EP0934459A1 - Injecteur de carburant - Google Patents

Injecteur de carburant

Info

Publication number
EP0934459A1
EP0934459A1 EP98947359A EP98947359A EP0934459A1 EP 0934459 A1 EP0934459 A1 EP 0934459A1 EP 98947359 A EP98947359 A EP 98947359A EP 98947359 A EP98947359 A EP 98947359A EP 0934459 A1 EP0934459 A1 EP 0934459A1
Authority
EP
European Patent Office
Prior art keywords
swirl
valve seat
valve
fuel injection
guide
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
EP98947359A
Other languages
German (de)
English (en)
Other versions
EP0934459B1 (fr
Inventor
Martin Müller
Stefan Herold
Jochen Riefenstahl
Reinhold BRÜCKNER
Dirk Fischbach
Andreas Eichendorf
Martin BÜHNER
Rainer Norgauer
Jürgen VIRNEKÄS
Peter Schramm
Hans Weidler
Christian Preussner
Thomas Keil
Oliver Kirsten
Ottmar Martin
Wolfgang Leuschner
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 EP0934459A1 publication Critical patent/EP0934459A1/fr
Application granted granted Critical
Publication of EP0934459B1 publication Critical patent/EP0934459B1/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
    • F02M61/162—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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • 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

