EP1921306A2 - Corps d'injecteur doté d'un réservoir de carburant - Google Patents

Corps d'injecteur doté d'un réservoir de carburant Download PDF

Info

Publication number
EP1921306A2
EP1921306A2 EP07116187A EP07116187A EP1921306A2 EP 1921306 A2 EP1921306 A2 EP 1921306A2 EP 07116187 A EP07116187 A EP 07116187A EP 07116187 A EP07116187 A EP 07116187A EP 1921306 A2 EP1921306 A2 EP 1921306A2
Authority
EP
European Patent Office
Prior art keywords
nozzle body
fuel injector
storage volume
spaces
fuel
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.)
Withdrawn
Application number
EP07116187A
Other languages
German (de)
English (en)
Other versions
EP1921306A3 (fr
Inventor
Hans Brekle
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 EP1921306A2 publication Critical patent/EP1921306A2/fr
Publication of EP1921306A3 publication Critical patent/EP1921306A3/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • 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
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • 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
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
    • 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
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator

Definitions

  • the holding bodies of the previously used fuel injectors are exposed to a high pressure level, as a rule to the system pressure level of more than 1600 bar. Consequently, in the case of the storage bores formed in the holding body of a fuel injector, problems of strength occur in the region of bore cuts in the holding body of the fuel injector, which can have a negative influence on its long-term load capacity, taking into account the peak pressures that occur.
  • the valve plate For connecting the at least one storage bore, which is provided in the holding body of the fuel injector, there is either the possibility to design the valve plate so that it has on its side facing the holding body at the point where the storage bore in the holding body, corresponding additional holes.
  • the connection to the high pressure feedthrough in the valve plate is achieved in this case via a throttle bore in each additional hole; and alternatively, it is possible to provide the valve plate on its side facing the holding body, at the point where sit in the holding body, the storage holes to be provided with throttle grooves, which then the connection to the high pressure feedthrough in the valve plate is achieved.
  • the throttling grooves can also be provided in the holding body.
  • valve plate The modification of the valve plate is only the connection of the storage hole to the high pressure side. Due to the fact that bore intersections are realized within the fuel injector, these are mechanically reinforced by using a different material with regard to their continuous load capacity.
  • the nozzle body of a fuel injector is generally the component in which the injection openings at the combustion chamber end of the fuel injector releasing or occluding, preferably needle-shaped injection valve member is slidably received in the vertical direction. Due to the simple geometry of the nozzle body of the fuel injector, storage bores, for example, can be distributed in a circular manner in a region of thicker wall thickness of the nozzle body. For this purpose, an upper annular surface of the nozzle body offers, which can be screwed in the mounted state of the fuel injector with the holding body of the fuel injector by a union nut or nozzle retaining nut.
  • the plurality, substantially circular formed in the material of the nozzle body storage holes, which have seen each other small distance in the circumferential direction, directly to the held in the holding body, and standing under high system pressure fuel are connected. Due to the laying of the at least one storage bore in the nozzle body of the fuel injector, the impairments of the fatigue strength in the region of the holding body associated with the bore intersections are avoided.
  • the solution proposed by the invention in which the at least one storage bore is laid in the nozzle body to equip in previously memoryless trained fuel injectors by simply replacing with the inventively proposed nozzle body with a storage volume, which the aforementioned multiple injections and the required Provision of a pressurized fuel system under system pressure allows.
