WO2003081019A1 - Soupape d'injection de carburant pour moteurs a combustion interne - Google Patents

Soupape d'injection de carburant pour moteurs a combustion interne Download PDF

Info

Publication number
WO2003081019A1
WO2003081019A1 PCT/DE2003/000695 DE0300695W WO03081019A1 WO 2003081019 A1 WO2003081019 A1 WO 2003081019A1 DE 0300695 W DE0300695 W DE 0300695W WO 03081019 A1 WO03081019 A1 WO 03081019A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
valve needle
needle
hollow
fuel injection
Prior art date
Application number
PCT/DE2003/000695
Other languages
German (de)
English (en)
Inventor
Thomas Kuegler
Predrag Nunic
Detlev Potz
Original Assignee
Robert Bosch Gmbh
SANDER-POTZ, Maike
Potz, Wendelin
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, SANDER-POTZ, Maike, Potz, Wendelin filed Critical Robert Bosch Gmbh
Publication of WO2003081019A1 publication Critical patent/WO2003081019A1/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
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/086—Having more than one injection-valve controlling discharge orifices
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies

Definitions

  • the invention is based on a fuel injection valve for internal combustion engines according to the preamble of claim 1.
  • a fuel injection valve for example from DE-OS 27 11 391 and comprises a valve body in which a hollow valve needle and a longitudinally displaceable valve needle are arranged in a bore.
  • the hollow valve needle At its end on the combustion chamber side, the hollow valve needle has a valve sealing surface with which it interacts with a valve seat formed in the valve body.
  • the valve needle has a valve sealing surface on its combustion chamber end, which cooperates with the same valve seat.
  • the valve needle is guided at least over part of its length in the hollow valve needle, so that it maintains a defined position with respect to the valve seat.
  • Several injection openings usually exit from the valve seat and open into the combustion chamber of the internal combustion engine.
  • Fuel can be injected under high pressure into the combustion chamber of the internal combustion engine through the injection openings, the opening of which is controlled by the hollow valve needle and the valve needle.
  • the known fuel injection valve has the disadvantage that the valve needle in the hollow valve needle is guided closely to the end of the hollow valve needle on the combustion chamber side in order to achieve an exact alignment with respect to the valve seat. Since the hollow valve needle can deform somewhat inwards due to the stresses when interacting with the valve seat, in particular if the valve seat is conically shaped, there is increased friction between the valve needle and the hollow valve needle and thus excessive wear.
  • the fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage that the friction between the hollow valve needle and the valve needle always remains low, so that the service life of the fuel injection valve is significantly increased.
  • An exposure is provided between an end section of the valve needle and the hollow valve needle on the combustion chamber side, which ensures sufficient clearance of the valve needle at its end on the combustion chamber side.
  • the exposure is followed by a first guide section of the valve needle which is guided closely in the valve hollow needle, that is to say with little play.
  • a first guide section of the valve needle which is guided closely in the valve hollow needle, that is to say with little play.
  • the valve needle in addition to the first guide section, the valve needle also has a second guide section, with which it is also guided in the hollow valve needle and which is spaced apart from the first guide section. The valve needle can be guided more precisely in the hollow valve needle by means of two guide sections and at the same time the friction between these components.
  • the clearance of the valve needle in the hollow valve needle is greater on the second guide section than on the first guide section.
  • a tightly guided first guide section is important for the exact alignment of the valve needle. Since two guide sections of the valve needle are never exactly aligned in the bore, the play of the second guide section should be greater, so that there is no jamming of the valve needle in the hollow valve needle. It is particularly advantageous to provide an undercut between the two guide sections so that the valve needle is only guided in the guide sections and no friction occurs between them.
  • FIG. 1 shows a fuel injection valve in longitudinal section
  • Figure 2 is an enlargement of Figure 1 in the region of the valve seat and
  • FIG. 3 shows the same representation as Figure 2 of another embodiment. Description of the embodiment
  • a fuel injector is shown in longitudinal section.
  • the fuel injection valve comprises a valve body 1, in which a bore 3 with a longitudinal axis 8 is formed.
  • the bore 3 is delimited at its combustion chamber end by a conical valve seat 16, from which the outer injection openings 17 and inner injection openings 18 extend.
  • the inner injection openings 18 are arranged axially offset from the outer injection openings 17 with respect to the longitudinal axis 8 of the bore 3.
  • a hollow valve needle 10 is arranged to be longitudinally displaceable and is sealingly guided in the bore 3 in a section facing away from the combustion chamber.
