WO2007147667A1 - Dispositif d'injection de carburant pour moteur à combustion interne - Google Patents

Dispositif d'injection de carburant pour moteur à combustion interne Download PDF

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Publication number
WO2007147667A1
WO2007147667A1 PCT/EP2007/054146 EP2007054146W WO2007147667A1 WO 2007147667 A1 WO2007147667 A1 WO 2007147667A1 EP 2007054146 W EP2007054146 W EP 2007054146W WO 2007147667 A1 WO2007147667 A1 WO 2007147667A1
Authority
WO
WIPO (PCT)
Prior art keywords
control valve
valve element
injection device
fuel injection
chamber
Prior art date
Application number
PCT/EP2007/054146
Other languages
German (de)
English (en)
Inventor
Hans-Christoph Magel
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 EP07728601A priority Critical patent/EP2035685A1/fr
Publication of WO2007147667A1 publication Critical patent/WO2007147667A1/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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing 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
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • F02M63/0042—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing combined with valve seats of the lift 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0043—Two-way valves

Definitions

  • the invention relates to a fuel injection device for an internal combustion engine according to the preamble of claim 1.
  • the present invention has the object to provide a fuel injection device of the type mentioned, with the very short multiple injections are possible. At the same time, the fuel injection device should be inexpensive and compact.
  • valve piece facilitates in manufacture the introduction of the control chamber and / or the control valve chamber and the corresponding guides for the
  • Control valve member As a result, the production costs are reduced. Since the injection valve element is received in a generally associated with the high-pressure port receiving space, a pressure stage on the injection valve element is not required, as was previously provided for generating a hydraulic force acting in the opening direction. By being able to dispense with such a pressure level, an otherwise existing leakage line can be omitted, which dissipates the inevitably occurring at such a pressure level leakage fluid. Thus, the structure of the fuel injection device is again significantly simplified.
  • a particularly advantageous embodiment of the fuel injection device according to the invention is characterized in that the valve member in the region of the guide of the control valve element radially outside at least partially, for example, in an extension-like portion, is surrounded by an annular space which is constantly connected to the high pressure port.
  • the valve member in the region of the guide of the control valve element radially outside at least partially, for example, in an extension-like portion is surrounded by an annular space which is constantly connected to the high pressure port.
  • valve piece can also take over the guidance of an end region of the injection valve element. Since the valve piece is a separate part, and the guide for the injection valve element can be introduced with high precision and cost.
  • valve piece is in one piece.
  • the manufacturing is simplified if the valve piece is multi-piece with a first part valve piece and a second part valve piece, as this accessibility to the control valve chamber and the hydraulic control chamber and the control valve seat is improved.
  • an additional seal or a sealing edge may be provided for sealing the one part of the valve piece with respect to the other part valve piece.
  • the two part valve pieces can be centered to each other by means of a centering device or by means of a centering.
  • a pressure-balanced control valve element allows significantly smaller forces to be applied, for example, by an electromagnetic actuator which is connected to the control valve element.
  • pressure-balanced means in the present case that at least in the closed state of the control valve, preferably also in the open state, the control valve element no or at least no significant hydraulic forces act.
  • the strokes of such a pressure-balanced control valve element to be executed for influencing the pressure in the hydraulic control chamber are also comparatively small. Since smaller forces are to be applied for the movement of the control valve element, the corresponding actuator can build smaller, whereby the total mass, which is to be moved, lower and the damping behavior is improved.
  • a simple and inexpensive to build realization of a pressure-balanced control valve element comprises a valve piston with an at least substantially radially outer sealing edge. It is particularly advantageous if a control valve seat is designed as a flat seat. This can also be made simple and inexpensive and tolerates certain misalignments of the control valve element. In principle, however, other embodiments of the control valve seat are conceivable, for example, a ball seat or a conical seat.
  • connection channel for example, a return
  • Control valve arranged in the control valve element. This simplifies the structural design of the fuel injection device.
  • control valve comprises a control valve chamber which is connected via an outflow throttle to the hydraulic control chamber and via an inflow throttle at least indirectly with a high-pressure port, and which is connected to a low-pressure port when the control valve is open.
