EP2458194A2 - Soupape d'injection de carburant pour moteurs à combustion interne - Google Patents

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

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Publication number
EP2458194A2
EP2458194A2 EP11182517A EP11182517A EP2458194A2 EP 2458194 A2 EP2458194 A2 EP 2458194A2 EP 11182517 A EP11182517 A EP 11182517A EP 11182517 A EP11182517 A EP 11182517A EP 2458194 A2 EP2458194 A2 EP 2458194A2
Authority
EP
European Patent Office
Prior art keywords
valve needle
valve
needle part
contact surface
fuel injection
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
EP11182517A
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German (de)
English (en)
Other versions
EP2458194B1 (fr
EP2458194A3 (fr
Inventor
Andreas Rau
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 EP2458194A2 publication Critical patent/EP2458194A2/fr
Publication of EP2458194A3 publication Critical patent/EP2458194A3/fr
Application granted granted Critical
Publication of EP2458194B1 publication Critical patent/EP2458194B1/fr
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
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • 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
    • 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
    • F02M61/167—Means for compensating clearance or thermal expansion
    • 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
    • F02M2200/02—Fuel-injection apparatus having means for reducing wear
    • 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
    • F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering
    • 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
    • F02M2547/001—Control chambers formed by movable sleeves

Definitions

  • the invention relates to a fuel injection valve for internal combustion engines as used for example for the direct injection of fuel directly into the combustion chamber of high-speed, self-igniting internal combustion engines.
  • the present invention is based on a fuel injection valve, as for example from DE 10 2004 061 800 A1 is known.
  • the prior art known from this document is - also to illustrate the problem occurring - on the basis of FIGS. 1 . 2a-2c and 3a, 3b explained in more detail.
  • the well-known fuel injection valve after FIG. 1 has a housing 1, which comprises a holding body 2, an intermediate disc 3, an orifice plate 4 and a valve body 5.
  • a leakage oil space 13 is formed, in which a piezoelectric actuator 10 is arranged, which actuates a control valve member 16 via a hydraulic coupler 12, which is arranged within the intermediate disc 3.
  • the control valve member 16 is movable in the longitudinal direction, whereby the control valve chamber 17, in which the control valve member 16 is connected by the movement of the control valve member 16 with the leakage oil chamber 13 ,
  • the intended for injection and high pressure fuel is usually provided by a not shown in the drawing, but well-known from the prior art rail, which is filled via a high pressure pump with fuel at high pressure.
  • This fuel is introduced into a high-pressure bore 18 formed in the holding body 1, which extends through the intermediate disk 3 and a high-pressure passage 32 formed in the throttle disk 4 into the valve body 5.
  • a pressure chamber 19 is formed, in which a valve needle 20 is arranged longitudinally displaceable, wherein the valve needle 20 has a substantially piston shape and is guided in a guide portion 27 within the pressure chamber 19.
  • the valve needle 20 has at its end remote from the control valve 15 a valve sealing surface 23, with which it cooperates with a formed at the combustion chamber end of the pressure chamber 19 valve seat 23 and so injection openings 25 opens or closes, so that depending on the position of the valve needle 20 fuel from the Pressure chamber 19 is injected through the injection port 25.
  • the valve needle 20 has at its end facing away from the valve seat 23 an end face 21 and is guided at this end in a sleeve 29. Between the sleeve 29 and a valve needle 20 formed on the shoulder 24, a closing spring 28 is arranged under pressure bias, via which the sleeve 29 is pressed on the one hand against the throttle plate 4 and on the other hand, the valve needle 20 against the valve seat 23rd
  • a control chamber 30 is limited, is provided in the fuel under varying pressure to exert a closing force in the direction of the valve seat 23 on the valve needle 20.
  • an inlet throttle 34 is formed in the throttle plate 4, which forms a connection between the high-pressure bore 18 and the control chamber 30.
  • an outlet throttle 35 is provided in the throttle plate 4, which connects the control chamber 30 with the control valve chamber 17.
  • control valve 15 If the control valve 15 is opened, then fuel is relieved from the control chamber 30 via the outlet throttle 35 into the control valve chamber 17 and from there further into the leakage oil space 13, so that the pressure in the control chamber 30 drops.
  • the inlet throttle 34 is matched to the outlet throttle 35, that with the control valve 15 open, more fuel flows via the outlet throttle 35 than can flow through the inlet throttle 34 in the same period.
  • the control valve 15 When the control valve 15 is closed, a high fuel pressure in the control chamber 30 builds up again via the inlet throttle 34, which exerts a closing force on the end face 21 of the valve needle 20 and presses it against the valve seat 23, so that the injection openings 25 are closed.
