EP1115968B1 - Injecteur par accumulation de pression - Google Patents

Injecteur par accumulation de pression Download PDF

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Publication number
EP1115968B1
EP1115968B1 EP00949112A EP00949112A EP1115968B1 EP 1115968 B1 EP1115968 B1 EP 1115968B1 EP 00949112 A EP00949112 A EP 00949112A EP 00949112 A EP00949112 A EP 00949112A EP 1115968 B1 EP1115968 B1 EP 1115968B1
Authority
EP
European Patent Office
Prior art keywords
fuel
injector
control piston
sleeve
closed
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.)
Expired - Lifetime
Application number
EP00949112A
Other languages
German (de)
English (en)
Other versions
EP1115968A1 (fr
Inventor
Josef Buergler
Franz Guggenbichler
Peter Mueller
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 EP1115968A1 publication Critical patent/EP1115968A1/fr
Application granted granted Critical
Publication of EP1115968B1 publication Critical patent/EP1115968B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
    • F02M63/0007—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using electrically actuated valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F2007/0097—Casings, e.g. crankcases or frames for large diesel engines

Definitions

  • the invention relates to a common rail injector according to the Preamble of claim 1 for the injection of fuel into a common rail injection system in an internal combustion engine, especially a large diesel engine.
  • a high pressure pump supports the Fuel into the central high-pressure accumulator, which acts as a common rail referred to as.
  • Lead from the high pressure accumulator High pressure lines to the individual injectors that the Engine cylinders are assigned.
  • the injectors are single controlled by the engine electronics.
  • the rail pressure is on the 3/2-way solenoid valve that connects the high pressure holes keeps conventional injection nozzle depressurized. Only with one The 3/2-way solenoid valve opens when the solenoid is energized Connection from the rail to the injector, and the fuel arrives at the raised against the force of a valve spring Nozzle needle over into the combustion chamber. Start of injection and Splashing will be by the beginning and end of the energization of the Magnets determined. The duration of the current supply is decisive for the Injection quantity.
  • the object of the invention is to control the movement of the control piston optimize the flight phase.
  • the invention relates to a common rail injector for the injection of fuel in a common rail injection system in an internal combustion engine, in particular a large diesel internal combustion engine, with an injector housing, with a 3/2-way solenoid valve integrated in the injector housing, with a high-pressure bore for controlling a nozzle needle which is axially displaceable against the biasing force of a nozzle spring which is accommodated in a nozzle spring chamber, the 3/2-way solenoid valve having a control piston which can be moved back and forth between a closed and an open valve position and which on the one its two ends is coupled to an armature and the other end of which projects into an unpressurized space, the fuel inlet being connected to the high-pressure bore of the injection nozzle in the open valve position, and the fuel inlet being closed by the control piston and the high-pressure bore in the closed valve position d he injection nozzle communicates with a fuel outlet and the unpressurized space, a first throttle point being arranged between the high-pressure bore and the fuel outlet,
  • the second throttle point prevents the Flight phase of pressurized fuel into the unpressurized room arrives.
  • the inflow of pressurized fuel into the unpressurized room could otherwise cause pressure impulses on the Guide the face of the control piston. These pressure pulses would counteract the valve spring force and could lead to a Malfunction of the 3/2-way solenoid valve.
  • Another special embodiment of the invention is thereby characterized in that a sleeve for in the injector housing Guide of the control piston is used.
  • the sleeve can either with or without a control piston already installed in the Injector housing can be installed.
  • the use of the sleeve has the advantage that it works much easier in manufacturing can be called the injector housing.
  • a worn sleeve can be easily replaced with a new sleeve. It is no longer necessary to replace the injector housing.
