WO2001029397A1 - Injecteur pour un systeme d'injection a rampe commune de moteurs a combustion interne, a compensation partielle des forces agissant sur l'aiguille - Google Patents

Injecteur pour un systeme d'injection a rampe commune de moteurs a combustion interne, a compensation partielle des forces agissant sur l'aiguille Download PDF

Info

Publication number
WO2001029397A1
WO2001029397A1 PCT/DE2000/003595 DE0003595W WO0129397A1 WO 2001029397 A1 WO2001029397 A1 WO 2001029397A1 DE 0003595 W DE0003595 W DE 0003595W WO 0129397 A1 WO0129397 A1 WO 0129397A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle needle
injector according
housing
injector
diameter
Prior art date
Application number
PCT/DE2000/003595
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 WO2001029397A1 publication Critical patent/WO2001029397A1/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

Definitions

  • the invention relates to an injector for a common rail injection system for internal combustion engines with a valve control space delimited by the end face of a valve piston, with a nozzle needle guided in a bore, which is pressed into a nozzle needle seat when the injector is closed, and with one delimited in the longitudinal direction by the nozzle needle seat pressure chamber.
  • the valve piston and the region of the nozzle needle which is guided in the housing of the injector have essentially the same diameter. Since these diameters are comparatively large, the annular gap between the valve piston and the associated bore or nozzle needle and the associated bore is also relatively large. This leads to considerable problems with the sealing against the control pressure or to high leakage losses.
  • the invention has for its object to provide an injector for a common rail injection system in which the leakage losses between the nozzle needle and the bore guiding the nozzle needle are small and in addition a partial force compensation of the nozzle needle is achieved.
  • an injector for a common rail injection system for internal combustion engines with a valve control space delimited by the end face of a valve piston, with a nozzle needle guided in a bore, which is pressed into a nozzle needle seat when the injector is closed, and with one from the nozzle needle seat in the longitudinal direction limited pressure space, the diameter of the end face of the
  • Valve piston is larger than the diameter of the bore and the diameter of the bore is larger than the diameter of the sealing line between the nozzle needle and the nozzle needle seat.
  • This injector has the advantage that because of the smaller diameter of the nozzle needle in the area in which it is guided in the bore, the annular gap between the bore and the nozzle needle is small, and an effective seal against the control pressure of the pressure chamber is thus possible.
  • Nozzle needle and nozzle needle seat as well as the diameter of the bore is limited, and the force acting on it.
  • a variant provides that 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.
  • the diameter of the nozzle needle in the pressure chamber is at least partially larger than in the bore, so that there is greater security against kinking of the nozzle needle in the region of the pressure chamber.
  • a sleeve with the bore is arranged in the second part of the housing, so that on the one hand the mountability of the injector is improved and also the manufacture of the bore with the required accuracy is facilitated.
  • the end face of the sleeve delimits the pressure space in the longitudinal direction, so that the injector in
  • the sleeve has a second bore, which connects the inlet channel and the pressure chamber to one another, so that manufacture and assembly are further simplified.
  • the first part and the second part of the housing are detachably connected to one another by a union nut, so that a uniform contact force is generated over the entire circumference of the housing parts when the union nut is tightened, and thus a good seal of the injector from the environment is achieved.
  • an intermediate piece is arranged between the first part and the second part of the housing, so that the assembly of the injector according to the invention is further facilitated.
  • a sealing element in particular an O-ring, is present between the first part and the second part of the housing or the first part of the housing and the intermediate piece, so that leakage oil can escape into the environment.
  • Another variant of the invention provides that the fuel flow into the valve control chamber via an inlet throttle and the fuel outflow via a control valve, in particular a 2/2 control valve, so that the injector is controlled simply and reliably.
  • a further addition to the invention provides that bores are provided in the second part of the housing and, if appropriate, in the intermediate piece, which connect the inlet channel to the pressure chamber, so that the injector according to the invention is particularly compact and, in addition, the manufacture is facilitated.
  • a pressure rod is arranged between the valve piston and the nozzle needle, so that the axial distance between the valve control chamber and the pressure chamber can be adapted to the other structural boundary conditions.
  • valve piston and the pressure rod are made in one piece, so that the number of components is reduced.
  • nozzle spring which is supported against a shoulder of the valve piston and a shoulder of the housing, so that the injector closes automatically when there is no control pressure.
  • 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 via an inlet throttle 7 into a valve control chamber 9.
  • the valve control chamber 9 is connected to a fuel return 13 via a control valve 11.
  • the injector consists of a housing with a first part 15 and a second part 16.
  • An intermediate piece 17 is arranged between the first and second parts 15, 16.
  • the valve control chamber 9 is delimited by a valve piston 19.
  • a circular sealing line is formed between the nozzle needle 21 and the nozzle needle seat 22.
  • 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 above-mentioned embodiments depends, among other things, on the production costs, the ability to be assembled and the operating behavior of the injector.
  • the nozzle needle 21 has a first diameter 23, a second diameter 25 and a third diameter 27. With its first diameter 23, the nozzle needle 21 is guided in a bore 29 of a sleeve 31.
  • the nozzle needle 21 has the second diameter 25. At its end facing the nozzle needle seat 22, the nozzle needle 21 has the third diameter 27.
  • the first diameter 23 is smaller than the second diameter 25 and larger than the third diameter 27.
  • the pressure chamber 33 is sealed by the sleeve 31, the nozzle needle 21 and the second part 16 of the injector housing.
  • the nozzle needle 21 is guided in the bore 29 with so little play that the pressure of the pressure chamber 33 is almost completely reduced in the annular gap between the nozzle needle 21 and the bore 29.
  • the seal between the sleeve 31 and the second part 16 of the injector housing takes place via a shoulder 39 in the housing and the end face of the sleeve 31.
  • the first part 15 of the housing, the intermediate piece 17 and the second part 16 of the housing are clamped together by a union nut 41. Any leakage oil that occurs is prevented by an O-ring 43 from escaping into the environment and via a bore 45 in the Fuel return 13 discharged.
  • Leakage oil which emerges between the valve piston 19 and its guide in the housing, can flow along the push rod 20 to the intermediate piece 17 and can be discharged from there via the bore 45 into the fuel return 13.
  • Control chamber 9 as well as in the pressure chamber 33 the control pressure provided by the common rail pressure accumulator, not shown. Since the end face 53 of the valve piston 19 is larger than the ring area delimited by the first diameter 23 and third diameter 27, the resulting hydraulic force presses the valve piston 19 and the nozzle needle 21 into the nozzle needle seat 22. It was assumed that the diameter of the above-mentioned. Sealing line between nozzle needle 21 and nozzle needle seat 22 and the third diameter 27 of the nozzle needle 21 are the same. This assumption is correct since the cone angle of the nozzle needle seat 22 is generally somewhat smaller than that of the tip of the nozzle needle 21. Strictly speaking, the ring area is limited by the diameter of the sealing line.
  • the annular surface which is limited by the difference between the first diameter 23 and the second diameter 25, makes no contribution to the resulting hydraulic force.
  • the thickening of the nozzle needle 21 with the second diameter 25 serves to stabilize the nozzle needle 21 in the pressure chamber 33. Because the nozzle needle 21 is in the region the bore 29 has a very small third diameter 23, the above-mentioned annular gap between the sleeve 31 and the nozzle needle 21 is relatively small, so that its sealing against the control pressure in the pressure chamber 33 is very possible.

