EP3191706B1 - Aiguille d'injecteur pour dispositif d'injection de carburant et dispositif d'injection de carburant - Google Patents

Aiguille d'injecteur pour dispositif d'injection de carburant et dispositif d'injection de carburant Download PDF

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Publication number
EP3191706B1
EP3191706B1 EP15744224.5A EP15744224A EP3191706B1 EP 3191706 B1 EP3191706 B1 EP 3191706B1 EP 15744224 A EP15744224 A EP 15744224A EP 3191706 B1 EP3191706 B1 EP 3191706B1
Authority
EP
European Patent Office
Prior art keywords
nozzle needle
needle tip
receptacle
tip
nozzle
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.)
Not-in-force
Application number
EP15744224.5A
Other languages
German (de)
English (en)
Other versions
EP3191706A1 (fr
Inventor
Wilhelm Christ
Lars Ulrich
Maike Hekel
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 EP3191706A1 publication Critical patent/EP3191706A1/fr
Application granted granted Critical
Publication of EP3191706B1 publication Critical patent/EP3191706B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M61/04—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
    • 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
    • F02M61/166—Selection of particular materials
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90—Selection of particular materials
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90—Selection of particular materials
    • F02M2200/9007—Ceramic materials
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90—Selection of particular materials
    • F02M2200/9092—Sintered materials

