EP2047095A1 - Injecteur de carburant - Google Patents

Injecteur de carburant

Info

Publication number
EP2047095A1
EP2047095A1 EP07729829A EP07729829A EP2047095A1 EP 2047095 A1 EP2047095 A1 EP 2047095A1 EP 07729829 A EP07729829 A EP 07729829A EP 07729829 A EP07729829 A EP 07729829A EP 2047095 A1 EP2047095 A1 EP 2047095A1
Authority
EP
European Patent Office
Prior art keywords
chamber
pressure
control
valve
fuel injector
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.)
Withdrawn
Application number
EP07729829A
Other languages
German (de)
English (en)
Inventor
Nadja Eisenmenger
Hans-Christoph Magel
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 EP2047095A1 publication Critical patent/EP2047095A1/fr
Withdrawn legal-status Critical Current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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston
    • 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
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • 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
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • 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
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0043—Two-way valves

Definitions

  • the invention relates to a fuel injector according to the preamble of claim 1.
  • stroke-controlled fuel injectors can be used in which the injection pressure can be adapted to load and speed.
  • solenoid valves or piezo valves can be used.
  • the object of the invention is to provide a fuel injector according to the preamble of claim 1, which is simple in construction and inexpensive to produce.
  • the object is in a fuel injector with an injector, which includes a pressure chamber is injected from the depending on the pressure in a control room, high-pressure fuel into a combustion chamber of an internal combustion engine, when the pressure in the control chamber by means of a control valve device so far is lowered, that opens a nozzle needle, achieved in that the pressure chamber is closed at its brennraumfer- end by a valve piece having a combustion chamber facing away from the sealing surface or sealing edge, which bears with sealing effect on the Injektorgepur to form a sealing seat.
  • the inventive arrangement of the valve piece provides the advantage that the pressure prevailing in the pressure chamber hydraulic pressure can be used to hold the valve piece under sealing effect in abutment against the injector.
  • a preferred embodiment of the fuel injector is characterized in that the valve piece has a pressure chamber portion which is arranged in the pressure chamber. The pressure chamber section of the valve piece is acted upon by the hydraulic pressure prevailing in the pressure chamber.
  • a further preferred embodiment of the fuel injector is characterized in that a valve piston of the control valve device is guided in the valve piece.
  • the valve piston is preferably designed to be pressure balanced.
  • a further preferred embodiment of the fuel injector is characterized in that that the valve piston rests with its end close to the combustion chamber on a control piece, which in turn bears against the valve piece.
  • the valve piston has a sealing edge, which rests as a flat seat on the control piece.
  • a further preferred embodiment of the fuel injector is characterized in that the combustion chamber remote end of the nozzle needle is guided in the control piece and limits the control space in the control piece.
  • the control piece is preferably held in contact with the valve piece by the spring force of a spring device and / or by the hydraulic pressure prevailing in the pressure chamber.
  • valve piston has a pressure relief connection.
  • valve piston has a central through hole, which opens into the sealing seat at the combustion chamber near the end of the valve piston and is in communication with a pressure relief space.
  • a further preferred exemplary embodiment of the fuel injector is characterized in that a valve seat of the control valve device is formed at the end of the valve piece remote from the combustion chamber.
  • the valve seat is designed for example as a ball seat, conical seat or flat seat.
  • a further preferred embodiment of the fuel injector is characterized in that the nozzle needle comprises two sections which are coupled together.
  • the sections may be coupled together mechanically or hydraulically.
  • a further preferred embodiment of the fuel injector is characterized in that the valve piece and / or the control piece has at least one connection which connects the pressure chamber with a pressure chamber or the pressure chamber or the pressure chamber with the control chamber.
  • the connection is equipped with a throttle.
  • Figure 1 is a schematic representation of a fuel injector according to the invention in Long section according to a first exemplary embodiment
  • Figure 2 shows a similar fuel injector as in Figure 1 according to a second embodiment
  • FIG. 3 a section of a fuel injector according to a further embodiment in longitudinal section.
  • the fuel injector 1 shows a fuel injector 1 is shown schematically in longitudinal section.
  • the fuel injector 1 is supplied from a high-pressure reservoir 2 with fuel under high pressure. Via a feed line 3 of the fuel injector 1 is connected to the high-pressure accumulator 2.
  • the fuel injector 1 comprises an injector housing 6 with an injector body 7 and a nozzle body 8, which has a central guide bore 9.
  • a nozzle needle 10 is guided back and forth movable.
  • the nozzle needle 10 has a tip 11, on which a sealing surface is formed, which forms a sealing seat at the projecting into the combustion chamber end of the Dusenkorpers 8.
  • a plurality of spray holes are closed in the Dusenkorper 8.
  • the nozzle needle tip 11 lifts from its seat, then high-pressure fuel through the injection holes injected into the combustion chamber of the internal combustion engine.
  • control valve 12 which is also referred to as a metering valve.
  • a pressure shoulder 14 is formed, which is arranged in a pressure chamber 15 which extends in the nozzle body 8 and the Injektorkor- by 7.
  • the nozzle needle 10 is biased by a compression spring 16 with its tip 11 against the Dusenkorper 8.
  • flats 17, 18 are formed, which allow the passage of fuel from the part of the pressure chamber 15 which is provided in the Injektorkorper 7, in the part of the pressure chamber 15 in which the pressure shoulder 14 is arranged.
  • a spring plate 19 or collar 19 is attached at the nozzle needle 10.
  • the compression spring 16 is clamped between the spring plate 19 and a control stub 20, which has a guide bore 21 for the end of the nozzle needle 10 remote from the combustion chamber.
  • the combustion chamber remote end face of the nozzle needle 10 is limited in the control piece 20 a control chamber 22.
  • the control chamber 22 is connected via a connecting channel 24 having a throttle, with the pressure chamber 15 in connection.
  • the combustion chamber remote end of the Steuer- Stuck 20 is to form a sealing seat to the combustion chamber near the end of a Ventilstucks 30.
  • the valve stucco 30 in turn rests against the injector body 7 to form a sealing seat 31.
  • a pressure chamber 32 is recessed, which communicates with the control chamber 22 via a connecting channel 34 which is provided in the valve member 20 and equipped with a throttle.
  • the pressure chamber 32 is connected via a further connecting channel 35, which is provided in the valve piece 30 and equipped with a throttle, with the pressure chamber 15 in connection.
  • a valve piston 38 is guided reciprocally movable.
