EP0568845A1 - Injecteur de carburant pour moteurs à combustion interne - Google Patents

Injecteur de carburant pour moteurs à combustion interne Download PDF

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Publication number
EP0568845A1
EP0568845A1 EP93106121A EP93106121A EP0568845A1 EP 0568845 A1 EP0568845 A1 EP 0568845A1 EP 93106121 A EP93106121 A EP 93106121A EP 93106121 A EP93106121 A EP 93106121A EP 0568845 A1 EP0568845 A1 EP 0568845A1
Authority
EP
European Patent Office
Prior art keywords
valve needle
closing spring
pressure
disc
shoulder
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
EP93106121A
Other languages
German (de)
English (en)
Inventor
Karl Dipl.-Ing. Hofmann (Fh)
Werner Dipl.-Ing. Wagner (Ba)
Willi Dipl.-Ing. Frank (Fh)
Klaus Dahlmeier
Klaus Dipl.-Ing. Wolf
Wilhelm Dipl.-Ing. Christ
Helmut Dipl.-Ing. Fleischmann (Fh)
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 EP0568845A1 publication Critical patent/EP0568845A1/fr
Ceased legal-status Critical Current

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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
    • 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
    • F02M45/083—Having two or more closing springs acting on injection-valve

Definitions

  • the invention relates to a fuel injection nozzle for the pre and main injection in internal combustion engines according to the preamble of claim 1.
  • the first closing spring acts via the pressure pin and the second closing spring via the pressure piece, directly or via the intermediate member, on the valve needle.
  • the intermediate member has a collar which comes into contact with the pressure piece assigned to the second closing spring.
  • the intermediate member is designed as a flat disk with a uniform circumference and is guided circumferentially in the recess of the intermediate disk.
  • a disc which can be produced cost-effectively as a stamped part, the end faces of which are ground plane-parallel in a simple manner, can be used in various thicknesses as an adjusting disc for setting the advance stroke of the nozzle needle, the parallelism and plan accuracy of the end faces being very high given the small thickness.
  • this part can be used as an adjusting disc for the second opening pressure.
  • this opening pressure can be adjusted without having to dismantle the closing springs.
  • FIG. 1 and FIG. 2 show the two exemplary embodiments in longitudinal section, and are explained in the following description.
  • the two exemplary embodiments according to FIGS. 1 and 2 are used for pre-injection at a first opening pressure and for main injection at a second opening pressure in a diesel internal combustion engine.
  • the two exemplary embodiments differ essentially in the arrangement of two closing springs 11, 12 which determine the opening pressures in a nozzle holder 10, to which a nozzle body 15 is clamped with a union nut 13 via an intermediate disk 14.
  • a valve needle 16 is slidably mounted in the nozzle body 15 and cooperates with an inwardly directed valve seat 17 in the nozzle body 10, which has one or more spray openings 18.
  • the guide bore of the valve needle 16 is expanded at one point to a pressure chamber 19, in the area of which the valve needle 16 has a pressure shoulder 21 and which is connected via a channel 22 to a nozzle 23 on the nozzle holder 10 for connecting a fuel delivery line.
  • the fuel acting on the pressure shoulder 21 of the valve needle 16 pushes the valve needle 16 upward against the graduated force curve of the arrangement of the closing springs 11 and 12 described below, the fuel being in a pre-injection phase determined by the first closing spring 11 and in one of the two closing springs 11. 12 determined main injection phase is sprayed through the spray openings 18 into the combustion chamber.
  • the two closing springs 11, 12 are arranged radially one inside the other in a stepped chamber 25 in the nozzle holder 10.
  • the inner, first closing spring 11 is supported on the one hand by a washer 26 on the base 27 of the chamber 25 and on the other hand on a pressure bolt 28 which guides the first closing spring 11 with a pin 29 and the second closing spring 12 with its jacket.
  • the outer, second closing spring 12 is supported on the one hand by a washer 31 on a shoulder 32 of the chamber 25 and on the other hand by a pressure piece 33 surrounding the pressure bolt 28 on a shoulder 34 formed by the intermediate washer 14.
  • the two closing springs 11, 12 are arranged axially one behind the other in an elongated chamber 35 in the nozzle holder 10, which is divided by an intermediate floor 41.
  • the first closing spring 11, which is remote from the nozzle body 15, is supported on the one hand by a disk 36 on the base 37 of the chamber 35 and on the other hand by means of a pressure piece 39 on a pin-like pressure bolt 38 which passes through the intermediate floor 41 of the chamber 35 and the second closing spring 12.
  • the second closing spring 12 is supported on the one hand on the fixed intermediate floor 41 and on the other hand via a pressure piece 43 surrounding the pressure bolt 38 on a shoulder 44 formed by the intermediate disk 14.
  • the lower end 46 of the pressure bolt 28 and 38 acts continuously on an intermediate member 50 which is supported on an end pin 51 of the valve needle 16 which projects into the intermediate disk 14.
  • This intermediate member 50 which preferably has the shape of a flat cylinder, is axially displaceably guided in a bore 52 in the intermediate disk 14 with its circumference 53 with the required play. It is preferable a stamped disc with two plane-parallel ground, completely flat end faces 54, 55.
  • the thickness of the intermediate member 50 is dimensioned such that its upper end face 54 in the closed position of the valve needle 16 by the amount h v under the shoulder 34 or 44 of the intermediate disc 14 or which lies on this supporting pressure piece 33, 43.
  • the forward stroke h v of the valve needle 16 can be easily adjusted by the appropriate choice of an intermediate member 50 with the required thickness. Intermediate links with different thicknesses are provided for this purpose.
  • the intermediate member 50 abuts the pressure piece 33 and 43, respectively, after which both closing springs 11 and 12 form a pressure stage on the valve needle 16 Act.
  • the total stroke h g of the valve needle 16 is, as is known, limited by the annular shoulder 56 of the valve needle 16 formed at the transition to the end pin 51 and the lower end face of the intermediate disk 12.
  • the pressure level which forms the opening pressure for the main injection and which is dependent on the pretension of the second closing spring 12, can be set by the choice of the thickness of the pressure piece 33 or 43.
  • the pressure piece 33 or 43 is designed as an annular disk with two plane-parallel end faces 58, 59. It can be produced in a simple manner by punching and surface grinding the end faces 58, 59 and is stored in various thicknesses for setting the pressure level.
  • the pressure piece 33 or 43 designed as an annular disk is guided with its circumference in the chamber 25 or 35 accommodating the second closing spring 12 and itself guides the pressure bolt 28 or 38 with the circumference of its opening.
  • the pressure piece 33 or 43, with which the pressure stage of the injection nozzle is set, and the intermediate member 50, with which the advance stroke h v of the valve needle 16 is set, can be arranged in the region of the interface between the nozzle holder 10 and the intermediate disk 14 the setting of the forward stroke and the pressure stage can be carried out without the closing springs 11, 12 having to be dismantled.
  • the end pin supporting the intermediate member can be omitted, and that the intermediate member passes through the intermediate disk and is guided axially displaceably by the latter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP93106121A 1992-05-02 1993-04-15 Injecteur de carburant pour moteurs à combustion interne Ceased EP0568845A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9205975U DE9205975U1 (de) 1992-05-02 1992-05-02 Kraftstoffeinspritzdüse für Brennkraftmaschinen
DE9205975U 1992-05-02

