EP1012472A1 - Soupape d'injection de carburant et procede de montage de ladite soupape - Google Patents

Soupape d'injection de carburant et procede de montage de ladite soupape

Info

Publication number
EP1012472A1
EP1012472A1 EP99910094A EP99910094A EP1012472A1 EP 1012472 A1 EP1012472 A1 EP 1012472A1 EP 99910094 A EP99910094 A EP 99910094A EP 99910094 A EP99910094 A EP 99910094A EP 1012472 A1 EP1012472 A1 EP 1012472A1
Authority
EP
European Patent Office
Prior art keywords
valve
valve seat
fuel injection
opening
disc
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.)
Withdrawn
Application number
EP99910094A
Other languages
German (de)
English (en)
Inventor
Günter DANTES
Detlef Nowak
Jörg HEYSE
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 EP1012472A1 publication Critical patent/EP1012472A1/fr
Withdrawn legal-status Critical Current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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • 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
    • F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1853—Orifice plates

Definitions

  • the invention relates to a fuel injector according to the preamble of claim 1 and a method for assembling a fuel injector according to the preamble of claim 12.
  • Valve seat plate opposite side.
  • the valve plate is surrounded by the swirl element with great play; the swirl element thus performs a certain guidance of the valve plate.
  • Several tangential grooves are made in the swirl element on its lower end face, which extend from the outer circumference to a medium swirl chamber. Due to the fact that the lower end face of the swirl element rests on the valve seat plate, the grooves are present as swirl channels.
  • a multi-disc atomizing attachment with a swirl preparation is arranged at the downstream end of which a multi-disc atomizing attachment with a swirl preparation is arranged.
  • This atomizing attachment is also provided on the valve seat support downstream of a disk-shaped guide element installed in a valve seat carrier and a valve seat, an additional support element holding the atomizing attachment in a defined position.
  • the atomizing attachment is designed with two or four disks, the individual disks being made from stainless steel or silicon. Accordingly, conventional machining methods such as eroding, punching or etching are used in the manufacture of the opening geometries in the panes.
  • Each individual disc of the atomizing attachment is manufactured separately, after which, in accordance with the desired number of disks, all of the same size disks are stacked on top of one another to form the complete atomizing attachment.
  • the atomizing attachment is installed from the downstream, spray-side end of the valve. From this side, the guide element, the valve seat element, the atomizing attachment and the support element are inserted into the stepped through-opening of the valve seat carrier up to a stop. This entire component complex is retained in the valve seat carrier in that an end region of the valve seat carrier is subsequently folded over by means of flanging or bending.
  • valve seat element can be inserted in the spraying direction into an attachment body that can be screwed onto the valve housing.
  • the valve seat element rests on a shoulder of the attachment body and is therefore at least partially gripped by the attachment body.
  • the front body is screwed onto the valve housing in the opposite direction to the spray direction until the valve seat element comes to rest against a swirl insert arranged upstream of it.
  • the fuel injector according to the invention with the characterizing features of claim 1 has the advantage that with it a very high atomization quality of a fuel to be sprayed off as well as a very variably configurable jet or spray shaping adapted to the respective requirements (e.g. installation conditions, engine configurations, cylinder shapes, spark plug position) is achieved.
  • a very high atomization quality of a fuel to be sprayed off as well as a very variably configurable jet or spray shaping adapted to the respective requirements (e.g. installation conditions, engine configurations, cylinder shapes, spark plug position) is achieved.
  • the exhaust gas emission can be reduced with a corresponding one - 4 -
  • Fuel injection valves equipped internal combustion engine reduced and also a reduction in fuel consumption can be achieved.
  • the atomizer disc is produced in a particularly advantageous manner by means of multilayer electroplating. Due to their metallic design, the atomizer disks are very unbreakable and easy to assemble. The use of multilayer electroplating allows extremely great freedom of design, since the contours of the opening areas (inlet areas, swirl channels, swirl chamber, outlet opening) can be freely selected in the atomizer disc. This flexible design is particularly advantageous in comparison to silicon wafers, in which the contours that can be achieved due to the crystal axes are strictly specified (truncated pyramids).
  • Metallic deposition has the advantage of a very large variety of materials, especially when compared to the production of silicon wafers.
  • Hardening can be used in the micro electroplating used to manufacture the atomizing disks.
