EP0772738B1 - Elektromagnetisch betätigbares ventil - Google Patents

Elektromagnetisch betätigbares ventil Download PDF

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Publication number
EP0772738B1
EP0772738B1 EP96900284A EP96900284A EP0772738B1 EP 0772738 B1 EP0772738 B1 EP 0772738B1 EP 96900284 A EP96900284 A EP 96900284A EP 96900284 A EP96900284 A EP 96900284A EP 0772738 B1 EP0772738 B1 EP 0772738B1
Authority
EP
European Patent Office
Prior art keywords
core
valve
armature
choke point
connection part
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
EP96900284A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0772738A1 (de
Inventor
Klaus Noller
Jürgen GRANER
Peter ASSLÄNDER
Peter Stieglitz
Marita GEISENDÖRFER-PIPP
Detlef Malinowski
Michael Lips
Rudolf Kalb
Karl-Heinz JÄGER
Robert Trunk
Andre Knackstedt
Heidi Arleth
Stefan Maier
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 EP0772738A1 publication Critical patent/EP0772738A1/de
Application granted granted Critical
Publication of EP0772738B1 publication Critical patent/EP0772738B1/de
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
    • 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
    • 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 electromagnetic Actuatable valve according to the preamble of claim 1 or 2 or 3. It is already an electromagnetically operated one Valve from DE-PS 40 03 227 known in which a Valve tube as the body of the valve made of three parts consists.
  • a magnetic valve seat support provided by which the magnetic flux over a Radial air gap radially into a valve needle attached anchor enters.
  • a core serves as magnetic inner pole, which is upstream of the Valve seat support is arranged and the magnetic Directs flow in the axial direction.
  • that Valve tube still a non-magnetic intermediate part that the The core and the valve seat support are hydraulically tight connects.
  • the non-magnetic intermediate part does not guide anyone magnetic flux, so that the magnetic flux as a useful flow goes through the anchor and the magnetic circuit is high Possesses effectiveness.
  • three individual components are required be made exactly for each other, in one defined position and then brought together get connected. So at least two fugues and Connections on, for example, welds are, which involves an additional amount of work and there is a risk of welding that the Parts to be welded together due to thermal deform conditional tensions.
  • the electromagnetically actuated valve according to the invention with the characterizing features of claim 1 or 2 or 3 has the advantage that the valve tube is particularly simple is constructed because it is composed of fewer components is, which also in a cost-effective manner Number of joints and joints is reduced by only magnetically conductive material for the entire valve tube is used and still the quality of the magnetic circuit is not degraded.
  • the valve pipe according to the invention a magnetically conductive, in radial direction thin-walled throttle point in the axial Extension area of the anchor has that very quickly in Saturation can be brought and by which the magnetic Stray flux is limited to a minimum.
  • valve tube is in one piece to be trained, because in any case the hydraulic tightness is guaranteed.
  • the one-piece valve tube extends completely along the entire length of the valve and there this also with it.
  • Valve seat carrier with the throttling point using a material much lower saturation flux density than for the core to use.
  • T 0.5 Tesla
  • the Throttle point saturates even earlier, so that e.g. B. the throttle cross section of the throttle point for one Increased mechanical strength of the valve tube can be.
  • the magnetic choke point it is particularly important to use the magnetic choke point so that at least one is at anchor provided guide surface as axially as possible central area of the throttle point during the Axial movement of the valve needle moves past.
  • the guide surfaces for the Anchor directly in the axially central area of the throttle point lie. This is the only way that the lateral forces can occur be kept to a minimum.
  • 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 designed according to the invention Valve
  • Figure 2 shows a section of the valve in the area Throttle point as a first example
  • Figure 3 shows a section second in the area of the throttle Example
  • Figure 4 shows a section of the valve in the area the throttle point as a third example
  • Figure 5 is a fourth Embodiment of a designed according to the invention Valve
  • Figure 6 shows a section of the valve in the area Throttle point as a fourth example
  • Figure 7 shows a section of the valve in the area of the throttle point as the fifth Example
