WO2010121767A1 - Buse présentant au moins un trou d'injection pour la pulvérisation de fluides - Google Patents

Buse présentant au moins un trou d'injection pour la pulvérisation de fluides Download PDF

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Publication number
WO2010121767A1
WO2010121767A1 PCT/EP2010/002378 EP2010002378W WO2010121767A1 WO 2010121767 A1 WO2010121767 A1 WO 2010121767A1 EP 2010002378 W EP2010002378 W EP 2010002378W WO 2010121767 A1 WO2010121767 A1 WO 2010121767A1
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WO
WIPO (PCT)
Prior art keywords
diameter
laser
hole
fluid
nozzle according
Prior art date
Application number
PCT/EP2010/002378
Other languages
German (de)
English (en)
Inventor
Herbert Walter
Gisbert Staupendahl
Original Assignee
Prelatec 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
Priority claimed from DE102009017788A external-priority patent/DE102009017788A1/de
Application filed by Prelatec Gmbh filed Critical Prelatec Gmbh
Publication of WO2010121767A1 publication Critical patent/WO2010121767A1/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
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1846—Dimensional characteristics of discharge orifices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting
    • B23K26/382—Removing material by boring or cutting by boring
    • B23K26/389—Removing material by boring or cutting by boring of fluid openings, e.g. nozzles, jets

