EP0975868B1 - Soupape a commande electromagnetique - Google Patents

Soupape a commande electromagnetique Download PDF

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Publication number
EP0975868B1
EP0975868B1 EP98963384A EP98963384A EP0975868B1 EP 0975868 B1 EP0975868 B1 EP 0975868B1 EP 98963384 A EP98963384 A EP 98963384A EP 98963384 A EP98963384 A EP 98963384A EP 0975868 B1 EP0975868 B1 EP 0975868B1
Authority
EP
European Patent Office
Prior art keywords
valve
core
valve according
magnetic
armature
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
EP98963384A
Other languages
German (de)
English (en)
Other versions
EP0975868A2 (fr
Inventor
Andreas Eichendorf
Thomas Sebastian
Ralf Trutschel
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 EP0975868A2 publication Critical patent/EP0975868A2/fr
Application granted granted Critical
Publication of EP0975868B1 publication Critical patent/EP0975868B1/fr
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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • 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
    • F02M51/0614—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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

Definitions

  • the invention is based on an electromagnetically actuated valve, in particular a valve for fuel injection systems of internal combustion engines, according to the genus of claim 1.
  • Fuel injection valves are already known which can be actuated electromagnetically and consequently have a magnetic circuit which has at least one magnetic coil, one Core, an armature and an outer pole.
  • a fuel injector is known for example from DE-195 03 821 A1.
  • the core and a connecting part are one Valve tube directly connected to each other via a magnetic throttle point. It is it is advantageous to form the entire valve tube in one piece, so that it extends over the extends the entire length of the valve.
  • the electromagnetically actuated valve according to the invention with the characteristic Features of claim 1 has the advantage that it is the manufacturing, Magnetic circuit-specific and tightness-related advantages of the design of the valve tube with a thin-walled throttle point and at the same time the Strength problems in the prior art can be avoided.
  • the ring-shaped insert is either not electrically To produce conductive material or to form interrupted at least one point and electrically insulated. This measure can prevent in the annular insert, which is necessarily at least partially is within the range of influence of the magnetic field of the magnet coil, while of a changing magnetic field eddy currents arise which have a negative impact on the Switching times (tightening time and closing time) of the valve.
  • a particularly advantageous embodiment of the annular insert consists in its construction from two concentric rings that are electrically isolated from each other and each have at least one slot, so that also for the insert electrically conductive material, such as an austenitic metal, with good Strength properties or dimensional stability properties can be used.
  • electrically conductive material such as an austenitic metal, with good Strength properties or dimensional stability properties can be used.
  • the two rings are preferably arranged such that their slots through 180 ° are positioned offset to each other to increase the mechanical stability of the construction improve or maintain.
  • the electromagnetic shown as an example in FIG. 1 as the first embodiment Actuable valve in the form of an injection valve for fuel injection systems from mixture-compressing, spark-ignition internal combustion engines has one of one Magnetic coil 1 at least partially surrounded as a so-called inner pole Serving magnetic circuit, tubular, largely hollow cylindrical core 2.
  • a Coil body 3 takes up a winding of the magnetic coil 1 and enables in Connection with the core 2 and an annular, non-magnetic, from the Magnetic coil 1 partially surrounded intermediate piece 4 with an L-shaped cross section a particularly compact and short structure of the injection valve in the area of Magnetic coil 1.
  • the intermediate piece 4 projects with one leg in the axial direction a step of the core 2 and with the other leg radially along one in the Drawing below the end face of the coil body 3.
  • a continuous longitudinal opening 5 is provided in the core 2, which extends along a Valve longitudinal axis 6 extends.
  • a concentric to the longitudinal valve axis 6 can preferably be In Fig. 1, not shown, additional thin-walled tubular sleeve extending the protrudes through the inner longitudinal opening 5 of the core 2 and directly on the wall of the Longitudinal opening 5 is present.
  • This sleeve has a sealing function to the core 2 by an encapsulation in the direction of the longitudinal axis 6 of the valve or in the downstream direction of the core 2 forms and thereby prevents contact of fuel with the core 2.
