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EP2032835B1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP2032835B1
EP2032835B1 EP07728519A EP07728519A EP2032835B1 EP 2032835 B1 EP2032835 B1 EP 2032835B1 EP 07728519 A EP07728519 A EP 07728519A EP 07728519 A EP07728519 A EP 07728519A EP 2032835 B1 EP2032835 B1 EP 2032835B1
Authority
EP
European Patent Office
Prior art keywords
pressure
valve
fuel
sealing edge
fuel injector
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.)
Not-in-force
Application number
EP07728519A
Other languages
German (de)
English (en)
Other versions
EP2032835A1 (fr
Inventor
Nadja Eisenmenger
Michael Mennicken
Hans-Christoph Magel
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 EP2032835A1 publication Critical patent/EP2032835A1/fr
Application granted granted Critical
Publication of EP2032835B1 publication Critical patent/EP2032835B1/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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/188—Spherical or partly spherical shaped valve member ends
    • 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
    • F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
    • F02M63/0007—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using electrically actuated 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
    • F02M63/0014—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
    • 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
    • F02M63/0045—Three-way valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9007—Ceramic materials
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9053—Metals
    • 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 present invention relates to a fuel injector according to the preamble of claim 1.
  • Fuel injectors of the type of interest here find particular application in internal combustion engines, which use such injectors to allow the metered injection of the fuel to be burned.
  • the fuel injector disclosed herein comprises a pressure intensifier, the booster piston of which separates a working space fueled by a pressure accumulator from a pressure-relieving differential pressure chamber.
  • a pressure change in the differential pressure chamber via an actuation of the servo valve, which releases or closes a hydraulic connection of the differential pressure chamber to a first low-pressure side return.
  • the servo valve also has a servo valve piston guided between a control chamber and a first hydraulic chamber. At this a servo valve piston is constantly formed in System horrbeetzschung in the opening direction hydraulic surface and a low-pressure side return occlusive or releasing first sealing seat formed.
  • the DE 10 2004 015 5 744 A1 discloses a generic fuel injector for injecting fuel into a combustion chamber of an internal combustion engine having an injector housing having a fuel inlet communicating with a central fuel high pressure source external to the injector housing and with a pressure space within the injector housing depending upon Position of a control valve, in particular a 3/2-way valve is injected with high-pressure fuel.
  • a valve piston is provided in the 3/2-way valve, which is hydraulically coupled to the piezoelectric actuator, which is acted upon by the pressure from the high-pressure fuel source.
  • the valve piston is introduced into a valve control chamber and seals against sealing edges, which are introduced in the sealing control room itself.
  • a fuel injector is known, wherein the 3/2-way valve as a valve member comprises a ball member which is movable in the rest position against a first sealing edge and in the Einspritzstrellung against a second sealing seat.
  • the 3/2-way valve as a valve member comprises a ball member which communicates with a second end surface of the valve piston and is movable in the rest position against a first sealing edge and in the injection position against a second sealing edge, wherein, for pressure-balanced switching, the first end surface of the valve piston and the part surface arranged opposite thereto on the ball element, which is bounded by the second sealing edge, have approximately equal effective areas against which the pressure originating from the high-pressure fuel source is applied.
  • valve piston can be stirred only as a simple cylindrical component, wherein the sealing seats of the 3/2-way valve are formed by means of the ball element.
  • the ball element is introduced in the valve control chamber and freely movable in this. This results in a self-centering of the ball in the sealing seats, since they are annular and the ball element is moved only by the fluid pressure of the liquid or by the valve piston itself.
