EP0812389A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant

Info

Publication number
EP0812389A1
EP0812389A1 EP96924774A EP96924774A EP0812389A1 EP 0812389 A1 EP0812389 A1 EP 0812389A1 EP 96924774 A EP96924774 A EP 96924774A EP 96924774 A EP96924774 A EP 96924774A EP 0812389 A1 EP0812389 A1 EP 0812389A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
valve
fuel injection
valve seat
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.)
Granted
Application number
EP96924774A
Other languages
German (de)
English (en)
Other versions
EP0812389B1 (fr
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/fr
Application granted granted Critical
Publication of EP0812389B1 publication Critical patent/EP0812389B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 relates to a fuel injector according to the preamble of the main claim.
  • an electromagnetically actuated fuel injection valve is already known, which, among other things, has a non-magnetic sleeve as a connecting part between a core and a valve seat body. With its two axial ends, the sleeve is firmly connected to the core and to the valve seat body. The sleeve runs over its entire axial length with a constant outside diameter and a constant inside diameter and accordingly has equally large inlet openings at both ends.
  • the core and the valve seat body are designed with an outer diameter such that they extend into the sleeve at both ends, so that the sleeve completely surrounds the two components core and valve seat body in these protruding areas.
  • a valve needle with an armature moves in the axial direction, which is guided through the sleeve.
  • the fixed connections of the sleeve to the core and the valve seat body are, for. B. achieved by welding, ⁇ o as it is also known from DE-OS 43 10 819.
  • a thin-walled, non-magnetic sleeve is used as the connecting part between the core and the valve seat body of a fuel injector. In terms of its design, this sleeve largely corresponds to the sleeve known from US Pat. No. 4,946,107.
  • the volume and weight of the fuel injection valves can be reduced with the help of the tubular sleeves.
  • the sleeve has at its one axial end a bottom section running perpendicular to the axial extension of the sleeve, through which an optimal and secure fastening of the valve seat body is ensured and the stability of the sleeve is increased. To reduce the volume and weight, it also contributes above all that the sleeve extends over more than half the axial length of the fuel injector and can thus even take on the function of a fuel inlet connector.
  • valve seat body having a valve seat surface into the sleeve, a contact surface being provided through the bottom section of the sleeve, through which the valve seat body cannot slip. It is particularly advantageous to manufacture the sleeve by means of sheet metal deep drawing, since this method is simple and inexpensive and the required accuracy is nevertheless achieved.
  • a particular advantage is that the bottom section of the sleeve can be designed in such a way that spray openings for measuring fuel are provided in it. This is particularly cost-effective since there is no need for a component (perforated washer) and a connection point associated therewith.
  • Fuel injector is enough.
  • the sleeve thus also takes on the function of a fuel inlet connector.
  • the core can be pressed into the sleeve very easily, which means that the stroke of the valve needle can also be adjusted in a simple manner.
  • this long sleeve arrangement eliminates the problem of tightness towards the valve interior.
  • An upper sealing ring seals directly on the sleeve.
  • valve needles or anchors of the same shape can be used for completely different valve types due to the arrangement of the sleeve.
  • FIG. 1 shows a first exemplary embodiment of a fuel injection valve
  • FIG. 2 shows an exemplary embodiment of a sleeve according to the invention
  • FIG. 3 shows a first exemplary embodiment of a downstream end of the sleeve with a valve seat body installed
  • FIG. 4 shows a first exemplary embodiment of a valve needle that can be installed in an injection valve
  • FIG. 5 shows a second
  • FIG. 6 Exemplary embodiment of a fuel injector
  • FIG. 6 em second exemplary embodiment of a downstream end of the sleeve with a built-in valve seat body
  • FIG. 7 em third exemplary embodiment of a fuel injector
  • FIG. 8 em fourth exemplary embodiment of a fuel injector in the form of a side feed injector
  • FIG. 9 em second exemplary embodiment of an m Injector valve valve insert.
  • Exemplary embodiment shown electromagnetically actuated valve in the form of an injection valve for fuel injection systems of mixture-compressing, externally ignited internal combustion engines has a tubular core 2 which is surrounded by a magnet coil 1 and serves as a fuel inlet connector Core 2 having an outer diameter has a particularly compact and short structure of the injection valve in the area of the magnet coil 1.
