EP0871822A1 - Valve a commande electronique - Google Patents

Valve a commande electronique

Info

Publication number
EP0871822A1
EP0871822A1 EP97924897A EP97924897A EP0871822A1 EP 0871822 A1 EP0871822 A1 EP 0871822A1 EP 97924897 A EP97924897 A EP 97924897A EP 97924897 A EP97924897 A EP 97924897A EP 0871822 A1 EP0871822 A1 EP 0871822A1
Authority
EP
European Patent Office
Prior art keywords
valve
connecting part
valve according
central region
valve seat
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
EP97924897A
Other languages
German (de)
English (en)
Other versions
EP0871822B1 (fr
Inventor
Ferdinand Reiter
Hubert Stier
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 EP0871822A1 publication Critical patent/EP0871822A1/fr
Application granted granted Critical
Publication of EP0871822B1 publication Critical patent/EP0871822B1/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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • 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
    • 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
    • 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

Definitions

  • the invention relates to an electromagnetically actuated valve according to the preamble of the main claim.
  • valve needle for an electromagnetically actuated valve which consists of an armature, a valve closing member and the armature with the z. B.
  • spherical valve closing member connecting sleeve-shaped connecting part, with fixed connections of the individual needle components z. B. are achieved by laser welding.
  • the armature surrounds the connecting part completely radially and at least partially axially, since the connecting part is fastened in a continuous longitudinal opening of the armature.
  • the connecting part itself also has a continuous inner longitudinal opening in which fuel can flow in the direction of the valve closing member, which then exits near the valve closing member through radially extending transverse openings made in the wall of the connecting part.
  • the tubular connecting part has a constant diameter over its entire axial length, so that there is a circular cross section as seen in the axial direction, which is only interrupted by a narrow longitudinal slot and transverse openings.
  • an electromagnetically actuated valve which has a valve needle, which is also composed of an armature, a valve closing member and a connecting part connecting both needle components.
  • the connecting part is made from a semi-finished profile and allows fluid flow only outside the profile.
  • the profile arms of the profiled connecting part are designed so that there are cross, Y, triangular, circular section-shaped and other cross sections. Due to the massive design of the connecting parts made from semi-finished products, the mass of the valve needle is comparatively large.
  • a fuel injector is already known from EP-OS 0 690 224, which has a nozzle opening which, when the valve is installed, is already inside an .suction channel, so that, while avoiding wall wetting, an .cumshot is largely directly on an inlet valve Internal combustion engine is possible. Moving the injection point forward may increase the mass and volume of the injection valve due to the lengthening of individual valve components.
  • the electromagnetically actuated valve according to the invention with the characterizing features of the main claim has the advantage that a reduction in the mass of the valve compared to valves of the same size can be achieved inexpensively in a simple manner.
  • Another advantage of the valve needle according to the invention lies in the ease of manufacture by means of bending and embossing processes.
  • the formation of the profiled connecting part can lead to a mass reduction of approx. 30% compared to connecting parts which are of a continuous tubular design with an annular cross-section, or an even greater mass reduction compared to solid valve needles. This saving in mass is particularly significant for elongated valves where the spray point of the
  • Valve is far ahead.
  • the spraying range is sufficient for.
  • Wall wetting of the intake pipe can be avoided in a simple manner by allowing targeted spraying onto one or more inlet valves, as a result of which the exhaust gas emission of the internal combustion engine and the fuel consumption are reduced. Since the wear forces on the valve seat of the valve are proportional to the mass of the valve needle, a significant reduction in wear on the valve seat can be achieved by reducing the mass.
  • Particularly suitable profiles for the connecting part of the valve needle have U, C, V or clasp-shaped cross sections. These geometries of the connecting parts have a high load capacity against bending and kinking. It is also advantageous to design further elongated components of the valve with as little mass as possible.
  • a thin-walled, non-magnetic sleeve, in whose inner longitudinal opening the valve needle moves axially, is therefore suitable as the valve seat carrier.
  • FIG. 1 shows an exemplary embodiment of a valve designed according to the invention
  • FIG. 2 shows a section through the valve needle and the valve seat support along the line II-II in FIG. 1
