WO2002084109A2 - Injecteur a action de restriction - Google Patents

Injecteur a action de restriction Download PDF

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Publication number
WO2002084109A2
WO2002084109A2 PCT/DE2002/001163 DE0201163W WO02084109A2 WO 2002084109 A2 WO2002084109 A2 WO 2002084109A2 DE 0201163 W DE0201163 W DE 0201163W WO 02084109 A2 WO02084109 A2 WO 02084109A2
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle needle
nozzle
fuel injector
fuel
injector according
Prior art date
Application number
PCT/DE2002/001163
Other languages
German (de)
English (en)
Other versions
WO2002084109A3 (fr
Inventor
Friedrich Boecking
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
Priority to DE50213943T priority Critical patent/DE50213943D1/de
Priority to EP02740226A priority patent/EP1379776B1/fr
Publication of WO2002084109A2 publication Critical patent/WO2002084109A2/fr
Publication of WO2002084109A3 publication Critical patent/WO2002084109A3/fr

Links

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 are used to inject fuel into the combustion chambers of a Nerbremiimgsl raftmasclihie, on which the start of injection and the injection quantity are set by electrical control by means of a solenoid valve or a piezo actuator. Injectors are accommodated in the injectors. The injectors hold the injection nozzles, which are matched to the respective conditions of the nerbrennerl ⁇ aft machine on which they are used. The design of the injection nozzle is crucial for the metered injection with respect to the injection time and the injection quantity per degree ..Kurbelwinkel and with regard to the processing of the fuel in terms of EMSP 'ritzstralilform and atomization of the fuel hn combustion chamber.
  • Ki-Aftscherin injection device for Bremiki Aft machines emerges.
  • This comprises a common high-pressure accumulator (Comrnon Rail) which can be filled with fuel from a high-pressure pump and which is connected via injection lines to injection valves projecting into the combustion chamber of the internal combustion engine to be supplied. Their Offiiungs- and closing movements are respectively controlled by a 'electrically actuated control valve, wherein the control valve is designed as a 3/2-Nentil ege.
  • This connects a high-pressure channel opening at an injection opening of the injection valve to the injection line or a relief line.
  • a hydraulic work space that can be filled with high-pressure fuel is provided on the control valve member of the control valve and can be opened in a relief channel to adjust the setting position of the control valve member of the control valve.
  • GB 2 335 000 relates to a fuel injector with a restricted fuel supply on a needle valve.
  • Thestoffmjel tor includes a nozzle needle which is slidably received in a bore provided in a nozzle body.
  • the nozzle needle forms with the injector body both a fuel storage space and a fuel chamber for the fuel under high pressure.
  • a flow channel system for the fuel is provided on the nozzle needle, which limited fuel flow.
  • the solution according to the invention causes the nozzle needle to close more quickly, as a result of which, in particular, increased hydrocarbon fractions in the exhaust gas from Breririkrafta machines can be avoided by delayed needle closing.
  • the higher HC proportions in the exhaust gas of a Nerbrennerkraftmachinenrril occur up to now not least because in a comparatively slow needle closing fuel came into the combustion chamber through the still open injection nozzle, which, however, should no longer be burned, since the combustion against needle closing is already largely done has expired.
  • faster needle closing is achieved by means of the solution according to the invention, the increase in the HC content in the exhaust gas of the combustion juicing machine can be avoided.
  • the formation of the injection course i.e. its adaptation to the combustion taking place in the combustion chamber, with regard to the ignition delay, is more reproducible.
  • the throttling point proposed according to the invention can be designed both as an area of the nozzle needle with a larger diameter and as a projection in the injector housing, which is spaced at a small distance on the circumference of the nozzle needle.
