EP1358403A1 - Soupape d'injection de carburant pour moteur a combustion interne - Google Patents

Soupape d'injection de carburant pour moteur a combustion interne

Info

Publication number
EP1358403A1
EP1358403A1 EP02708210A EP02708210A EP1358403A1 EP 1358403 A1 EP1358403 A1 EP 1358403A1 EP 02708210 A EP02708210 A EP 02708210A EP 02708210 A EP02708210 A EP 02708210A EP 1358403 A1 EP1358403 A1 EP 1358403A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
nozzle needle
seat
gap
needle
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.)
Ceased
Application number
EP02708210A
Other languages
German (de)
English (en)
Inventor
Eberhard Kull
Hakan Yalcin
Wendelin KLÜGL
Andreas Fath
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP1358403A1 publication Critical patent/EP1358403A1/fr
Ceased 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
    • F02M61/16—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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/304—Fuel-injection apparatus having mechanical parts, the movement of which is damped using hydraulic means

Definitions

  • the present invention relates to a fuel injection valve according to the preamble of claim 1.
  • a fuel injection valve is known from WO 96/19661, which has a nozzle body with a central guide bore in which a nozzle needle is guided. An axial movement of the nozzle needle opens the valve, which is formed by a sealing edge on the nozzle needle seat of the nozzle needle and a conical nozzle body seat on the nozzle tip of the nozzle body. The nozzle needle seat and the nozzle body seat thus work together and form a sealing seat.
  • Valve controls the fuel flow to the injection holes that are made in the nozzle tip.
  • the sealing edge of the nozzle needle hits the conical nozzle body seat violently, which causes strong mechanical stress on the nozzle body, which can lead to a reduced service life of the nozzle body.
  • a shoulder in the form of a circumferential groove is introduced below the sealing edge of the nozzle needle in the sealing seat in order to prevent the nozzle body seat diameter from changing due to wear.
  • the tightness of the injection valve is particularly important to ensure in common-rail injection systems, since, in contrast to periodic injection, they are permanently under the peak pressure of the system, so that leaks would lead to continuous injection.
  • a free space is provided between the front free end of the nozzle needle and an inner wall of the nozzle body.
  • the pre-injection of a very small amount of fuel before the actual main injection improves the combustion process with regard to noise and exhaust gas behavior in such systems. Due to the small fuel density, the nozzle needle lifts very little from its seat in the nozzle body during pre-injection. Centering errors therefore have a particularly strong effect on the jet formation of the injected fuel and the course of the combustion.
  • the object of the invention is to create a fuel injection valve in which, on the one hand, the mechanical stress on the nozzle body is reduced and, on the other hand, improved jet formation can be achieved.
  • a gap is provided in the fuel injection valve according to the invention, which is arranged axially at a height between the sealing seat and a nozzle needle shaft in a closed state of the valve.
  • the nozzle needle has a truncated cone-shaped body section, along the longitudinal extent of which the gap extends at least in sections.
  • the needle needle seat is provided for the frustoconical body section of the nozzle needle, which, when the valve is closed, forms the sealing seat together with a conical nozzle body seat of a nozzle tip of a nozzle body.
  • the gap extending from the sealing seat in the direction of the nozzle needle shaft is designed such that in the region of the gap an outer surface of the frustoconical body section of the nozzle needle runs essentially parallel to an opposite inner surface of the nozzle body.
  • the fuel accumulated in the gap above the sealing seat when the valve closes hydraulically dampens the impact energy of the nozzle needle in the nozzle body seat, so that the mechanical stress on the nozzle body and consequent seat wear are reduced. Accordingly, the gap dampens the closing process in the area above the sealing seat.
  • the nozzle needle is hydraulically guided by the fuel flowing into the gap when closing. This ensures precise centering of the nozzle needle in the nozzle body, since the fuel in the gap exerts a compressive force on the nozzle needle that is uniformly distributed along the outer surface of the nozzle needle. This hydraulic guidance of the nozzle needle enables the injection holes to be evenly supplied with fuel. This ensures improved jet formation of the fuel injected through the injection holes into the combustion chamber of the internal combustion engine.