  • a memory end plate covering the nozzle body needs, following the solution proposed according to the invention, not to be provided with additional holes to ensure their connection to the mounted with the nozzle body holding body, also a special material selection, which takes into account the complex geometry of Bohrungsverschneidungen, no longer necessary.
  • the proposed solution according to the invention also has the advantage that in a region with thicker material thickness of the nozzle body as inventively proposed arranged storage holes to the axial length of the nozzle body and thus depending on the depth of the axially extending in the nozzle body storage holes, the stored therein storage volume of system pressure Increase fuel.
  • the storable storage volume inventively proposed fuel injector can be realized by inserting a memory extension serving as an auxiliary storage, the e.g. can be installed between the nozzle body and the storage volume drain body.
  • Figure 1 shows a nozzle body of a fuel injector according to the prior art.
  • FIG. 1 shows a nozzle body 30 of a fuel injector 10.
  • a preferably needle-shaped injection valve member 12 in the vertical direction is movable up and down.
  • the preferably needle-shaped injection valve member 12 releases at least one injection opening 14 at the combustion chamber end nozzle body 30 or closes it.
  • a seat 16 is formed at the combustion chamber end of the nozzle body 30, in which the preferably needle-shaped injection valve member 12 is provided for closing the at least one injection opening 14.
  • the injection valve member 12 has a shim 20 on which a guided on a pin 22 biasing spring 18 is supported, via which preferably the needle-shaped injection valve member 12 is placed in the seat 16.
  • the inventively proposed increase in the storage volume can be realized in actuated by a solenoid valve fuel injectors or primarily in fuel injectors, which are directly or indirectly actuated by means of a piezoelectric actuator.
  • the nozzle body 30 is formed in the region of the cavity 36 in a second increased wall thickness 34 in comparison to a first wall thickness 32.
  • Figure 2 shows a plan view of the nozzle body shown in Figure 1 of a fuel injector according to the prior art.
  • FIG. 2 shows that the nozzle body 30 has an end face 54 on its side facing away from the combustion chamber-side end.
  • the end face 54 surrounds the component 24 shown in Figure 2 circular.
  • FIG. 3 shows a section through the nozzle body proposed according to the invention for a fuel injector.
  • the nozzle body is formed in a second, increased wall thickness 34 in the region of the cavity 36, which is filled on the inlet side with fuel under system pressure.
  • the second wall thickness 34 of the nozzle body 30 exceeds the first wall thickness 32 of the nozzle body 30 in the area that below the shim 20 on the preferably needle-shaped injection valve member 12 is located.
  • the nozzle body 30 proposed according to the invention comprises an additional storage volume 42.
  • the storage volume 42 comprises the spaces 44 and 46, respectively, in the sectional plane of the nozzle body 30 in FIG. 3, which are designed as bores in this embodiment variant ,
  • the spaces 44, 46 extend from the end face 54 of the nozzle body 30 in the direction of the combustion chamber end of the nozzle body 30.
  • two spaces 44, 46 are dargterrorism, which are opposite each other.
  • the spaces 44, 46 shown in FIG. 3 are distributed along a pitch circle 52 on the end face 54 of the nozzle body 30. Along this pitch circle 52 a plurality of circumferentially spaced apart spaces can be performed.
  • each of these blind bores can have a bore diameter 48 in the range of a few millimeters, with each of the spaces 44 designed as bores , 46 can be made at a depth 50 that is, for example, in the range of 10 mm and more.
  • Such a trained, additional storage volume 42 in the nozzle body 30, disposed around the cavity 36 in the nozzle body 30, can absorb a fuel volume in the order of more than 300 mm 3 , so that for multiple injections in accordance with the invention proposed nozzle body 30 of the fuel injector 10 a sufficient, under Systemtik standing fuel volume can be stored.
  • the end face 54 of the nozzle body 30 is covered by a preferably disc-shaped storage end plate 40 at the end facing away from the at least one injection opening 14.
