EP1831537B1 - Injecteur de systeme d'injection de carburant d'un moteur a combustion interne - Google Patents

Injecteur de systeme d'injection de carburant d'un moteur a combustion interne Download PDF

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Publication number
EP1831537B1
EP1831537B1 EP05808118A EP05808118A EP1831537B1 EP 1831537 B1 EP1831537 B1 EP 1831537B1 EP 05808118 A EP05808118 A EP 05808118A EP 05808118 A EP05808118 A EP 05808118A EP 1831537 B1 EP1831537 B1 EP 1831537B1
Authority
EP
European Patent Office
Prior art keywords
valve body
valve
stepped bore
injector
section
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
EP05808118A
Other languages
German (de)
English (en)
Other versions
EP1831537A1 (fr
Inventor
Rudolf Heinz
Wolfgang Stoecklein
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 EP1831537A1 publication Critical patent/EP1831537A1/fr
Application granted granted Critical
Publication of EP1831537B1 publication Critical patent/EP1831537B1/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
    • 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
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0045—Three-way valves

Definitions

  • the invention relates to an injector for an internal combustion engine according to the preamble of patent claim 1.
  • Such an injector is for example by the US-A-2004/0129804 known.
  • an injector for an internal combustion engine with a control valve for opening and closing a nozzle needle comprises a housing and an actuator, wherein in the housing a stepped bore having a second portion (spring chamber) is formed for receiving a valve body, wherein a first portion of the stepped bore as a bypass and a third portion of the stepped bore are formed as an outlet and wherein Outflow channel opens into the second section of the stepped bore.
  • a first valve seat is provided, wherein the valve body has a valve cone cooperating with the first valve seat.
  • valve body is pressed against a plunger of an actuator by a closing spring arranged in the second section of the stepped bore and is guided in the third section of the stepped bore, wherein one or more passages for the control quantity of the injector are present in this section.
  • valve body is guided in the second section (spring chamber) of the stepped bore, ensures that the valve cone of the Valve body always almost centric and slipping on the valve seat of the housing. This avoids, first, local overstressing of the valve plug and valve seat, and reduces wear of the valve seat and poppet. Both effects cause the valve lift changes only slightly during operation of the internal combustion engine, so that the operating behavior of the internal combustion engine remains approximately the same over the entire life.
  • the game between stepped bore and the guide portion of the valve body is so large that the valve body in the closed position of the control valve centered on the valve seat of the housing, as only then closes the control valve tight.
  • the injector according to the invention provide that the first section (inlet) of the stepped bore communicates with a control chamber of the injector, while the third section (outlet) of the stepped bore communicates with a fuel return.
  • the closing spring acts on the valve body against the actuating direction of the actuator. This ensures that the valve body always occupies a defined position and the control valve is closed when the actuator is de-energized.
  • the closing spring is at least indirectly supported against the housing and a spring plate of the valve body.
  • valve body is guided on the spring plate or that a sleeve is provided in the spring chamber and that the valve body is guided by the sleeve.
  • the passages are alternatively designed as grooves, flattenings and / or longitudinal bores extending in the longitudinal direction of the valve body.
  • the flow resistance of the control valve in the open state can be reduced so far that the function of the injector is not affected by the leadership of the valve body in the stepped bore.
