EP2195522B1 - Injecteur avec un élément de soupape de commande en forme de manchon - Google Patents

Injecteur avec un élément de soupape de commande en forme de manchon Download PDF

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Publication number
EP2195522B1
EP2195522B1 EP08804280.9A EP08804280A EP2195522B1 EP 2195522 B1 EP2195522 B1 EP 2195522B1 EP 08804280 A EP08804280 A EP 08804280A EP 2195522 B1 EP2195522 B1 EP 2195522B1
Authority
EP
European Patent Office
Prior art keywords
injector
valve sleeve
valve
chamber
control valve
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
EP08804280.9A
Other languages
German (de)
English (en)
Other versions
EP2195522A1 (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 EP2195522A1 publication Critical patent/EP2195522A1/fr
Application granted granted Critical
Publication of EP2195522B1 publication Critical patent/EP2195522B1/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
    • F02M63/0014—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
    • F02M63/007—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
    • 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

Definitions

  • the invention relates to an injector for injecting fuel into a combustion chamber of an internal combustion engine, in particular a common rail injector, according to the preamble of claim 1.
  • the EP 1 612 403 A1 is a common rail injector with a pressure balanced in the axial direction control valve known.
  • the control valve which has a sleeve-shaped control valve element, the fuel pressure can be influenced within a control chamber bounded on the end side by an injection valve element.
  • the injection valve element is adjusted between an open position and a closed position, wherein the injection valve element releases the fuel flow into the combustion chamber of an internal combustion engine in its open position.
  • the sleeve-shaped control valve element is connected to an anchor plate, which cooperates with an electromagnetic actuator for adjusting the sleeve-shaped control valve element.
  • the invention is therefore based on the object to propose an improved injector in which caused by the fuel flowing in the direction of the injector return port with open control valve, acting on the armature plate and thus the switching behavior of the injector negatively influencing flow forces are at least reduced.
  • the invention is based on the idea of acting on the anchor plate flow forces of when open Control valve (servo-valve) in the direction of the Injektor Wegnnenan gleiches flowing fuel to minimize or preferably completely avoid that the fuel, at least one fuel partial flow, with open control valve through a channel within the valve sleeve in the axial direction in the direction of the injector return port.
  • the fuel thus flows within the valve sleeve, possibly additionally inside the armature plate on the armature plate in the axial direction radially inward past without flow forces that could affect the switching behavior of the injector, act on the armature plate.
  • the fuel flowing out of the control chamber with the control valve open does not have to flow in the axial direction through or along the large (valve) seat facing the control valve seat by providing the channel within the valve sleeve, but flows centrally in the direction of the injector return.
  • An injector designed according to the concept of the invention with a channel arranged inside the valve sleeve (control valve element) of the control valve has an optimized switching behavior, since valve sleeve vibrations caused by the fuel flowing out of the control chamber in the direction of the injector return connection are avoided in known injectors.
  • the optimized switching behavior is characterized in particular by minimized injection tolerances.
  • the valve sleeve of the control valve is operatively connected to a formed according to the concept of the invention injector with the valve sleeve, that is, either integrally formed with this or, in particular form-fitting, connected thereto.
  • control valve when this rests against its control valve seat, is pressure balanced in the axial direction.
  • sealing edge is arranged on the inner circumference of the valve sleeve, so that a pressure step on the valve sleeve, which would cause an opening force on the valve sleeve, is avoided.
  • the channel extends to the end remote from the control valve seat end of the valve sleeve, the fuel so the front side of the valve sleeve or possibly the front side of the valve sleeve surrounding or axially adjacent to this arranged armature plate flows out.
  • the channel in the armature space preferably above the anchor plate
  • the channel is extended in such a way that it does not open directly into the armature space but into a central duct arranged above the armature space in an electromagnet arrangement of the actuator.
  • the task of the separate pressure pin is to absorb the compressive forces acting in the axial direction, support and thereby seal the inner cross-section of the valve sleeve high-pressure tight in the axial direction, so that when the control valve is closed, ie at the control valve seat fitting valve sleeve, no fuel from the control chamber Injector return can flow.
  • the pressure pin integral with the Injector component is formed, on which also the control valve seat is located.
  • the channel is formed within the valve sleeve as an annular channel which is radially outwardly of the inner circumference of the valve sleeve and radially inwardly of the, preferably centrally disposed within the valve sleeve, pressure pin is limited.
  • the pressure pin has a thickened (lower) end portion which serves as a high pressure seal for sealing the inner cross section of the valve sleeve in the axial direction (up).
  • a thickened end portion of the channel does not extend, but begins in an axial direction seen adjacent to the thickened end portion adjacent, thin portion of the pressure pin, which preferably extends in the axial direction to a spaced from the control valve member member and at this is supported in the axial direction or formed integrally therewith.
  • the diameter of the thickened end portion is at least approximately the inner diameter of the valve sleeve.
  • the thinned portion has a smaller diameter than the thickened end portion, which is dimensioned such that on the one hand results in a channel of sufficient cross-section for the derivation of the fuel tax and on the other strength problems are avoided.
  • the pressure pin can be formed both one-piece and multi-part.
  • At least one axial passage leading to the injector return is provided in the component on which the pressure pin is supported in the axial direction.
  • the component on which the pressure pin is supported is preferably located within a central channel arranged in an electromagnet arrangement, which leads directly to the injector return.
  • the control valve seat is surrounded by an annular space in the fuel with open control valve can flow from within the valve sleeve in the radial direction, said annular space is hydraulically connected to the disposed within the valve sleeve channel.
  • the hydraulic connection between the annular space and the channel disposed within the valve sleeve is designed as at least one bore, preferably as at least one radial bore, which leads from the annular space in the disposed within the valve sleeve channel for discharging the fuel.
  • annular space is limited in the axial direction and possibly also in the radial direction of a component which is designed as a guide member for guiding the valve sleeve on its outer periphery.
