EP2021618A1 - Injecteur de carburant comportant une soupape de commande à compensation de pression - Google Patents

Injecteur de carburant comportant une soupape de commande à compensation de pression

Info

Publication number
EP2021618A1
EP2021618A1 EP07727029A EP07727029A EP2021618A1 EP 2021618 A1 EP2021618 A1 EP 2021618A1 EP 07727029 A EP07727029 A EP 07727029A EP 07727029 A EP07727029 A EP 07727029A EP 2021618 A1 EP2021618 A1 EP 2021618A1
Authority
EP
European Patent Office
Prior art keywords
armature
valve
seat
pin
bore
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
EP07727029A
Other languages
German (de)
English (en)
Other versions
EP2021618B1 (fr
Inventor
Nadja Eisenmenger
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 EP2021618A1 publication Critical patent/EP2021618A1/fr
Application granted granted Critical
Publication of EP2021618B1 publication Critical patent/EP2021618B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • 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
    • 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
    • F02M63/0073—Pressure balanced valves
    • 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
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F02M63/008—Hollow valve members, e.g. members internally guided
    • 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
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/304—Fuel-injection apparatus having mechanical parts, the movement of which is damped using hydraulic means
    • 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators

Definitions

  • An injector for injecting fuel into a combustion chamber of an internal combustion engine in which an injection valve member is actuated via a solenoid-operated control valve is known, for example, from EP-A 1 612 403.
  • a flow restrictor from a control room in the fuel return can be closed or released.
  • the control chamber is bounded on one side by a control piston, with which an injection valve member is controlled, which releases or closes at least one Einspritzöffhung in the combustion chamber of the internal combustion engine.
  • the outlet throttle is received in a body, which is provided on the side facing away from the control chamber with a tapered valve seat. In this valve seat, a closing element is adjustable, which is connected to the armature of the solenoid valve.
  • an edge is formed on the closing element, which is provided against the conically shaped seat.
  • the closing element moves on an axial rod, which is integrally connected to the body in which the drainage throttle is formed.
  • the invention relates to an injector for injecting fuel into a combustion chamber of an internal combustion engine, in which an injection valve member, which releases or closes at least one injection opening, is actuated by a control valve.
  • the control valve releases or closes a connection from a control chamber into a fuel return by placing or releasing a closing element in a seat.
  • the seat is preferably designed as a ground flat seat and the closing element comprises a ground surface, which is adjustable in the seat, wherein in the closing element, a bore is formed, in which a pin is received.
  • the diameter of the bore substantially corresponds to the diameter of the flat seat.
  • Advantage of the embodiment according to the invention is that the fact that the diameter of the bore substantially corresponds to the diameter of the flat seat, no axial compressive forces act on the closing element.
  • the seat can also assume any other form in which essentially no axial forces act on the closing element.
  • the closing element is annular, so that no surface exists, can act on the compressive forces in the axial direction.
  • control valve of the inventively designed injector is a pressure-balanced 2/2-way solenoid valve.
  • magnet for driving the control valve any other, known in the art actuator is conceivable.
  • a control valve can be used, which is actuated with a piezoelectric actuator or any other actuator which allows rapid actuation.
  • the closing element on which the ground surface is formed which is adjustable in the seat, a valve needle.
  • the bore is made, in which the pin is received.
  • the pin is preferably supported with a side against a push rod or the injector.
  • the fuel pressure acting on the pin is thus delivered to the injector housing or to the push rod.
  • the push rod is preferably designed so that it is also supported on the housing.
  • no pressure force in the axial direction acts on the valve needle.
  • the pen is used only for pressure recording.
  • the valve needle is guided in a ground anchor guide.
  • the armature guide surrounds the valve needle on its outer circumference. Advantage of this arrangement is that the leadership of the valve needle does not have to serve as a sealing element at the same time.
  • Another advantage of the leadership of the valve needle on the outer periphery is that the seal of the outlet throttle is decoupled from the leadership of the valve needle.
  • the sealing takes place on the one hand via the flat seat and on the other via a sealing gap, which is carried out between the bore and the pin, while the guide of the valve needle takes place on the outer periphery, where no seal against fuel under system pressure is required. In particular, at high fuel pressures, a smaller diameter of the sealing gap is necessary to reduce occurring leakage.
  • the minimum possible diameter is predetermined by the processing tools here.
