EP2320062B1 - Vanne d'injection et procédé de production associé - Google Patents

Vanne d'injection et procédé de production associé Download PDF

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Publication number
EP2320062B1
EP2320062B1 EP10178585A EP10178585A EP2320062B1 EP 2320062 B1 EP2320062 B1 EP 2320062B1 EP 10178585 A EP10178585 A EP 10178585A EP 10178585 A EP10178585 A EP 10178585A EP 2320062 B1 EP2320062 B1 EP 2320062B1
Authority
EP
European Patent Office
Prior art keywords
valve seat
valve
region
seat carrier
carrier
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.)
Not-in-force
Application number
EP10178585A
Other languages
German (de)
English (en)
Other versions
EP2320062A1 (fr
Inventor
Dieter 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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2320062A1 publication Critical patent/EP2320062A1/fr
Application granted granted Critical
Publication of EP2320062B1 publication Critical patent/EP2320062B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F02M51/0682—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the body being hollow and its interior communicating with the fuel flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/166—Selection of particular materials

Definitions

  • the invention relates to an injection valve, in particular for fuel injection systems of internal combustion engines in motor vehicles, according to the preamble of claim 1 and of a method for producing an injection valve according to the preamble of claim 9.
  • an injection valve with a valve seat carrier with a located at the end of the valve seat carrier, a valve opening enclosing the valve seat, arranged coaxially in the valve seat carrier, axially displaceably guided valve needle at its valve seat facing the needle end with the valve seat for closing and releasing the valve opening cooperating valve closing member carries, with an electromagnet for lifting actuation of the valve needle having an inner, hollow cylindrical magnetic core, an outer magnet pot, an intermediate, connected to a connector solenoid and a magnet core axially opposite magnet armature disposed on the side facing away from the valve closure member needle end of the valve needle is, wherein valve opening and valve seat are formed on the one-piece valve seat carrier itself, wherein the axially displaceable guide of the valve needle is assigned to the valve seat carrier, wherein Magnet coil and connector are combined in a plastic-coated separate coil part.
  • the injection valve according to claim 1 and the independent claims and the inventive method for producing an injection valve according to claim 8 and the independent claims have the advantage over the prior art that the valve seat carrier is made in a one-piece component and thus no connection processes are necessary. In particular, no weld connection is necessary, so that deformation due to the effect of heat is avoided.
  • a one-piece component which consists essentially of a magnetic and a non-magnetic material (hereinafter also called magnetic separation or magnetic throttle) (hereinafter also 2-component component or 3-component component called), a comparatively high magnetic force for lifting operation of the valve needle achieved. Furthermore, only comparatively small space for valve seat, valve seat carrier and magnetic separation is required. In addition, a relatively round run an upper to a lower needle guide is reached. Overall, it is possible according to the invention to adapt various areas of the valve seat carrier largely optimal in terms of their material to their respective tasks yet to ensure cost-effective manufacturability by the one-piece arrangement and to avoid the disadvantages of connection processes (such as the reduction of dimensional accuracy).
  • the valve seat carrier is made as MIM (Metal Injection Molding) part.
  • MIM Metal Injection Molding
  • valve seat carrier is made in the region of the valve seat substantially of the first material. Furthermore, the valve seat carrier on the valve seat axially opposite end of the second material (magnetic separation) is made. As a result, a comparatively high magnetic force for lifting the valve needle achievable with one-piece design of valve seat carrier and valve seat.
  • the valve seat carrier has injection holes in the region of the valve seat. Characterized in that the injection holes are introduced into the valve seat, a gluing example, a spray-orifice plate is no longer necessary and it is a manufacturing process saved.
  • the injection holes are drilled into the valve seat after the shaping or the injection holes are made by means of a laser method or by means of a removal method. This makes it possible that the injection holes are also introduced after the shaping of the valve seat carrier in these and manufactured by known technologies.
  • a surface of the valve seat carrier facing the valve needle is hardened in the region of the valve seat by means of a nitriding method or a surface coating method.