  • the magnet coil 1 is embedded with its coil body 3, for example in a pot-shaped magnet housing 5, i. h it is completely surrounded by the magnet housing 5 m circumferentially and downwards.
  • Em m the extruded magnet housing 5 insertable cover member 6 ensures that the magnet coil 1 is covered upwards and thus for the complete encasing of the magnet coil 1 and serves to close the magnetic circuit. Due to this pot-shaped design, the magnet housing 5 with the magnet coil 1 is basically dry. An additional seal is not necessary.
  • a tubular and thin-walled sleeve 12 serving as a connecting part is connected to a lower core end 9 of the core 2, concentrically with a longitudinal valve axis 10, for example by welding, and surrounds the core end 9 partially axially with an upper sleeve section 14.
  • the coil former 3 overlaps the sleeve section 14 of the sleeve 12 at least partially axially.
  • the coil former 3 has a larger inner diameter than the diameter of the sleeve 12 in its upper sleeve section 14 over its entire axial extent.
  • the tubular sleeve 12 made of, for example, non-magnetic steel extends downstream with a lower sleeve section 18 to one end of the sleeve 12 that is downstream forming bottom section 20, which extends perpendicular to the axial extension of the sleeve 12.
  • the sleeve 12 is thus tubular over its entire axial length, in its entirety together with the
  • Bottom section 20 has a through opening 21 with a largely constant diameter, which runs concentrically to the valve longitudinal axis 10.
  • the sleeve 12 With its lower sleeve section 18, the sleeve 12 surrounds an armature 24 and further downstream a valve seat body 25.
  • a spray orifice disk 26, for example firmly connected to the valve seat body 25, is surrounded by the sleeve 12 in the circumferential direction by the sleeve section 18 and in the radial direction by the base section 20.
  • the sleeve 12 is thus not only a connecting part, but it also fulfills holding, support or receiving functions, in particular for the valve seat body 25, so that the sleeve 12 really valve seat support is also.
  • In the through opening 21 is a z. B.
  • tubular valve needle 28 arranged at its downstream, the spray hole 26 facing end 29 with a z.
  • the injection valve is actuated in a known manner, for. B. electromagnetic.
  • Valve needle 28 and thus for opening against the spring force of a return spring 33 or closing the injection valve, the electromagnetic circuit with the magnet coil 1, the core 2, the magnet housing 5 and the armature 24 is used.
  • the armature 24 is with the end facing away from the valve closing body 30 Valve needle 28 z. B. connected by a weld and aligned to the core 2.
  • a guide opening 34 of the valve seat body 25 serves to guide the valve closing body 30 during the axial movement of the valve needle 28 with the armature 24 along the valve longitudinal axis 10.
  • the armature 24 is guided in the sleeve 12 during the axial movement.
  • the cover element 6 is, for. B. a stamped part that after assembly of the magnet coil 1 in the magnet housing 5 by z. B. a Börde 1 connection 36 is held on the magnet housing 5.
  • the spherical valve closing body 30 interacts with a valve seat surface 35 of the valve seat body 25 which tapers in the shape of a truncated cone in the direction of flow and is formed in the axial direction downstream of the guide opening 34.
  • the valve seat body 25 On its end facing away from the valve closing body 30 is the valve seat body 25 with the spray-perforated disk, for example in the form of a shell 26 concentrically and firmly, for example connected by a weld, as shown in FIG. 3.
  • An adjusting sleeve 45 is inserted into a stepped flow bore 43 of the core 2, which runs concentrically to the longitudinal axis 10 of the valve and serves to supply the fuel in the direction of the valve seat, specifically the valve seat surface 35.
  • the adjusting sleeve 45 is used to adjust the spring preload of the return spring 33 abutting the adjusting sleeve 45, which in turn is supported on the valve needle 28 with its opposite side.
  • the insertion depth of the valve seat body 25 with the cup-shaped spray hole disk 26 is among others. decisive for the stroke of the valve needle 28. It is essentially predetermined by the spatial position of the bottom section 20 of the sleeve 12. The one end position of the valve needle 28 when the magnet coil 1 is not energized is determined by the contact of the valve closing body 30 on the valve seat surface 35 of the valve seat body 25, while the other end position of the valve needle 28 when the magnet coil 1 is energized results from the contact of the armature 24 at the core end 9 .
  • a stop disk 47 can be provided between the armature 24 and the core end 9, which, for. B. consists of non-magnetic, wear-resistant, hard-rolled material. A coating of the surfaces (e.g. chrome plating) of core 2 and armature 24 in their stop areas can then be avoided.
  • the stop areas on the core 2 and anchor 24 are by
