EP2111505B1 - Injecteur de carburant avec surpresseur intégré - Google Patents

Injecteur de carburant avec surpresseur intégré Download PDF

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Publication number
EP2111505B1
EP2111505B1 EP08701208A EP08701208A EP2111505B1 EP 2111505 B1 EP2111505 B1 EP 2111505B1 EP 08701208 A EP08701208 A EP 08701208A EP 08701208 A EP08701208 A EP 08701208A EP 2111505 B1 EP2111505 B1 EP 2111505B1
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EP
European Patent Office
Prior art keywords
pressure
fuel injector
chamber
control valve
return
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.)
Active
Application number
EP08701208A
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German (de)
English (en)
Other versions
EP2111505A1 (fr
Inventor
Juergen Frasch
Heinz-Bernd Haiser
Christoph Butscher
Hans-Christoph Magel
Stephan Wehr
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2111505A1 publication Critical patent/EP2111505A1/fr
Application granted granted Critical
Publication of EP2111505B1 publication Critical patent/EP2111505B1/fr
Active legal-status Critical Current
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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
    • 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
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from injectors
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors

Definitions

  • the invention is based on a fuel injector according to the preamble of claim 1.
  • a fuel injector with an integrated pressure booster is for example out DE 103 35 340 A1 known.
  • the pressure intensifier has a pressure booster piston guided in a housing of the fuel injector, which acts on a compression space, a differential pressure space and a high-pressure space.
  • a first control valve With a first control valve, a rear control chamber of a nozzle needle is controlled and derived the control volume in a low pressure / return system.
  • a second control valve also connects the differential pressure chamber of the booster to the low pressure / return system.
  • the pressure booster piston presses into the compression space and compresses the fuel, which thereby receives an increase in pressure, which is transmitted to a pressure shoulder of the nozzle needle, so that acting on the pressure shoulder translated high pressure lifts the nozzle needle from the nozzle needle seat and the fuel with the injected via the system pressure increased fuel pressure in the combustion chamber of an internal combustion engine.
  • an injection valve which has two control valves and a leakage connection on the outside, over which the leakage amount is derived.
  • a fuel injection system which has an injector with laterally formed leakage port for the leakage amount.
  • the object of the invention is achieved with the characterizing features of claim 1.
  • the fuel injector according to the invention has the advantage that a mutual function influencing the control valves is prevented. This ensures a stable quantity map of the fuel injector, which is necessary in order to ensure an optimal course of injection as a function of the power requirement to the internal combustion engine.
  • the arrangement of the two return ports in different housing parts of the housing a simple separation and design of the two return ports is possible.
  • the first return connection for the control quantity or for the control volume of the control chamber of the nozzle needle by at least one bore, which is guided through a first housing part to the outside, wherein the housing part is the nozzle retaining nut, and the second return port for the To realize control amount or for the control volume of the pressure booster by at least one further bore, which is guided by a second housing part to the outside.
  • the second bore opens into a formed on the outer wall of the housing part annular recess, wherein the recess of a first Housing portion and a second housing portion is limited, and wherein in each case a sealing ring is arranged in the first housing portion and the second housing portion.
  • the first control valve has a first low-pressure space, which is connected via a hydraulic connecting line with a first space which lies between the nozzle retaining nut and a further housing part.
