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EP2156045B1 - Injecteur - Google Patents

Injecteur Download PDF

Info

Publication number
EP2156045B1
EP2156045B1 EP08736615A EP08736615A EP2156045B1 EP 2156045 B1 EP2156045 B1 EP 2156045B1 EP 08736615 A EP08736615 A EP 08736615A EP 08736615 A EP08736615 A EP 08736615A EP 2156045 B1 EP2156045 B1 EP 2156045B1
Authority
EP
European Patent Office
Prior art keywords
valve
guide element
valve piece
injector
sleeve
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.)
Not-in-force
Application number
EP08736615A
Other languages
German (de)
English (en)
Other versions
EP2156045A1 (fr
Inventor
Bernd Streicher
Ralf Nussbaumer
Rudolf Heinz
Michael Mennicken
Holger Rapp
Wolfgang Stoecklein
Christian Faltin
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 EP2156045A1 publication Critical patent/EP2156045A1/fr
Application granted granted Critical
Publication of EP2156045B1 publication Critical patent/EP2156045B1/fr
Not-in-force 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • 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

  • the invention relates to an injector for injecting fuel in a combustion chamber of an internal combustion engine, in particular a common rail injector, according to the preamble of claim 1.
  • Such an injector is from the EP 0 740 068 A2 known.
  • Such an injector has the advantage that the valve sleeve is guided with its outer diameter axially displaceable in a guide element, which is designed as a separate component from the valve member, but is adjacent to this.
  • the guide element can be set only after the manufacture of the valve seat for the valve sleeve on the valve piece, whereby the valve seat can be produced in the usual manner.
  • Additional further advantages are the relatively simple manufacturability of the guide element and in a relatively high strength of the valve piece.
  • the invention has the object, an injector according to the preamble of claim 1 such that a further simplification of the manufacturing process is made possible.
  • This object is achieved in an injector with the features of claim 1.
  • the guide element is fixed to the valve piece by means of a press fit.
  • This embodiment comes along.
  • This type of attachment is particularly suitable for a sleeve-shaped (tubular) formed guide element, which is pressed in the axial direction on the valve piece. It is advantageous if the guide element is elastically deformable in the radial direction, at least in the region of the press fit, in order to improve the clamping effect.
  • the guide element is fixed to a, in particular slightly conical portion of the valve piece.
  • the cone angle of a corresponding inner cone of the guide element before its attachment to the conical portion in particular slightly smaller than the cone angle of the conical portion of the valve piece.
  • the press fit as a so-called Morsekegelpassung, as it is known, for example, for the determination of tools on shafts, formed.
  • the cone angle (angle between the axis of symmetry of the conical portion and the oblique lateral surface of the conical portion) of the conical portion of the valve piece is small, in particular very small, preferably the cone angle is less than about 10 °, in particular less than about 5 ° , Particularly preferably, the cone angle of the conical section is in a range between about 0.5 ° and about 2.5 °.
  • the angle (angle between the axis of symmetry of the inner cone and the oblique inner lateral surface of the inner cone) of the inner cone of the guide element is advantageously about 0.1 ° to about 1.5 °, preferably about 0.25 ° to about 0.75 ° smaller than the cone angle of the conical section of the valve piece.
  • valve seat is arranged on the valve piece directly adjacent to the conical portion of the valve piece on which the guide element is fixed.
  • the valve seat is formed as a convex conical seat, wherein the angle of the conical surface is substantially flatter than the angle of the conical portion for fixing the valve piece.
  • the guide element rests with a continuous contact surface on the valve piece, in particular on the conical portion of the valve piece.
  • the contact surface in particular annularly interrupted, preferably by an exemption, so a non-contacting area on the guide element and / or on the valve piece.
  • two, in particular annular, in the axial direction by the clearance spaced contact areas between the guide member and the valve piece are formed, whereby the clamping action can be improved.
  • an outflow channel has to be provided from the fuel volume within the valve sleeve.
  • the transverse bore does not necessarily extend orthogonally to the longitudinal center axis of the valve sleeve, but may also be arranged obliquely.
  • valve sleeve on its outer circumference and / or the guide element on its inner periphery with at least one mecanicnanschliff to form an axial outflow channel.
  • Fig. 1 is a highly schematic section of a trained as a common rail injector injector 1 for injecting fuel in a combustion chamber, not shown, of an internal combustion engine shown.
  • Fig. 1 is intended to explain only the operation of the injector, wherein the proportions shown do not correspond to the real size ratios.