Definitions

  • the invention relates to a fuel injector according to the preamble of the main claim.
  • Flat armature-acting flat valve plate is lifted from an opposing valve seat plate, which together form a plate valve part.
  • a swirl element is arranged upstream of the valve seat plate, which sets the fuel flowing to the valve seat in a circular rotary movement.
  • a stop plate limits the axial path of the valve plate on the side opposite the valve seat plate.
  • 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 face, which extend from the outer circumference into a central swirl chamber. By laying the swirl element on with its lower end face on the valve seat plate, the grooves are present as swirl channels.
  • a fuel injector is known from EP-OS 0 350 885, in which a
  • Valve seat body wherein a valve closing body arranged on an axially movable valve needle interacts with a valve seat surface of the valve seat body. Upstream of the valve seat surface, a swirl element is arranged in a recess of the valve seat body, which sets the fuel flowing to the valve seat in a circular rotary movement.
  • a stop plate limits the axial path of the valve needle, the stop plate having a central opening which serves to guide the valve needle to a certain extent.
  • the valve needle is surrounded by the opening of the stop plate with great play, since the fuel to be supplied to the valve seat must also pass through this opening.
  • Several tangential grooves are made in the swirl element on its lower end face, starting from the outer circumference into a central one
  • Swirl chamber is enough. Due to the fact that the lower end face of the swirl element rests on the valve seat body, the grooves are present as swirl channels.
  • the fuel injector according to the invention with the characterizing features of the main claim has the advantage that it is inexpensive to manufacture in a particularly simple manner.
  • Swirl element has a very simple structure and is therefore easy to shape.
  • the swirl element only has the task of generating a swirl or rotary movement in the fuel and not causing turbulence in the fluid which is as disruptive as possible. All other valve functions take over other components of the valve. In this way, the swirl element can be optimally processed. Since the swirl element is a single component, no restrictions are to be expected when handling it in the manufacturing process. Compared to swirl bodies on one
  • an inner opening area can be created in the swirl element according to the invention with the simplest means, which extends over the entire axial thickness of the swirl element and from an outer circumferential one
  • the swirl element advantageously dispenses with otherwise complicated grooves, trenches, notches, grooves or channels.
  • the guide element is also easy to produce.
  • the guide element only serves to guide the valve needle projecting through it in a guide opening. So there is a clear separation of functions from the other two downstream elements.
  • the modular structure of the elements and the associated separation of functions has the advantage that the individual components can be designed very flexibly, so that different sprays to be sprayed (spray angle, static spray quantity) can be generated by simply varying an element.
  • a desired extension of the swirl channels is advantageously achieved by bending or kinking.
  • the Hook-shaped, bent ends of the swirl channels serve as collecting pockets, which form a large-area reservoir for the low-turbulence inflow of the fuel. After the flow has been deflected, the fuel enters the actual tangential swirl channels slowly and with little turbulence, as a result of which a largely trouble-free swirl can be generated.
  • FIG. 1 shows a first exemplary embodiment of a fuel injection valve
  • FIG. 2 shows a first guide and seat area as an enlarged section from FIG. 1
  • FIG. 3 shows a swirl element according to the invention
  • FIG. 4 shows a second guide and seat area
  • FIG. 5 shows a second exemplary embodiment of a fuel injector
  • FIG. 6 a third guide and seat area as an enlarged detail from FIG. 5,
  • FIG. 7 a fourth guide and seat area
  • FIG. 8 a fifth guide and seat area and
  • FIG. 9 a sixth guide and seat area.
  • the electromagnetically actuated valve in the form of an injection valve for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines for example shown in FIG. 1 as an exemplary embodiment, 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 particularly suitable as a high-pressure injection valve for the direct injection of fuel into a combustion chamber of an internal combustion engine.
  • a stepped coil body 3 made of plastic takes up the winding of the magnetic coil 1 and, in conjunction with the core 2 and an annular, non-magnetic intermediate part 4 with an L-shaped cross section partially surrounded by the magnetic coil 1, enables a particularly compact and short structure of the injection valve in the area of the magnetic coil 1.
  • a continuous longitudinal opening 7 is provided in the core 2 and extends along a longitudinal valve axis 8.
  • the core 2 of the magnetic circuit also serves as a fuel inlet connection, the longitudinal opening 7 representing a fuel supply channel.
  • a fuel filter 15 is provided on the inlet side, which ensures that such fuel components are filtered out due to their size in the injector could cause blockages or damage.
  • the fuel filter 15 is, for. B. fixed by pressing in the core 2.
  • the core 2 forms with the housing part 14 the inlet-side end of the fuel injector, the upper housing part 14, for example, just extending beyond the solenoid coil 1, seen downstream in the axial direction.
  • a lower tubular housing part 18 connects tightly and firmly, which, for. B. an axially movable valve part consisting of an armature 19 and a rod-shaped valve needle 20 or an elongated valve seat support 21 encloses or receives.
  • the two housing parts 14 and 18 are, for. B. firmly connected to each other with a circumferential weld.
