EP0812389B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP0812389B1
EP0812389B1 EP96924774A EP96924774A EP0812389B1 EP 0812389 B1 EP0812389 B1 EP 0812389B1 EP 96924774 A EP96924774 A EP 96924774A EP 96924774 A EP96924774 A EP 96924774A EP 0812389 B1 EP0812389 B1 EP 0812389B1
Authority
EP
European Patent Office
Prior art keywords
sleeve
valve
fuel injection
injection valve
seat body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96924774A
Other languages
German (de)
French (fr)
Other versions
EP0812389A1 (en
Inventor
Clemens Willke
Ferdinand Reiter
Willi Frank
Rudolf Kalb
Gerfried Hirt
Assadollah Awarzamani
Thomas Keil
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0812389A1 publication Critical patent/EP0812389A1/en
Application granted granted Critical
Publication of EP0812389B1 publication Critical patent/EP0812389B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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
    • F02M51/0675—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 valve body having cylindrical guiding or metering portions, e.g. with fuel passages
    • F02M51/0678—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 valve body having cylindrical guiding or metering portions, e.g. with fuel passages all portions having fuel passages, e.g. flats, grooves, diameter reductions
    • 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
    • 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
    • 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
    • Y10S239/90—Electromagnetically actuated fuel injector having ball and seat type valve

