EP3314114B1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP3314114B1
EP3314114B1 EP16718375.5A EP16718375A EP3314114B1 EP 3314114 B1 EP3314114 B1 EP 3314114B1 EP 16718375 A EP16718375 A EP 16718375A EP 3314114 B1 EP3314114 B1 EP 3314114B1
Authority
EP
European Patent Office
Prior art keywords
receiving body
fuel injector
region
extension
injector according
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
EP16718375.5A
Other languages
German (de)
English (en)
Other versions
EP3314114A1 (fr
Inventor
Thilo Rzymann
Helmut Clauss
Enis Erkan
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
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 EP3314114A1 publication Critical patent/EP3314114A1/fr
Application granted granted Critical
Publication of EP3314114B1 publication Critical patent/EP3314114B1/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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0036—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat with 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion

Definitions

  • the invention relates to a fuel injector according to the preamble of claim 1.
  • Such a fuel injector is from the DE 101 22 241 A1 the applicant known.
  • the known fuel injector has within a leakage oil space, via the pressure medium from a control chamber of the valve housing in a return region can be flowed off, designed as a valve ball valve member, which is partially positively received in a receiving body.
  • the valve member by means of an actuator, usually by means of a solenoid actuator, connected, which can move the valve ball from the drain hole closing position in an open position.
  • the fuel flows around the annular region between a conically shaped portion of the leakage oil space in the region of the valve ball and the valve ball or the receiving body.
  • the receiving body known from the cited document is therefore advantageously designed.
  • the disadvantage here is that the assembly of an existing from the valve ball or the valve member and the receiving body assembly in the leakage oil chamber of the fuel injector is difficult insofar as that by the conical configuration of the receiving body tilting of the receiving body is possible or favored.
  • the present invention seeks to further develop a fuel injector according to the preamble of claim 1 such that with continued favorable aerodynamic properties for the fuel flowing out of the drain hole increased tipping safety of the receiving body to be achieved.
  • a fuel injector with the characterizing features of claim 1, characterized in that of the concentrically formed outer surface of the receiving body radially to extends outside at least one extension, in the region of which the cross section of the receiving body is enlarged in a direction perpendicular to the longitudinal axis of the receiving body direction.
  • Such a design makes it possible, in particular, to increase the diameter or cross section of the receiving body in the conical region of the leakage oil space which is decisive for the tilting safety during assembly of the receiving body in the injector housing, without having a great negative influence on the fluidic properties of the receiving body.
  • the at least one extension causes in the region of the conical outer surface of the receiving body reinforcing or stiffening of the receiving area for the valve member, so that it is possible to immerse the valve member, in particular in the form of a valve ball, particularly deep into a correspondingly shaped receptacle of the receiving body allow.
  • a plurality, in particular four extensions are provided, which are arranged at uniform angular intervals from each other.
  • the receiving body has on the side facing away from the valve member a cylindrically shaped region, followed in the direction of the longitudinal axis on the valve member side facing the conical region followed, and that of at least one extension in an extending radially to the longitudinal axis of the receiving body has an extension which is aligned with the outer diameter of the cylindrical portion.
  • the at least one extension extends over the entire conical region of the receiving body.
  • the at least one extension is formed at least substantially triangular in cross section in the direction of the longitudinal axis of the receiving body. This means that the cross-sectional area of the extension increases in the longitudinal direction of the drain body in the direction of the side facing away from the drain hole.
