EP2123898B1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP2123898B1
EP2123898B1 EP20090100198 EP09100198A EP2123898B1 EP 2123898 B1 EP2123898 B1 EP 2123898B1 EP 20090100198 EP20090100198 EP 20090100198 EP 09100198 A EP09100198 A EP 09100198A EP 2123898 B1 EP2123898 B1 EP 2123898B1
Authority
EP
European Patent Office
Prior art keywords
control valve
valve element
fuel injector
pressure
sealing edge
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.)
Expired - Fee Related
Application number
EP20090100198
Other languages
German (de)
English (en)
Other versions
EP2123898A1 (fr
Inventor
Nadja Eisenmenger
Hans-Christoph Magel
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 EP2123898A1 publication Critical patent/EP2123898A1/fr
Application granted granted Critical
Publication of EP2123898B1 publication Critical patent/EP2123898B1/fr
Expired - Fee Related 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0043—Two-way valves
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F02M63/008—Hollow valve members, e.g. members internally guided

Definitions

  • the position of the sealing edge in contrast to the prior art is well defined, which can be realized in a simple manner in the closed position in the axial direction pressure compensated control valve.
  • a trained according to the concept of the invention fuel injector has a good tightness - even at very high pressures of over 2000 bar - on.
  • a further advantage is that the high-pressure side conical surface of the sections of double-conical Control valve seat member in the region of the fuel inlet to the control valve seat together with the seat of the control valve seat limited in the direction of the sealing edge tapered inlet gap. This results in a protection of the sealing edge against particles in the fuel, since arriving (larger) particles are partially stopped first in the inlet gap to the sealing edge and thus kept away from the sealing edge.
  • control valve element is in the closed state, at least approximately pressure-balanced in the axial direction, which means that the control valve element is designed such that act on this in its closed position no or only very small hydraulic forces.
  • This axial pressure balance can be achieved, for example, with a sleeve-shaped control valve element.
  • a sleeve-shaped control valve element is understood to mean a control valve element which has a, preferably centric, continuous opening or a continuous, if necessary also formed as a stepped bore channel, wherein in the channel, as will be explained later, a pressure pin can be added which axially closes the channel and which is preferably a separate component from the valve body having the control valve seat.
  • Fig. 1 is designed as a common-rail injector fuel injector 1 for injecting fuel into a combustion chamber, not shown, also shown an internal combustion engine, also not shown.
  • a high pressure pump 2 delivers fuel from a reservoir 3 in a high-pressure fuel storage 4 (Rail). In this fuel, especially diesel or gasoline, under high pressure, of about 2000 bar in this embodiment, stored.
  • the fuel injector 1 is connected, among other fuel injectors, not shown, via a supply line 5.
  • the supply line 5 discharges into a high-pressure reservoir 6 which acts as a mini-rail for minimizing the pressure oscillation and flows into the high pressure reservoir 6 in the axial direction into the combustion chamber of the internal combustion engine during an injection process.
  • the injection valve element 10 has at its tip 12 a closing surface 13 (sealing surface), with which the injection valve element 10 can be brought into a tight contact with an injection valve element seat 14 formed inside the nozzle body 11.
