WO2014090444A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
WO2014090444A1
WO2014090444A1 PCT/EP2013/071492 EP2013071492W WO2014090444A1 WO 2014090444 A1 WO2014090444 A1 WO 2014090444A1 EP 2013071492 W EP2013071492 W EP 2013071492W WO 2014090444 A1 WO2014090444 A1 WO 2014090444A1
Authority
WO
WIPO (PCT)
Prior art keywords
control valve
valve seat
fuel injection
abiaufbohrung
fuel
Prior art date
Application number
PCT/EP2013/071492
Other languages
German (de)
English (en)
Inventor
Lars Olems
Stefan Schuerg
Robert Barunovic
Ronny Leonhardt
Wolfgang Stoecklein
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
Priority to EP13779192.7A priority Critical patent/EP2932087B1/fr
Publication of WO2014090444A1 publication Critical patent/WO2014090444A1/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
    • 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
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0077—Valve seat details
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus

Definitions

  • the invention relates to a fuel injection valve, as it is preferably used for injection of fuel in combustion chambers of internal combustion engines.
  • Fuel injection valves as they are preferably used to inject fuel under high pressure into combustion chambers of internal combustion engines, are known from the prior art, for example from the published patent application DE 198 27 267 AI.
  • the fuel injection valves comprise a nozzle needle which cooperates with a nozzle seat for opening and closing at least one injection opening.
  • the nozzle needle is thereby moved directly or indirectly by the pressure in a control chamber in the longitudinal direction and thus opens and closes the injection openings, wherein the control chamber via a control valve with a low pressure space is connectable.
  • the control valve comprises an electrically controllable actuator which actuates a control valve member which opens and closes a beideboh- tion connecting the control chamber with the low-pressure chamber.
  • the prior art fuel injector has a control valve member that includes a sealing ball that cooperates with a control valve seat to open and close the drainage bore.
  • the sealing ball acts together with a conical control valve seat, so that between the control valve seat and the sealing ball a flow cross-section is opened, through which the fuel flows from the Abiaufbohrung in the low pressure chamber.
  • it is essential that the injection is very precise, ie at a precisely defined time and with the exact duration.
  • the injection is often divided into two or more partial injections, which is achieved by correspondingly fast opening and closing of the control valve.
  • the control valve To relieve the control room as quickly as possible and refill with fuel under high pressure after closing the control valve, the control valve must release the Abiaufbohrung as soon as possible and close again, which is possible the faster, the smaller the stroke, the Pass control valve member, since the length of the stroke is received directly in the switching time.
  • the forces necessary for moving the control valve member should be kept as low as possible, since the construction of, for example, a strong magnetic force requires high currents, which can be switched only relatively slowly.
  • the sealing ball has the largest possible diameter
  • the sealing line on which the control valve member, so here the sealing ball rests on the control valve seat has the largest possible diameter.
  • control valve member loading spring must be provided, which in turn must be suppressed by a very strong electromagnet or piezoelectric actuator, which requires high currents and thus high energy and has a negative effect on the switching time of the control valve.
  • the sealing line on which the control valve member is seated on the valve seat and which limits the pressurized surface of the control valve member to the outside, thus can not be chosen too large, so that an acceleration of the switching time are set narrow limits.
  • the fuel injection valve according to the invention has the advantage that the switching time compared to the known control valves is significantly reduced, without the required forces for movement of the control valve member are increased.
  • the fuel injection valve has a control valve which controls the fuel flow through a Abiaufbohrung connecting the control chamber with a low-pressure chamber, wherein the control valve comprises a movable sealing element which cooperates with a control valve seat and closes or opens a Abiaufbohrung, the seal happens along a boundary length.
  • the boundary length encloses a cross-sectional area, and the relationship is that the quotient of the square of the boundary length and the cross-sectional area is greater than 4 ⁇ ⁇ . This ratio is always met at an outlet opening of a Abiaufbohrung when the outlet is not circular. The larger the boundary length in the
  • the quotient of the sum of the squares of the boundary lengths of the respective outlet openings and the sum of the cross-sectional areas of the individual drainage boreholes must be greater than 4 ⁇ ⁇ .
  • the effect here is the same as in the provision of a non-circular outlet opening of the Abiaufbohrung, namely, that the controlled flow area is greater than when the same flow area is formed by a single circular drain opening.
  • the Control valve seat formed flat, which is easy to manufacture, even if several Abiaufbohritch are provided.
  • the sealing element which cooperates with its sealing surface with the control valve seat, is also formed flat in an advantageous manner.
  • the boundary lengths of the individual drain holes or the outlet openings are identical in this case with the outlet openings in the control valve seat and can be produced easily and inexpensively.
