EP3999736A1 - Injecteur de carburant destiné à des moteurs à combustion interne - Google Patents

Injecteur de carburant destiné à des moteurs à combustion interne

Info

Publication number
EP3999736A1
EP3999736A1 EP20729044.6A EP20729044A EP3999736A1 EP 3999736 A1 EP3999736 A1 EP 3999736A1 EP 20729044 A EP20729044 A EP 20729044A EP 3999736 A1 EP3999736 A1 EP 3999736A1
Authority
EP
European Patent Office
Prior art keywords
edge
nozzle needle
fuel
longitudinal axis
blind hole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20729044.6A
Other languages
German (de)
English (en)
Other versions
EP3999736B1 (fr
Inventor
Fabian Wolf
Knut Kristian BAADSHAUG
Gerhard Suenderhauf
Andreas Koeninger
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 EP3999736A1 publication Critical patent/EP3999736A1/fr
Application granted granted Critical
Publication of EP3999736B1 publication Critical patent/EP3999736B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1866—Valve seats or member ends having multiple cones
    • 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
    • F02M61/06—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 the valves being furnished at seated ends with pintle or plug shaped extensions
    • 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
    • F02M61/1833—Discharge orifices having changing cross sections, e.g. being divergent
    • 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
    • F02M61/1893—Details of valve member ends not covered by groups F02M61/1866 - F02M61/188