  • the injector should have a good minimum quantity capability, that is to say that the minimum time duration that the injector can be opened for injection should be as short as possible. This is necessary above all for pre-injections or post-injections, which are upstream or downstream of the actual main injection. These injection quantities are very small, sometimes only 1 or 2 mm 3 , which can only be achieved with the correspondingly high injection pressures of up to 2000 bar with an extremely short opening time of the injector.
  • the injector should be as robust as possible against changes and wear.
  • the opening of the valve needle happens after pressure drops in the control room - as described above - ultimately the fact that an opening force on the shoulder 24 and on parts of the valve sealing surface 22 is exerted by the pressure in the pressure chamber 19.
  • the size of this opening force thus depends on which parts of the surface of the valve needle from the fuel pressure in the pressure chamber 19 are acted upon and exert a directed away from the valve seat force component on the valve needle. Wear processes may cause the partial area of the valve sealing surface 22 acted upon by the fuel pressure to increase or decrease over the course of the service life, so that the opening force changes correspondingly at the same pressure 19.
  • FIG. 2a the voltage curve U for controlling the in FIG. 1 shown piezoelectric actuator 10 during an injection, wherein the representation, as well as the representation in the FIGS. 2b and 2c , only to be understood schematically.
  • the voltage U is raised, so that the piezoelectric actuator 10 expands.
  • a Magnetaktors instead of the piezoelectric actuator, a corresponding magnetic field is generated by the building up current, which attracts a magnet armature and thus leads to actuation of the control valve.
  • By opening the control valve 15 and the preparation of the connection between the control valve chamber 17 and the leakage oil chamber 13 drops at a slightly later time t 1 of the pressure p in the control chamber 30, which in FIG.
  • valve needle stroke is h in Figure 2c shown.
  • the valve needle 20 remains in its end position as long as the actuator is actuated by the control voltage. If the control voltage is reduced back to 0, closes the control valve 15 and the pressure in the control chamber 30 builds up again accordingly, whereby the valve needle 20 is pushed back into its end position, which in Figure 2c happens at time t 3 .
  • the valve needle moves in contrast to the illustration in FIG Figure 2c not in an end position, but reverses its movement before reaching it. Qualitatively, however, the above applies.
  • the pressure in the control room increases again to the initial value and reached at the time t e the opening pressure p oe , so that the valve needle 20 closes.
  • the opening duration of the valve needle is thus time difference between t e and t 3 , which is thus smaller than the actual actuation time of the actuator. This makes it possible to realize very short opening times of the injection valve and thus very low injection quantities.
  • the slow pressure reduction in the control chamber 30 is associated with a relatively high sensitivity to a change in the opening pressure p oe .
  • the opening pressure p oe changes, for example, as a result of wear on the valve needle, which results in FIG. 3a is illustrated by the pressure difference ⁇ p oe , so also the time t 3 , to which the injection valve opens, which is indicated on the abscissa by At.
  • the slower the pressure drop in the control chamber the more the opening time t 3 changes, which shortens or lengthens the opening time of the injection valve and thus changes the injection quantity, which impairs the optimum operation of the engine.
  • the minute quantity capability and the insensitivity to change of the opening pressure can not be simultaneously optimized.
  • the fuel injection valve according to the invention with the characterizing features of claim 1 allows a simultaneous optimization of Kleinstmengenpar and robustness, so insensitivity to a change in the opening pressure.
  • the valve needle is divided into two piston-shaped valve needle parts, wherein the first valve needle part delimits the control chamber and the second valve needle part, the valve sealing surface, with the it interacts with the valve seat 23.
  • both valve needle parts cooperate in such a way that the first valve needle part can execute an idle stroke in the longitudinal direction, without thereby moving the second valve needle part.
  • a driver is provided in which the first valve needle part entrains the second valve needle part during its opening stroke movement after an idle stroke, which only lifts off from the valve seat 23 and thus releases the injection openings. This results in a delay between the pressure drop in the control chamber 30 and the beginning of the injection, without the robustness to a change in the injection pressure is impaired. Also, the closing behavior of the injector is not adversely affected by this change.
  • first valve needle part and the second valve needle part are arranged coaxially with one another.
  • the axial force can be transmitted without offset, so that the wear minimized and tilting of the valve needle parts is prevented.
  • both the first valve needle part and the second valve needle part contact surfaces which abut each other in the movement in the opening or closing direction. In this way, in each case a force transmission of the two valve needle parts allows each other and ensures the function of the injection valve.
  • a nub-shaped Anformung is formed on one of the valve needle parts, which is arranged in a corresponding receptacle of the respective other valve needle part, thereby forming a driver, which allows the above-described idle stroke of the first valve needle part.
