EP1379776B1 - Injecteur a action de restriction - Google Patents

Injecteur a action de restriction Download PDF

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Publication number
EP1379776B1
EP1379776B1 EP02740226A EP02740226A EP1379776B1 EP 1379776 B1 EP1379776 B1 EP 1379776B1 EP 02740226 A EP02740226 A EP 02740226A EP 02740226 A EP02740226 A EP 02740226A EP 1379776 B1 EP1379776 B1 EP 1379776B1
Authority
EP
European Patent Office
Prior art keywords
nozzle needle
nozzle
fuel
needle
fuel injector
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.)
Expired - Lifetime
Application number
EP02740226A
Other languages
German (de)
English (en)
Other versions
EP1379776A2 (fr
Inventor
Friedrich Boecking
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 EP1379776A2 publication Critical patent/EP1379776A2/fr
Application granted granted Critical
Publication of EP1379776B1 publication Critical patent/EP1379776B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices
    • F02M61/163—Means being injection-valves with helically or spirally shaped grooves
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies

Definitions

  • injectors For injecting fuel into the combustion chambers of an internal combustion engine injectors are used, at which the start of injection and the injection quantity are adjusted by electrical control by means of a solenoid valve or a piezoelectric actuator. Injectors injectors are included. The injectors hold the injectors, which are tuned to the respective conditions of the internal combustion engine on which they are used.
  • the design of the injection nozzle is crucial for the metered injection in terms of injection duration and injection quantity per degree crank angle and with regard to the preparation of the fuel with respect to injection jet shape and atomization of the fuel in the combustion chamber.
  • GB 2 335 000 refers to a fuel injector with a restricted fuel feed to a needle valve.
  • the fuel injector comprises a nozzle needle which is slidably received in a bore provided in a nozzle body.
  • the nozzle needle forms with the injector both a fuel reservoir and a fuel receiving chamber for the pending under high pressure fuel.
  • a flow channel system is provided for the fuel, which is the inlet limited to the fuel. If the nozzle needle is in an open position, fuel flows in the direction of the reservoir. On the other hand, if the nozzle needle moves upwards in the injector body, then a heightened volume of fuel flows in the direction of the injection nozzle
  • a fuel injector in which, within a gap surrounding the nozzle needle on the nozzle needle, a collar is formed, which forms, for example, an annular gap with the wall of the intermediate space.
  • the annular gap acts as a throttle. From the intermediate space, the fuel passes along flow surfaces on the nozzle needle either into a nozzle space and from there via a gap to the injection opening or else directly to the injection opening.
  • the solution according to the invention causes a faster closing of the nozzle needle, which can be avoided in particular by increased needle portions of hydrocarbon fractions in the exhaust gas of internal combustion engines.
  • the hitherto occurring higher HC components in the exhaust gas of an internal combustion engine touched last but not least that at a comparatively slow expiring needle closing through the still open injector fuel into the combustion chamber, but could not be burned because the combustion has already largely expired against needle closing is. If a faster needle closure is achieved by means of the solution according to the invention, the increase of the HC content in the exhaust gas of the internal combustion engine can be avoided.
  • a fast adjusting the nozzle needle forming the injection curve. i.e. its adaptation to the running in the combustion chamber combustion, in terms of Zündverznges, better reproducible.
  • the thrust bearing proposed according to the invention can be embodied both as a region of the nozzle needle which has a larger diameter and as a projection guided in the injector housing at a small distance at the nozzle needle circumference.
  • the throttle point - preferably designed as a throttle section - can be formed below a guide portion on the nozzle needle; Furthermore, the throttle section can be integrated in the guide section on the nozzle needle.
  • the arrangement of the thrust point below a guide portion or in the alternative integrated into this, has the advantageous effect that is avoided by the proximity of the thruster to the guide portion deflecting the nozzle needle from the centered position.
  • a deflection of the nozzle needle transversely to the nozzle needle axis would result in a large deviation of the flow rate, which however is ruled out due to the solution proposed according to the invention.
  • FIG. 1 is an injector of a Kraftstoffinjekiors removed, which can be controlled by a solenoid valve.
  • An injector 1 for injecting fuel into the combustion chambers of a combustion engine comprises an injector body 2 in which a nozzle needle 5 is received.
  • a high-pressure bore 3 is formed, via which a nozzle chamber 4 can be acted upon by high-pressure fuel.
  • the high-pressure bore 3 communicates with a high-pressure accumulation space (common rail), not shown here, in which a largely constant high pressure is generated.
  • the nozzle needle 5 comprises a first guide portion 6 and a second guide portion 7, with which it is guided in the injector body 2.
  • a pressure stage 8 is formed on the nozzle needle 5.
  • a feed ring 9 connects, which is designed in diameter 10.
  • the second guide section 7 is formed on the nozzle needle 5.
  • flow surfaces 20 may be integrated for the fuel to ensure flow of the fuel from the nozzle chamber 4 via the inlet ring 9 to the nozzle tip.
  • the injector body 2 is formed in the region of the second guide section 7 in a slightly reduced diameter 11.
  • the injector body 2 as shown in FIG. 1 goes over into a nozzle body 16.
  • the bore in the nozzle body 16, which encloses the nozzle needle 5, is designed in the region of the second guide section 7 with a smaller diameter, so that it is ensured that the nozzle needle 5 is guided in the nozzle-side region only within the second guide section 7.