Definitions

  • the invention is based on a fuel injector according to the genus of the main claim.
  • a fuel injector known, among other things, a non-magnetic sleeve as a connecting part between a core and has a valve seat body. With her two the sleeve is fixed to the core and to the axial ends Valve seat body connected. The sleeve runs over hers total axial length with a constant outside diameter and a constant inner diameter and has correspondingly the same size at both ends Inlet openings.
  • the core and the valve seat body are formed with such an outer diameter that they in extend the sleeve at both ends so that the Sleeve the two components core and valve seat body in completely surrounds these protruding areas.
  • Valve needle with an anchor that is guided through the sleeve becomes.
  • the fixed connections of the sleeve to the core and the Valve seat bodies are e.g. B. achieved by welding, so as is also known from DE-OS 43 10 819.
  • DE-OS 43 10 819 e.g. B. achieved by welding, so as is also known from DE-OS 43 10 819.
  • a thin-walled, non-magnetic sleeve as Connection part between core and valve seat body one Fuel injector used. From the constructive Design ago this sleeve largely corresponds to the the sleeve known from US Pat. No. 4,946,107.
  • tubular sleeves can be the volume and weight of fuel injectors.
  • the fuel injector according to the invention with the characteristic features of the main claim has the Advantage that in a simple and inexpensive way a further volume and weight reduction of the Fuel injector is possible and a larger one Number of functions with only one sleeve-shaped component is achievable. In addition to the low manufacturing costs a simplification of the Assembly of the fuel injector by comparative few manufacturing steps. According to the invention Advantages achieved in that a thin-walled non-magnetic sleeve as a connecting part between one Core and a valve seat body in the fuel injector is used, which also holding, carrier or Recording functions fulfilled.
  • the sleeve has on her one axial end one perpendicular to the axial extent the sleeve extending bottom section through which one optimal and secure fastening of the valve seat body guaranteed and the stability of the sleeve is increased.
  • volume and weight reduction also helps in that the sleeve extends over more than half the axial length extends of the fuel injector and thus even the Can take over the function of a fuel inlet connector.
  • valve seat surface Press the valve seat body into the sleeve, with the Bottom section of the sleeve there is a contact surface, through which the valve seat body cannot slip.
  • a particular advantage is that the bottom section the sleeve can be designed so that the fuel metering Spray openings are provided in it. This is special inexpensive, because on one component (spray perforated disc) and a related connection point waived can be.
  • a big advantage is that for completely different valve types due to the arrangement of the sleeve Valve needles or anchors of the same shape can be used.
  • Embodiments of the invention are in the drawing shown in simplified form and in the following Description explained in more detail.
  • 1 shows a first Embodiment of a fuel injector
  • figure 2 shows an exemplary embodiment of a sleeve according to the invention
  • Figure 3 shows a first embodiment of a downstream End of the sleeve with built-in valve seat body
  • Figure 4 a first embodiment of an injection valve installable valve needle
  • Figure 5 a second Embodiment of a fuel injector
  • figure 6 shows a second exemplary embodiment of a downstream one End of the sleeve with built-in valve seat body
  • Figure 7 a third embodiment of a Fuel injector
  • Figure 8 is a fourth Embodiment of a fuel injector in the form a side feed injector
  • Figure 9 a second Embodiment of a built in an injection valve Valve needle.
  • Embodiment shown electromagnetically actuatable valve in the form of an injection valve for Fuel injection systems from mixture-compressing, spark-ignited internal combustion engines has one of one Solenoid 1 surrounded, as a fuel inlet port serving tubular core 2.
  • a bobbin 3 takes one Winding the solenoid 1 on and allows in Connection with a constant outer diameter having core 2 a particularly compact and short Structure of the injection valve in the area of the solenoid coil 1.
  • the magnet coil 1 is with its coil former 3 for example in a pot-shaped magnet housing 5 embedded, d. H. it is from the magnet housing 5 in Circumferentially and completely surrounded downwards.
  • An in the extruded magnet housing 5 insertable cover element 6 covers the magnetic coil 1 upwards and thus for the complete wrapping of the magnetic coil 1 and serves to close the magnetic circuit.
  • the magnet housing 5 with the Solenoid coil 1 always dry. An additional Sealing is not necessary.
  • a lower core end 9 of the core 2 is concentric a valve longitudinal axis 10 tightly as a connecting part serving tubular and thin-walled sleeve 12, for example by welding, connected and surrounding with an upper sleeve section 14, the core end 9 partially axially.
  • the coil former 3 overlaps the sleeve section 14 the sleeve 12 at least partially axially.
  • the coil former 3 namely has one over its entire axial extent larger inner diameter than the diameter of the sleeve 12 in its upper sleeve section 14.
  • the tubular sleeve 12 extends from, for example, non-magnetic steel downstream with a lower sleeve section 18 up to one forming the downstream end of the sleeve 12 Bottom portion 20 which is perpendicular to the axial extent the sleeve 12 extends.
  • the sleeve 12 is thus over its entire axial length tubular, in its entirety together with the Bottom section 20 but cup-shaped.
  • the sleeve forms 12 over its entire axial extent to Bottom section 20 largely with a through opening 21 constant diameter that is concentric to that Longitudinal valve axis 10 extends.
  • With her lower one Sleeve section 18 surrounds the sleeve 12 an anchor 24 and further downstream a valve seat body 25.
  • One with the Valve seat body 25, for example, firmly connected Spray plate 26 is from the sleeve 12 in Circumferential direction of the sleeve portion 18 and in the radial Direction enclosed by the bottom portion 20.
  • the sleeve 12 is thus not just a connecting part, but fulfills it also holding, carrier or recording functions, in particular for the valve seat body 25 so that the sleeve 12 really is also valve seat support.
  • B. spherical valve closing body 30, on the circumference, for example, five flattenings 31 to Flowing past the fuel to be sprayed provided are connected, for example by welding.
  • the injection valve is actuated in a known manner Way z. B. electromagnetic.
  • Way z. B. electromagnetic For the axial movement of the Valve needle 28 and thus to open against the spring force a return spring 33 or closing the injection valve serves the electromagnetic circuit with the magnetic coil 1, the core 2, the magnet housing 5 and the armature 24.
  • the armature 24 is with the end facing away from the valve closing body 30 the valve needle 28 z. B. connected by a weld and aligned to core 2.
  • To manage the Valve closing body 30 during the axial movement of the Valve needle 28 with the armature 24 along the longitudinal axis of the valve 10 serves a guide opening 34 of the valve seat body 25.
  • the armature 24 during the axial movement in the Sleeve 12 out.
  • the cover element 6 is, for. B. a stamped part after the Assembly of the magnet coil 1 in the magnet housing 5 by z. B. a crimp connection 36 held on the magnet housing 5 becomes.
  • the spherical valve closing body 30 acts with one tapered in the direction of flow Valve seat surface 35 of the valve seat body 25 together, the in the axial direction downstream of the guide opening 34 is trained.
  • the valve seat body 25 On its valve closing body 30 facing away end is the valve seat body 25 with the for example, a spray-perforated disk with a bowl-shaped design 26 concentric and firm, for example by a Weld seam connected, as shown in Figure 3.
  • adjusting sleeve 45 In a concentric to the valve longitudinal axis 10 stepped flow bore 43 of the core 2, that of the feed the fuel towards the valve seat, especially the Serves valve seat surface 35 is an adjusting sleeve 45th inserted.
  • the adjusting sleeve 45 is used to adjust the Spring preload on the adjuster sleeve 45 Return spring 33, which in turn with her opposite side is supported on the valve needle 28.
  • the insertion depth of the valve seat body 25 with the cup-shaped spray hole disk 26 is, inter alia, critical for the stroke of the valve needle 28. It becomes essentially due to the spatial position of the bottom section 20 of the sleeve 12 already specified.
  • the one end position is the Valve needle 28 when the solenoid 1 is not energized by the Contact of the valve closing body 30 on the valve seat surface 35 of the valve seat body 25 set while the other end position of the valve needle 28 when excited Magnetic coil 1 by the armature 24 resting on the core end 9 results.
  • a Stop plate 47 may be provided, the z. B. from non-magnetic, wear-resistant, hard-rolled material consists.
  • a coating of the surfaces (e.g. Chrome plating) of core 2 and anchor 24 in their Stop areas can then be avoided.
  • the Stop areas on the core 2 and anchor 24 are by Roll smoothing work hardened and compacted. Also done the stroke setting by moving the axially with small excess pressed core 2 in the upper Sleeve section 14 of the sleeve 12.
  • the core 2 is in the according to the desired position then firmly with the sleeve 12 connected, wherein a laser welding on the circumference of the sleeve 12th makes sense.
  • the interference of the press fit can also be chosen large enough so that the occurring Forces can be absorbed and complete Tightness is guaranteed, resulting in a weld can be dispensed with.
  • a fuel filter 52 projects into the flow bore 43 of the Kerns 2 at its inlet end and ensures that Filtering out such fuel components, the due to their size in the injector clogging or Can cause damage.
  • the finished one Injector is largely with one Plastic encapsulation 55 enclosed, which is from the core 2nd starting in the axial direction via the solenoid 1 to Sleeve 12 and even downstream over the bottom portion 20 the sleeve 12 also extends to this Plastic extrusion 55 an injected electrical Connector 56 belongs. About the electrical Connector 56 is the electrical contact Solenoid 1 and thus their excitation.
  • FIG. 2 is the sleeve 12 of the one in FIG. 1 illustrated first embodiment as a single Component shown on a different scale.
  • the thin-walled sleeve 12 is, for example, by deep drawing been formed, using as a material non-magnetic material, e.g. B. a rust-resistant CrNi steel is used.
  • the sleeve In its bottom section 20 points the sleeve has a central outlet opening 58, the one has such a large diameter that the over Spray openings 39 of the spray orifice plate 26 are sprayed Fuel can leave the injector unhindered. Should the sleeve 12 in a so-called side feed injection valve are used, as shown in FIG.
  • top feed injector has a sleeve 12 that does not Has inflow openings 59 because the fuel along the Longitudinal valve axis 10 axially via the flow bore 43 in the sleeve 12 enters.
  • the sleeve 12 has at that Bottom section 20 opposite axial end for example, a slightly radially outward curve Peripheral edge 60.
  • the peripheral edge 60 arises from the Cutting off the material overflow during deep drawing.
  • the pre-assembled assembly consisting of magnetic coil 1, coil body 3, Magnet housing 5 and cover element 6 is on the outer
  • the circumference of the sleeve 12 is pushed axially, with the Circumferential edge 60 may be limited and in assembled state, a clamping of the cover element 6 is possible.
  • the bobbin 3, the magnet housing 5 and that Cover element 6 all have central through openings through which the sleeve 12 then extends.
  • FIG. 3 again shows the lower sleeve section 18 and the bottom portion 20 together with a built-in one Valve seat body 25 and an attached thereto Spray hole disk 26 shown in a modified scale.
  • the cup-shaped spray plate 26 has in addition to one Bottom part 38 to which the valve seat body 25 is attached and in which at least one, for example four, is passed through Eroding or punching molded injection orifices 39 run, a revolving upstream Retaining edge 40.
  • Retaining edge 40 is conical upstream bent outwards, so that this at the by the Through opening 21 certain inner wall of the sleeve 12th is present, with a radial pressure.
  • the Valve seat body 25 is cold pressed into the sleeve 12 and not welded.
  • the press-in process takes place, for example in the through hole 21 of the sleeve 12 until the z. B. attached by welding to the valve seat body 25 Spray plate 26 with its bottom part 38 on Bottom portion 20 of the sleeve 12 abuts.
  • the holding edge 40 of the Spray plate 26 has a slight at its end larger diameter than the diameter of the Through opening 21 of the sleeve 12 so that the holding edge 40th at its end presses against the sleeve 12, whereby next to the Pressing the valve seat body 25 into another fuse against slipping of the valve seat body 25 is given.
  • valve needle 28 is in the injection valve too another embodiment of a valve needle 28 is conceivable, which is shown in Figure 4.
  • the valve needle 28 is at this embodiment as an elongated solid component educated. It is no longer possible to use the fuel within the valve needle 28 towards Supply valve seat 35. That is why already in Armature 24 outlet holes 62 'are provided through which coming from an inner opening 63 of the armature 24 Fuel can flow to then outside the valve needle 28 further in the through opening 21 of the sleeve 12 to come downstream.
  • the anchor 24 is for example staged, with an upper upstream Anchor section 64 has a larger diameter than a lower downstream anchor section 65.
  • the in Inside the armature 24 extending opening 63 has in lower anchor section 65 a smaller cross section than in upper anchor portion 64.
  • a firm one Connection of armature 24 and valve needle 28 is such. B. thereby achieved that the armature 24 on the upstream End 66 of the valve needle 28 is pressed, since between the Valve needle 28 at least at its end 66 to be pressed in and the opening 63 is an interference fit.
  • the Valve needle 28 are, for example, some rotating for example, rolled grooves 67 are provided for a Notching the anchor 24 after pressing on the Serve valve needle 28.
  • valve needle 28 protrudes with its end 66 after the Press in only so far into the opening 63 that the Exit bores 62 'remain completely free.
  • this is also an alternative as a joining process Laser welding possible in a known manner (see Figure 1).
  • the fixed connection of valve needle 28 and spherical Valve closing body 30 is, for. B. by means of laser welding achieved, with the valve needle 28 at its downstream, end facing away from the armature 24, has dome-shaped mounting flange 68.
  • the Mounting flange 68 is according to the radius of the spherical valve closing body 30 is formed.
  • the fuel injector shown in Figure 5 corresponds in its basic structure to that shown in FIG. 1 Injector. In the following, therefore, only the differently designed components or assemblies are explained.
  • the compared to that shown in Figure 1 Embodiment constant or equivalent Parts are in all other embodiments by marked with the same reference numerals.
  • Magnet housing 5 is the magnet coil 1 of at least one, For example, trained as a bracket and as Surrounding ferromagnetic element serving guide element 70.
  • the guide element 70 surrounds the magnet coil 1 in Circumferential direction at least partially and lies with his one end to the core 2 and its other end to the Sleeve 12 z. B. in the region of the upper sleeve section 14 and is with this z. B. by welding, soldering or gluing connectable.
  • the stepped, thin-walled, non-magnetic sleeve 12 is designed so that the upper, the armature 24 leading sleeve section 14 a little has a larger diameter than the lower sleeve section 18, the through opening 21 of the same degree Sleeve 12 reduced in the downstream direction.
  • the bottom section 20 of the sleeve 12 takes over the functions an orifice plate, so that the orifice plate 26 can be omitted.
  • the bottom portion 20 is similar to that known orifice plates at least one, for example four spray orifices 39 on the z. B. by punching or Eroding are introduced.
  • FIG. 6 based on FIG Valve seat body 25 and the sleeve 12 in the area of Bottom section 20 is shown enlarged.
  • the Bottom section 20 is like a conventional spray perforated disk trained and thus has no outlet opening 58, but only the spray openings that measure the fuel 39.
  • the sleeve 12 now also fulfills carrier functions Metering and spraying function.
  • the valve seat body 25 can either with the sleeve 12 in the area of the bottom section 20 and / or in the region of the lower sleeve section 18 welded or pressed tightly into the sleeve 12.
  • one component Spray plate 26
  • at least one Connection point can be dispensed with.
  • receives the sleeve 12 with this bottom section 20 a higher one Rigidity, which reduces the risk of damage when handling the Valve components reduced.
  • the assembly of the injection valve is very simple, for. B. so that first the magnet coil 1, the magnet housing 5 and the cover element 6 (or alternatively at least one Guide 70) are mounted on the sleeve 12, then the Injection molding with plastic 55 takes place, hereinafter the Valve seat body 25 is pressed into the sleeve 12 and the Valve needle 28 are inserted with armature 24 and then the Core 2 is pressed in until the nominal stroke is reached is. All subsequent assembly steps are already well known.
  • the sleeve 12 is, for. B. about their axial Length is carried out in two steps, the cross-section being different of the through hole 21 in the downstream direction slightly reduced.
  • the z. B. in the stop area of Armature 24 and core 2 and provided above the core 2 Steps make assembly easier.
  • FIGs 8 and 9 are intended primarily to illustrate that a sleeve 12 according to the invention also in completely different Valve types, e.g. B. in so-called side feed injectors, can be used.
  • a sleeve 12 in so-called side feed injectors
  • the one shown in Figure 9 Valve needle 28 with a central Valve seat body bore 75 of valve seat body 25 protruding spigot 76 can be simplified compared to known valve needles of comparable injection valves be formed by only one guide portion 77 is provided.
  • Such valve needles usually have two guide sections 77.
  • the valve needle 28 is through the anchor 24 also guided in the sleeve 12.
  • the sleeve 12 can be used in Side-feed injection valves have at least one inflow opening 59 have, via which the fuel supply in the direction of Valve seat 35 takes place.