  • FIGS. 3a to 3d show exemplary embodiments of profiles of the connecting parts with U-, C-, V- and clasp-shaped cross-sections.
  • the electromagnetically actuated valve for example shown in FIG. 1, in the form of an injection valve for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines has a tubular core 2, which is surrounded by a magnetic coil 1 and serves as a fuel inlet connection, as a so-called inner pole.
  • a coil body 3 receives a winding of the magnetic coil 1 and, in conjunction with the core 2, enables a particularly compact structure of the injection valve in the area of the magnetic coil 1.
  • the core 2 is of stepped design and has a paragraph 5 in the axial extent of the magnetic coil 1 serves as a stop surface for an anchor 6.
  • the core 2 runs over the .Section 5 further in the downstream direction, so that a sleeve-shaped valve seat support 10 arranged downstream of the solenoid assembly does not have to be connected to the core 2 in the area of paragraph 5.
  • the core 2 has a tubular, but a much thinner wall than the other wall thickness of the core 2, which has a magnetic throttle point 13.
  • the throttle point 13 is connected in the downstream direction to a lower core end 14, which in turn has a significantly greater wall thickness than the throttle point 13 has.
  • a longitudinal opening 18 runs, which is also formed concentrically with the valve longitudinal axis 15.
  • a valve needle 19 according to the invention with an elongated connecting part 19 'is arranged, which at its downstream end 20 with a z. B.
  • spherical valve closing body 21 on the circumference, for example, five flats 22 for flowing past a fluid, in particular fuel, are provided, for example, is connected by welding.
  • the lower core end 14 of the Core 2 of valve seat support 10 is tightly connected, for example by welding, and axially surrounds part of core end 14 with an upper sleeve section 24.
  • the z. B. made of non-magnetic steel
  • valve seat carrier 10 In addition to the core end 14, valve seat carrier 10 also encloses at its opposite end a valve seat body 29 and a spray orifice plate 34 fastened to it.
  • the valve seat carrier 10 is elongated, the valve seat carrier 10 being able to make up half or more of the total axial extension length of the injection valve.
  • the injection point of the injection valve With this design of the valve seat support 10, the injection point of the injection valve is set far ahead. In the usual installation positions of injection valves in internal combustion engines, this means that the injection valve extends with its downstream end and thus with its metering and spraying area clearly into the intake pipe. This can be largely avoided by targeted spraying on one or more inlet valves, wall wetting of the intake pipe and as a result, the exhaust gas emission of the internal combustion engine can be reduced.
  • the injection valve is actuated electromagnetically in a known manner.
  • the electromagnetic circuit with the magnet coil 1, the core 2 and the armature 6 is used for the axial movement of the valve needle 19 comprising all the parts movable in the longitudinal opening 18 and thus for opening against the spring force of a return spring 25 or closing the injection valve with the end 40 of the valve closing body 21 facing away
  • the armature 6 envelops the end 40 of the connecting part 19 'at least partially.
  • a guide opening 32 of the valve seat body 29 is used to guide the valve closing body 21 during the axial movement of the valve needle 19 with the armature 6 along the valve longitudinal axis 15.
  • the armature 6 is guided in the core 2 even during the axial movement, particularly in the area of the magnetic throttle point 13.
  • the spherical valve closing body 21 interacts with the valve seat 30 of the valve seat body 29 which tapers in the shape of a truncated cone in the direction of flow.
  • the valve seat body 29 with the z. B. pot-shaped spray plate 34 firmly connected.
  • the spray orifice plate 34 has at least one, for example four, injection openings 35 formed by eroding, stamping or etching. A holding edge of the spray orifice plate 34 is conically bent outwards so that it bears against the inner wall of the valve seat carrier 10 determined by the longitudinal opening 18, a radial one Pressure is present.
  • the spray plate 34 is with the wall of the valve seat support 10, for example, by a circumferential and dense z. B. connected by a laser generated weld. A direct flow of the fuel into an intake line of the internal combustion engine outside the spray openings 35 is avoided by the welds on the spray orifice plate 34.
  • the insertion depth of the valve seat body 29 with the spray orifice plate 34 into the valve seat support 10 determines the size of the stroke of the valve needle 19.
  • the one end position of the valve needle 19 is when the valve is not energized Solenoid coil 1 is fixed by the contact of valve closing body 21 on valve seat 30, while the other end position of valve needle 19 is obtained when solenoid coil 1 is excited by the contact of armature 6 on paragraph 5 of core 2.