  • the housing can be made in two parts. In this case, the control valve can be integrated both as a separate component and in the injector. In the latter case, the housing of the control valve is also the housing of the injector at the same time.
  • control valve can be designed as a 2/3-way control valve.
  • multiple injections can be realized more easily and there are additional possibilities of injection molding.
  • the valve body can be actuated by a piezoelectric actuator.
  • a piezoelectric actuator As a result, extremely fast control movements are possible.
  • the seat in the housing and the valve plug on the valve body does not wear appreciably, despite the short travel of a piezoelectric actuator, the function of the control valve over the entire life of the engine guaranteed.
  • the injector according to the invention is used in common rail fuel injection systems.
  • FIG. 1 an injector with a control valve 15 according to the invention is shown. Fuel is passed through a feed channel 5 to an injection nozzle 7 and through an inlet throttle 9 into a control chamber 11 via a high-pressure port 1.
  • the control chamber 11 is connected via a drain channel 12 and an outlet throttle 13 with a fuel return 17.
  • a bypass 14 establishes a hydraulic connection between the inlet channel 5 and an input of the control valve 15.
  • the control chamber 11 is bounded by a control piston 19.
  • a nozzle needle 21 connects, which prevents the pressurized fuel flows between the injections in the combustion chamber, not shown.
  • Control piston 19 and nozzle needle 21 may also be made in one piece.
  • the nozzle needle 21 has a change in cross section from a larger diameter 25 to a smaller diameter 27. With its larger diameter 25, the nozzle needle 21 is guided in a sleeve 28.
  • FIG. 2 is a first embodiment of a inventive control valve 15 shown enlarged.
  • the two-part housing which consists of the parts 29a and 29b, has a stepped bore 41.
  • a first portion 41a of the stepped bore forms the bypass 14 of the control valve 15.
  • This bypass 14 is hydraulically connected to the inlet channel 5 of the injector (not shown).
  • a second portion 41b forms a spring space, while a third portion 41c of the stepped bore 41 forms the outlet of the control valve 15. This outlet is connected to the fuel return 17 (see FIG. 1 ) hydraulically connected.
  • the outflow channel 12 opens into the second section 41b of the stepped bore with an outflow throttle 13.
  • the outflow channel 12 begins in the control chamber 11 of the injector.
  • a first valve seat 43 is formed between the sections 41b and 41c of the stepped bore 41.
  • a valve cone 47 is formed, which cooperates with the first valve seat 43.
  • a stub 49 is formed on the valve body 45, which abuts with its end face against a plunger 51 of a piezoelectric actuator (not shown).
  • a spring plate 53 is formed on the valve body 45. Between the spring plate 53 and the housing part 29b, a closing spring 55 is clamped, which presses the valve body 45 against the first valve seat 43 and / or against the plunger 51 of the piezoelectric actuator, not shown.
  • FIG. 2 illustrated embodiment of a control valve 15 is designed as a double-switching control valve.
  • formed as a flat seat second valve seat 57 is formed at the transition between the first portion 41 a and 41 b of the stepped bore 41.
  • This second valve seat 57 cooperates with an end face 59 of the valve body 45.
  • switching position of the control valve 15 is a hydraulic connection between the inlet channel 5 via the bypass 14, the flow channel 12 and the outlet throttle 13 to the control chamber eleventh
  • valve body 45 When the valve body 45 is held in this second switch position (not shown), the hydraulic connection is between the drain throttle 13 and the fuel return 17 is opened. As long as this hydraulic connection exists, the nozzle needle 21 of the injector lifts from its nozzle needle seat, so that fuel is injected into the combustion chamber of the internal combustion engine.