  • a plurality of drainage bores are provided, and their outlet openings in the control valve seat are arranged in a circle around a center.
  • the outflow of fuel from the Abiaufbohronne can be done in this case both inward and outward, so that a particularly large flow area is achieved.
  • the Abiaufbohrung or the Abiaufbohrept are advantageously designed so that they have a throttle function, which are necessary for the operation of the respective fuel injection valve.
  • a throttle function which are necessary for the operation of the respective fuel injection valve.
  • FIG. 1 shows a longitudinal section through a fuel injection valve in a schematic
  • Figure 2 is an enlargement in the region of the control valve seat of the known
  • Figure 3 shows the valve piece with associated sealing element of a first embodiment of the fuel injection valve according to the invention
  • Figure 3a shows a plan view of the valve piece
  • FIG. 3b shows a further cross section through the valve piece in the region of the control valve seat in a representation rotated by 90 degrees with respect to FIG. 3
  • FIG. 4 shows a cross section through the valve piece of a further fuel injection valve according to the invention
  • Figure 4a is a plan view of this valve piece
  • Figure 5 in the same representation as Figure 4 shows a further embodiment of the invention.
  • FIG. 1 a known from the prior art fuel injection valve is shown schematically in longitudinal section.
  • the fuel injection valve has a housing 1, which comprises a holding body 2 and a nozzle body 3, which are clamped liquid-tight against each other by a tensioning device, not shown in the drawing.
  • a pressure chamber 5 is formed, which is connected via a high-pressure line 12 to a high-pressure accumulator 13 and is always filled with fuel under high pressure during operation of the fuel injection valve.
  • the high pressure accumulator 13 is in turn supplied via a high pressure pump 14 with compressed fuel, which sucks the high pressure pump 14 from a tank 15 via a line 16.
  • a piston-shaped nozzle needle 6 is arranged longitudinally displaceable, which is guided in a guide portion 106 in the nozzle body 3.
  • the fuel flow through the pressure chamber 5 in the region of the guide section 106 is ensured by a plurality of polished sections 18 on the nozzle needle 6.
  • the nozzle needle 6 has at its combustion chamber end, a sealing surface 19, with which it cooperates with a nozzle seat 20 which has a conical shape in this embodiment and in which a plurality of injection openings 22 are formed, which are closed by the nozzle needle 8, if in Attachment to the nozzle seat 20 is. Facing away from the nozzle seat 20, the nozzle needle 6 is guided in the bore 8 of a valve piece 7, which closes the pressure chamber 5 away from the valve seat.
  • the valve member 7 is in turn fixed by an intermediate body 9 by a closing plate 4 which is screwed into the holding body 3, fixed within the housing 1.
  • the valve member 7 also separates the pressure chamber 5 from a low pressure chamber 29, in which a control valve 10 is arranged and which is connected via a drain line 37 to the fuel tank 15 and thereby always maintained at low pressure.
  • a control chamber 25 is limited, which is connected via an inlet bore 27 which is formed in the valve member 7 with the pressure chamber 5.
  • a drain bore 28 is also provided, which connects the control chamber 25 with the low-pressure chamber 29.
  • the Abiaufbohrung 28 in this case has an outlet throttle 128 which is formed within the Abiaufbohrung 28, so that the fuel flow is only throttled by the Abiillerbohrung.
  • the Abiaufbohrung 28 opens into a control valve seat 33 which is formed on the valve piece 7 and has a conical shape, and there forms an outlet opening 228, as shown in more detail in Figure 2.
  • the control valve 29 which includes a magnet armature 30 to which a sealing ball 32 is fixed, which cooperates with the conical control valve seat 33.
  • the armature 30 is acted upon by a spring 35 in the direction of the control valve seat 33 with a closing force and can be moved by means of an electromagnet 31 against the force of the spring 35, so that the sealing ball 32, the outlet opening 228 of Abiillerbohrung 28 releases. Since the Abiaufbohrung 28 is rotationally symmetrical, the outlet opening 228 forms a circle on which the sealing ball 32 sealingly abuts when it is in the closed position in contact with the control valve seat 33.
  • the control valve 10 is closed, so that in the control chamber 25, the same high fuel pressure prevails as in the pressure chamber 5, which presses the nozzle needle 6 against the nozzle seat 20 and thus closes the injection openings 22. If an injection takes place, then the electromagnet 31 is energized and attracts the armature 30 against the force of the spring 35. The sealing ball 32 thereby lifts off from the control valve seat 33 and releases the outlet opening 228 of the drainage bore 28.
  • the outflowing fuel from the control chamber 25 can drop the fuel pressure in the control chamber 25, although constantly fuel flows through the inlet bore 27, but this inflow is less than that
  • FIG. 3 shows the valve piece 7 of a fuel injection valve according to the invention, in which only the valve piece 7 and the sealing element 40 cooperating with the control valve seat 33 formed thereon have been changed with respect to the fuel injection valve shown in FIG.
  • the valve piece 7 is here constructed in two parts and, in addition to the actual valve piece 7, which receives the nozzle needle 6, still a valve section 7 ', in which the outlet throttle 128 is formed here.
  • the control valve seat 33 is formed in contrast to the embodiment shown in Figure 1 as a flat seat in which the outlet opening 228 of the Abiaufbohrung 28 is arranged centrally.