Definitions

  • Nozzle with at least one spray hole for atomising fluids
  • Such nozzles serve, for example, the injection of fuels in diesel and gasoline engines.
  • the developer therefore has to solve the problem of increasing the hydraulic efficiency of the nozzles by targeted shaping of the injection hole without further increasing the injection pressure in such a way that the effects of coking and cavitation are avoided and the jet breakup is intensified for better introduction of air into the spray, on the one hand to optimize the combustion process and on the other hand to ensure a long service life of the nozzles.
  • the inventor has the task of creating a fluidically favorable injection hole in which the per unit time to be atomized fluid is transported with the lowest possible flow resistance and consequently relatively low pressure loss up to the outlet opening of the hole that prevail flow velocities and flow conditions at this point , which ensure optimal atomization and thus in the case of a fuel injector optimal distribution of the fluid in the combustion chamber with negligible cavitation and coking phenomena.
  • the present invention is based on a proposed with the above-mentioned international patent application and in The preamble of claim 1 specified nozzle, which is optimized for achieving the above object with the measures indicated in the characterizing part of claim 1.
  • the spray hole is divided into three zones, namely an inflow zone, a transition or compression zone and an outflow zone.
  • the volumes of these three zones are dimensioned according to the conditions given in claim 1.
  • the basic ratios of the volumes of these three zones are determined by the following requirements:
  • the volume V E of the inflow zone is to be determined in size so that
  • the volume Vo of the transition or compression zone is to be designed so that
  • the volume V A of the discharge zone should be such that
  • volume V A of the discharge zone differs. considerably smaller than the volume Vo of the transition and compression zone and much smaller than the volume V E of the inflow zone must be.
  • the fluid 101 which flows strongly out of the supply space 107 in its direction, initially reaches the inflow zone 104 with the volume V E and is there with a low flow resistance over at least 50% of the total length L 1 of the Spray hole passed to the transition or compression zone 105 with the volume V 0 . With the higher speed reached there, the fluid subsequently enters the outflow zone 106 with the volume V A , in order then to leave the injection hole with the desired jet properties as outflowing fluid 102.
  • V E V 0 > V A
  • the injection hole is produced in particular by means of a method as described below for drilling holes of defined geometries, in particular defined hole cross sections, by means of laser radiation.
  • the main concern of the method is the production of such hole cross-sections, that an optimal atomization of fluids can be ensured, the most important application is the drilling of injectors for internal combustion engines.
  • the combustion process in diesel and gasoline engines depends on the motor side given conditions of the combustion chamber shape, air movement and nozzle position of a variety of injection system parameters. These include the nozzle design and the associated nozzle hole position, number of holes, hole length for atomizing the fuel into the combustion chamber as well as the height and time course of the injection pressure.
  • Critical criteria are the reduction of the fuel droplet size and the flow losses during the injection process. Smaller nozzle bores associated with higher pressure generally result in a small fuel droplet size.
  • the bore diameter and the streamlined design of the holes are the relevant parameters.
  • the current state of the art is characterized in that the shape of such holes, whether produced by mechanical drilling, erosion, ultrasonic or laser processes, is cylindrical or conical with more or less straight walls. In this way, it is not possible to provide fluidically optimal conditions for the atomization of fluids.
  • the hole shape, especially the widening of the borehole in the beam direction is devoted to the patent GB 2 227 965 A.
  • a control of the beam with respect to angle of incidence and distance between the beam and bore axis is proposed with the aim to realize as variable conical holes different wall inclination.
  • the more theoretical considerations on the intensity profile of the Bohrstrahlung in the patent DE 10 2004 014 820 B serve the same purpose.
  • the arrangement which is described in Patent DE 199 05 571 C 1 also serves to produce defined conical hole shapes with widening in the beam direction.
  • Their basic idea is the synchronous rotation of the polarization direction of the laser beam with a tumbling motion of the beam, which is generated by a corresponding device.
  • the effectiveness of the entire drilling process on the one hand and the increase of the precision of the realized hole on the other hand serve multistage processes, which consist of a first step, the pre-drilling, and a second step, the production of the final wellbore shape.
  • a coupling between laser and erosion can be used, as described for example the patents EP 0 299 143 A1 and DE 10 2004 054 587 B3, or two lasers with different beam properties as in DE-OS 101 44 088 A first shown used.
  • the basic idea is not to be limited by the previously common laser technologies on hole shapes such as the aforementioned cylindrical or conical cross-sections, but to go out of aerodynamic optimal hole shapes and provide for their production suitable technologies and methods.
  • the demands that a fluidically favorable hole has to fulfill are clear:
  • the amount of fluid to be atomized per unit time should be transported to the outlet opening of the hole with the lowest possible flow resistance and thus a relatively low pressure drop, so that flow velocities and flow conditions (laminar -turbulent), which ensure optimum atomization and thus in the specific case of a fuel injection nozzle optimal distribution of the fluid in the combustion chamber.