  • the core 2 is not a component as in conventional earlier injectors executed, which really ends with a lower core end 7, but runs also further in the downstream direction, so that a downstream of the coil former 3 arranged tubular connecting part, which in the further course of the description as Connection part 8 is referred to as a so-called outer pole in one piece with the core 2nd is formed, the entire component being referred to as valve tube 9.
  • the valve tube 9 also has a tubular shape, however a much thinner wall than the wall thicknesses of core 2 and connector 8 having a magnetic throttle point 10. This magnetic throttle point 10 goes out the lower core end 7 concentric with the valve longitudinal axis 6 of the core 2 and Connection part 8 out.
  • the throttle point 10 can only be formed in one piece either with the lower core end 7 or the connecting part 8.
  • a longitudinal bore 11 runs concentrically to the Longitudinal valve axis 6 is formed.
  • the longitudinal bore 11 is one, for example tubular valve needle 12 arranged at its downstream end 13 with a spherical valve closing body 14, on the circumference of several flats 15 for The fuel flows past, for example by welding connected is.
  • valve needle 12 For the axial movement of the valve needle 12 and thus for opening the injection valve against the spring force of a return spring 16 or to close the injection valve serves the electromagnetic circuit with the magnet coil 1, the core 2 and an armature 17.
  • the armature 17 is with the end facing away from the valve closing body 14
  • Valve needle 12 connected by a weld and aligned with the core 2.
  • the core 2 facing end of the connecting part 8 is in the Longitudinal bore 11 is a cylindrical valve seat body 18, which has a fixed valve seat has, tightly assembled by welding.
  • Valve seat body 18 To guide the valve closing body 14 during the axial movement of the valve needle 12 with the armature 17 along the longitudinal valve axis 6 serves a guide opening 19 in Valve seat body 18.
  • the spherical valve closing body 14 acts with the in Direction of flow of a tapered valve seat of the valve seat body 18 together.
  • the Valve seat body 18 On its end facing away from the valve closing body 14 is the Valve seat body 18 with, for example, a cup-shaped spray perforated disk 20 firmly connected.
  • the cup-shaped spray plate 20 has at least one z. B. by Eroding or stamping formed injection opening 21.
  • non-magnetic intermediate parts used, which are provided instead of the throttle point 10 and for a magnetic Ensure separation of core 2 and connector 8.
  • These non-magnetic intermediate parts are extremely precise and highly precise, for example on precision lathes made to achieve a little leadership game. Since in the shown in Figure 1 Injection valve due to the one-piece construction of the valve tube 9 now no such Intermediate part is necessary, it makes sense to have at least one on the outer circumference of the armature 17 Guide surface 22 ( Figure 2), which is produced for example by turning.
  • the at least one guide surface 22 can, for example, be a circumferential one continuous guide ring or as several on the circumference with a distance from each other trained guide surfaces.
  • the insertion depth of the valve seat body 18 with the cup-shaped spray perforated disk 20 determines the size of the stroke of the valve needle 12.
  • the one end position is the Valve needle 12 when the magnet coil 1 is not energized by the contact of the valve closing body 14 set on the valve seat of the valve seat body 18 while the other end position the valve needle 12 when the magnet coil 1 is energized by the contact of the armature 17 at the bottom Core end 7 results.
  • FIG. 1 of the connecting part 8 with the valve seat body 18 and from the armature 17, the valve needle 12 and the valve closing body 14 movable Valve part represents only one possible design variant of the magnetic circuit downstream following valve assembly.
  • this valve area waived, it should be emphasized that the most varied valve assemblies together with the construction of the injection valve according to the invention in the area of Throttle point 10 can be combined.
  • spherical valve closing body 14 and the use of spray perforated disks 20 are outward-opening injection valves are also conceivable.
  • the magnet coil 1 is formed by at least one, for example as a bracket and serve as a ferromagnetic guide element 23 surrounding the solenoid 1 at least partially surrounds in the circumferential direction, and with one end at the Core 2 and its other end abuts the connector 8 and with these to Example can be connected by welding, soldering or gluing.
  • the injection valve is largely enclosed with a plastic encapsulation 24 starting from the core 2 in the axial direction via the magnet coil 1 and that at least one guide element 23 extends to the connecting part 8, the at least a guide element 23 is completely covered axially and in the circumferential direction.
  • a plastic encapsulation 24 starting from the core 2 in the axial direction via the magnet coil 1 and that at least one guide element 23 extends to the connecting part 8, the at least a guide element 23 is completely covered axially and in the circumferential direction.