Definitions

  • the invention relates to a nozzle needle for a fuel injection device according to the preamble of claim 1. Furthermore, the invention relates to a fuel injection device using a nozzle needle according to the invention.
  • a generic nozzle needle is from the DE 10 2004 028 617 A1 the applicant known.
  • the known nozzle needle has a sleeve-shaped nozzle needle shaft which is connected to the injection openings facing side with a nozzle needle tip.
  • the nozzle needle tip is made of sintered metal, while the nozzle needle shaft, for example, consists of tool steel.
  • the nozzle needle shaft is connected on the opposite side of the nozzle needle tip with a formed as a separate component, sleeve-shaped guide portion, which also consists of sintered metal.
  • the mushroom-shaped nozzle needle tip has a substantially conical shape in the area protruding from the nozzle needle shaft.
  • the nozzle needle tip has a cylindrically shaped fastening region, wherein between the fastening region of the nozzle needle tip and the inner wall of the nozzle needle shaft a frictional connection is formed by a shrink or press connection.
  • DE102008041165 also shows a nozzle needle wherein the attachment of the nozzle needle tip to the nozzle needle shaft cohesively, positively or non-positively.
  • a disadvantage of the known from the cited document nozzle needle is that although the respective function can be optimized by the choice of different materials for the nozzle needle shaft and the nozzle needle tip, forming a shrink or press connection between the nozzle needle shaft and the nozzle needle tip due to the relatively low Diameter of the components and the manufacturing tolerances, however, is relatively expensive or a high-quality and accurate production of the components is required.
  • the production of a different shapes or diameter having nozzle needle tip in the event that it consists of sintered metal relatively easy, the formation of a nozzle needle tip of a different material or by means of another manufacturing technique in which a blank is shaped accordingly or . must be machined, but is relatively expensive.
  • a nozzle needle is known in which the nozzle needle tip is received in a blind hole-shaped receptacle of a nozzle needle shaft. Furthermore, the nozzle needle tip is arranged to be movable in the axial direction of the nozzle needle shaft, wherein a sleeve likewise arranged in the nozzle needle shaft in the region of the recess limits the stroke of the nozzle needle tip in the direction of the injection openings of the fuel injector.
  • the nozzle needle known from the cited document makes it possible, by pressurizing with the fuel pressure in the recess on the rear side of the nozzle needle tip, to move the nozzle needle tip to the nozzle needle shaft in a timely manner in order to open or close in time injection openings formed, for example, at different regions of a nozzle body ,
  • the nozzle needle is designed relatively expensive.
  • the invention has the object, a nozzle needle for a fuel injector, in particular a fuel injector, according to the preamble of claim 1 such that a structurally simplified and manufacturing technology particularly advantageous embodiment of the nozzle needle is achieved.
  • a nozzle needle for a fuel injection device with the features of claim 1 solved that the nozzle needle shaft has a formed by a blind hole receiving the nozzle needle tip, the reason of recording forms an axial stop for the nozzle needle tip, and that the nozzle needle tip within the receptacle has a constant diameter, which simultaneously forms the largest diameter of the nozzle needle tip.
  • the nozzle needle according to the invention makes it possible, for example, to allow a sliding fit between the nozzle needle tip and the receptacle in the nozzle needle shaft.
  • the area of the nozzle needle tip which acts hydraulically in the direction of the bottom of the nozzle needle shaft is larger than the hydraulic surface of the nozzle needle shaft acting in the same direction.
  • Such a design causes the nozzle needle tip is always acted upon in the opening direction of the nozzle needle with a larger hydraulic force than the nozzle needle shaft, so that the nozzle needle tip is always pressed in the direction of the bottom in the recording of the nozzle needle shaft.
  • Such a design makes it possible in particular to dispense with a press fit between the nozzle needle shaft and the nozzle needle tip, so that the components are relatively inexpensive to produce due to the lower tolerance requirements.
  • this consists of a wear-resistant material such as ceramic, hard metal or a sapphire and the nozzle needle shaft of a solid material made of steel.
  • a wear-resistant material such as ceramic, hard metal or a sapphire
  • the nozzle needle shaft of a solid material made of steel.
  • the nozzle needle tip has a conically shaped seating area, which adjoins directly to the arranged inside the receptacle, cylindrically shaped region of the nozzle needle tip.
  • the nozzle needle shaft in the mouth region of the receptacle has a conical outer surface, and that extending in the direction of the outer surface extension of the seat portion of the nozzle needle tip spaced from the outer surface.
  • a transition or clearance fit is formed between the nozzle needle tip and the receptacle.
  • a particularly simple or inexpensive manufacturability of the components due to a relatively large tolerance range of the components is made possible and beyond simplifies the assembly process to the effect that the insertion of the nozzle needle tip into the receptacle of the nozzle needle shaft can be particularly easily.
  • At least one leakage gap is formed between the nozzle needle tip and the receptacle.
  • This leakage gap can either be conditioned solely by the tolerance position of the components, or else, preferably, by a targeted processing, for example, the nozzle needle tip in the form of a longitudinal groove or the like. Such a configuration causes a slightly delayed movement between the nozzle needle shaft and the nozzle needle tip for releasing injection openings.
  • the invention also includes a fuel injection device with a housing for guiding a nozzle needle according to the invention.
  • a nozzle needle 10 according to the invention for a in the Fig. 3 shown fuel injector 100 in the form of a fuel injector, in particular a fuel injector for use in a self-igniting internal combustion engine, shown.
  • the fuel injector is part of a so-called common rail system, is injected at the high-pressure fuel in the combustion chamber of an internal combustion engine, as is prior art and therefore will not be explained in the further course.
  • the nozzle needle 10 consists essentially of two separate components, a nozzle needle shaft 11 and a nozzle needle tip 12.
  • the nozzle needle shaft 11 consists of a solid material, in particular of machine steel, and is substantially cylindrical or rod-shaped.
  • the nozzle needle shaft 11 has a plurality of guide portions 13 in a central region, which serve to the nozzle needle shaft 11 and the nozzle needle 10 in the direction of its longitudinal axis 14 by abutment against the inner wall 16 of the in Fig. 3 shown injector 18 to lead radially.
  • the nozzle needle shaft 11 has a receptacle 20 in the form of a blind hole 21 for receiving the nozzle needle tip 12.
  • the blind hole 21 having a constant diameter D has a base 22 which serves as an axial stop for the nozzle needle tip 12 in the direction of the nozzle needle tip 12 opposite end 23 of the nozzle needle shaft 11 is used.
  • the end 23 dips by way of example into a control space of the fuel injector, not shown, in order to control the movement of the nozzle needle 10 for opening or closing of injection openings 26 formed in the injector housing 18 in a known manner.
  • the nozzle needle tip 12 is made of a different material than the nozzle needle shaft 11, in particular of a wear-resistant material such as ceramic, carbide or a sapphire.
  • the nozzle needle tip 12 has at least within the receptacle 20 on a cylindrical portion 24 with an at least approximately constant diameter d, wherein the diameter d of the portion 24 and the diameter D of the blind hole 21 are coordinated such that preferably a transition or clearance fit between the Nozzle needle tip 12 and the nozzle needle shaft 11 is formed, and wherein the diameter d at the same time forms the largest diameter of the nozzle needle tip 12.
  • the diameters d, D are matched to one another such that an interference fit is formed between the nozzle needle tip 12 and the nozzle needle shaft 11.
  • at the periphery of the section 24 leakage grooves or the like. are formed (not shown) to allow a defined flow of fuel in the region of the bottom 22 of the blind hole 21.
  • a conically formed seating area 25 adjoins the receptacle 20.
  • the seating area 25 is designed to be in the in the Fig. 3 illustrated closed position of the nozzle needle 10 to close the injection openings 26.
  • the seating area 25 bears sealingly against the inner wall 16 of the injector housing 18.
  • the nozzle needle shaft 11 has a conically shaped outer surface 28 in the mouth region of the receptacle 20 or the blind hole 21.
  • a trained in extension of the seat portion 25 straight line 29 extends at a distance from the outer periphery 28 of the nozzle needle shaft 11th
  • nozzle needle 10 or the fuel injection system 100 described so far can be varied or modified in many ways without deviating from the inventive concept, as defined in the appended claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (7)

