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EP0476298B1 - Soupape d'injection pour l'alimentation d'un moteur à combustion interne avec un mélange de carburant et de gas - Google Patents

Soupape d'injection pour l'alimentation d'un moteur à combustion interne avec un mélange de carburant et de gas Download PDF

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Publication number
EP0476298B1
EP0476298B1 EP91113532A EP91113532A EP0476298B1 EP 0476298 B1 EP0476298 B1 EP 0476298B1 EP 91113532 A EP91113532 A EP 91113532A EP 91113532 A EP91113532 A EP 91113532A EP 0476298 B1 EP0476298 B1 EP 0476298B1
Authority
EP
European Patent Office
Prior art keywords
platelet
passage
opening
fuel injection
injection valve
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
EP91113532A
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German (de)
English (en)
Other versions
EP0476298A1 (fr
Inventor
Martin Dr. Dipl.-Ing. Maier
Hans-Peter Dr. Dipl.-Min. Trah
Juergen Dipl.-Ing. Buchholz (Fh)
Udo Dipl.-Ing. Jauernig
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
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Filing date
Publication date
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Publication of EP0476298A1 publication Critical patent/EP0476298A1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/047—Injectors peculiar thereto injectors with air chambers, e.g. communicating with atmosphere for aerating the nozzles
    • 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
    • F02M51/08—Injectors peculiar thereto with means directly operating the valve needle specially for low-pressure fuel-injection
    • 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
    • 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
    • F02M67/00—Apparatus in which fuel-injection is effected by means of high-pressure gas, the gas carrying the fuel into working cylinders of the engine, e.g. air-injection type
    • F02M67/10—Injectors peculiar thereto, e.g. valve less type
    • F02M67/12—Injectors peculiar thereto, e.g. valve less type having valves