  • the fuel injector is one which can be actuated via a piezoactuator which is accommodated in the head region of the fuel injector, then the annular space extending around a spring plate 24 (in the case of a fuel injector with piezoactuator actuation) is in direct communication with the high-pressure bore extending in the injector body and is filled over this.
  • the storage volume 42 communicates with this annulus via the at least one radial recess 56 and the at least one rectangular groove 58 in connection.
  • the preferably designed as bores first and second spaces 44, 46, 46.n are hydraulically connected to each other via the peripheral recess 60, which is preferably formed as a circular groove 62.
  • nozzle body 30 proposed according to the invention as shown in the sectional views in FIG. 3, deep hole bores in the holding body of the fuel injector 10, which is mounted above the nozzle body 30 on the fuel injector 10, can advantageously be avoided, in which, as a rule, a bore ground which is difficult to machine arises. Furthermore, by laying the storage volume 42 as shown in FIG. 3 into the nozzle body 30, it can be avoided that strength problems in the area of bore intersections and unsuitable bore ground in the holding body occur.
  • connection of the storage volume 42 of the nozzle body 30 shown in Figure 3 to the holding body can be carried out in an advantageous manner via the memory end plate 40, which is generally disc-shaped.
  • the connection of the storage volume 42 in the nozzle body 30 can be seen in the illustration according to FIG.
  • FIG. 4 shows the plan view of the nozzle body of the fuel injector proposed according to the invention before drilling.
  • FIG. 5 shows a plan view of the nozzle body of the fuel injector proposed according to the invention.
  • FIG. 5 shows that a number of spaces 44, 46, 46.n are introduced into the end face 54, formed in the second raised wall thickness 34.
  • the plurality of spaces 44, 46, 46.n are arranged on the front side 54 of the nozzle body 30 along a pitch circle 52 whose pitch circle diameter is identified by reference numeral 53. From the illustration according to FIG. 5, it can be seen that the individual spaces 44, 46 46.n each have a bore diameter 48 and are embodied in the bore depth 50 shown in FIG.
  • the pitch circle 52 extends essentially in the middle of the end face 54 of the nozzle body 30.
  • the individual spaces 44, 46 are preferably designed as bores starting from the "three o'clock" position in a first angular position 64, in a second angular position 66 and in a third angular position 68 are arranged.
  • the jump in relation to the arrangement angle between the second angular position 66 and the third angular position 66 results from the contour formed in the wall of the nozzle body 30.
  • a fourth angular position 70 in a fifth angular position 72, in a sixth angular position 74, in a seventh angular position 76, in an eighth angular position 78, in a ninth angular position 80 and arranged in a tenth angular position 82.
  • the angular jump between the tenth angular position 82 and the first angular position 64 results from the contour in the lateral surface of the nozzle body 30 mentioned at the beginning. From the top view according to FIG. in that spaces 44, 46 46.n in the end face 54 of the nozzle body 30, which are designed as bores, communicate with one another via the circumferential recess 60 extending in the circumferential direction, which is preferably designed as a circular groove 62.
  • a radial recess 56 In addition, compare detail X, of the first bore 44 in the second angular position 66, a radial recess 56.
  • a circumferential recess 60 connects the individual spaces 44, 46, 46.n within the storage volume 42 with each other.
  • the radial recess 56 serves to connect the additional storage volume 42 to the cavity 36, both for its filling during the injection pauses and for stabilizing the injection process, i. the actual function of the additional storage volume 42.
  • the serving as a throttle at least one radial recess 56 may be formed one or more times in the end face 54.
  • the radial recess 56 can also open into the at least one circumferential recess 60.
  • the task of the radial recess 60 is to provide a throttle connection between the storage volume 42 and the cavity 36.
