EP0877860A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant

Info

Publication number
EP0877860A1
EP0877860A1 EP97944733A EP97944733A EP0877860A1 EP 0877860 A1 EP0877860 A1 EP 0877860A1 EP 97944733 A EP97944733 A EP 97944733A EP 97944733 A EP97944733 A EP 97944733A EP 0877860 A1 EP0877860 A1 EP 0877860A1
Authority
EP
European Patent Office
Prior art keywords
fuel
injection valve
bead
fuel injection
groove
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
EP97944733A
Other languages
German (de)
English (en)
Other versions
EP0877860B1 (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 EP0877860A1 publication Critical patent/EP0877860A1/fr
Application granted granted Critical
Publication of EP0877860B1 publication Critical patent/EP0877860B1/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
    • 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 according to the preamble of the main claim.
  • a fuel injector is already known from US Pat. No. 4,946,107, in which a fuel filter is inserted into the fuel inlet connection at the inlet end of the fuel injector.
  • a projection provided on the inside on the inlet-side end of the fuel inlet connector snaps into a groove provided on the lateral surface of the fuel filter in order to lock the fuel filter on the fuel inlet connector.
  • the fuel inlet connector has a stepped bore, the step of which offers a stop for the fuel filter to be used.
  • a retaining collar is provided which projects radially beyond the inlet end of the fuel inlet connector and also abuts the inlet side end face of the fuel inlet connector.
  • the known fuel injector has several disadvantages.
  • the stepped bore provided in the fuel inlet connector and the design of the projection which engages in the groove of the fuel filter require a machining manufacturing process, so that there is no insignificant manufacturing outlay in order to prepare the fuel inlet connector for receiving the fuel filter.
  • 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.
  • the seal between the fuel filter and the inlet end of the fuel inlet connector is particularly affected by the fact that the plastic material of the fuel filter can swell or shrink due to a chemical or physical interaction with the fuel to be filtered, which can significantly affect the fit between the fuel inlet connector and the fuel filter.
  • a fuel injector in which the fuel filter is pressed into the fuel inlet port.
  • This fuel filter is provided on the circumference with a brass ring, for example, which forms a pairing with the wall of the fuel inlet connection when the fuel filter is pressed in.
  • a brass ring for example, which forms a pairing with the wall of the fuel inlet connection when the fuel filter is pressed in.
  • the fuel filter provided with a brass ring is pressed in, there is a risk of the occurrence of abrasion and chips which, due to the compressive stress, between Fuel filter and fuel inlet connector can be detached and can cause contamination in the fuel injector. Again, this can be an unsatisfactory one
  • Fuel inlet port result if the fuel inlet port is made of a different metal that has a different coefficient of thermal expansion than that
  • Another disadvantage is that due to the relatively large pressing forces to be applied when pressing the brass ring of the fuel filter into the fuel inlet port, it is practically impossible to detach the fuel filter from the fuel inlet port.
  • the fuel injector according to the invention with the characterizing features of the main claim has the advantage that the fuel filter and the fuel inlet connector are made particularly cost and material saving.
  • the bead has at least one, usually two, beveled flank area (s), the opening cross section of the fuel inlet connector being in the area of the beveled area
  • Fuel injector possible.
  • the bead can be molded onto the fuel inlet connector using a non-cutting manufacturing process.
  • the bead can e.g. B. be pressed into the fuel inlet port by rolling. Machining of the fuel inlet connection e.g. turning to prepare it for the fuel filter is not necessary.
  • the fuel filter can be made entirely of a plastic material and e.g. be produced by means of a plastic injection molding process. It is not necessary to insert or attach metal parts.
  • the groove cooperating with the bead of the fuel inlet connector can be formed during the production of the fuel filter, without the need for an additional processing step. As a result, manufacturing costs can be saved to a considerable extent.
  • FIG. 1 shows a fuel injector with a fuel filter according to the invention
  • FIG. 2 shows an enlarged view of FIG. 1 in the area of the fuel filter
  • FIG. 3 shows an enlarged view of FIG. 2 in the area of the snap-in connection between the fuel filter and the fuel inlet connector
  • FIGS. 5 and 6 show alternative exemplary embodiments of the latching connection between the fuel filter and the fuel inlet connection. Description of the embodiments