  • the lower housing part 18 and the largely tubular valve seat support 21 are firmly connected to each other by screwing; Welding, soldering or flanging are also possible joining methods.
  • the sealing between the housing part 18 and the valve seat support 21 is carried out, for. B. by means of a sealing ring 22.
  • the valve seat support 21 has an inner through opening 24 over its entire axial extent, which runs concentrically to the longitudinal axis 8 of the valve.
  • Valve seat support 21 a disk-shaped valve seat element 26 fitted into the through opening 24 with a downstream tapered valve seat surface 27.
  • a largely circular cross-section valve needle 20 is arranged, which has a valve closing section 28 at its downstream end.
  • This, for example, spherical or partially spherical or, as shown in all figures, tapering valve closing section 28 interacts in a known manner with the valve seat surface 27 provided in the valve seat element 26. Downstream of the
  • Valve seat surface 27 is introduced in valve seat element 26 at least one outlet opening 32 for the fuel.
  • the injection valve is actuated electromagnetically in a known manner. For the axial movement of the
  • Valve needle 20 and thus for opening against the spring force of a return spring 33 arranged in the longitudinal opening 7 of the core 2 or closing the injection valve is used for the electromagnetic circuit with the magnet coil 1, the core 2, the housing parts 14 and 18 and the armature 19.
  • the armature 19 is with the valve closing section 28 facing away from the end of the valve needle 20 z. B. connected by a weld and aligned to the core 2.
  • a guide opening 34 provided in the valve seat carrier 21 at the end facing the armature 19 and on the other hand a disk-shaped guide element 35 with an accurate guide opening 55 arranged upstream of the valve seat element 26 19 is surrounded by the intermediate part 4 during its axial movement.
  • An adjusting sleeve 38 inserted, pressed or screwed into the longitudinal opening 7 of the core 2 is used to adjust the spring preload of the return spring 33 which bears against the adjusting sleeve 38 with its upstream side and which is supported with its opposite side on the armature 19 by means of a centering piece 39.
  • one or more bore-like flow channels 40 are provided, through which the fuel can pass from the longitudinal opening 7 in the core 2 via connecting channels 41 formed downstream of the flow channels 40 near the guide opening 34 in the valve seat carrier 21 and into the through opening 24.
  • the stroke of the valve needle 20 is predetermined by the installation position of the valve seat element 26. A final position of the stroke of the valve needle 20 is predetermined by the installation position of the valve seat element 26. A final position of the stroke of the valve needle 20 is predetermined by the installation position of the valve seat element 26.
  • Valve needle 20 is fixed when the magnet coil 1 is not energized by the valve closing section 28 bearing against the valve seat surface 27 of the valve seat element 26, while the other end position of the valve needle 20 when the magnet coil 1 is energized results from the armature 19 resting on the downstream end face of the core 2.
  • the surfaces of the components in the latter stop area are chromed, for example.
  • the electrical contacting of the magnetic coil 1 and thus its excitation takes place via contact elements 43, which are provided outside of the coil former 3 with a plastic encapsulation 44.
  • the plastic encapsulation 44 can also be of other components (z. B. housing parts 14 and 18)
  • Plastic extrusion 44 runs an electrical Connection cable 45, via which the energization of the magnet coil 1 takes place.
  • the plastic encapsulation 44 projects through the upper housing part 14, which is interrupted in this area.
  • FIG. 2 shows the guide and seating area as a detail from FIG. 1 again on a changed scale in order to better illustrate this valve area designed according to the invention.
  • the guide and seat area provided in the discharge-side end 25 of the valve seat carrier 21 in its through opening 24 is basically formed by three axially successive, disk-shaped, functionally separated elements in the exemplary embodiments shown in FIG. 2 and in all other subsequent inventive embodiments.
  • the guide element 35, a very flat swirl element 47 and the valve seat element 26 follow one after the other in the downstream direction.
  • the through opening 24 of the valve seat support 21 is, for example, stepped twice, the diameter of the through opening 24 increasing with each step when viewed in the downstream direction.
  • a first shoulder 49 (FIG. 1) serves as a contact surface for a helical compression spring 50, for example.
  • the second stage 51 creates an enlarged installation space for the three elements 35, 47 and 26.
  • the swirl element 47 has such an outer diameter that it can be fitted tightly into the through opening 24 of the valve seat carrier 21 with little play.
  • the compression spring 50 enveloping the valve needle 20 tensions the three elements 35, 47 and 26 softly in the valve seat support 21, since their side opposite the shoulder 49 presses against the guide element 35. In order to have a secure contact surface on the guide element 35 for the compression spring 50, this is the swirl element 47 facing end face provided with a recess 52, at the bottom 53 of the compression spring 50 rests.
  • the guide element 35 has a dimensionally accurate inner guide opening 55 through which the valve needle 20 moves during its axial movement.
  • the outer diameter of the guide element 35 is selected to be smaller than the diameter of the through opening 24 downstream of the step 51. This guarantees a fuel flow along the outer circumference of the guide element 35 in the direction of the valve seat surface 27.
  • the fuel flows downstream of the guide element 35 directly into the swirl element 47, which is shown in a plan view in FIG. 3.