  • Figure 8 shows a magnetic field line course at a Guide surface on the armature in the axial extent of the Throttle point
  • Figure 9 shows a magnetic field line course a guide surface at the throttle point
  • FIG. 10 a Magnetic field line course with a guide surface on the anchor outside the throttle.
  • Electromagnetically actuated valve in the form of a Injector for fuel injection systems from mixture-compressing, spark-ignition internal combustion engines has one surrounded by a magnetic coil 1, as Fuel inlet connector serving tubular core 2 as so-called inner pole.
  • a bobbin 3 takes one Winding of the magnetic coil 1.
  • the core 2 is not now as in the case of the injection valves of the prior art a component executed with a core end 9 also really completes but also continues in downstream direction, so that a downstream of the Coil body 3 arranged tubular connector, the hereinafter referred to as valve seat support 10, as a so-called outer pole in one piece with the core 2 is formed, the entire component as a valve tube 12 referred to as.
  • As a transition from core 2 to Valve seat support 10 also has a valve tube 12 tubular, but a much thinner wall than that Wall thicknesses of core 2 and valve seat support 10 having magnetic throttle point 13.
  • a longitudinal bore 18 runs in the valve seat support 10, which is concentric with the valve longitudinal axis 15.
  • a longitudinal bore 18 is a z.
  • tubular Valve needle 19 arranged at its downstream end 20 with a spherical valve closing body 21, on the Perimeter, for example, five flats 22 to flow past of the fuel are provided, for example by Welding is connected.
  • valve seat support 10 For the axial movement of the valve needle 19 and thus for opening against the spring force of a return spring 25 or Closing the injector is used for electromagnetic Circle with the magnetic coil 1, the core 2 and the armature 17th The armature 17 is connected to the valve closing body 21 opposite end of the valve needle 19 by a weld connected and aligned to the core 2. In the downstream end of the core 2 facing away Valve seat support 10 is in the longitudinal bore 18 cylindrical valve seat body 29, which has a fixed Has valve seat, tightly assembled by welding.
  • valve longitudinal axis 15 serves a guide opening 32 of the Valve seat body 29.
  • the spherical valve closing body 21 acts with the shape of a truncated cone in the direction of flow tapered valve seat of the valve seat body 29 together.
  • the valve seat body 29 On its end facing away from the valve closing body 21 is the valve seat body 29 with, for example pot-shaped spray plate 34 fixed connected.
  • the cup-shaped spray orifice plate 34 has at least one, for example four by eroding or Stamped molded orifices 35.
  • the armature 17 connected to the valve needle 19 during the axial movement are in the known Injectors used the non-magnetic intermediate parts, the extremely exact and highly accurate z. B. on Precision lathes are made to a small size To achieve leadership game. Since in the invention Injector now no intermediate part is necessary, it is sensible, at least one on the outer circumference of the armature 17 Guide surface 36 ( Figure 2), the z. B. by turning is made to provide.
  • the at least one Guide surface 36 may e.g. B. as a circulating continuous guide ring or as several along the circumference a spaced apart guide surfaces be executed.
  • the insertion depth of the valve seat body 29 with the pot-shaped spray plate 34 determines the size of the Strokes of the valve needle 19.
  • the one end position is the Valve needle 19 when the solenoid 1 is not excited by the System of the valve closing body 21 on the valve seat of the Valve seat body 29 set while the other End position of the valve needle 19 when the magnet coil 1 is excited results from the installation of the armature 17 at the core end 9.
  • the magnet coil 1 is of at least one, for example trained as a bracket and as a ferromagnetic element serving guide element 45 surrounding the solenoid 1 in Circumferentially at least partially surrounds and with his one end to the core 2 and its other end to the Valve seat support 10 rests and with these z. B. by Welding, soldering or gluing is connectable.
  • the injection valve is largely with a Plastic encapsulation 50 enclosed, which is from the core 2nd starting in the axial direction via the magnetic coil 1 and that at least one guide element 45 to the valve seat support 10 extends, the at least one guide element 45 is completely covered axially and in the circumferential direction.
  • a plastic encapsulation 50 belongs, for example co-molded electrical connector 52.
  • Das one-piece valve tube 12 extends completely over the entire length of the injection valve and therefore also gives it in front.
  • FIG. 2 shows a section of that in FIG. 1 shown injection valve in the field of magnetic Throttle point 13 shown enlarged.
