EP2439398B1 - Soupape d'injection de combustible - Google Patents

Soupape d'injection de combustible Download PDF

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Publication number
EP2439398B1
EP2439398B1 EP11190884.4A EP11190884A EP2439398B1 EP 2439398 B1 EP2439398 B1 EP 2439398B1 EP 11190884 A EP11190884 A EP 11190884A EP 2439398 B1 EP2439398 B1 EP 2439398B1
Authority
EP
European Patent Office
Prior art keywords
control chamber
nozzle
fuel injection
nozzle needle
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.)
Active
Application number
EP11190884.4A
Other languages
German (de)
English (en)
Other versions
EP2439398A1 (fr
Inventor
Jens Leister
Holger Rapp
Friedrich Howey
Cetin Irmak
Kasim-Melih Hamutcu
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
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Publication of EP2439398A1 publication Critical patent/EP2439398A1/fr
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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
    • 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
    • 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
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies

Definitions

  • the invention relates to a fuel injection valve with a switching valve arranged on the head side. Specifically, the invention relates to the field of injectors for fuel injection systems of air compressing, self-igniting internal combustion engines.
  • an injector for injecting a high-pressure fluid through a nozzle is known.
  • the known injector body comprises a high-pressure inlet line and a non-pressurized outlet.
  • the injector body contains a solenoid valve, which serves to control the nozzle.
  • an axially extending sleeve is movably received, whose one end face is actuated by means of a valve and the other end face defines a control chamber into which a branch of a high-pressure inlet opens.
  • the sleeve in the injector body has a clearance of more than 0.01 mm, the diameter of the bore in the axially extending sleeve in the range of 1.5 mm.
  • the sleeve is mounted approximately free of play and indeed with a clearance of less than 0.01 mm, which places very high demands on the concentricity and the machining quality of the sleeve component.
  • a fuel injection valve which has an outer nozzle needle and an inner nozzle needle guided therein, wherein the outer nozzle needle is guided in a control chamber limiting sleeve.
  • an injection valve is known in which the combustion chamber distal end of the single nozzle needle is accommodated in a sleeve.
  • Similar injectors are also off WO 2008/015039 A1 .
  • DE 103 46 212 A1 and DE 10149 961 A1 known.
  • the fuel injection valve according to the invention with the features of claim 1 has the advantage that the manufacturability, in particular with respect to a control chamber bore, is improved, wherein a head-side arrangement of the switching valve in the fuel injection valve is possible.
  • a control room tube is at least partially disposed in the control chamber bore, that the control room tube divides the control chamber bore into a control chamber surrounding the high-pressure part and a provided within the control room tube control chamber part, which forms the control chamber, and that the filler in the control chamber part of the control chamber bore is arranged.
  • the nozzle needle may be guided in the control room tube. It is also advantageous that the control chamber tube is acted upon by a nozzle spring, which is supported on the one hand on the control chamber tube and on the other hand on the nozzle needle.
  • the filler is at least partially configured rod-shaped and that the filler at least partially extends through the control chamber bore of the holding body.
  • the filler in the control chamber bore sections have a three- or polygonal cross-section, so that one or more retaining edges are formed.
  • the filler in the control chamber bore is axially displaceable. This has the advantage that pressure changes, which are generated by the switching valve for driving the nozzle needle, also or even substantially affect a displacement of the filler in the control chamber bore.
  • the diameter of the control chamber bore has a similar or the same size as the diameter of that part of the nozzle needle, which dips into the control chamber, wherein also the filler is arranged axially displaceable in the control chamber bore and not at rest at an upper stop located.