  • the injector 1 comprises a single-part or multi-part valve element 2 which is shown only in sections and which is adjustable between an open position and a closed position. In its open position (adjusted upward in the plane of the drawing), the valve element 2 releases the fuel flow from a pressure chamber 3 through a nozzle hole arrangement, not shown, into the combustion chamber of an internal combustion engine.
  • valve element 2 delimits a control chamber 5.
  • the latter is arranged radially inside a sleeve-shaped section of a valve piece 6 projecting into the pressure space 3.
  • control chamber 5 opens a introduced into the sleeve-shaped portion of the valve piece 6 inlet throttle 7, via which the control chamber 5 is supplied with fuel from the pressure chamber 3.
  • the pressure chamber 3 is in turn supplied by a fuel supply line 8 under high pressure fuel from a high-pressure fuel storage 9 (Rail).
  • This is powered by a, in particular designed as a radial piston pump high-pressure pump 10 with fuel from a low-pressure reservoir 11.
  • a radial piston pump high-pressure pump 10 with fuel from a low-pressure reservoir 11.
  • valve piece 6 From the control chamber 5 opens an inserted in the axial direction in the valve piece 6 drain channel 14. This is provided with an outlet throttle 15, or designed as such.
  • the drainage channel 14 spreads in his in the plane of the drawing upper portion and terminates in a valve chamber 16 which is bounded radially outwardly by the valve piece 6 and by a valve sleeve 17 adjacent thereto in the axial direction of a control valve 18 (servo valve).
  • the valve chamber 16 of the control valve 18 In the axial upward direction, the valve chamber 16 of the control valve 18 is delimited by an axially displaceably mounted pressure pin 19, which is pressed by befindlichem within the valve chamber 16 fuel in the axial direction in the plane up against a drain pipe 36.
  • the pressure pin 19 passes through a bore 37 in a holding body 20 of an electromagnet assembly 21.
  • a closing spring 23 which is formed on an integrally formed with the valve sleeve 17 anchor plate 24 is supported, is spring-loaded against the outlet nozzle 36.
  • the closing spring 23 acts simultaneously on the armature plate 24 and thus the valve sleeve with a spring force in the axial direction in the plane down to a formed on the valve piece 6, formed as a conical seat valve seat 25 of the control valve 18.
  • the closing spring is supported on an annular shoulder of the holding body 20th the solenoid assembly 21 from.
  • control valve 18 is a servo-pressure-balanced in the axial direction servo valve.
  • a hollow cylindrical, sleeve-shaped guide member 26th intended to guide the valve sleeve 17 on its outer periphery.
  • the guide member 26 is fixed by means of a press fit to a conical portion 27 of the valve piece 6, wherein an outer cone angle ⁇ of the conical portion 27 is shown for reasons of illustration much larger than this is preferably formed in reality.
  • the cone angle ⁇ between a conical surface 28 and an axis parallel to the longitudinal central axis L of the control valve 18 in this embodiment is about 1 °.
  • the conical portion 27 facing away from end face 29 of the guide member 26 is arranged at an axial distance to the underside of the anchor plate 24. How out Fig. 1 can be seen, the valve seat 25 is disposed radially within the conical portion 27 and the conical surface 28 (conical surface).
  • the guide element 26 is fixed by means of a press fit to the conical portion 27 of the valve piece 26.
  • a cone angle ⁇ of an inner cone 30 is like the cone angle ⁇ of the conical portion 27 of the valve member 6 in the mounted state also 1 °. Before assembly, however, the cone angle ⁇ of the inner cone 30 is slightly smaller than the cone angle ⁇ .
  • the inner cone is expanded elastically outward in the radial direction in order to improve the clamping effect.
  • the illustrated non-positive connection between the guide member 26 and the conical portion 27 of the valve member 6 is a kind Morsekegelpassung.
  • the guide member 26 has two opposite arranged at the level of the valve seat 25, slightly inclined transverse bores 31, 32 introduced by the fuel from the valve chamber 16 at the valve seat 25 lifted valve sleeve 17 of the control valve 18 in the guide member 26 surrounding the low pressure region 12 of the Injector can flow. From the low-pressure region 12, the fuel can flow through the injector return 13 to the reservoir 11.
  • valve sleeve 17 from the in Fig. 1 shown displaced position by energizing the solenoid assembly 21 in the plane of the drawing so that fuel via the introduced into the conical section 27, central drain passage 14 into the valve chamber 16 and from there below the valve sleeve in the radial direction and through the transverse bores 31, 32nd through into the low-pressure region 12 and from there to the injector return 13 can flow.
  • transverse bores 31, 32 themselves can be formed as discharge throttles.
  • FIG. 2 illustrated embodiment of an injector 1 substantially corresponds to the embodiment according to Fig. 1 so that to avoid repetition in the following, only the differences will be discussed. With regard to the similarities, reference is made to the preceding description of the figures.

