[go: up one dir, main page]

EP1857668A1 - Injecteur de carburant doté d'un double guide d'aiguille - Google Patents

Injecteur de carburant doté d'un double guide d'aiguille Download PDF

Info

Publication number
EP1857668A1
EP1857668A1 EP07107829A EP07107829A EP1857668A1 EP 1857668 A1 EP1857668 A1 EP 1857668A1 EP 07107829 A EP07107829 A EP 07107829A EP 07107829 A EP07107829 A EP 07107829A EP 1857668 A1 EP1857668 A1 EP 1857668A1
Authority
EP
European Patent Office
Prior art keywords
guide
valve member
injection
injection valve
lower housing
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.)
Withdrawn
Application number
EP07107829A
Other languages
German (de)
English (en)
Inventor
Wilfried Roth
Otto Halama
Michael Braun
Peter Nepf
Rainer Kohlbauer
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 EP1857668A1 publication Critical patent/EP1857668A1/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • F02M61/04—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
    • 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

Definitions

  • the invention relates to an injector for injecting fuel into a combustion chamber of an internal combustion engine according to the preamble of claim 1.
  • the injection valve member is guided in a first guide, which is formed on the side of the injection valve member facing away from the injection openings. The axial extent of this guide is much longer than the diameter of the injection valve member.
  • the injection valve member is guided in a second guide whose length corresponds approximately to the diameter of the injection valve member.
  • the task of this guide is not only the leadership of the injection valve member, but the metering of a predetermined amount of fuel for injection into the combustion chamber of the internal combustion engine.
  • An inventively designed injector for injecting fuel into a combustion chamber of an internal combustion engine comprises an injection valve member, which at least an injection port opens or closes and which is guided in two guides in a housing of the injector.
  • a guide is arranged on the side of the housing facing the at least one injection opening and the second guide is arranged on the side of the housing facing away from the at least one injection opening.
  • the ratio of the length of the guide, which is arranged on the side facing away from the at least one injection port, based on the diameter of the guide is in the range of 0.5 to 2, and the ratio of the length of the guide, which on the at least one injection port facing side, based on the diameter of the guide in the range of 0.25 to 1.
  • the ratio of the length of the guide, which is arranged on the side facing away from the at least one injection port side, based on the diameter of the guide in the range of 0.5 to 1.
  • the ratio of the length of the guide, on the at least one injection port facing side, based on the diameter is preferably in the range of 0.5 to 0.75.
  • the injection valve member guides By arranged at the respective opposite ends of the injection valve member guides, the length of which is smaller than the diameter of the injection valve member, an improved guidance of the injection valve member in comparison to the leadership of the injection valve member, as is known from the prior art.
  • the inclination of the injection valve member d. H. the desaxation, minimized in the nozzle seat. This minimization takes place both in the static and in the dynamic state.
  • the static state occurs at standstill of the internal combustion engine and the dynamic state during operation of the internal combustion engine.
  • the injection valve member At standstill of the internal combustion engine, the injection valve member is in its seat, so as to close the at least one injection port through which the fuel is injected into the combustion chamber while the internal combustion engine is running.
  • the injection valve member lifts in accordance with the rotational speed of the internal combustion engine in order to supply the required fuel to the combustion chamber.
  • the injector opens in the form of a step retreat from the valve seat to the first guide.
  • the first tour joins directly to the step retreat.
  • the ratio of the distance between the seat, in which the injection valve member can be made to close the at least one injection port, and the guide, which is arranged on the at least one injection port side facing the Einspritzventilgliedes, based on the diameter of the guide, is located preferably in the range of 0 to 2. In particular, the ratio of the distance to the diameter of the guide is in the range of 1 to 1.5.
  • the ratio of the distance between the guides based on the diameter of the guide is preferably in the range of 2 to 5, in particular in the range of 3.25 to 3.75.
  • high-pressure fuel is injected into the combustion chamber of the internal combustion engine.
  • This is provided in a pressure chamber, which is formed between the guide of the injection valve member, which is formed on the at least one injection port side facing the injection valve member, and the seat of the injection valve member.
  • free surfaces are formed on the injection valve member in the region of the guides.
  • the fuel flows into the pressure chamber along the open spaces.
  • ribs are formed in the injector housing for guiding the injection valve member.
  • the ribs can z. B. extend in the axial direction or helically in the injector. The fuel can then flow in the spaces between the individual ribs in the direction of the pressure chamber. In this case, it is not necessary to form free spaces on the injection valve member.
  • Figure 1 shows a lower housing portion of a fuel injector according to the prior art.
  • a lower housing portion of a fuel injector comprises a lower housing part 1, in which a first guide 3 and a second guide 5 are formed for an injection valve member, not shown here.
  • the first guide 3 is formed on the side facing at least one injection port 7.
  • the second guide 5 is arranged on the side facing away from the at least one injection opening 7. According to the embodiment as known from the prior art, the second guide 5 is made in a large length compared to the diameter of the injection valve member. The comparatively long length of the second guide 5 requires a high-precision manufacturing in order to avoid a demaxation of the injection valve member.
