EP1181445A2 - Soupape d'injection de carburant pour moteurs a combustion interne - Google Patents

Soupape d'injection de carburant pour moteurs a combustion interne

Info

Publication number
EP1181445A2
EP1181445A2 EP01909417A EP01909417A EP1181445A2 EP 1181445 A2 EP1181445 A2 EP 1181445A2 EP 01909417 A EP01909417 A EP 01909417A EP 01909417 A EP01909417 A EP 01909417A EP 1181445 A2 EP1181445 A2 EP 1181445A2
Authority
EP
European Patent Office
Prior art keywords
valve
valve member
sealing surface
fuel injection
seat
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.)
Granted
Application number
EP01909417A
Other languages
German (de)
English (en)
Other versions
EP1181445B1 (fr
Inventor
Friedrich Boecking
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 EP1181445A2 publication Critical patent/EP1181445A2/fr
Application granted granted Critical
Publication of EP1181445B1 publication Critical patent/EP1181445B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M61/1873—Valve seats or member ends having circumferential grooves or ridges, e.g. toroidal
    • 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
    • F02M61/047—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 the valves being formed by deformable nozzle parts, e.g. flexible plates or discs with fuel discharge orifices

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 internal combustion engines according to the preamble of claim 1.
  • Such a fuel injection valve is known from published patent application DE 196 08 575.
  • An essentially conical tip is formed at the end of the valve member on the combustion chamber side. This tip is divided into two sections, the tip cone angle of the outer section facing the combustion chamber being greater than that of the inner section facing the valve member.
  • a circumferential ring edge is formed as a sealing surface on the outer surface of the valve member tip.
  • valve member is arranged in a bore in the form of a blind bore, the closed end facing the combustion chamber being designed as a valve seat which has a substantially conical shape. At least one injection opening is formed in the valve seat, which opens the inside of the
  • Valve connects to the combustion chamber with the valve member lifted off the valve seat.
  • valve member comes to the valve seat with its valve sealing surface Investment.
  • the cone angle of the valve seat is dimensioned so that the valve member is seated essentially only with the ring edge on the valve seat. This results in a good sealing of the pressure chamber against the injection openings on the one hand, but on the other hand the problem that the high surface pressure leads to deformations of the valve member and valve seat over time.
  • the ring edge and / or the valve seat deform, which changes the effective seat diameter of the valve member. This changes. also the effective passage cross section of the fuel injection valve and the size of the areas exposed to pressure on the valve member, which has a disadvantageous effect on the fuel injection curve and the injection accuracy.
  • the fuel injector according to the invention with the characterizing features of claim 1 has the advantage that the part of the valve member tip bearing the valve sealing surface is designed as a flexible ring collar, whereby in the closed position of the valve member the part bearing the valve sealing surface rests flat on the valve seat after first contact with the line.
  • the outer edge of the ring collar defines a fixed seat diameter.
  • the increasing contact surface of the valve member on the valve seat results in a relatively low surface pressure in the area of the valve seat, which leads to little wear in this area.
  • the seat diameter thus remains constant over the service life of the fuel injector.
  • valve sealing surface is undercut in part by the annular groove, so that the annular collar is made increasingly lip-shaped and the deformation work of the annular collar is reduced.
  • FIG. 1 shows a longitudinal section through a valve body with valve member
  • FIG. 2 shows an enlarged section of FIG. 1 in the area of the valve seat
  • FIG. 3 shows an enlarged section of FIG. 2 in the area of the valve sealing surface.
  • FIG. 1 shows a longitudinal section through an embodiment of the fuel injection valve according to the invention.
  • a valve body 1 the end face of which faces away from the combustion chamber in the installed position comes to bear at least indirectly on a valve holding body (not shown in the drawing) has a bore 5 designed as a blind bore.
  • the bottom surface is designed as a valve seat 11 and is approximately conical with a cone angle ⁇ , the inside diameter of the valve seat 11 narrowing toward the combustion chamber.
  • At least one injection opening 13 is formed on the valve seat 11 and connects the bore 5 to the combustion chamber.
  • a piston-shaped valve member 7 Arranged in the bore 5 is a piston-shaped valve member 7, which has a larger combustion chamber Section facing away is guided in the bore 5 and which, with the formation of a pressure shoulder 15, merges into the combustion chamber into a valve member shaft 7 1 with a smaller diameter.
  • a pressure chamber 17 is formed between the wall of the bore 5 and the valve member shaft 7 ', which surrounds the valve member 7 and the pressure shoulder 15 and extends to the valve seat 11.
  • An inlet duct 21 formed in the valve body 1 opens into the pressure chamber 17, via which the pressure chamber 17 can be filled with fuel under high pressure.
  • valve member shaft 7 ′ merges into a valve member tip 30, the outer surface of which is approximately conical and forms a valve sealing surface 9, which cooperates with the valve seat 11.
  • the valve member 7 is pressed by the force of a closing spring (not shown in the drawing) with the valve sealing surface 9 against the valve seat 11, so that in this closed position the injection opening 13 is sealed against the pressure chamber 17 by the valve sealing surface 9.
  • the pressure chamber 17 In the open position of the valve member 7, that is, when the valve sealing surface 9 lifts against an closing force by an axial movement of the valve member 7 from the combustion chamber away from the valve seat 11 under the action of the fuel supplied to the pressure chamber 17 under high pressure, the pressure chamber 17 is above the one - Spray opening 13 connected to the combustion chamber and fuel is injected into the combustion chamber.
  • FIG. 2 shows an enlargement of the fuel injection valve shown in FIG. 1 in the region of the valve seat 11 in the closed position.
  • the outer surface of the valve member tip 30 is divided into two sections which are separated from one another by an annular groove 25.
  • the first valve member section 30a forming the end of the valve member 7 has a conical lateral surface with a cone angle ⁇
  • the second valve member section 30b, which to the side of the valve member shaft 7 'connects to the annular groove 25, has a truncated cone-shaped outer surface with a cone angle ⁇ .
  • the cone angle ⁇ is larger than the cone angle ⁇ , and the two sections of the valve member tip 30 are designed such that only the outer surface of the second, frustoconical valve member section 30b carries the valve sealing surface 9.
  • annular groove 23 is formed, which releases the second valve member section 30b carrying the valve sealing surface 9 and is preferably designed such that it partially undercuts the section 30b.
  • annular collar 28 is formed, which is resilient and can thus adapt to the valve seat 11 by deforming when it is in contact with the valve seat 11 under the action of the closing force.
  • the annular groove 25 arranged at the transition of the two valve member sections 30a, 30b of the valve member tip 30 ensures a better fuel distribution in the volume between the valve member tip 30 and the valve seat 11, if it is provided to arrange more than one injection opening 13 on the valve seat 11.
  • the annular groove 25 is located upstream of the discharge injection openings 13.
  • FIG. 3 shows an enlargement of the valve member 7 in the area of the valve sealing surface 9.
  • the lateral surface of the annular collar 28 has an opening angle ß, which is not the same, but is slightly larger than the cone angle ⁇ of the valve seat 11.
  • the difference angle ⁇ is dimensioned such that the annular collar 28, which is in the closed position of the valve member 7 by the force of the Closing spring is pressed against the valve seat 11, can spring purely elastically perpendicular to the surface of the valve seat 11 to the inside and thus rests flat against the valve seat 11.
  • the feathering is supported by that part of the valve sealing surface 9 is undercut by the annular groove 23, so that a reduced cross section is formed at the base of the annular collar.
  • Valve sealing surface 9 forms, is not pressed into the valve seat 11 by this configuration, since the full force of the closing spring only acts on the valve seat 11 after the deformation.
  • the diameter of the first contact of the valve member 7 with the valve seat 11 remains unchanged.
  • the difference angle ⁇ between the cone angles of the valve sealing surface 9 and the valve seat 11 must be less than 1 degree, preferably 0.25 to 0.75 Degree.
  • valve member 7 During the closing movement of the valve member 7 towards the valve seat 11, the sealing edge 34 comes into contact with the valve seat 11 first. Due to the force of the closing spring, the valve member 7 is pressed further onto the valve seat 11, so that the annular collar 28 is pressed inwards until the entire, frustoconical valve sealing surface 9 comes into contact with the valve seat 11.
  • valve member tip 30 By dividing the valve member tip 30 by an annular groove into two valve member sections 30a, 30b, it can also be provided that the annular groove 25 is omitted, as a result of the different cone angle of the two valve member sections 30a, 30b forming an annular edge at their transition.