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

Injecteur à rampe commune doté d'une aiguille (21) très mince et d'une compensation au moins partielle des forces hydrauliques agissant sur l'aiguille (21). La présente invention permet en outre une réduction des pertes par fuites et une construction particulièrement compacte.
PCT/DE2000/003595 1999-10-19 2000-10-12 Injecteur pour un systeme d'injection a rampe commune de moteurs a combustion interne, a compensation partielle des forces agissant sur l'aiguille WO2001029397A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999150223 DE19950223A1 (de) 1999-10-19 1999-10-19 Injektor für ein Common-Rail-Einspritzsystem für Brennkraftmaschinen mit teilweisem Kraftausgleich der Düsennadel
DE19950223.4 1999-10-19

Publications (1)

Publication Number Publication Date
WO2001029397A1 true WO2001029397A1 (fr) 2001-04-26

Family

ID=7926090

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2000/003595 WO2001029397A1 (fr) 1999-10-19 2000-10-12 Injecteur pour un systeme d'injection a rampe commune de moteurs a combustion interne, a compensation partielle des forces agissant sur l'aiguille

Country Status (2)

Country Link
DE (1) DE19950223A1 (fr)
WO (1) WO2001029397A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010138894A (ja) * 2008-12-10 2010-06-24 Man Diesel Se 内燃機関用燃料噴射弁
WO2013140835A1 (fr) * 2012-03-21 2013-09-26 日立オートモティブシステムズ株式会社 Clapet d'injection de carburant

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0262539A1 (fr) * 1986-09-25 1988-04-06 Ganser-Hydromag Soupape d'injection de combustible
EP0778411A2 (fr) * 1995-12-05 1997-06-11 Denso Corporation Electrovanne et soupape d'injection de combustible pour un moteur à combustion interne
EP0844385A1 (fr) * 1996-11-21 1998-05-27 Denso Corporation Dispositif d'injection de combustible à accumulation pour moteur à combustion interne