  • the seal diameter can be made much smaller than the diameter of the ground guide. As a result, the leakage current compared to a guide, which also acts as a sealing surface, reduced.
  • control valve is a solenoid valve, wherein the ground surface, which can be placed in the flat seat to release the connection from the outlet throttle in the fuel return or closed, is formed at the armature of the solenoid valve.
  • Advantage of this embodiment is that can be dispensed with an additional valve needle. As a result, less high-precision manufactured parts are needed, which costs can be saved. Another advantage is that only the mass of the armature has to be moved, allowing faster shifting.
  • the armature is guided with an extension in an armature guide, which is formed on a valve piece and surrounds the armature.
  • the bore is formed in which the pin is guided, which receives the pressure force acting in the axial direction and transmits to the housing.
  • the bore in the extension of the armature serves only to seal the outlet throttle against fuel under system pressure by the pin received therein and absorb the pressure force.
  • the guide is decoupled from the sealing function and takes place on the outer circumference of the extension at the anchor. Another advantage of this embodiment is that the guide on the outer circumference of the extension of this has a larger dimension and thus can be made easier.
  • the pin received in the bore is a guide pin and the bore is formed in the anchor.
  • the ground surface which is placed in the flat seat, formed on the armature.
  • the armature on which the ground surface is formed, which can be adjusted for closing or releasing the outlet throttle in the ground flat seat, is guided with a guide on the outer circumference in the inner magnetic core.
  • the bore is formed, in which the pin is received, which receives the pressure force acting in the axial direction.
  • the armature acts as a closing element, a valve needle is not required.
  • the guide function is decoupled from the sealing function. At the same time, this also makes it possible to construct the injector in a compact manner, since an additional guide length between magnet and valve piece is not necessary.
  • FIG. 1 shows a section of an injector with a control valve with valve needle
  • FIG. 2 shows an enlargement of the valve seat according to FIG. 1,
  • FIG. 3 a detail of an injector with a control valve, in which the valve seat is formed on the armature;
  • FIG. 4 shows a detail of a fuel injector with a control valve, in which the valve seat is formed on the armature, in a second embodiment
  • Figure 5 shows a detail of an injector with control valve, wherein the valve seat is formed on the armature, in a third embodiment.
  • Figure 1 shows a section of a fuel injector with a control valve, in which a valve seat is formed as a ground surface on a valve needle.
  • An inventively designed fuel injector 1 comprises a control valve 2, which is designed as a 2/2-way solenoid valve.
  • the hydraulic forces are minimized via a pressure compensation. This allows the spring force can be reduced with less stroke and larger Querterrorismsfikiee. As a result, shorter switching times and better dynamics over the valves known from the prior art are possible.
  • This is achieved in that in a valve needle 3, which is adjustable in a seat 4, a bore 5 is formed. In the bore 5, a pin 6 is added. So that no pressure forces acting in the axial direction act on the valve needle 3, the diameter of the bore 5 is substantially equal to the diameter of the seat 4.
  • an outlet throttle 7 closable or releasable via which fuel from a control chamber 8 via a return 9 can run in a low pressure region, not shown here.
  • the control chamber 8 is bounded on one side by a control piston 10.
  • injection valve member is actuated, which releases at least one injection port into a combustion chamber of an internal combustion engine or closes.
  • the control piston 10 is guided in a bore 11 in a valve piece 12.
  • fuel can flow from a valve chamber 12 enclosing annular space 14 in the control chamber 8.
  • the fuel inlet 15 is connected to a high-pressure accumulator, also not shown here, in which is stored under system pressure fuel.
  • valve piece 12 is screwed by means of a valve clamping screw 16 in an injector 17.
  • the control valve 2 is controlled by a magnet 18, which is designed as an electromagnet. As soon as the magnet 18 is energized, a magnetic field is formed, which acts on an armature 19. In the armature 19, a bore 20 is formed, in which the valve needle 3 is guided. At the anchor 19, a sleeve 21 connects. The sleeve 21 serves as a guide for the valve needle 3. To adjust the valve lift, a collar is formed on the sleeve 21, which rests on a disc 38, which in turn rests on the valve piece 12. The composite of the collar on the sleeve 21, the disc 38 and the valve piece is bolted to the valve clamping screw. The thickness of the disc 38, the valve lift is determined. To limit the stroke, the extension 22 of the valve needle 3 abuts against an end face 23 of the sleeve 21.
  • the armature 19 is accommodated in an armature space 24 in which the fuel flows out of the control space 8 when the control valve 2 is open. From the armature chamber 24, the fuel passes through a spring chamber 25 and a bore 26 in a spring plate 27 in the return. 9
  • a spring element 30 is received in the spring chamber 25, which provides the valve needle 3 in its seat when magnet 18 is not energized.
