EP2721283A1 - Injecteur de carburant pour un moteur à combustion interne - Google Patents

Injecteur de carburant pour un moteur à combustion interne

Info

Publication number
EP2721283A1
EP2721283A1 EP12723689.1A EP12723689A EP2721283A1 EP 2721283 A1 EP2721283 A1 EP 2721283A1 EP 12723689 A EP12723689 A EP 12723689A EP 2721283 A1 EP2721283 A1 EP 2721283A1
Authority
EP
European Patent Office
Prior art keywords
region
nozzle needle
fuel injector
fuel
flats
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Withdrawn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
EP12723689.1A
Other languages
German (de)
English (en)
Inventor
Holger Rapp
Johannes SCHILL
Joerg Hahn
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 EP2721283A1 publication Critical patent/EP2721283A1/fr
Withdrawn legal-status Critical Current

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
    • F02M61/04—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
    • 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

  • the invention relates to a fuel injector for an internal combustion engine according to the preamble of claim 1.
  • Flats in the form of polished allow a flow of fuel between the nozzle needle and the housing in the direction of the combustion chamber of the internal combustion engine associated injection ports.
  • a cylindrical region is arranged on the side facing the injection openings, in the direction of the nozzle needle facing away from the injection openings a section with a plurality of radially encircling grooves which, together with the webs delimiting the grooves, form annular gap throttling elements are. Since a nozzle needle in the valve housing is usually not rotationally fixed, a different angular position of the flattenings of the guides and the needle guide, based on the laterally opening into the high pressure area high-pressure inlet, a slightly different throttling at these passages or flattening result.
  • the flow below the guide may also have a circumferential angle dependence induced by the bevels.
  • maxima and minima of the flow velocity, relative to the injection holes can depend on the angle of rotation of the nozzle needle.
  • the present invention seeks to further develop a fuel injector for an internal combustion engine according to the preamble of claim 1 such that the fluctuation of the flow rates or injection quantities despite a rotation of the nozzle needle is relatively low.
  • a fuel injector for internal combustion engines with the features of claim 1 according to the invention that the area of the nozzle needle, which has a reduced cross section compared to the guide areas, viewed in the longitudinal direction between the two guide areas at least one point formed continuously with the reduced cross-section is.
  • the area reduced in cross-section between the guide areas it is proposed to form the area in a continuous cylindrical manner. As a result, this can be very easily and accurately produced, for example, by a grinding process. If one does not want to reduce the area reduced in cross-section too much with regard to the flow cross-section, it can also be provided that at least one residual area of a flattening reduced in height extends in the longitudinal direction of the area. In other words, this means that the entire flats at the guide regions during production of the nozzle needle are advantageously formed over a partial length of the nozzle needle, and that subsequently a locally limited diameter reduction, for example by a grinding process, is provided between the two guide regions.
  • the flats are offset in their angular position to each other.
  • a transverse flow can be generated, which counteracts the mentioned rotation of the nozzle needle.
  • the offset between the flats is 36072 n, where n is the number of flats.
  • the cross sections of the passages in the inlet and in the outlet area are of different sizes, such that the flow cross section in the outflow area is greater than in the inflow area.
  • FIG. 1 shows a partial region of a fuel injector for an internal combustion engine in a longitudinal section using a nozzle needle according to the prior art and Fig. 2
  • Fig. 1 is the combustion chamber of an internal combustion engine, not shown, lower end portion of a fuel! shown in the ejector 10, as it is known from the prior art.
  • the fuel injector 10 has a housing 1 1, which carries at its end facing the combustion chamber, a nozzle body 12 which is axially clamped by means of a nozzle retaining nut, not shown, with the housing 1 1.
  • a recess 13 is formed, in which a nozzle needle 1 in the direction of the double arrow 14 up and is movably guided.
  • the nozzle needle 1 is formed in FIG. 1 according to the prior art.
  • the nozzle body 12 has, at the end facing the combustion chamber of the internal combustion engine, a plurality of injection openings 15, via which fuel discharged under high pressure, in particular under rail pressure, is discharged into the combustion chamber of the internal combustion engine. This takes place in a raised position of the nozzle needle 1, in which it lifts off from its sealing seat formed between the inner wall of the nozzle body 12 and the nozzle needle tip, as shown in FIG.
  • the nozzle needle 1 has a plurality of diameter ranges.
