EP2084392A1 - Injecteur de carburant - Google Patents

Injecteur de carburant

Info

Publication number
EP2084392A1
EP2084392A1 EP07820246A EP07820246A EP2084392A1 EP 2084392 A1 EP2084392 A1 EP 2084392A1 EP 07820246 A EP07820246 A EP 07820246A EP 07820246 A EP07820246 A EP 07820246A EP 2084392 A1 EP2084392 A1 EP 2084392A1
Authority
EP
European Patent Office
Prior art keywords
valve
fuel injector
valve pin
control chamber
injector according
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Withdrawn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
EP07820246A
Other languages
German (de)
English (en)
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 EP2084392A1 publication Critical patent/EP2084392A1/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Withdrawn legal-status Critical Current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
    • 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
    • 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
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F02M63/008—Hollow valve members, e.g. members internally guided
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators

Definitions

  • the invention relates to a fuel injector according to the preamble of patent claim 1.
  • the fuel injector according to the invention with its force-balanced control sleeve has, depending on the design, one or more of the following advantages:
  • Control sleeve is guided, represents a simple compact solution
  • a very narrow piezoactuator can be used, which is specially bred to stroke. Since hardly any force is required from the piezoactuator, it can be very small in diameter;
  • valve pin To improve the strength of the transverse bores of the valve pin can be eccentrically offset with respect to its longitudinal bore and / or arranged in height.
  • the required high-pressure resistance can be achieved with a significantly smaller valve pin diameter, which reduces the guide leakage on the valve pin square.
  • Fig. 1 shows a first embodiment of the fuel injector according to the invention
  • 3 shows a third embodiment of the fuel injector according to the invention
  • 4 shows a fourth embodiment of the fuel injector according to the invention
  • FIG. 5 shows a fifth embodiment of the fuel injector according to the invention
  • FIGS. 6a-6c modifications to the valve pin of the in Fig. 1 to 5 fuel injectors shown.
  • Fig. 7 shows a further modification to the valve pin of FIGS. 1 to 5 shown
  • the fuel injector 1 shown in Fig. 1 is usually used in an internal combustion engine having a plurality of cylinders, wherein each of these cylinders is associated with such an injector (fuel injection valve).
  • This injector has in known manner a protruding into a cylinder combustion chamber of the internal combustion engine, not shown here injector and the injector depending on the pressure in a control chamber 2 opening and closing, here indicated only to a small extent nozzle needle 3.
  • the control chamber 2 is connected via an inlet throttle (Z-throttle) 4 permanently to a high-pressure inlet line (high pressure side) 5 of the fuel.
  • a control valve 6 is provided in the form of a 2/2-way valve, which opens or blocks the connection of the control chamber 2 with a low-pressure chamber (low-pressure side) 7, which is connected to a drain 7a.
  • the high-pressure feed line 5 may be connected to a high-pressure accumulator, not shown (common rail).
  • the nozzle needle 3 is guided to form the control chamber 2 in a valve piece 8, in which the Z-throttle 4 is provided.
  • the control valve 6 has a fixed valve pin 9 with a coming from the control chamber 2 and opening into an annular groove 10 of the valve pin 9 inner discharge channel 11 and surrounded by the low-pressure chamber 7 - A -
  • Control sleeve 12 which is slidably guided on the projecting into the low-pressure chamber 7 free end of the valve pin 9 between two valve positions.
  • the control sleeve 12 closes in one closed valve position shown in Figure 1, the annular groove 10 to the outside and opens in the other, open valve position, the compound of the annular groove 10 to the low pressure side 7.
  • the discharge channel 11 is connected to the control chamber 2 via a valve in the piece. 8 provided outlet throttle (A-throttle) 13 connected and formed in the valve pin 9 by a longitudinal bore 14 and thereof to the annular groove 10 outgoing transverse bores 15.
  • the transverse bores 15 of the valve pin 9 go centric and not offset in height from the longitudinal bore 14 from.
  • the control sleeve 12 is biased by a housing side supported closing spring 16 upwards in its closed valve position and by means of a magnetic coil 17 whose magnetic field acts on an armature plate 18 of the control sleeve 12, downwardly displaceable in its open valve position.