  • the ball element is preferably arranged adjacent to the valve piston, wherein a simple solid state contact is sufficient; However, it is also possible to connect the ball by means of any joining method with the valve piston.
  • the diameter of the valve piston and the diameter at the first sealing edge preferably have a ratio which allows a pressing of the ball element in the rest position with low contact force against the first sealing edge.
  • a further advantageous embodiment of the present invention provides that the ball element is received in the valve control chamber and the sealing edges are formed in the contour of the valve control chamber. Only with the sealing edges formed on the inside in the valve control space can the ball element be reciprocated by a first sealing edge and a second sealing edge. In this case, the ball can center the ball element both in the first annular sealing edge and in the second annular sealing edge for the rest position or the injection position of the fuel of the injection valve itself, so that a reliable sealing effect is ensured.
  • the valve control chamber has a radially symmetrical inner contour, so that the ball element in each case forms an annular sealing contact against the sealing edges.
  • the valve body comprises, as in the aforementioned prior art, first and second sealing edges, which are formed as stepped circular bores on the inside in the valve body.
  • first and second sealing edges which are formed as stepped circular bores on the inside in the valve body.
  • the concentricity of the individual sealing edges is not required in the same quality, since the ball is freely movable and centered in the rotationally symmetric, ie annular sealing edge approach itself.
  • a further embodiment of the present invention provides that the valve control is acted upon by the pressure from the Kraftstoffuochdruckario when the ball member seals in the rest position against the first sealing edge, whereas the Ventitberichtraum is relieved of pressure against a return passage, when the ball member in the injection position against the second sealing edge seals.
  • the injector In the rest position of the valve piston, the injector is not activated, i. there is no injection.
  • the valve piston is acted upon by high pressure fuel from the fuel injector into the combustion chamber of an internal combustion engine.
  • the diameter of the valve piston is smaller than the diameter of the first sealing edge. Characterized a small hydraulic contact pressure of the ball is generated in the rest position of the valve piston in the seat of the first sealing edge, which ensures a tight contact of the first sealing edge with the ball element.
  • a further advantageous embodiment provides that the diameter of the second sealing edge is smaller than the diameter of the valve piston.
  • the geometric shape of the valve piston is formed in the manner of a cylindrical base body or has a cylindrical base body portion with a stepped cylindrical end portion of smaller diameter.
  • the ball element comprises a metallic or ceramic material and / or is formed as a standard rolling bearing body.
  • the valve control chamber communicates with a pressure booster control chamber.
  • the pressure intensifier control chamber is used to control a pressure booster piston, which can be accommodated reciprocably in the injector housing.
  • the valve control chamber may communicate with a nozzle needle control chamber.
  • the injector housing comprises a hydraulic coupling space which is acted upon by the pressure of the high-pressure fuel source and via which the piezoactuator is hydraulically coupled to the first end face of the valve piston.
  • a substantially circular-cylindrical head made of metal can be attached to the piezoactuator, its end face defining the hydraulic coupling space.
  • the hydraulic coupling space is preferably limited by a first end surface of the valve piston. The hydraulic coupling space serves to compensate for volume expansions of the piezoelectric actuator due to temperature fluctuations during operation. In addition, a force / displacement ratio between piezoelectric actuator and valve piston can thus be realized.
  • the valve piston has an annular groove, which can be acted upon by the pressure of the high-pressure fuel source, so that an outflow of the fluid from the coupling space can be prevented. Furthermore, a lubrication of the valve piston in the valve body is created by the annular groove, which optimizes at least the tribological behavior during the axial movement of the valve piston.