  • the cross section of the at least one extension tapers towards a web edge in the direction of the end face of the receiving body facing the valve member.
  • a particularly secure or reliable installation of the valve member in the receiving body can be achieved if the receiving body has a spherical portion receptacle for the formed as a valve ball valve member, and if the depth of the recording viewed in the direction of the longitudinal axis between 30% and 50% of the diameter Valve ball amounts.
  • Such, with at least one, preferably a plurality of extensions formed receiving body represents from a manufacturing point of view, a relatively complex formed component that can not be produced for example by turning or grinding processes alone. It is therefore provided in a further preferred embodiment for the lowest possible possible production of the receiving body, that the receiving body is formed as a metal powder injection molded part.
  • the Indian Fig. 1 fuel injector 10 shown in detail serves in particular as part of a so-called common rail fuel injection system in self-igniting internal combustion engines for injecting fuel into the combustion chamber of the internal combustion engine.
  • the fuel injector 10 has an injector housing 11 in which a fuel supply hole 12 is formed.
  • the fuel supply hole 12 opens into a known, and therefore not shown, high-pressure chamber of the injector housing 11 in which a nozzle needle serving as an injection member is arranged to be liftable.
  • a fuel injector 10 is incidentally on the DE 101 22 241 A1 referred, which should be part of this application.
  • the nozzle needle is at least indirectly with a in the Fig. 1 recognizable element 15 which dips with a front end into a sleeve-shaped insert 16, wherein the insert 16 is in turn arranged radially in a receiving bore 17 of the valve housing 11 fixed, and wherein the element 15 is arranged to be liftable in the direction of the longitudinal axis 18.
  • a through hole 19 is formed, which opens into an outer control chamber 20.
  • the leakage oil chamber 30 has, on the side facing the drain hole 28, a conically shaped first region 31, which merges at least in regions into a cylindrical second region 32 on the side remote from the drain bore 28.
  • a magnet armature 35 which is shown only in sections, is arranged in a liftable manner.
  • the armature 35 is at least indirectly connected to a receiving body 38 which carries on the drain hole 28 side facing a valve member 39 in the form of a valve ball 40.
  • the valve ball 40 is inserted in the receptacle 42.
  • the receiving body 38 has on the side facing away from the valve member 39 on a cylindrically shaped first portion 43, which merges on the valve member 39 side facing in a conically shaped second portion 44.
  • the lateral surface of the second region 44 is provided with a cone angle ⁇ of at least 30 °, preferably at least 40 °, very particularly preferably about 45 ° to the longitudinal axis 18, in which the receiving body 38 is arranged to be liftable together with the valve member 39 by means of the magnet armature 35 ,
  • the flow cross-section for the fuel formed between the receiving body 38 and the first region 31 of the leakage oil chamber 30 increases in the direction of the magnet armature 35.
  • At least one extension 45 is arranged on the receiving body 38 on the outer surface of the conically shaped second region 44 of the receiving body 38.
  • the extension 45 together with the receiving body 38, formed by an integrally formed in the metal powder injection process component.
  • Fig. 3 It can be seen that, by way of example, four projections 45 are provided which are arranged at uniform angular intervals (in the illustrated embodiment thus offset by 90 ° from each other). Furthermore, it can be seen that the projections 45 viewed in the radial direction up to the range first (cylindrical) portion 43 of the receiving body 38 and viewed in side view radially aligned with the first portion 43. In addition, the extensions 45 extend over the entire axial extent of the second conical region 44, ie, up to the end face 41 of the receiving body 38 facing the valve member 39.
  • the extensions 45 are substantially triangular in shape, such that in the region of the peripheral surface 46 of the extensions 45, these have their greatest extent. At the level of the end face 41 of the second region 43, the extensions 45 have a web edge 47 running parallel to the end face 41.

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 (10)

  1. Injecteur de carburant (10) comprenant un boîtier d'injecteur (11) dans lequel est prévu un élément (15) disposé de manière à pouvoir être déplacé vers le haut et vers le bas pour l'injection au moins indirecte de carburant dans la chambre de combustion d'un moteur à combustion interne, l'élément (15) pénétrant dans un espace de commande (20) qui peut être déchargé en pression par le biais d'un alésage d'écoulement (28) dans un espace de fuite d'huile (30), l'alésage d'écoulement (28) pouvant être fermé du côté opposé à l'espace de commande (20) dans l'espace de fuite d'huile (30) au moyen d'un organe de soupape (39), l'organe de soupape (39) étant reçu par engagement par correspondance de formes en partie dans un corps de réception (38) disposé le long d'un axe longitudinal (18) de manière à pouvoir être déplacé vers le haut et vers le bas, l'espace de fuite d'huile (30) présentant, du côté tourné vers l'alésage d'écoulement (28), une région (31) réalisée sous forme conique, et le corps de réception (38) présentant, du côté tourné vers l'organe de soupape (39), une région (44) réalisée sous forme conique,
    caractérisé en ce
    qu'au moins une saillie (45) s'étend vers l'extérieur dans la direction radiale depuis la région (44) conique, dans la région de laquelle saillie la section transversale du corps de réception (38) est agrandie dans une direction s'étendant perpendiculairement à l'axe longitudinal (18).
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    l'angle de conicité (α) de la région (44) est supérieur à 30°.
  3. Injecteur de carburant selon la revendication 1 ou 2,
    caractérisé en ce que
    plusieurs, notamment quatre, saillies (45) sont prévues, lesquelles sont disposées de préférence à des intervalles angulaires réguliers les unes des autres.
  4. Injecteur de carburant selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce que
    le corps de réception (38) présente, du côté opposé à l'organe de soupape (39), une région (43) réalisée sous forme cylindrique se raccordant à la région (44) conique et en ce que l'au moins une saillie (45) présente, dans une direction s'étendant radialement par rapport à l'axe longitudinal (18), une étendue qui est alignée avec le diamètre de la région (43) cylindrique.
  5. Injecteur de carburant selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce que l'au moins une saillie (45),
    dans une direction s'étendant perpendiculairement à l'axe longitudinal (18) du côté tourné vers l'organe de soupape (39), se termine en affleurement avec le corps de réception (38).
  6. Injecteur de carburant selon l'une quelconque des revendications 1 à 5,
    caractérisé en ce que
    l'au moins une saillie (45), vu dans la direction de l'axe longitudinal (18), s'étend sur toute la région (44) conique.
  7. Injecteur de carburant selon l'une quelconque des revendications 1 à 6,
    caractérisé en ce que
    la section transversale de l'au moins une saillie (45) est réalisée essentiellement sous forme triangulaire dans une direction s'étendant perpendiculairement à l'axe longitudinal (18).
  8. Injecteur de carburant selon l'une quelconque des revendications 1 à 7,
    caractérisé en ce que
    la section transversale de l'au moins une saillie (45) se rétrécit vers une arête de nervure (47) dans la direction de la surface frontale (41) du corps de réception (38) tournée vers l'organe de soupape (39).
  9. Injecteur de carburant selon l'une quelconque des revendications 1 à 8,
    caractérisé en ce que
    le corps de réception (38) présente un logement (42) en forme de portion de sphère pour l'organe de soupape (39) réalisé sous forme de bille de soupape (40), et en ce que la profondeur (t) du logement (42) est comprise entre 30 % et 50 % du diamètre (D) de la bille de soupape (40).
  10. Injecteur de carburant selon l'une quelconque des revendications 1 à 9,
    caractérisé en ce que
    le corps de réception (38) est réalisé sous forme de pièce moulée par injection de poudre de métal (MIM) .
EP16718375.5A 2015-06-26 2016-04-26 Injecteur de carburant Active EP3314114B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015211918.1A DE102015211918A1 (de) 2015-06-26 2015-06-26 Kraftstoffinjektor
PCT/EP2016/059254 WO2016206834A1 (fr) 2015-06-26 2016-04-26 Injecteur de carburant

Publications (2)

Publication Number Publication Date
EP3314114A1 EP3314114A1 (fr) 2018-05-02
EP3314114B1 true EP3314114B1 (fr) 2019-07-17

Family

ID=55808613

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16718375.5A Active EP3314114B1 (fr) 2015-06-26 2016-04-26 Injecteur de carburant

Country Status (4)

Country Link
EP (1) EP3314114B1 (fr)
CN (1) CN107820538B (fr)
DE (1) DE102015211918A1 (fr)
WO (1) WO2016206834A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10122241A1 (de) * 2001-05-08 2002-12-05 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10250720A1 (de) * 2002-10-31 2004-05-13 Robert Bosch Gmbh Einspritzventil
DE102005053133A1 (de) * 2005-11-08 2007-05-10 Robert Bosch Gmbh Kavitationsoptimierter Kraftstoffinjektor
CN102808712B (zh) * 2012-07-17 2014-01-15 华中科技大学 一种直线电磁驱动柱塞泵
DE102012224226A1 (de) * 2012-12-21 2014-06-26 Robert Bosch Gmbh Kraftstoffinjektor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN107820538A (zh) 2018-03-20
EP3314114A1 (fr) 2018-05-02
DE102015211918A1 (de) 2016-12-29
CN107820538B (zh) 2020-05-19
WO2016206834A1 (fr) 2016-12-29

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