  • the swirl generation layer is formed by one or more material areas which, on account of their contouring and their geometric position relative to one another, define the contours of the swirl chamber and the swirl channels. Due to the electroplating process, the individual layers are without
  • the material areas can have very different shapes depending on the desired contour of the swirl channels, e.g. web-like or spiral.
  • the method according to the invention for assembling a fuel injector with the characterizing features of claim 12 has the advantage of a particularly simple attachment of an atomizer disc to the downstream valve end.
  • An atomizer disc can be securely fixed without welding seams.
  • the outer contour of a valve seat support, which partially forms a valve housing, can be designed in a particularly simple and compact manner with a base area used for receiving valve components.
  • FIG. 1 shows a partially illustrated fuel injector in section with an atomizer disc at the downstream valve end
  • FIG. 2 shows a section along the line II-II in FIG. 1
  • FIG. 3 shows a second exemplary embodiment of a downstream valve end
  • FIG. 4 shows a third exemplary embodiment of a downstream valve end
  • FIG 5 shows a fourth exemplary embodiment of a downstream valve end
  • FIG. 6 shows a fifth exemplary embodiment of a downstream valve end
  • FIG. 7 shows a section along the line VII-VII in FIG. 6.
  • the electromagnetically actuated valve in the form of an injection valve for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines shown by way of example and in simplified form in FIG. 1, has a tubular, largely hollow-cylindrical core 2, which is at least partially surrounded by a magnetic coil 1 and serves as the inner pole of a magnetic circuit.
  • the fuel injection valve is suitable is particularly suitable as a high-pressure injection valve for the direct injection of fuel into a combustion chamber of an internal combustion engine.
  • valve housing is at least partially formed by an elongated, stepped valve seat support 9, in the inner passage opening 10 of which an axially movable valve part is provided.
  • This valve part consists at least of an armature 11 and a rod-shaped valve needle 12 which is enclosed by the valve seat support 9.
  • the valve seat support 9 is part of a valve housing and formed concentrically to the valve longitudinal axis 8.
  • the valve part can also be designed, for example, in the form of a flat disk with an integrated armature.
  • the through opening 10 is designed at least once, but expediently in multiple steps, the cross section of the through opening 10 being reduced with each step when viewed in the direction of flow.
  • Atomizer disc 30 is arranged, the atomizer disc 30 following the valve seat element 13 downstream.
  • the valve seat element 13 has a valve seat surface 15 which tapers in the shape of a truncated cone downstream.
  • the valve needle 12 has at its downstream end a valve closing section 16. This, for example, hemispherically rounded valve closing section 16 interacts in a known manner with the valve seat surface 15 for opening and closing the valve.
  • the injection valve is actuated electromagnetically, for example, in a known manner.
  • the indicated electromagnetic circuit with the magnet coil 1, the core 2 and the armature 11 is used for the axial movement of the valve needle 12 and thus for opening against the spring force of a return spring (not shown) or closing the injection valve.
  • the armature 11 is facing away from the valve closing section 16 End of the valve needle 12 z. B. connected by a weld and aligned to the core 2. - 8th -
  • another excitable actuator such as a piezo stack can be used in a comparable fuel injection valve or the actuation of the axially movable valve part can be carried out by means of hydraulic pressure or servo pressure.
  • the stroke of the valve needle 12 is i.a. predetermined by the valve seat surface 15.
  • An end position of the valve needle 12 is when the solenoid 1 is not energized by the contact of the valve closing section 16 on the
  • Valve seat surface 15 fixed, while the other end position of the valve needle 12 results when the magnet coil 1 is excited by the contact of the armature 11 on the downstream end face of the core 2.
  • the surfaces of the components in the latter stop area are chromed, for example.
  • the atomizer disk 30 installed according to the invention is referred to in the exemplary embodiments because of its geometry and its special mode of operation as a swirl disk 30.
  • the swirl disk 30 is e.g. produced by means of multilayer electroplating and comprises three metallic layers deposited on one another.
  • a basic variant provides that only the valve seat element 13 and the swirl disk 30 are installed in the passage opening 10 in the downstream valve end. Both components 13 and 30 are largely formed with the same outer diameter as the inner diameter of the through opening 10.
  • the swirl disk 30 rests on a lower shoulder 18 of the valve seat support 9, which reduces the cross section the through opening 10 results.
  • the shoulder 18 is part of a bottom region 17 of the valve seat support 9 that extends at least partially transversely to the longitudinal axis 8 of the valve Valve brought in and assembled. Due to the design of the base area 17, through which at least one shoulder 18 is formed, and the support and assembly aid thus created, installation from the spray side of the valve is excluded.