  • This wellbore shape is characterized by three sections which, viewed in the direction of the flowing fluid, comprise a first section, the cylindrical part for the fluid inlet of diameter d E , a subsequent second section in which this diameter tapers and finally a third section, which is again preferably cylindrical and has the diameter d A of the Fluidaustrittsöff- tion exists.
  • the first section (the fluid inlet area) should have a length L E which, for example, is three times as large as the length L A of the third portion of the bore, the fluid outlet region.
  • the shape of the second section, the "transition area” is intended to ensure a fluidically favorable transition from section 1 to section 3. This is best done by a continuous, rounded and edge-free bore progression from d E to d A.
  • the hole shape described at the same flow conditions at the nozzle outlet especially at the same outflow velocity of the fluid or the same amount of fluid flowing per unit time, fluidly has much more favorable properties, for example, in a much lower required injection pressure compared to the conventional cylindrical or conical nozzle holes reflects.
  • the described basic shape of the borehole can be varied within wide limits using all available optical and mechanical possibilities and thus be adapted to specific requirements.
  • the diameter and length ratios can be selected in the limits that are defined in more detail in claim 1.
  • the production of the illustrated wellbore shape requires suitable process steps, which will be explained in more detail below.
  • the essence of the method for producing such holes especially in the targeted exploitation of the propagation properties of laser radiation in the focus area, so the Kaustik, on the one hand, and integral absorption and reflection conditions in the borehole on the other hand.
  • the former are by the wavelength of the radiation, the intensity profile of the radiation at the location of the focusing element, the i. a. is summarily detected by the beam quality number K, and the imaging properties of the focusing element, which consists in the simplest case of a lens affected with minimal aberrations, determines.
  • the three wellbore sections defined above also, to a certain extent, define sections of the drilling process that are characterized by different machining parameters.
  • the respective specifics are according to the invention, as already mentioned above, reduced to the possibly time-varying sizes of beam propagation (Kaustikform) and intensity in terms of Fresnel absorption in the borehole and taking into account the wavelength of the radiation.
  • the hole shape described can be achieved in various ways, the drilling process can be divided into two sections, in principle, the pre-drilling and the Shape-giving.
  • This first part of the drilling process is characterized by two machining objectives - on the one hand, it should already largely realize the fluid outlet region of the bore in its desired shape and, on the other hand, create favorable conditions for the second bore section.
  • the latter may mean that z. B. by a blind hole of defined depth, the length of the fluid outlet region and thus the starting point of the transition region is set, or that a through hole is created, which already corresponds approximately to the specifications in the area of the fluid outlet region in their dimensions, in the sections 2 and 3 of the hole, however, still requires a shaping.
  • For the pre-drilling section both laser radiation and alternative methods such as machining, eroding or ultrasonic machining can be used.
  • Vorbohrabites When using laser radiation is typical that the Vorbohrabites is generally carried out with radiation of a fixed wavelength, a fixed intensity profile, ie a fixed K-number and thus ultimately a solid Kaustikform in the focus area.
  • the transition area and the area of the fluid inlet are to be created in accordance with the flow technology specifications.
  • This section forms a focus of the inventivemaschineslosungen.
  • the objective of "down-widening" the wellbore under defined design constraints can be realized in a variety of ways, but in any case requires a suitable caustic shape, which can a) conform to the caustics of the pre-drilling process and thus be kept constant throughout the drilling process, b) c) be changed from the caustic of the Vorbohrvones to an optimized design for the drilling and caustic form during the shaping drilling kept constant until the completion of the ge ⁇ entire drilling process or, finally, characterized by forming during the drilling time variable caustic form.
  • Kaustikform to the desired sequence of the drilling process and thus to the desired hole shape, assuming a fixed-time focusing element can be realized by subsequently discussed variants of the beam shaping.
  • the intensity profile or the K-number of laser radiation is changed either internally, ie in the laser resonator itself, by suitable measures such as temporal variation of the pumping process or change the optical resonator configuration, or externally, ie outside the laser cavity, z. B. by introducing suitable optical elements such as diffractive optics in the beam path. Since ia an extreme Reliable operation of the laser itself is sought and interfering with the laser function, especially in industrial continuous operation the risk of instabilities in itself, the external methods of beam profile change of particular practical interest. So z. B.
  • the beam diameter at the location of the focusing element is changed.
  • the possibilities 2. and 3. can be z. B. realize using variable telescopes or adaptive optics in the beam path.
  • the basic method for producing the described hole shapes according to the invention is based on the use of a single laser of a wavelength adapted to the hole diameter, it being a rule of thumb that for typical cases the wavelength should be about one order of magnitude smaller than the hole diameter.
  • a single laser of a wavelength adapted to the hole diameter it being a rule of thumb that for typical cases the wavelength should be about one order of magnitude smaller than the hole diameter.
  • the wavelength dependence of the diffraction causes the caustic of such a focused laser beam to have a substantially different shape than, for example, the most commonly used lasers for drilling such holes with wavelengths of about 1 ⁇ m.