  • this Plastic extrusion 24 also includes, for example, an injection molding electrical connector 25, in which the contact elements 26 for electrical Contacting the solenoid 1 are provided.
  • section II from the injection valve shown in FIG. 1 is in the region of magnetic throttle point 10 shown enlarged.
  • the lower core end 7 of the core 2 has a downstream end face 27, which also serves as a stop face for the armature 17 its upstream end face 28 serves.
  • the valve tube 9 used in the present exemplary embodiment is therefore as above described, formed in one piece and has a direct magnetically conductive connection between the core 2 and the connecting part 8 via the magnetic throttle point 10.
  • Um to keep the leakage flux bypassing the air gap 29 as small as possible is magnetic throttle point 10 formed with a very small wall thickness.
  • the for Example in the axial direction 2 mm long magnetic throttle point 10 has one Wall thickness of only about 0.2 mm, for example. So that's about a minimal Limit reached, at which the valve tube 9 is still sufficiently stable at in Gasoline injectors for intake manifold injection with the usual low maximum pressures is guaranteed.
  • the magnetic flux in the magnetic circuit also directly over the very narrow magnetic throttle point 10 is in a very short time, namely only in a fraction of the actual switching time of the Valve that reaches saturation flux density.
  • the saturation and a permeability of around 1 having magnetic throttle point 10 thus really acts as Choke point.
  • a radial air gap 30 between the magnetic Throttle point 10 or the connecting part 8 and the armature 17.
  • This radial air gap 30 should be as narrow as possible, because the magnetic flux over the air radially enters the armature 17.
  • the total magnetic flux in the injection valve increases this arrangement compared to injectors with non-magnetic intermediate part the amount of magnetic flux through the throttle point 10 to.
  • the rest of the senior Cross sections of the core 2 and the guide element 23 are adapted accordingly or minirnal enlarged.
  • the construction of the valve according to the invention also includes Component an annular insert 31, the radially outside at the throttle 10th is arranged and axially along the entire throttle point 10 and partially along of the lower core end 7 extends.
  • the insert piece 31 is in a corresponding recess in the intermediate piece 4 used and fixed via a connecting layer 32 with the throttle point 10 and lower core end 7 connected.
  • A is preferably used as the connecting layer 32 Adhesive layer used because it forms both electrical insulation and Unevenness in the gap between insert 31 and throttle 10 or core end 7 can compensate.
  • the ring-shaped Insert 31 is not formed from a metal ring, which is good stability and would have strength properties, but on the other hand the generation of Eddy currents during a changing magnetic field would cause that have a negative effect on the switching times (tightening time and closing time) of the valve, because the metal ring 31 necessarily at least partially within the sphere of influence of the magnetic field of the magnetic coil 1.
  • the insert 31 should be made of an electrically non-conductive material or as one which is interrupted at least at one point and fastened in an electrically insulated manner Insert 31 be formed. Suitable as material for a one-piece insert 31 z. B. a plastic material, possibly reinforced by carbon fibers or the like is, or a ceramic material.
  • FIGS. 3 and 4 A preferred embodiment of the annular insert 31 is shown in FIGS. 3 and 4 shown.
  • the insert 31 consists of two in this embodiment concentric metal rings 33 and 34, which are mutually bonded by an adhesive layer 35 are electrically insulated and each have a slot 36 or 37. This way and In this way there is no closed electrically conductive circuit in the insert 31 and therefore, eddy currents cannot change in a changing magnetic field form the insert 31.
  • the two metal rings 33 and 34 are arranged such that their slots 36th are offset by 37 by 180 ° to one another, as can be seen from FIG.
  • austenitic metal is used for the two metal rings 33, 34.
  • the two metal rings 33 and 34 are first assembled glued together. Then the complete insert 31 with the Throttle point 10 glued. The gluing is advantageously carried out in two steps, so that the two metal rings 33 and 34 also provide axial support.
  • connection of the annular insert 31 to the throttle point 10 by means of Adhesive 32 also allows larger tolerances and unevenness on the corresponding diameters of the throttle point 10 and the insert 31. This enables the injection valve to be manufactured more cost-effectively.
  • the construction according to the invention has two major advantages. For one thing through the use of a one-piece or at least self-contained valve tube 9 created an injection valve with secure tightness, and on the other hand by the the stability of the arrangement increasing use of the annular insert 31 Construction also for in particular directly in the combustion chamber of an internal combustion engine Injecting high pressure valves can be used.