  • a further embodiment of the invention provides that the piezoelectric actuator comprises electrical connections, wherein these are designed as external contacts, to provide protection from the fuel in the piezoelectric chamber. Furthermore, it is provided that the piezoelectric actuator has a coating at least outside the region of the electrical connections, which protects the contact layers of the piezoelectric actuator from the environment, in particular from the fuel in the piezoelectric actuator space. This ensures that the electrical contacts of the piezoelectric actuator are isolated from the fuel in order to counteract a possible risk of fire.
  • a fuel injector 1 is shown in a longitudinal section, which is supplied via a schematically indicated high-pressure source 2 (common rail) with fuel under high pressure.
  • a fuel line 3, 4 extends to a pressure booster 5, which is integrated into the fuel injector 1.
  • the pressure booster 5 is enclosed by an injector 6.
  • the injector housing 6 comprises an injector body 7 and a nozzle body 8, which has a central guide bore 9.
  • a nozzle needle 10 is arranged back and forth.
  • the nozzle needle 10 has a tip 11, on which a sealing surface is formed, which cooperates with a sealing seat.
  • the nozzle body 8 comprises a pressure chamber 15, wherein on the nozzle needle 10, a pressure shoulder 14 is formed, which is arranged in the pressure chamber 15.
  • the nozzle needle 10 is biased by a nozzle spring 16 with its tip 11 against the associated nozzle needle seat.
  • the nozzle spring 16 is arranged even in the pressure chamber 15, wherein it is connected to a connecting channel 18, in which a throttle 21 is installed, and is in communication with a pressure booster control chamber 23.
  • the pressure chamber 15 is connected via a connecting channel 20, in which a throttle 21 is provided with a pressure booster chamber 22 in connection.
  • a piston extension 24 is reciprocally accommodated, which end is formed on a pressure booster piston 25.
  • the pressure booster chamber 22 is itself formed in the injector body 7, so that the Pressure booster piston 25 is received in the Injekton Sciences 7.
  • This has the shape of a circular cylinder, which has a smaller diameter than the adjoining part of the pressure booster piston 25.
  • the other end of the pressure booster piston protrudes into a pressure booster working chamber 26, which is connected via the fuel supply line 3, 4 with the high-pressure fuel source 2.
  • a booster spring 27 is arranged, with the aid of which the pressure booster piston 25 is biased from the direction of the nozzle needle 10.
  • the pressure booster chamber 22 is connected to the pressure chamber 15.
  • the pressure booster chamber 23 in turn communicates via a connecting channel 29 with the valve control chamber 30, which is formed in a valve body 31.
  • an intermediate piece 32 is arranged between the valve body 31 and the injector body 7, in which a central connecting channel 33 is recessed.
  • the connection channel 33 creates a connection between the pressure booster working space 26 and the valve control space 30.
  • the valve control chamber 30 has a larger diameter than the intermediate piece 32 facing away from the portion of the bore.
  • a valve piston 34 is received longitudinally movable. Adjacent to the valve piston 34, a ball element 35 is inserted in the valve control chamber 30, which can be brought into sealing contact against a first sealing edge 36 and a second sealing edge 37. If the valve control chamber is acted upon by pressure from the high-pressure fuel source, this is done at a rest position of the ball element 35, in which this seals against the first sealing edge 36, whereas the valve control chamber 30 via a return passage 38 is depressurized, when the ball member 35 in the injection position against the second sealing edge 37 seals. Between the valve piston and the first sealing edge 36, a return passage 38 is provided, which is in communication with a (not shown) fuel tank.
  • a piezoelectric actuator body 39 is arranged, which is closed by a cover 40.
  • the cover 40, the piezoelectric actuator body 39, the valve body 31, the intermediate piece 32, the injector body 7 and the nozzle body 8 together form the housing 6 of the injector.
  • a central piezoelectric actuator space 41 recessed, which communicates via a connecting channel 42 with the fuel supply line 3 and thus with the high-pressure source 2 in connection.