Definitions

  • the invention is based on a fuel injection valve with a perforated body according to claim 1.
  • a fuel injection valve with a perforated body according to claim 1.
  • an injection valve according to the preamble of claim 1 for the injection of a fuel-gas mixture is already known, which has a gas guide sleeve made of sheet metal at its downstream end having.
  • the injection opening of the injection valve is surrounded in the immediate vicinity by a gas ring gap on the gas guide sleeve which is connected to a gas ring channel.
  • it is necessary due to the manufacturing tolerances of the gas ring gap to measure the gas quantity at each individual injection valve and then to bend or shift the gas guide sleeve accordingly, ie to adjust it.
  • This adjustment process and thus the optimization of the gas ring gap requires a great deal of effort, so that the production of the known injection valve in high-volume production causes high costs.
  • An injection valve is also known from EP 0 354 659 A2, in which a perforated body consisting of two silicon wafers is used.
  • the spray openings of the upper plate and the passage opening of the lower plate are arranged offset from one another.
  • the platelets are only used for fuel preparation or metering, but not for metering a gas comprising the fuel.
  • the fuel injector according to the invention with the characterizing features of claim 1 has the advantage of enabling the metering of the fuel and the metering of the fuel processing and comprehensive gas by the exact formation of the channels in a confined space without having to adjust the metered amount of gas at the finished mounted injector is required.
  • This combination of fuel and gas metering in the smallest of spaces achieves very good fuel processing.
  • a corresponding position of the channels in the perforated body allows the gas to be aimed specifically at the fuel jet or jets.
  • the upper plate and the lower plate are formed from monocrystalline silicon and openings, grooves and recesses in the upper plate and the lower plate are formed by anisotropic etching.
  • the platelets are not only easy to manufacture, they are also exceptionally high in manufacturing accuracy.
  • At least one lower passage groove is formed in an upper end face of the lower plate facing the upper plate, which at least together with an opposite lower end face of the upper plate facing the lower plate forms a channel.
  • At least one upper passage groove is formed in the lower end face of the upper plate facing the lower plate, which forms the at least one channel together with the opposite end face of the lower plate facing the upper plate.
  • recesses extend from side surfaces of the upper plate and / or the lower plate, which extend in the direction of the at least one spray opening or the passage opening and which provide a connection between the periphery of the plate and create the channels of the perforated body.
  • the lower end face of the upper plate facing the lower plate has at least one upper passage groove and the upper end face of the lower plate facing the upper plate have at least one lower passage groove, so that the at least one channel is formed by the at least one upper passage groove and the at least one lower passage groove.
  • the center line of the channel lies in one plane with the center line of the at least one spray opening.
  • the at least one upper passage groove in the upper plate is designed in such a way that it does not extend to a spray opening and that the channel opens into the passage opening inclined to the valve longitudinal axis.
  • the spray end of the valve receives the perforated body and is surrounded by a feed bush, on the circumference of which at least one transverse opening serving to supply the gas is formed.
  • FIG. 1 shows a partially illustrated fuel injector that can be used, for example, for injection systems of mixed-compression spark-ignition internal combustion engines, according to a first exemplary embodiment.
  • a nozzle body 2 of the valve for example made of a ferromagnetic material, has a stepped flow channel 5 concentric with a longitudinal valve axis 1.
  • a valve needle 8 is arranged in the flow channel 5. With its downstream end, which is designed, for example, as a valve closing part 9 which tapers conically downstream, the valve needle 8 interacts with a valve seat surface 10 of the stepped flow channel 5, which tapers conically in the flow direction, for example.
  • a guide section 11 of the flow channel 5, which is formed upstream of the valve seat surface 10, serves to guide the valve needle 8 during its axial movement, the valve needle 8 with its one upper guide collar 13 and one lower guide collar 14 projecting through the guide section 11 of the flow channel 5 with a small radial distance.
  • valve needle 8 The axial movement of the valve needle 8 and thus the opening and closing of the valve takes place, for example, electromagnetically in a known manner.
  • the valve needle 8 is connected at its end facing away from the valve seat surface 10 to an armature 17, which cooperates with a magnet coil 18 and an inner pole 16 of the fuel injection valve.
  • the flow channel 5 continues, for example, in the direction facing away from the magnetic coil 18, adjoins the conical valve seat surface 10 in a cylindrical flow-through section 19 and ends in a flow opening 20 of the nozzle body 2.
  • a perforated body 22 is arranged directly after the flow opening 20, which consists of a valve seat 10 facing, for example square upper plate 24 and a square lower plate 25.
  • the upper plate 24 lies with its one lower end face 26 facing away from the flow opening 20 against an upper end face 27 of the lower plate 25 facing the upper plate 24 and is connected to the latter.
  • Both the upper plate 24 and the lower plate 25 are made of monocrystalline silicon, for example, but it is also the choice of another suitable material, for example another monocrystalline semiconductor such as germanium or a compound semiconductor such as gallium arsenide.