  • the combustion chamber near the end of the valve piston 38 is located at the combustion chamber remote end face of the control piece 20 to form a sealing seat 39.
  • Within the sealing seat 39 opens a central through hole 40 which is provided in the valve piston 38.
  • the central through-hole 40 opens at its end remote from the combustion chamber into a pressure relief chamber 41 which, as indicated by an arrow 42, communicates with a fuel collecting container (not shown).
  • the valve piston 38 is biased by a spring 43 toward the combustion chamber, so that the provided at the combustion chamber near the end of the valve piston 38 sealing seat 39 is closed.
  • a magnet armature 44 is fixed, which cooperates with an electromagnet 45.
  • the electromagnet 45 is energized, then the armature 44 is attracted to the electromagnet 45, so that the sealing seat 39 opens at the combustion chamber near the end of the valve piston 38.
  • the sealing seat 39 opens, the pressure Chamber 32 and via the connecting channel 34 also the control chamber 22 depressurized.
  • the nozzle needle 10 of the illustrated in Figure 1 Kraftstoffinj ector 1 includes a combustion chamber near the nozzle portion 51 which is materially connected to a combustion chamber distant nozzle needle portion 52.
  • thin compensating webs 53 to 56 which act like a cardan joint, are provided in the nozzle needle section 52.
  • a two-part nozzle needle / control rod combination can be used, wherein the nozzle needle and the control rod are connected to each other either mechanically or hydraulically.
  • the connecting channel 24 represents an inlet channel for the control chamber 22.
  • the associated throttle is also referred to as inlet throttle.
  • the connecting duct 34 represents a drainage channel.
  • the associated throttle is also referred to as a drainage throttle.
  • the connecting channel 35 with the associated throttle is optional and allows when closing the nozzle needle 10, a filling of the control chamber 22 via the outlet throttle in the drain passage 34. Thus, the closing speed of the nozzle needle 10 can be increased. Additional spring or holding elements may be provided. be seen to fix the valve member 30 in its rest position.
  • FIG. 2 shows a fuel injector 61 is shown schematically in longitudinal section, which is similar to the fuel injector 1 of Figure 1.
  • the same reference numerals are used. To avoid repetition, reference is made to the preceding description of FIG. In the following, the differences between the two embodiments are mainly discussed.
  • the part of the pressure chamber 15 in which the pressure shoulder 14 is arranged communicates via a pressure connection channel 62 with the part of the pressure chamber 15 which is arranged in the injector body 7.
  • the nozzle needle 10 is equipped with a nozzle needle extension 62, which is coupled to the nozzle needle 10 by means of a hydraulic coupler 64.
  • the hydraulic coupler 64 comprises a coupler sleeve 65, in which the combustion chamber near the end of the nozzle needle extension 63 is guided.
  • the coupler sleeve 65 is biased against the nozzle body 8 by means of a spring 66, which is supported on a collar 67 of the nozzle needle extension 63.
  • the fuel injector 61 shown in FIG. 2 comprises a control valve 12 with a valve piece 70.
  • the valve piece 70 has a guide section 71 close to the combustion chamber and a sealing section 72 remote from the combustion chamber.
  • the valve piece 70 has a guide bore 74 on, in which the combustion chamber remote end of the nozzle needle 10 and the Dusennadelverrascherung 63 is guided.
  • the combustion chamber remote end face of the nozzle needle 10 and the Dusennadelverrascherung 63 limited in the Ventilstuck 70 a control chamber 75.
  • the control chamber 75 is connected via a connecting channel 76 which is equipped with a throttle, with the pressure chamber 15 in connection.
  • the control chamber 75 is connected via a further connecting channel 77, which is also equipped with a throttle, with a pressure chamber 78 in connection, which has the shape of a blind hole from which a further connecting channel 79, which is also equipped with a throttle, in the Pressure chamber 15 extends.
  • the pressure chamber 78 forming blind hole is closed at its combustion chamber remote end by a valve ball 80.
  • the valve ball 80 is held by the biasing force of a spring 81 in abutment against the combustion chamber remote opening of the pressure chamber 78.
  • a magnet armature 82 is arranged, on which the valve ball 80 is fixed.
  • the armature 82 cooperates with an electromagnet 83 and is arranged in a pressure relief space 85.
  • the pressure relief space 85 as indicated by an arrow 86, communicates with a Kraftstoffsam- melbehalter.
  • the control valve 12 designed as a ball valve is closed.
  • the electromagnet 83 When the electromagnet 83 is energized, then the magnet armature 82 is attracted with the valve ball 80 to the solenoid 83, so that the valve ball 80 lifts from its associated valve seat at the combustion chamber distal end of the pressure chamber 78. Then, the pressure chamber 78 and the connecting channel 77 of the control chamber 75 is relieved, so that the nozzle needle 10 lifts with its tip 11 from the associated valve seat.
  • a nozzle needle 90 is arranged in an injector housing 91 which is supplied with fuel via a feed line 92, which enters a pressure chamber 94 in the interior of the injector housing 91.
  • the opening and closing of the nozzle needle 90 is controlled by a valve device 95 comprising a valve stub 100.
  • Valve Stuck 100 is inserted into the injector housing 91 from the combustion chamber end and seals via a flat sealing seat 102 to the injector housing.
  • the sealing seat 102 is held closed by a spring 103.
  • a control chamber 101 is formed, which is delimited by the combustion chamber distal end of the nozzle needle 90.
  • the control chamber 101 is connected via a connecting channel 104, which has a throttle, with the pressure chamber 94 in connection.
  • the control chamber 101 is connected via a further connecting channel 105, which is also equipped with a throttle, with a space which is bounded within a sealing seat 106 by a magnet armature 108.
  • the armature 108 is by a spring 109 against the valve Stuck 100th biased so that the sealing seat 106 is closed.
  • the sealing seat 106 is opened.
  • a balance piston 112 is received.
  • a connection is released from the control chamber 101 via the connection channel 105 into a pressure relief space 115.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un injecteur de carburant doté d'un boîtier d'injecteur (6), qui comporte une chambre de pression (15), de laquelle du carburant alimenté à haute pression en fonction de la pression dans une chambre de commande (22) est injecté dans une chambre de combustion d'un moteur à combustion interne, lorsque la pression dans la chambre de commande (22) est abaissée à l'aide d'un dispositif de valve de commande (12) de façon à ouvrir une aiguille de buse (10). Afin de fournir un injecteur de carburant à structure simple et pouvant être fabriqué de manière économique, la chambre de pression (15) est fermée au niveau de son extrémité éloignée de la chambre de combustion par une valve (30), qui présente une surface étanche ou une arête étanche opposée à la chambre de combustion, qui s'appuie contre le boîtier d'injecteur (6).
EP07729829A 2006-07-24 2007-06-04 Injecteur de carburant Withdrawn EP2047095A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006034112A DE102006034112A1 (de) 2006-07-24 2006-07-24 Kraftstoffinjektor
PCT/EP2007/055441 WO2008012132A1 (fr) 2006-07-24 2007-06-04 Injecteur de carburant