  • Another special embodiment of the invention is thereby characterized in that in the sleeve in the area of Fuel inlet, the fuel outlet and the connection to High pressure bore each an opening is recessed in one annulus opens. This creates a good distribution of fuel guaranteed.
  • Another special embodiment of the invention is characterized in that the sleeve is formed from a high-speed steel with a higher hardness than the injector housing. This significantly increases the life of the injector.
  • Another special embodiment of the invention is characterized in that the diameter play on the Throttling points is 0.005 to 0.05 mm. Have these values yourself in the context of the present invention performed investigations as particularly advantageous proved.
  • the injector 1 shows an injector according to the invention as a whole 1 designated.
  • the injector 1 comprises an injector housing 2. Passes through a fuel inlet 3 at high pressure charged fuel inside the Injector housing 2.
  • the Fuel from the fuel inlet 3 in one High pressure bore 5 leads to a Injection nozzle 6.
  • the injection nozzle 6 comprises a nozzle needle 7 by a nozzle spring 8 against a nozzle needle seat is pressed.
  • the nozzle spring 8 is in a nozzle spring chamber 9 arranged, which is depressurized. Which is in operation in the Nozzle spring chamber 9 fuel is collected via a Fuel channel 10 and a throttle 11 discharged.
  • the 3/2-way solenoid valve 4 includes one Magnets 13 to a control piston 14 against the To bias a valve spring 16 back and forth.
  • the control piston 14 is coupled to an armature 15 which cooperates with the magnets 13.
  • the control piston 14 is in one Bore 18 received in the injector housing 2. Between the control piston 14 and the injector housing 2 is one Sleeve 19 arranged.
  • the sleeve 19 is in that Injector housing 2 shrunk and used for axial Guide of the control piston 14.
  • In the area of Fuel inlet 3 is a first in the sleeve 19 Annealed space.
  • the inner diameter of the sleeve 19 is on both sides of the first annular space 20 measured differently.
  • On the valve spring 16 facing side is the inner diameter of the sleeve 19th larger than on the side facing away from the valve spring 16 of the first annular space 20.
  • On the valve spring 16 opposite side of the first annular space 20 is located so a section 21 with a slightly reduced Inner diameter. Between the first annulus 20 and the Section 21 has a first conical seat 22.
  • Section 21 is followed by a second annular space 23 second annular space 23 is in with the high pressure bore 5 in Connection.
  • a section follows the second annular space 23 24 of the sleeve 19 with the same inner diameter as that from the first annular space 20 to the valve spring 16 facing side of the sleeve 19th
  • a bushing 26 is on the free end of the control piston 14 attached and fastened using a nut 25. Between the sleeve 26 and the portion 24 of the sleeve 19th a first throttle point 27 is formed. It is manufacturing technology and in terms of assembly effort cheaper to close the nut or thread into the socket integrate. Then the bushing 26 can be on the control piston 14 are screwed on and the nut 25 falls away.
  • the first throttle point 27 follows in the area of Fuel outlet 12, a third annulus 28. Between the third annular space 28 and the unpressurized nozzle spring space 9 a second throttle point 29 is formed.
  • FIG. 3 is an injector designated overall by 31 shown in sections.
  • a fuel inlet 3 in the longitudinal direction of the Injector housing 2 arranged.
  • the fuel inlet 3 is depending on the position of a 3/2-way solenoid valve 4 closed or is connected to a high pressure bore 5.
  • the High-pressure bore 5 does not lead to one in FIG. 3 injector shown.
  • the closed position of the 3/2-way solenoid valve 4 is the high pressure bore 5 with a fuel drain 12 in connection.
  • the 3/2-way valve 4 comprises a magnet 13 which is a control piston 14 using an anchor 15 against the biasing force of one Valve spring 16 actuated. As long as the magnet 13 is not is energized, the valve spring 16 ensures that the Fuel inlet 3 remains closed.
  • a sleeve 19 is shrunk.
  • the sleeve 19 has the same function as in the previous with reference to Figures 1 and 2 embodiment described.
  • a first cone seat 22 closed. If the magnet 13 is energized, the control piston 14 moves against the Biasing force of the valve spring 16 on the magnet 13. The first cone seat 22 opens. The movement of the Control piston 14 continues until a second Cone seat 17 closes. Between the high pressure bore 5 and the second cone seat 17 is a throttle point 27 educated.