  • the axial thickness of the upper plate 24 and the lower plate 25 is in each case approximately 0.2 to 0.5 mm, preferably approximately 0.3 mm.
  • At least one channel 28 is formed between the upper plate 24 and the lower plate 25, via which a gas used to form a fuel-gas mixture can flow radially from the periphery of the plates 24, 25 to the fuel.
  • a recess 30 is formed in the end face 34 of a downstream spray end 29 of the nozzle body 2 that the recess 30 comprises the perforated body 22 and the flow opening 20 opens at the bottom 21 of the recess 30 on which the perforated body 22 abuts with the upper plate 24.
  • at least one feed groove 33 is formed, for example, in the radial direction between the circumference of the spraying end 29 of the nozzle body 2 and the recess 30. extending in the axial direction from the end face 34 of the spray end 29 facing the valve seat face 10 at least up to the at least one channel 28.
  • At least one feed bore is formed in the spray end 29 of the nozzle body 2 or at least one feed channel is formed between the outer edge of the perforated body 22 and the wall of the recess 30.
  • the nozzle body 2 is at its end facing the end face 34, for example, of a feed bushing 36 both radially and surrounded in the axial direction.
  • the feed bush 36 has, for example, four transverse openings 37 which extend in the radial direction from the circumference of the feed bush 36 inwards to an annular supply space 38 which is between the circumference of the spray end 29 and a stepped longitudinal opening 39 the feed bushing 36 is formed.
  • a bottom 40 of the feed bush 36 facing the spray end 29 of the nozzle body 2 has a contact shoulder 42 in the radial direction facing the valve longitudinal axis 1.
  • the contact shoulder 42 projects with a flat contact surface 43 running perpendicular to the valve longitudinal axis 1 in the axial direction towards the spray end 29 Floor 40 out.
  • the feed bushing 36 lies with its flat contact surface 43 close to the perforated body 22, reliably fixes the axial position of the perforated body 22 in the recess 30 of the nozzle body 2 and ensures that the gas flows exclusively via the at least one channel 28 to the sprayed fuel flows there.
  • a cylindrical mixing opening 44 which runs concentrically to the longitudinal axis 1 of the valve, to which a mixture spray opening 45, which widens in a funnel shape, adjoins in the downstream direction.
  • a first annular groove 47 is formed above the four transverse openings 37, for example, which receives a sealing ring 48.
  • the sealing ring 48 forms a seal between the circumference of the nozzle body 2 and the longitudinal opening 39 of the feed bush 36.
  • valve If the valve is mounted with its feed bushing 36 in a valve receptacle, for example an intake line of the internal combustion engine, then it is necessary to feed the bushing 36 above and below to seal their transverse openings 37 with respect to the wall of the valve receptacle.
  • a second annular groove 50 is formed on the circumference of the feed bushing 36 above the transverse openings 37 of the magnet coil 18 and a third annular groove 51 is formed below the transverse openings 37, in each of which a sealing ring can be arranged.
  • FIG. 2 shows the perforated body 22 according to the first exemplary embodiment shown in FIG. 1.
  • FIG. 3 shows a plan view of the lower plate 25 corresponding to a section along the line III-III in FIG. 2 and
  • FIG. 4 shows a view of the perforated body 22 in the direction of the arrow X in FIG. 2.
  • this has e.g. Square upper plates 24 symmetrical to the longitudinal axis 1 of the valve, for example four truncated pyramid-shaped spray openings 60, which expand in the direction of the lower end face 26 of the upper plate 24 and directly adjoin one another on the lower end face 26.
  • the flow opening 20 of the flow channel 5 has a cross section covering all the spray openings 60 and is connected to the spray openings 60 in the downstream direction.
  • the edge length of the spray openings 60 is approximately 0.1 to 0.25 mm at its narrowest point.
  • the lower plate 25 which is also square, for example, has four outer side surfaces 61 which delimit the lower plate 25 in a vertical direction running parallel to the valve longitudinal axis 1 and which are perpendicular to one another at their ends.
  • the perforated body 22 has a first axis of symmetry 62 and a second axis of symmetry 63 which Halve the outer side surfaces 61.
  • a recess 64 with a rectangular bottom 67 is formed in the upper end face 27 of the lower plate 25 in a manner symmetrical with respect to the axis of symmetry 62 or 63.
  • the recesses 64 extend in the direction from the bottom 67 to the upper end face 27 of the lower plate 25 in a trapezoidal manner and together with the lower end face 26 of the upper plate 24 each form an inflow space 65.
  • the lower plate 25 Concentric to the longitudinal axis 1 of the valve, the lower plate 25 has, for example, a square passage opening 66, which widens in the shape of a truncated pyramid in the direction of flow.
  • the recesses 64 or the inflow spaces 65 extend inwards in the direction of the passage opening 66, but without being directly connected to the passage opening 66.
  • each recess 64 and the passage opening 66 in the upper end face 27 of the lower plate 25 at least one, in the first embodiment, for example, two inwardly leading lower passage grooves 69 are formed, which together with the lower Face 26 of the upper plate 24 each form a channel 28.
  • the channels 28 establish a connection between the inflow spaces 65, which are open towards the periphery of the plates 24, 25, and the passage opening 66 of the perforated body 22 and run parallel to the respective axes of symmetry 62 and 63, respectively 28 are at the same distance from the respective axis of symmetry 62 or 63, so that an axially and point-symmetrical design of the perforated body 22 results.