  • two cylindrical regions 17 and 18 with approximately the same diameter are provided, between which there is a cylindrical region 19 with a larger diameter than the regions 17 and 18.
  • the diameter of the region 19 is in particular adapted to the inner diameter of the nozzle body 12 in order to allow a guidance of the nozzle needle 1 in the nozzle body 12.
  • Area 19 a plurality of flats formed by contours 21, which are preferably arranged at uniform angular intervals to each other, and extending in the longitudinal direction of the region 19.
  • the in the housing 1 1, the high-pressure chamber 20 forming recess 23 is bounded on the side facing away from the spray openings 15 side of a throttle plate 25, on the underside, an annular spring plate 26 is supported.
  • the spring plate 26 facing end portion 27 of the nozzle needle 1 dips into the opening of the spring plate 26 a. Between the top of the end portion 27 of the nozzle needle 1 and the spring plate 26 and the throttle plate 25 is a with
  • Fuel-filled control chamber 28 is formed, the pressure for controlling the upward and downward movement of the nozzle needle 1, as is known per se, is variable. Between the underside of the spring plate 26 and a diameter step 29 of the nozzle needle 1, a compression spring 30 is supported, which acts on the nozzle needle 1 in the direction of its sealing seat with spring force, so that it is prevented that fuel is discharged uncontrollably through the spray openings 15 into the combustion chamber.
  • the throttle plate 25 has, in particular, two through bores 31, 32, of which one is a through-bore 32, beyond which it is stationary under rail pressure
  • a first nozzle needle 100 according to the invention is shown, as it can be used in the fuel injector 10 instead of the nozzle needle 1.
  • the nozzle needle 100 has two axially spaced-apart guide regions 35, 36, of which the one guide region 35, which is located on the side facing away from the spray openings 15, has a greater length than the second guide region 36.
  • the two guide portions 35, 36 are respectively cylindrically shaped and have on their outer circumference in each case a plurality, for example three or four flats 37, 38, which are preferably arranged at uniform angular intervals from one another.
  • the flats 37, 38 are arranged in their angular position in alignment with each other, and in particular formed by a grinding process. Between the two, with the exception of the flats 37, 38 cylindrical guide portions 35, 36, it is provided according to the invention that a cylindrical portion 39 is formed, the diameter of which, for example, is approximately as large as the nozzle needle sections 41, 42, located on the the guide areas 35, 36 facing away from the area 39 are located.
  • nozzle needle 100 When used in the fuel injector 10 nozzle needle 100 thus has the cylindrical portion 39 has a larger passage cross-section for fuel than the two guide portions 35, 36, in which the flow of fuel substantially exclusively in the region of the flats 37, 38 takes place, if a radial Disregard guide game between the guide portions 35, 36 and the wall of the nozzle body 12.
  • the over the guide portions 35, 36 enlarged flow cross section in the area 39 for the fuel is over the entire axial extent or in the longitudinal direction of the
  • Area 39 formed, that is, at each point of the area 39, viewed in the longitudinal direction, the flow area is greater than in the guide portions 35, 36th
  • the nozzle needle 100a shown in FIG. 3 differs from the nozzle needle 100 according to FIG. 2 in that the cylindrical area 39a has a larger diameter than the area 39, so that a remainder of a distance Flattening 43 can be seen, which is created by the fact that when forming the flats 37a, 38a was processed by means of a grinding tool, the entire length range between the flats 37a and 38a. Also in the case of the nozzle needle 100a, the region 39a has a larger flow cross-section over the entire length than in the region of the flats 37a, 38a.
  • the nozzle needle 100b shown in FIG. 4 differs from the nozzle needle 100 according to FIG. 2 on the one hand in that a web-shaped circumferential region 44 is formed in the nozzle needle section 42b, which in particular corresponds to the axial contact of the device shown in FIG can serve 30 shown.
  • the flats 37b, 38b are arranged offset to one another at the nozzle needle 100b in their angular position. It is preferably provided that the angular offset between the flats 37b, 38b 36072 ⁇ , where n is the number of flats 37b, 38b means.
  • the nozzle needle 100b has a different number of flats 37b, 38b. This may inter alia result in that the flow cross section for fuel in the region of the flats 37b, 38b is different, wherein it is preferably provided that the flow cross section of the spray openings 15 facing flats 38b is greater than the flow cross section in the region of the flats 37b.
  • jet needles 100, 100a and 100b described so far can be modified or modified in many ways without departing from the spirit of the invention. This is to form between the guide portions 35, 36 of a nozzle needle 100, 100a, 100b, a region 39, 39a, the flow cross-section for fuel is greater than the flow area in the region of the guide portions 35, 36, wherein the region 39, 39a in the longitudinal direction Nozzle needle 100, 100a, 100b seen at least at one point is provided throughout with the enlarged flow cross-section.