  • the spring element 30 is preferably designed as a compression spring coil spring. This is supported with one side against the valve needle 3 and with the other side against the spring plate 27 from. In this case, the spring element 30 encloses a pin 31 formed on the spring plate 27 and the push rod 28.
  • the magnet 18 is energized. As a result, a magnetic field is formed, through which the armature 19 is pulled in the direction of the magnet 18.
  • the armature 19 acts on a ring 32, which engages in a groove 33 on the valve needle 3.
  • the valve needle 3 together with the armature 19 is moved in the direction of the magnet 18.
  • the valve needle 3 is guided in the sleeve 21. As soon as the valve needle 3 abuts with the extension 22 on the end face 23 of the sleeve 21, the opening movement is completed.
  • Fuel that is at system pressure can flow out of the control chamber 8 via the outlet throttle 7, the armature chamber 24, the spring chamber 25 and the return 9. The pressure in the control chamber 8 decreases.
  • control piston 10 is no longer pressure-balanced and moves into the control chamber 8. This results in a movement of the injection valve member, not shown here in the direction of the control piston 10, whereby the at least one injection port is released and fuel flows into the combustion chamber of the internal combustion engine.
  • valve seat 4 is shown enlarged.
  • a ground flat seat 34 is formed on the valve piece 12.
  • a ground surface 35 is formed, which is placed on the ground flat seat 34 in order to close the outlet throttle 7. Since the inner diameter 36 of the ground surface 35 corresponds to the diameter of the bore 5, acts on the valve needle 3 no pressure force in the axial direction. However, it is possible for manufacturing reasons, to grind a bevel 36 on the valve needle 3. In this case, a small proportion of the pressure acts on the chamfer 36 in the axial direction.
  • the pin 6 is guided in the bore 5 with a narrow guide play. This creates a seal over a narrow gap.
  • the pin 6 serves only to seal the bore 5 and that no pressure force in the axial direction acts on the valve needle 3.
  • a guide of the valve needle 3 by the pin 6 is not given.
  • the leadership of the valve needle 3 is rather in the sleeve 21. Due to the much larger inner diameter of the sleeve 21, this guide can be made easier with the required surface quality than a corresponding guide through the hole. 5
  • Figure 3 shows a section of a fuel injector, wherein the valve seat is formed at the armature of a solenoid valve.
  • the seat 4, with which the outlet throttle 7 can be closed or released is formed directly on an extension 40 on the armature 19.
  • the extension 40 is guided in an armature guide 41, which is formed on the valve piece 12.
  • the guide on the outer diameter of the extension 40 so that the armature guide 41 can be dimensioned correspondingly large.
  • the armature guide 41 opens to the outlet throttle 7 in an inner valve chamber 42. This is connected via a channel 43 with an outer valve chamber 44.
  • a bore 45 is executed, in which the pin 6 is guided.
  • a ground surface 35 is formed on the extension 40 of the armature 19, which is placed in a ground flat seat 34 on the valve member 12 to close the outlet throttle 7.
  • the inner diameter of the bore 45 is exactly as large as the inner diameter of the ground surface 35.
  • This acts on the extension 40 and thus on the armature 19 no pressure force in the axial direction.
  • the compressive force in the axial direction is absorbed by the pin 6, which is supported against the push rod 28.
  • the push rod 28 is in turn supported on a housing cover 46, so that the pressure force of pin 6 is transmitted via the push rod 28 to the housing cover 46.
  • the magnet 18 is energized. As a result, the armature 19 is pulled in the direction of the magnet 18. Inside the magnet 18, a sleeve 47 is received, which serves as a stroke stop. Once the armature 19 abuts in the sleeve 47, the lifting movement is completed. By the movement of the armature 19, the ground surface 35 lifts out of the ground flat seat 34 and thus releases a connection from the outlet throttle 7 in the inner valve chamber 42. Thus, the fuel under system pressure flows from the control chamber 8 via the outlet throttle 7 into the inner valve chamber 42. Via the channel 43, the fuel passes further into the outer valve chamber 44, which is connected to a fuel return. As a result, the pressure in the control chamber 8 decreases, the control piston 10 is moved in the direction of the control chamber 8 and the injection valve member opens.
  • the energization of the magnet 18 is released.
  • a spring element 48 which is in the embodiment shown here designed as a helical spring compression spring
  • the armature 19 is moved back in the direction of the control chamber 8.
  • the formed on the extension 40 ground surface 35 is placed in the ground flat seat 34.
  • the outlet throttle 7 is closed.
  • Throttle 13 flows under system pressure fuel from the annular space 14, which is connected to a fuel inlet, into the control chamber 8, to prevail in this system pressure.
  • the control piston 10 is moved in the direction of the injection valve member.
  • the injection valve member is placed back in his seat and closes the at least one injection port.
  • the injection process is finished.
  • the spring element 48 with which the movement of the armature 19 is supported in the direction of the control chamber 8, surrounds the push rod 28 in the embodiment shown here. At the same time, the spring element 48 is received in the sleeve 47.
