EP0877860B1 - Brennstoffeinspritzventil - Google Patents

Brennstoffeinspritzventil Download PDF

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Publication number
EP0877860B1
EP0877860B1 EP97944733A EP97944733A EP0877860B1 EP 0877860 B1 EP0877860 B1 EP 0877860B1 EP 97944733 A EP97944733 A EP 97944733A EP 97944733 A EP97944733 A EP 97944733A EP 0877860 B1 EP0877860 B1 EP 0877860B1
Authority
EP
European Patent Office
Prior art keywords
fuel
bead
injection valve
groove
fuel injection
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
EP97944733A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0877860A1 (de
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 EP0877860A1 publication Critical patent/EP0877860A1/de
Application granted granted Critical
Publication of EP0877860B1 publication Critical patent/EP0877860B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • 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
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S239/00—Fluid sprinkling, spraying, and diffusing
    • Y10S239/23—Screens
    • 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
    • Y10T137/00—Fluid handling
    • Y10T137/794—With means for separating solid material from the fluid
    • Y10T137/8085—Hollow strainer, fluid inlet and outlet perpendicular to each other

Definitions

  • the invention relates to a fuel injector of the genus Claim 1. It is already from US 4,946,107 A, which forms the closest prior art, a fuel injector is known in which a fuel filter at the inlet end of the fuel injector is inserted into the fuel inlet port. It snaps into the inlet end of the fuel inlet connector provided inside projection in a Shell surface of the fuel filter provided groove to the fuel filter on the Lock the fuel inlet connector.
  • the fuel inlet port has one Step bore on, the step a stop for the fuel filter to be used offers.
  • the inlet end of the fuel inlet connector is radial outstanding retaining collar provided on the inlet side of the Fuel inlet connector also strikes. This prevents the Fuel filter penetrates too far into the fuel inlet connection.
  • the known Fuel injector has several disadvantages. Those in the fuel inlet port provided step bore and the formation of in the groove of the fuel filter latching projection require a machining manufacturing process, so that no insignificant manufacturing effort exists to the fuel inlet port Prepare the intake of the fuel filter. On the other hand, training the Retaining collar on the fuel filter is a relatively complex injection molded part for the production of the fuel filter in a plastic injection molding process.
  • a fuel injector in which the Fuel filter is pressed into the fuel inlet port.
  • This fuel filter is on For example, provided with a brass ring around the circumference of the Fuel inlet connector forms a pair when the fuel filter is pressed in.
  • Pressing in the fuel filter provided with a brass ring exists Danger of abrasion and chips, due to the compressive stress between Fuel filter and fuel inlet connector can be detached and contaminants can cause in the fuel injector.
  • the fuel injector according to the invention with the features of Claim 1 has the advantage that the fuel filter and Fuel inlet ports are made particularly cost and material saving.
  • a particular advantage is that the seal between the fuel filter and the fuel inlet nozzle is guaranteed even when the Fuel filter due to a chemical or physical interaction with the fuel flowing through the fuel filter shrinks or swells.
  • This is through the special shape of the groove provided on the holding section of the fuel filter and achieved in the groove engaging bead of the fuel inlet connector.
  • the bead points thereby at least one, usually two, beveled flank area (s), whereby the opening cross section of the fuel inlet connector in the area of the beveled Flank areas continuously narrowed or expanded.
  • the bead by means of a non-cutting Manufacturing process can be molded onto the fuel inlet nozzle.
  • the bead can e.g. B. be pressed into the fuel inlet port by rolling.
  • a cutting Machining the fuel inlet port e.g. by turning this for recording preparing the fuel filter is not necessary.
  • the fuel filter can consist entirely of a plastic material and e.g. by means of a plastic injection molding process getting produced. The insertion or attachment of metal parts is not required.
  • the groove cooperating with the bead of the fuel inlet connector can be formed in the manufacture of the fuel filter with, without a additional processing step is required. This can result in manufacturing costs in to be saved considerably.
  • FIG. 1 shows a fuel injector with a fuel filter according to the invention
  • FIG. 2 an enlarged view of Fig. 1 in the area of the fuel filter
  • Fig. 3 is a 2 in the area of the locking connection between the Fuel filter and the fuel inlet connector
  • Fig. 4, 5 and 6 alternative Embodiments of the locking connection between the fuel filter and the Fuel inlet connector.
  • the electromagnetically actuated valve shown in FIG. 1 in the Form of an injection valve for fuel injection systems of mixture-compressing, spark-ignition internal combustion engines has one surrounded by a magnet coil 1 tubular core 2.
  • a bobbin 3 stepped in the radial direction takes one Winding of the magnetic coil 1 and in connection with the core 2 enables one particularly compact design of the injection valve in the area of the solenoid coil 1.
  • a tubular metal intermediate part 12 tightly, for example by welding connected and thereby partially surrounds the core end 9 axially.