  • the hollow valve needle 10 tapers towards the combustion chamber to form a pressure shoulder 14 and merges into a conical valve sealing surface 27 at its end on the combustion chamber side.
  • a pressure chamber 5 is formed between the hollow valve needle 10 and the wall of the bore 3, which is radially expanded at the level of the pressure shoulder 14. In this radial expansion of the pressure chamber 5 opens an inlet channel 7 formed in the valve body 1, via which the pressure chamber 5 can be filled with fuel under high pressure.
  • the hollow valve needle 10 has a longitudinal bore 11 in which a piston-shaped valve needle 12 is arranged to be longitudinally displaceable.
  • the valve needle 12 has a conical valve contact surface 29 at its combustion chamber end, which cooperates with the valve seat 16.
  • FIG. 2 shows an enlargement of FIG.
  • valve needle 12 covers the inner injection openings 18 when it is in contact with the valve seat 16, but not the outer injection openings 17.
  • An annular groove 35 is formed on the end of the valve needle 12 on the combustion chamber side, so that there is a pressure step 39, the surface of which lies opposite the valve seat 16.
  • the control of the injection of fuel through the injection openings 17, 18 works as follows: the hollow valve needle 10 interacts with the valve seat 16 in such a way that when the valve sealing surface 27 is in contact with the valve seat 16, the pressure chamber 5 is closed off against the injection openings 17, 18.
  • a closing force in the direction of the valve seat 16 acts on the hollow valve needle 10 and the valve needle 12 by means of a device (not shown in the drawing), so that the hollow valve needle 10 with its valve sealing surface 27 and the valve needle 12 with their valve contact surface 29 bear against the valve seat 16.
  • the closing force on the hollow valve needle 10 counteracts the hydraulic force by acting on the pressure shoulder 14.
  • Increasing the fuel pressure in the pressure chamber 5 or reducing the closing force on the hollow valve needle 10 results in a force that moves the hollow valve needle 10 away from the valve seat 16.
  • fuel can flow from the pressure chamber 5 to the outer injection openings 17 and is injected from there into the combustion chamber of the internal combustion engine.
  • the valve needle 12 remains temporarily in its
  • the closing force on the valve needle 12 is reduced to such an extent that the valve needle 12, driven by the hydraulic force on the pressure step 39, moves away from the valve seat 16 and releases the inner injection openings 18 .
  • the closing force on the valve needle 12 and the hollow valve needle 10 is increased again or the supply of fuel into the Pressure chamber 5 interrupted so that the valve needle 12 and the hollow valve needle 10 slide back into their closed position.
  • the valve needle 12 is not guided in the longitudinal bore 11 of the hollow valve needle 10 over the entire length of the valve needle 12, but only in certain sections.
  • the valve needle 12 therefore has a first guide section 22 at the end of the valve needle 12 on the combustion chamber side, which ends before the pressure step 39 and which has a play, that is to say a diameter difference, of only about 5 .mu.m with respect to the wall of the longitudinal bore 11. has to achieve an exact guidance of the valve needle 12 in the valve hollow needle 10.
  • This is essential for optimal injection, because usually a plurality of inner injection openings 18 are arranged distributed over the circumference of the valve body 1, so that even a small disaxation of the valve needle 12 leads to an uneven flow of fuel to the individual inner injection openings 18 and thus also to an uneven injection.
  • a second guide section 20 is formed on the valve needle 12, which has a play of approximately 0.03 mm to 0.05 mm with respect to the wall of the longitudinal bore 11.
  • the valve needle 12 is thus guided with the necessary precision in the hollow valve needle 10 without there being an excessive friction surface between these two components.
  • the valve needle 12 has an undercut between the first guide section 22 and the second guide section 20, so that there is a play of approximately 0.1 mm in this area between the valve needle 12 and the wall of the longitudinal bore 11.
  • an exposure 32 adjoins the first guide section 22, which extends as far as the pressure step 39.
  • a clearance D of 0.04 mm to 0.15 mm, preferably less than 0.1 mm, remains between the wall of the longitudinal bore 11 and the valve needle 12. This prevents excessive friction Valve needle 12 in the longitudinal bore 11: In its closed position, the hollow valve needle 10 is pressed against the valve seat 16 with a relatively large closing force. This results in a slight radial indentation of the hollow valve needle 10 in the region of the valve sealing surface 27, which is purely elastic.
  • FIG. 3 shows a further exemplary embodiment, the section shown corresponding to that of FIG. 2.
  • the exposure 32 is not realized here by reducing the diameter of the valve needle 12, but rather by radially widening the longitudinal bore 11. This also results in a reduction in wear in this area with a good and exact guidance of the valve needle 12.
  • the first guide section In this case, 22 extends to the printed paragraph 39.

