WO2011063929A1 - Injecteur de carburant pour moteurs à combustion interne - Google Patents

Injecteur de carburant pour moteurs à combustion interne Download PDF

Info

Publication number
WO2011063929A1
WO2011063929A1 PCT/EP2010/007086 EP2010007086W WO2011063929A1 WO 2011063929 A1 WO2011063929 A1 WO 2011063929A1 EP 2010007086 W EP2010007086 W EP 2010007086W WO 2011063929 A1 WO2011063929 A1 WO 2011063929A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle needle
diameter
pressure chamber
nozzle
longitudinal bore
Prior art date
Application number
PCT/EP2010/007086
Other languages
German (de)
English (en)
Inventor
Gerhard Beier
Ilona Gostic
Robert Haubold
Michael Hekel
Axel LÖFFLER
Horst Ressel
Ralf SCHÜLE
Holmer Slocinski
Marco Wyszkowski
Original Assignee
L'orange 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 L'orange Gmbh filed Critical L'orange Gmbh
Priority to EP10781443.6A priority Critical patent/EP2504561B1/fr
Priority to KR1020127016522A priority patent/KR101682346B1/ko
Priority to DK10781443T priority patent/DK2504561T3/en
Priority to CN201080053591.9A priority patent/CN102725511B/zh
Publication of WO2011063929A1 publication Critical patent/WO2011063929A1/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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1893—Details of valve member ends not covered by groups F02M61/1866 - F02M61/188
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • 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

