EP2473728B1 - Injecteur destine a l'injection de carburant - Google Patents

Injecteur destine a l'injection de carburant Download PDF

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Publication number
EP2473728B1
EP2473728B1 EP10736678.3A EP10736678A EP2473728B1 EP 2473728 B1 EP2473728 B1 EP 2473728B1 EP 10736678 A EP10736678 A EP 10736678A EP 2473728 B1 EP2473728 B1 EP 2473728B1
Authority
EP
European Patent Office
Prior art keywords
closing member
pin
section
compression spring
diameter
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.)
Active
Application number
EP10736678.3A
Other languages
German (de)
English (en)
Other versions
EP2473728A1 (fr
Inventor
Lorenz Zerle
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2473728A1 publication Critical patent/EP2473728A1/fr
Application granted granted Critical
Publication of EP2473728B1 publication Critical patent/EP2473728B1/fr
Active 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
    • 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
    • F02M63/0031—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
    • F02M63/007—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

Definitions

  • the invention relates to an injector for injecting fuel according to the preamble of claim 1.
  • Such an injector is from the DE 10 2006 021 741 A1 and DE 102 007 059 265 A1 known.
  • an anchor bolt is axially displaceably arranged in an armature, the diameter of which is significantly greater than the diameter of a drain hole connected to a control chamber.
  • the seat for sealing the drain hole is formed by the underside of the valve sleeve connected to the armature, which has a specially shaped annular seat edge, which is arranged at a certain distance from the drain hole.
  • the anchor bolt is surrounded by a compression spring, the magnet armature in Presses the direction of the seat and supported on an upper housing part, it may happen that the anchor bolt, which is also supported on the same area as the compression spring, comes into contact with the compression spring and thus limits or limits the mobility of the anchor bolt by the compression spring is. This can result in a leaking valve seat between the drain hole and the return hole.
  • the present invention seeks to further develop an injector for injecting fuel according to the preamble of claim 1 such that it is relatively inexpensive to produce, at the same time good sealing properties to be achieved at the valve seat.
  • the invention is based on the idea to increase the radial mobility of the anchor bolt at the support point in that the anchor bolt has an enlarged radial distance to the compression spring at this location to the compression spring. As a result, contacts of the anchor bolt are avoided with the compression spring in a critical area, so that the anchor bolt can be moved by the armature with relatively little effort, caused by the self-centering on the seat, radially or transversely.
  • the bolt-like element in the contact area on the support element has a section with a reduced diameter in relation to a pointing in the direction of the closing member section.
  • the section has a length of 30 to 80 percent, preferably 40 to 60 percent, of the region of the bolt-like element protruding from the closing element.
  • the diameter of the reduced-diameter portion is 60 to 90 percent, preferably 70 to 85 percent, of the diameter-unreduced portion.
  • a certain radial distance between the bolt-like element and the compression spring should be present.
  • the radial distance of the reduced diameter portion to the compression spring in the contact area is 5 to 20 percent, in particular 7.5 to 15 percent, of the diameter of the section.
  • the bolt-shaped element can be formed particularly cost-effectively if it is designed as a one-piece component.
  • a defined support surface of the compression spring can be achieved on the closing member, because the compression spring is supported on the closing member facing side on a support ring.
  • the required spring and magnetic forces for the closing member can be reduced if the bolt-like element on the side facing the valve seat and its adapted guide in the armature have a diameter corresponding to the diameter of the seat edge at the lower end of the armature.
  • the centering of the closing member at its seat is ensured when the closing member and the seat for centering are each cone-shaped.
  • an injector 1 for injecting fuel is shown in a combustion chamber, not shown, of an internal combustion engine of a motor vehicle.
  • a designed especially as a radial piston pump high-pressure pump 2 delivers fuel from a fuel reservoir 3 in a high-pressure fuel storage 4 (Rail).
  • the injector 1 is connected via other, not shown, injectors via a supply line 5.
  • the supply line 5 opens into a pressure chamber 6 which is bounded radially on the outside by an injector body 7.
  • a return line 8 a low-pressure region 9 of the injector 1 is connected to the fuel reservoir 3. Via the return line 8, a later to be explained control amount of fuel from the injector 1 to the fuel tank 3 flow.
  • valve element 10 is arranged, which extends in the axial direction into a formed as a blind hole receiving bore 11 of a nozzle body 12, which is clamped with a clamping nut 13 against the injector 7.
  • the valve element 10 is formed in two parts in the embodiment shown and consists of a control rod 14 and coupled thereto a nozzle needle 15.
  • the longitudinally displaceable both in a valve member 16 and in the nozzle body 12 guided valve member 10 has a closing surface 18 at a tip 18, with which the valve element 10 can be brought into close contact with a valve element seat 19 formed inside the nozzle body 12.
