EP1802863B1 - Kraftstoffeinspritzventil für brennkraftmaschinen - Google Patents

Kraftstoffeinspritzventil für brennkraftmaschinen Download PDF

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Publication number
EP1802863B1
EP1802863B1 EP05740328.9A EP05740328A EP1802863B1 EP 1802863 B1 EP1802863 B1 EP 1802863B1 EP 05740328 A EP05740328 A EP 05740328A EP 1802863 B1 EP1802863 B1 EP 1802863B1
Authority
EP
European Patent Office
Prior art keywords
valve
fuel
injection
valve seat
pressure chamber
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.)
Not-in-force
Application number
EP05740328.9A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1802863A1 (de
Inventor
Markus Ohnmacht
Werner Teschner
Andreas Koeninger
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 EP1802863A1 publication Critical patent/EP1802863A1/de
Application granted granted Critical
Publication of EP1802863B1 publication Critical patent/EP1802863B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8069—Fuel injection apparatus manufacture, repair or assembly involving removal of material from the fuel apparatus, e.g. by punching, hydro-erosion or mechanical operation
    • 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

Definitions

  • the present invention is based on a fuel injection valve for internal combustion engines, as is apparent from the Laid-open specification DE 39 20 315 A1 is known.
  • a fuel injection valve has a valve needle arranged in a pressure chamber, which interacts with a valve seat for controlling a fuel flow to mostly a plurality of injection bores.
  • the injection holes are in this case downstream of the valve seat in the flow direction and extend in the housing of the fuel injection valve, wherein they have an inlet opening at the inflow end and an outlet opening at the outlet end.
  • the inlet openings are formed in the wall of the pressure chamber, so that the fuel located in the pressure chamber can be injected through the injection holes in the combustion chamber of the internal combustion engine.
  • an injection valve which has a plurality of injection bores connected to one another over their entire length.
  • JP S61 159667 U discloses a first injection hole in the blind hole with inlet and outlet openings. From the first bore is a transverse bore, which has its own outlet opening, the inlet opening, however, is connected only via the first bore with the blind hole.
  • a certain fuel flow is achieved, that is, a certain amount of fuel that is ejected per unit time through the injection ports.
  • a certain diameter of the injection holes must not be exceeded, so that the flow must be adjusted substantially over the number of spray holes.
  • the number of injection holes is limited by the diameter of the injection holes on the one hand and the available pitch circle diameter on the other.
  • the staggered arrangement of the injection holes on two bolt circles is often not possible in the confined geometry, as is the case for example with micro-blind-hole nozzles.
  • the fuel injection valve according to the invention with the characterizing features of claim 1, in contrast, has the advantage that a ververtropicte Mixture preparation and thus a higher power of the engine is possible.
  • the inlet openings of the injection holes are arranged so that they overlap or at least touch. This allows more injection wells to accommodate, as would be possible if the inlet openings with the usual web width between them emanated directly from the wall of the blind hole.
  • a blind hole is formed, which has at least substantially the shape of a hemisphere. The blind hole can connect directly to the conical valve seat or be separated by a paragraph of this.
  • the injection holes are arranged so that the inlet openings overlap and thereby a Bohrungsschneschneidung is formed.
  • a high flow rate of the fuel injection valve can be achieved, wherein a large number of outlet openings can be formed with a small diameter, which allow a fine atomization of the fuel.
  • FIG. 1 is a longitudinal section through an inventive fuel injection valve shown.
  • the fuel injection valve has a housing 1, which comprises a valve body 3 and a holding body, not shown in the drawing.
  • the individual parts of the housing 1 are pressed against each other by a clamping nut 9, so that a tight connection is created between the individual components.
  • a pressure chamber 11 is formed, which has the shape of a bore 12 in the region facing the combustion chamber, wherein the bore 12 has a longitudinal axis 8.
  • the pressure chamber 11 is in this case limited at its combustion chamber end by a substantially conical valve seat 36, to which a blind hole 38 immediately followed, so that between the blind hole 38 and the valve seat 36, a transition edge 44 is formed.
  • a piston-shaped valve needle 10 is arranged longitudinally displaceable having a substantially conical valve sealing surface 34, with which it cooperates with the conical valve seat 36 and thereby controls the flow of fuel from the pressure chamber 11 in the blind hole 38, wherein the fuel between the valve needle 10th and the wall of the pressure chamber 11 is kept.
  • the valve needle 10 is guided in a central portion of the bore 12, wherein polished sections 17 are provided in this area, which allow a flow of fuel through the pressure chamber 11 in the direction of the valve seat 36 and the blind hole 38.
  • a pressure shoulder 13 is formed, on which a pressure directed away from the valve seat 36 force is exerted on the valve needle 10.
  • the bore 12 widens at the valve seat facing away from the end to a spring chamber 14, in which a closing spring 16 between a valve needle 10 surrounding sleeve 18 and a shoulder on the valve needle 10 is arranged under pressure bias.