  • the sealing element 19 is designed with the same outer diameter as the inner diameter of the through opening 10. Particularly suitable materials for the sealing element 19 are aluminum, copper, nickel or Teflon®.
  • the through opening 10 downstream in the opening width which is reduced in its opening width, accommodates both the swirl disk 30 and a support element 20.
  • the support element 20 is, for example, stepped on its outer contour and is seated with a corresponding step on a further shoulder 22 of the base region 17 in the lower section 21 of the through opening 10. In - lo ⁇
  • the support element 20 is a dimensionally accurate installation part.
  • the swirl disk 30 lies on the upper end face 24 of the support element 20, the swirl disk 30 being partially fitted into the lower section 21 of the through opening 10.
  • the sealing element 19 presses from the side facing away from the support element 20 at least onto the outer edge region of the swirl disk 30.
  • An outlet opening 26 is formed in the support element 20, which e.g. is introduced by punching or eroding and through which the now swirling fuel leaves the fuel injector.
  • valves For gasoline direct injection, for example due to certain installation conditions directly on the combustion chamber, it is advantageous to inject valves that spray a spray that is inclined to the longitudinal axis 8 of the valve. For example, a swirled, possibly rotationally symmetrical hollow cone spray with a uniform distribution over the hollow cone circumference is generated.
  • FIG. 1 A possible design variant for generating an inclined spray is shown in FIG. 1, in which the outlet opening 26 in the support element 20 is introduced at an incline to the longitudinal axis 8 of the valve.
  • the outlet opening 26 begins, for example, in the middle on the upper end face 24 and ends off-center on the lower end face 34 of the support element 20, the inclination of the outlet opening 26 determining the jet angle of the overall spray to the valve longitudinal axis 8.
  • the jet alignment is indicated by an arrow and ⁇ , where ⁇ indicates the angle of the spray to the valve longitudinal axis 8. - 11 -
  • the swirl disk 30 is a one-piece component, since the individual layers are directly galvanically deposited on one another (multi-layer electroplating) and are not joined subsequently. The subsequent layer is firmly bonded to the layer below due to galvanic adhesion.
  • the swirl disk 30 is formed here from three galvanically deposited planes, layers or layers, which thus follow one another directly in the flow direction in the installed state.
  • a multiplicity of swirl disks 30 can be produced simultaneously on a panel or wafer.
  • FIG. 2 shows a section along the line II -II in FIG. 1 through the valve needle 12 with a view of a guide element 28 which, in addition to guiding the axially movable valve needle 12, also serves as a gill means for the entire installation complex in the through opening 10.
  • a guide element 28 which, in addition to guiding the axially movable valve needle 12, also serves as a gill means for the entire installation complex in the through opening 10.
  • a first guide of the axially movable valve part with the armature 11 takes place, a second lower guide is ensured in an inner guide opening 29 of the guide element 28.
  • the guide element 28 is designed, for example, in the shape of a triangle, the three edge regions having a certain areal extent and thus representing three slightly curved clamping surfaces 35.
  • FIGS. 3 to 7 show further exemplary embodiments of the valve ends designed according to the invention with swirl disks 30, the basic structure of which corresponds to the downstream valve end in FIG. 1.
  • the parts that remain the same or have the same effect as the exemplary embodiment shown in FIG. 1 are identified by the same reference numerals and are no longer explained in more detail. In the following it is only pointed out differences and special features.
  • Support element 20 can also be dispensed with.
  • the swirl disk 30 thus lies directly with its lower layer on the lower shoulder 22 of the base region 17.
  • the outlet opening 26 now represents the downstream end of the passage opening 10 in the bottom region 17, which extends either with a vertical wall or with a wall that widens conically downstream (FIG. 3) concentrically to the longitudinal valve axis 8 or inclined obliquely to the longitudinal valve axis 8, as in FIG 1, runs.
  • FIGS. 4 and 5 show two embodiments of atomizer disks in the form of swirl disks 30, which are not produced by means of multilayer electroplating.
  • the swirl disks 30 are formed by at least two sheet metal layers 41, 42, 43 stacked one on top of the other, so that one can speak of so-called sheet metal laminate disks.
  • These swirl disks 30 are designed, for example, with an outer diameter such that they rest on the support element 20 over a large area and that the disk-shaped one
  • Sealing element 19 can act in the outer edge region of the swirl disks 30 between the valve seat element 13 and the swirl disk 30.