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 pour moteurs à combustion interne, comportant un corps de soupape (1), dans lequel une aiguille creuse de soupape (10) est placée de manière à pouvoir coulisser longitudinalement dans un orifice (3). Cette aiguille creuse de soupape (10) présente un trou longitudinal (11) et, à son extrémité côté chambre de combustion, une surface d'étanchéité de soupape (27) qui coopère avec un siège de soupape (16) situé à une extrémité côté chambre de combustion de l'orifice (3). Une aiguille de soupape (12), placée dans l'aiguille creuse de soupape (10), coopère également avec le siège de soupape (16) par l'intermédiaire d'une surface d'appui de soupape (29) formée à son extrémité côté chambre de combustion et elle est guidée, sur au moins une partie de sa longueur, dans l'aiguille creuse de soupape (10). Une partie dégagée (32) est prévue entre une partie d'extrémité, côté chambre de combustion, de l'aiguille de soupape (12) et le trou longitudinal (11) de l'aiguille creuse de soupape (10).
PCT/DE2003/000695 2002-03-26 2003-03-03 Soupape d'injection de carburant pour moteurs a combustion interne WO2003081019A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002113384 DE10213384A1 (de) 2002-03-26 2002-03-26 Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10213384.0 2002-03-26

Publications (1)

Publication Number Publication Date
WO2003081019A1 true WO2003081019A1 (fr) 2003-10-02

Family

ID=28050840

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2003/000695 WO2003081019A1 (fr) 2002-03-26 2003-03-03 Soupape d'injection de carburant pour moteurs a combustion interne

Country Status (2)

Country Link
DE (1) DE10213384A1 (fr)
WO (1) WO2003081019A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10428777B2 (en) 2015-06-09 2019-10-01 Denso Corporation Fuel injection device

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1834061A (en) * 1930-04-30 1931-12-01 Westinghouse Electric & Mfg Co Fuel nozzle
DE2711391A1 (de) 1977-03-16 1978-09-21 Bosch Gmbh Robert Kraftstoffeinspritzduese
US4202500A (en) * 1977-03-09 1980-05-13 Maschinenfabrik Augsburg-Nuernberg Aktiengesellschaft Multi-hole injection nozzle
DE4115477A1 (de) * 1990-05-17 1991-11-21 Avl Verbrennungskraft Messtech Einspritzduese fuer eine brennkraftmaschine
DE4115457A1 (de) * 1990-05-17 1991-11-21 Avl Verbrennungskraft Messtech Einspritzduese fuer eine brennkraftmaschine
JPH10274128A (ja) * 1997-03-31 1998-10-13 Aisan Ind Co Ltd 燃料噴射弁
DE19834867A1 (de) * 1997-08-07 1999-02-11 Avl List Gmbh Einspritzdüse für eine direkt einspritzende Brennkraftmaschine
DE10038054A1 (de) * 1999-08-05 2001-02-15 Avl List Gmbh Nockenbetätigte Einspritzeinrichtung für eine Brennkraftmaschine
DE10040738A1 (de) * 1999-08-19 2001-03-15 Avl List Gmbh Einspritzeinrichtung für eine Brennkraftmaschine mit einer als Doppelnadeldüse ausgeführten Einspritzdüse

