EP1144842B1 - Injektor für ein kraftstoffeinspritzsystem für brennkraftmaschinen mit in den ventilsteuerraum ragender düsennadel - Google Patents

Injektor für ein kraftstoffeinspritzsystem für brennkraftmaschinen mit in den ventilsteuerraum ragender düsennadel Download PDF

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Publication number
EP1144842B1
EP1144842B1 EP00979425A EP00979425A EP1144842B1 EP 1144842 B1 EP1144842 B1 EP 1144842B1 EP 00979425 A EP00979425 A EP 00979425A EP 00979425 A EP00979425 A EP 00979425A EP 1144842 B1 EP1144842 B1 EP 1144842B1
Authority
EP
European Patent Office
Prior art keywords
valve
nozzle needle
valve body
injector
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.)
Expired - Lifetime
Application number
EP00979425A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1144842A1 (de
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 EP1144842A1 publication Critical patent/EP1144842A1/de
Application granted granted Critical
Publication of EP1144842B1 publication Critical patent/EP1144842B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
    • 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 is based on an injector for a fuel injection system for internal combustion engines with a valve needle control valve chamber.
  • valve control chamber is accessible from the nozzle needle is limited and the valve control chamber is arranged in a valve body.
  • the invention is therefore based on the object to provide an injector for a fuel injection system for internal combustion engines, whose control times are reduced and whose external dimensions are particularly compact.
  • This injector has the advantage that the length of the nozzle needle can be significantly reduced, which reduces the inertia of the moving components of the injector. This allows short timings.
  • the valve control chamber can move closer to the injection nozzle, which also thinner nozzle needles are possible. This effect contributes to a further reduction of the moving masses within the injector.
  • the diameter ratios of the injector according to the invention correspond approximately to those of an injection nozzle according to the prior art.
  • valve control chamber is arranged in a valve body, it can be easily and inexpensively manufactured. In addition, the number of sealing points remains low.
  • a conical sealing seat is present between the valve body and the housing, so that the pressure chamber is sealed in a simple manner against the environment.
  • a plate spring is clamped in a further advantageous embodiment of the invention between the cover and the valve body, which presses the valve body against the sealing seat.
  • the pressure chamber communicates with a high-pressure fuel reservoir via an inlet channel
  • the valve control chamber is at least indirectly connected to a high-pressure fuel reservoir via an inlet throttle and that the valve control chamber communicates with the pressure chamber via an inlet throttle, so that the necessary hydraulic connections between valve control room, pressure chamber and high-pressure fuel storage can be realized in a simple manner.
  • valve control chamber via a flow channel, an outlet throttle and a control valve, in particular a 2/2-control valve or a 2/3-control valve, with a fuel return is connectable, so that by opening the control valve, the pressure can be reduced in the valve control room. As a result, the nozzle needle releases the sealing seat and the injection begins.
  • a variant of the invention provides that the outlet channel and an outlet throttle are arranged in the valve body, so that a further reduction in the required installation space is achieved.