  • the lower passage grooves 69 have a rectangular bottom 73 and extend trapezoidally up to the upper end face 27 of the lower plate 25.
  • the axial extent of the lower passage grooves 69 in the direction of the axes of symmetry 62, 63 is approximately 0.1 to 0.25 mm.
  • the channels 28 are preferably oriented so that the exiting gas strikes the fuel exiting from one of the spray openings 60.
  • the center lines of the channels 28 preferably lie in a plane which runs through at least one of the center lines of the spray openings 60.
  • the channels 28 are always so narrow transversely to their center lines that they only extend over partial regions of the circumference of the passage opening 66 or one of the spray openings 60.
  • the formation of the spray openings 60, the recesses 64, the passage opening 66 and the lower passage grooves 69 in the upper platelets 24 and lower platelets 25 consisting of monocrystalline silicon is carried out in a known manner, for example by anisotropic etching.
  • the layers of a thin silicon plate are polished, coated with a thin oxide layer and a photo layer is applied to the layers.
  • a photo mask is placed on the photo layer and then exposed.
  • a developer liquid By using a developer liquid, a pattern of areas covered with the photo layer and bare oxide is created on the plate.
  • the exposed oxide areas are etched away in a bath with hydrofluoric acid, and then the photo layer is removed. This gives an oxide pattern on the plate, which serves as a mask for the subsequent etching.
  • the depressions When using anisotropic etchants, the depressions only grow in depth without widening.
  • the side walls of the depressions are formed by the crystal planes of the silicon wafers, so that there is a trapezoidal cross section of the depressions.
  • the etching process comes to a standstill as soon as a layer doped with boron, for example, is reached in the etching direction.
  • Cross sections of the spray openings 60, the recesses 64, the passage openings 66 and the lower passage grooves 69 are also possible, for example rectangular cross sections.
  • the lower face 26 of the upper plate 24 and the upper face 27 of the lower plate 25 are bonded together.
  • the lower end face 26 of the upper plate 24 and the upper end face 27 of the lower plate 25 are first polished and the surfaces are chemically treated.
  • the prepared surfaces of the upper plate 24 and the lower plate 25 to be joined are then brought together at room temperature.
  • the bonding process is ended, for example, by thermal treatment of the upper plate 24 and the lower plate 25 in a nitrogen atmosphere.
  • the gas used to form the fuel-gas mixture passes through the transverse openings 37 into the supply space 38, which is formed between the circumference of the nozzle body 2 and the longitudinal opening 39 of the supply bushing 36. From there, the gas flows through, for example, four inflow spaces 65 and the two channels 28 connected to them to the passage opening 66 of the perforated body 22, which extends concentrically to the longitudinal axis 1 of the valve and into which the fuel is also discharged through the spray openings 60.
  • the channels 28 have a narrow cross section, which throttles the flowing gas and thus serves for metering the gas.
  • the narrow cross section leads to an acceleration of the gas, so that the gas strikes the sprayed fuel at high speed and embraces it. This results in the formation of a largely homogeneous fuel-gas mixture.
  • the Fuel-gas mixture is discharged through the mixture spray opening 45, for example, into the intake line of the internal combustion engine.
  • the gas is, for example, air branched off by a bypass in front of a throttle valve in the intake manifold of the internal combustion engine.
  • a bypass in front of a throttle valve in the intake manifold of the internal combustion engine it is also possible to use recirculated exhaust gas from the internal combustion engine to reduce the emission of pollutants or a gas (air, exhaust gas) conveyed by an additional fan.
  • FIG. 5 A lower plate 25 of a perforated body 22 according to a second exemplary embodiment according to the invention is shown in FIG. 5. Parts that are the same and have the same effect are identified by the same reference numerals as in FIGS. 1 to 4.
  • the second exemplary embodiment differs from the first exemplary embodiment only by the number of channels 28 or by the number of lower passage grooves 69 formed in the upper end face 27 of the lower plate 25.
  • the four recesses 64 of the upper end face 27 one is in each case inwardly leading lower passage groove 69 formed, for example runs parallel to the respective axis of symmetry 62 or 63 of the lower plate 25 and opens into the passage opening 66.
  • the lower passage grooves 69 are all formed, for example, on the right side of the respective axis of symmetry 62 or 63. This leads to the fact that the supply of the gas into the passage opening 66 is swirled. This results in an improved mixture formation of fuel and gas.
  • the upper square plate 24 and the lower square plate 25 are formed from monocrystalline silicon in the third embodiment and bonded together.
  • Spray openings 60, recesses 84, passage opening 66 and upper passage grooves 82 are formed, for example, by anisotropic etching.
  • Concentric to the longitudinal valve axis 1 is formed in the lower plate 25 which, starting from the upper end face 27 of the lower plate 25 and extending in the flow direction in the direction of the flow in the shape of a truncated pyramid, forms a through passage opening 66.
  • the passage opening 66 e.g. four square spray openings 60, which are formed in the upper plate 24 symmetrically to the valve longitudinal axis 1, in connection.
  • the spray openings 60 extend from an upper end face 80 of the upper plate 24 in the direction of its lower end face 26 in the shape of a truncated pyramid and adjoin one another directly on the lower end face 26 of the upper plate 24.
