EP4301976A1 - Injecteur amélioré - Google Patents

Injecteur amélioré

Info

Publication number
EP4301976A1
EP4301976A1 EP22712905.3A EP22712905A EP4301976A1 EP 4301976 A1 EP4301976 A1 EP 4301976A1 EP 22712905 A EP22712905 A EP 22712905A EP 4301976 A1 EP4301976 A1 EP 4301976A1
Authority
EP
European Patent Office
Prior art keywords
control valve
fluid
sleeve
pressure relief
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.)
Pending
Application number
EP22712905.3A
Other languages
German (de)
English (en)
Inventor
Jonghan HONG
Lee YUNSEOK
Juho CHUNG
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.)
Phinia Delphi Luxembourg SARL
Original Assignee
BorgWarner Luxembourg Operations SARL
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 BorgWarner Luxembourg Operations SARL filed Critical BorgWarner Luxembourg Operations SARL
Publication of EP4301976A1 publication Critical patent/EP4301976A1/fr
Pending 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
    • 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
    • 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
    • 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
    • F02M63/0071—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059 characterised by guiding or centering means in valves including the absence of any guiding means, e.g. "flying arrangements"
    • 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
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically

Definitions

  • the present invention concerns an improvement to injectors such as fuel injectors comprising a control valve having a stem moveable in a sleeve for circuit pressure operation.
  • the injector comprises an injector body, an injector nozzle and a movably mounted injector needle.
  • a spring is provided in a spring chamber for biasing the injector needle towards a seated position in which the nozzle holes are closed.
  • the injector comprises a control valve assembly for controlling the injector needle.
  • the control valve assembly comprises a control valve body and a control valve member mounted in a control chamber.
  • the control valve member comprises a guide barrel and a stem having a smaller diameter.
  • a sleeve 2 in which the stem 41 of the control valve member 4 may move axially is provided in a fluid chamber.
  • the sleeve 2 is held in the control valve body 1.
  • the sleeve is a fixed part to prevent deposit and contamination.
  • a fluid passage 11 in the control valve body provides fluid F in a chamber 3 and the sleeve 2 comprises two holes 5 to let the fluid enter a space 6 around the reduced diameter stem to allow said fluid to be extracted from said space 6 and escape through an upper passage 8 when the control valve member is lifted together with seal cap 7 in the direction A.
  • a control valve assembly for an injector comprising a control valve body housing a longitudinal tubular sleeve in which is received a reduced diameter stem of a control valve member which may move axially in a longitudinal direction between a fluid receiving position and a fluid expelling position, wherein said control valve body is provided with a fluid passage delivering fluid in a chamber around a medium part of said sleeve, wherein said sleeve comprises at least one fluid distribution hole within the chamber to let the fluid enter a space around the reduced diameter stem when said control valve member is in said fluid receiving position, characterized in that said sleeve comprises at least one pressure relief hole spaced in the longitudinal direction from the or each fluid distribution hole and from said space.
  • the sleeve may comprise two fluid distribution holes.
  • the sleeve may comprise two pressure relief holes spaced in the longitudinal direction from the or each fluid distribution hole and from said space.
  • the pressure relief hole(s) reduces pressure strain on the tubular sleeve and provides bending of such sleeve.
  • the cylindrical valve member may comprise a proximal part attached to a seal cap.
  • the cylindrical valve member may include an intermediate part comprising said reduced diameter stem and a distal part forming a guiding rod. Said pressure relief hole(s) may be located in front of said guiding rod.
  • the pressure relief hole(s) position may be optimized to avoid bending of the sleeve.
  • a size and location of said pressure relief hole(s) may be adapted to keep said pressure relief hole(s) in front of said guiding rod in both the fluid receiving position and the fluid expelling position of said control valve member.
  • a fluid path may be provided between at least one fluid distribution hole and at least one pressure relief hole on both sides of a tubular wall of said sleeve so that pressure is equilibrated on both sides of the sleeve wall.
  • a fluid path exits on opposing sides of the sleeve so that the pressure is equilibrated on both sides of the sleeve.
  • the invention also concerns an injector comprising a pressure control system provided with a control valve according to the invention.
  • the injector may be an electromechanical injector, said pressure control system comprising an electromechanical actuator for driving movements of said control valve.
  • Figure 1 A is a cut lateral view of an injector of the prior art
  • Figure 1b is a cut lateral view of a control valve assembly of an injector as in figure 1 A;
  • Figure 2A and 2B are cut lateral views of an embodiment of the present invention in a fluid receiving position and a fluid expelling position, respectively; and Figure 3 is an enlarged view of a detail of figure 2.
  • the present invention concerns injectors such as electromagnetically driven fuel injectors 100 used in common rail fuel injection systems as depicted in figure 1A.
  • Such injectors comprise an electromagnetic actuator 130 actuating a control valve member 4 of a valve 1 and comprise a nozzle 110 and a needle 120 for injecting fuel.
  • the regulation valve 4 is embedded in the injectors, and the valve controls communication between a high-pressure fuel passage and low-pressure fuel return line of the common rail system which in turn controls injection of fuel through the nozzle of the injector as described in EP 2 620 632 A1 .
  • an improved control valve as described in figure 2A comprising a control valve body 1 housing a longitudinal tubular sleeve 2.
  • the longitudinal direction is the vertical direction in the drawing and the electromechanical actuator 130 is above the control valve while the needle and nozzle system not shown are under the control valve in the injector.
  • the control valve comprises further a cylindrical valve member 4 which comprises a proximal part attached to a seal cap 7, an intermediate part comprising a reduced diameter stem 41 to form a fluid receiving space 6 and a distal part forming a guiding rod 42.
  • the control valve member may move axially in the longitudinal direction A between the fluid receiving position of figure 2A and the fluid expelling position of figure 2B. Fluid received in the space 6 around the reduced diameter stem 41 is expelled from such space in an upper passage as shown in figure 2B.
  • the tubular sleeve 2 houses part of the valve member 4 including the reduced diameter stem 41 of the control valve member 4 and provides a sidewall for the space 6 and fluid distribution holes 5a, 5b for the fluid to enter the space 6.
  • the control valve body 1 For feeding the control valve, the control valve body 1 is provided with a fluid passage 11 delivering fluid F in a chamber 3 around a medium or middle part of the tubular sleeve 2 and the fluid distribution holes 5a, 5b within the chamber 3 let the fluid enter the space 6 around the reduced diameter stem 41 when said control valve member is in the fluid receiving position.
  • the sleeve 2 comprises at least two pressure relief holes 9a, 9b spaced in the longitudinal direction from said fluid distribution holes 5a, 5b and from said space 6. These pressure relief holes 9a, 9b equilibrate pressure around the tubular wall of the sleeve 2 as shown on figure 3 where pressure P1 on the inner side of the sleeve 2 equilibrates pressure P2 on the outer side of the sleeve 2.
  • the pressure relief holes 9a, 9b are located in front of the guiding rod 42 and a size and location of the pressure relief holes 9a, 9b is adapted to keep said pressure relief holes in front of said guiding rod 42 in both the fluid receiving position and fluid expelling position of said control valve member 4.
  • a fluid path 10a, 10b is provided between at the fluid distribution holes 5a, 5b and the pressure relief holes 9a, 9b on both sides of the tubular wall of said sleeve 2.
  • Alternate designs may include one hole or more than two holes (i.e. not necessarily two pressure relief holes). This fluid path also improves lubrification between the sleeve 2 and the moving control valve member guiding rod 42 in addition to balancing the pressure on both sides of the sleeve wall.
  • the invention solves problems of potential deformation and deposit on the sleeve 2 with the additional pressure distribution path provided by the pressure relief holes 9a, 9b.
  • control valve body 1 longitudinal tubular sleeve 2 chamber 3
  • control valve member 4 fluid distribution holes 5a, 5b space 6 seal cap 7 upper passage 8 pressure relief holes 9a, 9b fluid path 10a, 10b fluid passage 11 reduced diameter stem 41 guiding rod 42 injector 100 nozzle 110 needle 120 electromechanical actuator 130

