EP1570170B1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
EP1570170B1
EP1570170B1 EP03812120.8A EP03812120A EP1570170B1 EP 1570170 B1 EP1570170 B1 EP 1570170B1 EP 03812120 A EP03812120 A EP 03812120A EP 1570170 B1 EP1570170 B1 EP 1570170B1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
armature
injection valve
valve
fuel
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
EP03812120.8A
Other languages
German (de)
English (en)
Other versions
EP1570170A1 (fr
Inventor
Manfred Roessler
Achim Degel
Rolf Keller
Markus Gesk
Guido Pilgram
Bernd Einwiller
Norbert Keim
Michael Lingner
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 EP1570170A1 publication Critical patent/EP1570170A1/fr
Application granted granted Critical
Publication of EP1570170B1 publication Critical patent/EP1570170B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49231—I.C. [internal combustion] engine making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49401—Fluid pattern dispersing device making, e.g., ink jet
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49405—Valve or choke making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49405—Valve or choke making
    • Y10T29/49412—Valve or choke making with assembly, disassembly or composite article making
    • Y10T29/49425—Valve or choke making with assembly, disassembly or composite article making including metallurgical bonding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49405—Valve or choke making
    • Y10T29/49426—Valve or choke making including metal shaping and diverse operation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49982—Coating

