cover 37 and the valve seat body 5.
• the above-mentioned flame protection function of the spray hole cover 37 can be supported by a corresponding shaping of the cover cap 43.
• This is preferably designed in the form of a cone, the tip of the cone being directed counter to the spray direction of the fuel.
• FIG. 2B shows a bottom view against the flow direction of the fuel, the valve seat body 5 of the fuel injector 1 designed according to the invention with the spray hole cover 37 fixed thereon and the spray openings 7 projected into it.
• the spray hole cover 37 has six spacers 38 which are arranged at regular angular intervals with spaces 44 from one another. So that the injection process from the spray openings 7 is not hindered by the spacers 38, the spray openings 7 are each open an angle bisector of the angles enclosed by two spacers 38. Wetting of the spray hole cover 37 can thereby be prevented.
• the conical shape of the cap 43 described above also contributes to a wetting-free injection, since the fuel jets leaving the spray openings 7 are guided tangentially along the flanks of the cap 43.
• the spray hole cover 37 can be easily adapted to arrangements of spray openings 7 which, for example, have more or less or unevenly arranged spray openings 7.
• the inner cap 43 should always cover all spray openings 7 in a projection into one plane, as is shown in FIG. 2B.
• the invention is not limited to the exemplary embodiments shown and can be used for any construction of fuel injection valves 1.

Landscapes

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

Applications Claiming Priority (3)

Publications (1)

Family

ID=7689445

Family Applications (1)

Country Status (5)

Families Citing this family (10)

Family Cites Families (14)

• 2001
  • 2001-06-26 DE DE10130685A patent/DE10130685A1/de not_active Withdrawn
• 2002
  • 2002-06-18 WO PCT/DE2002/002208 patent/WO2003002869A1/de not_active Application Discontinuation
  • 2002-06-18 US US10/363,446 patent/US6837449B2/en not_active Expired - Fee Related
  • 2002-06-18 JP JP2003508823A patent/JP2004521257A/ja active Pending
  • 2002-06-18 EP EP02748591A patent/EP1404967A1/de not_active Withdrawn

Non-Patent Citations (1)

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