  • the tenfold stronger diffraction of the CO 2 laser radiation in combination with a suitable focusing and the interaction of the beam quality K of the laser and the specific occurring on the borehole walls Fresnelabsorptionsen are the key to the formation of the desired hole shape.
  • the entire drilling process takes place from one direction, with the narrowest point of the borehole at the jet inlet and the expanded section lying in the beam direction in the lower part of the pierced material especially in the described hole shape.
  • the geometric requirements for holes in an injection nozzle are met.
  • active shaping of the borehole in the course of the drilling process as generally described above, the shape of the focus caustic and its position can be varied. Possible influences of the described beam shaping variants on the drilling process will be described again by way of example below.
  • the beam quality number K of the laser radiation is changed.
  • the drilling process can be started with a relatively low beam quality and consequently with a relatively large focus diameter (pre-drilling section).
  • a significant reduction in the focus diameter is achieved by increasing the K number and thus protecting the sharp fluid outlet edge produced in the first drilling section from damaging melting in the further course of the bore. This option is even more important because in the shaping drilling section, that is to say when producing the widened bore hole parts, it is necessary to work with comparatively high radiation intensities.
  • Analogous results can be achieved by varying the laser beam diameter on the focusing lens during the drilling process. Such a change in diameter can be realized for example by means of suitable faster adaptive optics. Since the focus diameter is inversely proportional to the bundle diameter on the lens, both the focus diameter and the shape of the caustic are changed in this way. In this method, one could start, for example, the drilling process with a comparatively small beam and thus a relatively large focus diameter. Analog point a) is then replaced by a Increasing the beam diameter improves the sharpness of the focusing and thus also protects the fluid outlet edge produced in the pre-drilling section from harmful melting.
  • the beam quality number can be varied within wide limits, which is useful, for example, in combination with the diffraction of the radiation at the very small fluid outlet opening, which was realized in Vorbohrabsacrificing to widen the lower portions of the well.
  • the position of the focus caustic can also be actively used for the formation of boreholes according to the invention.
  • the narrowest part of the borehole be placed in the workpiece interior.
  • Another special hole shape according to the invention is characterized in that in an additional process step, the rotationally symmetrical borehole is provided with a preferably slot-shaped structure at the fluid outlet to control the atomization behavior of the fluid so that, for example, in internal combustion engines optimal distribution.
  • the dimensions of this slot-shaped structure can vary within wide limits, but should typically be within the intervals stated in claim 10.
  • This additional structure can be produced either with the long-wavelength laser itself, ie preferably a CO 2 laser, a shorter-wavelength laser or one of the alternative methods mentioned.
  • the manufacturing process of this structure can be modified in such a way that on the bolt circle of the holes a continuous depression of the desired dimensions before the actual drilling either by defined material removal is introduced by means of laser radiation or by alternative methods, wherein the cross section of this recess in principle arbitrary, but preferably symmetrical to the bolt circle located forms such as triangle, rectangle, semicircle can have oa.
  • the laser drilling process can be divided into two sections with respect to the working gas, wherein in the first section the desired hole shape using a first working gas, which supports the formation of the hole shape and accelerates the drilling process, generated and in the second section by means of a second working gas an improvement in the surface quality of the bore walls is realized.
  • Typical working gases would be eg oxygen for the first and argon for the second section.
  • FIG. 1 shows a cross section of the injection hole according to a first exemplary embodiment of the invention
  • Figure 2 cross section of the injection hole according to a second embodiment of the invention
  • FIG. 3 shows a plan view and a cross section of an injection hole according to the invention with a defined transverse slot at the outlet of the fluid
  • Figure 4 head of an injection nozzle with injection holes according to the invention and continuous transverse slot on the bolt circle at the fluid outlet
  • FIG. 5 Variants of the change of the focus geometry during the drilling process a) Variation of the K-number of laser radiation during the drilling process b) Variation of the bundle diameter of the laser radiation at the location of the focusing element during the drilling process c) Variation of the beam divergence of the laser beam at the location of the focusing element during the drilling process
  • FIG. 6 For varying divergence (a) or diameter (b) of the laser beam at the location of the focusing element by means of adaptive optics
  • FIG. 7 Two-stage drilling of an injection hole according to the invention a) First stage: blind bore b) First + second stage: complete drilling
  • FIG. 8 Two-stage drilling of an injection hole according to the invention a) First stage: small bore (pre-drilling) b) First + second stage: complete drilling
  • FIG. 9 Two-stage drilling of an injection hole according to the invention a) First stage: Drilling of the fluid exit region with focus position by an amount ⁇ z above the workpiece surface b) First + second stage: complete bore; at second stage focus position on workpiece surface Fig. 1 shows the cross section of the nozzle hole according to the invention in a first embodiment, which simultaneously represents the basic shape of the hole.
  • This hole is characterized by three sections, which result from fluidic considerations. Viewed from the direction of flow 8 of the fluid, this hole initially has a relatively wide first portion (30) of diameter d E , which extends over a length L E from the fluid inlet opening 7 to the transition region 5, in which a narrowing of this diameter d A takes place, extends.