  • the second control valve has a second low-pressure space, which is hydraulically connected to at least one drain hole, which leads into a second space into which the further bore of the second return port opens.
  • the second control valve is associated with a leakage chamber, which is hydraulically connected via guided through the housing hydraulic connecting lines to the first low-pressure chamber of the first control valve.
  • the leakage space is hydraulically connected to the second low-pressure chamber of the second control valve by means of a bypass channel in which a throttle is integrated.
  • each of the two return ports When installed in the internal combustion engine, each of the two return ports is connected to one integrated in a cylinder head of the internal combustion engine return passage, each return passage is connected to a respective low pressure / return system of the internal combustion engine.
  • a stepped bore is expediently formed in the cylinder head into which the housing of the fuel injector at least partially protruding, wherein within the stepped bore two hydraulically separated sections are provided with respective annular spaces, and wherein in the one annular space of the first return port and in the other annulus of the second return section opens and the annular spaces, each with a return channel are hydraulically connected.
  • the in FIG. 1 dargish fuel injector includes, for example, a housing 10 having a first housing part 11, a second housing part 12, a third housing part 13, a fourth housing part 14 and a connecting part 15 and a nozzle body 16.
  • the nozzle body 16, the housing part 14 and the housing part 13 are clamped hydraulically tight by means of a nozzle lock nut 17.
  • the nozzle body 16 includes an injection valve member 20 having a nozzle needle 21 which is guided axially displaceably in the nozzle body 16.
  • the nozzle needle 21 cooperates with a nozzle needle seat not shown in more detail, which is formed on the nozzle body 16, which forms a sealing seat with the nozzle needle 21, which in turn separates a nozzle needle pressure chamber 22 from the injection openings 23 in the closed state of the nozzle needle 21.
  • a control chamber sleeve 24 is guided, which presses by means of a compression spring 25 against a sealing surface and thereby encloses a control chamber 26.
  • the control chamber 26 is exposed to the nozzle needle 21 with a control surface 27 acting in the closing direction.
  • a high-pressure bore 18 is arranged, which leads into the nozzle needle pressure chamber 22.
  • the housing 10 has, for example on the housing part 12, a high-pressure connection 19 with a high-pressure feed line 29, with which the fuel injector is connected to a common rail of a diesel injection device.
  • a designed as a stepped piston pressure booster piston 31 for pressure amplification of the system pressure of the common rail is exposed to a working space 32, a differential pressure chamber 33 and a compression space 34.
  • the working space 32 and the compression space 34 are connected via a connecting channel 35 with a check valve 36 in connection.
  • the high-pressure feed line 29 in the working space 32
  • the pressure booster piston 31 in the in FIG. 1 resets the initial position shown.
  • the piston portion 37 serves as a stop when returning the pressure booster piston 31 to the starting position.
  • From the compression space 34 branches off a further high-pressure bore 39, which is hydraulically connected to the high-pressure bore 18, so that the pressure of the compression space 34 is transmitted to the nozzle needle pressure chamber 22.
  • the fuel injector further comprises a first control valve 40 designed as a servo valve and a second control valve 50 likewise designed as a servo valve.
  • the first control valve 40 is a 2/2 way valve and comprises a first electromagnetic control element 41 with a magnet armature 42 is connected to a first valve piston 43.
  • the valve piston 43 acts on a sealing seat 44 which separates a control bore 45 connected to the control chamber 26 from a low-pressure chamber 46.
  • a guided out of the low pressure chamber 46 of the first control valve 40 first low-pressure connection 461 leads into a housing part 14 surrounding the first annular space 48 into which a guided through the nozzle retaining nut 17 bore 49 leads.
  • the bore 49 forms a first return port 71, which is hydraulically in communication with a first low pressure / return system.
  • the control amount of the control chamber 26 of the nozzle needle 21, which is switched by the first control valve 40, is discharged into the first low pressure / return system, wherein the control quantity flows into the low pressure / return system at a substantially constant pressure level of only approximately 1 bar.
  • the second control valve 50 includes a second electromagnetic actuator 52 having a second armature 53 connected to a second valve piston 54.
  • the valve piston 54 has, for example, a first sealing seat 55 designed as a slide seat and a second sealing seat 56 designed, for example, as a flat seat, so that the second control valve 50 functions as a 3/2-way valve.
  • the first sealing seat 55 separates a high pressure line 57 connected to the working space 32 from a valve space 58.
  • the valve space 58 is connected to the differential pressure chamber 33 via a hydraulic connection 59 and is connected by means of the second sealing seat 56 hydraulically separated from another low-pressure space 61.
  • two drainage holes 62 lead to a branching space 63, which is connected via further hydraulic connections 64 to a further annular space 65.
  • two bores 66 which are guided through the housing part 13 branch off from the annular space 65 and form a second return port 72.
  • the second return port 72 communicates with a second low pressure / return system.
  • Above the bore 66 is an upper annular housing portion 75 and below the bore 66, a lower annular housing portion 76, each with a sealing ring 77 is arranged. Between the housing sections 75, 76 thus forming a running around the housing 10 recess 78 into which open the two holes 66.
  • the control amount of the pressure boosting device 30 connected by the second control valve 50 is discharged into the second low pressure / return system.
  • the control amount of the pressure booster 30 is greater than the control amount of the control chamber 26 and has much higher pressure surges.
  • the low-pressure chamber 46 of the first control valve 40 is formed via the first low-pressure connection 461 formed in the housing part 14, a second low-pressure connection 462 guided through the housing part 13, a third low-pressure connection 463 guided through the housing part 12 and a fourth low-pressure connection 464 formed in the housing part 11 with a leakage space 51 the second control valve 50 is hydraulically connected.
  • the leakage chamber 51 expands in the second control element 52 to the second valve piston 53.
  • a bypass channel 67 is arranged with a throttle 68, so that the two hydraulic chambers are connected hydraulically throttled.
  • FIG. 2 shows the fuel injector in the installed state in a cylinder head 80 of an internal combustion engine.
  • the cylinder head 80 has a stepped bore 81 with a first section 82, a second section 83 and a third section 84 and with an annular bearing surface 85.
  • On the annular bearing surface 85 is a sealing ring 86, on which the fuel injector rests with the nozzle retaining nut 17.
  • the stepped bore 81 has a first annular space 87 into which the second return port 72 opens.
  • the first annular space 87 is hydraulically sealed upwards and downwards by means of the sealing rings 77.
  • a second annular space 88 is formed, which is hydraulically sealed upwardly by the sealing ring 77 of the second housing portion 76 and down through the sealing ring 86.
  • the first return port 71 opens.
  • the first return passage 91 is connected to the first low pressure / return system.
  • a second return passage 92 leads into the first annular space 87, so that by means of the second return passage 92 further unillustrated second return ports of further fuel injectors are hydraulically coupled.
  • the second return passage 92 is hydraulically connected to the second low pressure / return system.
  • the fuel injector is fixed by means of a clamping claw 95, which acts on a flange-shaped annular surface 96 on the housing 10 of the fuel injector by means of a clamping screw 97 on the cylinder head 80, such that by means of the clamping claw 95 and the sealing ring 86 on the support surface 85, a gas-tight support of the fuel injector arises towards the combustion chamber of the internal combustion engine.