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

Abstract

The invention relates to a fuel injection valve for fuel injection systems of internal combustion engines in which there is an extended, axial, thin-walled, non-magnetic sleeve (12). At the downstream end said sleeve (12) has a base section (20) running substantially perpendicularly to the otherwise axial extent of the sleeve (12) along a longitudinal valve axis (10). A valve needle (28), firmly secured to an armature (24) and a valve closer (30), can move axially in a through aperture (21) in the sleeve (12). The valve closer (30) operates together with a valve seat (35) on a valve seat body (25), where the valve seat body (25) is pressed into the sleeve (12) and, for instance, thus bears on the base section (20) of the sleeve (12). The sleeve (12), in the form of a deep-drawn sheet-metal component, extends axially over more than half the axial length of the fuel injection valve. The fuel injection valve is particularly suitable for use in fuel injection systems of mixture-compressing spark-ignition internal combustion engines.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Hauptanspruchs. Aus der US-PS 4,946,107 ist bereits ein elektromagnetisch betätigbares Brennstoffeinspritzventil bekannt, das unter anderem eine unmagnetische Hülse als Verbindungsteil zwischen einem Kern und einem Ventilsitzkörper aufweist. Mit ihren beiden axialen Enden ist die Hülse fest mit dem Kern und mit dem Ventilsitzkörper verbunden. Die Hülse verläuft über ihre gesamte axiale Länge mit einem konstanten Außendurchmesser und einem konstanten Innendurchmesser und besitzt entsprechend an ihren beiden Enden gleich große Eintrittsöffnungen. Der Kern und der Ventilsitzkörper sind mit einem solchen Außendurchmesser ausgebildet, daß sie in die Hülse an den beiden Enden hineinreichen, so daß die Hülse die beiden Bauteile Kern und Ventilsitzkörper in diesen hineinragenden Bereichen vollständig umgibt. Im Inneren der Hülse bewegt sich in axialer Richtung eine Ventilnadel mit einem Anker, der durch die Hülse geführt wird. Die festen Verbindungen der Hülse mit dem Kern und dem Ventilsitzkörper werden z. B. mittels Schweißen erzielt, so wie es auch aus der DE-OS 43 10 819 bekannt ist. Auch hier wird eine dünnwandige, unmagnetische Hülse als Verbindungsteil zwischen Kern und Ventilsitzkörper eines Brennstoffeinspritzventils verwendet. Von der konstruktiven Ausgestaltung her entspricht diese Hülse weitgehend der aus der US-PS 4,946,107 bekannten Hülse. Mit Hilfe der rohrförmigen Hülsen lassen sich das Volumen und das Gewicht der Brennstoffeinspritzventile reduzieren. The invention is based on a fuel injector according to the genus of the main claim. From U.S. Patent 4,946,107 is already an electromagnetically operated one Fuel injector known, among other things, a non-magnetic sleeve as a connecting part between a core and has a valve seat body. With her two the sleeve is fixed to the core and to the axial ends Valve seat body connected. The sleeve runs over hers total axial length with a constant outside diameter and a constant inner diameter and has correspondingly the same size at both ends Inlet openings. The core and the valve seat body are formed with such an outer diameter that they in extend the sleeve at both ends so that the Sleeve the two components core and valve seat body in completely surrounds these protruding areas. in the Inside the sleeve moves in the axial direction Valve needle with an anchor that is guided through the sleeve becomes. The fixed connections of the sleeve to the core and the Valve seat bodies are e.g. B. achieved by welding, so as is also known from DE-OS 43 10 819. Here too becomes a thin-walled, non-magnetic sleeve as Connection part between core and valve seat body one Fuel injector used. From the constructive Design ago this sleeve largely corresponds to the the sleeve known from US Pat. No. 4,946,107. With the help of tubular sleeves can be the volume and weight of fuel injectors.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat den Vorteil, daß auf einfache und kostengünstige Art und Weise eine weitere Volumen- und Gewichtsreduzierung des Brennstoffeinspritzventils möglich ist und eine größere Anzahl von Funktionen mit nur einem hülsenförmigen Bauteil erfüllbar ist. Neben den geringen Herstellungskosten ergibt sich außerdem in vorteilhafter Weise eine Vereinfachung der Montage des Brennstoffeinspritzventils durch vergleichsweise wenige Fertigungsschritte. Erfindungsgemäß werden diese Vorteile dadurch erreicht, daß eine dünnwandige, nichtmagnetische Hülse als Verbindungsteil zwischen einem Kern und einem Ventilsitzkörper im Brennstoffeinspritzventil verwendet ist, die außerdem Halte-, Träger- bzw. Aufnahmefunktionen erfüllt. Dabei weist die Hülse an ihrem einen axialen Ende einen senkrecht zur axialen Erstreckung der Hülse verlaufenden Bodenabschnitt auf, durch den eine optimale und sichere Befestigung des Ventilsitzkörpers gewährleistet und die Stabilität der Hülse erhöht ist. Zur Volumen- und Gewichtsreduzierung trägt vor allen Dingen auch bei, daß sich die Hülse über mehr als die halbe axiale Länge des Brennstoffeinspritzventils erstreckt und damit sogar die Funktion eines Brennstoffeinlaßstutzens übernehmen kann.The fuel injector according to the invention with the characteristic features of the main claim has the Advantage that in a simple and inexpensive way a further volume and weight reduction of the Fuel injector is possible and a larger one Number of functions with only one sleeve-shaped component is achievable. In addition to the low manufacturing costs a simplification of the Assembly of the fuel injector by comparative few manufacturing steps. According to the invention Advantages achieved in that a thin-walled non-magnetic sleeve as a connecting part between one Core and a valve seat body in the fuel injector is used, which also holding, carrier or Recording functions fulfilled. The sleeve has on her one axial end one perpendicular to the axial extent the sleeve extending bottom section through which one optimal and secure fastening of the valve seat body guaranteed and the stability of the sleeve is increased. to Above all, volume and weight reduction also helps in that the sleeve extends over more than half the axial length extends of the fuel injector and thus even the Can take over the function of a fuel inlet connector.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Brennstoffeinspritzventils möglich.By the measures listed in the subclaims advantageous further developments and improvements of the Main claim specified fuel injector possible.

Von Vorteil ist es, den eine Ventilsitzfläche aufweisenden Ventilsitzkörper in die Hülse einzupressen, wobei durch den Bodenabschnitt der Hülse eine Anlagefläche vorhanden ist, durch die der Ventilsitzkörper nicht verrutschen kann. It is advantageous to have a valve seat surface Press the valve seat body into the sleeve, with the Bottom section of the sleeve there is a contact surface, through which the valve seat body cannot slip.

Besonders vorteilhaft ist es, die Hülse mittels Blechtiefziehen herzustellen, da dieses Verfahren einfach und preiswert ist und trotzdem die geforderte Genauigkeit erreicht wird.It is particularly advantageous to use the sleeve Manufacture sheet metal deep drawing as this process is simple and is inexpensive and still the required accuracy is achieved.

Für sogenannte Side-Feed-Einspritzventile, die also teilweise quer durchströmt werden, ist es vorteilhaft, Bohrungen oder Öffnungen in der Hülsenwandung vorzusehen, um eine direkte Brennstoffversorgung der Abspritzöffnungen des Brennstoffeinspritzventils zu gewährleisten.For so-called side feed injectors, that is are partially traversed, it is advantageous To provide holes or openings in the sleeve wall to a direct fuel supply to the spray openings of the Ensure fuel injector.

Ein besonderer Vorteil besteht darin, daß der Bodenabschnitt der Hülse so ausbildbar ist, daß den Brennstoff zumessende Abspritzöffnungen in ihm vorgesehen sind. Dies ist besonders kostengünstig, da auf ein Bauteil (Spritzlochscheibe) und eine damit zusammenhängende Verbindungsstelle verzichtet werden kann.A particular advantage is that the bottom section the sleeve can be designed so that the fuel metering Spray openings are provided in it. This is special inexpensive, because on one component (spray perforated disc) and a related connection point waived can be.

Von Vorteil ist es außerdem, die Hülse so lang auszubilden, daß sie über die gesamte axiale Erstreckungslänge des Brennstoffeinspritzventils reicht. Damit übernimmt die Hülse auch die Funktion eines Brennstoffeinlaßstutzens. Des weiteren kann der Kern sehr einfach in die Hülse eingepreßt werden, womit auch auf einfache Art und Weise der Hub der Ventilnadel einstellbar ist. Außerdem ist bei dieser langen Hülsenanordnung das Dichtheitsproblem zum Ventilinnenraum hin beseitigt. Ein oberer Dichtring dichtet unmittelbar auf der Hülse ab.It is also advantageous to make the sleeve so long that that they over the entire axial extension of the Fuel injector is enough. So the sleeve takes over also the function of a fuel inlet connection. Of furthermore, the core can be pressed into the sleeve very simply with which the stroke of the Valve needle is adjustable. In addition, this long Sleeve arrangement the tightness problem to the valve interior eliminated. An upper sealing ring seals immediately the sleeve.