  • the guide element 35 is e.g. provided with a peripheral chamfer 56.
  • the three elements 35, 47 and 26 lie directly against one another with their respective end faces.
  • valve seat element 26 is connected to the valve seat support 21, the valve seat element 26 is aligned.
  • the valve seat element 26 is made by a tool, for example in the form of a stamp 58, which is only indicated schematically in FIG of the valve seat support 21 is aligned with respect to the longitudinal axis of the valve seat support 21.
  • This welding device stamp 58 has, for example, a number of recesses 59 distributed over the circumference, by means of which the valve seat element 26 is laser-welded to the valve seat carrier 21 at points. After the stamp 58 has been removed, the valve seat element 26 can be welded in all around with a tight weld seam 61.
  • the guide element 35 is again opposite the Valve seat element 26 aligned by means of the valve needle 20 seated on the valve seat surface 27.
  • FIG. 3 shows a swirl element 47 embedded between the guide element 35 and the valve seat element 26 as a single component, which is guided in the through opening 24 with as little play as possible on the circumference.
  • the swirl element 47 can be produced inexpensively, for example by means of stamping, wire EDM, laser cutting, etching or other known methods from a sheet metal or by means of electrodeposition.
  • An inner opening area 60 is formed in the swirl element 47 and extends over the entire axial thickness of the swirl element 47.
  • the opening area 60 is formed by an inner swirl chamber 62, through which the valve closing section 28 of the valve needle 20 extends, and by a plurality of swirl channels 63 opening into the swirl chamber 62.
  • the swirl channels 63 open tangentially into the swirl chamber 62 and, with their ends 65 facing away from the swirl chamber 62, are not connected to the outer circumference of the swirl element 47. Rather, a peripheral edge region 66 remains between the ends 65 of the swirl channels 63 and the outer circumference of the swirl element 47.
  • the swirl chamber 62 is delimited on the inside by the valve needle 20 (valve closing section 28) and on the outside by the wall of the opening area 60 of the swirl element 47. Due to the tangential opening of the swirl channels 63 in the swirl chamber 62 the
  • the fuel is sprayed out in a hollow cone by centrifugal force.
  • a desired extension of the swirl channels 63 is achieved, for example, by bending or kinking.
  • the Hook-shaped bent ends 65 of the swirl channels 63 serve as collecting pockets, which form a reservoir over a large area for the low-turbulence inflow of the fuel. After the flow deflection, the fuel enters the actual tangential swirl channels 63 slowly and with little turbulence, as a result of which a largely trouble-free swirl can be generated.
  • valve seat element 26 Attachment possibility of the valve seat element 26 is provided on the valve seat carrier 21. Since the end 25 of the valve seat carrier 21 is shortened downstream of the stage 51, only the guide element 35 of the three elements 35, 47 and 26 is accommodated in the opening 24 of the valve seat carrier 21. In contrast, the swirl element 47 is located on the end face 82 at the lower end 25 of the valve seat carrier 21.
  • the swirl element 47 formed with a larger outer diameter can advantageously have longer swirl channels 63, so that an even less turbulent one
  • valve seat element 26 Corresponding to the outer diameter of the swirl element 47, the valve seat element 26 also has this enlarged outer diameter.
  • the valve seat element 26 is attached to the valve seat support 21, e.g. by means of a circumferential weld seam 61 on the outside
  • valve seat element 26 The circumference of the valve seat element 26, the weld seam 61 being able to be provided in the region of the swirl element 47, so that the swirl element 47 is welded directly to the valve seat support 21 outside of its swirl channels 63.
  • the valve seat support 21 is made significantly thinner than in the exemplary embodiment shown in FIG. While the compression spring 50 with its lower end on the upper face of the
  • the compression spring 50 rests with its opposite end on a support plate 68.
  • the support disk 68 is fixedly connected to the upper end of the valve seat support 21 by a weld seam. Instead of the connecting channels 41 in
  • valve seat support 21 has the support disk 68 a plurality of axially extending and continuous connecting channels 41.
  • at least one groove-like flow channel 69 is formed on the outer circumference of the guide element 35, which is particularly evident in FIG. 6.
  • FIG. 6 shows the guide and seating area as a detail from FIG. 5 again on a changed scale in order to better illustrate this valve area designed according to the invention.
  • the guide and seat area provided in the injection-side end 25 of the valve seat carrier 21 in its through opening 24 is in turn formed by the three axially successive, disc-shaped elements 35, 47 and 26. At the bottom 25 of the
  • Valve seat carrier 21 the inner through opening 24 is designed to taper conically in the flow direction.
  • the valve seat element 26 also has a conically tapering outer contour for precise fitting into the valve seat carrier 21.
  • the three elements 35, 47 and 26 are introduced through the through opening 24 from above, that is to say from the side facing the armature 19, starting with the valve seat element 26.
  • the weld seam 61 at the lower end 25 of the valve seat carrier 21 is loaded significantly less.
  • the Swirl element 47 has such an outer diameter that it can be fitted tightly into the through opening 24 of the valve seat carrier 21 with little play.
  • FIG. 7 shows a further guiding and seating area, in which the end 25 of the valve seat support 21 is surrounded circumferentially by an additional tubular fastening part 70.