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)
  • Fuel-Injection Apparatus (AREA)
  • Glass Compositions (AREA)
  • Disintegrating Or Milling (AREA)
  • Jellies, Jams, And Syrups (AREA)

Claims (9)

  1. Injecteur pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne, en particulier injecteur à rampe commune, comprenant une soupape de commande (18) présentant un manchon de soupape (17) guidé sur sa périphérie extérieure et déplaçable axialement, au moyen de laquelle soupape de commande le flux de carburant traversant un canal d'écoulement (14) monté dans une pièce de soupape (6) dans la direction de la région basse pression (12) de l'injecteur (1) hors d'une sonde de commande (5) connectée fonctionnellement à un élément de soupape (2) réglable axialement peut être libéré et bloqué, un siège de soupape (25) du manchon de soupape (17) étant formé sur la pièce de soupape (6), le manchon de soupape (17) étant guidé sur sa périphérie extérieure par un élément de guidage (26) qui est réalisé sous forme de composants séparés de la pièce de soupape (6) et l'élément de guidage (26) s'appliquant contre la pièce de soupape (6), caractérisé en ce que l'élément de guidage (26) est réalisé sous forme de manchon notamment cylindrique dont le diamètre intérieur correspond au diamètre extérieur du manchon de soupape (17) en tenant compte d'un jeu de guidage.
  2. Injecteur selon la revendication 1, caractérisé en ce que
    l'élément de guidage (26) est fixé au moyen d'un ajustement serré sur la pièce de soupape (6).
  3. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément de guidage (26) est fixé sur une portion conique (27) de la pièce de soupape (6).
  4. Injecteur selon la revendication 3, caractérisé en ce
    qu'un angle de conicité (β) d'un cône interne (30) de l'élément de guidage (26) est inférieur, en particulier légèrement, à l'angle de conicité (α) de la portion conique (27) de la pièce de soupape.
  5. Injecteur selon l'une quelconque des revendications 3 ou 4, caractérisé en ce que
    la portion conique (27) de la pièce de soupape (6) présente un angle de conicité (α) compris dans une plage entre environ 0,5° et environ 10°, de préférence inférieur à 7°, de préférence inférieur à 5°, notamment inférieur à 3°, particulièrement préférablement inférieur à 2° et tout préférablement d'environ 1°.
  6. Injecteur selon l'une quelconque des revendications 3 à 5, caractérisé en ce
    qu'un siège de soupape (25) du manchon de soupape (17) est guidé radialement à l'intérieur de la portion conique (27).
  7. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce que
    l'élément de guidage (26) s'applique dans la région de contact avec la pièce de soupape (6) à plat contre celle-ci.
  8. Injecteur selon l'une quelconque des revendications 1 à 6, caractérisé en ce que
    dans la région de contact entre l'élément de guidage (26) et la pièce de soupape (6) est prévue une partie creusée (33), notamment annulaire, sur l'élément de guidage (26) et/ou sur la pièce de soupape (6).
  9. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce
    qu'un alésage transversal (31, 32) destiné à évacuer le carburant hors du canal d'écoulement (14) dans la région basse pression (12) est monté dans l'élément de guidage (26).
EP08736615A 2007-05-14 2008-04-29 Injecteur Not-in-force EP2156045B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007022586A DE102007022586A1 (de) 2007-05-14 2007-05-14 Injektor
PCT/EP2008/055206 WO2008138743A1 (fr) 2007-05-14 2008-04-29 Injecteur

