EP3768962A1 - Injecteur de carburant - Google Patents

Injecteur de carburant

Info

Publication number
EP3768962A1
EP3768962A1 EP19713386.1A EP19713386A EP3768962A1 EP 3768962 A1 EP3768962 A1 EP 3768962A1 EP 19713386 A EP19713386 A EP 19713386A EP 3768962 A1 EP3768962 A1 EP 3768962A1
Authority
EP
European Patent Office
Prior art keywords
fuel injector
valve
sealing surface
holding body
valve piece
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
EP19713386.1A
Other languages
German (de)
English (en)
Other versions
EP3768962B1 (fr
Inventor
Thomas Nierychlo
Joachim Soubari
Philipp Wachter
Fabian FISCHER
Oezguer Tuerker
Axel Schnaufer
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 EP3768962A1 publication Critical patent/EP3768962A1/fr
Application granted granted Critical
Publication of EP3768962B1 publication Critical patent/EP3768962B1/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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/03—Fuel-injection apparatus having means for reducing or avoiding stress, e.g. the stress caused by mechanical force, by fluid pressure or by temperature variations
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/803—Fuel injection apparatus manufacture, repair or assembly using clamp elements and fastening means; e.g. bolts or screws

Definitions

  • the invention relates to a fuel injector, in particular a common rail injector for self-igniting internal combustion engines, having the features of the preamble of claim 1.
  • a generic fuel injector is known from DE 10 2014 225 293 A1 of the Applicant.
  • the known fuel injector is characterized by a switching valve with a valve seat, which is formed on a valve piece.
  • valve piece is received in a holding body of the fuel injector and axially pressed by means of a valve clamping screw against a stepped shoulder on the holding body, wherein the shoulder and the valve piece form a sealing area with two sealing surfaces.
  • the valve clamping screw acts with the interposition of a triangular-shaped pressure ring in cross-section against a radially circumferential on the valve piece, obliquely arranged surface.
  • the cooperating with a front side of a magnet armature valve seat on the valve piece is used indirectly to actuate a nozzle needle. It is essential that, on the one hand, the armature stroke of the magnet armature can be set so high that seat throttling at the valve seat is avoided, and that the armature stroke on the other side is as small as possible in order to achieve a desired dynamic of the magnet armature at a relatively low level allow electrical power of the Magnetak- sector.
  • the fuel injector according to the invention with the features of claim 1 has the advantage that even at relatively high system or fuel pressures in the fuel injector, the maximum armature stroke is relatively little reduced. As a result, a relatively small armature stroke can be set when setting the maximum armature stroke during the production of the fuel injector, which is advantageous both for the desired armature dynamics and for the lowest possible energy requirement for the magnetic actuator.
  • the invention is based on the idea of reducing the deformation of the valve piece in the axial direction, even at relatively high operating pressures, by means of an advantageous geometric configuration between the sealing surfaces on the valve piece and on the holding body.
  • a force introduction caused by the hydraulic pressure in the valve piece, is changed in such a way that the deformation forces acting in the longitudinal direction of the valve piece are reduced.
  • the formed on the valve piece first sealing surface which cooperates with a second sealing surface, is arranged at an oblique angle with respect to the longitudinal axis of the valve piece.
  • Such an arrangement of the first sealing surface at an oblique angle favors a modified with respect to the prior art introduction of the hydraulic forces in the valve piece and leads to a reduction in the longitudinal expansion.
  • the first sealing surface is arranged on an enlarged diameter portion of the valve piece on a clamping element facing away from the end face.
  • the second sealing surface is formed monolithic and counter to the first sealing surface on the holding body. Such a design of the second sealing surface makes it possible to form the (oblique) second sealing surface without the use of separate components.
  • the second sealing surface is formed on a separate from the holding body, annular member.
  • the separate component has a triangular shape in cross section and one is provided with a third sealing surface arranged perpendicular to the longitudinal axis, which cooperates with a fourth sealing surface formed on the holder body ,
  • the component enclosing wall of the holding body is formed a radial gap.
  • the separate component consists of a material which is different from the material of the holder body and / or the material of the valve member.
  • the invention is further characterized in that the switching valve has a cooperating with the valve seat armature as an actuator of the switching valve.