  • This guide component is preferably designed as a separate component from the component having the control valve seat, so that the guide for the axially adjustable valve sleeve and the control valve seat can be made separately from each other and are easily accessible.
  • an embodiment is advantageous in which to ensure a low flow through the armature space fuel (partial flow of fuel control amount) via a throttle from the annulus in the armature space and from there to the injector return flow.
  • the injector can be dispensed with such a throttle, especially if the unavoidable leakage between the valve sleeve and the outer guide is sufficiently large to ensure a venting of the armature space.
  • FIG. 1 a trained as a common rail injector injector with a disposed within a valve sleeve of a control valve channel (annular channel).
  • Fig. 1 a designed as a common rail injector injector 1 for injecting fuel into a combustion chamber of an internal combustion engine of a motor vehicle is shown.
  • a high pressure pump 2 delivers fuel from a reservoir 3 in a high-pressure fuel storage 4 (Rail).
  • fuel especially diesel or gasoline, under high pressure, of about 2000 bar in this embodiment.
  • the injector 1 is connected via other, not shown, injectors via a supply line 5.
  • the supply line 5 opens into a pressure chamber 6 (high pressure area) of the injector 1 and flows from there in an injection process directly into the combustion chamber of the internal combustion engine.
  • the injector 1 is connected via an injector return port 7 to a return line 8 to the reservoir 3. Via the return line 8, a later to be explained control amount of fuel from the injector 1 to flow to the reservoir 3 and are fed back from there from the high pressure circuit.
  • an injector body 9 Within an injector body 9 is a one-piece injection valve element 10 in this embodiment, which may also be designed in several parts, if necessary, adjustable in the axial direction.
  • the injection valve element 10 is guided within a nozzle body 11 at its outer periphery. This nozzle body 11 is clamped by means of a union nut, not shown, with the injector 9.
  • the injection valve element 10 has at its tip 12 a closing surface 13 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 control chamber 22 is limited, via a radially extending in the sleeve-shaped portion 20 of the plate member 21 inlet throttle 23 with high-pressure fuel from the pressure chamber 6 is supplied.
  • the sleeve-shaped portion 20 with enclosed therein control chamber 22 is radially outwardly surrounded by fuel under high pressure, so that an annular guide gap 24 radially between the sleeve-shaped portion 20 and the injection valve member 10 is comparatively fuel-tight.
  • the control chamber 22 is connected via a arranged in the plate member 21 drain passage 25 with outlet throttle 26 with a valve chamber 27, the radially outward of a, adjustable in the axial direction, valve sleeve 28 of a pressure-balanced in the axial direction of the control valve 29 (servo valve ) is limited. From this fuel can flow into a low-pressure region 30 of the injector 1 and from there to the injector return port 7 when the valve sleeve 28, which is fixedly connected to an anchor plate 31, lifted from its formed on the plate member 21 control valve seat 35, that is, the control valve 29th is open.
  • an electromagnetic actuator 32 For adjusting the valve sleeve 28 in the drawing plane up an electromagnetic actuator 32 is provided with electromagnets 33, which cooperates with the armature plate 31 which is arranged in an armature space 34 and in the sequence with the valve sleeve 28.
  • the actuator 32nd When energized the actuator 32nd lifts the valve sleeve 28 from its arranged on the plate member 21, formed in this embodiment as a flat seat 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 the control valve 29 is open, a net outflow of fuel (fuel control quantity) from the control chamber 22 via the valve chamber 27 into the low-pressure region 30 of the injector 1 and from there via the injector return port 7 and the return line 8 flows into the reservoir 3.
  • the pressure in the control chamber 22 drops rapidly, whereby the injection valve element 10 lifts off from its injection valve element seat 14, so that fuel can flow out of the pressure chamber 6 through the nozzle hole arrangement 15.
  • the energization of the electromagnetic actuator 32 is interrupted, whereby the valve sleeve 28 is adjusted by means of a control spring 36 which is supported on the armature plate 31 in the drawing plane down to its control valve seat 35.
  • a control spring 36 which is supported on the armature plate 31 in the drawing plane down to its control valve seat 35.
  • Fuel flowing in through the inlet throttle 23 into the control chamber 22 ensures rapid pressure increase in the control chamber 22 and thus a closing force acting on the injection valve element 10.
  • the resulting closing movement of the injection valve element 10 is supported by a closing spring 37, which is supported at one end on a peripheral collar 38 of the injection valve element 10 and the other end on the lower side in the drawing plane end face 39 of the sleeve-shaped portion 20 of the plate member 21.
  • Valve sleeve 28 designed as an annular channel channel 40 which passes through the armature plate 34 radially inside and opens in an upper plane in the drawing plane above the anchor plate 31 in the armature space 34 and from there directly through a central channel 41 within an electromagnet assembly 42 of the electromagnetic actuator 32 in the axial direction to the centrically arranged on the end face 43 of the injector 1 Injektor Wegnnenan gleich 7 can flow without having to flow along the large anchor surfaces of the armature plate 31.
  • central channel 41 which is bounded radially on the outside of the solenoid assembly 42, and the control spring 36 is arranged, which is supported in the axial direction of a plate member 44 with axial channels 45 through which fuel to the return line 8 can flow.
  • a pressure pin 46 which seals the valve chamber 27 in the axial direction with an upper in the plane of the lower thickened end portion 47.
  • the pressure forces acting on the thickened end section 47 are supported by the pressure pin 46 on the plate element 44 and thus on a front-side cover 54 of the injector 1.
  • the pressure pin 46 is formed thickened only in its lower end portion 47. In the axial direction of this is followed by a thin portion 48, which extends up to the plate member 44. This thin portion 48 of the pressure pin 46 defines radially inside the channel 40, which is bounded radially outwardly by the valve sleeve 28 and the anchor plate 31.
  • the fuel When the control valve 29 is open, the fuel initially flows into an annular space 49, which surrounds a lower portion of the valve sleeve 28 radially on the outside.
  • This annular space 49 in turn is bounded radially outwardly and in the axial direction upward by a component 50 which guides the valve sleeve 28 on its outer circumference below the anchor plate 31.
  • the fuel flows through a bore 51, which is designed as a radial bore in the valve sleeve 28 in the channel 40 in the plane above the thickened end portion 47 of the pressure pin 46 and flows from there in the axial direction further into the central channel 41st via the Injektor Weglaufan gleich 7 in the return line 8.
  • the component 50, which defines the annular space 49 is braced in the axial direction between the plate member 21 and a screw plate 52 which is held within the injector body 9 by screwing.