  • the magnet coil 1 is surrounded by at least one guiding element 45, for example in the form of a bracket and serving as a ferromagnetic element, which at least partially surrounds the magnet coil 1 in the circumferential direction and rests with its two ends on the core 2 upstream and downstream of the throttle point 13 and with this z .
  • B. can be connected by welding, soldering or gluing.
  • the electromagnetically actuated valve is largely with a outside of the valve seat support 10
  • Plastic encapsulation 50 which extends from the core 2 in the axial direction over the magnet coil 1 and the at least one guide element 45 to the valve seat support 10, the at least one guide element 45 being completely covered axially and in the circumferential direction.
  • This plastic encapsulation 50 includes, for example, an injection-molded electrical connector 52.
  • the electrical connector 52 is used to make electrical contact with the magnetic coil 1 and thus excite it.
  • valve seat carrier 10 makes it possible to dispense with the rotating parts which are customary in injection valves and which, owing to their larger outer diameter, are more voluminous and more expensive to manufacture than the valve seat carrier 10. This is particularly advantageous if, as in the present valve, the spray point is to be positioned far upstream / in front of it, since the material savings compared to known solid valve seat supports or nozzle holders is considerable.
  • the thin-walled valve seat support 10 is for example, formed by deep drawing, the material being a non-magnetic material, e.g. B. a rust-resistant CrNi steel is used.
  • the elongated valve seat support 10 has, near the lower end 55 of the plastic encapsulation 50, a circumferential annular bead 56 which is formed by folding and which projects outwards.
  • the end 55 of the plastic encapsulation 50 and the annular bead 56 together with the outer wall of the valve seat carrier 10 form an annular groove 57 in this area.
  • a sealing ring 58 arranged in the annular groove 57 serves to seal between the circumference of the injection valve and a valve receptacle, not shown, for example the one Intake pipe of the internal combustion engine.
  • the injection point of the injection valve downstream of the valve closing body 21 is, for. B. significantly further away from the magnet coil 1 or the stop area of the core 2 and armature 6 than an inlet end 59 of the core 2 or the entire injection valve of the magnet coil 1 or the abovementioned stop area.
  • the valve needle 19 also has a considerable length in comparison to the entire valve length, which length is, for. B. extends over more than half of the valve length and should be carried out by suitable measures particularly light, but still stable and inexpensive.
  • the connecting part 19 ' is, for. B. made of austenitic steel.
  • the two axial ends 20 and 40 of the connecting part 19 ' are designed to simplify the attachment of the armature 6 and the valve closing body 21 to them in a known manner, so that there is an annular profile in section, which is interrupted, for example, only by a narrow axially extending slot 60.
  • the connecting part 19 ' resembles a valve needle known from DE-OS 40 08 675. However, a different profile is provided over the largest part of the extension length of the connecting part 19 '.
  • a medium e.g. B.
  • the outer circumference is only to be understood as a contour line which runs away from the longitudinal valve axis 15 and therefore does not include the respective inner wall facing the longitudinal valve axis 15.
  • FIG. 2 shows a sectional illustration through the valve seat support 10 and the connecting part 19 'along the line II-II in FIG. 1, an example of a possible profile of the connecting part 19'.
  • the profiles of the connecting part 19 'according to the invention are distinguished in that they are open on one side and thus have U-shaped, V-shaped, C-shaped or slightly modified or modified cross-sections.
  • the connecting parts 19 ' can have cross sections according to FIGS. 3a to 3d. This is a U-shaped profile ( Figure 3a), in which variations are possible by rounding the corners, a C-shaped profile ( Figure 3b), which can also be closed further and so z. B.
  • a V-shaped profile in which the two legs 62 are either pointed directly to each other or the two legs 62 are connected via a rounded or straight base region 63, a gripper-like , Claw-shaped, cramp-shaped or clasp-shaped profile ( Figures 2 and 3d), in which the legs 62 run straight or rounded and have, for example, angled, bent, hook-like kinks 64.
  • connecting parts 19 ' are stamped and bent parts which are formed from originally flat sheet metal parts. Both the ends 20 and 40 with their circular cross sections and the central regions 61 with their special cross sections can be formed in a special bending tool.
  • the final contour of the connecting part 19 ' is achieved by bending and stamping processes. Compared to connecting parts 19 'with a continuous circular profile, a reduction in mass of approximately 30% is possible according to the invention.
  • the wear forces on the valve seat 30 can advantageously be reduced by the lower mass of the valve needle 19.