  • the advantageous effects of the fuel injector are achieved if it is designed to be operated at a system pressure of over 2000 bar.
  • FIG. 1 shows a partial longitudinal section through a first preferred embodiment of a fuel injector according to the invention in the region of the switching valve
  • Fig. 2 shows a detail of Fig. 1 in a modified from the first embodiment of the embodiment of the holding body.
  • the fuel injector 10 shown in detail in FIG. 1 is designed as a so-called common-rail injector and serves to inject fuel into the combustion chamber, not shown, of a self-igniting internal combustion engine. machine.
  • the injection or system pressure may be more than 2000bar in particular.
  • the fuel injector 10 has a holding body 12, in which a valve piece 14 is arranged as part of a switching valve 15.
  • the valve member 14 has a bore into which an axial end portion of a nozzle needle 16 dips.
  • the nozzle needle 16 is arranged in a liftable manner along a longitudinal axis 18, which simultaneously forms the longitudinal axis 18 of the valve piece 14.
  • the control of the stroke movement of the nozzle needle 16 takes place by means of the switching valve 15 in a manner known per se.
  • the valve member 14, together with an end face of the nozzle needle 16, delimits a control chamber 20, which is filled via not shown holes with fuel under system pressure.
  • the control chamber 20 can be relieved of pressure via a drain bore 22 with integrated drain throttle 24 via a valve seat 26 formed on the valve piece 14 in the direction of a low-pressure region 40 of the fuel injector 10.
  • the release or closing of the valve seat 26 takes place by means of a magnet armature 28 which is arranged to be movable in a stroke and which is guided, for example, radially inside a peripheral wall 30 of the valve piece 14.
  • the armature 28 cooperates with a magnetic coil 32, not shown in detail, which builds up a magnetic field when energized, which pulls the magnet armature 28 in the direction of the magnet coil 32 and thereby releases the valve seat 26 on the valve piece 14.
  • the control chamber 20 is relieved of pressure, which leads to an upward movement of the nozzle needle 16 in the direction of the magnet armature 28 and thus to the release of at least one injection opening (not shown) on the fuel injector 10.
  • the end face 34 of the magnetic coil 32 or of a magnetic core 35 facing the magnetic armature 28 forms an upper stroke stop for the magnet armature 28 by way of example, so that the stroke of the magnetic armature 28 is defined by the distance between the upper end face 36 of the magnet armature 28 and its facing end face 34 of the magnetic coil 32 and the magnetic core 35 is defined or limited.
  • valve piece 14 In order to hydraulically separate a high-pressure space 38 formed within the holding body 12 from the low-pressure area 40 of the fuel injector 10 under system pressure, it is necessary for the valve piece 14 to be arranged pressure-tight relative to the holding body 12.
  • a valve Clamping screw 42 use, the tee against a flat top surface 44 of the valve 14 in the region of an enlarged diameter portion 46 of the Ven- til culturess 14 presses and the valve member 14 thus in the direction of a formed on the holding body 12, radially circumferential and flat shoulder 48th with a force of an axial force.
  • this axial force acts on the holding body 12 with the interposition of a ring-shaped element designed as a separate component 50.
  • the component 50 is arranged in operative connection with an obliquely arranged surface 52 on the valve piece 14 on the valve clamping screw 42 facing away from the end face.
  • This surface 52 forms a first sealing surface 53, where at an angle a between the first sealing surface 53 and the longitudinal axis 18 between 30 and 60 °, preferably 45 °.
  • the formed on the one triangular cross-section member 50 formed, with the first surface 53 Dichtflä cooperating and counter-trained second sealing surface 54 causes a seal to the valve member 14 out.
  • a radial gap 58 is formed between the outer circumference of the component 50 and the valve piece 14 and a receiving bore 56 of the holding body 12.
  • the component 50 has, on the side facing the shoulder 48, a third sealing surface 59 which cooperates with the shoulder 48 acting as the fourth sealing surface 60 on the holding body 12.
  • the component 50 consists either of the same material as the holding body 12 and / or the valve member 14, or from a relation to the holding body 12 and / or the valve member 14 different material. 1 that the outer diameter D A of the component 50 is smaller than the inner diameter Di of the recess 62 of the holding body 12.
  • a modified fuel injector 10a is shown in which is dispensed with a separate component 50.
  • the holding body 12a at the point at which the component 50 is provided in the fuel injector 10 has an obliquely formed second sealing surface 54a, which is monolithically formed on the holder body 12a, in particular by a grinding process.
  • the first sealing surface 54a interacts with the opposite first sealing surface 53 on the valve piece 14 which is identical to the valve member 14 of the fuel injector 10.