  • the gap is formed as an elongate recess in the outer surface of the nozzle needle and / or the inner surface of the nozzle body. Such a recess is simple and precise to manufacture.
  • the circumferential gap directly adjoins a sealing edge of the nozzle needle seat.
  • a damage volume below the sealing seat is kept low, so that hydrocarbon emission values are reduced.
  • the sealing edge is preferably provided on a circumferential cylindrical needle section between a nozzle needle tip and a frustoconical body section of the nozzle needle.
  • the cylindrical needle section forms a circumferential shoulder above the sealing edge on the outer surface of the nozzle needle.
  • the conical surface areas of the conical nozzle needle tip and the frustoconical body section of the nozzle needle preferably each have essentially the same cone angle. If the cylindrical needle section is provided between the nozzle needle tip and the frustoconical body section, this can ensure that the outer surface of the nozzle needle in the area of the gap is substantially parallel to the inner surface of the nozzle body runs in the area of the gap.
  • FIG. 1 shows a longitudinal section of a first embodiment of the fuel injection valve according to the invention with a detail X;
  • FIG. 2 shows the detail X from FIG. 1 in an enlarged illustration with a further detail Y;
  • Fig. 3 shows the detail Y of Figure 2 in an enlarged view.
  • Fig. 4 shows a detail of a second embodiment of the fuel injection valve according to the invention.
  • FIG. 1 shows a nozzle needle 2 with a nozzle needle guide 4 and a nozzle needle shaft 6, which is sealingly guided in a nozzle body 8.
  • a nozzle needle tip 10 This is designated as detail X and is shown enlarged in FIG. 2. It has a nozzle needle seat 12 with a sealing edge 14 which is fixed by a circumferential cylindrical needle section 16.
  • the nozzle needle seat 12 and a nozzle body seat 18 arranged on the nozzle body 8 cooperate when the fuel injection valve is sealed and form the valve.
  • the fuel injection valve is shown in the closed state, in which the sealing edge 14 together with the conical nozzle body seat 18 provides a sealing seat 20.
  • the valve controls the fuel inflow to injection holes 22, which are arranged below the sealing seat 20 in the direction of the nozzle needle tip 10.
  • a frustoconical body section 24 of the nozzle needle 2 can be seen in a region between the sealing seat 20 and the nozzle needle shaft 6, the cylindrical needle section 16 being formed at a transition between the nozzle needle tip 10 and the frustoconical body section 24.
  • a gap 28 is arranged between a section of an inner surface 26 of the nozzle body 8 and an opposite section of an outer surface of the frustoconical body section 24 of the nozzle needle 2, which acts as a pinch gap. This is shown as detail Y and in an enlarged representation in FIG. 3.
  • the outer surface 25 of the nozzle needle 2 runs essentially parallel to the inner surface 26 of the nozzle body 8, so that the gap 28 is formed between the body portion 24 of the nozzle needle and a portion of the inner surface 26 of the nozzle body 8.
  • the outer surface of the nozzle needle 2 has essentially the same cone angle as the outer surface of the conical nozzle needle tip
  • the gap 28 extends from the sealing seat 20 along a predetermined region of the body portion 24 of the nozzle needle 2 in the direction of the nozzle needle shaft 6. Thus, the gap 28 is provided above the sealing seat 20 on the nozzle needle 2.
  • the cylindrical needle section 16 forms a circumferential shoulder in the outer surface 25 of the nozzle needle 2, which closes the gap 28, in the illustrated closed state of the valve, at its lower end.
  • the fuel pressed into the gap 28 exerts a uniform compressive force on the nozzle needle 2 along the outer surface 25 of the nozzle needle 2.
  • the jet formation of the injected fuel improves considerably.
  • the gap 28 is introduced into the nozzle body 8.
  • the gap 28 is designed as an elongated recess in the nozzle body 8. The fuel flows in the direction of arrows P into the upper end of the circumferential recess and, when the valve is closed, becomes in the gap 28 between the outer surface of the truncated cone
  • the preferred maximum distance in the gap 28 between the outer surface 25 of the nozzle needle 2 and the inner surface 26 of the nozzle body 8 is in the range from 5 to 30 ⁇ m.

