WO2008061844A1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
WO2008061844A1
WO2008061844A1 PCT/EP2007/060757 EP2007060757W WO2008061844A1 WO 2008061844 A1 WO2008061844 A1 WO 2008061844A1 EP 2007060757 W EP2007060757 W EP 2007060757W WO 2008061844 A1 WO2008061844 A1 WO 2008061844A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
control
control sleeve
fuel injector
injector according
Prior art date
Application number
PCT/EP2007/060757
Other languages
German (de)
English (en)
Inventor
Holger Rapp
Friedrich Boecking
Andreas Rettich
Markus Rueckle
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 WO2008061844A1 publication Critical patent/WO2008061844A1/fr

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
    • 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
    • F02M63/0014—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
    • 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
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0077—Valve seat details
    • 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
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston

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:
  • valve pin By using three components (valve pin, control sleeve with anchor and
  • Valve disc results in a very simple solution for the control valve.
  • the high pressure in the valve pin reduces the guide clearance between the valve pin and the control sleeve and thus the leakage by up to 50-70%.
  • the guide clearance is increased due to the reduced pressure, which provides additional security against friction.
  • a designed as a flat seat valve control valve allows a very compact solution with a very steep flow characteristic.
  • a force balanced valve By using a force balanced valve, a very narrow piezoactuator specially grown for stroke can be used. It is advantageous to combine the valve with a hydraulic translator. Since hardly any force is required from the piezoactuator, it can be very small in diameter.
  • Fig. 1 shows a first embodiment of the fuel injector according to the invention
  • Fig. 2 shows a second embodiment of the invention
  • FIG. 3 shows a third embodiment of the fuel injector according to the invention
  • Fig. 5 shows a fifth embodiment of the fuel injector according to the invention
  • Fig. 6 shows a sixth embodiment of the invention
  • Fuel injector (EM 2006/0012).
  • 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 a conventional manner a projecting 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 connected to a high-pressure inlet line (high pressure side) 5.
  • a control valve 6 in the form of a 2/2-way valve is provided, 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 inlet line 5 may be connected to a high-pressure accumulator (common rail), not shown, and the low-pressure drain line 7 with leak oil.
  • 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 comprises a fixed valve pin 9 and a force-balanced control sleeve 10, which is displaceably guided on the forth from the nozzle needle 3 directed free end of the valve pin 9 between two valve positions.
  • the valve pin 9 has a coming from the control chamber 2 inner discharge channel 11, which opens into an inside annular groove 12 of the control sleeve 10.
  • the control sleeve 10 has an upwardly adjoining the annular groove 12 sealing surface which cooperates with a conical valve seat 13 of the valve pin 9, the seat opening is connected to the low pressure side 7.
  • the control sleeve 10 closes in its one, shown in Figure 1 closed valve position, the annular groove 12 to the outside and opens in its other open valve position, the compound of the annular groove 12 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) 14 connected and formed in the valve pin 9 through a longitudinal bore 15 and thereof to the annular groove 12 outgoing transverse bores 16.
  • the control sleeve 10 is biased by a housing-side supported closing spring 17 in its closed valve position and by means of a magnetic coil 18 whose magnetic field acts on a disc-shaped armature 19 of the control sleeve 10, slidable into its open valve position.
  • the armature 19 is provided at the upper end of the control sleeve 10.
  • valve member 8 and a valve disc 20 are clamped in a bore of an injector body 21 by means of a valve clamping screw 22, whereby the guided in the valve disc 20 valve pin 9, which has an overlapped by the valve disc 20 annular shoulder 23 at the lower end, clamped to the injector 21 is.
  • the magnetic coil 18 with its magnetic core 24 are arranged in the interior of a magnetic sleeve 25, which is fastened by means of a magnetic clamping nut 26 on the injector 21.
  • the control sleeve 10 In its closed valve position shown in FIG. 1, the control sleeve 10 bears against the conical valve seat 13 of the valve pin 9.
  • the opening diameter d of the valve seat 13 is equal to the guide diameter D of the free end of the valve pin 9, whereby the control sleeve 10 is force-balanced.
  • the connection of the control chamber 2 to the low pressure side 7 is closed by the annular groove 12 occluding control sleeve 10 and therefore the nozzle needle 3 closed by the pressure prevailing in the control chamber 2 high pressure.