  • the closing spring 16 acts on the valve needle 10 in the direction of the valve seat 36, so that - in the absence of further forces - the valve sealing surface 34 is pressed against the valve seat 36, thereby sealing the blind hole 38 against the pressure chamber 11.
  • the spring chamber 14 can be filled with fuel under high pressure, wherein the pressure, due to the polished sections 17, continues through the entire pressure chamber 11 to the valve seat 36.
  • a control chamber 20 is limited, which is filled with fuel and whose pressure is controlled by a control valve.
  • a control valve Depending on the pressure in the control chamber results in a more or less large force on the valve seat facing away from the end face of the valve needle 10, which can be controlled via the control valve.
  • In the pressure chamber 11 prevails in operation of the internal combustion engine constantly high pressure, which corresponds to the injection pressure.
  • the valve needle 10 driven by the hydraulic force, moves away from the valve seat 36 on the pressure shoulder 13 and releases a cross section between the valve seat 36 and the valve sealing face 34, through the fuel from the pressure chamber 11 to the Injection holes 40 can flow.
  • the pressure in the control chamber 20 is increased again, so that the valve needle 10 is pressed back into contact with the valve seat 36 and interrupts the fuel flow to the injection openings 40
  • FIG. 2 shows an enlargement of FIG. 1 in the region of the valve seat 36 together with a plan view along the line II-II on the blind hole 38.
  • the valve needle 10 is not shown here for clarity.
  • the blind hole 38 connects, the wall has substantially the shape of a truncated cone.
  • a plurality of injection bores 40 extend in a star shape, each having an inlet opening 41 and an outlet opening 42, wherein the outlet openings 42 are arranged on the outside of the fuel injection valve.
  • the inlet openings 41 are arranged in the wall of the blind hole 38 so that they just touch.
  • valve needle 10 lifts off from the valve seat 36, fuel flows from the pressure chamber 11 between the valve sealing surface 34 and the valve seat 36 into the blind hole 38, where the fuel flows through the inlet openings 41 into the injection holes 40 and is finally injected through the outlet openings 42 into the combustion chamber.
  • the inlet openings 42 are arranged with respect to the longitudinal axis of the bore 12 at the same height, they form a bolt circle having a pitch diameter D.
  • the shape of the blind hole 38 is at least substantially hemispherical.
  • the blind hole 38 unlike in the FIG. 2 shown to be formed substantially smaller in relation to the valve needle 10, which is the case in particular in so-called micro-blind hole nozzles
  • FIG. 3 shows a further embodiment of a fuel injection valve according to the invention, wherein the same representation as in FIG. 2 was chosen. Since the very thin webs between the injection holes 40 are relatively unstable in the region of the blind hole, they were partially removed here by a rounding process, so that the effective pitch circle diameter D increases. The removed webs thus results in a recess in the blind hole 38, which increases the effective pitch circle diameter D.
  • FIG. 4 shows a further embodiment in the same representation as FIG. 3 in which the fuel injection valve is designed as a seat hole nozzle.
  • the blind hole is omitted here and instead of the injection holes go 40 directly from the valve seat 36, wherein the valve needle 10 upstream of the injection holes 40 touches on the valve seat 36.
  • the injection holes 40 are again in number and size such that their inlet openings 41 just touch, as long as the webs between the injection holes 40 are not removed.
  • FIG. 4 shows the state after the removal of the webs in the region of the valve seat 36 shown so that in plan view a very similar shape as in FIG. 3 results.
  • FIG. 5 shows a further embodiment of the fuel injection valve according to the invention, in which case the webs between the injection holes 40 have been removed by an erosion process.
  • a recess is formed, which leads in a plane around the entire circumference of the blind hole 38, so that a large number of injection holes 40 can be accommodated in the resulting large pitch circle diameter.
  • an electroerosive method can be used, which in FIG. 4 is indicated.
  • a correspondingly bent erosion tool 55 is moved in rotation, so that the recess is formed by material removal on the wall of the blind hole 38.
  • FIG. 6 shows in a cross section through a fuel injection valve at the level of the blind hole 38 another way to arrange the injection holes 40.
  • the inlet openings 41 of the injection holes 40 overlap almost completely, so that a bore intersection is formed.
  • a large number of outlet openings 42 can be accommodated with a relatively large web width between the blind bores 46, via which the fuel is ultimately injected into the combustion chamber.
  • the resulting Y-shaped bore intersection can be smoothed by employing a hydroerosive rounding method or other rounding method at the edges.
  • the flow resistance is reduced when passing the fuel from the blind hole 38 in the injection holes 40, which increases the effective injection pressure.
  • the edges in the remaining bore intersections and transitions illustrated in the previous embodiment may be rounded by a similar method.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)
EP05740328.9A 2004-07-09 2005-05-12 Kraftstoffeinspritzventil für brennkraftmaschinen Not-in-force EP1802863B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004033283A DE102004033283A1 (de) 2004-07-09 2004-07-09 Kraftstoffeinspritzventil für Brennkraftmaschinen
PCT/EP2005/052162 WO2006005642A1 (de) 2004-07-09 2005-05-12 Kraftstoffeinspritzventil für brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP1802863A1 EP1802863A1 (de) 2007-07-04
EP1802863B1 true EP1802863B1 (de) 2017-07-12