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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 pour l'injection de carburant dans la chambre de combustion d'un moteur à combustion interne, en particulier injecteur à rampe commune, comprenant un élément de soupape d'injection (10) qui peut être déplacé dans la direction axiale en fonction de la pression dans une chambre de commande (22) entre une position de fermeture et une position d'ouverture, la chambre de commande (22) pouvant être connectée à un raccord de retour d'injecteur (7) au moyen d'une soupape de commande (29) présentant une douille de soupape réglable (28), et la douille de soupape (28) étant en liaison fonctionnelle avec une plaque d'induit (31) qui coopère avec un actionneur électromagnétique (31) pour le réglage de la douille de soupape (28), un canal (40) s'étendant dans la direction axiale étant prévu à l'intérieur de la douille de soupape (28), à travers lequel du carburant peut s'écouler devant la plaque d'induit (31) depuis la chambre de commande (22) vers le raccord de retour d'injecteur (7) à l'intérieur lorsque la soupape de commande est ouverte (29), caractérisé en ce que radialement à l'intérieur de la douille de soupape (28) est disposée une goupille de pression (46) qui est réalisée sous forme de composant séparé d'un élément de plaque (21) présentant un siège de soupape de commande (35).
  2. Injecteur selon la revendication 1, caractérisé en ce que la soupape de commande (29), dans l'état fermé, est réalisée sous forme de soupape à équilibrage de la pression dans la direction axiale.
  3. Injecteur selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que le raccord de retour d'injecteur (7) est disposé centralement au niveau d'un côté frontal (43) de l'injecteur (1).
  4. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce que le canal (40) débouche dans un espace d'induit (34) recevant la plaque d'induit (31) ou dans un canal central (41) disposé en position adjacente à l'espace d'induit (34) dans un agencement d'électroaimant (42) de l'actionneur (32).
  5. Injecteur selon la revendication 1, caractérisé en ce que le canal (40) est réalisé sous forme de canal annulaire disposé radialement entre la douille de soupape (28) et la goupille de pression (46).
  6. Injecteur selon l'une quelconque des revendications 1 ou 5, caractérisé en ce que la goupille de pression (46) présente une portion d'extrémité épaissie (47) qui ferme la douille de soupape (28) à l'intérieur dans la direction axiale de manière étanche aux pressions élevées, et en ce qu'une portion mince (48) se raccorde à la portion d'extrémité épaissie (47) dans la direction axiale, laquelle délimite radialement à l'intérieur le canal (40).
  7. Injecteur selon l'une quelconque des revendications 1, 5 ou 6, caractérisé en ce que la goupille de pression (46) s'appuie dans la direction axiale contre un élément de plaque (44) muni d'au moins un canal axial (45), disposé dans la direction d'écoulement du carburant avant le raccord de retour d'injecteur (7).
  8. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce que la douille de soupape (28), dans une portion inférieure tournée vers le siège de soupape de commande (35), est entourée radialement à l'extérieur par un espace annulaire (49) dans lequel le carburant peut sortir d'une région à l'intérieur de la douille de soupape (28) lorsque la soupape de commande (29) est ouverte, et en ce que l'espace annulaire (49) est connecté hydrauliquement au canal (40).
  9. Injecteur selon la revendication 8, caractérisé en ce que l'espace annulaire (49) est connecté au canal (40) par le biais d'un alésage (51) dans la douille de soupape (28), notamment réalisé sous forme d'alésage radial.
  10. Injecteur selon l'une quelconque des revendications 8 ou 9, caractérisé en ce que l'espace annulaire (49) est limité par un composant (50) guidant la douille de soupape (28) au niveau de sa périphérie extérieure.
  11. Injecteur selon l'une quelconque des revendications 8 à 10, caractérisé en ce que l'espace annulaire (49) est connecté hydrauliquement par le biais d'un étranglement (53) directement à un espace d'induit (34) dans lequel est disposée la plaque d'induit (31) en liaison fonctionnelle avec la douille de soupape (28).
EP08804280.9A 2007-10-02 2008-09-16 Injecteur avec un élément de soupape de commande en forme de manchon Not-in-force EP2195522B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710047129 DE102007047129A1 (de) 2007-10-02 2007-10-02 Injektor mit hülsenförmigem Steuerventilelement
PCT/EP2008/062323 WO2009047091A1 (fr) 2007-10-02 2008-09-16 Injecteur avec élément soupape de commande en forme de douille

