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WO2017005556A1 - Injecteur pour système d'injection de carburant - Google Patents

Injecteur pour système d'injection de carburant Download PDF

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Publication number
WO2017005556A1
WO2017005556A1 PCT/EP2016/065053 EP2016065053W WO2017005556A1 WO 2017005556 A1 WO2017005556 A1 WO 2017005556A1 EP 2016065053 W EP2016065053 W EP 2016065053W WO 2017005556 A1 WO2017005556 A1 WO 2017005556A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle
nozzle needle
injection
needle
fuel
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.)
Ceased
Application number
PCT/EP2016/065053
Other languages
German (de)
English (en)
Inventor
Michael Leukart
Ferdinand Nicolai
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 WO2017005556A1 publication Critical patent/WO2017005556A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F02M61/04—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
    • 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
    • F02M51/0675—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 the valve body having cylindrical guiding or metering portions, e.g. with fuel passages
    • F02M51/0678—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 the valve body having cylindrical guiding or metering portions, e.g. with fuel passages all portions having fuel passages, e.g. flats, grooves, diameter reductions
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/001—Control chambers formed by movable sleeves

Definitions

  • the invention relates to an injection nozzle for a fuel injection system, can be introduced with the fuel under high pressure in a combustion chamber of an internal combustion engine.
  • the invention is based on an injection nozzle for fuel injection systems, as known for example from the document DE 102 37 003 AI.
  • a fuel injection valve has a nozzle body, in which a piston-shaped nozzle needle is arranged longitudinally displaceable, which cooperates by its longitudinal movement with a nozzle seat and thus opens and closes one or more injection openings.
  • the nozzle needle is arranged in a pressure chamber within the nozzle body, which is filled with fuel under high pressure when the fuel injection valve, the part of which is the injection nozzle, in operation.
  • the control of the longitudinal movement of the nozzle needle takes place by the variation of the pressure in a control chamber, the pressure applied to the nozzle seat facing away from the nozzle needle with fuel pressure, wherein the pressure in the control chamber by means of a control valve is adjustable. If the pressure in the control chamber decreases, the hydraulic closing force on the nozzle needle also drops, and the nozzle needle is lifted off the nozzle seat by the fuel pressure in the pressure chamber and releases the injection openings. To close the nozzle needle, the fuel pressure in the control chamber is raised again so that the nozzle needle moves back into contact with the nozzle seat and closes the injection openings.
  • the movement of the nozzle needle should be done as quickly as possible in order to realize several, very quickly successive injections.
  • the nozzle needle on the one hand must have the lowest possible mass to react accordingly fast to the changing hydraulic pressures with a corresponding longitudinal movement.
  • the nozzle needle but also have a high stability, since the attacking hydraulic forces are very high and the requirements for the mechanical stability of the nozzle needle accordingly.
  • the injection nozzle according to the invention for a fuel injection system has the advantage that the nozzle needle has a mechanical stability which is almost identical to the solid design, but a significantly lower one
  • the injection nozzle on a nozzle body with a fillable with fuel at high pressure pressure chamber in which a piston-shaped, a longitudinal axis having nozzle needle is arranged longitudinally displaceable.
  • the nozzle needle cooperates with a nozzle seat for opening and closing at least one injection opening, wherein a slot-shaped recess is formed in the nozzle needle, which starting from the surface of the nozzle needle comprises at least part of the volume of the nozzle needle through which the longitudinal axis passes.
  • the slot-shaped recess which comprises the volume of the nozzle needle, in which the longitudinal axis extends
  • the outer structures of the nozzle needle remain virtually unchanged, so that the same or almost the same bending stability of the nozzle needle is achieved as in a solid version.
  • the weight of the nozzle needle is significantly reduced, which allows shorter switching times and thus in particular injections that follow each other very quickly, such as it is necessary for pre- and post-injections in modern, high-speed internal combustion engines.
  • a plurality of slot-shaped recesses are formed in the nozzle needle.
  • material can be very effectively removed from the nozzle needle, without the stability, in particular the bending stability, being substantially impaired.
  • the slot-shaped recesses penetrate the nozzle needle, so they extend from one surface of the nozzle needle to the other, they can be particularly well and inexpensively.
  • the recesses penetrate such that viewed in the cross section of the nozzle needle, a cross-shaped recess is formed.
  • At least two of the recesses are formed offset from one another in the longitudinal direction of the nozzle needle. In this way, material can be removed over the entire length of the nozzle needle, which is particularly advantageous in so-called long needles, as used in leak-free fuel injection systems.
  • FIG. 1 shows a longitudinal section through an injection nozzle according to the invention, wherein only the essential parts are shown,
  • FIG. 2 a shows a cross section through the illustrated nozzle needle of FIG
  • FIG. 2b shows a cross section through the nozzle needle of FIG. 2 along the line BB
  • FIG. 3 shows a further exemplary embodiment of a nozzle needle according to the invention
  • FIG. 4 shows a cross section through the nozzle needle of FIG. 3 along the line
  • FIG. 1 shows an injection nozzle according to the invention, as used in fuel injection systems with which fuel can be injected under high pressure into combustion chambers of internal combustion engines.
  • the injection nozzle shown in Figure 1 has a nozzle body 2, in which a pressure chamber 4 is formed, which can be filled with fuel under high pressure.
  • the nozzle body 2 In the installed position in an internal combustion engine, the nozzle body 2 forms part of a fuel injector which has the connection for the supply of the fuel under high pressure.
  • a piston-shaped nozzle needle 5 is arranged longitudinally displaceable, which has a longitudinal axis 11 and at its combustion chamber end forms a sealing surface 7, with which the nozzle needle 5 cooperates with a nozzle seat 8, which - as well as the sealing surface 7 - essentially a conical Form has.
  • the nozzle needle 5 With its end facing away from the nozzle seat 8, the nozzle needle 5 is guided in a sleeve 12, wherein between the sleeve 12 and a support ring 15 which is supported on a shoulder 16 of the nozzle needle 5, a helical compression spring 14 is arranged under pressure bias, by their bias voltages on the one hand the Nozzle needle 5 is pressed against the nozzle seat 8 and on the other hand, the sleeve 12 against a throttle plate, not shown in the figure 1.
  • a control chamber 13 is limited, in which a likewise not shown in the drawing control valve, an alternating fuel pressure is adjustable.
  • a plurality of slot-shaped recesses 20 are provided, as shown in the figure 2 again enlarged, showing the nozzle needle 5 without the associated nozzle body 5.
  • two slot-shaped recesses 20 are provided, which intersect in the longitudinal axis 11, so that a cross-shaped recess 20 can be seen in cross-section in the nozzle needle 5, as shown in Figure 2a, where a cross-section through the nozzle needle 5 is shown along the line AA.
  • the material is removed mainly in the interior of the nozzle needle 5, ie in the region through which the longitudinal axis 11 extends, so that although a large weight saving of the nozzle needle 5 results, but the bending stiffness of the nozzle needle 5 barely is impaired, since the flexural rigidity of the nozzle needle 5 is essentially determined by the outer structures of the nozzle needle 5, which are largely intact.
  • the so-called guide portion with which the nozzle needle 5 is guided within the pressure chamber 4, three slot-shaped recesses 20 'are provided, which extends at an angle of 120 ° in the region of the longitudinal axis 11, so that a Y-shaped cavity in the nozzle needle 5 is formed in cross-section, as shown in Figure 2b in a cross section of the nozzle needle 5 along the line BB.
  • the arrangement of three slot-shaped recesses 20 ' is advantageous, leave the correspondingly large areas on the nozzle needle 5 and a secure guidance of Nozzle needle 5 in the pressure chamber 4 contribute.
  • FIG. 3 shows a further exemplary embodiment of a nozzle needle 5 'according to the invention.
  • nozzle needle 5 ' are also a plurality of slot-shaped recesses 20 are provided, which also penetrate one another, as shown in Figure 2a already shown, but they are also arranged offset in the longitudinal direction of the nozzle needle 5', so that a weight saving over the entire length of the nozzle needle 5 'is possible.
  • a nozzle needle 5 ' as shown in Figure 3, for example, used in injectors that use a so-called long needle, so operate leak-free.
  • FIG. 4 shows a cross section through the nozzle needle 5 'of FIG. 3 along the line IV-IV.