  • the valve seat carrier is manufactured as a 3-component component and is made in the region of the valve seat substantially of a third material, wherein the third material has a comparatively high hardness.
  • Another object of the invention is a method for producing an injection valve according to claim 8.
  • the valve seat carrier is manufactured in a one-piece component and there are no connection processes necessary. In particular, no weld connection is necessary, so that deformation due to the effect of heat is avoided.
  • the production of a one-piece component which essentially comprises a magnetic and a non-magnetic material, achieves a comparatively high magnetic force for the lifting operation of the valve needle.
  • valve seat only comparatively small space for valve seat, valve seat carrier and magnetic separation is required.
  • a relatively round run of the upper to the lower needle guide is reached. Because the injection holes are introduced directly into the valve seat, gluing in, for example, a spray perforated disk is no longer necessary and a manufacturing process is saved. Manufacturing using MIM technology requires comparatively few production steps.
  • the valve seat carrier is made in the region of the valve seat substantially of a third material, wherein the third material has a comparatively high hardness.
  • FIG. 1 In longitudinal section schematically illustrated injection valve according to the prior art is used in fuel injection systems of internal combustion engines in motor vehicles. It has a carrier 11 ', a valve needle 12 arranged coaxially in the carrier 11', an electromagnet 13 for actuating the valve needle 12, and a connecting piece 14 for supplying fuel.
  • the carrier 11 ' has a lower region, which is also referred to below as a valve seat carrier 11, and an upper region 201.
  • valve opening 15 and a valve seat 16 enclosing it are formed or formed in its bottom region.
  • a recess coaxial with the valve opening 15 is formed in the bottom of the valve seat carrier 11 on the outside facing away from the valve seat 16, in which a spray-orifice plate 17 is glued.
  • end of the carrier 11 ' is provided with an outer peripheral annular groove 18.
  • the hollow cylindrical valve needle 12 is open at its end remote from the valve seat 16 to the fuel inlet and carries at its valve seat 16 facing the other end a valve closure member 19 which cooperates with the valve seat 16 for releasing and closing the valve opening 15.
  • the valve needle 12 is provided with a radially through the cylinder wall passing through hole 20.
  • a magnet armature 21 is arranged, via which the valve needle 12 is guided axially displaceably in the valve seat carrier 11.
  • An aligned inside the valve closure member 19 flat surface 22 serves as a reflection surface for a Laser beam during dry adjustment of the valve lift.
  • the electromagnet 13 comprises, in addition to the integrally formed with the valve needle 12 magnet armature 21 an inner, hollow cylindrical magnetic core 23, an outer, deep-drawn magnet pot 24 and a magnetic core 23 and magnetic pot 24 inset magnetic coil 25, which consists of wound on a bobbin field windings.
  • the magnetic coil 25 is connected to a connector 26.
  • the hollow-cylindrical magnetic core 23 is pressed into the end of the carrier 11 'facing away from the valve seat 16 in this. Its offset determines the stroke of the valve needle 12th
  • the magnet coil 25 and the connector 26 are combined to form a plastic-encased coil part 27, which is pushed onto the carrier 11 '.
  • On the plastic-coated coil part 27 of the magnet pot 24 is placed, which surrounds the carrier 11 'with its cup bottom 241 and with its cup jacket 242 at the pot opening edge integrally formed on a valve seat carrier 11 radial flange 111 almost without play.
  • the radial flange 111 is arranged at the level of the magnetic core 23 on the valve needle 12.
  • valve needle 12 is pressed with its valve closure member 19 by a pressure spring designed as a valve closing spring 28 on the valve seat 16.
  • the valve closing spring 28 is supported on the one hand in a radial annular shoulder 121 formed in the interior of the valve needle 12 and on the other hand on an adjusting sleeve 29, which is pressed into the magnetic core 23.
  • the offset of the adjusting sleeve 29 determines the spring bias of the valve closing spring 28 and thus the closing force of the valve needle 12.
  • the connecting piece 14 is made as a separate plastic injection molded part with integrated filter 31. On the one hand, it has an annular web 141, which produces a clip connection with the annular groove 18 on the carrier 11 ', and a radially projecting mounting nose 142, which serves as an anti-rotation device and serves for the correct insertion of the injection valve into a fuel manifold.