Publications (2)

Publication Number Publication Date
EP2195522A1 EP2195522A1 (fr) 2010-06-16
EP2195522B1 true EP2195522B1 (fr) 2015-11-11

Family

ID=40154093

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08804280.9A Not-in-force EP2195522B1 (fr) 2007-10-02 2008-09-16 Injecteur avec un élément de soupape de commande en forme de manchon

Country Status (3)

Country Link
EP (1) EP2195522B1 (fr)
DE (1) DE102007047129A1 (fr)
WO (1) WO2009047091A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009027841A1 (de) * 2009-07-20 2011-01-27 Robert Bosch Gmbh Kraftstoffeinspritzventil
DE102015202726A1 (de) * 2015-02-16 2016-08-18 Robert Bosch Gmbh Steuerventilanordnung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005090422A (ja) * 2003-09-19 2005-04-07 Bosch Automotive Systems Corp 燃料噴射弁
ES2277229T3 (es) 2004-06-30 2007-07-01 C.R.F. Societa Consortile Per Azioni Servovalvula para controlar el inyector de combustible de un motor de combustion interna.
EP1731752B1 (fr) * 2005-05-27 2010-01-20 C.R.F. Società Consortile per Azioni Soupape asservie de contrôle de carburant et injecteur de carburant avec une telle soupape
DE102006015745A1 (de) * 2006-04-04 2007-10-11 Robert Bosch Gmbh Kraftstoffinjektor mit direktgesteuertem Einspritzventilglied
DE102006055487A1 (de) * 2006-11-24 2008-05-29 Robert Bosch Gmbh Kraftstoffinjektor
DE102006055548A1 (de) * 2006-11-24 2008-05-29 Robert Bosch Gmbh Kraftstoffinjektor
DE102007001554A1 (de) * 2007-01-10 2008-07-17 Robert Bosch Gmbh Kraftstoffinjektor

Also Published As

Publication number Publication date
WO2009047091A1 (fr) 2009-04-16
DE102007047129A1 (de) 2009-04-09
EP2195522A1 (fr) 2010-06-16

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