Publications (2)

Publication Number Publication Date
EP2156045A1 EP2156045A1 (fr) 2010-02-24
EP2156045B1 true EP2156045B1 (fr) 2010-11-24

Family

ID=39811713

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08736615A Not-in-force EP2156045B1 (fr) 2007-05-14 2008-04-29 Injecteur

Country Status (6)

Country Link
EP (1) EP2156045B1 (fr)
CN (1) CN101680405B (fr)
AT (1) ATE489551T1 (fr)
DE (2) DE102007022586A1 (fr)
RU (1) RU2469206C2 (fr)
WO (1) WO2008138743A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007044361A1 (de) 2007-09-17 2009-03-19 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor
DE102007044356A1 (de) * 2007-09-17 2009-03-19 Robert Bosch Gmbh Injektor
DE102007044362A1 (de) 2007-09-17 2009-03-19 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor
DE102014226258A1 (de) * 2014-12-17 2016-06-23 Robert Bosch Gmbh Kraftstoffinjektor
CN114146742B (zh) * 2021-12-23 2024-12-24 安图实验仪器(郑州)有限公司 高精度多柱塞联排移液装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD122574A1 (fr) * 1975-10-24 1976-10-12 Karl Marx Stadt Automobilbau
FR2580728B1 (fr) * 1985-04-19 1989-05-05 Alsacienne Constr Meca Systeme d'injection de combustible pour moteur diesel
JPH0286953A (ja) * 1988-09-21 1990-03-27 Kanesaka Gijutsu Kenkyusho:Kk 燃料噴射弁
US5191867A (en) * 1991-10-11 1993-03-09 Caterpillar Inc. Hydraulically-actuated electronically-controlled unit injector fuel system having variable control of actuating fluid pressure
GB9508623D0 (en) 1995-04-28 1995-06-14 Lucas Ind Plc "Fuel injection nozzle"
DE19650900A1 (de) * 1996-12-07 1998-06-10 Bosch Gmbh Robert Piezoelektrischer Aktuator
IT1289794B1 (it) * 1996-12-23 1998-10-16 Elasis Sistema Ricerca Fiat Perfezionamenti ad una valvola di dosaggio a comando elettromagnetico per un iniettore di combustibile.
EP1612403B1 (fr) 2004-06-30 2007-01-10 C.R.F. Società Consortile per Azioni Soupape servo pour controller l'injecteur d'un moteur à combustion interne
DE102006055548A1 (de) * 2006-11-24 2008-05-29 Robert Bosch Gmbh Kraftstoffinjektor

Also Published As

Publication number Publication date
RU2469206C2 (ru) 2012-12-10
CN101680405A (zh) 2010-03-24
DE102007022586A1 (de) 2008-11-27
EP2156045A1 (fr) 2010-02-24
RU2009146123A (ru) 2011-06-20
WO2008138743A1 (fr) 2008-11-20
DE502008001904D1 (de) 2011-01-05
ATE489551T1 (de) 2010-12-15
CN101680405B (zh) 2012-03-21

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