Family

ID=34966963

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05740328.9A Not-in-force EP1802863B1 (de) 2004-07-09 2005-05-12 Kraftstoffeinspritzventil für brennkraftmaschinen

Country Status (5)

Country Link
EP (1) EP1802863B1 (ja)
JP (1) JP2008506059A (ja)
CN (1) CN1981130B (ja)
DE (1) DE102004033283A1 (ja)
WO (1) WO2006005642A1 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5662238B2 (ja) * 2011-05-12 2015-01-28 株式会社日本自動車部品総合研究所 インジェクタ

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61159667U (ja) * 1985-03-26 1986-10-03
JPH0299758A (ja) * 1988-10-07 1990-04-11 Hitachi Ltd ガソリンエンジンの燃料供給装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3920315A1 (de) 1988-07-06 1990-01-11 Avl Verbrennungskraft Messtech Kraftstoffeinspritzduese
JPH0240977U (ja) * 1988-09-13 1990-03-20
DE19609218B4 (de) * 1996-03-09 2007-08-23 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
JP3505996B2 (ja) * 1998-03-19 2004-03-15 トヨタ自動車株式会社 内燃機関用燃料噴射弁
GB9903496D0 (en) * 1999-02-16 1999-04-07 Lucas Ind Plc Fuel injector
DE10031265A1 (de) * 2000-06-27 2002-01-10 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61159667U (ja) * 1985-03-26 1986-10-03
JPH0299758A (ja) * 1988-10-07 1990-04-11 Hitachi Ltd ガソリンエンジンの燃料供給装置

Also Published As

Publication number Publication date
WO2006005642A1 (de) 2006-01-19
DE102004033283A1 (de) 2006-02-02
JP2008506059A (ja) 2008-02-28
CN1981130A (zh) 2007-06-13
CN1981130B (zh) 2012-07-04
EP1802863A1 (de) 2007-07-04

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