EP0865573A1 - Tige de soupape injectrice - Google Patents

Tige de soupape injectrice

Info

Publication number
EP0865573A1
EP0865573A1 EP97939954A EP97939954A EP0865573A1 EP 0865573 A1 EP0865573 A1 EP 0865573A1 EP 97939954 A EP97939954 A EP 97939954A EP 97939954 A EP97939954 A EP 97939954A EP 0865573 A1 EP0865573 A1 EP 0865573A1
Authority
EP
European Patent Office
Prior art keywords
valve
connecting part
closing element
opening
valve closing
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
EP97939954A
Other languages
German (de)
English (en)
Other versions
EP0865573B1 (fr
Inventor
Ferdinand Reiter
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 EP0865573A1 publication Critical patent/EP0865573A1/fr
Application granted granted Critical
Publication of EP0865573B1 publication Critical patent/EP0865573B1/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
    • F02M61/166—Selection of particular materials
    • 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
    • F02M51/0685—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 and the valve being allowed to move relatively to each other or not being attached to each other
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means

Definitions

  • the invention relates to a valve needle for an injection valve according to the preamble of the main claim.
  • a valve needle for an electromagnetically actuated valve is already known, which consists of an armature, a valve closing member and the armature with the z.
  • the armature encompasses the connecting tube completely radially and at least partially axially, since the connecting tube is fastened in a continuous longitudinal opening of the armature.
  • the connecting tube itself also has a continuous inner longitudinal opening, in which fuel can flow in the direction of the valve closing element, which then runs near the valve closing element through radially running in the wall of the connecting tube
  • valve needle in a fuel injector which is designed in two parts.
  • a cup-shaped armature is firmly connected to an elongated, rod-shaped, metal connecting part, at the downstream end of which a ball-section-shaped valve closing section is formed directly.
  • a connection piece which has an inner opening, runs out of the base part of the cup-shaped anchor. The inner opening is provided with a plurality of axially successive grooves, so that areas of larger and smaller diameters result in the opening in succession.
  • the connecting part projects with its end opposite the valve closing section, which is also grooved, into the opening of the connecting piece, as a result of which both metal components are connected to one another in a form-fitting manner.
  • a three-part valve needle for electromagnetically actuated injection valves is also known, which is formed by a tubular armature, a sleeve-shaped connecting part and a spherical valve closing body.
  • the connecting part made of a plastic engages behind locking elements on the outer circumference of the armature for firmly connecting the armature and the connecting part.
  • the downstream end of the connecting part has a dome-shaped recess in which the spherical valve closing body is snapped or clipped.
  • the lower part of the recess is so elastic that it widens when the valve closing body is pressed in, in order then to enclose the valve closing body closely.
  • valve needle according to the invention with the characterizing features of the main claim has the advantage that it can be manufactured in a particularly simple and inexpensive manner.
  • Each individual component of the valve needle namely an armature, a valve closing element and a connecting part connecting the armature to the valve closing element, can be very simple
  • the connecting part made of a plastic ensures that the valve needle is lighter than metal valve needles. Particularly in the case of injection valves with a far upstream spray point, in which relatively elongated valve needles are used, very good dynamic valve properties can still be achieved by such a design of the connecting part.
  • the damping properties of the plastic also ensure reduced noise.
  • the connecting part shaped according to the invention and the valve closing element have only a small outside diameter, so that an injection valve with such a valve needle can be made very slim.
  • connection between the connecting part and the valve closing element is particularly easy to achieve and nevertheless very secure. A loosening of the connection during the axial movement of the valve needle within the injection valve is completely excluded with this connection technology.
  • a particular advantage is the use of inexpensive rod material for the connecting part, which can be very easily brought to an exact length for use on the valve needle according to a desired valve length. In this way, valve needles for injection valves that have a far-reaching spray point can be shaped very easily.
  • the connecting part which is made of solid plastic, has the advantages of a small outer diameter, since there are no internal flow openings, and of a resulting low mass.
  • the very slim valve needle enables a particularly narrow construction of the injection valve, in particular a reduction in the size of the valve seat body compared to known injection valves.
  • FIG. 1 a shows a detail from FIG. 1 in the area of a guide disk for the valve needle and FIG. 2 shows a valve needle in a modified scale.