  • the swirl element 47 and the valve seat element 26 are provided with a larger outer diameter than the diameter of the passage opening 24, which is why the swirl element 47 bears at the end 82 at the end 25 of the valve seat carrier 21.
  • the guide element 35 is designed as a flat disk and is arranged inside the through opening 24, the outer diameter being significantly smaller than the diameter of the through opening 24, so that fuel can flow axially along the outer circumference of the guide element 35.
  • valve seat element 26 and valve seat support 21 The fixed connection of valve seat element 26 and valve seat support 21 is achieved by the additional fastening part 70.
  • the thin-walled, tubular fastening part 70 surrounds both the valve seat element 26 and the swirl element 47 and also the end 25 of the valve seat carrier 21. With the weld seam 61, the valve seat element 26 and the fastening part 70 are connected to one another at their lower, flush end faces.
  • the fastening part 70 has on its lower end face an inwardly projecting, circumferential shoulder 74 on which the
  • Valve seat element 26 can sit on a step 75. Due to this design of the fastening part 70, the weld seam 61 can be applied with less material application and associated less welding distortion. The The weld seam 61 in such an embodiment is significantly less stressed than in the embodiment according to FIG. 2. The weld can therefore be carried out with less thermal energy, which guarantees the shape accuracy of the valve seat element 26 in any case.
  • the connection of the valve seat support 21 and the fastening part 70 is carried out by a second weld seam 71, which is, for example, somewhat stronger than the weld seam 61, which e.g. is mounted upstream of the guide member 35 from the outer periphery of the fixing part 70.
  • the additional fastening part 70 enables the swirl element 47 and the guide element 35 to be aligned very precisely with respect to the longitudinal axis of the valve seat carrier 21, with the result that jamming or jamming of the guide element 35 on the valve needle 20 is avoided.
  • the swirl element 47 has an outer diameter such that it can be fitted tightly into the fastening part 70.
  • the compression spring 50 is in turn installed in the through opening 24 of the valve seat carrier 21, one end of which rests on the spring-tensioned guide element 35 and the end facing away from the guide element 35 is supported on the shoulder 49 in the valve seat carrier 21.
  • a sealing element 73 is inserted, for example, between an outer shoulder 72 on the valve seat support 21 and the upper end of the fastening part 70 facing away from the weld seam 61.
  • valve closing section 28 can also be used otherwise, e.g. be spherical.
  • Ball section at the downstream end of the valve needle 20 the center of the ball advantageously lies axially Height of the guide element 35. This effectively prevents the valve needle 20 from jamming in the guide element 35.
  • the step 51 provided in the through opening 24 not only serves to enlarge the opening diameter for receiving the elements 35, 47 and 26, but also as a contact surface for the upper end face of the guide element 35.
  • at least one groove-like flow channel 69 is formed on the outer circumference of the guide element 35. These flow channels 69 have on the upper end face of the
  • Guide element 35 has such a large radial extent that fuel can enter it unhindered from upstream of step 51.
  • the fuel After flowing through the at least one flow channel 69, the fuel enters an annular space 76 which is located between the guide element 35 and the swirl element 47 and which results from the circumferential chamfer 56 formed on the lower end face of the guide element 35.
  • the fuel flows from the annular space 76 into the opening area 60, in particular into the ends 65 of the swirl channels 63 of the swirl element 47 serving as collecting pockets. In the manner already explained, disturbing turbulences occurring in the fluid are reduced in the collecting pockets 65.
  • the game between the valve needle 20 and the guide element 35 in the guide opening 55 is very small, so that there is no leakage current in this area due to the pressure difference between the two end faces of the guide element 35 of the fuel is coming.
  • the three elements 35, 47 and 26 are pre-fixed in the through opening 24.
  • the guide element 35 has a significantly greater play in the through opening 24 than the valve needle 20 in the guide opening 55.
  • the final alignment of the guide element 35 with respect to the valve seat element 26 can be carried out subsequently, the alignment using the valve needle 20 or a comparable contour has auxiliary body.
  • the exemplary embodiment according to FIG. 8 can also be designed in such a way that the elements 35, 47 and 26 are fixed in the through opening 24 by slight play or even pressure.
  • the valve seat element 26 can be fastened by the weld seam 61 or by flanging in the through opening 24.
  • FIG. 9 shows a further guide and seat area of a fuel injector according to the invention, in which no separate guide element 35 is provided. Rather, the valve seat support 21, which partially forms the valve housing, has a lower guide section 35 ′ facing the valve seat element 26.
  • the guide opening 55 for guiding the valve needle 20 is therefore in the
  • Valve seat support 21 integrated.
  • the passage opening 24 in the valve seat carrier 21 thus ends as a guide opening 55 in the downstream direction.
  • Upstream of the guide opening 24 branches out of the through opening 24 in a conically tapering direction in the downstream direction Opening section 79 from one or more flow openings 81, for example extending obliquely to the valve longitudinal axis 8, which end at the lower spray-side end face 82 of the valve seat carrier 21.
  • Valve seat element 26 with its valve seat surface 27 is tightly fastened by means of two annular weld seams 83 and 84 provided on the outer circumference.
  • both the valve seat carrier 21 and the swirl element 47 and the valve seat element 26 have the same outer diameter, for example.

