WO2004063553A1 - Dispositif d'injection de carburant - Google Patents

Dispositif d'injection de carburant Download PDF

Info

Publication number
WO2004063553A1
WO2004063553A1 PCT/DE2003/002793 DE0302793W WO2004063553A1 WO 2004063553 A1 WO2004063553 A1 WO 2004063553A1 DE 0302793 W DE0302793 W DE 0302793W WO 2004063553 A1 WO2004063553 A1 WO 2004063553A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve element
pressure
inner valve
fuel
injection device
Prior art date
Application number
PCT/DE2003/002793
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 WO2004063553A1 publication Critical patent/WO2004063553A1/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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/086—Having more than one injection-valve controlling discharge orifices
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/042—The valves being provided with fuel passages
    • 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
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies
    • 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 a fuel injection device with a housing, with at least one outer valve element and with at least one inner valve element which is guided in a fluid-tight manner in the outer valve element, each of which is acted upon by an actuating device against a valve seat on the housing side, with one existing upstream from the valve seat of the outer valve element Inflow space, and each with at least one fuel outlet channel assigned to the respective valve element.
  • Such a fuel injection device is known from DE 40 23 223 AI. This shows an injector with two coaxial valve needles. The valve needles are each against a by a helical compression spring
  • Valve seat pressed. From this they are pushed away against the force of the helical compression springs when the pressure of the fuel is increased in the area of the valve seat.
  • “stroke-controlled” fuel injection devices are also known in which a comparatively high pressure is constantly applied in the area of the valve seat. By temporarily reducing one in
  • the object of the present invention is to develop a fuel injection device of the type mentioned at the outset in such a way that it can be produced as simply and inexpensively as possible. Furthermore, the control should be as simple and reliable as possible
  • a pressure channel is present in the inner valve element, which on the one hand opens into a lateral surface of the inner valve element and on the other hand is connected to a pressure chamber which extends from a pressure surface acting in the opening direction inner valve element is limited, the mouth of the pressure channel present in the outer surface being covered by the closed outer valve element and being released from a certain opening stroke of the outer valve element.
  • the inner valve element can only be switched when - the outer valve element has performed a correspondingly sufficient opening stroke. If there is no such opening stroke of the outer valve element, the inner valve element remains reliably closed. This is possible with simple hydraulic measures without the need for complex mechanical drivers or the like.
  • the movement of the outer valve element can be adjusted either by the fluid pressure correspondingly acting in the opening direction or by the duration of the application of the force acting in the opening direction of the outer valve element. A combination of both effects is also possible. Such control is easy to implement.
  • the 'inner valve member has only one radially inwardly located from the sealing seat printing surface. This measure has two positive effects: Firstly, it is ensured that after opening the outer valve element no force acting in the opening direction initially acts on the inner valve element. This therefore remains reliably closed.
  • the inner valve element in an end blind bore of the outer valve element is included.
  • the assembly of the fuel injector is simplified and the manufacturing cost of the fuel injector is reduced because a blind hole can be drilled faster than a through hole.
  • the proposal in which the inner valve element is acted on by a helical compression spring against the valve seat assigned to it also has a cost-reducing effect. This is particularly advantageous in connection with the end blind bore in the outer valve element proposed further above.
  • a further cost reduction in the manufacture of the fuel injection device according to the invention is achieved in that the pressure channel in the inner valve element has a section running essentially parallel to the longitudinal axis and at least one section running essentially in the radial direction.
  • Such channels can still be introduced without any problems, even taking into account the extremely small dimensions of the inner valve element.
  • Figure 1 is a schematic representation of a
  • FIG. 2 is a partial section through one of the Fuel injectors of Figure 1;
  • FIG. 3 shows a detail III of the fuel injection device from FIG. 2.
  • a fuel system bears the overall reference number 10 in FIG. 1. It belongs to an internal combustion engine 12 and comprises a fuel tank 14, from which an electric fuel pump 16 (pre-feed pump) delivers the fuel to a high-pressure fuel pump 18.
  • the high-pressure fuel pump 18 is mechanically driven by the internal combustion engine, compresses the fuel to a very high pressure, and delivers it to a fuel manifold 20 (rail).
  • the fuel is stored under very high pressure.
  • High pressure lines 22 connected to several injectors 24. These inject the fuel directly into their respective combustion chambers 26.
  • a low-pressure fuel line 28 leads from the injectors 24 back to the fuel tank 14.
  • FIGS. 2 and 3 An injector 24 is shown in detail in FIGS. 2 and 3. However, for reasons of clarity, not all reference numerals are entered in FIG. 2.
  • the injector 24 comprises a housing 30 in which a stepped blind bore 32 is present.
  • an outer valve element 34 is arranged, which tapers conically in two stages in a lower area in FIG.
  • the radially outer conical surface forms a pressure surface 36 which is delimited by a sealing edge 38. This works with a housing-side sealing seat 39 together.
  • Valve element 42 on a housing-side valve seat 48.
  • the inner valve element 42 is acted upon by a helical compression spring 50, which is clamped between a circumferential shoulder 52 of the inner valve element 42 and a bottom 54 of the blind bore 40.
  • the helical compression spring 50 is guided by a pin-like section 56 of the inner valve element 42.
  • valve element 42 extending portion 58a and a portion 58b transverse to the longitudinal axis of the inner valve member 42.
  • the transverse section 58b opens into the outer circumferential surface 44 of the inner valve element 42 at two diametrically opposite locations.
  • the longitudinally extending section 58a of the pressure channel 58 opens into a conical pressure surface 60 arranged radially inward from the sealing edge 46 at the lower end of the inner valve element 42 ,
  • valve element 34 in FIGS. 2 and 3 corresponds to the customary configuration in the case of so-called “stroke-controlled” injectors. Therefore, only the essential elements of this area are dealt with below:
  • a support ring 70 is supported on a circumferential shoulder 68 of the valve element 34. This is supported in turn by a helical compression spring 72 which acts on an annular sleeve 74 against a housing section 76.
  • the upper end of the valve element 34 in FIG. 2 is delimited by a pressure surface 78. Together with the sleeve 74 and the housing section 76, this in turn delimits a control chamber 80.
  • the control chamber 80 can be connected to the high-pressure line 22 via a high-pressure duct 82 and an inflow throttle 84.
  • the inflow throttle 84 is introduced as a bore in the wall of the sleeve 88.
  • An outlet throttle 86 leads from the control chamber 80 to a switching valve 88 with which the control chamber 80 can be connected to the low-pressure fuel line 28. Via the high pressure channel 82 and one between the
  • the injector 24 works as follows:
  • the high fuel pressure prevailing in the fuel rail 20 is via the high-pressure line 22, the high-pressure channel 82 and the inflow throttle 84 are transmitted into the control chamber 80.
  • the high fuel pressure also prevails in this, which also prevails in the fuel collecting line 20.
  • the same also applies to the annular space 90 between the valve element 34 and the housing 30.
  • the corresponding high fluid pressure is therefore also present on the pressure surface 36 of the valve element 34.
  • the switching valve 88 is opened briefly.
  • the fuel present under high pressure in the control chamber 80 can flow out to the fuel tank 14 via the outlet throttle 86 and the low-pressure fuel line 28.
  • the hydraulic force acting on the pressure surface 78 is weakened.
  • the hydraulic force acting on the pressure surface 36 of the valve element 34 in the opening direction exceeds the forces acting overall in the closing direction, so that the sealing edge 38 of the valve element 34 lifts off the valve seat 39.
  • the valve element 34 is now the Free fuel connection in the direction of the fuel outlet channels 66.
  • the production of the inner valve element 42 is comparatively simple since the conical pressure surface 60 is evenly inclined and since the sections 58a and 58b of the pressure channel 58 can also be easily introduced into the inner valve element 42, which has a comparatively small diameter ,
  • Injection is ended by switching valve 88 being closed again.
  • High-pressure fuel can flow back into control chamber 80 via inflow throttle 84, so that the pressure in control chamber 80 rises again.
  • the hydraulic force acting on the pressure surface 78 which acts in the closing direction of the outer valve element 34, also increases accordingly.
  • the valve element 34 again moves with its sealing edge 38 in the direction of the valve seat 39, it again covers the mouth of the transverse section 58b of the pressure channel 58 in the outer lateral surface 44 of the inner valve element 42.