  • the throttle point 17 is preferably designed as a throttle section, which extends in the axial direction of the nozzle needle 5 over a gap height h 1 (reference numeral 19). Between the nozzle body 16 and the throttling point 17, which, as shown in FIG. 1 is formed as a nozzle needle 5, a gap width 18, via which the throttling effect is adjustable depending on the design of the throttle point 17. Preferably, by means of the solution proposed according to the invention, throttle effects between 0.2 and 7% will be realized.
  • a conical seat 14 is formed on the latter.
  • the nozzle needle tip 12 In the lower region of the injection nozzle 12, which is preferably designed as a suction nozzle, a conical seat 14 is formed on the latter.
  • the nozzle needle tip 12 In the closed state of the nozzle needle 5 is the nozzle needle tip 12 with its seat 14 on the nozzle seat 13, which is formed on the nozzle needle 5 facing wall of the nozzle body 16.
  • the nozzle needle 5 is driven with its nozzle needle tip 12 into the nozzle seat 13, so that the injection port 15, which projects into the combustion chamber of an internal combustion engine, is closed by the nozzle tip 15.
  • the throttling action only occurs when the nozzle needle 5 is driven into the control chamber (not shown here), which results in a pressure drop at the nozzle needle tip 12, which can be advantageously utilized for rapid needle closure by pressurizing the control chamber associated with the nozzle needle 5.
  • the representation according to FIG. 2 is an embodiment of the present invention proposed solution with overflow can be seen above a thrust point.
  • a nozzle needle 30 is movably received in the vertical direction.
  • a first guide portion 6 and a second guide portion 7 is formed.
  • a high-pressure bore 3 is formed, which opens into a nozzle chamber 4.
  • the high-pressure bore 3 communicates with a high-pressure collecting chamber (common rail), not shown.
  • an overflow channel system 31 is formed, which is surrounded by a substantially pressurized fuel nozzle space 4.
  • Below the overflow channel system 31 is analogous to the representation of the nozzle needle 5 in FIG. 1 at the nozzle needle 30 a thrust point 17 is formed.
  • Throttling point 17 as shown in FIG. 2 is preferably carried out on the nozzle needle 30 as a throttle section, which extends in an axial gap height 19 in the axial direction of the nozzle needle 30. Between the second guide section 7 surrounding bore of the nozzle body 16 and the throttle point, a gap width 19, over which depending on the design, the throttle effect can be varied. Underneath the throttling point 17 is a nozzle needle 30 as shown in FIG FIG. 2 a seat diameter 14 is formed, which is retracted into a nozzle seat 13 in the nozzle body 16 of the injector body 2. Im in FIG. 2 reproduced state is the injection port 15, which projects into the combustion chamber of an internal combustion engine, closed by the nozzle needle tip 12, which has moved into its nozzle seat 13.
  • the overflow 31 with an inclination 32 resulting in a limitation of adjusting in the direction of the nozzle needle tip 12 fuel flow.
  • the Androsselstelle 17 causes a pressure drop in the nozzle needle tip 12, so that, taking into account the adjusting itself in the control chamber pressure levels a faster closing of the nozzle needle tip 12 into its nozzle seat 13 can achieve. This prevents fuel from being injected into the combustion chamber of an internal combustion engine towards the end of combustion, so that unburnt hydrocarbons can no longer be formed due to the largely completed combustion process.
  • FIG. 3 is a further embodiment of the solutions according to the invention with schematically illustrated pressure-relieved control chamber refer.
  • a nozzle body 16 is accommodated on an injector body 2.
  • injector body 2 and nozzle body 16 a nozzle needle 40 is movably received in the vertical direction.
  • this is surrounded by a ring 41, while the upper end face of the nozzle needle 40 is a boundary wall of a control space 42 shown here only schematically.
  • a closing filter element 43 is received between the end face of the ring 41 and a collar 44 of the nozzle needle 40.
  • flow relief surfaces 46 are received on the circumference of the nozzle needle 40, through which the fuel shoots into the nozzle body 16 in the direction of the nozzle needle tip 12.
  • the flow relief surfaces 46 are on the nozzle needle 40 as shown in FIG. 3 formed on a guide portion 45 which is guided in the bore of the nozzle body 16.
  • the guide portion 45 is formed in a diameter 49.
  • the throttle point 17 which is preferably designed as a throttle section and extending in the axial direction with the height h 1 (reference numeral 19).
  • An inlet chamber 47 in the nozzle body 16 serves to receive the volume of fuel flowing in via the flow rake surfaces 46 and the throttling point 17.
  • this comprises a seat surface diameter 14 which bears against the nozzle seat 13 of the nozzle body 16 and thus closes the injection opening 15 projecting into the combustion chamber of an internal combustion engine.
  • the configuration of the nozzle needle tip of the nozzle needle 40 is, for example, a blind-hole nozzle; In addition, the formation of the nozzle needle tip 12 would also be possible as a Weglochdüse.
  • the effect of the pressure drop at the nozzle needle tip 12 achievable by the throttle point 17 located near the nozzle allows a quicker closing of the nozzle needle 40 and therefore a precise termination of the injection phase, so that the occurrence of unburned hydrocarbons in the exhaust gas is considerably reduced when using the solution according to the invention, if not is completely excluded.
  • the arrangement of the throttling point 17 behind a second guide portion 7 of the nozzle needle 5 and the nozzle needle 30 and behind a guide portion 45 of the nozzle needle 40 or its integration therein prevents deflection of the nozzle needle 5, 30, 40 according to the illustrated embodiments such that the flow rate changed to the nozzle needle tip 12 by deflection thereof transversely to its axis and thus greatly changes the flow volume.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (7)