  • FIG. 4 shows a detail of a fuel injector with a control valve, in which the valve seat is formed on the armature, in a second embodiment.
  • the armature 19 is guided in the embodiment shown in Figure 4 on a guide pin 50.
  • the guide pin 50 is received in a guide slot 51, which is formed in the embodiment shown here as a bore in the armature 19.
  • the seat 4 is formed on the armature 19, with which the outlet throttle 7 can be closed or released.
  • the valve seat 4 is preferably designed as shown in Figure 2, with a ground flat seat 34 on the valve member 12 and a ground surface 35 on the armature 19.
  • the inner diameter of the ground surface 35 on the armature 19 has the same diameter the bore 51, which forms the guide gap with the guide pin 50, acts on the armature 19 no pressure force in the axial direction. This acts only on the guide pin 50.
  • a diameter extension 52 is made on the guide pin 50.
  • the stroke 53 of the armature 19 is limited by the fact that this abuts the diameter extension 52.
  • the guide pin 50 is connected to the diameter extension 52 fixed to a cover plate 57 which closes the solenoid valve. The connection can be done, for example, positive or positive.
  • the pressure pin 50 may be formed with the diameter extension 52 in one piece with the cover plate 57.
  • the armature 19 and the magnet 18 are enclosed by an annular component 54.
  • the height of the component 54 and the length of the diameter extension 52 of the stroke 53 of the armature 19 is adjusted.
  • the component 54 is preferably provided with apertures 55.
  • the magnet 18 is energized.
  • the armature 19 is moved in the direction of the magnet 18 until it abuts the diameter extension 52.
  • the armature 19 rises from the seat 4. This releases a connection from the control chamber 8 via the outlet throttle 7 and the openings 55 to the fuel return. Fuel flows out of the control chamber 8.
  • the pressure in the control chamber 8 decreases and the control piston 10 moves into the control chamber 8.
  • the injection valve member is thereby lifted out of its seat and releases the at least one injection opening.
  • the energization of the magnet 18 is released.
  • a spring element 56 which surrounds the diameter extension 52 and is preferably a helical spring designed as a compression spring, the armature 19 with the ground surface 35 is placed in the ground flat seat 34 and thus closes off the abraded surface.
  • running throttle 7. About the fuel inlet 15 and the inlet throttle 13 under system pressure standing fuel flows into the control chamber 8 a. In the control chamber 8, the pressure on system pressure increases. As a result, the control piston 10 is moved in the direction of the injection valve member. This results in that the injection valve member is placed back in his seat and closes the at least one injection port.
  • FIG. 5 shows a detail of a fuel injector with a control valve, in which the valve seat is formed on the armature, in a third embodiment.
  • the fuel injector 1 shown in Figure 5 differs from the injector shown in Figure 4 in that the armature 19 is not guided via a guide pin 50, but in an armature guide 60, which is formed in an inner magnetic core 61.
  • the inner magnetic core 61 is executed in the embodiment shown here as an annular extension on an upper housing part 62, with which the injector is closed, executed.
  • the inner magnetic core 61 is enclosed by the magnet 18.
  • the inner magnetic core 61 serves as a stroke stop 63 to limit the stroke of the armature 19.
  • a sleeve-shaped extension 64 is formed, which is guided in the armature guide 60.
  • the upper housing part 62 is held on the injector body 17 by means of a clamping nut 65.
  • the magnet 18 is energized.
  • the armature 19 moves in the direction of the magnet, as a result of which the ground surface 35 formed on the armature lifts out of the ground flat seat 34 and thereby releases the seat 4.
  • It can drain fuel from the control chamber 8 via the outlet throttle 7 in the armature space 24.
  • the pressure in the control chamber 8 is lowered and the control piston 10 is moved into the control chamber 8, whereby the injection valve member releases the at least one injection opening.
  • the fuel flows via a channel 66 into the spring chamber 25 and from there via a bore 26 in the spring plate 27 into the return 9.
  • a spring element 67 is received in the spring chamber 25, which is preferably a helical spring designed as a compression spring.
  • the armature 19 with the sleeve-shaped extension and the ground surface 35 can be made in one piece or, as shown in Figure 5, in two pieces.
  • an extension 69 is formed on the component, which comprises the sleeve-shaped extension 64 and the ground surface 35, which abuts against the stroke stop 63 when the magnet 4 is energized and thus the seat 4 is open.
  • the seat 4 can also take any other form in which act substantially no axial compressive forces on the seat. This is for example always the case when the closing element is annular.
  • the pressure pin (6) is supported against the push rod (28), which in turn is supported against the spring plate (27), it is also possible that the pressure pin (6) is supported directly against the injector , It is also possible that the pressure pin (6) or the push rod (28) are integrally formed with the injector. In addition, the pressure pin (6) or the push rod (28) can also be stepped, that is to say executed in several different diameters.