  • the at least one formed in the end face 54 of the nozzle body 30 radial recess 56 is preferably designed as a rectangular groove 58.
  • Each of the illustrated in Figure 5, preferably designed as bores spaces 44, 46 46.n is connected via such a radial recess 56 with the cavity 36 in connection, so that the storage volume 42, given by the number of spaces along the pitch circle 52, with can be filled under system pressure fuel.
  • the circumferential recess 60 shown in detail Y which is preferably formed as a circular groove 62.
  • the individual chambers 44, 46, 46.n of the storage volume 42 are also filled via the circular groove 62 in the nozzle body 30 of the fuel injector 10 proposed according to the invention.
  • the radial recess 56 is preferably designed as a rectangular groove 58, with a depth 86 and a width 88 in the order of 0.15 mm.
  • the bore diameter 48 of all preferably designed as bores spaces 44, 46, 46.n is on the order of a few millimeters.
  • Detail Y is shown that the preferably formed as a circular groove 62 circumferential recess 60 has a depth 86 and a width 88 in the order of 0.15 mm.
  • radial recesses 56 can each extend. Via the circumferential recess 60, which extends along the pitch circle 52, the spaces 44, 46, 46.n, which are preferably in the form of bores, are filled with the fuel under system pressure.
  • the at least one radial recess 56 and the circumferential recess 60 run in the end face 54 of the nozzle body 30.
  • the at least one radial recess 56 and the peripheral recess 60 act upon the chambers 44, 46 which are preferably formed as bores , 46.n in the nozzle body 30 with fuel under system pressure, can alternatively also be formed on the underside of the storage end plate 40 resting on the end face 54 of the nozzle body, as shown in FIG.
  • the hydraulic connection of the storage volume 42 takes place by means of production technology simple rectangular grooves 58 or circular grooves 62, as shown in the embodiment variant according to FIG.
  • FIG. 6 shows a variant embodiment of the solution proposed according to the invention, in which a substantially sleeve-shaped extension part 90 has at least one first space 44 and at least one second space 46 of an enlarged storage volume 84.
  • the extension part 90 shown in FIG. 6 can, for example, be applied in a simple manner to increase the storage volume 42 on a nozzle body 30.
  • an increase in the storage volume 42 to an increased storage volume 84 can be achieved on the one hand in the case of fuel injectors 10 which have the nozzle body 30 proposed according to the invention, and on the other hand, a nozzle body 30 can also be retrofitted without a storage volume as shown in FIG be equipped with an additional storage volume 84.
  • the extension part 90 shown in Figure 6 is preferably formed sleeve-shaped, wherein the darg Congressen in Figure 6 spaces 44, 46 along the pitch circle diameter 53 of the pitch circle 52 - as shown in Figure 5 - run.
  • the cavity of the extension part 90 is designated, which is aligned with the cavity 46 in the upper region of the nozzle body 30.
  • FIGS. 3 which has a substantially disc-shaped design, and the at least one radial recess 56 and the peripheral recess 60 formed on the underside of the storage end plate 40, and the at least one radial recess 56 and the peripheral recess 60, respectively, shown in FIG on the end face 54 of the storage body 30, the storage volume 42 can be connected in a particularly simple manner to the prevailing in the holding body of the fuel injector 10 system pressure.
  • a further possible embodiment is given by the spaces 44, 46, 46.n, whose function has been explained above and which represent the storage volume 42 or the increased storage volume 84, the storage volume 42 or 84 to realize by a circumferential, annular recess around the cavity 36 in the nozzle body 30.
  • a continuous storage volume 42 can be executed in the region of the nozzle body 30 which is formed in the second, increased wall thickness 34.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP07116187A 2006-11-08 2007-09-12 Corps d'injecteur doté d'un réservoir de carburant Withdrawn EP1921306A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610052636 DE102006052636A1 (de) 2006-11-08 2006-11-08 Düsenkörper mit Speicherbohrungen