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 par accumulation de pression comprenant un boîtier (2) communiquant avec un réservoir central de haute pression, par l'intermédiaire d'une arrivée de carburant (3), ledit réservoir étant alimenté en carburant depuis un réservoir de carburant. Le carburant parvient en fonction de la position d'une électrovanne (4) dans un alésage haute pression (5) d'une buse d'injection (6). L'électrovanne présente un piston pilote (14) à déplacement en va-et-vient entre une position fermée et une position fermée, qui est couplé à une de ces extrémités à un induit (15), l'autre extrémité faisant saillie dans un espace (9) sans pression. En position fermée de l'électrovanne, l'arrivée de carburant (3) communique avec l'alésage haute pression (5) de la buse d'injection (6). En position fermée de l'électrovanne, l'arrivée de carburant (3) est fermée par le piston pilote (14). L'alésage haute pression (5) de la buse d'injection (6) communique avec un orifice de sortie de carburant (12) et l'espace (9) sans pression. Afin d'optimiser le mouvement du piston pilote dans la phase volante, un premier point d'étranglement (27) est aménagé entre l'alésage haute pression (5) et l'orifice de sortie de carburant (12).

Claims (5)

  1. Injecteur pour rampe commune pour injecter du carburant dans un système d'injection à rampe commune d'un moteur à combustion interne, notamment d'un grand moteur diesel, comprenant un carter d'injecteur (2), avec une entrée de carburant (3), avec une électrovanne 3/2 voies (4) intégrée dans le carter d'injecteur (2), avec un alésage haute pression (5) dans le carter d'injecteur (2) pour commander une aiguille (7) déplaçable axialement contre la force de précontrainte d'un ressort de buse (8), logé dans une chambre de ressort de buse (9), l'électrovanne 3/2 voies (4) présentant un piston de commande (14) pouvant exécuter un mouvement de va-et-vient entre une position de soupape fermée et une position de soupape ouverte, et qui à l'une de ses deux extrémités est accouplé à un induit (15) tandis que l'autre extrémité pénètre dans un espace (9) sans pression, et dont dans la position de soupape ouverte l'entrée de carburant (3) est en communication avec le perçage haute pression (5) de la buse d'injection (6), alors que dans la position de soupape fermée l'entrée de carburant (3) est fermée par le piston de commande (14), l'alésage haute pression (5) de la buse d'injection (6) étant en communication avec une évacuation de carburant (12) et avec l'espace sans pression (9) un premier point d'étranglement (27) étant disposé entre l'alésage haute pression (5) et l'évacuation de carburant (12),
    caractérisé en ce qu'
    un deuxième point d'étranglement est disposé entre l'évacuation de carburant (12) et l'espace sans pression (9).
  2. Injecteur selon la revendication 1,
    caractérisé par
    une douille (19) pour guider le piston de commande (14) insérée dans le carter d'injecteur (2).
  3. Injecteur selon la revendication 2,
    caractérisé en ce que
    dans la zone d'entrée de carburant (3), de l'évacuation de carburant (12) et de la communication vers l'alésage haute pression (5), la douille (19) comporte chaque fois une ouverture qui débouche respectivement dans une chambre annulaire (20, 23, 28).
  4. Injecteur selon la revendication 2 ou 3,
    caractérisé en ce que
    la douille (19) est formée à partir d'un acier rapide d'une plus grande dureté que le carter d'injecteur (2).
  5. Injecteur selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le jeu de diamètre au niveau des points d'étranglement (27, 29) est compris entre 0,005 et 0,05 mm.
EP00949112A 1999-06-24 2000-06-23 Injecteur par accumulation de pression Expired - Lifetime EP1115968B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19928846 1999-06-24
DE19928846A DE19928846A1 (de) 1999-06-24 1999-06-24 Common-Rail-Injektor
PCT/DE2000/001975 WO2001000980A1 (fr) 1999-06-24 2000-06-23 Injecteur par accumulation de pression

Publications (2)

Publication Number Publication Date
EP1115968A1 EP1115968A1 (fr) 2001-07-18
EP1115968B1 true EP1115968B1 (fr) 2004-10-13

Family

ID=7912315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00949112A Expired - Lifetime EP1115968B1 (fr) 1999-06-24 2000-06-23 Injecteur par accumulation de pression

Country Status (5)

Country Link
US (1) US6565013B1 (fr)
EP (1) EP1115968B1 (fr)
JP (1) JP2003503625A (fr)
DE (2) DE19928846A1 (fr)
WO (1) WO2001000980A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10103089A1 (de) * 2001-01-24 2002-08-08 Bosch Gmbh Robert 3/2-Wegeventil
US7278593B2 (en) * 2002-09-25 2007-10-09 Caterpillar Inc. Common rail fuel injector
EE05516B1 (et) 2002-09-25 2012-02-15 Memory@Pharmaceuticals@Corporation Indasoolid bensotiasoolid ja bensoisotiasoolid nende valmistamine ning kasutamine
EP1621764B1 (fr) * 2004-06-30 2007-11-07 C.R.F. Società Consortile per Azioni Injecteur d'un moteur à combustion interne
EP3483420B1 (fr) * 2017-11-13 2020-06-17 Winterthur Gas & Diesel AG Buse d'injection de carburant et procédé d'injection de carburant pour un gros moteur diesel ainsi que gros moteur diesel

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4164326A (en) * 1978-04-06 1979-08-14 General Motors Corporation Electromagnetic fuel injector nozzle assembly
JPS5655769U (fr) * 1979-10-05 1981-05-14
DE3743532A1 (de) * 1987-12-22 1989-07-06 Bosch Gmbh Robert Kraftstoffeinspritzanlage fuer brennkraftmaschinen
DE4029159A1 (de) * 1990-01-03 1991-07-04 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung fuer einspritzbrennkraftmaschinen
US5397055A (en) * 1991-11-01 1995-03-14 Paul; Marius A. Fuel injector system
DE4341546A1 (de) 1993-12-07 1995-06-08 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen
DE4341543A1 (de) * 1993-12-07 1995-06-08 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen
DE19701879A1 (de) * 1997-01-21 1998-07-23 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen
DE29717649U1 (de) * 1997-10-02 1997-11-20 FEV Motorentechnik GmbH & Co. KG, 52078 Aachen Direktgesteuertes Einspritzventil, insbesondere Kraftstoffeinspritzventil

Also Published As

Publication number Publication date
US6565013B1 (en) 2003-05-20
WO2001000980A1 (fr) 2001-01-04
EP1115968A1 (fr) 2001-07-18
DE50008219D1 (en) 2004-11-18
JP2003503625A (ja) 2003-01-28
DE19928846A1 (de) 2001-03-08
WO2001000980A8 (fr) 2001-03-29

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