  • a filling of the control valve chamber is also possible via the outflow throttle when closing the control valve, which increases the closing speed of the control valve element.
  • the injection valve element has at least one control-chamber-side and one valve-seat-side section which are coupled to one another such that a bending moment is not transferred from one section to the other section or at least only reduced.
  • transverse forces on the guide and / or the valve seat of the injection valve element are reduced or completely prevented, whereby the service life is prolonged and the free movement of the injection valve element is improved.
  • the required manufacturing accuracy can be reduced in this way, because tensions of the injection valve element due to manufacturing inaccuracies are reduced or avoided altogether.
  • a manufacturing technology particularly simple realization of such a bending moment decoupling consists in a material weakening, which has a cardanic character.
  • the two sections may also be hydraulically coupled to one another.
  • FIG. 1 shows a partial section through a first embodiment of a fuel
  • FIG 3 shows a partial section through a third embodiment of a fuel injection device.
  • a fuel injection device bears the reference numeral 10 as a whole. It is used for injecting fuel directly into an associated but not shown fuel
  • the fuel injection device 10 has a high pressure port 12 which is connected to a pressure accumulator 14 ("rail"), is stored in the fuel under high pressure.
  • the fuel injection device 10 comprises a housing 16 having a main portion 18 and a nozzle body 20.
  • the housing 16 is penetrated almost over its entire length by a recess 22, in which among other things an injection valve element 24, which due to its very elongated shape as well "Nozzle needle” is called, is included.
  • a sealing edge 26 which cooperates with a housing-side injection valve seat 28, is present on the injection valve element 24.
  • fuel is discharged into the combustion chamber from the fuel injection device 10 via fuel outlet channels 30 or such discharge is prevented.
  • an annular high-pressure space 32 is formed, which is constantly in communication with the high-pressure connection 12.
  • the injection valve element 24 thus "floats" during operation of the fuel injection device 10 in the high pressure chamber 32 in the high pressure fuel.
  • the upper end of the injection valve element 24 in FIG. 1 is fluid-tight, but in sliding fit, guided in a valve piece 34, which closes off the high-pressure chamber 32 at the top.
  • the upper end face of the injection valve element 24 in FIG. 1 forms a hydraulic control surface 36 which, together with a recess (without reference numeral) in the valve piece 34, delimits a hydraulic control chamber 38.
  • a valve spring 40 is clamped, which urges the injection valve element 24 in the closing direction against the injection valve seat 28.
  • two lateral incisions 42a and 42b are present in the injection valve element 24 at a first axial position, between which only a comparatively thin material web 44 has remained. Axially spaced therefrom, there are two further lateral cuts in the injection valve element 24, which are arranged rotated by 90 ° relative to the lateral cuts 42a and 42b, so that only the lateral cut 46a and the corresponding material web 48 are visible in FIG.
  • the lateral incisions 42a and 42b and 46a (and the invisible lateral incision 46b) form a material weakening 50 in this respect, which has a cardanic character, by a bending moment of the located above the material weakening 50 portion of the Injection valve element 24 is transferred to the located below this material weakening 50 section only reduced.
  • a similar material weakening 52 is also located on the injection valve element 24 approximately at the level of the transition between the main portion 18 and the nozzle body 20 of the housing 16.
  • the injection valve element 24 is formed in two parts with a control chamber side portion 54 and a valve seat side portion 56.
  • the two sections 54 and 56 are coupled by a hydraulic Kopp ler 58 with each other, but could also be mechanically coupled be.
  • the injection valve element 24 is integrally formed, so that can be dispensed with a hydraulic coupler.
  • the valve seat side portion 56 of the injection valve member 24 is guided in the nozzle body 20, wherein the continuity of the high-pressure chamber 32 is ensured to the fuel discharge channels 30 by flats 60 on the valve seat side portion 56.
  • the valve seat-side section 56 moreover has a conical hydraulic pressure surface 62 acting in the opening direction of the injection valve element 24.
  • the pressure in the hydraulic control chamber 38 is influenced by the position of an electromagnetic control valve 64.
  • the latter has a control valve element designed as a valve piston 66, which is guided in the valve piece 34.
  • an armature 68 is attached to the control valve element 66, wherein in an exemplary embodiment, not shown, the control valve and the armature can also be made in one piece.
  • the armature 68 cooperates with an electromagnetic coil 70.
  • the control valve element 66 is acted upon by a valve spring 72 in its closed position. In this, it lies with its in Figure 1 lower end with a circumferential and substantially radially outer sealing edge 74 on a formed in the valve member 34 as a flat seat control valve seat 76.
  • control valve seat 76 is arranged in a control valve chamber 78, which communicates via an inflow throttle 80 with the high-pressure chamber 32. Also the hydraulic