  • the electromagnetically actuated valve for example shown in FIG. 1, in the form of an injection valve for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines has a tubular core 2 surrounded by a magnet coil 1.
  • a coil body 3 which is stepped in the radial direction, takes up and enables the magnet coil 1 to be wound in connection with the core 2, a particularly compact design of the injection valve in the area of the magnetic coil 1.
  • a tubular metal intermediate part 12 is tightly connected concentrically to a longitudinal valve axis 10, for example by welding, and thereby partially surrounds the core end 9 axially.
  • the stepped coil body 3 partially overlaps the core 2 and, with a step 15 of larger diameter, the intermediate part 12 at least partially axially.
  • a tubular valve seat carrier 16 extends downstream of the bobbin 3 and the intermediate part 12 and is, for example, firmly connected to the intermediate part 12.
  • a longitudinal bore 17 runs in the valve seat carrier 16 and is formed concentrically with the longitudinal axis 10 of the valve.
  • a tubular valve needle 19 is arranged, which is connected at its downstream end 20 to a spherical valve closing body 21, on the periphery of which, for example, five flats 22 are provided for the fuel to flow past, for example by welding.
  • the injection valve is actuated electromagnetically in a known manner.
  • the electromagnetic circuit with the magnet coil 1, the core 2 and an armature 27 is used for the axial movement of the valve needle 19 and thus for opening against the spring force of a return spring 25 or closing the injection valve.
  • the armature 27 is with the end facing away from the valve closing body 21
  • Valve needle 19 connected by a first weld 28 and aligned with the core 2.
  • a cylindrical valve seat body 29 which has a fixed valve seat, is tightly mounted in the longitudinal bore 17 by welding.
  • a guide opening 32 of the valve seat body 29 serves to guide the valve closing body 21 during the axial movement of the valve needle 19 with the armature 27 along the valve longitudinal axis 10.
  • the spherical valve closing body 21 interacts with the valve seat of the valve seat body 29 which tapers in the direction of a truncated cone in the direction of flow.
  • the circumference of the valve seat body 29 has a slightly smaller diameter than the longitudinal bore 17 of the valve seat carrier 16.
  • the valve seat body 29 is concentric and firm with an, for example, cup-shaped injection orifice plate 34, for example by a circumferential density, for example by means of a second weld 37 formed by a laser.
  • the pot-shaped spray perforated disk 34 has a circumferential, downstream holding edge 40.
  • the holding edge 40 is conically outward downstream bent so that it bears against the inner wall of the valve seat carrier 16 determined by the longitudinal bore 17, with a radial pressure being present.
  • a direct flow of fuel through an intake line of the internal combustion engine outside the spray openings 39 is also avoided by a third weld 41 between the spray plate 34 and the valve seat carrier 16.
  • a protective cap 43 is arranged on the periphery of the valve seat carrier 16 at its downstream end facing away from the core 2 and is connected to the valve seat carrier 16, for example, by means of a catch.
  • the insertion depth of the valve seat body 29 with the cup-shaped spray orifice plate 34 determines the presetting of the stroke of the valve needle 19.
  • the one end position of the valve needle 19 when the solenoid coil 1 is not energized is determined by the valve closing body 21 resting on the valve seat of the valve seat body 29, while the other end position is fixed the valve needle 19 results when the solenoid coil 1 is excited by the contact of the armature 27 at the core end 9.
  • the magnet coil 1 is surrounded by at least one guide element 45, for example designed as a bracket and serving as a ferromagnetic element, which at least partially surrounds the magnet coil 1 in the circumferential direction and rests with its one end on the core 2 and its other end on the valve seat support 16 this can be connected, for example, by welding, soldering or gluing.
  • at least one guide element 45 for example designed as a bracket and serving as a ferromagnetic element, which at least partially surrounds the magnet coil 1 in the circumferential direction and rests with its one end on the core 2 and its other end on the valve seat support 16 this can be connected, for example, by welding, soldering or gluing.
  • An adjusting sleeve 48 which is pushed into a flow bore 46 of the core 2 concentrically to the longitudinal axis 10 of the valve and is formed, for example, from rolled spring steel sheet, serves to adjust the spring preload of the return spring 25 abutting the adjusting sleeve 48, which in turn is located on the valve needle 19 with its opposite side supports.
