EP2499352A1 - Injecteur de carburant - Google Patents

Injecteur de carburant

Info

Publication number
EP2499352A1
EP2499352A1 EP10762649A EP10762649A EP2499352A1 EP 2499352 A1 EP2499352 A1 EP 2499352A1 EP 10762649 A EP10762649 A EP 10762649A EP 10762649 A EP10762649 A EP 10762649A EP 2499352 A1 EP2499352 A1 EP 2499352A1
Authority
EP
European Patent Office
Prior art keywords
valve
guide
valve element
valve seat
axial
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
EP10762649A
Other languages
German (de)
English (en)
Other versions
EP2499352B1 (fr
Inventor
Nadja Eisenmenger
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 EP2499352A1 publication Critical patent/EP2499352A1/fr
Application granted granted Critical
Publication of EP2499352B1 publication Critical patent/EP2499352B1/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
    • 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
    • F02M63/0077—Valve seat details
    • 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
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • 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
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • 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
    • F02M63/0071—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059 characterised by guiding or centering means in valves including the absence of any guiding means, e.g. "flying arrangements"
    • 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

  • Hub-controlled fuel injectors are known with designed as a solenoid valve or piezoelectric valve control valve for controlling the pressure in a limited by an axially adjustable injection valve element control chamber.
  • the newest control valves are designed to be pressure-balanced, that is to say such that in the closed state in the axial direction the forces that are as small as possible, or preferably no forces at all, act in the axial direction.
  • the use of pressure compensated control valves allows smaller spring forces, small actuator forces, smaller control valve strokes and thus faster switching times. Due to the faster switching times, the multiple injection capability can be significantly improved.
  • the invention has the object of a fuel! specify injector with a control valve, in which the best possible sealing of the valve seat of the control valve is provided on the valve seat and at the same time a comparatively inexpensive guide for the valve element can be realized.
  • the invention is based on the consideration that, in practice, it can be assumed that transverse forces act on the valve element of the control valve during operation of the fuel injector, which causes the valve element to touch the guide at any point at any time.
  • two extreme positions are conceivable, namely, on the one hand, a fully tilted position, in which the valve element rests on an upper annular edge of the guide and the other on the opposite side to a lower annular edge of the guide and a second extreme position, wherein the valve element within the guide is completely shifted in parallel and on an axially extending line the guide is present.
  • the invention further proceeds from the assumption that the lateral forces acting on the valve element, in particular the transverse forces of a valve spring acting on the valve element, act in such a way that the first alternative (first extreme position or position) is more likely, namely that the valve element is more full tilted lying in the guide and it will be based on the one hand at the top of the guide and the other on the opposite side at the bottom of the guide.
  • control valve for the first extreme position ie the fully tilted valve element is to be optimized, preferably such that the valve element on the valve seat does not even have to slip to cooperate sealingly with the valve seat, but already in the fully tilted Position (first extreme position) seals.
  • the invention achieves this by realizing the guide for the valve element and the geometric configuration and arrangement of the valve seat such that a fictitious pivot point of the valve seat is located within the axial extent of the guide. This is intended to ensure that this fictitious, later to be explained pivot point of the valve seat and the pivot point of the valve tilelementes, which is arranged on the axial center of the guide, as close as possible.
  • the object is also achieved with a second alternative, this differs from the first alternative only in that here the imaginary circle touches the sealing element formed on the valve element punctually in two spaced points (preferably does not cut the sealing area) and that the center of this Circle is a fictitious, imaginary pivot point of the sealing region of the valve element.
  • the sealing area and the guide are fixed relative to each other, which can be realized by the fact that the sealing area and the guide are formed by the valve element.
  • the assumption is that the imaginary circle is the turning circle on which the valve element is tilted in the closed state, i. moved when the sealing area on the valve seat. It is particularly preferred if the sealing region is formed in the second alternative as an inner or outer cone and in the longitudinal sectional view of the fuel injector two spaced, line-shaped sealing area surface sections each form a tangent to the imaginary circle.
  • the center of the imaginary, the valve seat at two spaced points each selectively touching and preferably the seat non-cutting circle, ie the fictitious pivot point of the valve seat as close to the axial center, ie the pivot point of the valve element in the first Extreme situation (plant at the upper Guide edge and system on the opposite lower guide edge) is arranged.
  • the distance between the center of the circle and the axial center of the guide less than 40% of the axial guide length, in particular less than 30%, preferably less than 20%, more preferably less than 10%, most preferably less than 5 %.
  • the second alternative for the imaginary circle which contacts the sealing region at two points and which preferably does not intersect the sealing surface.
  • the center of the imaginary circle (in the first or second alternative) is arranged on a longitudinal central axis of the guide.
  • valve seat or the sealing region of the valve element in a cone shape.