  • the upper plate 24 is bounded on the outside by four side surfaces 81, which are perpendicular to one another at their ends. Starting from each of the side surfaces 81, a recess 84, which has a rectangular base 73 and extends inward in the direction of the spray openings 60, is formed in the lower end face 26 of the upper plate 24, the recesses 64 being symmetrical with respect to the axes of symmetry 62 and 63 lie and be divided into two equal parts by one of them.
  • the recesses 84 taper in a trapezoidal manner in the direction of the upper end face 80 of the upper plate 24. Together with the upper end face 27 of the lower plate 25, the recesses 84 each form one Inflow space 65 out.
  • Each inflow space 65 is connected, for example, by two channels 28 to the downstream ends of the spray openings 60.
  • the channels 28 are formed by upper, in the lower end face 26 of the upper plate 24 and the upper end face 80 facing a rectangular bottom 85 having upper passage grooves 82 and the upper end face 27 of the lower plate 25 and are always so narrow across their center lines that they only extend over partial areas of the circumference of the passage opening 66 or one of the spray openings 60.
  • the upper passage grooves 82 have a trapezoidal cross section and taper in the direction of the upper end face 80 of the upper plate 24.
  • the axial extent of the upper passage grooves 82 is approximately 0.1 to 0.25 mm.
  • two channels 28 each, starting from an inflow space 65, run symmetrically at the same distance and parallel to the respective axes of symmetry 62 or 63.
  • Each channel 28 opens directly into a spray opening 60, and that The gas supplied meets the fuel delivered centrally.
  • FIG. 8 A perforated body 22 according to a fourth exemplary embodiment according to the invention is shown in FIG. 8.
  • the channels 28 running in the upper plate 24 do not open directly into the spray openings 60 of the upper plate 24, but rather diagonally downward to the valve longitudinal axis 1 inclined into the passage opening 66 of the lower plate 25, so that the gas passes through the inflow spaces 65 and the channels 28 directly into the passage opening 66 and, in contrast to the first three exemplary embodiments, does not meet the delivered fuel at an angle but in the fuel flow direction.
  • an inflow of Prevents fuel in the channels 28.
  • the fourth embodiment essentially corresponds to the third embodiment.
  • FIG. 9 A perforated body 22 according to a further, fifth exemplary embodiment according to the invention is shown in FIG. 9. The same and equivalent parts are identified by the same reference numerals as in FIGS. 1 to 8.
  • the square spray openings 60 are formed symmetrically to the valve longitudinal axis 1. Starting from the upper face 80 in the direction of the lower face 26 of the upper plate 24, the square spray openings 60 expand in the shape of a truncated pyramid and adjoin one another directly on the lower face 26.
  • a recess 64 having a rectangular bottom 67 is formed in the upper end face 27 of the lower plate 25 and extends in the direction of the passage opening 66 of the lower plate 25.
  • the recesses 64 lie symmetrically to the axes of symmetry 62 and 63, the axes of symmetry 62 and 63 representing the center lines of the recesses 64.
  • the recesses 64 taper in a trapezoidal manner in the upper plate 24 in the direction facing away.
  • two lower passage grooves 69 are formed in the upper end face 27 of the lower plate 25, for example, which extend as far as the passage opening 66 and open into the passage opening 66.
  • Your Training corresponds, for example, to the design of the lower passage grooves 69 in the first exemplary embodiment according to the invention.
  • a recess 84 having a rectangular bottom 73 is formed from each of the four side surfaces 81 of the upper plate 24.
  • the recesses 84 extend inwards in the direction of the spray openings 60, end in front of them and, as shown for example in the third exemplary embodiment, lie symmetrically with respect to the symmetry axes 62 and 63, the symmetry axes 62 and 63 representing the central axes of the recesses 64.
  • the trapezoidal recesses 84 taper in the direction of the upper end face 80 of the upper plate 24.
  • the recesses 64 and the recesses 84 which overlap on the upper end face 27 of the lower plate 25 or on the lower end side 26 of the upper plate 24 and together form the respective inflow spaces 65, have identical geometric dimensions and, for example, at least in the area of their overlap an identical position with respect to the axes of symmetry 62 and 63.
  • two upper passage grooves 82 each extend, which extend inwards in the direction of the spray openings 60.
  • the upper passage grooves 82 run parallel to the respective axis of symmetry 62 and 63 and have a trapezoidal tapering cross section and a rectangular bottom 85 facing the upper end face 80.
  • the individual upper passage grooves 82 and the lower passage grooves 69 overlap on the lower end face 26 of the upper plate 24 and on the upper end face 27 of the lower plate 25 such that an upper passage groove 82 and a lower passage groove 69 together each have a channel 28 form, which is not up to a spray opening 60th enough, but inclined downward to the longitudinal valve axis 1 opens into the passage opening 66 of the lower plate 25 and is directed at one of the fuel jets emerging from the spray openings 60.
  • the respective upper passage grooves 82 and the lower passage grooves 69 have identical geometric dimensions and an identical position with respect to the axis of symmetry 62 and 63, respectively.
  • FIGS. 10 and 11 show a perforated body 22 according to a sixth exemplary embodiment according to the invention, FIG. 11 showing a plan view in the direction of the lower plate 25 corresponding to a section along the line XI-XI in FIG. 10.
  • the same and equivalent parts are identified by the same reference numerals as in FIGS. 1 to 9.
  • the perforated body 22 consists of the upper square plate 24 and the lower square plate 25, both of which are formed from monocrystalline silicon and are bonded to one another.