  • the core end 9 of the Core 2 has a downstream end face 55 which as a stop surface for the armature 17 with its upper one End face 56 is used.
  • the valve tube 12 according to the invention is therefore only formed in one piece and thus has a direct magnetically conductive connection between the core 2 and the Valve seat support 10 via the magnetic throttle point 13.
  • the magnetic throttle point 13 Around the air gap 58 or the working air gap Keeping leakage flux as small as possible is the magnetic throttle point 13 with a very low Wall thickness trained.
  • the z. B. in the axial direction 2 mm long magnetic throttle point 13 has a wall thickness of for example 0.2 mm. So that's about a minimal Limit reached, at which there is still sufficient Stability of the valve tube 12 is ensured.
  • At The magnetic flux in the magnetic circuit is also excited directly via the very narrow magnetic throttle point 13. This is done in a very short time, namely only in one Fraction of the valve's actual switching time Saturation flux density reached.
  • the saturated and having a permeability of around 1 magnetic Throttle point 13 now really acts as a throttle point.
  • the section shown in Figure 3 also shows the area of the magnetic throttle point 13, wherein at this second embodiment an annular Stop piece 61 is inserted at the core end 9 of the core 2.
  • the stop piece 61 is made so large, for example, that there is even an inner through opening 62 of the core 2 limited and only radially outwards and upwards in Direction of the connector 52 is surrounded by the core 2.
  • On its lower end face 55 is the stop piece 61 for example chrome, similar to the stop area on Core end 9 without stop piece.
  • Such a stop piece 61 has the advantage over that shown in FIG Example that the exact machining of the sling area can still take place outside the valve tube 12 and only then the attachment of the stop piece 61 to the core end 9 is made.
  • As mounting options of the Stop piece 61 offer z. B. pressing or Laser tacking from the outside.
  • Another variant of the Attachment looks so that only by the Residual magnetism in the always closed magnetic circuit Stop piece 61 is held on the core 2.
  • valve tube 12 is in two parts trained, namely from the core 2 and the Valve seat carrier 10 consisting.
  • the magnetic throttle point 13 is provided in one piece, which as in the other examples from the valve seat support 10 as a very narrow (thin wall) cylinder area emerges. Seen in the axial direction, this is narrow Throttle point 13 is not directly in the core 2. Instead of which closes axially to the throttle point 13, for. B. from the end face 55, a wider sleeve portion 65, the radially surrounds the core 2 in the region of the core end 9. In order to provides the sleeve portion 65 the upstream end of the Valve seat support 10.
  • Valve seat support 10 The are firmly connected Valve seat support 10 and the core 2 by, for example circumferential weld seam 66 in the region of the sleeve section 65, the z. B. can be produced by means of a laser.
  • This two-part solution has the advantage that the End face 55 of the core 2 as a stop easier is editable since the sleeve section 65 of the later Valve seat support 10 is attached to the core 2.
  • the core 2 also in this two-part connecting tube 12 and the valve seat support 10 directly magnetically conductive connected with each other.
  • the magnetic throttle point 13 can in principle in the same way also in one piece with the core 2 be formed, the fixed connection then for example between a not shown Sleeve section of the core 2 and the valve seat support 10 he follows.
  • Valve seat supports 10 are significantly less than those Saturation flux density of the core 2, since the radial Magnetic flux transfer area from valve seat support 10 to anchor 17 is substantially larger (e.g. four times) than the cross sections of anchor 17 and core 2.
  • Saturation flux density e.g. B. with a nickel-iron alloy around 0.5 T
  • the saturation flux density of the for Core 2 used ferritic chrome steel is for example 1.8 T. This choice of materials therefore offers new possibilities of magnetic circuit training.
  • the magnetic flux through the throttle point 13 for a better valve function can be reduced, and on the other hand can the throttle cross section of the throttle point 13 for a higher mechanical strength of the valve tube 12 same magnetic stray flux can be increased.
  • the fourth shown in Figures 5 and 6 Embodiment has a different one than that previously shown and described valve seat support 10, namely a sleeve-shaped.
  • the sleeve-shaped Valve seat support 10 has a largely constant wall thickness, so that the necessary to install the injector Outer contours through the molding of the plastic extrusion 50 will be realized. Otherwise the sleeve-shaped Valve seat bracket 10 has the same functions as that Valve seat support 10 of Figures 1 to 4.