Landscapes

  • 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)
  • Magnetically Actuated Valves (AREA)

Abstract

L'invention concerne un injecteur destiné à injecter du carburant dans la chambre de combustion d'un moteur à combustion interne. Selon l'invention, un élément de soupape d'injection ouvrant ou fermant au moins une ouverture d'injection est commandé par une soupape de commande (2). La soupape de commande (2) ouvre ou ferme une connexion d'un espace de commande (8) vers une conduite de retour de carburant (9). Dans la conduite de retour de carburant (9), un obturateur (3, 19) est logé dans un siège (4) ou libère celui-ci. L'obturateur (3, 19) comporte un alésage (5; 45; 51) recevant une tige (6), et le diamètre (36) de l'alésage (5; 45; 51) correspond essentiellement au diamètre du siège (4). La tige (6) s'appuie avec un côté contre une tige de pression (28), contre une coupelle de ressort (27) ou contre le boîtier d'injecteur (17; 62).
EP07727029A 2006-05-10 2007-03-19 Injecteur de carburant comportant une soupape de commande à compensation de pression Active EP2021618B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006021741A DE102006021741A1 (de) 2006-05-10 2006-05-10 Kraftstoffinjektor mit druckausgeglichenem Steuerventil
PCT/EP2007/052551 WO2007128613A1 (fr) 2006-05-10 2007-03-19 Injecteur de carburant comportant une soupape de commande à compensation de pression

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EP2021618A1 true EP2021618A1 (fr) 2009-02-11
EP2021618B1 EP2021618B1 (fr) 2010-09-01

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EP07727029A Active EP2021618B1 (fr) 2006-05-10 2007-03-19 Injecteur de carburant comportant une soupape de commande à compensation de pression

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US (1) US7870847B2 (fr)
EP (1) EP2021618B1 (fr)
CN (1) CN101490403B (fr)
AT (1) ATE479837T1 (fr)
DE (2) DE102006021741A1 (fr)
RU (1) RU2441171C2 (fr)
WO (1) WO2007128613A1 (fr)

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Also Published As

Publication number Publication date
DE102006021741A1 (de) 2007-11-15
EP2021618B1 (fr) 2010-09-01
US20090308354A1 (en) 2009-12-17
RU2008148285A (ru) 2010-06-20
ATE479837T1 (de) 2010-09-15
US7870847B2 (en) 2011-01-18
RU2441171C2 (ru) 2012-01-27
DE502007004936D1 (de) 2010-10-14
WO2007128613A1 (fr) 2007-11-15
CN101490403B (zh) 2012-06-13
CN101490403A (zh) 2009-07-22

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