  • This quasi-cylindrical fluid inlet region 6 has the task of providing the fluid with the lowest possible flow resistance and thus low pressure loss up to the second section (31) of the borehole, the transitional region 5 and finally to the third and for the type of fluid outlet, For example, its atomization, crucial third section (32) to transport the quasi-cylindrical fluid outlet region 4.
  • the fluid is a virtually incompressible liquid
  • p E -p A p E is the static fluid pressure at the fluid inlet opening 7, p A the static pressure at the fluid outlet opening 3 in the region 5 at a predetermined pressure difference because of the equation of continuity of fluid mechanics an increase in the flow velocity of v E at the fluid inlet opening 7 on v A at the fluid outlet opening 3.
  • Whose length L is given essentially by the thickness L w of the material 1, resulting from strength considerations in the nozzle design.
  • the hole can be made from a machining direction 2, as in many important applications of such nozzle holes, for example, in injection nozzles of internal combustion engines, a two-stage drilling of front and rear side by the geometry of the overall nozzle is virtually impossible.
  • An essential role in the drilling process plays the working gas 17.
  • oxygen and argon are used for drilling holes in injection nozzles.
  • Fig. 2 shows two further typical embodiments of the borehole according to the invention in which the "waist" of the borehole 9 lies within the workpiece.
  • FIG. 3 A further embodiment of the borehole according to the invention is shown in FIG. 3 in cross section and top view.
  • This hole shape is characterized by an auxiliary slot 10 of width b ⁇ and the depth ts, where t s should not be greater than the length of the fluid outlet area L A. Its function consists in a defined modification of the atomization characteristics of the round original borehole 3.
  • the auxiliary slot can also be used as a continuous auxiliary slot 12 of width b s by a very wide variety of methods, eg be made by laser or cutting process, before the actual drilling process.
  • the cross section of the continuous auxiliary slot 12 may in principle have arbitrary, but preferably symmetrical to the bolt circle shapes such as triangle, rectangle, semicircle or the like.
  • Fig. 5 illustrates three variants of how the focus caustics can be changed during the drilling process.
  • the goal here is again the realization of defined borehole shapes.
  • Fig. 5a shows how the focus diameter 2w fi of a first beam 25 to the beam quality number Ki increases to a focus diameter 2w f2 when the beam quality number K 2 of the modified beam 26 is less than Ki.
  • the change in the beam quality number can either internally, ie by interfering with the laser process itself, or externally, ie on the beam path from the laser to the workpiece, z. B. by introducing a diffractive optical element 33, take place.
  • the other beam parameters are assumed to be constant.
  • Fig. 5b shows the influence of the change of the beam diameter on the focusing lens 24 during the drilling process on the respective focus diameter. While the original laser beam 19 with a larger diameter sharp focus diameter 2w f i is obtained, resulting from a reduction of the beam diameter on the lens (beam 23) is a magnification of the focus diameter 2w f3. It can clearly be seen here how strongly the entire shape of the focus caustics changes, which produces the desired significant influence on the hole shape.
  • Fig. 5c finally shows the influence of a change in the divergence of the laser beam during the drilling process on the focus position.
  • the laser beam 22 having a divergence increased from the original beam 19 has a focus position shifted by the amount ⁇ z from the focus of the original beam in the direction of increasing the distance of the focusing lens.
  • Fig. 6 illustrates the latter two variants of the beam modification in more detail.
  • the original beam 19 by means of an adaptive optics 20 in the It can be changed so that a laser beam with a changed divergence 22 (Fig. 6a) or a laser beam with a different diameter 23 (Fig. 6b) results, which are each focused by the focusing lens 24 in the direction of workpiece 1.
  • the focus position 27 of the uninfluenced beam 21 and the focal position 28 of the laser beam with different divergence 22 are different
  • the laser beam with reduced diameter 23 has an enlarged diameter 29 compared to the original focus.
  • FIG. 7 shows a possibility of drilling the desired holes by means of a two-stage process in which the entire drilling process is divided into a pre-drilling section and a forming-drilling section.
  • FIG. 7 a illustrates the predrilled blind hole 14 produced in the first method step, which is produced for example by means of a laser of short-wave radiation or alternative methods, such as machining, spark erosion or precision ultrasonic machining.
  • the second method step (FIG. 7b)
  • boring of the hole 18 to the final shape takes place, for example, by means of a laser of long-wave radiation, in particular of a CO 2 laser.
  • Analogous is the procedure illustrated in FIG. 8. The only difference is that in the first method step by means of one of the above-mentioned methods, a complete through hole 15 of the workpiece takes place, which is widened again to the final shape 18 in the second method step.
  • FIG. 9 A further modification of the two-stage procedure is illustrated in FIG. 9.
  • the main concern here is the optimum protection of the sharp upper edge of the bore with the diameter d A produced in the first drilling phase.
  • Fig. 9b shows, while the focus waist was placed over the workpiece surface by a defined amount ⁇ z.
  • d A is slightly larger than the diameter of the beam waist. If one moves now the focal point by the amount .DELTA.z down, thus on the workpiece surface, the sharp upper edge of the hole is made only by so weak marginal rays of the bundle, that no melting takes place.
  • optimal conditions for the drilling of the hole to the final shape with the fluid inlet diameter d E are created.
  • V 1 Volume of the transition or compression zone 5