Definitions

  • the invention relates to a fuel injector for internal combustion engines, such as is used in particular as a component of a so-called common rail injection system for compression ignition internal combustion engines for applications with relatively high maximum flow rates or injection quantities.
  • a fuel injector for internal combustion engines with the features of
  • the preamble of claim 1 is known from DE 10 2016 116 690 A1.
  • the injector is characterized by a nozzle needle with a needle tip which, in the direction of a blind hole bottom of a nozzle body, has a cylindrical section below a conical section with two edges running radially around a longitudinal axis of the nozzle needle, with the second one facing the blind hole bottom in a closed position of the nozzle needle Edge below a lower inlet edge of an injection opening, in a partially open position of the nozzle needle the first edge facing away from the bottom of the blind hole below an upper one
  • the second edge is arranged above the lower inlet edge of the injection opening.
  • Such a design of the needle tip of the nozzle needle is intended in particular to enable a stable flow between the nozzle needle, the blind hole and the injection opening or to make it unstable
  • the fuel injector according to the invention for internal combustion engines with the features of claim 1 has, in addition to the desired properties such as achieving a stable flow with a simultaneously low harmful volume, the main advantage that its tendency to cavitation in a partial stroke area of the nozzle needle, in which the cross-sectional area in the area of the seat between the The nozzle needle and the nozzle body is smaller than the cross section of the
  • Injection openings below the nozzle seat is significantly reduced.
  • a high flow efficiency is achieved in the full stroke range of the nozzle needle.
  • Fuel injector according to the invention solved in that the diameter of the nozzle needle in the area of the first edge is greater than the diameter of the nozzle needle in the area of the second edge, and that a distance between the two edges in the direction of the longitudinal axis is 0.4 times to 1, 6 times a diameter of the injection opening in an inlet area to the blind hole in the non-rounded state of the inlet area corresponds.
  • the nozzle needle has at least one conical section between the two edges of the needle tip.
  • the nozzle needle prefferably be of cylindrical design between the two edges.
  • the nozzle needle is convex or concave between the two edges. Regardless of the shape of the nozzle needle in the axial end area or in the area of the needle tip, there is another structurally preferred one
  • Configuration provides that the nozzle needle has a cylindrically formed section between the first edge and the sealing surface on the nozzle seat.
  • nozzle needle As an alternative to a cylindrical section between the first edge and the sealing surface in the region of the nozzle body, provision can also be made for the nozzle needle to be concave there
  • the second edge delimits a flat end face of the needle tip.
  • the needle tip is conical on the side of the second edge facing away from the first edge.
  • the blind hole in the nozzle body has a cylindrical section which merges into a rounded blind hole base, and that the transition between the cylindrical section and the rounded blind hole base between the upper and lower inlet edge of the Injection opening is arranged, the longitudinal axis of the injection opening preferably intersecting the transition.
  • a further optimization of the fuel flow in the direction of the injection opening provides that the injection opening is rounded in the inlet area to the blind hole.
  • Fig. 1 shows an axial end portion of an inventive
  • FIG. 2 shows a detail of FIG. 1 in the area of an injection opening on
  • FIG. 5 shows the fuel injector according to FIG. 1 with its nozzle needle in different positions, each in a partial longitudinal section
  • FIG. 12 shows further variations of the geometry of the nozzle needle in FIG. 12
  • FIGS. 1 to 5 there is a fuel injector 10 for injecting fuel into the combustion chamber, not shown, of a self-igniting one
  • the injector 10 faces the combustion chamber of the internal combustion engine.
  • the fuel injector 10 is part of a so-called common rail injection system for self-igniting
  • the system pressure preferably being more than 2000 bar.
  • the illustrated fuel injector 10 is preferably used in applications that require relatively high maximum flow rates.
  • the fuel injector 10 has a nozzle body 12 in which a blind hole 14 is formed.
  • the blind hole 14 has a section 16 which is conical about a longitudinal axis 15 of the nozzle body 12 and which forms a seat surface 17.
  • the section 16 merges into a cylindrical section 18, to which a rounded blind hole bottom 20 adjoins. In the transition area between the cylindrical portion 18 and the
  • Blind hole bottom 20 opens at least one as a through hole in the
  • the injection opening 22 is arranged at an inclined angle a with respect to the longitudinal axis 15, a longitudinal axis 23 of the injection opening 22 preferably intersecting the transition between the cylindrical section 18 and the bottom of the blind hole 20 (FIG. 2).
  • the inlet region 24 of the injection opening 22 is equipped with a rounding 25.
  • the nozzle body 12 described so far acts to inject fuel into the combustion chamber of the internal combustion engine via the at least one
  • Injection opening 22 together with a nozzle needle 26 arranged to be movable along the longitudinal axis 15.
  • the nozzle needle 26 is
  • Injection opening 22 released so that the fuel can be injected into the combustion chamber of the internal combustion engine.
  • the sealing surface 28 of the nozzle needle 26 merges on the side facing the blind hole base 20 into a cylindrical section 35 as part of a needle tip 34, which is in turn adjoined by a conical section 36.
  • the end face 38 of the nozzle needle 26 facing the blind hole bottom 20 is designed as a flat end face 38, that is, perpendicular to the longitudinal axis 15.
  • the transition between the cylindrical section 35 and the conical section 36 of the nozzle needle 26 forms a first edge 41 running radially around the longitudinal axis 15 and having a first diameter Di.
  • the end face 38 forms a second edge 42 running radially around the longitudinal axis 15 with a second edge
  • the second diameter D2 is smaller than the first diameter Di. Furthermore, an axial distance a is formed between the two edges 41, 42 viewed in the direction of the longitudinal axis 15. The distance a is 0.4 times to 1.6 times the diameter d of the injection opening 22 outside the inlet area 24, i.e. in the cylindrical area of the
  • Injection port 22 Injection port 22.
  • FIG. 3 the closed position of the nozzle needle 26 in the nozzle body 12 is shown.
  • the second edge 42 is located axially in the direction of
  • a partially open nozzle needle 26 is shown.
  • the first edge 41 is located below an upper inlet edge 45 of the injection opening 22, viewed in the axial direction of the longitudinal axis 15. This has the effect that a primary flow 46, which reaches the area of the injection opening 22 directly from the inlet gap 32, is particularly favorable in terms of flow .
  • the opening position of the nozzle needle 26 shown in FIG. 4 is characterized in that the (annular) cross-section Asi tz in the area of the inlet gap 32 is smaller than the sum of the cross-sections A S L of the
  • the (fully) open state of the nozzle needle 26 is shown in FIG. 5.
  • the second edge 42 is preferably located below the upper inlet edge 45 of the injection opening 22, at most about 30 ⁇ m above it.
  • Such an arrangement causes a secondary flow 48, which from
  • Blind hole bottom 20 reaches the area of the injection openings 22, relatively little flow separation is generated in the area of the injection openings 22.
  • the (fully) open state of the nozzle needle 26 is characterized in that the cross-section Asi tz of the inlet gap 32 is greater than the sum of the cross-sections A S L of the injection openings 22.
  • FIG. 6 shows a nozzle needle 26a that is modified from FIGS. 1 to 5. This is characterized in that instead of the conical section 36, a cylindrical section 49 between the cylindrical
  • Section 35 and the end face 38 is provided.
  • the first edge 41 is located in the transition from the section 35 to the annular surface 50 connecting the sections 35 and 49.
  • the transition from the cylindrical section 35 to the (flat) end face 38 has a convex or rounded section 51.
  • the nozzle needle 26c shown in FIG. 8 has a concave section 52 instead of the convex section 51.
  • 9 shows the case in the nozzle needle 26d in which the transition between the cylindrical section 35 and the (flat) end face 38 is formed by two conical sections 53, 54 that have different angles to the longitudinal axis 15.
  • a nozzle needle 26e is shown in which the sealing surface
  • a conical section 55 adjoins it in the direction of the cylindrical section 35.
  • the conical section 55 has an angle ⁇ which is greater by a maximum of 8.5 ° than an angle g between the sealing surface 28 and a line parallel to the longitudinal axis 15.
  • FIG. 11 shows a nozzle needle 26f, in which the transition between the sealing surface 28 and the first edge 41 takes place through a concave section 56.
  • FIG. 12 shows the case in which the nozzle needle 26g is basically shaped like the nozzle needle 26f, but the end face 38e is inclined or conical.