  • first undercut 9 is formed between the first guide 3 and the second guide 5, a first undercut 9 is formed.
  • the length of the first undercut 9, here denoted by reference numeral 11, corresponds essentially to the length of the second guide 5, which is designated here by reference numeral 13.
  • a second relief groove 17 is formed in the area between a valve seat 15, in which the injection valve member is placed to close the at least one injection port 7, and the first guide 3.
  • the position of the first guide 3 relatively close to the second guide 5 results in a large distance 19 between the first guide 3 and the valve seat 15. It follows that the injection valve member over a long range between the first guide 3 and the valve seat 15 is not performed. In this area, it can lead to a Desaxtechnik and thus improper opening and closing of the injection valve member.
  • FIG. 2 shows a lower section of a fuel injector formed according to the invention.
  • the latter comprises a lower housing part 1.
  • a first guide 21 and a second guide 23 are formed in the lower housing part 1.
  • injection valve member is guided.
  • the first guide 21 and the second guide 23 are made shorter.
  • the length of the first guide 21 is denoted by reference numeral 25 and the diameter of the first guide 21 by reference numeral 27.
  • the ratio of length 25 of the first guide 21 to the diameter 27 of the first guide 21 is in the range of 0.25 to 1.
  • the ratio is in the range of 0.5 to 0.75.
  • the length of the second guide 23 is designated.
  • the ratio of the length 29 of the second guide 23 to the diameter 31 of the second guide 23 is according to the invention in the range of 0.5 to 2.
  • the ratio of length of the second guide 23 to the diameter the second guide 23 in the range of 0.5 to 1.
  • the diameter 27 of the first guide 21 and the diameter 31 of the second guide 23 are the same size.
  • the first guide 21 is placed closer to the valve seat 15 than is the case with a fuel injector according to the prior art. Due to the more constant jet formation of the fuel through the injection opening 7 into the combustion chamber of the internal combustion engine, a more uniform combustion of the fuel and thus also a lower emission takes place.
  • a reduction in wear on the second guide 23 results from the fact that the distance between the first guide 21 and the second guide 23, which is formed by an undercut 35 between the first guide 21 and the second guide 23, is greater than the length 11 of first undercut 9 according to the prior art. As a result, a longer path is available, on which the injection valve member can be aligned. As a result, lower radial forces act on the second guide 23.
  • a second relief groove 37 is formed between the first guide 21 and the valve seat 15.
  • the second undercut 37 is required in order to be able to produce the first guide 21 within the given tolerances by grinding.
  • Figure 3 shows an inventively designed lower housing portion of a fuel injector in a second embodiment.
  • the embodiment shown in Figure 3 differs from the embodiment shown in Figure 2 by the position of the first guide 21.
  • the lower housing part 1 opens from the valve seat 15 in the form of a stepped retraction 38 to the first guide 21 out. Due to the step retreat 38, it is not necessary to form the second undercut 37. For this reason, the first guide 21 can be formed closer to the valve seat 15 than in the embodiment shown in Figure 2.
  • the ratio of the length 25 of the first guide 21 to the diameter 27 of the first guide 21 is also in the embodiment shown in Figure 3 in the range of 0.25 to 1, preferably in the range of 0.5 to 0.75.
  • the position of the second guide 23 and the ratio of the length 29 to the diameter 31 of the second guide 23 corresponds to the embodiment shown in FIG.
  • FIG. 4 shows a lower housing section of a fuel injector with an injection valve member guided therein.
  • the lower housing part 1 is constructed as shown in FIG.
  • the injection valve member 39 is provided with a sealing edge 41 in the valve seat 15 and thus closes the at least one injection port 7.
  • the second undercut 37 is part of a nozzle chamber 43, the between the first guide 21 and the valve seat 15 is formed.
  • In the nozzle chamber 43 is at a closed injection port 7 under system pressure standing fuel.
  • the injection member 39 lifts out of the valve seat 15 with the sealing edge 41 and thus releases the at least one injection opening 7, the fuel under system pressure in the nozzle chamber 41 flows through the at least one injection opening 7 into the combustion chamber of the internal combustion engine.
  • the peg-shaped extension 49 on the injection valve member 39 serves to stabilize a spring element, not shown here, which surrounds the peg-shaped extension 49. By the peg-shaped extension 49 is avoided that the spring element, not shown here, kinks by the pressure force exerted thereon.
  • the spring element is generally designed as a compression spring coil spring.
  • the length of the undercut 35 is designated here by reference numeral 51.
  • the length 51 of the undercut 35 is preferably selected such that the ratio of the length 51 of the undercut 35 relative to the diameter 27 of the first guide 21 is in the range of 2 to 5.
  • the ratio of the length 51 of the undercut 35 relative to the diameter 27 of the first guide 21 is in the range of 3.25 to 3.75.
  • the lower housing part 1 in the region of the guides 21 and 23 form ribs in which the injection valve member 39 is guided.
  • the ribs are preferably aligned in the axial direction.
  • the ribs z. B. helical, such as a thread, in the lower housing part 1 form. If the guides 21 and 23 are formed in the form of ribs, it is not necessary to provide the free surfaces 45 on the injection valve member 39, since the fuel then between the ribs of the guides from the spring chamber 47 in the annulus formed by the undercut 35 and from there into can flow the nozzle chamber 43.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP07107829A 2006-05-17 2007-05-09 Injecteur de carburant doté d'un double guide d'aiguille Withdrawn EP1857668A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200620007883 DE202006007883U1 (de) 2006-05-17 2006-05-17 Kraftstoffinjektor mit doppelter Nadelführung