  • internal or external conical seats can be realized as an alternative, with the valve element interacting with inner cone-shaped surfaces in the case of the inner cone-shaped valve seat or sealing area and with outer conical valve seat surfaces or sealing area surfaces.
  • valve seat or the sealing area as an outer or inner cone
  • the imaginary circle two angularly mutually extending valve seat surface portions or Dicht Schemes vomabitese so selectively touched that the latter each form a tangent to the imaginary circle, ie in each case orthogonal to Radius run.
  • Each cone has an inner cone side and an outer cone side, with inner cone-shaped valve seats or sealing regions with their inner cone side sealingly cooperating with the valve element and outer cone valve seats or outer cone sealing areas with their outer cone side. It is particularly expedient if the axial guide for the valve element is arranged on the inner cone side of the valve seat or sealing area, irrespective of whether the valve seat or sealing area is an outer cone or an inner cone.
  • FIG. 2 shows an alternative embodiment of a control valve with a bolt-shaped valve element and a valve chamber arranged on the outer circumference
  • FIG. 3 shows a further alternative exemplary embodiment of a control valve with a bolt-shaped valve element which has an annular groove-like depression on the outer circumference which encloses the valve chamber connected to the control chamber forms, wherein the valve seat is designed as an outer cone and
  • Fig. 4 shows another alternative embodiment of a control valve in which the valve member is sleeve-shaped and the imaginary circle touches a innenkonusförmigen sealing region of the valve element punctually and wherein the valve seat is disposed on an axial, projecting into the valve element extension of a throttle plate and with a valve element cooperates with a trained leadership.
  • a high-pressure fuel storage 4 (Rail).
  • this fuel especially diesel, under high pressure, of about 2000bar 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 opens into a pressure chamber 6.
  • a return line 7 is a low pressure region 8 of the fuel! Njektors 1 connected to the reservoir 3. Via the return line 8, a later to be explained control amount of fuel from the fuel injector 1 to the reservoir 3 to flow.
  • a one-part or multi-part injection valve element 9 is arranged axially adjustable.
  • the injection valve element 9 has at a tip, not shown, a closing surface with which the injection valve element 9 can be brought into tight contact with an injection valve element seat which is formed inside a nozzle body (not shown).
  • Nozzle hole arrangement flow into the combustion chamber of the internal combustion engine.
  • a control chamber 13 (servo chamber) is limited, via an introduced in the sleeve 12 inlet throttle 14 under high pressure fuel from the pressure chamber 6 is supplied.
  • the control chamber 10 is connected via a drain passage 15 with outlet throttle 16 (drain passage 15 and outlet throttle 16 is located within the throttle plate 1 1) with a valve chamber 17, the radially outward of a sleeve-shaped valve element 18 (control valve element) of a
  • Control valve 19 is limited.
  • the control valve 19 is a sectional view shown in the left half of the drawing and in the right half of the drawing only the dimensioning of a later still to be explained guide for the valve element 18th
  • valve chamber 17 From the valve chamber 17 can fuel in the low pressure region 8 of the fuel! Inject injector when the actuator actuated by an electromagnetic actuator valve member 18 of its designed as an inner cone and arranged on the throttle plate 1 1 valve seat 20 (control valve seat) lifted, ie the control valve 19 is opened.
  • the flow cross sections of the inlet 14 and the outlet throttle 15 are matched to one another such that when the control valve 19 is open, a net outflow of fuel (control quantity) from the control chamber 13 via the valve chamber 17 into the low-pressure region 8 of the fuel! njektors 1 and from there via the return line 7 into the reservoir 3 results.
  • the control valve 19 is formed in the embodiment shown as a pressure-balanced valve in the axial direction in the closed state, wherein the valve member 18 is integrally connected in its upper portion with an anchor plate, not shown, which cooperates with an electromagnetic actuator, not shown.
  • the actuator When the actuator is energized, the sleeve-shaped valve element 18 lifts from its internally conical valve seat 20, as a result of which the pressure within the control chamber 13 drops rapidly and the injection valve element 9 moves upward in the axial direction in the plane of the drawing into the sleeve 12, whereby the injection valve element 9 lifts from its injection valve seat and fuel can flow into the combustion chamber.
  • a bolt 22 which has the task of sealing the valve chamber 17 in the axial direction upwards.
  • the diameter of the bolt 22 corresponds at least approximately to the diameter of the annular sealing line, with which the valve element 18 cooperates with the inner cone-shaped valve seat 20.
  • the valve element 18 is at its outer periphery in an annularly confluent guide bore 23, the guide 24 for the valve element 18 forms, guided.
  • the guide 24 has the axial length L.
  • An imaginary circle 26 is arranged in the shown, the longitudinal central axis L receiving longitudinal sectional plane such that it touches the valve seat 20 in two radially spaced points P- ⁇ and P 2 punctually, wherein the circle 26, the valve seat 20 does not intersect.
  • Two spaced-apart, a mecanickonuswinkel ß enclosing valve seat surface sections 27, 28 each form a tangent to the circle 26, so that the radius r s of the circle 26 at the points P- ⁇ and P 2 at right angles to the valve seat 20, more precisely on the valve seat surface sections 27th , 28, stands.
  • valve element 18 is not sleeve-shaped, but designed as a bolt, which is guided in a guide 23 with the axial extension I.
  • valve seat surface sections 27, 28 form tangents on the circle 26. It can be seen that the center of the circle is located within the axial extension L of the guide 23 at L / 2, on the longitudinal center axis L of the valve element 18.
  • the valve chamber 17 is incorporated into the outer circumference of the valve element 18 in the manner of an annular groove and when the control valve 19 is open fuel can not as in Fig. 2 in the
  • valve chamber 17 is located on the outer circumference of the extension 34 as an inner annular groove within the sleeve-shaped