  • the Androsse point - preferably designed as a throttle section - can be formed below a guide section on the nozzle needle; Furthermore, the throttle section can be integrated in the filling section on the nozzle needle.
  • throttling point on the nozzle needle or housing with regard to axial extension, i.e. With regard to the throttle gap height and the gap width, throttling in the range between 0.2 and 7% can be achieved.
  • the arrangement of the throttling point below a guide section or, in the alternative, integrated therein, has the advantageous effect that the proximity of the throttling point to the guide section prevents deflection of the nozzle needle from the centered position. Ehie deflection of the nozzle needle transversely to the nozzle needle axis would result in a large deviation in the flow rate, but this is excluded due to the solution proposed according to the invention. Throttling the flow in the area of the needle tip of the nozzle needle leads to a drop in pressure thereon. This shifts the pressure ratio to the control chamber in such a way that the Dmcl ⁇ üveau there is higher and thus a faster retraction of the nozzle needle is made possible in the seat of the injector body.
  • FIG. 1 shows an injection nozzle of a fuel injector, which can be controlled by means of a solenoid valve,
  • Figure 2 ⁇ a variant of an injection nozzle with overflow channel above a throttle point
  • Figure 3 shows a further embodiment with a schematically shown pressure releasable control room.
  • FIG. 1 is an injection nozzle of a fuel injector that can be controlled via a solenoid valve.
  • An injector 1 for injecting fuel into the brake chambers of an internal 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 fuel under high pressure.
  • the high-pressure bolster 3 is connected to a high-pressure accumulator (common rail), not shown here, in which a largely constant high pressure is generated.
  • the nozzle needle 5 comprises a first guide section 6 and a second fill section 7 with which it is guided in the projector body 2.
  • a pressure stage 8 is formed on the nozzle needle 5.
  • An inlet ring 9 which has a diameter of 10, adjoins the nozzle chamber 4 in the injector body 2. Below the inlet ring 9 between the injector body 2 and the nozzle needle 5, the 5 second filling section 7 is formed on the nozzle needle 5. Flow surfaces 20 for the fuel can be integrated in the second guide section 7 in order to ensure that the fuel flows in from the nozzle chamber 4 via the inlet ring 9 to the nozzle tip.
  • the projector body 2 is formed in the region 10 of the second filling section 7 in a slightly reduced diameter knife 11.
  • the projector body 2 as shown in FIG. 1 merges into a nozzle body 16.
  • the bore in the nozzle body 16, which surrounds the nozzle needle 5, is executed in the area of the second filling portion 7 with a smaller diameter, so that it is ensured that the nozzle needle 5 is filled in the area of the nozzle only within the second 15 guide portion 7.
  • the throttling point 17 is preferably designed as a throttling section which extends in the axial direction of the nozzle
  • a conical seat surface 14 is formed thereon.
  • the nozzle needle tip 12 rests with its seat 14 on the nozzle seat 13, which is formed on the wall of the nozzle body 16 facing the nozzle needle 5.
  • the nozzle needle 5 has moved with its nozzle needle tip 12 into the nozzle seat 13, so that the injection opening 15, which projects into the combustion chamber of a combustion engine, is closed by the nozzle tip 15.
  • the air throttling effect occurs only when the nozzle needle 5 is opened in the control chamber (not shown in more detail here), as a result of which a pressure drop occurs at the nozzle needle tip 12, which pressure drop can advantageously be used for quick needle closing by pressurizing the control chamber assigned to the nozzle needle 5.
  • FIG. 2 shows an embodiment of the solution proposed according to the invention with overflow channels above a throttle point.
  • a nozzle needle 30 is accommodated such that it can be moved in the vertical direction analogously to the illustration according to FIG.
