EP3073107A1 - Soupape d'injection de carburant pour moteurs a combustion interne et utilisation d'une soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant pour moteurs a combustion interne et utilisation d'une soupape d'injection de carburant Download PDF

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Publication number
EP3073107A1
EP3073107A1 EP16152533.2A EP16152533A EP3073107A1 EP 3073107 A1 EP3073107 A1 EP 3073107A1 EP 16152533 A EP16152533 A EP 16152533A EP 3073107 A1 EP3073107 A1 EP 3073107A1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection valve
inflow
section
longitudinal axis
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
EP16152533.2A
Other languages
German (de)
English (en)
Other versions
EP3073107B1 (fr
Inventor
Beate Grota
Gerhard Suenderhauf
Michael Leukart
Uli Herz
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
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Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3073107A1 publication Critical patent/EP3073107A1/fr
Application granted granted Critical
Publication of EP3073107B1 publication Critical patent/EP3073107B1/fr
Active 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
    • F02M61/16—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
    • F02M61/1806—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
    • 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
    • F02M61/184—Discharge orifices having non circular sections
    • 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
    • F02M2200/06—Fuel-injection apparatus having means for preventing coking, e.g. of fuel injector discharge orifices or valve needles

Definitions

  • the invention relates to a fuel injection valve for internal combustion engines according to the preamble of claim 1. Furthermore, the invention relates to the use of a fuel injection valve according to the invention.
  • a fuel injection valve according to the preamble of claim 1 is known from EP 1 599 670 B1 the applicant known.
  • the known fuel injection valve has in a blind bore of its valve body a total of three sections which connect directly to each other in the direction of a longitudinal axis of the blind hole.
  • a first portion serves to form a seat portion for a sealing surface of a nozzle needle when it is in its lowered closed position.
  • a second, conically formed section serves as a transition section to a likewise conical third section, in the region of which at least one injection opening is formed.
  • the injection opening is formed as a cylindrically shaped injection opening, the mouth region is formed on the side facing the blind bore relatively sharp-edged.
  • the conical injection opening is provided on the side facing the blind bore with a radius, so that a rounded trained inflow is formed.
  • the inflow region is formed exclusively in the region or the section of the blind bore in which the at least one injection opening is located.
  • Such different flow velocities over the cross section of the injection opening considered can be, for example, by means of a fuel injection valve according to the EP 1 382 840 A1 the applicant.
  • This has a cross section in the region of injection openings out of round or polygonal-shaped injection member (nozzle needle).
  • an injection element with a round cross section is disclosed with a non-circular or non-uniform blind hole in the cross-section.
  • the invention has the object, a fuel injection valve for internal combustion engines according to the preamble of claim 1 such that at least an optimization of the flow characteristics for the fuel in the sense of minimizing hydraulic losses is achieved.
  • a fuel injection valve for internal combustion engines having the characterizing features of claim 1, characterized in that the at least one injection opening on the first portion of the blind hole facing side has a preferably convex first inflow, and that the first inflow in the direction of the longitudinal axis the blind hole is looking up in the first portion, in which the seat portion is formed to form the sealing seat with the nozzle needle, extends.
  • Such a configuration of the first inflow region causes the fuel after passing through the seat portion in the region of the first portion to flow relatively smoothly and with a small deflection angle in the direction of the at least one injection opening.
  • relatively “gentle” deflections of the fuel lead to relatively low hydraulic losses and thus to an optimization of the flow guidance of the fuel when injecting the fuel into the combustion chamber of an internal combustion engine.
  • the at least one injection opening additionally has a second, convex inflow area within the first inflow area.
  • the second inflow region has a greater curvature than the first inflow region, wherein the second inflow region is formed by a radius in the sense of a production technology particularly preferred embodiment.
  • this is formed in the valve body as an egg-shaped recess and has a longitudinal axis which runs at least substantially parallel to the longitudinal axis of the blind hole.
  • the egg-shaped form in particular between the at least one injection opening and the area of the seat portion, maximizes a first inflow area with respect to the length, so that the curvature of the convexly formed first inflow area in this area can be chosen to be relatively small.
  • the region beneath the at least one injection opening is thereby formed at least substantially without the first inflow region, so that the dead volume in the blind hole in the region below the nozzle needle is minimized.
  • the first section has a transition section on the side facing the second section, that the seat section is on the side of the transition section facing away from the second section is arranged, and that the inflow area viewed in the direction of the longitudinal axis of the blind hole bore extends into the transition section and ends in front of the seat portion.