Landscapes

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

Abstract

L'invention concerne un injecteur de carburant (10; 10a), en particulier un injecteur pour injection à rampe commune, comportant une soupape de commande (15) destinée à assurer la commande au moins indirecte de la course de levée d'un pointeau d'injecteur (16), ladite soupape de commande (15) comportant une pièce de soupape (14) dotée d'un siège de soupape (26), ladite pièce de soupape (14) étant montée dans un corps de retenue (12; 12a) et étant contrainte au moyen d'un élément de serrage (42), en particulier au moyen d'une vis de serrage de soupape, axialement en direction du corps de retenue (12; 12a), et la pièce de soupape (14) étant montée de manière étanche par rapport au corps de retenue (12; 12a) à l'encontre une zone haute pression (38) et présentant à cet effet une surface d'étanchéité (53) réalisée sur la pièce de soupape (14) et s'étendant autour d'un axe longitudinal (18) de la pièce de soupape (14) dans le sens radial, ladite première surface d'étanchéité coopérant avec une seconde surface d'étanchéité (54; 54a).
EP19713386.1A 2018-03-23 2019-03-19 Injecteur de carburant Active EP3768962B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018204492.9A DE102018204492A1 (de) 2018-03-23 2018-03-23 Kraftstoffinjektor
PCT/EP2019/056766 WO2019179976A1 (fr) 2018-03-23 2019-03-19 Injecteur de carburant

Publications (2)

Publication Number Publication Date
EP3768962A1 true EP3768962A1 (fr) 2021-01-27
EP3768962B1 EP3768962B1 (fr) 2022-12-21

Family

ID=65911127

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19713386.1A Active EP3768962B1 (fr) 2018-03-23 2019-03-19 Injecteur de carburant

Country Status (4)

Country Link
EP (1) EP3768962B1 (fr)
CN (1) CN111902627B (fr)
DE (1) DE102018204492A1 (fr)
WO (1) WO2019179976A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10018663A1 (de) * 2000-04-14 2001-10-25 Siemens Ag Einspritzventil mit optimierter Flächengeometrie zwischen einem Düsenkörper und einer Spannmutter
DE10220931C1 (de) * 2002-05-10 2003-11-27 Siemens Ag Injektor zur Kraftstoffeinspritzung
DE102005006818A1 (de) * 2005-02-15 2006-08-17 Volkswagen Mechatronic Gmbh & Co. Kg Dichtungseinrichtung für einen Kraftstoffinjektor sowie Verfahren zum Abdichten
DE102008005523A1 (de) * 2008-01-23 2009-07-30 Robert Bosch Gmbh Kraftstoffinjektor
DE102014225293A1 (de) * 2014-12-09 2016-06-09 Robert Bosch Gmbh Kraftstoffinjektor

Also Published As

Publication number Publication date
WO2019179976A1 (fr) 2019-09-26
CN111902627A (zh) 2020-11-06
CN111902627B (zh) 2022-12-27
EP3768962B1 (fr) 2022-12-21
DE102018204492A1 (de) 2019-09-26

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Inventor name: WACHTER, PHILIPP

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