  1. Injecteur de carburant pour injecter du carburant dans les chambres de combustion d'un moteur à combustion interne, avec un corps d'injecteur (2, 16) dans lequel il se trouve une aiguille d'injecteur mobile (5, 30, 40), dont la pointe de l'aiguille d'injecteur (12) ferme ou ouvre un orifice d'injection (15) dans la chambre de combustion et l'aiguille d'injecteur (5, 30, 40) présente au moins une partie de guidage (6, 7, 45), caractérisé en ce qu'une région d'étranglement (17) est réalisée en dessous d'une partie de guidage (7, 45), du côté du corps d'injecteur, dans la région du siège d'injecteur (13, 14) de l'aiguille d'injecteur (5, 30, 40), dans lequel la région d'étranglement (17) se raccorde directement à la partie de guidage (7, 45) du côté du corps d'injecteur, ou est intégrée dans celle-ci.
  2. Injecteur de carburant selon la revendication 1, caractérisé en ce que la région d'étranglement (17) se présente sous la forme d'une zone d'étranglement coaxiale à l'aiguille d'injecteur (5, 30, 40).
  3. Injecteur de carburant selon la revendication 2, caractérisé en ce que la zone d'étranglement est réalisée avec une hauteur d'écartement (19) dans la région d'étranglement (17) de l'aiguille d'injecteur (5, 30, 40).
  4. Injecteur de carburant selon la revendication 2, caractérisé en ce qu'une largeur d'écartement minimale (18) est réalisée entre la région d'étranglement (17) et le corps d'injecteur (2), de telle manière que le flux de carburant soit étranglé de 0,2 à 7 %.
  5. Injecteur de carburant selon la revendication 1, caractérisé en ce que la région d'étranglement (17) est réalisée sous la forme d'une région de plus grand diamètre de l'aiguille d'injecteur (5, 30, 40).
  6. Injecteur de carburant selon la revendication 1, caractérisé en ce que la région d'étranglement (17) est réalisée sous la forme d'une saillie dans le corps d'injecteur (2, 16).
  7. Injecteur de carburant selon la revendication 1, caractérisé en ce que la pointe d'aiguille d'injecteur (12) de l'aiguille d'injecteur (5, 30, 40) est une buse à fond plein (48).
EP02740226A 2001-04-10 2002-03-30 Injecteur a action de restriction Expired - Lifetime EP1379776B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2001117861 DE10117861A1 (de) 2001-04-10 2001-04-10 Injektordüse mit Drosselverhalten
DE10117861 2001-04-10
PCT/DE2002/001163 WO2002084109A2 (fr) 2001-04-10 2002-03-30 Injecteur a action de restriction