  1. Aiguille d'injecteur (10) pour un dispositif d'injection de carburant (100), en particulier un injecteur de carburant, comprenant une pointe d'aiguille d'injecteur (12) qui est connectée à une tige d'aiguille d'injecteur (11), la pointe d'aiguille d'injecteur (12) et la tige d'aiguille d'injecteur (11) se composant de matériaux différents, la tige d'aiguille d'injecteur (11) présentant un logement (20) pour la pointe d'aiguille d'injecteur (12), formé par un alésage borgne (21), la base (22) du logement (20) constituant une butée axiale pour la pointe d'aiguille d'injecteur (12), et que la pointe d'aiguille d'injecteur (12) présente, à l'intérieur du logement (20), un diamètre (d) au moins approximativement constant qui constitue en même temps le plus grand diamètre de la pointe d'aiguille d'injecteur (12),
    caractérisée en ce que
    la surface de la pointe d'aiguille d'injecteur (12) agissant hydrauliquement dans la direction de la base (22) du logement (20) est plus grande que la surface hydraulique de la tige d'aiguille d'injecteur (11) agissant dans la même direction de telle sorte que la pointe d'aiguille d'injecteur (12) soit constamment sollicitée par force dans la direction de la base (22) du logement (20).
  2. Aiguille d'injecteur selon la revendication 1,
    caractérisée en ce que
    la pointe d'aiguille d'injecteur (12) se compose d'un matériau résistant à l'usure tel que de la céramique, du métal dur ou un saphir et la tige d'aiguille d'injecteur (11) se compose d'un matériau massif en acier.
  3. Aiguille d'injecteur selon l'une quelconque des revendications 1 ou 2,
    caractérisée en ce que
    la pointe d'aiguille d'injecteur (12) présente une région de siège (25) de forme conique qui se raccorde à une portion (24) réalisée sous forme cylindrique à l'intérieur du logement (20).
  4. Aiguille d'injecteur selon la revendication 3,
    caractérisée en ce que
    la tige d'aiguille d'injecteur (11) présente, dans la région d'embouchure du logement (20), une surface extérieure conique (28), et en ce qu'un prolongement (29) de la région de siège (25) s'étendant dans la direction de la surface extérieure (28), s'étend à distance de la surface extérieure (28).
  5. Aiguille d'injecteur selon l'une quelconque des revendications 1 à 4,
    caractérisée en ce
    qu'entre la pointe d'aiguille d'injecteur (12) et le logement (20) est réalisé un ajustement de transition ou un ajustement avec jeu.
  6. Aiguille d'injecteur selon la revendication 5,
    caractérisée en ce
    qu'au moins un interstice de fuite est réalisé entre la pointe d'aiguille d'injecteur (12) et le logement (20).
  7. Dispositif d'injection de carburant (100) comprenant un boîtier (18) pour guider une aiguille d'injecteur (10), l'aiguille d'injecteur (10) étant réalisée selon l'une quelconque des revendications 1 à 6.
EP15744224.5A 2014-09-08 2015-07-30 Aiguille d'injecteur pour dispositif d'injection de carburant et dispositif d'injection de carburant Not-in-force EP3191706B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014217935.1A DE102014217935A1 (de) 2014-09-08 2014-09-08 Düsennadel für eine Kraftstoffeinspritzeinrichtung und Kraftstoffeinspritzeinrichtung
PCT/EP2015/067483 WO2016037761A1 (fr) 2014-09-08 2015-07-30 Aiguille d'injecteur pour dispositif d'injection de carburant et dispositif d'injection de carburant

Publications (2)

Publication Number Publication Date
EP3191706A1 EP3191706A1 (fr) 2017-07-19
EP3191706B1 true EP3191706B1 (fr) 2018-06-13

Family

ID=53761396

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15744224.5A Not-in-force EP3191706B1 (fr) 2014-09-08 2015-07-30 Aiguille d'injecteur pour dispositif d'injection de carburant et dispositif d'injection de carburant

Country Status (4)

Country Link
US (1) US20170260949A1 (fr)
EP (1) EP3191706B1 (fr)
DE (1) DE102014217935A1 (fr)
WO (1) WO2016037761A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3236046C2 (de) * 1982-09-29 1986-03-20 Daimler-Benz Ag, 7000 Stuttgart Kraftstoffeinspritzdüse für Brennkraftmaschinen
US5409165A (en) * 1993-03-19 1995-04-25 Cummins Engine Company, Inc. Wear resistant fuel injector plunger assembly
DE69922087T2 (de) * 1998-06-24 2005-12-01 Delphi Technologies, Inc., Troy Brennstoffeinspritzdüse
GB9913314D0 (en) 1999-06-09 1999-08-11 Lucas Ind Plc Fuel injector
DE102004028617A1 (de) 2004-06-12 2005-12-29 Robert Bosch Gmbh Düsennadel
DE102008041165A1 (de) * 2008-08-11 2010-02-18 Robert Bosch Gmbh Einspritzventilglied

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
WO2016037761A1 (fr) 2016-03-17
US20170260949A1 (en) 2017-09-14
EP3191706A1 (fr) 2017-07-19
DE102014217935A1 (de) 2016-03-10

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