  • a closing surface 13 closing surface
  • a control chamber 22 is limited, via a radially extending in the sleeve-shaped portion 20 of the valve body 21 inlet throttle 23 with high-pressure fuel from the high-pressure reservoir 6 is supplied.
  • the sleeve-shaped portion 20 with the control chamber 22 enclosed therein is enclosed radially on the outside by high-pressure fuel, so that an annular guide gap 24 is comparatively fuel-tight radially between the sleeve-shaped portion 20 and the injection valve element 10.
  • an electromagnetic actuator 32 is provided with an electromagnet 33 which cooperates with the armature plate 31 which is arranged in an anchor plate space 34 and subsequently with the sleeve-shaped control valve element 28.
  • the electromagnetic actuator 32 raises the control valve element 28 from its arranged on the valve body 21, formed in this embodiment as an inner cone-shaped inner cone, control valve seat 35 from.
  • the flow cross sections of the inlet throttle 23 and the outlet throttle 26 are matched to one another such that when open control valve 29, a net outflow of fuel (fuel control amount) from the control chamber 22 in the low pressure region 30 of the fuel injector 1 and from there via the Injektor Weglaufan gleich 7 and Return line 8 results in the reservoir 3.
  • the pressure in the control chamber 22 drops rapidly, whereby the injection valve element 10 lifts off from an injection valve element seat 14, so that fuel can flow out of the high-pressure reservoir 6 through the nozzle hole arrangement 15.
  • the energization of the electromagnetic actuator 32 is interrupted, whereby the sleeve-shaped control valve element 28 is adjusted with a control spring 36 which is supported on the armature plate 31 in the drawing plane down to its control valve seat 35.
  • the fuel flowing in through the inlet throttle 23 into the control chamber 22 provides for a rapid pressure increase in the control chamber 22 and thus for a force acting on the injection valve element 10 Closing force.
  • the resulting closing movement of the injection valve element 10 is assisted by a closing spring 37, which is supported at one end on a circumferential collar 38 and at the other end on the lower, annular end face 39 of the sleeve-shaped section 20 of the valve body 21 in the plane of the drawing.
  • a loose pressure pin 42 is accommodated, which is designed as a separate component from the valve body 21.
  • the purpose of the cylindrical pressure pin 42 is to seal up the valve chamber 27 formed by the stepped bore 40 in the axial direction in order to prevent fuel from the drainage channel 25 from flowing into the low-pressure region 30 when the control valve element 28 is closed.
  • the pressure pin 42 further serves to guide the control valve element 28 at its inner periphery formed by the stepped bore 40 and the portion 41.
  • the sleeve-shaped, in the closed state in the axial direction pressure balanced control valve element 28 is guided on its outer circumference 43.
  • a guide section 44 protruding upward in the plane of the drawing is provided on the valve body 21, which surrounds the control valve element 28 radially on the outside.
  • the control valve seat 35 was made through the guide portion 44 of the valve body 21 in the axial direction. Holes 45 are radially introduced into the guide section 44, via which fuel flowing out of the outlet channel 25 when the control valve element 28 is open can flow radially outwards into the anchor plate space 34.
  • a radial channel 48 is introduced through the fuel into an annular chamber 49 in a support ring 46 which delimits the armature plate space 34 and carries the electromagnet arrangement 47 of the electromagnetic actuator 32 can flow, both the support ring 46 and Also, the solenoid assembly 47 radially encloses the outside.