  • transition section and the seat section are each conical, and that the cone angle of the nozzle seat section is greater than that of the transition section.
  • the second section has a cylindrical basic shape.
  • An optimization of the fuel injection valve with regard to the tendency to smallest possible deposits in the region of the injection openings is achieved if a plurality of injection openings are provided, wherein considered between the injection openings in the circumferential direction of the blind hole areas are formed in which no first inflow regions are formed.
  • a stronger deflection of the fuel in the direction of the injection opening additional turbulence are generated in these areas, which reduce the tendency to deposits in the mouth region of the blind hole.
  • the use of the fuel injection valve according to the invention in self-igniting internal combustion engines, in which the system pressure is more than 2000bar, is particularly advantageous.
  • Fig. 1 is the one not shown combustion chamber of an internal combustion engine facing end portion of a fuel injection valve 10 according to the invention shown.
  • the fuel injection valve 10 is preferably part of a so-called common-rail system for self-igniting internal combustion engines, wherein the system pressure is in particular more than 2000bar.
  • the fuel injection valve 10 has a valve body 11, in which a blind hole 12 is formed with a longitudinal axis 13.
  • the blind hole 12 has a first portion 15, in the region of which a seat portion 16 is formed, which forms a sealing seat in a lowered position with a nozzle needle 20 serving as an injection member together with a sealing surface 21 of the nozzle needle 20.
  • the nozzle needle 20 is only partially shown for reasons of clarity.
  • the first portion 15 of the blind bore 12 is conical in the illustrated embodiment, but may in principle be equipped with a convex surface or have a radius.
  • a second section 22 adjoins the first section 15.
  • a plurality of injection openings 25 are preferably formed in the valve body 11 to allow the injection of the fuel into the combustion chamber, not shown, of the internal combustion engine.
  • the injection openings 25 are located in relation to the longitudinal axis 13 within the blind hole 12 on a pitch circle diameter about the longitudinal axis 13 and extend in the illustrated embodiment is not perpendicular to the longitudinal axis 13, but somewhat obliquely thereto.
  • the second portion 22 which has a cylindrical basic shape in the illustrated embodiment, extends in the axial direction of the longitudinal axis 13 at least over the entire region of the injection openings 25 to the second portion 22 of the blind hole 12 closes the curved base formed 26 of the blind hole 12th at.
  • a radially encircling transition 28 is arranged, which may be formed either in the form of an edge, or in the form of a radius.
  • the orifice region 30 of the injection orifices 25 having, for example, a constant cross section or constant diameter is formed with an inflow region 31 on the side facing the blind bore 12.
  • the inflow region 31 is formed with a radius r, at least in the direction of the first section 15, but preferably radially circumferentially with respect to the injection opening 25.
  • the injection openings 25 are provided with a further, convex inflow region 32 which completely surrounds the inflow region 31.
  • the further inflow region 32 is formed as an egg-shaped recess 33 within the wall of the blind bore 12.
  • the further inflow region 32 has a longitudinal axis 34 which extends at least substantially parallel to the longitudinal axis 13 of the blind bore 12. It is essential to the invention that the further inflow region 32, which extends only slightly beyond the region of the injection opening 25 in the direction of the base 26 of the blind bore 12, extends beyond the transition 28 on the side facing the first section 15.
  • the further inflow regions 32 are only slightly wider via the transition 28 into the area of the first section 15.
  • regions 29 are formed without inflow regions 32 between the further inflow regions 32 in the blind bore 12 in the circumferential direction, such that the wall of the blind bore 12 is formed exclusively by the shape of the second section 22.
  • the further inflow region 32 has a convex wall 35, wherein the convex shape of the wall 35 can also be formed, for example, by a constant radius.
  • the curvature of the further inflow region 32 is less than the curvature or the radius r of the inflow region 31.
  • the first portion 15 a on the second portion 22 side facing a transition portion 36 is likewise conical, with the cone angle of the transition section 36 being smaller than the cone angle of the first section 15a in the region of the seat section 16a.
  • a second transition 37th is formed between the transition portion 36 and the second portion 22 of the transition 28 and between the transition portion 36 and the seat portion 16 a, a second transition 37th
  • the fuel injection valve 10, 10a described so far can be modified or modified in many ways, without departing from the spirit of the invention.
  • the shape of the inflow 32 should not be limited to a convex shape, but may for example also funnel or conical shaped.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP16152533.2A 2015-03-25 2016-01-25 Soupape d'injection de carburant pour moteurs a combustion interne et utilisation d'une soupape d'injection de carburant Active EP3073107B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015205423.3A DE102015205423A1 (de) 2015-03-25 2015-03-25 Kraftstoffeinspritzventil für Brennkraftmaschinen und Verwendung des Kraftstoffeinspritzventils