  • the stepped bobbin 3 partially overlaps the core 2 and with a step 15 of larger diameter that Intermediate part 12 at least partially axially.
  • a tubular valve seat carrier 16 extends between part 12 and is fixed, for example is connected to the intermediate part 12.
  • a tubular valve needle 19 which their downstream end 20 with a spherical valve closing body 21 its circumference, for example, five flats 22 for the fuel to flow past are provided, for example connected by welding.
  • the injection valve is actuated electromagnetically in a known manner.
  • For axial movement of the valve needle 19 and thus to open against the spring force of a Return spring 25 or closing the injection valve serves the electromagnetic circuit with the magnet coil 1, the core 2 and an armature 27.
  • the armature 27 is with the Valve closing body 21 facing away from the end of the valve needle 19 by a first weld 28 connected and aligned to the core 2.
  • In the downstream core 2 opposite end of the valve seat carrier 16 is a cylindrical in the longitudinal bore 17 Valve seat body 29, which has a fixed valve seat, tightly mounted by welding.
  • valve closing body 21 To guide the valve closing body 21 during the axial movement of the valve needle 19 with the armature 27 along the longitudinal valve axis 10, a guide opening 32 of the Valve seat body 29.
  • the spherical valve closing body 21 acts with the in Direction of flow of a frusto-conical valve seat of the valve seat body 29 together.
  • the circumference of the valve seat body 29 is slightly smaller Diameter on than the longitudinal bore 17 of the valve seat support 16.
  • the valve seat body 29 At its Valve closing body 21 facing away from the end face is the valve seat body 29 with a for example, cup-shaped spray plate 34 concentric and firm, for example by a circumferential density, for example by means of a laser trained second weld 37, connected.
  • the cup-shaped spray orifice plate 34 has in addition to a bottom part 38 on which the Valve seat body 29 is fixed and in which one or more, for example four Eroding or stamping shaped injection orifices 39 run, a circumferential downstream holding edge 40.
  • the holding edge 40 is conical downstream bent outside, so that this is determined by the longitudinal bore 17 inner Wall of the valve seat carrier 16 abuts, there being a radial pressure.
  • Spray plate 34 and valve seat carrier 16 avoided.
  • On the circumference of the valve seat support 16 is a protective cap at its downstream end facing away from the core 2 43 arranged and for example by means of a detent with the valve seat support 16th connected.
  • the insertion depth of the valve seat body 29 with the cup-shaped spray perforated disk 34 determines the presetting of the stroke of the valve needle 19.
  • the magnetic coil 1 is formed by at least one, for example as a bracket and serve as a ferromagnetic guide element 45 surrounding the solenoid 1 at least partially surrounds in the circumferential direction and with one end at the Core 2 and its other end abuts the valve seat carrier 16 and with this to Example can be connected by welding, soldering or gluing.
  • the injection valve is largely enclosed with a plastic encapsulation 50 starting from the core 2 in the axial direction via the magnet coil 1 and that at least one guide element 45 extends to the valve seat support 16, the at least a guide element 45 is completely covered axially and in the circumferential direction.
  • a plastic encapsulation 50 belongs, for example, to an electrical injection molded onto it Connector 52.
  • An upper side surface 54 of the plastic extrusion 50 offers one Support surface for an upper sealing ring 58.
  • the core 2 forms a fuel inlet connector 60 at its inlet end
  • Fuel filter 61 according to the invention is inserted into the fuel inlet connection 60, which can be seen more precisely from the enlarged illustration shown in FIG. 2, and ensures the filtering out of such fuel components, which due to their size in Fuel injector can cause blockages and damage.
  • the one out a plastic material e.g. produced by means of a plastic injection molding process
  • Fuel filter 61 has a circumferential holding section 62.
  • the holding section 62 ends downstream at a shoulder 63.
  • At the holding section 62 are in Embodiment three extending in the axial direction and 120 ° on the circumference of the Fuel filter 61 integrally formed webs 64 formed on the downstream End of the fuel filter 61 are connected to one another via the filter base 65.
  • the Filtering of the filter element serving the fuel flowing through the fuel filter 61 66 is thus surrounded by the holding section 62, the webs 64 and the filter base 65 and can be e.g. consist of a polyamide fabric, which in Fuel filter 61 is injected during manufacture.
  • the fuel inlet connection 60 has a preferably circumferential, bulge 67 inward.
  • the bead 67 is preferably not by means of a machining manufacturing process, as this is particularly inexpensive.
  • the bead 67 can e.g. be formed in that the fuel inlet port 60 on a rail-like stamp rolls so that the bead 67 is pressed inwards and itself at the same time forms a groove 68 on the outside.
  • later overmolding with the Plastic encapsulation 50 also has the advantage that the plastic encapsulation 50 adheres better due to the groove 68 in the area of the fuel inlet connector 60.
  • the holding section 62 has a groove 69 which interacts with the bead 67 and which is preferably circumferentially formed in the holding section 62 of the fuel filter 61.