  • a radial passage 50 which is axially spaced from the radial passage 48, the fuel from the annular chamber 49 can again flow radially inward toward the injector return port 7 and from there via the return line 8 to the reservoir 3.
  • Fig. 2 the sleeve-shaped control valve element 28 is shown in an enlarged view, wherein in the sleeve-shaped control valve element 28, the stepped bore 40 is introduced, which forms a closed by the pressure pin 42 through-channel.
  • the pressure pin 42 which is supported axially on a cover 51 of the fuel injector 1 has the function of sealing a formed inside the control valve element 28 valve chamber 27 in the axial direction upwards.
  • an inner channel 52 leads from the axial direction of the drawing plane below, wherein the inner channel 52 is formed by a lower surface in the drawing plane 53 of the stepped bore 40.
  • the diameter of the inner channel 52 is less than the diameter of the upper plane in the plane of the drawing 41 of the stepped bore 40th
  • annular sealing edge 54 is formed, which forms the line of contact or intersection of two axially adjacent, each cone-shaped conical surfaces 55, 56, wherein the two conical conical surfaces 55, 56 one another Cone angle (here cone angle) have. It is in the drawing plane lower conical surface 55 to a high pressure side and the axially immediately adjacent in the drawing plane upper conical surface 56 to a low-pressure side conical surface.
  • the lower in the drawing plane, high-pressure side Cone surface 55 in this case has a larger cone angle ⁇ , as in the drawing plane, axially adjacent, upper, low-pressure side cone surface 50 whose cone angle ⁇ is smaller.
  • a cone angle is understood to mean the angle between two diametrically opposite surface sections of the respective annular conical surface.
  • the sealing edge 54 formed axially between the conical surfaces 55, 56 cooperates in its closed position with the internal conical control valve seat 35, which is formed on the valve body 21.
  • the cone angle of the inner cone-shaped control valve seat 35 is smaller than the cone angle ⁇ between the lower in the drawing plane conical surfaces 55 and greater than the cone angle ⁇ between the upper in the drawing plane conical surfaces 56th
  • the radial extent R (here 150 ⁇ m) of the high-pressure side cone surface 55 a maximum of 15%, preferably not more than 10% of the diameter D I (here 2 mm) of the sealing edge 54 corresponds to negative flow influences of high pressure side conical surface 55 to minimize.
  • the high pressure applied within the control valve element 28 is the innermost diameter of the sealing edge 54, which is not ideally linear due to wear. In the case of a fuel injector 1 with external high pressure, it would be the act extreme diameter of the sealing edge 54.
  • Axially between the radially inner, high-pressure side conical surface 55 and the inner conical control valve seat 35 is formed in the radial direction to the sealing edge 54 tapered inlet gap 57, which in addition to a formed between the conical surface 55 and the inner channel 52 edge 58 for comminution contained in the fuel Contributes particles.
  • a particle 59 is shown in the transition between the drainage channel 25 and the sealing edge 54.
  • a particle 59 of this size does not flow directly to the sealing edge 54, but usually initially remains in the inlet gap 57 and is crushed during a closing movement of the control valve element 28 between the control valve element 28 and the high-pressure side conical surface 55. Alternatively, the particle is smashed by striking against the inlet gap 57 bounding edges and surfaces.