Landscapes

  • 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)
  • Magnetically Actuated Valves (AREA)

Abstract

La valve à commande électromagnétique est caractérisée en ce qu'un support de siège de soupape (10), ainsi qu'une aiguille d'injection (19) sont de forme générale allongée. De cette façon, le point d'injection de la valve est avantageusement déplacé vers l'avant, ce qui permet d'obtenir une injection très ciblée. Un élément de jonction (19') reliant l'induit (6) et le corps de fermeture de soupape (21) est réalisé sous forme d'une pièce découpée de flexion et présente, sur la plus grande partie de sa longueur axiale, un profil s'écartant d'une section transversale circulaire. L'aiguille d'injection (19) est ainsi d'une masse plus faible par rapport aux aiguilles d'injection de type connu de même grandeur. La valve est particulièrement appropriée pour l'utilisation dans des systèmes d'injection de carburant dans des moteurs à combustion interne à compression du mélange à allumage commandé.
EP97924897A 1996-08-09 1997-05-16 Valve à commande électromagnétique Expired - Lifetime EP0871822B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19632196 1996-08-09
DE19632196A DE19632196B4 (de) 1996-08-09 1996-08-09 Elektromagnetisch betätigbares Ventil
PCT/DE1997/001006 WO1998006939A1 (fr) 1996-08-09 1997-05-16 Valve a commande electronique

Publications (2)

Publication Number Publication Date
EP0871822A1 true EP0871822A1 (fr) 1998-10-21
EP0871822B1 EP0871822B1 (fr) 2006-08-23

Family

ID=7802247

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97924897A Expired - Lifetime EP0871822B1 (fr) 1996-08-09 1997-05-16 Valve à commande électromagnétique

Country Status (8)

Country Link
US (1) US5975436A (fr)
EP (1) EP0871822B1 (fr)
JP (1) JP2000500218A (fr)
KR (1) KR19990064075A (fr)
CN (1) CN1077652C (fr)
DE (2) DE19632196B4 (fr)
RU (1) RU2177075C2 (fr)
WO (1) WO1998006939A1 (fr)

