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WO2008049671A1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
WO2008049671A1
WO2008049671A1 PCT/EP2007/059028 EP2007059028W WO2008049671A1 WO 2008049671 A1 WO2008049671 A1 WO 2008049671A1 EP 2007059028 W EP2007059028 W EP 2007059028W WO 2008049671 A1 WO2008049671 A1 WO 2008049671A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
valve pin
fuel injector
control
control sleeve
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
PCT/EP2007/059028
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 WO2008049671A1 publication Critical patent/WO2008049671A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F02M63/0024—Valves characterised by the valve actuating means electrical, e.g. using solenoid in combination with permanent magnet
    • 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:
  • three components valve pin, control sleeve with armature and valve disc
  • 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%.
  • a very narrow piezoactuator specially grown for stroke can be used. Since hardly any force is required from the piezoactuator, it can be very small in diameter; - To improve the strength of the transverse bores of the valve pin with respect to its longitudinal bore are offset eccentrically 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
  • 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. 7 shows a further modification to the valve pin of FIGS. 1 to 5 shown
  • Fig. 8 shows a sixth embodiment of the fuel injector according to the invention.
  • the fuel injector 1 shown in Fig. 1 is usually at a
  • each of which cylinder 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 to a high-pressure inlet line (high pressure side) 5 of the fuel.
  • Z-throttle inlet throttle
  • a control valve 6 in the form of a 2/2-way valve is provided, that the connection of the control chamber 2 with a low pressure chamber (low pressure side) 7, which is connected to a drain 7a, opens or blocks.
  • the high-pressure feed 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 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
  • 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 in its closed valve position and by means of a magnetic coil 17 whose magnetic field acts on a disc-shaped armature 18 of the control sleeve 12, slidable into its open valve position.
  • the armature 18 is provided at the upper end of the control sleeve 12.
  • the valve piece 8 and a valve disc 19 are braced in a bore of an injector body 20 by means of a valve clamping screw 21, whereby the guided in the valve disc 19 valve pin 9, which has an overlapped by the valve disc 19 annular shoulder 22 at the lower end, clamped to the injector body 20 is.
  • the magnetic coil 17 with its magnetic core 23 are arranged in the interior of a magnetic sleeve 24, which is fastened by means of a magnetic clamping nut 25 on the injector 20.
  • the control sleeve 12 If the magnetic coil 17 is energized, the control sleeve 12 is pulled from the valve seat 26 in the direction of the free end of the valve pin 9 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 12 is force balanced, only small forces are needed to open the control sleeve 12. The control sleeve 12 makes only a very small opening stroke of about 18-25 microns. When the control sleeve 12 is open, the A-throttle 13 limits the flow. If the energization of the solenoid 17 is released, the control sleeve 12 is moved back into its closed valve position via the closing spring 16 and the control chamber 2 is filled again via the Z-throttle 4.
  • valve disc 19 with respect to the valve pin 9 have a fairly large guide clearance 27, if at the annular shoulder 22 cross-edge of the valve disc 19 is sealed exactly ,
  • the prevailing in the longitudinal bore 14 high pressure causes a widening of the valve pin 9, resulting in a reduction of the guide clearance between the valve pin 9 and control sleeve 12 and a reduced by about 50-70% leakage.
  • the length of the longitudinal bore 14 should make up at least 1/2 to 2/3 of the guide length of the valve pin 9, so that a hydrostatic / dynamic bearing is formed in the region of the guide.
  • the fuel injector 1 shown in Fig. 2 differs in that here the valve pin 9 in the bore of the injector body 20 between the valve piece 8 and the valve clamping screw 21, the ring shoulder 22 of the valve pin 9 directly, i. without additional valve disc, engages over, is clamped, that the valve pin 9 has a flat valve seat 26 for the force-balanced control sleeve 12 and that the control sleeve 12 has a sealing surface surrounding its annular pressure chamber 28 which is limited by the valve pin 9 inwardly when the control sleeve is closed , Via longitudinal bores 29, the pressure chamber 28 is connected to the low-pressure side 7 above the armature disk 18.
  • the pressure surge occurring during opening of the control sleeve 12 (Abêt theory) is not dissipated via the armature disc 18, but via the pressure chamber 28 and the longitudinal bores 29, whereby the control sleeve 12 is not excited to vibrate.
  • the fuel injector 1 shown in Fig. 3 differs in that here the valve seat 26 is formed flat for the force-balanced control sleeve 12 and not on the valve pin 9, but on the Ventilusion19 is provided. Compared to Fig. 1, this valve seat 26 means a very simple solution when the valve disc 19 is clean plan and has a good angularity to the valve pin 9.
  • the fuel injector 1 shown in Fig. 4 differs in that here the armature disc 18 is not provided at the upper end of the force-balanced control sleeve 12, but in the region of the lower half sleeve and that the valve pin 9 and the control sleeve 12 in the magnet coil 17 or protrude into the magnetic core 23.
  • the control sleeve 12 has at its protruding end on the outside longitudinal slots 30 through which the low-pressure chamber 7 is connected to the drain 7a.
  • This offset anchor plate 18 results in a compact balanced solenoid valve.
  • valve pin 9 is formed integrally with the valve piece 8, which is clamped to the injector body 20 via the valve clamping screw 21.
  • the valve seat 26 for the force-balanced control sleeve 12 is formed flat and provided on the valve piece 8.
  • the control sleeve 12 is opened via a hydraulic translator 31, which in turn is controlled inversely by a piezo actuator 32.
  • the hydraulic booster 31 comprises two pistons 34, 35 which are coupled to one another by a fuel-filled booster chamber 33, wherein the piezoactuator 32 acts on the upper piston 34 and the lower piston 35 is integrally connected to the control sleeve 12.
  • the piezo-actuator 32 In the closed valve position shown, the piezo-actuator 32 is energized and thus extended, whereby the upper piston 34 is displaced against the action of a Bourdon tube 36 down into the booster chamber 33 and thus also the lower piston 35 and the control sleeve 12 down in the closed valve position are shifted. If the energization is canceled, the piezo actuator 32 is shortened, whereby the upper piston 34 is pushed over the tube spring 36 upwards and thus the lower piston 35 and the control sleeve 12 are moved upwards in the open valve position. Since hardly force is required from the piezo actuator 32, it can be made very small in diameter.
  • 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 from the longitudinal bore 14 eccentrically and at an angle of 90 °, wherein an angle greater than 90 ° can also be selected.
  • Fig. 6c only a single transverse bore 15 is provided which goes off eccentrically from the longitudinal bore 14. Fig.
  • FIG. 7 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.
  • valve pin 9 is mounted on both sides, namely at the bottom in a bore of the valve piece 8 and at the top in one