  • the armature disk 18 is provided at the upper end of the control sleeve 12.
  • the valve piece 8 is in a bore 19 of a
  • Injector body 20 clamped by means of a valve clamping screw 21.
  • the valve pin 9 is screwed with its lower end into a threaded bore 22 of the valve piece 8, wherein it bears sealingly against the valve piece 8 with a sealing seat 23.
  • the magnet coil 17 with its magnetic core 24 is likewise arranged in the bore 19 and fastened to the valve clamping screw 21 by means of screws 25 which are screwed into corresponding axial threaded bores 26 of the valve clamping screw 21.
  • the magnet coil 17 is arranged in the low-pressure space 7 between the valve clamping screw 21 and the armature disk 18.
  • the control sleeve 12 In its closed valve position shown in FIG. 1, the control sleeve 12 bears against a conical valve seat 27 of the valve pin 9.
  • the diameter d of the valve seat 27 is equal to the guide diameter D of the free end of the valve pin 9, whereby the control sleeve 12 is force-balanced.
  • the connection of the control chamber 2 to the low pressure side 7 is closed by the annular groove 10 occluding control sleeve 12 and therefore the nozzle needle 3 closed by the pressure prevailing in the control chamber 2 high pressure.
  • the fuel injector 1 shown in FIG. 2 differs from the fact that here the valve pin 9 is screwed into a holding plate (holding device) 28, which engages in the bore 19 of the valve clamping screw 21 and together with the valve piece. 8 is tense.
  • the valve pin 9 lies with its sealing seat 23 sealingly against the retaining disk 28.
  • the armature disk 18 is arranged at the upper end of the control sleeve 12 in the injector 1 shown in FIG. 2, the armature disk 18 is arranged at the lower end of the control sleeve 12.
  • the Abgresstoss on flat formed valve seat 27 is discharged directly into the leakage oil (low pressure chamber 7) and does not affect the armature movement.
  • the control sleeve 12 is opened via a hydraulic booster 30, which in turn is actuated by a piezoactuator 31.
  • the hydraulic booster 30 comprises two pistons 33, 34 coupled to each other by a fuel-filled booster chamber 32, the piezo actuator 31 acting on the upper piston 33 and the lower piston 34 is integrally connected to the control sleeve 12.
  • the piezo-actuator 31 is energized and thus extended, whereby the upper piston 33 is displaced down into the booster chamber 32 and thus the lower piston 34 and the control sleeve 12 are moved down into the closed valve position.
  • the piezoelectric actuator 31 is shortened, as a result of which the upper piston 33 is pushed upwards and thus also the lower piston 34 or the control sleeve 12 are displaced upward into the open valve position. Via an above the valve seat 27 provided bore 35 of the control sleeve 12 of the annular space 10 is now connected to the low-pressure chamber 7. Since hardly force is required from the piezo actuator 31, it can be made very small in diameter.
  • the fuel injector 1 shown in Fig. 4 differs in that here the valve pin 9 is not bolted to the valve piece 8, but below in a blind bore 40 of the valve member 8 and taken up in a blind bore 41 of an upper housing plate 42 and is supported therein by means of a plate spring 43 supported in the blind bore 40.
  • the housing plate 42 is fastened to the injector body 20 by means of a clamping nut 44.
  • valve pin 9 of the injector 1 shown in FIG. 5 is made in one piece with the upper housing plate 42, which is fastened to the injector body 20 by means of the clamping nut 44.
  • FIGS. FIGS. 6a to 6c show cross sections of modified valve bolts 9, in which one or more transverse bores 15 each depart eccentrically from the longitudinal bore 14.
  • the diameter of the longitudinal bore 14 is at least twice as large as the diameter of the transverse bore 15.
  • the two transverse bores 15 shown in FIG. 6a are eccentric and opposed to each other from the longitudinal bore 14.
  • the two transverse bores 15 shown in FIG. 6b descend eccentrically from the longitudinal bore 14 and at an angle of 90 °, wherein also an angle greater than 90 ° can be selected.
  • Fig. 6c only a single transverse bore 15 is provided which goes off eccentrically from the longitudinal bore 14. Fig.
  • valve pin 9 shows a modified valve pin 9, in which the two transverse bores 15 are offset in height by .DELTA.L.
  • the transverse bores 15 can be centered from the longitudinal bore 14 or analogous to FIGS. 6a to 6c each off eccentrically.
  • the high pressure resistance of the valve pin 9 can be optimized and so a significantly smaller valve pin diameter can be achieved, which reduces the guide leakage on the valve pin 9 square.