Definitions

  • the invention relates to a fuel injection nozzle for internal combustion engines, in particular self-igniting internal combustion engines, according to the preamble of claim 1.
  • DE 32 27 742 AI an injection nozzle, in which the guided with a shaft portion in a longitudinal bore of a guide body nozzle needle then to this
  • Shank portion has a reduced in diameter, cylindrical and the pressure chamber passing through shaft portion and the fuel supply to the pressure chamber is axially frontally. Also frontally to the pressure chamber of the guide body with a neck of the reduced diameter shaft portion to the guided shaft portion enclosing "ring collar" as a guide part for a supported on the guide body, the nozzle needle in the direction of its closed position axially acting coil spring is formed.
  • EP 1 026 393 A2 shows an injection nozzle with a control body connected to a nozzle body.
  • Nozzle body and control body are central provided with axially merging holes for the nozzle needle and a pressure piston which is located in the control body and is connected to the nozzle needle via a push rod.
  • the push rod passes through a pressure chamber on the circumferential side, ie radially from the outside, a fuel supply channel opens, in the axial transition region between the control body and nozzle body such that they open mutually open areas of the fuel supply channel and the pressure chamber, on whose the control body associated part the pressure piston receiving axial bore opens, in in the
  • the nozzle body is also formed with an expiring on the pressure chamber guide bore for the nozzle needle, which has a running in the guide bore shaft portion which merges incoming into the pressure chamber in a reduced diameter shaft portion.
  • a gap-like annular space opens out to the guide bore between the latter and the shaft of the nozzle needle and opens up against the pressure chamber. This serves to relieve at the pressure chamber at an acute angle to the nozzle needle and adjacent to this incoming fuel supply channel remaining between the guide bore and the fuel supply channel gusset region of the nozzle body that superimposed on the swelling pressure forces in the fuel supply channel starting from the pressure chamber in the gap-like annulus Counterforces can be built.
  • EP 0 961 024 A1 which shows a fuel injection nozzle for a two-stroke large diesel engine, and in which the fuel supply is controlled by two nozzles located one behind the other.
  • the nozzle needle of the second nozzle is stepped in diameter.
  • the larger diameter shaft portion of the nozzle needle is located in a guide bore and passes in the mouth region of the guide bore on the pressure chamber on the smaller diameter shaft portion.
  • corresponding fuel injection nozzles are known for example from DE 39 38 551 AI.
  • injection nozzles are prone to cavitation, especially when local pressure differences are formed.
  • a Vietnamesezu critical zone is the transition region of guided in the longitudinal bore of the nozzle body shaft portion of the nozzle needle on the reduced diameter, the pressure chamber passing through shaft portion.
  • the invention has for its object to provide a training for a fuel injector of the type mentioned, with the cavitation damage can be avoided in particular in the transition area of guided in the guide portion of the longitudinal bore shaft portion of the nozzle needle on the constricted shaft portion.
  • This reduction in cross-section is determined by the small, one third of the diameter of the longitudinal bore corresponding distance from the transition of the guide portion of the longitudinal bore on the pressure chamber to the adjacent end of the guided shaft portion of the nozzle needle and lying at 70 ° cone angle of the constricted shaft portion. Further, by the fuel supply to the pressure chamber in radial overlap to the waist of the constriction, as well as, in conjunction with the asymmetrical flow of the nozzle needle, a reduction in pressure differences in the pressure chamber can be achieved. Such a configuration can be realized without substantially reducing the length of the guided shaft portion or an extended nozzle structure
  • Fig. 1 shows a simplified representation of a cross section through a fuel injection nozzle
  • Fig. 2 in an enlarged view of the blind hole starting from the sidecut on the needle tip expiring portion of the shank of
  • the injection nozzle 1 has a nozzle body 2, which has a longitudinal bore 4 extending in the direction of its longitudinal axis 3 with sections of different diameters.
  • the longitudinal bore 4 receives a nozzle needle 5 and runs in the combustion chamber end of the nozzle body 2 provided injection openings 6.
  • the nozzle needle 5 has an optionally provided with microgrooves shaft portion 7, with which it is guided axially displaceably in a guide portion 8 of the longitudinal bore 4 of the nozzle body 2 in the direction of the longitudinal axis 3.
  • This guide section 8 opens onto an enlarged in diameter and formed as a pressure chamber 9 part of the longitudinal bore 4, to which a further portion 10 of the longitudinal bore 4 connects, which tapers via a bore-side seat 11 to the injection openings 6.
  • an axially extending fuel supply passage is designated, which opens radially to the pressure chamber 9, wherein the fuel supply in the exemplary embodiment via two mouth openings 13 takes place asymmetrically on the pressure chamber 9, which connects from a guided to the shaft portion 7 the and radially constricted shaft portion 14 of the nozzle needle 5 is penetrated.
  • the fuel supply in the exemplary embodiment via two mouth openings 13 takes place asymmetrically on the pressure chamber 9, which connects from a guided to the shaft portion 7 the and radially constricted shaft portion 14 of the nozzle needle 5 is penetrated.
  • At the over the course of the - longitudinal axis 3 extending constricted shank portion 14 includes another shaft portion 15, which is reduced in diameter relative to the shaft portion 7 and the periphery of the longitudinal bore 4 defines an annular space 16, on the
  • the nozzle needle 5 When the nozzle needle 5 is in the closed position, the fuel supply to the injection openings 6 is blocked by the abutting surfaces 11 and 18. If the nozzle needle 5 is lifted out of its seat, then fuel is injected via the injection openings 6 to the respective combustion chamber, when fuel is supplied via the mouth openings 13 to the pressure chamber 9 in the region of the waist 19 of the constricted shaft portion 14.
  • the waist 19 lies in radial Covering the mouth openings 13, which are arranged offset relative to the longitudinal axis 3 and circumferentially offset from each other with respect to the circumference of the pressure chamber 9, so that due to flow, at least over the peripheral region of the pressure chamber 9, resulting at different pressure levels areas.
  • the shaft section 7 guided in the longitudinal bore 4 of the nozzle body 2 ends at a distance from the mouth of the longitudinal bore 4 on the pressure chamber 9 which is radially widened in relation to the longitudinal bore 4, that is to say the transition between the in the longitudinal bore 4 guided shaft portion 7 and the purpose constricted shaft portion 14 before the junction of the guide portion 8 of the longitudinal bore 4, and thus within the guide portion 8 of the longitudinal bore 4.
  • the liquid ring forming in the annular space 20 is due to the gradual, pressure jumps avoiding or at least re Duplasticden cross-sectional transitions from the pressure chamber 9 on the annular gap between the shaft portion 7 and the guide portion 8 as a "guard ring" against the formation of Kavitationsbläschen in the transition to the annular gap and in the annular gap to understand the necessary even when opening the nozzle needle from the annular gap gas bubbles Free space for a possible implosion of the same in the remote area, so that cavitation damage to the nozzle shaft are at least largely avoided.
  • the distance 21 of the guided shaft Section 7 of the nozzle needle 5 from the transition of the longitudinal bore 4 of the nozzle body 2 to the pressure chamber 9 a fraction of the diameter 22 of the guide portion 8 of the nozzle body 2 corresponds.
  • a preferred size ratio is that the size of the distance 21 is one third of the diameter 22 of the longitudinal bore 3. This in conjunction with a cone angle 24 in the range of 70 °, so that there is a relatively flat cross-section of the triangular annular space 20.
  • a waist diameter 23 proves to be useful for the constricted shaft portion 14, which is greater than half the diameter of the lying in the nozzle body 2 guide portion of the longitudinal bore 4, and in particular at about two-thirds of the diameter 22 of the guide portion 8 of the longitudinal bore , And thus the diameter of the guided shaft portion 7 is located.
  • the needle-side sealing surface 18 corresponding to the seat surface 11 on the nozzle body 2 lies between a frusto-conical annular region 25 and the nozzle needle tip 17 adjoining the shaft section 15 and tapering towards the nozzle needle tip 17, wherein for the frusto-conical annular region 25, the annular sealing surface 18 and the nozzle needle tip 17, the respective cone angle 26 to 28 are indicated.
  • the supplied via the annular space 16 fuel is thus introduced in the amount of the annular region 25 via the nozzle body 2 and the seat 11 of the nozzle body 2 towards tapered annular gap, the annular gap between seat 11 and sealing surface 18 and the nozzle needle tip 17 in the blind hole, from the injection openings 6 go out.
  • the stepped transition for taking place via the annular space 16 fuel supply to the blind hole allows a good command of the flow conditions.