  • a first guide section 6 and a second guide section 7 are formed on the nozzle needle 30.
  • a high-pressure bore 3 is formed, which opens into a nozzle chamber 4.
  • the high-pressure bore 3 is connected to a high-pressure plenum (Coinmon Raü), not shown, in contrast to the embodiment variant shown in FIG. 1, an overcurrent channel system 31 is formed on the nozzle needle 30 as shown in FIG Pressurized fuel nozzle chamber 4 is enclosed.
  • a throttling point 17 is formed below the overflow channel system 31 in a manner analogous to the representation of the nozzle needle 5 in FIG. 1 on the nozzle needle 30.
  • the throttling point 17 is preferably designed on the nozzle needle 30 as a throttle section which extends at an axial gap height 19 in the axial direction of the nozzle needle 30. Between the bore of the nozzle body 16 which gives the second filling section 7 and the throttling point, a gap 19 is set, via which the throttling effect can be varied depending on the design.
  • a nozzle needle 30, as shown in FIG. 2 has a seat diameter 14 which is inserted into a nozzle seat 13 in the nozzle body 16 of the injector body 2. In the state shown in FIG. 2, the injection opening 15, which protrudes into the combustion chamber of a combustion chamber, is closed by the nozzle needle tip 12, which has moved into its nozzle seat 1.
  • the overflow channels 31 can be applied to the circumference of the nozzle needle 30 in the region of the nozzle chamber 4 with an incline 32, which results in a limitation of the fuel volume flow setting in the direction of the nozzle needle tip 12.
  • the throttling point 17 causes a pressure drop in the area of the nozzle needle tip 12, so that, taking into account the pressure level which arises in the control space, the nozzle needle tip 12 closes more rapidly in its nozzle seat 13 can be achieved.
  • fuel is not injected into the brake chamber of an internal combustion engine towards the end of combustion, so that no unburned hydrocarbons can arise due to the largely complete combustion process.
  • FIG. 3 shows a further variant of the solutions according to the invention with a schematically illustrated pressure relief control chamber.
  • a fuel injector 1 for injecting fuel into the brake noise of tampering machines is accommodated in a nozzle body 16 on an injector body 2.
  • a nozzle needle 40 is received so as to be movable in the vertical direction.
  • the upper region of the nozzle needle 40 it is enclosed by a ring 41, while the upper end face of the nozzle needle 40 represents a boundary wall of a control chamber 42, which is only shown schematically here.
  • 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-free areas 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 free areas 46 are formed on the nozzle needle 40 as shown in FIG. 3 on a guide section 45 which is guided in the bore of the nozzle body 16.
  • the guide section 45 is formed in a diameter 49.
  • the throttling point 17 adjoins the guide section 45 of the nozzle needle 40, which is preferably designed as a throttling section and extends in the axial direction with the height hi (reference number 19).
  • the throttling point 17 which is formed on the nozzle needle 40, and the bore of the nozzle body 16, there is a gap width 18, which essentially determines the degree of throttling.
  • the bore, which surrounds the nozzle needle 40 in the nozzle body 16 has an enlarged diameter 50.
  • An inlet space 47 in the nozzle body 16 serves to receive the fuel volume flowing in via the flow open areas 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 configuration of the nozzle needle tip 12 would also be possible as a seat hole nozzle.
  • the arrangement of the Androsselstelle 17 behind a second Fellerrmigsabêt 7 of Düsemiadel 5 and the nozzle needle 30 or behind a guide portion 45 of the nozzle needle 40 or the integration therein prevents • deflection of Düsemiadel 5, 30, 40 according to the execution shown approximately variant such that the flow rate to the nozzle needle tip 12 changes by transferring the same across its axis and thus the flow volume changes greatly.

