EP1980742A1 - Injecteur de carburant doté d'un amplificateur de pression intégré - Google Patents

Injecteur de carburant doté d'un amplificateur de pression intégré Download PDF

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Publication number
EP1980742A1
EP1980742A1 EP08101824A EP08101824A EP1980742A1 EP 1980742 A1 EP1980742 A1 EP 1980742A1 EP 08101824 A EP08101824 A EP 08101824A EP 08101824 A EP08101824 A EP 08101824A EP 1980742 A1 EP1980742 A1 EP 1980742A1
Authority
EP
European Patent Office
Prior art keywords
valve
piston
pressure
seat
chamber
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.)
Granted
Application number
EP08101824A
Other languages
German (de)
English (en)
Other versions
EP1980742B1 (fr
Inventor
Juergen Frasch
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 EP1980742A1 publication Critical patent/EP1980742A1/fr
Application granted granted Critical
Publication of EP1980742B1 publication Critical patent/EP1980742B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
    • 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

Definitions

  • the second control valve which controls the differential pressure chamber of the pressure intensifier, is a 3/2-way valve with a flat seat / slide seat.
  • a control valve for a fuel injector having a valve seat formed by a conical valve seat surface formed on a valve piston is off DE 199 40 300 A1 known.
  • the valve piston with the conical valve seat surface in a pressurized with high pressure valve chamber.
  • the object of the present invention is to provide a control valve whose valve seat holding a control volume of the pressure intensifier is exposed to no or only very little cavitation erosion.
  • the valve piston of the second control valve has a first piston section, a second piston section designed with a smaller diameter and a third piston section, wherein the conical sealing surface for the valve piston seat is formed on the third piston section.
  • the diameter of the second valve seat on the valve piston seat and the diameter of the first piston portion, with which the valve piston is guided in the housing substantially same size.
  • the valve seat is closed when the control valve is de-energized.
  • the control valve has an electromagnetic actuator with a plunger armature.
  • FIG. 1 a sectional view through a fuel injector and FIG. 2 an enlarged section X of the second control valve in FIG. 1 ,
  • the in FIG. 1 shown fuel injector has a housing 10 with, for example, a first housing part 11, a second housing part 12, a third housing part 13, a fourth housing part 14 and a connecting part 15 and a nozzle body 16.
  • the nozzle body 16, the housing part 14 and the housing part 13 are clamped hydraulically tight by means of a nozzle lock nut 17.
  • the nozzle body 16 includes an injection valve member 20 having a nozzle needle 21 which is guided axially displaceably in the nozzle body 16.
  • the nozzle needle 21 cooperates with a non-illustrated nozzle nozzle 16 formed on the nozzle needle sealing seat, which separates a nozzle needle pressure chamber 22 in the closed state of the nozzle needle 21 of injection openings 23.
  • a control chamber sleeve 24 is guided, which presses by means of a compression spring 25 against a sealing surface and thereby encloses a control chamber 26.
  • the control chamber 26 is exposed to the nozzle needle 21 with a control surface 27 acting in the closing direction.
  • a high-pressure bore 18 is arranged, which leads into the nozzle needle pressure chamber 22.
  • the housing 10 further comprises, for example, on the housing part 12 a high pressure port 19 with a high pressure supply line 29, with which the fuel injector is connected to a common rail of a diesel injection device.
  • the fuel injector further comprises a first control valve 40 designed as a servo valve and a second control valve 50 likewise designed as a servo valve.
  • the first control valve 40 is a 2/2-way valve and comprises a first electromagnetic control element 41, which controls the control chamber by means of a first valve piston 43 26 is controlled by the control chamber 26 is connected to a first low pressure chamber 46 and from there via hydraulic connections 48 to a first return port 49 which is hydraulically in communication with a first low pressure / return system. Via the first return connection 49, the control quantity of the control chamber 26 of the nozzle needle 21 switched by the first control valve 40 is discharged into the first low-pressure / return system.
  • the second control valve 50 is a 3/2-way valve and includes a second electromagnetic actuator 51 with a second valve piston 52.
  • the second valve piston 52 has according to FIG. 2 a first piston portion 52.1 a second piston portion 52.2 and a third piston portion 52.3.
  • the valve piston 52 is guided with the first piston portion 52.1 in a housing part of the housing 10.
  • the electromagnetic actuator 51 comprises a magnetic coil 53 which is enclosed by an upper magnetic disk 53.1 and by a lower magnetic disk 53.2.
  • the valve piston 52 is connected to a magnetic armature 54, wherein the valve piston 52 is guided by the lower magnetic disk 53.2, so that the magnet armature 54 is enclosed by the magnetic coil 53 and thereby forms a so-called plunger armature.
  • the control valve 50 has a first valve seat 55 and a second valve seat 56.
  • the first valve seat 55 is formed by a slide edge 57 formed between the first piston section 52. 1 and the smaller diameter piston section 52. 2, which cooperates with a control edge 58 on the housing side.
  • the second valve seat 56 is formed by a valve piston 52 formed on the conical sealing surface 70 and a housing-side valve piston seat 71, wherein the conical sealing surface 70 between the second piston portion 52.2 and the one larger diameter third piston portion 52.3 runs. As a result, a so-called A-seat is formed.
  • the valve piston 52 is exposed to the slide edge 57 a high pressure chamber 61 and with the conical sealing surface 70 of a valve chamber 62 and a low pressure chamber 63.
  • a leakage chamber 68 of the second control valve 50 From the first low-pressure chamber 46 of the first control valve 40 lead through the individual housing parts 11, 12, 13, 14 different unspecified further hydraulic connections to a leakage chamber 68 of the second control valve 50.
  • the leakage chamber 68 expands in the second actuator 51 to the second valve piston 52 off.
  • a bypass channel 74 is arranged, so that the two hydraulic chambers are hydraulically connected.
  • the armature 54 When energizing the solenoid 53 of the second control valve 50, the armature 54 is moved in the direction of the lower magnetic disk 53.2, so that the second valve seat 56 opens and at the same time the slide edge 57 closes the first valve seat 55.
  • the valve chamber 62 is hydraulically separated from the high-pressure chamber 61 and at the same time the valve chamber 62 is hydraulically connected to the low-pressure chamber 63.