  • the upper square plate 24 and the lower square plate 25 have identical external dimensions. In the upper plate 24, as indicated by dashed lines in FIG.
  • four square spray openings 60 are formed, for example, which run symmetrically to the longitudinal valve axis 1 and which, starting from the upper end face 80 and to the lower end face 26 of the upper plate 24, expand in the shape of a truncated pyramid and adjoin one another directly on the lower end face 26.
  • the lower plate 25 has a passage opening 66 which runs concentrically to the valve longitudinal axis 1 and which has, for example, a square cross section and widens trapezoidally in the direction facing away from the upper plate 24.
  • symmetry axes 62 and 63 running parallel to the side surfaces 61, 88 denotes a first and 89 a second diagonal of the lower plate 25.
  • Starting from everyone Outer side surface 61 of the lower plate 25 are parallel to the two axes of symmetry 62 and 63 lower passage grooves 69 and symmetrical to the two diagonals 88 and 89, starting from the corners 91, two mutually opposite lower passage grooves 69 'in the upper end face 27 of the lower plate 25 formed, which extend inwardly to the passage opening 66.
  • the axes of symmetry 62 and 63 and the diagonals 88 and 89 form the central axes of the lower passage grooves 69 and 69 '.
  • the lower passage grooves 69 running parallel to the axes of symmetry 62 and 63 have a rectangular bottom 90
  • the lower passage grooves 69 'running symmetrically to the diagonals 88 and 89 have a bottom 90' tapering in the direction of the passage opening 66.
  • the lower passage grooves 69 and 69 'taper in a trapezoidal manner.
  • the lower passage grooves 69 and 69 ′ form the channels 28 opening into the passage opening 66.
  • This exemplary embodiment enables a particularly uniform containment and processing of the fuel discharged from the spray openings 60 by means of the gas supplied through the channels 28.
  • FIGS. 12 to 14 show a perforated body 22 according to a seventh exemplary embodiment according to the invention, the same and equivalent parts being identified with the same reference numerals as in FIGS. 1 to 11.
  • FIG. 13 shows a section along the line XIII-XIII in FIG 12
  • FIG. 14 is a view of the upper plate 24 corresponding to a section along the line XIV-XIV in FIG. 13.
  • the upper square plate 24 and the lower square plate 25 are formed from monocrystalline silicon and are connected to one another, for example, by bonding.
  • the rectangular through-opening 66 Concentric to the longitudinal axis 1 of the valve is formed in the lower plate 25, the rectangular through-opening 66 which widens in the shape of a truncated pyramid in the flow direction, starting from an upper end face 27 of the lower plate.
  • the passage opening 66 e.g. four square spray openings 60, which are formed in the upper plate 24 symmetrically to the valve longitudinal axis 1, in connection.
  • the spray openings 60 expand starting from an upper end face 80 of the upper plate 24 in the direction of its lower end face 26 in the shape of a truncated pyramid and, for example, adjoin one another directly on the lower end face 26 of the upper plate 24.
  • one, one e.g. recess 84, 84 ' which has a rectangular bottom 73 and extends inward in the direction of the spray openings 60, is formed in the lower end face 26 of the upper plate 24.
  • the recesses 84 are e.g. symmetrical to the axis of symmetry 63 and the recesses 84 'e.g. symmetrical to the axis of symmetry 62, are divided into two parts of equal size by their axis of symmetry 63 and 62 and taper in the direction of the upper end face 80 of the upper plate 24. Together with the upper end face 27 of the lower plate 25, the recesses 84 and 84 'each have an inflow space 65 or 65'.
  • Two mutually opposite inflow spaces 65 which are divided into two parts of equal size, for example by the axis of symmetry 63, are each connected by two channels 28 to the downstream ends of the spray openings 60.
  • the channels 28 are formed by upper, in the lower end face 26 of the upper plate 24 upper passage grooves 82 and the upper end face 27 of the lower plate 25 and are, for example, so narrow transversely to their center lines that they only extend over partial areas of the spray openings 60 .
  • the upper passage grooves 82 taper in the direction of the upper end face 80 of the upper plate 24.
  • the two other, opposite inflow spaces 65 'arranged at an angle to it are connected to the passage opening 66 of the lower plate 25 through two channels 28 'which do not reach an injection opening 60 but are inclined obliquely downwards to the longitudinal axis 1 of the valve.
  • the channels 28 ' are formed by upper passage grooves 82' running in the upper plate 24. The gas thus passes through the inflow spaces 65 ′ and the channels 28 ′ directly into the passage opening 66 and strikes the dispensed fuel obliquely in the fuel flow direction.
  • the exemplary embodiments according to the invention enable the gas to be metered in a confined space without the channels 28, 28 ', which are always so narrow transversely to their center lines that they only extend over partial regions of the circumference of the passage opening 66 or one of the spray openings 60, must be set on the fully assembled valve to achieve the desired metered gas volume. Therefore, a very precise manufacture of the upper plate 24 and the lower plate 25 is required. For this purpose, it is particularly advantageous to form the upper plate 24 and the lower plate 25 from monocrystalline silicon and the spray opening 60, the recesses 64 and 84, 84 ', the through opening 66, the lower through grooves 69, 69' and the upper through grooves 82 , 82 ', for example, by anisotropic etching.
  • the perforated body 22 can not only be used in fuel injection valves for fuel injection systems but can also be used to atomize other media, namely whenever the finest liquid droplets are required, for example for uniform spraying of paints and varnishes and in manufacturing processes or the like.