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US6565019B2 (en) 2000-12-29 2003-05-20 Seimens Automotive Corporation Modular fuel injector having a snap-on orifice disk retainer and having an integral filter and O-ring retainer assembly
US6607143B2 (en) 2000-12-29 2003-08-19 Siemens Automotive Corporation Modular fuel injector having a surface treatment on an impact surface of an electromagnetic actuator and having a lift set sleeve
US6499668B2 (en) 2000-12-29 2002-12-31 Siemens Automotive Corporation Modular fuel injector having a surface treatment on an impact surface of an electromagnetic actuator and having a terminal connector interconnecting an electromagnetic actuator with an electrical terminal
US6523756B2 (en) 2000-12-29 2003-02-25 Siemens Automotive Corporation Modular fuel injector having a low mass, high efficiency electromagnetic actuator and having a lift set sleeve
US6520422B2 (en) 2000-12-29 2003-02-18 Siemens Automotive Corporation Modular fuel injector having a low mass, high efficiency electromagnetic actuator and having a terminal connector interconnecting an electromagnetic actuator with an electrical terminal
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US6695232B2 (en) 2000-12-29 2004-02-24 Siemens Automotive Corporation Modular fuel injector having interchangeable armature assemblies and having a lift set sleeve
US6520421B2 (en) 2000-12-29 2003-02-18 Siemens Automotive Corporation Modular fuel injector having an integral filter and o-ring retainer
US6523760B2 (en) 2000-12-29 2003-02-25 Siemens Automotive Corporation Modular fuel injector having interchangeable armature assemblies and having a terminal connector interconnecting an electromagnetic actuator with an electrical terminal
US6536681B2 (en) 2000-12-29 2003-03-25 Siemens Automotive Corporation Modular fuel injector having a surface treatment on an impact surface of an electromagnetic actuator and having an integral filter and O-ring retainer assembly
US6708906B2 (en) 2000-12-29 2004-03-23 Siemens Automotive Corporation Modular fuel injector having a surface treatment on an impact surface of an electromagnetic actuator and having an integral filter and dynamic adjustment assembly
US6533188B1 (en) 2000-12-29 2003-03-18 Siemens Automotive Corporation Modular fuel injector having a snap-on orifice disk retainer and having an integral filter and dynamic adjustment assembly
US6769636B2 (en) 2000-12-29 2004-08-03 Siemens Automotive Corporation Modular fuel injector having interchangeable armature assemblies and having an integral filter and O-ring retainer assembly
US6547154B2 (en) 2000-12-29 2003-04-15 Siemens Automotive Corporation Modular fuel injector having a terminal connector interconnecting an electromagnetic actuator with a pre-bent electrical terminal
US6655609B2 (en) * 2000-12-29 2003-12-02 Siemens Automotive Corporation Modular fuel injector having a low mass, high efficiency electromagnetic actuator and having an integral filter and o-ring retainer assembly
US6508417B2 (en) 2000-12-29 2003-01-21 Siemens Automotive Corporation Modular fuel injector having a snap-on orifice disk retainer and having a lift set sleeve
US6698664B2 (en) 2000-12-29 2004-03-02 Siemens Automotive Corporation Modular fuel injector having an integral or interchangeable inlet tube and having an integral filter and dynamic adjustment assembly
US6511003B2 (en) 2000-12-29 2003-01-28 Siemens Automotive Corporation Modular fuel injector having an integral or interchangeable inlet tube and having a terminal connector interconnecting an electromagnetic actuator with an electrical terminal
US6811091B2 (en) 2000-12-29 2004-11-02 Siemens Automotive Corporation Modular fuel injector having an integral filter and dynamic adjustment assembly
US7093362B2 (en) 2001-03-30 2006-08-22 Siemens Vdo Automotive Corporation Method of connecting components of a modular fuel injector
US6687997B2 (en) 2001-03-30 2004-02-10 Siemens Automotive Corporation Method of fabricating and testing a modular fuel injector
US6904668B2 (en) 2001-03-30 2005-06-14 Siemens Vdo Automotive Corp. Method of manufacturing a modular fuel injector
US6676043B2 (en) 2001-03-30 2004-01-13 Siemens Automotive Corporation Methods of setting armature lift in a modular fuel injector
US6676046B2 (en) 2001-08-06 2004-01-13 Siemens Automotive Corporation Closure member with armature strap
US7552880B2 (en) * 2004-08-05 2009-06-30 Continental Automotive Systems Us, Inc. Fuel injector with a deep-drawn thin shell connector member and method of connecting components
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Also Published As

Publication number Publication date
JP2000500218A (ja) 2000-01-11
US5975436A (en) 1999-11-02
DE59712713D1 (de) 2006-10-05
KR19990064075A (ko) 1999-07-26
CN1077652C (zh) 2002-01-09
WO1998006939A1 (fr) 1998-02-19
DE19632196A1 (de) 1998-02-12
CN1198799A (zh) 1998-11-11
EP0871822B1 (fr) 2006-08-23
DE19632196B4 (de) 2004-11-04
RU2177075C2 (ru) 2001-12-20

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