  • a piezoelectric actuator 43 is arranged, which has a piezoelectric actuator 44 made of metal with a free end face 45.
  • a collar 46 is formed at the piezoelectric actuator 44.
  • a piezoelectric actuator spring 47 is clamped between the collar 46 and a piezoelectric actuator sleeve 48.
  • the piezoelectric actuator head 44 is displaceable relative to the piezoelectric actuator sleeve 48 in the axial direction.
  • a sealing edge is formed, which rests against the valve body 31.
  • a hydraulic coupling chamber 41 is formed between the end face 45 of the piezoactuator head 44 and the free end face of the valve piston 34 and is acted upon with high pressure from the high pressure source 2.
  • Fig. 1 the fuel injector 1 is shown in a deactivated state.
  • the valve piston 34 is in its rest position.
  • the ball element 35 bears against the first sealing edge 36, which is formed in the valve body 31.
  • the valve control chamber 30 is also acted upon by the fuel supply lines 3, 4, the pressure booster working chamber 26 and the connecting channel 33 with rail pressure from the high pressure source 2.
  • the pressure booster chamber 23 is also acted upon by rail pressure via the connecting channel 29. In the pressure booster chamber 22 and the pressure chamber 15 there is also rail pressure.
  • the piezoelectric actuator 43 is energized via the electrical connections 53, 54 and expands.
  • the expansion of the piezoelectric actuator 43 leads via the piezoelectric actuator 44 to an increase in pressure in the hydraulic coupling chamber 49.
  • This pressure increase leads to an axial movement of the valve piston 34 downwards, ie, that the ball element 35 is moved downward.
  • the valve piston 34 and the ball member 35 move down so long until the ball member 35 comes to rest with the sealing edge 37 on the intermediate piece 32 and the connection between the connecting channel 33 and the valve control chamber 30 interrupts.
  • the ball element 35 lifts from the first sealing edge 36 from the sealing seat and opens a connection to the valve control chamber 30 and the return channel 38.
  • the valve piston 34 and the ball element 35 are thus in the injection position.
  • the valve control chamber 30 is relieved of pressure due to the connection to the return passage 38.
  • the 3/2-valve piston 34 is controlled directly by the piezoelectric actuator 43, wherein the valve piston 34 acts as a force or motion transmitting member on the formed as a sealing body ball member 35.
  • the 3/2-way valve with valve piston 34 and ball element 35 is carried out almost pressure balanced. This is achieved in that the ball element 35 is constantly acted upon by high pressure from the injector inlet, which relates to the connecting channel 33.
  • Fig. 2 is a fuel injector 1 without pressure intensifier 5 shown.
  • the device shown comprises the same structure as that of the in Fig. 1 illustrated fuel injector. Identical parts are provided with the same reference numerals. To avoid repetition, the preceding description of the Fig. 1 directed. In the following, only the differences between the two embodiments will be discussed.
  • fuel injector 1 is the valve control chamber 30 via a connecting channel 55, which includes a throttle 56, with the nozzle needle control chamber 57 in connection.
  • the nozzle needle control chamber 57 is disposed within a sealing sleeve 58 which is equipped with a biting edge.
  • the nozzle needle control chamber 57 is limited by an end face of a nozzle needle 59.
  • a collar 62 is formed, wherein between the collar 60 and the sealing sleeve 58, a nozzle spring 16 is arranged.
  • the biting edge of the sealing sleeve 58 is pressed against the injector.
  • the nozzle needle 59 is held with its tip due to the biasing force of the nozzle spring 16 in abutment with the associated nozzle needle seat.
  • the closed first sealing edge is shown 36 is opened and the second sealing edge 37 is closed. This causes a pressure increase in the hydraulic coupling chamber 49 and thereby a movement of the valve piston 34 and the ball member 35 down.
  • the first sealing edge 36 opens and the second sealing edge is closed with the ball member 35, so that a connection between the valve control chamber 30 and the return line 38 is released.
  • the valve control chamber 30 is depressurized.
  • This pressure relief also has an effect on the connecting channel 55 in the nozzle needle control chamber 57, so that fuel is injected into the combustion chamber of the internal combustion engine via flats 59 in the nozzle needle 10, since the nozzle needle 10 lifts from its seat.