  • the filler moves analogously to the nozzle needle up and down, so that little or no Fuel from the nozzle side of the filler located portion of the control chamber in the control valve side part or vice versa must be spent.
  • throttle effects in the narrow gap between the inner wall of the control chamber bore and the filler and the pressure in the control chamber are also eliminated can largely be considered as uniform.
  • the filler can be inserted only in the control chamber bore, so that it remains axially displaceable therein.
  • a spring element is provided, that the filler has a paragraph that the filler abuts on his shoulder at a nozzle body side stage of the control chamber bore and that the spring element presses the filler against the nozzle body side stage.
  • the filler can be acted upon by the bias of the spring element in order to achieve an axial fixation of the filler.
  • the spring element can be supported on the end face of the nozzle needle, whereby in addition a loading of the nozzle needle is possible, which optionally exerts a restoring force on the nozzle needle.
  • a nozzle spring is provided, which is supported on the one hand at a stage of the control chamber bore and on the other hand at a shoulder of the filler, and that the nozzle spring presses the filler against the end face of the nozzle needle.
  • a plant of the filler can be achieved on the nozzle needle.
  • the nozzle spring can exert a restoring force on the nozzle needle for closing the fuel injection valve.
  • Fig. 1 shows a non-inventive fuel injection valve 1 in a schematic sectional view.
  • the fuel injection valve 1 can serve in particular as an injector for fuel injection systems of air-compressing, self-igniting internal combustion engines.
  • a preferred use of the fuel injection valve 1 is for a fuel injection system with a common rail, the diesel fuel under high pressure leads to a plurality of fuel injection valves 1.
  • the fuel injection valve 1 according to the invention is also suitable for other applications.
  • the fuel injection valve 1 has a multi-part valve housing 2, which in this embodiment comprises a nozzle body 3, a holding body 4 and a head-side housing part 5.
  • the nozzle body 3, the holding body 4 and the head-side housing part 5 are connected to each other in a suitable manner.
  • the holding body 4 is at least partially disposed in the mounted state within a bore of an internal combustion engine.
  • the head-side housing part 5 is arranged outside the bore, so that it can be made relatively large. This results in favorable installation conditions for components of the fuel injection valve 1, which are provided in the head-side housing part 5.
  • a switching valve 6 is arranged, which may have a magnetic actuator, a piezoelectric actuator or another actuator.
  • the valve housing 2 of the fuel injection valve 1 has a fuel inlet 7, which is connected for example to a common rail. From the fuel inlet 7 branches off a fuel channel 8, which is guided by the holding body 4 and opens into a further fuel channel 9 in the nozzle body 3. In the nozzle body 3, a fuel chamber 10 is formed, which is filled via the fuel channels 8, 9 in operation with fuel under high pressure.
  • the nozzle body 3 has a valve seat surface 11 which cooperates with a valve closing body 12 of a nozzle needle 13 arranged in the nozzle needle 13 to a sealing seat. When opening the nozzle needle 13 along an axis 14 of the sealing seat is released, so that fuel from the fuel chamber 10 via at least one nozzle opening 15 is hosed. The actuation of the nozzle needle 13 is described below in further detail.
  • the holding body 4 has a control space bore 20 which extends along the axis 14 substantially over the entire length of the holding body 4.
  • an inlet throttle 21 is provided at the head end of the control chamber bore 20, via the fuel from the fuel inlet 7 into the control chamber bore 20 can be guided.
  • an outlet throttle 22 is provided.
  • the outlet throttle 22 can be connected via the arranged in the head-side housing part 5 switching valve 6 with a fuel return 23, which leads to a tank 24. The connection is controllable via the switching valve 6.
  • the nozzle needle 13 has an end face 25 which defines a control chamber 26 together with the control chamber bore 20.
  • an inflow from the inlet throttle 21 and an outflow of fuel via the outlet throttle 22 is given in a head-side part 27 of the control chamber 26.
  • a filler 30 is arranged, which extends almost over the entire length of the control chamber bore 20. Between the control chamber bore 20 and the filler 30, an annular gap-shaped part 28 of the control chamber 26 is formed. Furthermore, the control chamber 26 has a nozzle-side part 29. Through the filler 30, the fuel-filled volume of the control chamber bore 20 is significantly reduced.