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

L'invention concerne un injecteur de carburant (10) pour moteurs à combustion interne, comprenant une aiguille d'injecteur (100; 100a; 100b) qui est disposée de manière axialement déplaçable dans un carter (11) et qui présente deux zones de guidage (35; 35b, 36; 36b) axialement espacées l'une de l'autre. Des passages formés par des aplatissements (37; 37a; 37b, 38; 38a; 38b) dans la région des zones de guidage (35; 35b, 36; 36b) sont formés dans le carter (11) pour du carburant sous haute pression provenant d'une région d'amenée de carburant (32) en direction d'ouvertures d'injection (15) et l'aiguille d'injecteur (100; 100a; 100b) présente entre les zones de guidage (35; 35b, 36; 36b) une région (39; 39a) ayant une aire de section transversale réduite par rapport aux zones de guidage (35; 35b, 36; 36b). Selon l'invention, la région (39; 39a), vue dans la direction longitudinale de l'aiguille d'injecteur (100; 100a; 100b), est conçue de manière constante avec une aire de section transversale réduite à au moins un endroit entre les deux zones de guidage (35; 35b, 36; 36b).
EP12723689.1A 2011-06-14 2012-05-25 Injecteur de carburant pour un moteur à combustion interne Withdrawn EP2721283A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110077464 DE102011077464A1 (de) 2011-06-14 2011-06-14 Kraftstoffinjektor für eine Brennkraftmaschine
PCT/EP2012/059807 WO2012171770A1 (fr) 2011-06-14 2012-05-25 Injecteur de carburant pour un moteur à combustion interne

Publications (1)

Publication Number Publication Date
EP2721283A1 true EP2721283A1 (fr) 2014-04-23

Family

ID=46168488

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12723689.1A Withdrawn EP2721283A1 (fr) 2011-06-14 2012-05-25 Injecteur de carburant pour un moteur à combustion interne

Country Status (3)

Country Link
EP (1) EP2721283A1 (fr)
DE (1) DE102011077464A1 (fr)
WO (1) WO2012171770A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2927473B1 (fr) * 2014-04-03 2017-09-20 Continental Automotive GmbH Soupape d'injection de carburant pour moteurs à combustion interne

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3225180A1 (de) * 1982-07-06 1984-01-12 Robert Bosch Gmbh, 7000 Stuttgart Einspritzventil
DE10024702A1 (de) * 2000-05-18 2001-11-22 Bosch Gmbh Robert Einspritzanordnung für ein Kraftstoff-Speichereinspritzsystem einer Verbrennungsmaschine
DE102009000206A1 (de) 2009-01-14 2010-07-15 Robert Bosch Gmbh Kraftstoffinjektor für Brennkraftmaschinen
DE102009046452A1 (de) * 2009-11-06 2011-05-12 Robert Bosch Gmbh Einspritzdüse für einen lecklosen Kraftstoffinjektor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012171770A1 *

Also Published As

Publication number Publication date
DE102011077464A1 (de) 2012-12-20
WO2012171770A1 (fr) 2012-12-20

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