Ein großer Vorteil besteht darin, daß für völlig verschiedene Ventiltypen durch die Anordnung der Hülse Ventilnadeln bzw. Anker gleicher Gestalt einsetzbar sind.A big advantage is that for completely different valve types due to the arrangement of the sleeve Valve needles or anchors of the same shape can be used.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein erstes Ausführungsbeispiel eines Brennstoffeinspritzventils, Figur 2 ein Ausführungsbeispiel einer erfindungsgemäßen Hülse, Figur 3 ein erstes Ausführungsbeispiel eines stromabwärtigen Endes der Hülse mit eingebautem Ventilsitzkörper, Figur 4 ein erstes Ausführungsbeispiel einer in ein Einspritzventil einbaubaren Ventilnadel, Figur 5 ein zweites Ausführungsbeispiel eines Brennstoffeinspritzventils, Figur 6 ein zweites Ausführungsbeispiel eines stromabwärtigen Endes der Hülse mit eingebautem Ventilsitzkörper, Figur 7 ein drittes Ausführungsbeispiel eines Brennstoffeinspritzventils, Figur 8 ein viertes Ausführungsbeispiel eines Brennstoffeinspritzventils in Form eines Side-Feed-Einspritzventils und Figur 9 ein zweites Ausführungsbeispiel einer in ein Einspritzventil einbaubaren Ventilnadel.Embodiments of the invention are in the drawing shown in simplified form and in the following Description explained in more detail. 1 shows a first Embodiment of a fuel injector, figure 2 shows an exemplary embodiment of a sleeve according to the invention, Figure 3 shows a first embodiment of a downstream End of the sleeve with built-in valve seat body, Figure 4 a first embodiment of an injection valve installable valve needle, Figure 5 a second Embodiment of a fuel injector, figure 6 shows a second exemplary embodiment of a downstream one End of the sleeve with built-in valve seat body, Figure 7 a third embodiment of a Fuel injector, Figure 8 is a fourth Embodiment of a fuel injector in the form a side feed injector and Figure 9 a second Embodiment of a built in an injection valve Valve needle.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Das in der Figur 1 beispielsweise als erstes Ausführungsbeispiel dargestellte elektromagnetisch betätigbare Ventil in der Form eines Einspritzventils für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündeten Brennkraftmaschinen hat einen von einer Magnetspule 1 umgebenen, als Brennstoffeinlaßstutzen dienenden rohrförmigen Kern 2. Ein Spulenkörper 3 nimmt eine Bewicklung der Magnetspule 1 auf und ermöglicht in Verbindung mit dem einen konstanten Außendurchmesser aufweisenden Kern 2 einen besonders kompakten und kurzen Aufbau des Einspritzventils im Bereich der Magnetspule 1. Die Magnetspule 1 ist mit ihrem Spulenkörper 3 beispielsweise in einem topfförmigen Magnetgehäuse 5 eingebettet, d. h. sie ist von dem Magnetgehäuse 5 in Umfangsrichtung und nach unten vollständig umgeben. Ein in das fließgepreßte Magnetgehäuse 5 einsetzbares Deckelelement 6 sorgt für eine Abdeckung der Magnetspule 1 nach oben und somit für die vollständige Umhüllung der Magnetspule 1 und dient dem Schließen des magnetischen Kreises. Durch diese Bauweise in Topfform liegt das Magnetgehäuse 5 mit der Magnetspule 1 grundsätzlich trocken vor. Eine zusätzliche Abdichtung entfällt.First in FIG. 1, for example Embodiment shown electromagnetically actuatable valve in the form of an injection valve for Fuel injection systems from mixture-compressing, spark-ignited internal combustion engines has one of one Solenoid 1 surrounded, as a fuel inlet port serving tubular core 2. A bobbin 3 takes one Winding the solenoid 1 on and allows in Connection with a constant outer diameter having core 2 a particularly compact and short Structure of the injection valve in the area of the solenoid coil 1. The magnet coil 1 is with its coil former 3 for example in a pot-shaped magnet housing 5 embedded, d. H. it is from the magnet housing 5 in Circumferentially and completely surrounded downwards. An in the extruded magnet housing 5 insertable cover element 6 covers the magnetic coil 1 upwards and thus for the complete wrapping of the magnetic coil 1 and serves to close the magnetic circuit. Through this Construction in pot form is the magnet housing 5 with the Solenoid coil 1 always dry. An additional Sealing is not necessary.

Mit einem unteren Kernende 9 des Kerns 2 ist konzentrisch zu einer Ventillängsachse 10 dicht eine als Verbindungsteil dienende rohrförmige und dünnwandige Hülse 12, beispielsweise durch Schweißen, verbunden und umgibt dabei mit einem oberen Hülsenabschnitt 14 das Kernende 9 teilweise axial. Der Spulenkörper 3 übergreift den Hülsenabschnitt 14 der Hülse 12 zumindest teilweise axial. Der Spulenkörper 3 besitzt nämlich über seine gesamte axiale Erstreckung einen größeren Innendurchmesser als den Durchmesser der Hülse 12 in ihrem oberen Hülsenabschnitt 14. Die rohrförmige Hülse 12 aus beispielsweise nichtmagnetischem Stahl erstreckt sich stromabwärts mit einem unteren Hülsenabschnitt 18 bis zu einem den stromabwärtigen Abschluß der Hülse 12 bildenden Bodenabschnitt 20, der sich senkrecht zur axialen Ausdehnung der Hülse 12 erstreckt.With a lower core end 9 of the core 2 is concentric a valve longitudinal axis 10 tightly as a connecting part serving tubular and thin-walled sleeve 12, for example by welding, connected and surrounding with an upper sleeve section 14, the core end 9 partially axially. The coil former 3 overlaps the sleeve section 14 the sleeve 12 at least partially axially. The coil former 3 namely has one over its entire axial extent larger inner diameter than the diameter of the sleeve 12 in its upper sleeve section 14. The tubular sleeve 12 extends from, for example, non-magnetic steel downstream with a lower sleeve section 18 up to one forming the downstream end of the sleeve 12 Bottom portion 20 which is perpendicular to the axial extent the sleeve 12 extends.

Die Hülse 12 ist also über ihre gesamte axiale Länge rohrförmig ausgebildet, in ihrer Gesamtheit zusammen mit dem Bodenabschnitt 20 aber becherförmig. Dabei bildet die Hülse 12 über ihre gesamte axiale Ausdehnung bis zum Bodenabschnitt 20 eine Durchgangsöffnung 21 mit weitgehend konstantem Durchmesser, die konzentrisch zu der Ventillängsachse 10 verläuft. Mit ihrem unteren Hülsenabschnitt 18 umgibt die Hülse 12 einen Anker 24 und weiter stromabwärts einen Ventilsitzkörper 25. Eine mit dem Ventilsitzkörper 25 beispielsweise fest verbundene Spritzlochscheibe 26 wird von der Hülse 12 in Umfangsrichtung vom Hülsenabschnitt 18 und in radialer Richtung vom Bodenabschnitt 20 umschlossen. Die Hülse 12 ist somit nicht nur ein Verbindungsteil, sondern sie erfüllt auch Halte-, Träger- bzw. Aufnahmefunktionen, insbesondere für den Ventilsitzkörper 25, so daß die Hülse 12 wirklich auch Ventilsitzträger ist. In der Durchgangsöffnung 21 ist eine z. B. rohrförmige Ventilnadel 28 angeordnet, die an ihrem stromabwärtigen, der Spritzlochscheibe 26 zugewandten Ende 29 mit einem z. B. kugelförmigen Ventilschließkörper 30, an dessen Umfang beispielsweise fünf Abflachungen 31 zum Vorbeiströmen des abzuspritzenden Brennstoffs vorgesehen sind, beispielsweise durch Schweißen verbunden ist.The sleeve 12 is thus over its entire axial length tubular, in its entirety together with the Bottom section 20 but cup-shaped. The sleeve forms 12 over its entire axial extent to Bottom section 20 largely with a through opening 21 constant diameter that is concentric to that Longitudinal valve axis 10 extends. With her lower one Sleeve section 18 surrounds the sleeve 12 an anchor 24 and further downstream a valve seat body 25. One with the Valve seat body 25, for example, firmly connected Spray plate 26 is from the sleeve 12 in Circumferential direction of the sleeve portion 18 and in the radial Direction enclosed by the bottom portion 20. The sleeve 12 is thus not just a connecting part, but fulfills it also holding, carrier or recording functions, in particular for the valve seat body 25 so that the sleeve 12 really is also valve seat support. In the through opening 21 is a z. B. tubular valve needle 28 arranged on the its downstream, the spray orifice plate 26 End of 29 with a z. B. spherical valve closing body 30, on the circumference, for example, five flattenings 31 to Flowing past the fuel to be sprayed provided are connected, for example by welding.

Die Betätigung des Einspritzventils erfolgt in bekannter Weise z. B. elektromagnetisch. Zur axialen Bewegung der Ventilnadel 28 und damit zum Öffnen entgegen der Federkraft einer Rückstellfeder 33 bzw. Schließen des Einspritzventils dient der elektromagnetische Kreis mit der Magnetspule 1, dem Kern 2, dem Magnetgehäuse 5 und dem Anker 24. Der Anker 24 ist mit dem dem Ventilschließkörper 30 abgewandten Ende der Ventilnadel 28 z. B. durch eine Schweißnaht verbunden und auf den Kern 2 ausgerichtet. Zur Führung des Ventilschließkörpers 30 während der Axialbewegung der Ventilnadel 28 mit dem Anker 24 entlang der Ventillängsachse 10 dient eine Führungsöffnung 34 des Ventilsitzkörpers 25. Außerdem wird der Anker 24 während der Axialbewegung in der Hülse 12 geführt. Aus Kostengründen ist es von Vorteil, wenn das Magnetgehäuse 5 und der Anker 24 aus einem Fließpreßteil in einer Aufspannung auf Drehautomaten hergestellt werden. Das Deckelelement 6 ist z. B. ein Stanzteil, das nach der Montage der Magnetspule 1 im Magnetgehäuse 5 durch z. B. eine Bördelverbindung 36 am Magnetgehäuse 5 festgehalten wird.The injection valve is actuated in a known manner Way z. B. electromagnetic. For the axial movement of the Valve needle 28 and thus to open against the spring force a return spring 33 or closing the injection valve serves the electromagnetic circuit with the magnetic coil 1, the core 2, the magnet housing 5 and the armature 24. The armature 24 is with the end facing away from the valve closing body 30 the valve needle 28 z. B. connected by a weld and aligned to core 2. To manage the Valve closing body 30 during the axial movement of the Valve needle 28 with the armature 24 along the longitudinal axis of the valve 10 serves a guide opening 34 of the valve seat body 25. In addition, the armature 24 during the axial movement in the Sleeve 12 out. For cost reasons, it is advantageous if the magnet housing 5 and the armature 24 from an extrusion can be produced in one setting on automatic lathes. The cover element 6 is, for. B. a stamped part after the Assembly of the magnet coil 1 in the magnet housing 5 by z. B. a crimp connection 36 held on the magnet housing 5 becomes.