  • the control sleeve 10 is from Valve seat 13 in the direction of the free end of the valve pin 9, ie pulled up, in its open valve position, whereby the pressure in the control chamber 2 is reduced and the nozzle needle 3 opens. Since the control sleeve 10 is force balanced, only small forces are needed to open the control sleeve 10. The control sleeve 10 makes only a very small opening stroke of about 18-25 microns. When open control sleeve 10, the A-restrictor 14 limits the flow. If the energization of the solenoid 18 is released, the control sleeve 10 is moved over the closing spring 17 down to its closed valve position and filled the control chamber 2 via the Z-throttle 4 again.
  • the valve seat 13 directs the control quantity from the annular groove 12 via the seat opening into the drain 7a. In this case, deflection is hardly necessary, and the armature-side low-pressure chamber 7 is not burdened by the Ab Kunststoffst Congresse. In other words, caused by the running with the control sleeve 10 control valve 6 no damage due to flow deflections, since the deflection in the seating area is minimal, and the control amount can flow freely without disturbing the armature 19.
  • the fuel injector 1 shown in Fig. 2 differs in that here the valve seat 13 is a flat seat, whereby a control valve 6 with steep flow characteristic and valve lifts of 20-30 microns is made possible.
  • the Abgres fie is fed directly into the oil leakage and not by the armature 19.
  • the fuel injector 1 shown in Fig. 3 differs in that here the valve pin 9 is integrally formed with a perforated plate 27 which closes the injector body 21 above.
  • the pointing in the direction of the nozzle needle 3 free end of the valve pin 9 engages in a bore of the valve member 8 and is clamped therein by means of a plate spring 28.
  • the control sleeve 10 has a downwardly adjoining the annular groove 12 sealing surface which cooperates with the conical valve seat 13 of the valve pin 9, the seat opening on Longitudinal grooves 29 of the control sleeve 10 is connected to the low pressure side 7. Solenoid coil and core 18, 24 are in this solution under the armature 19.
  • the control sleeve 10 If the solenoid coil 18 energized, the control sleeve 10 is pulled from the valve seat 13 in the direction of the free end of the valve pin 9, ie down to its open valve position, thereby the pressure in the control chamber 2 is reduced and the nozzle needle 3 opens. If the energization of the solenoid 18 is released, the control sleeve 10 is moved over the closing spring 17 back up into its closed valve position and filled the control chamber 2 via the Z-throttle 4 again.
  • the fuel injector 1 shown in Fig. 4 differs in that here the control sleeve 12 via a hydraulic booster 30, which in turn is controlled by a piezoelectric actuator 31, is opened.
  • the hydraulic booster 30 comprises two interengaging pistons 33, 34 which are reciprocally coupled in motion by a fluid-filled booster chamber 32.
  • the piezoactuator 31 acts on the outer piston 33, and the inner piston 34 is formed integrally with the control sleeve 10. In the closed valve position shown, the piezoelectric actuator 31 is not energized and thus shortened, whereby the outer piston 33 is displaced upwards and thus the inner piston 34 and the control sleeve 10 are displaced downwards into the closed valve position.
  • the piezoelectric actuator 31 If the piezoelectric actuator 31 is energized, it extends against the action of a tubular spring 35, whereby the outer piston 33 is pushed down and thus the inner piston 34 and the control sleeve 10 are moved upwards in the open valve position. If the piezoelectric actuator 31 is no longer energized, the control sleeve 10 is moved back to its closed valve position via the closing spring 17 supported on the outer piston 34 and the control chamber 2 is filled again via the Z-throttle 4. Since hardly force is demanded from the piezoelectric actuator 31, it can be made very small in diameter.
  • the fuel injector 1 shown in Fig. 5 differs in that here the two pistons 33, 34 do not interlock, but instead are coupled to each other in the same direction by the intermediary fuel-filled interrupter space 32 and guided in a translator housing 37 slidably. If the piezoelectric actuator 31, which is indicated only schematically here, is supplied with current, it is extended, and the upper piston 33 is pushed downward, as a result of which the lower piston 34 or the control sleeve 10 moves upward into the open position
  • Valve position to be moved If the piezoelectric actuator 31 is no longer energized, the control sleeve 10 is moved back to its closed valve position via the closing spring 17 supported on the upper piston 33 and the control chamber 2 is filled again via the Z-throttle 4.
  • the fuel injector 1 shown in FIG. 6 differs from the injector of FIG. 5 in that the normally actuated piezoactuator 31 lifts the control sleeve 10 from the valve seat 13 of the valve pin 9 when energized via bolts 38 which pass through the perforated disk 37.
  • the piezoelectric actuator 31 may be hydraulically translated or have a temperature compensation via the housing. If the piezoelectric actuator 31 is no longer energized, the control sleeve 10 is moved back to its closed valve position via the closing spring 17 supported on the valve piece 18 and the control chamber 2 is filled again via the Z-throttle 4.