Landscapes

  • 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

Injecteur (1) pour système d'injection de carburant, comprenant un corps de buse (2) dans lequel est formé un compartiment sous pression (4) qui est apte à être rempli de carburant et dans lequel une aiguille d'injecteur (5) en forme de piston et présentant un axe longitudinal (11) est apte à coulisser longitudinalement et coopère avec le siège de buse (8) pour ouvrir et fermer au moins un orifice d'injection (10). L'aiguille d'injecteur (5) abrite un évidement (20; 20') en forme de fente, lequel comprend au moins une partie du volume de l'aiguille d'injecteur (5) à partir de la surface de l'aiguille d'injecteur (5), à travers lequel passe l'axe longitudinal (11).
PCT/EP2016/065053 2015-07-03 2016-06-28 Injecteur pour système d'injection de carburant Ceased WO2017005556A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015212467.3A DE102015212467A1 (de) 2015-07-03 2015-07-03 Einspritzdüse für ein Kraftstoffeinspritzsystem
DE102015212467.3 2015-07-03

Publications (1)

Publication Number Publication Date
WO2017005556A1 true WO2017005556A1 (fr) 2017-01-12

Family

ID=56292709

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/065053 Ceased WO2017005556A1 (fr) 2015-07-03 2016-06-28 Injecteur pour système d'injection de carburant

Country Status (2)

Country Link
DE (1) DE102015212467A1 (fr)
WO (1) WO2017005556A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017116214A1 (de) * 2017-07-18 2019-01-24 L'orange Gmbh Düsennadel für einen Kraftstoffinjektor, Kraftstoffinjektor sowie Einspritzsystem für eine Brennkraftmaschine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19712590A1 (de) * 1997-03-26 1998-10-01 Bosch Gmbh Robert Elektromagnetisch betätigbares Ventil
EP2664779A1 (fr) * 2012-05-15 2013-11-20 Robert Bosch GmbH Soupape pour le dosage de fluide
EP2803850A1 (fr) * 2013-05-16 2014-11-19 Continental Automotive GmbH Pointeau de soupape pour injecteur de fluide, ensemble de pointeau de soupape, ensemble de soupape et injecteur de carburant

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10237003A1 (de) 2002-08-13 2004-03-18 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19712590A1 (de) * 1997-03-26 1998-10-01 Bosch Gmbh Robert Elektromagnetisch betätigbares Ventil
EP2664779A1 (fr) * 2012-05-15 2013-11-20 Robert Bosch GmbH Soupape pour le dosage de fluide
EP2803850A1 (fr) * 2013-05-16 2014-11-19 Continental Automotive GmbH Pointeau de soupape pour injecteur de fluide, ensemble de pointeau de soupape, ensemble de soupape et injecteur de carburant

Also Published As

Publication number Publication date
DE102015212467A1 (de) 2017-01-05

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