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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)

Claims (16)

  1. Injecteur de carburant pour alimenter un moteur à combustion avec un mélange de gaz et de carburant, avec une pièce de fermeture de l'injecteur, qui coopère avec une surface de siège de l'injecteur et avec un corps à trous disposé en aval de la surface du siège de l'injecteur, l'injecteur de carburant caractérisée en ce que le corps à trous (22) se compose d'une pastille supérieure (24) tournée vers la surface du siège de l'injecteur (10) et présentant au moins un orifice d'injection (60) et d'une pastille inférieure (25) reposant sur la pastille supérieure (24) et présentant un orifice de passage (66) et en ce que la pastille supérieure (24) et la pastille inférieure (25) délimitent au moins un canal (28, 28') par l'intermédiaire duquel le gaz est amené et sur lequel est dirigé le carburant délivré à travers au moins l'un des orifices d'injection (60).
  2. Injecteur de carburant selon la revendication 1, caractérisée en ce que la pastille supérieure (24) et la pastille inférieure (25) sont réalisées en silicium monocristallin.
  3. Injecteur de carburant selon la revendication 2, caractérisée en ce que les orifices d'injection (60), l'orifice de passage (66), les rainures de passage (69, 69', 82,82') et les évidements (64, 85, 84') de la pastille supérieure (24) et de la pastille inférieure (25) sont formées par des gravures anisotropes.
  4. Injecteur de carburant selon la revendication 2 ou 3, caractérisée en ce que la pastille supérieure (24) et la pastille inférieure (25) sont reliées l'une à l'autre par bonding.
  5. Injecteur de carburant selon les revendications 1 à 4, caractérisée en ce que l'on forme dans une face frontale supérieure (27) de la pastille inférieure (25), tournée vers la pastille supérieure (24), au moins une rainure de passage inférieure (69, 69') qui forme en même temps qu'une face frontale (26) de la pastille supérieure (24), tournée vers la pastille inférieure (25), au moins le canal (28).
  6. Injecteur de carburant selon l'une des revendications 1 à 4, caractérisée en ce que dans la face frontale inférieure (25) tournée vers la pastille inférieure (25) de la pastille supérieure (24) on forme au moins une rainure de passage supérieure (82, 82') qui forme en même temps que la face frontale (27) opposée tournée vers la pastille supérieure (24) de la pastille inférieure (25) au moins le canal (28, 28').
  7. Injecteur de carburant selon l'une des revendications 1 à 4, caractérisée en ce que la face frontale inférieure (26) de la pastille supérieure (24) présente au moins une rainure de passage supérieure (82, 82') de même que la face frontale supérieure (27) de la pastille inférieure (25) présente au moins une rainure de passage inférieure (69) de telle sorte qu'au moins l'un des canaux (28, 28') soit formé par le recouvrement de la rainure de passage supérieure (82, 82') et de la rainure inférieure de passage (69).
  8. Injecteur de carburant selon l'une des revendications 1 à 7, caractérisée en ce que des évidements (64, 84, 84') partent des faces latérales (61, 81) de la pastille inférieure (25) ou de la pastille supérieure (24), évidements qui établissent une liaison entre le pourtour de la pastille (24, 25) et les canaux (28, 28')
  9. Injecteur de carburant selon l'une des revendications 1 à 8, caractérisée en ce qu'au moins l'orifice d'injection (60) dans la pastille supérieure (24) et l'orifice de passage (66) dans la pastille inférieure (25) se recouvrent l'un l'autre.
  10. Injecteur de carburant selon l'une des revendications 1 à 9, caractérisée en ce que la ligne médiane du canal (28) 28') se trouve dans un plan avec la ligne médiane d'au moins un orifice d'injection (60).
  11. Injecteur de carburant selon la revendication 10, caractérisée en ce que deux canaux (28) s'étendant perpendiculairement l'un à l'autre sont dirigés sur un orifice d'injection (60).
  12. Injecteur de carburant selon la revendication 10, caractérisée en ce que dans la pastille supérieure (24) sont constitués quatre orifices d'injection (60) adjacents les uns aux autres symétriquement par rapport à l'axe longitudinal (1) de l'injecteur et un canal (28) est dirigé sur chaque orifice d'injection (60).
  13. Injecteur de carburant selon la revendication 3 ou 4 à 12, caractérisée en ce que dans la pastille supérieure (24) on constitue une rainure supérieure de passage (82, 82') de telle façon qu'elle n'aille pas jusqu'à un orifice d'injection (60) et que le canal (28, 28') débouche dans l'orifice de passage (66) de façon inclinée par rapport à l'axe longitudinal (1) de l'injecteur.
  14. Injecteur de carburant selon la revendication 6, caractérisée en ce que l'on constitue des rainures de passage (82), se faisant vis-à-vis dans la pastille supérieure (24) de telle façon qu'elles forment respectivement un canal (28) dirigé sur respectivement un orifice d'injection (60) de la pastille supérieure (24) et que soient constituées en formant un certain angle par rapport à cela d'autres rainures de passage (82') supérieures, se faisant vis-à-vis, de la pastille supérieure (24) de telle façon qu'elles n'aillent pas jusqu'à un orifice d'injection (60) et qu'elles forment respectivement un canal (28') débouchant dans l'orifice de passage (66) de façon inclinée par rapport à l'axe longitudinal (1) de l'injecteur.
  15. Injecteur de carburant selon les revendications 1 à 5 ou 7 à 14, caractérisée en ce que la pastille inférieure (25) a une forme carrée et un canal (28, 28') mène de chaque face latérale (61) et de chaque angle (91) à l'orifice de passage (66).
  16. Injecteur de carburant selon l'une des revendications 1 à 5, caractérisée en ce que l'extrémité d'injection (29) de l'injecteur reçoit le corps à trous (22) et est entourée par une douille d'alimentation (36), sur le pourtour de laquelle est constitué au moins un orifice transversal (37) servant à l'alimentation du gaz.
EP91113532A 1990-09-21 1991-08-13 Soupape d'injection pour l'alimentation d'un moteur à combustion interne avec un mélange de carburant et de gas Expired - Lifetime EP0476298B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4029911 1990-09-21
DE4029911 1990-09-21
DE4112150 1991-04-13
DE4112150A DE4112150C2 (de) 1990-09-21 1991-04-13 Lochkörper und Ventil mit Lochkörper

