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
  • 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
  • F02M51/0685—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 and the valve being allowed to move relatively to each other or not being attached to each other
• • 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
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
  • F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means
• • 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
  • F02M51/0614—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature
• • 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
  • F02M61/16—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

Definitions

• the invention relates to a fuel injector according to the preamble of the main claim.
• a fuel injector is already known from US Pat. No. 4,766,405, which has a valve closing body connected to a valve needle, which cooperates with a valve seat surface formed on a valve seat body to form a sealing seat.
• a fuel injector is provided with a solenoid which interacts with an armature which is non-positively connected to the valve needle.
• an additional mass is provided in a cylindrical shape, which is connected to the armature via an elastomer layer.
• a disadvantage is the complex design with a. additional component.
• the large-area elastomer ring is also unfavorable for the course of the magnetic field and makes it difficult to close the field lines and thus to achieve high tightening forces during the opening movement of the fuel injector.
• a further embodiment of a fuel injector is known, is provided in the damping and debouncing around the anchor and the valve needle, a further cylindrical mass • which is clamped movably supported by two elastomer rings in position and held. When the valve needle strikes the sealing seat, this second mass can move relative to the armature and valve needle and prevent the valve needle from bouncing.
• the disadvantage of the described embodiment is the additional effort and space requirement.
• the armature itself is not decoupled, so its impulse increases the tendency for the valve needle to bounce.
• the fuel injector according to the invention with the characterizing features of the main claim has the advantage that a damping element dampens the armature and the valve needle radially against one another by pushing a hollow cylindrical elastomer part onto the valve needle and pushing the two components together into a recess in the armature. This effectively dampens both needle and anchor bouncers.
• the surfaces of the damping element are advantageously vulcanized in order to produce better adhesion between the damping element made of elastomer and the metallic components of the valve needle and armature.
• Fig. 1 shows a schematic section through an embodiment of a fuel injector designed according to the invention in a
• FIG. 2 shows a schematic longitudinal section through the fuel injection valve according to the invention shown in FIG. 1 in area II in FIG. 1.
• FIG. 1 of a fuel injection valve 1 designed according to the invention is in the form of a fuel injection valve for fuel injection systems of mixture-compressing, spark-ignition internal combustion engines.
• 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.
• the valve needle 3 is operatively connected to the 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 a fuel injector 1 that opens inward and has a spray opening 7.
• the nozzle body 2 is sealed by a seal 8 against the outer pole 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 outer pole 9 are separated from one another by a constriction 26 and connected to one another by a non-ferromagnetic connecting component 29.
• 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 valve needle guide 14, which is disc-shaped.
• a paired adjustment disk 15 On the other side of the shim 15 is the armature 20. This is connected via a first flange 21 force-locking to valve needle 3, which by a weld 22 to the' connected first flange 21 , A restoring spring 23 is supported on the first flange 21, 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, which is non-positively connected to the valve needle 3 by means of a weld 33 and serves as a lower armature stop.
• Fuel channels 30a to 30c run in the valve needle guide 14, in the armature 20 and on the valve seat body 5.
• the fuel is delivered through a central; Fuel supply 16 supplied and filtered by a filter element 25.
• the fuel injector 1 is sealed by a seal 28 against a fuel line, not shown.
• the fuel injection valve 1 has a damping element 32 in a recess 34 in the armature 20, "which is of hollow-cylindrical design and is penetrated by the valve needle 3.
• the damping element 32 can consist of an elastomer, for example made of rubber, which is vulcanized with it the anchor 20 on the one hand and the valve needle 3 on the other hand is in a non-positive connection that the axial movements of the above-mentioned components are damped against one another, as a result of which anchor stop bumpers can be avoided both when opening the upper and when closing the fuel injector 1 in the lower stroke position of the armature 20.
• the armature 20 In the idle state of the fuel injector 1, the armature 20 is acted upon by the return spring 23 against its stroke direction so that the valve closing body 4 is held in sealing contact with the valve seat 6.
• the magnetic coil 10 When the magnetic 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 stroke being predetermined by a working gap 27 which is in the rest position between the inner pole 12 and the armature 20.
• the armature 20 also takes the first flange 21, which is welded to the valve needle 3, in the stroke direction.
• the valve closing body 4 connected to the valve needle 3 lifts off the valve seat surface 6 and the fuel is sprayed through the spray opening 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, as a result of which the first flange 21, which is connected to the valve needle 3, moves counter to the stroke direction.
• the valve needle 3 is thereby moved in the same direction, as a result of which the valve closing body 4 rests on the valve seat surface 6 and the fuel injector 1 is closed.
• FIG. 2 shows an enlarged sectional view of an enlarged view of area II in FIG. 1.
• the armature 20 is shown with the damping element 32 and the Inlet end of valve needle 3. For the sake of clarity, the other components in this area have not been shown.
• the fuel injection valve 1 in its preferred embodiment has a damping element 32 which is arranged in an axial recess 34 of the armature 20.
• the damping egg 32 is hollow cylindrical and is preferably made of an elastomer material, for example rubber.
• the damping element 32 is provided with vulcanized layers 35a and 35b, which bear against the recess 34 of the armature 20 and the ⁇ valve needle ' 3 and by pressure and static friction forces for an elastic Ensure connection between armature 20 and valve needle 3.
• the damping element 32 is limited in its axial length only by the axial length of the recess 34 of the armature 20.
• the selection of the length and the wall thickness of the damping element 32 is mainly based on the aspects of manufacturing and assembly technology and the durability in continuous operation.
• the elastic connection allows the movements of the armature 20 and the valve needle 3 to one another to be effectively damped, as a result of which armature bumps on the first sleeve 21 when the fuel injector 1 is opened and on the second sleeve 31 when the fuel injector 1 is closed are avoided. Likewise, the movement of the valve needle 3 is damped, so that on the other hand, too. Valve needle bumpers in the sealing seat are not required. As a result, the dynamics of the 'fuel injector 1 is improved, so that shorter opening and closing times in conjunction with faster switching cycles and smaller and more accurate Zumeßmengen be realized.
• the invention is not limited to the illustrated embodiment and z. B. also suitable for outward opening fuel injection valves 1.

Landscapes

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

Applications Claiming Priority (3)

Publications (2)

Family

ID=7696035

Family Applications (1)

Country Status (7)

Families Citing this family (10)

Family Cites Families (7)

• 2001
  • 2001-08-20 DE DE10140795A patent/DE10140795A1/de not_active Withdrawn
• 2002
  • 2002-06-12 DE DE50206027T patent/DE50206027D1/de not_active Expired - Fee Related
  • 2002-06-12 EP EP02747214A patent/EP1425508B1/fr not_active Expired - Lifetime
  • 2002-06-12 AT AT02747214T patent/ATE319928T1/de not_active IP Right Cessation
  • 2002-06-12 KR KR10-2004-7002375A patent/KR20040027900A/ko not_active Application Discontinuation
  • 2002-06-12 JP JP2003523822A patent/JP2005500471A/ja active Pending
  • 2002-06-12 US US10/399,369 patent/US6869034B2/en not_active Expired - Fee Related
  • 2002-06-12 WO PCT/DE2002/002148 patent/WO2003018994A1/fr active IP Right Grant

Non-Patent Citations (1)

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