  • the groove 69 can already be in the manufacture of the fuel filter 61 by means of a Plastic injection molding process can be molded without using a separate Manufacturing step required.
  • the bead 67 is formed in a wave shape in the embodiment shown in FIG. 3 and has an upstream, beveled flank area 80 and one downstream, beveled flank area 81.
  • In the upstream, beveled flank area 80 narrows the opening cross section of the Fuel inlet port 60 in the flow direction of the fuel continuously while the opening cross section of the fuel inlet connector 60 in the downstream, beveled flank area 81 continuously expanded.
  • the groove 69 is in the Holding section 62 shaped so that the holding section 62 ideally on two line-shaped, annular circumferential contact points 82 and 83 at the beveled flank areas 80 and 81 of the bead 67 rests.
  • the gap is divided into a first gap area 84a between the Touch points 82 and 83, a second gap region 84b upstream of the Touch 82 and a third gap region 84c downstream of the touch 83.
  • the above-described, inventive formation of the bead 67 and the groove 69 has the advantage that the sealing end between the holding portion 62 of the Fuel filter 61 and the fuel inlet port 60 is maintained even if the plastic material of the fuel filter 61, in particular the holding section 62, due to a chemical or physical interaction with the one to be filtered Fuel shrinks or stretches (e.g. due to swelling).
  • the holding portion 62 expands during the operation of the fuel injector, the contact points 82 and 83 are moved outwards, as is done by the radially acting pair of forces AA is indicated in Fig. 3.
  • the lengthens Gap area 84a and gap areas 84b and 84c are shortened accordingly.
  • an axial force component which is illustrated by the axial pair of forces BB in FIG. 3, acts on the bead 67 and the contact points 82 and 83 approach each other, so that the gap area 84a shortens and the gap areas 84b and 84c accordingly be extended.
  • the contours of the groove 69 and the bead 67 always touch in a wide expansion or shrinkage area of the holding section 62 at two common contact points 82 and 83.
  • the function described above is achieved in that the cross-sectional contour of the wave-shaped curved bead 67 has at its apex a radius of curvature R 1 which is greater than the radius of curvature R 2 at the apex of the cross-sectional contour of the likewise 69-shaped groove 69.
  • the function according to the invention can also be achieved by other configurations of the Cross-sectional contour of the bead 67 or the cross-sectional contour of the groove 69 in the same or can be achieved in a similar manner.
  • Corresponding alternative exemplary embodiments are shown in 4 to 6 illustrates. In the alternative embodiments of FIGS. 4 to 6, elements that have already been described are provided with the same reference numerals that a description in this regard is unnecessary.
  • the alternative exemplary embodiment shown in FIG. 4 differs from the exemplary embodiment already described with reference to FIGS. 1 to 3 in that the cross-sectional contour of the groove 69 is rectangular.
  • the holding section 62 bears on the two circumferential contact points 82 and 83 on the beveled flanks 80 and 81 of the bead 67.
  • the sealing effect at these contact points 82 and 83 is also maintained in this exemplary embodiment regardless of whether the fuel filter 61, in particular its holding section 62, is subjected to expansion or contraction as a result of the interaction with the fuel.
  • the ratio of the depth a to the width b of the groove 69 can be adapted to the ratio of the axial and radial expansion or shrinkage depending on the material properties of the plastic used to form the fuel filter 61. The same applies to the ratio of the radii R 1 and R 2 of the embodiment shown in FIGS. 1 to 3.
  • the cross-sectional contour of the groove 69 trapezoidal.
  • the holding section 62 also lies in this exemplary embodiment of the fuel valve 61 at the rotating contact points 82 and 83.
  • the Ratio of the depth a to the width b of the groove 69 can also in this Embodiment to be adapted to the material properties.
  • the cross-sectional contour of the bead 67 essentially trapezoidal with preferably but not necessarily rounded corners.
  • the bead 67 also has in this embodiment an upstream, beveled flank area 80 in which the Opening cross section of the fuel inlet connection 60 in the flow direction of the fuel continuously narrowed and a downstream, beveled flank area 81, in which the opening cross section of the fuel inlet connector 60 in Flow direction of the fuel continuously expanded.
  • the length of the groove 69 is so dimensioned that the holding portion 62 at contact points 82 and 83 on the beveled Flank areas 80 and 81 of the bead 67 rests sealingly.
  • the exemplary embodiments shown are in terms of training of the bead 67 and the groove 69 can be combined with one another as desired. It is also e.g. conceivable, the cross-sectional contour of the bead 67 and / or the groove 69 in the form of a part circle, in particular semicircular. There are various other geometric shapes possible and, depending on the manufacturing process used to form the Bead 67 and preferred to form the groove 69.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP97944733A 1996-11-18 1997-09-23 Brennstoffeinspritzventil Expired - Lifetime EP0877860B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19647587A DE19647587A1 (de) 1996-11-18 1996-11-18 Brennstoffeinspritzventil
DE19647587 1996-11-18
PCT/DE1997/002150 WO1998022707A1 (de) 1996-11-18 1997-09-23 Brennstoffeinspritzventil