  • the injection valve is largely enclosed by a plastic encapsulation 50 which, starting from the core 2, extends in the axial direction from the magnet coil 1 and the at least one guide element 45 to the valve seat support 16, the at least one guide element 45 being completely covered axially and in the circumferential direction.
  • This plastic encapsulation 50 includes, for example, an injection-molded electrical connector 52.
  • An upper side surface 54 of the plastic encapsulation 50 offers a bearing surface for an upper sealing ring 58.
  • the core 2 forms a fuel inlet connection 60 at its inlet end.
  • the fuel filter 61 according to the invention is inserted into the fuel inlet connection 60, which can be seen more clearly from the enlarged illustration shown in FIG. 2, and ensures that such fuel components are filtered out due to their size can cause blockages and damage in the fuel injector.
  • the fuel filter 61 which is produced from a plastic material, for example by means of a plastic injection molding process, has a circumferential holding section 62. The holding section 62 ends downstream at a shoulder 63.
  • three webs 64 are formed on the holding section 62 which run in the axial direction and are offset by 120 ° on the circumference of the fuel filter 61 and which are connected to one another at the downstream end of the fuel filter 61 via the filter base 65 . That the Filtering of the filter element serving the fuel flowing through the fuel filter 61
  • the 66 is thus surrounded by the holding section 62, the webs 64 and the filter bottom 65 and can e.g. consist of a polyamide fabric which is injected in the fuel filter 61 during manufacture.
  • the fuel inlet connection 60 has a preferably circumferential, inwardly curved bead 67.
  • the bead 67 is preferably produced by means of a non-cutting manufacturing process, since this is particularly inexpensive.
  • 67 can e.g. are formed in that the fuel inlet nozzle 60 rolls on a rail-like stamp, so that the bead 67 is pressed inwards and at the same time a groove 68 forms on the outside.
  • this 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 is preferably formed all the way round in the holding section 62 of the fuel filter 61.
  • the groove 69 can already be formed during the manufacture of the fuel filter 61 by means of a plastic injection molding process, without the need for a separate manufacturing step.
  • the tapered region downstream of the shoulder 63 can be easily pushed through the bead 67 until the shoulder 63 abuts the bead 67.
  • a locking lug 70 located between the groove 69 and the shoulder 63 and possibly additional elastic deformation of the bead 67, the bead 67 engages in the groove 69.
  • an area 71 of the holding section 62 upstream of the groove 69 is substantially longer and more solid than the locking lug 70, it can be prevented that the fuel filter 61 slips over the bead 67 by limiting the pressing force acting on the inlet-side end face of the fuel filter 61 by means of a press ram and thus penetrates into the flow bore 46 further than intended.
  • the bead 67 is wave-shaped and has an upstream, beveled flank area 80 and a downstream, beveled flank area 81.
  • the opening cross section of the fuel inlet connector 60 continuously narrows in the direction of flow of the fuel, while the opening cross section of the fuel inlet connector 60 in the downstream, beveled flank area 81 widens continuously.
  • the groove 69 is formed in the holding section 62 in such a way that the holding section 62 rests on the beveled flank areas 80 and 81 of the bead 67 at two ideally linear, annular contact points 82 and 83. Due to the special design of the groove 69 and the bead 67, a gap is created between the contact points 82 and 83 and upstream of the contact point 82 and downstream of the contact point 83, which prevents the holding section 62 of the fuel filter 61 from directly contacting the fuel inlet connection 60 in these areas .
  • the gap is divided into a first gap region 84a between the contact points 82 and 83, a second gap region 84b upstream of the contact point 82 and a third gap region 84c downstream of the contact point 83. Due to the slight elastic deformation of the holding section 62 and / or the fuel inlet connector 60 caused contact pressure is created at the contact points 82 and 83, which prevents fuel from flowing through the gap areas 84a, 84b and 84c bypassing the filter element 66 on the outside of the holding portion 62 of the fuel filter 61 unfiltered or by.
  • the above-described formation of the bead 67 and the groove 69 according to the invention has the advantage that the sealing closure between the holding section 62 of the fuel filter 61 and the fuel inlet connection 60 is maintained even when the plastic material of the fuel filter 61, in particular the holding section 62, is the result a chemical or physical interaction with the fuel to be filtered causes it to shrink or expand (e.g. due to swelling). If the holding section 62 expands during the operation of the fuel injector, the points of contact 82 and 83 are shifted outwards, as indicated by the radially acting pair of forces AA in FIG. 3. The lengthens