Landscapes

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

Abstract

Injecteur de carburant pour moteurs à combustion interne, notamment pour moteurs à auto-allumage, comportant une aiguille d'injecteur (5) dotée d'une partie tige (7) guidée dans un alésage longitudinal (4) du corps d'injecteur (2), cette partie tige se prolongeant par une partie tige (14) rétrécie qui traverse une chambre de pression (9), l'interface entre ces parties tiges se trouvant à l'intérieur de l'alésage longitudinal (4) à une certaine distance de son embouchure dans la chambre de pression (9).
PCT/EP2010/007086 2009-11-25 2010-11-23 Injecteur de carburant pour moteurs à combustion interne WO2011063929A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP10781443.6A EP2504561B1 (fr) 2009-11-25 2010-11-23 Injecteur de carburant pour moteurs à combustion interne
KR1020127016522A KR101682346B1 (ko) 2009-11-25 2010-11-23 내연 기관용 연료-분사 노즐
DK10781443T DK2504561T3 (en) 2009-11-25 2010-11-23 Fuel injection nozzle for burning power machines
CN201080053591.9A CN102725511B (zh) 2009-11-25 2010-11-23 用于内燃机的燃料喷射嘴

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009054441.0 2009-11-25
DE102009054441A DE102009054441A1 (de) 2009-11-25 2009-11-25 Kraftstoff-Einspritzdüse für Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
WO2011063929A1 true WO2011063929A1 (fr) 2011-06-03

Family

ID=43558366

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/007086 WO2011063929A1 (fr) 2009-11-25 2010-11-23 Injecteur de carburant pour moteurs à combustion interne

Country Status (6)