  • the stroke is adjusted by axially displacing the core 2, which is pressed in with a slight oversize, in the upper sleeve section 14 of the sleeve 12.
  • the core 2 is then firmly connected to the sleeve 12 in the correspondingly desired position, laser welding on the circumference of the sleeve 12 making sense is.
  • the interference of the press fit can also be selected to be sufficiently large so that the forces which arise can be absorbed and complete tightness is guaranteed, as a result of which welding can be dispensed with.
  • a fuel filter 52 protrudes into the flow bore 43 of the core 2 at its inlet end and filters out those fuel components which, because of their size, could cause blockages or damage in the injection valve.
  • the injector is largely set with a
  • Plastic encapsulation 55 enclosed which extends from the core 2 in the axial direction over the magnetic coil 1 to the sleeve 12 and even downstream beyond the bottom portion 20 of the sleeve 12, with this
  • Kun ⁇ t ⁇ toffum ⁇ pritzung 55 a co-molded electrical connector 56 belongs. The electrical contacting of the magnetic coil 1 and thus its excitation takes place via the electrical connector 56.
  • FIG. 2 shows the sleeve 12 of the first exemplary embodiment shown in FIG. 1 as a single component on a different scale.
  • the thin-walled sleeve 12 is formed, for example, by deep drawing, the material being a non-magnetic material, e.g. B. a rust-resistant stainless steel is used.
  • the present sheet metal part 12 serves, due to its large extension, to accommodate the valve seat body 25, the spray hole disk 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 the armature 24 and core 2 to limit the stroke.
  • the sleeve has a central outlet opening 58 which is of such a large diameter that the fuel sprayed through the spray openings 39 of the spray plate 26 can leave the injection valve unhindered. If the sleeve 12 is to be used in a so-called side-feed injection valve, as shown in FIG. 8, inflow openings 59 can be provided very easily in the sleeve 12, which allow the fuel to enter the interior of the sleeve 12.
  • the top feed injector shown in FIG. 1 has a sleeve 12 which has no inflow openings 59, since the fuel enters the sleeve 12 axially along the longitudinal valve axis 10 via the flow bore 43.
  • the sleeve 12 At its axial end opposite the base section 20, the sleeve 12 has, for example, a slightly radially outwardly curved circumferential edge 60.
  • the circumferential edge 60 results from the separation of the material overflow during deep drawing.
  • the preassembled assembly of magnet coil 1, coil body 3, magnet housing 5 and cover element 6 is pushed axially onto the outer circumference of the sleeve 12, whereby a limitation can be given by the peripheral edge 60 and a clamping of the cover element 6 is possible in the assembled state.
  • the coil body 3, the magnet housing 5 and the cover element 6 all have central through openings through which the sleeve 12 then extends.
  • FIG. 3 shows the lower sleeve section 18 and the bottom section 20 together with an installed valve seat body 25 and one attached to it
  • Spray hole disk 26 shown in a modified scale.
  • the shell-shaped spray perforated disk 26 has a circumferential upstream holding edge 40.
  • the holding edge 40 is conical upstream bent outwards so that it bears against the inner wall of the sleeve 12 determined by the through opening 21, with a radial pressure being present.
  • the valve seat body 25 is cold pressed into the sleeve 12 and is not welded. The press-in process takes place, for example, in the through opening 21 of the sleeve 12 until the z. B.
  • the holding edge 40 of the spray hole disk 26 has a slightly larger diameter at one end than the diameter of the through-opening 21 of the sleeve 12, so that the holding edge 40 presses against the sleeve 12 at its end, as a result of which, in addition to the pressing in of the valve seat body 25, a further securing against The valve seat body 25 is slipped.
  • valve needle 28 is designed as an elongated solid component. It is therefore no longer possible to supply the fuel within the valve needle 28 in the direction of the valve seat surface 35. For this reason, outlet bores 62 ′ are already provided in the armature 24, through which the fuel coming from an inner opening 63 of the armature 24 can flow, in order to then reach further downstream outside the valve needle 28 in the through opening 21 of the sleeve 12.
  • the armature 24 is, for example, stepped, an upper one being upstream
  • Armature section 64 has a larger diameter than a lower downstream armature section 65.
  • the opening 63 running inside the armature 24 has a smaller cross section in the lower armature section 65 than in the upper armature section 64.
  • B. provided as radially extending cross holes in the wall of the lower anchor portion 65.
  • a firm one Connection of armature 24 and valve needle 28 is such. B. achieved in that the armature 24 is pressed onto the upstream end 66 of the valve needle 28, since there is an interference fit between the valve needle 28 at least at its end 66 to be pressed in and the opening 63.