  • the valve shown in FIG. 1, for example, in the form of an electromagnetically actuated 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 former 3 takes up a winding of the magnetic coil 1 and, in conjunction with the core 2, enables one in particular compact design of the injection valve in the area of the solenoid coil 1.
  • a tubular, metallic connecting part 12 is tightly connected, for example by welding, concentrically to a longitudinal valve axis 10 and partially surrounds the core end 9 axially.
  • an elongated, thin-walled, sleeve-shaped valve seat support 16 extends, which is tight and tight with the
  • Connection part 12 is connected and has a clearly superior spray point due to its relatively large axial extent.
  • the connecting part 12 has a magnetic throttle point 13, which is characterized by a wall thickness which is substantially smaller than the wall thicknesses of the other sections of the connecting part 12.
  • Non-magnetic intermediate parts that are usually used can thus be dispensed with.
  • valve seat support 16 which also serves as a connecting part and represents a thin-walled sleeve, there is a longitudinal opening 17 which is concentric with the longitudinal valve axis 10 and on the wall of which an optionally insertable, also elongate, sleeve-shaped insulation element 18 is tight.
  • Insulating element 18 made of plastic extends over most of the axial extent of the connecting part 12 and the valve seat carrier 16 between a cup-shaped armature 20 and a valve seat body 21.
  • the insulating element 18, which mainly serves for thermal insulation is in the valve seat carrier 16 z . B. firmly pressed.
  • an inner longitudinal opening 19 which runs concentrically to the longitudinal valve axis 10, is again provided.
  • the longitudinal opening 19 is one Massively formed valve needle 22 according to the invention arranged, which at its downstream end a z. B. has a cylindrical valve closing element 23.
  • the entire valve needle 22 is formed by the armature 20, the valve closing element 23 and an elongated, rod-shaped connecting part 24 connecting the armature 20 and the valve closing element 23.
  • valve seat carrier 16 encloses in addition to the lower end of the connecting part 12 and at its opposite end the valve seat body 21 and a spray plate 25 attached to it.
  • the Injection point of the injection valve is upstream or far ahead. In the usual installation positions of injection valves in internal combustion engines, this means that the injection valve with its downstream end and thus with its metering and spraying area clearly extends into the intake pipe. As a result, targeted spraying onto one or more inlet valves largely avoids wetting the wall of the intake pipe and, as a result, reduces the exhaust gas emission of the internal combustion engine.
  • the injection valve is actuated in a known manner, electromagnetically in the injection valve shown in FIG.
  • the electromagnetic circuit with the magnet coil 1, the core 2 and the armature 20 serves for the axial movement of the valve needle 22 and thus for opening against the spring force of a return spring 26 or closing the injection valve.
  • the cup-shaped armature 20, for example, is facing away from the valve closing element 23 End 28 of the connecting part 24 firmly connected and aligned with the core 2.
  • opposite end of the valve seat support 16 is in the longitudinal opening 17 of the z.
  • Armature 20 is guided during the axial movement in the connecting part 12, particularly in the area of the magnetic throttle point 13.
  • a specially designed guide surface may be provided on the outer circumference of the armature 20 z. B.
  • the valve seat body 21 with the z. B. pot-shaped spray plate 25 firmly connected.
  • the spray hole disk 25 has at least one, for example four, spray openings formed by eroding, stamping or etching.
  • a holding edge of the spray hole disk 25 is conically bent outwards so that it bears against the inner wall of the valve seat carrier 16 determined by the longitudinal opening 17, with radial pressure being present.
  • the spray plate 25 is tightly connected to the wall of the valve seat carrier 16, for example by welding.
  • the insertion depth of the valve seat body 21 determines the size of the stroke of the valve needle 22.
  • the one end position of the valve needle 22 is when the valve is not energized Solenoid 1 is fixed by the valve closing element 23 resting on the valve seat 31, while the other end position of the valve needle 22 results when the magnet coil 1 is excited by the armature 20 resting on the core end 9.
  • the magnet coil 1 is surrounded by at least one guide element 38, which is designed, for example, as a bracket and serves as a ferromagnetic element, which at least partially surrounds the magnet coil 1 in the circumferential direction.
  • the injection valve is largely enclosed outside the valve seat carrier 16 with a plastic encapsulation 40, which includes, for example, an injection molded electrical connector 41.
  • FIG. 1 A section of the injection valve shown in FIG. 1 in the region of the guide disk 33 is shown enlarged in FIG.
  • the guide disk 33 is used for radial guidance of the valve needle 22 during its axial movement in the longitudinal opening 17 or 19 to avoid excessive wear on the valve seat 31 and asymmetrical flow conditions between the valve seat 31 and the spray openings in the spray hole disk 25.
