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WO2010081576A1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
WO2010081576A1
WO2010081576A1 PCT/EP2009/065436 EP2009065436W WO2010081576A1 WO 2010081576 A1 WO2010081576 A1 WO 2010081576A1 EP 2009065436 W EP2009065436 W EP 2009065436W WO 2010081576 A1 WO2010081576 A1 WO 2010081576A1
Authority
WO
WIPO (PCT)
Prior art keywords
control valve
valve element
fuel
control
chamber
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.)
Ceased
Application number
PCT/EP2009/065436
Other languages
German (de)
English (en)
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 WO2010081576A1 publication Critical patent/WO2010081576A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • 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
    • 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

Definitions

  • the invention relates to a fuel injector, in particular a common rail injector, for injecting fuel into a combustion chamber of an internal combustion engine, according to the preamble of claim 1.
  • the object of the invention is to propose a fuel injector with a control valve which is of simple design and with which short injection valve element closing times can be realized.
  • the control valve should preferably be suitable for integration in common rail injectors in use.
  • control valve element as 3/2
  • 3/2-way valve trained control valve is characterized according to the invention by two sealing surfaces for cooperation with a respective control valve seat, wherein the sealing surfaces are arranged on two opposite end faces of the control valve element.
  • Such an arrangement of the sealing surfaces makes it possible, if necessary, to realize a control valve which is axially compressible, at least approximately, preferably completely, pressure-balanced, and which can be used at fuel pressures of more than 1800 bar.
  • a fuel injector is proposed with a control valve designed as a 3/2-way valve whose sealing faces are remote from each other for interaction with a control valve seat, thereby achieving shorter shift times and improved dynamics over standard fuel injectors.
  • control valve does not necessarily have to-be designed as a control valve that is pressure-balanced in the axial direction, at least approximately, preferably completely.
  • the advantage of, at least approximately, pressure balance in the axial direction is that overall the forces acting on the control valve element forces are minimized, whereby smaller closing springs and smaller actuators, in particular electromagnetic actuators, can be used, wherein an embodiment with piezoelectric actuator can be realized.
  • the only approximately pressure balance in the axial direction can be realized, for example, that the diameter of the first sealing surface, at least approximately, the diameter of the second sealing surface corresponds or in that the diameter of the first control valve seat corresponds to the diameter of the second control valve seat, and it is particularly preferred is, if the sealing surface diameter additionally correspond to a guide diameter of the control valve element, with which the control valve element at its
  • the first end face of the control valve element having the first sealing surface is arranged on a side facing the one- or multi-part injection valve element, pointing in the axial direction, and consequently avoids the second end face of the injection valve element is.
  • the injection valve element may alternatively be formed in one or more parts.
  • the combination of a control rod with a nozzle needle is preferred, wherein the control rod more preferably immediately frontally limits the control chamber in the axial direction.
  • control valve as a 3/2 way valve makes it possible to provide a backfilling channel in addition to the inlet valve supplying the control chamber permanently with fuel under high pressure, via which the control chamber can be backfilled in one of the two switch positions of the control valve element. Preferably flows through the backfilling channel in the direction
  • Control chamber flowing fuel through the outlet throttle, through which force substance can flow to the Injektor Weglaufan gleich in located in the other switching position control valve element.
  • control valve element is penetrated by a flow channel through which fuel in the first switching position of the control valve can flow to an injector return port.
  • the hydraulic connection to the injector return connection is preferably interrupted in the second switching position.
  • the control valve releases a hydraulic connection between the backfilling channel and the control chamber in the second switching position.
  • the backfill channel preferably opens into a valve chamber, which in the first switch position is hydraulically separated from an outlet throttle that opens out of the control chamber, through which fuel in the second switch position can flow out of the valve chamber into the control chamber.
  • Particularly expedient is an embodiment in which the drainage channel is arranged centrally within the control valve in order to achieve a symmetrical loading of the control valve element.
  • the flow channel located within the control valve element is aligned in the axial direction with the outlet throttle through which fuel, preferably in the first switching position of the control valve, can flow out of the control chamber into the drainage channel.
  • an electromagnetic Actuator is provided which preferably cooperates with a fixedly connected to the control valve member or integrally formed therewith anchor plate.
  • the electric actuator is arranged such that the control valve element when energized in the direction of the injection valve element, ie in the direction of a nozzle hole arrangement, by the fuel when open
  • Injection valve element can flow into the combustion chamber, is adjusted.
  • Fig. 1 is a schematic, sectional view of a fuel injector with a pressure-balanced in the axial direction, as
  • Fig. 1 designed as a common rail injector fuel injector 1 is shown for injecting fuel into a combustion chamber, not shown, of a likewise not shown internal combustion engine of a motor vehicle.
  • a high-pressure pump 2 delivers fuel from a reservoir 3 in a high-pressure fuel storage 4 (Rail). In this fuel, especially diesel or gasoline, under high pressure, of about 2000 bar in this embodiment, stored.
  • the fuel injector 1 is connected, among other injectors, not shown, via a supply line 5.
  • the supply line 5 opens into a supply channel 6, which in turn opens into a pressure chamber 7 (high pressure area).
  • the fuel flowing into the pressure chamber 7 flows in an injection process directly into the combustion chamber of the internal combustion engine.
  • the fuel injector 1 is connected to a return line 9 via an injector return port 8.
  • an injection valve element 1 1 is arranged within an injector body 10.
  • the injection valve element 1 1 has at its tip 13 a closing surface 14 (sealing surface), with which the injection valve element 1 1 can be brought into a tight contact with an injection valve element seat 15 formed inside the nozzle body 12.
  • a closing surface 14 closing surface