Publications (1)

Publication Number Publication Date
EP2047095A1 true EP2047095A1 (fr) 2009-04-15

Family

ID=38420563

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07729829A Withdrawn EP2047095A1 (fr) 2006-07-24 2007-06-04 Injecteur de carburant

Country Status (4)

Country Link
US (1) US20090206183A1 (fr)
EP (1) EP2047095A1 (fr)
DE (1) DE102006034112A1 (fr)
WO (1) WO2008012132A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008001175A1 (de) * 2008-04-14 2009-10-15 Robert Bosch Gmbh Ventilbauteil sowie Ventil

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19826791A1 (de) * 1998-06-16 1999-12-23 Bosch Gmbh Robert Ventilsteuereinheit für ein Kraftstoffeinspritzventil
US6270024B1 (en) * 2000-01-12 2001-08-07 Woodward Governor Company Hydraulically actuated fuel injector cartridge and system for high pressure gaseous fuel injection
DE10101802A1 (de) * 2001-01-17 2002-07-18 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten
JP4158501B2 (ja) * 2002-03-06 2008-10-01 株式会社デンソー 蓄圧式燃料噴射装置
US7891584B2 (en) * 2005-04-14 2011-02-22 Ganser-Hydromag Ag Fuel injection valve
DE102007002760A1 (de) * 2007-01-18 2008-07-24 Robert Bosch Gmbh Kraftstoffinjektor mit integriertem Druckverstärker

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008012132A1 *

Also Published As

Publication number Publication date
WO2008012132A1 (fr) 2008-01-31
US20090206183A1 (en) 2009-08-20
DE102006034112A1 (de) 2008-01-31

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