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)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un injecteur de carburant pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne, en particulier un injecteur à rampe commune, comprenant une soupape de commande (19) pour la liaison hydraulique d'une chambre de commande (13) en liaison active avec un élément de soupape d'injection (9) d'un seul tenant ou en plusieurs parties avec une zone de basse pression (8), la soupape de commande (19) comprenant un élément de soupape (18) réglable axialement au moyen d'un actionneur, coopérant dans sa position de fermeture avec un siège de soupape (20), élément auquel est attribué un guidage axial (24) pour le guidage de l'élément de soupape (18) lors de son déplacement de réglage axial. Selon l'invention, il est prévu qu'un centre (M) d'un cercle imaginaire (26) est disposé à l'intérieur de la longueur de guidage axiale du guide (24), et que le cercle touche ponctuellement le siège de soupape (20) ou la zone d'étanchéité (31), coopérant avec le siège de soupape (20), de l'élément de soupape (18) en deux points espacés (P1, P2) dans un plan de coupe longitudinal, recevant un axe médian longitudinal (L) de l'élément de soupape (18) de la soupape de commande (19), de l'injecteur de carburant (1), et que le centre (M) du cercle imaginaire (26) est espacé de moins de 40 %, de préférence de moins de 30 %, avec une préférence de moins de 20 %, et avec une préférence particulière de moins de 20 %, de la longueur de guidage axiale du guide (24) par rapport à un milieu axial (25) du guide (24).
EP10762649.1A 2009-11-10 2010-10-01 Injecteur de carburant Active EP2499352B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009046563A DE102009046563A1 (de) 2009-11-10 2009-11-10 Kraftstoffinjektor
PCT/EP2010/064655 WO2011057864A1 (fr) 2009-11-10 2010-10-01 Injecteur de carburant

Publications (2)

Publication Number Publication Date
EP2499352A1 true EP2499352A1 (fr) 2012-09-19
EP2499352B1 EP2499352B1 (fr) 2013-07-03

Family

ID=43127213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10762649.1A Active EP2499352B1 (fr) 2009-11-10 2010-10-01 Injecteur de carburant

Country Status (7)

Country Link
US (1) US20120216772A1 (fr)
EP (1) EP2499352B1 (fr)
CN (1) CN102597488B (fr)
DE (1) DE102009046563A1 (fr)
IN (1) IN2012DN02007A (fr)
RU (1) RU2572028C2 (fr)
WO (1) WO2011057864A1 (fr)

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DE102012211283A1 (de) * 2012-06-29 2014-01-02 Robert Bosch Gmbh Leckage- und schlupfreduziertes Ventil
DE102016217508A1 (de) 2016-09-14 2018-03-15 Robert Bosch Gmbh Kraftstoffinjektor
JP6866243B2 (ja) * 2017-06-22 2021-04-28 ボッシュ株式会社 燃料噴射装置

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Also Published As

Publication number Publication date
CN102597488A (zh) 2012-07-18
DE102009046563A1 (de) 2011-05-12
RU2012123964A (ru) 2013-12-20
CN102597488B (zh) 2016-03-30
EP2499352B1 (fr) 2013-07-03
US20120216772A1 (en) 2012-08-30
WO2011057864A1 (fr) 2011-05-19
RU2572028C2 (ru) 2015-12-27
IN2012DN02007A (fr) 2015-07-24

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