  • Control chamber 38 is connected via such a flow restrictor 82 with the high-pressure chamber 32 in constant communication.
  • Radially outside of the control valve seat 76 opens into the control valve chamber 78, a connection (without reference numeral) from the hydraulic control chamber 38 ago, in a Outflow throttle 84 is arranged.
  • the control valve element 66 is penetrated in its longitudinal direction by a connection channel 86 which opens on the upper side of the control valve element 66 into an armature space 88, which in turn is connected to a low-pressure connection 90.
  • the fuel injector 10 operates as follows:
  • the coil 70 is energized, so that the control valve member 66 lifts with its sealing edge 74 from the control valve seat 76.
  • fuel can flow from the hydraulic control chamber 38 via the outflow throttle 84, the control valve chamber 78 and the connecting channel 86 to the low pressure port 90.
  • the pressure in the high-pressure chamber 32 drops, and when the forces acting in the closing direction are below the force acting in the opening direction on the pressure surface 62, the sealing edge 26 of the injection valve element 24 lifts off from the injection valve seat 28.
  • fuel can be discharged from the high-pressure chamber 32 via the fuel outlet channels 30 into the combustion chamber.
  • the energization of the coil 70 is terminated, whereby the control valve member 66 is pressed by the valve spring 72 with the sealing edge 74 against the control valve seat 76 again.
  • the connection of the control valve chamber 78 with the low pressure port 90 is thus interrupted.
  • the pressure in the control valve chamber 78 increases via the inflow throttle 80, and as a result and also because of the inflow throttle 82, the pressure in the hydraulic control chamber 38.
  • the injection valve element 24 closes. It can be seen from FIG.
  • valve piece 34 is surrounded by the annular high-pressure chamber 32, in particular in the region of the control chamber 38, the control valve chamber 78 and the guide of the control valve element 66 and the injection valve element 24.
  • a widening of the guides of the injection valve element 24 and the control valve element 66 in the valve piece 34 by the high pressure is therefore reduced, and thus the leakage is reduced in this area.
  • the strength load of the valve piece 34 is reduced by this configuration. It can also be seen that virtually no hydraulic forces acting in its opening or closing direction act on the control valve element 66 in the closed state. So this is "pressure balanced". For a simple, inexpensive and compact design of the control valve 64 and thus also the fuel injection device 10 is possible.
  • connection channel 86 in the control valve element 66 also prevents or at least reduces the influence of the movement of the armature 68 by the flow of the fuel from the control valve chamber 78 to the low-pressure connection 90.
  • the control valve 66 and the armature 68 can be dimensioned very small, whereby small moving masses are achieved. This allows the realization of fast valve switching times and reduces bouncing when hitting the control valve element 66 on the control valve seat 76. It can also be seen from Figure 1 that a leakage line due to the arrangement of the injection valve element 24 as in the high-pressure chamber "floating" valve element is not required.
  • the size of the high pressure chamber 32 also causes it to have an accumulator function.
  • FIG. 2 A further embodiment is shown in FIG. 2.
  • elements and regions which have equivalent functions to previously described elements and regions bear the same reference numerals and are not explained again in detail.
  • the fuel injection device 10 of Figure 2 differs from that shown in Figure 1, especially in its lower portion: This corresponds to the currently known from the market fuel injectors 10, in which the injection valve element 24 is not in the high pressure "floats ". Instead, there is a low pressure in an annular space 92 present above the nozzle body 20. Also a hydraulic coupler is not available. From the high-pressure chamber 32, which is present in the fuel injection device 10 shown in Figure 2 only in the region of the pressure surface 62 and is connected via a channel 93 to the high pressure port 12, the low pressure chamber 92 passing leakage fluid (the flats 60 are in this area at the injection valve element 24 not present) is discharged from a leakage line 94.
  • FIG. 1 corresponds in the lower part to that of FIG. 1.
  • the valve piece 34 is differently configured, which unlike in FIGS. 1 and 2 is not formed in one piece but in two pieces with a first part valve piece 96 and a second part valve piece 98.
  • the first PartVentil congress 96 is acted upon by the valve spring 90 against the second PartVentil rave 98.
  • the control valve seat 76 is formed on the outside of the first PartVentil culturess 96, which serves to guide the injection valve member 24 and for receiving the hydraulic control chamber 38 and has no direct connection to the low pressure port 90.
  • the control valve chamber 78 is present in the second part valve piece 98.
  • Valve piece 34 its manufacture can be simplified.
  • a sealing edge (not shown) and / or additionally an outer seal 100 may be provided between the two partial valve pieces 96 and 98.
  • the two partial valve pieces 96 and 98 can also be centered relative to one another via centering means, so that the control valve element 66 and the injection valve element 24 are arranged coaxially as exactly as possible.

