WO2001027462A1 - Injecteur d'un systeme a injection de carburant « common rail. » de moteurs a combustion interne avec equilibrage partiel des forces de l'aiguille d'injecteur - Google Patents

Injecteur d'un systeme a injection de carburant « common rail. » de moteurs a combustion interne avec equilibrage partiel des forces de l'aiguille d'injecteur Download PDF

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Publication number
WO2001027462A1
WO2001027462A1 PCT/DE2000/003593 DE0003593W WO0127462A1 WO 2001027462 A1 WO2001027462 A1 WO 2001027462A1 DE 0003593 W DE0003593 W DE 0003593W WO 0127462 A1 WO0127462 A1 WO 0127462A1
Authority
WO
WIPO (PCT)
Prior art keywords
control chamber
valve control
nozzle needle
valve
injector
Prior art date
Application number
PCT/DE2000/003593
Other languages
German (de)
English (en)
Inventor
Friedrich Boecking
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 WO2001027462A1 publication Critical patent/WO2001027462A1/fr

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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

Definitions

  • Iniektor for a common rail fuel injection system for internal combustion engines with partial force balancing of the nozzle needle
  • the invention relates to an injector for a common rail fuel injection system for internal combustion engines with a valve control chamber delimited by the end face of a valve piston which is operatively connected to a nozzle needle and which is connected via an inlet throttle to a high pressure connection and a fuel injection system according to the preamble of the independent claim 14th
  • the invention has for its object an injector for a Co ⁇ r ⁇ mcm rail fuel injection system and a common rail fuel injection system with short Provide tax times.
  • an injector for a common rail fuel injection system for internal combustion engines with a valve control chamber delimited by the end face of a valve piston which is operatively connected to a nozzle needle and which is connected via an inlet throttle to a high-pressure connection, the valve control chamber being connected to an external one Valve control space and an inner valve control space is divided, and wherein the inlet throttle is arranged between the outer valve control space and the inner valve control space.
  • the inner valve control chamber is delimited by a blind hole in the end face of the valve piston and a sleeve protruding into the blind hole, so that the division of the valve control chamber is achieved in a simple manner and the size of the inner valve control chamber can be easily adapted to changed structural conditions.
  • a variant of the invention provides that the sleeve is connected to a housing of the injector, so that the hydraulic forces acting on the sleeve internal forces of the Injector are and also the outer valve control chamber is sealed from the environment by the sleeve.
  • an outlet channel and an outlet throttle are arranged in the sleeve, so that the pressure relief of the inner valve control chamber can take place through the sleeve.
  • Another addition to the invention provides that the fuel outflow from the inner valve control chamber via the outlet anal and the outlet throttle is controlled by a control valve, in particular a 2/2 control valve or a 2/3 control valve, so that the injector according to the invention is controlled with conventional ones Control valves is controllable.
  • a push rod is arranged between the valve piston and the nozzle needle, so that the control times are further reduced, in particular in the case of injectors with solenoid control valves.
  • the axial distance between the valve control chamber and the pressure chamber can be adapted to the other structural conditions.
  • valve piston and the push rod are made in one piece, so that the number of components is reduced.
  • a closing spring which is supported against the valve piston and at least indirectly against the housing, or that a leakage oil chamber which is arranged between the valve piston and the nozzle needle is supported against the nozzle needle and a shoulder of the housing Closing spring is available so that the injector closes automatically if there is no control pressure.
  • the ring area limited by the diameter of a bore in the housing which guides the nozzle needle and by the diameter of the sealing line between the nozzle needle and nozzle needle seat is greater than or equal to the ring area limited by the diameter of the valve piston and the diameter of the blind hole , so that when the control pressure is present, the forces acting on the valve piston and nozzle needle always produce a resultant force in the direction of the nozzle needle seat.
  • the diameter of the blind hole is 1.5 mm to 2.3 mm, in particular 1.8 mm to 2 mm larger than the diameter of the sealing line between the nozzle needle and the nozzle needle seat, so that an extensive compensation of the valve piston and Nozzle needle acting forces is reached.
  • the diameter of the bore and the diameter of the valve piston are the same, so that the manufacture of the injector is simplified.