Publications (2)

Publication Number Publication Date
EP3073107A1 true EP3073107A1 (fr) 2016-09-28
EP3073107B1 EP3073107B1 (fr) 2020-05-27

Family

ID=55229608

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16152533.2A Active EP3073107B1 (fr) 2015-03-25 2016-01-25 Soupape d'injection de carburant pour moteurs a combustion interne et utilisation d'une soupape d'injection de carburant

Country Status (2)

Country Link
EP (1) EP3073107B1 (fr)
DE (1) DE102015205423A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1382840A1 (fr) 2002-07-16 2004-01-21 Robert Bosch Gmbh Soupape d'injection de carburant pour un moteur a combustion interne
WO2005103481A1 (fr) * 2004-04-24 2005-11-03 Robert Bosch Gmbh Injecteur de carburant pour moteurs diesel a combustion interne
EP1599670B1 (fr) 2003-02-25 2008-03-19 Robert Bosch Gmbh Buse d'injection a trou borgne et a siege perfore destinee a un moteur a combustion interne et presentant un cone de transition entre le trou borgne et le siege d'aiguille de buse
DE102008041676A1 (de) 2008-08-29 2010-03-04 Robert Bosch Gmbh Brennstoffeinspritzventil
JP2010180763A (ja) * 2009-02-04 2010-08-19 Nippon Soken Inc 燃料噴射ノズル
DE102012211156A1 (de) * 2012-06-28 2014-01-23 Robert Bosch Gmbh Kraftstoffinjektor
WO2014108338A1 (fr) * 2013-01-11 2014-07-17 Kw-Technologie Gmbh & Co. Kg Dispositif de pulvérisation de liquide dans un espace de travail

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1382840A1 (fr) 2002-07-16 2004-01-21 Robert Bosch Gmbh Soupape d'injection de carburant pour un moteur a combustion interne
EP1599670B1 (fr) 2003-02-25 2008-03-19 Robert Bosch Gmbh Buse d'injection a trou borgne et a siege perfore destinee a un moteur a combustion interne et presentant un cone de transition entre le trou borgne et le siege d'aiguille de buse
WO2005103481A1 (fr) * 2004-04-24 2005-11-03 Robert Bosch Gmbh Injecteur de carburant pour moteurs diesel a combustion interne
DE102008041676A1 (de) 2008-08-29 2010-03-04 Robert Bosch Gmbh Brennstoffeinspritzventil
JP2010180763A (ja) * 2009-02-04 2010-08-19 Nippon Soken Inc 燃料噴射ノズル
DE102012211156A1 (de) * 2012-06-28 2014-01-23 Robert Bosch Gmbh Kraftstoffinjektor
WO2014108338A1 (fr) * 2013-01-11 2014-07-17 Kw-Technologie Gmbh & Co. Kg Dispositif de pulvérisation de liquide dans un espace de travail

Also Published As

Publication number Publication date
EP3073107B1 (fr) 2020-05-27
DE102015205423A1 (de) 2016-09-29

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