Der kugelförmige Ventilschließkörper 30 wirkt mit einer sich in Strömungsrichtung kegelstumpfförmig verjüngenden Ventilsitzfläche 35 des Ventilsitzkörpers 25 zusammen, die in axialer Richtung stromabwärts der Führungsöffnung 34 ausgebildet ist. An seiner dem Ventilschließkörper 30 abgewandten Stirnseite ist der Ventilsitzkörper 25 mit der beispielsweise schalenförmig ausgebildeten Spritzlochscheibe 26 konzentrisch und fest, beispielsweise durch eine Schweißnaht verbunden, wie es die Figur 3 zeigt.The spherical valve closing body 30 acts with one tapered in the direction of flow Valve seat surface 35 of the valve seat body 25 together, the in the axial direction downstream of the guide opening 34 is trained. On its valve closing body 30 facing away end is the valve seat body 25 with the for example, a spray-perforated disk with a bowl-shaped design 26 concentric and firm, for example by a Weld seam connected, as shown in Figure 3.

In eine konzentrisch zu der Ventillängsachse 10 verlaufende abgestufte Strömungsbohrung 43 des Kerns 2, die der Zufuhr des Brennstoffs in Richtung des Ventilsitzes, speziell der Ventilsitzfläche 35 dient, ist eine Einstellhülse 45 eingeschoben. Die Einstellhülse 45 dient zur Einstellung der Federvorspannung der an der Einstellhülse 45 anliegenden Rückstellfeder 33, die sich wiederum mit ihrer gegenüberliegenden Seite an der Ventilnadel 28 abstützt.In a concentric to the valve longitudinal axis 10 stepped flow bore 43 of the core 2, that of the feed the fuel towards the valve seat, especially the Serves valve seat surface 35 is an adjusting sleeve 45th inserted. The adjusting sleeve 45 is used to adjust the Spring preload on the adjuster sleeve 45 Return spring 33, which in turn with her opposite side is supported on the valve needle 28.

Die Einschubtiefe des Ventilsitzkörpers 25 mit der schalenförmigen Spritzlochscheibe 26 ist u.a. entscheidend für den Hub der Ventilnadel 28. Sie wird im wesentlichen durch die räumliche Lage des Bodenabschnitts 20 der Hülse 12 bereits vorgegeben. Dabei ist die eine Endstellung der Ventilnadel 28 bei nicht erregter Magnetspule 1 durch die Anlage des Ventilschließkörpers 30 an der Ventilsitzfläche 35 des Ventilsitzkörpers 25 festgelegt, während sich die andere Endstellung der Ventilnadel 28 bei erregter Magnetspule 1 durch die Anlage des Ankers 24 am Kernende 9 ergibt. Um das magnetische Kleben zu verhindern, kann zwischen dem Anker 24 und dem Kernende 9 eine Anschlagscheibe 47 vorgesehen sein, die z. B. aus nichtmagnetischem, verschleißfestem, walzhartem Material besteht. Eine Beschichtung der Oberflächen (z. B. Verchromen) von Kern 2 und Anker 24 in ihren Anschlagbereichen kann dann vermieden werden. Die Anschlagbereiche am Kern 2 und Anker 24 werden durch Rollglätten kaltverfestigt und verdichtet. Außerdem erfolgt die Hubeinstellung durch das axiale Verschieben des mit geringem Übermaß eingepreßten Kerns 2 in dem oberen Hülsenabschnitt 14 der Hülse 12. Der Kern 2 wird in der entsprechend gewünschten Position dann fest mit der Hülse 12 verbunden, wobei eine Laserschweißung am Umfang der Hülse 12 sinnvoll ist. Das Fügeübermaß der Preßpassung kann auch ausreichend groß gewählt werden, so daß die auftretenden Kräfte aufgenommen werden können und die vollständige Dichtheit garantiert ist, wodurch auf eine Schweißung verzichtet werden kann.The insertion depth of the valve seat body 25 with the cup-shaped spray hole disk 26 is, inter alia, critical for the stroke of the valve needle 28. It becomes essentially due to the spatial position of the bottom section 20 of the sleeve 12 already specified. The one end position is the Valve needle 28 when the solenoid 1 is not energized by the Contact of the valve closing body 30 on the valve seat surface 35 of the valve seat body 25 set while the other end position of the valve needle 28 when excited Magnetic coil 1 by the armature 24 resting on the core end 9 results. To prevent magnetic sticking, can between the armature 24 and the core end 9 a Stop plate 47 may be provided, the z. B. from non-magnetic, wear-resistant, hard-rolled material consists. A coating of the surfaces (e.g. Chrome plating) of core 2 and anchor 24 in their Stop areas can then be avoided. The Stop areas on the core 2 and anchor 24 are by Roll smoothing work hardened and compacted. Also done the stroke setting by moving the axially with small excess pressed core 2 in the upper Sleeve section 14 of the sleeve 12. The core 2 is in the according to the desired position then firmly with the sleeve 12 connected, wherein a laser welding on the circumference of the sleeve 12th makes sense. The interference of the press fit can also be chosen large enough so that the occurring Forces can be absorbed and complete Tightness is guaranteed, resulting in a weld can be dispensed with.

Ein Brennstoffilter 52 ragt in die Strömungsbohrung 43 des Kerns 2 an dessen zulaufseitigem Ende und sorgt für die Herausfiltrierung solcher Brennstoffbestandteile, die aufgrund ihrer Größe im Einspritzventil Verstopfungen oder Beschädigungen verursachen könnten. Das fertig eingestellte Einspritzventil ist weitgehend mit einer Kunststoffumspritzung 55 umschlossen, die sich vom Kern 2 ausgehend in axialer Richtung über die Magnetspule 1 bis zur Hülse 12 und sogar stromabwärts über den Bodenabschnitt 20 der Hülse 12 hinaus erstreckt, wobei zu dieser Kunststoffumspritzung 55 ein mitangespritzter elektrischer Anschlußstecker 56 gehört. Über den elektrischen Anschlußstecker 56 erfolgt die elektrische Kontaktierung der Magnetspule 1 und damit deren Erregung.A fuel filter 52 projects into the flow bore 43 of the Kerns 2 at its inlet end and ensures that Filtering out such fuel components, the due to their size in the injector clogging or Could cause damage. The finished one Injector is largely with one Plastic encapsulation 55 enclosed, which is from the core 2nd starting in the axial direction via the solenoid 1 to Sleeve 12 and even downstream over the bottom portion 20 the sleeve 12 also extends to this Plastic extrusion 55 an injected electrical Connector 56 belongs. About the electrical Connector 56 is the electrical contact Solenoid 1 and thus their excitation.