Landscapes

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

Abstract

L'invention concerne un injecteur de carburant (10) destiné à des moteurs à combustion interne, comportant un corps de buse (12) dans lequel est réalisé un trou borgne (14) dont part au moins une ouverture d'injection (22), et comportant une aiguille de buse (26 ; 26a à 26g) agencée mobile dans le corps de buse (12) de façon longitudinale, sur laquelle aiguille de buse est réalisée, sur le côté orienté vers le trou borgne (14), une surface d'étanchéité (28), avec laquelle surface l'aiguille de buse (26 ; 26a à 26g) coopère, afin de commander un écoulement de carburant vers ladite ouverture d'injection (22), avec une surface de siège (17) du corps de buse (12), et comportant une pointe d'aiguille (34) qui présente un premier rebord (41) radialement circonférentiel autour d'un axe longitudinal (15) comportant un premier diamètre (D1), auquel se rattache, dans la direction du fond de trou borgne (20), un second bord (42) radialement circonférentiel autour de l'axe longitudinal (15) comportant un second diamètre (D2).
EP20729044.6A 2019-07-18 2020-05-27 Injecteur de carburant destiné à des moteurs à combustion interne Active EP3999736B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019210631.5A DE102019210631A1 (de) 2019-07-18 2019-07-18 Kraftstoffinjektor für Brennkraftmaschinen
PCT/EP2020/064627 WO2021008763A1 (fr) 2019-07-18 2020-05-27 Injecteur de carburant destiné à des moteurs à combustion interne

Publications (2)

Publication Number Publication Date
EP3999736A1 true EP3999736A1 (fr) 2022-05-25
EP3999736B1 EP3999736B1 (fr) 2024-05-08

Family

ID=70918441

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20729044.6A Active EP3999736B1 (fr) 2019-07-18 2020-05-27 Injecteur de carburant destiné à des moteurs à combustion interne

Country Status (5)

Country Link
US (1) US20230130775A1 (fr)
EP (1) EP3999736B1 (fr)
CN (1) CN114502834B (fr)
DE (1) DE102019210631A1 (fr)
WO (1) WO2021008763A1 (fr)

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5882068A (ja) * 1981-11-09 1983-05-17 Nissan Motor Co Ltd 燃料噴射ノズル
JP3183156B2 (ja) * 1995-04-27 2001-07-03 株式会社デンソー 流体噴射ノズル
DE19942370A1 (de) * 1999-09-04 2001-03-22 Bosch Gmbh Robert Einspritzdüse für Brennkraftmaschinen mit einer Ringnut in der Düsennadel
DE10246693A1 (de) * 2002-10-07 2004-04-15 Siemens Ag Einspritzvorrichtung zum Einspritzen von Kraftstoff
DE10354878A1 (de) * 2003-11-24 2005-06-09 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung, insbesondere für eine Brennkraftmaschine mit Kraftstoff-Direkteinspritzung, sowie Verfahren zu ihrer Herstellung
JP4480763B2 (ja) * 2004-05-11 2010-06-16 トムソン ライセンシング 投射系
JP3989495B2 (ja) * 2004-09-22 2007-10-10 トヨタ自動車株式会社 燃料噴射装置
EP2369166B1 (fr) * 2010-03-22 2017-12-13 Delphi International Operations Luxembourg S.à r.l. Buse à injection
JP5842728B2 (ja) * 2012-05-08 2016-01-13 株式会社日本自動車部品総合研究所 燃料噴射弁
DE102013212142A1 (de) * 2013-06-25 2015-01-08 Robert Bosch Gmbh Düsenbaugruppe für einen Kraftstoffinjektor sowie Kraftstoffinjektor
JP6109758B2 (ja) * 2014-01-30 2017-04-05 株式会社日本自動車部品総合研究所 燃料噴射ノズル
JP6474694B2 (ja) * 2015-06-24 2019-02-27 株式会社Ｓｏｋｅｎ 燃料噴射ノズル
JP2017031925A (ja) * 2015-08-05 2017-02-09 株式会社デンソー 燃料噴射装置
JP6510940B2 (ja) 2015-09-24 2019-05-08 株式会社Ｓｏｋｅｎ 燃料噴射弁
EP3252301B1 (fr) * 2016-06-02 2020-12-02 Caterpillar Motoren GmbH & Co. KG Injecteur de carburant pour un moteur à deux combustibles

Also Published As

Publication number Publication date
DE102019210631A1 (de) 2021-01-21
WO2021008763A1 (fr) 2021-01-21
CN114502834A (zh) 2022-05-13
CN114502834B (zh) 2024-06-14
US20230130775A1 (en) 2023-04-27
EP3999736B1 (fr) 2024-05-08

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