Publications (2)

Publication Number Publication Date
EP1921306A2 true EP1921306A2 (fr) 2008-05-14
EP1921306A3 EP1921306A3 (fr) 2009-08-26

Family

ID=39007422

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07116187A Withdrawn EP1921306A3 (fr) 2006-11-08 2007-09-12 Corps d'injecteur doté d'un réservoir de carburant

Country Status (2)

Country Link
EP (1) EP1921306A3 (fr)
DE (1) DE102006052636A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009004680A1 (de) 2009-01-12 2010-07-15 L'orange Gmbh Einspritzdüse mit einem Düsenkörper

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10257691A1 (de) * 2002-12-10 2004-06-24 Siemens Ag Injektor für eine Brennkraftmaschine
DE102004005452A1 (de) * 2004-02-04 2005-08-25 Robert Bosch Gmbh Düsenhalterkombination mit direktgesteuertem Einspritzventilglied
EP1770275A1 (fr) * 2005-09-29 2007-04-04 Robert Bosch Gmbh Injecteur à trous avec un volume de retenue pour un dispositif d'injection de carburant

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10257691A1 (de) * 2002-12-10 2004-06-24 Siemens Ag Injektor für eine Brennkraftmaschine
DE102004005452A1 (de) * 2004-02-04 2005-08-25 Robert Bosch Gmbh Düsenhalterkombination mit direktgesteuertem Einspritzventilglied
EP1770275A1 (fr) * 2005-09-29 2007-04-04 Robert Bosch Gmbh Injecteur à trous avec un volume de retenue pour un dispositif d'injection de carburant

Also Published As

Publication number Publication date
EP1921306A3 (fr) 2009-08-26
DE102006052636A1 (de) 2008-05-15

Similar Documents

Publication Publication Date Title
EP1584813A2 (fr) Injecteur pour moteur à combustion avec une aiguille d'injection contrôlée directement
EP1771651A1 (fr) Injecteur de carburant a commande polyetagee directe de l'element de soupape d'injection
DE112008003553T5 (de) Motor und Steuerventilanordnung mit reduzierter Variabilität der Betriebsüberzeit
WO2004033891A1 (fr) Dispositif d'injection de carburant destine a un moteur a combustion interne
DE102006015745A1 (de) Kraftstoffinjektor mit direktgesteuertem Einspritzventilglied
DE19904720C2 (de) Injektor für eine Einspritzanlage einer Brennkraftmaschine
EP1117921B1 (fr) Injecteur de carburant pour un système carburant à rampe commune
WO2003004856A1 (fr) Injecteur de carburant avec mise en forme de la courbe d'injection au moyen d'elements d'etranglement commandes
DE102006036446A1 (de) Injektor für ein Kraftstoffeinspritzsystem
EP1921306A2 (fr) Corps d'injecteur doté d'un réservoir de carburant
EP1273792B1 (fr) Injecteur de combustible avec admission résistant aux pressions élevées
DE19732070A1 (de) Direkteinspritzendes Kraftstoffeinspritzventil mit Magnetventilsteuerung für eine mehrzylindrige Brennkraftmaschine
EP2439398B1 (fr) Soupape d'injection de combustible
EP1527272B1 (fr) Injecteur de carburant comprenant une zone de raccordement resistant a haute pression
DE102009001176A1 (de) Kraftstoffeinspritzventil
DE10147830B4 (de) Kraftstoffinjektor
EP1483499A1 (fr) Systeme pour moduler en pression le comportement d'injection
WO2004005699A1 (fr) Injecteur pour un systeme d'injection
EP1415082A1 (fr) Injecteur de carburant a commande de distributeur a 2 voies
EP2655850B1 (fr) Injecteur de carburant pour moteurs à combustion interne
WO2017005556A1 (fr) Injecteur pour système d'injection de carburant
DE102005057748A1 (de) Düsenbaugruppe für ein Einspritzventil
DE102007013248A1 (de) Druckausgeglichenes Schaltventil
DE102007001365A1 (de) Injektor mit Steuer- und Schaltkammer
EP2726731B1 (fr) Injecteur de carburant

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

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

AX Request for extension of the european patent

Extension state: AL BA HR MK RS

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

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

AX Request for extension of the european patent

Extension state: AL BA HR MK RS

17P Request for examination filed

Effective date: 20100226

17Q First examination report despatched

Effective date: 20100401

AKX Designation fees paid

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

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20100811