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)

Abstract

Ensemble soupape de commande pour un injecteur, comprenant un corps de soupape de commande (1) logeant un manchon tubulaire longitudinal (2) dans lequel est reçue une tige à diamètre réduit (41) d'un élément de soupape de commande (4) qui peut se déplacer axialement dans une direction longitudinale (A) entre une position de réception de fluide et une position d'expulsion de fluide, ledit corps de soupape de commande (1) étant pourvu d'un passage de fluide (11) distribuant du fluide (F) dans une chambre (3) autour d'une partie intermédiaire dudit manchon (2), ledit manchon comprenant au moins un trou de distribution de fluide (5a, 5b) à l'intérieur de la chambre (3) pour laisser le fluide entrer dans un espace (6) autour de la tige à diamètre réduit (41) lorsque ledit élément de soupape de commande est dans ladite position de réception de fluide, et ledit manchon comprenant au moins un trou de décharge de pression (9a, 9b) espacé dans la direction longitudinale à partir du ou de chaque trou de distribution de fluide (5a, 5b) et à partir dudit espace (6).
EP22712905.3A 2021-03-02 2022-03-02 Injecteur amélioré Pending EP4301976A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2102903.8A GB2604353B (en) 2021-03-02 2021-03-02 Improved Injector
PCT/EP2022/055300 WO2022184777A1 (fr) 2021-03-02 2022-03-02 Injecteur amélioré

Publications (1)

Publication Number Publication Date
EP4301976A1 true EP4301976A1 (fr) 2024-01-10

Family

ID=75377572

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22712905.3A Pending EP4301976A1 (fr) 2021-03-02 2022-03-02 Injecteur amélioré

Country Status (4)

Country Link
EP (1) EP4301976A1 (fr)
CN (1) CN118355187A (fr)
GB (1) GB2604353B (fr)
WO (1) WO2022184777A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2357263C2 (de) * 1973-11-16 1975-03-20 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzanlage für Brennkraftmaschinen
DE10046823B4 (de) * 2000-09-20 2004-07-15 L'orange Gmbh Servosteuerventil für Einspritzinjektoren
EP2940287A1 (fr) * 2014-05-01 2015-11-04 Delphi International Operations Luxembourg S.à r.l. Filtre d'injecteur de carburant
GB201411162D0 (en) * 2014-06-24 2014-08-06 Delphi International Operations Luxembourg S.�.R.L. Control valve

Also Published As

Publication number Publication date
GB2604353A (en) 2022-09-07
GB2604353B (en) 2024-05-29
GB202102903D0 (en) 2021-04-14
WO2022184777A1 (fr) 2022-09-09
CN118355187A (zh) 2024-07-16

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