Publications (2)

Publication Number Publication Date
EP1379776A2 EP1379776A2 (fr) 2004-01-14
EP1379776B1 true EP1379776B1 (fr) 2009-10-21

Family

ID=7681076

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02740226A Expired - Lifetime EP1379776B1 (fr) 2001-04-10 2002-03-30 Injecteur a action de restriction

Country Status (3)

Country Link
EP (1) EP1379776B1 (fr)
DE (2) DE10117861A1 (fr)
WO (1) WO2002084109A2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10346212A1 (de) * 2003-10-06 2005-04-21 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
ATE461363T1 (de) 2006-07-27 2010-04-15 Magneti Marelli Spa Kraftstoffeinspritzventil für eine direkteinspritzende brennkraftmaschine
US7690588B2 (en) * 2007-07-31 2010-04-06 Caterpillar Inc. Fuel injector nozzle with flow restricting device
EP2568157A1 (fr) 2011-09-08 2013-03-13 Delphi Technologies Holding S.à.r.l. Buse à injection
CN109681360A (zh) * 2019-02-28 2019-04-26 一汽解放汽车有限公司 一种用于燃料喷射阀的长针阀

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0449763B1 (fr) * 1990-03-28 1994-10-12 Stanadyne Automotive Corp. Injecteur de carburant
JPH11200999A (ja) * 1998-01-09 1999-07-27 Nissan Motor Co Ltd 内燃機関用燃料噴射弁
GB2335000A (en) * 1998-03-05 1999-09-08 Lucas Ind Plc Fuel injector having a restricted fuel flow path provided by a needle valve
EP0971118A2 (fr) * 1998-07-06 2000-01-12 Isuzu Motors Limited Injecteur de carburant

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT288784B (de) * 1966-10-20 1971-03-25 Bosch Gmbh Robert Elektromagnetisch betätigtes Kraftstoff-Einspritzventil für Brennkraftmaschinen
JPS6052310B2 (ja) * 1980-09-05 1985-11-18 日産自動車株式会社 スロツトル型燃料噴射弁
JPS61164068A (ja) * 1985-01-14 1986-07-24 Nissan Motor Co Ltd スロツトル型燃料噴射ノズル
JPH07259704A (ja) * 1994-03-24 1995-10-09 Nissan Diesel Motor Co Ltd 内燃機関の燃料噴射ノズル
DE19701879A1 (de) 1997-01-21 1998-07-23 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen
DE10054182A1 (de) * 2000-11-02 2002-05-29 Siemens Ag Fluiddosiervorrichtung mit Drosselstelle
DE10055651A1 (de) * 2000-11-10 2002-05-23 Bosch Gmbh Robert Druckgesteuerter Injektor mit optimierten Einspritzverlauf über den Hubweg

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0449763B1 (fr) * 1990-03-28 1994-10-12 Stanadyne Automotive Corp. Injecteur de carburant
JPH11200999A (ja) * 1998-01-09 1999-07-27 Nissan Motor Co Ltd 内燃機関用燃料噴射弁
GB2335000A (en) * 1998-03-05 1999-09-08 Lucas Ind Plc Fuel injector having a restricted fuel flow path provided by a needle valve
EP0971118A2 (fr) * 1998-07-06 2000-01-12 Isuzu Motors Limited Injecteur de carburant

Also Published As

Publication number Publication date
DE10117861A1 (de) 2002-10-24
EP1379776A2 (fr) 2004-01-14
DE50213943D1 (de) 2009-12-03
WO2002084109A2 (fr) 2002-10-24
WO2002084109A3 (fr) 2002-12-12

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