  • the injection valve element 1 1 When the injection valve element 1 1 is applied to its injection valve element seat 15, i. is in a closed position, the fuel outlet from a nozzle hole arrangement 16 is locked. If, on the other hand, it is lifted off its injection valve element seat 15, fuel can flow out of the pressure chamber 7 into an annular space 17 formed radially between the injection valve element 11 and the nozzle body 12, past the injection valve element seat 15 to the nozzle hole arrangement 16 and there substantially under high pressure (rail pressure). be sprayed standing in the combustion chamber.
  • Section 19 of a throttle plate 20, a control chamber 21 is limited, which is supplied via a radially extending into the sleeve-shaped portion 19 of the throttle plate 20 inlet throttle 22 with fuel under high pressure from the pressure chamber 7.
  • the sleeve-shaped section 19 with the control chamber 21 enclosed therein is located radially outward from under high pressure
  • the control chamber 21 is concentric with the longitudinal central axis 24 of the
  • Fuel injector 1 extending, a drain throttle 25 having channel 26 connected to a valve chamber 27.
  • the valve chamber 27 is a valve chamber 27 of a control valve 28, by means of which the control chamber 21 can be hydraulically connected to the injector return port 8.
  • In the valve chamber 27 also opens a rinse tank 29, which connects the pressure chamber 7 hydraulically with the valve chamber 27.
  • control valve 28 is a 3/2-way valve whose sleeve-shaped control valve element 30 is axially adjustable between a lower, first switching position and an upper, second switching position shown.
  • the control valve element 30 In the second switching position shown, the control valve element 30 abuts with a second sealing surface 31 against a second control valve seat 32.
  • the second sealing surface 31 is arranged on a second end face 33, remote from the injection valve element 11, of the control valve element 30.
  • the second control valve seat 32 is located on a cover surface 34 of a trough-shaped insert member 35, which is clamped by a clamping nut 36 in the axial direction in the drawing plane down against a guide member 37, which in turn is clamped against the throttle plate 20, on an inner annular shoulder 38th the injector body 10 rests.
  • a hydraulic connection between the control chamber 21 and the injector return port 8 is interrupted in the second switching position shown.
  • a hydraulic connection between the rinse pump 29 and the control chamber 21 is released so that fuel can flow through the rinse bath 27 and the channel 26 with outlet throttle 25 in the control chamber 21 and thus can provide for faster refilling.
  • control valve member 30 abuts with a first, lower sealing surface 39 at a first Steuerven- tilsitz 40, which is formed on the throttle plate 20 and within the
  • Valve chamber 27 is located.
  • the first sealing surface 39 is located on a first end face 41 of the control valve element 30, which faces the injection valve element 1 1.
  • fuel can flow (centric) around the valve chamber 27 directly into a flow channel 42 extending axially within the control valve element 30, which is arranged coaxially to the longitudinal central axis 24 and is aligned with the channel 26 in the axial direction , flow to the second control valve seat 32 and between the second sealing surface 31 and the second control valve seat 32 in an armature plate chamber 43 (low pressure area) and from there via an axial passage 44 to the injector return port 8.
  • the discharge channel 42 opens in a trained within the control valve element 30 chamber 45, whose upper diameter corresponds to the diameter of the second sealing surface 31.
  • the diameter of the first sealing surface 39 corresponds to the diameter of the second sealing surface 31, wherein the sealing surface diameter again correspond to the diameter of the control valve element 30 in a guide portion 46, in which the control valve member 30 is guided at its outer periphery in a central bore 47 of the guide member 37 is.
  • the control valve 28 is pressure-balanced in both switching positions in the axial direction. If the sealing surface diameters deviate slightly from one another, the control valve element 30 is only approximately pressure balanced and has a closing or opening pressure step. In the event that the sealing surface diameters differ greatly, it can not be said that there is an axial pressure balance.
  • an electromagnetic actuator 48 with coil 52 is provided for adjusting the control valve element 30.
  • the electromagnetic actuator 48 is located in a region axially between an integrally formed with the control valve element 30 armature plate 49 and the injection valve element 1 1.
  • a closing spring 50 is supported, extending in the axial direction into a region radially between the actuator 48 and a bore 47 having extension 51 of the guide member 37 continues.
  • the closing spring 50 is supported on the guide part 37 on the side facing away from the armature plate 49 and acts on the control valve element 30 with a spring force in a direction away from the injection valve element 11 on the second control valve seat 32.
  • the coil 52 of the actuator 48 is energized, whereby the control valve member 30 is adjusted towards the injection valve element 1 1.
  • the electromagnetic actuator 48 is energized, so that the control valve element 30 is on the first control valve seat 40, ie in the first switching position, adjusted.
  • fuel can flow via the channel 26, through the outlet throttle 25 and the central outlet channel 42 to the injector return port 8.
  • the cross sections of the outlet throttle 25 and the inlet throttle 22 are matched to one another in such a way that a net Outflow of fuel (control amount) from the control chamber 21 results, with the result that the injection valve element 1 1 lifts from its injection valve element seat 15 and fuel can flow into the combustion chamber.
  • the energization of the electromagnetic actuator 48 is interrupted.
  • the control valve element 30 is adjusted by the spring force of the closing spring 50 in the second switching position, ie to the second control valve seat 32, so that the fuel through the drain passage 42 only into the chamber 45, but not on to the injector return port 8 can flow.
  • the hydraulic connection between the backfill channel 29 via the valve chamber 27 and the channel 26 is released into the control chamber 21, so that it is simultaneously refilled via the inlet throttle 22 and the scaffoldhellkanal 29, with the result that the fuel pressure in the control chamber 21 rapidly rises and the injection valve element 1 1 is moved back on its injection valve element seat 15, whereby the nozzle hole assembly 16 is closed.
  • Fig. 1 In the fuel-injector design shown in Fig. 1 is a so-called coaxial structure.
  • An embodiment is also conceivable in which the control valve 28 is displaced, i. is not arranged coaxially to the longitudinal central axis 24.
  • both control valve seats 40, 32 are designed as flat seats.
  • other known per se seat shapes such as ball seats, inner cone or outer conical seats can be realized.