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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)

Claims (10)

  1. Injecteur de carburant (1) pour l'injection de carburant dans une chambre de combustion (14) d'un moteur à combustion interne, comprenant un boîtier d'injecteur (6, 7, 31, 32, 39, 40) qui présente une conduite d'alimentation en carburant (3, 4) depuis une source de carburant haute pression (2) et qui peut être connecté fluidiquement à un espace de pression (15), comprenant en outre une soupape à 3/2 voies pour l'injection de carburant dans la chambre de combustion (14), laquelle présente un piston de soupape (34) qui peut être déplacé axialement en alternance entre une position de repos et une position d'injection, et qui est accouplé hydrauliquement à un actionneur piézoélectrique (43) par le biais d'une première surface d'extrémité (50) adjacente à un espace d'accouplement (49) et peut être activé, la soupape à 3/2 voies comprenant en tant qu'organe de soupape un élément en forme de bille (35) qui est en liaison avec une deuxième surface d'extrémité (51) du piston de soupape (34), caractérisé en ce que l'élément en forme de bille (35) peut être déplacé dans la position de repos contre une première arête d'étanchéité (36) et dans la position d'injection contre une deuxième arête d'étanchéité (37), et pour assurer une commutation avec compensation de la pression, la première surface d'extrémité (50) du piston de soupape (34) et la surface partielle disposée en face de celle-ci contre l'élément en forme de bille (35), qui est limitée par la deuxième arête d'étanchéité (37), présentant approximativement des surfaces actives de même taille, sur lesquelles s'applique la pression provenant de la source de carburant haute pression (2).
  2. Injecteur de carburant (1) selon la revendication 1, caractérisé en ce que le diamètre du piston de soupape (34) et le diamètre au niveau de la première arête d'étanchéité (36) présentent un rapport qui permet de presser l'élément en forme de bille (35) dans la position de repos avec une faible force de contact contre la première arête d'étanchéité (36).
  3. Injecteur de carburant (1) selon la revendication 1, caractérisé en ce que l'élément en forme de bille (35) est reçu dans l'espace de commande de soupape (30), les arêtes d'étanchéité (36, 37) étant réalisées dans le contour de l'espace de commande de soupape (30).
  4. Injecteur de carburant (1) selon la revendication 3, caractérisé en ce que l'élément en forme de bille (35) est reçu sans guidage dans l'espace de commande de soupape (30), et peut être centré de manière hermétique par le siège respectif dans les arêtes d'étanchéité (36, 37).
  5. Injecteur de carburant (1) selon les revendications 1 à 4, caractérisé en ce que l'espace de commande de soupape (30) présente un contour interne à symétrie radiale, de sorte que l'élément en forme de bille (35) forme contre les arêtes d'étanchéité (36, 37) un contact d'étanchéité annulaire respectif.
  6. Injecteur de carburant (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que l'espace de commande de soupape (30) est sollicité par la pression de la source de carburant haute pression (2), quand l'élément en forme de bille (35) réalise l'étanchéité dans la position de repos contre la première arête d'étanchéité (36), tandis que l'espace de commande de soupape (30) peut être détendu en pression par le biais d'un canal de reflux (38), quand l'élément en forme de bille (35) réalise l'étanchéité dans la position d'injection contre la deuxième arête d'étanchéité (37).
  7. Injecteur de carburant (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que le diamètre du piston de soupape (34) est inférieur au diamètre de la première arête d'étanchéité (36) et/ou le diamètre de la deuxième arête d'étanchéité (37) est inférieur au diamètre du piston de soupape (34).
  8. Injecteur de carburant (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément en forme de bille (35) se compose d'un matériau métallique ou céramique et/ou est réalisé sous forme de corps de palier à roulement standard.
  9. Injecteur de carburant (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que la forme géométrique du piston de soupape (34) est réalisée sous forme de corps de base cylindrique.
  10. Injecteur de carburant (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que celui-ci comprend un espace d'accouplement (49) hydraulique sollicité par la pression de la source de carburant haute pression (2), par le biais duquel l'actionneur piézoélectrique (43) est accouplé hydrauliquement à la première surface d'extrémité (50) du piston de soupape (34).
EP07728519A 2006-06-13 2007-04-25 Injecteur de carburant Not-in-force EP2032835B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006027330A DE102006027330A1 (de) 2006-06-13 2006-06-13 Kraftstoffinjektor
PCT/EP2007/054064 WO2007144226A1 (fr) 2006-06-13 2007-04-25 Injecteur de carburant