Landscapes

  • Engineering & Computer Science (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 dispositif d'injection de carburant (24) comprenant un boîtier (30), au moins un élément soupape extérieur (34) et au moins un élément soupape intérieur (42) guidé au moins partiellement de manière étanche aux fluides dans l'élément soupape extérieur (34). Les deux éléments soupapes sont sollicités chacun vers un siège de soupape (39, 48) côté boîtier. Une chambre d'arrivée (90) est située en amont du siège de soupape (39) de l'élément soupape extérieur (34). L'objectif de l'invention est d'assurer une commande fiable et simple de l'élément soupape intérieur (42). A cet effet, un canal de pression (58) est ménagé dans l'élément soupape intérieur (42), ledit canal débouchant d'une part au niveau d'une surface d'enveloppe (44) de l'élément soupape intérieur et communiquant d'autre part avec une chambre de pression (62) qui est délimitée par une surface de pression (60), agissant dans le sens d'ouverture, de l'élément soupape intérieur (42). La zone où le canal de pression (58) débouche au niveau de la surface d'enveloppe (44) extérieure est recouverte par l'élément soupape extérieur (34) lorsque ce dernier est fermé. Cette zone est ouverte lorsque l'élément soupape extérieur (34) a effectué un mouvement d'ouverture correspondant à une course déterminée (h).
PCT/DE2003/002793 2003-01-08 2003-08-21 Dispositif d'injection de carburant WO2004063553A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10300179.4 2003-01-08
DE2003100179 DE10300179A1 (de) 2003-01-08 2003-01-08 Kraftstoff-Einspritzvorrichtung

Publications (1)

Publication Number Publication Date
WO2004063553A1 true WO2004063553A1 (fr) 2004-07-29

Family

ID=32519647

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2003/002793 WO2004063553A1 (fr) 2003-01-08 2003-08-21 Dispositif d'injection de carburant