  • the housing is designed in two parts, in particular that the valve control chamber is arranged in the first part of the housing and that the pressure chamber is arranged in the second part of the housing, so that the manufacture, assembly and operating behavior of the injector according to the invention are improved ,
  • a common-rail fuel injection system for internal combustion engines with a high-pressure fuel pump, with a high-pressure fuel accumulator and with at least one injector with a valve control chamber delimited by the end face of a valve piston which is operatively connected to a nozzle needle and which has an inlet throttle is connected to a high-pressure connection, characterized in that the valve control chamber is subdivided into an outer valve control chamber and an inner valve control chamber, and that the inlet throttle is arranged between the outer valve control chamber and the inner valve control chamber, so that the control times of the injector are shortened and thus the measurement of the injection quantities is improved.
  • the drawing shows a cross section through an injector according to the invention.
  • the fuel not shown, is fed via a high-pressure connection 1 via an inlet channel 3 to an injection nozzle 5 and into an outer valve control chamber 6.
  • the fuel comes from the high-pressure fuel reservoir (common rail), not shown, and has its pressure.
  • the outer valve control chamber 6 is connected to an inner valve control chamber 9 via an inlet throttle 7. Via a control valve 11, which is only indicated, the inner valve control chamber 9 can be equipped with a control valve (not shown)
  • Fuel return can be connected.
  • An outlet channel 13 and an outlet throttle 14 are arranged between the inner valve control chamber 9 and the control valve 11.
  • the housing 15 of the injector consists of a first part 16 and a second part 17.
  • the outer valve control chamber 6 and the inner valve control chamber 9 are delimited by a valve piston 19 shown in partial section.
  • a circular sealing line is formed between the nozzle needle 21 and the nozzle needle seat 22. The diameter of the sealing line is designated d 4 .
  • the push rod 20 and the valve piston 19 can be made in one piece or in two parts.
  • the decision for one of the mentioned embodiments depends on. a. on the manufacturing costs, the assemblability and the operating behavior of the injector.
  • the nozzle needle 21 is guided in a bore 23 with the diameter d 3 .
  • the high pressure prevailing in a pressure chamber 25 corresponds to the pressure of the high-pressure fuel reservoir (not shown) of the fuel injection system. This pressure causes a hydraulic force on the ring area delimited by the diameters d 3 and d 4 .
  • Blind hole 29 is the inner valve control chamber 9.
  • a sleeve 31 which is screwed to the first part 16 of the housing 15, projects into the blind hole 29.
  • the outlet channel 13 and the outlet throttle 14 are arranged in the sleeve 31.
  • a closing spring 35 is present between a shoulder 33 of the sleeve 31 and the end face 27 of the valve piston 19. It ensures that the nozzle needle 21 is always closed when the fuel has no excess pressure.
  • valve piston 19 Between valve piston 19 and nozzle needle 21 is a
  • Leakage oil chamber 37 in which the leaks from the injection nozzle 5 and the outer valve control chamber 6 are collected and discharged into the fuel return, not shown.
  • the closing spring 35 can also be arranged in the leak oil chamber 37 and against the nozzle needle 21 and a shoulder in the first part 15 of the housing 15 or the like. support.
  • Circular area is larger than the ring area delimited by the diameters d 3 and d 4 , the resulting hydraulic force is directed onto the nozzle needle 21 in the direction of the nozzle needle seat 22 when the injection nozzle 5 is closed.
  • the injector 5 opens when the control valve 11 is opened and as a result the pressure in the inner valve control chamber 9 collapses.
  • the prerequisite for this is that the diameter limited by the diameters d 2 and d ⁇
  • Ring area is smaller than the ring area delimited by the diameters d 3 and d 4 .
  • d 2 is equal to d 3 , so that the above-mentioned requirement is reduced to the condition d x greater than d 4 .
  • control valve 11 which can be designed as a 2/2 control valve or as a 2/3 control valve, closes again, a high pressure builds up again in the inner valve control chamber 9, which is equal to the pressure in the
  • High-pressure fuel accumulator and in the pressure chamber 25 is so that the resulting hydraulic force valve piston 19 and nozzle needle 21 into the nozzle needle seat 22. It should be borne in mind that the pressure of the fuel is reduced from the pressure chamber 25 to the combustion chamber down to the pressure prevailing in the combustion chamber. As a result, the hydraulic force acting on the circular surface with the diameter d 5 against the closing direction is less than the hydraulic force acting on the end face 27 of the valve piston 19 in the same diameter range.