  • valve member 10 When the valve member 10 abuts the valve member seat 19, i. is in a closed position, the fuel outlet from a nozzle hole assembly 20 is locked within the nozzle body 12. If, on the other hand, it is lifted from the valve element seat 19, fuel can flow from the pressure chamber 6 through lateral flow connections 21 formed as transverse bores inside the nozzle body 12 on and past the valve element 10 to the nozzle hole arrangement 20 and standing there substantially under high pressure (rail pressure) into a combustion chamber be sprayed.
  • a control chamber 24 is limited, which is arranged radially within the pressure chamber 6, so that a guide gap 25 between the valve element 10 (control rod 14 ) and the sleeve-shaped portion 23 of the valve piece 16 can not expand.
  • the control chamber 24 is supplied from the pressure chamber 6 via an inlet throttle 26 running in the radial direction with the valve piece 16 with fuel under high pressure.
  • the control chamber 24 is connected via an opening in the valve member 16 extending in the axial direction flow restrictor 27 with a valve chamber 28 of a pressure-balanced in this embodiment in the axial direction control valve 29 (servo valve).
  • the control valve 29 has an axially adjustable valve sleeve 30, which is designed in one piece with an anchor plate 31.
  • the armature plate 31 is part of an electromagnetic actuator 32 and is disposed in the valve piece 16 with radial play. If electromagnets 33 of the electromagnetic actuator 32 energized, raises the armature plate 31 together with the valve sleeve 30 of hers formed on the valve piece 16, conical valve seat 34 and are so, as already mentioned, the fuel flow in the direction of the low pressure region 9 free.
  • a matched guide 38 is on the one hand provided, on the other hand, the valve seat 34 facing side of the valve sleeve 30 is conical.
  • an anchor bolt 35 is arranged axially displaceable, which seals the valve chamber 28 in the axial direction upwards.
  • a compression spring 36 formed as a closing spring, the valve sleeve 30 is acted upon in the direction of its valve seat 34 with spring force, so that a rapid closing of the control valve 29 is ensured after an interruption of the energization of the electromagnets 33.
  • the compression spring 36 is supported between an upper housing part 37 of the injector 1 serving as a support element and a support ring 39 surrounding the anchor bolt 35 in the region of the valve sleeve 30.
  • the integrally formed anchor bolt 35 has two sections 40, 41 with different diameters.
  • the one, the valve chamber 28 facing portion 40 in this case has a diameter which corresponds at least approximately to the diameter of the valve seat edge at the lower end of the valve sleeve 30 and has a larger diameter than the other portion 41.
  • the length of the reduced diameter portion 41 is 30% to 80%, preferably 40% to 60% of the length of the armature plate 31 and the valve sleeve 30 projecting portion of the anchor bolt 35th
  • the diameter of the section 41 is 60% to 80%, preferably 70% to 85% of the diameter of the section 40.
  • the radial distance R between the portion 41 and the compression spring 36, in particular in the contact region of the anchor bolt 35 and the compression spring 36 on the upper housing part 37 7.5% to 20%, in particular 10% to 15% of the diameter of section 41.
  • a closing spring 45 is arranged, which is supported on the one hand on the arranged inside the pressure chamber 6, sleeve-shaped portion 23 of the valve member 16 and on the other hand on a peripheral collar 46 of the valve element 10.
  • a compression spring 47 is supported, on the other hand rests on an upper end side of a coupler sleeve 48, and thus compresses the coupler sleeve 48 in the axial direction on an upper end face 49 of a guide portion 50.
  • a hydraulic coupler volume 51 is accommodated, in which the end faces 52, 53 of the control rod 14 and the nozzle needle 15 are opposite. The coupler volume 51 causes the nozzle needle 15 to follow an axial movement of the control rod 14.
  • the formed as part of the nozzle body 12 guide portion 50 is arranged at a radial distance from a peripheral wall 54 of the injector body 7, so that a circumferential gap 55 is formed directly radially between the guide portion 50 and the peripheral wall 54 of the injector body 7.
  • this circumferential gap 55 can be substantially narrower than in the drawing and serve as a centering for the nozzle body 12 relative to the injector body 7.
  • valve element 10 here: the nozzle needle 15
  • the valve element 10 is received axially displaceable.
  • the circumferential gap 55 is radially outside the guide portion 50 under high pressure (rail pressure) standing fuel, so that a widening of the guide gap 56 is prevented radially between the guide portion 50 and the valve member 10.
  • the flow connections 21 are provided within the nozzle body 12 in an axial portion of the nozzle body 12 directly adjacent to the guide portion 50 in the axial direction and also is arranged radially within the injector body 7, so that fuel from the ambient gap 55 can flow in the radial direction through the flow connections 21 and then in the axial direction to the nozzle hole assembly 20.
  • valve sleeve 30 and the anchor plate 31 are formed as separate components.
  • the increased radial distance to the compression spring 36 can be made in the region of the housing part 37 by a specially shaped compression spring, in which this has an enlarged coil diameter in the region of the housing part 37, which decreases in the direction of the valve sleeve 30.

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)

Claims (8)

  1. Injecteur (1) destiné à l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne, dans lequel un organe d'injection (10), qui libère ou ferme au moins une ouverture d'injection (20), est commandé par une soupape de commande (29), la soupape de commande (29) libérant ou fermant une connexion (43) entre un espace de commande (24) et un retour de carburant (8), en ce qu'un organe de fermeture (30) disposé en liaison fonctionnelle avec un ressort de compression (36) est placé dans un siège (34) ou libère celui-ci, et un élément de type boulon (35) étant disposé de manière déplaçable axialement dans l'organe de fermeture (30), lequel est entouré radialement par le ressort de compression (36) dans la région faisant saillie hors de l'organe de fermeture (30) et s'appuie sur le côté opposé au siège (34) conjointement avec le ressort de compression (36) contre un élément de support fixe (37), caractérisé en ce que
    l'organe de fermeture (30) est disposé avec un jeu radial par rapport à une pièce de soupape (16) et en ce que l'élément de type boulon (35) présente dans la région d'appui contre l'élément de support (37) une distance radiale accrue (R) au ressort de compression (36),
    en ce que l'élément de type boulon (35), dans la région d'appui contre l'élément de support (37), présente une portion (41) de diamètre réduit par comparaison avec une portion (40) tournée dans la direction de l'organe de fermeture (30) et
    en ce que le ressort de compression (36) s'appuie contre une bague de support (39) du côté tourné vers l'organe de fermeture (30), laquelle bague de support entoure la portion (40) de l'élément de type boulon (35) tournée dans la direction de l'organe de fermeture (30).
  2. Injecteur selon la revendication 1, caractérisé en ce que la portion (41) de diamètre réduit présente une longueur de 30 % à 80 %, de préférence de 40 % à 60 % de la région de l'élément de type boulon (35) faisant saillie hors de l'organe de fermeture (30).
  3. Injecteur selon la revendication 1 ou 2, caractérisé en ce que le diamètre de la portion (41) de diamètre réduit vaut 60 % à 90 %, de préférence 70 % à 85 % de la portion (40) de diamètre non réduit.
  4. Injecteur selon l'une quelconque des revendications 2 ou 3, caractérisé en ce que la distance radiale (R) de la portion (41) de diamètre réduit au ressort de compression (36) dans la région d'appui contre l'élément de support (37) vaut 5 % à 20 %, notamment 7,5 % à 15 % du diamètre de la portion (41) de diamètre réduit.
  5. Injecteur selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'élément de type boulon (35) est réalisé d'une seule pièce.
  6. Injecteur selon l'une quelconque des revendications 1 à 5, caractérisé en ce que l'élément de type boulon (35) présente dans la région du siège (34) un diamètre qui correspond au diamètre de l'arête du siège au niveau de la région inférieure de l'organe de fermeture (30).
  7. Injecteur selon l'une quelconque des revendications 1 à 6, caractérisé en ce que l'organe de fermeture (30) et le siège (34) sont réalisés à chaque fois sous forme conique en vue du centrage.
  8. Injecteur selon l'une quelconque des revendications 1 à 7, caractérisé en ce que l'organe de fermeture (30) fait partie d'une armature (31) qui coopère avec un agencement de bobine (33).
EP10736678.3A 2009-08-31 2010-07-21 Injecteur destine a l'injection de carburant Active EP2473728B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910029009 DE102009029009A1 (de) 2009-08-31 2009-08-31 Injektor zum Einspritzen von Kraftstoff
PCT/EP2010/060542 WO2011023473A1 (fr) 2009-08-31 2010-07-21 Injecteur servant à injecter du carburant

Publications (2)

Publication Number Publication Date
EP2473728A1 EP2473728A1 (fr) 2012-07-11
EP2473728B1 true EP2473728B1 (fr) 2014-11-26

Family

ID=42668207

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10736678.3A Active EP2473728B1 (fr) 2009-08-31 2010-07-21 Injecteur destine a l'injection de carburant

Country Status (3)

Country Link
EP (1) EP2473728B1 (fr)
DE (1) DE102009029009A1 (fr)
WO (1) WO2011023473A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011078564A1 (de) * 2011-07-04 2013-01-10 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor und Kraftstoffinjektor
DE102013211855A1 (de) * 2013-06-21 2014-12-24 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor
GB201513309D0 (en) 2015-07-29 2015-09-09 Delphi Int Operations Lux Srl Fuel injector

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006021741A1 (de) 2006-05-10 2007-11-15 Robert Bosch Gmbh Kraftstoffinjektor mit druckausgeglichenem Steuerventil
DE102007047152A1 (de) * 2007-10-02 2009-04-09 Robert Bosch Gmbh Injektor mit einem Ringraum getrennten Ankerraum
DE102007059265A1 (de) * 2007-12-10 2009-06-18 Robert Bosch Gmbh Schaltventil für Injektoren
DE102008003348A1 (de) * 2008-01-07 2009-07-09 Robert Bosch Gmbh Kraftstoffinjektor
DE102008041531A1 (de) * 2008-08-25 2010-03-04 Robert Bosch Gmbh Verfahren zum Betreiben einer Einspritzvorrichtung für eine Brennkraftmaschine

Also Published As

Publication number Publication date
EP2473728A1 (fr) 2012-07-11
DE102009029009A1 (de) 2011-03-03
WO2011023473A1 (fr) 2011-03-03

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