  • a slot can be formed in addition to the previously described gripping hook in a valve needle part, in which a pin connected to the other valve needle part engages, thereby forming a driver, which allows the idle stroke of the first valve needle.
  • FIG. 4 a first embodiment of a fuel injection valve according to the invention is shown.
  • the representation corresponds, except for the changed valve needle 20, exactly the representation in FIG. 1 so that a description of the same components is omitted.
  • the valve needle 20 is arranged, which is divided here into a first valve needle part 120 and a second valve needle part 220.
  • a first gripping hook 64 is formed, which engages in a second gripping hook 65 which is formed on the second valve needle part 220.
  • the gripping hooks 64, 65 are formed so that in the closed position of the valve needle 20, the gripping hooks 64, 65 abut each other at first contact surfaces 51, 61 and at a stroke of the first valve needle member 120 in the direction of the control chamber 30, the gripping hooks 64, 65 only after passing a Leerhubs with second contact surfaces 52, 62 abut one another positively, whereby the second valve needle member 220 is moved in the opening direction.
  • a high pressure in the control chamber 30 is present, which presses the first valve needle part 120 in the direction of the valve seat 23, such that the gripping hooks 64, 65 abut each other and thereby a closing force on the second valve needle part 220 is effected.
  • the first valve needle part 120 bears with its first contact surface 51, which is opposite to the end face 21, against the first contact surface 61 of the second valve needle part 220 and thus presses the second valve needle part 220 into its closed position.
  • On parts of the gripping hook 64 acts in the opening direction acting hydraulic force on the first valve needle part 120, so that by lowering the pressure in the control chamber 30 - as described above - an opening force on the first valve needle part 120 is effected.
  • the first contact surface 51 of the first valve needle part 120 and the first contact surface 61 of the second valve needle part move away 220 of each other, until the second contact surface 52 of the first valve needle part 120 abuts against the second contact surface 62 of the second valve needle part 220.
  • the stroke that the first valve needle part 120 passes through up to this point in time is the idle stroke h 1 already mentioned above.
  • the first valve needle part 120 takes the second valve needle part 220 in its movement, on the one hand due to the hydraulic forces, on the other hand due to the kinetic energy that has already taken up the first valve needle part 120 by this time.
  • the second valve needle part 220 thereby lifts off from the valve seat 23, which causes an additional opening force by the hydraulic force on the valve sealing surface 23 in the opening direction.
  • the injection valve is again closed by increasing the pressure in the control chamber 30, as a result of which the first valve needle part 120 and the second valve needle part 220 are pressed back into their respective closed position.
  • FIG. 5 shows a further driver 40 according to the invention, in which case only the driver itself, ie only the respective ends of the first valve needle part 120 and the second valve needle part 220 is shown.
  • a Anformung 48 is formed, which has a T-shape in cross section.
  • the first valve needle part 120 has a corresponding receptacle 50, which is formed so that the Anformung 48 is received therein and behind the shoulder formed by the cross-sectionally T-shaped Anformung.
  • FIG. 6 The functionality is in FIG. 6 shown in more detail.
  • the Anformung 48 has at its the first valve needle part 120 facing the end of the first contact surface 61 which bears against the formed on the bottom of the receptacle 50 first contact surface 51 of the first valve needle part 120.
  • the formed by the Hintergreifung of the receptacle 50 second contact surface 62 has in this position an axial distance from the opposite contact surface 52 of the Anformung 48.
  • the position during the opening movement of the valve needle 20 is shown.
  • FIG. 7b shows two further embodiments of the coupler according to the invention, wherein an embodiment on the left side in the FIG. 7b labeled A and the second embodiment on the right side is labeled B.
  • Figure 7a shows the embodiment A in a opposite FIG. 7b rotated 90 ° side view corresponding to the dash-dot line in FIG. 7b
  • FIG. 7c the corresponding side view of the embodiment B shows.
  • a molding 48 is formed in the second valve needle part 220, wherein in the Anformung 48 - with reference to the embodiment A - a slot 42 is introduced.
  • a corresponding receptacle 50 is formed, which surrounds the Anformung 48 and in which a bore 45 is formed.
  • a pin 43 is arranged materially or non-positively, the length of which corresponds to the diameter of the first valve needle part 120. Since the pin 43 is disposed in the bore 45 without play, it always moves synchronously with the first valve needle part 120. This is in the representation of Figure 7a again clearly.
  • the first valve needle part 120 With the first contact surface 51, which is formed on its end facing the second valve needle part 220 end face, on the first contact surface 61 of the second valve needle 220, which is also formed on the end face of the second valve needle 220.
  • the contact surfaces 51, 61 instead of the contact surfaces 51, 61, the contact surfaces 51 ', 61' formed on the pin 43 or the molding 48 come into contact with one another.