  • Methods such as eroding, stamping, embossing or etching are used in the production of the sheet metal layers 41, 42, 43.
  • the individual sheet layers are attached to one another to form sheet metal laminate atomizing disks, e.g. by means of embossing, flanging, laser stitching, laser welding, diffusion soldering, brazing or gluing.
  • a two-layer swirl disk 30 is provided, an upper sheet-metal layer 41 facing the valve seat 15 in one - 14 -
  • middle pane area is spaced from the lower sheet layer 43.
  • the space formed between the two sheet metal layers 41, 43 in the middle pane area forms a swirl chamber 44 which is supplied via a plurality of inflow openings 45 made in the upper sheet metal layer.
  • the swirling fuel emerges from the swirl disk 30 via an outlet opening 46 formed in the lower sheet-metal layer 43 and immediately thereafter enters the outlet opening 26 of the support element 20 or of the base region 17 of the valve seat support 9.
  • FIG. 5 shows a valve end in which a three-layer swirl disk 30 is provided. Another sheet metal layer 42 is introduced between the upper sheet metal layer 41 and the lower sheet metal layer 43. While in the top
  • Sheet metal layer 41 a plurality of inflow openings 45 and an outlet opening 46 are provided in the lower sheet metal layer 43, the middle sheet metal layer 42 has an opening structure which consists of swirl channels and a swirl chamber 44.
  • the swirl channels open tangentially into the swirl chamber 44 in order to apply swirl to the fuel.
  • the support element 20 or the valve seat support 9 is provided with an outlet opening 26 with which a direct influence on the flow of the swirling fuel emerging from the swirl disk 30 is achieved.
  • the beam shaping is carried out in a very simple manner.
  • the static flow rate and the jet parameters relating to the jet angle are set separately from one another by the geometric arrangement.
  • the static flow rate is set with the - 15 -
  • FIGS. 6 and 7 show a further example of a valve end, FIG. 7 being a section along the line VII-VII in FIG. 6.
  • the valve end in FIG. 6 is only shown in a simplified manner and is only intended to clarify the basic installation concept which corresponds to that of all the exemplary embodiments described above.
  • the swirl disk 30 and the valve seat element 13 are introduced into the valve seat support 9 from the upstream direction, since the lower base region 17 does not permit the installation of these valve parts from the spraying side due to its transverse extension.
  • the valve seat support 9 is designed without steps in the example according to FIG. 6. Instead, the bottom region 17 is folded over in the form of a ring collar.
  • the valve seat element 13 has on its lower end face 49 a plurality of radially extending grooves 50, which run in a star shape and through which a radial expansion of the fuel is achieved. In the central area of the end face 49, a slight depression 48 is provided, into which the swirl disk 30 is inserted in a dimensionally accurate and centered manner.
  • the two components are connected to one another. With the aid of a suction tool acting from the side facing away from the base region 17, the swirl disk 30 can also be held on the valve seat element 13 in order to facilitate assembly.
  • Swirl disk 30 ultimately comes to rest against an inner annular end region 57 of base region 17, which e.g. is designed like a hook.
  • valve seat element 13 swirl disk 30 is pressed somewhat into raised end region 57.
  • the sealing of the swirl disk 30 which can be achieved in this way is sufficient so that additional sealing elements can be dispensed with. Since the swirl disk 30 lies clearly within its outer circumference on the end region 57 of the valve seat support 9, the risk of deflection of the swirl disk 30 is reduced when a high fuel pressure is applied.
  • a pressure-tight connection of valve seat element 13 and valve seat support 9 is e.g. thereby achieved that over the scope in
  • an adhesive e.g. a capillary Locktite adhesive is applied.
  • a circumferential weld seam can also be applied.
  • the swirl disk 30 has, for example, three layers 51, 52, 53 which are produced by means of multilayer electroplating and are deposited on one another.
  • the upper layer 51 is a cover layer without opening structures, which thus completely covers the swirl chamber 44 underneath it and allows radial flow to the outside through the grooves 50.
  • the middle layer 52 is designed as a swirl generation layer, in which a plurality of spaced-apart material areas 52 ′ are provided, which determine the dimensions of the inner swirl chamber 44 and of swirl channels 55 opening into them by their contours. The fuel passes into the swirl channels 55 - 17 -
  • the material areas 52 ' are, for example, teardrop-shaped, scoop-like, web-shaped or spiral-shaped.
  • the lower layer 53 has only the outlet opening 46, from which the fuel immediately reaches the outlet opening 26 of the valve seat support 9.
  • swirl disks 30 of which only a single one of a very large number of possible design variants is shown in FIG. 7, other types of multi-layer or multi-layer atomizer disks, such as e.g. having an offset of inlet and outlet and thus producing a so-called S-type washer, which can be made of metal as multilayer electroplated or sheet metal laminate washers.

