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
  • 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
  • F02M61/04—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
  • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
  • F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices
• • 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
• • 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

Definitions

• the invention relates to a fuel injector according to the type of the main claim.
• Fuel injectors in which the fuel is supplied to the sealing seat inside the valve closing body are, for. B. from DE 40 18 256 AI known. They have a valve closing body which is connected to the armature of the electromagnetically actuated injection valve and which is held by a spring in sealing contact with a seat surface which is arranged in a valve seat body.
• the valve closing body has a central recess, which is connected to a recess of the armature.
• the amount of fuel to be sprayed is measured via the cross section of the swirl channels, which are designed as bores.
• a fuel injector is also known, in which the flow guide is laid inside a hollow valve needle.
• the valve needle has a blind hole as the central recess, at the downstream end of which the swirl channels are arranged.
• the metering of the amount of fuel to be sprayed off again takes place via the cross section of the swirl channels, which can have a tangential component for generating a swirl.
• the fuel emerging from the swirl channels when the fuel injection valve is open has a peripheral speed and is sprayed onto a conical jacket.
• a disadvantage of both fuel injection valves specified is the design of the swirl channels as bores, as a result of which a subsequent correction with respect to the metered quantity of fuel is not possible.
• precise drilling of the holes is necessary, which increases the manufacturing costs.
• a check of the cross-sectional area of the swirl ducts is also necessary in order to be able to ensure that the quantity of fuel to be sprayed off corresponds to the specification when the fuel injector is fully assembled.
• the fuel injector according to the invention has the advantage that the swirl channels are introduced as slots in the valve closing body. As a result, the additional central supply of fuel inside the valve closing body can be dispensed with. Furthermore, after the valve needle has been welded to the valve closing body, a correction of the set metered quantity of fuel is possible.
• the free flow cross section can be varied by plastically deforming the weld seam. The resulting lower reject rate lowers manufacturing costs.
• Figure 1 is a schematic partial section through an embodiment of a fuel injector according to the invention.
• Fig. 2 is a schematic partial section in section II of Fig. 1 by the embodiment of a fuel injector according to the invention and
• the fuel injector 1 is in the form of a fuel injector 1 for fuel injection systems of mixture-compressing, spark-ignited
• the fuel injection valve 1 is particularly 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, which is hollow at least at its downstream end. At least one opening 39 is made in the wall of the valve needle 3, which is sleeve-shaped in this area, so that the cavity of the valve needle 3 can fill with fuel. At the downstream end, the valve needle 3 is connected at a connecting line 43, preferably by a weld 41, to a spherical valve closing body 4, which cooperates with a valve seat surface 6 arranged on a valve seat body 5 to form a sealing seat.
• fuel injector 1 is an electromagnetically actuated fuel injector 1, which has a spray opening 7.
• the nozzle body 2 is sealed by a seal 8 against an outer housing 9 of a solenoid 10.
• the magnet coil 10 is encapsulated in a coil housing 11 and wound on a coil carrier 12, which bears against an inner pole 13 of the magnet coil 10.
• the inner pole 13 and the housing 9 are separated from one another by a gap 26 and are supported on one Connecting component 29 from.
• the magnet coil 10 is excited via a line 19 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 disk-shaped valve needle guide 14, which is arranged downstream of the armature 20.
• a disk-shaped valve needle guide 14 For adjusting the stroke, one of the valve needle guide 14 paired adjusting disk 15 is used.
• the armature 20 is non-positively connected to the valve needle 3 via a flange 21, for. B. on a weld.
• a restoring spring 23 is supported on the flange 21, which, in the present design of the fuel injector 1, is pretensioned at its upstream end by a sleeve 24 pressed into the inner pole 13.
• Fuel channels 30a, 30b run in the valve needle guide 14 and in the armature 20.
• the fuel is supplied via a central fuel supply 16 and filtered by a filter element 25. Via the openings 39, the fuel is guided into the inner volume 42 of the valve needle 3 to the swirl channels 36.
• the fuel injector 1 is sealed by a seal 28 against a distribution line, not shown.
• the fuel injector 1 When the solenoid 10 is not energized, the fuel injector 1 is in the idle state and the armature 20 is acted on by the return spring 23 against the stroke direction via the flange 21 on the valve needle 3 in such a way that the valve closing body 4 is held in sealing contact with the valve seat surface 6 the valve closing body 4 is in its downstream stroke-limiting end position. If the magnet coil 10 is excited, it builds up a magnetic field which moves the armature 20 against the spring force of the return spring 23 in the stroke direction. The armature 20 takes the flange 21, which is welded to the valve needle 3, and thus the Valve needle 3 also in the stroke direction.
• the valve closing body 4, which is operatively connected to the valve needle 3, lifts off from the valve seat surface 6, and the fuel flows through the swirl channels 36 into a swirl chamber 37, from where it reaches the spray opening 7 and is sprayed onto a conical jacket.
• Fig. 2 shows the swirl-generating assembly of the embodiment of the invention
• valve needle 3 which is of sleeve-shaped design at least in its downstream area, is welded to the connecting line 43 by means of a weld seam 41 with a preferably spherical valve closing body 4.
• the valve closing body 4 is guided axially through a recess 38 which is introduced into the valve seat body 5.
• the swirl channels 36 are e.g. B. through a grinding wheel as slots 44 with a part-circular contour, which are open to the spherical surface of the valve closing body 4, introduced into the valve closing body 4.
• the connecting line 43 of the valve needle 3 with the valve closing body 4 cuts the slot-shaped swirl channels 36 which have been introduced.
• the slots 44 are divided into an opening part and an opening part.
• the inlet opening 36a thus formed is arranged in the inner volume 42 of the sleeve-shaped valve needle 3, the outlet opening 36b, on the other hand, is arranged upstream of the sealing seat and preferably opens into a swirl chamber 37 Applied peripheral speed, which leads to better atomization of the sprayed fuel.
• the fuel located in the inner volume 42 of the sleeve-shaped part of the valve needle 3 flows through the inlet opening 36a into the swirl duct 36.
• the distance D can be varied, which leads to a change in the rectangular area F to be flowed through, and thus ultimately to a change in the amount of fuel to be sprayed off.
• the connection of valve closing body 4 and valve needle 3 are plastically deformed. This can also take place in the fuel injector 1 which is already fully assembled.
• a material-locking method such as welding is preferably used as the connection technique.
• Fig. 3 shows a section through the sleeve-shaped valve needle 3 and the valve closing body 4 of an embodiment according to the invention.
• four swirl channels 36 are arranged uniformly in the valve closing body 4 and have identical cross sections.
• the swirl channels 36 can differ both with regard to the position with respect to the valve closing body and with regard to the cross section.

Landscapes

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

Applications Claiming Priority (3)

Publications (1)

Family

ID=7660737

Family Applications (1)

Country Status (5)

Families Citing this family (4)

Family Cites Families (5)

• 2000
  • 2000-10-23 DE DE2000152486 patent/DE10052486A1/de not_active Withdrawn
• 2001
  • 2001-10-23 EP EP01988821A patent/EP1330602A1/de not_active Withdrawn
  • 2001-10-23 CN CN 01805500 patent/CN1404551A/zh active Pending
  • 2001-10-23 WO PCT/DE2001/003977 patent/WO2002035083A1/de not_active Application Discontinuation
  • 2001-10-23 JP JP2002538039A patent/JP2004512459A/ja active Pending

Non-Patent Citations (1)

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