  • FIG. 2 shows a schematic representation in longitudinal section of a first embodiment of an injection valve according to the invention.
  • the valve seat carrier 11 has the valve seat 16 with two spray holes 69. Furthermore, the valve seat carrier 11 on the radial flange 111.
  • the valve seat carrier 11 is connected by means of a gluing, soldering or welding connection 200 to the upper region of the carrier 11 '(hereinafter also referred to as the remaining valve structure 201).
  • the valve seat carrier 11 is made of a substantially magnetic first material in a first region 91 comprising at least the valve seat 16.
  • This first magnetic material comprises, for example, a ferromagnetic material, in particular an iron material, a cobalt material or a nickel material.
  • the valve seat carrier 11 is made according to the first embodiment in a second seat 92 facing away from the valve seat 16 made of a substantially non-magnetic second material (magnetic separation).
  • This second material comprises, for example, an austenitic material, in particular a steel material.
  • Valve seat 16 with spray holes 69 and the remaining valve seat carrier 11 are manufactured in a one-piece component, in particular by means of a 2-component MIM (Metal Injection Molding) method by injection molding of the two components and subsequent sintering produced.
  • MIM Metal Injection Molding
  • By manufacturing a one-piece component a comparatively improved concentricity of an upper to a lower needle guide 400 can be achieved (upper needle guide not shown for better illustration).
  • a welding of a portion of the valve seat with the rest of the valve seat carrier 11 is not required, so that distortion due to the effect of heat is avoidable.
  • a sealing seat region 300 is arranged on a valve needle 12 facing surface of the valve seat 16 and ensures the tight fit between the valve seat and (not shown here for clarity) valve needle 12.
  • the sealing seat portion 300 for example, by nitriding the surface of the valve seat 16 curable. In nitriding, the workpiece is heated in an evacuated oven, for example up to half the melting temperature. Then, inside the furnace, a nitrogen or carbon atmosphere is generated (carburizing). The nitrogen or carbon atoms then diffuse into the outermost layers of the workpiece. This method requires that the soft magnetic areas be shielded.
  • a hardening of the surface of the valve seat 16 by surface hardening in particular by inductive hardening by means of a frequency-dependent magnetic field or by flame curing, possible, whereby the edge layers of the workpiece are austenitized. Furthermore possible is hardening by means of laser or electron beam hardening.
  • FIG. 3 shows a schematic representation in longitudinal section of a second embodiment of an injection valve according to the invention.
  • the valve seat carrier 11 has at least one injection hole 69.
  • the valve seat carrier 11 on the radial flange 111.
  • the valve seat carrier 11 is formed of three materials. In the first region 91 of the valve seat carrier 11 is made of the magnetic first material. This first area 91 is shown hatched. Furthermore, the valve seat carrier 11 in the valve seat 16 facing away from the second region 92 of the non-magnetic second material (magnetic separation) is made. Furthermore, the valve seat 16 is made of a third material, wherein the third material is essentially a particularly hard material. As a particularly hard material, for example, a steel material or alternatively a hard metal can be used.
  • This 3-component component is molded by means of MIM technology, for example, the three components corresponding to the three materials.
  • the component or the valve seat carrier 11 is manufactured.
  • a subsequent hardening of the surface of the valve seat 16 is not necessary, so that it is possible to reduce the number of manufacturing steps considerably.
  • Each material component of the 2-component or 3-component according to the present invention comprises, for example, a metal powder with a binder, e.g. a plastic binder. By sintering the respective binder is removed again.
  • the injection holes 69 are produced, for example, directly during the manufacture of the one-piece valve seat carrier 11 by means of MIM process. Alternatively, it is possible to introduce the injection holes into the valve seat 16 only after the manufacture of the valve seat carrier 11. This is done, for example, by drilling, by a laser method or by a removal method, for example an ECM method (Electrochemical Machining).
  • the electrochemical machining process in the ECM process is characterized by an anodic electrochemical dissolution of the workpiece to be machined.
  • An electrolyte that flows through a gap between the tool and the workpiece removes the dissolved material and simultaneously cools the workpiece.
  • This electrochemical machining method it is possible to finish the workpiece in a single operation.

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

Claims (9)

  1. Soupape d'injection, en particulier pour installations d'injection de carburant de moteurs à combustion interne dans des véhicules automobiles, comprenant un support de siège de soupape (11), le support de siège de soupape (11) comprenant un siège de soupape (16), comprenant un pointeau de soupape (12) disposé dans le support de siège de soupape (11) et guidé de manière coulissante dans ce dernier, comprenant un électroaimant (13) pour actionner la course du pointeau de soupape (12), l'électroaimant (13) comprenant un noyau magnétique (23) cylindrique creux intérieur, un pot magnétique (24) extérieur, une bobine magnétique (25) raccordée à un connecteur de raccordement (26), et un induit magnétique (21) axialement opposé au noyau magnétique (23), l'induit magnétique (21) étant disposé au niveau de l'extrémité du pointeau de soupape (12) qui est opposée au siège de soupape (16), caractérisée en ce que le support de siège de soupape (11) est produit en tant qu'élément en une seule pièce, et en ce que le support de siège de soupape (11) comprend au moins une première région (91) et une deuxième région (92), le support de siège de soupape (11) étant fabriqué essentiellement à partir d'un premier matériau magnétique dans la première région (91) et étant fabriqué essentiellement à partir d'un deuxième matériau non magnétique dans la deuxième région (92), le support de siège de soupape (11) étant produit en tant que pièce obtenue par moulage par injection de métal (MIM).
  2. Soupape d'injection selon la revendication 1, caractérisée en ce que le support de siège de soupape (11) est fabriqué essentiellement à partir du premier matériau dans la région du siège de soupape (16).
  3. Soupape d'injection selon l'une quelconque des revendications précédentes, caractérisée en ce que le support de siège de soupape (11) comprend des trous d'injection (69) dans la région du siège de soupape (16).
  4. Soupape d'injection selon l'une quelconque des revendications précédentes, caractérisée en ce que les trous d'injection (69) sont percés dans le siège de soupape (16).
  5. Soupape d'injection selon la revendication 1, 2 ou 3, caractérisée en ce que les trous d'injection (69) sont fabriqués au moyen d'un procédé laser ou d'un procédé d'enlèvement.
  6. Soupape d'injection selon l'une quelconque des revendications précédentes, caractérisée en ce qu'une surface du support de siège de soupape (11) qui est tournée vers le pointeau de soupape (12) est durcie au moyen d'un procédé de nitruration ou d'un procédé de revêtement de surface dans la région du siège de soupape (16).
  7. Soupape d'injection selon la revendication 1, caractérisée en ce que le support de siège de soupape (11) est fabriqué essentiellement à partir d'un troisième matériau dans la région du siège de soupape (16), le troisième matériau présentant une dureté comparativement grande.
  8. Procédé de production d'une soupape d'injection, un pointeau de soupape (12) étant guidé de manière coulissante dans un support de siège de soupape (11) comprenant un siège de soupape (16), le pointeau de soupape (12) étant actionné par un électroaimant (13), l'électroaimant (13) étant fabriqué à partir d'un noyau magnétique (23) cylindrique creux intérieur, d'un pot magnétique (24) extérieur, d'une bobine magnétique (25) raccordée à un connecteur de raccordement (26), et d'un induit magnétique (21) axialement opposé au noyau magnétique (23), l'induit magnétique (21) étant disposé au niveau de l'extrémité du pointeau de soupape (12) qui est opposée au siège de soupape (16), caractérisé en ce que le support de siège de soupape (11) est fabriqué essentiellement à partir d'un premier matériau magnétique dans une première région (91), et est fabriqué essentiellement à partir d'un deuxième matériau non magnétique dans une deuxième région (92), et en ce que le support de siège de soupape (11) est produit en tant qu'élément en une seule pièce au moyen d'un procédé MIM.
  9. Procédé selon la revendication 8, caractérisé en ce que le support de siège de soupape (11) est fabriqué essentiellement à partir d'un troisième matériau dans la région du siège de soupape (16), le troisième matériau possédant une dureté comparativement grande.
EP10178585A 2009-11-06 2010-09-23 Vanne d'injection et procédé de production associé Not-in-force EP2320062B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009046466A DE102009046466A1 (de) 2009-11-06 2009-11-06 MIM 2K-Hülse für Einspritzventil

Publications (2)

Publication Number Publication Date
EP2320062A1 EP2320062A1 (fr) 2011-05-11
EP2320062B1 true EP2320062B1 (fr) 2012-05-09

Family

ID=43334592

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10178585A Not-in-force EP2320062B1 (fr) 2009-11-06 2010-09-23 Vanne d'injection et procédé de production associé

Country Status (4)

Country Link
EP (1) EP2320062B1 (fr)
AT (1) ATE557180T1 (fr)
DE (1) DE102009046466A1 (fr)
ES (1) ES2382692T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011088463A1 (de) 2011-06-29 2013-01-03 Robert Bosch Gmbh Bauteil für einen Magnetaktor sowie Verfahren zu dessen Herstellung
US9115678B2 (en) * 2012-08-09 2015-08-25 Ford Global Technologies, Llc Magnetized fuel injector valve and valve seat
DE102014213082A1 (de) * 2014-07-04 2016-01-07 Robert Bosch Gmbh Metallpulverspritzgießbauteil-Zwischenprodukt, Metallpulverspritzgießbauteil, Verfahren zum Herstellen eines Metallpulverspritzgießbauteils und Vorrichtung zum Herstellen eines Metallpulverspritzgießbauteils

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR9406079A (pt) * 1993-12-09 1996-01-16 Bosch Gmbh Robert Válvula acionável eletromagneticamente
DE102004058803A1 (de) 2004-12-07 2006-06-08 Robert Bosch Gmbh Einspritzventil
DE102005039288A1 (de) * 2005-08-19 2007-02-22 Robert Bosch Gmbh Verfahren zur Herstellung eines festen Gehäuses
DE102005052255B4 (de) * 2005-11-02 2020-12-17 Robert Bosch Gmbh Brennstoffeinspritzventil
JP4591593B2 (ja) * 2008-02-13 2010-12-01 株式会社デンソー 燃料噴射弁
EP2221468A1 (fr) * 2009-02-20 2010-08-25 Continental Automotive GmbH Injecteur de fluide

Also Published As

Publication number Publication date
DE102009046466A1 (de) 2011-05-12
EP2320062A1 (fr) 2011-05-11
ES2382692T3 (es) 2012-06-12
ATE557180T1 (de) 2012-05-15

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