Publications (1)

Publication Number Publication Date
EP1857668A1 true EP1857668A1 (fr) 2007-11-21

Family

ID=37311481

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07107829A Withdrawn EP1857668A1 (fr) 2006-05-17 2007-05-09 Injecteur de carburant doté d'un double guide d'aiguille

Country Status (2)

Country Link
EP (1) EP1857668A1 (fr)
DE (1) DE202006007883U1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009029542A1 (de) * 2009-08-28 2011-03-03 Robert Bosch Gmbh Kraftstoffeinspritzventil
DE102009028993A1 (de) * 2009-08-28 2011-03-03 Robert Bosch Gmbh Kraftstoffinjektor
DE102013212142A1 (de) * 2013-06-25 2015-01-08 Robert Bosch Gmbh Düsenbaugruppe für einen Kraftstoffinjektor sowie Kraftstoffinjektor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01138365A (ja) * 1987-11-23 1989-05-31 Nippon Denso Co Ltd 内燃機関用電磁式燃料噴射弁
DE4205744A1 (de) * 1991-02-26 1992-08-27 Nissan Motor Brennkraftmaschinen-brennstoffeinspritzduese
DE4128821A1 (de) * 1991-08-30 1993-03-04 Bosch Gmbh Robert Elektromagnetisch betaetigbares einspritzventil
DE69104525T2 (de) 1990-03-28 1995-03-02 Stanadyne Automotive Corp Kraftstoffeinspritzdüse.
EP1321661A2 (fr) * 2001-12-22 2003-06-25 Robert Bosch Gmbh Soupape d'injection de combustible pour moteurs à combustion interne