  • the spring plate 53 is tuned in its diameter to the diameter of the second portion 41b of the stepped bore 41 that a very small gap "s" between the spring plate 53 and the second portion 41b of the stepped bore remains.
  • This gap s is dimensioned so that the valve body 45 is guided laterally, so that the valve cone 47 always impinges at exactly the same location of the valve seat 43 when the control valve 15 is closed.
  • the slip and thus the wear on the valve cone 47 and the first valve seat 43 is significantly reduced.
  • the gap "s" must be sized so large that the valve cone 47 is centered in the first valve seat 43 itself.
  • the guide of the valve body 45 on the outer diameter of the spring plate 53 is only intended to prevent the valve body 45 is deflected appreciably laterally. If this should happen during operation of the internal combustion engine, would the poppet 47 eccentrically impinge on the valve seat 43, which may result in local overstress. By the force of the closing spring 45, the valve body 45 would then be centered in the first valve seat 43.
  • the resulting relative movement between the first valve seat 43 and valve cone 47 (slip) leads to wear of the components involved, so that the stroke of the valve body 45 significantly changes between the first switching position and the second switching position during the life of the internal combustion engine. This leads to a deteriorated performance and possibly even malfunctions, since, as is known, the travel of piezo actuators is relatively small.
  • a thickness of the gap "s" of less than 0.1 mm has proven to be advantageous.
  • FIG. 2a is a plan view of the spring plate 53 along the line AA shown. From this representation, it is clear that the gap s is not present over the entire circumference of the spring plate, but that the spring plate 53 has three flats 61. These flats 61 allow the outflow of the control amount past the spring plate 53.
  • FIGS. 2b and 2c Further embodiments of passages according to the invention are shown. In the embodiment according to FIG. 2b are four radially arranged grooves 63 provided in the spring plate 53, while in the embodiment according to Figure 2c four holes 65 in the spring plate 53 are present.
  • valve body 45 is guided in the third portion 41 c of the stepped bore 41.
  • the Diameter of the stub 49 is chosen so that again a gap "s" between the stub 49 and the third portion 41 c of the stepped bore 41 sets. Again, it has proved to be advantageous if the gap s is less than 0.05 mm.
  • FIGS. 3a and 3b are sectional views along the line BB of two different versions of inventive stub 49 shown.
  • Flats 61 are provided, while in the embodiment according to FIG. 3b Grooves 63 are provided which extend over the entire length of the guide portion between the stub 49 and the third portion 41 c of the stepped bore 41.
  • the invention is not limited to the explicitly illustrated forms of the flats 61, the grooves 63 and the holes 65.
  • FIG. 4 another embodiment of a control valve 15 according to the invention is shown.
  • the valve body 45 is guided in the region of the portion 41 b of the stepped bore through a sleeve 67.
  • the sleeve 67 is designed as a ring with approximately square cross section, while on the left side, the sleeve 67 has an L-shaped cross-section.
  • the main difference between these two embodiments is in the overlap H 1 and H 2 between the valve body 45 and the sleeve 67th
  • FIG. 5 another embodiment of a control valve 15 according to the invention is shown.
  • the sleeve 67 is disposed between the spring plate 53 and the closing spring 55.
  • two different shapes of sleeves 67 are shown. Both embodiments have in common that the passages are designed in the form of grooves 63.
  • grooves 63 are additionally provided in the valve body.
  • the spring plate 53 bores 65 which also serve to discharge the control and leakage amount from the injector (not shown) through the control valve 15 into the fuel return 17.

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)
  • Lift Valve (AREA)
  • Paper (AREA)

Claims (13)

  1. Injecteur pour un moteur à combustion interne avec une soupape de commande (15) pour ouvrir et fermer une aiguille d'injecteur (21), la soupape de commande (15) comprenant un boîtier (29) et un actionneur, un alésage étagé (41) ayant une deuxième portion (41b) pour recevoir un corps de soupape (45) étant réalisé dans le boîtier (29), une première portion (41a) de l'alésage étagé (41) étant réalisée sous forme de dérivation (14) et une troisième portion (41c) de l'alésage étagé (41) étant réalisée sous forme de sortie, un canal de sortie (12) débouchant dans la deuxième portion (41b) de l'alésage étagé (41), avec un premier siège de soupape (43) coopérant avec le corps de soupape (45), le corps de soupape (45) étant pressé par un ressort de fermeture (55) contre un poinçon (51) d'un actionneur,
    caractérisé en ce que
    le corps de soupape (45) présente un cône de soupape (47) coopérant avec le premier siège de soupape (43), en ce que le ressort de fermeture (55) est disposé dans la deuxième portion (41b) de l'alésage étagé (41) et en ce que le corps de soupape (45) est guidé dans la deuxième portion (41b) de l'alésage étagé (41), un ou plusieurs passages pour la quantité de commande de l'injecteur étant prévus dans cette portion (41b).
  2. Injecteur selon la revendication 1, caractérisé en ce que la première portion (41a) de l'alésage étagé (41) est en liaison avec un canal d'afflux (5) de l'injecteur.
  3. Injecteur selon la revendication 1 ou 2, caractérisé en ce que la troisième portion (41c) de l'alésage étagé (41) est en liaison avec un retour de carburant (17).
  4. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce que le ressort de fermeture (55) agit sur le corps de soupape (45) à l'encontre de la direction d'actionnement de l'actionneur.
  5. Injecteur selon la revendication 4, caractérisé en ce que le ressort de fermeture (55) s'appuie au moins indirectement contre le boîtier (29) et contre une coupelle de ressort (53) du corps de soupape (45).
  6. Injecteur selon la revendication 5, caractérisé en ce que le corps de soupape (45) est guidé sur la coupelle de ressort (53).
  7. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une douille (67) est prévue dans la deuxième portion (41b) de l'alésage étagé (41) et en ce que le corps de soupape (45) est guidé par la douille (67).
  8. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce que le ou les passages sont réalisés sous forme de rainures (63) s'étendant dans la direction longitudinale du corps de soupape (45), de méplats (61) et/ou d'alésages longitudinaux (65).
  9. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un deuxième siège de soupape (57) est réalisé entre la première et la deuxième portion (41a, 41b) de l'alésage étagé (41), et en ce qu'une surface frontale (33) du corps de soupape (45) coopère avec le deuxième siège de soupape (57),
  10. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce que le boîtier (29) est réalisé en deux parties.
  11. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce que la soupape de commande (15) est une soupape de commande à 3/2 voies.
  12. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce que le corps de soupape (45) est actionné par un actionneur piézoélectrique.
  13. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce que l'injecteur est utilisé dans un système d'injection de carburant à rampe commune.
EP05808118A 2004-12-22 2005-11-22 Injecteur de systeme d'injection de carburant d'un moteur a combustion interne Not-in-force EP1831537B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004061800A DE102004061800A1 (de) 2004-12-22 2004-12-22 Injektor eines Kraftstoffeinspritzsystems einer Brennkraftmaschine
PCT/EP2005/056138 WO2006067015A1 (fr) 2004-12-22 2005-11-22 Injecteur de systeme d'injection de carburant d'un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1831537A1 EP1831537A1 (fr) 2007-09-12
EP1831537B1 true EP1831537B1 (fr) 2009-03-04

Family

ID=35695551

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05808118A Not-in-force EP1831537B1 (fr) 2004-12-22 2005-11-22 Injecteur de systeme d'injection de carburant d'un moteur a combustion interne

Country Status (6)

Country Link
US (1) US7621258B2 (fr)
EP (1) EP1831537B1 (fr)
CN (1) CN101061308B (fr)
AT (1) ATE424506T1 (fr)
DE (2) DE102004061800A1 (fr)
WO (1) WO2006067015A1 (fr)