Durch den Einsatz der relativ billigen Hülse 12 wird es möglich, auf in Einspritzventilen übliche Drehteile, wie Ventilsitzträger oder Düsenhalter, die aufgrund ihres größeren Außendurchmessers voluminöser und bei der Herstellung teurer als die Hülse 12 sind, zu verzichten. In der Figur 2 ist die Hülse 12 des in der Figur 1 dargestellten ersten Ausführungsbeispiels als einzelnes Bauteil in einem anderen Maßstab dargestellt. Die dünnwandige Hülse 12 ist beispielsweise durch Tiefziehen ausgebildet worden, wobei als Werkstoff ein nichtmagnetisches Material, z. B. ein rostbeständiger CrNi-Stahl verwendet ist. Die als Blechziehteil vorliegende Hülse 12 dient, wie bereits erwähnt, aufgrund ihrer großen Erstreckung zur Aufnahme des Ventilsitzkörpers 25, der Spritzlochscheibe 26, der Ventilnadel 28 mit dem Anker 24, der Rückstellfeder 33 sowie zumindest teilweise des Kerns 2 und folglich auch des Anschlagbereichs von Anker 24 und Kern 2 zur Begrenzung des Hubes. In ihrem Bodenabschnitt 20 weist die Hülse eine zentrale Austrittsöffnung 58 auf, die einen solch großen Durchmesser besitzt, daß der über die Abspritzöffnungen 39 der Spritzlochscheibe 26 abgespritzte Brennstoff ungehindert das Einspritzventil verlassen kann. Soll die Hülse 12 in einem sogenannten Side-Feed-Einspritzventil eingesetzt werden, wie es die Figur 8 zeigt, so können sehr einfach in der Hülse 12 Einströmöffnungen 59 vorgesehen sein, die den Eintritt des Brennstoffs in das Innere der Hülse 12 erlauben. Das in der Figur 1 gezeigte Top-Feed-Einspritzventil besitzt eine Hülse 12, die keine Einströmöffnungen 59 aufweist, da der Brennstoff entlang der Ventillängsachse 10 axial über die Strömungsbohrung 43 in die Hülse 12 eintritt. Die Hülse 12 besitzt an ihrem dem Bodenabschnitt 20 gegenüberliegenden axialen Ende beispielsweise einen leicht radial nach außen gebogenen Umlaufrand 60. Der Umlaufrand 60 entsteht durch das Abtrennen des Stoffüberlaufes beim Tiefziehen. Die vormontierte Baugruppe aus Magnetspule 1, Spulenkörper 3, Magnetgehäuse 5 und Deckelelement 6 wird auf dem äußeren Umfang der Hülse 12 axial aufgeschoben, wobei durch den Umlaufrand 60 eine Begrenzung gegeben sein kann und im montierten Zustand eine Klemmung des Deckelelements 6 möglich ist. Der Spulenkörper 3, das Magnetgehäuse 5 und das Deckelelement 6 weisen allesamt zentrale Durchgangsöffnungen auf, durch die sich dann die Hülse 12 erstreckt.By using the relatively cheap sleeve 12, it will possible on turned parts common in injectors, such as Valve seat support or nozzle holder, which due to their larger outer diameter more voluminous and at the Manufacture are more expensive than the sleeve 12 to do without. In FIG. 2 is the sleeve 12 of the one in FIG. 1 illustrated first embodiment as a single Component shown on a different scale. The thin-walled sleeve 12 is, for example, by deep drawing been formed, using as a material non-magnetic material, e.g. B. a rust-resistant CrNi steel is used. The sleeve present as a sheet metal part As already mentioned, 12 serves because of its large size Extension for receiving the valve seat body 25, the Spray plate 26, the valve needle 28 with the armature 24, the return spring 33 and at least partially the core 2 and consequently also the stop area of anchor 24 and core 2 to limit the stroke. In its bottom section 20 points the sleeve has a central outlet opening 58, the one has such a large diameter that the over Spray openings 39 of the spray orifice plate 26 are sprayed Fuel can leave the injector unhindered. Should the sleeve 12 in a so-called side feed injection valve are used, as shown in FIG. 8, in this way, inflow openings 59 can be made very easily in the sleeve 12 be provided that the entry of the fuel into the Allow interior of the sleeve 12. The one shown in Figure 1 Top feed injector has a sleeve 12 that does not Has inflow openings 59 because the fuel along the Longitudinal valve axis 10 axially via the flow bore 43 in the sleeve 12 enters. The sleeve 12 has at that Bottom section 20 opposite axial end for example, a slightly radially outward curve Peripheral edge 60. The peripheral edge 60 arises from the Cutting off the material overflow during deep drawing. The pre-assembled assembly consisting of magnetic coil 1, coil body 3, Magnet housing 5 and cover element 6 is on the outer The circumference of the sleeve 12 is pushed axially, with the Circumferential edge 60 may be limited and in assembled state, a clamping of the cover element 6 is possible. The bobbin 3, the magnet housing 5 and that Cover element 6 all have central through openings through which the sleeve 12 then extends.

In der Figur 3 sind nochmals der untere Hülsenabschnitt 18 und der Bodenabschnitt 20 zusammen mit einem eingebauten Ventilsitzkörper 25 sowie einer daran befestigten Spritzlochscheibe 26 in geändertem Maßstab gezeigt. Die schalenförmige Spritzlochscheibe 26 besitzt neben einem Bodenteil 38, an dem der Ventilsitzkörper 25 befestigt ist und in dem wenigstens eine, beispielsweise vier durch Erodieren oder Stanzen ausgeformte Abspritzöffnungen 39 verlaufen, einen umlaufenden stromaufwärts verlaufenden Halterand 40. Der Halterand 40 ist stromaufwärts konisch nach außen gebogen, so daß dieser an der durch die Durchgangsöffnung 21 bestimmten inneren Wandung der Hülse 12 anliegt, wobei eine radiale Pressung vorliegt. Der Ventilsitzkörper 25 wird in die Hülse 12 kalteingepreßt und nicht verschweißt. Der Einpreßvorgang erfolgt beispielsweise in der Durchgangsöffnung 21 der Hülse 12 so lange, bis die z. B. durch Schweißen an dem Ventilsitzkörper 25 befestigte Spritzlochscheibe 26 mit ihrem Bodenteil 38 am Bodenabschnitt 20 der Hülse 12 anliegt. Der Halterand 40 der Spritzlochscheibe 26 weist an seinem Ende einen geringfügig größeren Durchmesser auf als den Durchmesser der Durchgangsöffnung 21 der Hülse 12, so daß der Halterand 40 an seinem Ende gegen die Hülse 12 drückt, wodurch neben dem Einpressen des Ventilsitzkörpers 25 eine weitere Sicherung gegen Verrutschen des Ventilsitzkörpers 25 gegeben ist.FIG. 3 again shows the lower sleeve section 18 and the bottom portion 20 together with a built-in one Valve seat body 25 and an attached thereto Spray hole disk 26 shown in a modified scale. The cup-shaped spray plate 26 has in addition to one Bottom part 38 to which the valve seat body 25 is attached and in which at least one, for example four, is passed through Eroding or punching molded injection orifices 39 run, a revolving upstream Retaining edge 40. Retaining edge 40 is conical upstream bent outwards, so that this at the by the Through opening 21 certain inner wall of the sleeve 12th is present, with a radial pressure. The Valve seat body 25 is cold pressed into the sleeve 12 and not welded. The press-in process takes place, for example in the through hole 21 of the sleeve 12 until the z. B. attached by welding to the valve seat body 25 Spray plate 26 with its bottom part 38 on Bottom portion 20 of the sleeve 12 abuts. The holding edge 40 of the Spray plate 26 has a slight at its end larger diameter than the diameter of the Through opening 21 of the sleeve 12 so that the holding edge 40th at its end presses against the sleeve 12, whereby next to the Pressing the valve seat body 25 into another fuse against slipping of the valve seat body 25 is given.

Als Alternative zu der in der Figur 1 dargestellten hülsenförmigen Ventilnadel 28 ist im Einspritzventil auch eine andere Ausführungsform einer Ventilnadel 28 denkbar, die in der Figur 4 gezeigt ist. Die Ventilnadel 28 ist bei diesem Ausführungsbeispiel als längliches massives Bauteil ausgebildet. Damit ist es nicht mehr möglich, den Brennstoff innerhalb der Ventilnadel 28 in Richtung zur Ventilsitzfläche 35 zuzuführen. Deshalb sind bereits im Anker 24 Austrittsbohrungen 62' vorgesehen, durch die der aus einer inneren Öffnung 63 des Ankers 24 gelangende Brennstoff strömen kann, um dann außerhalb der Ventilnadel 28 in der Durchgangsöffnung 21 der Hülse 12 weiter stromabwärts zu gelangen. Der Anker 24 ist beispielsweise gestuft ausgeführt, wobei ein oberer stromaufwärtiger Ankerabschnitt 64 einen größeren Durchmesser aufweist als ein unterer stromabwärtiger Ankerabschnitt 65. Die im Inneren des Ankers 24 verlaufende Öffnung 63 besitzt im unteren Ankerabschnitt 65 einen kleineren Querschnitt als im oberen Ankerabschnitt 64. Die Austrittsbohrungen 62' sind z. B. als radial verlaufende Querbohrungen in der Wandung des unteren Ankerabschnitts 65 vorgesehen. Eine feste Verbindung von Anker 24 und Ventilnadel 28 wird z. B. dadurch erreicht, daß der Anker 24 auf das stromaufwärtige Ende 66 der Ventilnadel 28 aufgepreßt wird, da zwischen der Ventilnadel 28 zumindest an ihrem einzupressenden Ende 66 und der Öffnung 63 eine Preßpassung vorliegt. Am Ende 66 der Ventilnadel 28 sind beispielsweise einige umlaufende, beispielsweise eingerollte Rillen 67 vorgesehen, die für ein Verkerben des Ankers 24 nach dem Aufpressen auf der Ventilnadel 28 dienen.As an alternative to that shown in Figure 1 sleeve-shaped valve needle 28 is in the injection valve too another embodiment of a valve needle 28 is conceivable, which is shown in Figure 4. The valve needle 28 is at this embodiment as an elongated solid component educated. It is no longer possible to use the fuel within the valve needle 28 towards Supply valve seat 35. That is why already in Armature 24 outlet holes 62 'are provided through which coming from an inner opening 63 of the armature 24 Fuel can flow to then outside the valve needle 28 further in the through opening 21 of the sleeve 12 to come downstream. The anchor 24 is for example staged, with an upper upstream Anchor section 64 has a larger diameter than a lower downstream anchor section 65. The in Inside the armature 24 extending opening 63 has in lower anchor section 65 a smaller cross section than in upper anchor portion 64. The exit bores 62 'are z. B. as radial transverse bores in the wall of the lower anchor portion 65 is provided. A firm one Connection of armature 24 and valve needle 28 is such. B. thereby achieved that the armature 24 on the upstream End 66 of the valve needle 28 is pressed, since between the Valve needle 28 at least at its end 66 to be pressed in and the opening 63 is an interference fit. In the end 66 the Valve needle 28 are, for example, some rotating for example, rolled grooves 67 are provided for a Notching the anchor 24 after pressing on the Serve valve needle 28.