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)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un injecteur de carburant (1) pour des moteurs à combustion interne comprenant une chambre de commande (2) raccordée côté haute pression (5), dont la pression permet l'activation de l'aiguille d'injecteur (3), et une soupape de commande (6), qui obture ou libère la liaison entre la chambre de commande (2) et le côté basse pression (7). La soupape de commande (6) comprend un axe de soupape (9) fixe, lequel présente un canal de décharge (11) interne partant de la chambre de commande (2) et débouchant dans une rainure annulaire (10) de l'axe de soupape (9). La soupape de commande comprend également un manchon de commande (12) équilibré en force, dirigé de manière à pouvoir se déplacer sur l'extrémité de l'axe de soupape (9) opposée à la chambre de commande (3), ledit manchon fermant à l'extérieur la rainure annulaire (10) lorsque la soupape est fermée, et ouvrant la liaison entre la rainure annulaire (10) et le côté basse pression (7), lorsque la soupape est ouverte, position dans laquelle le manchon de commande (12) est déplacé en direction de la chambre de commande (2).
EP07820246A 2006-10-27 2007-09-17 Injecteur de carburant Withdrawn EP2084392A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610050812 DE102006050812A1 (de) 2006-10-27 2006-10-27 Kraftstoffinjektor
PCT/EP2007/059772 WO2008049699A1 (fr) 2006-10-27 2007-09-17 Injecteur de carburant

Publications (1)

Publication Number Publication Date
EP2084392A1 true EP2084392A1 (fr) 2009-08-05

Family

ID=38871727

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07820246A Withdrawn EP2084392A1 (fr) 2006-10-27 2007-09-17 Injecteur de carburant

Country Status (3)

Country Link
EP (1) EP2084392A1 (fr)
DE (1) DE102006050812A1 (fr)
WO (1) WO2008049699A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007038394A1 (de) * 2007-08-14 2009-02-19 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor
DE102008001597A1 (de) * 2008-05-06 2009-11-12 Robert Bosch Gmbh Kraftstoff-Injektor
US9464613B2 (en) 2008-06-27 2016-10-11 C.R.F. Societa Consortile Per Azioni Fuel injector equipped with a metering servovalve for an internal combustion engine
ATE487050T1 (de) 2008-06-27 2010-11-15 Fiat Ricerche Brennstoffeinspritzvorrichtung mit mess- servoventil für einen verbrennungsmotor
DE102008040161A1 (de) * 2008-07-04 2010-01-07 Robert Bosch Gmbh Magnetventil für einen Kraftstoff-Injektor sowie Kraftstoff-Injektor
DE102008041502A1 (de) * 2008-08-25 2010-03-04 Robert Bosch Gmbh Kraftstoffinjektor mit einem Magnetventil
DE102015202978A1 (de) * 2015-02-19 2016-08-25 Robert Bosch Gmbh Druckregelventil

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4428869C2 (de) * 1993-08-06 1997-08-07 Zexel Corp Magnetventil
GB9508623D0 (en) * 1995-04-28 1995-06-14 Lucas Ind Plc "Fuel injection nozzle"
ES2277229T3 (es) * 2004-06-30 2007-07-01 C.R.F. Societa Consortile Per Azioni Servovalvula para controlar el inyector de combustible de un motor de combustion interna.
EP1621764B1 (fr) * 2004-06-30 2007-11-07 C.R.F. Società Consortile per Azioni Injecteur d'un moteur à combustion interne

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008049699A1 *

Also Published As

Publication number Publication date
DE102006050812A1 (de) 2008-04-30
WO2008049699A1 (fr) 2008-05-02

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