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1834061A (en) * 1930-04-30 1931-12-01 Westinghouse Electric & Mfg Co Fuel nozzle
US4202500A (en) * 1977-03-09 1980-05-13 Maschinenfabrik Augsburg-Nuernberg Aktiengesellschaft Multi-hole injection nozzle
DE2711391A1 (de) 1977-03-16 1978-09-21 Bosch Gmbh Robert Kraftstoffeinspritzduese
DE4115477A1 (de) * 1990-05-17 1991-11-21 Avl Verbrennungskraft Messtech Einspritzduese fuer eine brennkraftmaschine
DE4115457A1 (de) * 1990-05-17 1991-11-21 Avl Verbrennungskraft Messtech Einspritzduese fuer eine brennkraftmaschine
JPH10274128A (ja) * 1997-03-31 1998-10-13 Aisan Ind Co Ltd 燃料噴射弁
DE19834867A1 (de) * 1997-08-07 1999-02-11 Avl List Gmbh Einspritzdüse für eine direkt einspritzende Brennkraftmaschine
DE10038054A1 (de) * 1999-08-05 2001-02-15 Avl List Gmbh Nockenbetätigte Einspritzeinrichtung für eine Brennkraftmaschine
DE10040738A1 (de) * 1999-08-19 2001-03-15 Avl List Gmbh Einspritzeinrichtung für eine Brennkraftmaschine mit einer als Doppelnadeldüse ausgeführten Einspritzdüse

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 01 29 January 1999 (1999-01-29) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10428777B2 (en) 2015-06-09 2019-10-01 Denso Corporation Fuel injection device

Also Published As

Publication number Publication date
DE10213384A1 (de) 2003-10-16

Similar Documents

Publication Publication Date Title
DE69918902T2 (de) Brennstoffinjektor
DE60126380T2 (de) Kraftstoffeinspritzventil
WO2005052354A1 (fr) Dispositif d'injection de carburant destine a un moteur a combustion interne, notamment a un moteur a combustion interne a injection directe, et procede de fabrication
DE3606246A1 (de) Kraftstoff-einspritzduese fuer brennkraftmaschinen
EP1045978B1 (fr) Soupape d'injection de carburant pour moteurs a combustion interne
DE19834867A1 (de) Einspritzdüse für eine direkt einspritzende Brennkraftmaschine
WO2002077445A1 (fr) Soupape d'injection de carburant pour moteurs a combustion interne
EP1518049B1 (fr) Soupape d'injection de carburant pour moteurs a combustion interne
DE10205218A1 (de) Ventil zur Steuerung einer Verbindung in einem Hochdruckflüssigkeitssystem, insbesondere einer Kraftstoffeinspitzeinrichtung für eine Brennkraftmaschine
EP1373710B1 (fr) Soupape d'injection de carburant pour moteurs a combustion interne
DE10353045A1 (de) Kraftstoffeinspritzventil
DE69921242T2 (de) Kraftstoffeinspritzventil
EP1356203A1 (fr) Dispositif pour alimenter un moteur a combustion interne en carburant sous haute pression
WO2004104406A1 (fr) Soupape d'injection de carburant pour moteurs a combustion interne
EP1043496B1 (fr) Injecteur de combustible pour un moteur à combustion interne
EP1658427A1 (fr) Soupape d'injection de carburant pour des moteurs a combustion interne
EP1671029B1 (fr) Dispositif d'injection de carburant, notamment pour un moteur a combustion interne a injection directe de carburant
WO2003081019A1 (fr) Soupape d'injection de carburant pour moteurs a combustion interne
DE10111783A1 (de) Einspritzdüse
DE10312586A1 (de) Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10121340A1 (de) Common-Rail-Injektor
DE102006036782B4 (de) Injektor
WO2006079425A1 (fr) Système d'injection de carburant
EP1576283A1 (fr) Soupape d'injection de carburant pour moteurs a combustion interne
EP1210512B1 (fr) Injecteur

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CN JP KR PL US

AL Designated countries for regional patents

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 IT LU MC NL PT RO SE SI SK TR

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP