EP3768962B1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP3768962B1
EP3768962B1 EP19713386.1A EP19713386A EP3768962B1 EP 3768962 B1 EP3768962 B1 EP 3768962B1 EP 19713386 A EP19713386 A EP 19713386A EP 3768962 B1 EP3768962 B1 EP 3768962B1
Authority
EP
European Patent Office
Prior art keywords
valve
valve piece
fuel injector
sealing surface
holding body
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.)
Active
Application number
EP19713386.1A
Other languages
German (de)
English (en)
Other versions
EP3768962A1 (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

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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
    • 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 from DE 10 2014 225 293 A1 known to the applicant.
  • the well-known fuel injector is characterized by a switching valve with a valve seat that is formed on a valve piece.
  • the valve piece is accommodated in a holding body of the fuel injector and is pressed axially against a stepped shoulder on the holding body by means of a valve clamping screw, with the shoulder and the valve piece forming a sealing area with two sealing surfaces.
  • the valve clamping screw acts against an inclined surface that runs radially around the valve piece.
  • the valve seat on the valve piece which interacts with an end face of a magnet armature, serves 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 large that seat throttling on the valve seat is avoided, and that the armature stroke on the other hand is as small as possible in order to achieve the desired dynamics of the magnet armature with a relatively low electrical power of the magnet actuator to allow.
  • the trend in self-igniting internal combustion engines is towards ever higher system or fuel pressures, which can typically be more than 2000 bar, in the future more than 2500 bar.
  • the fuel pressure inside the fuel injector also acts on the valve piece via a high-pressure chamber and thus causes a reduction in the maximum armature stroke, since the valve piece or the valve seat together with the magnet armature moves upwards when the upper armature stroke stop is stationary, or from the high-pressure chamber in which the nozzle needle is arranged is pressed.
  • the fuel injector according to the invention has the advantage that even with relatively high system or fuel pressures in the fuel injector, the maximum armature stroke is reduced relatively little. As a result, when setting the maximum armature lift during production of the fuel injector, a relatively small armature lift can be set, 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 design between the sealing surfaces on the valve piece and on the holding body.
  • the proposed geometry in the area of the sealing surfaces changes the introduction of force, caused by the hydraulic pressure in the valve piece, in such a way that the deformation forces acting in the longitudinal direction of the valve piece are reduced.
  • the teaching of the invention proposes that the first sealing surface formed on the valve piece, which interacts with a second sealing surface, is arranged at an oblique angle in relation to the longitudinal axis of the valve piece.
  • Such an arrangement of the first sealing surface at an oblique angle favors a modified introduction of the hydraulic forces into the valve piece compared to the prior art and leads to a reduction in its longitudinal expansion.
  • the oblique angle on the first sealing surface of the valve piece is between 30° and 60°. This is because this angle or angle range represents a compromise between the assembly capability required due to tolerances on the one hand and the tightness required due to the inclined position of the reaction force acting on the first sealing surface to minimize vertical seat deformation on the other.
  • the first sealing surface is arranged on a section of the valve piece with an enlarged diameter on an end face facing away from the clamping element, and the second sealing surface is monolithic and is designed to be opposite to the first sealing surface on the holding body.
  • the switching valve has a magnet armature that interacts with the valve seat as an actuator of the switching valve.
  • the beneficial effects of the fuel injector are achieved when it is designed to be operated with a system pressure of over 2000 bar.
  • the Indian 1 The fuel injector 10 shown in part and not according to the invention is designed as a so-called common rail injector and is used to inject fuel into the combustion chamber (not shown) of a self-igniting internal combustion engine.
  • the injection or system pressure can in particular be more than 2000 bar.
  • 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 piece 14 has a bore into which an axial end area of a nozzle needle 16 dips.
  • the nozzle needle 16 is arranged such that it can be lifted along a longitudinal axis 18 which at the same time forms the longitudinal axis 18 of the valve piece 14 .
  • the lifting movement of the nozzle needle 16 is controlled by means of the switching valve 15 in a manner known per se.
  • the valve piece 14, together with an end face of the nozzle needle 16, delimits a control chamber 20, which is filled with fuel at system pressure via holes (not shown).
  • the pressure in the control chamber 20 can be relieved via a drain hole 22 with an 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 valve seat 26 is released or closed by means of a magnet armature 28 which is arranged such that it can lift and which is guided, for example, radially inside a peripheral wall 30 of the valve piece 14 .
  • the magnet armature 28 interacts with a magnet coil 32 (not shown in detail) which, when energized, builds up a magnetic field that 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 pressure in the control chamber 20 is relieved, which leads to an upward movement of the nozzle needle 16 in the direction of the magnet armature 28 and thus to a release of at least one injection opening (not shown) on the fuel injector 10 .
  • the end face 34 of the magnet coil 32 or of a magnet core 35 facing the magnet armature 28 forms, for example, an upper stroke stop for the magnet armature 28, so that the stroke of the magnet armature 28 is determined by the distance between the upper end face 36 of the magnet armature 28 and is defined or limited by the end face 34 of the magnetic coil 32 or the magnetic core 35 which faces it.
  • valve piece 14 In order to hydraulically separate a high-pressure chamber 38 that is formed within the holding body 12 and is under system pressure from the low-pressure region 40 of the fuel injector 10 , it is necessary for the valve piece 14 to be arranged in a pressure-tight manner with respect to the holding body 12 .
  • a valve clamping screw 42 is used for this purpose, which presses against a flat upper side 44 of the valve piece 14 in the area of a section 46 of the valve piece 14 with an enlarged diameter, and the valve piece 14 thus in the direction of a radially circumferential and flat shoulder 48 formed on the holding body 12 with a axial force applied.
  • this axial force acts on the holding body 12 with the interposition of an annular element designed as a separate component 50 .
  • the component 50 is operatively connected to an obliquely arranged surface 52 on the valve piece 14 on the end face remote from the valve clamping screw 42 .
  • This surface 52 forms a first sealing surface 53, with an angle ⁇ between the first sealing surface 53 and the longitudinal axis 18 being between 30° and 60°, preferably 45°.
  • the second sealing surface 54 embodied on the component 50 having a triangular cross-section, interacting with the first sealing surface 53 and having an opposite design, effects a seal towards the valve piece 14 .
  • 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 interacts with the shoulder 48 on the holding body 12 acting as the fourth sealing surface 60 .
  • the component 50 consists either of the same material as the holding body 12 and/or the valve piece 14, or of a different material than the holding body 12 and/or the valve piece 14. Furthermore, one recognizes from the 1 that the outer diameter D A of the component 50 is smaller than the inner diameter D I of the recess 62 of the holding body 12.
  • holding body 12a has an inclined second sealing surface 54a, which is monolithically formed on holding body 12a, in particular by means of a grinding process.
  • the first sealing surface 54a interacts with the opposite first sealing surface 53 on the valve piece 14, which is designed identically to the valve piece 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)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (4)

  1. Injecteur de carburant (10 ; 10a) doté d'une soupape de commutation (15) servant à la commande au moins indirecte du mouvement de va-et-vient d'une aiguille d'injecteur (16), la soupape de commutation (15) présentant une pièce de soupape (14) dotée d'un siège de soupape (26), la pièce de soupape (14) étant disposée dans un corps de retenue (12 ; 12a) et étant serrée axialement en direction du corps de retenue (12 ; 12a) au moyen d'un élément de serrage (42), en particulier au moyen d'une vis de serrage de soupape, et la pièce de soupape (14) étant disposée par rapport au corps de retenue (12 ; 12a) de manière étanche vis-à-vis d'une région haute pression (38) et présentant à cet effet une première surface d'étanchéité (53) réalisée sur la pièce de soupape (14) et périphérique radialement autour d'un axe longitudinal (18) de la pièce de soupape (14), laquelle surface d'étanchéité coopère avec une deuxième surface d'étanchéité (54 ; 54a),
    la première surface d'étanchéité (53) sur la pièce de soupape (14) étant disposée suivant un angle aigu (α) par rapport à l'axe longitudinal (18), l'angle aigu (α) valant entre 30° et 60°, caractérisé en ce que la première surface d'étanchéité (53) est disposée sur une partie (46), présentant un diamètre agrandi, de la pièce de soupape (14) sur un côté frontal opposé à l'élément de serrage (42), la deuxième surface d'étanchéité (54a) étant réalisée sur le corps de retenue (12a) de manière monolithique et opposée à la première surface d'étanchéité (53).
  2. Injecteur de carburant selon la revendication 1, caractérisé en ce que
    l'angle aigu (α) vaut 45°.
  3. Injecteur de carburant selon la revendication 1 ou 2, caractérisé en ce que
    la soupape de commutation (15) présente une armature magnétique (28) coopérant avec le siège de soupape (26).
  4. Injecteur de carburant selon la revendication 1, 2 ou 3, caractérisé en ce que
    l'injecteur de carburant (10 ; 10a) est réalisé pour fonctionner avec une pression de système de plus de 2000 bars.
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 EP3768962A1 (fr) 2021-01-27
EP3768962B1 true 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
EP3768962A1 (fr) 2021-01-27
CN111902627A (zh) 2020-11-06
CN111902627B (zh) 2022-12-27
DE102018204492A1 (de) 2019-09-26
WO2019179976A1 (fr) 2019-09-26

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