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

Claims (8)

  1. Soupape à commande électromagnétique, notamment injecteur pour une installation d'injection de carburant d'un moteur à combustion interne, comprenant une bobine électromagnétique (1), un noyau (2) entouré au moins en partie par la bobine électromagnétique (1) et ayant une ouverture longitudinale à l'intérieur (5), un induit (17), avec
    un organe d'obturation de soupape (14) coopérant avec un siège à soupape fine (18) et actionné par l'induit (17),
    une pièce de branchement (8), tubulaire, installée très largement en aval du noyau (2), entourant au moins en partie radialement l'induit (17) et un point d'étranglement magnétique (10) reliant le noyau (2) et la pièce de branchement (8),
    caractérisée par
    un insert annulaire (31) soutenant le point d'étranglement (10) dans la direction radiale.
  2. Soupape selon la revendication 1,
    caractérisée en ce que
    l'insert annulaire (31) est en matière non-électroconductrice notamment en matière plastique.
  3. Soupape selon la revendication 1,
    caractérisée en ce que
    l'insert annulaire (31) est interrompu au moins à un endroit et est fixé de manière à être isolé électriquement.
  4. Soupape selon la revendication 3,
    caractérisée en ce que
    l'insert (31) est formé de deux anneaux concentriques (33, 34), isolés électriquement l'un par rapport à l'autre et ayant chaque fois au moins une fente (36, 37).
  5. Soupape selon la revendication 4,
    caractérisée en ce que
    les fentes (36, 37) des anneaux (33, 34) sont décalés sensiblement de 180° l'une par rapport à l'autre.
  6. Soupape selon les revendications 4 ou 5,
    caractérisée en ce que
    les anneaux (33, 34) sont isolés électriquement l'un par rapport à l'autre par une couche de colle (35).
  7. Soupape selon les revendications 4 à 6,
    caractérisée en ce que
    les anneaux (33, 34) sont en un métal austénitique.
  8. Soupape selon l'une des revendications précédentes,
    caractérisée par
    un intervalle formé entre le point d'étranglement (10) et l'insert (31), cet intervalle étant rempli d'une couche de colle (32).
EP98963384A 1998-02-26 1998-11-26 Soupape a commande electromagnetique Expired - Lifetime EP0975868B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19808067 1998-02-26
DE19808067A DE19808067A1 (de) 1998-02-26 1998-02-26 Elektromagnetisch betätigbares Ventil
PCT/DE1998/003476 WO1999043948A2 (fr) 1998-02-26 1998-11-26 Soupape a commande electromagnetique

Publications (2)

Publication Number Publication Date
EP0975868A2 EP0975868A2 (fr) 2000-02-02
EP0975868B1 true EP0975868B1 (fr) 2003-05-21

Family

ID=7858964

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98963384A Expired - Lifetime EP0975868B1 (fr) 1998-02-26 1998-11-26 Soupape a commande electromagnetique

Country Status (8)

Country Link
US (1) US6201461B1 (fr)
EP (1) EP0975868B1 (fr)
JP (1) JP4219417B2 (fr)
KR (1) KR100624350B1 (fr)
CZ (1) CZ292950B6 (fr)
DE (2) DE19808067A1 (fr)
ES (1) ES2200400T3 (fr)
WO (1) WO1999043948A2 (fr)

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US5494225A (en) * 1994-08-18 1996-02-27 Siemens Automotive Corporation Shell component to protect injector from corrosion
DE4432525A1 (de) * 1994-09-13 1996-03-14 Bosch Gmbh Robert Verfahren zur Herstellung eines Magnetkreises für ein Ventil
DE19503821A1 (de) 1995-02-06 1996-08-08 Bosch Gmbh Robert Elektromagnetisch betätigbares Ventil
DE19739324A1 (de) * 1997-09-09 1999-03-11 Bosch Gmbh Robert Elektromagnetisch betätigbares Ventil

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CZ378999A3 (cs) 2000-06-14
ES2200400T3 (es) 2004-03-01
US6201461B1 (en) 2001-03-13
DE59808471D1 (de) 2003-06-26
WO1999043948A3 (fr) 1999-10-28
CZ292950B6 (cs) 2004-01-14
JP2001525905A (ja) 2001-12-11
KR100624350B1 (ko) 2006-09-18
JP4219417B2 (ja) 2009-02-04
EP0975868A2 (fr) 2000-02-02
DE19808067A1 (de) 1999-09-02
KR20010020263A (ko) 2001-03-15
WO1999043948A2 (fr) 1999-09-02

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