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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)

Abstract

La présente invention concerne un injecteur de carburant servant à injecter du carburant dans la chambre de combustion d'un moteur à combustion interne, et comprenant un corps d'injecteur (2, 16) dans lequel est disposé un pointeau (5, 30, 40) de manière à pouvoir se déplacer. L'extrémité (12) du pointeau (5, 30, 40) referme ou ouvre une ouverture d'injection (15) débouchant sur la chambre de combustion. Le pointeau (5, 30, 40) comprend au moins une section de guidage (6, 7, 45). A la section de guidage (7, 45) du pointeau (5, 30, 40), située côté corps d'injecteur, est associée une zone de restriction (17).
PCT/DE2002/001163 2001-04-10 2002-03-30 Injecteur a action de restriction WO2002084109A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE50213943T DE50213943D1 (de) 2001-04-10 2002-03-30 Injektordüse mit drosselverhalten
EP02740226A EP1379776B1 (fr) 2001-04-10 2002-03-30 Injecteur a action de restriction

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2001117861 DE10117861A1 (de) 2001-04-10 2001-04-10 Injektordüse mit Drosselverhalten
DE10117861.1 2001-04-10

Publications (2)

Publication Number Publication Date
WO2002084109A2 true WO2002084109A2 (fr) 2002-10-24
WO2002084109A3 WO2002084109A3 (fr) 2002-12-12

Family

ID=7681076

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2002/001163 WO2002084109A2 (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)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1882845A1 (fr) * 2006-07-27 2008-01-30 MAGNETI MARELLI POWERTRAIN S.p.A. Injecteur de carburant pour un moteur à combustion interne à injection directe
WO2009017581A1 (fr) * 2007-07-31 2009-02-05 Caterpillar Inc. Buse d'injecteur de carburant avec dispositif de limitation d'écoulement
EP2568157A1 (fr) * 2011-09-08 2013-03-13 Delphi Technologies Holding S.à.r.l. Buse à injection

Families Citing this family (2)

* 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
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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19701879A1 (de) 1997-01-21 1998-07-23 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen
GB2335000A (en) 1998-03-05 1999-09-08 Lucas Ind Plc Fuel injector having a restricted fuel flow path provided by a needle valve

Family Cites Families (9)

* 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
US4987887A (en) * 1990-03-28 1991-01-29 Stanadyne Automotive Corp. Fuel injector method and apparatus
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
JPH11200999A (ja) * 1998-01-09 1999-07-27 Nissan Motor Co Ltd 内燃機関用燃料噴射弁
JP3704957B2 (ja) * 1998-07-06 2005-10-12 いすゞ自動車株式会社 インジェクタ
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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19701879A1 (de) 1997-01-21 1998-07-23 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen
GB2335000A (en) 1998-03-05 1999-09-08 Lucas Ind Plc Fuel injector having a restricted fuel flow path provided by a needle valve

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1882845A1 (fr) * 2006-07-27 2008-01-30 MAGNETI MARELLI POWERTRAIN S.p.A. Injecteur de carburant pour un moteur à combustion interne à injection directe
US7438054B2 (en) 2006-07-27 2008-10-21 Magneti Marelli Powertrain S.P.A. Fuel injector for a direct injection internal combustion engine
CN101113708B (zh) * 2006-07-27 2011-05-04 玛涅蒂玛瑞利动力系公开有限公司 用于直喷式内燃机的燃料喷射器
WO2009017581A1 (fr) * 2007-07-31 2009-02-05 Caterpillar Inc. Buse d'injecteur de carburant avec dispositif de limitation d'écoulement
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
WO2013034543A1 (fr) * 2011-09-08 2013-03-14 Delphi Technologies Holding S.À.R.L. Buse d'injection
CN103764998A (zh) * 2011-09-08 2014-04-30 德尔福技术控股有限公司 喷嘴
US9234487B2 (en) 2011-09-08 2016-01-12 Delphi International Operations Luxembourg S.A.R.L. Injection nozzle
CN103764998B (zh) * 2011-09-08 2016-09-14 德尔福国际运营卢森堡有限公司 喷嘴

Also Published As

Publication number Publication date
DE10117861A1 (de) 2002-10-24
EP1379776B1 (fr) 2009-10-21
EP1379776A2 (fr) 2004-01-14
DE50213943D1 (de) 2009-12-03
WO2002084109A3 (fr) 2002-12-12

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