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

Abstract

L'invention concerne un injecteur de carburant, notamment un injecteur haute pression pour l'injection directe de carburant dans une chambre de combustion d'un moteur à combustion interne à allumage par appareillage externe et à compression du mélange, qui est caractérisé en ce qu'au niveau de son extrémité aval se trouve une zone de guidage et de siège formée de trois éléments discoïdes (35, 47, 26), un élément de turbulence (47) étant inséré entre un élément de guidage (35) et un élément de siège d'injecteur (26). L'élément de guidage (35) sert au guidage d'une aiguille d'injecteur (20) axialement mobile traversant ledit élément, tandis qu'une section de fermeture (28) de l'aiguille d'injecteur (20) coopère avec une surface de siège (27) de l'élément de siège d'injecteur (26). L'élément de turbulence (47) présente une région d'ouverture intérieure dotée de plusieurs canaux de turbulence qui ne se trouvent pas en communication avec la périphérie extérieure dudit élément de turbulence (47). Toute la région d'ouverture traverse complètement, dans le sens axial, l'épaisseur de l'élément de turbulence (47).
EP98947359A 1997-08-22 1998-07-28 Injecteur de carburant Expired - Lifetime EP0934459B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19736682 1997-08-22
DE19736682A DE19736682A1 (de) 1997-08-22 1997-08-22 Brennstoffeinspritzventil
PCT/DE1998/002135 WO1999010649A1 (fr) 1997-08-22 1998-07-28 Injecteur de carburant

Publications (2)

Publication Number Publication Date
EP0934459A1 true EP0934459A1 (fr) 1999-08-11
EP0934459B1 EP0934459B1 (fr) 2002-10-23

Family

ID=7839919

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98947359A Expired - Lifetime EP0934459B1 (fr) 1997-08-22 1998-07-28 Injecteur de carburant

Country Status (8)

Country Link
US (1) US6145761A (fr)
EP (1) EP0934459B1 (fr)
JP (2) JP4097713B2 (fr)
KR (1) KR100623402B1 (fr)
CN (1) CN1095932C (fr)
CZ (1) CZ292735B6 (fr)
DE (2) DE19736682A1 (fr)
WO (1) WO1999010649A1 (fr)

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JP2008106781A (ja) 2008-05-08
KR20000068730A (ko) 2000-11-25
US6145761A (en) 2000-11-14
DE59806045D1 (de) 2002-11-28
DE19736682A1 (de) 1999-02-25
CZ135999A3 (cs) 1999-12-15
KR100623402B1 (ko) 2006-09-13
JP4097713B2 (ja) 2008-06-11
JP4510871B2 (ja) 2010-07-28
WO1999010649A1 (fr) 1999-03-04
CN1095932C (zh) 2002-12-11
CZ292735B6 (cs) 2003-12-17
EP0934459B1 (fr) 2002-10-23
JP2001504914A (ja) 2001-04-10
CN1237225A (zh) 1999-12-01

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