  • a sealing element is provided here for cooperation with the control valve seat 33, which has a hemispherical shape, wherein the flat side of the hemisphere faces the control valve seat 33.
  • the outlet opening 228 of the drainage bore 28 is rectangular in this embodiment, as shown in Figure 3a in a plan view of the valve section 7 '.
  • the rectangular outlet opening 228 has a length a and a width b, because the rectangular outlet opening 228 is completely covered by the sealing element 40 in the closed position of the control valve and thereby sealed. Since both the control valve seat 33 and the sealing element 40 are formed flat, the outlet opening 228 is sealed exactly along the contour of this rectangle, so that the boundary length U of the outlet opening 228 twice (a
  • the portion of the Abiaufbohrung 28 is shown in cross-section, which is formed in the valve section 7 ', wherein the representation is rotated relative to that in Figure 3 by 90 degrees.
  • the Abiaufbohrung shows in this illustration a funnel shape, which forms the transition from the cylindrical Abiaufbohrung 28 within the valve piece 7 to the rectangular outlet opening 228 on the control valve seat 33.
  • the valve piece 7 is divided depends on the shape of the Abiaufbohrung 28 and the available manufacturing process. It can also be provided that the valve member 7 shown here and the valve section 7 'are integrally formed.
  • the outflow of the fuel within the Abiaufbohrung 28 is turbulent in a fuel injection valve, that is, the influence of the surface of Abiaufbohrung 28 for a given cross-sectional area is of minor importance.
  • the fuel flows through the Abiaufbohrung 28 thus about the same resistance that a circular Abiaufbohrung with the same
  • FIG. 4 shows a further embodiment of the fuel injection valve according to the invention is shown, in which case only the valve section 7 'is shown in cross section. Instead of a single Abiaufbohrung here a plurality of Abiaufbohrept 28 'is provided, which open into the control valve seat 33.
  • Figure 4a shows in a plan view of the valve section 7 ', the Abiaufbohrept 28' and the outlet openings 228 'are arranged in a circle around the center of the valve section 7'.
  • Each of these outlet openings 228 'analogous to the embodiment of Figure 3 has a boundary length U and a
  • the Abiaufbohritch 28 'of the embodiment of Figure 4 can also be designed so that they take over the necessary function of the fuel injector throttle function, that is, a separate outlet throttle, as shown for example in Figure 3, can be omitted.
  • FIG. 5 shows a further exemplary embodiment, wherein this exemplary embodiment differs from that in FIG. 3 only in that an annular groove 44 is provided in the control valve seat 33.
  • This annular groove 44 limits the effective control valve seat on which the sealing element 40 is seated, which improves the sealing function.
  • the outflowing fuel which is indicated by arrows, can be set in turbulence and thereby braked, so that a throttling function is provided by the annular groove 44, which can replace the function of the outlet throttle, so that a separate outlet throttle within the Abiaufbohrung 28 is not necessary ,
  • the annular groove 44 can also be fluidically connected to the low-pressure side, that is, to the low-pressure space 29, for example, by a radial direction This prevents the control valve seat 33 is undermined by the inevitable wear with pressure and the acted upon by high pressure from the Abiaufbohrung 28 surface of the sealing element 40 too strong elevated.
  • the hydraulic opening force on the sealing element 40 or the armature 30 can thus always be kept below a limit, for example, below the spring force with which the magnet armature 30 is pressed by the spring 35 against the control valve seat 33. This ensures the tightness of the control valve 29 over the entire life.
  • control valve seat 33 is not flat, but for example, has a slight conical shape, which cooperates with a corresponding conical sealing element. This allows a centering function of the sealing element with respect to the control valve seat 33, so that a part of the guide function for the armature 30 is thereby adopted.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne une soupape d'injection de carburant comprenant une soupape de commande (10) commandant l'écoulement du carburant par un alésage d'évacuation (28) à travers lequel le carburant est dirigé hors d'une chambre de commande (10) vers une chambre basse pression (29), ledit alésage d'évacuation (28) débouchant dans un siège de soupape de commande (33) où il forme un orifice de sortie (228). La soupape de commande (10) comprend un élément d'étanchéité mobile (40) qui coopère avec le siège de soupape de commande (33 ; 33') et ferme l'orifice de sortie (228) de l'alésage d'évacuation (28) lorsqu'il est en appui sur le siège de soupape de commande (33 ; 33'). L'élément d'étanchéité (40) isole l'alésage d'évacuation (28) de la chambre basse pression (29) sur une longueur de bordure (U) lorsque la soupape de commande (10) est fermée, et la longueur de bordure (U) définit une surface de section transversale (A) le quotient du carré de la longueur de bordure (U²) par la surface de section transversale (A) étant supérieur à 4n. Dans une variante, il peut y avoir plusieurs alésages d'évacuation, auquel cas le quotient de la somme des carrés des longueurs de bordure (U²) par la somme des surfaces de section transversale (A) des différents alésages d'évacuation (28') est supérieur à 4n.
PCT/EP2013/071492 2012-12-14 2013-10-15 Soupape d'injection de carburant WO2014090444A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13779192.7A EP2932087B1 (fr) 2012-12-14 2013-10-15 Soupape d'injection de carburant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012223259.1 2012-12-14
DE201210223259 DE102012223259A1 (de) 2012-12-14 2012-12-14 Kraftstoffeinspritzventil