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 est disposé à l'intérieur d'un alésage (5) un élément de soupape (7) qui peut se déplacer axialement en opposition à une force de fermeture. Cet élément de soupape (7) comporte en son extrémité une pointe (30) essentiellement conique, dont une partie de la surface latérale, servant de surface d'étanchéité (9), s'appuie contre un siège de soupape (11) situé sur l'extrémité de l'alésage (5) qui se trouve du côté de la chambre de combustion. A la jonction de l'élément de soupape (7) avec la pointe (30) de celui-ci se trouve une rainure (23) annulaire qui dégage en partie la surface d'étanchéité (9) et forme ainsi un col annulaire (28) élastique. L'angle de cône ( beta ) de la surface d'étanchéité (9) est, lorsque l'élément de soupape (7) est en position d'ouverture, un peu plus grand que l'angle de cône ( alpha ) du siège de soupape (11), de telle sorte que le col annulaire (28), lorsque l'élément de soupape (7) effectue le mouvement de fermeture, touche le siège de soupape, d'abord avec le bord extérieur formant une arête d'étanchéité (34), puis il est contraint vers l'intérieur à mesure que le mouvement de fermeture se poursuit. L'arête d'étanchéité (34) n'est donc pas enfoncée dans le siège de soupape (11), le diamètre du siège gardant ainsi la même dimension durant toute la longévité de la soupape d'injection de carburant.
EP01909417A 2000-01-08 2001-01-05 Soupape d'injection de carburant pour moteurs a combustion interne Expired - Lifetime EP1181445B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10000501 2000-01-08
DE10000501A DE10000501A1 (de) 2000-01-08 2000-01-08 Kraftstoffeinspritzventil für Brennkraftmaschinen
PCT/DE2001/000003 WO2001051804A2 (fr) 2000-01-08 2001-01-05 Soupape d'injection de carburant pour moteurs a combustion interne