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)
EP08101824A 2007-04-13 2008-02-21 Injecteur de carburant doté d'un amplificateur de pression intégré Not-in-force EP1980742B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007018040A DE102007018040A1 (de) 2007-04-13 2007-04-13 Kraftstoffinjektor mit integriertem Druckverstärker

Publications (2)

Publication Number Publication Date
EP1980742A1 true EP1980742A1 (fr) 2008-10-15
EP1980742B1 EP1980742B1 (fr) 2011-07-27

Family

ID=39643195

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08101824A Not-in-force EP1980742B1 (fr) 2007-04-13 2008-02-21 Injecteur de carburant doté d'un amplificateur de pression intégré

Country Status (3)

Country Link
EP (1) EP1980742B1 (fr)
AT (1) ATE518057T1 (fr)
DE (1) DE102007018040A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008002474A1 (de) 2008-06-17 2009-12-24 Robert Bosch Gmbh Ventilsitz für Kraftstoffinjektor
DE102011004640A1 (de) * 2011-02-24 2012-08-30 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor sowie Kraftstoffinjektor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004088121A1 (fr) * 2003-04-02 2004-10-14 Robert Bosch Gmbh Injecteur de carburant comportant une soupape asservie libre de fuites
DE10334771A1 (de) 2003-07-30 2005-02-24 Robert Bosch Gmbh Schaltventil mit Druckausgleich für einen Kraftstoffinjektor mit Druckverstärker
DE10335340A1 (de) 2003-08-01 2005-02-24 Robert Bosch Gmbh Steuerventil für einen Druckübersetzer enthaltenden Kraftstoffinjektor
DE102005057526A1 (de) 2004-12-02 2006-07-13 Denso Corp., Kariya Steuerventil und Kraftstoffeinspritzventil mit diesem

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19940300A1 (de) 1999-08-25 2001-03-01 Bosch Gmbh Robert Steuerventil für einen Injektor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004088121A1 (fr) * 2003-04-02 2004-10-14 Robert Bosch Gmbh Injecteur de carburant comportant une soupape asservie libre de fuites
DE10334771A1 (de) 2003-07-30 2005-02-24 Robert Bosch Gmbh Schaltventil mit Druckausgleich für einen Kraftstoffinjektor mit Druckverstärker
DE10335340A1 (de) 2003-08-01 2005-02-24 Robert Bosch Gmbh Steuerventil für einen Druckübersetzer enthaltenden Kraftstoffinjektor
DE102005057526A1 (de) 2004-12-02 2006-07-13 Denso Corp., Kariya Steuerventil und Kraftstoffeinspritzventil mit diesem

Also Published As

Publication number Publication date
ATE518057T1 (de) 2011-08-15
EP1980742B1 (fr) 2011-07-27
DE102007018040A1 (de) 2008-10-16

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