  • the sleeve-shaped Valve seat bracket 10 is at its upstream end ironed, d. H. to a significantly smaller wall thickness brought than over its entire other length. This The wall thickness is reduced in the axial area of the anchor 17, with which in turn the magnetic throttle point 13 is created.
  • valve seat support 10 extends then to the throttle point 13, for example its reduced wall thickness still further upstream and there only surrounds the core 2 radially at its core end 9.
  • weld 66 z. B. again a fixed one Connection of valve seat bracket 10 and core 2 reached.
  • Valve seat support 10 is of such a wall thickness outside of the ironed area that a sufficient valve stability is guaranteed. Since the Throttle cross section is very small due to the stretching, can also be an inexpensive, ferritic chrome steel with high saturation flux density such as can be used for core 2.
  • the magnetic Throttle point 13 has z. B. a wall thickness of 0.2 mm. In the embodiment shown in FIG.
  • valve seat support 10 which over its entire Length has a constant wall thickness, e.g. B. 0.5 mm.
  • This thicker sleeve-shaped valve seat support 10 stands out due to a higher stability also in the axial Extension area of the armature 17 and the core 2.
  • a material that is magnetic is now necessary is poorly conductive and therefore low Has saturation flux density. Saturation flux densities of around 0.5 T have z. B. nickel-iron alloys or pure Nickel.
  • the throttle cross section which in this example not through an immediately shaped magnetic Throttle point 13 would otherwise be characterized, that is for materials with saturation flux densities well above 0.5 T, allow too much leakage flux.
  • the core 2 consists, for. B. made of ferritic chrome steel.
  • the armature 17 is now performed on magnetic material, the two magnetic materials only by a z. B. 10 microns thick chrome layer on the armature 17 are separated.
  • Leading clearance of around 40 ⁇ m can be a ratio of maximum to minimum radial air gap 60 of 5: 1 arise, which is the cause of a very uneven distribution of the Magnetic flux in the radial air gap 60 can be.
  • Lateral Forces up to 4 N can occur. That is why the situation the anchor guide in the axial direction is an important one constructive and magnetic circuit-specific criterion.
  • FIG. 8 to 10 are cutouts Injectors shown, the z. B. the one in FIG. 1 correspond to the injector shown. You show that Areas around the magnetic choke point 13 and also illustrate the course of the magnetic field lines. Of the Magnetic flux radially from the valve seat support 10 into the armature 17 occurs and causes the large lateral forces can be kept particularly small if at least a guide surface 36 in the axial extent of the magnetic throttle 13 is located. The very quickly in Throttle point 13 reaching saturation ensures that only little magnetic flux can reach the guide surface 36 can.
  • Figure 10 shows only for comparison an arrangement in which outside the throttle point 13 on the armature 17 has a guide surface 36 is provided.
  • the magnetic field lines indicate that from Valve seat support 10 a high magnetic flux in the Guide surface 36 of the armature 17 merges, whereby at Anchor lying exactly in the center 17 large lateral forces can act on the anchor 17. Such an arrangement should therefore be avoided.
EP96900284A 1995-02-06 1996-01-18 Elektromagnetisch betätigbares ventil Expired - Lifetime EP0772738B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19503821 1995-02-06
DE19503821A DE19503821A1 (de) 1995-02-06 1995-02-06 Elektromagnetisch betätigbares Ventil
PCT/DE1996/000064 WO1996024763A1 (de) 1995-02-06 1996-01-18 Elektromagnetisch betätigbares ventil

Publications (2)

Publication Number Publication Date
EP0772738A1 EP0772738A1 (de) 1997-05-14
EP0772738B1 true EP0772738B1 (de) 1999-12-29

Family

ID=7753275

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96900284A Expired - Lifetime EP0772738B1 (de) 1995-02-06 1996-01-18 Elektromagnetisch betätigbares ventil

Country Status (8)

Country Link
US (1) US5769391A (ru)
EP (1) EP0772738B1 (ru)
JP (2) JPH11500509A (ru)
KR (1) KR100413554B1 (ru)
CN (1) CN1062333C (ru)
DE (2) DE19503821A1 (ru)
RU (1) RU2152533C1 (ru)
WO (1) WO1996024763A1 (ru)

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KR100413554B1 (ko) 2004-05-03
WO1996024763A1 (de) 1996-08-15
JPH11500509A (ja) 1999-01-12
DE59604032D1 (de) 2000-02-03
DE19503821A1 (de) 1996-08-08
CN1062333C (zh) 2001-02-21
CN1145653A (zh) 1997-03-19
RU2152533C1 (ru) 2000-07-10
US5769391A (en) 1998-06-23
JP2006138325A (ja) 2006-06-01
EP0772738A1 (de) 1997-05-14

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