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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 un dispositif d'injection de carburant (10) destiné à un moteur à combustion interne. Ce dispositif comprend au moins un élément d'injecteur (24) qui délimite d'un côté une chambre de commande hydraulique (38) et qui peut de l'autre côté dégager ou bloquer des canaux de sortie de carburant (30). Ledit dispositif comprend par ailleurs une soupape de commande (64) destinée à influer sur la pression régnant dans la chambre de commande hydraulique (38). Selon l'invention, un élément de soupape de commande (66) de la soupape de commande (64) est au moins sensiblement compensé en pression.
PCT/EP2007/054146 2006-06-23 2007-04-27 Dispositif d'injection de carburant pour moteur à combustion interne WO2007147667A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07728601A EP2035685A1 (fr) 2006-06-23 2007-04-27 Dispositif d'injection de carburant pour moteur à combustion interne

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610028918 DE102006028918A1 (de) 2006-06-23 2006-06-23 Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine
DE102006028918.8 2006-06-23

Publications (1)

Publication Number Publication Date
WO2007147667A1 true WO2007147667A1 (fr) 2007-12-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/054146 WO2007147667A1 (fr) 2006-06-23 2007-04-27 Dispositif d'injection de carburant pour moteur à combustion interne

Country Status (3)

Country Link
EP (1) EP2035685A1 (fr)
DE (1) DE102006028918A1 (fr)
WO (1) WO2007147667A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009132879A2 (fr) * 2008-04-28 2009-11-05 Robert Bosch Gmbh Dispositif d'injection de carburant

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002052144A1 (fr) * 2000-12-27 2002-07-04 Robert Bosch Gmbh Soupape de commande a forces equilibrees montee sur la chambre de commande d'un injecteur de carburant
DE10120157A1 (de) * 2001-04-25 2002-11-07 Bosch Gmbh Robert Kraftstoffinjektor mit Steuerventil-integriertem Drosselelement
EP1319827A2 (fr) * 2001-12-12 2003-06-18 Robert Bosch Gmbh Electrovanne pour commander une soupape d'injection d'un moteur à combustion interne
WO2007068526A1 (fr) * 2005-12-13 2007-06-21 Robert Bosch Gmbh Injecteur de carburant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002052144A1 (fr) * 2000-12-27 2002-07-04 Robert Bosch Gmbh Soupape de commande a forces equilibrees montee sur la chambre de commande d'un injecteur de carburant
DE10120157A1 (de) * 2001-04-25 2002-11-07 Bosch Gmbh Robert Kraftstoffinjektor mit Steuerventil-integriertem Drosselelement
EP1319827A2 (fr) * 2001-12-12 2003-06-18 Robert Bosch Gmbh Electrovanne pour commander une soupape d'injection d'un moteur à combustion interne
WO2007068526A1 (fr) * 2005-12-13 2007-06-21 Robert Bosch Gmbh Injecteur de carburant

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009132879A2 (fr) * 2008-04-28 2009-11-05 Robert Bosch Gmbh Dispositif d'injection de carburant
WO2009132879A3 (fr) * 2008-04-28 2010-01-14 Robert Bosch Gmbh Dispositif d'injection de carburant

Also Published As

Publication number Publication date
DE102006028918A1 (de) 2007-12-27
EP2035685A1 (fr) 2009-03-18

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