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim.
  • an electromagnetically actuated fuel injection valve is known, whose armature is characterized in that the inner pole facing armature stop surface is slightly wedge-shaped to minimize the hydraulic damping when opening the fuel injector and the hydraulic adhesion force after switching off the solenoid coil exciting current or completely. Further, by appropriate measures such as vapor deposition and nitriding, the abutment surface of the armature designed wear-resistant, so that the stop surface during the entire life of the fuel injection valve has the same size and the operation of the fuel injection valve is not affected.
  • document DE 35 01 973 A1 describes a fuel injector with a magnet assembly with a magnetizable ring as a solid component and a valve assembly with a movable component.
  • the valve By energizing the magnet assembly, the valve is opened, wherein the surface of the movable member is brought into abutment with the surface of the fixed component.
  • At least one abutment surface has to reduce the contact surface on a number of grooves or recesses, which are introduced by chipless material processing. These grooves or recesses have an angular shape in all the described embodiments. These recesses serve to reduce the amount of fuel present between the two abutment surfaces.
  • the adhesion between the abutment surfaces is reduced, so that less force must be used to pull the stop surfaces when closing the valve of the return spring.
  • the contact surfaces In order to reduce the abrasion and deformation on the contact surfaces by the continuous collision, the contact surfaces must be additionally hardened or coated with a particularly hard material. In order to obtain a reduced in their stop surface and simultaneously hardened contact surface, two separate manufacturing steps are necessary. This leads to a complex and costly production process. Also edged depressions make turbulence of fuel.
  • the WO 95/16125 also shows an electromagnetically operable fuel injection valve, in which at least one component, which in opening the valve in Plant is brought to a second component, having a stepped, ie edged surface, which in turn leads to turbulence.
  • the fuel injector according to the invention with the features of the main claim has the advantage that effectively protected by the design of the surface structure of the coating applied to the anchor, the armature stop surface and on the other hand, the hydraulic damping force is significantly reduced, whereby the fuel injection valve can be opened faster, resulting in more precise Metering times and quantities and a higher endurance limit results.
  • the coating has raised and recessed areas, the height difference between the areas being dimensioned so that the recessed areas still remain below the raised areas even after long operation.
  • the height difference is advantageously between 5 microns and 10 microns, which exceeds the normal removal after the break-in phase.
  • the coating is composed of one or more chromium layers.
  • FIGS. 2A and 2B An embodiment of an armature of a fuel injection valve according to the invention will be described in more detail, is intended to better understanding of the invention initially with reference to Fig. 1 an already known fuel injection valve will be briefly explained with respect to its essential components.
  • FIG. 1 illustrated embodiment of a fuel injection valve 1 is carried out in the form of a fuel injection valve 1 for fuel injection systems of mixture-compression, spark-ignition internal combustion engines.
  • the fuel injection valve 1 is suitable in particular for the direct injection of fuel into a combustion chamber, not shown, of an internal combustion engine.
  • the fuel injection valve 1 consists of a nozzle body 2, in which a valve needle 3 is arranged.
  • the valve needle 3 is operatively connected to a valve closing body 4 which cooperates with a valve seat body 6 arranged on a valve seat body 5 to form a sealing seat.
  • the fuel injection valve 1 in the exemplary embodiment is an inwardly opening fuel injection valve 1 which has an injection opening 7.
  • the nozzle body 2 is sealed by a seal 8 against an outer pole 9 of a magnetic coil 10.
  • the magnetic coil 10 is encapsulated in a coil housing 11 and wound on a bobbin 12, which rests against an inner pole 13 of the magnetic coil 10.
  • the inner pole 13 and the outer pole 9 are separated by a constriction 26 and connected to each other by a non-ferromagnetic connecting member 29.
  • the magnetic coil 10 is energized via a line 19 from a via an electrical plug contact 17 can be supplied with electric current.
  • the plug contact 17 is surrounded by a plastic casing 18, which may be molded on the inner
  • valve needle 3 is guided in a valve needle guide 14, which is designed disk-shaped.
  • armature 20 On the other side of the dial 15 is the armature 20. This is a non-positively connected via a first flange 21 with the valve needle 3 in connection, which is connected by a weld 22 with the first flange 21.
  • a return spring 23 On the first flange 21, a return spring 23 is supported, which is brought in the present design of the fuel injection valve 1 by a sleeve 24 to bias.
  • valve needle guide 14 in the armature 20 and on a guide element 36 extend fuel channels 30, 31 and 32.
  • the fuel is supplied via a central fuel supply 16 and filtered by a filter element 25.
  • the fuel injection valve 1 is opposed by a seal 28 a fuel distribution line not shown and sealed by a further seal 37 against a cylinder head, not shown.
  • annular damping element 33 On the discharge side of the armature 20, an annular damping element 33, which consists of an elastomer material, arranged. It rests on a second flange 34 which is non-positively connected to the valve needle 3 via a weld seam 35.
  • the armature 20 In the resting state of the fuel injection valve 1, the armature 20 is acted upon by the return spring 23 counter to its stroke direction so that the valve closing body 4 is held on the valve seat surface 6 in sealing engagement. Upon energization of the solenoid coil 10, this builds up a magnetic field, which moves the armature 20 against the spring force of the return spring 23 in the stroke direction, wherein the stroke is determined by a located in the rest position between the inner pole 12 and the armature 20 working gap 27.
  • the armature 20 takes the first flange 21, which is welded to the valve needle 3, also in the stroke direction with.
  • the valve closing body 4 communicating with the valve needle 3 lifts off from the valve seat surface 6, and the fuel guided via the fuel channels 30 to 32 is sprayed through the injection opening 7.
  • the armature 20 drops after sufficient degradation of the magnetic field by the pressure of the return spring 23 from the inner pole 13, whereby the valve connected to the needle 3 in communication first flange 21 moves against the stroke direction.
  • the valve needle 3 is thereby moved in the same direction, whereby the valve closing body 4 touches on the valve seat surface 6 and the fuel injection valve 1 is closed.
  • Fig. 2A shows in a highly schematic, fragmentary illustration of the inner pole 13 of the fuel injection valve 1 facing anchor stop surface 38.
  • the armature 20 can, as in the in Fig. 1 already be described in more detail fuel injection valve 1.
  • the anchor abutment surface 38 is provided with a coating 40 which, on the one hand, protects the anchor abutment surface 38 and a corresponding abutment surface 39 from wear on the inner pole 13 and, on the other hand, by means of its special surface structure 41 for a rapid outflow of the fuel when the armature 20 is energized when the magnet coil 10 is energized ensures and thus does not interfere with the opening process of the fuel injection valve 1.
  • the cavitation of the anchor stop surface 38 and the stop surface 39 of the inner pole 13 is reduced, since the fuel is not swirled.
  • the surface structure 41 in this case has raised and recessed areas 42, 43, which are achieved by a corresponding coating method.
  • chromium is used, which is applied in several layers on the anchor stop surface 38 of the armature 20. This results in dome-shaped raised areas 42, between which the recessed areas 43 are formed.
  • the area provided by the alternating raised and recessed areas 42, 43 as the anchor abutment surface 38 is expected to be smaller than a closed anchor abutment area 38 so that reduced hydraulic adhesion between the anchor abutment area 38 and the abutment area 39 of the mecanicpols 13 is observed.
  • the surface structure 41 becomes as shown in FIG Fig. 2B can be seen after an initial phase in continuous operation so far removed that sets a stable surface structure 41 with subsequent very low wear (shrinkage), which nevertheless still has the recessed serving as drainage areas 43.
  • the height difference which between the elevated and the Recessed areas 42, 43 before shrinking, lies between 5 and 10 microns and decreases according to the typical wear depths of about 4 to 5 microns.
  • the invention is not limited to the illustrated embodiment and also in a variety of other designs of fuel injection valves realized.
  • the coating 40 may, for. B. alternatively or additionally be provided on the abutment surface 39 of the inner pole 13.