Abstract

L'invention concerne un trou d'injection pour la pulvérisation de fluides, dont le volume total est divisé en trois zones selon des rapports définis de leurs volumes, de telle sorte qu'un comportement d'écoulement optimal du fluide par le trou soit garanti. La zone d'admission (30, 104) qui constitue la plus grande partie du volume total sert à transporter le fluide présentant une faible résistance à l'écoulement, en évitant la cavitation, sur une distance représentant plus de 50 % de la longueur de trou totale, jusqu'à la deuxième zone, à savoir la zone de transition ou de compression (31, 105), dans laquelle le fluide est accéléré à une vitesse d'écoulement aussi élevée que possible dans des conditions techniques d'écoulement favorables. A cet effet, son volume doit être sensiblement inférieur à celui de la zone d'admission. Dans la troisième zone adjacente (32, 106), à savoir la zone d'éjection du trou d'injection dont le volume est à nouveau sensiblement réduit, le fluide présente toutes les propriétés d'écoulement permettant de garantir une pulvérisation optimale dans la chambre de travail et d'éviter des effets néfastes tels que la cokéfaction.
PCT/EP2010/002378 2009-04-20 2010-04-19 Buse présentant au moins un trou d'injection pour la pulvérisation de fluides WO2010121767A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009017788A DE102009017788A1 (de) 2007-10-25 2009-04-20 Düse mit mindestens einem Spritzloch zum Zerstäuben von Fluiden
DE102009017788.4 2009-04-20

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WO2010121767A1 true WO2010121767A1 (fr) 2010-10-28

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8237083B2 (en) 2007-10-25 2012-08-07 Prelatec Gmbh Method for boring bottle-like holes having a defined geometry by means of pulsed laser radiation
WO2012167990A1 (fr) * 2011-06-09 2012-12-13 Robert Bosch Gmbh Soupape d'injection pour moteurs à combustion interne
CH705454A1 (de) * 2011-08-31 2013-03-15 Efi Hightech Ag Einspritzdüse mit Flaschenhals-Spritzlöchern.

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2528915A1 (fr) * 1982-06-18 1983-12-23 Semt Injecteur de combustible et moteur a combustion interne equipe dudit injecteur
JPS5987271A (ja) * 1982-11-09 1984-05-19 Yanmar Diesel Engine Co Ltd デイ−ゼル機関用燃料噴射弁
DE10105674A1 (de) * 2001-02-08 2002-08-29 Siemens Ag Kraftstoffeinspritzdüse für eine Brennkraftmaschine
US20020158152A1 (en) * 1998-10-15 2002-10-31 Robert Bosch Gmbh Fuel injection nozzle for self-igniting internal combustion engines
DE10219608A1 (de) * 2002-05-02 2003-11-20 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10315967A1 (de) * 2003-04-08 2004-10-21 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10340931A1 (de) * 2003-09-05 2005-03-31 Herbert Walter Verfahren und Vorrichtung zum Bohren feinster Löcher
EP2009276A1 (fr) * 2007-06-26 2008-12-31 Delphi Technologies, Inc. Profilé de trou d'atomisation
EP2048354A1 (fr) * 2006-07-25 2009-04-15 Yanmar Co., Ltd. Procédé permettant de former un trou d'injection pour injecteur

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2528915A1 (fr) * 1982-06-18 1983-12-23 Semt Injecteur de combustible et moteur a combustion interne equipe dudit injecteur
JPS5987271A (ja) * 1982-11-09 1984-05-19 Yanmar Diesel Engine Co Ltd デイ−ゼル機関用燃料噴射弁
US20020158152A1 (en) * 1998-10-15 2002-10-31 Robert Bosch Gmbh Fuel injection nozzle for self-igniting internal combustion engines
DE10105674A1 (de) * 2001-02-08 2002-08-29 Siemens Ag Kraftstoffeinspritzdüse für eine Brennkraftmaschine
DE10219608A1 (de) * 2002-05-02 2003-11-20 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10315967A1 (de) * 2003-04-08 2004-10-21 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10340931A1 (de) * 2003-09-05 2005-03-31 Herbert Walter Verfahren und Vorrichtung zum Bohren feinster Löcher
EP2048354A1 (fr) * 2006-07-25 2009-04-15 Yanmar Co., Ltd. Procédé permettant de former un trou d'injection pour injecteur
EP2009276A1 (fr) * 2007-06-26 2008-12-31 Delphi Technologies, Inc. Profilé de trou d'atomisation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8237083B2 (en) 2007-10-25 2012-08-07 Prelatec Gmbh Method for boring bottle-like holes having a defined geometry by means of pulsed laser radiation
WO2012167990A1 (fr) * 2011-06-09 2012-12-13 Robert Bosch Gmbh Soupape d'injection pour moteurs à combustion interne
CH705454A1 (de) * 2011-08-31 2013-03-15 Efi Hightech Ag Einspritzdüse mit Flaschenhals-Spritzlöchern.

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