  • a central through hole 43 is provided, which has a slightly larger diameter than the outer diameter of the valve closing element 23 of the valve needle 22. These dimensional differences lead to a minimal play of approx. 10 ⁇ m.
  • a plurality of passage openings 44 are introduced in the guide disk 33, which guarantee an unimpeded flow against the valve seat 31.
  • the passage openings 44 can also be chosen to be so small (eg ⁇ 60 ⁇ m) that they also perform a filter function.
  • FIG. 2 shows the valve needle 22 in which is composed of armature 20, connecting part 24 and valve closing element 23 different scale as a single component.
  • the cup-shaped armature 20 has an axially extending, circumferential jacket part 46 and a flat bottom part 47 lying perpendicular to the longitudinal axis 2 of the valve.
  • In the bottom part 47 of the armature 20 are at least one, for. B. three or four
  • Through openings 48 are provided, through which the fuel flows in the direction of the valve seat 31.
  • the fluid in particular a fuel, flows downstream of the through openings 48 along the outer circumference of the connecting part 24 in the longitudinal opening 19.
  • a central opening 49 is formed in the bottom part 47, through which the connecting part 24 extends with its end 28.
  • the armature 20, which is made of a soft magnetic material, is surface-treated and wear-resistant on its upper end face 50 facing away from the valve closing element 23 and serving as a stop, or on the outer circumference of the jacket part 46, e.g. B. chrome-plated.
  • the connecting part 24 has at its upper, with the
  • Anchor 20 connected end 28 a z. B. circumferential annular groove 52, the groove base of the annular groove 52 having a smaller outer diameter than the immediately upstream and downstream of the annular groove 52 following areas of the rod-shaped connecting part 24.
  • the annular groove 52 has an axial extent which is approximately the thickness of the bottom part 47 of the armature 20th corresponds, since the bottom part 47 engages in a form-fitting manner in the annular groove 52, so that the diameter of the groove base of the annular groove 52 and the diameter of the opening 49 of the armature 20 are the same size.
  • the connecting part 24 is designed such that it still protrudes a short distance into the interior of the armature 20.
  • the end 28 of the connecting part 24 protrudes into the return spring 26, which rests on an inner end face 53 of the base part 47 outside the central opening 49, and thus for centering the return spring 26.
  • the end 28 of the connecting part 24, which is partially surrounded by the return spring 26, has z. B. a circumferential chamfer 54.
  • the connecting part 24 consists of a plastic, the production for example by means of
  • connection part 24 is introduced into the opening 49 of the armature 20, for example, by being pressed in, pressed in or in a hot riveting process.
  • the connecting part 24 has an inner, blind hole-like opening 57, which runs concentrically to the longitudinal axis 10 of the valve or to the longitudinal axis of the valve needle 22, and into which the bolt-like valve closing element 23 is fitted.
  • a firm and positive connection between the connecting part 24 and the valve closing element 23 is achieved in that the valve closing element 23 is pressed into the opening 57.
  • the opening 57 has a plurality of circumferential, successive but 58 spaced apart grooves 58 over its axial extent. The opening 57 is thus alternately configured with a plurality of axially successive regions of larger and smaller diameters.
  • valve closing element 23 Since the valve closing element 23 is formed on its upper section 59, which engages in the connecting part 24, with a negative structure to the opening 57, that is, it also has regions of larger and smaller diameters alternating, a dimensionally accurate, secure positive locking of the valve closing element 23 in the opening 57 is guaranteed.
  • the form-fitting section 59 of the valve closing element 23 embedded in the connecting part 24 ends away from the armature 20 at a lower shoulder 60, from which the valve closing element 23 is formed downstream with a larger diameter than that of the section 59 and the z. B. on the lower end face 61 of the connecting part 24.
  • valve closing element 23 has, for example, a smaller outer diameter than the connecting part 24 over the largest part of its axial extent.
  • the positive connection of the valve closing element 23 and the connecting part 24 is achieved, for example, by pressing or pushing the valve closing element 23 into the opening 57.
  • the valve closing element 23 can, however, also be extrusion-coated directly in the plastic injection molding process for producing the connecting part 24 as an insert.
  • a snap-in of the valve closing element 23 is conceivable, the areas of smaller diameter of the opening 57 e.g. are chamfered, so that several sawtooth-like sections result in succession in the opening 57.
  • a further possibility of introducing the valve closing element 23 is that the valve closing element 23 is heated and sunk into the opening 57.
  • the valve closing element 23 can be subjected to ultrasound, as a result of which heating occurs, so that the plastic of the connecting part 24 near the opening 57 is partially melted when the valve closing element 23 is inserted. After cooling, there is a positive connection.

