EP1382840A1 - Soupape d'injection de carburant pour un moteur a combustion interne - Google Patents

Soupape d'injection de carburant pour un moteur a combustion interne Download PDF

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Publication number
EP1382840A1
EP1382840A1 EP03009122A EP03009122A EP1382840A1 EP 1382840 A1 EP1382840 A1 EP 1382840A1 EP 03009122 A EP03009122 A EP 03009122A EP 03009122 A EP03009122 A EP 03009122A EP 1382840 A1 EP1382840 A1 EP 1382840A1
Authority
EP
European Patent Office
Prior art keywords
valve
injection
fuel
inlet opening
valve needle
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.)
Granted
Application number
EP03009122A
Other languages
German (de)
English (en)
Other versions
EP1382840B1 (fr
Inventor
Oliver Heinold
Gerhard Suenderhauf
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 EP1382840A1 publication Critical patent/EP1382840A1/fr
Application granted granted Critical
Publication of EP1382840B1 publication Critical patent/EP1382840B1/fr
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
    • 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
    • F02M61/1893—Details of valve member ends not covered by groups F02M61/1866 - F02M61/188
    • 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
    • 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
    • F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging 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
    • F02M61/16—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

Definitions

  • the invention relates to a fuel injection valve for Internal combustion engines from, as is the genus of the claim 1 corresponds.
  • Such fuel injectors are known from the prior art. So the DE 196 shows 09 218 A1 a fuel injector that has a valve body with a bore. The hole will be on her combustion chamber end bounded by a conical valve seat, from which several injection channels branch off into the Combustion chamber of the internal combustion engine open. In the hole a valve needle arranged longitudinally displaceable, with a also conical valve sealing surface cooperates with the valve seat and so the fuel flow to the injection channels controls.
  • injection channels are preferred here evenly over the circumference of the fuel injector distributed and there is within the injection channels an even flow of fuel. This achieves a high penetration depth of the fuel jet in the combustion chamber, what with large combustion chambers and thus large displacement for a quick distribution of the Fuel leads to good combustion.
  • a high penetration depth of the fuel jets is not always an advantage.
  • a jet of fuel shortly after it emerged strong from the injection channel of the fuel injector atomized in order to distribute the fuel as homogeneously as possible to reach in the combustion chamber.
  • the fuel flow in the injection channel forms a vortex, i.e. a swirl or one Vortex around the longitudinal axis of the substantially cylindrical Injection channel.
  • Such injectors are from the prior art Technology is also known, for example from the published patent application JP 11-082229 A or US 6 065 692.
  • Injectors are grooved in the valve needle or generated a vortex by inserted flow disks, with which the above effects occur.
  • These injectors have the disadvantage, however, that they each have only a single injection port and design for use in modern direct injection Internal combustion engines only suitable to a limited extent are.
  • the fuel injector according to the invention with the characteristic Features of claim 1, however, points the advantage that, as with the known fuel injection valves several injection channels over the circumference of the fuel injection valve can be arranged distributed and creates a vortex in all injection channels becomes. This is the between the valve sealing surface and the Valve seat formed annular gap through which the fuel the injection channels flows, not over the entire circumference equally thick.
  • the fuel flows depending the azimuth angle with respect to the longitudinal axis of the bore, into the injection channels at different speeds, so that at the inlet opening of the injection channels forms a speed gradient in the circumferential direction. This turns the fuel flow into an injection channel Whirling movement offset to the strong above mentioned Atomization of the escaping fuel in the combustion chamber.
  • the valve needle at the level of the inlet openings of the injection channels designed with a cross section that is a triangle with convex corresponds to curved side surfaces. This enables in an inflow characteristic to the Injection channels leading to the desired vortex in the injection channel leads.
  • the configuration is also advantageous the valve needle at the level of the inlet opening of the injection channels in the form of an oval, which also corresponds to the shown Inflow conditions leads.
  • the is also advantageous Design of a valve needle at the level of the inlet openings has a cross section that is a hexagon corresponds, with the inner angle of the adjacent Sides are alternately larger and smaller than 120 °.
  • the Inlet openings are preferably in a radial plane arranged to the longitudinal axis of the bore, so that in the same vortices are generated for all injection channels.
  • the entry openings opposite surface of the valve needle is flattened, whereby the imaginary extension of the injection channels this area the valve needle cuts at an oblique angle.
  • the inflow conditions for each injection channel modify separately.
  • the desired inflow conditions with any number of injection channels.
  • FIG. 1 shows a longitudinal section through an inventive Fuel injection valve, only the combustion chamber side End of the otherwise well known from the prior art Fuel injector is shown.
  • a bore 3 In one Valve body 1 is formed a bore 3, the one Longitudinal axis 4 has.
  • the bore 3 is on its combustion chamber side End of an essentially conical valve seat 5 limited, in which the inlet openings 107 several Injection channels 7 are arranged in the installed position of the Fuel injection valve in the internal combustion engine in the Combustion chamber of the same open.
  • a piston-shaped Valve needle 10 arranged longitudinally displaceable combustion chamber end cooperates with the valve seat 5.
  • the valve needle 10 has a cylindrical section 13, which is followed by a conical section 11, on which in turn a second cylindrical section 16 borders.
  • the fuel under high Pressure can be filled.
  • the closed position of the valve needle 10 that is when the valve sealing surface 12 on the valve seat 5 is present, the injection channels 7 through the valve needle 10 separated from the pressure chamber 8.
  • the open position of the Valve needle 10 that is when the valve sealing surface 12 by a Longitudinal movement of the valve needle 10 is lifted off the valve seat 5 is, fuel flows from the pressure chamber 8 between the Valve sealing surface 12 and the valve seat 5 to the Inlet openings 107 of the injection channels 7 and injected there into the combustion chamber of the internal combustion engine.
  • FIG. 2 shows a cross section along the line AA of FIG. 1 of a fuel injection valve, as is known from the prior art.
  • the valve needle 10 here has a circular shape at the level of the inlet openings 107 of the injection channels 7, six of which are arranged here distributed over the circumference of the valve body 1. In the open position of the valve needle 10, this results in a circular annular gap 17 between the valve needle 10 and the valve seat 5, through which the fuel flows to the injection channels 7.
  • FIG. 2A shows a part of the valve body 1 in a sectional representation in the area of the valve seat 5.
  • an injection channel 7 is shown here, which is shown with an enlarged diameter for clarification.
  • the tangential inlet velocities V L and V R of the fuel are of the same size, so that there is a uniform flow of the fuel in the injection channel 7 and thus the known high penetration depth into the combustion chamber of the internal combustion engine.
  • FIG 3 shows like Figure 2 a cross section along the line A-A of Figure 1 of a first embodiment of the Fuel injection valve according to the invention.
  • the valve needle 10 points at the level of the inlet openings 107 of the injection channels 7 has a shape corresponding to a hexagon, whereby six side surfaces 20 are formed on the valve needle 10 become.
  • the inside angles of the adjoining side surfaces 20 is alternately smaller and larger than 120 °, so that the extension of the injection channels 7 lopsided Angle with the opposite side surface 20 forms.
  • the annular gap 17 thus varies in its width the circumference of the valve body 1.
  • the previously known shape the valve needle 10 is indicated by a dotted line, which means that the width D of the annular gap is not the same everywhere 17 is made clear.
  • the gap between the side surface 20 of the valve needle 10 and the left edge of the inlet opening 107 of the injection channel 7 is smaller than the gap between the right edge of the inlet opening 107 and the side surface 20.
  • injection channels 7 which are located next to the exemplary selected injection channel 7, the speed relationships are reversed as far as the left and right sides of the injection channel 7 are concerned, so that the vortex in these injection channels 7 has an opposite direction of rotation.
  • the tangential speeds v L and v R in all injection channels 7 are indicated by arrows.
  • FIG. 3A shows the inflow conditions at an injection channel 7 of the injection valve shown in FIG. 3 in the same representation as FIG. 2A.
  • the tangential speed components v L and v R lead in the injection channel 7 to a vortex, which rotates counterclockwise as viewed from the inlet opening 107.
  • FIG. 4 shows a further exemplary embodiment of a fuel injection valve according to the invention, again as a cross section along the line AA of FIG. 1.
  • the valve needle 10 here has a triangular shape at the level of the inlet openings 107 of the injection channels 7 with convex, that is to say outwardly curved, side surfaces.
  • Injection channels 7 have different orientations.
  • the smallest width of the annular gap 17 is designated D 1 in FIG. 3, the largest is D 2 .
  • This shape of the valve needle 10 is matched to six injection channels 7, which are arranged evenly distributed over the circumference of the valve body 1.
  • valve needle 10 The usual circular shape of the valve needle 10 is indicated by a dotted line.
  • valve needle 10 has a cross section that corresponds to a triangle with concave, that is to say curved inward, side surfaces.
  • inflow conditions result which lead to a vortex in the injection channels 7 in the manner set out above.
  • FIG. 5 shows another embodiment in the same Representation as in FIG. 4.
  • the valve needle 10 has here Height of the inlet openings 107 a cross-sectional shape, which resembles a circular saw shape.
  • the injection channels 7 are opposite side surfaces 20 of the valve needle 10 with regard to the imaginary extension of the injection channels 7 arranged obliquely, as in the embodiment 3 is the case.
  • the inflow conditions are here however, identical on each injection channel 7, so that the vortex that forms in all injection channels 7 is the same Direction of rotation.
  • Figure 6 shows a further embodiment, here only four injection channels 7 over the circumference of the valve body 1 are distributed. This requires a different shape the valve needle 10, which is at the level of the inlet openings 107 has an oval shape with pointed ends. Here too results from the changing in the circumferential direction Annular gap 17 inflow conditions into the injection channels 7, that create a vortex there.
  • FIG 7 shows a further embodiment of the invention Fuel injector.
  • the valve needle 10 is circular in the area of the inlet openings 107 designed as it is known from the prior art. Instead, the valve seat surface 5 is modified so that there are similar inflow conditions in the injection channels 7 result as with a correspondingly shaped valve needle 10.
  • the valve seat 5 has a shape in cross section, which corresponds to a triangle with concave sides, thus about the shape, the valve needle in Figure 4 10 owns. This configuration has the advantage that the Valve needle 10 can remain unchanged and from the known Fuel injection valves can be taken over. Also the other configurations of the valve needle 10, which in the Figures 3, 5 and 6 are shown in an analogous manner are transferred to the shape of the valve seat 5 at a at the same time circular valve needle 10 in Area of entry openings 107.
  • a vortex is not included all injection channels 7 is desired.
  • This has the advantage that part of the injection channels 7 the fuel Inject far into the combustion chamber while the injection channels atomize the fuel more strongly with Vortex, so that the fuel injected through these injection channels only reached a low depth of penetration.
  • the valve sealing surface 12 is in the area of the other inlet openings 107 designed so that the Inflow conditions over the entire inlet opening 107 are the same, as already shown in Figure 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP03009122A 2002-07-16 2003-04-22 Soupape d'injection de carburant pour un moteur a combustion interne Expired - Lifetime EP1382840B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10232049 2002-07-16
DE10232049A DE10232049A1 (de) 2002-07-16 2002-07-16 Kraftstoffeinspritzventil für Brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP1382840A1 true EP1382840A1 (fr) 2004-01-21
EP1382840B1 EP1382840B1 (fr) 2005-07-27

Family

ID=29761980

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03009122A Expired - Lifetime EP1382840B1 (fr) 2002-07-16 2003-04-22 Soupape d'injection de carburant pour un moteur a combustion interne

Country Status (4)

Country Link
EP (1) EP1382840B1 (fr)
JP (1) JP2004052766A (fr)
KR (1) KR20040010178A (fr)
DE (2) DE10232049A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2891318A3 (fr) * 2005-09-26 2007-03-30 Renault Sas Injecteur de gazole pour moteur a combustion interne
EP3073107A1 (fr) 2015-03-25 2016-09-28 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion interne et utilisation d'une soupape d'injection de carburant

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59136563A (ja) * 1983-01-24 1984-08-06 Daihatsu Motor Co Ltd 燃料噴射ノズル
GB2170269A (en) * 1985-01-26 1986-07-30 Daimler Benz Ag I.c. engine fuel injection valve
DE19609218A1 (de) * 1996-03-09 1997-09-11 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
WO2002031350A2 (fr) * 2000-10-10 2002-04-18 Robert Bosch Gmbh Soupape d'injection de carburant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59136563A (ja) * 1983-01-24 1984-08-06 Daihatsu Motor Co Ltd 燃料噴射ノズル
GB2170269A (en) * 1985-01-26 1986-07-30 Daimler Benz Ag I.c. engine fuel injection valve
DE19609218A1 (de) * 1996-03-09 1997-09-11 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
WO2002031350A2 (fr) * 2000-10-10 2002-04-18 Robert Bosch Gmbh Soupape d'injection de carburant

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 263 (M - 342) 4 December 1984 (1984-12-04) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2891318A3 (fr) * 2005-09-26 2007-03-30 Renault Sas Injecteur de gazole pour moteur a combustion interne
EP3073107A1 (fr) 2015-03-25 2016-09-28 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion interne et utilisation d'une soupape d'injection de carburant
DE102015205423A1 (de) 2015-03-25 2016-09-29 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen und Verwendung des Kraftstoffeinspritzventils

Also Published As

Publication number Publication date
JP2004052766A (ja) 2004-02-19
DE50300845D1 (de) 2005-09-01
DE10232049A1 (de) 2004-02-05
EP1382840B1 (fr) 2005-07-27
KR20040010178A (ko) 2004-01-31

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