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
  • F02M61/1873—Valve seats or member ends having circumferential grooves or ridges, e.g. toroidal
• • 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
  • F02M51/0682—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 the body being hollow and its interior communicating with the fuel flow
• • 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
  • F02M61/188—Spherical or partly spherical shaped valve member ends

Definitions

• the invention relates to a valve, in particular a fuel injection valve for internal combustion engines, according to the preamble of the main claim. It's already a
• Fuel injection valve known (DE 42 21 185 AI), in which a spherical valve closing body interacts with a conical valve seat surface and bears sealingly against a contact circle of the valve seat surface when the valve is closed. Due to the
• valve closing body and valve seat surface or damage to their surfaces due to particles carried in the fuel there is a risk that a certain amount of fuel will escape from the valve in an undesirable manner despite the valve closing body being in contact with the valve seat surface.
• the valve according to the invention with the characterizing features of the main claim has the advantage that the tightness is improved in the closed state of the valve and the durability is increased and the tightening times over the operating time in one change smaller dimensions.
• the improvement of the tightness of the valve in the closed state results from the fact that the pressure drop prevailing between the inside and the outside of the valve is successively reduced at two throttle points, namely at the first circular edge between the
• FIG. 1 shows it 2 shows a partial representation of the valve according to FIG. 1 on a different scale.
• FIG. 1 partially shows an example of a valve based on an otherwise already known fuel injection valve for fuel injection systems of mixture-compressing spark-ignition internal combustion engines, which is designed according to the invention.
• the fuel injector has a tubular valve housing 1, in which a longitudinal opening 3 is formed concentrically with a valve longitudinal axis 2. In the longitudinal opening 3 is a z.
• tubular valve needle 5 which is connected at its downstream end 6 with a spherical valve closing body 7, on the circumference of which, for example, five circular flats 8 are provided.
• the fuel injector is actuated in a known manner, for example electromagnetically.
• An indicated electromagnetic circuit with a magnet coil 10, an armature 11 and a core 12 is used for the axial movement of the valve needle 5 and thus for opening against the spring force of a return spring (not shown) or closing the fuel injector.
• the armature 11 is facing away from the valve closing body 7 End of the valve needle 5 by z. B. a weld seam connected by a laser and aligned with the core 12.
• a guide opening 15 of a valve seat body 16 is used to guide the valve closing body 7 during the axial movement.
• the cylindrical valve seat body In the downstream end of the valve housing 1 facing away from the core 12, the cylindrical valve seat body is in the longitudinal opening 3 which is concentric to the longitudinal axis 2 of the valve 16 inserted.
• the circumference of the valve seat body 16 has a slightly smaller diameter than the longitudinal opening 3 of the valve housing 1.
• a bottom part 20 of a z. B. cup-shaped spray plate 21 is located with its upper end face 19 on a lower end face 17 of
• Valve seat body 16 and is concentrically and firmly connected to it by means of a first weld 31.
• the bottom part 20 of the spray hole disk 21 has at least one spray hole 25, for example four spray holes 25 formed by erosion or stamping.
• valve seat part consisting of valve seat body 16 and cup-shaped spray orifice plate 21 into the longitudinal opening 3 determines the presetting of the stroke
• Valve needle 5 since the one end position of the valve needle 5 is fixed when the solenoid 10 is not energized by the valve closing body 7 resting on a conical valve seat surface 29 of the valve seat body 16.
• the other end position of the valve needle 5 is determined when the solenoid 10 is excited, for example by the armature 11 resting on the core 12.
• the path between these two end positions of the valve needle 5 thus represents the stroke.
• the holding edge 26 of the spray perforated disk 21 is tightly and firmly connected to the wall of the longitudinal opening 3.
• a circumferential second weld seam 30 is provided between the end 27 of the holding edge 26 and the wall of the longitudinal opening 3.
• valve seat body 16 and the spray orifice plate 21 and of the spray orifice plate 21 and the valve housing 1 is required so that the fuel does not pass between the longitudinal opening 3 of the valve housing 1 and the circumference of the valve seat body 16 to the spraying holes 25 or between the longitudinal opening 3 of the valve housing 1 and the
• Holding edge 26 of the cup-shaped spray perforated disk 21 can flow directly into an air intake line of the internal combustion engine.
• valve closing body 7 interacts with the valve seat surface 29 of the valve seat body 16 which tapers in the shape of a truncated cone and is formed in the axial direction between the guide opening 15 and an outflow opening 32 in the lower end face 17 of the valve seat body 16.
• Valve seat body 16, facing solenoid 10 has a valve seat body opening 34 which has a larger diameter than the diameter of guide opening 15 of valve seat body 16.
• the diameter of the guide opening 15 is designed such that the spherical valve closing body 7 projects through the guide opening 15 outside of its flattened portions 8 with a small radial distance.
• Spray plate 21 is bent out of the plane of the bottom part 20, for example in the downstream direction, ie in the direction pointing away from the valve closing body 7, so that a bulge 36 results in the central region.
• a collecting space 37 is formed, into which the fuel first reaches when the valve closing body 7 is lifted from the valve seat surface 29, before it is metered through the spray holes 25 and into the air intake line of the internal combustion engine is hosed.
• the precise stroke setting for the valve closing body 7 is carried out by bending the spray perforated disk 21 between the weld seams 30, 31 in the axial direction.
• a circumferential recess 40 is provided in the valve seat surface 29, which merges into the valve seat surface 29 upstream at a first circular edge 41 and downstream at a second circular edge 42.
• the spherical valve closing body 7 lies sealingly on the first circular edge 41 and on the second circular edge 42.
• the first circular edge 41 and the second circular edge 42 lie symmetrically to a fictitious contact circle 44 on the valve seat surface 29, on which the valve closing body 7 would rest against a valve seat surface 29 without a recess.
• the cross section of the depression can be triangular, semicircular, oval or the like, for example.
• the depression 40 is produced by machining or by forming in the valve seat surface 29.
• the valve seat body 16 is then hardened. After hardening, the circular edges 41, 42 are spherical in diameter
• Valve closing body 7 corresponding ball machined by lapping or honing so that the edges have a width of about 5 to 100 microns.

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)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7831809

Family Applications (1)

Country Status (8)

Families Citing this family (3)

Citations (5)

• 1997
  • 1997-06-07 DE DE19724091A patent/DE19724091A1/de not_active Withdrawn
• 1998
  • 1998-02-21 BR BR9806041A patent/BR9806041A/pt not_active Application Discontinuation
  • 1998-02-21 CN CN98800778A patent/CN1228138A/zh active Pending
  • 1998-02-21 KR KR1019997000979A patent/KR20000068066A/ko not_active Application Discontinuation
  • 1998-02-21 AU AU69176/98A patent/AU6917698A/en not_active Abandoned
  • 1998-02-21 JP JP11501237A patent/JP2000517023A/ja active Pending
  • 1998-02-21 WO PCT/DE1998/000529 patent/WO1998057058A1/de not_active Application Discontinuation
  • 1998-02-21 EP EP98914802A patent/EP0917622A1/de not_active Withdrawn

Patent Citations (5)

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