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  • 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

Injecteur de carburant (1) pour moteurs à combustion interne, avec une chambre de commande (2) qui est raccordée à un côté haute pression (5) et dont la pression commande le déplacement d'un pointeau (3), et avec une soupape de commande (6) qui ferme ou ouvre la liaison de la chambre de commande (2) vers un côté basse pression (7). Selon l'invention, la soupape de commande (6) présente un axe de soupape fixe (9) et une douille de commande (10) à force équilibrée, guidée en coulissement sur cet axe entre une position de soupape fermée et une position de soupape ouverte. L'axe de soupape (9) présente un canal intérieur de décharge (11) provenant de la chambre de commande (2) et débouchant dans une rainure annulaire (12) sur le côté intérieur de la douille de commande (10). La douille de commande (10) présente une surface d'étanchéité se raccordant dans la direction d'ouverture à la rainure annulaire (12) et coopérant avec un siège de soupape (13) de l'axe de soupape (9) dont l'ouverture de siège est raccordée au côté basse pression (7).
PCT/EP2007/060757 2006-11-24 2007-10-10 Injecteur de carburant WO2008061844A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610055548 DE102006055548A1 (de) 2006-11-24 2006-11-24 Kraftstoffinjektor
DE102006055548.1 2006-11-24

Publications (1)

Publication Number Publication Date
WO2008061844A1 true WO2008061844A1 (fr) 2008-05-29

Family

ID=38826418

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/060757 WO2008061844A1 (fr) 2006-11-24 2007-10-10 Injecteur de carburant

Country Status (2)

Country Link
DE (1) DE102006055548A1 (fr)
WO (1) WO2008061844A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008128884A1 (fr) * 2007-04-19 2008-10-30 Robert Bosch Gmbh Injecteur de carburant avec électrovanne
WO2008138743A1 (fr) * 2007-05-14 2008-11-20 Robert Bosch Gmbh Injecteur
EP1983186A3 (fr) * 2007-04-16 2009-01-07 Robert Bosch GmbH Elément de commande à compensation de pression
US9297473B2 (en) 2011-09-28 2016-03-29 Nabtesco Corporation Solenoid valve with armature guide

Families Citing this family (4)

* 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
DE102007047129A1 (de) * 2007-10-02 2009-04-09 Robert Bosch Gmbh Injektor mit hülsenförmigem Steuerventilelement
DE102010030401A1 (de) * 2010-06-23 2011-12-29 Robert Bosch Gmbh Kraftstoffinjektor
DE102013211855A1 (de) 2013-06-21 2014-12-24 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1612403A1 (fr) * 2004-06-30 2006-01-04 C.R.F. Societa' Consortile per Azioni Soupape servo pour controller l'injecteur d'un moteur à combustion interne
EP1612405A1 (fr) * 2004-06-30 2006-01-04 C.R.F. Societa' Consortile per Azioni Système d'injection de carburant pour moteur à combustion interne
DE102004041172B3 (de) * 2004-08-25 2006-01-05 Siemens Ag Einspritzventil
EP1621764A1 (fr) * 2004-06-30 2006-02-01 C.R.F. Società Consortile per Azioni Injecteur d'un moteur à combustion interne

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1612403A1 (fr) * 2004-06-30 2006-01-04 C.R.F. Societa' Consortile per Azioni Soupape servo pour controller l'injecteur d'un moteur à combustion interne
EP1612405A1 (fr) * 2004-06-30 2006-01-04 C.R.F. Societa' Consortile per Azioni Système d'injection de carburant pour moteur à combustion interne
EP1621764A1 (fr) * 2004-06-30 2006-02-01 C.R.F. Società Consortile per Azioni Injecteur d'un moteur à combustion interne
DE102004041172B3 (de) * 2004-08-25 2006-01-05 Siemens Ag Einspritzventil

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1983186A3 (fr) * 2007-04-16 2009-01-07 Robert Bosch GmbH Elément de commande à compensation de pression
WO2008128884A1 (fr) * 2007-04-19 2008-10-30 Robert Bosch Gmbh Injecteur de carburant avec électrovanne
WO2008138743A1 (fr) * 2007-05-14 2008-11-20 Robert Bosch Gmbh Injecteur
US9297473B2 (en) 2011-09-28 2016-03-29 Nabtesco Corporation Solenoid valve with armature guide

Also Published As

Publication number Publication date
DE102006055548A1 (de) 2008-05-29

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