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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 (10)

  1. Injecteur de carburant pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne, comprenant un boîtier (10), dans lequel sont disposés un organe de soupape d'injection (20) avec une aiguille de buse (21) pour ouvrir et fermer au moins une ouverture d'injection (23), un dispositif amplificateur de pression (30), avec lequel du carburant à la pression du système est comprimé à la pression d'injection, ainsi qu'une première soupape de commande (40) et une deuxième soupape de commande (50), la première soupape de commande (40) commandant un espace de commande (26) de l'aiguille de buse (21) et la deuxième soupape de commande (50) commandant un espace de pression différentiel (33) du dispositif amplificateur de pression (30), un raccord haute pression (19) étant prévu pour l'alimentation en carburant et un premier raccord de retour (71) pour l'évacuation d'une quantité de commande d'un espace de commande (26) de l'aiguille de buse (21) et un deuxième raccord de retour (72) pour l'évacuation d'une quantité de commande du dispositif amplificateur de pression (30) étant prévus, et les deux raccords de retour (71, 72) étant disposés sur des parties différentes du boîtier (10), caractérisé en ce qu'un espace de fuite (51) est associé à la deuxième soupape de commande (50), lequel est connecté hydrauliquement au premier espace basse pression (46) de la première soupape de commande (40) par le biais de conduites de liaison hydrauliques (461, 462, 463, 464) guidées à travers le boîtier (10).
  2. Injecteur de carburant selon la revendication 1, caractérisé en ce que le premier raccord de retour (71) pour la quantité de commande de l'aiguille de buse (21) est réalisé par au moins un alésage (49), qui est guidé vers l'extérieur par une partie de boîtier disposée à proximité de l'aiguille de buse (21).
  3. Injecteur de carburant selon la revendication 2, caractérisé en ce que la partie de boîtier disposée à proximité de l'aiguille de buse est un écrou de serrage de buse (17).
  4. Injecteur de carburant selon la revendication 1, caractérisé en ce que le deuxième raccord de retour (72) pour la quantité de commande du dispositif amplificateur de pression (30) est réalisé par au moins un alésage supplémentaire (66), qui est guidé vers l'extérieur par une deuxième partie de boîtier (13).
  5. Injecteur de carburant selon la revendication 4, caractérisé en ce que l'alésage supplémentaire (66) débouche dans un renfoncement (78) de forme annulaire réalisé sur la paroi extérieure de la partie de boîtier (13), en ce que le renfoncement (78) est limité par une première portion de boîtier (75) et une deuxième portion de boîtier (76), et en ce que dans la première portion de boîtier (75) et dans la deuxième portion de boîtier (76) est à chaque fois disposée une bague d'étanchéité (77).
  6. Injecteur de carburant selon la revendication 1, caractérisé en ce que la première soupape de commande (40) présente un premier espace basse pression (46), qui est connecté par le biais d'une conduite de liaison hydraulique (461) à un premier espace (48), et en ce que dans le premier espace (48) débouche l'alésage (49) du premier raccord de retour (71).
  7. Injecteur de carburant selon la revendication 1, caractérisé en ce que la deuxième soupape de commande (50) présente un deuxième espace basse pression (61), qui est connecté hydrauliquement à au moins un alésage d'écoulement (62) qui conduit dans un deuxième espace (65), dans lequel débouche l'alésage supplémentaire (66) du deuxième raccord de retour (72).
  8. Injecteur de carburant selon la revendication 1, caractérisé en ce que l'espace de fuite (51) est connecté hydrauliquement au moyen d'un canal de dérivation (67), dans lequel est intégré un étranglement (68), au deuxième espace basse pression (61) de la deuxième soupape de commande (50).
  9. Injecteur de carburant selon l'une quelconque des revendications précédentes, caractérisé en ce que chacun des deux raccords de retour (71, 72) est à chaque fois connecté à un canal de retour (91, 92) intégré dans une culasse de cylindre (80) du moteur à combustion interne, et en ce que chaque canal de retour (91, 92) est raccordé à chaque fois à un système de retour basse pression du moteur à combustion interne.
  10. Injecteur de carburant selon la revendication 9, caractérisé en ce qu'un alésage étagé (81) est réalisé dans la culasse de cylindre (80), dans lequel pénètre au moins en partie le boîtier (10), en ce qu'à l'intérieur de l'alésage étagé (81) sont réalisées au moins deux portions séparées hydrauliquement (82, 83), en ce que dans l'une des portions (83) débouche le premier raccord de retour (71) et dans l'autre portion (82) débouche le deuxième raccord de retour (72), et en ce que les portions (82, 83) sont connectées à chaque fois à l'un des canaux de retour (91, 92).
EP08701208A 2007-01-18 2008-01-03 Injecteur de carburant avec surpresseur intégré Active EP2111505B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007002760A DE102007002760A1 (de) 2007-01-18 2007-01-18 Kraftstoffinjektor mit integriertem Druckverstärker
PCT/EP2008/050022 WO2008087052A1 (fr) 2007-01-18 2008-01-03 Injecteur de carburant avec surpresseur intégré

Publications (2)

Publication Number Publication Date
EP2111505A1 EP2111505A1 (fr) 2009-10-28
EP2111505B1 true EP2111505B1 (fr) 2012-03-14

Family

ID=39263058

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08701208A Active EP2111505B1 (fr) 2007-01-18 2008-01-03 Injecteur de carburant avec surpresseur intégré

Country Status (8)