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 une soupape d'injection de carburant qui comprend un corps d'injecteur (8), pourvu d'un siège d'injecteur (18), ainsi qu'un pointeau d'injecteur (2) qui est guidé, de façon étanche, dans le corps d'injecteur (8) et qui comprend une tige de pointeau d'injecteur (6) et un siège de pointeau d'injecteur (12). Le siège de corps d'injecteur (18) et le siège de pointeau d'injecteur (12) créent ensemble une zone étanche (20). En hauteur, entre la zone étanche (20) et la tige de pointeau d'injecteur (6) se trouve un interstice (28). Dans la zone de cet interstice (28), une surface extérieure (25) du pointeau d'injecteur (2) s'étend sensiblement de façon parallèle à une surface intérieure (26) du corps d'injecteur (8).
EP02708210A 2001-02-08 2002-02-05 Soupape d'injection de carburant pour moteur a combustion interne Ceased EP1358403A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10105681 2001-02-08
DE10105681A DE10105681A1 (de) 2001-02-08 2001-02-08 Kraftstoffeinspritzventil für eine Brennkraftmaschine
PCT/DE2002/000417 WO2002063160A1 (fr) 2001-02-08 2002-02-05 Soupape d'injection de carburant pour moteur a combustion interne

Publications (1)

Publication Number Publication Date
EP1358403A1 true EP1358403A1 (fr) 2003-11-05

Family

ID=7673255

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02708210A Ceased EP1358403A1 (fr) 2001-02-08 2002-02-05 Soupape d'injection de carburant pour moteur a combustion interne

Country Status (4)

Country Link
US (1) US20040056119A1 (fr)
EP (1) EP1358403A1 (fr)
DE (1) DE10105681A1 (fr)
WO (1) WO2002063160A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10259169A1 (de) * 2002-12-18 2004-07-01 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschine
WO2016121475A1 (fr) * 2015-01-30 2016-08-04 日立オートモティブシステムズ株式会社 Robinet d'injection de carburant

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR791105A (fr) * 1934-07-04 1935-12-04 Siemens Ag Dispositif d'injection pour moteurs diesel à injection préalable et injection principale
JPS5882068A (ja) * 1981-11-09 1983-05-17 Nissan Motor Co Ltd 燃料噴射ノズル
JPS5882069A (ja) * 1981-11-09 1983-05-17 Nissan Motor Co Ltd 燃料噴射ノズル
DE3624476A1 (de) * 1986-07-19 1988-01-28 Bosch Gmbh Robert Einspritzventil
DE3624477A1 (de) * 1986-07-19 1988-01-28 Bosch Gmbh Robert Einspritzventil
GB9425652D0 (en) 1994-12-20 1995-02-22 Lucas Ind Plc Fuel injection nozzle
DE19634933B4 (de) * 1996-08-29 2007-06-06 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
US5899389A (en) * 1997-06-02 1999-05-04 Cummins Engine Company, Inc. Two stage fuel injector nozzle assembly
DE19755057A1 (de) * 1997-12-11 1999-06-17 Bosch Gmbh Robert Kraftstoffeinspritzdüse für selbstzündende Brennkraftmaschinen
DE19901057A1 (de) * 1999-01-14 2000-07-27 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02063160A1 *

Also Published As

Publication number Publication date
DE10105681A1 (de) 2002-08-29
US20040056119A1 (en) 2004-03-25
WO2002063160A1 (fr) 2002-08-15

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