Publications (2)

Publication Number Publication Date
EP1181445A2 true EP1181445A2 (fr) 2002-02-27
EP1181445B1 EP1181445B1 (fr) 2005-04-06

Family

ID=7626967

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01909417A Expired - Lifetime EP1181445B1 (fr) 2000-01-08 2001-01-05 Soupape d'injection de carburant pour moteurs a combustion interne

Country Status (6)

Country Link
US (1) US6669117B2 (fr)
EP (1) EP1181445B1 (fr)
JP (1) JP2003519756A (fr)
DE (2) DE10000501A1 (fr)
PL (1) PL350824A1 (fr)
WO (1) WO2001051804A2 (fr)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19942370A1 (de) * 1999-09-04 2001-03-22 Bosch Gmbh Robert Einspritzdüse für Brennkraftmaschinen mit einer Ringnut in der Düsennadel
DE10031264A1 (de) * 2000-06-27 2002-01-17 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10031537B4 (de) * 2000-06-28 2009-06-04 Continental Automotive Gmbh Ausbildung eines Einspritzventils zur Verminderung der Sitzbelastung
DE10219608A1 (de) 2002-05-02 2003-11-20 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10246693A1 (de) * 2002-10-07 2004-04-15 Siemens Ag Einspritzvorrichtung zum Einspritzen von Kraftstoff
DE10260975A1 (de) * 2002-12-24 2004-07-08 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10322826A1 (de) * 2003-05-19 2004-12-09 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10344897A1 (de) * 2003-09-26 2005-04-21 Bosch Gmbh Robert Ventil zur Steuerung einer Verbindung in einem Hochdruckflüssigkeitssystem, insbesondere einer Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE60305038T2 (de) 2003-10-06 2007-05-16 Delphi Technologies, Inc., Troy Einspritzdüse
DE10351680A1 (de) * 2003-11-05 2005-06-09 Robert Bosch Gmbh Ventil für eine Kraftstoffeinspritzpumpe
ATE350575T1 (de) * 2004-01-13 2007-01-15 Delphi Tech Inc Einspritzdüse
EP1559903B1 (fr) * 2004-01-28 2008-12-10 Continental Automotive Italy S.p.A. Injecteur de carburant avec aiguille déformable
DE102004059974A1 (de) * 2004-11-23 2006-06-01 Siemens Ag Düsenbaugruppe und Einspritzventil
DE102005037955A1 (de) * 2005-08-11 2007-02-15 Robert Bosch Gmbh Teilentdrosseltes Einspritzventilglied für Kraftstoffinjektoren
US7360722B2 (en) * 2005-08-25 2008-04-22 Caterpillar Inc. Fuel injector with grooved check member
US7578450B2 (en) * 2005-08-25 2009-08-25 Caterpillar Inc. Fuel injector with grooved check member
DE102006052817A1 (de) * 2006-11-09 2008-05-15 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102010040940A1 (de) 2010-09-17 2012-03-22 Robert Bosch Gmbh Düsenbaugruppe für einen Kraftstoffinjektor
JP5708342B2 (ja) * 2011-07-22 2015-04-30 株式会社デンソー 弁装置およびそれを用いた流体制御弁
DE102012204310A1 (de) * 2012-03-19 2013-09-19 Robert Bosch Gmbh Dicht umspritztes Bauelement und Verfahren zum Herstellen eines solchen Bauelements
DE102012211283A1 (de) 2012-06-29 2014-01-02 Robert Bosch Gmbh Leckage- und schlupfreduziertes Ventil

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
JPS5882068A (ja) * 1981-11-09 1983-05-17 Nissan Motor Co Ltd 燃料噴射ノズル
DE3429471A1 (de) * 1984-08-10 1986-02-13 L'Orange GmbH, 7000 Stuttgart Kraftstoffeinspritzvorrichtung fuer eine brennkraftmaschine
GB9012844D0 (en) * 1990-06-08 1990-08-01 Lucas Ind Plc Fuel injection nozzles
GB9425652D0 (en) * 1994-12-20 1995-02-22 Lucas Ind Plc Fuel injection nozzle
DE19536330A1 (de) * 1995-09-29 1997-04-03 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19608575B4 (de) 1996-03-06 2005-10-20 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
JP3075201B2 (ja) * 1996-12-20 2000-08-14 株式会社デンソー 燃料噴射弁

Non-Patent Citations (1)

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Title
See references of WO0151804A2 *

Also Published As

Publication number Publication date
WO2001051804A2 (fr) 2001-07-19
EP1181445B1 (fr) 2005-04-06
WO2001051804A3 (fr) 2001-12-06
PL350824A1 (en) 2003-02-10
JP2003519756A (ja) 2003-06-24
DE50105813D1 (de) 2005-05-12
DE10000501A1 (de) 2001-07-19
US6669117B2 (en) 2003-12-30
US20030057298A1 (en) 2003-03-27

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