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)
  • Fuel-Injection Apparatus (AREA)

Claims (5)

  1. Soupape d'injection de carburant (1) pour des installations d'injection de carburant de moteurs à combustion interne, comprenant une bobine magnétique (10), une armature (20) précontrainte dans une direction de fermeture par un ressort de rappel (23) et une aiguille de soupape (3) en liaison par engagement par force avec l'armature (20), sur laquelle est réalisé un corps de fermeture de soupape (4), qui forme conjointement avec une surface de siège de soupape (6) un siège d'étanchéité, l'armature (20) butant avec une surface de butée d'armature (38) contre une surface de butée (39) d'un pôle intérieur (13) de la bobine magnétique (10) et la surface de butée d'armature (38) et/ou la surface de butée (39) étant munies d'un revêtement (40), le revêtement (40) présentant une structure de surface (41) avec des régions rehaussées (42) et des régions renfoncées (43),
    caractérisée en ce que
    les régions rehaussées (42) sont réalisées en forme de calottes.
  2. Soupape d'injection de carburant selon la revendication 1,
    caractérisée en ce
    qu'une différence de hauteur entre les régions rehaussées et les régions renfoncées (42, 43) est dimensionnée de telle sorte qu'elle soit supérieure à un enlèvement des régions rehaussées (42) se produisant sous l'effet d'une précontrainte.
  3. Soupape d'injection de carburant selon la revendication 2,
    caractérisée en ce que
    la différence de hauteur est comprise entre 5 µm et 10 µm.
  4. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 3,
    caractérisée en ce que
    le revêtement (40) se compose de chrome.
  5. Soupape d'injection de carburant selon la revendication 4,
    caractérisée en ce que
    le revêtement (40) est constitué de plusieurs couches de chrome.
EP03812120.8A 2002-12-04 2003-07-02 Soupape d'injection de carburant Expired - Lifetime EP1570170B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10256662 2002-03-04
DE10256662A DE10256662A1 (de) 2002-12-04 2002-12-04 Brennstoffeinspritzventil
PCT/DE2003/002211 WO2004051072A1 (fr) 2002-12-04 2003-07-02 Soupape d'injection de carburant

Publications (2)

Publication Number Publication Date
EP1570170A1 EP1570170A1 (fr) 2005-09-07
EP1570170B1 true EP1570170B1 (fr) 2014-04-16

Family

ID=32318943

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03812120.8A Expired - Lifetime EP1570170B1 (fr) 2002-12-04 2003-07-02 Soupape d'injection de carburant

Country Status (6)

Country Link
US (2) US8020789B2 (fr)
EP (1) EP1570170B1 (fr)
JP (1) JP2006509140A (fr)
CN (1) CN100432418C (fr)
DE (1) DE10256662A1 (fr)
WO (1) WO2004051072A1 (fr)

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Also Published As

Publication number Publication date
CN1714235A (zh) 2005-12-28
WO2004051072A1 (fr) 2004-06-17
US8656591B2 (en) 2014-02-25
US20110305823A1 (en) 2011-12-15
EP1570170A1 (fr) 2005-09-07
DE10256662A1 (de) 2004-06-17
CN100432418C (zh) 2008-11-12
US20060151639A1 (en) 2006-07-13
JP2006509140A (ja) 2006-03-16
US8020789B2 (en) 2011-09-20

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