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  • 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)
  • Fuel-Injection Apparatus (AREA)

Claims (11)

  1. Injecteur de carburant, en particulier injecteur à rampe commune, pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne, comprenant un élément de soupape d'injection (10) qui peut être commandé au moyen d'une soupape de commande (29), la soupape de commande (29) présentant un élément de soupape de commande (28) en forme de douille, à compensation de pression au moins approximative dans sa position de fermeture, qui présente sur son côté tourné vers un siège de soupape de commande (35) une surface d'étanchéité qui peut être amenée en appui hermétique contre le siège de soupape de commande (35),
    caractérisé en ce que
    la surface d'étanchéité sur l'élément de soupape de commande (28) est formée par une arête d'étanchéité (54) réalisée entre une surface conique (55) côté haute pression et une surface conique (56) associée angulairement à celle-ci côté basse pression, et en ce que l'étendue radiale (R) de la surface conique côté haute pression (55) représente au maximum 15% du diamètre DI de l'arête d'étanchéité (54).
  2. Injecteur de carburant selon la revendication 1, caractérisé en ce que l'étendue radiale (R) de la surface conique côté haute pression (55) correspond au maximum à 10% du diamètre de l'arête d'étanchéité (54) et le diamètre de l'arête d'étanchéité (54) est compris entre environ 1,0 mm et environ 3,0 mm, de préférence entre environ 1,5 mm et environ 2,0 mm.
  3. Injecteur de carburant selon l'une quelconque des revendications 1 ou 2,
    caractérisé en ce que
    l'arête d'étanchéité (54) réalisée de préférence axialement entre les surfaces coniques (55, 56) coopère avec un siège de soupape de commande (35) en forme de cône interne.
  4. Injecteur de carburant selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le siège de soupape de commande (35) est réalisé sur un corps de soupape (21) limitant une chambre de commande (22).
  5. Injecteur de carburant selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'élément de soupape de commande (28) est complètement compensé en pression dans sa position de fermeture dans la direction axiale ou présente un étage de pression minimal agissant dans la direction de fermeture.
  6. Injecteur de carburant selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'élément de soupape de commande (28) est guidé avec sa périphérie intérieure contre une goupille de pression (42) qui est formée en tant que composant séparé d'un composant présentant le siège de soupape de commande (35).
  7. Injecteur de carburant selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le diamètre de guidage intérieur de l'élément de soupape de commande (28) en forme de douille correspond au moins approximativement au diamètre (DI) de l'arête d'étanchéité (54).
  8. Injecteur de carburant selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'élément de soupape de commande (28) est guidé sur sa périphérie extérieure (43).
  9. Injecteur de carburant selon la revendication 8,
    caractérisé en ce que
    le guide pour le guidage de l'élément de soupape de commande (28) est réalisé sur un composant présentant le siège de soupape de commande (35).
  10. Injecteur de carburant selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    dans l'élément de soupape de commande (28) en forme de douille est prévu un alésage étagé (40) dont la portion tournée vers le siège de soupape de commande (35) est formée par un conduit intérieur (52) qui est connecté hydrauliquement de manière durable à un conduit de sortie (25) hors d'une chambre de commande (22), et qui débouche dans une portion (41) de l'alésage étagé (40) opposée au siège de soupape de commande (35), qui présente un diamètre intérieur plus grand que le conduit intérieur (52).
  11. Injecteur de carburant selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    des conduits axiaux (17) réalisés axialement entre un espace accumulateur de haute pression (6) et un espace de buse au niveau de la périphérie extérieure de l'élément de soupape d'injection (10) sont réalisés sous forme de conduit d'étranglement.
EP20090100198 2008-05-21 2009-03-23 Injecteur de carburant Expired - Fee Related EP2123898B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810001913 DE102008001913A1 (de) 2008-05-21 2008-05-21 Kraftstoff-Injektor

Publications (2)

Publication Number Publication Date
EP2123898A1 EP2123898A1 (fr) 2009-11-25
EP2123898B1 true EP2123898B1 (fr) 2011-09-28

Family

ID=41110777

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20090100198 Expired - Fee Related EP2123898B1 (fr) 2008-05-21 2009-03-23 Injecteur de carburant

Country Status (2)

Country Link
EP (1) EP2123898B1 (fr)
DE (1) DE102008001913A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011078346A1 (de) * 2011-06-29 2013-01-03 Robert Bosch Gmbh Schaltventil, Verfahren zum Herstellen eines Schaltventils und Kraftstoffinjektor mit einem Schaltventil
DE102014220345A1 (de) * 2014-10-08 2016-04-14 Robert Bosch Gmbh Kraftstoffeinspritzventil
CN111502880A (zh) * 2020-03-17 2020-08-07 成都威特电喷有限责任公司 一种防止动态泄漏的电控高压燃油喷射装置
CN113464337B (zh) * 2021-06-16 2023-05-30 中船动力研究院有限公司 船用柴油机共轨喷油器

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3446432B2 (ja) 1995-12-05 2003-09-16 株式会社デンソー 燃料噴射装置
GB9526522D0 (en) * 1995-12-23 1996-02-28 Lucas Ind Plc Valve arrangement
DE102004024215A1 (de) * 2004-05-15 2005-12-08 L'orange Gmbh Steuerventil
DE102004061800A1 (de) * 2004-12-22 2006-07-06 Robert Bosch Gmbh Injektor eines Kraftstoffeinspritzsystems einer Brennkraftmaschine
DE102007044355A1 (de) * 2007-06-21 2008-12-24 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor sowie Kraftstoffinjektor

Also Published As

Publication number Publication date
DE102008001913A1 (de) 2009-11-26
EP2123898A1 (fr) 2009-11-25

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