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 internes doté d'une chambre de commande (2) placée côté haute pression (5) et dont la pression commande le mouvement d'une aiguille d'injecteur (3), et d'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, selon l'invention, un axe de soupape (9), lequel présente un canal de décharge (11) interne partant de la chambre de commande (2) et s'étendant vers une rainure annulaire (10) de l'axe de soupape (9). La soupape de commande comprend également un manchon de commande (12) équilibré en forces, dirigé de manière à pouvoir se déplacer sur l'extrémité libre de l'axe de soupape (9), ledit manchon fermant à l'extérieur la rainure annulaire, lorsque la soupape est fermée, et libérant la liaison entre la rainure annulaire (10) et le côté basse pression (7), lorsque la soupape est en position ouverte, dans laquelle le manchon de commande (12) est déplacé dans le sens de l'extrémité libre de l'axe de soupape (9).
PCT/EP2007/059028 2006-10-27 2007-08-30 Injecteur de carburant Ceased WO2008049671A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610050810 DE102006050810A1 (de) 2006-10-27 2006-10-27 Kraftstoffinjektor
DE102006050810.6 2006-10-27

Publications (1)

Publication Number Publication Date
WO2008049671A1 true WO2008049671A1 (fr) 2008-05-02

Family

ID=38825527

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/059028 Ceased WO2008049671A1 (fr) 2006-10-27 2007-08-30 Injecteur de carburant

Country Status (2)

Country Link
DE (1) DE102006050810A1 (fr)
WO (1) WO2008049671A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010124464A1 (fr) * 2009-04-30 2010-11-04 Bosch Automotive Diesel Systems Co., Ltd. Soupape de réglage de pression et dispositif d'injection de carburant pour moteur à combustion interne
CN101614173B (zh) * 2008-06-27 2013-03-27 C.R.F.阿西安尼顾问公司 配备有计量伺服阀的内燃机用燃料喷射器

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008002605A1 (de) 2008-06-24 2009-12-31 Robert Bosch Gmbh Direkt betätigter Kraftstoffinjektor
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
DE102008041502A1 (de) * 2008-08-25 2010-03-04 Robert Bosch Gmbh Kraftstoffinjektor mit einem Magnetventil
DE102017213417A1 (de) * 2017-08-02 2019-02-07 Robert Bosch Gmbh Elektromagnetisch betätigbares Ventil und Kraftstoff-Hochdruckpumpe

Citations (3)

* 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
EP1621764A1 (fr) * 2004-06-30 2006-02-01 C.R.F. Società Consortile per Azioni Injecteur d'un moteur à combustion interne
EP1707798A1 (fr) * 2005-03-14 2006-10-04 C.R.F. Societa' Consortile per Azioni Soupape de dosage asservie réglable pour un injecteur de carburant ainsi que sa méthode de réglage

Patent Citations (3)

* 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
EP1621764A1 (fr) * 2004-06-30 2006-02-01 C.R.F. Società Consortile per Azioni Injecteur d'un moteur à combustion interne
EP1707798A1 (fr) * 2005-03-14 2006-10-04 C.R.F. Societa' Consortile per Azioni Soupape de dosage asservie réglable pour un injecteur de carburant ainsi que sa méthode de réglage

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101614173B (zh) * 2008-06-27 2013-03-27 C.R.F.阿西安尼顾问公司 配备有计量伺服阀的内燃机用燃料喷射器
WO2010124464A1 (fr) * 2009-04-30 2010-11-04 Bosch Automotive Diesel Systems Co., Ltd. Soupape de réglage de pression et dispositif d'injection de carburant pour moteur à combustion interne
CN103026044B (zh) * 2009-04-30 2015-03-25 罗伯特·博世有限公司 压力控制阀和用于内燃机的燃料喷射装置

Also Published As

Publication number Publication date
DE102006050810A1 (de) 2008-04-30

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