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)

Abstract

La tige de soupape (22) selon l'invention a ceci de caractéristique qu'un élément de raccord (24) reliant un élément d'ancrage (20) à un élément de fermeture de soupape (23) se présente sous forme de barre en plastique. Pour assembler de manière solide les différent composants de la tige, l'élément de raccord (24) s'associe par liaison de forme aussi bien à l'élément d'ancrage (20) qu'à l'élément de fermeture de soupape (23). La liaison de forme entre l'élément de raccord (24) et l'élément de fermeture de soupape (23) est telle que les zones correspondantes, de diamètre supérieur et de diamètre inférieur, s'enclenchent les unes dans les autres. La tige de soupape convient en particulier aux soupapes injectrices utilisées dans les systèmes d'injection de moteurs à combustion interne, à compression de mélange et à allumage commandé.
EP97939954A 1996-10-10 1997-08-16 Tige de soupape pour un injecteur Expired - Lifetime EP0865573B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19641785A DE19641785C2 (de) 1996-10-10 1996-10-10 Ventilnadel für ein Einspritzventil
DE19641785 1996-10-10
PCT/DE1997/001761 WO1998015733A1 (fr) 1996-10-10 1997-08-16 Tige de soupape injectrice

Publications (2)

Publication Number Publication Date
EP0865573A1 true EP0865573A1 (fr) 1998-09-23
EP0865573B1 EP0865573B1 (fr) 2003-04-09

Family

ID=7808371

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97939954A Expired - Lifetime EP0865573B1 (fr) 1996-10-10 1997-08-16 Tige de soupape pour un injecteur

Country Status (6)

Country Link
US (1) US6390392B1 (fr)
EP (1) EP0865573B1 (fr)
JP (1) JP2000502422A (fr)
KR (1) KR19990071854A (fr)
DE (2) DE19641785C2 (fr)
WO (1) WO1998015733A1 (fr)

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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
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
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US6502770B2 (en) 2000-12-29 2003-01-07 Siemens Automotive Corporation Modular fuel injector having a snap-on orifice disk retainer and having a terminal connector interconnecting an electromagnetic actuator with an electrical terminal
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
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JP5494680B2 (ja) * 2012-01-13 2014-05-21 株式会社デンソー 電磁弁
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Also Published As

Publication number Publication date
KR19990071854A (ko) 1999-09-27
DE19641785C2 (de) 1999-01-28
EP0865573B1 (fr) 2003-04-09
WO1998015733A1 (fr) 1998-04-16
JP2000502422A (ja) 2000-02-29
DE19641785A1 (de) 1998-04-23
DE59709782D1 (de) 2003-05-15
US6390392B1 (en) 2002-05-21

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