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE513710C (de) * 1929-08-02 1930-12-01 Motoren Werke Mannheim Ag Brennstoffeinspritzventil mit druckgesteuerter Nadel fuer kompressorlose Dieselmotoren
US2595639A (en) * 1948-11-12 1952-05-06 American Bosch Corp Fuel injection apparatus
DE3888468T2 (de) * 1987-12-02 1994-09-29 Ganser Hydromag Elektronisch gesteuertes Brennstoffeinspritzventil.
DE19519192C1 (de) * 1995-05-24 1996-06-05 Siemens Ag Einspritzventil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0262539A1 (fr) * 1986-09-25 1988-04-06 Ganser-Hydromag Soupape d'injection de combustible
EP0778411A2 (fr) * 1995-12-05 1997-06-11 Denso Corporation Electrovanne et soupape d'injection de combustible pour un moteur à combustion interne
EP0844385A1 (fr) * 1996-11-21 1998-05-27 Denso Corporation Dispositif d'injection de combustible à accumulation pour moteur à combustion interne

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010138894A (ja) * 2008-12-10 2010-06-24 Man Diesel Se 内燃機関用燃料噴射弁
WO2013140835A1 (fr) * 2012-03-21 2013-09-26 日立オートモティブシステムズ株式会社 Clapet d'injection de carburant
JP2013194615A (ja) * 2012-03-21 2013-09-30 Hitachi Automotive Systems Ltd 燃料噴射弁

Also Published As

Publication number Publication date
DE19950223A1 (de) 2001-04-26

Similar Documents

Publication Publication Date Title
AT1626U1 (de) Speichereinspritzsystem für brennkraftmaschinen
DE102007001363A1 (de) Injektor zum Einspritzen von Kraftstoff in Brennräume von Brennkraftmaschinen
EP1123461B1 (fr) Injecteur de structure compacte pour systeme d'injection a rampe commune de moteur a combustion interne
EP1144842B1 (fr) Injecteur pour systeme d'injection de carburant pour moteurs a combustion interne, muni d'un pointeau faisant saillie dans la chambre de commande de soupape
EP1356203B1 (fr) Dispositif pour alimenter un moteur a combustion interne en carburant sous haute pression
DE102016208055A1 (de) Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19945785B4 (de) Kraftstoffeinspritzsystem für Brennkraftmaschinen und Verfahren zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine
DE102012211169A1 (de) Kraftstoffinjektor
EP1314881A2 (fr) Injecteur de carburant avec régulation du taux d'injection pour un système d'injection du type common-rail
WO2001029397A1 (fr) Injecteur pour un systeme d'injection a rampe commune de moteurs a combustion interne, a compensation partielle des forces agissant sur l'aiguille
WO2001018381A1 (fr) Soupape de commande en plusieurs parties pour injecteur d'un systeme d'injection de carburant de moteur a combustion interne
DE10307002A1 (de) Kraftstoffeinspritzdüse und Pumpe-Düse-Einheit
DE10124207A1 (de) Druckverstärker einer Kraftstoffeinspritzeinrichtung
EP1483499A1 (fr) Systeme pour moduler en pression le comportement d'injection
DE102006050033A1 (de) Injektor, insbesondere Common-Rail-Injektor
DE102006014245A1 (de) Kraftstoffinjektor
WO2002042636A1 (fr) Systeme d'injection de carburant
DE102018200565A1 (de) Injektor zur Dosierung von gasförmigem Kraftstoff, Gaseinblassystem mit einem solchen Injektor und Verfahren zum Betreiben dieses Injektors
DE102018208859A1 (de) Verfahren zum Betreiben eines Kraftstoffinjektors, Kraftstoffinjektor
DE19963920B4 (de) Injektor für ein Common-Rail-Kraftstoffeinspritzsystem mit schiebergesteuertem Zulaufkanal und direkter Kopplung von Steuerkolben und Düsenkanal
DE19963934A1 (de) Steuerventil für einen Injektor für ein Kraftstoffeinspritzsystem mit von einem Stößel geführtem Stellglied
DE19949526A1 (de) Injektor für ein Common-Rail-Kraftstoffeinspritzsystem für Brennkraftmaschinen mit teilweisem Kraftausgleich der Düsennadel
DE10164395A1 (de) Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
DE102022213272A1 (de) Anordnung zum Einblasen eines gasförmigen Mediums
DE10152253B4 (de) Ventil zum Steuern von Flüssigkeiten

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CN IN JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP