WO2007104590A1 - Soupape d'injection de carburant pour moteurs a combustion interne - Google Patents

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

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Publication number
WO2007104590A1
WO2007104590A1 PCT/EP2007/050460 EP2007050460W WO2007104590A1 WO 2007104590 A1 WO2007104590 A1 WO 2007104590A1 EP 2007050460 W EP2007050460 W EP 2007050460W WO 2007104590 A1 WO2007104590 A1 WO 2007104590A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
valve seat
fuel injection
needle
valve needle
Prior art date
Application number
PCT/EP2007/050460
Other languages
German (de)
English (en)
Inventor
Thomas Kuegler
Andreas Kerst
Thilo Kreher
Roland Schulz
Thilo Klingel
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 WO2007104590A1 publication Critical patent/WO2007104590A1/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
    • 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
    • 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

  • valve closing member usually in the form of a valve needle, which cooperates with a valve seat and thus releases or closes one or more injection openings, so that the time of the fuel injection can be accurately determined.
  • the valve needle has a substantially conical valve sealing surface, which cooperates with an equally conical valve seat.
  • the injection openings go directly from the valve seat or from a blind hole, which connects directly to the valve seat.
  • the opening angle of the conical valve seat is about 60 °, wherein the opening angle of the conical sealing surface of the valve needle has about the same size.
  • valve needle In order for sufficient fuel to flow between the sealing surface of the valve needle and the valve seat to the injection openings in order to achieve a corresponding injection rate, the valve needle must pass through a certain minimum stroke. This stroke is in the known injection valve more than 160 microns, since first the area must be overcome, in which the gap between the
  • the fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage over that rapid succession of injections with a high injection pressure are possible.
  • the conical valve seat has an opening angle which is 75 ° to 100 °, preferably 85 ° to 95 °.
  • the valve needle has to travel through a lower stroke until the full injection pressure is reached, so that the maximum lift of the valve needle can be restricted to less than 160 ⁇ m, with the result that the pressure build-up at the injection openings
  • the opening angle of about 90 ° of the conical valve seat also reduces the disturbing forces on the valve needle.
  • Valve needle acting hydraulic forces have a lower desachsieren- de component, so that the risk of misalignment of the valve needle is reduced.
  • the force component of the closing force which acts parallel to the valve seat, compared to the known valve seat is reduced, so that the sealing surface of the valve needle less on the
  • Valve seat slides off, so that reduces the wear in this area.
  • Figure 2 is an enlargement of Figure 1 in the region of the valve seat and
  • valve seat 3 shows a valve seat with associated valve needle, as known from the prior art.
  • FIG. 1 shows a longitudinal section of a fuel injection valve according to the invention.
  • the fuel injection valve has a valve body 1, which is braced by means of a clamping nut 2 with the interposition of a throttle disk 4 against a holding body 3.
  • a pressure chamber 5 is formed, which has the shape of a bore substantially and which is bounded at its brennraumsei- term end of a conical valve seat 11.
  • a longitudinal axis 8 having a piston-shaped valve needle 10 is arranged longitudinally displaceable, which is guided in a guide portion 105 of the pressure chamber 5.
  • the valve needle 10 has at its valve seat end facing a substantially conical sealing surface 7, with which it cooperates with the valve seat 11, so that the fuel flow from the pressure chamber 5 in a blind hole 6, which connects directly to the valve seat 11, interrupted or can be released. From the blind hole 6 go out several injection openings 9, which open in installation position of the fuel injection valve directly into a combustion chamber of the internal combustion engine.
  • valve needle 10 At its valve seat facing away from the end of the valve needle 10 is guided in a sleeve 14, wherein the sleeve 14 is clamped by a closing spring 12 and a support ring 16 against the valve needle 10.
  • a closing spring 12 As a result of the prestressing of the closing spring 12, the valve needle 10, with its sealing surface 7, is pressed against the valve seat 11. - A -
  • a control chamber 22 which is connected via an inlet throttle 24 with an inlet channel 18, via the fuel at high Pressure is supplied to the injection valve.
  • a high fuel pressure in the control chamber 22 is maintained via the inlet channel 18 and the inlet throttle 24, on the other hand, the fuel necessary for the injection of the pressure chamber 5 is also supplied.
  • From the control chamber 22 is an outlet throttle 26 to a control valve 20, connected via the space in the outlet throttle 26 with a non-pressurized Lecköl- or can be separated from this.
  • fuel from the pressure chamber 5 via the control valve 20 and the outlet throttle 26 can be additionally routed to the control chamber 22, if necessary, to quickly get there again a high fuel pressure at a pressure drop.
  • Inlet channel 18 prevails.
  • the high fuel pressure in the control chamber 22 results in a hydraulic force on the valve seat facing away from the end face of the valve needle 10, which presses them with the sealing surface 7 against the valve seat 11.
  • the pressure chamber 5 is hydraulically separated from the blind hole 6, so that the fuel that rests in the pressure chamber 5 does not reach the injection openings 9.
  • the control valve 20 is actuated, and the fuel pressure in the control chamber 22 drops due to the outflow of fuel via the outlet throttle 26, which in turn reduces the hydraulic force on the valve seat facing away from the end of the valve needle 10. Due to the fuel pressure in the pressure chamber 5, hydraulic forces act on the valve needle 10, which are directed away from the valve seat 11.
  • valve needle 10 lifts with its sealing surface 7 from the valve seat 11 so that fuel from the pressure chamber 5 in the blind hole 6 and from there flows into the injection openings 9, through which the fuel is injected into the combustion chamber.
  • control valve is again actuated so that the initial pressure conditions are restored, which press the valve needle 10 back into its closed position.
  • FIG. 2 shows an enlargement in the region of the valve seat of FIG
  • Valve seat 11 has a cone shape, wherein the cone has an opening angle a of 70 ° to 100 °, preferably 85 ° to 95 °, with an opening angle a of 90 ° has proven to be particularly advantageous.
  • the sealing surface 7 of the valve needle 10 here consists of a simple conical surface, which has a slightly larger opening angle than the conical valve seat 11. As a result, the valve needle 10 comes into abutment with the valve seat 11 with a sealing edge 13, so that a high surface pressure in this area and thus a good seal is given.
  • the valve needle 10 In the open position shown in Figure 2, the valve needle 10 has passed through their maximum opening stroke h and is with its valve seat facing away from the end face of a stop 19, which is formed on the throttle plate 4. Characterized the maximum opening stroke h of the valve needle 10 is limited to 100 microns to 120 microns, which is sufficient to ceremoniesberichtnchn a gap sufficient size between the sealing surface 7 and the valve seat 11.
  • Valve needle 10 from its central position in the pressure chamber 5 acts, with the same hydraulic force is lower than in a seat having an opening angle of 60 °.
  • FIG. 3 illustrates an injection valve known from the prior art with a conical valve seat 11, which has an opening angle of 60 °.
  • the closing force F s acting through the pressure in the control chamber 22 can likewise be broken down into two force components, here into a force F 1 perpendicular to the sealing surface 7 and into a force F p parallel to the sealing surface 7.
  • the closing force F s acting parallel to the sealing surface 7 Force Fp causes after placing the sealing surface 7 on the valve seat 11 a slight slipping of the sealing surface 7 on the valve seat 11, which leads to wear there and by the choice of the opening angle of the valve seat 11, for example, 90 °, this force component with respect to a valve seat significantly reduce an opening angle of 60 °, so that the wear in the region of the valve seat 11 is reduced.
  • FIG. 3 a fuel injection valve is shown in FIG. 3, as is known from the prior art, and in which the valve seat 11 has an opening angle of approximately 60 °. Since there are otherwise no technical differences to the embodiment according to the invention, which would be apparent in the drawing, the technical description of Figure 2 applies to the extent to the injection valve of Figure 3.

Abstract

L'invention concerne une soupape d'injection de carburant pour moteurs à combustion interne comprenant un corps de soupape (1), dans lequel est réalisé un espace de pression (5) pouvant être rempli sous haute pression et duquel part au moins une ouverture d'injection (9). Dans l'espace de pression (5) est disposé un pointeau de soupape (10) déplaçable longitudinalement, qui coopère par une surface d'étanchéité (7) avec un siège de soupape conique (11) réalisé dans l'espace de pression (5) pour ouvrir et fermer l'au moins une ouverture d'injection (9). Le pointeau de soupape (10), lors de sa course l'écartant du siège de soupape (11), parvient en appui contre une butée fixe (19) pour fixer la course d'ouverture maximale (h). Dans ce cas, l'angle d'ouverture (a) du siège de soupape conique (11) vaut 75° à 100° et la course d'ouverture maximale (h) du pointeau de soupape (10) vaut 80 à 160 µm.
PCT/EP2007/050460 2006-03-15 2007-01-17 Soupape d'injection de carburant pour moteurs a combustion interne WO2007104590A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006012242.9 2006-03-15
DE200610012242 DE102006012242A1 (de) 2006-03-15 2006-03-15 Kraftstoffeinspritzventil für Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
WO2007104590A1 true WO2007104590A1 (fr) 2007-09-20

Family

ID=37909825

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/050460 WO2007104590A1 (fr) 2006-03-15 2007-01-17 Soupape d'injection de carburant pour moteurs a combustion interne

Country Status (2)

Country Link
DE (1) DE102006012242A1 (fr)
WO (1) WO2007104590A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012223064A1 (de) * 2012-12-13 2014-06-18 Continental Automotive Gmbh Vario-Düsennadel, Vario-Düsenkörper, Vario-Düsenbaugruppe sowie Vario-Kraftstoffinjektor
US9441590B2 (en) 2009-08-28 2016-09-13 Robert Bosch Gmbh Fuel injection valve

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19531652A1 (de) * 1995-08-29 1997-05-07 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
WO2001018387A1 (fr) * 1999-09-04 2001-03-15 Robert Bosch Gmbh Buse d'injection pour moteurs a combustion interne avec pointeau pourvu d'une rainure annulaire
DE10319920A1 (de) * 2002-10-26 2004-05-06 Robert Bosch Gmbh Ventil zum Steuern eines Fluids
DE10320044A1 (de) * 2003-05-06 2004-11-25 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
WO2005014995A1 (fr) * 2003-08-07 2005-02-17 Robert Bosch Gmbh Injecteur pour systemes d'injection de carburant de moteurs a combustion interne, notamment de moteurs diesel a injection directe
DE10338946A1 (de) * 2003-08-25 2005-03-24 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102005000618A1 (de) * 2005-01-03 2006-07-13 Robert Bosch Gmbh Brennstoffeinspritzventil

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19531652A1 (de) * 1995-08-29 1997-05-07 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
WO2001018387A1 (fr) * 1999-09-04 2001-03-15 Robert Bosch Gmbh Buse d'injection pour moteurs a combustion interne avec pointeau pourvu d'une rainure annulaire
DE10319920A1 (de) * 2002-10-26 2004-05-06 Robert Bosch Gmbh Ventil zum Steuern eines Fluids
DE10320044A1 (de) * 2003-05-06 2004-11-25 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
WO2005014995A1 (fr) * 2003-08-07 2005-02-17 Robert Bosch Gmbh Injecteur pour systemes d'injection de carburant de moteurs a combustion interne, notamment de moteurs diesel a injection directe
DE10338946A1 (de) * 2003-08-25 2005-03-24 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102005000618A1 (de) * 2005-01-03 2006-07-13 Robert Bosch Gmbh Brennstoffeinspritzventil

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9441590B2 (en) 2009-08-28 2016-09-13 Robert Bosch Gmbh Fuel injection valve
DE102012223064A1 (de) * 2012-12-13 2014-06-18 Continental Automotive Gmbh Vario-Düsennadel, Vario-Düsenkörper, Vario-Düsenbaugruppe sowie Vario-Kraftstoffinjektor

Also Published As

Publication number Publication date
DE102006012242A1 (de) 2007-09-20

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