  • the pin 63, on which the second contact surface 62 is located abuts against the upper end of the slot 42 in the drawing, which forms the second contact surface 52 of the first valve needle part 120.
  • the second embodiment B corresponds in its function to the first embodiment A with the difference that the slot here in the recording 50 of the first valve needle part 120 is formed while the pin 43 is guided without play in a bore in the Anformung 48 of the second valve needle part 220.
  • the function of the first contact surfaces 51, 61 is identical to the embodiment A, while the second contact surfaces 52 ', 62' corresponding to the second slot 42 'in the receptacle 50 and the outer end of the pin 43 are formed.
  • FIG. 7c makes this arrangement again clearly opposite in a 90 degree rotated side view FIG. 7b , so that this side view of the drawn dotted line in FIG. 7b equivalent.
  • FIG. 8a, 8b and 8c a further embodiment of a coupler according to the invention is shown.
  • a knob-shaped Anformung 49 is formed, the function in about the Anformung 48 in the embodiment of FIGS. 5 and 6 equivalent.
  • the receptacle 50 which is formed on the first valve needle part 120, has a corresponding inner shape for receiving the nub-shaped projection 49.
  • Shape and size of receptacle 50 and knob-shaped Anformung 49 is selected so that in the closed position of the fuel injection valve, the first valve needle member 120 with the first contact surface 51, which is formed on the second valve needle member 220 end face, abuts an opposite end side of the second valve needle 220 that forms the first contact surface 61 of this valve needle part 220. It can also be provided that instead of the plant takes place between the upper end of the knob-shaped Anformung 49 and the bottom of the receptacle 50.
  • FIG. 8a again shows a side view corresponding to the drawn section line in FIG. 8b on this coupler.
  • the receptacle 50 In order to allow assembly, in this case the receptacle 50 must be open on one side, to introduce the knob-shaped Anformung 49 in the receptacle 50 by a movement perpendicular to the longitudinal axis of the valve needle 20 to allow.
  • FIG. 8c shows a side view of a further embodiment accordingly FIG. 8b in which, in order to increase the transferable forces, the nub-shaped formation 49 is not rotationally symmetrical but elongated.
  • FIGS. 9a and 9b show another driver 40, wherein the FIGS. 9a and 9b are shown rotated relative to each other by 90 degrees.
  • a T-shaped in cross section Anformung 48 is formed, wherein the first valve needle part 120, a gripping hook 64 is formed, which engages behind the Anformung 48.
  • the first contact surfaces 51, 61 on the first and second valve needle part 120, 220 and the second contact surfaces 52, 62 are axially spaced from each other so that thereby the idle stroke of the first valve needle part 120 is made possible.
  • the contact surfaces 51 ', 61' in the in FIG. 9b shown manner to transmit the closing force.
  • FIG. 10 shows a further embodiment of the driver 40 according to the invention.
  • the second valve needle part 220 in turn has a Anformung 48, on the Anformung 48, a second contact surface 62 is formed.
  • the first valve needle part 120 is surrounded by a connecting sleeve 55, which is fixedly connected to the first valve needle part 120 by a locking pin 54.
  • the connection between the connecting sleeve 55 and the first valve needle part 120 can also be formed by a non-positive or integral connection 57, which may be, for example, a welded or soldered connection.
  • the connecting sleeve 55 forms by its shape a receptacle 50 for the Anformung 48 of the second valve needle part 220, so that on the connecting sleeve 55, the second contact surface 52 is formed opposite to the second contact surface 62 of the second valve needle 220.
  • the first contact surface 51 is formed on the first valve needle part 120 and lies opposite the first contact surface 61 of the second valve needle part 220, which forms the valve seat facing away from the end face of this valve needle part.
  • the axial distance of the first contact surface 61 from the second contact surface 62 of the second valve needle part 220 is in this case smaller than the axial distance of the first contact surface 51 from the second Contact surface 52 of the first valve needle part 120, wherein the connecting sleeve 55 is considered here as part of the first valve needle part 120 and may be formed integrally therewith.
  • FIG. 11 shows a similar driver as FIG. 10 but here the connection sleeve 55 'is connected to the second valve needle part 220 by a locking pin 54 or alternatively by a non-positive or integral connection 57' as a welding or soldering connection.
  • the Anformung 48 is formed on the first valve needle part 120, but acts in the same way with the formed by the connecting sleeve 55 'receptacle 50 together.
  • FIG. 12 shows a further embodiment of the fuel injection valve according to the invention.
  • the second valve needle part 220 has a guide section 27, with which the second valve needle part 220 is guided in the pressure chamber 19.
  • the second valve needle part 220 merges into a guide pin 39, which has a diameter that is significantly reduced compared to the remaining valve needle part 220.
  • the first valve needle part 120 is again guided in the sleeve 29 and has at its end facing the second valve needle part 220 a guide bore 38, which is designed as a blind bore and which receives the guide pin 39, so that it is guided longitudinally movable within the guide bore 38.