Country Link
EP (1) EP2504561B1 (fr)
KR (1) KR101682346B1 (fr)
CN (1) CN102725511B (fr)
DE (1) DE102009054441A1 (fr)
DK (1) DK2504561T3 (fr)
WO (1) WO2011063929A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2669504A1 (fr) 2012-05-30 2013-12-04 Caterpillar Motoren GmbH & Co. KG Piston pour pompe à carburant de moteur à combustion interne

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2711350A1 (de) * 1977-03-16 1978-09-21 Bosch Gmbh Robert Kraftstoffeinspritzduese fuer brennkraftmaschinen
JPS5813154A (ja) 1981-07-16 1983-01-25 Katsunobu Kano デイ−ゼルエンジンのインジエクシヨンノズル
DE3227742A1 (de) 1981-07-31 1983-05-11 Steyr-Daimler-Puch AG, 1010 Wien Kraftstoffeinspritzanlage fuer brennkraftmaschinen
DE3938551A1 (de) 1989-11-21 1991-05-23 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE19515936A1 (de) 1994-05-02 1995-11-09 Caterpillar Inc Verfahren und Vorrichtung zum Verringern von Kavitation und dynamischem Kraftungleichgewicht bei Hydraulikventilen
DE19611884A1 (de) 1996-03-26 1997-10-02 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
EP0961024A1 (fr) 1998-05-29 1999-12-01 Wärtsilä NSD Schweiz AG Buse d'injection de combustible
EP1026393A2 (fr) 1999-02-05 2000-08-09 Siemens Aktiengesellschaft Injecteur pour système d'injection de moteur à combustion interne

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1206632A (en) * 1967-05-23 1970-09-23 Cav Ltd Liquid fuel injection nozzle units
US3806041A (en) * 1972-04-24 1974-04-23 Stanadyne Inc Fuel injector
DE3937917A1 (de) * 1989-11-15 1991-05-16 Man Nutzfahrzeuge Ag Verfahren zum intermittierenden einspritzen von brennstoff in den brennraum einer brennkraftmaschine, sowie vorrichtung zur durchfuehrung dieses verfahrens
US4987887A (en) * 1990-03-28 1991-01-29 Stanadyne Automotive Corp. Fuel injector method and apparatus
DE10115215A1 (de) * 2001-03-28 2002-10-10 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
JP2005113889A (ja) * 2003-10-10 2005-04-28 Denso Corp 燃料噴射ノズル

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2711350A1 (de) * 1977-03-16 1978-09-21 Bosch Gmbh Robert Kraftstoffeinspritzduese fuer brennkraftmaschinen
JPS5813154A (ja) 1981-07-16 1983-01-25 Katsunobu Kano デイ−ゼルエンジンのインジエクシヨンノズル
DE3227742A1 (de) 1981-07-31 1983-05-11 Steyr-Daimler-Puch AG, 1010 Wien Kraftstoffeinspritzanlage fuer brennkraftmaschinen
DE3938551A1 (de) 1989-11-21 1991-05-23 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE19515936A1 (de) 1994-05-02 1995-11-09 Caterpillar Inc Verfahren und Vorrichtung zum Verringern von Kavitation und dynamischem Kraftungleichgewicht bei Hydraulikventilen
DE19611884A1 (de) 1996-03-26 1997-10-02 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
EP0961024A1 (fr) 1998-05-29 1999-12-01 Wärtsilä NSD Schweiz AG Buse d'injection de combustible
EP1026393A2 (fr) 1999-02-05 2000-08-09 Siemens Aktiengesellschaft Injecteur pour système d'injection de moteur à combustion interne

Also Published As

Publication number Publication date
CN102725511B (zh) 2015-10-07
CN102725511A (zh) 2012-10-10
DK2504561T3 (en) 2015-04-20
KR20120086738A (ko) 2012-08-03
EP2504561B1 (fr) 2015-01-14
EP2504561A1 (fr) 2012-10-03
KR101682346B1 (ko) 2016-12-05
DE102009054441A1 (de) 2011-06-30

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