Publications (2)

Publication Number Publication Date
EP2032835A1 EP2032835A1 (fr) 2009-03-11
EP2032835B1 true EP2032835B1 (fr) 2010-10-13

Family

ID=38261661

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07728519A Not-in-force EP2032835B1 (fr) 2006-06-13 2007-04-25 Injecteur de carburant

Country Status (7)

Country Link
US (1) US7954475B2 (fr)
EP (1) EP2032835B1 (fr)
JP (1) JP5021731B2 (fr)
CN (1) CN101466946B (fr)
AT (1) ATE484671T1 (fr)
DE (2) DE102006027330A1 (fr)
WO (1) WO2007144226A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011079468A1 (de) * 2011-07-20 2013-01-24 Continental Automotive Gmbh Piezoinjektor
DE102012212614A1 (de) * 2012-07-18 2014-01-23 Continental Automotive Gmbh Piezoinjektor mit hydraulisch gekoppelter Düsennadelbewegung
DE102012222509A1 (de) 2012-12-07 2014-06-12 Continental Automotive Gmbh Piezoinjektor
DE102012223934B4 (de) 2012-12-20 2015-10-15 Continental Automotive Gmbh Piezoinjektor
DE102013200935A1 (de) * 2013-01-22 2014-07-24 Robert Bosch Gmbh Brennstoffeinspritzanlage mit einer Brennstoff führenden Komponente, einem Brennstoffeinspritzventil und einem Verbindungselement

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Publication number Priority date Publication date Assignee Title
US4182492A (en) * 1978-01-16 1980-01-08 Combustion Research & Technology, Inc. Hydraulically operated pressure amplification system for fuel injectors
US4462368A (en) * 1980-07-10 1984-07-31 Diesel Kiki Company, Ltd. Fuel injection system for internal combustion engine
JPH0350375A (ja) * 1989-07-19 1991-03-04 Nippondenso Co Ltd 蓄圧式燃料噴射弁の安全装置
JPH0828407A (ja) * 1994-07-11 1996-01-30 Unisia Jecs Corp フューエルインジェクタ
JPH10227268A (ja) * 1997-02-12 1998-08-25 Nippon Soken Inc 蓄圧式燃料噴射装置
DE19949528A1 (de) * 1999-10-14 2001-04-19 Bosch Gmbh Robert Doppelschaltendes Steuerventil für einen Injektor eines Kraftstoffeinspritzsystems für Brennkraftmaschinen mit hydraulischer Verstärkung des Aktors
JP4048699B2 (ja) * 1999-11-10 2008-02-20 株式会社デンソー 燃料噴射弁
DE10043625C2 (de) * 2000-09-05 2003-03-27 Bosch Gmbh Robert Hydraulisch übersetztes Ventil
FR2819022B1 (fr) * 2000-12-28 2006-06-02 Denso Corp Dispositif de commande hydraulique, systeme et procede de commande d'un dispositif actionneur
JP4125963B2 (ja) * 2001-05-17 2008-07-30 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング 燃料噴射装置
DE10131619A1 (de) 2001-06-29 2003-01-23 Bosch Gmbh Robert Kraftstoffinjektor mit Einspritzverlaufsformung
DE10162651A1 (de) * 2001-12-20 2003-09-04 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10207045A1 (de) * 2002-02-20 2003-08-28 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10211439A1 (de) * 2002-03-15 2003-10-02 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
JP3841054B2 (ja) * 2002-08-08 2006-11-01 株式会社デンソー フィルタおよびそれを用いた燃料噴射装置
DE10254749A1 (de) 2002-11-23 2004-06-17 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung mit einem 3/3-Wege-Steuerventil zur Einspritzverlaufsformung
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DE102004035455A1 (de) 2004-07-22 2006-02-16 Robert Bosch Gmbh Verfahren und Vorrichtung zum Betreiben einer Brennkraftmaschine

Also Published As

Publication number Publication date
ATE484671T1 (de) 2010-10-15
CN101466946A (zh) 2009-06-24
US7954475B2 (en) 2011-06-07
JP2009540204A (ja) 2009-11-19
CN101466946B (zh) 2011-05-25
DE502007005361D1 (de) 2010-11-25
JP5021731B2 (ja) 2012-09-12
WO2007144226A1 (fr) 2007-12-21
US20090266340A1 (en) 2009-10-29
EP2032835A1 (fr) 2009-03-11
DE102006027330A1 (de) 2007-12-20

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