Publications (1)

Publication Number Publication Date
EP0568845A1 true EP0568845A1 (fr) 1993-11-10

Family

ID=6879104

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93106121A Ceased EP0568845A1 (fr) 1992-05-02 1993-04-15 Injecteur de carburant pour moteurs à combustion interne

Country Status (3)

Country Link
EP (1) EP0568845A1 (fr)
JP (1) JPH0626417A (fr)
DE (1) DE9205975U1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4340874A1 (de) * 1993-12-01 1995-06-08 Bosch Gmbh Robert Kraftstoff-Einspritzdüse für Brennkraftmaschinen
FR2726862A1 (fr) * 1994-11-10 1996-05-15 Bosch Gmbh Robert Injecteur pour moteur a combustion interne
EP1072788A2 (fr) * 1999-07-30 2001-01-31 Delphi Technologies, Inc. Procédé de formation d'une chambre dans une pièce
EP1116879A3 (fr) * 2000-01-14 2003-10-15 Delphi Technologies, Inc. Support de ressort

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1026572B (de) * 1956-11-16 1958-03-20 Friedmann & Maier Ag Einspritzduese fuer Einspritzbrennkraftmaschinen
GB2093118A (en) * 1981-02-17 1982-08-25 Bosch Gmbh Robert Fuel injection nozzle
EP0475843B1 (fr) * 1990-09-12 1995-06-21 Nissan Motor Co., Ltd. Moteur à combustion diesel à injection interne

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1026572B (de) * 1956-11-16 1958-03-20 Friedmann & Maier Ag Einspritzduese fuer Einspritzbrennkraftmaschinen
DE1041299B (de) * 1956-11-16 1958-10-16 Friedmann & Maier Ag Einspritzduese fuer Einspritzbrennkraftmaschinen
GB2093118A (en) * 1981-02-17 1982-08-25 Bosch Gmbh Robert Fuel injection nozzle
EP0475843B1 (fr) * 1990-09-12 1995-06-21 Nissan Motor Co., Ltd. Moteur à combustion diesel à injection interne

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4340874A1 (de) * 1993-12-01 1995-06-08 Bosch Gmbh Robert Kraftstoff-Einspritzdüse für Brennkraftmaschinen
FR2726862A1 (fr) * 1994-11-10 1996-05-15 Bosch Gmbh Robert Injecteur pour moteur a combustion interne
US5727738A (en) * 1994-11-10 1998-03-17 Robert Bosch Gmbh Fuel injection valve for internal combustion engines
EP1072788A2 (fr) * 1999-07-30 2001-01-31 Delphi Technologies, Inc. Procédé de formation d'une chambre dans une pièce
EP1072788A3 (fr) * 1999-07-30 2002-07-03 Delphi Technologies, Inc. Procédé de formation d'une chambre dans une pièce
EP1116879A3 (fr) * 2000-01-14 2003-10-15 Delphi Technologies, Inc. Support de ressort

Also Published As

Publication number Publication date
JPH0626417A (ja) 1994-02-01
DE9205975U1 (de) 1993-09-09

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