Country Link
US (1) US8348176B2 (fr)
EP (1) EP2111505B1 (fr)
JP (1) JP5108897B2 (fr)
CN (1) CN101583791B (fr)
AT (1) ATE549506T1 (fr)
DE (1) DE102007002760A1 (fr)
ES (1) ES2379841T3 (fr)
WO (1) WO2008087052A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006034112A1 (de) * 2006-07-24 2008-01-31 Robert Bosch Gmbh Kraftstoffinjektor
DE102009026567A1 (de) 2009-05-29 2010-12-02 Robert Bosch Gmbh Kraftstoffinjektor mit Druckverstärkerkolben
US9133801B2 (en) * 2011-11-01 2015-09-15 Cummins Inc. Fuel injector with injection control valve spring preload adjustment device
RU2543926C1 (ru) * 2014-04-28 2015-03-10 Федеральное государственное унитарное предприятие "Центральный ордена Трудового Красного Знамени научно-исследовательский автомобильный и автомоторный институт "НАМИ" Устройство для подачи топлива к форсунке дизельного двигателя
US11136953B2 (en) * 2018-11-20 2021-10-05 Delphi Technologies Ip Limited Fuel injector with a locating pin, internal combustion engine using the same, and method
CN109869251A (zh) * 2019-02-28 2019-06-11 一汽解放汽车有限公司 一种液力耦合喷油器
EP4421302A1 (fr) * 2023-02-21 2024-08-28 WinGD AG Moteur diesel à double carburant et son procédé de fonctionnement

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JPS59126067A (ja) * 1983-01-06 1984-07-20 Yanmar Diesel Engine Co Ltd 内燃機関のシリンダヘツド
US6257499B1 (en) * 1994-06-06 2001-07-10 Oded E. Sturman High speed fuel injector
US6161770A (en) * 1994-06-06 2000-12-19 Sturman; Oded E. Hydraulically driven springless fuel injector
SE510090C2 (sv) 1996-10-11 1999-04-19 Volvo Lastvagnar Ab Långsträckt cylinderhuvud med kaviteter för insprutningsenheter och bränsletillförselanordningar
DE19910970A1 (de) * 1999-03-12 2000-09-28 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung
DE10001828A1 (de) * 2000-01-18 2001-07-19 Fev Motorentech Gmbh Direktgesteuerte Kraftstoffeinspritzeinrichtung für eine Kolbenbrennkraftmaschine
DE10002273A1 (de) * 2000-01-20 2001-08-02 Bosch Gmbh Robert Einspritzeinrichtung und Verfahren zum Einspritzen von Fluid
DE10155413A1 (de) * 2001-11-10 2003-05-22 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten
US7219655B2 (en) 2003-02-28 2007-05-22 Caterpillar Inc Fuel injection system including two common rails for injecting fuel at two independently controlled pressures
DE10335340A1 (de) 2003-08-01 2005-02-24 Robert Bosch Gmbh Steuerventil für einen Druckübersetzer enthaltenden Kraftstoffinjektor
ATE463670T1 (de) * 2004-01-14 2010-04-15 Bosch Corp Kraftstoffzufuhrpumpe
JP4196870B2 (ja) * 2004-03-31 2008-12-17 三菱ふそうトラック・バス株式会社 燃料噴射装置
DE102004017305A1 (de) * 2004-04-08 2005-10-27 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen mit direkt ansteuerbaren Düsennadeln
DE102004053421A1 (de) 2004-11-05 2006-05-11 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung
DE102006038840A1 (de) 2006-08-18 2008-02-21 Robert Bosch Gmbh Kraftstoffinjektor mit Kolbenrückholung eines Druckübersetzerkolbens

Also Published As

Publication number Publication date
JP2010516933A (ja) 2010-05-20
WO2008087052A1 (fr) 2008-07-24
US20100019068A1 (en) 2010-01-28
CN101583791A (zh) 2009-11-18
DE102007002760A1 (de) 2008-07-24
ES2379841T3 (es) 2012-05-04
US8348176B2 (en) 2013-01-08
CN101583791B (zh) 2013-11-06
ATE549506T1 (de) 2012-03-15
JP5108897B2 (ja) 2012-12-26
EP2111505A1 (fr) 2009-10-28

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