Publications (2)

Publication Number Publication Date
EP0476298A1 EP0476298A1 (fr) 1992-03-25
EP0476298B1 true EP0476298B1 (fr) 1994-11-02

Family

ID=25897059

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91113532A Expired - Lifetime EP0476298B1 (fr) 1990-09-21 1991-08-13 Soupape d'injection pour l'alimentation d'un moteur à combustion interne avec un mélange de carburant et de gas

Country Status (6)

Country Link
US (1) US5402937A (fr)
EP (1) EP0476298B1 (fr)
JP (1) JPH04272475A (fr)
KR (1) KR100190478B1 (fr)
DE (2) DE4112150C2 (fr)
ES (1) ES2064831T3 (fr)

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CA2115819C (fr) * 1993-02-17 2000-07-25 Yasuhide Tani Injecteur de fluide
DE4312756A1 (de) * 1993-04-20 1994-10-27 Bosch Gmbh Robert Vorrichtung zur Einspritzung eines Brennstoff-Gas-Gemisches
US5383597A (en) * 1993-08-06 1995-01-24 Ford Motor Company Apparatus and method for controlling the cone angle of an atomized spray from a low pressure fuel injector
WO1995004881A1 (fr) * 1993-08-06 1995-02-16 Ford Motor Company Injecteur de carburant
DE4331851A1 (de) * 1993-09-20 1995-03-23 Bosch Gmbh Robert Lochkörper und Ventil mit Lochkörper
DE4333519A1 (de) * 1993-10-01 1995-04-06 Bosch Gmbh Robert Lochkörper
DE4409848A1 (de) * 1994-03-22 1995-10-19 Siemens Ag Vorrichtung zur Zumessung und Zerstäubung von Fluiden
US5437413A (en) * 1994-03-24 1995-08-01 Siemens Automotive L.P. Multiple disk air assist atomizer for fuel injection
DE19505887A1 (de) * 1995-02-21 1996-08-22 Bosch Gmbh Robert Verfahren zur Herstellung eines Metallkörpers mit feinen Kanälen
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EP0910775A4 (fr) * 1996-07-08 2002-05-02 Corning Inc Dispositif d'atomisation a l'aide de gaz
US6352209B1 (en) 1996-07-08 2002-03-05 Corning Incorporated Gas assisted atomizing devices and methods of making gas-assisted atomizing devices
US5730367A (en) * 1996-07-26 1998-03-24 Siemens Automotive Corporation Fuel injector with air bubble/fuel dispersion prior to injection and methods of operation
DE19703200A1 (de) * 1997-01-30 1998-08-06 Bosch Gmbh Robert Brennstoffeinspritzventil
US6371387B1 (en) * 1997-03-13 2002-04-16 Siemens Automotive Corporation Air assist metering apparatus and method
EP0939858B1 (fr) 1997-09-16 2004-04-28 Robert Bosch Gmbh Disque perfore ou disque de pulverisation et soupape injectrice dotee d'un tel disque perfore ou disque de pulverisation
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Also Published As

Publication number Publication date
DE59103408D1 (de) 1994-12-08
KR920006635A (ko) 1992-04-27
KR100190478B1 (ko) 1999-06-01
DE4112150C2 (de) 1998-11-19
ES2064831T3 (es) 1995-02-01
DE4112150A1 (de) 1992-03-26
EP0476298A1 (fr) 1992-03-25
JPH04272475A (ja) 1992-09-29
US5402937A (en) 1995-04-04

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