EP2150696B1 - Injecteur pour un système d'injection de carburant - Google Patents

Injecteur pour un système d'injection de carburant Download PDF

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Publication number
EP2150696B1
EP2150696B1 EP08759421A EP08759421A EP2150696B1 EP 2150696 B1 EP2150696 B1 EP 2150696B1 EP 08759421 A EP08759421 A EP 08759421A EP 08759421 A EP08759421 A EP 08759421A EP 2150696 B1 EP2150696 B1 EP 2150696B1
Authority
EP
European Patent Office
Prior art keywords
pressure
chamber
pressure booster
injector
needle
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
EP08759421A
Other languages
German (de)
English (en)
Other versions
EP2150696A1 (fr
Inventor
Markus Melzer
Joachim Boltz
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 EP2150696A1 publication Critical patent/EP2150696A1/fr
Application granted granted Critical
Publication of EP2150696B1 publication Critical patent/EP2150696B1/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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification

Definitions

  • the present invention relates to an injector for a fuel injection system of an internal combustion engine, in particular in a motor vehicle.
  • an increase in the injection pressure is the focus of further development.
  • a reduction of the hydraulic vibrations also has a favorable effect on the nozzle seat wear.
  • the increase in the injection pressure is usually achieved in known injectors in that a pressure boost is made, by means of which the fuel is pressurized with a pressure greater than the pressure of the system, ie with a multiple of the atmospheric pressure and injected with this high pressure in the combustion chamber becomes.
  • a supply line from the fuel to the pressure booster usually takes place via a plurality of interconnected holes, which, however, weaken the injector body, see document EP1416152 A1 and thereby affect the durability of the same and are also prone to leakage.
  • the injector according to the invention with the features of claim 1 has the advantage that no holes for a hydraulic connection of a pressure booster must be provided in the injector body and thereby the durability of the injector according to the invention can be increased.
  • the injector according to the invention has, as usual, a pressure booster section, also called actuator section, and a needle section, wherein in the latter hubver pla a nozzle needle for controlling an injection of fuel through at least one injection hole is arranged.
  • the pressure intensifier used to increase the fuel injection pressure has a stepped piston, a control rod and a pressure booster ground, which all together define a coupler space.
  • a coupling path extending in the control rod is provided in the injector according to the invention, which connects the coupler chamber via a valve device located outside the injector to a high-pressure fuel supply.
  • the core advantage is thus in the simple central connection of the fuel supply to the pressure booster. This makes it possible to realize a relatively high injection pressure while maintaining a moderate system pressure.
  • the injector according to the invention also has a significantly improved multiple injection capability due to its large Injektorhoch horrvolumens and lower pressure fluctuations due to lack of control lines.
  • a quick switching or actuation of the nozzle needle is possible. Due to the fact that consuming and the durability of the injector impairing and leakage-prone holes within the injector body can be omitted, the durability of the injector according to the invention is significantly improved.
  • the control rod expediently engages, with its end facing the nozzle needle, into a cavity embedded in the pressure intensifier bottom, which is hydraulically connected via a connecting path to a needle control chamber, which in turn is delimited by the nozzle needle, a surrounding nozzle needle sleeve and the pressure intensifier base.
  • the communication path axially penetrating the communication path which may be formed as a bore, for example, is centrally located compared to conventional, arranged in the injector bores and thereby significantly easier to manufacture or seal. In particular, eliminates in this solution, a hydraulic wiring in a Injektor redesignwand or outside the injector to the needle control chamber, which presents a structurally simple and mature solution.
  • the stepped piston is surrounded by a stroke sleeve which is adjustable in stroke or by a solid annular wall, wherein the stepped piston, the pressure intensifier bottom and the filling sleeve or the fixed annular wall together define a pressure booster chamber, usually also referred to as a booster chamber.
  • a biasing spring may additionally be provided which is supported at one end on an injector-side stop and the other end on the filling sleeve and biases the latter against the pressure intensifier base.
  • a translation effect is thereby effected by the prevailing between the coupler space and the booster chamber significant differences in size. This makes it possible to achieve a high injection pressure while maintaining a moderate system pressure, whereby the pollutant emission of the engine equipped with the injector according to the invention can be reduced.
  • a high-pressure chamber is arranged in the injector body, in which the control rod, the stepped piston and the filling sleeve or the annular wall are arranged.
  • the high pressure chamber is compared to the coupler space, booster chamber and needle control room significantly larger and has the largest volume.
  • a large-volume high-pressure chamber has a positive effect on pressure oscillations in multiple injections, which can be kept to a low level.
  • the high-pressure fuel supply via a hydraulic line directly to the high-pressure chamber and indirectly connected via the valve means to the coupling path in the control rod.
  • both the direct supply line to the high-pressure chamber and the indirect supply line via the valve device to the coupling path in the control rod at least partially parallel in a Injektorstimplatte, so that a connection of the injector according to the invention to the high-pressure fuel supply via only one side, namely the Injektorstirnplatte is possible.
  • structurally complicated wiring for example, the pressure booster room or the needle control room is not required.
  • an injector 1 according to the invention comprises an injector body 2, which is usually assembled from two sections, namely a needle section 3 arranged at the bottom and a pressure translator section 4 arranged above it.
  • the two sections 3 and 4 can be formed by a suitable connection technique, for example a welded connection or a Be connected to each other screw.
  • a union nut 5 is provided, which receives the needle section 3 and braced against the pressure booster section 4.
  • the union nut 5 is preferably screwed to the pressure booster section 4.
  • the injector 1 is fed by a high-pressure fuel supply 6 which is connected via a hydraulic line 7 directly to a high-pressure chamber 8 arranged in the injector 1 and indirectly via a hydraulic line 7 'having a valve device 9 to a coupling path 11 arranged in a control rod 10.
  • the nozzle needle 13 In the needle section 3 is at least one injection hole 12 and a stroke adjustable arranged nozzle needle 13 for controlling an injection of fuel through the at least one injection hole 12 is provided.
  • the nozzle needle 13 At its end facing away from the at least one spray hole 12, the nozzle needle 13 has a nozzle needle sleeve 14 surrounding it, which is supported by a closing compression spring 15, which is supported on the one hand on the nozzle needle sleeve 14 and on the other hand on the nozzle needle 13 or on a stop arranged there Pressure booster ground 16 is biased.
  • the closing compression spring 15 biases the nozzle needle 13 in its closed position.
  • the nozzle needle 13 is arranged adjustable in stroke in a nozzle chamber 28 which is hydraulically connected via at least one opening provided in the pressure booster 16 passage opening 29 with a pressure booster chamber 27.
  • a pressure booster 17 is arranged to increase a fuel injection pressure relative to a system pressure.
  • the pressure booster 17 has a stepped piston 18, the control rod 10 and the pressure booster base 16, which together define a coupler space 19.
  • the valve device 9 may be formed, for example, as a solenoid valve or piezoelectric actuator or as a 2/2 or 3/2-solenoid or piezo valve, which can represent a 3/2 functionality in combination with a servo valve.
  • the control rod 10 engages with its, the nozzle needle 13 facing the end in a, recessed in the pressure booster cavity 16 cavity 20, which is hydraulically connected via a connection path 21 with a needle control chamber 22.
  • the needle control chamber 22 is of the nozzle needle 13, the surrounding nozzle needle sleeve 14 and the Pressure booster bottom 16 limited.
  • the cavity 20 is connected to the coupler space 19 via the coupling path 11, the coupling path 11 having radial openings 23 in the region of the coupler space 19.
  • a control rod spring 24 may be provided which biases the control rod 10 in the direction of the cavity 20 out, here upwards.
  • a connecting line 30 is also provided, which is formed for example as a bore and which connects the pressure booster chamber 27 to the needle control chamber 22 hydraulically.
  • a throttle device 31 may be provided, for example, the throttle device 31 may be formed in the connection path 21 as a drain throttle and the throttle device 31 in the connecting line 30 as a Z-throttle.
  • the stepped piston 18 of the pressure booster 17 is according to the Fig. 1 to 3 surrounded by a stroke-adjustable on the stepped piston 18 filling sleeve 25.
  • the stepped piston 18 is surrounded by a fixed annular wall 26.
  • the annular wall 26 may be formed separately or integrally with the pressure intensifier base 16.
  • the stepped piston 18, the pressure intensifier base 17 and the filling sleeve 25 or the fixed annular wall 26 define a pressure amplifier rim 27.
  • a stepped piston spring 32 is provided, which is supported on the one hand on an injector-side stop 33 and on the other hand on the stepped piston 18.
  • the stepped piston spring 32 pushes the stepped piston spring 32 the stepped piston 18 upwards and thus biases this in a non-operating state against a stop 33 ', which is formed as an annular outer stage on the control rod 10.
  • the control rod 10 is pressed against an end plate 34, whereby the coupling path 11 is sealed against the high-pressure chamber 8.
  • At least one axial passage opening 35 is provided in the injector body-side stop 33, which hydraulically connects the high-pressure chamber 8 with its section 8 'situated below the stop 33.
  • a biasing spring 36 which biases the filling sleeve 25 against the pressure intensifier base 16.
  • the Biasing spring 36 is formed as a tension spring 37, which is supported at one end on the stepped piston 18 and the other end to the Be SchoHhütse 25 and biases the latter against pressure booster ground 16.
  • the stepped piston 18 is designed as a so-called “free-floating piston", which has no stroke stop on the control rod 10.
  • the control rod 10 as well as in the Fig. 3 and 4 clamped and sealed by the control rod spring 24 against the end plate 34.
  • the advantage here is that rapid pressure changes can be compensated directly by stroke changes of the stepped piston 18 and thereby can be ensured that the injector 1 does not unintentionally, especially at rapid system pressure drop opens.
  • a sealing edge of the nozzle needle sleeve 14 is compared to the embodiments of the injector 1 according to the Fig. 1 and 2 radially outside.
  • a sealing diameter of the nozzle needle sleeve 14 is thus on a larger diameter, whereby an opening is achieved when a pressure in the needle control chamber 22 is greater than in the nozzle chamber 28th
  • a stepped piston return by means of the stepped piston spring 32 is newly solved in order to realize a space advantage can. Therefore, the stepped piston spring 32 is supported via an annular collar 38 on the injector body 2 and presses on a disk 39 on the stepped piston 18 to reset this after completion of the injection process.
  • the mode of operation of the injector 1 according to the invention can be described as follows:
  • valve device 9 For closing the injector 1, the valve device 9 is actuated, in particular closed, whereby the pressures in the needle control chamber 22 and in the coupler chamber 19 rise again to system pressure.
  • the stepped piston spring 32 generates a slight negative pressure in the pressure booster chamber 27, whereby the Be Stirllhülse 25 opens and the provision of the stepped piston 18 in combination with a volume compensation leads to a provision of the injector 1 in its initial position.
  • a particular advantage of the injector 1 according to the invention is the central arrangement of the coupling path 11 within the control rod 10, whereby high-pressure bores in the injector 2 can be omitted.
  • a high injection pressure can be achieved with only a single valve device 9, while the system pressure is moderate.
  • a rapid switching of the nozzle needle 13 and a significantly improved multiple injection capability due to a large volume of the high-pressure chamber 8 and lower pressure fluctuations resulting in missing control lines can be achieved.

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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 (1) pour une installation d'injection de carburant d'un moteur à combustion interne, en particulier dans un véhicule automobile, comprenant
    - un corps d'injecteur (2) qui présente une portion de multiplication de la pression (4) et une portion d'aiguille (3), au moins un trou d'injection (12) étant prévu dans la portion d'aiguille (3),
    - une aiguille de buse (13) disposée avec une course réglable dans la portion d'aiguille (3) pour commander une injection de carburant à travers l'au moins un trou d'injection (12),
    - un multiplicateur de pression (17) pour augmenter une pression d'injection de carburant par rapport à une pression de système,
    - un chemin d'accouplement (11) s'étendant dans la tige de commande (10), lequel relie l'espace d'accouplement (19) par le biais d'un dispositif de soupape (9) placé à l'extérieur ou à l'intérieur de l'injecteur (1) avec une alimentation en carburant haute pression (6),
    caractérisé en ce que
    le multiplicateur de pression (17) présente un piston étagé (18), une tige de commande (10) et un fond de multiplication de pression (16), qui limitent ensemble un espace d'accouplement (19).
  2. Injecteur selon la revendication 1,
    caractérisé en ce que
    - la tige de commande (10) vient en prise avec son extrémité tournée vers l'aiguille de buse (13) dans une cavité (20) incorporée dans le fond de multiplication de pression (16),
    - la cavité (20) est connectée hydrauliquement à un espace de commande d'aiguille (22) par le biais d'un chemin de connexion (21), qui est limité par l'aiguille de buse (13), une douille d'aiguille de buse (14) entourant celle-ci et le fond de multiplication de pression (16).
  3. Injecteur selon la revendication 2,
    caractérisé en ce que
    la cavité (20) est connectée par le biais du chemin d'accouplement (11) à l'espace d'accouplement (19).
  4. Injecteur selon la revendication 2 ou 3,
    caractérisé en ce que
    l'on prévoit dans la cavité (20) un ressort de tige de commande (24) qui précontraint la tige de commande (10) dans la direction au-delà de la cavité (20).
  5. Injecteur selon l'une quelconque des revendications 2 à 4,
    caractérisé en ce que
    l'on prévoit un ressort de pression de fermeture (15) qui s'appuie d'une part contre la douille d'aiguille de buse (14) et d'autre part contre l'aiguille de buse (13) et qui précontraint la douille d'aiguille de buse (14) contre le fond de multiplication de pression (16) et l'aiguille de buse (13) dans sa position de fermeture.
  6. Injecteur selon l'une quelconque des revendications 1 à 5,
    caractérisé en ce que
    - le piston étagé (18) est entouré par une douille de remplissage (25) de course réglable contre celui-ci ou par une paroi annulaire fixe (26),
    - le piston étagé (18), le fond de multiplication de pression (16) et la douille de remplissage (25) ou la paroi annulaire fixe (26) délimitent un espace de multiplication de pression (27).
  7. Injecteur selon la revendication 6,
    caractérisé en ce que
    - l'aiguille de buse (13) est disposée avec une course réglable dans un espace de buse (28),
    - l'espace de buse (28) est connecté hydrauliquement par le biais d'au moins une ouverture de passage (29) prévue dans le fond de multiplication de pression (16) avec l'espace de multiplication de pression (27).
  8. Injecteur selon la revendication 5 ou 6,
    caractérisé en ce que
    - dans le fond de multiplication de pression (16) est prévue une conduite de liaison (30) qui relie l'espace de multiplication de pression (27) à l'espace de commande d'aiguille (22),
    - dans la conduite de liaison (30) entre l'espace de multiplication de pression (27) et l'espace de commande d'aiguille (22) et/ou dans le chemin de connexion (21) entre la cavité (20) et l'espace de commande d'aiguille (22) est prévu un dispositif d'étranglement (31).
  9. Injecteur selon l'une quelconque des revendications 6 à 8,
    caractérisé en ce que
    - l'on prévoit un ressort à piston étagé (32), qui s'appuie d'une part contre une butée (33) du côté du corps d'injecteur et d'autre part contre le piston étagé (18),
    - l'on prévoit un ressort de précontrainte (36) qui s'appuie à une extrémité contre la butée (33) et à l'autre extrémité contre la douille de remplissage (25) et précontraint cette dernière contre le fond de multiplication de pression (16) ou
    - l'on prévoit un ressort de serrage (37) qui s'appuie à une extrémité contre le piston étagé (18) et à l'autre extrémité contre la douille de remplissage (25) et qui précontraint cette dernière contre le fond de multiplication de pression (16).
  10. Injecteur selon la revendication 7 ou 8,
    caractérisé en ce que
    - la tige de commande (10) présente un étage extérieur de forme annulaire qui est réalisé sous forme de butée (33') pour le piston étagé (18), et/ou
    - le corps d'injecteur (2) contient un espace haute pression (8) dans lequel sont disposés la tige de commande (10), le piston étagé (18) et la douille de remplissage (25) ou la paroi annulaire.
  11. Injecteur selon la revendication 9,
    caractérisé en ce que
    l'alimentation en carburant haute pression (6) est connectée directement par le biais d'une conduite hydraulique (7) à l'espace haute pression (8) et indirectement par le biais du dispositif de soupape (9) au chemin d'accouplement (11) dans la tige de commande (10).
EP08759421A 2007-05-18 2008-05-06 Injecteur pour un système d'injection de carburant Not-in-force EP2150696B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007023384A DE102007023384A1 (de) 2007-05-18 2007-05-18 Injektor für eine Kraftstoffeinspritzanlage
PCT/EP2008/055522 WO2008141918A1 (fr) 2007-05-18 2008-05-06 Injecteur pour un système d'injection de carburant

Publications (2)

Publication Number Publication Date
EP2150696A1 EP2150696A1 (fr) 2010-02-10
EP2150696B1 true EP2150696B1 (fr) 2012-02-22

Family

ID=39588396

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08759421A Not-in-force EP2150696B1 (fr) 2007-05-18 2008-05-06 Injecteur pour un système d'injection de carburant

Country Status (5)

Country Link
US (1) US8418941B2 (fr)
EP (1) EP2150696B1 (fr)
AT (1) ATE546635T1 (fr)
DE (1) DE102007023384A1 (fr)
WO (1) WO2008141918A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008005532A1 (de) * 2008-01-22 2009-07-23 Robert Bosch Gmbh Kraftstoffinjektor, dessen Steuerventilelement einen Stützbereich aufweist
DE102009024596A1 (de) * 2009-06-10 2011-04-07 Continental Automotive Gmbh Einspritzventil mit Übertragungseinheit
DE102009024595A1 (de) 2009-06-10 2011-03-24 Continental Automotive Gmbh Einspritzventil mit Übertragungseinheit
DE102010001170A1 (de) * 2010-01-25 2011-07-28 Robert Bosch GmbH, 70469 Einspritzvorrichtung mit reduzierten Druckschwingungen
DE102012110240A1 (de) * 2012-10-26 2014-04-30 L'orange Gmbh Kraftstoff-Einspritz-Injektor für Brennkraftmaschinen
DE102013013234A1 (de) * 2013-08-08 2015-02-12 Man Diesel & Turbo Se Injektor für eine Kraftstoffversorgungsanlage einer Brennkraftmaschine sowie Kraftstoffversorgungsanlage

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3387790A (en) * 1967-04-11 1968-06-11 Bosch Arma Corp Fuel injection nozzle
US4367846A (en) * 1979-12-25 1983-01-11 Kawasaki Steel Corporation Fuel injection valve assembly for internal combustion engines
US4509691A (en) * 1982-07-15 1985-04-09 Lucas Industries Public Limited Company Fuel injection nozzles
JPS60192872A (ja) * 1984-03-15 1985-10-01 Nippon Denso Co Ltd 蓄圧式燃料噴射弁
US5713520A (en) * 1995-11-27 1998-02-03 Caterpillar Inc. Fast spill device for abruptly ending injection in a hydraulically actuated fuel injector
DE10247903A1 (de) * 2002-10-14 2004-04-22 Robert Bosch Gmbh Druckverstärkte Kraftstoffeinspritzeinrichtung mit innenliegender Steuerleitung
DE10250722A1 (de) * 2002-10-31 2004-05-13 Robert Bosch Gmbh Ventil zum Steuern von Flüssigkeiten mit einer Druckmittelzuführung

Also Published As

Publication number Publication date
DE102007023384A1 (de) 2008-11-20
ATE546635T1 (de) 2012-03-15
WO2008141918A1 (fr) 2008-11-27
EP2150696A1 (fr) 2010-02-10
US20100181392A1 (en) 2010-07-22
US8418941B2 (en) 2013-04-16

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