  • the diameter of the end face of the nozzle needle is greater than the diameter of the sealing line between the nozzle needle and a nozzle needle seat, so that at the same pressure in the valve control chamber and pressure chamber, the resulting hydraulic force always causes a closing of the injector.
  • control valve is actuated by a piezoelectric actuator, so that the control times of the injector according to the invention are further reduced.
  • the fuel injection system has a high-pressure fuel storage, so that the advantages of the injector according to the invention also benefit common-rail fuel injection systems.
  • the drawing shows a cross section through an injector according to the invention.
  • a high-pressure connection 1 the fuel, not shown, is passed through an inlet channel 3 into a pressure chamber 5 of an injection nozzle 7.
  • the fuel comes from the high-pressure fuel storage (common rail), not shown, and has the pressure.
  • a valve control chamber 9 is connected to the pressure chamber 5.
  • the valve control chamber 9 can be connected to a non-pressurized fuel return, not shown.
  • a drain channel 13 and an outlet throttle 14 are arranged between valve control chamber 9 and control valve 11, a drain channel 13 and an outlet throttle 14 are arranged.
  • a housing 15 of the injector is connected by a cap nut 16 with a cover 17.
  • the cover 17 also fixes a protruding into the pressure chamber 5 valve body 19.
  • a guide bore 20 with the diameter d 2 for a nozzle needle 21 is present in the valve body 19.
  • the arranged in the valve body 19 valve control chamber 9 is bounded by an end face 23 of the nozzle needle.
  • a conical sealing seat 25 is provided, which seals the pressure chamber 5 from the environment.
  • the nozzle needle 21 prevents the pressurized fuel flows between the injections from the injection nozzle 7 through a spray hole 27 in the combustion chamber, not shown. This is done by the nozzle needle 21 is pressed into a nozzle needle seat 29 and thus seals the inlet channel 3 against the combustion chamber, not shown. It forms between the nozzle needle 21 and nozzle needle seat 29 has a circular sealing line. The diameter of the sealing line is designated d 1 .
  • a closing spring 33 is present between a shoulder 31 of the nozzle needle 21 and the valve body 19, a closing spring 33 is present. It ensures that the nozzle needle 21 is always closed when the fuel has no overpressure.
  • the injection nozzle 5 opens when the control valve 11 is opened and as a result, the pressure in the valve control chamber 9 collapses. In this case, the resulting hydraulic force acts in the direction of the control valve 11 and lifts the nozzle needle 21 from the nozzle needle seat 29. Thus, the fuel can flow from the pressure chamber 5 via the injection hole 27 into the combustion chamber and the injection begins.
  • control valve 11 which can be designed as a 2/2-control valve or a 2/3-control valve, closes again, builds up in the valve control chamber 9 again a high pressure which is equal to the pressure in the pressure chamber 5, so that the resulting hydraulic Force the nozzle needle 21 press again into the nozzle needle seat 29 and the injection completed.
  • the diameter of an injector according to the invention corresponds to that of an injection nozzle according to the current state of the art.
  • the masses of the moving parts are very low, since a valve piston and a push rod can be omitted and the nozzle needle has very small dimensions. This leads to very low control times of the injector, which can be fully utilized especially in connection with a piezo-actuator actuated control valve 11. For example, lowest pre-injection quantities can be realized.
  • the small number of components also leads to cost advantages in the production. Finally, there are no leakage losses.