Country Status (2)

Country Link
DE (1) DE10300179A1 (fr)
WO (1) WO2004063553A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TR200402050A2 (tr) * 2004-08-18 2006-03-21 Robert Bosch Gmbh Eşeksenli alansal temaslı çift oturma çaplı enjektör
TR200402048A1 (tr) * 2004-08-18 2006-03-21 Robert Bosch Gmbh Hidrolik kontrollü değişken kesitli enjektör memesi.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2710216A1 (de) * 1977-03-09 1978-09-14 Bosch Gmbh Robert Kraftstoffeinspritzduese
DE2753953A1 (de) * 1977-12-03 1979-06-07 Daimler Benz Ag Verfahren zum betrieb einer luftverdichtenden selbstzuendenden brennkraftmaschine sowie geeignetes einspritzventil
JPH07324661A (ja) * 1994-05-30 1995-12-12 Mitsubishi Motors Corp 直接噴射式ディーゼルエンジンの燃料噴射方法及び燃料噴射ノズル
US5899389A (en) * 1997-06-02 1999-05-04 Cummins Engine Company, Inc. Two stage fuel injector nozzle assembly
EP1063416A2 (fr) * 1999-06-25 2000-12-27 Delphi Technologies, Inc. Injecteur de carburant
EP1063417A1 (fr) * 1999-06-24 2000-12-27 Delphi Technologies, Inc. Injecteur à combustible

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2710216A1 (de) * 1977-03-09 1978-09-14 Bosch Gmbh Robert Kraftstoffeinspritzduese
DE2753953A1 (de) * 1977-12-03 1979-06-07 Daimler Benz Ag Verfahren zum betrieb einer luftverdichtenden selbstzuendenden brennkraftmaschine sowie geeignetes einspritzventil
JPH07324661A (ja) * 1994-05-30 1995-12-12 Mitsubishi Motors Corp 直接噴射式ディーゼルエンジンの燃料噴射方法及び燃料噴射ノズル
US5899389A (en) * 1997-06-02 1999-05-04 Cummins Engine Company, Inc. Two stage fuel injector nozzle assembly
EP1063417A1 (fr) * 1999-06-24 2000-12-27 Delphi Technologies, Inc. Injecteur à combustible
EP1063416A2 (fr) * 1999-06-25 2000-12-27 Delphi Technologies, Inc. Injecteur de carburant

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 04 30 April 1996 (1996-04-30) *

Also Published As

Publication number Publication date
DE10300179A1 (de) 2004-07-22

Similar Documents

Publication Publication Date Title
EP1654455B1 (fr) Soupape de commande pour un injecteur de carburant contenant un multiplicateur de pression
EP1654456B1 (fr) Dispositif d'injection de carburant pour moteur a combustion interne
EP1552135B1 (fr) Dispositif d'injection de carburant destine a un moteur a combustion interne
WO2005052354A1 (fr) Dispositif d'injection de carburant destine a un moteur a combustion interne, notamment a un moteur a combustion interne a injection directe, et procede de fabrication
EP1379775A1 (fr) Soupape pour commander le passage de fluides
EP1952011B1 (fr) Dispositif d'injection de carburant pour moteur a combustion interne a injection directe de carburant
EP1381774B1 (fr) Dispositif d'injection de carburant comprenant deux elements de soupape coaxiaux
DE10058130A1 (de) Kraftstoffeinspritzsystem für Brennkraftmaschinen
DE10031580A1 (de) Druckgesteuertes Steuerteil für Common-Rail-Injektoren
EP1651858B1 (fr) Dispositif d'injection de carburant pour moteur a combustion interne
DE10164123A1 (de) Kraftstoff-Einspritzvorrichtung
WO2004063553A1 (fr) Dispositif d'injection de carburant
EP1671029A2 (fr) Dispositif d'injection de carburant, notamment pour un moteur a combustion interne a injection directe de carburant
DE10160490B4 (de) Kraftstoff-Einspritzvorrichtung, Kraftstoffsystem sowie Brennkraftmaschine
WO2003031803A1 (fr) Dispositif d'injection de carburant, en particulier injecteur pour moteurs a combustion interne a injection directe, et systeme de carburant et moteur a combustion interne y relatifs
DE10344942B4 (de) Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine
EP1654454B1 (fr) Dispositif d'injection de carburant pour moteur a combustion interne
WO2001014721A1 (fr) Dispositif d'injection de carburant pour moteurs a combustion interne
WO2006079425A1 (fr) Système d'injection de carburant
WO2005017342A1 (fr) Dispositif d'injection de carburant destine notamment a un moteur a combustion interne a injection directe
DE102004042558B4 (de) Kraftstoffinjektor mit einer von einer Servoventileinheit gesteuerten Registerdüse
WO2005014998A1 (fr) Dispositif d'injection de carburant notamment destine a un moteur a combustion interne a injection de carburant directe
DE10314011A1 (de) Einpritzventil
DE10245736A1 (de) Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine sowie Verfahren zum Betreiben einer Brennkraftmaschine

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CN JP

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR

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

WWW Wipo information: withdrawn in national office

Country of ref document: JP