Landscapes

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

Abstract

L'invention concerne un injecteur de carburant (1), notamment un injecteur à rampe commune, destiné à injecter du carburant dans une chambre de combustion d'un moteur à combustion interne, comprenant un élément de soupape d'injection (11) pouvant être déplacé en fonction de la pression du carburant dans une chambre de commande (21) entre une position de fermeture et une position d'ouverture libérant l'écoulement de carburant dans la chambre de combustion et une soupape de commande (28) associée à la chambre de commande (21) et comportant un élément de soupape de commande (30) pourvu d'une première surface d'étanchéité (39) disposée sur une première face frontale (41) pour coopérer avec un premier siège de soupape de commande (40). Selon l'invention, il est prévu que la soupape de commande (28) soit conçue comme un distributeur 3/2 et que l'élément (30) de la soupape de commande (28) comporte, sur une deuxième face frontale (18) opposée à la première face frontale (41), une deuxième surface d'étanchéité (31) pour coopérer avec un deuxième siège de soupape de commande (32).
PCT/EP2009/065436 2009-01-19 2009-11-19 Injecteur de carburant Ceased WO2010081576A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009000300.2 2009-01-19
DE200910000300 DE102009000300A1 (de) 2009-01-19 2009-01-19 Kraftstoff-Injektor

Publications (1)

Publication Number Publication Date
WO2010081576A1 true WO2010081576A1 (fr) 2010-07-22

Family

ID=42060919

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/065436 Ceased WO2010081576A1 (fr) 2009-01-19 2009-11-19 Injecteur de carburant

Country Status (2)

Country Link
DE (1) DE102009000300A1 (fr)
WO (1) WO2010081576A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010030429A1 (de) 2010-06-23 2011-12-29 Robert Bosch Gmbh Injektor, insbesondere Common-Rail-Injektor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10326257A1 (de) * 2003-06-11 2005-01-05 Robert Bosch Gmbh Ventil zum Steuern von Flüssigkeiten
DE102006036446A1 (de) * 2006-08-04 2008-02-07 Robert Bosch Gmbh Injektor für ein Kraftstoffeinspritzsystem
DE102006060593A1 (de) * 2006-12-21 2008-06-26 Robert Bosch Gmbh Kraftstoffinjektor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10326257A1 (de) * 2003-06-11 2005-01-05 Robert Bosch Gmbh Ventil zum Steuern von Flüssigkeiten
DE102006036446A1 (de) * 2006-08-04 2008-02-07 Robert Bosch Gmbh Injektor für ein Kraftstoffeinspritzsystem
DE102006060593A1 (de) * 2006-12-21 2008-06-26 Robert Bosch Gmbh Kraftstoffinjektor

Also Published As

Publication number Publication date
DE102009000300A1 (de) 2010-07-22

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