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DE102007004380A1 (de) 2007-01-29 2008-07-31 Robert Bosch Gmbh Injektor mit piezoelektrischem Aktuator
DE102007006942A1 (de) 2007-02-13 2008-08-14 Robert Bosch Gmbh Injektor mit piezoelektrischem Aktuator
DE102007035698A1 (de) * 2007-07-30 2009-02-05 Robert Bosch Gmbh Kraftstoffeinspritzventil mit verbesserter Dichtheit am Dichtsitz eines druckausgeglichenen Steuerventils
DE102007062178A1 (de) 2007-12-21 2009-06-25 Robert Bosch Gmbh Injektor eines Kraftstoffeinspritzsystems mit einem 3/2-Wege-Steuerventil
DE102008001116A1 (de) 2008-04-10 2009-10-15 Robert Bosch Gmbh Kraftstoff-Injektor sowie Kraftstoff-Einspritzsystem
DE102008001330A1 (de) 2008-04-23 2009-10-29 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102008001913A1 (de) * 2008-05-21 2009-11-26 Robert Bosch Gmbh Kraftstoff-Injektor
DE102008040637A1 (de) 2008-07-23 2010-01-28 Robert Bosch Gmbh Kraftstoffeinspritzventileinrichtung
DE102009000170B4 (de) * 2009-01-13 2017-11-30 Robert Bosch Gmbh Kraftstoffinjektor
DE102009003145A1 (de) 2009-05-15 2010-11-18 Robert Bosch Gmbh Kraftstoffinjektor für Brennkraftmaschinen
DE102009028979A1 (de) * 2009-08-28 2011-03-03 Robert Bosch Gmbh Kraftstoffinjektor für eine Brennkraftmaschine
DE102009046563A1 (de) * 2009-11-10 2011-05-12 Robert Bosch Gmbh Kraftstoffinjektor
DE102009055052A1 (de) 2009-12-21 2011-06-22 Robert Bosch GmbH, 70469 Brennstoffeinspritzventil
DE102010001315A1 (de) 2010-01-28 2011-08-18 Robert Bosch GmbH, 70469 Kraftstoffinjektor
DE102010001612A1 (de) 2010-02-05 2011-08-11 Robert Bosch GmbH, 70469 Kraftstoffinjektor
DE102010039051A1 (de) * 2010-08-09 2012-02-09 Robert Bosch Gmbh Einspritzvorrichtung
EP2458194B1 (fr) 2010-09-29 2014-08-20 Robert Bosch GmbH Soupape d'injection de carburant pour moteurs à combustion interne
US8448878B2 (en) * 2010-11-08 2013-05-28 Caterpillar Inc. Fuel injector with needle control system that includes F, A, Z and E orifices
DE102010044119A1 (de) * 2010-11-18 2012-05-24 Robert Bosch Gmbh Mengensteuerventil eines Kraftstoffsystems
DE102011007106A1 (de) 2011-04-11 2012-10-11 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102011078399A1 (de) * 2011-06-30 2013-01-03 Robert Bosch Gmbh Kraftstoffinjektor
US8690075B2 (en) * 2011-11-07 2014-04-08 Caterpillar Inc. Fuel injector with needle control system that includes F, A, Z and E orifices
DE102013212259A1 (de) 2013-06-26 2014-12-31 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102014220841A1 (de) * 2014-10-15 2016-04-21 Continental Automotive Gmbh Einspritzventil zum Einspritzen von Fluid in einen Brennraum einer Brennkraftmaschine
JP6172113B2 (ja) * 2014-10-28 2017-08-02 株式会社デンソー 燃料噴射弁
JP6365350B2 (ja) * 2015-03-04 2018-08-01 株式会社デンソー 燃料噴射弁
DE102015111813B4 (de) * 2015-07-21 2017-03-02 Kendrion (Villingen) Gmbh Sitzventil
DE102018200288A1 (de) * 2018-01-10 2019-07-11 Continental Automotive Gmbh Piezo-Common-Rail-Injektor mit nach innen öffnendem Servoventil
JP2021080844A (ja) * 2019-11-15 2021-05-27 株式会社デンソー 燃料噴射装置
US11591995B2 (en) * 2020-09-15 2023-02-28 Caterpillar Inc. Fuel injector having valve seat orifice plate with valve seat and drain and re-pressurization orifices

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DE10103089A1 (de) * 2001-01-24 2002-08-08 Bosch Gmbh Robert 3/2-Wegeventil
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US6769635B2 (en) * 2002-09-25 2004-08-03 Caterpillar Inc Mixed mode fuel injector with individually moveable needle valve members
US7243902B2 (en) * 2002-11-08 2007-07-17 Robert Bosch Gmbh Pressure-compensated, directly controlled valve
DE10334771A1 (de) * 2003-07-30 2005-02-24 Robert Bosch Gmbh Schaltventil mit Druckausgleich für einen Kraftstoffinjektor mit Druckverstärker
DE10335211A1 (de) * 2003-08-01 2005-02-17 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine
DE10338228A1 (de) * 2003-08-20 2005-03-10 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen

Also Published As

Publication number Publication date
DE102004061800A1 (de) 2006-07-06
ATE424506T1 (de) 2009-03-15
CN101061308B (zh) 2010-08-18
DE502005006773D1 (de) 2009-04-16
EP1831537A1 (fr) 2007-09-12
US20090145404A1 (en) 2009-06-11
WO2006067015A1 (fr) 2006-06-29
CN101061308A (zh) 2007-10-24
US7621258B2 (en) 2009-11-24

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