  • Gap area 84a and gap areas 84b and 84c are shortened accordingly. Since the
  • 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 range of expansion or shrinkage of the holding section 62 at two common contact points 82 and 83. In the exemplary embodiment shown in FIG.
  • the function described above is achieved in that the cross-sectional contour of the wavy-curved bead 67 has at its apex a radius of curvature Ri 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.
  • FIGS. 4 to 6 Corresponding alternative exemplary embodiments are illustrated in FIGS. 4 to 6.
  • elements which have already been described are provided with the same reference numerals, so that a description in this regard is unnecessary.
  • the alternative embodiment shown in FIG. 4 differs from the embodiment already described with reference to FIGS. 1 to 3 in that the
  • Cross-sectional contour of the groove 69 is rectangular. This one too
  • the holding section 62 bears against the two circumferential contact points 82 and 83 on the beveled flanks 80 and 81 of the bead 67.
  • Fuel is subject to stretching or shrinking.
  • 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 t and R 2 of the embodiment shown in FIGS. 1 to 3.
  • the cross-sectional contour of the groove 69 is trapezoidal.
  • the holding section 62 of the fuel valve 61 bears against the circumferential contact points 82 and 83.
  • the ratio of the depth a to the width b of the groove 69 can also be adapted to the material properties in this embodiment.
  • the cross-sectional contour of the bead 67 is essentially trapezoidal with preferably, but not necessarily, rounded corners.
  • the bead 67 also has an upstream, beveled flank area 80, in which the opening cross section of the fuel inlet connector 60 continuously narrows in the flow direction of the fuel, and a downstream, beveled flank area 81, in which the opening cross section of the fuel inlet port 60 in the flow direction of the fuel continuously expanded.
  • the length of the groove 69 is dimensioned such that the holding section 62 bears in a sealing manner at contact points 82 and 83 on the beveled flank areas 80 and 81 of the bead 67.
  • the exemplary embodiments shown can be combined with one another as desired with regard to the formation of the bead 67 and the groove 69. It is also conceivable, for example, to design the cross-sectional contour of the bead 67 and / or the groove 69 in the form of a part circle, in particular a semicircle. Various other geometrical shapes are possible and, depending on the manufacturing process used, may be preferable for forming the bead 67 and for forming the groove 69.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Dans les soupapes d'injection de carburant de la technique antérieure, un filtre à carburant est introduit ou enfoncé dans l'extrémité côté admission d'une tubulure d'admission de carburant. Une interaction entre le filtre à carburant et le carburant traversant ce dernier peut provoquer un allongement ou un rétrécissement du filtre à carburant, ce qui peut entraîner une diminution de l'étanchéité entre le filtre à carburant et la tubulure d'admission de carburant. La soupape d'injection de carburant de l'invention présente une tubulure d'admission de carburant (60) à l'intérieur de laquelle est formé un renflement (67) comportant des parties de flancs inclinées (80, 81). Une partie de retenue (62) du filtre à carburant (61) présente une gorge (69) qui coopère avec le renflement (67) pour former une liaison à cran d'arrêt. Selon l'invention, la gorge (69) est formée de sorte que la partie de retenue (62) présentant la gorge (69), du filtre à carburant (61) est plaquée de façon étanche contre les parties de flancs inclinées (80, 81) du renflement (67).
EP97944733A 1996-11-18 1997-09-23 Soupape d'injection de carburant Expired - Lifetime EP0877860B1 (fr)

Applications Claiming Priority (3)

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

Publications (2)

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

Family

ID=7811961

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97944733A Expired - Lifetime EP0877860B1 (fr) 1996-11-18 1997-09-23 Soupape d'injection de carburant

Country Status (8)

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

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Publication number Publication date
EP0877860B1 (fr) 2000-09-20
ES2151294T3 (es) 2000-12-16
US6019128A (en) 2000-02-01
KR19990077251A (ko) 1999-10-25
CN1075166C (zh) 2001-11-21
CN1207159A (zh) 1999-02-03
DE59702381D1 (de) 2000-10-26
WO1998022707A1 (fr) 1998-05-28
DE19647587A1 (de) 1998-05-20
JP2000504387A (ja) 2000-04-11

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