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

L'invention concerne une soupape d'injection de carburant caractérisée en ce qu'elle présente un disque de turbulence multicouche (30) placé en aval d'un siège de soupape (15) formé sur un élément à siège de soupape (13). Au moins ces deux composants sont intégrés, dans la direction côté afflux, dans une ouverture de passage (10) d'un support de siège de soupape (9). Ce dernier (9) présente une zone de fond (17) inférieure qui assure un rétrécissement de la section transversale de l'ouverture de passage (10) en aval du siège de soupape (15). Cette soupape d'injection de carburant s'utilise notamment pour l'injection directe de carburant dans une chambre de combustion d'un moteur à combustion interne, à allumage commandé et à compression du mélange.
EP99910094A 1998-04-08 1999-01-29 Soupape d'injection de carburant et procede de montage de ladite soupape Withdrawn EP1012472A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19815780 1998-04-08
DE19815780A DE19815780A1 (de) 1998-04-08 1998-04-08 Brennstoffeinspritzventil und Verfahren zur Montage eines Brennstoffeinspritzventils
PCT/DE1999/000229 WO1999053190A1 (fr) 1998-04-08 1999-01-29 Soupape d'injection de carburant et procede de montage de ladite soupape

Publications (1)

Publication Number Publication Date
EP1012472A1 true EP1012472A1 (fr) 2000-06-28

Family

ID=7864016

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99910094A Withdrawn EP1012472A1 (fr) 1998-04-08 1999-01-29 Soupape d'injection de carburant et procede de montage de ladite soupape

Country Status (6)

Country Link
US (1) US6405935B2 (fr)
EP (1) EP1012472A1 (fr)
JP (1) JP2002503313A (fr)
KR (2) KR20010013242A (fr)
DE (1) DE19815780A1 (fr)
WO (1) WO1999053190A1 (fr)

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Also Published As

Publication number Publication date
JP2002503313A (ja) 2002-01-29
DE19815780A1 (de) 1999-10-14
US20010048035A1 (en) 2001-12-06
US6405935B2 (en) 2002-06-18
KR20010013513A (ko) 2001-02-26
WO1999053190A1 (fr) 1999-10-21
KR20010013242A (ko) 2001-02-26
KR100681159B1 (ko) 2007-02-09

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