  • a driving sleeve 41 is attached to the first valve needle part 120, by which a mechanical driver 40 is formed.
  • the driver sleeve 41 is rotationally symmetrical and, for example, by a welded connection, firmly connected to the first valve needle part 120.
  • a collar 36 is formed with the second contact surface 62 as the valve seat 23 facing annular surface, wherein the driving sleeve 41, the collar 36 overlaps and thereby produces the coupling between the two valve needle parts 120, 220.
  • the second contact surface 52 is formed on the driver sleeve 41, wherein the two contact surfaces 52, 62 abut each other during the opening stroke of the valve needle 20.
  • the first contact surface 51 corresponding to the closing movement of the valve needle 20 is formed, which faces the corresponding first contact surface 61 on the second valve needle part 220.
  • valve needle 20 The opening of the valve needle 20 is analogous to the embodiments described above: When the injection valve is closed, the valve needle 20 in contact with the valve seat 23 and thereby closes the injection ports 25. For this presses the first valve needle part 120, driven by the fuel pressure in the control chamber 30, with the first Contact surface 51 against the first contact surface 61 of the second valve needle part 220. The second contact surfaces 52, 62 are spaced by the idle stroke h l , as FIG. 12a in a detail enlargement shows.
  • the first valve needle part 120 moves through the hydraulic forces in the direction of the control chamber 30, the second valve needle part 220 initially remaining at rest until the first valve needle part 120 closes the idle stroke h l has passed through and the second contact surface 52 of the first valve needle part 120 bears against the second contact surface 62 of the second valve needle part 220.
  • the second valve needle part 220 is then entrained by the movement of the first valve needle part 120 and moves therewith away from the valve seat 23, which connects the injection openings 25 with the pressure chamber 19 and releases the fuel flow from the pressure chamber 19 through the injection openings 25.
  • the pressure in the control chamber 30 is increased by re-actuating the control valve, so that the hydraulic pressure on the first valve needle part 120 presses this in the direction of the valve seat 23.
  • the second contact surfaces 52, 62 move away from each other and the two valve needle parts 120, 220 move back into their closed position.
  • the assembly of the valve needle 20 can be done in this embodiment as follows.
  • the driving sleeve 41 is pushed from the valve sealing surface 22 over the second valve needle part 220 up to its opposite end.
  • the first valve needle part 120 is pushed with the guide bore 38 on the guide pin 39 until the driver sleeve 41 in the in FIG. 12 shown position.
  • the welded connection between the driving sleeve 41 and the first valve needle part 120 is produced.
  • the first valve needle part 120 here has no guide bore 38 and the second valve needle part 220, no corresponding guide pin 39 is formed, but the opposite end faces of the valve needle parts 120, 220 are ground flat and form the first contact surface 51, 61.
  • a central bore 44 in which between the throttle plate 4 and the first valve needle member 120 under bias a tension spring 47 is arranged. The tension spring 47 ensures that the first valve needle part 120 rests with its first contact surface 51 in the closed position of the valve needle 20 against the first contact surface 61 of the second valve needle part 220.
  • a driver sleeve 41 ' is provided, which is fixedly connected in this embodiment with the second valve needle part 220, for example by a welded connection or by pressing.
  • a collar 53 is formed, which comprises the driver sleeve 41 ', wherein on the collar 53 and the inside of the driver sleeve 41', the second contact surface 52 of the first valve needle part 120 and the second contact surface 62 of the second valve needle 220 is formed.
  • the operation is otherwise identical to that in FIG. 12 shown embodiment.
  • FIG. 14 is a variant of in FIG. 13 shown embodiment shown in longitudinal section.
  • a sleeve-like extension 58 formed on the second valve needle part 220 on the inside of a ring 31 is preferably fixedly mounted by welding.
  • the sleeve-like Extension 58 and the ring 31 have the same function as the drive sleeve of in FIG. 13 shown embodiment, so that reference is made to the comments on this embodiment with respect to the further details and the function.
  • FIG. 15 is shown a further embodiment of the fuel injection valve according to the invention.
  • the two valve needle parts 120, 220 are here - as in the in FIG. 13
  • the mechanical driver is formed by the driver sleeve 41 ", which is fixedly connected to the first valve needle part 120, preferably by a welded connection Ring 71 is attached, also preferably by a welded connection, on which the second contact surface 62 of the second valve needle part 220 is formed, which is opposite to the second contact surface 52 of the first valve needle part 120.
  • the first contact surfaces 61 can also be formed, which then interacts with the first contact surface 51 on the underside of the catch sleeve 41 ".
  • FIG. 16 is a variant of in FIG. 13 shown injector shown in longitudinal section. Instead of the collar 53, here a sleeve element 70 is attached to the first valve needle part 120, which assumes this function.
  • the sleeve member 70 is connected by a welded connection fixed to the first valve needle part 120 or shrunk or pressed onto this. Regarding the operation is on the comments on the embodiment of FIG. 13 directed.

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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)
EP20110182517 2010-09-29 2011-09-23 Soupape d'injection de carburant pour moteurs à combustion interne Not-in-force EP2458194B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010041629 2010-09-29

Publications (3)

Publication Number Publication Date
EP2458194A2 true EP2458194A2 (fr) 2012-05-30
EP2458194A3 EP2458194A3 (fr) 2013-07-24
EP2458194B1 EP2458194B1 (fr) 2014-08-20

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EP20110182517 Not-in-force EP2458194B1 (fr) 2010-09-29 2011-09-23 Soupape d'injection de carburant pour moteurs à combustion interne

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EP (1) EP2458194B1 (fr)
DE (1) DE102011083260A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
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WO2017067930A1 (fr) * 2015-10-23 2017-04-27 Delphi International Operations Luxembourg S.À R.L. Injecteur de carburant

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DE102012010614B4 (de) * 2012-05-30 2014-07-03 L'orange Gmbh Injektor
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DE19954802A1 (de) * 1999-11-13 2001-05-17 Bosch Gmbh Robert Brennstoffeinspritzventil
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017067930A1 (fr) * 2015-10-23 2017-04-27 Delphi International Operations Luxembourg S.À R.L. Injecteur de carburant
FR3042822A1 (fr) * 2015-10-23 2017-04-28 Delphi Int Operations Luxembourg Sarl Injecteur de carburant
US10502170B2 (en) 2015-10-23 2019-12-10 Delphi Technologies Ip Limited Fuel injector

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EP2458194A3 (fr) 2013-07-24
DE102011083260A1 (de) 2012-03-29

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