Landscapes

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

Abstract

L'invention concerne un injecteur d'un système à injection de carburant « common rail » de moteurs à combustion interne comprenant un compartiment de commande de soupapes délimité par une face frontale (27) d'un piston à soupape (19) en liaison active avec un pointeau (21). Ce compartiment de commande de soupapes qui est relié à un raccord haute pression (1) par une valve d'arrivée (7), est subdivisé en un compartiment externe (6) et un compartiment interne (9). La valve d'arrivée (7) est placée entre le compartiment de commande de soupapes externe (6) et le compartiment de commande de soupapes interne (9).
PCT/DE2000/003593 1999-10-14 2000-10-12 Injecteur d'un systeme a injection de carburant « common rail. » de moteurs a combustion interne avec equilibrage partiel des forces de l'aiguille d'injecteur WO2001027462A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19949526.2 1999-10-14
DE1999149526 DE19949526A1 (de) 1999-10-14 1999-10-14 Injektor für ein Common-Rail-Kraftstoffeinspritzsystem für Brennkraftmaschinen mit teilweisem Kraftausgleich der Düsennadel

Publications (1)

Publication Number Publication Date
WO2001027462A1 true WO2001027462A1 (fr) 2001-04-19

Family

ID=7925617

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2000/003593 WO2001027462A1 (fr) 1999-10-14 2000-10-12 Injecteur d'un systeme a injection de carburant « common rail. » de moteurs a combustion interne avec equilibrage partiel des forces de l'aiguille d'injecteur

Country Status (2)

Country Link
DE (1) DE19949526A1 (fr)
WO (1) WO2001027462A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2364099A (en) * 2000-06-29 2002-01-16 Bosch Gmbh Robert Common-rail fuel injector with central high-pressure connection
GB2366329A (en) * 2000-07-10 2002-03-06 Bosch Gmbh Robert Accumulator/common rail fuel injector/nozzle needle combination having a controlchamber on each side of the control valve member

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0661442A1 (fr) * 1993-12-30 1995-07-05 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Soupape de dosage pour contrôler la soupape de fermeture d'un injecteur de carburant
EP0798459A2 (fr) * 1996-03-30 1997-10-01 LUCAS INDUSTRIES public limited company Buse d'injection
US5685483A (en) * 1994-06-06 1997-11-11 Ganser-Hydromag Fuel injection valve for internal combustion engines
DE19744518A1 (de) * 1997-10-09 1999-04-15 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5671715A (en) * 1995-04-27 1997-09-30 Nipon Soken, Inc. Fuel injection device
JPH11280588A (ja) * 1998-03-31 1999-10-12 Denso Corp 燃料噴射ノズル

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0661442A1 (fr) * 1993-12-30 1995-07-05 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Soupape de dosage pour contrôler la soupape de fermeture d'un injecteur de carburant
US5685483A (en) * 1994-06-06 1997-11-11 Ganser-Hydromag Fuel injection valve for internal combustion engines
EP0798459A2 (fr) * 1996-03-30 1997-10-01 LUCAS INDUSTRIES public limited company Buse d'injection
DE19744518A1 (de) * 1997-10-09 1999-04-15 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2364099A (en) * 2000-06-29 2002-01-16 Bosch Gmbh Robert Common-rail fuel injector with central high-pressure connection
GB2364099B (en) * 2000-06-29 2002-08-21 Bosch Gmbh Robert Injector with central high-pressure connection
GB2366329A (en) * 2000-07-10 2002-03-06 Bosch Gmbh Robert Accumulator/common rail fuel injector/nozzle needle combination having a controlchamber on each side of the control valve member
GB2366329B (en) * 2000-07-10 2002-09-04 Bosch Gmbh Robert Injector/Nozzle needle combination having a control chamber-side coupling arrangement

Also Published As

Publication number Publication date
DE19949526A1 (de) 2001-04-19

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