  • the filler 30 is formed of a solid, preferably a steel.
  • the filler 30 Since the compression modulus of steel is significantly greater than the compression modulus of diesel fuel or the like, the filler 30 does not contribute to the elasticity of the control space 26 practically. Thereby can be achieved without direct mechanical power transmission even with a relatively large spatial distance between the arranged in the head-side housing part 5 switching valve 6 and the nozzle body 3 arranged in the nozzle needle 13 a rigid connection of the nozzle needle 13 to the switching valve.
  • the pressure builds up in the head-side part 27 and thus also in the nozzle-side part 29 of the control chamber 26 again.
  • a closing force acts on the end face 25 of the nozzle needle 13 and is supported by the force of a nozzle spring 35 arranged in the nozzle-side part 29 of the control chamber 26.
  • the nozzle spring 35 also ensures an axial fixation of the filler piece 30.
  • the filler piece 30 has a shoulder 36 which rests against a nozzle-body-side step 37 of the control chamber bore 20.
  • the nozzle spring 35 presses the shoulder 36 against the nozzle body-side stage 37.
  • Fig. 2 shows the in Fig. 1 With II designated section of a non-inventive fuel injection valve.
  • the filler 30 has a head portion 39, on which a shoulder 36 is provided.
  • a nozzle spring 35 is located on the one hand on the nozzle body side step 37 of the control chamber bore 20 and on the other hand on the shoulder 36 of the head portion 39 of the filler 30 at.
  • the filler 30 is pressed with its head part 39 against the end face 25 of the nozzle needle 13.
  • the filler 30 is arranged axially displaceable, so that it follows the movement of the nozzle needle 13.
  • the nozzle spring 35 acts on the nozzle needle 13 in the direction of the valve seat surface 11.
  • the filler 30 at a be positioned lower stop, which is given in this example by the end face 25 of the nozzle needle 13.
  • Fig. 3 shows the in Fig. 1
  • the filling piece 30 has at least one section 40, in which at least one edge 41 is formed on the filling piece 30. With the edge 41, the filler 30 is pressed against the control chamber bore 20, so that a fixation of the filler 30 in the axial direction, that is along the axis 14, is given.
  • Fig. 4 shows the in Fig. 3 Section IV of the fuel injection valve 1.
  • the filler 30 has in the section 40 has a triangular cross section, so that the edges 41, 42, 43 are formed. In the region of the edges 41, 42, 43 while a press fit between the filler 30 and the control chamber bore is formed.
  • the section 40 can be configured, for example, by grinding on the filler 30.
  • Fig. 5 shows a fuel injection valve 1 according to the invention in a schematic sectional view.
  • a control room tube 50 is provided.
  • the control room tube 50 is arranged in the holding body 4 of the valve housing 2.
  • the control chamber tube 50 is inserted into the control chamber bore 20, the control chamber 50, the control chamber bore 50 in a surrounding the control chamber 50 high-pressure part 51, which is designed ringpaltförmig, and a provided within the control chamber tube 50 control chamber part divides, which forms the control chamber 26.
  • the filler 30 is arranged within the control space tube 50, that is, in the control chamber 26, the filler 30 is arranged.
  • the filler 30 is designed substantially rod-shaped and cylindrical.
  • the inlet throttle 21, via which high-pressure fuel can flow into the head-side part 27 of the control chamber 26, is in this embodiment in the region of the head-side part 27 in the control chamber tube 50 designed. This can be done for example by a hole in the control room tube 50.
  • the nozzle needle 13 has a pressure pin 52, with which the nozzle needle 13 is axially guided in the control chamber tube 50.
  • the pressure pin 52 is designed in one piece with the nozzle needle 13.
  • the nozzle spring 35 is placed on the pressure pin 52.
  • the nozzle spring 35 is supported, on the one hand, on the control space pipe 50 and, on the other hand, on the nozzle needle 13.
  • the pressure of the fuel in the control chamber 26 acts in the region of the nozzle-side part 29 of the control chamber 26 on the end face 25 of the nozzle needle 13, which is formed in this embodiment by the end face 25 of the pressure pin 52.