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)
EP00979425A 1999-10-14 2000-10-12 Injektor für ein kraftstoffeinspritzsystem für brennkraftmaschinen mit in den ventilsteuerraum ragender düsennadel Expired - Lifetime EP1144842B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19949527A DE19949527A1 (de) 1999-10-14 1999-10-14 Injektor für ein Kraftstoffeinspritzsystem für Brennkraftmaschinen mit in den Ventilsteuerraum ragender Düsennadel
DE19949527 1999-10-14
PCT/DE2000/003597 WO2001027463A1 (de) 1999-10-14 2000-10-12 Injektor für ein kraftstoffeinspritzsystem für brennkraftmaschinen mit in den ventilsteuerraum ragender düsennadel

Publications (2)

Publication Number Publication Date
EP1144842A1 EP1144842A1 (de) 2001-10-17
EP1144842B1 true EP1144842B1 (de) 2006-04-12

Family

ID=7925618

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00979425A Expired - Lifetime EP1144842B1 (de) 1999-10-14 2000-10-12 Injektor für ein kraftstoffeinspritzsystem für brennkraftmaschinen mit in den ventilsteuerraum ragender düsennadel

Country Status (5)

Country Link
US (1) US6820827B1 (ja)
EP (1) EP1144842B1 (ja)
JP (1) JP2003511623A (ja)
DE (2) DE19949527A1 (ja)
WO (1) WO2001027463A1 (ja)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10015268A1 (de) * 2000-03-28 2001-10-04 Siemens Ag Einspritzventil mit Bypaßdrossel
DE10026286A1 (de) * 2000-05-26 2001-12-13 Orange Gmbh Einspritzventil zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine
DE10152268A1 (de) * 2001-10-20 2003-04-30 Bosch Gmbh Robert Einspritzventil
EP1442209A1 (de) 2001-11-09 2004-08-04 Siemens Aktiengesellschaft Steuermodul für einen injektor eines speichereinspritzsystems
DE102004062006A1 (de) * 2004-12-23 2006-07-13 Robert Bosch Gmbh Kraftstoffinjektor mit direkt angesteuertem Einspritzventilglied
DE102007004553A1 (de) * 2007-01-30 2008-07-31 Robert Bosch Gmbh Kugelsitzventil mit verringertem Erosionsverhalten
JP4868524B2 (ja) * 2007-04-09 2012-02-01 ボッシュ株式会社 燃料噴射弁
DE102009027727A1 (de) * 2009-07-15 2011-01-20 Robert Bosch Gmbh Ventilanordnung
US8881709B2 (en) 2009-09-02 2014-11-11 Caterpillar Inc. Fluid injector with back end rate shaping capability
DK178692B1 (en) 2015-04-22 2016-11-21 Man Diesel & Turbo Filial Af Man Diesel & Turbo Se Tyskland A fuel valve for a large two-stroke self-igniting internal combustion engine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001011219A1 (de) * 1999-08-04 2001-02-15 Robert Bosch Gmbh Common-rail-injektor

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2028442A1 (de) 1970-06-10 1971-12-16 Daimler Benz Ag Kraftstoffeinspritzventil fur Ver brennungsmotoren
AT378242B (de) * 1981-07-31 1985-07-10 Berchtold Max Prof Kraftstoffeinspritzanlage fuer brennkraftmaschinen, insbesondere dieselmotoren
JPH01232161A (ja) 1988-03-14 1989-09-18 Yamaha Motor Co Ltd エンジンの高圧燃料噴射装置
US5230613A (en) * 1990-07-16 1993-07-27 Diesel Technology Company Common rail fuel injection system
JPH0828388A (ja) * 1994-07-21 1996-01-30 Zexel Corp 燃料噴射ノズル
DE19616812B4 (de) * 1995-04-27 2004-09-30 Nippon Soken, Inc., Nishio Kraftstoffeinspritzvorrichtung
GB9520243D0 (en) * 1995-10-04 1995-12-06 Lucas Ind Plc Injector
US5779149A (en) * 1996-07-02 1998-07-14 Siemens Automotive Corporation Piezoelectric controlled common rail injector with hydraulic amplification of piezoelectric stroke
GB9622335D0 (en) * 1996-10-26 1996-12-18 Lucas Ind Plc Injector arrangement
DE19802495A1 (de) * 1997-06-19 1998-12-24 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten
DE19727896A1 (de) * 1997-07-01 1999-01-07 Bosch Gmbh Robert Kraftstoffeinspritzventil
DE19743669A1 (de) * 1997-10-02 1999-04-08 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten
DE19744518A1 (de) * 1997-10-09 1999-04-15 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
GB9725802D0 (en) * 1997-12-06 1998-02-04 Lucas Ind Plc Fuel injection
GB9805854D0 (en) * 1998-03-20 1998-05-13 Lucas France Fuel injector
JPH11280588A (ja) * 1998-03-31 1999-10-12 Denso Corp 燃料噴射ノズル
US6079641A (en) * 1998-10-13 2000-06-27 Caterpillar Inc. Fuel injector with rate shaping control through piezoelectric nozzle lift

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001011219A1 (de) * 1999-08-04 2001-02-15 Robert Bosch Gmbh Common-rail-injektor

Also Published As

Publication number Publication date
JP2003511623A (ja) 2003-03-25
DE19949527A1 (de) 2001-04-19
DE50012570D1 (de) 2006-05-24
US6820827B1 (en) 2004-11-23
EP1144842A1 (de) 2001-10-17
WO2001027463A1 (de) 2001-04-19

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