Die Ventilnadel 28 ragt mit ihrem Ende 66 nach dem Einpressen nur so weit in die Öffnung 63 hinein, daß die Austrittsbohrungen 62' noch vollständig frei bleiben. Alternativ ist als Fügeverfahren jedoch auch das Laserschweißen in bekannter Weise möglich (siehe Figur 1). Die feste Verbindung von Ventilnadel 28 und kugelförmigem Ventilschließkörper 30 wird z. B. mittels Laserschweißen erzielt, wobei die Ventilnadel 28 an ihrem stromabwärtigen, dem Anker 24 abgewandten Ende einen angestauchten, kalottenförmigen Befestigungsflansch 68 aufweist. Der Befestigungsflansch 68 ist entsprechend dem Radius des kugelförmigen Ventilschließkörpers 30 ausgebildet.The valve needle 28 protrudes with its end 66 after the Press in only so far into the opening 63 that the Exit bores 62 'remain completely free. However, this is also an alternative as a joining process Laser welding possible in a known manner (see Figure 1). The fixed connection of valve needle 28 and spherical Valve closing body 30 is, for. B. by means of laser welding achieved, with the valve needle 28 at its downstream, end facing away from the armature 24, has dome-shaped mounting flange 68. The Mounting flange 68 is according to the radius of the spherical valve closing body 30 is formed.

Das in der Figur 5 dargestellte Brennstoffeinspritzventil entspricht im Grundaufbau dem in der Figur 1 gezeigten Einspritzventil. Im folgenden sollen deshalb nur die unterschiedlich ausgeführten Bauteile bzw. Baugruppen erläutert werden. Die gegenüber dem in Figur 1 dargestellten Ausführungsbeispiel gleichbleibenden bzw. gleichwirkenden Teile sind in allen weiteren Ausführungsbeispielen durch die gleichen Bezugszeichen gekennzeichnet. Anstelle des Magnetgehäuses 5 ist die Magnetspule 1 von wenigstens einem, beispielsweise als Bügel ausgebildeten und als ferromagnetisches Element dienenden Leitelement 70 umgeben. Das Leitelement 70 umgibt die Magnetspule 1 in Umfangsrichtung wenigstens teilweise und liegt mit seinem einen Ende an dem Kern 2 und seinem anderen Ende an der Hülse 12 z. B. im Bereich des oberen Hülsenabschnitts 14 an und ist mit diesem z. B. durch Schweißen, Löten bzw. Kleben verbindbar. Ein weiteres Unterscheidungsmerkmal liegt bei der Ausgestaltung des Ankers 24 vor. Im Unterschied zu dem in der Figur 4 dargestellten Anker 24, bei dem die Austrittsbohrungen 62' radial verlaufen, sind die Austrittsbohrungen 62" nun axial verlaufend ausgebildet, und zwar in einem Übergangsbereich 72, der eine Stufe zwischen oberem Ankerabschnitt 64 und unterem Ankerabschnitt 65 darstellt.The fuel injector shown in Figure 5 corresponds in its basic structure to that shown in FIG. 1 Injector. In the following, therefore, only the differently designed components or assemblies are explained. The compared to that shown in Figure 1 Embodiment constant or equivalent Parts are in all other embodiments by marked with the same reference numerals. Instead of Magnet housing 5 is the magnet coil 1 of at least one, For example, trained as a bracket and as Surrounding ferromagnetic element serving guide element 70. The guide element 70 surrounds the magnet coil 1 in Circumferential direction at least partially and lies with his one end to the core 2 and its other end to the Sleeve 12 z. B. in the region of the upper sleeve section 14 and is with this z. B. by welding, soldering or gluing connectable. Another distinguishing feature is included the design of the armature 24. Unlike that in the figure 4 anchor 24, in which the Exit bores 62 'are radial, are the Outlet bores 62 "are now formed axially, in a transition area 72, which is a step between the upper anchor section 64 and the lower anchor section 65 represents.

Der entscheidende Unterschied betrifft jedoch die Ausbildung der Hülse 12. Die beispielsweise gestufte, dünnwandige, unmagnetische Hülse 12 ist so ausgebildet, daß der obere, den Anker 24 führende Hülsenabschnitt 14 einen geringfügig größeren Durchmesser hat als der untere Hülsenabschnitt 18, wobei sich in gleichem Maße die Durchgangsöffnung 21 der Hülse 12 in stromabwärtiger Richtung verringert. Außerdem übernimmt der Bodenabschnitt 20 der Hülse 12 die Funktionen einer Spritzlochscheibe, so daß die Spritzlochscheibe 26 entfallen kann. Der Bodenabschnitt 20 weist ähnlich den bekannten Spritzlochscheiben wenigstens eine, beispielsweise vier Abspritzöffnungen 39 auf, die z. B. durch Stanzen oder Erodieren eingebracht sind.The key difference, however, concerns training the sleeve 12. The stepped, thin-walled, non-magnetic sleeve 12 is designed so that the upper, the armature 24 leading sleeve section 14 a little has a larger diameter than the lower sleeve section 18, the through opening 21 of the same degree Sleeve 12 reduced in the downstream direction. Moreover The bottom section 20 of the sleeve 12 takes over the functions an orifice plate, so that the orifice plate 26 can be omitted. The bottom portion 20 is similar to that known orifice plates at least one, for example four spray orifices 39 on the z. B. by punching or Eroding are introduced.

In der Figur 6 sind in Anlehnung an die Figur 3 nochmals der Ventilsitzkörper 25 und die Hülse 12 im Bereich des Bodenabschnitts 20 vergrößert dargestellt. Der Bodenabschnitt 20 ist wie eine übliche Spritzlochscheibe ausgebildet und besitzt also keine Austrittsöffnung 58, sondern nur die den Brennstoff zumessenden Abspritzöffnungen 39. Neben den bereits beschriebenen Verbindungs-, Halte- und Trägerfunktionen erfüllt die Hülse 12 nun auch noch eine Zumeß- und Abspritzfunktion. Der Ventilsitzkörper 25 kann entweder mit der Hülse 12 im Bereich des Bodenabschnitts 20 und/oder im Bereich des unteren Hülsenabschnitts 18 dicht verschweißt oder dicht in die Hülse 12 eingepreßt sein. Von Vorteil ist bei dieser Anordnung, daß auf ein Bauteil (Spritzlochscheibe 26) sowie wenigstens eine Verbindungsstelle verzichtet werden kann. Außerdem erhält die Hülse 12 mit diesem Bodenabschnitt 20 eine höhere Steifigkeit, was die Beschädigungsgefahr beim Handling der Ventilbauteile verringert.In FIG. 6, based on FIG Valve seat body 25 and the sleeve 12 in the area of Bottom section 20 is shown enlarged. The Bottom section 20 is like a conventional spray perforated disk trained and thus has no outlet opening 58, but only the spray openings that measure the fuel 39. In addition to the connection, holding and The sleeve 12 now also fulfills carrier functions Metering and spraying function. The valve seat body 25 can either with the sleeve 12 in the area of the bottom section 20 and / or in the region of the lower sleeve section 18 welded or pressed tightly into the sleeve 12. Of The advantage of this arrangement is that one component (Spray plate 26) and at least one Connection point can be dispensed with. Also receives the sleeve 12 with this bottom section 20 a higher one Rigidity, which reduces the risk of damage when handling the Valve components reduced.

Während sich die Hülse 12 bei den vorhergehenden Ausführungsbeispielen immer ungefähr über 2/3 der Länge des Einspritzventils erstreckte, besitzt das in der Figur 7 gezeigte Einspritzventil eine als Ventilgrundkörper dienende Hülse 12, die die Länge des Einspritzventils selbst vorgibt und somit auch nahezu über die gesamte Länge des Einspritzventils verläuft. Die durch das Einspritzventil durchgehende Hülse 12 hat den Vorteil, daß keine die Dichtheit beeinträchtigenden Verbindungsstellen mehr nötig sind. Eine Laserschweißung an der Hülse 12 ist auch deshalb nicht nötig, weil ein oberer Dichtring 74 unmittelbar auf der Hülse 12 abdichtet. Außerdem kann die Hubeinstellung sehr einfach erfolgen. Der Kern 2 wird dazu so weit in die Hülse 12 vom zulaufseitigen Ende des Brennstoffeinspritzventils her eingepreßt, bis der Hub der Ventilnadel 28 die gewünschte Größe erreicht. Danach wird der eingestellte Hub durch andere Montageschritte nicht mehr negativ beeinflußt. Der Bodenabschnitt 20 kann alternativ zu der in der Figur 7 gezeigten Version die Abspritzöffnungen 39 auch direkt aufweisen (vgl. Figur 5 und 6).While the sleeve 12 in the previous Embodiments always about 2/3 of the length of the Injector, which has in Figure 7 shown injection valve serving as a valve body Sleeve 12, which specifies the length of the injection valve itself and thus almost over the entire length of the Injector runs. That through the injector continuous sleeve 12 has the advantage that none of the Connection points impairing tightness are more necessary are. Laser welding on the sleeve 12 is also therefore not necessary because an upper sealing ring 74 is immediately on the sleeve 12 seals. In addition, the stroke setting done very easily. The core 2 is so far in the Sleeve 12 from the inlet end of Fuel injector pressed in here until the stroke of the Valve needle 28 reaches the desired size. After that the set stroke is no longer due to other assembly steps negatively influenced. The bottom section 20 may alternatively be the version shown in Figure 7, the spray orifices 39 also have directly (see FIGS. 5 and 6).