  • a number of circumferential, for example rolled-in grooves 67 are provided, which serve to anchor the armature 24 after it has been pressed onto the valve needle 28.
  • valve needle 28 protrudes 66 so far into the opening 63 that the outlet bores 62 'remain completely free.
  • laser welding is also possible in a known manner (see FIG. 1).
  • the fixed connection of valve needle 28 and spherical valve closing body 30 is, for. B. achieved by means of laser welding, the valve needle 28 having an upset, dome-shaped fastening flange 68 at its end downstream of the armature 24.
  • the mounting flange 68 is designed according to the radius of the spherical valve closing body 30.
  • the magnet coil 1 is surrounded by at least one guide element 70 which is designed as a bracket and serves as a ferromagnetic element.
  • the guide element 70 surrounds the magnet coil 1 in
  • Circumferential direction at least partially and is at one end to the core 2 and the other end to the Sleeve 12 z. B. in the area of the upper sleeve section 14 and is z. B. connectable by welding, soldering or gluing.
  • Another distinguishing feature is in the design of the armature 24.
  • the outlet bores 62 ′ run radially
  • the outlet bores 62 ′′ are now designed to run axially, specifically in a transition region 72, which is a step between the upper anchor section 64 and the lower anchor section 65 represents.
  • the decisive difference relates to the design of the sleeve 12.
  • The, for example, stepped, thin-walled, non-magnetic sleeve 12 is designed in such a way that the upper sleeve section 14, which guides the armature 24, has a slightly larger diameter than the lower sleeve section 18, with the same extent the through hole 21 of the sleeve 12 is reduced in the downstream direction.
  • the bottom portion 20 of the sleeve 12 takes over the functions of an orifice plate, so that the orifice plate 26 can be omitted.
  • the bottom section 20 has at least one, for example four, spray openings 39 which, for. B. are introduced by punching or eroding.
  • valve seat body 25 and the sleeve 12 are again shown enlarged in the region of the base section 20, based on FIG. 3.
  • the bottom section 20 is designed like a conventional perforated spray disk and thus has no outlet opening 58, but only the spray openings 39 which meter the fuel.
  • the sleeve 12 now also performs a metering and spraying function.
  • the valve seat body 25 can either be tightly welded to the sleeve 12 in the area of the base section 20 and / or in the area of the lower sleeve section 18, or pressed tightly into the sleeve 12.
  • the advantage of this arrangement is that one component (spray disk 26) and at least one connection point can be dispensed with.
  • the sleeve 12 has a higher rigidity with this base section 20, which reduces the risk of damage when handling the valve components.
  • the injection valve shown in FIG. 7 has a sleeve 12 serving as a valve body, which itself specifies the length of the injection valve and thus also almost over the entire length The length of the injection valve runs.
  • the sleeve 12 passing through the injection valve has the advantage that none
  • Fuel injection valve is pressed in until the stroke of the valve needle 28 reaches the desired size. Then the set stroke is no longer negatively influenced by other assembly steps.
  • the bottom section 20 can also have the spray openings 39 directly (cf. FIGS. 5 and 6).
  • 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 element 70) are mounted on the sleeve 12, then the encapsulation with plastic 55 takes place, subsequently 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. All subsequent assembly steps are already well known.
  • the sleeve 12 is, for. B. stepped twice over its axial length, the cross section of the through hole 21 is reduced slightly in the downstream direction.
  • the z. B. provided in the stop area of anchor 24 and core 2 and above the core 2 steps facilitate assembly.
  • FIGS 8 and 9 are intended primarily to illustrate that a sleeve 12 according to the invention can also be used in completely different valve types, e.g. B. in so-called side feed
  • Injectors can be used. A detailed description of the injection valve is dispensed with, since it is already known from DE-OS 39 31 490 for such an injection valve, at least from the basic structure, and can be adopted.
  • the valve needle 28 shown in FIG. 9 with a spigot 76 protruding into a central valve seat body bore 75 of the valve seat body 25 can be formed in a simplified manner compared to known valve needles of comparable injection valves, in that only one guide section 77 is provided. Such valve needles usually have two guide sections 77.
  • the valve needle 28 is also guided by the armature 24 in the sleeve 12.
  • the sleeve 12 for use in side-feed injection valves can have at least one inflow opening 59, via which the fuel is supplied in the direction of the valve seat surface 35.