Publications (2)

Publication Number Publication Date
EP0877860A1 EP0877860A1 (de) 1998-11-18
EP0877860B1 true EP0877860B1 (de) 2000-09-20

Family

ID=7811961

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97944733A Expired - Lifetime EP0877860B1 (de) 1996-11-18 1997-09-23 Brennstoffeinspritzventil

Country Status (8)

Country Link
US (1) US6019128A (ja)
EP (1) EP0877860B1 (ja)
JP (1) JP2000504387A (ja)
KR (1) KR19990077251A (ja)
CN (1) CN1075166C (ja)
DE (2) DE19647587A1 (ja)
ES (1) ES2151294T3 (ja)
WO (1) WO1998022707A1 (ja)

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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
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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
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
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EP2811152B1 (en) * 2013-06-04 2018-04-18 Continental Automotive GmbH Filter for a fluid injection valve, fluid injection valve and method for producing a filter for a fluid injection valve
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DE102016004584B4 (de) 2016-04-14 2018-06-28 Stefan Blieske Verfahren zur Bearbeitung eines Einspritzventils zum Einspritzen von Kraftstoff in einen Verbrennungsmotor
DE202016002391U1 (de) 2016-04-14 2016-05-20 Stefan Blieske Einspritzventil zum Einspritzen von Kraftstoff in einen Verbrennungsmotor
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US10859051B2 (en) 2018-06-12 2020-12-08 Delphi Technologies Ip Limited Fuel injector with combined calibration tube, fuel filter, and pressure pulsation damping orifice
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Also Published As

Publication number Publication date
KR19990077251A (ko) 1999-10-25
DE19647587A1 (de) 1998-05-20
ES2151294T3 (es) 2000-12-16
US6019128A (en) 2000-02-01
EP0877860A1 (de) 1998-11-18
CN1207159A (zh) 1999-02-03
WO1998022707A1 (de) 1998-05-28
DE59702381D1 (de) 2000-10-26
JP2000504387A (ja) 2000-04-11
CN1075166C (zh) 2001-11-21

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