Die Montage des Einspritzventils erfolgt sehr einfach z. B. so, daß zuerst die Magnetspule 1, das Magnetgehäuse 5 und das Deckelelement 6 (oder alternativ wenigstens ein Leitelement 70) auf der Hülse 12 montiert werden, danach die Umspritzung mit Kunststoff 55 erfolgt, nachfolgend der Ventilsitzkörper 25 in die Hülse 12 eingepreßt und die Ventilnadel 28 mit Anker 24 eingebracht werden und dann der Kern 2 so weit eingepreßt wird, bis der Nennhub erreicht ist. Alle nachfolgenden Montageschritte sind bereits hinlänglich bekannt. Die Hülse 12 ist z. B. über ihre axiale Länge zweimal gestuft ausgeführt, wobei sich der Querschnitt der Durchgangsöffnung 21 in stromabwärtiger Richtung jeweils geringfügig verringert. Die z. B. im Anschlagbereich von Anker 24 und Kern 2 sowie oberhalb des Kerns 2 vorgesehenen Stufen erleichtern die Montage.The assembly of the injection valve is very simple, for. B. so that first the magnet coil 1, the magnet housing 5 and the cover element 6 (or alternatively at least one Guide 70) are mounted on the sleeve 12, then the Injection molding with plastic 55 takes place, hereinafter the Valve seat body 25 is pressed into the sleeve 12 and the Valve needle 28 are inserted with armature 24 and then the Core 2 is pressed in until the nominal stroke is reached is. All subsequent assembly steps are already well known. The sleeve 12 is, for. B. about their axial Length is carried out in two steps, the cross-section being different of the through hole 21 in the downstream direction slightly reduced. The z. B. in the stop area of Armature 24 and core 2 and provided above the core 2 Steps make assembly easier.

Die Figuren 8 und 9 sollen hauptsächlich verdeutlichen, daß eine erfindungsgemäße Hülse 12 auch in völlig anderen Ventiltypen, z. B. in sogenannten Side-Feed-Einspritzventilen, einsetzbar ist. Auf eine nähere Beschreibung des Einspritzventils wird verzichtet, da diese für ein solches Einspritzventil zumindest vom Grundaufbau her bereits aus der DE-OS 39 31 490 bekannt ist und übernommen werden kann. Die in der Figur 9 gezeigte Ventilnadel 28 mit einem in eine zentrale Ventilsitzkörperbohrung 75 des Ventilsitzkörpers 25 hineinragenden Spritzzapfen 76 kann vereinfacht gegenüber bekannten Ventilnadeln vergleichbarer Einspritzventile ausgebildet werden, indem nur ein Führungsabschnitt 77 vorgesehen ist. Üblicherweise besitzen solche Ventilnadeln zwei Führungsabschnitte 77. Die Ventilnadel 28 wird durch den Anker 24 in der Hülse 12 außerdem geführt. Wie bereits in der Figur 2 gezeigt, kann die Hülse 12 für den Einsatz in Side-Feed-Einspritzventilen wenigstens eine Einströmöffnung 59 aufweisen, über die die Brennstoffzufuhr in Richtung der Ventilsitzfläche 35 erfolgt.Figures 8 and 9 are intended primarily to illustrate that a sleeve 12 according to the invention also in completely different Valve types, e.g. B. in so-called side feed injectors, can be used. To a closer one Description of the fuel injector is omitted because of this for such an injection valve at least from the basic structure ago is already known from DE-OS 39 31 490 and can be taken over. The one shown in Figure 9 Valve needle 28 with a central Valve seat body bore 75 of valve seat body 25 protruding spigot 76 can be simplified compared to known valve needles of comparable injection valves be formed by only one guide portion 77 is provided. Such valve needles usually have two guide sections 77. The valve needle 28 is through the anchor 24 also guided in the sleeve 12. As before Shown in Figure 2, the sleeve 12 can be used in Side-feed injection valves have at least one inflow opening 59 have, via which the fuel supply in the direction of Valve seat 35 takes place.

Claims (12)

  1. Fuel injection valve for fuel injection systems of internal combustion engines, having a longitudinal valve axis (10), having a valve-closing body (30), which is part of a valve needle (28) that can be moved axially along the longitudinal valve axis (10) and which interacts with a valve seat (35) provided on a valve-seat body (25), having a thin-walled, axially extending non-magnetic sleeve (12), in which the valve needle (28) moves axially, characterized in that the sleeve (12) has at its downstream end a bottom portion (20) that extends along the longitudinal valve axis (10) substantially perpendicularly to the otherwise axial extent of the sleeve (12), and the valve-seat body (25) is surrounded both axially and radially by the sleeve (12), and in that the sleeve (12) has an axial extent that corresponds to more than half the axial length of the fuel injection valve itself, with the result that the sleeve (12) is surrounded in the circumferential direction by a magnet coil (1) that serves as an actuator of an electromagnetic circuit.
  2. Fuel injection valve according to Claim 1, characterized in that the electromagnetic circuit furthermore comprises an external magnetic conducting element (5, 70) and an inner core (2), the inner core (2) projecting at least partially into the sleeve (12), and the outer magnetic conducting element (5, 70) being arranged radially to the outside of the sleeve (12).
  3. Fuel injection valve according to one of the preceding claims, characterized in that the sleeve (12) is a deep-drawn sheet-metal part.
  4. Fuel injection valve according to one of the preceding claims, characterized in that the valve-seat body (25) is press-fitted into the sleeve (12) and rests both against the bottom portion (20) and against an axially extending lower sleeve portion (18).
  5. Fuel injection valve according to one of Claims 1 to 3, characterized in that at least one inflow opening (59) is provided in the axially extending wall of the sleeve (12).
  6. Fuel injection valve according to one of Claims 1 to 3, characterized in that an outlet opening (58), through which the fuel already metered in upstream of the bottom portion (20) of the sleeve (12) can emerge unhindered, is provided in the bottom portion (20) of the latter.
  7. Fuel injection valve according to Claim 1 and 6, characterized in that a perforated spray disc (26) is firmly connected to the valve-seat body (25) at the downstream end of this valve-seat body (25), and the perforated spray disc (26) rests at least partially against the bottom portion (20) of the sleeve (12), and the at least one ejection opening (39) of the perforated spray disc (26) opens into the outlet opening (58) of the bottom portion (20).
  8. Fuel injection valve according to one of Claims 1 to 3, characterized in that at least one ejection opening (39), which has the effect of metering the fuel, is provided in the bottom portion (20) of the sleeve (12).
  9. Fuel injection valve according to one of the preceding claims, characterized in that the sleeve (12) is stepped along its axial length, a reduction in the diameter of an inner through opening (21) of the sleeve (12) being achieved in the downstream direction with each step.
  10. Fuel injection valve according to one of the preceding claims, characterized in that the sleeve (12) extends over the entire axial length of the fuel injection valve.
  11. Fuel injection valve according to one of the preceding claims, characterized in that the axial sleeve portion (14, 18) of the sleeve (12) is at least partially surrounded by a valve housing.
  12. Fuel injection valve according to Claim 11, characterized in that the valve housing is embodied as a plastic encapsulation (55).
EP96924774A 1995-12-19 1996-07-26 Fuel injection valve Expired - Lifetime EP0812389B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19547406 1995-12-19
DE19547406A DE19547406B4 (en) 1995-12-19 1995-12-19 Fuel injector
PCT/DE1996/001391 WO1997022798A1 (en) 1995-12-19 1996-07-26 Fuel injection valve

Publications (2)

Publication Number Publication Date
EP0812389A1 EP0812389A1 (en) 1997-12-17
EP0812389B1 true EP0812389B1 (en) 2002-04-24

Family

ID=7780548

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96924774A Expired - Lifetime EP0812389B1 (en) 1995-12-19 1996-07-26 Fuel injection valve

Country Status (8)

Country Link
US (1) US6364220B2 (en)
EP (1) EP0812389B1 (en)
JP (2) JP3737123B2 (en)
KR (1) KR100442899B1 (en)
CN (1) CN1078667C (en)
DE (2) DE19547406B4 (en)
HK (1) HK1005666A1 (en)
WO (1) WO1997022798A1 (en)

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CN103573512B (en) * 2012-08-09 2017-06-23 福特环球技术公司 Magnetized fuel injector valve and valve seating

Also Published As

Publication number Publication date
US6364220B2 (en) 2002-04-02
HK1005666A1 (en) 1999-01-22
JP2005282576A (en) 2005-10-13
EP0812389A1 (en) 1997-12-17
CN1078667C (en) 2002-01-30
DE59609125D1 (en) 2002-05-29
DE19547406B4 (en) 2007-10-31
US20010002681A1 (en) 2001-06-07
DE19547406A1 (en) 1997-06-26
CN1173910A (en) 1998-02-18
KR19980702290A (en) 1998-07-15
WO1997022798A1 (en) 1997-06-26
JP3737123B2 (en) 2006-01-18
JPH11501100A (en) 1999-01-26
KR100442899B1 (en) 2004-11-16

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