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 (5)

  1. Soupape d'injection de carburant (1), en particulier injecteur pour des installations d'injection de carburant de moteurs à combustion interne à auto-allumage et compression d'air, comprenant une soupape de commutation (6) qui est disposée dans une partie de boîtier (5) du côté de la culasse, un corps de buse (3) qui est connecté par le biais d'un corps de retenue (4) à la partie de boîtier (5) du côté de la culasse, et un pointeau de buse (13) disposé dans le corps de buse (3), le corps de retenue (4) présentant un alésage d'espace de commande (20), une face frontale (25) du pointeau de buse (13) limitant un espace de commande (26),
    un tube d'espace de commande (50) étant prévu, lequel est disposé au moins en partie dans l'alésage d'espace de commande (20), le tube d'espace de commande (50) divisant l'alésage d'espace de commande (20) en une partie haute pression (51) entourant le tube d'espace de commande (50) et une partie d'espace de commande prévue à l'intérieur du tube d'espace de commande (50), laquelle forme l'espace de commande (26), caractérisée en ce
    qu'une pièce de remplissage (30) est disposée dans l'espace de commande (26) et en ce que la pièce de remplissage (30) est disposée dans la partie d'espace de commande de l'alésage d'espace de commande (20), une partie en forme de fente annulaire (28) de l'espace de commande (26) étant formée entre la pièce de remplissage (30) et le tube d'espace de commande (50).
  2. Soupape d'injection de carburant selon la revendication 1, caractérisée en ce que la pièce de remplissage (30) est configurée au moins en partie en forme de barre et en ce que la pièce de remplissage (30) s'étend au moins en partie à travers l'alésage d'espace de commande (20) du corps de retenue (4).
  3. Soupape d'injection de carburant selon la revendication 1 ou 2, caractérisée en ce que la pièce de remplissage (30) peut être déplacée axialement dans l'alésage d'espace de commande (20).
  4. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 3, caractérisée en ce que le tube d'espace de commande (50) est sollicité par un ressort de buse (35) qui s'appuie d'une part contre le tube d'espace de commande (50) et d'autre part contre le pointeau de buse (13).
  5. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 3, caractérisée en ce que le pointeau de buse (13) est réalisé, dans sa région supérieure, avec un diamètre de guidage et en ce qu'il est guidé au niveau de cette région supérieure dans le tube d'espace de commande (50).
EP11190884.4A 2008-06-19 2009-04-22 Soupape d'injection de combustible Active EP2439398B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810002522 DE102008002522A1 (de) 2008-06-19 2008-06-19 Brennstoffeinspritzventil
EP09765666A EP2294308A1 (fr) 2008-06-19 2009-04-22 Injecteur de carburant

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP09765666.4 Division 2009-04-22
EP09765666A Division EP2294308A1 (fr) 2008-06-19 2009-04-22 Injecteur de carburant

Publications (2)

Publication Number Publication Date
EP2439398A1 EP2439398A1 (fr) 2012-04-11
EP2439398B1 true EP2439398B1 (fr) 2014-07-16

Family

ID=40908522

Family Applications (2)

Application Number Title Priority Date Filing Date
EP11190884.4A Active EP2439398B1 (fr) 2008-06-19 2009-04-22 Soupape d'injection de combustible
EP09765666A Withdrawn EP2294308A1 (fr) 2008-06-19 2009-04-22 Injecteur de carburant

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP09765666A Withdrawn EP2294308A1 (fr) 2008-06-19 2009-04-22 Injecteur de carburant

Country Status (3)

Country Link
EP (2) EP2439398B1 (fr)
DE (1) DE102008002522A1 (fr)
WO (1) WO2009153086A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010040316A1 (de) * 2010-09-07 2012-03-08 Robert Bosch Gmbh Kraftstoffinjektor
DE102015118691A1 (de) * 2015-11-02 2017-05-04 L'orange Gmbh Kraftstoff-Einspritzinjektor

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19706467C1 (de) * 1997-02-19 1998-03-26 Daimler Benz Ag Speichereinspritzsystem für eine mehrzylindrige Brennkraftmaschine
GB9820033D0 (en) * 1998-09-16 1998-11-04 Lucas Ind Plc Fuel injector
DE19939939A1 (de) * 1999-08-23 2001-04-19 Bosch Gmbh Robert Injektor für ein Common-Rail-Einspritzsystem für Brennkraftmaschinen mit kompakter Bauweise
DE19956522A1 (de) * 1999-11-24 2001-06-07 Bosch Gmbh Robert Injektor für unter Hochdruck erfolgender Kraftstoffeinspritzung
US6499467B1 (en) * 2000-03-31 2002-12-31 Cummins Inc. Closed nozzle fuel injector with improved controllabilty
DE10149961A1 (de) * 2001-10-10 2003-04-30 Bosch Gmbh Robert Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine, insbesondere Common-Rail-Injektor, sowie Kraftstoffsystem und Brennkraftmaschine
DE10346212A1 (de) * 2003-10-06 2005-04-21 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102004015746A1 (de) * 2004-03-31 2005-10-13 Robert Bosch Gmbh Kraftstoffeinspritzventil
DE102006036447A1 (de) * 2006-08-04 2008-02-07 Robert Bosch Gmbh Injektor für ein Kraftstoffeinspritzsystem

Also Published As

Publication number Publication date
EP2294308A1 (fr) 2011-03-16
EP2439398A1 (fr) 2012-04-11
DE102008002522A1 (de) 2009-12-24
WO2009153086A1 (fr) 2009-12-23

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