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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

L'invention concerne une soupape d'injection de carburant pour systèmes d'injection de carburant de moteurs à combustion interne pourvus d'un manchon (12) allongé dans le sens axial à parois minces en un matériau non magnétique. Le manchon (12) comprend à son extrémité en aval une section inférieure (20) sensiblement perpendiculaire à l'étendue axiale du manchon (12) le long d'un axe longitudinal (10) de la soupape. Un pointeau de soupape (28) solidarisé avec un induit (24) et un corps de fermeture (30) de soupape peut se déplacer axialement dans un orifice de passage (21) du manchon (12). Le corps de fermeture (30) de soupape coopère avec la surface d'appui (35) d'un siège de soupape (35) encastré dans le manchon (12) et qui s'appuie par exemple également sur la section inférieure (20) du manchon (12). Le manchon (12) formé par emboutissage profond d'une tôle métallique s'étend dans le sens axial sur plus de la moitié de la longueur axiale de la soupape d'injection de carburant. Cette soupape d'injection de carburant est particulièrement utile pour des systèmes d'injection de carburant de moteurs à combustion interne à allumage commandé et à haute compression du mélange.
EP96924774A 1995-12-19 1996-07-26 Soupape d'injection de carburant Expired - Lifetime EP0812389B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19547406A DE19547406B4 (de) 1995-12-19 1995-12-19 Brennstoffeinspritzventil
DE19547406 1995-12-19
PCT/DE1996/001391 WO1997022798A1 (fr) 1995-12-19 1996-07-26 Soupape d'injection de carburant

Publications (2)

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

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96924774A Expired - Lifetime EP0812389B1 (fr) 1995-12-19 1996-07-26 Soupape d'injection de carburant

Country Status (8)

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

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Also Published As

Publication number Publication date
DE19547406B4 (de) 2007-10-31
US20010002681A1 (en) 2001-06-07
KR19980702290A (ko) 1998-07-15
DE19547406A1 (de) 1997-06-26
WO1997022798A1 (fr) 1997-06-26
KR100442899B1 (ko) 2004-11-16
HK1005666A1 (en) 1999-01-22
JP3737123B2 (ja) 2006-01-18
US6364220B2 (en) 2002-04-02
DE59609125D1 (de) 2002-05-29
EP0812389B1 (fr) 2002-04-24
CN1173910A (zh) 1998-02-18
CN1078667C (zh) 2002-01-30
JPH11501100A (ja) 1999-01-26
JP2005282576A (ja) 2005-10-13

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