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01138365A (ja) * 1987-11-23 1989-05-31 Nippon Denso Co Ltd 内燃機関用電磁式燃料噴射弁
DE69104525T2 (de) 1990-03-28 1995-03-02 Stanadyne Automotive Corp Kraftstoffeinspritzdüse.
DE4205744A1 (de) * 1991-02-26 1992-08-27 Nissan Motor Brennkraftmaschinen-brennstoffeinspritzduese
DE4128821A1 (de) * 1991-08-30 1993-03-04 Bosch Gmbh Robert Elektromagnetisch betaetigbares einspritzventil
EP1321661A2 (fr) * 2001-12-22 2003-06-25 Robert Bosch Gmbh Soupape d'injection de combustible pour moteurs à combustion interne

Also Published As

Publication number Publication date
DE202006007883U1 (de) 2006-10-19

Similar Documents

Publication Publication Date Title
DE69918902T2 (de) Brennstoffinjektor
EP2812559B1 (fr) Injecteur de carburant et dispositif d'injection de carburant
EP2129903B1 (fr) Injecteur de carburant doté d'un étranglement de sortie supplémentaire ou doté d'une disposition améliorée de ce dernier dans la soupape de commande
WO1999030028A1 (fr) Injecteur de carburant pour moteurs a combustion interne a auto-allumage
WO2018082855A1 (fr) Injecteur de carburant pour injecter un carburant gazeux et/ou liquide
DE10122256A1 (de) Kraftstoff-Einspritzvorrichtung für Brennkraftmaschinen, insbesondere Common-Rail-Injektor, sowie Kraftstoffsystem und Brennkraftmaschine
DE19946766C2 (de) Injektor für eine Brennkraftmaschine mit Direkteinspritzung
WO2009092484A1 (fr) Injecteur de carburant
DE10100390A1 (de) Einspritzventil
EP1346143A1 (fr) Soupape d'injection de carburant destinee a des moteurs a combustion interne
DE3113475A1 (de) "kraftstoffeinspritzduese"
EP2310662A1 (fr) Injecteur de combustible
EP1857668A1 (fr) Injecteur de carburant doté d'un double guide d'aiguille
EP1541859B1 (fr) Injecteur
EP1527272B1 (fr) Injecteur de carburant comprenant une zone de raccordement resistant a haute pression
WO2003004861A1 (fr) Injecteur de carburant a soupape de commande a equilibrage des forces
DE102004010759A1 (de) Common-Rail Injektor
EP1526274A1 (fr) Dispositif d'injection de carburant, en particulier pour un moteur à combustion interne à injection directe
DE19929881A1 (de) Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19623581A1 (de) Kraftstoffeinspritzventil für Brennkraftmaschinen
EP2439398A1 (fr) Soupape d'injection de combustible
EP1379776A2 (fr) Injecteur a action de restriction
DE10148350A1 (de) Kraftstoff-Einspritzvorrichtung, insbesondere Injektor für Brennkraftmaschinen mit Direkteinspritzung, sowie Kraftstoffsystem und Brennkraftmaschine
DE102018221604A1 (de) Kraftstoffinjektor
DE10164395A1 (de) Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK YU

17P Request for examination filed

Effective date: 20080521

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

17Q First examination report despatched

Effective date: 20080710

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20081121