Publications (1)

Publication Number Publication Date
WO2014090444A1 true WO2014090444A1 (fr) 2014-06-19

Family

ID=49385247

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2013/071492 WO2014090444A1 (fr) 2012-12-14 2013-10-15 Soupape d'injection de carburant

Country Status (3)

Country Link
EP (1) EP2932087B1 (fr)
DE (1) DE102012223259A1 (fr)
WO (1) WO2014090444A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6677194B2 (ja) * 2017-03-03 2020-04-08 株式会社デンソー 燃料噴射弁

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19827267A1 (de) * 1998-06-18 1999-12-23 Bosch Gmbh Robert Kraftstoff-Einspritzventil für Hochdruck-Einspritzung mit verbesserter Steuerung der Kraftstoffzufuhr
EP2019198A2 (fr) * 2007-07-24 2009-01-28 Robert Bosch GmbH Injecteur
DE102007038138A1 (de) * 2007-08-13 2009-02-19 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19827267A1 (de) * 1998-06-18 1999-12-23 Bosch Gmbh Robert Kraftstoff-Einspritzventil für Hochdruck-Einspritzung mit verbesserter Steuerung der Kraftstoffzufuhr
EP2019198A2 (fr) * 2007-07-24 2009-01-28 Robert Bosch GmbH Injecteur
DE102007038138A1 (de) * 2007-08-13 2009-02-19 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor

Also Published As

Publication number Publication date
DE102012223259A1 (de) 2014-06-18
EP2932087A1 (fr) 2015-10-21
EP2932087B1 (fr) 2017-03-01

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